An embedded direct cooling heat dissipation system for energy storage battery cell

Abstract

The utility model relates to the technical field of heat management discloses a kind of energy storage battery cell embedded direct cooling heat dissipation system, by directly embedding microchannel unit inside battery cell, make insulating cooling medium circulate in the core area of battery cell, heat can be quickly taken away without again crossing multiple interfaces such as shell, cold plate, significantly reduce thermal resistance and the temperature difference between monomer battery cell;And insulating heat conductor both ensures electrical safety and further eliminates contact thermal resistance, realizes good temperature uniformity, high temperature control precision internal direct cooling.Compared with the existing scheme that wind cooling is noisy, liquid cooling plate is large in size, immersion cost is high and safety hidden trouble is prominent, the system structure is compact, the heat dissipation path is short, does not need additional pressure, can prolong battery life under the premise of not increasing external space, reduce capacity attenuation risk, and meet the stringent requirements of energy storage system on temperature control, safety and long-term stable operation in a low-cost, high-reliability manner.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology, and in particular to an embedded direct cooling heat dissipation system for energy storage cells. Background Technology

[0002] Due to the stringent performance requirements for energy storage cells in terms of temperature control, safety, lifespan, and reliability, the thermal management design of energy storage cells must implement extremely strict control over the temperature control aspect. During operation, the performance of energy storage cells is highly susceptible to temperature fluctuations. Excessively high or low temperatures, or significant temperature differences within or between cells, can significantly negatively impact the normal operation and overall quality of the cells. Specifically, inappropriate temperature conditions may accelerate the decay of chemical substances within the cell, leading to capacity decay, increased internal resistance, and ultimately shortening the cell's lifespan. Furthermore, they may compromise the stability of the cell's internal structure, increasing the risk of leakage, short circuits, and other safety hazards, severely affecting the cell's reliability. Therefore, equipping the cell system with a high-performance thermal management system is essential. Its core purpose is to create a suitable operating temperature environment for the cells, thereby more effectively protecting their lifespan and reliability, and ensuring the long-term stable and efficient operation of the energy storage system.

[0003] Currently, the main technologies used in the thermal management design of energy storage cells are air-cooled and liquid-cooled.

[0004] Air-cooled heat dissipation designs primarily dissipate heat by forcing airflow across the surface of the battery cells. However, this method has significant limitations, with relatively low heat dissipation efficiency. The effectiveness of air-cooling technology is highly susceptible to external factors such as ambient temperature and wind speed. In high-temperature environments, the air's heat absorption capacity decreases, significantly reducing its heat dissipation effect; unstable wind speeds also affect the heat exchange efficiency between the air and the battery cell surface. Furthermore, air-cooled designs perform poorly in terms of cell thermal uniformity, with significant temperature differences potentially occurring in cells at different locations due to uneven airflow. More importantly, air-cooled systems generate considerable noise during operation, causing interference to the surrounding environment; simultaneously, their maintenance costs are relatively high, requiring regular cleaning and replacement of components such as fans and filters, increasing the overall operating costs of the energy storage system. Given these numerous drawbacks, air-cooled heat dissipation designs are increasingly unable to meet the stringent temperature control requirements of modern energy storage cells.

[0005] Liquid cooling designs encompass two common forms. One employs an indirect liquid cooling plate, where the plate conducts heat through indirect contact with the cell surface. However, this design has significant drawbacks. During heat dissipation, the temperature difference between individual cells is relatively large, making it difficult to achieve uniform cell temperature control. Furthermore, because the liquid cooling plate is located outside the cell, heat must pass through multiple dielectric layers to be transferred to the coolant, resulting in low heat dissipation efficiency. Simultaneously, the heat conduction path is relatively complex, involving heat transfer between multiple components, increasing thermal resistance and further impacting heat dissipation. Moreover, the design and installation of the liquid cooling plate require substantial space, and the manufacturing costs of components such as the coolant circulation system and the liquid cooling plate are high, significantly increasing the overall cost of the energy storage system.

