Battery pack adopting distributed acquisition large module scheme

Abstract

The invention relates to the technical field of battery packs, in particular to a battery pack adopting a distributed acquisition large module scheme. Comprising a lower shell and a liquid cooling plate embedded in the inner bottom wall of the lower shell; the side wall of the lower housing is provided with an electrical plug-in and a BDU. The electrical plug-in is connected with the whole vehicle interface; according to the invention, by integrating the voltage and temperature acquisition and processing function modules in the CCS assembly, the large simplification of the external wiring harness of the module and the comprehensive improvement of the system performance are realized, the acquisition and processing functions are directly integrated through the CCS assembly, the tedious external wiring harness is thoroughly eliminated, the number and complexity of the wiring harness are greatly reduced, and the cost is reduced. The overall weight and cost of the system are reduced; as an acquisition board and a large number of wire harnesses outside the module are cancelled, the internal space of the power battery pack is utilized more effectively, so that more battery cells can be accommodated or a more compact design is adopted, and the energy density of a battery system is directly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack adopting a distributed acquisition large module solution. Background Art

[0002] With the booming new energy vehicle industry around the world, battery integration technology has become a key force driving the development of this field. The popularity of new energy vehicles has directly driven the demand for more efficient and safer battery systems, thus prompting the rapid development of advanced technologies such as FPC (flexible printed circuit board), CCS (cell connection system), and CTP (cell to pack).

[0003] In traditional battery systems, each module or cell requires a separate voltage and temperature sensor harness to be connected to an external BMS (battery management system) acquisition board, which makes the external harness complex. In addition, due to the large number of harnesses and acquisition boards outside the module, the space cannot be effectively utilized and the energy density of the battery system is low.

[0004] The liquid cooling plate in the battery pack is used to cool the batteries in the battery pack. The coolant flows along the liquid inlet of the liquid cooling plate into the cooling channel on the cooling plate, thereby exchanging the heat transferred from the battery to the cooling plate. The coolant in the cooling channel flows along the liquid outlet and is cooled and then circulated back into the cooling channel. The coolant is recycled and passes through the cooling channel. Long-term use will cause precipitation and other impurities in the cooling channel of the liquid cooling plate. The impurities will adhere to the inner wall of the cooling channel, eventually leading to blockage of the cooling channel in the liquid cooling plate, thereby affecting the heat dissipation of the battery pack. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention proposes a battery pack using a large module solution with distributed acquisition. The present invention integrates voltage, temperature acquisition and processing functional modules in the CCS assembly, thereby achieving a significant simplification of the wiring harness outside the module and a comprehensive improvement in system performance. By directly integrating the acquisition and processing functions into the CCS assembly, these cumbersome external wiring harnesses are completely eliminated, the number and complexity of the wiring harnesses are greatly reduced, and the overall weight and cost of the system are reduced. Since the acquisition board and a large number of wiring harnesses outside the module are cancelled, the internal space of the power battery pack is more effectively utilized, so that more battery cells can be accommodated or a more compact design can be adopted, which directly improves the energy density of the battery system.

[0006] The technical solution adopted by the present invention to solve its technical problems is: the battery pack adopting a distributed acquisition large module solution described in the present invention includes a lower shell and a liquid cooling plate embedded in the inner bottom wall of the lower shell; the side wall of the lower shell is installed with an electrical plug-in and a BDU; the electrical plug-in is connected to the vehicle interface; one end of the liquid cooling plate is connected to a liquid cooling pipe assembly that passes through the lower shell; the upper end surface of the liquid cooling plate is connected to the battery module through a heat-conducting material; the battery module is connected to the lower shell by bolts; an upper shell is covered above the battery module; a communication harness, a BMS and a high-voltage busbar are arranged between the battery module and the upper shell; the communication harness transmits the voltage and temperature information inside the battery module to the BMS in the form of digital signals; the high-voltage busbar connects the battery module, BDU and the electrical plug-in into a high-voltage circuit.

