Lithium battery core body hybrid thermal management structure based on morphological characteristics of positive regulation

Abstract

The invention discloses a lithium battery core body hybrid thermal management structure based on a positive-negative morphological feature, which is applied to thermal management of a lithium battery core body and comprises a heat dissipation shell, a liquid cooling assembly and a heat dissipation piece, the heat dissipation shell is of a positive-negative structure with a square outer part and a round inner part, the lithium battery core body is arranged in a round hole of the heat dissipation shell, the liquid cooling assembly is arranged on the heat dissipation shell, and the heat dissipation piece is arranged on the heat dissipation shell. The heat dissipation piece is arranged on the outer surface of the periphery of the heat dissipation shell and is used for passive air cooling and radial series connection of the lithium battery core body. Through mutual cooperation of the heat dissipation shell, the liquid cooling assembly and the heat dissipation piece, the heat dissipation efficiency of the lithium battery core bodies is improved, the uniformity of the overall temperature of the lithium battery is optimized, series-parallel connection of the lithium battery core bodies is facilitated, and the requirements of a system for high-energy density and large-capacity electric energy output are met.

Description

Technical Field

[0001] This invention relates to a hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong. Background Technology

[0002] With the support of national policies, pure electric vehicles will become one of the mainstream modes of transportation in the future, with power batteries serving as their power source. Lithium-ion batteries, due to their small size and high energy density, have become the primary choice for power supply and storage in pure electric vehicles. However, it is important to note that the optimal operating temperature for lithium-ion batteries is between 20 and 60°C. Exceeding this range will significantly impact battery life and driving range. Furthermore, lithium-ion batteries also suffer from uneven temperature distribution among their cells; excessively high or low temperatures will reduce their lifespan.

[0003] Currently, thermal management of lithium battery cells mainly employs liquid cooling, which is divided into indirect and direct cooling. Indirect cooling achieves heat dissipation through contact between a liquid cooling plate and the battery. While this method is low-cost and simple to design, it struggles to meet the high-power heat dissipation demands of batteries under high-rate discharge conditions. Furthermore, most liquid cooling systems only involve contact between the liquid cooling plate and the battery, resulting in relatively low heat exchange efficiency and poor compatibility with multiple batteries connected in series or parallel. Direct cooling, while capable of managing large-capacity batteries, suffers from drawbacks such as large size, weight, complex piping, and numerous auxiliary devices. It also carries the risk of coolant leakage and requires high sealing performance, thus increasing economic costs. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] The technical problem to be solved by this invention is that the thermal management structure of traditional lithium battery cells has low heat dissipation efficiency and is not convenient for series and parallel connection.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong, applied to the thermal management of lithium battery cells, comprising a heat dissipation shell, a liquid cooling assembly, and a heat dissipation component. The heat dissipation shell has a "jade cong" structure with an outer square and an inner circle. The lithium battery cell is disposed in the circular hole of the heat dissipation shell. The liquid cooling assembly is disposed on the heat dissipation shell for liquid cooling and axial series connection of the lithium battery cell. The heat dissipation component is disposed on the outer surface of the heat dissipation shell for passive air cooling and radial series connection of the lithium battery cell.

[0007] As a preferred embodiment of the hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong described in this invention, the liquid cooling component includes liquid channels and connectors. The liquid channels are distributed at the four apex corners inside the heat dissipation shell. Two adjacent hybrid thermal management structures for lithium battery cells are connected in series axially through the connectors to exchange heat generated by the lithium battery cells. The heat conducted from the heat dissipation shell is efficiently removed through the liquid medium with a high convective heat transfer coefficient.

[0008] As a preferred embodiment of the hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong described in this invention, the connector includes a gasket and a pagoda-shaped double connector. The gasket is disposed between two adjacent axially connected heat dissipation shells. The gasket has a first through hole that matches the liquid flow channel. Two adjacent axially connected liquid flow channels are connected by the pagoda-shaped double connector, which penetrates the first through hole on the gasket to realize the connection of the liquid flow channels between two adjacent hybrid thermal management structures for lithium battery cells.