[0006] Another liquid cooling design employs immersion liquid cooling. Compared to indirect liquid cooling, while immersion liquid cooling improves heat dissipation efficiency to some extent, it also incurs extremely high costs. Because the immersion fluid needs to be in direct contact with the battery cell's conductors, extremely stringent requirements are placed on its insulation properties. The immersion fluid must possess extremely high insulation performance to prevent safety accidents such as short circuits. Simultaneously, immersion liquid cooling requires extremely high environmental cleanliness; even the smallest impurities can affect the battery cell's performance and safety. Furthermore, the immersion fluid is typically flammable, which undoubtedly increases the safety hazards of the energy storage system. In the event of a leak or contact with a source of ignition, it could lead to a serious fire. Moreover, during the heat dissipation process, the immersion oil only absorbs heat by contacting the battery cell surface, without directly penetrating the cell's interior for heat dissipation, resulting in limitations in heat dissipation efficiency.

[0007] In summary, given that existing air-cooled and liquid-cooled heat dissipation designs both have varying degrees of shortcomings and cannot fully meet the stringent thermal management requirements of energy storage cells, there is an urgent need to further improve and innovate existing technologies in order to develop more efficient, reliable, and economical thermal management solutions for energy storage cells.

[0008] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0009] This invention provides an embedded direct cooling heat dissipation system for energy storage cells. By embedding microchannel units inside the cell, the cooling medium flows directly through the core area of ​​the cell, significantly reducing thermal resistance and improving temperature uniformity.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] An embedded direct cooling heat dissipation system for energy storage cells includes a cell, an insulating heat conductor, a microchannel unit, a liquid inlet device, a liquid outlet device, and a cooling medium; wherein,

[0012] The microchannel unit is embedded inside the battery cell and has microchannels for the flow of the cooling medium.

[0013] The insulating heat conductor is disposed between the battery cell and the microchannel unit;

[0014] The liquid inlet device and the liquid outlet device are located outside the battery cell and are respectively connected to the microchannel unit to drive the cooling medium to circulate within the microchannel unit.

[0015] Furthermore, in the embedded direct cooling system for the energy storage cell, the heat dissipation area of ​​the microchannel unit covers the top, middle, and bottom regions of the cell.

[0016] Furthermore, in the energy storage cell embedded direct cooling system, the orientation of the microchannel is consistent with the height direction of the cell.

[0017] Furthermore, in the energy storage cell embedded direct cooling system, the microchannel includes two main microchannels and several branch microchannels;

[0018] One of the main channel microchannels is connected to the liquid inlet device, and the other main channel microchannel is connected to the liquid outlet device;

[0019] Each of the branch microchannels is connected to the liquid inlet device and the liquid outlet device, respectively.

[0020] Furthermore, in the energy storage cell embedded direct cooling system, the microchannel unit is a thin sheet structure.

[0021] Furthermore, in the energy storage cell embedded direct cooling system, the microchannel unit is made of a material with high thermal conductivity.

[0022] Furthermore, in the energy storage cell embedded direct cooling system, the liquid inlet device and the liquid outlet device are respectively equipped with quick connectors, which can be detachably connected to the external cooling circuit.

[0023] Furthermore, in the energy storage cell embedded direct cooling heat dissipation system, the insulating heat conductor is a thermally conductive silicone sheet.

[0024] Furthermore, in the embedded direct cooling heat dissipation system of the energy storage cell, the connection between the microchannel unit and the liquid inlet device and the liquid outlet device is provided with a sealing gasket.

[0025] Furthermore, the energy storage cell embedded direct cooling heat dissipation system also includes a temperature sensor and an external controller;

[0026] The temperature sensor is disposed on the surface of the battery cell or at the outlet of the microchannel unit for real-time monitoring of the temperature of the battery cell.

[0027] The external controller is electrically connected to the temperature sensor and is used to adjust the flow rate of the cooling medium in real time according to the monitored temperature of the battery cell.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention provides an embedded direct cooling system for energy storage cells. By directly embedding microchannel units inside the cell, the insulating cooling medium circulates within the core area of ​​the cell. Heat is rapidly dissipated without having to cross multiple interfaces such as the outer shell and cold plate, significantly reducing thermal resistance and temperature differences between individual cells. The insulating heat conductor ensures electrical safety and further eliminates contact thermal resistance, achieving excellent temperature uniformity and high temperature control accuracy through internal direct cooling. Compared to existing solutions that suffer from high noise from air cooling, large liquid cooling plates, and high costs and safety hazards associated with immersion cooling, this system features a compact structure, short heat dissipation path, and no need for additional pressurization. It can extend cell life and reduce capacity decay risk without increasing external space, meeting the stringent requirements of energy storage systems for temperature control, safety, and long-term stable operation in a low-cost and highly reliable manner.