[0007] Preferably, the battery module includes a module body and a module top cover; a CCS assembly is arranged between the module body and the module top cover; the CCS assembly includes a bottom insulating film; a high-voltage connection unit is installed on the upper end of the bottom insulating film; two FPC assemblies are connected to the upper end of the high-voltage connection unit; a covering film is installed on the upper end of the FPC assembly; an acquisition module is installed on the upper end of the FPC assembly; the acquisition module is used for acquisition signal processing and communication; a thermally conductive insulating sheet is installed on the upper end of the acquisition module; a heat protection insulating sheet is arranged between the two FPC assemblies and the high-voltage connection unit.

[0008] Preferably, the liquid cooling plate includes a heat conducting plate and a serpentine flow channel shell; the flow channel shell is embedded in the heat conducting plate up and down; the lower end of the flow channel shell is open, and the inner side is slidingly sealed and connected to the flow channel plate; the upper end surface of the flow channel plate and the inner wall of the flow channel shell are combined to form a cooling flow channel with variable space; the lower surface of the flow channel plate is connected to the gravity plate through a connecting plate; the upper surface of the gravity plate and the lower surface of the liquid cooling plate are connected by a tension spring; a liquid inlet hole and a liquid outlet hole are provided at the edge of the upper surface of the heat conducting plate; the liquid inlet hole and the liquid outlet hole are respectively connected to the ends of the cooling flow channel; the end of the liquid inlet hole and the liquid outlet hole away from the cooling flow channel is connected to the liquid cooling pipe assembly.

[0009] Preferably, first one-way valves with opposite directions are arranged in the liquid inlet and the liquid outlet.

[0010] Preferably, the lower surface of the heat conducting plate is fixedly connected to a square sleeve; the flow channel shell is located on the inner side of the square sleeve; the lower end of the square sleeve is turned inward to form a curved edge; the inner cross-section of the square sleeve is the same as the cross-section of the gravity plate; the inner wall of the square sleeve is slidingly and sealingly connected to the outer edge of the gravity plate; the side wall of the square sleeve is penetrated by an air hole; the air hole is not lower than the lower end of the flow channel shell in the vertical direction.

[0011] Preferably, there are two air holes, which are arranged far away from each other; and second one-way valves with opposite directions are arranged in the two air holes.

[0012] Preferably, the air holes are arranged in the left and right directions of the square sleeve; the front and rear inner walls of the square sleeve are arranged in contact with the flow channel shell; the connecting plate is penetrated by fin grooves in the left and right directions; the setting direction of the fin grooves is consistent with the direction of the line connecting the two air holes.

[0013] Preferably, the cross section of the connecting plate is consistent with the cross section of the flow channel plate; the length of the fin groove is consistent with the length of the connecting plate in the left-right direction.

[0014] Preferably, an embedding groove is provided on the upper surface of the flow channel plate; the length direction of the embedding groove is consistent with the flow direction of the coolant in the cooling flow channel; an elastic sheet is fixedly connected to the embedding groove; the elastic sheet is inclined, and the upper end is in contact with the top wall of the flow channel shell; the elastic sheet has elastic force, and the elastic force is smaller than the tension of the tension spring.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention integrates the voltage, temperature acquisition and processing function modules into the CCS assembly, thereby greatly simplifying the wiring harness outside the module and comprehensively improving the system performance. By directly integrating the acquisition and processing functions into the CCS assembly, these cumbersome external wiring harnesses are completely eliminated, the number and complexity of the wiring harnesses are greatly reduced, and the overall weight and cost of the system are reduced. Since the acquisition board and a large number of wiring harnesses outside the module are eliminated, the internal space of the power battery pack is more effectively utilized, so that more battery cells can be accommodated or a more compact design can be adopted, which directly improves the energy density of the battery system.

[0017] 2. In the present invention, since the volume in the cooling channel is changing, impurities such as precipitation generated in the cooling channel over a long period of time are loosened, and it is difficult for impurities to adhere in the cooling channel with a changing volume. The impurities will be discharged along the liquid outlet along with the coolant, thereby ensuring the cleanliness and smoothness of the cooling channel, and then ensuring the smooth circulation of the coolant in the cooling channel, thereby improving the cooling effect of the liquid cooling plate on the battery module.

