Liquid cooling device for energy storage battery pack

Abstract

The invention relates to an energy storage battery pack liquid cooling device which comprises a liquid cooling plate arranged at the bottom of an energy storage battery, two flow channels are symmetrically arranged in the liquid cooling plate, the head ends of the two flow channels are arranged in parallel and are communicated through a first confluence area, and the first confluence area is provided with an injection opening used for injecting cooling liquid. The tail ends of the two flow channels are communicated through a second confluence area, the second confluence area is provided with a discharging opening used for discharging cooling liquid, the middle section area of each flow channel is tightly arranged in a bent mode, a plurality of flow dividing structures are arranged in each flow channel, and each flow dividing structure divides the flow channel into a plurality of micro flow channels. According to the liquid cooling plate, the two flow channels are connected in parallel, the flowing distance of cooling liquid in a pipeline network is reduced, the heat exchange time of the cooling liquid is shortened, and the heat uniformity of the liquid cooling plate is remarkably improved in cooperation with the micro-flow channels formed by the flow dividing structures.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a liquid cooling device for an energy storage battery pack. Background Technology

[0002] New energy storage batteries are batteries that can store electrical energy for use when needed. These batteries offer advantages such as high energy density, long lifespan, environmental friendliness, and high safety, and are gradually replacing traditional fossil fuels, finding widespread application in various energy storage systems and devices. Among these, battery energy storage systems (BESS) balance energy supply and storage, improving grid flexibility and thus becoming a primary solution for grid energy storage.

[0003] However, the charging and discharging of lithium batteries involves complex physical and electrochemical processes and is highly sensitive to heat. Excessive temperature not only affects the performance and lifespan of the battery itself, but is also detrimental to safe use. In particular, thermal runaway (TR) of batteries can cause explosions and fires, which is one of the main causes of safety accidents in energy storage systems.

[0004] In existing technologies, heat dissipation of energy storage batteries is usually achieved through air cooling and liquid cooling. Air cooling has the disadvantages of large heat generation and limited heat dissipation space when applied to large-scale energy storage systems. Liquid cooling, on the other hand, usually involves placing a liquid cooling plate on the side of the energy storage battery and pumping coolant into the flow channels of the liquid cooling plate to remove the heat from the energy storage battery. However, uneven flow distribution within the flow channels causes the coolant temperature to rise during the flow process, resulting in a decrease in cooling performance and affecting the overall heat dissipation performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a liquid cooling device for energy storage battery packs that has good heat dissipation effect and can ensure uniform heat dissipation.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A liquid cooling device for an energy storage battery pack includes a liquid cooling plate placed at the bottom of the energy storage battery. The liquid cooling plate has two flow channels symmetrically arranged inside. The first ends of the two flow channels are arranged side by side and connected through a first confluence area. The first confluence area is provided with an injection port for injecting coolant. The tail ends of the two flow channels are connected through a second confluence area. The second confluence area is provided with an outlet for discharging coolant. The middle section of each flow channel is tightly and curvedly arranged. Each flow channel has a multi-component flow structure inside, and each component flow structure divides the flow channel into multiple micro-channels.

[0007] The beneficial effects of this invention are: the two flow channels are connected through the first and second confluence areas corresponding to their head and tail ends, respectively, so that the two flow channels are connected in parallel, which effectively reduces the flow distance of the coolant in the pipeline network and shortens the time for the coolant to exchange heat. In addition, the microchannels formed by the diversion structure significantly improve the heat uniformity of the liquid cooling plate and increase the temperature distribution uniformity of the energy storage battery it carries.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, within the same flow channel, at least two flow branch structures are arranged at intervals; all flow branch structures in the two flow channels form a symmetrical structure.

[0010] The beneficial effect of adopting the above-mentioned further scheme is that the adjacent two-component flow structures are set at intervals, which promotes the turbulence of the coolant by the convergence and separation of the coolant between the adjacent flow structures, thereby improving the overall cooling effect and significantly improving the performance and thermal management function of the liquid cooling plate.

[0011] Furthermore, each flow channel has a flow diversion structure at its turning area, and the turning areas of the micro-flow channels and the flow channels are connected by rounded corners.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the use of rounded corners at the corners of the flow channel and microchannel effectively reduces flow separation losses and improves system efficiency.