[0030] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a front sectional view of an embedded direct cooling heat dissipation system for energy storage cells provided in an embodiment of this utility model;

[0033] Figure 2 This is a top view of an embedded direct cooling heat dissipation system for energy storage cells provided in an embodiment of this utility model.

[0034] Figure label:

[0035] 1. Battery cell, 2. Insulating heat conductor, 3. Microchannel unit, 4. Liquid inlet device, 5. Liquid outlet device. Detailed Implementation

[0036] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0037] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0038] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0039] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0040] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0041] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0042] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0043] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] Please refer to Figure 1 This utility model provides an embedded direct cooling heat dissipation system for energy storage cells. The system is rich and sophisticated, covering key components such as the cell 1, insulating heat conductor 2, microchannel unit 3, liquid inlet device 4, liquid outlet device 5, and cooling medium. The components work together to build an efficient and reliable heat dissipation system.

[0046] The microchannel unit 3 employs a unique embedded design, precisely positioned within the core area of ​​the battery cell 1. It features carefully crafted microchannels that allow for the smooth flow of the cooling medium. These microchannels, resembling a sophisticated network of blood vessels, provide efficient flow channels for the cooling medium, ensuring it can fully contact the heat-generating components within the battery cell, thus achieving rapid heat conduction and dissipation.

[0047] The insulating heat conductor 2 is cleverly positioned between the battery cell 1 and the microchannel unit 3, playing a crucial dual role. On the one hand, its excellent insulation properties effectively block the electrical connection between the battery cell and the microchannel unit, providing reliable electrical safety for the entire system and preventing safety accidents caused by electrical faults such as leakage. On the other hand, its good thermal conductivity greatly reduces the contact thermal resistance between the battery cell and the microchannel unit, allowing heat to be transferred from the battery cell to the cooling medium more quickly and efficiently, further improving heat dissipation efficiency.

[0048] The liquid inlet device 4 and the liquid outlet device 5 are strategically positioned outside the battery cell 1 and are in close communication with the microchannel unit 3. The liquid inlet device 4 is responsible for precisely introducing the cooling medium into the microchannel unit 3, while the liquid outlet device 5 promptly discharges the cooling medium that has absorbed heat, thus forming a complete circulation system. Through this ingenious design, the cooling medium is driven to circulate continuously and stably within the microchannel unit 3, ensuring that the heat generated by the battery cell during operation can be continuously carried away, maintaining a stable battery cell temperature.

[0049] The embedded direct cooling system for energy storage cells proposed in this embodiment achieves direct circulation of the cooling medium within the core area of ​​cell 1 through the innovative design of directly embedding the microchannel unit 3 inside cell 1. This breakthrough design eliminates the need for heat to be dissipated through multiple interfaces such as the outer shell and cold plate, as in traditional heat dissipation methods. Instead, heat can be exchanged directly with the cooling medium inside the cell, significantly reducing thermal resistance, effectively minimizing temperature differences between individual cells, and achieving uniform temperature distribution within the cell. Simultaneously, the ingenious use of an insulating thermal conductor not only ensures the electrical safety of the system but also further eliminates contact thermal resistance, giving the entire cooling system significant advantages such as good temperature uniformity and high temperature control accuracy, achieving true internal direct cooling.

[0050] Compared to existing heat dissipation solutions, this system offers numerous unparalleled advantages. Traditional air cooling, while relatively simple in structure, generates significant noise during operation, interfering with the surrounding environment. Furthermore, its heat dissipation efficiency is greatly affected by environmental factors, making it difficult to meet the heat dissipation requirements of high-power energy storage cells. Liquid cooling plates, on the other hand, suffer from bulky size, occupying considerable space and increasing the overall weight and cost of the system. While immersion cooling improves efficiency to some extent, it is prohibitively expensive, and the immersion cooling medium typically possesses flammability and corrosiveness, posing significant safety hazards and requiring extremely high levels of system sealing and safety.