[0018] 3. In the present invention, the positions of the two air holes are far away from each other, one of which is responsible for air intake and the other is responsible for air exhaust, so that the gas inside the battery pack can circulate into the square sleeve to be cooled, thereby cooling the gas around the battery module and realizing air cooling of the internal circulation inside the battery pack, and cooperating with the liquid cooling of the battery module by the coolant, the heat dissipation efficiency of the battery pack is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 is a three-dimensional diagram of a battery pack of the present invention;

[0021] Figure 2 is a three-dimensional diagram of a battery module in the present invention;

[0022] Figure 3 is a circuit diagram of a battery pack of the present invention;

[0023] Figure 4 is a three-dimensional diagram of the liquid cooling plate of the present invention;

[0024] Figure 5 yes Figure 4 A three-dimensional image from another angle;

[0025] Figure 6 is a schematic diagram of the opening direction of the flow channel shell in the present invention;

[0026] Figure 7 is a position diagram of the elastic sheet in the present invention;

[0027] Figure 8 is a position diagram of the fin slots in the present invention;

[0028] Fig. 9 yes Figure 8 The enlarged view of point A in the middle;

[0029] Fig.10 It is a cross-sectional view of the liquid cooling plate in the present invention.

[0030] In the figure: lower shell 1, electrical plug-in 11, BDU12, liquid cooling plate 2, liquid cooling pipe assembly 21, heat conducting plate 22, liquid inlet hole 221, liquid outlet hole 222, flow channel shell 23, flow channel plate 24, embedding groove 241, elastic sheet 242, cooling flow channel 25, connecting plate 26, fin groove 261, gravity plate 27, tension spring 271, square sleeve 28, air hole 281, battery module 3, thermal conductive material 31, module body 32, module top cover 33, CCS assembly 34, bottom insulating film 341, high voltage connection unit 342, FPC assembly 343, covering film 344, acquisition module 345, thermal conductive insulating sheet 346, thermal protection insulating sheet 347, upper shell 4, communication harness 41, BMS42, high voltage busbar 43. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0032] like Figures 1 to 10 As shown, the present invention includes the following embodiments:

[0033] Embodiment 1: A battery pack adopting a distributed acquisition large module solution comprises a lower shell 1 and a liquid cooling plate 2 embedded in the inner bottom wall of the lower shell 1; an electrical plug-in 11 and a BDU 12 are installed on the side wall of the lower shell 1; the electrical plug-in 11 is connected to the vehicle interface; one end of the liquid cooling plate 2 is connected to a liquid cooling pipe assembly 21 that passes through the lower shell 1; the upper end surface of the liquid cooling plate 2 is connected to a battery module 3 through a heat conductive material 31; the battery module 3 is connected to the lower shell 1 by bolts; an upper shell 4 is covered above the battery module 3; a communication harness 41, a BMS 42 and a high-voltage busbar 43 are arranged between the battery module 3 and the upper shell 4; the communication harness 41 transmits the voltage and temperature information inside the battery module 3 to the BMS 42 in the form of digital signals; the high-voltage busbar 43 connects the battery module 3, the BDU 12 and the electrical plug-in 11 into a high-voltage circuit.

[0034] In this embodiment, the battery module 3 includes a module body 32 and a module top cover 33; a CCS assembly 34 is arranged between the module body 32 and the module top cover 33; the CCS assembly 34 includes a bottom insulating film 341; a high-voltage connection unit 342 is installed on the upper end of the bottom insulating film 341; two FPC assemblies 343 are connected to the upper end of the high-voltage connection unit 342; a covering film 344 is installed on the upper end of the FPC assembly 343; a collection module 345 is installed on the upper end of the FPC assembly 343; the collection module 345 is used for collection signal processing and communication; a heat-conducting insulating sheet 346 is installed on the upper end of the collection module 345; a heat-protective insulating sheet 347 is arranged between the two FPC assemblies 343 and the high-voltage connection unit 342.