[0013] Furthermore, each flow distribution structure includes multiple parallel flow dividers, and the gap between two adjacent flow dividers forms a microchannel.

[0014] The advantages of adopting the above-mentioned further solution are that the microchannel formation structure is relatively simple, which can effectively and uniformly distribute heat and has the advantages of low cost. At the same time, the collision between the coolant and the wall of the distributor plate leads to the destruction of the thermal boundary layer and the formation of turbulence, which enhances the mixing and heat exchange efficiency of the coolant, thereby more effectively removing the heat of the energy storage battery placed on top of the liquid cooling system.

[0015] Furthermore, the flow divider plate is strip-shaped along the flow direction of the channel, and the cross-section of the flow divider plate is U-shaped.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that the U-shaped manifold can increase the contact surface between the coolant and the manifold, further enhancing the mixing and heat exchange rate of the coolant.

[0017] Furthermore, each component flow structure forms multiple microchannels, including wide microchannels and narrow microchannels. The wide microchannels are located at the two sides of each component flow structure, and the narrow microchannels are located in the middle of each component flow structure.

[0018] The beneficial effect of adopting the above-mentioned further scheme is that by using microchannels of varying widths, the resistance of the wide microchannels is increased and the resistance of the narrow microchannels is reduced, allowing coolants with different flow rates to pass through microchannels of varying widths, thereby increasing local heat exchange capacity, specifically alleviating the heat accumulation phenomenon of the energy storage battery in this area, reducing flow dead zones, and thus enhancing the mixing efficiency of the coolant.

[0019] Within the same flow channel, in at least two adjacent flow structures, one flow structure forms multiple wide microchannels, and the other flow structure forms multiple narrow microchannels.

[0020] The beneficial effect of adopting the above-mentioned further scheme is that by setting microchannels of varying widths, the coolant can be evenly distributed and exchanged at this location, reducing the dead zone of the flow field and thus reducing flow separation losses.

[0021] Furthermore, the beginning and end of the same flow channel are arranged side by side, with the beginning of the two flow channels located between the end of the two flow channels, and the second confluence area is arranged around the outside of the first confluence area.

[0022] The beneficial effect of adopting the above-mentioned further scheme is that the first and second flow junctions are adjacent, which can shorten the flow distance of the coolant in the pipeline network and enable a certain degree of heat exchange between the first and second flow junctions, further improving uniformity.

[0023] Furthermore, it also includes a thermal pad located on the top surface of the liquid cooling plate and the bottom of the energy storage battery.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the thermal pad can accelerate the heat exchange between the energy storage battery and the liquid cooling plate, and improve the heat dissipation effect.

[0025] Furthermore, the liquid cooling plate includes a top plate and a bottom plate spaced apart from each other, two flow channels are fixed between the top plate and the bottom plate, and the coolant injection port and discharge port are opened at the position of the top plate near the edge; the top surface of the top plate is provided with a pair of positioning blocks, and a positioning groove for limiting the energy storage battery is formed between the pair of positioning blocks.

[0026] The advantages of adopting the above-mentioned further solution are that the flow channel is installed between the top plate and the bottom plate, which helps to ensure sealing and effectively prevent coolant leakage. At the same time, the positioning block can provide additional mechanical support, enhance the stability of the overall structure, and reduce the risk of loosening caused by vibration or thermal expansion and contraction. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the interaction between the energy storage battery and the liquid cooling plate in this invention. Figure 2 This is an exploded view of the liquid cooling plate in this invention; Figure 3 This is a schematic diagram of the flow direction of the two flow channels in this invention; Figure 4 This is a schematic diagram of the structure of the base plate in this invention; Figure 5 This is a schematic diagram of the flow splitting structure in this invention; Figure 6 This is a cross-sectional view of the wide microchannel and the narrow microchannel in this invention; The attached diagram lists the components represented by each number as follows: 1. Top plate; 11. Inlet; 12. Outlet; 13. Positioning block; 131. Positioning groove; 2. Bottom plate; 3. Flow channel; 31. Head end; 32. Tail end; 33. First confluence area; 34. Second confluence area; 35. Inlet flow channel; 36. Outlet flow channel; 4. Diversion structure; 41. Microchannel; 42. Wide microchannel; 43. Narrow microchannel; 44. Inner microchannel; 45. Outer microchannel; 46. Diversion plate; 5. Energy storage battery. Detailed Implementation