[0051] In contrast, this energy storage cell-embedded direct cooling system features a compact structure and a short heat dissipation path, efficiently dissipating the heat generated by the cells. Simultaneously, the system achieves cooling medium circulation without additional pressurization, reducing system complexity and operating costs. Without increasing external space, it effectively extends cell lifespan and reduces the risk of capacity degradation, providing strong support for the long-term stable operation of the energy storage system. Furthermore, this system meets the stringent requirements of energy storage systems for temperature control, safety, and long-term stable operation in a low-cost and highly reliable manner, demonstrating broad market application prospects and significant economic and social benefits.

[0052] Please refer to this again. Figure 1 In one embodiment of this invention, the microchannel unit 3 has undergone meticulous and highly targeted design optimization, enabling its heat dissipation area to fully cover the top, middle, and bottom regions of the battery cell 1. This comprehensive coverage design was determined through in-depth theoretical research and extensive practical verification. Its core purpose is to ensure that the battery cell 1 can achieve an extremely uniform heat dissipation effect during operation, thereby enabling the battery cell 1 to possess good isothermal properties.

[0053] From the perspective of heat transfer principles, complex electrochemical reactions occur inside the battery cell 1 during charging and discharging, generating heat. If this heat cannot be dissipated in a timely and uniform manner, significant temperature differences will occur in different parts of the battery cell 1. Uneven temperature distribution not only affects the performance of the battery cell 1, such as reducing its charging and discharging efficiency and shortening its cycle life, but may also cause safety hazards, such as localized overheating leading to internal short circuits or fires. In this embodiment, the microchannel unit 3's comprehensive coverage of the top, middle, and bottom areas of the battery cell 1 is like weaving a fine and efficient heat dissipation network for the battery cell 1. It can quickly and evenly remove the heat generated in various parts of the battery cell 1, effectively avoiding localized excessively high or low temperatures, thereby ensuring that the battery cell 1 has good isothermal properties.

[0054] Specifically, in the internal structural design of the microchannel unit 3, the orientation of the microchannels is precisely planned to align with the height direction of the battery cell 1. This design offers several significant advantages. From a thermal conductivity perspective, when the microchannel orientation is aligned with the height direction of the battery cell, the cooling medium can directly exchange heat along the direction of heat generation in the battery cell 1 as it flows within the microchannels. The heat generated inside the battery cell 1 can be transferred to the cooling medium with the shortest distance and fastest speed, reducing heat loss and delay during the transfer process and significantly improving heat dissipation efficiency.

[0055] From a fluid dynamics perspective, this orientation design helps optimize the flow state of the cooling medium. When the cooling medium flows within the microchannels aligned with the height of the battery cell, it can form a relatively stable laminar flow state, reducing the generation of turbulence and eddies. This stable flow state not only reduces energy loss during the cooling medium flow process and improves the overall energy efficiency of the system, but also ensures that the cooling medium is uniformly distributed within the microchannels, allowing all parts of battery cell 1 to be adequately cooled, further enhancing the isothermal properties of battery cell 1.

[0056] Furthermore, this design, where the microchannel orientation aligns with the height of the battery cell, facilitates system layout and installation. In practical applications, energy storage systems typically require a compact spatial layout. This design allows for better integration of the microchannel unit 3 with the battery cell 1, reducing space requirements and improving the overall compactness and reliability of the system. Simultaneously, it facilitates subsequent maintenance and repair, reducing system operation and maintenance costs.

[0057] In summary, the comprehensive coverage of the top, middle and bottom areas of the battery cell 1 by the microchannel unit 3 in this embodiment, as well as the design of the microchannel orientation being consistent with the height direction of the battery cell, are innovative achievements resulting from careful consideration and optimization. They can provide efficient and uniform heat dissipation for the battery cell 1, ensuring that the battery cell 1 maintains good performance and safety during long-term operation.

[0058] In one embodiment of this example, the microchannel unit 3 adopts an ingenious and scientifically reasonable structural design. The layout of its internal microchannels is like a sophisticated urban traffic network, including two main microchannels and several carefully planned branch microchannels. The microchannels cooperate with each other and work together to build an efficient and stable heat dissipation channel system.

