A power distribution circuit board on a new energy vehicle

Abstract

This invention relates to the field of circuit boards and discloses a power distribution circuit board for new energy vehicles, including a new energy battery box containing a new energy battery pack. The new energy battery pack is covered with a CCS integrated busbar. The CCS integrated busbar includes an FPC board, and the FPC board and the tabs of the new energy battery pack are connected by several terminal nickel plates. The FPC board includes an FPC information transmission main body and several cell acquisition terminals connected to the FPC information transmission main body, wherein the cell acquisition terminals are connected to the terminal nickel plates. Compared with the prior art, this application has advantages such as achieving overall temperature control of the FPC board and adaptive heat dissipation of the FPC board, solving problems such as local high temperature at the cell acquisition terminals, overall temperature control of the FPC board, high material fatigue, and short material life.

Description

Technical Field

[0001] This invention relates to the field of circuit boards, specifically to a power distribution circuit board for new energy vehicles. Background Technology

[0002] In the power distribution system of new energy vehicle battery packs, the FPC board, as a core component, undertakes the critical functions of cell status monitoring and signal transmission, and its stable operation directly affects the safety and lifespan of the battery pack. However, existing FPC boards face significant thermal management challenges in practical operation.

[0003] Specifically, during battery pack operation, the FPC cell acquisition end, located near the cell tabs, directly receives Joule heat generated by the cell's charging and discharging, and its temperature often reaches 45-60℃, even rising to 70℃ during fast charging. In contrast, the FPC information transmission body, located further away from the tabs, has a shorter heat dissipation path and is in direct contact with the module casing, resulting in a temperature of only 25-35℃, creating a significant temperature difference. Under high-intensity operating conditions such as 4C charging, the temperature rise rate of the cell acquisition end can reach 2℃ / min, with the peak temperature 15-20℃ higher than the steady-state temperature, further exacerbating the risk of localized overheating.

[0004] Furthermore, during charge-discharge cycles ranging from -40℃ to 85℃, the temperature difference between the soldering area of ​​the cell's acquisition end and the terminal nickel sheet fluctuates by up to 40℃, significantly exacerbating material fatigue. Simultaneously, the significant difference in thermal expansion between the PI substrate (CTE 30ppm / ℃) and the copper foil (CTE 17ppm / ℃) at the cell's acquisition end causes the solder joints to withstand stresses exceeding 10MPa, easily leading to fracture and localized overheating. In addition, the small area and poor heat dissipation of the cell's acquisition end exacerbate the temperature differences in the FPC board under extreme environments (such as temperature differences between northern and southern regions), directly affecting solder joint strength and material lifespan, thus shortening the overall service life.

[0005] Therefore, based on the above problems, the present invention provides a power distribution circuit board for new energy vehicles. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a power distribution circuit board for new energy vehicles, which has advantages such as overall temperature control of the FPC board and adaptive heat dissipation of the FPC board. It solves problems such as local high temperature at the acquisition end of the battery cells, overall temperature control of the FPC board, high material fatigue, and short material life.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a power distribution circuit board for new energy vehicles, comprising...

[0008] The new energy battery box contains a new energy battery pack, and the new energy battery pack is covered with a CCS integrated busbar.

[0009] The CCS integrated busbar includes an FPC board, and the FPC board and the tabs of the new energy battery pack are connected by several terminal nickel sheets.

[0010] The FPC board includes an FPC information transmission main body and several battery cell acquisition terminals connected to the FPC information transmission main body. The battery cell acquisition terminals are connected to terminal nickel plates.

