Flat heat pipe for heat dissipation of battery stack

Abstract

The invention relates to the field of heat dissipation of battery stacks, in particular to a flat heat pipe for heat dissipation of battery stacks, which comprises a protection box, limiting frames which are symmetrically distributed are arranged on the inner bottom wall of the protection box, a plurality of battery stacks are further placed on the inner bottom wall of the protection box, and the plurality of battery stacks are separated by two limiting frames and are uniformly distributed along the corresponding limiting frames. A heat conduction unit used for absorbing heat of the cell stack is further arranged between the two limiting frames, heat transfer of the cell stack can be guaranteed through the uniquely-designed flat plate heat pipe, use of the cell stack in a small space can be met, and possibility is provided for cell heat dissipation of the cell stack in the small space. The inclined arrangement of the micro-channels in the flat heat pipe provides power for transmission of steam and backflow of liquid, the micro-groove structure and the capillary core in each micro-channel can provide capillary force, disturbance of internal working media is enhanced, heat exchange is enhanced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of heat dissipation of battery stacks, and in particular to a flat heat pipe used for heat dissipation of battery stacks. Background Art

[0002] With the continuous development of science and technology, battery stacks are increasingly used in various fields, such as electric vehicles and energy storage systems. In order to improve the energy density of battery stacks, the volume of battery cells is getting smaller and smaller, and the power is getting larger and larger, which makes the heat generated per unit volume increase sharply. If the heat cannot be dissipated in a timely and effective manner, it will affect the performance, life and even safety of the battery. There are two main traditional heat dissipation and temperature control methods: one is cold plate indirect cooling, which mainly uses the cold plate radiator at the bottom to use the circulating coolant to take away the heat generated by the battery cell for cooling, but the heating part of the battery cell is mainly in the upper part, resulting in a large temperature difference between the upper and lower parts, which is only suitable for low-rate application scenarios; second, in order to adapt to the application scenario requirements of higher charging rates, many manufacturers and research institutions currently have high hopes for immersion cooling, that is, immersing the battery cell in coolant to cool it down. This puts forward many high standards for insulation, safety and compatibility of the immersion coolant, and has the disadvantages of high cost and high safety risks; in summary, the existing heat dissipation methods are difficult to meet the diverse heat dissipation needs, and more efficient heat dissipation technology is needed.

[0003] As an efficient heat dissipation technology, flat heat pipes have the advantages of efficient heat dissipation performance, good temperature uniformity, compact structure, and high reliability, and are widely used in the heat dissipation of battery stacks. The heat generated by the battery stack can be quickly conducted away to achieve uniform heat dissipation. Its flat structural characteristics also allow it to better adapt to the shape of the battery stack, making it easy to install and integrate. At the same time, flat heat pipes also have the advantages of light weight, high reliability, and no moving parts, which can meet the special requirements of battery stack heat dissipation; Publication No. CN115189070A discloses a flat heat pipe for power batteries, which is designed to guide the flow of coolant in the storage tank to vaporize the coolant, but the flat heat pipe occupies a large area, and it is difficult to achieve the purpose of heat dissipation for battery stacks that require space. And because the side of the battery stack is not flat, the flat plate cannot completely fit 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 the existing flat plate heat pipes. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a flat heat pipe for dissipating heat of a battery stack, including a protective box, a symmetrically distributed limit frame is arranged on the bottom wall of the protective box, a plurality of battery stacks are placed on the bottom wall of the protective box, and the plurality of battery stacks are separated by two limit frames and evenly distributed along the corresponding limit frames, and a heat conduction unit for absorbing heat from the battery stack is also arranged between the two limit frames.

[0006] The heat conduction unit comprises a rectangular plate arranged at one side of the battery stack, a rectangular groove is opened on the side of the rectangular plate facing the battery stack, and a heat conduction silicon pad in contact with the outer side of the battery stack is arranged in the rectangular groove.

[0007] Preferably, a flat heat plate is arranged on the side of the rectangular plate away from the battery stack, the interior of the flat heat plate is cavity-shaped, and a plurality of partitions with inclined angles are arranged inside the flat heat plate, and the partitions separate the cavity area of ​​the flat heat plate into a plurality of microchannels.

[0008] Preferably, a plurality of micro-wings are disposed in the plurality of micro-channels, and the plurality of micro-wings extend along the inclined direction of the corresponding partition plate, and the intervals between the plurality of micro-wings form micro-grooves.