[0059] From an overall layout perspective, one of the main microchannels, thanks to its unique structural design, achieves a tight and reliable connection with the liquid inlet device 4. This design allows the cooling medium to flow smoothly and stably into the main microchannel under the drive of the liquid inlet device 4, laying the foundation for subsequent circulation within the microchannel unit 3. The other main microchannel is precisely connected to the liquid outlet device 5, which promptly and effectively draws the cooling medium that has absorbed heat from the battery cell 1 out of the microchannel unit 3 and discharges it from the system through the liquid outlet device 5, thereby achieving continuous renewal of the cooling medium and continuous heat dissipation.

[0060] Further delving into the detailed design of the microchannels, each branch microchannel is cleverly connected to both the liquid inlet device 4 and the liquid outlet device 5. This connection between the branch microchannels and the liquid inlet device 4 allows the cooling medium to flow from the main microchannels into each branch microchannel, like a trickle of water penetrating into every critical part of the battery cell 1, ensuring that the heat generated inside the battery cell 1 is absorbed comprehensively and without any blind spots.

[0061] Meanwhile, the connection between the branch microchannels and the liquid outlet device 5 forms a complete heat dissipation loop. As the cooling medium absorbs heat and flows within the branch microchannels, it gradually transfers the heat to the microchannel walls. Then, through heat exchange between the walls and the surrounding environment, and as the cooling medium flows towards the liquid outlet device 5, the heat is carried out of the microchannel unit 3. This design enables the cooling medium to form a multi-path, multi-level circulating flow pattern within the microchannel unit 3, significantly improving heat dissipation efficiency.

[0062] From the perspective of heat transfer efficiency, this microchannel design combining main and branch channels can fully utilize the flow characteristics of the cooling medium, enabling it to form a fully developed laminar flow state within the microchannel unit 3. This enhances the convective heat transfer coefficient between the cooling medium and the microchannel walls, thereby accelerating heat transfer. Furthermore, the presence of multiple branch microchannels increases the contact area between the cooling medium and the battery cell 1, allowing heat to be transferred more rapidly from the battery cell 1 to the cooling medium, further improving the heat dissipation effect.

[0063] From the perspective of system reliability, this redundant microchannel structure has a certain fault tolerance. Even if a branch microchannel is blocked or damaged, other branch microchannels can still work normally, ensuring that the cooling medium can continue to circulate within the microchannel unit 3, maintaining the basic heat dissipation requirements of cell 1, avoiding the risk of the entire heat dissipation system being paralyzed due to a local fault, and greatly improving the stability and reliability of the system.

[0064] In summary, the microchannel unit 3 in this embodiment adopts a design that combines two main microchannels and several branch microchannels, and each microchannel is connected to the liquid inlet device 4 and the liquid outlet device 5 respectively. This is an innovative, scientific and reasonable heat dissipation structure design with great practical value, which can provide efficient, stable and reliable heat dissipation for the battery cell 1.

[0065] In one embodiment of this invention, the microchannel unit 3 adopts a sheet-like structure design.

[0066] From a space utilization perspective, every inch of space inside cell 1 is crucial for improving its performance and energy density. If the heat dissipation structure is designed to be bulky, it will occupy a significant amount of internal space in cell 1, thus limiting the amount of active material that can be filled and consequently reducing the cell's energy density. In this embodiment, the thin-film microchannel unit 3 acts like a master of space engineering, cleverly embedded within cell 1 with its extremely thin thickness, minimizing the space occupied. This design allows cell 1 to be filled with more active material within a limited space, creating favorable conditions for improving the cell's energy density.

[0067] In terms of ensuring heat dissipation, the sheet-like structure has unique advantages. Despite its thinness, the carefully designed microchannel layout and optimized fluid dynamics ensure efficient flow of the cooling medium within the microchannels. As the cooling medium flows through the sheet-like microchannel unit 3, it can fully exchange heat with the microchannel walls, rapidly carrying away the heat generated by the battery cell 1. Furthermore, the sheet-like structure shortens the heat transfer path, reducing heat loss and delay during transfer, thus ensuring efficient and timely heat dissipation.

