Liquid cold plate assembly and energy storage device

Abstract

The application discloses a liquid cooling plate assembly and an energy storage device, and relates to the technical field of energy storage, wherein the liquid cooling plate assembly comprises a metal plate and a plastic plate which are arranged in layers; the plastic plate is provided with a first channel, a second channel, a water inlet and a water outlet; the first channel is located on a first side of the water inlet and the water outlet, and the second channel is located on a second side of the water inlet and the water outlet; the water inlet of the first channel and the water inlet of the second channel are in communication with the water inlet, and the water outlet of the second channel and the water outlet of the second channel are in communication with the water outlet; in the technical scheme provided by the application, the density of the plastic plate is lower, which means that the weight under the same volume is lighter, and the light weight of the whole energy storage device and the reduction of the material cost are achieved, and the transportation cost is also reduced. Moreover, the first channel and the second channel are arranged on the plastic plate, the different battery cells can be cooled in different zones, and the cooling effect is better.

Description

Technical Field

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

[0002] Energy storage devices typically incorporate cooling modules to ensure safe and efficient operation. Cooling methods vary; for water-cooled modules, they primarily consist of liquid cooling plates and pipes. The liquid cooling plates are in contact with the battery cells within the energy storage system to achieve heat exchange. Through the circulation of coolant within the plates, the heat generated by the energy storage batteries during charging and discharging is rapidly absorbed, effectively controlling the battery temperature within a suitable range. This not only extends battery life but also improves the overall performance and stability of the energy storage system.

[0003] Liquid cooling plates are generally composed of two composite plates, both of which are made of aluminum. However, aluminum plates have higher production costs and are heavier, which also increases transportation costs. Utility Model Content

[0004] Several embodiments in this application propose a liquid-cooled plate assembly and an energy storage device, with the aim of providing a liquid-cooled plate assembly with lower production costs and lighter weight.

[0005] An embodiment of this application provides a liquid-cooled plate assembly comprising a stacked metal plate and a plastic plate; the plastic plate has a first channel, a second channel, a water inlet, and a water outlet; the first channel is located on a first side of the water inlet and the water outlet, and the second channel is located on a second side of the water inlet and the water outlet; the water inlet of the first channel and the water inlet of the second channel are both connected to the water inlet, and the water outlet of the second channel and the water outlet of the second channel are both connected to the water outlet.

[0006] In one embodiment, the metal plate is welded to the plastic plate.

[0007] In one embodiment, the first channel includes an inlet channel, an outlet channel, and a plurality of bend channels, wherein the inlet channel is connected to the inlet interface, and the outlet channel is connected to the outlet interface;

[0008] Each of the bent flow channels is located between the inlet flow channel and the outlet flow channel, and each of the bent flow channels has an inlet end and an outlet end, with the inlet end connected to the inlet flow channel and the outlet end connected to the outlet flow channel.

[0009] In one embodiment, the bent flow channel includes at least two straight sections and at least one bent section, with at least two straight sections spaced apart and each pair of adjacent straight sections connected by a bent section.

[0010] In one embodiment, the bent flow channel includes a first straight section, a second straight section, and a third straight section arranged sequentially at intervals. The first straight section has the water inlet end, and the end of the first straight section away from the water inlet end is connected to the second straight section through the first bent section.

[0011] The third straight section has a water outlet end, and the end of the third straight section away from the water outlet end is connected to the end of the second straight section away from the first bending section through the second bending section.

[0012] In one embodiment, the metal plate is made of aluminum or an aluminum alloy.

[0013] In one embodiment, the liquid cooling plate assembly further includes an inlet pipe and an outlet pipe, which are disposed on the metal plate or plastic plate. The inlet pipe is connected to the inlet interface, and the outlet pipe is connected to the outlet interface.

[0014] In one embodiment, the plastic plate has a structural groove on the side facing away from the metal plate. The structural groove is formed by the first channel and / or the second channel, and a plurality of reinforcing ribs are provided inside the structural groove.