[0011] The bottom of the cell acquisition terminal is etched with several acquisition terminal copper busbars. Acquisition terminal flow channels are set between adjacent acquisition terminal copper busbars. The acquisition terminal copper busbars are hollow. Acquisition terminal flow channel outlets and acquisition terminal flow channel return inlets are respectively opened on the two end side walls of the acquisition terminal copper busbars. Acquisition terminal flow channel return outlets and acquisition terminal flow channel inlets are opened on the bottom surface of the acquisition terminal copper busbars. The bottom of the terminal nickel sheet is connected to a cooling drive assembly. The cooling drive assembly is connected to the acquisition terminal copper busbars and acquisition terminal flow channels. The bottom of the FPC information transmission body is etched with FPC body heat exchange flow channels. The FPC body heat exchange flow channels and the cell acquisition terminal are connected by FPC body heat exchange connectors.

[0012] Preferably, the inlet and outlet of the acquisition end flow channel are both connected to the interior of the acquisition end copper busbar, the return inlet and outlet of the acquisition end flow channel are connected, and the return inlet and outlet of the acquisition end flow channel are separated from the interior of the acquisition end copper busbar.

[0013] Preferably, the cooling drive assembly includes a coolant reservoir frame fixed to the bottom of the terminal nickel sheet. The coolant reservoir frame is integrally connected to a side frame. A micro circulation pump is installed at the upper end of the side frame. A flow channel horizontal pipe and a flow channel return horizontal pipe are fixed inside the side frame. The flow channel horizontal pipe and the flow channel return horizontal pipe are respectively connected to a plurality of flow channel inlet pipes and flow channel return inlet pipes. A coolant inlet pipe is connected between the output end of the micro circulation pump and the flow channel horizontal pipe. A coolant return pipe is connected between the input end of the micro circulation pump and the flow channel return horizontal pipe. The power supply end of the micro circulation pump and the terminal nickel sheet are connected through a circulation pump drive PFC. The flow channel return inlet pipe is correspondingly inserted into the flow channel return outlet at the bottom of the acquisition end copper busbar. The flow channel inlet pipe is correspondingly inserted into the flow channel inlet at the bottom of the acquisition end copper busbar.

[0014] Preferably, the heat exchange channels of the FPC body are channels etched in series and parallel on the bottom of the FPC information transmission body.

[0015] Preferably, an FPC body heat exchange inlet is provided on the end side wall of a portion of the collection end channel at the bottom of the cell collection end, and an FPC body heat exchange return port is provided at the bottom of the cell collection end corresponding to the FPC body heat exchange inlet. The FPC body heat exchange return port and the FPC body heat exchange inlet are connected, and an automatic plug is installed in the FPC body heat exchange return port.

[0016] Preferably, the automatic plugging component includes a thermal expansion tube fixed to the top wall of the heat exchange return port of the FPC body, a plug fixed to the bottom opening of the heat exchange return port of the FPC body, a piston rod slidably installed on the bottom wall of the thermal expansion tube, a piston plate fixedly connected to the upper end of the piston rod, and a plug fixedly connected to the lower end of the piston rod. The center of the plug has a conical opening and a plug in the vertical direction, the conical opening and the plug are located in the upper and lower parts of the plug and are interconnected, and the conical opening is connected to the heat exchange inlet of the FPC body.

[0017] Preferably, the FPC body heat exchange connector is a flexible plastic with several fluid passages distributed inside, and its end is provided with an opening. The two openings are respectively connected to the FPC body heat exchange return port and the end passage of the FPC body heat exchange flow channel.

[0018] Compared with the prior art, the present invention provides a power distribution circuit board for new energy vehicles, which has the following beneficial effects:

[0019] 1. The power distribution circuit board for a new energy vehicle has a hollow copper busbar and adjacent flow channels etched at the bottom of the battery cell acquisition end. Combined with a cooling drive component to drive pure water circulation, the fluid flow quickly removes heat, effectively reducing the temperature of the battery cell acquisition end and avoiding solder joint breakage and material aging caused by high temperature.

[0020] 2. The power distribution circuit board in this new energy vehicle forms a heat exchange path with the battery cell acquisition end through the series and parallel heat exchange channels at the bottom of the FPC information transmission body and the flexible plastic connector. The heat of the battery cell acquisition end is transferred to the larger information transmission body and dissipated through the shell, reducing the temperature difference between the two, alleviating material fatigue, and extending service life.