[0028] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] Example 1 This embodiment provides a liquid cooling device for a 5-pack of energy storage batteries, including a liquid cooling plate placed at the bottom of the energy storage battery 5. The liquid cooling plate has two flow channels 3 symmetrically arranged inside. The first ends 31 of the two flow channels 3 are arranged side by side and connected through a first confluence area 33. The first confluence area 33 is provided with an inlet 11 for injecting coolant. The tail ends 32 of the two flow channels 3 are connected through a second confluence area 34. The second confluence area 34 is provided with an outlet 12 for discharging coolant. The middle section of each flow channel 3 is tightly and tortuously arranged. Each flow channel 3 has a multi-component flow structure 4 inside, and each component flow structure 4 divides the flow channel 3 into multiple micro-channels 41.

[0030] In this embodiment, the two flow channels 3 are connected by the first confluence area 33 and the second confluence area 34 corresponding to their head end 31 and tail end 32, respectively, so that the two flow channels 3 are connected in parallel, which effectively reduces the flow distance of the coolant in the pipeline network and shortens the time for the coolant to exchange heat. In addition, the microchannel 41 formed by the diversion structure 4 significantly improves the heat uniformity of the liquid cooling plate and increases the temperature distribution uniformity of the energy storage battery 5 it carries.

[0031] Specifically, such as Figure 1 , 2As shown, the liquid cooling plate is a plate with a certain thickness. Two flow channels 3 are symmetrically arranged inside the liquid cooling plate. The beginning 31 and end 32 of each flow channel 3 extend along the length of the liquid cooling plate. The middle section of each flow channel 3 is curved and seamlessly arranged, forming a dense curved structure, allowing heat conduction to the sidewalls of the flow channels 3. Preferably, the extension direction of the middle section of the flow channel 3 is basically the length and width direction of the liquid cooling plate, making the flow channels 3 straight. This not only extends the length of each flow channel 3 in a limited space but also improves heat uniformity and heat transfer efficiency. The beginning 31s of the two flow channels 3 are arranged side-by-side and connected through a first confluence area 33, which extends along the width direction of the liquid cooling plate. The first confluence area 33 is provided with an inlet 11 for injecting coolant. Preferably, the inlet 11... The distance between the two flow channels 3 and their starting ends 31 is equal, which facilitates the rapid flow of coolant into the two flow channels when injected. This allows the coolant to flow in parallel through the two flow channels 3 in the liquid cooling plate. Compared to the method of having only one flow channel 3 to allow the coolant to flow from the starting end 31 to the ending end 32, the flow distance of the coolant is shortened. The ending ends 32 of the two flow channels 3 are connected through a second confluence area 34. The second confluence area 34 is provided with an outlet 12 for discharging coolant. Preferably, the distance between the outlet 12 and the ending ends 32 of the two flow channels 3 is equal, so that the coolant in the two flow channels 3 can fully merge again in the second confluence area 34 before being discharged, ensuring the heat uniformity of the liquid cooling plate. That is, the inlet 11 and the outlet 12 are arranged along the axis of symmetry of the two flow channels 3, which can effectively reduce the pressure drop between the inlet 11 and the outlet 12.

[0032] In this embodiment, each flow channel 3 is bent into a serpentine shape, and each flow channel 3 mainly extends in the length direction, thereby reducing the number of turns in the flow channel 3. Of course, in other embodiments, each flow channel 3 may also mainly extend in the width direction of the liquid cooling plate, but the number of turns in the flow channel 3 will increase.

[0033] Of course, as another embodiment, the injection port 11 can also be more biased toward the beginning end 31 of one of the flow channels 3, and correspondingly, the discharge port 12 can also be more biased toward the end end 32 of one of the flow channels 3. By changing the distance between the injection port 11 and the two beginning ends 31 (changing the distance between the discharge port 12 and the two end ends 32), the time for the coolant to be injected (discharged) into the two flow channels 3 can be adjusted. At this time, the two flow channels 3 can be specifically distinguished as the inlet flow channel 35 and the outlet flow channel 36, wherein the distance between the beginning end 31 of the inlet flow channel 35 and the injection port 11 is smaller.