[0035] During operation, the liquid cooling plate 2 is attached to the battery module 3 through the heat conductive material 31, providing thermal management function for the battery module 3; the CCS assembly 34 is a battery unit connection system; the acquisition module 345 on the two FPC assemblies 343 is used to collect the voltage and temperature in the battery module 3, and then convert the collected voltage and temperature data into digital signals, and the communication harness 41 transmits the voltage and temperature information to the BMS 42 in the form of digital signals, and finally transmits it out by the electrical plug-in 11; the bottom insulating film 341 is used to provide necessary insulation protection, mechanical strength and durability Reliability; the high-voltage connection unit 342 is the main channel for current transmission, through which the loop connection of the battery cell is realized; the thermal conductive insulating sheet 346 is attached to the acquisition module 345 to play the role of insulation, heat conduction and heat dissipation. The thermal protection insulating sheet 347 is located at the bottom of the acquisition module 345, forming thermal protection isolation and insulation protection isolation between the exhaust channel of the battery cell; due to the cancellation of the external acquisition harness of the battery module 3: in the traditional battery system, each module or battery cell requires a separate voltage and temperature sensor harness to be connected to the external BMS42 acquisition board; in the simplified system, only the A small number of wiring harnesses are used for communication between modules and between modules and BMS42. These wiring harnesses are responsible for transmitting processed data and control signals, further improving the reliability and response speed of the system. The reduction of wiring harnesses and acquisition boards directly reduces the weight of the battery system, which is crucial for improving the range and energy efficiency of electric vehicles. The acquisition and processing function module integrated in CCS can monitor the voltage and temperature of each battery cell in real time and accurately, and perform preliminary processing through built-in algorithms, which improves the accuracy and reliability of data and reduces the burden on BMS42. By adopting advanced materials and optimized design, CCS itself can also be lightweight, further reducing the weight of the entire battery system. The integrated design makes the monitoring of voltage and temperature more timely and accurate, which helps to timely discover and deal with potential safety hazards such as overheating and overvoltage, and improves the overall safety of the battery system. Due to the reduction of external wiring harnesses and acquisition boards, the maintenance and troubleshooting of battery packs become simpler and faster, reducing maintenance costs and downtime. The design is easy to adapt to battery packs of different sizes and types, providing convenience for future technology upgrades and expansions.

[0036] The present invention integrates the voltage, temperature acquisition and processing functional modules into the CCS assembly 34, thereby achieving a substantial simplification of the wiring harness outside the module and a comprehensive improvement in the system performance. By directly integrating the acquisition and processing functions into the CCS assembly 34, these cumbersome external wiring harnesses are completely eliminated, the number and complexity of the wiring harnesses are greatly reduced, and the overall weight and cost of the system are reduced. Since the acquisition board and a large number of wiring harnesses outside the module are eliminated, the internal space of the power battery pack is more effectively utilized, thereby accommodating more battery cells or adopting a more compact design, which directly improves the energy density of the battery system.

[0037] Embodiment 2: The liquid cooling plate 2 comprises a heat conducting plate 22 and a serpentine flow channel shell 23; the flow channel shell 23 is embedded in the heat conducting plate 22 from top to bottom; the lower end of the flow channel shell 23 is open, and the inner side is slidingly and sealingly connected to the flow channel plate 24; the upper end surface of the flow channel plate 24 is combined with the inner wall of the flow channel shell 23 to form a cooling flow channel 25 with variable space; the lower surface of the flow channel plate 24 is connected to the gravity plate 27 through a connecting plate 26; the upper surface of the gravity plate 27 is connected to the lower surface of the liquid cooling plate 2 by a tension spring 271; a liquid inlet hole 221 and a liquid outlet hole 222 are provided at the edge of the upper surface of the heat conducting plate 22; the liquid inlet hole 221 and the liquid outlet hole 222 are respectively connected to the ends of the cooling flow channel 25; the end of the liquid inlet hole 221 and the liquid outlet hole 222 away from the cooling flow channel 25 is connected to the liquid cooling pipe assembly 21.

[0038] In this embodiment, first one-way valves with opposite directions are disposed in the liquid inlet hole 221 and the liquid outlet hole 222 .