[0009] Preferably, a wire mesh liquid wick or powder sintering is also provided on the inner wall of the micro groove.

[0010] Preferably, a cooling unit for cooling the flat hot plate is also provided on one side of the flat hot plate, and the cooling unit comprises a cooling plate installed on one side of the flat hot plate, and the cooling plate is L-shaped for accommodating the battery stack, and a flow channel is opened in the cooling plate.

[0011] Preferably, the flow channel is distributed in a zigzag shape, and both ends of the flow channel respectively penetrate the outer wall of the cooling plate to form a water inlet and a water outlet, and the cooling water enters the flow channel from the water inlet and then flows out of the flow channel from the water outlet.

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

[0013] Preferably, a side box is provided through one side of the protection box, and a circulation unit for supplying cooling water to the cooling plate is provided in the side box. The circulation unit includes limit plates symmetrically arranged on the inner walls on both sides of the side box, and several sliding plates corresponding to the cooling plates are slidably arranged between the limit plates. A water inlet pipe and a water outlet pipe are provided between the sliding plates and the water inlet and the water 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 connected to the corresponding water inlet pipe and water outlet pipe are symmetrically provided on one side of the sliding plate, and the other side of the connecting pipe is connected to the water pump.

[0015] Preferably, the connecting tube is made of a retractable material.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present invention can ensure the heat transfer of the battery stack through the uniquely designed flat heat pipe, and can meet the use of the small space of the battery stack, providing a possibility for the heat dissipation of the batteries in the small space battery stack; the inclined arrangement of the microchannels inside the flat heat pipe provides power for the transmission of steam and the reflux of liquid, and the microgroove structure and capillary core in each microchannel can provide capillary force, enhance the disturbance of the internal working fluid, strengthen the heat exchange, and improve the heat exchange efficiency.

[0017] 2. The meandering flow channel of the cooling plate in the present invention staggers the cold and hot fluid flow channels so that the temperatures of various parts of the cooling plate are similar, and there will be no consequences of locally high temperatures. The temperature uniformity is better, and due to its regular layout, it is also more convenient in the processing process. Furthermore, by providing a side box on one side of the protective box and providing a circulation unit in the side box, continuous circulation of cooling water is achieved, ensuring that the cooling water is always maintained at an appropriate temperature, ensuring that the heat transfer unit in the present invention can continuously absorb the heat generated by the battery stack, and ensuring that the battery stack can operate within a reasonable temperature range.

[0018] 3. The present invention realizes the replacement of the battery stack and ensures the safety of the equipment by setting a movable translation unit and a limit assembly. The translation unit can drive the flat hot plate to move to avoid the installation and disassembly area for the battery stack, thereby facilitating the installation and replacement of the battery stack, while the limit assembly limits the sealing plate to prevent it from falling off, thereby further improving the safety of the battery stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the main body structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the protection box of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the limit frame of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the heat conduction unit and the cooling unit of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the rectangular groove and the thermal conductive silicon pad of the present invention.

[0025] Figure 6 It is a cross-sectional view of a flat hot plate of the present invention.

[0026] Figure 7 It is a planar cross-sectional view of a flat hot plate of the present invention.

[0027] Figure 8 It is a schematic diagram of the silk screen liquid absorbent core of the present invention.

[0028] Fig. 9 Schematic diagram of the sintering of the powder of the present invention.

[0029] Fig.10 It is a structural schematic diagram of the cooling unit of the present invention.

[0030] Fig.11 It is a plan cross-sectional view of the cooling unit of the present invention.

[0031] Fig.12 It is a schematic structural diagram of the circulation unit of the present invention.

[0032] Fig.13 The present invention Fig.12 A partial enlarged view of the structure at point A.

[0033] Fig.14 It is a schematic structural diagram of the plugging assembly of the present invention.

[0034] Fig.15 It is a structural schematic diagram of the translation unit of the present invention.

[0035] Fig.16 It is a planar cross-sectional view of the translation unit of the present invention.

[0036] Fig.17 It is a structural schematic diagram of the limiting component of the present invention.

[0037] Fig.18 The present invention Fig.17 A magnified view of part of the structure at point B.