[0021] 3. In this type of power distribution circuit board for new energy vehicles, when the battery cell acquisition end is at a high temperature, the kerosene in the thermal expansion tube expands due to heat, pushing the block to move and automatically widening the water flow path, increasing the amount of cooling water flowing through the heat exchange channel of the FPC body, and enhancing the heat dissipation effect; when the temperature is low, the passage remains contracted, which is conducive to the overall temperature increase and adapts to different environmental conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the isometric three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the FPC board of the present invention;

[0024] Figure 3 This is a partially enlarged structural diagram of the FPC board of the present invention;

[0025] Figure 4 This is an enlarged structural diagram of the bottom portion of the FPC board of the present invention;

[0026] Figure 5 This is an enlarged schematic diagram of the bottom structure of the battery cell acquisition terminal of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the cooling drive assembly of the present invention;

[0028] Figure 7 This is a schematic diagram of the installation structure of the micro circulating pump of the present invention;

[0029] Figure 8 This is a schematic diagram of the heat exchange channel structure of the FPC body of the present invention;

[0030] Figure 9 This is a schematic diagram of the heat exchange inlet structure of the FPC body of the present invention;

[0031] Figure 10 This is a schematic diagram of the automatic plug installation structure of the present invention;

[0032] Figure 11 This is a three-dimensional structural diagram of the automatic plugging component of the present invention;

[0033] Figure 12 This is a schematic diagram of the cross-sectional structure of the automatic plug of the present invention.

[0034] In the diagram: 1. New energy battery pack; 2. New energy battery box; 3. CCS integrated busbar; 4. Terminal nickel strip; 5. FPC board; 6. FPC information transmission main body; 7. Cell acquisition end; 8. Acquisition end flow channel outlet; 9. Acquisition end flow channel; 10. Acquisition end copper busbar; 11. Acquisition end flow channel return inlet; 12. Acquisition end flow channel return outlet; 13. Acquisition end flow channel inlet; 14. Cooling drive assembly; 15. Side frame; 16. Coolant reservoir; 17. Flow channel return inlet pipe; 18. Flow channel return... 19. Flow channel inlet pipe; 20. Flow channel horizontal pipe; 21. Coolant return pipe; 22. Coolant inlet pipe; 23. Circulation pump driven PFC; 24. Micro circulation pump; 25. FPC body heat exchange flow channel; 26. FPC body heat exchange connector; 27. FPC body heat exchange inlet; 28. FPC body heat exchange return port; 29. ​​Automatic plug; 30. Thermal expansion tube; 31. Plug; 32. Piston plate; 33. Piston rod; 34. Conical opening; 35. Plug; 36. Plug block. Detailed Implementation

[0035] When the new energy battery pack 1 is working, the area near the cell tabs and current collector has the highest temperature, usually 45-60℃ (up to 70℃ during fast charging), because the Joule heat released during the charging and discharging of the cell is transferred to the cell collection end 7 through the tabs.

[0036] The temperature of the FPC (Flexible Printed Circuit Board) information transmission main body 6, which is far away from the battery cell tabs, is lower (25-35℃) because the heat dissipation path is shorter and it is in direct contact with the module shell.

[0037] During 4C charging, the temperature rise rate of the cell's acquisition terminal 7 can reach 2℃ / min, and the peak temperature is 15-20℃ higher than the steady state temperature.

[0038] During charge-discharge cycles of -40℃ to 85℃, the temperature difference between the welding areas of the cell acquisition end 7 and the terminal nickel sheet 4 fluctuates by up to 40℃, which exacerbates material fatigue.

[0039] In addition, the difference in thermal expansion between the PI substrate (CTE 30ppm / ℃) and the copper foil (CTE 17ppm / ℃) at the 7th point of the battery cell collection end causes the solder joint to be subjected to stress of more than 10MPa during temperature cycling, which accelerates the fracture and causes local overheating.

