Large cylindrical battery cell module with integrated thermal management system

Abstract

This invention belongs to the field of power battery system integration design technology, specifically a large cylindrical cell module with an integrated thermal management system. It includes a corrugated liquid cooling pipe and large cylindrical cells. The corrugated liquid cooling pipe is coated with a pressure-resistant insulating layer. The large cylindrical cells are bonded to the surface of the corrugated liquid cooling pipe using a paste-like thermally conductive adhesive to form chains, and these chains are stacked to form a cell group. An aluminum bar is installed on the cell group, and a signal acquisition and processing FPC is installed on the top of the cell group. A voltage and temperature data sampling module is also installed on the cell group. This invention lays the large cylindrical cells flat and adhesives them onto the corrugated liquid cooling pipe, then stacks and adhesives them onto an engineering plastic base to form a cell module. This eliminates the need for fasteners, improving the automation level of cell module production, increasing battery pack production efficiency, and achieving thermal offset circulation in the corrugated liquid cooling pipe through a current collector, reducing the temperature difference between cells in the cell module and improving thermal management performance.

Description

Technical Field

[0001] This invention belongs to the field of power battery system integration design technology, specifically a large cylindrical cell module with an integrated thermal management system. Background Technology

[0002] With the emergence of global environmental degradation and resource depletion, major automakers have turned their attention to new energy vehicles, resulting in a proliferation of various electric vehicles such as hybrid vehicles, pure electric vehicles, and range-extended electric vehicles.

[0003] In new energy electric vehicles, the power battery system is a key component. With the increasing demand for power battery systems and the gradual improvement of requirements for battery pack production efficiency and consistency, the integrated design of various components of the power battery system is imperative.

[0004] Currently, the integration solutions for power battery systems mainly adopt two approaches: module-based solutions and module-less CTP (cell-to-pack) solutions. For existing large cylindrical cells in passenger vehicle systems, most systems use a cubic arrangement of shorter cells, and there is no good assembly solution for long cylindrical cells.

[0005] To address the challenges of assembling large cylindrical cells horizontally, and to solve the problems of module thermal management, voltage and temperature data sampling, and module-pack enclosure heat insulation, a large cylindrical cell module with an integrated thermal management system is designed. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes a large cylindrical cell module with an integrated thermal management system. The large cylindrical cells are laid flat and glued onto a corrugated liquid cooling pipe, then stacked and glued onto an engineering plastic base to form a cell module. This eliminates the need for fasteners, increasing the automation level of cell module production and improving battery pack production efficiency. Furthermore, the invention utilizes a current collector to achieve hot and cold counter-current circulation within the corrugated liquid cooling pipe, reducing the temperature difference between cells in the cell module and improving thermal management performance.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The large cylindrical battery cell module of the integrated thermal management system of the present invention includes a corrugated liquid cooling tube and a large cylindrical battery cell. The outer surface of the corrugated liquid cooling tube is sprayed with a pressure-resistant insulating layer, and the surface of the corrugated liquid cooling tube is coated with a paste-like thermally conductive structural adhesive. The large cylindrical battery cell is pressed on the surface of the corrugated liquid cooling tube to form a chain. The chains are stacked together with each other through the thermally conductive structural adhesive to form a group of battery cells. The group of battery cells is arranged flat in the battery pack PCK box.

[0008] Busbars are installed on both sides of the battery cell assembly, a signal acquisition and processing FPC is installed on the top of the battery cell assembly, and a voltage and temperature data sampling module is installed at the end of the battery cell assembly. The voltage and temperature data sampling module is interconnected with the signal acquisition and processing FPC.

[0009] Preferably, it also includes an engineering plastic base, the upper surface of which is a corrugated surface, and a clearance groove is formed on the corrugated surface;

[0010] Large cylindrical battery cells are installed on the front side of the corrugated liquid cooling tube to form a single chain, and large cylindrical battery cells are installed on both the front and back sides of the corrugated liquid cooling tube to form a double chain.