[0015] In one embodiment, the metal plate is provided with at least two first mounting holes, and the plastic plate is provided with at least two second mounting holes. Each first mounting hole and each second mounting hole are coaxially arranged, and a mounting member passes through the first mounting hole and the second mounting hole.

[0016] One embodiment of this application also proposes an energy storage device, comprising:

[0017] At least two battery cells;

[0018] In the liquid cooling plate assembly described above, the side of the metal plate facing away from the plastic plate is in contact with the two battery cells respectively.

[0019] The embodiments provided in this application employ metal plates and plastic plates of different materials. The metal plate contacts the battery cell, while the plastic plate forms a first channel and a second channel for the flow of coolant. The plastic plate and metal plate are then welded together to form a liquid-cooled plate, thereby reducing production costs and achieving lightweighting of the liquid-cooled plate assembly. Specifically, the liquid-cooled plate assembly includes stacked metal plates and plastic plates. The plastic plate has a first channel and a second channel on a first side and a second side, respectively. Both the first and second channels allow coolant to flow, enabling the coolant to contact the metal plate and carry away the heat generated by heat exchange between the metal plate and the battery cell, thus achieving cooling. The lower density of the plastic plate means a lighter weight for the same volume, contributing to the overall lightweighting of the energy storage device and reducing material costs, as well as transportation costs. Moreover, the first and second channels on the plastic plate allow for targeted cooling of different battery cell zones, preventing interference between different cells and resulting in better cooling performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 An exploded view of an embodiment of the liquid cooling plate assembly provided in this application;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the plastic sheet facing away from the metal sheet;

[0023] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0024] Figure 4 This is a schematic diagram of the first channel.

[0025] Explanation of icon numbers:

[0026] 100. Liquid cooling plate assembly; 1. Metal plate; 1a. First mounting hole; 2. Plastic plate; 21. First channel; 211. Water inlet channel; 212. Water outlet channel; 213. Bent channel; 2131. Straight section; 2132. Bent section; 2133. Water inlet end; 2134. Water outlet end; 22. Second channel; 23. Water inlet interface; 24. Water outlet interface; 25. Reinforcing rib; 2a. First side; 2b. Second side; 2c. Structural groove; 2d. Second mounting hole; 3. Water inlet pipe; 4. Water outlet pipe. Detailed Implementation

[0027] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0030] Liquid cooling plates used for heat dissipation and cooling of energy storage devices are generally composed of two composite plates, both of which are made of aluminum. However, aluminum plates have higher production costs and are heavier, which also increases transportation costs.

[0031] To address the aforementioned problems, this application proposes a liquid-cooled plate assembly 100 to solve the technical issues mentioned above.

[0032] Please see Figure 1In one embodiment of this application, the liquid cooling plate assembly 100 includes a metal plate 1 and a plastic plate 2 stacked together; the plastic plate 2 has a first channel 21, a second channel 22, a water inlet 23, and a water outlet 24; the first channel 21 is located on the first side 2a of the water inlet 23 and the water outlet 24, and the second channel 22 is located on the second side 2b of the water inlet 23 and the water outlet 24; the water inlet of the first channel 21 and the water inlet of the second channel 22 are both connected to the water inlet 23, and the water outlet of the second channel 22 and the water outlet of the second channel 22 are both connected to the water outlet 24.

