Novel battery module thermal management system

Abstract

The utility model provides a novel battery module thermal management system. The novel battery module thermal management system comprises a plurality of groups of battery modules, a composite phase change material module and a liquid cooling plate module, the liquid cooling plate module comprises a plurality of transverse parts and a plurality of longitudinal parts, a plurality of mounting cavities are formed in the liquid cooling plate module, the liquid cooling plate module is arranged on the outer side of the battery module in a surrounding manner, the composite phase change material module is arranged between the two battery cells in the same group, and the composite phase change material module is in contact with the battery cells; a large amount of heat is absorbed through huge phase change latent heat when the physical state of the vehicle changes, the better heat dissipation effect is achieved, the phase change latent heat is large, a large amount of heat can be absorbed only through a small amount of phase change materials, the absorbed heat can be transmitted to the liquid cooling plate module on one side at the same time, meanwhile, space is fully utilized through the structure, lightweight design of the vehicle is facilitated, and the cost is reduced. The heat management system adopting liquid cooling and phase change material cooling coupling can greatly improve the heat dissipation efficiency, so that the battery is kept in the optimal performance state, the loss of the battery core is reduced, and the service life of the battery core is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat dissipation, and in particular to a novel battery module thermal management system. Background Art

[0002] Power batteries are a core component of electric vehicles, and temperature is one of the most important factors limiting their performance. Power batteries generate and accumulate significant amounts of heat during operation. If heat is not promptly dissipated, the battery temperature will overheat, severely disrupting the chemical balance within the battery. This, in turn, will reduce the battery's energy density and service life, and in severe cases, even lead to thermal runaway. Existing methods for dissipating heat from power batteries primarily include air cooling, liquid cooling, phase change material cooling, and heat pipe cooling. However, as electric vehicles place increasingly stringent demands on power batteries, these four single methods are no longer sufficient to meet the heat dissipation needs of battery modules.

[0003] In view of this, the applicant filed this application after studying the existing technology. Utility Model Content

[0004] The utility model provides a novel battery module thermal management system, which adopts a coupling method of liquid cooling and phase change material cooling to complement each other to achieve better thermal management effect and reduce the use risk of power batteries.

[0005] In order to solve the above technical problems, the present invention provides a new battery module thermal management system, including multiple groups of battery modules, composite phase change material modules and liquid cooling plate modules; the liquid cooling plate modules include multiple transverse parts and multiple longitudinal parts, and multiple installation cavities are formed in the liquid cooling plate modules, and the installation cavities are formed by connecting two transverse parts and two longitudinal parts; the battery modules are installed at both ends of the installation cavities with two battery cells as a group, and the composite phase change material module is adapted to be filled and installed between the two battery cells in the same group; in the same installation cavity, the side of one battery cell away from the other battery cell is in contact with the cavity wall of the installation cavity. The battery modules are installed by forming multiple installation cavity spaces through the liquid cooling module, which is divided into multiple space units. The contact area between the liquid cooling module and the battery cell is greatly utilized, and the composite phase change material module is combined with the phase change latent heat to alternately absorb heat. The two together produce a heat dissipation effect, greatly improving the heat dissipation efficiency, keeping the battery in the best performance state, reducing the loss of the battery cell, and increasing the service life of the battery cell.

[0006] As a further optimization, both the transverse portion and the longitudinal portion are arranged in a wave shape.

[0007] As a further optimization, the spacing width between adjacent battery cells is the same as the thickness of the liquid cooling module between adjacent mounting cavities.

[0008] As a further optimization, a plurality of water inlets are longitudinally arranged at one end of the liquid cooling plate module, and a plurality of water outlets are correspondingly provided at the other end. A cooling pipe is provided in communication with the water inlet and the water outlet, and coolant flows in the cooling pipe.

[0009] As a further optimization, the cooling pipe includes a transverse pipe located in the transverse part and a longitudinal pipe located in the longitudinal part; the transverse pipe and the longitudinal pipe are arranged in communication.

[0010] As a further optimization, the working fluid of the coolant is ethylene glycol with a volume fraction of 50%.

[0011] As a further optimization, thermal conductive adhesive is provided on the inner side wall of the installation cavity.

[0012] As a further optimization, the composite phase change material includes paraffin and expanded graphite.