[0011] The single chain is fixedly installed on the corrugated surface by structural adhesive. The corrugated liquid cooling pipe in the single chain is pressed into the clearance groove. The double chains are stacked on the single chain to form a cell module. A heat-equalizing aluminum plate is installed between the double chains and the single chain. The front and back surfaces of the heat-equalizing aluminum plate are coated with a paste-like thermally conductive structural adhesive.

[0012] In the battery cell module, two adjacent layers of battery cells are arranged in a triangular staggered manner.

[0013] Preferably, the corrugated liquid cooling pipe is a dual-pipe design, with a manifold installed on one side of the corrugated liquid cooling pipe, through which the corrugated liquid cooling pipe forms a return flow.

[0014] Preferably, the surface of the uniform temperature aluminum plate is provided with a connecting groove, and the portion of the connecting groove is filled with structural adhesive.

[0015] Preferably, the projections of the uniform temperature aluminum plate and the engineering plastic base on the horizontal plane coincide, and the projection of the corrugated liquid cooling pipe on the horizontal plane is located inside the projection of the uniform temperature aluminum plate on the horizontal plane.

[0016] The heat-equalizing aluminum plate includes at least three connecting slots located at both ends and the middle in the width direction. The connecting slot in the middle of the heat-equalizing aluminum plate is located between the two tubes on the corrugated liquid cooling pipe. Plastic sheets are bonded to the connecting slots at both ends of the heat-equalizing aluminum plate in the width direction. The cross-section of the plastic sheets is arc-shaped towards the direction of the large cylindrical battery cell.

[0017] Preferably, the engineering plastic base has cavities inside, the cavities are staggered with each other, and the bottom surface of the engineering plastic base has evenly distributed protrusions.

[0018] Preferably, the cavity has a hexagonal cross-section, and a heat insulation plate is inserted into the cavity. The heat insulation plate is made of aerogel.

[0019] Preferably, the current collector and the surface of the voltage and temperature data sampling module are interconnected, and a positioning groove is provided on the surface of the voltage and temperature data sampling module, into which the current collector is inserted.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The large cylindrical battery cell module of the integrated thermal management system described in this invention can arbitrarily adjust the number of stacked layers of the large cylindrical battery cells according to the differences in vehicle envelope, thereby adapting to various envelopes and improving versatility. At the same time, the entire battery cell module does not use any fastening standard parts, and the battery cell module can achieve fully automated production, reducing module materials by more than 20%. In addition, the bottom of the battery cell module adopts an engineering plastic base to effectively fix the large cylindrical battery cells and the module. The engineering plastic base can also be structurally glued to the PACK lower housing, thereby improving PACK production efficiency and improving the overall structural strength and rigidity of the PACK. Furthermore, the integrated structure requirements of the battery cell module are met by using a corrugated liquid cooling pipe with a pressure-resistant insulating coating sprayed on the surface, thereby reducing the weight of the battery cell module.

[0022] 2. The large cylindrical battery cell module with integrated thermal management system described in this invention integrates a signal acquisition and processing FPC on the upper part of the battery cell module, which strengthens the overall integrity of the battery cell module. Therefore, it is not necessary to reinstall the acquisition line inside the module during battery pack production, which improves production efficiency and consistency. At the same time, the positive and negative terminals of the battery cell module are connected by aluminum bars for current passing. The positive and negative terminals are welded to the positive and negative terminals of the large cylindrical battery cell by laser, so that the material on the line is only an integrated aluminum bar. Moreover, the material is automatically fed and automatically welded, which can improve production efficiency, reduce material and manufacturing costs, and realize fully automated production.

[0023] 3. The large cylindrical cell module of the integrated thermal management system described in this invention features a double-pipe design for the corrugated liquid cooling pipe. A return flow is formed through a collector on one side, creating a hot and cold liquid counter-current circulation. This counter-current circulation effectively reduces the temperature difference between the large cylindrical cells within the entire cell module. Simultaneously, the cell module is glued to the battery pack housing at the bottom. The bottom of the cell module is an engineering plastic base, which effectively isolates heat conduction between the battery pack housing and the cell module, ensuring that the cell module is unaffected by external temperatures. This maximizes the thermal management performance of the cell module and improves the temperature consistency of the large cylindrical cells. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the battery cell module of the present invention in two directions: the front (top) and the back (bottom).