[0038] In the figure, 1, protection box; 10, limit frame; 11, battery stack; 2, heat conduction unit; 20, rectangular plate; 21, rectangular groove; 22, heat conduction silicon pad; 23, flat heat plate; 24, partition; 25, microchannel; 26, micro-wing; 27, micro-groove; 3, wire mesh wick; 30, powder sintering; 4, cooling unit; 40, cooling plate; 41, flow channel; 42, water inlet; 43, water outlet; 5, circulation unit; 50, side box; 51, limit plate; 5 2. Sliding plate; 53. Water inlet pipe; 54. Water outlet pipe; 55. Water pump; 56. Connecting pipe; 6. Sealing assembly; 60. Insertion groove; 61. Sealing plate; 62. Sealing strip; 7. Translation unit; 70. Sliding groove; 71. Sliding plate; 72. Driving plate; 73. Driving screw rod; 8. Limiting assembly; 80. Structural groove; 81. Driving gear; 82. Driving rack; 83. Limiting groove; 84. Driven protrusion; 85. Spring plate; 86. Active protrusion. DETAILED DESCRIPTION

[0039] The following combination Figures 1 to 18 Embodiments of the present invention are described in detail.

[0040] The embodiment of the present application discloses a flat plate heat pipe for heat dissipation of a battery stack, and it is explained that the present application is mainly used in the process of heat dissipation of a battery stack. In terms of technical effect, it can ensure the heat transfer of the battery stack through a unique heat dissipation flat plate design, and can meet the use of a small space of the battery stack, thereby providing a possibility for heat dissipation of batteries in a small space battery stack; the inclined arrangement of microchannels inside the flat plate heat pipe provides power for the transmission of steam and the reflux of liquid, and the microgroove structure and capillary wick in each microchannel can provide capillary force, thereby enhancing the disturbance of the internal working fluid, strengthening heat exchange, improving heat exchange efficiency, and ensuring efficient and safe use of the battery; and on the basis of the above, the present invention also designs a rapid installation and disassembly device for the battery stack, which drives multiple flat plate heat pipes to move synchronously, thereby providing avoidance and space for the installation and disassembly of the battery stack, thereby further improving the applicability of the present application.

[0041] Example 1: Reference Figure 1 , Figure 2 and Figure 3 As shown, it includes a protection box 1, a limiting frame 10, a battery stack 11 and a heat conduction unit 2. The inner bottom wall of the protection box 1 is provided with symmetrically distributed limiting frames 10, and a plurality of battery stacks 11 are also placed on the inner bottom wall of the protection box 1. The plurality of battery stacks 11 are separated by two limiting frames 10 and are evenly distributed along the corresponding limiting frames 10. A heat conduction unit 2 for absorbing heat from the battery stack 11 is also provided between the two limiting frames 10.

[0042] 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 protection box 1 and contact with the heat conduction unit 2 to evenly dissipate heat.

[0043] 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 heat plate 23, a partition 24, a microchannel 25, a micro-fin 26 and a micro-groove 27. The rectangular plate 20 is provided on one side of the battery stack 11. A rectangular groove 21 is provided on the side of the rectangular plate 20 facing the battery stack 11. A thermally conductive silicon pad 22 in contact with the outer side of the battery stack 11 is provided in the rectangular groove 21. The thermally conductive silicon pad 22 is used to increase the heat conduction area between the battery stack 11 and the rectangular plate 20. When the battery stack 11 emits heat, the heat is transferred from the thermally conductive silicon pad 22 to the rectangular plate 20.

[0044] A flat heat plate 23 is arranged on the side of the rectangular plate 20 facing away from the battery stack 11, and the heat received by the rectangular plate 20 will be transferred to the flat heat plate 23; the interior of the flat heat plate 23 is cavity-shaped, and a plurality of partitions 24 with oblique angles are arranged inside the flat heat plate 23, and the partitions 24 divide the cavity area of ​​the flat heat plate 23 into a plurality of microchannels 25, and a plurality of microwings 26 are arranged in the plurality of microchannels 25, and the plurality of microwings 26 extend along the inclined direction of the corresponding partitions 24, and the spacing between the plurality of microwings 26 forms a microgroove 27.