[0033] It is understandable that the plastic plate 2 is divided into a first side 2a and a second side 2b by the line connecting the water inlet port 23 and the water outlet port 24. For details, please refer to further information. Figure 1 The first side 2a and the second side 2b are the areas shown by the dotted lines in the figure. In this way, the liquid cooling plate assembly 100 can form two cooling areas that cool different battery cells respectively. The two cooling areas are in contact with the two sets of battery cells arranged side by side to cool the two battery cells. In actual installation, it is necessary to ensure that the first side 2a and the second side 2b are in close contact with the two battery cells respectively. The heat generated by the battery cells during charging and discharging is transferred to the metal plate 1 by heat transfer, and then transferred through the metal plate 1 to the coolant in contact with the side of the metal plate 1 that is opposite to the battery cells. The flowing coolant absorbs the heat and carries it away to complete the cooling cycle. Furthermore, the first side 2a and the second side 2b are arranged along the length of the plastic plate 2, that is, the second direction. The first side 2a abuts against the side of one battery cell for heat dissipation, and the second side 2b abuts against the side of another battery cell for heat dissipation.

[0034] In the technical solution of this application, the first channel 21 located on the first side 2a and the second channel 22 located on the second side 2b are mirror-symmetrical about the connection between the water inlet 23 and the water outlet 24. The heat exchange area of ​​the battery cell, the layout of the channel, the water inlet and outlet method and the width of the flow channel are consistent. The specific structure and layout of the first channel 21 will be described in detail below. The second channel 22 can be obtained in the same way, so it will not be described in detail again.

[0035] To increase the heat dissipation contact area with the battery cell, the area and shape of the metal plate 1 are adaptively designed according to the type and shape of the battery cell. This application does not limit the area and shape of the metal plate 1 and the plastic plate 2. For example, when the energy storage device uses cylindrical battery cells, the metal plate 1 can adopt a serpentine structure, that is, it has multiple bends, each bend extending into the area formed between two adjacent cylindrical battery cells, thereby increasing the heat exchange area with the battery cell. Correspondingly, the plastic plate 2 is also designed according to the shape of the metal plate 1 and fits into the metal plate 1. As another example, when the energy storage device uses square battery cells, the metal plate 1 can adopt a straight plate structure. For details, please refer to further reference. Figure 1 The metal plate 1 is attached to the side or end face of the battery cell, while the plastic plate 2 is installed on the side of the metal plate 1 facing away from the battery cell. The length and width of the plastic plate 2 are slightly smaller than those of the metal plate 1. A certain amount of redundant size is left when the two are fitted together, which makes it easier to align and install them. In addition, by placing the plastic plate 2 on the metal plate 1 before welding, the welding difficulty can be further reduced, and the direct welding of the edges of the plastic plate 2 and the metal plate 1 can be avoided. This effectively avoids possible edge deformation or welding defects, improves welding quality and reliability, and thus enhances the overall strength and sealing performance of the liquid cooling plate assembly 100.

[0036] In this liquid-cooled plate assembly 100, a metal plate 1 and a plastic plate 2 are connected by welding. The metal plate 1 and the plastic plate 2 are made of different materials, and their welding connection can be achieved using laser welding technology. Laser welding utilizes a high-energy-density laser beam to irradiate the material surface, causing the material to rapidly melt and form a molten pool, which then cools and solidifies to form a strong weld. For welding metal and plastic, special laser welding processes are typically used, such as laser transmission welding. In this process, the laser beam penetrates the plastic plate 2 and acts on the surface of the metal plate 1, melting the metal. Simultaneously, the plastic partially melts and mixes with the molten metal upon contact, forming a reliable metallurgical bond. By precisely controlling the laser power, scanning speed, and spot size, the stability of the welding process and the quality of the weld can be ensured, thereby achieving a strong connection between two different materials while guaranteeing the sealing and structural strength of the liquid-cooled plate assembly 100. Compared to bonding, welding avoids the swelling or corrosion of adhesives in contact with coolant, which could prevent long-term use and make it unsuitable for the long service life of energy storage devices. In addition, welding can ensure a reliable connection between the two, ensuring that the liquid cooling plate assembly 100 will not loosen or leak coolant due to external force or coolant pressure during use.

