A flat heat pipe for heat dissipation of battery stacks

Abstract

This invention relates to the field of battery stack heat dissipation, and particularly to a flat plate heat pipe for battery stack heat dissipation. It includes a protective box with symmetrically distributed limiting frames on the bottom wall of the box. Several battery stacks are placed on the bottom wall of the protective box, separated by two limiting frames and evenly distributed along the corresponding limiting frames. A heat-conducting unit for absorbing heat from the battery stacks is also provided between the two limiting frames. The uniquely designed flat plate heat pipe ensures heat transfer from the battery stacks while also meeting the requirements of a small space, providing a possibility for battery heat dissipation in small-space battery stacks. The inclined arrangement of microchannels inside the flat plate heat pipe provides power for vapor transport and liquid reflux. The microgroove structure and capillary wick within each microchannel provide capillary force, enhancing the disturbance of the internal working fluid, strengthening heat exchange, and improving heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery stack heat dissipation, and particularly to a flat plate heat pipe for battery stack heat dissipation. Background Technology

[0002] With the continuous development of technology, battery stacks are being used more and more widely in various fields, such as electric vehicles and energy storage systems. To improve the energy density of battery stacks, the volume of individual battery cells is becoming smaller and their power output is increasing, which leads to a sharp increase in heat generated per unit volume. If heat dissipation is not timely and effective, it will affect battery performance, lifespan, and even safety. Traditional heat dissipation and temperature control methods mainly include two types: First, indirect cooling using a cold plate radiator. This method mainly uses circulating coolant to remove the heat generated by the battery cell through a bottom cold plate radiator. However, the heat-generating part of the battery cell is mainly in the upper part, resulting in a large temperature difference between the top and bottom, making it only suitable for low-rate applications. Second, many manufacturers and research institutions are currently focusing on immersion cooling to meet the requirements of higher charging rates. This involves immersing the battery cell in coolant for cooling. This places high demands on the insulation, safety, and compatibility of the immersion coolant, and has disadvantages such as high cost and high safety risks. In summary, existing heat dissipation methods are insufficient to meet diverse heat dissipation needs, requiring more efficient heat dissipation technologies.

[0003] Flat plate heat pipes, as a highly efficient heat dissipation technology, possess advantages such as high heat dissipation performance, good temperature uniformity, compact structure, and high reliability, and are widely used in battery stack heat dissipation. They can quickly conduct heat generated by the battery stack away, achieving uniform heat dissipation. Their flat structure also allows them to better adapt to the shape of the battery stack, facilitating installation and integration. Simultaneously, flat plate heat pipes also offer advantages such as light weight, high reliability, and no moving parts, meeting the specific requirements of battery stack heat dissipation. CN115189070A discloses a flat plate heat pipe for power batteries, which uses a flow guide to direct the flow of coolant in the storage tank to vaporize the coolant. However, this flat plate heat pipe occupies a large area, making it difficult to achieve heat dissipation in battery stacks with space constraints. Furthermore, since the sides of the battery stack are not flat, the plate cannot completely conform to the plane of the battery stack, resulting in low heat dissipation efficiency.

[0004] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing flat plate heat pipes. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a flat heat pipe for heat dissipation of battery stacks, comprising a protective box, symmetrically distributed limiting frames on the bottom wall of the protective box, several battery stacks placed on the bottom wall of the protective box, the battery stacks being separated by two limiting frames and evenly distributed along the corresponding limiting frames, and a heat-conducting unit for absorbing heat from the battery stacks being provided between the two limiting frames.

[0006] The heat-conducting unit includes a rectangular plate disposed on one side of the battery stack. A rectangular groove is formed on the side of the rectangular plate facing the battery stack, and a heat-conducting silicon pad that contacts the outside of the battery stack is disposed in the rectangular groove.

[0007] Preferably, a flat plate hot plate is provided on the side of the rectangular plate away from the battery stack. The flat plate hot plate has a hollow interior and several baffles with inclined angles are provided inside the flat plate hot plate. The baffles divide the hollow area of ​​the flat plate hot plate into several microchannels.