[0040] Therefore, in actual operation, the cell acquisition end 7 of the new energy battery pack 1 experiences localized high temperatures, while the FPC information transmission body 6 has a lower temperature. Considering the vehicle's operating environment, i.e., the temperature difference between the north and south, the temperature difference of the FPC board 5 is more significant in low-temperature operating environments, while in high-temperature operating environments, the cell acquisition end 7 heats up faster and has a higher peak temperature, directly affecting the strength of the solder joints and the lifespan of the materials. Furthermore, the large difference between high and low temperatures directly exacerbates material fatigue and reduces the service life. In addition, the small area of ​​the cell acquisition end 7 is not conducive to heat dissipation.

[0041] Therefore, in order to solve the above-mentioned technical problems, this application proposes a power distribution circuit board for new energy vehicles.

[0042] Example 1

[0043] In one typical implementation of this application, such as Figure 1-7 As shown, a power distribution circuit board for a new energy vehicle includes...

[0044] The new energy battery box 2 contains a new energy battery pack 1. The new energy battery pack 1 is covered with a CCS integrated busbar 3 (battery contact system / integrated busbar). The CCS integrated busbar 3 includes an FPC board 5. The FPC board 5 and the tabs of the new energy battery pack 1 are connected by several terminal nickel plates 4. The FPC board 5 includes an FPC information transmission body 6 and several cell acquisition terminals 7 connected to the FPC information transmission body 6. The cell acquisition terminals 7 are connected to the terminal nickel plates 4.

[0045] The above features are the basic installation structure of FPC board 5. When the new energy battery pack 1 is working, the two ends of the terminal nickel sheet 4 will generate high temperature, and the temperature will accumulate at the cell acquisition end 7. The temperature of the FPC information transmission body 6 is relatively low. However, the FPC information transmission body 6 has a large area and can be cooled down quickly through heat conduction from the shell. The connection between the cell acquisition end 7 and the terminal nickel sheet 4 may be too hot, which may cause the difference in material expansion rate and cause the solder joint to detach.

[0046] Therefore, based on the above practical problems, the bottom of the battery cell acquisition terminal 7 in this invention is etched with several acquisition terminal copper busbars 10, and acquisition terminal flow channels 9 are provided between adjacent acquisition terminal copper busbars 10. The acquisition terminal copper busbars 10 are hollow, and acquisition terminal flow channel outlets 8 and acquisition terminal flow channel return inlets 11 are respectively opened on the side walls at both ends of the acquisition terminal copper busbars 10. Acquisition terminal flow channel return outlets 12 and acquisition terminal flow channel inlets 13 are opened on the bottom surface of the acquisition terminal copper busbars 10. The bottom of the terminal nickel sheet 4 is connected to a cooling drive assembly. Component 14, cooling drive assembly 14, and acquisition end copper busbar 10 and acquisition end flow channel 9 are connected. The bottom of the FPC information transmission body 6 is etched with FPC body heat exchange flow channel 25. The FPC body heat exchange flow channel 25 and the battery cell acquisition end 7 are connected by FPC body heat exchange connector 26. The acquisition end flow channel inlet 13 and acquisition end flow channel outlet 8 are both connected to the inside of the acquisition end copper busbar 10. The acquisition end flow channel return inlet 11 and acquisition end flow channel return outlet 12 are connected. Inlet 11 and collector end flow channel return outlet 12 are separated from the inside of collector end copper busbar 10. Cooling drive assembly 14 includes a coolant reservoir 16 fixed to the bottom of terminal nickel sheet 4. The coolant reservoir 16 is integrally connected to a side frame 15. A micro circulation pump 24 is installed at the upper end of the side frame 15. Flow channel horizontal pipe 20 and flow channel return horizontal pipe 18 are fixed inside the side frame 15. Flow channel horizontal pipe 20 and flow channel return horizontal pipe 18 are respectively connected to several flow channel inlet pipes 19 and flow channel return inlet pipes 17. A coolant inlet pipe 22 is connected between the output end of the ring pump 24 and the horizontal pipe 20 of the flow channel. A coolant return pipe 21 is connected between the input end of the micro circulation pump 24 and the horizontal pipe 18 of the flow channel. The power supply end of the micro circulation pump 24 and the terminal nickel plate 4 are connected through the circulation pump drive PFC 23. The flow channel return inlet pipe 17 and the flow channel return outlet 12 at the bottom of the acquisition end copper busbar 10 are correspondingly plugged in. The flow channel inlet pipe 19 and the flow channel inlet 13 at the bottom of the acquisition end copper busbar 10 are correspondingly plugged in.