[0034] In this embodiment, each flow channel 3 is provided with a multi-component flow structure 4. Each component flow structure 4 is arranged according to the extension direction of the flow channel 3, and each component flow structure 4 divides the flow channel 3 into multiple micro-channels 41. The formation of multiple micro-channels 41 within the flow channel 3 can effectively increase the unit heat exchange area of ​​the liquid cooling plate, improve the heat exchange capacity and heat uniformity, such as... Figure 2 As shown, each flow distribution structure 4 is rectangular in shape and located in the middle of the flow channel 3, leaving a gap between each flow distribution structure 4 and the two side walls of the flow channel 3. This gap can also serve as a microchannel 41. Furthermore, in the same flow distribution structure 4, the width of each microchannel 41 can be equal or not completely equal, as long as the width of each microchannel 41 is less than or equal to 5mm.

[0035] Example 2 Based on Example 1, at least two branch flow structures 4 are arranged at intervals within the same flow channel 3; all branch flow structures 4 of the two flow channels 3 form a symmetrical structure. In this way, the interval arrangement of adjacent branch flow structures 4 promotes the turbulence of the coolant by merging and separating the coolant between adjacent branch flow structures 4, thereby improving the overall cooling effect and significantly enhancing the performance and thermal management function of the liquid cooling plate.

[0036] Specifically, such as Figure 2 As shown, on the same flow channel 3, two adjacent flow branching structures 4 are spaced apart along the length of the liquid cooling plate. Preferably, the spacing between two adjacent flow branching structures 4 remains the same. In this embodiment, multiple sets of identical flow branching structures 4 are provided within the flow channel 3 extending along the length of the liquid cooling plate. Figure 2 , 4 In configuration 5, the overall flow-dividing structure 4 is rectangular, and the interval length between two adjacent flow-dividing structures 4 is less than or equal to the length of each flow-dividing structure 4. Preferably, the interval length is half the length of the flow-dividing structure 4. The flow of coolant between the flow channel 3 and the microchannel 41 allows the coolant to collide with the walls of the flow-dividing structure 4 and the flow channel 3, disrupting the thermal boundary layer and increasing convective heat transfer. At the same time, during the flow process, the merging and separation of fluid between adjacent flow-dividing structures 4 promotes turbulence of the coolant, thereby improving the overall cooling effect and significantly enhancing the performance and thermal management function of the coolant.

[0037] Furthermore, in this embodiment, the gaps on both sides of each flow structure 4 are divided into an inner microchannel 44 and an outer microchannel 45, wherein the inner microchannel 44 is located on the side away from the edge of the hydraulic plate, and the outer microchannel 45 is located on the side close to the edge of the hydraulic plate.

[0038] Example 3 Based on the embodiment, each flow channel 3 has a flow diversion structure 4 at its turning area, and the turning areas of the micro-channel 41 and the flow channel 3 are connected by rounded corners. In this way, the rounded corner treatment at the corners of the flow channel 3 and the micro-channel 41 effectively reduces flow separation losses and improves system efficiency.

[0039] In this embodiment, the middle section of each flow channel 3 mainly extends along the length of the liquid cooling plate, which helps to reduce the turning area of ​​the flow channel 3. Each flow channel 3 has at least two sets of interconnected diversion structures 4 in the turning area. Specifically, each flow channel 3 has one set of diversion structures 4 extending along the length direction and one set of diversion structures 4 extending along the width direction. The diversion structure 4 is L-shaped, and there is a gap between the diversion structures 4 of the two turning areas in the width direction of the liquid cooling plate. When the distance between two adjacent turning areas in the same flow channel 3 is small, the diversion structures 4 of the two turning areas can be connected together to form a U-shaped diversion structure 4.

[0040] Furthermore, the turning areas of microchannel 41 and channel 3 are connected by rounded corners, which effectively reduces flow separation losses and improves system efficiency.