[0039] After the liquid cooling plate 2 is connected to the liquid cooling tube assembly 21, it is assembled inside the battery pack. During use, the battery module 3 in the battery pack will work and release heat. The battery module 3 will transfer the heat to the heat conducting plate 22 in the liquid cooling plate 2 through the heat conducting material 31. The coolant will enter the liquid inlet hole 221 along the liquid cooling tube assembly 21. The coolant in the liquid inlet hole 221 will enter the cooling channel 25. The coolant will contact and exchange heat with the parts around the cooling channel 25, thereby absorbing and taking away the heat. The coolant will be discharged along the liquid outlet hole 222. The battery pack is used in a vehicle. The vehicle will vibrate during driving, and the vibration will be transmitted to the gravity plate 27. The gravity plate 27 will move downward under the vibration. During the downward movement of the gravity plate 27 The tension spring 271 will be pulled, and the connection plate 26 and the flow channel plate 24 will be driven downward during the downward movement of the gravity plate 27. As the vibration of the vehicle changes, the tension spring 271 will pull the gravity plate 27 upward, and the connection plate 26 and the flow channel plate 24 will be driven during the upward movement of the gravity plate 27. Therefore, during the operation of the vehicle, the gravity plate 27 will passively move up and down. The up and down movement of the gravity plate 27 can also be actively carried out, that is, the upper surface of the gravity plate 27 is contacted with an eccentric wheel (not shown in the figure), and the eccentric wheel is fixedly connected to the output shaft of the motor (not shown in the figure). The rotation of the motor output shaft will drive the eccentric wheel to intermittently squeeze the gravity plate 27 downward, and cooperate with the pulling of the tension spring 271 to make the gravity plate 27 actively move up and down;

[0040] The gravity plate 27 will drive the flow channel plate 24 to move up and down in the flow channel shell 23 during the up and down movement. During the downward movement of the flow channel plate 24, the space in the cooling flow channel 25 will be enlarged to form a negative pressure. The coolant will enter the cooling flow channel 25 along the liquid inlet hole 221 under the action of the negative pressure. Of course, the coolant can also actively enter the cooling flow channel 25 along the liquid inlet hole 221. Under the negative pressure, the coolant can enter the cooling flow channel 25 more smoothly and quickly. After the coolant has finished absorbing heat, the gravity plate 27 will move up and the cooling flow channel As the space inside 25 becomes smaller, the coolant in the cooling channel 25 will be pressurized and discharged along the liquid outlet 222. Since the volume inside the cooling channel 25 is changing, the impurities such as precipitation generated in the cooling channel 25 for a long time are loosened, and it is difficult for the impurities to adhere to the cooling channel 25 with a changing volume. The impurities will be discharged along the liquid outlet 222 along with the coolant, ensuring the cleanliness and smoothness of the cooling channel 25, thereby ensuring the smooth circulation of the coolant in the cooling channel 25, thereby improving the cooling effect of the liquid cooling plate 2 on the battery module.

[0041] Embodiment 3: The lower surface of the heat conducting plate 22 is fixedly connected to the square sleeve 28; the flow channel shell 23 is located on the inner side of the square sleeve 28; the lower end of the square sleeve 28 is turned inward to form a curved edge; the inner cross-section of the square sleeve 28 is the same as the cross-section of the gravity plate 27; the inner wall of the square sleeve 28 is slidingly and sealingly connected to the outer edge of the gravity plate 27; the side wall of the square sleeve 28 is penetrated by an air hole 281; the air hole 281 is not lower than the lower end of the flow channel shell 23 in the vertical direction.

[0042] In this embodiment, there are two air holes 281 , which are arranged far away from each other; second one-way valves with opposite directions are arranged in the two air holes 281 .

[0043] During the downward movement of the gravity plate 27, the space inside the square sleeve 28 will become larger to form a negative pressure. The gas in the battery pack will enter the square sleeve 28 along one of the air holes 281, and the gas will contact the flow channel shell 23 and the connecting plate 26. The gas will transfer its own heat to the flow channel shell 23 and the connecting plate 26. The flow channel shell 23 and the connecting plate 26 will transfer the heat to the coolant in the cooling channel 25 to achieve heat transfer. As the gravity plate 27 moves upward, the gravity plate 27 will squeeze the gas inside the square sleeve 28, so that the cooled gas in the square sleeve 28 will be discharged along another air hole 281. The positions of the two air holes 281 are far away from each other, one of the air holes 281 is responsible for air intake, and the other air hole 281 is responsible for air outlet. In this way, the gas inside the battery pack can circulate into the square sleeve 28 to be cooled, thereby cooling the gas around the battery module and realizing air cooling of the internal circulation inside the battery pack, and cooperating with the liquid cooling of the battery module by the coolant, the heat dissipation efficiency of the battery pack is greatly improved.

[0044] Embodiment 4: The air holes 281 are arranged in the left and right directions of the square sleeve 28; the front and rear inner walls of the square sleeve 28 are arranged in contact with the flow channel shell 23; the connecting plate 26 is penetrated by fin grooves 261 in the left and right directions; the setting direction of the fin grooves 261 is consistent with the direction of the line connecting the two air holes 281.