[0037] The embodiments provided in this application employ metal plates and plastic plates of different materials. The metal plate contacts the battery cell, while the plastic plate forms a first channel and a second channel for the flow of coolant. The plastic plate and metal plate are then welded together to form a liquid-cooled plate, thereby reducing production costs and achieving lightweighting of the liquid-cooled plate assembly. Specifically, the liquid-cooled plate assembly includes stacked metal plates and plastic plates. The plastic plate has a first channel and a second channel on a first side and a second side, respectively. Both the first and second channels allow coolant to flow, enabling the coolant to contact the metal plate and carry away the heat generated by heat exchange between the metal plate and the battery cell, thus achieving cooling. The lower density of the plastic plate means a lighter weight for the same volume, contributing to the overall lightweighting of the energy storage device and reducing material costs, as well as transportation costs. Moreover, the first and second channels on the plastic plate allow for targeted cooling of different battery cell zones, preventing interference between different cells and resulting in better cooling performance.

[0038] Furthermore, since the thermal conductivity of plastic is much lower than that of metal, the plastic plate 2 can effectively reduce heat transfer during the cooling process. Specifically, as a flow channel for the coolant, the low thermal conductivity of the plastic plate 2 can significantly reduce heat exchange between the coolant and the external environment, thereby reducing heat loss and improving cooling efficiency. In addition, the low thermal conductivity of the plastic plate 2 can effectively prevent condensation. Due to its low thermal conductivity, the surface temperature changes relatively slowly, thus reducing condensation formation. This characteristic not only improves the reliability of the cooling system but also reduces maintenance costs and extends the service life of the liquid cooling plate assembly.

[0039] In one embodiment of this application, the liquid-cooled plate assembly 100 is connected to an external water channel to achieve coolant circulation. The external water channel includes a water pump, which draws coolant from the storage tank through suction, pressurizes it, and delivers it to the flow channel inlet of the liquid-cooled plate assembly 100 through the inlet pipe 3. The coolant flows in the first channel 21, absorbs the heat generated by the heat exchange between the metal plate 1 and the battery cell, and then returns to the storage tank through the outlet pipe 4, completing one cooling cycle. Both the inlet pipe 3 and the outlet pipe 4 are located on the metal plate 1. For details, please refer to further description. Figure 1 The metal plate 1 has an inlet for installing the inlet pipe 3 and an outlet for installing the outlet pipe 4. The inlet pipe 3 and the outlet pipe 4 are directly connected to the metal plate 1 by means of screw connection, interference fit plug connection, etc., or indirectly connected to the metal plate 1 by means of quick-release connector.

[0040] It should be noted that the inlet pipe 3 and outlet pipe 4 can be installed perpendicular to the metal plate 1 or can be led out from one end of the metal plate 1. This application does not impose any restrictions on this, but mainly depends on the specific installation requirements and overall layout of the liquid cooling plate assembly 100. When the liquid cooling plate assembly 100 needs to be installed compactly and space is limited, the inlet pipe 3 and outlet pipe 4 installed perpendicular to the metal plate 1 can reduce the occupation of horizontal space. For details, please refer to further reference. Figure 1 The inlet pipe 3 and outlet pipe 4 are led out through the gap between the battery cells and are vertically connected to other cooling system components (such as water pumps and liquid storage tanks). When the layout of the liquid cooling plate assembly 100 is relatively spacious, or when it needs to be connected to other horizontal pipes or equipment, the inlet pipe 3 and outlet pipe 4 leading out from one end of the metal plate 1 are more conducive to simplifying pipe connections, reducing the use of bends and connectors, thereby reducing system complexity and leakage risk. The design needs to be adjusted by comprehensively considering factors such as the structural design of the energy storage device, the layout of the cooling system, and the installation space. In one embodiment of this application, both the inlet pipe 3 and outlet pipe 4 are set perpendicular to the metal plate 1. For details, please refer to further... Figure 1 The inlet pipe 3 and outlet pipe 4 are located in the area between the first side 2a and the second side 2b. When the liquid cooling plate assembly 100 is installed in the energy storage device, the inlet pipe 3 and outlet pipe 4 are located between two parallel battery cells, making full use of the gap area between the battery cells. They do not occupy additional installation space, nor do they interfere with the structure of the battery cells, thus optimizing the rationality of the structural layout.