[0026] Figure 2This is an exploded view of the battery cell module of the present invention;

[0027] Figure 3 This is a schematic diagram showing the positions of the engineering plastic base, the corrugated liquid cooling pipe, and the heat-dissipating aluminum plate in the battery cell module of this invention.

[0028] Figure 4 This is a schematic diagram of the corrugated liquid cooling pipe in the battery cell module of the present invention;

[0029] Figure 5 This is a schematic diagram of the thermal counterbalancing effect of the corrugated liquid cooling pipe on the battery cell in the battery cell module of the present invention; wherein, the arrow indicates the flow direction;

[0030] Figure 6 This is a schematic diagram of the temperature-equalizing aluminum plate in the battery cell module of the present invention;

[0031] Figure 7 This is a schematic diagram of the engineering plastic base in the battery cell module of the present invention;

[0032] In the diagram: 1. Large cylindrical battery cell; 2. Engineering plastic base; 3. Alternating groove; 4. Cavity; 5. Corrugated liquid cooling pipe; 6. Current collector; 7. Aluminum heat spreader plate; 8. Connecting hole groove; 9. Aluminum bar; 10. Signal acquisition and processing FPC; 11. Voltage and temperature data sampling module. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0034] like Figures 1 to 7 As shown, the large cylindrical battery cell module of the integrated thermal management system of the present invention includes a corrugated liquid cooling pipe 3 and a large cylindrical battery cell 1. The outer surface of the corrugated liquid cooling pipe 3 is sprayed with a pressure-resistant insulating layer, and the surface of the corrugated liquid cooling pipe 3 is coated with a paste-like thermally conductive structural adhesive. The large cylindrical battery cell 1 is pressed onto the surface of the corrugated liquid cooling pipe 3 to form a chain. The chains are stacked together with each other through the thermally conductive structural adhesive to form a group of battery cells. The group of battery cells is laid flat in the battery pack PCK box.

[0035] Busbars 6 are installed on both sides of the battery cell group, signal acquisition and processing FPC7 is installed on the top of the battery cell group, and voltage and temperature data sampling modules 8 are installed at the ends of the battery cell group. The voltage and temperature data sampling modules 8 are interconnected with the signal acquisition and processing FPC7.

[0036] Large cylindrical cells 1 are fixedly mounted onto corrugated liquid cooling pipes 3 using a paste-like thermally conductive structural adhesive. This allows multiple individual large cylindrical cells 1 to be combined with the corrugated liquid cooling pipes 3 to form a chain. The full contact between the corrugated liquid cooling pipes 3 and the large cylindrical cells 1 dissipates and evens out the heat of the large cylindrical cells 1 in the chain, improving the temperature consistency among the individual large cylindrical cells 1. This facilitates thermal management of the battery pack. Furthermore, by using the corrugated liquid cooling pipes 3 as a structural component to integrate with the large cylindrical cells 1, the morphological stability of the assembled large cylindrical cells 1 is maintained, fulfilling the integrated structure requirements of the battery pack and reducing the use of other structural components, thereby further reducing the weight of the battery pack.

[0037] Meanwhile, the installation of signal acquisition and processing PFC on the top of the battery cells and voltage and temperature data sampling module 8 at the end of the battery cells enhances the integrity of the battery cells and facilitates the acquisition and monitoring of data such as voltage and temperature of the battery cells. As a result, it is not necessary to install the acquisition line inside the module again in the subsequent battery pack PCK production process, which improves production efficiency and the consistency of the battery cells and ensures the quality of the battery pack PACK products.

[0038] Meanwhile, since the large cylindrical cells 1 are combined with the corrugated liquid cooling pipes 3 to form chains, and the chains are stacked to form a group of cells, no other structural fasteners are needed during the production of the group of cells. This enables fully automated production of the group of cells and reduces the amount of materials required in the production process. Similarly, the group of cells are fixedly installed into the battery pack box with structural adhesive without the need for fasteners, which also improves the production efficiency of the battery pack.