[0068] Energy density is a crucial performance indicator for battery cells, directly impacting the overall performance and application range of the energy storage system. In this embodiment, the design of the thin-film microchannel unit 3 plays a key role in ensuring energy density of battery cell 1 while guaranteeing effective heat dissipation. By reducing the space occupied by the heat dissipation structure within the cell, more electrode active material can be accommodated, thereby increasing the cell's energy storage capacity. Simultaneously, efficient heat dissipation maintains the cell within a suitable temperature range, preventing performance degradation and shortened lifespan due to overheating, further ensuring the stability of the cell's energy density during long-term use.

[0069] Furthermore, the design of the sheet-like microchannel unit 3 also boasts excellent process adaptability and manufacturability. During production, advanced micro-nano manufacturing technologies, such as photolithography and etching, can be employed to precisely fabricate the sheet-like structure and microchannels, ensuring product consistency and quality stability. Moreover, this structure facilitates integration and assembly with the battery cell 1, improving production efficiency, reducing production costs, and providing favorable conditions for large-scale industrial production.

[0070] In summary, the microchannel unit 3 in this embodiment adopts a thin-film structure design, which is an innovative design that integrates many advantages such as space optimization, heat dissipation guarantee, energy density improvement and strong process adaptability. It provides strong technical support and solutions for the high-performance and high-energy-density development of energy storage cells.

[0071] In one embodiment of this invention, the selection of materials for the microchannel unit 3 and the insulating heat conductor 2 has been carefully considered and precisely designed, aiming to comprehensively improve the performance and reliability of the cell heat dissipation system.

[0072] Specifically, the microchannel unit 3 is carefully made of a high thermal conductivity material, a choice that is key to improving heat dissipation efficiency. High thermal conductivity materials possess excellent thermal conductivity, enabling them to rapidly transfer the heat generated by the battery cell 1 to the cooling medium within the microchannel in a short time. From a microscopic perspective, the crystal structure or molecular arrangement of the high thermal conductivity material allows heat to be transferred with relatively low resistance.

[0073] In practical applications, when the battery cell 1 is charging and discharging, complex electrochemical reactions occur inside, generating a large amount of heat. If this heat cannot be dissipated in time, the battery cell temperature will rise, affecting its performance and lifespan. The microchannel unit 3, made of a highly thermally conductive material, can quickly respond to changes in the battery cell's temperature, rapidly guiding heat to the microchannel surface for efficient heat exchange with the flowing cooling medium. After absorbing heat, the cooling medium flows out of the system through the liquid outlet device 5, carrying away the heat and effectively cooling the battery cell 1.

[0074] Compared to traditional heat dissipation materials, high thermal conductivity materials have higher thermal conductivity, enabling them to transfer more heat under the same temperature difference and heat dissipation area. This means that, while ensuring heat dissipation performance, a more compact microchannel structure design can be adopted, further reducing the space occupied inside the battery cell and making it possible to accommodate more active materials, thus helping to improve the energy density of the battery cell. At the same time, the good stability and corrosion resistance of high thermal conductivity materials also ensure that the microchannel unit 3 can maintain stable heat dissipation performance during long-term use, reducing the problem of decreased heat dissipation efficiency due to material aging or corrosion.

[0075] The insulating heat conductor 2 is made of thermally conductive silicone sheet. This material selection fully considers the dual requirements of insulation and heat conduction during the operation of the battery cell. The thermally conductive silicone sheet has good insulation properties, which can effectively isolate the electrical connection between the battery cell 1 and the microchannel unit 3, prevent safety accidents caused by leakage or short circuit, and provide reliable protection for the safe operation of the battery cell.

[0076] In terms of thermal conductivity, the thermally conductive silicone pad has excellent thermal conductivity. It can fill the tiny gaps between the battery cell 1 and the microchannel unit 3, reducing contact thermal resistance and allowing heat to be transferred more smoothly from the battery cell to the microchannel unit 3. Its soft texture allows it to adapt to battery cells and microchannel units of different shapes and surfaces, ensuring good fit and further improving thermal conductivity.

[0077] In addition, the thermally conductive silicone pad also possesses excellent elasticity and shock absorption properties. During the use of the battery cell, it may be subjected to external forces such as vibration and impact. The thermally conductive silicone pad can buffer and absorb shocks, protecting the battery cell and microchannel unit 3 from damage and extending the service life of the equipment. At the same time, the thermally conductive silicone pad is easy to process and install, and can be cut and shaped according to actual needs, facilitating integration with the battery cell and microchannel unit, improving production efficiency, and reducing production costs.