[0045] In this embodiment, the cross section of the connecting plate 26 is consistent with the cross section of the flow channel plate 24 ; the length of the fin slot 261 is consistent with the length of the connecting plate 26 in the left-right direction.

[0046] After the gas inside the battery pack enters the square sleeve 28 along the air hole 281 on the left side, since the front and rear inner walls of the square sleeve 28 are in contact with the front and rear positions of the outer wall of the flow channel shell 23, the space at the left and right ends of the square sleeve 28 needs to pass through the fin groove 261 to achieve circulation. In this way, during the up and down circulation of the gravity plate 27, the gas inside the square sleeve 28 will pass through the fin groove 261 from left to right. The setting of the fin groove 261 increases the contact area between the connecting plate 26 and the gas, so that the heat carried by the gas inside the battery pack is better absorbed by the fin groove 261, so that the gas passing through the square sleeve 28 can transfer more heat to the connecting plate 26, and the heat of the connecting plate 26 will be transferred to the coolant through the flow channel plate 24, thereby making the temperature of the gas passing through the square sleeve 28 lower, so that the heat dissipation effect of the battery pack is further improved; in this embodiment, by setting the length of the fin groove 261, the flow path of the airflow in the fin groove 261 is extended, thereby improving the heat exchange effect between the heat of the airflow and the connecting plate 26.

[0047] Embodiment 5: An embedding groove 241 is provided on the upper surface of the flow channel plate 24; the length direction of the embedding groove 241 is consistent with the flow direction of the coolant in the cooling flow channel 25; an elastic sheet 242 is fixedly connected to the embedding groove 241; the elastic sheet 242 is inclined, and the upper end is in contact with the inner top wall of the flow channel shell 23; the elastic sheet 242 has elastic force, and the elastic force is less than the tension of the tension spring 271.

[0048] During the up-and-down movement of the flow channel plate 24 in the flow channel shell 23, the flow channel plate 24 will drive the embedding groove 241 on the upper surface to move up and down, and during the up-and-down movement of the flow channel plate 24, the lower end of the elastic sheet 242 will be driven to move up and down. The upper end of the elastic sheet 242 always presses against the inner top wall of the flow channel shell 23 under the action of its own elastic force. Therefore, during the up-and-down movement, the lower end of the elastic sheet 242 will drive the upper end to scrape against the inner top wall of the flow channel shell 23, so that the impurities on the inner bottom wall of the flow channel shell 23 are scraped and loosened. , preventing impurities on the inner bottom wall of the flow channel shell 23 from being moved up and pressed by the flow channel plate 24, further preventing impurities from remaining in the cooling flow channel 25. After the impurities flow out along the liquid outlet 222, they will be filtered by the filter component and then returned to the cooling flow channel 25 for use; the impurities in the cooling flow channel 25 of the present invention are not cleaned centrally, so the impurities can flow away with the flow of the coolant, and will not cause blockage of the liquid inlet hole 221 and the liquid outlet hole 222. In addition, the aperture of the liquid inlet hole 221 and the liquid outlet hole 222 can be expanded to avoid blockage.

[0049] Embodiment 6: The reasons why the coolant flows in the cooling channel 25 for a long time are as follows: first, the coolant itself is impure and contains impurities; second, the wear of the internal materials of the liquid cooling plate produces debris; third, the battery pack is not well sealed, and external dust enters; fourth, the coolant and the liquid cooling plate material undergo a chemical reaction; fifth, the coolant decomposes itself at high temperatures; sixth, the overheating of the battery causes the internal material to decompose; therefore, the coolant in the cooling channel will form impurities and eventually cause blockage when it circulates for a long time, and the present invention solves this problem and has broad market application prospects.

[0050] Embodiment 7: A solid desiccant is installed in the fin slot 261 to dry the moisture generated in the battery pack.