[0041] Furthermore, in addition to using a circular pipe design, the inlet pipe 3 and outlet pipe 4 can also adopt a flat pipe design, depending on the actual structural layout of the energy storage device. Circular pipes have a uniform cross-section and high structural strength, making them suitable for applications with low space integration requirements. Flat pipe designs, on the other hand, have a smaller cross-sectional height, reducing the vertical space occupied, making them suitable for space-constrained or compact layout applications. Flat pipes can also improve heat exchange efficiency by increasing the contact area with the battery cells. Therefore, the shape and size of the inlet pipe 3 and outlet pipe 4 need to be adaptively designed according to the specific requirements and design constraints of the energy storage device to ensure optimal cooling system performance and space utilization efficiency.

[0042] Understandably, plastic plate 2 is typically made of injection-molded plastic to achieve lightweighting and cost reduction. Common plastic materials include polypropylene (PP), which has good chemical resistance and low density, making it suitable for liquid-cooled plastic plate 2, which requires lightweighting and corrosion resistance; polyethylene (PE) has good processing performance and low cost. The selection of materials needs to be comprehensively considered based on the actual application scenario of the liquid cooling plate, such as operating temperature, coolant type, and mechanical performance requirements, to ensure the performance and lifespan of plastic plate 2 during use.

[0043] It should be noted that the metal plate 1 can be made of pure aluminum, aluminum alloy, or other metals with good thermal conductivity. This application does not impose any restrictions on this. Pure aluminum has extremely high thermal conductivity, which can quickly conduct the heat generated by the battery cell, ensuring efficient thermal management. It is particularly suitable for energy storage systems with extremely high heat dissipation requirements and compact cell layouts, such as high-performance battery packs or high-power-density energy storage modules. Its low-density characteristics also help to achieve lightweight equipment. However, pure aluminum has relatively low mechanical strength, which may not be suitable for scenarios that withstand large mechanical stresses. In contrast, aluminum alloys, while maintaining good thermal conductivity, provide higher mechanical strength and better corrosion resistance, making them suitable for liquid cooling plates that need to withstand certain mechanical stresses or operate in complex environments, such as energy storage devices used in outdoor or industrial environments. Aluminum alloys can balance the heat dissipation performance and structural strength of the liquid cooling plate assembly 100.

[0044] In one embodiment of this application, to further increase the heat exchange area between the coolant and the battery cell, the first channel 21 includes an inlet channel 211, an outlet channel 212, and multiple bend channels 213. For details, please refer to further details. Figure 4 The inlet channel 211 has an inlet port 23 connected to the inlet pipe 3, and the outlet channel 212 has an outlet port 24 connected to the outlet pipe 4. Multiple bent channels 213 are provided on both the first side 2a and the second side 2b to increase the heat exchange area between the metal plate 1 and the battery cell. The inlet channel 211 is connected to the inlet pipe 3, and correspondingly, the outlet channel 212 is connected to the outlet pipe 4. Each bent channel 213 is located between the inlet channel 211 and the outlet channel 212, and each bent channel 213 has an inlet end 2133 and an outlet end 2134. The inlet end 2133 is connected to the inlet channel 211, and the outlet end 2134 is connected to the outlet channel 212. This arrangement allows the coolant to form a complex flow path within the first channel 21, extending its residence time within the liquid cooling plate, thereby increasing the contact area between the coolant and the metal plate 1 and further improving the heat exchange efficiency. Furthermore, the design of the bent flow channel 213 enables the coolant to generate turbulence during flow, breaking the boundary layer, enhancing heat transfer, and more effectively removing the heat generated by the battery cell. Moreover, this first channel 21 structure ensures uniform distribution of the coolant within the first channel 21, preventing localized overheating or insufficient cooling, and improving the temperature uniformity and stability of the entire energy storage device. Simultaneously, the bent flow channel 213 design provides additional structural support for the plastic plate 2, enhancing its overall mechanical strength and resistance to deformation, enabling it to better withstand coolant pressure and ensuring the stability and safety of the liquid cooling plate during long-term use.