[0039] Meanwhile, since the battery cells are stacked together by chains, the number of layers of large cylindrical cells in the battery cells can be easily changed by adjusting the number of stacked chains. Therefore, the battery cells can arbitrarily adjust the number of stacked layers according to the differences in vehicle envelope, thereby adapting to various envelopes and greatly improving versatility.

[0040] Meanwhile, the positive and negative electrodes of the large cylindrical cell 1 in the battery pack are connected by aluminum bars 6 for current passing, and the aluminum bars 6 are laser welded to the positive and negative electrodes of the large cylindrical cell 1. This can effectively reduce the amount of material on the production line during the battery pack production process. In addition, the aluminum bars 6 have a relatively simple and regular shape. After automatic feeding on the production line, they can be automatically laser welded, which further improves the production efficiency of the production line, reduces material and manufacturing costs, and realizes fully automated production.

[0041] As one embodiment of the present invention, it also includes an engineering plastic base 2, the upper surface of which is a wavy surface, and a clearance groove 21 is formed on the wavy surface;

[0042] Large cylindrical battery cells 1 are installed on the front side of the corrugated liquid cooling tube 3 to form a single chain, and large cylindrical battery cells 1 are installed on both the front and back sides of the corrugated liquid cooling tube 3 to form a double chain.

[0043] The single chain is fixedly installed on the corrugated surface by structural adhesive. The corrugated liquid cooling pipe 3 in the single chain is pressed into the clearance groove 21. The double chains are stacked on the single chain to form a battery cell module. A heat-equalizing aluminum plate 4 is installed between the double chain and the single chain. The front and back surfaces of the heat-equalizing aluminum plate 4 are coated with a paste-like thermally conductive structural adhesive.

[0044] In the battery cell module, two adjacent layers of battery cells are arranged in a triangular staggered manner.

[0045] By installing an engineering plastic base 2 under the battery cells, the battery cells and the large cylindrical battery cells 1 are further reinforced and fixed by the engineering plastic base 2, thereby improving the structural strength and stability of the battery cell module. This avoids the large cylindrical battery cells 1 being positioned and fixed only by the corrugated liquid cooling pipe 3, which is prone to deformation, bending, displacement and other issues during subsequent handling and installation, affecting the normal use of the battery cells and causing damage to the corrugated liquid cooling pipe 3, as well as affecting the temperature consistency between the large cylindrical battery cells 1.

[0046] Meanwhile, the battery cell module is also installed and fixed in the production process using structural adhesive and paste-like thermally conductive structural adhesive, without the need for additional fasteners. This reduces the amount of materials used in the battery cell module production process, enabling fully automated production and improving production efficiency.

[0047] Meanwhile, since the engineering plastic base 2 is also glued to the bottom of the battery pack box with structural adhesive, it can improve the production efficiency of the battery pack and improve the structural strength and rigidity of the battery pack product, thus avoiding deformation of the battery pack product during use.

[0048] Meanwhile, since the cell modules are stacked and assembled entirely by a paste-like thermally conductive structural adhesive, and the cell modules are also bonded to the battery pack box using structural adhesive, and the base of the cell modules is an engineering plastic base 2, the poor thermal conductivity of the engineering plastic base 2 can be utilized to effectively isolate the heat conduction between the battery pack box and the cell modules, effectively ensuring that the cell modules are not affected by external temperature changes, improving the thermal management performance of the cell modules, and ensuring good temperature consistency of the large cylindrical cells 1 in the cell modules.

[0049] In one embodiment of the present invention, the corrugated liquid cooling pipe 3 is a dual-pipe design, and a manifold 31 is installed on one side of the corrugated liquid cooling pipe 3, through which the corrugated liquid cooling pipe 3 forms a return flow.