[0041] Example 4 Based on the above embodiments, each flow distribution structure 4 includes multiple parallel flow distribution plates 46, and the gap between two adjacent flow distribution plates 46 forms a microchannel 41. Thus, the formation structure of the microchannel 41 is relatively simple, which can effectively distribute heat and has the advantages of low cost. At the same time, the collision between the coolant and the wall of the flow distribution plate 46 leads to the destruction of the thermal boundary layer and the formation of turbulence, which enhances the mixing and heat exchange efficiency of the coolant, thereby more effectively removing the heat of the energy storage battery 5 placed on top of the liquid cooling system.

[0042] In this embodiment, the protruding height of the flow divider plate 46 in each flow divider structure 4 is equal to the protruding height of the flow channel 3, which facilitates the formation of a sealed space and prevents coolant leakage.

[0043] Example 5 Based on Example 4, the manifold 46 is strip-shaped along the flow direction of the flow channel 3, and the cross-section of the manifold 46 is U-shaped. In this way, the U-shaped manifold 46 can increase the contact surface between the coolant and the manifold 46, further enhancing the mixing and heat exchange rate of the coolant.

[0044] Specifically, such as Figure 2 , 4As shown in Figure 5, each flow distribution structure 4 includes multiple parallel flow distribution plates 46, forming microchannels 41 between adjacent flow distribution plates 46. Preferably, each flow distribution plate 46 is bent into a U-shape, so that the hollow area of ​​the U-shaped flow distribution plate 46 can also serve as a microchannel 41. Thus, the hollow area of ​​each flow distribution plate 46 itself, as well as the gap between adjacent flow distribution plates 46, can all form microchannels 41, allowing as many microchannels 41 as possible to be formed within a limited space. Of course, multiple flow distribution plates 46 can be formed by bending a single plate multiple times.

[0045] Example 6 Based on the above embodiments, each flow distribution structure 4 forms multiple microchannels 41, including wide microchannels 42 and narrow microchannels 43. The wide microchannels 42 are located at the two sides of each flow distribution structure 4, and the narrow microchannels 43 are located in the middle of each flow distribution structure 4. In this embodiment, microchannels 41 of different widths are used, wherein the resistance of the wide microchannels 42 is increased and the resistance of the narrow microchannels 43 is reduced, so that coolants with different flow rates pass through microchannels 41 of different widths, which increases the local heat exchange capacity, specifically alleviates the heat accumulation phenomenon of the energy storage battery 5 in this area, reduces the flow dead zone, and thus enhances the mixing efficiency of the coolant.

[0046] Specifically, such as Figure 2 , 4 As shown in Figure 5, multiple microchannels 41 of different widths are formed in the same flow distribution structure 4. Among them, in the direction perpendicular to the coolant flow direction, that is, in the width direction of the liquid cooling plate, the microchannels 41 with larger widths are wide microchannels 42, and the microchannels 41 with smaller widths are narrow microchannels. All wide microchannels 42 have the same width, and all narrow microchannels 43 have the same width. Preferably, the width of the narrow microchannels 43 is half the width of the wide microchannels 42.

[0047] Of course, as in other embodiments, in the same flow splitting structure 4, the widths of all the wide microchannels 42 may not be exactly equal. For example, the width of all the wide microchannels 42 on the side of the narrow microchannel 43 gradually increases as the distance between them and the narrow microchannel 43 increases. The wide microchannel 42 located on the outermost side has the largest width, which is 5 mm. Preferably, the width of the wide microchannel 42 located on the outermost side is twice the width of the narrow microchannel 43.

[0048] Example 7 Based on the above embodiments, within the same flow channel 3, in two adjacent flow structures 4, one flow structure 4 forms multiple wide microchannels 42, and the other flow structure 4 forms multiple narrow microchannels 43. In this embodiment, by setting microchannels 41 of varying widths, the coolant can be evenly distributed and exchanged here, reducing the dead zone of the flow field and thus reducing flow separation losses.

[0049] In this embodiment, within the same flow channel 3, all flow splitting structures 4 are divided into two types: wide microchannels 42 and narrow microchannels 43. The wide microchannels 42 and narrow microchannels 43 are staggered. During the flow process, the coolant is more evenly distributed and exchanged in this area, reducing the dead zone of the flow field and thus reducing the separation loss of the flow. At the same time, the collision with the wall of the flow splitting plate 46 leads to the destruction of the thermal boundary layer and the formation of turbulence, which enhances the mixing and heat exchange efficiency of the coolant.