[0045] It should be noted that the bent flow channel 213 can be provided with two straight sections 2131 and one bent section 2132, with the two straight sections 2131 connected by the bent section 2132. The bent flow channel 213 can also be provided with three straight sections 2131 and two bent sections 2132, or with n straight sections 2131 and n-1 bent sections 2132. This application does not limit this. In one embodiment of this application, the bent flow channel 213 includes three straight sections 2131 and two bent sections 2132. For details, please refer to further reading. Figure 4 Three straight sections 2131 are arranged alternately and parallel to each other along the first direction (i.e., the width direction of the plastic plate 2). The bent flow channel 213 adopts an S-shaped structure, which can significantly extend the flow path of the coolant in the first channel 21, thereby increasing the contact time and contact area between the coolant and the metal plate 1, and further improving the heat exchange efficiency. In addition, the S-shaped structure can also optimize the internal space utilization of the plastic plate 2, ensure the uniform distribution of coolant in the first channel 21, and enhance its mechanical strength and stability. This design not only improves the performance of the cooling system, but also takes into account structural strength and reliability, making it suitable for the cooling needs of high-performance energy storage devices.

[0046] In one embodiment of this application, the first channel 21 includes three sets of bent flow channels 213. For details, please refer to further reading. Figure 2 Three sets of bent flow channels 213 are arranged sequentially at intervals along the first direction, and do not interfere with each other. The inlet ends 2133 of the three sets of bent flow channels 213 are all connected to the inlet flow channel 211, and the outlet ends 2134 of the three sets of bent flow channels 213 are all connected to the outlet flow channel 212, and are discharged through the outlet pipe 4. This parallel connection ensures that the coolant can be evenly distributed to each set of bent flow channels 213, avoiding the problem of uneven coolant flow caused by unreasonable design of the first channel 21. Secondly, this layout can further increase the contact area and heat exchange time between the coolant and the metal plate 1, thereby significantly improving the cooling efficiency. In addition, the non-interference design of the three sets of bent flow channels 213 makes the flow of coolant in the first channel 21 smoother, reduces flow resistance, and reduces energy loss. At the same time, this layout can also enhance the overall structural strength of the plastic plate 2, enabling it to better withstand the pressure of the coolant and ensuring the stability and reliability of the liquid cooling plate in long-term use. The structure of the second channel 22 is the same as that of the first channel 21, and will not be described again here.

[0047] Furthermore, the three sets of bent flow channels 213 share the same inlet pipe 3 and the same outlet pipe 4, which reduces the number of inlet pipes 3 and outlet pipes 4, significantly simplifying the overall structure of the liquid cooling plate assembly 100, reducing the number of parts and connection points, thereby reducing production costs and assembly difficulty. At the same time, this design reduces the space occupied by the inlet pipes 3 and outlet pipes 4, making the liquid cooling plate assembly 100 more compact and facilitating installation and layout in limited spaces. Centralized management of the coolant inlet and outlet improves the overall efficiency and reliability of the cooling system, reduces the risk of leakage due to multiple connection points, and further enhances the sealing and stability of the liquid cooling plate assembly 100.