[0008] Preferably, several micro-wings are provided in several micro-channels, and the micro-wings extend along the inclined direction of the corresponding partition, with the spacing between the micro-wings forming micro-grooves.

[0009] Preferably, the inner wall of the microchannel is also provided with a wire mesh liquid-absorbing core or powder sintering.

[0010] Preferably, a cooling unit for cooling the flat plate is also provided on one side of the hot plate. The cooling unit includes a cooling plate installed on one side of the hot plate, and the cooling plate is L-shaped to accommodate the battery stack. The cooling plate has flow channels inside.

[0011] Preferably, the flow channels are distributed in a U-shape, and the two ends of the flow channels penetrate to the outer wall of the cooling plate to form an inlet and an outlet, respectively. Cooling water enters the flow channel through the inlet and then flows out of the flow channel through the outlet.

[0012] Preferably, thermal grease is applied between the cooling plate and the rectangular plate.

[0013] Preferably, a side box is provided through one side of the protective box, and a circulation unit for supplying cooling water to the cooling plate is provided inside the side box. The circulation unit includes limiting plates symmetrically arranged on the inner walls of both sides of the side box. Several sliding plates corresponding to the cooling plates are slidably arranged between the limiting plates. Water inlet pipe and water outlet pipe are provided between the sliding plates and the water inlet and outlet on the corresponding cooling plate.

[0014] Preferably, a water pump is also provided on the inner wall of the side box, and two connecting pipes are symmetrically arranged on one side of the sliding plate and are connected to the corresponding water inlet pipe and water outlet pipe, and the other side of the connecting pipe is connected to the water pump.

[0015] Preferably, the connecting pipe is made of a stretchable material.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] I. This invention, through its uniquely designed flat plate heat pipe, can ensure heat transfer in the battery stack while also meeting the requirements of the small space of the battery stack, providing a possibility for heat dissipation of batteries in small space battery stacks; the inclined arrangement of microchannels inside the flat plate heat pipe provides power for the transmission of vapor and the reflux of liquid, and the microgroove structure and capillary wick in each microchannel can provide capillary force, enhance the disturbance of the internal working fluid, strengthen heat exchange, and improve heat exchange efficiency.

[0018] Second, the loop-shaped flow channels of the cooling plate in this invention arrange the hot and cold fluid channels in an alternating pattern, making the temperature of each part of the cooling plate similar and avoiding the consequences of localized high temperatures, resulting in better temperature uniformity. At the same time, due to its regular layout, it is also more convenient to process. Furthermore, by setting a side box on one side of the protective box and setting a circulation unit in the side box, continuous circulation of cooling water is realized, ensuring that the cooling water is always kept at a suitable temperature. This ensures that the heat conduction unit in this invention can continuously absorb the heat generated by the battery stack, ensuring that the battery stack can operate within a reasonable temperature range.

[0019] Third, by setting up a movable translation unit and a limiting component, this invention realizes the replacement of battery stacks and ensures the safety of the equipment. The translation unit can drive the flat hot plate to move, clearing the installation and disassembly area for the battery stack, which facilitates the installation and replacement of the battery stack. The limiting component limits the sealing plate to prevent it from falling off, further improving the safety of the battery stack. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0022] Figure 2 This is a cross-sectional structural diagram of the protective box of the present invention.

[0023] Figure 3 This is a schematic diagram of the limiting frame of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the heat conduction unit and cooling unit of the present invention.

[0025] Figure 5 This is a schematic diagram of the rectangular groove and thermally conductive silicon pad of the present invention.

[0026] Figure 6 This is a cross-sectional view of the flat hot plate of the present invention.

[0027] Figure 7This is a planar sectional view of the flat plate hot plate of the present invention.

[0028] Figure 8 This is a schematic diagram of the wire mesh liquid-absorbing core of the present invention.