[0047] In actual operation, the micro circulation pump 24 is driven synchronously. The coolant reservoir 16 contains pure water. Due to heat conduction and to avoid short circuit, the micro circulation pump 24 draws out the pure water and pumps it into the collector end copper busbar 10 through the collector end inlet 13 via the coolant inlet pipe 22 and its connected flow channel horizontal pipe 20 and flow channel inlet pipe 19. The pure water flows along the collector end copper busbar 10 and flows out from the collector end flow channel outlet 8 and along the collector end flow channel 9. Subsequently, the pure water enters from the collector end flow channel return inlet 11 and flows back through the collector end flow channel return outlet 12 to the flow channel return inlet pipe 17 and its connected flow channel return horizontal pipe 18 and coolant return pipe 21. Finally, it flows back into the coolant reservoir 16, realizing the circulation of pure water. During this process, the heat at the collector end 7 of the battery cell is transferred through the pure water.

[0048] It is worth mentioning that a semiconductor cooling plate is also installed between the coolant reservoir 16 and the terminal nickel plate 4. The semiconductor cooling plate is directly powered through the terminal nickel plate 4, and the cooling end of the semiconductor cooling plate is in close contact with the upper surface of the coolant reservoir 16 for cooling the pure water in the coolant reservoir 16.

[0049] It is worth mentioning that the coolant reservoir 16 and its connected side frame 15 are made of thermally conductive ceramic;

[0050] It is worth mentioning that the copper busbar 10 at the acquisition end is formed into a regular fin structure on the PI substrate using deep reactive ion etching (DRIE) process, and a polyimide (PI) film with a thickness of 25-50μm is also covered on its bottom.

[0051] It is worth mentioning that when the end of the terminal nickel sheet 4 is spot-welded to the battery cell acquisition end 7, the flow channel return pipe 17 and the flow channel inlet pipe 19 are first inserted into the acquisition end flow channel return outlet 12 and the acquisition end flow channel inlet 13 respectively.

[0052] Example 2

[0053] like Figure 7-12 As shown in this embodiment, when the new energy battery pack 1 is actually working, there is a large temperature difference between the FPC information transmission body 6 and the cell acquisition end 7 in the FPC board 5. Therefore, the cell acquisition end 7 and the FPC information transmission body 6 can actually exchange heat. In this case, the temperature of the cell acquisition end 7 can be quickly reduced by the FPC information transmission body 6, and the FPC information transmission body 6 can be quickly cooled by the shell without affecting the material properties of the FPC information transmission body 6.

[0054] In addition, in low-temperature environments, the overall temperature of the FPC information transmission body 6 can be increased simultaneously, and then the temperature can be transferred to the entire battery box through the battery box shell, thereby increasing the operating temperature of the new energy battery pack 1 and reducing the impact of low temperature on battery life.