[0048] In another embodiment of this application, the plastic plate 2 has two first channels 21 as described above; specifically, please refer to further details. Figure 2 Two first channels 21 are respectively located on both sides of the inlet pipe 3 and outlet pipe 4 along the second direction (i.e., the length direction of the plastic plate 2). The inlet channels 211 of the two first channels 21 are connected to the same inlet pipe 3 for water intake, and the outlet channels 212 of the two first channels 21 are connected to the same outlet pipe 4 for water output. This allows the coolant to cover the entire area of ​​the plastic plate 2 more evenly, thereby achieving more efficient heat exchange. At the same time, this symmetrical dual-channel design can effectively balance the coolant pressure on both sides of the plastic plate 2, reducing the risk of structural deformation caused by uneven pressure, and further enhancing the stability and reliability of the liquid cooling plate.

[0049] In one embodiment of this application, to increase the structural strength of the plastic sheet 2 and improve its resistance to compression and impact, a structural groove 2c is provided on the side of the plastic sheet 2 facing away from the metal sheet 1. The structural groove 2c is formed by the first channel 21, and a plurality of reinforcing ribs 25 are provided inside the structural groove 2c. For details, please refer to further reference. Figure 3 The plastic sheet 2 and the reinforcing rib 25 are integrally molded using an injection molding process, which significantly enhances the overall structural strength of the plastic sheet 2, improves its resistance to pressure and impact, and enables it to better withstand the pressure of coolant and external mechanical impact, thereby extending its service life. At the same time, the integral molding process not only ensures a tight bond between the reinforcing rib 25 and the plastic sheet 2, avoiding the risk of structural loosening or leakage due to assembly, but also simplifies the production process, reduces manufacturing costs, and improves production efficiency.

[0050] Furthermore, the reinforcing rib 25 is in direct contact with the side facing away from the first channel 21. The coolant absorbing heat from the battery cell exchanges heat with the reinforcing rib 25, allowing heat to be dissipated into the air. The reinforcing rib 25 also functions as a heat dissipation fin, achieving air-assisted heat dissipation, which further optimizes the heat dissipation effect of the cooling system. By supplementing liquid cooling with air cooling, the overall heat dissipation efficiency is improved. Simultaneously, this heat dissipation method eliminates the need for additional heat dissipation equipment, reducing system complexity and cost. Moreover, the reinforcing rib 25 strengthens the structural strength of the plastic plate 2 while also providing heat dissipation, achieving dual optimization of structure and function, and improving the overall performance and reliability of the liquid-cooled plate assembly 100.

[0051] To secure the liquid-cooled plate assembly 100 to the battery cell, the metal plate 1 has at least two first mounting holes 1a, and the plastic plate 2 has at least two second mounting holes. For details, please refer to further documentation. Figure 1 Each first mounting hole 1a and a second mounting hole are coaxially arranged, with mounting components passing through the first mounting holes 1a and the second mounting holes. This arrangement ensures a secure connection between the liquid cooling plate assembly 100 and the battery cell, keeping the liquid cooling plate stable during operation and preventing displacement or loosening due to vibration or external forces, thereby guaranteeing the continuity and reliability of the cooling effect. Simultaneously, the coaxial mounting holes make the installation process more precise and convenient, reducing installation errors, improving assembly efficiency, and facilitating subsequent maintenance and replacement.

[0052] In one embodiment of this application, a thermally conductive adhesive is provided on the side of the metal plate 1 facing away from the plastic plate 2, and the metal plate 1 contacts the battery cell through the thermally conductive adhesive. The thermally conductive adhesive can fill the tiny gaps between the metal plate 1 and the battery cell, effectively reducing the contact thermal resistance, thereby improving the heat conduction efficiency and allowing the heat generated by the battery cell to be transferred to the metal plate 1 more quickly. At the same time, the thermally conductive adhesive also has a certain degree of flexibility, which can buffer the mechanical stress between the battery cell and the metal plate 1 to a certain extent, protecting the battery cell from the effects of vibration or impact, and further enhancing the contact stability and reliability between the liquid cooling plate assembly 100 and the battery cell.

