Liquid cooling plate of battery pack and battery pack

Abstract

The embodiment of the utility model relates to the technical field of energy storage, and provides a liquid cooling plate of a battery pack and the battery pack, the liquid cooling plate comprises a flow channel plate and a first drainage plate, the flow channel plate is internally provided with a plurality of first flow channels and a plurality of second flow channels, the plurality of first flow channels are communicated with the plurality of second flow channels, the plurality of first flow channels and the plurality of second flow channels are arranged side by side, and the first flow channels are communicated with the plurality of second flow channels. And the two groups are alternately arranged along the side-by-side arrangement direction. Through the arrangement of the first drainage plate, the third flow channel is formed between the first drainage plate and the flow channel plate, parallel arrangement of the multiple first flow channels can be achieved through the third flow channel, parallel arrangement of the multiple first flow channels does not need to be achieved through multiple pipelines, and therefore the number of the pipelines can be reduced, and complex pipeline connection is avoided; therefore, the structural complexity of the liquid cooling plate is effectively reduced, the volume of the liquid cooling plate can be effectively reduced, and the practicability of the liquid cooling plate is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a liquid cooling plate for a battery pack and the battery pack itself. Background Technology

[0002] In related technologies, battery packs suffer from uneven heat dissipation among multiple cells due to poorly designed bottom cooling plates. This results in poor temperature uniformity among the cells, leading to safety issues and an increased risk of thermal runaway in some cells. While some bottom cooling plates in related technologies have been developed to improve heat dissipation across multiple cells, their overly complex structures limit their practicality. Utility Model Content

[0003] Embodiments of this application provide a liquid cooling plate for a battery pack and a battery pack to solve the problems of complex liquid cooling plates and low practicality.

[0004] In a first aspect, embodiments of this application provide a liquid cooling plate for a battery pack. The liquid cooling plate includes a flow channel plate and a first guide plate. The flow channel plate has a first type of flow channel and a second type of flow channel. The first type of flow channel and the second type of flow channel are connected and arranged side by side, alternating in the side-by-side arrangement direction. The flow directions of the first type of flow channel and the second type of flow channel are opposite, and the flow direction is the flow direction of the coolant in the flow channel. The first type of flow channel includes multiple first flow channels, and the second type of flow channel includes multiple second flow channels. The multiple first flow channels and the multiple second flow channels are arranged alternately in the side-by-side arrangement direction. The liquid cooling plate also includes a first guide plate, which is disposed on the outer surface of the flow channel plate and forms a third flow channel between the outer surface of the flow channel plate and the outer surface of the flow channel plate. The third flow channel is used to communicate with the liquid inlet or outlet of the liquid cooling plate. The third flow channel extends in the side-by-side arrangement direction, so that the extension direction of the third flow channel is approximately perpendicular to the side-by-side arrangement direction of the multiple first flow channels. The outer surface of the flow channel plate is provided with multiple first through holes, which are used to connect the third flow channel and the first type of flow channel within the flow guide plate. The first type of flow channel includes multiple first flow channels corresponding to the multiple first through holes, thereby connecting the multiple first flow channels to the third flow channel through the multiple first through holes. In this embodiment, due to the setting of the first flow guide plate, the multiple first flow channels can be connected to the liquid inlet or outlet of the liquid cooling plate through the third flow channel. That is, the parallel setting of multiple first flow channels can be realized through the first flow guide plate, without the need for multiple pipes to connect the multiple first flow channels to the liquid inlet or outlet separately. This reduces the number of pipes used to realize the parallel connection of multiple first flow channels, thereby effectively reducing the complexity of pipe connections and the difficulty of connecting multiple first flow channels to the liquid inlet or outlet, thus reducing the structural complexity of the liquid cooling plate, simplifying the structure of the liquid cooling plate, facilitating the miniaturization of the liquid cooling plate, and thus effectively improving the practicality of the liquid cooling plate.

[0005] Furthermore, in this embodiment, by alternating the arrangement of the first type of flow channel and the second type of flow channel, the battery cell that contacts the liquid cooling plate can contact both the first type of flow channel and the second type of flow channel, rather than only contacting one of the first type of flow channel or the second type of flow channel. The coolant in the first type of flow channel and the second type of flow channel is usually of different sizes, so when the battery cell that can contact both the first type of flow channel and the second type of flow channel can effectively improve the temperature uniformity of each battery cell and prevent some battery cells from not being able to dissipate heat effectively.

[0006] In some embodiments, the first guide plate and the flow channel plate are stacked in the thickness direction of the flow channel plate, and multiple first through holes are disposed on the outer surface of the flow channel plate in the thickness direction. Because the first guide plate and the flow channel plate are stacked, their connection can be facilitated. Since the first guide plate is disposed on the outer surface of the flow channel plate in the thickness direction, and the multiple first through holes are also disposed on the outer surface of the flow channel plate in the thickness direction, communication between the multiple first through holes and the third flow channel can be facilitated, which helps to simplify the structure of the liquid cooling plate.

[0007] In some embodiments, multiple first through holes face multiple first flow channels in the thickness direction, and multiple first through holes face a third flow channel in the thickness direction. Because multiple first through holes face multiple first flow channels and multiple first through holes face a third flow channel in the thickness direction, the design complexity of the multiple first through holes can be reduced. For example, the multiple first through holes can be designed as simple straight holes, thus enabling communication between the multiple first flow channels and the third flow channel, making the structural design of the liquid cooling plate simple and reasonable.

[0008] In some embodiments, the first guide plate is fastened to the outer surface of the flow channel plate, and the first guide plate and the outer surface of the flow channel plate together form a third flow channel. Since the third flow channel is formed by the first guide plate and the flow channel plate, for example, by slotting the surface of the first guide plate facing the flow channel plate, and then sealing the slot with the outer surface of the flow channel plate to form the third flow channel, or by slotting the outer surface of the flow channel plate, and then sealing the slot with the first guide plate to form the third flow channel, since one of the first guide plate and the flow channel plate acts as a cover, the overall thickness of the first guide plate after it is fastened to the guide plate can be effectively reduced.

[0009] In some embodiments, the surface of the first guide plate facing the flow channel plate has a groove. The liquid cooling plate also includes a cover plate stacked between the outer surface of the flow channel plate and the first guide plate. The cover plate closes the groove on the first guide plate and forms a third flow channel. The cover plate has multiple second through holes, which are aligned with the multiple first through holes in the thickness direction. In this embodiment, by adding a cover plate to seal the groove on the first guide plate to form a third flow channel, and then connecting and fixing the cover plate to the flow channel plate, the sealing difficulty of the third flow channel is reduced when the surface of the flow channel plate is uneven. Moreover, the connection surface between the cover plate and the flow channel plate does not need to be sealed, which also reduces the connection difficulty between the cover plate and the flow channel plate.

[0010] In some embodiments, a fourth flow channel is also provided within the flow channel plate. The fourth flow channel extends along a parallel arrangement direction. Multiple second flow channels, including the second type of flow channel, are all connected to the fourth flow channel. The third flow channel is used to connect to one of the liquid inlet or outlet of the liquid cooling plate, and the fourth flow channel is used to connect to the other of the liquid inlet or outlet. In this embodiment, because multiple first through holes connect the third flow channel and multiple first flow channels, and the fourth flow channel connects to multiple second flow channels, and the multiple first flow channels and multiple second flow channels are also connected, and the third and fourth flow channels are respectively connected to the liquid inlet and the liquid outlet, a complete flow path for the coolant in the liquid cooling plate is formed. Moreover, the parallel arrangement of multiple first flow channels is achieved through the third flow channel, and the parallel arrangement of multiple second flow channels is achieved through the fourth flow channel, thereby improving the temperature uniformity of the coolant in the multiple first flow channels or the temperature uniformity of the coolant in the multiple second flow channels. In addition, the fourth flow channel is located inside the flow channel plate, which can make full use of the flow channel plate itself to effectively reduce the number of components of the liquid cooling plate. Moreover, since the extension direction of the fourth flow channel is consistent with the side-by-side arrangement direction of multiple first flow channels and multiple second flow channels, the connection between multiple second flow channels and the fourth flow channel can be easily realized with a simple flow channel structure.