[0045] The cavity in the flat hot plate 23 is filled with cooling liquid. After receiving heat, the cooling liquid will flow inside the flat hot plate 23 to drive the heat to move. The area where the flat hot plate 23 contacts the rectangular plate 20 is the evaporation section, and the area where the flat hot plate 23 does not contact the rectangular plate 20 is the condensation section. The evaporation section is used to absorb the heat transferred by the rectangular plate 20, and the condensation section is used to transfer the heat out of the flat hot plate 23.

[0046] According to the existing array structure of the flat heat plate 23, the internal channels are all horizontal, so when used to dissipate heat for the battery stack 11, it cannot provide power for the transportation of steam and the reflux of liquid, and cannot play a role in heat transfer; the microchannel 25 in the present implementation process has a certain inclination angle, which can ensure that the steam generated by the vaporization of the coolant in the evaporation section is smoothly transmitted to the condensation section for condensation, and also ensure that the cooled coolant can flow back to the evaporation section under the action of gravity and capillary force, thereby ensuring the stable operation of the flat heat plate 23, and at the same time can be well fitted with the battery stack 11 through the rectangular plate 20, so as to achieve the purpose of heat dissipation for the battery stack 11.

[0047] The partition 24 is used to separate each microchannel 25 to form an array structure, ensuring that when one microchannel 25 is damaged, other microchannels 25 can continue to work without being affected; micro-fins 26 are used to form a micro-groove 27 structure in each channel, and the design of the micro-groove 27 structure can generate capillary force. At the same time, it also helps to distribute the coolant more evenly inside the heat pipe to avoid local overheating or overcooling.

[0048] Continue to refer to Figure 7 , Figure 8 and Fig. 9 As shown, a wire mesh wick 3 or a powder sinter 30 is also provided on the inner wall of the micro groove 27. The wire mesh wick 3 can increase the range of action of the capillary force and make up for the problem of insufficient capillary force in certain areas of the micro groove 27 structure. At the same time, the relatively soft property of the wire mesh wick 3 combined with the micro groove 27 structure can better fit the working environment.

[0049] The powder sintered 30 liquid wick structure has uniform pore distribution and high strength. When combined with the microgroove 27 structure, it can enhance the structural stability of the liquid wick, reduce deformation and damage caused by external force or long-term use, and significantly improve the circulation efficiency of the coolant in the flat hot plate 23.

[0050] Continue to refer to Figure 4 and Fig.10 and Fig.11 As shown, a cooling unit 4 for cooling the flat hot plate 23 is also provided on one side thereof; 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 hot plate 23, and the cooling plate 40 is L-shaped for accommodating the battery stack 11. A flow channel 41 is provided in the cooling plate 40, and the cooling plate 40 is in contact with the condensation section on the flat hot plate 23.

[0051] The flow channel 41 is distributed in a zigzag shape, 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. 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. By inputting cooling water into the water 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 hot plate 23 through the cooling plate 40, and then the cooling water carries the heat and is discharged from the water outlet 43 to the outside of the flow channel 41.

[0052] Thermal grease is applied between the cooling plate 40 and the rectangular plate 20 , and the thermal grease is used to increase the heat conduction area between the cooling plate 40 and the flat heat plate 23 .

[0053] The advantages of setting the internal flow channel 41 of the cooling plate 40 as a return flow channel 41 are as follows: the common internal channels of water-cooled plates are serpentine channels or parallel channels, which will cause the temperature of the channel working medium close to the water inlet to be low, and the temperature of the water-cooling liquid far away from the channel inlet becomes high due to heat exchange with the water-cooled plate, resulting in poor temperature uniformity of the water-cooled plate.

[0054] Therefore, in order to solve the temperature uniformity problem, a "return" type flow channel 41 with good temperature uniformity is designed. This design arranges the cold and hot fluid flow channels 41 in a staggered manner so that the temperatures of various parts of the cooling plate 40 are similar, and there will be no consequences of local high temperatures. The temperature uniformity is better, and due to its regular layout, it is also more convenient during the processing process.

[0055] Reference Fig.12 and Fig.13As shown, a side box 50 is provided through one side of the protection box 1, and a circulation unit 5 for supplying cooling water to the cooling plate 40 is provided in the side box 50; specifically, the circulation unit 5 includes a side box 50, a limit 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 limit plates 51 are symmetrically arranged on the inner walls on both sides of the side box 50, and a plurality of sliding plates 52 corresponding to the cooling plates 40 are slidably arranged between the limit plates 51, and a water inlet pipe 53 and a water outlet pipe 54 are provided between the sliding plate 52 and the water inlet 42 and the water outlet 43 on the corresponding cooling plate 40.