[0055] Therefore, based on the above objectives, the FPC main body heat exchange channel 25 in this invention is a series-parallel distributed channel etched on the bottom of the FPC information transmission main body 6. An FPC main body heat exchange inlet 27 is opened on the end sidewall of a portion of the acquisition end channel 9 at the bottom of the battery cell acquisition end 7. An FPC main body heat exchange return port 28 is opened at the bottom of the battery cell acquisition end 7 corresponding to the FPC main body heat exchange inlet 27. The FPC main body heat exchange return port 28 and the FPC main body heat exchange inlet 27 are connected. An automatic plug 29 is installed inside the FPC main body heat exchange return port 28. The automatic plug 29 includes a thermal expansion tube 30 fixed to the top wall inside the FPC main body heat exchange return port 28. A plug 31 is fixed to the bottom opening. A piston rod 33 is slidably installed on the bottom wall of the thermal expansion tube 30. A piston plate 32 is fixedly connected to the upper end of the piston rod 33, and a plug block 36 is fixedly connected to the lower end of the piston rod 33. A conical opening 34 and a plug 35 are respectively opened in the center of the plug 31 in the vertical direction. The conical opening 34 and the plug 35 are located in the upper and lower parts of the plug 31 and are interconnected. The conical opening 34 is connected to the heat exchange inlet 27 of the FPC body. The heat exchange connector 26 of the FPC body is a flexible plastic with several fluid passages distributed inside. An opening is opened at its end. The two openings are respectively connected to the heat exchange return port 28 of the FPC body and the end passage of the heat exchange flow channel 25 of the FPC body.

[0056] Specifically, based on the above characteristics, in actual operation of the new energy battery pack 1, if the temperature of the cell acquisition end 7 is too high, including the influence of ambient temperature, or the abnormal increase in contact resistance and current, in addition to heat dissipation of the cell acquisition end 7 through the method of embodiment one, at this time, after the pure water exchanges heat with the cell acquisition end 7, the temperature of the pure water will also increase. The increased temperature is transferred to the thermal expansion tube 30, which is filled with kerosene with high heat sensitivity. The kerosene expands in volume and pushes the piston plate 32 and its connected plug 36 downward until the bottom of the plug 36 is flush with the bottom of the plug 35. At this time, the plug 35 is connected to the conical opening 34 above it. The pure water flows out from the outlet 8 of the acquisition end flow channel. In addition to the return flow, it also flows out through the plug 35 and flows along the fluid passage in the FPC body heat exchange connector 26, and flows through the FPC body heat exchange flow channel 25. Finally, it flows back to the acquisition end flow channel 9 through the FPC body heat exchange connector 26, thereby widening the pure water passage.