[0011] In some embodiments, the first guide plate has a first assembly hole and a second assembly hole. The first assembly hole communicates with the third flow channel, and the second assembly hole communicates with the fourth flow channel. The first assembly hole is used to connect one of the liquid inlet and the liquid outlet, and the second assembly hole is used to connect the other of the liquid inlet and the liquid outlet. In this embodiment, since both the first assembly hole and the second assembly hole are located on the first guide plate to connect the liquid inlet and the liquid outlet, the structure of the flow channel plate can be simplified, the sealing difficulty of the flow channel plate can be reduced, and thus the processing difficulty of the flow channel plate can be reduced.

[0012] In some embodiments, a first assembly hole is formed on the first guide plate, which communicates with the third flow channel and is used to connect one of the liquid inlet and the liquid outlet. The liquid cooling plate also includes a second guide plate, which is disposed on the outer surface of the flow channel plate. The second guide plate has a second assembly hole, which communicates with the fourth flow channel and is used to connect the other of the liquid inlet and the liquid outlet. In this embodiment, by providing a first assembly hole on the first guide plate and a second assembly hole on the second guide plate, the positions of the first and second assembly holes are decoupled, increasing the flexibility in the design of the liquid inlet and the liquid outlet positions.

[0013] In some embodiments, the second guide plate and the flow channel plate are stacked in the thickness direction of the flow channel plate, and a third through hole communicating with the fourth flow channel is also formed on the outer surface of the flow channel plate. The second assembly hole communicates with the third through hole. Since the second guide plate and the flow channel plate are stacked in the thickness direction, and the third through hole is formed on the outer surface of the flow channel plate, it is convenient to align the positions of the second assembly hole and the third through hole on the second guide plate and to facilitate communication between the two, thus reducing the structural design difficulty of the liquid cooling plate.

[0014] In some embodiments, the second and first guide plates are located on opposite sides of the flow channel plate. In this embodiment, since the first and second guide plates are located on opposite sides of the flow channel plate in the thickness direction, the flexibility of the installation positions of the inlet and outlet can be improved to suit more installation scenarios.

[0015] In some embodiments, a fifth flow channel is further provided within the flow channel plate. The fifth flow channel extends along a side-by-side arrangement direction, and multiple first flow channels and multiple second flow channels are located between the fourth and fifth flow channels. All of the multiple first and multiple second flow channels extend to communicate with the fifth flow channel. In this embodiment, since all of the multiple first and multiple second flow channels extend to communicate with the fifth flow channel, the coolant first converges from the multiple first flow channels to the fifth flow channel, and then flows out from the fifth flow channel to the multiple second flow channels, or the coolant first converges from the multiple second flow channels to the fifth flow channel, and then flows out from the fifth flow channel to the multiple first flow channels. Because the coolant first converges to the fifth flow channel and then flows out, the temperature uniformity of the coolant in the latter half of the entire path can be effectively improved. Furthermore, in this embodiment, by setting the third, fourth, and fifth flow channels, multiple first flow channels and multiple second flow channels are connected in parallel, which can greatly reduce the length of the flow path of the coolant from the inflow into the liquid cooling plate to the outflow from the liquid cooling plate. The longer the path, the worse the heat dissipation effect of the coolant in the later part of the path on the battery cell. Thus, the liquid cooling plate in this embodiment can effectively improve the heat dissipation and cooling effect on the battery cell by reducing the path length.

[0016] In some embodiments, in the flow channel direction, the fourth flow channel is located on one side of the first type of flow channel, and multiple first through holes are located at one end of the multiple first flow channels facing the fourth flow channel. Since the multiple first through holes are located at one end of the multiple first flow channels facing the fourth flow channel, that is, the positions of the multiple first flow channels for communicating with the third flow channel are located at the ends, it can effectively prevent the coolant from not flowing sufficiently in a certain section of the multiple first flow channels, so that the coolant in that part cannot effectively participate in the heat dissipation of the battery cell.

[0017] In some embodiments, the flow channel plate includes a base plate and a substrate stacked together. The surface of the base plate facing the substrate has multiple first grooves and multiple second grooves, which are alternately arranged in a side-by-side direction. The substrate closes the multiple first grooves to form multiple first flow channels, and the substrate closes the multiple second grooves to form multiple second flow channels. A first guide plate is located on the side of the substrate away from the base plate, and multiple first through holes are formed on the substrate. Since the first and second grooves are located on the base plate, the flatness of the base plate surface is affected. In this embodiment, by placing the first guide plate on the side of the substrate away from the flow channel plate, and given the high flatness of the substrate, the sealing performance of the first guide plate and the substrate can be effectively guaranteed when connected, thus effectively reducing the connection difficulty between the first guide plate and the substrate.

[0018] In some embodiments, the flow channel plate has a plurality of first partitions and at least three second partitions on the side facing the substrate. The plurality of first partitions extend along the length direction of the liquid cooling plate, and the at least three second partitions extend along the width direction of the liquid cooling plate. The plurality of first partitions are spaced apart along the width direction, and a groove is formed between any two adjacent first partitions. The at least three second partitions are spaced apart along the width direction. The plurality of second partitions are located on one side of the plurality of first partitions in the length direction. Each second partition is connected to at least two first partitions and blocks one end of at least one flow channel. The groove blocked by the second partitions is the first groove, and the remaining grooves are the second grooves. In this embodiment, a second groove is formed by adjacent first partitions, with both ends of the groove not blocked in the extending direction. A first groove is formed by adjacent first partitions and a second partition connected to one end of the first partition. One end of the first groove in the extending direction is blocked by the second partition. The unblocked ends of both the first and second grooves communicate with the fifth flow channel, while the other end of the second groove communicates with the fourth flow channel. The end of the first groove facing the fourth flow channel is not connected to the fourth flow channel. Since each second partition is connected to at least two first partitions, when a second partition is connected to two first partitions, the formed first groove has second grooves on both sides in the alternating direction. When a second partition is connected to three first partitions, two adjacent first grooves are formed, with second grooves on both sides in the alternating direction. When a second partition is connected to four first partitions, three adjacent first grooves are formed, and so on.

[0019] In some embodiments, the multiple first flow channels and multiple second flow channels are arranged alternately in the manner of ABAB…, AABBB…, or ABBABB… These arrangement methods are all alternating arrangements of the multiple first flow channels and multiple second flow channels protected in this embodiment. Of course, in addition to these, the multiple first flow channels and multiple second flow channels can also be arranged alternately in other ways.

[0020] In some embodiments, the liquid cooling plate further includes multiple protrusions, which are disposed within multiple first flow channels within a first type of flow channel or multiple second flow channels within a second type of flow channel. The multiple protrusions are spaced apart along the extending direction of the first or second flow channels. By setting multiple protrusions, a turbulence effect can be achieved on the coolant located within the first or second flow channels, thereby improving the heat dissipation effect on the battery cell.

[0021] Secondly, embodiments of this application also provide a battery pack, which includes multiple battery cells and a liquid cooling plate as described in any of the first aspects above. The multiple battery cells are disposed on a flow channel plate, and each battery cell is directly aligned with the first type of flow channel and the second type of flow channel in the thickness direction. Because each battery cell is directly aligned with the first type of flow channel and the second type of flow channel in the thickness direction, each battery cell can be effectively cooled, improving the temperature uniformity of the multiple battery cells and reducing the probability of thermal runaway of the battery pack.