[0029] Figure 9 This is a schematic diagram of the powder sintering process of the present invention.

[0030] Figure 10 This is a schematic diagram of the cooling unit of the present invention.

[0031] Figure 11 This is a planar sectional view of the cooling unit of the present invention.

[0032] Figure 12 This is a schematic diagram of the structure of the loop unit of the present invention.

[0033] Figure 13 This is the present invention. Figure 12 Enlarged view of part of the structure at point A in the middle.

[0034] Figure 14 This is a schematic diagram of the sealing component of the present invention.

[0035] Figure 15 This is a schematic diagram of the translation unit of the present invention.

[0036] Figure 16 This is a planar sectional view of the translation unit of the present invention.

[0037] Figure 17 This is a schematic diagram of the structure of the limiting component of the present invention.

[0038] Figure 18 This is the present invention. Figure 17 Enlarged view of part of the structure at point B.

[0039] In the diagram, 1. Protective box; 10. Limiting frame; 11. Battery stack; 2. Thermal conductive unit; 20. Rectangular plate; 21. Rectangular groove; 22. Thermal conductive silicon pad; 23. Flat hot plate; 24. Separator; 25. Microchannel; 26. Microfin; 27. Microgroove; 3. Wire mesh liquid wick; 30. Powder sintering; 4. Cooling unit; 40. Cooling plate; 41. Flow channel; 42. Inlet; 43. Outlet; 5. Circulation unit; 50. Side box; 51. Limiting plate; 5 2. Sliding plate; 53. Inlet pipe; 54. Outlet pipe; 55. Water pump; 56. Connecting pipe; 6. Sealing assembly; 60. Insertion slot; 61. Sealing plate; 62. Sealing strip; 7. Translation unit; 70. Sliding groove; 71. Sliding plate; 72. Drive plate; 73. Drive screw; 8. Limiting assembly; 80. Structural groove; 81. Drive gear; 82. Drive rack; 83. Limiting groove; 84. Driven protrusion; 85. Spring plate; 86. Active protrusion. Detailed Implementation

[0040] The following combination Figures 1 to 18 The embodiments of the present invention will be described in detail below.

[0041] This application discloses a flat plate heat pipe for heat dissipation of battery stacks. Specifically, this application is mainly used in the process of heat dissipation of battery stacks. Technically, through a unique heat dissipation plate design, it ensures heat transfer from the battery stack while also meeting the requirements of small space usage, providing a possibility for heat dissipation in small-space battery stacks. The inclined arrangement of microchannels inside the flat plate heat pipe provides power for vapor transport and liquid reflux. The microgroove structure and capillary wick within each microchannel provide capillary force, enhancing the disturbance of the internal working fluid, strengthening heat exchange, improving heat exchange efficiency, and ensuring the efficient and safe use of the battery. Furthermore, based on the above, this invention also designs a rapid installation and disassembly device for the battery stack. By driving multiple flat plate heat pipes to move synchronously, it provides clearance and space for the installation and disassembly of the battery stack, further improving the applicability of this application.

[0042] Example 1: Refer to Figure 1 , Figure 2 and Figure 3 As shown, the device includes a protective box 1, a limiting frame 10, a battery stack 11, and a heat-conducting unit 2. The limiting frames 10 are symmetrically distributed on the bottom wall of the protective box 1, and several battery stacks 11 are placed on the bottom wall of the protective box 1. The battery stacks 11 are separated by two limiting frames 10 and are evenly distributed along the corresponding limiting frames 10. A heat-conducting unit 2 for absorbing the heat of the battery stacks 11 is also provided between the two limiting frames 10.

[0043] The limiting frame 10 is used to limit the bottom of the battery stack 11, so that the battery stack 11 can be evenly installed inside the protective box 1 and in contact with the heat conduction unit 2 to dissipate heat evenly.

