Distribution circuit board on new energy automobile

Abstract

The invention relates to the field of circuit boards, and discloses a power distribution circuit board on a new energy automobile, which comprises a new energy battery box, a new energy battery pack is placed in the new energy battery box, and the new energy battery pack is covered with a CCS integrated busbar; the CCS integrated busbar comprises an FPC (Flexible Printed Circuit) board, and the FPC board is connected with a tab of the new energy battery pack through a plurality of terminal nickel sheets; the FPC board comprises an FPC information transmission main body and a plurality of battery cell acquisition ends connected with the FPC information transmission main body, and the battery cell acquisition ends are connected with the terminal nickel sheets. Compared with the prior art, the method has the advantages that the temperature of the FPC board is integrally regulated and controlled, the FPC board is self-adaptive to heat dissipation and the like, and the problems of local high temperature of a series of battery cell acquisition ends, integral temperature regulation and control of the FPC board, high material fatigue, short material service life and the like are solved.

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 plate, and the FPC plate and the pole lug of the new energy battery pack are connected through a plurality of terminal nickel sheets.

[0010] The FPC plate includes an FPC information transmission main body and a plurality of cell collection ends connected with the FPC information transmission main body, and the cell collection end is connected with the terminal nickel sheet.

[0011] The bottom of the cell collection end is etched with a plurality of collection end copper bars, and a collection end flow channel is arranged between adjacent collection end copper bars. The collection end copper bar is hollow, and the end side wall of the collection end copper bar is respectively provided with a collection end flow channel outlet and a collection end flow channel return inlet. The bottom surface of the collection end copper bar is provided with a collection end flow channel return outlet and a collection end flow channel inlet. The bottom of the terminal nickel sheet is connected with a cooling driving assembly. The cooling driving assembly is in communication with the collection end copper bar and the collection end flow channel. The bottom of the FPC information transmission main body is etched with an FPC main body heat exchange flow channel. The FPC main body heat exchange flow channel is connected with the cell collection end through an FPC main body heat exchange connecting piece.

[0012] Preferably, the collection end flow channel inlet and the collection end flow channel outlet are in communication with the inside of the collection end copper bar. The collection end flow channel return inlet and the collection end flow channel return outlet are in communication. The collection end flow channel return inlet and the collection end flow channel return outlet are separated from the inside of the collection end copper bar.

[0013] Preferably, the cooling driving assembly includes a cooling liquid storage frame fixed at the bottom of the terminal nickel sheet. The cooling liquid storage frame is integrally connected with a side frame. The upper end of the side frame is provided with a micro circulating pump. The inside of the side frame is fixed with a flow channel cross pipe and a flow channel return cross pipe. The flow channel cross pipe and the flow channel return cross pipe are respectively connected with a plurality of flow channel inlet pipes and flow channel return inlet pipes. The output end of the micro circulating pump is connected with a cooling liquid inlet pipe between the flow channel cross pipe. The input end of the micro circulating pump is connected with a cooling liquid return pipe between the flow channel return cross pipe. The power supply end of the micro circulating pump is connected with the terminal nickel sheet through a circulating pump driving PFC. The flow channel return inlet pipe and the collection end flow channel return outlet at the bottom of the collection end copper bar are correspondingly inserted. The flow channel inlet pipe and the collection end flow channel inlet at the bottom of the collection end copper bar are correspondingly inserted.

[0014] Preferably, the FPC main body heat exchange flow channel is a series-parallel distributed flow channel etched at the bottom of the FPC information transmission main body.

[0015] Preferably, the end side wall in the part of the collection end flow channel at the bottom of the cell collection end is provided with an FPC main body heat exchange inlet. The bottom of the corresponding cell collection end is provided with an FPC main body heat exchange return port. The FPC main body heat exchange return port and the FPC main body heat exchange inlet are in communication. An automatic blocking piece is installed in the FPC main body heat exchange return port.

[0016] Preferably, the automatic plug comprises a thermal expansion tube fixed on the inner top wall of the FPC main body heat exchange backflow port, a plug head is fixed on the inner bottom opening of the FPC main body heat exchange backflow port, a piston rod is slidably installed on the bottom wall of the thermal expansion tube, the upper end of the piston rod is fixedly connected with a piston plate, the lower end of the piston rod is fixedly connected with a plug block, a tapered opening and a plug opening are respectively formed in the center of the plug head in the vertical direction, the tapered opening and the plug opening are located in the upper and lower parts of the plug head and are communicated with each other, and the tapered opening is communicated with the FPC main body heat exchange inlet.

[0017] Preferably, the FPC main body heat exchange connecting piece is a flexible plastic with a plurality of fluid passages distributed therein, and openings are formed at the ends of the flexible plastic, and the two end openings are respectively connected with the FPC main body heat exchange backflow port and the end passage of the FPC main body heat exchange flow channel.