[0009] As a preferred embodiment of the lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong described in this invention, the connector further includes a protrusion and a hexagonal screw. The protrusion is symmetrically arranged at the bottom of the heat dissipation shell, and the top of the heat dissipation shell is symmetrically provided with grooves that cooperate with the protrusion. The gasket is provided with a square hole that cooperates with the groove, so that when two adjacent lithium battery cell hybrid thermal management structures are axially connected in series, the protrusion at the bottom of the upper heat dissipation shell can penetrate the gasket and be inserted into the groove at the top of the lower heat dissipation shell. The side of the groove is provided with a second through hole that cooperates with the hexagonal screw, and the second through hole communicates with the groove. The protrusion is provided with a threaded hole that cooperates with the hexagonal screw. Two adjacent heat dissipation shells are fixedly connected by the protrusion, the groove and the hexagonal screw to improve the reliability and sealing of the axial series connection between two adjacent lithium battery cell hybrid thermal management structures.

[0010] As a preferred embodiment of the hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong described in this invention, the heat dissipation component includes convex fins and concave fins, which are distributed on the front and rear sides and the left and right sides of the heat dissipation shell, respectively. The metal fins are used as the battery shell to enhance the heat conduction to the lithium battery cell, which significantly improves the heat conduction efficiency between the lithium battery cell and the heat dissipation medium. The positions of the convex fins on the front and rear sides and the left and right sides are corresponding. Two adjacent hybrid thermal management structures for lithium battery cells are connected in a radial series through the convex fins and concave fins to form an air duct, so that the external air can carry away the heat emitted by the fins through the air duct to achieve the effect of passive air cooling.

[0011] As a preferred embodiment of the hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong described in this invention, the pagoda-shaped dual connector adopts a gradient structure of multi-stage coaxial frustum cones. The pagoda-shaped dual connector and the liquid flow channel are interference-fitted. On the one hand, the guiding taper effect of the conical surface of the pagoda-shaped dual connector can be used to achieve rapid insertion and assembly, significantly improving the ease of operation and assembly efficiency of connecting the liquid flow channels of two adjacent radial lithium battery cell hybrid thermal management structures. On the other hand, the conical surface of the pagoda-shaped dual connector and the inner wall of the inlet and outlet of the liquid flow channel form a self-tightening seal through interference contact. The contact stress generated by the structural interference effectively blocks the leakage path of the coolant medium, improving the reliability of the seal.

[0012] As a preferred embodiment of the hybrid thermal management structure of lithium battery core based on the morphological characteristics of jade cong described in this invention, the gap between the mating surface of the gasket and the liquid flow channel is filled with anaerobic sealant, so that the sealant can be rapidly cured in the closed gap formed by subsequent assembly with the help of the oxygen-deficient environment, and form a composite sealing system in synergy with the mechanical seal structure, which significantly improves the reliability of interface sealing.

[0013] As a preferred embodiment of the hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong described in this invention, the gasket is made of rubber elastic material. On the one hand, the gasket can seal the liquid flow channel interface through its own elastic deformation. On the other hand, it can also provide buffering and shock absorption for the axially connected hybrid thermal management structure for lithium battery cells, reducing the risk of short circuit in the PACK battery pack caused by coolant leakage, thereby improving the reliability and sealing durability of the overall structure of the PACK battery pack.