[0044] Reference Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, a heat-conducting unit 2 for absorbing heat from the battery stack 11 is also provided between the rectangular frames. Specifically, the heat-conducting unit 2 includes a rectangular plate 20, a rectangular groove 21, a thermally conductive silicon pad 22, a flat hot plate 23, a partition 24, a microchannel 25, a micro fin 26, and a micro groove 27. The rectangular plate 20 is located on one side of the battery stack 11, and a rectangular groove 21 is opened on the side of the rectangular plate 20 facing the battery stack 11. A thermally conductive silicon pad 22 that contacts the outside of the battery stack 11 is provided in the rectangular groove 21. The thermally conductive silicon pad 22 is used to increase the thermal conductivity area between the battery stack 11 and the rectangular plate 20. When the battery stack 11 dissipates heat, the heat is transferred from the thermally conductive silicon pad 22 to the rectangular plate 20.

[0045] A flat hot plate 23 is provided on the side of the rectangular plate 20 away from the battery stack 11. The heat received by the rectangular plate 20 will be transferred to the flat hot plate 23. The interior of the flat hot plate 23 is hollow. Several baffles 24 with inclined angles are provided inside the flat hot plate 23. The baffles 24 divide the hollow area of ​​the flat hot plate 23 into several microchannels 25. Several microfins 26 are provided in the several microchannels 25, and the several microfins 26 extend along the inclined direction of the corresponding baffles 24. The spacing between the several microfins 26 forms microgrooves 27.

[0046] The cavity inside the flat plate hot plate 23 is filled with coolant. After receiving heat, the coolant will flow inside the flat plate hot plate 23 to move the heat. The area of ​​the flat plate hot plate 23 in contact with the rectangular plate 20 is the evaporation section, and the area of ​​the flat plate hot plate 23 not in contact with the rectangular plate 20 is the condensation section. The evaporation section is used to absorb the heat transferred by the rectangular plate 20, while the condensation section is used to transfer the heat out of the flat plate hot plate 23.

[0047] According to the existing flat plate heat plate 23 array structure, the internal channels are all horizontal. Therefore, when used for heat dissipation of the battery stack 11, it cannot provide power for the transport of steam and the return of liquid, and cannot play a role in heat transfer. The microchannel 25 in this embodiment has a certain tilt angle, which can ensure that the steam generated by the vaporization of the coolant in the evaporation section is smoothly transported to the condensation section for condensation. At the same time, it can also ensure that the cooled coolant can return to the evaporation section under the action of gravity and capillary force, ensuring the stable operation of the flat plate heat plate 23. At the same time, it can also fit well with the battery stack 11 through the rectangular plate 20, so as to achieve the purpose of heat dissipation of the battery stack 11.

[0048] The baffle 24 separates each microchannel 25 to form an array structure, ensuring that if one microchannel 25 is damaged, the other microchannels 25 can continue to operate without being affected. Each channel has a micro-fin 26 forming a microgroove 27 structure, the design of which generates capillary force. This also helps the coolant to be distributed more evenly inside the heat pipe, avoiding localized overheating or overcooling.

[0049] Continue to refer to Figure 7 , Figure 8 and Figure 9 As shown, a wire mesh liquid-absorbing core 3 or powder sintering 30 is also provided on the inner wall of the micro-groove 27. The wire mesh liquid-absorbing core 3 can increase the range of capillary force and make up for the problem of insufficient capillary force in some areas of the micro-groove 27 structure. At the same time, the relatively soft characteristics of the wire mesh liquid-absorbing core 3, combined with the structure of the micro-groove 27, can better fit the working environment.

[0050] The powder sintered liquid absorber structure 30 has a uniform pore distribution and high strength. When combined with the microgroove structure 27, it can enhance the structural stability of the liquid absorber, reduce deformation and damage caused by external forces or long-term use, and significantly improve the circulation efficiency of coolant in the flat hot plate 23.