[0050] By designing a double-tube corrugated liquid cooling pipe 3 and installing a collector box 31 on one side of the corrugated liquid cooling pipe 3, a backflow is formed between the corrugated liquid cooling pipes 3, which in turn causes a counter-current circulation between the hot and cold liquids flowing in the corrugated liquid cooling pipe 3. This counter-current circulation reduces the temperature difference between different large cylindrical cells 1 in the entire cell module and improves the temperature consistency of the cell module.

[0051] In one embodiment of the present invention, a connecting groove 41 is formed on the surface of the uniform temperature aluminum plate 4, and the portion of the connecting groove 41 is filled with structural adhesive.

[0052] When single chains and double chains are stacked together to form a battery cell module, there will be contact and stacking between single chains and double chains, and between double chains and double chains. At this time, a heat-equalizing aluminum plate 4 will be installed between them, and a paste-like thermally conductive structural adhesive will be coated on its surface to connect and conduct heat between the large cylindrical battery cells 1. At the same time, the heat-equalizing aluminum plate 4 can further improve the structural strength and structural rigidity of the stacked battery cell module.

[0053] Meanwhile, since the heat-dissipating aluminum plate 4 and the large cylindrical battery cell 1 are connected by a paste-like thermally conductive structural adhesive, and the paste-like thermally conductive structural adhesives on both sides of the heat-dissipating aluminum plate 4 are independent of each other, the connection strength between the large cylindrical battery cells 1 on both sides of the heat-dissipating aluminum plate 4 is relatively low after stacking to form a battery cell module. This is especially true when the battery pack box is tall and the number of stacked layers of large cylindrical battery cells 1 is large, which will adversely affect the structural strength and rigidity of the battery cell module. Therefore, a connecting groove 41 is opened on the surface of the heat-dissipating aluminum plate 4. Then, when applying the paste-like thermally conductive structural adhesive, the connecting groove 41 is avoided. Finally, the paste-like thermally conductive structural adhesive is applied to the connecting groove 41. High-strength structural adhesive is applied to allow the large cylindrical cells 1 on both sides of the uniform temperature aluminum plate 4 to be interconnected after the cell module is assembled. This further improves the connection strength between the large cylindrical cells 1 while ensuring that the thermal conductivity and fixing effect of the paste-like thermally conductive structural adhesive on the large cylindrical cells 1 remains unchanged. This results in good structural strength and rigidity of the assembled cell module, preventing the connection strength of the large cylindrical cells 1 far from the bottom engineering plastic base 2 from being affected when there are too many stacked layers of large cylindrical cells 1, which could lead to the cell module splitting or separating and affecting the normal use of the cell module.

[0054] In one embodiment of the present invention, the projections of the uniform temperature aluminum plate 4 and the engineering plastic base 2 on the horizontal plane coincide with each other, and the projection of the corrugated liquid cooling pipe 3 on the horizontal plane is located inside the projection of the uniform temperature aluminum plate 4 on the horizontal plane.

[0055] The temperature-equalizing aluminum plate 4 includes at least three connecting slots 41 located at both ends and the middle in the width direction. The connecting slot 41 in the middle of the temperature-equalizing aluminum plate 4 is located between the two tubes on the corrugated liquid cooling pipe 3. Plastic sheets are bonded to the connecting slots 41 at both ends in the width direction of the temperature-equalizing aluminum plate 4. The cross-section of the plastic sheet is an arc shape facing the direction of the large cylindrical battery cell 1.

[0056] By opening connecting slots 41 in the middle and on both sides of the width direction of the uniform temperature aluminum plate 4, the middle and both ends of the large cylindrical battery cells 1 on both sides of the uniform temperature aluminum plate 4 can be connected, which further improves the connection strength between the large cylindrical battery cells 1 on the upper and lower sides of the uniform temperature aluminum plate 4. This makes the battery cell module more integrated in structure, improves the structural strength and rigidity of the battery cell module, and avoids structural instability of the battery cell module, especially the battery cell module with a large number of stacked layers, which affects the normal use of the battery cell module.