[0022] In some embodiments, the multiple cells include multiple rows of cells arranged side-by-side along a parallel arrangement direction, with multiple cells in each row arranged along a flow channel direction. This arrangement method not only simplifies and facilitates arrangement but also ensures that each cell can contact both the first and second type of flow channels, thereby improving the temperature uniformity of the multiple cells and reducing the probability of thermal runaway in the battery pack. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 An embodiment provides a schematic diagram of the battery pack structure;

[0025] Figure 2A for Figure 1 A schematic diagram showing the positional distribution of the liquid cooling plate and multiple battery cells in the embodiment;

[0026] Figure 2B A simplified schematic diagram of the arrangement of the first and second flow channels in another flow channel plate in this application embodiment;

[0027] Figure 2CA simplified schematic diagram of the arrangement of the first and second flow channels in another flow channel plate in this application embodiment;

[0028] Figure 3 for Figure 1 A schematic diagram of the liquid cooling plate in the embodiment;

[0029] Figure 4 for Figure 3 An exploded view of the liquid cooling plate in the embodiment;

[0030] Figure 5 An exploded view of another liquid cooling plate provided in an embodiment of this application;

[0031] Figure 6 An exploded view of another liquid cooling plate provided in an embodiment of this application;

[0032] Figure 7 An exploded view of another liquid cooling plate provided in an embodiment of this application;

[0033] Figure 8 An exploded view of another liquid cooling plate provided in an embodiment of this application;

[0034] Figure 9 This is an exploded view of another liquid cooling plate provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Battery pack; 2. Housing; 3. Liquid cooling plate; 4. Battery cell;

[0037] 10. Flow channel plate; 11. Base plate; 111. First groove; 112. Second groove; 113. First partition plate; 114. Second partition plate; 115. Fourth groove; 116. Third partition plate; 117. Fifth groove; 12. Base plate; 13. Type I flow channel; 14. Type II flow channel;

[0038] 101. First flow channel; 102. Second flow channel; 103. First through hole; 104. Fourth flow channel; 105. Third through hole; 106. Fifth flow channel; 107. Fifth through hole;

[0039] 20. First flow guide plate; 201. Third flow channel; 202. First assembly hole; 203. Second assembly hole; 21. Groove;

[0040] 31. Water inlet; 32. Water outlet;

[0041] 40. Cover plate; 401. Second through hole; 402. Fourth through hole;

[0042] 50. Second flow guide plate; 501. Second assembly hole; 502. Fourth flow channel;

[0043] 60. Bump. Detailed Implementation

[0044] The following section will first explain some of the terms used in the embodiments of this application.

[0045] The terms "first," "second," "third," "fourth," etc., used 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 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.

[0046] In this specification, the terms "vertical" and "parallel" are explained.

[0047] 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.

[0048] 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.

[0049] Modern society is filled with a vast array of devices that rely on electricity, from small household appliances to large data centers and factory production lines. Electricity supply is a crucial factor in maintaining the normal operation of modern society. Therefore, energy storage devices have developed rapidly and are widely used. These devices can be energy storage cabinets using battery packs, power cabinets in data centers, and even vehicles using battery packs. Energy storage devices can be used to store electrical energy and supply power to equipment that requires electricity. Applications include site energy, photovoltaics, residential energy storage, industrial and commercial energy storage, and large-scale ground-mounted power plant energy storage.

[0050] With the development of energy storage devices, safety has become paramount. As the core component of energy storage devices, the safety performance of the battery pack determines the overall safety performance of the device. However, some battery packs in related technologies typically have a large number of cells. Due to unreasonable structural design, poor heat dissipation and temperature uniformity among the cells can lead to thermal runaway in some cells, ultimately causing thermal runaway of the entire battery pack.

[0051] To improve battery pack safety, refer to Figure 1 , Figure 1 This embodiment provides a schematic diagram of a battery pack 1. The battery pack 1 includes a liquid cooling plate 3, which is part of the housing 2 of the battery pack 1. The liquid cooling plate 3 supports multiple battery cells 4 and dissipates heat from the multiple battery cells 4 located on the liquid cooling plate 3. This embodiment, through a reasonable design of the liquid cooling plate 3, ensures that all multiple battery cells 4 located on the liquid cooling plate 3 can receive sufficient heat dissipation, improves the temperature uniformity of the multiple battery cells 4 located on the liquid cooling plate 3, reduces the probability of thermal runaway of the battery cells 4, and thus improves the safety of the battery pack 1.

[0052] Figure 2A for Figure 1 A schematic diagram showing the positional distribution of the liquid cooling plate 3 and the multiple battery cells 4 in the embodiment. Figure 2A And the following text Figure 2B and Figure 2C These are all schematic diagrams taken from a top-down perspective.

[0053] Reference Figure 2A Liquid cooling plate 3 (refer to) Figure 1 The device includes a flow channel plate 10, on which multiple battery cells 4 are disposed. The flow channel plate 10 has a first type of flow channel 13 and a second type of flow channel 14. The first type of flow channel 13 and the second type of flow channel 14 are interconnected. For example, the coolant can flow out through the first type of flow channel 13 and then flow into the second type of flow channel 14, that is, the first type of flow channel 13 is located upstream of the second type of flow channel 14, or the coolant can flow out through the second type of flow channel 14 and then flow into the first type of flow channel 13, that is, the first type of flow channel 13 is located downstream of the second type of flow channel 14.

[0054] Taking the example where the coolant first flows through the first type of flow channel 13 and then through the second type of flow channel 14, that is, the first type of flow channel 13 is located upstream of the second type of flow channel 14, it is understandable that if the battery cell 4 is only in contact with the second type of flow channel 14, for example, if the battery cell 4 is only located above the second type of flow channel 14, and the coolant has to pass through the first type of flow channel 13 before passing through the second type of flow channel 14, heat exchange will occur between the coolant and the battery cell 4 when passing through the first type of flow channel 13. This will cause the temperature of the coolant to rise when it flows into the second type of flow channel 14, making it impossible to effectively dissipate heat from the battery cell 4 on the second type of flow channel 14, thus posing a risk of thermal runaway of the battery cell 4.

[0055] In order to ensure that each cell can be effectively cooled, refer to Figure 2A The first type of flow channel 13 and the second type of flow channel 14 are arranged side by side, and the first type of flow channel 13 and the second type of flow channel 14 are arranged alternately in the side-by-side direction. The flow directions of the first type of flow channel 13 and the second type of flow channel 14 are opposite, which is also the flow direction of the coolant. That is, the flow direction of the flow channel is approximately perpendicular to the side-by-side arrangement direction. In other words, when the coolant flows from the first type of flow channel 13 to the second type of flow channel 14, the flow direction of the coolant needs to be changed. For ease of description, the X direction will be used to represent the flow direction, and the Y direction will be used to represent the side-by-side arrangement direction of the first type of flow channel 13 and the second type of flow channel 14.

[0056] It is understandable that the first type of flow channel 13 and the second type of flow channel 14 can be roughly straight or wavy with a certain curvature. Of course, as long as the flow direction of the first type of flow channel 13 and the second type of flow channel 14 is roughly from the liquid cooling plate 3 (refer to...), they can be... Figure 1 It can be extended from one end to the other along its length.