[0018] Compared with the prior art, the present application provides a power distribution circuit board on a new energy automobile, which has the following advantages:

[0019] 1. The power distribution circuit board on the new energy automobile etches a hollow collection end copper bar and an adjacent flow channel at the bottom of the collection end of the battery cell, cooperates with the cooling driving assembly to drive pure water circulation, uses fluid flow to quickly take away heat, effectively reduces the temperature of the collection end of the battery cell, and avoids the breakage of welding points and the aging of materials caused by high temperature.

[0020] 2. The power distribution circuit board on the new energy automobile forms a heat exchange passage between the collection end of the battery cell and the flexible plastic connecting piece through the series-parallel heat exchange flow channel at the bottom of the FPC information transmission main body, transmits the heat of the collection end of the battery cell to the information transmission main body with a larger area, and dissipates the heat through the shell, thereby reducing the temperature difference between the two, relieving material fatigue, and prolonging the service life.

[0021] 3. When the collection end of the battery cell is at high temperature, the kerosene in the thermal expansion tube expands and pushes the plug block to move, automatically widens the water flow passage, increases the amount of cooling water flowing through the FPC main body heat exchange flow channel, and strengthens the heat dissipation effect; when the temperature is low, the passage is kept contracted, which is beneficial to the overall temperature rise and adapts to different environmental conditions. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an isometric structural schematic diagram of the present application;

[0023] Figure 2 It is a schematic diagram of the FPC plate structure of the present application;

[0024] Figure 3 It is a schematic diagram of the FPC plate structure of the present application;

[0025] Figure 4 It is a schematic diagram of the FPC plate structure of the present application;

[0026] Figure 5 It is the schematic view of the enlarged structure of the battery cell collection end bottom;

[0027] Figure 6 It is the schematic view of the three-dimensional structure of the cooling driving assembly;

[0028] Figure 7 It is the schematic view of the installation structure of the micro circulation pump;

[0029] Figure 8 It is the schematic view of the FPC main body heat exchange flow channel structure;

[0030] Figure 9 It is the schematic view of the FPC main body heat exchange inlet structure;

[0031] Figure 10 It is the schematic view of the automatic blocking piece installation structure;

[0032] Figure 11 It is the schematic view of the automatic blocking piece three-dimensional structure;

[0033] Figure 12 It is the schematic view of the automatic blocking piece cross-section structure.

[0034] In the figure: 1, new energy battery pack; 2, new energy battery box; 3, CCS integrated busbar; 4, terminal nickel sheet; 5, FPC board; 6, FPC information transmission main body; 7, battery cell collection end; 8, collection end flow channel outlet; 9, collection end flow channel; 10, collection end copper bar; 11, collection end flow channel backflow inlet; 12, collection end flow channel backflow outlet; 13, collection end flow channel inlet; 14, cooling driving assembly; 15, side frame; 16, cooling liquid storage frame; 17, flow channel backflow inlet pipe; 18, flow channel backflow cross pipe; 19, flow channel inlet pipe; 20, flow channel cross pipe; 21, cooling liquid backflow pipe; 22, cooling liquid inlet pipe; 23, circulation pump driving PFC; 24, micro circulation pump; 25, FPC main body heat exchange flow channel; 26, FPC main body heat exchange connecting piece; 27, FPC main body heat exchange inlet; 28, FPC main body heat exchange backflow port; 29, automatic blocking piece; 30, thermal expansion pipe; 31, plug; 32, piston plate; 33, piston rod; 34, conical opening; 35, plug; 36, blocking block. DETAILED DESCRIPTION

[0035] In actual work, the new energy battery pack 1 is closest to the cell tab and the current collector, and the temperature of the area is the highest, usually at 45-60℃ (up to 70℃ when fast charging), because the Joule heat released during the charging and discharging of the battery cell is transmitted to the battery cell collection end 7 through the tab;

[0036] The temperature of the FPC (flexible circuit board) information transmission main body 6 area far from the cell tab is low (25-35℃), because the heat dissipation path is shorter and directly contacts the module shell;

[0037] 4C charging, the temperature rise rate of the cell collection end 7 can reach 2℃ / min, and the peak temperature is 15-20℃ higher than the steady state;

[0038] In the charge-discharge cycle of -40℃-85℃, the temperature difference of the cell collection end 7 and the welding area of the terminal nickel sheet 4 fluctuates by 40℃, which aggravates material fatigue;

[0039] In addition, the thermal expansion difference between the PI base material (CTE 30ppm / ℃) at the cell collection end 7 and the copper foil (CTE 17ppm / ℃) causes the welding point to bear a stress of more than 10MPa in temperature cycling, accelerating fracture and causing local overheating;

[0040] Therefore, for the new energy battery pack 1 in actual work, the local high temperature at the cell collection end 7, and the FPC information transmission main body 6 is relatively low in temperature, if the vehicle operating environment is considered, i.e. the temperature difference between north and south, the temperature difference of the FPC board 5 is more significant in low temperature environment, and the temperature rise of the cell collection end 7 is faster and the peak temperature is higher in high temperature environment, which directly affects the welding point strength and material life, and the large temperature difference between high and low temperatures directly aggravates material fatigue and reduces service life, and the area of the cell collection end 7 is small, which is not conducive to heat dissipation.