[0057] Meanwhile, by opening the connecting hole groove 41 and applying high-strength structural adhesive at the connecting hole, the structural strength of the battery cell module is improved, avoiding the direct use of high-strength structural adhesive to wrap the large cylindrical battery cell 1, thereby reducing the amount of high-strength structural adhesive used in the battery cell module, so as not to affect the heat dissipation inside the battery cell module and cause the weight of the battery cell module to increase.

[0058] Meanwhile, since the connecting slots 41 at both ends of the uniform temperature aluminum plate 4 are relatively exposed and have no contact with other structures, it is not easy to apply the high-strength structural adhesive sufficiently, and the high-strength structural adhesive is prone to spreading and flowing, which affects the production of the battery cell module. Therefore, plastic sheets are installed at the connecting slots 41 at both ends to guide and adhere the applied high-strength structural adhesive, so as to avoid the high-strength structural adhesive not being able to be applied and adhered, spreading and flowing, affecting the production of the battery cell module, and increasing the amount of high-strength structural adhesive used and increasing the weight of the battery cell module.

[0059] In one embodiment of the present invention, the engineering plastic base 2 has a cavity 22 inside, the cavities 22 are distributed alternately, and the bottom surface of the engineering plastic base 2 is provided with uniformly distributed protrusions.

[0060] The cavity 22 increases the thermal resistance of the engineering plastic base 2 to heat transfer, further isolating the heat conduction between the engineering plastic base 2 and the cell module, and between the engineering plastic base 2 and the battery pack box, preventing the cell module from being affected by external temperature changes, thereby ensuring the stability and consistency of the internal temperature of the cell module, facilitating the thermal management system to manage and control the internal temperature of the cell module, and ensuring the safety of the cell module.

[0061] Meanwhile, by setting protrusions on the bottom surface of the engineering plastic base 2, the connection between the engineering plastic base 2 and the battery pack box is made more secure, further improving the structural strength and stability of the cell module.

[0062] In one embodiment of the present invention, the cavity 22 has a hexagonal cross-section, and a heat insulation plate is inserted into the cavity 22. The heat insulation plate is made of aerogel.

[0063] By setting a cavity 22 with a hexagonal cross-section, the adverse effects on the engineering plastic base 2 are minimized, ensuring the structural strength and rigidity of the battery cell module. At the same time, an aerogel insulation board is inserted into the cavity 22 to further block heat conduction between the engineering plastic base 2 and the bottom of the box, ensuring that the temperature of the battery cell module is not disturbed by the outside world and facilitating the temperature management of the battery cell module.

[0064] In one embodiment of the present invention, the current collector 31 is interconnected with the surface of the voltage and temperature data sampling module 8, and a positioning groove is provided on the surface of the voltage and temperature data sampling module 8, into which the current collector 31 is inserted.

[0065] By creating positioning grooves on the surface of the voltage and temperature data sampling module 8, the current collector 31 can be inserted into the positioning grooves, thereby positioning the corrugated liquid cooling pipes 3 in the battery cell module. This facilitates the installation of single or double chains corresponding to different corrugated liquid cooling pipes 3 during battery cell module assembly. It also prevents the single or double chains in the battery cell module from being misaligned, skewed, or improperly installed due to the influence of the coated thermally conductive structural adhesive and high-strength structural adhesive. This would prevent the assembled battery cell module from deviating from the design requirements in terms of external dimensions, affecting the structural strength, structural rigidity, and normal use of the battery cell module.

[0066] The specific workflow is as follows:

[0067] The large cylindrical cell 1 is arranged horizontally, and the number of layers of the large cylindrical cell 1 can be adjusted according to the height of the battery pack box.

[0068] The two adjacent layers of large cylindrical cells 1 are arranged in a triangular staggered manner, and no structural fasteners are used to group the large cylindrical cells 1.

[0069] Two large cylindrical cells 1 are isolated by a corrugated liquid cooling tube 3. The outer surface of the corrugated liquid cooling tube 3 is coated with a pressure-resistant insulating coating. When assembling, the front and back of the corrugated liquid cooling tube 3 are coated with a paste-like thermally conductive structural adhesive. The large cylindrical cells 1 and the corrugated liquid cooling tube 3 are pressed together with adhesive on the top and bottom.