[0014] The beneficial effects of this invention are: 1. By cooperating with each other, the heat dissipation shell, liquid cooling components and heat dissipation parts not only improve the heat dissipation efficiency of the lithium battery core and optimize the overall temperature uniformity of the lithium battery, but also facilitate the series and parallel connection between lithium battery cores to meet the system's requirements for high energy density and large capacity power output. 2. The structure adopts a spliced ​​thermal management shell, and its outer surface adopts a concave-convex dovetail groove metal fin design. By expanding the heat transfer area, the convective heat transfer efficiency is significantly enhanced. The shell also has the characteristics of structural and functional integration: its axially distributed fins have standardized concave-convex dovetail groove interfaces, which support the modular stacking and splicing of multiple cells, realizing flexible expansion from single shell to customized PACK battery pack, meeting the power or capacity gradient requirements of different electrical devices. This makes the hybrid thermal management structure of lithium battery cells suitable for the needs of multiple scenarios and has good economic benefits. 3. The outer shell is designed with circular liquid channels around its perimeter, which together with the fins form a composite heat dissipation system. At the same time, the cross-cooling channel design of liquid cooling and passive air cooling greatly improves the heat exchange efficiency. When the liquid channels are axially connected in series, the double-joint socket in the gasket ensures the sealing of the liquid channels during operation and avoids leakage of liquid medium. 4. By optimizing the hybrid thermal management structure of the lithium battery core, we have achieved simplified assembly, improved multi-platform compatibility, reduced economic costs, and the thermal field coupling design of fins, liquid flow channels and passive air cooling effectively improves the uniformity of internal temperature distribution of lithium battery, suppresses the generation of local hot spots, thereby extending the cycle life of lithium battery core and improving the safety of the entire life cycle. 5. It adopts a composite heat dissipation structure design, which combines finned heat transfer with forced convection and passive air cooling to achieve multi-path, high-intensity heat exchange capacity, thereby effectively improving the overall heat dissipation performance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of a hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong.

[0016] Figure 2 This is a schematic diagram of the liquid flow channel location structure of a hybrid thermal management structure for lithium battery cells based on the morphological characteristics of jade cong.

[0017] Figure 3 This is a schematic diagram of a hybrid thermal management structure for two lithium battery cells connected in series axially.

[0018] Figure 4 This is an assembly diagram of the grooves, bumps, and hexagonal screws of a lithium battery core hybrid thermal management structure based on the morphological characteristics of jade cong.

[0019] Figure 5 This is a schematic diagram of a radially connected thermal management structure for two lithium battery cells.

[0020] In the diagram: 1. Heat dissipation shell; 2. Lithium battery core; 3. Liquid flow channel; 4. Convex fins; 5. Concave fins; 6. Groove; 7. Protrusion; 8. Hexagonal screw; 9. Washer; 10. Pagoda double connector; 11. First through hole; 12. Square hole; 13. Second through hole; 14. Threaded hole. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments. Example

[0024] Reference Figures 1-5 This embodiment provides a hybrid thermal management structure for lithium battery core 2 based on the morphological characteristics of a jade cong, applied to the thermal management of lithium battery core 2. It includes a heat dissipation shell 1, a liquid cooling assembly, and a heat sink. The heat dissipation shell 1 has a "jade cong" structure with an outer square and an inner circle. The lithium battery core 2 is disposed in the circular hole of the heat dissipation shell 1. The liquid cooling assembly is disposed on the heat dissipation shell 1 for liquid cooling and axial series connection of the lithium battery core 2. The heat sink is disposed on the outer surface of the heat dissipation shell 1 for passive air cooling and radial series connection of the lithium battery core 2.

[0025] The heat dissipation shell 1 has an overall "jade cong" structure with a square outer edge and a round inner edge. It serves as the foundation of the entire hybrid thermal management structure of the lithium battery core 2, housing and fixing the lithium battery core 2 and efficiently transferring the heat generated during operation to the metal shell through the high thermal conductivity of the metal. It also provides a carrier for the installation of metal fins and a flow channel carrier for the liquid cooling assembly. The lithium battery core 2 is installed in the circular hole in the middle of the heat dissipation shell 1, serving as a power supply. A liquid cooling assembly is installed on the heat dissipation shell 1. This assembly not only achieves liquid cooling of the lithium battery core 2 inside the heat dissipation shell 1, but also enables… The axial series connection of the hybrid thermal management structure of two adjacent lithium battery cells 2 is achieved. Heat sinks are installed on the outer surface of the heat dissipation shell 1. The heat sinks not only enable passive air cooling of the lithium battery cells 2 inside the heat dissipation shell 1, but also facilitate the radial series connection of the hybrid thermal management structure of two adjacent lithium battery cells 2. In this embodiment, the heat dissipation shell 1, liquid cooling components and heat sinks cooperate with each other to improve the heat dissipation efficiency of the lithium battery cells 2, optimize the uniformity of the overall temperature of the lithium battery, and facilitate the series and parallel connection between the lithium battery cells 2 to meet the system's requirements for high energy density and large capacity power output.