[0041] Therefore, in order to solve the above technical problems, the application provides a power distribution circuit board on a new energy vehicle.

[0042] Embodiment one

[0043] In a typical embodiment of the application, as shown in Figures 1-7 A power distribution circuit board on a new energy vehicle includes

[0044] A new energy battery box 2, a new energy battery pack 1 is placed in the new energy battery box 2, and a CCS integrated busbar 3 (battery contact system / integrated busbar) is mounted on the new energy battery pack 1, the CCS integrated busbar 3 includes an FPC board 5, the FPC board 5 and the tab of the new energy battery pack 1 are connected through a plurality of terminal nickel sheets 4, the FPC board 5 includes an FPC information transmission main body 6 and a plurality of cell collection ends 7 connected with the FPC information transmission main body 6, and the cell collection end 7 is connected with the terminal nickel sheet 4;

[0045] The above features are the basic installation structure of the FPC plate 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 of the cell collection end 7 is accumulated, while the temperature of the FPC information transmission main body 6 is relatively low. However, the area of the FPC information transmission main body 6 is large, and the FPC information transmission main body 6 can be quickly cooled through the shell heat conduction. However, the connection part of the cell collection end 7 and the terminal nickel sheet 4 is too high in temperature, which may cause the difference in material expansion rate, resulting in the separation of the welding point.

[0046] Therefore, based on the above actual problems, the bottom of the cell collection end 7 is etched with a plurality of collection end copper bars 10, the adjacent collection end copper bars 10 are provided with a collection end flow channel 9, the collection end copper bar 10 is hollow, the two end sidewalls of the collection end copper bar 10 are respectively provided with a collection end flow channel outlet 8 and a collection end flow channel backflow inlet 11, the bottom surface of the collection end copper bar 10 is provided with a collection end flow channel backflow outlet 12 and a collection end flow channel inlet 13, the bottom of the terminal nickel sheet 4 is connected with a cooling driving assembly 14, the cooling driving assembly 14 is communicated with the collection end copper bar 10 and the collection end flow channel 9, the bottom of the FPC information transmission main body 6 is etched with an FPC main body heat exchange flow channel 25, the FPC main body heat exchange flow channel 25 is connected with the cell collection end 7 through an FPC main body heat exchange connecting piece 26, the collection end flow channel inlet 13 and the collection end flow channel outlet 8 are both communicated with the inside of the collection end copper bar 10, the collection end flow channel backflow inlet 11 and the collection end flow channel backflow outlet 12 are communicated, and the collection end flow channel backflow inlet 11 and the collection end flow channel backflow outlet 12 are separated from the inside of the collection end copper bar 10, the cooling driving assembly 14 comprises a cooling liquid storage frame 16 fixed at the bottom of the terminal nickel sheet 4, the cooling liquid storage frame 16 is integrally connected with a side frame 15, a micro circulating pump 24 is installed at the upper end of the side frame 15, a flow channel cross pipe 20 and a flow channel backflow cross pipe 18 are fixed in the inside of the side frame 15, a plurality of flow channel inlet pipes 19 and flow channel backflow inlet pipes 17 are connected with the flow channel cross pipe 20 and the flow channel backflow cross pipe 18 respectively, a cooling liquid inlet pipe 22 is connected between the output end of the micro circulating pump 24 and the flow channel cross pipe 20, a cooling liquid backflow pipe 21 is connected between the input end of the micro circulating pump 24 and the flow channel backflow cross pipe 18, a circulating pump driving PFC 23 is connected between the power supply end of the micro circulating pump 24 and the terminal nickel sheet 4, the flow channel backflow inlet pipe 17 and the collection end flow channel backflow outlet 12 at the bottom of the collection end copper bar 10 are correspondingly inserted, and the flow channel inlet pipe 19 and the collection end flow channel inlet 13 at the bottom of the collection end copper bar 10 are correspondingly inserted.