[0057] Specifically, refer to Figure 2AThe second type of flow channel 14 includes multiple second flow channels 102 disposed within the flow channel plate 10, and the first type of flow channel 13 includes multiple first flow channels 101 disposed within the flow channel plate 10. The multiple second flow channels 102 and the multiple first flow channels 101 are arranged side by side in the Y direction, and the multiple second flow channels 102 and the multiple first flow channels 101 are arranged alternately in the Y direction. Because the multiple second flow channels 102 and the multiple first flow channels 101 are arranged alternately in this embodiment, the multiple first flow channels 101 in this embodiment can be arranged in parallel, so that the coolant can flow to the multiple first flow channels 101 approximately simultaneously, so that the temperature of the coolant in the multiple first flow channels 101 is approximately the same. The multiple second flow channels 102 can also be arranged in parallel, so that the coolant delivered to the flow channel plate 10 can be delivered to the multiple second flow channels 102 approximately simultaneously, so that the temperature of the coolant in the multiple second flow channels 102 is approximately the same. This ensures that any one of the multiple battery cells 4 disposed on the flow channel plate 10 can simultaneously be directly aligned with both the first flow channel 101 and the second flow channel 102 in the thickness direction of the liquid cooling plate. This avoids some battery cells 4 only being in direct contact with the second flow channel 102 in the thickness direction of the liquid cooling plate, thus preventing some battery cells 4 from failing to receive effective heat dissipation. Consequently, this effectively improves the temperature uniformity of the multiple battery cells 4 in the battery pack 1 and reduces the risk of thermal runaway. It is understood that in this application, "battery cell 4 being directly aligned with the first flow channel 101 or the second flow channel 102 in the thickness direction of the liquid cooling plate" means that the projections of the battery cell 4 and the first flow channel 101 or the second flow channel 102 in the thickness direction of the liquid cooling plate at least partially overlap. For ease of description, the Z-direction will be used in the following text to represent the thickness direction of the liquid cooling plate, which is also the height direction of the battery pack.

[0058] It is understandable that the alternating arrangement of multiple second flow channels 102 and multiple first flow channels 101 can refer to the second flow channels 102 and the first flow channels 101 being arranged in an ABAB... manner (e.g., ...). Figure 2A ) or in the form of ABBBAA... (e.g.) Figure 2B ) or in the manner of ABBABBA... (e.g.) Figure 2C Alternating arrangement of cells 102 and 101. As long as each cell 4 is aligned with at least one second flow channel 102 and one first flow channel 101, it is acceptable.

[0059] Reference Figure 2A In some embodiments, the multiple second flow channels 102 and the multiple first flow channels 101 are arranged alternately in the direction of the battery pack 1 (see reference). Figure 1The width direction of the flow channel plate 10 is the same as the width direction of the liquid cooling plate 3 and the width direction of the flow channel plate 10. The flow direction of the multiple second flow channels 102 and the multiple first flow channels 101, that is, the extension direction of the second flow channels 102 and the multiple first flow channels 101, is consistent with the length direction of the flow channel plate 10, which is also consistent with the length direction of the liquid cooling plate 3 and the length direction of the battery pack 1. It should be noted that... Figure 2B and attached Figure 2C Different flow channels are represented by different filling methods. For example, the first flow channel 101, the second flow channel 102, the fourth flow channel 104 and the fifth flow channel 106 are distinguished by different filling methods.

[0060] Reference Figure 2A In some embodiments, the plurality of battery cells 4 includes multiple rows of battery cells 4, which are arranged side by side along the Y direction, and the plurality of battery cells 4 in each row are arranged along the liquid cooling plate 3 (see reference). Figure 1 The liquid cooling plate 3 is arranged along its length, with both the second flow channel 102 and the first flow channel 101 extending along the length of the liquid cooling plate 3. It should be noted that the length of the liquid cooling plate 3 is parallel to that of the battery pack 1 (refer to...). Figure 1 The length direction of the cells is consistent. Arranging multiple cells 4 in the manner described in this embodiment not only facilitates the arrangement of multiple cells 4, but also ensures that the area ratio of the second flow channel 102 and the first flow channel 101 in contact with each cell 4 is approximately the same, thereby effectively improving the temperature uniformity among different cells 4.

[0061] To achieve parallel configuration of multiple second flow channels 102 or multiple first flow channels 101, related technologies connect multiple second flow channels 102 to a main pipe via multiple pipes to achieve parallel configuration. Similarly, multiple first flow channels 101 are connected to a main pipe via multiple pipes to achieve parallel configuration. However, the above methods result in a complex liquid cooling plate 3 with a large volume and significant space occupation.

[0062] Figure 3 for Figure 1 A schematic diagram of the liquid cooling plate 3 in this embodiment. The liquid cooling plate 3 in this embodiment is not only simple in structure and small in size, but also allows for the parallel connection of multiple second flow channels 102, or the parallel connection of multiple first flow channels 101. (Refer to...) Figure 3 The liquid cooling plate 3 also includes a first flow guide plate 20, and the first flow guide plate 20 and the flow channel plate 10 are stacked.

[0063] The first diversion plate 20 and the flow channel plate 10 can be connected together by means of bonding, welding, riveting or screwing.

[0064] A third flow channel 201 is formed between the first guide plate 20 and the flow channel plate 10. For example, the third flow channel 201 can be formed by the first guide plate 20 and the flow channel plate 10 enclosing each other. For example, a groove is opened on the first guide plate 20, and the third flow channel 201 is formed by the flow channel plate 10 covering the groove. Alternatively, a groove is opened on the flow channel plate 10, and the third flow channel 201 is formed by the first guide plate 20 covering the groove. Or, grooves can be opened on both the first guide plate 20 and the flow channel plate 10 at the same time, and the third flow channel 201 is formed after the first guide plate 20 and the flow channel plate 10 are stacked.

[0065] The third flow channel 201 extends along the Y direction, while multiple second flow channels 102 and multiple first flow channels 101 extend along the X direction. This allows the third flow channel 201 to correspond to multiple first flow channels 101 simultaneously, so that multiple first flow channels 101 can be connected in parallel through the third flow channel 201.

[0066] Figure 3 In this embodiment, the liquid cooling plate 3, due to the stacking of the first guide plate 20 and the flow channel plate 10 in the Z direction, forms a third flow channel 201, which can simultaneously connect with multiple first flow channels 101, thereby achieving parallel connection of multiple first flow channels 101. In this embodiment, the parallel connection of multiple first flow channels 101 can be achieved solely through the arrangement of the first guide plate 20, without the need for multiple pipes to connect multiple first flow channels 101 to the main pipeline, thus effectively simplifying the structure of the liquid cooling plate 3 and facilitating its miniaturization design.

[0067] Figure 4 for Figure 3 An exploded view of the liquid cooling plate 3 in this embodiment. The third flow channel 201 in this embodiment is connected to multiple first flow channels 101.

[0068] To achieve the connection between the third flow channel 201 and multiple first flow channels 101, refer to Figure 4In some embodiments, the flow channel plate 10 has multiple first through holes 103, which respectively connect multiple first flow channels 101 to a third flow channel 201. Since the multiple first through holes 103 are formed on the flow channel plate 10, it facilitates the connection between the multiple first through holes 103 and the multiple first flow channels 101. A first guide plate 20 covers the multiple first through holes 103 to facilitate the connection between the multiple first through holes 103 and the third flow channel 201. The first guide plate 20 is directly opposite the multiple first flow channels 101 in the Z direction to facilitate the connection between the multiple first through holes 103 and the multiple first flow channels 101, thereby realizing the connection between the third flow channel 201 and the multiple first flow channels 101, so that the multiple first flow channels 101 are arranged in parallel. Since the first guide plate 20 is directly opposite to multiple first through holes 103 and multiple first flow channels 101 in the Z direction, there is no need to connect the first through holes 103 and the third flow channel 201 through additional pipes. This simplifies the connection between the third flow channel 201 and the first through holes 103, effectively reducing the structural complexity of the liquid cooling plate 3. It can be understood that "the first guide plate 20 is directly opposite to multiple first through holes 103 or multiple first flow channels 101 in the Z direction" means that the projections of the first guide plate 20 and the multiple first through holes 103 or multiple first flow channels 101 overlap in the Z direction.