[0051] Continue to refer to Figure 4 and Figure 10 and Figure 11 As shown, a cooling unit 4 for cooling the flat plate 23 is also provided on one side; specifically, the cooling unit 4 includes a cooling plate 40, a flow channel 41, a water inlet 42 and a water outlet 43. The cooling plate 40 is installed on one side of the flat plate 23 and is L-shaped to accommodate the battery stack 11. The flow channel 41 is opened in the cooling plate 40 and the cooling plate 40 is in contact with the condensation section on the flat plate 23.

[0052] The flow channel 41 is distributed in a U-shape, and the two ends of the flow channel 41 extend to the outer wall of the cooling plate 40 to form an inlet 42 and an outlet 43, respectively. Cooling water enters the flow channel 41 through the inlet 42 and flows out of the flow channel 41 through the outlet 43. By inputting cooling water into the inlet 42, the cooling water can flow in the flow channel 41, and the cooling water can carry away the heat transferred from the condensation section of the flat plate hot plate 23 through the cooling plate 40. Then the cooling water carries the heat and is discharged from the outlet 43 to the outside of the flow channel 41.

[0053] Thermal grease is applied between the cooling plate 40 and the rectangular plate 20 to increase the heat conduction area between the cooling plate 40 and the flat hot plate 23.

[0054] The advantage of setting the internal flow channel 41 of the cooling plate 40 as a loop flow channel 41 is that the internal channels of common water-cooled plates are serpentine channels or parallel channels, which will result in the working fluid temperature being low in the channel close to the water inlet, while the water coolant far from the channel inlet will become hotter due to heat exchange with the water-cooled plate, resulting in poor temperature uniformity of the water-cooled plate.

[0055] Therefore, in order to solve the problem of temperature uniformity, a "return" shaped flow channel 41 with good temperature uniformity was designed. This design arranges the hot and cold fluid flow channels 41 in an alternating manner, so that the temperature of each part of the cooling plate 40 is similar, and there will be no local high temperature. The temperature uniformity is better. At the same time, due to its regular layout, it is also more convenient in the processing.

[0056] Reference Figure 12 and Figure 13As shown, a side box 50 is provided through one side of the protective box 1. A circulation unit 5 for supplying cooling water to the cooling plate 40 is provided inside the side box 50. Specifically, the circulation unit 5 includes the side box 50, a limiting plate 51, a sliding plate 52, a water inlet pipe 53, a water outlet pipe 54, a water pump 55, and a connecting pipe 56. Two limiting plates 51 are symmetrically arranged on the inner walls of the two sides of the side box 50. Several sliding plates 52 corresponding to the cooling plate 40 are slidably arranged between the limiting plates 51. A water inlet pipe 53 and a water outlet pipe 54 are provided between the sliding plates 52 and the water inlet 42 and the water outlet 43 on the corresponding cooling plate 40.

[0057] A water pump 55 is also installed on the inner wall of the side box 50. Two connecting pipes 56 are symmetrically arranged on one side of the sliding plate 52 and are connected to the corresponding water inlet pipe 53 and water outlet pipe 54. The other side of the connecting pipe 56 is connected to the water pump 55, and the connecting pipe 56 is made of a retractable material.

[0058] As can be seen from the above, the water pump 55 pumps the cooling water from the corresponding connecting pipe 56 into the inlet pipe 53. The cooling water in the inlet pipe 53 then enters the flow channel 41 from the inlet 42. After flowing through the flow channel 41, the cooling water flows through the outlet 43 into the outlet pipe 54. The coolant in the outlet pipe 54 then enters the water pump 55 through the lower connecting pipe 56. After being cooled, it is pumped back into the upper connecting pipe 56 by the water pump 55, thus circulating and achieving the purpose of cooling the flat plate heat plate 23 by the cooling plate 40.

[0059] Example 2: Refer to Figure 14 As shown, based on Embodiment 1, in order to seal the upper ends of the protective box 1 and the side box 50, a sealing component 6 is provided at the upper ends of both the protective box 1 and the side box 50. Specifically, the sealing component 6 includes an insertion slot 60, a sealing plate 61, and a sealing strip 62. The insertion slot 60 is opened at the upper ends of the protective box 1 and the side box 50, and the sealing plate 61 is located at the upper ends of the protective box 1 and the side box 50. A sealing strip 62 located in the corresponding insertion slot 60 is provided on the lower side of the sealing plate 61.