[0026] Specifically, the liquid cooling component includes liquid channels 3 and connectors. The liquid channels 3 are distributed at the four corners inside the heat dissipation shell 1. The hybrid thermal management structure of two adjacent lithium battery cells 2 is connected in series axially through the connectors.

[0027] The liquid cooling assembly in this embodiment mainly consists of four liquid channels 3 and connectors. The four liquid channels 3 are distributed at the four apex corners inside the heat dissipation shell 1 and are arranged symmetrically. They are used to exchange heat generated by the lithium battery core 2. The heat conducted by the heat dissipation shell 1 is efficiently removed by the liquid medium with a high convective heat transfer coefficient, so that the lithium battery is in the optimal operating temperature range and the battery temperature is uniform. In this embodiment, the coolant is an aqueous solution of ethylene glycol. Connectors are installed at the position of the heat dissipation shell 1 near the liquid channels 3. The mixed thermal management structure of two adjacent lithium battery cores 2 is connected in series axially through the connectors so as to realize the axial series connection between two adjacent lithium battery cores 2.

[0028] Specifically, the connector includes a gasket 9 and a pagoda-shaped double connector 10. The gasket 9 is disposed between two adjacent axially connected heat dissipation shells 1. The gasket 9 is provided with a first through hole 11 that mates with the liquid flow channel 3. The two adjacent axially connected liquid flow channels 3 are connected by the pagoda-shaped double connector 10, which passes through the first through hole 11 on the gasket 9.

[0029] In this embodiment, the connector mainly consists of a gasket 9 and four pagoda-shaped double connectors 10. The gasket 9 has an overall square outer and round inner structure that matches the heat dissipation shell, and the four corners are rounded. At the four top corners of the gasket 9, there are first through holes 11 that match the liquid flow channels 3, so that the pagoda-shaped double connectors 10 can pass through the gasket 9. When connected in series, the gasket 9 is installed between the contact surfaces of two adjacent axially connected heat dissipation shells 1. One end of the four pagoda-shaped double connectors 10 passes through the first through hole 11 on the gasket 9 and is inserted into the liquid flow channel 3 of one heat dissipation shell 1. The other end of the four pagoda-shaped double connectors 10 is inserted into the liquid flow channel 3 of another heat dissipation shell 1, so as to realize the connection of the liquid flow channels 3 between the hybrid thermal management structures of two adjacent lithium battery cells 2.

[0030] Furthermore, the connector also includes a protrusion 7 and a hexagonal screw 8. The protrusion 7 is symmetrically arranged at the bottom of the heat dissipation shell 1. The top of the heat dissipation shell 1 is symmetrically provided with grooves 6 that mate with the protrusion 7. The gasket 9 is provided with a square hole 12 that mates with the groove 6. The side of the groove 6 is provided with a second through hole 13 that mates with the hexagonal screw 8. The second through hole 13 communicates with the inside of the groove 6. The protrusion 7 is provided with a threaded hole 14 that mates with the hexagonal screw 8. Two adjacent heat dissipation shells 1 are fixedly connected by the protrusion 7, the groove 6 and the hexagonal screw 8.

[0031] In this embodiment, two protrusions 7 are symmetrically fixedly installed at the bottom of the heat dissipation housing 1. The top of the heat dissipation housing 1 has symmetrically formed grooves 6 that mate with the protrusions 7, allowing for precise positioning during the axial series connection of two adjacent lithium battery cells 2 in a hybrid thermal management structure. A square hole 12 mates with the groove 6 is formed on the gasket 9, allowing the protrusion 7 at the bottom of the upper heat dissipation housing 1 to penetrate the gasket 9 and insert into the groove 6 at the top of the lower heat dissipation housing 1 during the axial series connection of two adjacent lithium battery cells 2 in a hybrid thermal management structure. Second through holes 13 mate with hexagonal screws 8 are formed on the sides of the two grooves 6. The second through hole 13 connects to the outside, so that the hexagonal screw 8 can pass through the second through hole 13 and be fixedly connected to the protrusion 7. The protrusion 7 is provided with a threaded hole 14 that mates with the hexagonal screw 8, so that the hexagonal screw 8 can fix the protrusion 7 in the groove 6 through the thread. The two adjacent heat dissipation shells 1 are fixedly connected by the protrusion 7, the groove 6 and the hexagonal screw 8 to resist vibration and impact, so as to improve the reliability and sealing of the axial series connection between the two adjacent lithium battery cores 2 hybrid thermal management structures. This allows the lithium battery cores 2 hybrid thermal management structures to form a larger-scale PACK battery pack, and enhances the stability between PACK battery packs.