[0056] A water pump 55 is also provided on the inner wall of the side box 50, and two connecting pipes 56 connected to the corresponding water inlet pipe 53 and water outlet pipe 54 are symmetrically provided on one side of the sliding plate 52, and the other side of the connecting pipe 56 is connected to the water pump 55, and the connecting pipe 56 is made of retractable material.

[0057] As can be seen from the above, the water pump 55 pumps the cooling water from the corresponding connecting pipe 56 into the water inlet pipe 53, and the cooling water in the water inlet pipe 53 will enter the flow channel 41 from the water inlet 42. The cooling water flows through the flow channel 41 and then flows to the water outlet pipe 54 through the water outlet 43. The water-cooled liquid in the water outlet pipe 54 then enters the water pump 55 through the lower connecting pipe 56, and after cooling, it is pumped into the upper connecting pipe 56 by the water pump 55 again, so as to circulate, thereby achieving the cooling purpose of the cooling plate 40 on the flat hot plate 23.

[0058] Example 2: Reference Fig.14 As shown, on the basis of the first embodiment, in order to be able to seal the upper ends of the protection box 1 and the side box 50, a sealing component 6 is provided at the upper ends of the protection box 1 and the side box 50; specifically, the sealing component 6 includes an insertion groove 60, a sealing plate 61 and a sealing strip 62, the insertion groove 60 is opened at the upper ends of the protection box 1 and the side box 50, and the sealing plate 61 is located at the upper ends of the protection box 1 and the side box 50, and a sealing strip 62 located in the corresponding insertion groove 60 is provided on the lower side of the sealing plate 61.

[0059] The blocking plate 61 blocks the upper end of the protection box 1 to prevent foreign objects from entering the protection box 1 and the side box 50 . The blocking strip 62 is inserted into the insertion groove 60 to improve the sealing between the blocking plate 61 and the protection box 1 .

[0060] Example 3: Reference Fig.15 and Fig.16As shown, on the basis of Example 1 and Example 2, in order to drive the flat hot plate 23 to move so that the battery stack 11 can be taken out of the protective box 1 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 arranged in the protective box 1; specifically, the translation unit 7 includes a rectangular cavity, a sliding groove 70, a sliding plate 71, a driving plate 72 and a driving screw 73, the rectangular cavity is opened inside the protective box 1, and the sliding groove 70 is commonly opened between the limit frames 10, and the sliding groove 70 is connected with the inner top wall of the rectangular cavity, and a plurality of sliding plates 71 corresponding to 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.

[0061] The lower side of the sliding plate 71 extends into the rectangular cavity and is provided with a driving plate 72 that is slidably connected to the rectangular cavity, that is, when driven by an external force, the driving plate 72 can drive the corresponding sliding plate 71 to move in the sliding groove 70, and the sliding plate 71 can drive the corresponding flat hot plate 23 to move in the protection box 1; a driving screw rod 73 is rotatably provided on one side of the protection box 1, and one side of the driving screw rod 73 slides through the rectangular cavity and is slidably connected with several driving plates 72 until it extends to the other side of the protection box 1, and the driving screw rod 73 is threadedly connected to the driving plates 72 on the front and rear sides of the protection box 1. When the driving screw rod 73 rotates, the driving plates 72 on both sides will move in relative or opposite directions.

[0062] As can be seen from the above, by driving one side of the driving screw rod 73 with external force, the driving screw rod 73 can drive the driving plates 72 on both sides to move, so that the driving plates 72 drive the flat heat plates 23 on both sides to move synchronously, while the other driving plates 72 are slidingly connected to the driving screw rod 73, so the other corresponding flat heat plates 23 will not move. In the process of installing the battery stack 11, the flat heat plates 23 on both sides are first moved to the two sides of the protection box 1 by the driving screw rod 73, and the battery stack 11 is placed on the inner wall of the protection box 1 in turn, and is limited by the corresponding limit frame 10. Then, the flat heat plate 23 in the middle is manually pushed to move, so that the rectangular plate 20 on one side of the flat heat plate 23 can drive the thermal conductive silicon pad 22 to be close to the side of the battery stack 11.