[0070] The bottom layer of the large cylindrical cell 1 is an engineering plastic base 2 with a wavy surface on top. The engineering plastic base 2 has an avoidance design with an avoidance groove 21, into which the lower wavy liquid cooling pipe 3 is embedded. The engineering plastic base 2 and the bottom wavy liquid cooling pipe 3 are bonded together with a paste-like thermally conductive structural adhesive.

[0071] The entire cell module is stacked and bonded together using a paste-like thermally conductive structural adhesive. The cell module is also bonded to the battery pack box at the bottom. At the same time, the bottom of the cell module is an engineering plastic base 2, which can effectively isolate the heat conduction between the battery pack box and the cell module, effectively ensuring that the cell module is not affected by the external temperature, maximizing the thermal management performance of the cell module, and improving the temperature consistency of the large cylindrical cells 1 in the cell module.

[0072] The top of the battery cell module has a signal acquisition and processing FPC7, which transmits the acquired voltage, temperature, and other data to the voltage and temperature data sampling module 8 on the side wall of the battery cell module.

[0073] The wave liquid cooling pipe 3 adopts a dual-pipe design, and forms a return flow through the collector 31 on one side, thereby forming a hot and cold liquid counter-current circulation. The hot and cold counter-current can effectively reduce the temperature difference between the large cylindrical cells 1 in the entire cell module.

[0074] A connecting groove 41 is formed on the surface of the uniform temperature aluminum plate 4. Then, when applying the paste thermally conductive structural adhesive, the connecting groove 41 is avoided. Then, a high-strength structural adhesive is applied to the connecting groove 41 so that after the battery cell module is assembled, the large cylindrical battery cells 1 on both sides of the uniform temperature aluminum plate 4 can be connected to each other through the high-strength structural adhesive. This further improves the connection strength between the large cylindrical battery cells 1 while ensuring that the thermal conductivity and fixing effect of the paste thermally conductive structural adhesive on the large cylindrical battery cells 1 remains unchanged, so that the structural strength and structural rigidity of the assembled battery cell module are good.

[0075] By opening connecting slots 41 in the middle and on both sides of the width direction of the uniform temperature aluminum plate 4, the middle and both ends of the large cylindrical battery cells 1 on both sides of the uniform temperature aluminum plate 4 can be connected, thereby further improving the connection strength between the large cylindrical battery cells 1 on the upper and lower sides of the uniform temperature aluminum plate 4.

[0076] Meanwhile, plastic sheets are installed at the connecting slots 41 at both ends to guide and adhere the applied high-strength structural adhesive, thus preventing the high-strength structural adhesive from failing to be applied and adhered, and from spreading or flowing.

[0077] By opening the cavity 22, the thermal resistance of heat transfer inside the engineering plastic base 2 is increased, and the heat conduction between the engineering plastic base 2 and the cell module, and between the engineering plastic base 2 and the battery pack PACK box is further isolated.

[0078] Meanwhile, by setting protrusions on the bottom surface of the engineering plastic base 2, the connection between the engineering plastic base 2 and the battery pack box is made more secure.

[0079] By setting a cavity 22 with a hexagonal cross-section, the adverse effects on the engineering plastic base 2 are minimized, ensuring the structural strength and rigidity of the battery cell module. At the same time, an insulation board made of aerogel is inserted into the cavity 22 to further block the heat conduction between the engineering plastic base 2 and the bottom of the box.

[0080] By creating positioning grooves on the surface of the voltage and temperature data sampling module 8, the current collector 31 can be inserted into the positioning grooves, thereby positioning the corrugated liquid cooling pipes 3 in the battery cell module. This facilitates the installation of single or double chains corresponding to different corrugated liquid cooling pipes 3 during battery cell module assembly. It also prevents the single or double chains in the battery cell module from being misaligned, skewed, or improperly installed due to the influence of the coated thermally conductive structural adhesive and high-strength structural adhesive. This would prevent the assembled battery cell module from deviating from the design requirements in terms of external dimensions, affecting the structural strength, structural rigidity, and normal use of the battery cell module.