[0060] The sealing plate 61 seals the upper end of the protective box 1 to prevent foreign objects from entering the protective box 1 and the side box 50. The sealing strip 62 improves the sealing between the sealing plate 61 and the protective box 1 by being inserted into the insertion groove 60.

[0061] Example 3: Refer to Figure 15 and Figure 16As shown, based on Embodiment 1 and Embodiment 2, in order to move the flat hot plate 23 so that the battery stack 11 can be taken out from and installed in the protective box 1, the rectangular plate 20 and the battery stack 11 are slidably connected, and a translation unit 7 is provided in the protective box 1. Specifically, the translation unit 7 includes a rectangular cavity, a sliding groove 70, a sliding plate 71, a drive plate 72 and a drive screw 73. The rectangular cavity is opened inside the protective box 1, and the sliding groove 70 is opened between the limiting frames 10. The sliding groove 70 is connected to the inner top wall of the rectangular cavity. Several sliding plates 71 corresponding one-to-one with the flat hot plate 23 are slidably arranged in the sliding groove 70, and one side of the sliding plate 71 is connected to the lower side of the flat hot plate 23.

[0062] The lower side of the sliding plate 71 extends into the rectangular cavity and is provided with a drive plate 72 that is slidably connected to the rectangular cavity. That is, when the drive plate 72 is driven by an external force, it can drive the corresponding sliding plate 71 to move in the sliding groove 70. The sliding plate 71 can then drive the corresponding flat hot plate 23 to move in the protective box 1. A drive screw 73 is rotatably provided on one side of the protective box 1, and one side of the drive screw 73 slides through into the rectangular cavity and is slidably connected to several drive plates 72 until it extends to the other side of the protective box 1. The drive screw 73 is threadedly connected to the drive plates 72 on the front and rear sides of the protective box 1. When the drive screw 73 rotates, the drive plates 72 on both sides will move in relative or opposite directions.

[0063] As can be seen from the above, by driving one side of the drive screw 73 with external force, the drive screw 73 can rotate, which can drive the drive plates 72 on both sides to move, so that the drive plates 72 drive the flat hot plates 23 on both sides to move synchronously. The other drive plates 72 are slidably connected to the drive screw 73, so the other corresponding flat hot plates 23 will not move. In the process of installing the battery stack 11, the flat hot plates 23 on both sides are first moved to the sides of the protective box 1 by the drive screw 73, and the battery stack 11 is placed on the inner wall of the protective box 1 in sequence and limited by the corresponding limit frame 10. Then, the flat hot plate 23 in the middle is manually pushed to move, so that the rectangular plate 20 on one side of the flat hot plate 23 can drive the thermal conductive silicon pad 22 to stick tightly to the side of the battery stack 11.

[0064] Then, the drive shaft is driven to rotate again, causing the drive screw 73 to indirectly drive the flat hot plates 23 on both sides to move towards the battery stack 11. The rectangular plates 20 on both sides clamp the corresponding row of battery stacks 11 to prevent the battery stacks 11 from shaking in the protective box 1. When the flat hot plates 23 drive the cooling plates 40 to move, the cooling plates 40 will drive the sliding plates 52 to slide between the limiting plates 51 through the water inlet pipe 53 and the water outlet pipe 54. Since the connecting pipes 56 are telescopic, the sliding plates 52 will drive the corresponding two connecting pipes 56 to stretch without affecting the supply and return of cooling water. The sliding plates 52 guide the movement within the limiting plates 51 to prevent multiple connecting pipes 56 from contacting each other and getting tangled or twisted.