[0050] Example 8 Based on the above embodiment, the first end 31 and the last end 32 of the same flow channel 3 are arranged side by side, with the first end 31 of the two flow channels 3 located between the last ends 32 of the two flow channels 3. The second confluence area 34 is arranged around the outside of the first confluence area 33. In this embodiment, the first confluence area 33 and the second confluence area 34 are adjacent, which can shorten the flow distance of the coolant in the pipe network and enable a certain degree of heat exchange between the first confluence area 33 and the second confluence area 34, further improving uniformity.

[0051] like Figure 2 , 4 As shown in Figure 5, the beginning end 31 and the end end 32 of the same flow are arranged side by side, and the ends of the beginning end 31 and the end end 32 are kept flush and each is provided with a diversion structure 4. The beginning end 31 of the two flow channels 3 is located between the end ends 32 of the two flow channels 3. The beginning ends 31 of the two flow channels 3 are connected through the first confluence area 33, and the end ends 32 of the two flow channels 3 are connected through the second confluence area 34. The second confluence area 34 is arranged around the first confluence area 33. When the coolant is injected, the coolant first enters the two flow channels 3 through the diversion structure 4 of the beginning end 31. After the coolant flows fully in its respective flow channel 3, it enters the second confluence area 34 through the diversion structure 4 of the end end 32, and finally is discharged through the outlet 12.

[0052] Example 9 Based on the above embodiments, the liquid cooling device also includes a thermal pad, which is located on the top surface of the liquid cooling plate and the bottom of the energy storage battery 5. In this way, the thermal pad can accelerate the heat exchange between the energy storage battery 5 and the liquid cooling plate and improve the heat dissipation effect.

[0053] In other embodiments, the thermal pad can be omitted, allowing the energy storage battery 5 to directly contact the liquid cooling plate.

[0054] Example 10 Based on the above embodiment, the liquid cooling plate includes a top plate 1 and a bottom plate 2 spaced apart from each other. Two flow channels 3 are fixed between the top plate 1 and the bottom plate 2. The coolant inlet 11 and outlet 12 are opened at the position of the top plate 1 near the edge. A pair of positioning blocks 13 are provided on the top surface of the top plate 1. A positioning groove 131 for limiting the energy storage battery 5 is formed between the pair of positioning blocks 13. In this embodiment, the flow channels 3 are installed between the top plate 1 and the bottom plate 2, which helps to ensure sealing and effectively prevent coolant leakage. At the same time, the positioning blocks 13 can provide additional mechanical support, enhance the stability of the overall structure, and reduce the risk of loosening caused by vibration or thermal expansion and contraction.

[0055] Specifically, such as Figure 2 As shown, the liquid cooling plate includes a top plate 1 and a bottom plate 2 of the same shape. Figure 2 Both the top plate 1 and the bottom plate 2 are rectangular. A confluence area is formed by protruding outward from the same short edge of the top plate 1 and the bottom plate 2. The confluence area is divided into a first confluence area 33 and a second confluence area 34. The flow direction of the first confluence area 33 and the second confluence area 34 is the width direction. The two flow channels 3 and the flow-dividing structure 4 in each flow channel 3 are set on the bottom plate 2. The first ends 31 of the two flow channels 3 are connected to the two ends of the first confluence area 33, and the tail ends 32 of the two flow channels 3 are connected to the two ends of the second confluence area 34.

[0056] In this embodiment, the top plate 1, bottom plate 2, two flow channels 3, and flow divider plates 46 in each flow divider structure 4 are all fixed together by brazing, thereby ensuring the formation of a well-sealed liquid cooling plate and preventing coolant leakage. Furthermore, several screws and nuts are installed on the edges of the top plate 1 and the bottom plate 2 to further ensure the connection between the top plate 1 and the bottom plate 2. The coolant inlet 11 and outlet 12 are both located near the edge of the top plate 1, wherein the inlet 11 is connected to the first confluence area 33 and the outlet 12 is connected to the second confluence area 34.