[0053] This application also proposes an energy storage device, which includes a battery cell and a liquid cooling plate assembly 100 as described above. The specific structure of the liquid cooling plate assembly 100 is as described in the above embodiments. Since this energy storage device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A liquid-cooled plate assembly, characterized in that, The device includes a metal plate (1) and a plastic plate (2) stacked together. The plastic plate (2) has a first channel (21), a second channel (22), a water inlet (23), and a water outlet (24). The first channel (21) is located on the first side (2a) of the water inlet (23) and the water outlet (24), and the second channel (22) is located on the second side (2b) of the water inlet (23) and the water outlet (24). The water inlet of the first channel (21) and the water inlet of the second channel (22) are both connected to the water inlet (23), and the water outlet of the second channel (22) and the water outlet of the second channel (22) are both connected to the water outlet (24).

2. The liquid-cooled plate assembly as described in claim 1, characterized in that, The metal plate (1) is welded to the plastic plate (2).

3. The liquid-cooled plate assembly as described in claim 1, characterized in that, The first channel (21) includes an inlet channel (211), an outlet channel (212), and multiple bend channels (213). The inlet channel (211) is connected to the inlet interface (23), and the outlet channel (212) is connected to the outlet interface (24). Each of the bent flow channels (213) is located between the inlet flow channel (211) and the outlet flow channel (212). Each of the bent flow channels (213) has an inlet end (2133) and an outlet end (2134). The inlet end (2133) is connected to the inlet flow channel (211), and the outlet end (2134) is connected to the outlet flow channel (212).

4. The liquid-cooled plate assembly as described in claim 3, characterized in that, The bent flow channel (213) includes at least two straight sections (2131) and at least one bent section (2132). The at least two straight sections (2131) are spaced apart, and each pair of adjacent straight sections (2131) are connected by a bent section (2132).

5. The liquid-cooled plate assembly as described in claim 3, characterized in that, The bent flow channel (213) includes a first straight section (2131), a second straight section (2131) and a third straight section (2131) arranged in sequence at intervals. The first straight section (2131) has the water inlet end (2133). The end of the first straight section (2131) away from the water inlet end (2133) is connected to the second straight section (2131) through a first bent section (2132). The third straight section (2131) has a water outlet end (2134), and the end of the third straight section (2131) away from the water outlet end (2134) is connected to the end of the second straight section (2131) away from the first bending section (2132) through the second bending section (2132).

6. The liquid-cooled plate assembly as described in any one of claims 1 to 5, characterized in that, The metal plate (1) is made of aluminum or aluminum alloy.

7. The liquid-cooled plate assembly as described in any one of claims 1 to 5, characterized in that, The liquid cooling plate assembly also includes an inlet pipe (3) and an outlet pipe (4), the inlet pipe (3) and the outlet pipe (4) are disposed on the metal plate (1) or the plastic plate (2), the inlet pipe (3) is connected to the inlet interface (23), and the outlet pipe (4) is connected to the outlet interface (24).

8. The liquid-cooled plate assembly as described in any one of claims 1 to 5, characterized in that, The plastic plate (2) has a structural groove (2c) on the side facing away from the metal plate (1). The structural groove (2c) is formed by the first channel (21) and / or the second channel (22). The structural groove (2c) is provided with a plurality of reinforcing ribs (25).

9. The liquid-cooled plate assembly as described in any one of claims 1 to 5, characterized in that, The metal plate (1) is provided with at least two first mounting holes (1a), and the plastic plate (2) is provided with at least two second mounting holes (2d). Each first mounting hole (1a) and each second mounting hole (2d) are coaxially arranged, and mounting components are inserted through the first mounting holes (1a) and the second mounting holes (2d).

10. An energy storage device, characterized in that, include: At least two battery cells; In the liquid-cooled plate assembly as described in any one of claims 1 to 9, the side of the metal plate (1) facing away from the plastic plate (2) is in contact with the two battery cells respectively.

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