[0065] Example 4: Refer to Figure 17 and Figure 18 As shown, based on Embodiments 1, 2, and 3, in order to limit the sealing plate 61 and prevent it from detaching from the upper end of the protective box 1 and the side box 50, a limiting component 8 for the sealing plate 61 is provided on both sides of the protective box 1. Specifically, the limiting component 8 includes a structural groove 80, a drive gear 81, a drive rack 82, a limiting groove 83, a driven protrusion 84, a spring plate 85, and an active protrusion 86. The structural groove 80 is opened on both sides of the protective box 1, and the two sides of the drive screw 73 are located in the corresponding structural groove 80. The drive gear 81 located in the corresponding structural groove 80 is sleeved on both sides of the drive screw 73, and the drive rack 82 is also slidably arranged in the structural groove 80. That is, when the drive screw 73 rotates, it can drive the drive gear 81 on its outer side to rotate, and the rotation of the drive gear 81 can drive the corresponding drive rack 82 to move up and down in the structural groove 80.

[0066] The protective box 1 has symmetrically arranged limiting grooves 83 on both sides, which are connected to the corresponding structural grooves 80. Several driven protrusions 84 are arranged on the inner wall of the limiting grooves 83 along their extension sections. The upper side of the drive rack 82 is provided with a spring plate 85 made of elastic material, which is located in the corresponding limiting groove 83. The side of the spring plate 85 near the limiting groove 83 is provided with an active protrusion 86, and the active protrusion 86 is in contact with any of the driven protrusions 84. That is, when the drive rack 82 moves upward, it will drive the spring plate 85 to be inserted into the limiting groove 83. Then the active protrusion 86 on the spring plate 85 will contact the lowest driven protrusion 84. At this time, the drive rack 82 continues to move, and the spring plate 85 will undergo elastic deformation, causing the active protrusion 86 to engage with the upper side of the corresponding driven protrusion 84, thereby indirectly limiting the sealing plate 61.

[0067] When the drive screw 73 indirectly drives the drive plates 72 on both sides to move towards both sides of the protection box 1, that is, when the battery stack 11 is no longer limited and needs to be replaced, the drive screw 73 can indirectly drive the drive rack 82 to descend. The drive rack 82, in turn, indirectly drives the active protrusion 86 to no longer limit the sealing plate 61, allowing the operator to remove the sealing plate 61 from the protection box 1 and the side box 50. After the battery stack 11 is replaced, the sealing plate 61 is placed on the protection box 1 and the side plate, and then the drive screw 73 is driven to rotate in the opposite direction, indirectly driving the two... The rectangular plate 20 on the side clamps the battery stack 11. At the same time, the drive screw 73 drives the drive rack 82 to move upward through the drive gear 81, so that the drive rack 82 can indirectly drive the active protrusion 86 to engage with the corresponding driven protrusion 84. The battery stack 11 of different widths will affect the movement stroke of the rectangular plates 20 on both sides, that is, the number of rotations of the drive screw 73 is not consistent. Therefore, by setting multiple driven protrusions 84, as long as the drive rack 82 drives the active protrusion 86 to engage with any one of the driven protrusions 84, the sealing plate 61 can be limited.

[0068] During operation: First, the operator removes the sealing plate 61 from the top of the protection box 1 and the side box 50, so that the battery stack 11 can enter the protection box 1 and adjust the water pump 55.

[0069] Step 2: Place the battery stack 11 on the inner wall of the protective box 1 in sequence, and limit the battery stack 11 by the limiting frame 10.

[0070] Step 3: After the battery stack 11 is installed, cover the top of the protective box 1 and the side box 50 with the sealing plate 61.

[0071] Step 4: The operator drives the drive screw 73 to rotate, so that the rectangular plates 20 on both sides move toward the battery stack 11. At the same time, the several rectangular plates 20 in the middle can follow the battery stack 11 to move adaptively until the rectangular plates 20 on both sides contact and abut against the sides of the battery stack 11.

[0072] Step 5: During the process of driving the lead screw to rotate, the limiting component 8 simultaneously limits the sealing plate 61 on the protective box 1 and the side box 50 to prevent it from falling off.