[0063] Then the driving shaft is driven to rotate again, so that the driving screw 73 indirectly drives the flat hot plates 23 on both sides to move toward the direction of the battery stack 11, and the rectangular plates 20 on both sides are used to clamp the corresponding column of battery stacks 11 to prevent the battery stack 11 from shaking in the protective box 1, and when the flat hot plate 23 drives the cooling plate 40 to move, the cooling plate 40 will drive the sliding plate 52 to slide between the limit plates 51 through the water inlet pipe 53 and the water outlet pipe 54. Since the connecting pipe 56 is retractable, the sliding plate 52 will drive the corresponding two connecting pipes 56 to stretch, which will not affect the supply and reflux of cooling water. The sliding plate 52 is guided and moved in the limit plate 51 to prevent multiple connecting pipes 56 from contacting each other and becoming knotted or entangled.

[0064] Example 4: Reference Fig.17 and Fig.18 As shown, on the basis of Example 1, Example 2 and Example 3, in order to limit the blocking plate 61 and prevent the blocking plate 61 from detaching from the protection box 1 and the upper end of the side box 50, a limiting component 8 for the blocking plate 61 is provided on both sides of the protection box 1; specifically, the limiting component 8 includes a structural groove 80, a driving gear 81, a driving 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 protection box 1, and both sides of the driving screw rod 73 are located in the corresponding structural groove 80, both sides of the driving screw rod 73 are sleeved with a driving gear 81 located in the corresponding structural groove 80, and a driving rack 82 is also slidably arranged in the structural groove 80, that is, when the driving screw rod 73 rotates, it can drive the driving gear 81 on its outer side to rotate, and the rotation of the driving gear 81 can drive the corresponding driving rack 82 to move up and down in the structural groove 80.

[0065] The protective box 1 is symmetrically provided with limiting grooves 83 on both sides that are connected with the corresponding structural grooves 80. The inner wall of the limiting groove 83 is provided with several driven protrusions 84 distributed along its extension section. The upper side of the driving rack 82 is provided with a spring plate 85 located in the corresponding limiting groove 83 and made of elastic material. The side of the spring plate 85 close to the limiting groove 83 is provided with an active protrusion 86, and the active protrusion 86 is in contact with any one of the driven protrusions 84. That is, when the driving rack 82 moves upward, it will drive the spring plate 85 to be inserted into the limiting groove 83, and then the active protrusion 86 on the spring plate 85 will contact the driven protrusion 84 on the lower side. At this time, the driving rack 82 continues to move, and the spring plate 85 will undergo elastic deformation, driving the active protrusion 86 to be clamped on the upper side of the corresponding driven protrusion 84, thereby indirectly limiting the blocking plate 61.

[0066] When the driving screw rod 73 indirectly drives the driving plates 72 on both sides to move toward the two sides of the protection box 1, that is, the battery stack 11 is no longer limited and needs to be replaced, the driving screw rod 73 can indirectly drive the driving rack 82 to descend, and the driving rack 82 thereby indirectly drives the active protrusion 86 to no longer limit the blocking plate 61, so that the operator can remove the blocking plate 61 from the protection box 1 and the side box 50. When the battery stack 11 is replaced, the blocking plate 61 is covered on the protection box 1 and the side plate, and then the driving screw rod 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, and at the same time, the driving screw 73 drives the driving rack 82 to move upward through the driving gear 81, so that the driving rack 82 can indirectly drive the active protrusion 86 to be engaged between the corresponding driven protrusions 84. The battery stacks 11 of different widths will affect the moving stroke of the rectangular plates 20 on both sides, that is, the number of rotation circles of the driving screw 73 is inconsistent. Therefore, by providing multiple driven protrusions 84, as long as the driving rack 82 drives the active protrusion 86 to be engaged with any one of the driven protrusions 84, the sealing plate 61 can be limited.

[0067] During operation: In the first step, the operator first removes the blocking plate 61 from the upper ends of the protection box 1 and the side box 50 , so that the battery stack 11 can enter the protection box 1 , and adjusts the water pump 55 .

[0068] Step 2: Place the battery stack 11 on the inner wall of the protection box 1 in sequence, and limit the battery stack 11 by the limiting frame 10 .

[0069] Step 3: After the battery stack 11 is installed, the sealing plate 61 is covered on the upper ends of the protection box 1 and the side box 50 .