[0081] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large cylindrical battery cell module with an integrated thermal management system, characterized in that: The battery pack includes a corrugated liquid cooling tube (3) and a large cylindrical battery cell (1). The outer surface of the corrugated liquid cooling tube (3) is coated with a pressure-resistant insulating layer. The surface of the corrugated liquid cooling tube (3) is coated with a paste-like thermally conductive structural adhesive. The large cylindrical battery cell (1) is pressed onto the surface of the corrugated liquid cooling tube (3) to form a chain. The chains are stacked together with each other through the thermally conductive structural adhesive to form a group of battery cells. The group of battery cells are laid flat in the battery pack PCK box. Busbars (6) are installed on both sides of the battery cell group, a signal acquisition and processing FPC (7) is installed on the top of the battery cell group, and a voltage and temperature data sampling module (8) is installed at the end of the battery cell group. The voltage and temperature data sampling module (8) is connected to the signal acquisition and processing FPC (7). It also includes an engineering plastic base (2), the upper surface of which is a wave-like surface, and a clearance groove (21) is provided on the wave-like surface; Large cylindrical cells (1) are installed on the front side of the corrugated liquid cooling tube (3) to form a single chain, and large cylindrical cells (1) are installed on both the front and back sides of the corrugated liquid cooling tube (3) to form a double chain. The single chain is fixedly installed on the corrugated surface by structural adhesive. The corrugated liquid cooling pipe (3) in the single chain is pressed into the clearance groove (21). The double chain is stacked on the single chain to form a battery cell module. A uniform temperature aluminum plate (4) is installed between the double chain and the single chain. The front and back surfaces of the uniform temperature aluminum plate (4) are coated with a paste-like thermally conductive structural adhesive. In the battery cell module, two adjacent layers of battery cells are arranged in a triangular staggered manner. The corrugated liquid cooling pipe (3) is a double-pipe design. A collector box (31) is installed on one side of the corrugated liquid cooling pipe (3). The corrugated liquid cooling pipe (3) forms a backflow through the collector box (31), so that the cooling liquid flowing in the corrugated liquid cooling pipe (3) has a counter-current circulation between hot and cold liquids, thereby reducing the temperature difference between different large cylindrical cells (1) in the entire cell module by using hot and cold counter-current circulation. The surface of the temperature-equalizing aluminum plate (4) is provided with a connecting hole groove (41). The temperature-equalizing aluminum plate (4) includes at least three connecting hole grooves (41) located at both ends and the middle in the width direction. The connecting hole groove (41) in the middle of the temperature-equalizing aluminum plate (4) is located between the two pipes of the corrugated liquid cooling pipe (3). Plastic sheets are bonded in the connecting hole grooves (41) at both ends in the width direction of the temperature-equalizing aluminum plate (4). The cross-section of the plastic sheet is an arc shape facing the direction of the large cylindrical cell (1). The part of the connecting hole groove (41) is filled with structural adhesive. The current collector (31) is connected to the surface of the voltage and temperature data sampling module (8). A positioning groove is provided on the surface of the voltage and temperature data sampling module (8), and the current collector (31) is inserted into the positioning groove. The engineering plastic base (2) has a cavity (22) inside, and the cavities (22) are staggered with each other. The bottom surface of the engineering plastic base (2) is provided with uniformly distributed protrusions. The cavity (22) has a hexagonal cross-section, and a heat insulation plate is inserted inside the cavity (22). The heat insulation plate is made of aerogel.

2. The large cylindrical battery cell module with an integrated thermal management system according to claim 1, characterized in that: The projections of the uniform temperature aluminum plate (4) and the engineering plastic base (2) on the horizontal plane coincide with each other, and the projection of the corrugated liquid cooling pipe (3) on the horizontal plane is located inside the projection of the uniform temperature aluminum plate (4) on the horizontal plane.

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