[0057] A pair of positioning blocks 13 are provided on the top surface of the top plate 1. Figure 2 In this embodiment, each positioning block 13 is a strip-shaped protrusion extending along the width of the top plate 1. Each of the two positioning blocks 13 has a positioning groove 131 on one opposite side. This positioning groove 131 is used to engage the bottom edge of the energy storage battery 5. When a thermally conductive pad is provided between the energy storage battery 5 and the liquid cooling plate, the bottom of the energy storage battery 5 is mounted above the thermally conductive pad, and the two side edges of the bottom of the energy storage battery 5 can abut against the positioning groove 131. The positioning block 13 provides additional mechanical support for the liquid cooling plate, enhancing the stability of the overall structure and reducing the risk of loosening due to vibration or thermal expansion and contraction. In this embodiment, the positioning block 13 can be fixedly connected to the top plate 1 using screws, nuts, or other threaded connections.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A liquid cooling device for an energy storage battery pack, characterized in that, The system includes a liquid cooling plate placed at the bottom of the energy storage battery (5). The liquid cooling plate has two symmetrically arranged flow channels (3) inside. The first ends (31) of the two flow channels (3) are arranged side by side and connected through a first confluence area (33). The first confluence area (33) is provided with an inlet (11) for injecting coolant. The tail ends (32) of the two flow channels (3) are connected through a second confluence area (34). The second confluence area (34) is provided with an outlet (12) for discharging coolant. The middle section of each flow channel (3) is arranged in a tight and curved manner. Each flow channel (3) has a multi-component flow structure (4) inside. Each component flow structure (4) divides the flow channel (3) into multiple micro-channels (41).

2. The liquid cooling device for an energy storage battery pack according to claim 1, characterized in that, Within the same flow channel (3), at least two flow branch structures (4) are arranged at intervals; all flow branch structures (4) of the two flow channels (3) form a symmetrical structure.

3. The liquid cooling device for an energy storage battery pack according to claim 1, characterized in that, Each flow channel (3) has a flow splitting structure (4) in its turning area, and the turning areas of the micro-flow channel (41) and the flow channel (3) are connected by rounded corners.

4. The liquid cooling device for an energy storage battery pack according to claim 3, characterized in that, Each flow distribution structure (4) includes multiple parallel flow dividers (46), and the gap between two adjacent flow dividers (46) forms a microchannel (41).

5. The liquid cooling device for an energy storage battery pack according to claim 4, characterized in that, The flow divider (46) is strip-shaped along the flow direction of the flow channel (3), and the cross section of the flow divider (46) is U-shaped.

6. The liquid cooling device for an energy storage battery pack according to claim 5, characterized in that, Each flow structure (4) forms multiple microchannels (41) including wide microchannels (42) and narrow microchannels (43), wherein the wide microchannels (42) are located at the two sides of each flow structure (4) and the narrow microchannels (43) are located in the middle of each flow structure (4).

7. The liquid cooling device for an energy storage battery pack according to claim 5, characterized in that, Within the same flow channel (3), in two adjacent flow structures (4), one flow structure (4) forms multiple wide microchannels (42), and the other flow structure (4) forms multiple narrow microchannels (43).

8. The liquid cooling device for an energy storage battery pack according to claim 1, characterized in that, The first end (31) and the last end (32) of the same flow channel (3) are arranged side by side, the first end (31) of the two flow channels (3) is located between the last end (32) of the two flow channels (3), and the second confluence area (34) is arranged around the outside of the first confluence area (33).

9. A liquid cooling device for an energy storage battery pack according to claim 1, characterized in that, It also includes a thermal pad located between the top surface of the liquid cooling plate and the bottom of the energy storage battery (5).

10. The liquid cooling device for an energy storage battery pack according to claim 1, characterized in that, The liquid cooling plate includes a top plate (1) and a bottom plate (2) spaced apart from each other. Two flow channels (3) are fixed between the top plate (1) and the bottom plate (2). The coolant inlet (11) and outlet (12) are opened on the top plate (1) near the edge. The top surface of the top plate (1) is provided with a pair of positioning blocks (13), and a positioning groove (131) for limiting the energy storage battery (5) is formed between the pair of positioning blocks (13).

Images