[0051] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 4 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pack adopting a distributed collection large module solution, comprising a lower shell and a liquid cooling plate embedded in the bottom wall of the lower shell; characterized in that: The side wall of the lower shell is installed with an electrical plug-in and a BDU; the electrical plug-in is connected to the vehicle interface; one end of the liquid cooling plate is connected to the liquid cooling pipe assembly that passes through the lower shell; the upper end surface of the liquid cooling plate is connected to the battery module through a heat-conducting material; the battery module is connected to the lower shell by bolts; an upper shell is covered above the battery module; a communication harness, a BMS and a high-voltage busbar are arranged between the battery module and the upper shell; the communication harness transmits the voltage and temperature information inside the battery module to the BMS in the form of digital signals; the high-voltage busbar connects the battery module, BDU and the electrical plug-in into a high-voltage circuit.

2. A battery pack adopting a distributed data acquisition large module solution according to claim 1, characterized in that: The battery module includes a module body and a module top cover; a CCS assembly is arranged between the module body and the module top cover; the CCS assembly includes a bottom insulating film; a high-voltage connection unit is installed on the upper end of the bottom insulating film; two FPC assemblies are connected to the upper end of the high-voltage connection unit; a covering film is installed on the upper end of the FPC assembly; an acquisition module is installed on the upper end of the FPC assembly; the acquisition module is used for acquisition signal processing and communication; a heat-conducting insulating sheet is installed on the upper end of the acquisition module; a heat-protection insulating sheet is arranged between the two FPC assemblies and the high-voltage connection unit.

3. A battery pack adopting a distributed data acquisition large module solution according to claim 1, characterized in that: The liquid cooling plate includes a heat conducting plate and a serpentine flow channel shell; the flow channel shell is embedded in the heat conducting plate from top to bottom; the lower end of the flow channel shell is open, and the inner side is slidingly sealed and connected to the flow channel plate; the upper end surface of the flow channel plate and the inner wall of the flow channel shell are combined to form a cooling flow channel with variable space; the lower surface of the flow channel plate is connected to the gravity plate through a connecting plate; the upper surface of the gravity plate and the lower surface of the liquid cooling plate are connected by a tension spring; a liquid inlet hole and a liquid outlet hole are provided at the edge of the upper surface of the heat conducting plate; the liquid inlet hole and the liquid outlet hole are respectively connected to the ends of the cooling flow channel; the end of the liquid inlet hole and the liquid outlet hole away from the cooling flow channel is connected to the liquid cooling pipe assembly.

4. A battery pack adopting a distributed data acquisition large module solution according to claim 3, characterized in that: The liquid inlet and the liquid outlet are provided with first one-way valves with opposite directions.

5. The battery pack adopting the distributed data acquisition large module solution according to claim 3, characterized in that: The lower surface of the heat conducting plate is fixedly connected to the square sleeve; the flow channel shell is located on the inner side of the square sleeve; the lower end of the square sleeve is turned inward to form a curved edge; the inner cross-section of the square sleeve is the same as the cross-section of the gravity plate; the inner wall of the square sleeve is slidingly and sealingly connected to the outer edge of the gravity plate; the side wall of the square sleeve is penetrated by an air hole; the air hole is not lower than the lower end of the flow channel shell in the vertical direction.

6. A battery pack adopting a distributed data acquisition large module solution according to claim 5, characterized in that: There are two air holes, which are arranged far away from each other; second one-way valves with opposite directions are arranged in the two air holes.

7. A battery pack adopting a distributed data acquisition large module solution according to claim 6, characterized in that: The air holes are arranged in the left and right directions of the square sleeve; the front and rear inner walls of the square sleeve are arranged in contact with the flow channel shell; the connecting plate is penetrated by fin grooves in the left and right directions; the setting direction of the fin grooves is consistent with the direction of the line connecting the two air holes.

8. A battery pack adopting a distributed data acquisition large module solution according to claim 7, characterized in that: The cross section of the connecting plate is consistent with the cross section of the flow channel plate; the length of the fin slot is consistent with the length of the connecting plate in the left-right direction.

9. The battery pack adopting the distributed data acquisition large module solution according to claim 3, characterized in that: An embedding groove is provided on the upper surface of the flow channel plate; the length direction of the embedding groove is consistent with the flow direction of the coolant in the cooling flow channel; an elastic sheet is fixedly connected to the embedding groove; the elastic sheet is inclined, and the upper end is in contact with the top wall of the flow channel shell; the elastic sheet has elastic force, and the elastic force is smaller than the tension of the tension spring.

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