[0057] During this process, as the heat in the pure water flows along the heat exchange channel 25 of the FPC main body, it is transferred to the FPC information transmission main body 6, raising the overall temperature of the FPC information transmission main body 6 and realizing heat exchange between the cell acquisition end 7 and the FPC information transmission main body 6. This heat can be quickly transferred through the shell to achieve cooling, and can also accelerate the cooling of the cell acquisition end 7, preventing its temperature from becoming too high and keeping its temperature peak at the bottom index, thereby achieving overall temperature control of the FPC board 5.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power distribution circuit board for a new energy vehicle, characterized in that: include New energy battery box (2), new energy battery pack (1) is placed inside the new energy battery box (2), and CCS integrated busbar (3) is installed on the new energy battery pack (1). The CCS integrated busbar (3) includes an FPC board (5), and the FPC board (5) and the tabs of the new energy battery pack (1) are connected by several terminal nickel sheets (4). The FPC board (5) includes an FPC information transmission body (6) and several battery cell acquisition terminals (7) connected to the FPC information transmission body (6), wherein the battery cell acquisition terminals (7) are connected to the terminal nickel plates (4); The bottom of the battery cell acquisition end (7) is etched with several acquisition end copper busbars (10), and an acquisition end flow channel (9) is provided between adjacent acquisition end copper busbars (10). The acquisition end copper busbars (10) are hollow. The two side walls of the acquisition end copper busbars (10) are respectively provided with acquisition end flow channel outlet (8) and acquisition end flow channel return inlet (11). The bottom surface of the acquisition end copper busbars (10) is provided with acquisition end flow channel return outlet (12) and acquisition end flow channel inlet (13). The bottom of the terminal nickel sheet (4) is connected to a cooling drive assembly (14). The cooling drive assembly (14) is connected to the acquisition end copper busbars (10) and the acquisition end flow channel (9). The bottom of the FPC information transmission body (6) is etched with an FPC body heat exchange flow channel (25). The FPC body heat exchange flow channel (25) and the battery cell acquisition end (7) are connected by an FPC body heat exchange connector (26). The inlet (13) and outlet (8) of the acquisition end flow channel are both connected to the inside of the acquisition end copper busbar (10). The return inlet (11) and return outlet (12) of the acquisition end flow channel are connected. The return inlet (11) and return outlet (12) of the acquisition end flow channel are separated from the inside of the acquisition end copper busbar (10). The cooling drive assembly (14) includes a coolant reservoir (16) fixed to the bottom of the terminal nickel sheet (4). The coolant reservoir (16) is integrally connected to a side frame (15). A micro circulation pump (24) is installed at the upper end of the side frame (15). A flow channel horizontal pipe (20) and a flow channel return horizontal pipe (18) are fixed inside the side frame (15). The flow channel horizontal pipe (20) and the flow channel return horizontal pipe (18) are respectively connected to several flow channel inlet pipes (19) and flow channel return inlet pipes (17). The output end of the micro circulation pump (24) and the flow channel horizontal pipe are connected to the flow channel horizontal pipe. A coolant inlet pipe (22) is connected between the pipes (20). A coolant return pipe (21) is connected between the input end of the micro circulation pump (24) and the flow channel return horizontal pipe (18). The power supply end of the micro circulation pump (24) and the terminal nickel plate (4) are connected through the circulation pump drive PFC (23). The flow channel return inlet pipe (17) and the bottom of the acquisition end copper busbar (10) are correspondingly plugged in. The flow channel inlet pipe (19) and the bottom of the acquisition end copper busbar (10) are correspondingly plugged in.

2. The power distribution circuit board for a new energy vehicle according to claim 1, characterized in that: The heat exchange channels (25) of the FPC body are channels etched in series and parallel on the bottom of the FPC information transmission body (6).

3. The power distribution circuit board for a new energy vehicle according to claim 2, characterized in that: The end side wall of the bottom part of the collection end channel (9) of the cell collection end (7) is provided with an FPC body heat exchange inlet (27). The bottom of the cell collection end (7) corresponding to the FPC body heat exchange inlet (27) is provided with an FPC body heat exchange return port (28). The FPC body heat exchange return port (28) and the FPC body heat exchange inlet (27) are connected. An automatic plug (29) is installed in the FPC body heat exchange return port (28).

4. The power distribution circuit board for a new energy vehicle according to claim 3, characterized in that: The automatic plug (29) includes a thermal expansion tube (30) fixed to the top wall of the heat exchange return port (28) of the FPC body. A plug (31) is fixed to the bottom opening of the heat exchange return port (28) of the FPC body. A piston rod (33) is slidably installed on the bottom wall of the thermal expansion tube (30). A piston plate (32) is fixedly connected to the upper end of the piston rod (33). A plug block (36) is fixedly connected to the lower end of the piston rod (33). A conical opening (34) and a plug (35) are respectively opened in the center of the plug (31) in the vertical direction. The conical opening (34) and the plug (35) are located in the upper and lower parts of the plug (31) and are interconnected. The conical opening (34) is connected to the heat exchange inlet (27) of the FPC body.

5. The power distribution circuit board for a new energy vehicle according to claim 4, characterized in that: The FPC body heat exchange connector (26) is a flexible plastic with several fluid passages distributed inside. It has an opening at its end, and the two openings are respectively connected to the end passages of the FPC body heat exchange return port (28) and the FPC body heat exchange flow channel (25).

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