[0073] Step 6: The heat conduction unit 2 can absorb the heat generated by the battery stack 11, and the cooling unit 4 can cool down the heat conduction unit 2, so that the heat conduction unit 2 can continuously absorb the heat generated by the battery stack 11, while the circulation unit 5 can continuously circulate the cooling water in the cooling unit 4, so that the cooling water can always be kept at a suitable temperature.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0075] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flat plate heat pipe for heat dissipation of a battery stack, comprising a protection box (1), characterized in that: The bottom wall of the protection box (1) is provided with symmetrically distributed limiting frames (10), and a plurality of battery stacks (11) are placed on the bottom wall of the protection box (1), and the plurality of battery stacks (11) are separated by two limiting frames (10) and are uniformly distributed along the corresponding limiting frames (10), and a heat conduction unit (2) for absorbing heat of the battery stacks (11) is further arranged between the two limiting frames (10). The heat conduction unit (2) comprises a rectangular plate (20) arranged on one side of the battery stack (11), a rectangular groove (21) is formed on the side of the rectangular plate (20) facing the battery stack (11), and a heat conduction silicon pad (22) in contact with the outer side of the battery stack (11) is arranged in the rectangular groove (21). The side of the rectangular plate (20) away from the battery stack (11) is provided with a flat heat plate (23), the inside of the flat heat plate (23) is hollow, a plurality of inclined partition plates (24) are arranged in the inside of the flat heat plate (23), and the hollow area of the flat heat plate (23) is divided into a plurality of micro-channels (25) by the partition plates (24). A plurality of micro-fins (26) are arranged in the plurality of micro-channels (25), and the plurality of micro-fins (26) extend along the inclined direction of the corresponding partition plates (24), and the spacing between the plurality of micro-fins (26) forms a micro-groove (27). The side of the flat heat plate (23) is further provided with a cooling unit (4) for cooling and cooling, the cooling unit (4) comprises a cooling plate (40) mounted on one side of the flat heat plate (23), the cooling plate (40) is L-shaped for accommodating the battery stack (11), and a flow channel (41) is formed in the cooling plate (40). The flow channel (41) is in a meandering distribution, and the two ends of the flow channel (41) respectively penetrate the outer wall of the cooling plate (40) to form a water inlet (42) and a water outlet (43), and the cooling water enters the flow channel (41) from the water inlet (42) and then flows out of the flow channel (41) from the water outlet (43).

2. The flat plate heat pipe for heat dissipation of a battery stack according to claim 1, characterized by: The inner wall of the micro-groove (27) is further provided with a silk screen liquid absorbing core (3) or a powder sintering (30).

3. The flat plate heat pipe for heat dissipation of a battery stack according to claim 1, characterized in that: The cooling plate (40) and the rectangular plate (20) are smeared with heat-conducting silicone grease.

4. The flat plate heat pipe for heat dissipation of a battery stack according to claim 1, characterized by: A side box (50) is provided on one side of the protection box (1), a circulating unit (5) for supplying cooling water to the cooling plate (40) is arranged in the side box (50), the circulating unit (5) comprises limiting plates (51) symmetrically arranged on the inner walls of the two sides of the side box (50), a plurality of sliding plates (52) corresponding to the cooling plate (40) are slidably arranged between the limiting plates (51), and water inlet pipes (53) and water outlet pipes (54) are arranged between the sliding plates (52) and the water inlets (42) and the water outlets (43) on the corresponding cooling plate (40).

5. The flat plate heat pipe for heat dissipation of a battery stack according to claim 4, characterized by: A water pump (55) is further arranged on the inner wall of the side box (50), two connecting pipes (56) penetratingly connected with the corresponding water inlet pipes (53) and water outlet pipes (54) are symmetrically arranged on one side of the sliding plate (52), and the other side of the connecting pipe (56) is connected with the water pump (55).

6. The flat plate heat pipe for heat dissipation of a battery stack according to claim 5, wherein: The connecting pipe (56) is made of stretchable material.

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