[0069] Reference Figure 4 In some embodiments, in the Z-direction, a plurality of first through holes 103 are directly opposite to a plurality of first flow channels 101. Specifically, each first flow channel 101 has a directly opposite first through hole 103 in the Z-direction, so that each first flow channel 101 can communicate with the third flow channel 201 through the first through hole 103. In the Z-direction, the plurality of first through holes 103 are directly opposite to the plurality of first flow channels 101 and the third flow channel 201. Since the plurality of first through holes 103 are directly opposite to the plurality of first flow channels 101 and the third flow channel 201, the plurality of first through holes 103 can be designed as straight holes in the Z-direction, which simplifies the design of the first through holes 103 and reduces the design difficulty of the first through holes 103. It is understood that the first through hole 103 being directly opposite to the first flow channel 101 in the Z-direction means that the projections of the first through hole 103 and the first flow channel 101 overlap in the Z-direction.

[0070] Reference Figure 4 In some embodiments, multiple first through holes 103 are arranged at intervals along the Y direction, and the spacing between the multiple first through holes 103 is consistent with the spacing between the multiple first flow channels 101. The extension direction of the third flow channel 201 is also in the Y direction, so the first guide plate 20 can be designed as a simple strip plate to facilitate the connection between the third flow channel 201 and the multiple first through holes 103, thereby making the design of the liquid cooling plate 3 more rational.

[0071] It is understandable that the flow rate of the third flow channel 201 is greater than that of the first flow channel 101, so that when the coolant in the third flow channel 201 is branched and flows to multiple first flow channels 101, the flow rate of the coolant in the first flow channel 101 can still be large enough to fully dissipate heat from the battery cell 4.

[0072] To facilitate the processing and manufacturing of the flow channels within the flow channel plate 10, refer to Figure 4 In some embodiments, the flow channel plate 10 includes a base plate 11 and a substrate 12 stacked in the Z direction. In the Z direction, the base plate 11 is located below the substrate 12, and the substrate 12 is used to directly support multiple battery cells 4 of the battery pack 1 (e.g., ...). Figure 2A The substrate 12 is generally flat, that is, the substrate 12 faces the housing 2 (e.g., Figure 1 The inner surface of the inner cavity and the outer surface facing away from the inner cavity of the housing 2 are both approximately planar, which allows for close contact with the battery cell 4 and improves the heat dissipation effect of the battery cell 4. It is understood that in some other embodiments, the substrate 12 faces the housing 2 (e.g., Figure 1 The inner surface of the cavity and the outer surface of the cavity away from the shell can also be curved surfaces.

[0073] A plurality of first grooves 111 and a plurality of second grooves 112 are formed on the surface of the base plate 11 facing the substrate 12. After the substrate 12 is stacked on the base plate 11, the plurality of second grooves 112 and the plurality of first grooves 111 on the base plate 11 are covered. The covered first grooves 111 form second flow channels 102, and the covered second grooves 112 form first flow channels 101. The plurality of first grooves 111 and the plurality of first flow channels 101 are arranged alternately in the Y direction, thereby making the formed plurality of second flow channels 102 and the plurality of first flow channels 101 alternately arranged in the Y direction. Through this embodiment, since the first grooves 111 and the second grooves 112 are processed on the base plate 11 first, and then the substrate 12 and the base plate 11 are connected, it is convenient to open and arrange the plurality of second flow channels 102 and the plurality of first flow channels 101, reducing the processing difficulty of the plurality of second flow channels 102 and the plurality of first flow channels 101, and improving the design rationality of the flow channels on the flow channel plate 10.

[0074] It is understandable that the base plate 11 and the substrate 12 can be fixed together by means of bonding, welding, riveting or screw connection.

[0075] Reference Figure 4 The plurality of first grooves 111 and the plurality of second grooves 112 extend along the X direction. The plurality of first grooves 111 are approximately the same length, and the length of the plurality of first grooves 111 is slightly less than the length of the flow channel plate 10. Similarly, the plurality of second grooves 112 are approximately the same length, and the length of the plurality of second grooves 112 is slightly less than the length of the flow channel plate 10.

[0076] Multiple first grooves 111 and multiple second grooves 112 are arranged alternately in an ABABAB... pattern, that is, there is a second groove 112 between every two first grooves 111 and a first groove 111 between every two second grooves 112.

[0077] Reference Figure 4 In the Z direction, a plurality of partitions are provided between the base plate 11 and the substrate 12. The partitions are arranged at intervals along the Y direction. The partitions, the base plate 11 and the substrate 12 together form a plurality of first flow channels 101 and a plurality of second flow channels 102.

[0078] Reference Figure 4 The plurality of partitions includes a plurality of first partitions 113. The first groove 111 and the second groove 112 are separated by the protruding first partitions 113. A first partition 113 is provided between each pair of adjacent first grooves 111 and second grooves 112. Specifically, the bottom plate 11 is provided with a plurality of first partitions 113 on the side facing the substrate 12. The plurality of first partitions 113 extend along the X direction and are arranged at intervals along the Y direction. A groove is formed between any two adjacent first partitions 113. In any pair of adjacent grooves, one is necessarily a first groove 111 and the other is necessarily a second groove 112. That is, any three first partitions 113 form a first groove 111 and a second groove 112.

[0079] Reference Figure 4 Multiple first through holes 103 are formed on the substrate 12. A first flow guide plate 20 is disposed on the side of the substrate 12 opposite to the bottom plate 11. The third flow channel 201 is formed by the first flow guide plate 20 and the substrate 12 together. Specifically, the substrate 12 covers the groove on the first flow guide plate 20 to form the third flow channel 201. Since the substrate 12 is a flat plate, it not only facilitates the connection between the first flow guide plate 20 and the substrate 12, but also facilitates the sealing between the first flow guide plate 20 and the bottom plate 11, and also facilitates the sealing between the first flow guide plate 20 and the first flow guide plate 20, thus ensuring the sealing performance of the third flow channel 201.

[0080] Reference Figure 4The first drain plate 20 is located at the edge of the substrate 12 in the X direction, meaning that the first drain plate 20 is as close as possible to the edge of the substrate 12 in the X direction, so that as many battery cells 4 as possible can be disposed on the substrate 12. In addition, multiple first through holes 103 are located at one end of multiple first flow channels 101 near the flow channel plate 10. Since the ends of the first flow channels 101 are close to the edge of the flow channel plate 10 in the X direction, and the first drain plate 20 is also located at the edge of the substrate 12 in the X direction, it facilitates the communication between the multiple first through holes 103 and the multiple first flow channels 101 and the third flow channel 201. It is understood that in some other embodiments, the first drain plate 20 may be disposed at other locations on the substrate 12.

[0081] Reference Figure 4 In some embodiments, the third flow channel 201 is connected to the water outlet 32, that is, the coolant in the multiple first flow channels 101 converges into the third flow channel 201 through multiple first through holes 103, and then flows out through the water outlet 32.

[0082] In order to allow the coolant in the multiple first flow channels 101 to flow smoothly through the multiple first through holes 103 and converge into the third flow channel 201, the multiple baffles also include multiple second baffles 114. Specifically, the bottom plate 11 is provided with multiple second baffles 114 on the side facing the substrate 12. The second baffles 114 are used to block one end of the second groove 112 so that one end of the formed first flow channel 101 is not flowing. The first through holes 103 are connected to the non-flowing end of the first flow channel 101, so that the coolant in the first flow channel 101 can flow smoothly through the first through holes 103 into the third flow channel 201, so as to converge the coolant in the multiple first flow channels 101 into the third flow channel 201.

[0083] In some embodiments, at least three second partitions 114 are spaced apart along the Y direction. It is understood that a second partition 114 may be connected to the ends of two first partitions 113, or it may be connected to the ends of three or more first partitions 113.