[0032] Specifically, the heat dissipation components include convex fins 4 and concave fins 5. The convex fins 4 and concave fins 5 are distributed on the front and rear sides and the left and right sides of the heat dissipation shell 1, respectively. The positions of the convex fins 4 and concave fins 5 on the front and rear sides and the left and right sides are corresponding. The hybrid thermal management structure of two adjacent lithium battery cells 2 is connected in a radial series through the convex fins 4 and concave fins 5 to form an air duct.

[0033] In this embodiment, the heat sink mainly consists of six convex fins 4 and six concave fins 5. Three convex fins 4 and three concave fins 5 are distributed on the front and rear sides of the heat sink housing 1, respectively, and the other three convex fins 4 and three concave fins 5 are distributed on the left and right sides of the heat sink housing 1, respectively. All fins are distributed in the middle of the outer surface of the heat sink housing 1 based on the experimentally obtained characteristic that the high temperature generated by the lithium battery core 2 is concentrated in the middle and gradually decreases from the inside to the outside. This increases the effective heat exchange area, allowing for rapid conduction of the heat generated by the lithium battery core 2 during operation and more efficiently maintaining the uniformity of the temperature field of the lithium battery throughout the entire charge-discharge cycle. It should be noted that in this embodiment, the convex fins 4 are all composed of dovetail groove convex interfaces with narrow inner sides and wide outer sides, and the concave fins 5 are all composed of dovetail groove concave interfaces with wide inner sides and narrow outer sides, enabling splicing between adjacent heat sink housings and providing installation conditions for the series and parallel connection of the lithium battery cores 2. Furthermore, the positions of the convex fins 4 and concave fins 5 on the front and rear sides and the left and right sides correspond to each other. This design enables radial series connection between adjacent lithium battery cells 2 and their hybrid thermal management structures, forming an air duct. When passive air cooling is triggered, it also accelerates the convective heat transfer with the air, allowing external air to carry away the heat emitted by the fins through the air duct, thus achieving passive air cooling of the lithium battery cells 2. It should be noted that the fins in this embodiment are all made of high-strength lightweight metal materials, such as aluminum alloy. The adjacent lithium battery cells 2 and their hybrid thermal management structures are mechanically interlocked through high-strength lightweight metal materials such as aluminum alloy. This connection structure adopts a precision clearance fit, and the wedge structure of the dovetail groove provides axial positioning and radial clamping force, which helps to improve the structural integrity of the entire radial connection structure under the coupling conditions of mechanical stress and thermal stress. At the same time, the tight fit between the concave fins 5 and the convex fins 4 also helps to enhance the overall heat conduction efficiency, improve the temperature uniformity and thermal runaway suppression capability of the hybrid thermal management structure of the lithium battery cells 2, thereby meeting the high reliability and long life operation requirements of high-power electrical equipment for the power system.

[0034] Furthermore, the pagoda-shaped double connector 10 adopts a gradient structure of multi-stage coaxial truncated cones, and the pagoda-shaped double connector 10 and the liquid flow channel 3 are interference-fitted.