[0070] Step 4: The operator drives the driving screw 73 to rotate, so that the rectangular plates 20 on both sides move toward the battery stack 11, and at the same time, several rectangular plates 20 in the middle can move adaptively following the battery stack 11 until the rectangular plates 20 on both sides contact and press against the side surfaces of the battery stack 11.

[0071] Step 5: In the process of driving the screw rod to rotate, the limiting assembly 8 simultaneously limits the blocking plate 61 on the protection box 1 and the side box 50 to prevent them from falling.

[0072] Step 6: The heat conducting unit 2 can absorb the heat generated by the battery stack 11, and the cooling unit 4 can cool the heat conducting unit 2, so that the heat conducting unit 2 can continuously absorb the heat generated by the battery stack 11, and the circulation unit 5 can continuously circulate the cooling water in the cooling unit 4, so that the cooling water can always be maintained at an appropriate temperature.

[0073] It is obvious 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0074] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flat heat pipe for heat dissipation of a battery stack, comprising a protection box (1), characterized in that: The inner bottom wall of the protection box (1) is provided with symmetrically distributed limit frames (10), and a plurality of battery stacks (11) are also placed on the inner bottom wall of the protection box (1), and the plurality of battery stacks (11) are separated by two limit frames (10) and evenly distributed along the corresponding limit frames (10), and a heat conduction unit (2) for absorbing heat from the battery stacks (11) is also provided between the two limit 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 provided on the side of the rectangular plate (20) facing the battery stack (11); a heat conduction silicon pad (22) in contact with the outside of the battery stack (11) is provided in the rectangular groove (21).

2. A flat plate heat pipe for heat dissipation of a battery stack according to claim 1, characterized in that: A flat plate heat plate (23) is arranged on the side of the rectangular plate (20) facing away from the battery stack (11); the interior of the flat plate heat plate (23) is in a cavity shape; a plurality of partitions (24) with an inclined angle are arranged inside the flat plate heat plate (23); the partitions (24) separate the cavity area of ​​the flat plate heat plate (23) into a plurality of microchannels (25).

3. A flat heat pipe for heat dissipation of a battery stack according to claim 2, characterized in that: Several micro-wings (26) are arranged in the several micro-channels (25), and the several micro-wings (26) extend along the inclined direction of the corresponding partition (24), and the spacing between the several micro-wings (26) forms a micro-groove (27).

4. A flat heat pipe for heat dissipation of a battery stack according to claim 3, characterized in that: A wire mesh liquid wick (3) or powder sintering (30) is also provided on the inner wall of the micro groove (27).

5. The flat heat pipe for heat dissipation of a battery stack according to claim 2, characterized in that: A cooling unit (4) for cooling the flat hot plate (23) is also provided on one side thereof, the cooling unit (4) comprising a cooling plate (40) mounted on one side of the flat hot plate (23), the cooling plate (40) being L-shaped and used to accommodate the battery stack (11), and a flow channel (41) being provided in the cooling plate (40).

6. A flat plate heat pipe for heat dissipation of a battery stack according to claim 5, characterized in that: The flow channel (41) is distributed in a zigzag shape, and 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); 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).

7. The flat heat pipe for heat dissipation of a battery stack according to claim 5, characterized in that: Thermal conductive silicone grease is applied between the cooling plate (40) and the rectangular plate (20).

8. The flat heat pipe for heat dissipation of a battery stack according to claim 5, characterized in that: A side box (50) is provided through one side of the protection box (1), and a circulation unit (5) for supplying cooling water to the cooling plate (40) is provided in the side box (50). The circulation unit (5) includes limit plates (51) symmetrically arranged on the inner walls of both sides of the side box (50), and a plurality of sliding plates (52) corresponding to the cooling plates (40) are slidably arranged between the limit plates (51), and 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).

9. A flat heat pipe for heat dissipation of a battery stack according to claim 8, characterized in that: A water pump (55) is also provided on the inner wall of the side box (50), and two connecting pipes (56) are symmetrically provided on one side of the sliding plate (52) and are connected to the corresponding water inlet pipes (53) and water outlet pipes (54), and the other side of the connecting pipes (56) is connected to the water pump (55).

10. A flat heat pipe for heat dissipation of a battery stack according to claim 9, characterized in that: The connecting pipe (56) is made of a retractable material.

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