[0084] The above describes how multiple first flow channels 101 are connected to a third flow channel 201 to achieve a parallel configuration of multiple first flow channels 101. To achieve a parallel configuration of multiple second flow channels 102, refer to... Figure 4In some embodiments, the flow channel plate 10 also includes a fourth flow channel 104 extending along the Y direction, while multiple second flow channels 102 extend along the X direction, each extending to the fourth flow channel 104, so that all the second flow channels 102 can communicate with the fourth flow channel 104. In this embodiment, since the extension direction of the multiple second flow channels 102 is approximately perpendicular to the fourth flow channel 104, communication between the fourth flow channel 104 and the multiple second flow channels 102 is facilitated. Moreover, by utilizing the flow channel plate 10 itself to form the fourth flow channel 104 within the flow channel plate 10, this embodiment can effectively reduce the number of components in the liquid cooling plate 3, thus simplifying the structure of the liquid cooling plate 3. Specifically, the fourth flow channel 104 can be located on one side of the multiple second flow channels 102 in the X direction.

[0085] Reference Figure 4 In some embodiments, the surface of the base plate 11 facing the substrate 12 is further provided with a fourth groove 115. The fourth groove 115 is located on one side of the plurality of first grooves 111 in the X direction. The extension direction of the fourth groove 115 is consistent with the Y direction. One end of the plurality of first grooves 111 facing the fourth groove 115 is connected to the fourth groove 115. The substrate 12 covers the fourth groove 115 and forms a fourth flow channel 104.

[0086] Specifically, the multiple partitions also include two third partitions 116. Specifically, the surface of the base plate 11 facing the substrate 12 also has two protruding third partitions 116. The two third partitions 116 are located at the two edges of the base plate 11 in the X direction. The two outermost first partitions 113 are located at the two edges of the base plate 11 in the Y direction, and the two outermost first partitions 113 extend to connect with the two third partitions 116. The surface of the substrate 12 facing the base plate 11 is attached and sealed to the multiple first partitions 113, multiple second partitions 114 and two third partitions 116, thereby sealing the multiple first grooves 111, multiple second grooves 112 and fourth grooves 115, and forming multiple second flow channels 102, multiple first flow channels 101 and fourth flow channels 104. The first partitions 113 located between the two outermost first partitions 113 do not extend to the third partition 116 at one end in the X direction, leaving a gap between them, which is the fourth groove 115. Since the ends of the multiple second grooves 112 facing the fourth groove 115 are separated by the second partition 114, the multiple second grooves 112 and the fourth groove 115 are separated by the second partition 114, thus making the multiple first flow channels 101 and the fourth flow channel 104 not connected.

[0087] To connect multiple second flow channels 102 and multiple first flow channels 101, refer to Figure 4In some embodiments, the other end of the plurality of first partitions 113 located between the two outermost first partitions 113 in the X direction does not extend to another third partition 116, and a gap is left between them, which is a fifth groove 117. The substrate 12 covers the fifth groove 117 and forms a fifth flow channel 106. The fifth groove 117 extends in the Y direction. A plurality of first grooves 111 and a plurality of second grooves 112 are located between the fourth groove 115 and the fifth groove 117, that is, the fourth groove 115 and the fifth groove 117 are located in the X direction between the plurality of first grooves 111 and the plurality of second grooves 112. On both sides, the ends of multiple first grooves 111 and multiple second grooves 112 facing the fifth groove 117 all extend to the fifth groove 117 and communicate with the fifth groove 117. That is, multiple second flow channels 102 and multiple first flow channels 101 are located between the fourth flow channel 104 and the fifth flow channel 106. Multiple second flow channels 102 and multiple first flow channels 101 all extend to communicate with the fifth flow channel 106, so that the coolant flowing out of multiple first flow channels 101 can be diverted to multiple second flow channels 102 through the fifth flow channel 106, so that the multiple second flow channels 102 and multiple first flow channels 101 can be connected through the fifth flow channel 106. Furthermore, since multiple second flow channels 102 and multiple first flow channels 101 extend to communicate with the fifth flow channel 106, the coolant in the multiple first flow channels 101 will mix in the fifth flow channel 106, and after mixing, it will be distributed to the multiple second flow channels 102, making the temperature of the coolant in the multiple second flow channels 102 more uniform.

[0088] Reference Figure 4 In some embodiments, a third through hole 105 is provided on the substrate 12, and the third through hole 105 is directly opposite to the fourth groove 115 in the Z direction so as to communicate with the fourth flow channel 104.

[0089] To facilitate connection with the outlet nozzle 32 and the inlet nozzle 31, in some embodiments, the first guide plate 20 has a first assembly hole 202 and a second assembly hole 203 penetrating through it. The first assembly hole 202 communicates with the third flow channel 201. The second assembly hole 203 is isolated from the third flow channel 201, specifically, the first assembly hole 202 and the second assembly hole 203 are located on one side of the third flow channel 201 in the X direction. The second assembly hole 203 is used to communicate with the fourth flow channel 104. The first assembly hole 202 is used to install and connect the inlet nozzle 31, and the second assembly hole 203 is used to install and connect the outlet nozzle 32. The second assembly hole 203 is directly opposite the third through hole 105 in the Z direction, so that the outlet nozzle 32 communicates with the fourth flow channel 104 through the third through hole 105. In this embodiment, both the outlet nozzle 32 and the inlet nozzle 31 are provided on the first guide plate 20, which can effectively simplify the liquid cooling plate 3 and reduce the assembly and processing difficulty of the liquid cooling plate 3. It is understandable that the inlet of the water inlet 31 is provided with the liquid inlet of the liquid cooling plate 3, and the outlet of the water outlet 32 ​​is provided with the liquid outlet of the liquid cooling plate 3.

[0090] In some other embodiments, the fourth flow channel 104 may be connected to the inlet nozzle 31, so that the coolant enters the fourth flow channel 104 from the inlet nozzle 31, and then flows through the fourth flow channel 104 to multiple second flow channels 102, and then flows from the multiple second flow channels 102 to multiple first flow channels 101, and converges through multiple first through holes 103 to the third flow channel 201, and finally flows out from the outlet nozzle 32.

[0091] Figure 4 In this embodiment, the third flow channel 201 is connected to multiple first flow channels 101. It is understood that in some other embodiments, the third flow channel 201 may also be connected to multiple second flow channels 102. In this case, multiple first through holes 103 can be used to connect multiple second flow channels 102 to the third flow channel 201 respectively. At this time, the multiple first flow channels 101 are located downstream of the multiple second flow channels 102.

[0092] Figure 5 An exploded view of another liquid cooling plate 3 provided in an embodiment of this application. Figure 5 Examples and Figure 4 The main difference in the liquid cooling plate 3 in the embodiments is the different installation position of the first drainage plate 20. The following mainly describes... Figure 5 Examples and Figure 4 The differences between the embodiments are as follows; the same features can be referred to Figure 4 Example.

[0093] Reference Figure 5 In some embodiments, the first drain plate 20 is disposed on the side of the base plate 11 away from the substrate 12, so that the entire surface of the substrate 12 away from the base plate 11 can be used to support the battery cell 4, thereby improving the energy density of the battery pack 1.

[0094] To ensure the sealing of the third flow channel 201 between the first guide plate 20 and the flow channel plate 10, in some embodiments, the surface of the first guide plate 20 facing the flow channel plate 10 is provided with a groove 21. The liquid cooling plate 3 also includes a cover plate 40 stacked between the flow channel plate 10 and the first guide plate 20. The cover plate 40 closes the groove 21 on the first guide plate 20 and forms the third flow channel 201. Since the bottom plate 11 is provided with many grooves 21, the two side surfaces of the bottom plate 11 in the Z direction are uneven. It is difficult to directly seal the grooves 21 on the first guide plate 20 by the bottom plate 11. In this embodiment, by adding a cover plate 40 and stacking it with the first guide plate 20, the grooves 21 of the first guide plate 20 are sealed, thereby improving the sealing performance of the formed third flow channel 201. Then the cover plate 40 is connected to the base plate 11, such as by welding, bonding or screwing. Since there is no need to consider sealing when connecting the cover plate 40 and the base plate 11, the connection difficulty between the cover plate 40 and the base plate 11 can be effectively reduced.