[0078] In summary, in this embodiment, the microchannel unit 3 is made of a high thermal conductivity material, and the insulating thermal conductor 2 is a thermally conductive silicone sheet. This material combination design fully utilizes the heat dissipation advantages of the high thermal conductivity material and the multiple functions of the thermally conductive silicone sheet, such as insulation, heat conduction, and buffering.

[0079] In one embodiment of this invention, the liquid inlet device 4 and the liquid outlet device 5 are ingeniously designed, each equipped with a quick connector. This detailed design brings great convenience and advantages to the connection between the entire cell heat dissipation system and the external cooling circuit.

[0080] Quick-connect couplings typically consist of a plug and a socket, with a sophisticated internal sealing structure and connection mechanism. When connecting the inlet device 4 or outlet device 5 to an external cooling circuit, simply insert the plug of the quick-connect coupling accurately into the socket. During insertion, the sealing ring on the plug will tightly adhere to the inner wall of the socket, forming a reliable seal to prevent coolant leakage. Simultaneously, the connection mechanism automatically locks, ensuring a secure connection between the plug and socket, preventing loosening or detachment due to vibration or external force during use. For disassembly, simply operate the unlocking device on the quick-connect coupling to easily pull out the plug for quick separation.

[0081] During the installation of the battery cell cooling system, traditional connection methods often require complex tools and lengthy installation time, and demand a high level of technical skill from the installers. However, by using a liquid inlet device 4 and a liquid outlet device 5 equipped with quick-connect couplings, installers can quickly connect to the external cooling circuit without specialized tools, significantly shortening installation time and improving efficiency. During system maintenance, if it is necessary to inspect or replace a component in the battery cell, microchannel unit 3, or external cooling circuit, the connection can be quickly disconnected via the quick-connect couplings, allowing the part requiring maintenance to be removed individually for operation. After maintenance, it can be quickly reconnected without requiring large-scale disassembly of the entire system, greatly reducing maintenance difficulty and cost.

[0082] In one embodiment of this invention, to ensure the stable, efficient, and safe operation of the entire battery cell heat dissipation system, meticulous and crucial sealing treatment was performed on the connection points between the microchannel unit 3 and the liquid inlet device 4 and the liquid outlet device 5. Specifically, sealing gaskets were carefully installed at these critical connection points, a measure that has many important implications and significant effects.

[0083] From a sealing principle perspective, gaskets are typically made of materials with good elasticity and sealing properties, such as rubber and silicone. When the microchannel unit 3 is connected to the liquid inlet device 4 or the liquid outlet device 5, the gasket is compressed between the two connecting parts. Due to its elastic properties, the gasket can tightly fill the tiny unevenness and gaps on the surface of the connection, forming a continuous and dense sealing barrier. This sealing barrier can effectively prevent the cooling medium from leaking out of the connection, ensuring that the cooling medium can only flow along a prescribed path in the pre-designed microchannels and cooling circuits, thereby maintaining the normal operation of the system.

[0084] Sealing gaskets play an irreplaceable and crucial role in preventing coolant leakage. Coolant plays a vital role in transferring heat in the battery cell cooling system, and its properties may vary depending on the system design; common examples include water and ethylene glycol solutions. If coolant leakage occurs at connection points, it can lead to a series of serious consequences. Firstly, leakage reduces the flow rate of coolant within the system, thereby decreasing heat dissipation efficiency. This prevents the battery cell from effectively dissipating the generated heat, leading to an increase in cell temperature. Excessive temperature accelerates internal chemical reactions within the cell, causing performance degradation, shortened lifespan, and even thermal runaway, resulting in safety accidents. Secondly, coolant leakage can also damage surrounding electronic components and equipment. For example, if the coolant is a conductive solution, leakage may cause short circuits and damage other electrical equipment; even non-conductive coolants can affect the normal operating environment of equipment, such as increasing humidity and corroding metal parts.

[0085] In summary, in this embodiment, the placement of a sealing gasket at the connection between the microchannel unit 3 and the liquid inlet device 4 and liquid outlet device 5 is a well-thought-out and crucial design. By forming a reliable sealing barrier, it effectively prevents leakage of the cooling medium, providing a solid guarantee for the stable operation of the battery cell heat dissipation system, the performance and lifespan of the battery cell, and the safety of surrounding equipment.