[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 Figures 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 purpose, the FPC main body heat exchange channel 25 in the application is a series-parallel distributed channel etched in the bottom of the FPC information transmission main body 6. The FPC main body heat exchange inlet 27 is arranged on the side wall of the end portion in the partial collection end channel 9 at the bottom of the battery cell collection end 7. The FPC main body heat exchange return port 28 corresponding to the bottom of the battery cell collection end 7 is arranged. The FPC main body heat exchange return port 28 is in communication with the FPC main body heat exchange inlet 27. The automatic blocking piece 29 is installed in the FPC main body heat exchange return port 28. The automatic blocking piece 29 includes the thermal expansion tube 30 fixed on the top wall in the FPC main body heat exchange return port 28. The plug 31 is fixed on the bottom opening in the FPC main body heat exchange return port 28. The piston rod 33 is slidingly installed on the bottom wall of the thermal expansion tube 30. The piston plate 32 is fixedly connected to the upper end of the piston rod 33. The blocking block 36 is fixedly connected to the lower end of the piston rod 33. The tapered opening 34 and the plug 35 are respectively arranged in the center of the plug 31 in the vertical direction. The tapered opening 34 and the plug 35 are located in the upper and lower parts of the plug 31 and are in communication with each other. The tapered opening 34 is in communication with the FPC main body heat exchange inlet 27. The FPC main body heat exchange connecting piece 26 is a flexible plastic with several fluid passages arranged inside. The end portion is provided with an opening. The two end openings are respectively connected with the end passage of the FPC main body heat exchange return port 28 and the FPC main body heat exchange channel 25.

[0056] Specifically, based on the above features, in actual work, if the temperature of the battery cell collection end 7 is too high, including the influence of the environmental temperature, or the abnormal increase of the contact resistance and the increase of the current, in addition to the heat dissipation of the battery cell collection end 7 by the first embodiment, after the heat exchange between the pure water and the battery cell collection end 7, the temperature of the pure water will also increase. The increased temperature is transferred to the thermal expansion tube 30. The thermal expansion tube 30 is filled with kerosene with high thermal sensitivity. The volume of the kerosene expands and pushes the piston plate 32 and the blocking block 36 connected thereto to move downward until the bottom of the blocking block 36 is flush with the bottom of the plug 35. At this time, the plug 35 is in communication with the tapered opening 34 above it. The pure water flows out of the collection end channel outlet 8. In addition to the backflow, it also flows out through the plug 35, flows along the fluid passage in the FPC main body heat exchange connecting piece 26, and flows through the FPC main body heat exchange channel 25. Finally, it flows back to the collection end channel 9 through the FPC main body heat exchange connecting piece 26, realizing the widening of the pure water passage.

[0057] In this process, the heat in the pure water will be transferred to the FPC information transmission body 6 when flowing along the FPC body heat exchange channel 25, thereby increasing the overall temperature of the FPC information transmission body 6 and realizing heat exchange between the electric core collection end 7 and the FPC information transmission body 6. The heat can be quickly transferred to realize cooling, and the cooling of the electric core collection end 7 can be accelerated, so that the temperature is not too high, the temperature peak value is kept low, and the overall temperature of the FPC plate 5 is controlled.

[0058] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application 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 terminal (7) is etched with several acquisition terminal copper busbars (10), and an acquisition terminal flow channel (9) is provided between adjacent acquisition terminal copper busbars (10). The acquisition terminal copper busbars (10) are hollow. The two side walls of the acquisition terminal copper busbars (10) are respectively provided with acquisition terminal flow channel outlet (8) and acquisition terminal flow channel return inlet (11). The bottom surface of the acquisition terminal copper busbars (10) is provided with acquisition terminal flow channel return outlet (12) and acquisition terminal 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), acquisition terminal copper busbars (10), and acquisition terminal flow channel (9) are connected. 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 terminal (7) are connected by an FPC body heat exchange connector (26).

2. The power distribution circuit board for a new energy vehicle according to claim 1, characterized in that: 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 outlet (12) of the acquisition end flow channel are connected. The return inlet (11) and outlet (12) of the acquisition end flow channel are separated from the inside of the acquisition end copper busbar (10).

3. The power distribution circuit board for a new energy vehicle according to claim 2, characterized in that: 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 on 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 inserted. The flow channel inlet pipe (19) and the bottom of the acquisition end copper busbar (10) are correspondingly inserted.

4. The power distribution circuit board for a new energy vehicle according to claim 3, 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).

5. The power distribution circuit board for a new energy vehicle according to claim 4, characterized in that: An FPC main body heat exchange inlet (27) is provided on the end side wall of a portion of the collection end channel (9) at the bottom of the cell collection end (7). An FPC main body heat exchange return port (28) is provided at the bottom of the cell collection 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 in the FPC main body heat exchange return port (28).

6. The power distribution circuit board for a new energy vehicle according to claim 5, 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.

7. A power distribution circuit board for a new energy vehicle according to claim 6, 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 FPC body heat exchange return port (28) and the end passage of the FPC body heat exchange channel (25).

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