[0095] To achieve communication between the third flow channel 201 and multiple first flow channels 101, multiple first through holes 103 communicating with the multiple first flow channels 101 are formed on the base plate 11, and multiple second through holes 401 are formed on the cover plate 40. The multiple second through holes 401 and the multiple first through holes 103 are aligned and connected in the Z direction, so that the coolant in the third flow channel 201 can be sequentially diverted to the multiple first flow channels 101 through the multiple first through holes 103 and the multiple second through holes 401. It can be understood that the multiple second through holes 401 and the multiple first through holes 103 being aligned in the Z direction means that the projections of the multiple second through holes 401 and the multiple first through holes 103 in the Z direction at least partially overlap.

[0096] In this embodiment, both the outlet nozzle 32 and the inlet nozzle 31 are mounted on the first guide plate 20. The outlet nozzle 32 is mounted on the second assembly hole 203 and communicates with it. The inlet nozzle 31 is mounted on the first assembly hole 202 and communicates with it. Since the first guide channel is located on the side of the base plate 11 away from the base plate 12, the third through hole 105 is opened on the base plate 11, and the cover plate 40 is provided with a fourth through hole 402. In the Z direction, the second assembly hole 203, the fourth through hole 402, and the third through hole 105 are directly opposite each other. The third through hole 105 communicates with the fourth flow channel 104, so that the coolant flowing in from the inlet nozzle 31 enters the fourth flow channel 104 in sequence through the second assembly hole 203, the fourth through hole 402, and the third through hole 105, and then is divided into multiple second flow channels 102 through the fourth flow channel 104.

[0097] Figure 5The groove 21 on the first drainage plate 20 and the plurality of first grooves 111, plurality of second grooves 112, fourth grooves 115 and fifth grooves 117 on the bottom plate 11 in the embodiment can be referred to. Figure 4 The specific details in the embodiments will not be repeated here.

[0098] Figure 6 An exploded view of another liquid cooling plate 3 provided in an embodiment of this application. Figure 6 Examples and Figure 4 The main difference in the liquid cooling plate 3 of the embodiment is that it also includes a second drainage plate 50. The following mainly describes... Figure 6 Examples and Figure 4 The differences between the embodiments are as follows; the same features can be referred to Figure 4 Example.

[0099] Reference Figure 6 In some embodiments, the liquid cooling plate 3 further includes a second flow guide plate 50 stacked with the flow channel plate 10. The second flow guide plate 50 and the first flow guide plate 20 are located on opposite sides of the flow channel plate 10 in the Z direction. For example, the first flow guide plate 20 is disposed on the side of the substrate 12 away from the bottom plate 11, and the first flow guide plate 20 is disposed on the side of the bottom plate 11 away from the substrate 12. The substrate 12 is used to seal and cover the groove 21 on the first flow guide plate 20 and form the third flow channel 201. Since the substrate 12 is a flat plate, the sealing difficulty between the substrate 12 and the first flow guide plate 20 can be reduced, and the sealing performance of the third flow channel 201 can be improved.

[0100] The first diversion plate 20 has a first assembly hole 202 that penetrates the first diversion plate 20. The first assembly hole 202 is connected to the third flow channel 201 and is used to install and connect the water inlet 31.

[0101] The second drainage plate 50 has a second mounting hole 501 that penetrates through it, and a third through hole 105 is formed on the base plate 11, with the third through hole 105 and the second mounting hole 501 directly opposite each other in the Z direction. Since the second drainage plate 50 can have only the second mounting hole 501, its volume is small, facilitating a direct and sealed connection with the base plate 11 without the need for a similar... Figure 5 The cover plate 40 in the embodiment is a type of intermediate partition. The second assembly hole 501 communicates with the fourth flow channel 104 and is used to install and connect the water outlet 32.

[0102] In this embodiment, since the inlet nozzle 31 and the outlet nozzle 32 are located on opposite sides of the flow channel plate 10, the installation position of the outlet nozzle 32 and the inlet nozzle 31 can be flexible to adapt to different installation environments.

[0103] Figure 7 An exploded view of another liquid cooling plate 3 provided in an embodiment of this application. Figure 7 Liquid cooling plate 3 in the embodiment and Figure 6 The main difference in the embodiments is the location of the fourth flow channel. The following mainly describes... Figure 7 Examples and Figure 6 The differences between the embodiments are as follows; the same features can be referred to Figure 6 Example.

[0104] Reference Figure 7 In some embodiments, the first flow guide plate 20 and the second flow guide channel are located on opposite sides of the flow channel plate 10 in the Z direction. For example, the first flow guide plate 20 is located on the side of the substrate 12 away from the bottom plate 11, and the second flow guide plate 50 is located on the side of the bottom plate 11 away from the substrate 12. The third flow channel 201 is disposed between the first flow guide plate 20 and the substrate 12, and the fourth flow channel 502 is disposed between the flow guide plate and the second flow guide plate 50. A plurality of first through holes 103 are disposed on the substrate 12 and communicate with the third flow channel 201 and the plurality of first flow channels 101, respectively. A plurality of fifth through holes 107 are also provided on the flow guide plate. The plurality of fifth through holes 107 are directly opposite to the plurality of second flow channels 102 in the Z direction and are also directly opposite to the fourth flow channel 502, thereby connecting the plurality of second flow channels 102 and the fourth flow channel 502 through the plurality of fifth through holes 107. Since the fourth flow channel 502 is located between the base plate 11 and the second guide plate 50, multiple first partitions 113 can extend to connect with the third partition 116, thereby blocking one end of multiple second flow channels 102 and one end of multiple first flow channels 101. Furthermore, in this embodiment, the second assembly hole 501 is formed on the second guide plate 50. In this embodiment, since neither the third flow channel 201 nor the fourth flow channel 502 is formed within the flow channel plate 10, the processing difficulty of the flow channel plate 10 can be reduced.

[0105] Figure 8 An exploded view of another liquid cooling plate 3 provided in an embodiment of this application. Figure 8 Liquid cooling plate 3 in the embodiment and Figure 4 The main difference in the embodiments is the different connection methods of the multiple second flow channels 102 and the multiple first flow channels 101. The following mainly describes... Figure 8 Examples and Figure 4 The differences between the embodiments are as follows; the same features can be referred to Figure 4 Example.

[0106] Reference Figure 8 In some embodiments, a portion of the first partitions 113 extend toward one end of the fifth groove 117 to connect with the third partition 116, thereby dividing the fifth groove 117 into multiple segments in the Y direction, for example... Figure 8In this configuration, one first flow channel 101 can be connected to one or two second flow channels 102. By dividing the fifth groove 117 into multiple segments through the first partition 113, the flow rate uniformity within each first flow channel 101 after the coolant flows from the second flow channel 102 to the first flow channel 101 can be improved.

[0107] Figure 9 An exploded view of another liquid cooling plate 3 provided in an embodiment of this application. Figure 9 Liquid cooling plate 3 in the embodiment and Figure 4 The main difference in this embodiment is the addition of a protrusion 60. The following mainly describes... Figure 9 Examples and Figure 4 The differences between the embodiments are as follows; the same features can be referred to Figure 4 Example.

[0108] Reference Figure 9 In some embodiments, the liquid cooling plate 3 further includes a plurality of protrusions 60, which are disposed within a plurality of second flow channels 102 or a plurality of first flow channels 101, and are spaced apart along the extending direction of the second flow channels 102 or the first flow channels 101. The protrusions 60 can play a role in airflow, thereby improving the heat exchange efficiency between the coolant and the battery cell 4.