[0086] In one embodiment of this invention, the energy storage cell embedded direct cooling system has undergone comprehensive and meticulous optimization design. In addition to the key components mentioned above, it also cleverly incorporates two core components: a temperature sensor and an external controller. The two work together to give the entire cooling system the ability to intelligently sense and precisely control, greatly improving the system's performance and reliability.

[0087] The temperature sensor, acting as the "sensory nerve" of the heat dissipation system, is carefully positioned on the surface of cell 1 and at the outlet of microchannel unit 3. These two key locations are chosen to comprehensively and accurately acquire temperature information from cell 1.

[0088] The external controller, acting as the "intelligent brain" of the heat dissipation system, connects electrically with the temperature sensor to achieve real-time data transmission and interaction. It possesses powerful data processing and logical judgment capabilities, enabling real-time analysis and decision-making based on the cell temperature information monitored by the temperature sensor. This allows for precise adjustment of the cooling medium flow rate; for example, increasing the flow rate to enhance heat dissipation and rapidly reduce the cell temperature to a safe range, or appropriately reducing the flow rate to decrease energy consumption and improve system efficiency. This method of adjusting the cooling medium flow rate in real-time based on the actual cell temperature achieves dynamic balance and precise control of the heat dissipation system. It ensures that the cell always operates within a suitable temperature environment, extending its lifespan, while also avoiding unnecessary energy waste and reducing system operating costs.

[0089] In summary, in this embodiment, the embedded direct cooling system for energy storage cells achieves real-time monitoring of cell temperature and precise adjustment of cooling medium flow rate by incorporating temperature sensors and an external controller. This intelligent heat dissipation control method provides more reliable and efficient heat dissipation for energy storage cells, helping to improve the overall performance and stability of energy storage systems and promoting the application and development of energy storage technology in a wider range of fields.

[0090] Although this application uses terms such as battery cell and liquid cooling medium frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0091] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. An embedded direct cooling heat dissipation system for energy storage cells, characterized in that, It includes a battery cell (1), an insulating heat conductor (2), a microchannel unit (3), a liquid inlet device (4), a liquid outlet device (5), and a cooling medium; among which, The microchannel unit (3) is embedded inside the battery cell (1) and has microchannels for the flow of the cooling medium. The insulating heat conductor (2) is disposed between the battery cell (1) and the microchannel unit (3); The liquid inlet device (4) and the liquid outlet device (5) are located outside the battery cell (1) and are respectively connected to the microchannel unit (3) to drive the cooling medium to circulate within the microchannel unit (3).

2. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The heat dissipation area of ​​the microchannel unit (3) covers the top, middle and bottom regions of the battery cell (1).

3. The embedded direct cooling heat dissipation system for energy storage cells according to claim 2, characterized in that, The direction of the microchannel is consistent with the height direction of the battery cell (1).

4. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The microchannel includes two main microchannels and several branch microchannels; One of the main channel microchannels is connected to the liquid inlet device (4), and the other main channel microchannel is connected to the liquid outlet device (5); Each of the branch microchannels is connected to the liquid inlet device (4) and the liquid outlet device (5).

5. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The microchannel unit (3) has a sheet-like structure.

6. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The microchannel unit (3) is made of a material with high thermal conductivity.

7. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The liquid inlet device (4) and the liquid outlet device (5) are respectively equipped with quick connectors, which can be detachably connected to the external cooling circuit.

8. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The insulating heat conductor (2) is a thermally conductive silicone sheet.

9. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, The connection between the microchannel unit (3) and the liquid inlet device (4) and the liquid outlet device (5) is provided with a sealing gasket.

10. The embedded direct cooling heat dissipation system for energy storage cells according to claim 1, characterized in that, It also includes a temperature sensor and an external controller; The temperature sensor is disposed on the surface of the battery cell (1) or at the outlet of the microchannel unit (3) for real-time monitoring of the temperature of the battery cell (1); The external controller is electrically connected to the temperature sensor and is used to adjust the flow rate of the cooling medium in real time according to the monitored temperature of the battery cell (1).

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