[0035] In this embodiment, the pagoda-shaped double connector 10 adopts a gradient structure of multi-stage coaxial frustums of cones. Its overall structure is axially symmetrical, consisting of three coaxial frustums stacked sequentially on the top and bottom, connected by a cylindrical frustum. The center is formed by a circular hole, which is used to axially connect the upper and lower liquid flow channels 3 of the lithium battery core 2. The conical surface of the pagoda-shaped double connector 10 can form an interference fit with the liquid flow channel 3. On the one hand, the guiding taper effect of the conical surface of the pagoda-shaped double connector 10 can be used to achieve rapid insertion and assembly, significantly improving the ease of operation and assembly efficiency of connecting the liquid flow channels 3 of the hybrid thermal management structure of two adjacent radial lithium battery cores 2. On the other hand, the conical surface of the pagoda-shaped double connector 10 and the inner wall of the inlet and outlet of the liquid flow channel 3 form a self-tightening seal through interference contact. The contact stress generated by the structural interference effectively blocks the leakage path of the coolant medium, improving the reliability of the seal.

[0036] Furthermore, the gap between the mating surfaces of the gasket 9 and the liquid flow channel 3 is filled with anaerobic sealant.

[0037] When two adjacent heat dissipation shells 1 are connected in a radial series, this embodiment fills the gap between the mating surfaces of the gasket 9 and the liquid flow channel 3 with anaerobic sealant, so that the sealant can be quickly cured in the closed gap formed by subsequent assembly with the help of the oxygen-deficient environment. It works together with the mechanical seal structure formed by the pagoda double connector 10 to form a composite seal structure, which significantly improves the reliability of the seal between the liquid flow channels 3 on the two adjacent heat dissipation shells 1.

[0038] Furthermore, gasket 9 is made of elastic rubber material.

[0039] In this embodiment, the gasket 9 is made of rubber elastic material. On the one hand, the gasket 9 can seal the interface of the liquid flow channel 3 through its own elastic deformation, thereby improving the reliability of the seal between the liquid flow channels 3 on the two adjacent heat dissipation shells 1. On the other hand, it can also provide buffering and shock absorption for the hybrid thermal management structure of the axially connected lithium battery core 2, reducing the risk of short circuit of the PACK battery pack caused by coolant leakage, thereby improving the reliability and sealing durability of the overall structure of the PACK battery pack.

[0040] When the lithium battery cells 2 need to be connected in series axially, firstly, anaerobic sealant is evenly applied to both sides of the gasket 9. The gasket 9 is then precisely aligned with the liquid flow channel 3 on the heat dissipation shell 1 of the upper and lower lithium battery cells 2 through its four sets of first through holes 11, ensuring that their axes coincide. Then, the pagoda-shaped double connector 10 is correspondingly embedded in the four first through holes 11 of the gasket 9. It is necessary to ensure that the cylindrical reference surface of the pagoda-shaped double connector 10 is flush with the assembly plane of the gasket 9, so as to provide a unified planar reference for the flow channel docking. Finally, the upper part of the pagoda-shaped double connector 10 is inserted and assembled into the liquid flow channel on the upper heat dissipation shell 1. Within 3, by controlling the insertion depth, ensure that the end face of the liquid flow channel 3 and the sealing surface of the gasket 9 achieve tight surface contact, initially forming a sealing interface. Then, using the same docking method, dock the liquid flow channel 3 on the heat dissipation shell 1 of the lower lithium battery core 2 hybrid thermal management structure with the lower part of the pagoda double connector 10 in the gasket 9. After completing the connection of the liquid flow channel 3 of the upper and lower lithium battery core 2 hybrid thermal management structures, the protrusion 7 at the bottom of the upper heat dissipation shell 1 will be precisely inserted into the groove 6 at the top of the lower heat dissipation shell 1. Finally, fix the hexagonal screw 8 through the second through hole 13 on the groove 6 into the threaded hole 14 on the protrusion 7.

[0041] When the lithium battery core 2 needs to be connected in radial series, the two lithium battery cores 2 are arranged in a coaxial parallel manner to ensure the consistency of the symmetrical structure of the two. That is, the concave fin 5 on the right side of the left heat dissipation shell 1 corresponds to the convex fin 4 on the left side of the right heat dissipation shell 1. Then, the convex fin 4 on the right heat dissipation shell 1 is inserted into the concave fin 5 on the left heat dissipation shell 1.