[0109] In some embodiments, the closer the multiple protrusions 60 located in the second flow channel 102 are to the fifth groove 117, the smaller the distance between two adjacent protrusions 60. Similarly, the closer the multiple protrusions 60 located in the first flow channel 101 are to the fourth groove 115, the smaller the distance between two adjacent protrusions 60. Since the coolant flows sequentially through the inlet 31, the first flow channel 101, the second flow channel 102, and the outlet 32, it exchanges heat with the battery cell 4 during the flow process, resulting in a higher temperature of the coolant towards the end. In this embodiment, because the closer the multiple protrusions 60 located in the second flow channel 102 are to the fifth groove 117, the smaller the distance between two adjacent protrusions 60, resulting in a better turbulence effect, the heat dissipation effect of the front and rear sections of the second flow channel 102 on the battery cell 4 is more balanced. Similarly, the closer the multiple protrusions 60 located in the first flow channel 101 are to the fourth groove 115, the smaller the distance between two adjacent protrusions 60, and the better the turbulence effect, so that the heat dissipation effect of the front and rear sections of the first flow channel 101 on the battery cell 4 is more balanced.

[0110] 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 cooling plate for a battery pack, characterized in that, The liquid cooling plate includes a flow channel plate, in which a first type of flow channel and a second type of flow channel are provided. The first type of flow channel and the second type of flow channel are connected and arranged side by side and alternately arranged in the side by side direction. The flow directions of the first type of flow channel and the second type of flow channel are opposite, and the flow direction is the flow direction of the coolant in the flow channel. The liquid cooling plate further includes a first flow guide plate, which is disposed on the outer surface of the flow channel plate and forms a third flow channel between the outer surface of the flow channel plate. The third flow channel is used to communicate with the liquid inlet or liquid outlet of the liquid cooling plate and extends along the parallel arrangement direction. The outer surface of the flow channel plate is provided with a plurality of first through holes, which are used to connect the third flow channel in the flow guide plate with the first type of flow channel. The first type of flow channel includes a plurality of first flow channels corresponding to the plurality of first through holes.

2. The liquid cooling plate according to claim 1, characterized in that, In the thickness direction of the flow channel plate, the first guide plate and the flow channel plate are stacked together, and the plurality of first through holes are disposed on the outer surface of the flow channel plate in the thickness direction.

3. The liquid cooling plate according to claim 2, characterized in that, In the thickness direction, the plurality of first through holes are directly opposite to the plurality of first flow channels, and in the thickness direction, the plurality of first through holes are directly opposite to the third flow channel.

4. The liquid-cooled plate according to any one of claims 1-3, characterized in that, The first guide plate is attached to the outer surface of the flow channel plate, and the first guide plate and the outer surface of the flow channel plate together form the third flow channel.

5. The liquid-cooled plate according to any one of claims 1-3, characterized in that, The first guide plate has a groove on its surface facing the flow channel plate. The liquid cooling plate also includes a cover plate stacked between the outer surface of the flow channel plate and the first guide plate. The cover plate closes the groove on the first guide plate and forms the third flow channel. The cover plate has a plurality of second through holes, and the plurality of second through holes and the plurality of first through holes are aligned in the thickness direction of the flow channel plate.

6. The liquid-cooled plate according to any one of claims 1-3, characterized in that, The flow channel plate is further provided with a fourth flow channel, which extends along the parallel arrangement direction. The second type of flow channel includes multiple second flow channels that are all connected to the fourth flow channel. The third flow channel is used to connect with one of the liquid inlet or liquid outlet of the liquid cooling plate, and the fourth flow channel is used to connect with the other of the liquid inlet or liquid outlet.

7. The liquid cooling plate according to claim 4, characterized in that, The flow channel plate is further provided with a fourth flow channel, which extends along the parallel arrangement direction. The second type of flow channel includes multiple second flow channels that are all connected to the fourth flow channel. The third flow channel is used to connect with one of the liquid inlet or liquid outlet of the liquid cooling plate, and the fourth flow channel is used to connect with the other of the liquid inlet or liquid outlet.

8. The liquid cooling plate according to claim 5, characterized in that, The flow channel plate is further provided with a fourth flow channel, which extends along the parallel arrangement direction. The second type of flow channel includes multiple second flow channels that are all connected to the fourth flow channel. The third flow channel is used to connect with one of the liquid inlet or liquid outlet of the liquid cooling plate, and the fourth flow channel is used to connect with the other of the liquid inlet or liquid outlet.

9. The liquid cooling plate according to claim 6, characterized in that, The first flow guide plate has a first assembly hole and a second assembly hole. The first assembly hole is connected to the third flow channel, and the second assembly hole is connected to the fourth flow channel. The first assembly hole is used to connect one of the liquid inlet and the liquid outlet, and the second assembly hole is used to connect the other of the liquid inlet and the liquid outlet.

10. The liquid cooling plate according to claim 6, characterized in that, The first flow guide plate has a first assembly hole, which communicates with the third flow channel and is used to connect one of the liquid inlet and the liquid outlet. The liquid cooling plate also includes a second flow guide plate, which is disposed on the outer surface of the flow channel plate. The second flow guide plate has a second assembly hole, which communicates with the fourth flow channel and is used to connect the other of the liquid inlet and the liquid outlet.

11. The liquid cooling plate according to claim 10, characterized in that, The second flow guide plate and the flow channel plate are stacked in the thickness direction of the flow channel plate. The outer surface of the flow channel plate is also provided with a third through hole that communicates with the fourth flow channel. The second assembly hole communicates with the third through hole.

12. The liquid cooling plate according to claim 11, characterized in that, In the thickness direction, the second guide plate and the first guide plate are located on opposite sides of the flow channel plate.

13. The liquid cooling plate according to claim 6, characterized in that, In the flow channel direction, the fourth flow channel is located on one side of the first type of flow channel, and the plurality of first through holes are located at one end of the plurality of first flow channels facing the fourth flow channel.

14. The liquid-cooled plate according to claim 7, characterized in that, In the flow channel direction, the fourth flow channel is located on one side of the first type of flow channel, and the plurality of first through holes are located at one end of the plurality of first flow channels facing the fourth flow channel.

15. The liquid-cooled plate according to any one of claims 1-3, characterized in that, The flow channel plate includes a base plate and a base plate stacked together. The surface of the base plate facing the base plate is provided with a plurality of first grooves and a plurality of second grooves. The plurality of first grooves and the plurality of second grooves are alternately arranged along the side-by-side arrangement direction. The base plate closes the plurality of first grooves to form a plurality of first flow channels of the first type of flow channel. The base plate closes the plurality of second grooves to form a plurality of second flow channels of the second type of flow channel. The first flow guide plate is located on the outer surface of the base plate on the side away from the base plate. The plurality of first through holes are formed on the base plate.

16. The liquid cooling plate according to claim 6, characterized in that, The flow channel plate includes a base plate and a base plate stacked together. The surface of the base plate facing the base plate is provided with a plurality of first grooves and a plurality of second grooves. The plurality of first grooves and the plurality of second grooves are alternately arranged along the side-by-side arrangement direction. The base plate closes the plurality of first grooves to form a plurality of first flow channels of the first type of flow channel. The base plate closes the plurality of second grooves to form a plurality of second flow channels of the second type of flow channel. The first flow guide plate is located on the outer surface of the base plate on the side away from the base plate. The plurality of first through holes are formed on the base plate.

17. The liquid-cooled plate according to any one of claims 1-3, characterized in that, The liquid cooling plate also includes a plurality of protrusions, which are disposed in the first type of flow channel or the second type of flow channel, and the plurality of protrusions are spaced apart along the flow channel direction.

18. 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 1-17 above, wherein the plurality of battery cells are disposed on the flow channel plate, and each of the battery cells is directly opposite the first type of flow channel and the second type of flow channel in the thickness direction of the liquid cooling plate.

19. The battery pack according to claim 18, characterized in that, The plurality of battery cells includes multiple rows of battery cells, which are arranged side by side along the side-by-side arrangement direction, and multiple battery cells in each row are arranged along the flow channel direction.

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