[0042] During the charging and discharging process of the lithium battery cell 2, due to the internal electrochemical reaction and ohmic impedance, the lithium battery cell 2 continuously generates a large amount of heat. The heat is first conducted from the inside of the lithium battery cell 2 to the external heat dissipation shell 1. Liquid channels 3 are arranged around the heat dissipation shell 1. Ethylene glycol aqueous solution flows from top to bottom along the axial direction of the lithium battery cell 2 through the surrounding liquid channels 3, continuously carrying away the heat of the lithium battery cell 2 and the heat dissipation shell 1 through convection heat transfer. At the same time, radially distributed fins are installed on the outer surface of the heat dissipation shell 1 to increase the contact area with the air. The fins further transfer heat to their outer surface through heat conduction and undergo natural convection heat transfer with the surrounding air. When the electric vehicle is in motion, the strong convective airflow from the outside is introduced into the PACK battery pack through the guide holes. The forced convection effect will significantly enhance the heat dissipation capacity of the fins, triggering passive air cooling of the lithium battery cell 2, further improving the overall heat dissipation efficiency, thereby ensuring the operating temperature and internal temperature uniformity of the lithium battery cell 2.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hybrid thermal management structure for lithium battery cores based on the morphological characteristics of jade cong, applied to the thermal management of lithium battery cores (2), characterized in that: It includes a heat dissipation shell (1), a liquid cooling assembly and a heat dissipation component. The heat dissipation shell (1) has a "jade cong" structure with a square outer shape and a round inner shape. The lithium battery core (2) is disposed in the round hole of the heat dissipation shell (1). The liquid cooling assembly is disposed on the heat dissipation shell (1) for liquid cooling and axial series connection of the lithium battery core. The heat dissipation component is disposed on the outer surface of the heat dissipation shell (1) for passive air cooling and radial series connection of the lithium battery core.

2. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 1, characterized in that: The liquid cooling assembly includes a liquid flow channel (3) and a connector. The liquid flow channel (3) is distributed at the four corners inside the heat dissipation shell (1). The hybrid thermal management structures of two adjacent lithium battery cells (2) are connected in series axially through the connector.

3. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 2, characterized in that: The connector includes a gasket (9) and a pagoda double connector (10). The gasket (9) is disposed between two adjacent axially connected heat dissipation shells (1). The gasket (9) has a first through hole (11) that matches the liquid flow channel (3). Two adjacent axially connected liquid flow channels (3) are connected by the pagoda double connector (10). The pagoda double connector (10) passes through the first through hole (11) on the gasket (9).

4. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 3, characterized in that: The connector also includes a protrusion (7) and a hexagonal screw (8). The protrusion (7) is symmetrically arranged at the bottom of the heat dissipation shell (1). The top of the heat dissipation shell (1) is symmetrically provided with a groove (6) that matches the protrusion (7). The gasket (9) is provided with a square hole (12) that matches the groove (6). The side of the groove (6) is provided with a second through hole (13) that matches the hexagonal screw (8). The second through hole (13) is connected to the groove (6). The protrusion (7) is provided with a threaded hole (14) that matches the hexagonal screw (8). Two adjacent heat dissipation shells (1) are fixedly connected by the protrusion (7), the groove (6) and the hexagonal screw (8).

5. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 1, characterized in that: The heat dissipation component includes convex fins (4) and concave fins (5). The convex fins (4) and concave fins (5) are distributed on the front and rear sides and the left and right sides of the heat dissipation shell (1), respectively. The positions of the convex fins (4) and concave fins (5) on the front and rear sides and the left and right sides are corresponding. The hybrid thermal management structure of two adjacent lithium battery cells (2) is connected in a radial series through the convex fins (4) and concave fins (5) to form an air duct.

6. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 3, characterized in that: The pagoda double connector (10) adopts a gradient structure of multi-stage coaxial truncated cones, and the pagoda double connector (10) and the liquid flow channel (3) are interference fit.

7. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 6, characterized in that: The gap between the mating surfaces of the gasket (9) and the liquid flow channel (3) is filled with anaerobic sealant.

8. The lithium battery cell hybrid thermal management structure based on the morphological characteristics of jade cong as described in claim 3, characterized in that: The gasket (9) is made of rubber elastic material.

Images