[0013] By adopting the above technical solution, the utility model can achieve the following technical effects:

[0014] A new battery module thermal management system provided in the present application includes multiple groups of battery modules, composite phase change material modules and liquid cooling plate modules; the liquid cooling plate module includes multiple transverse parts and multiple longitudinal parts, and multiple installation cavities are formed in the liquid cooling plate module, which are arranged around the outside of the battery module. The composite phase change material module is adapted to be filled and arranged between two battery cells in the same group. The composite phase change material module is in contact with the battery cell, and uses the huge phase change latent heat when its own physical state changes to absorb a large amount of heat to achieve better heat dissipation effect. Moreover, the phase change latent heat is large, and only a small amount of phase change material is needed to absorb a large amount of heat. The absorbed heat can be simultaneously transferred to the liquid cooling plate module on one side. At the same time, the structure makes full use of the space, which is conducive to the lightweight design of the vehicle. The thermal management system that couples liquid cooling and phase change material cooling will greatly improve the heat dissipation efficiency, keep the battery in the best performance state, reduce the loss of the battery cell, and increase the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a new battery module thermal management system of the present utility model;

[0017] Figure 2 This is a structural diagram of the liquid cooling plate module of the utility model;

[0018] Figure 3 This is a schematic structural diagram of the battery module of the utility model;

[0019] Figure 4 This is a schematic structural diagram of the composite phase change material module of the utility model;

[0020] Figure 5 It is a structural diagram of the cooling pipe of the utility model;

[0021] Markings in the figure: 1. Battery module; 2. Composite phase change material module; 3. Liquid cooling plate module; 4. Horizontal part; 5. Longitudinal part; 6. Installation cavity; 7. Battery cell; 8. Water inlet; 9. Water outlet; 10. Cooling pipe; 11. Horizontal pipe; 12. Longitudinal pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Depend on Figures 1 to 5As shown, an embodiment of the present invention provides a new battery module thermal management system, including multiple groups of battery modules 1, composite phase change material modules 2 and liquid cooling plate modules 3; the liquid cooling plate module 3 includes multiple transverse parts 4 in the x-axis direction and multiple longitudinal parts 5 in the y-axis direction, preferably three transverse parts 4 and at least three longitudinal parts 5. The extension length of the transverse part 4 is determined by the number of longitudinal parts 5. In this embodiment, the number of longitudinal parts 5 is five to avoid affecting the cooling effect of the liquid cooling module due to excessive battery modules 1. A plurality of mounting cavities 6 are formed in the liquid cooling plate module 3. The mounting cavity 6 is formed by connecting two transverse parts 4 and two longitudinal parts 5. It is arranged around the outside of the battery module 1, and the mounting cavity 6 is closed in the radial direction. Specifically, in this embodiment, two rows are formed in the longitudinal direction, and each row includes four mounting cavities 6. Among them, the battery module 1 is installed at both ends of the installation cavity 6 with two cylindrical lithium batteries as battery cells 7 as a group, and the composite phase change material module 2 is adapted to be filled and installed between the two battery cells 7 in the same group; in the same installation cavity 6, the side of one battery cell 7 away from the other battery cell 7 is in contact with the cavity wall of the installation cavity. When the battery cell 7 generates heat, the heat is simultaneously transferred to the composite phase change material module 2 and the liquid cooling plate module 3 in contact with one side. Among them, since the composite phase change material conducts heat to the heat generated by the battery cell 7 and melts, when the phase change material reaches the melting point and no longer conducts latent heat, the liquid cooling plate module 3 can continue to dissipate heat to the battery cell 7 and the composite phase change material module 2 at the same time. Preferably, the heat conduction method of the phase change material can make the heat dissipation of the battery cell 7 more uniform, ensuring that there is sufficient contact area for heat conduction between the battery cell 7 and the battery cell 7, so that the heat of the battery cell 7 can be better transferred to the liquid cooling plate on the outside for further cooling.

[0024] Preferably, both the transverse portion 4 and the longitudinal portion 5 are arranged in a wavy shape. Through the wavy arrangement, in this embodiment, the installation cavity 6 in the transverse direction forms an installation space suitable for one battery cell 7, and in the longitudinal direction forms an installation space suitable for two battery cells 7 to be arranged at intervals. The inner wall of the installation cavity 6 has a more suitable curvature for fitting with the battery cell 7, and its contact area can reach 1 / 4 to 1 / 2 of the surface area of ​​the outer wall of the battery cell 7, so as to fully conduct heat dissipation. In addition, the wavy arrangement can greatly increase the surface area of ​​the outer wall of the installation cavity 6, thereby enhancing the heat dissipation capacity of the liquid cooling plate module 3 itself. Among them, in a preferred embodiment, the empty space between the battery cell 7 and the liquid cooling plate module 3 can also be filled with composite phase change material for auxiliary heat conduction and heat dissipation.

[0025] Among them, one end of the liquid cooling plate module 3 is longitudinally arranged with multiple water inlets 8, and the other end is correspondingly provided with multiple water outlets 9. The water inlets 8 and the water outlets 9 are connected to form multiple cooling pipes 10, and coolant flows in the cooling pipes 10. The arrangement direction of the cooling pipes 10 is the same as the axial direction of the battery cells 7. The working fluid of the coolant passing through the cooling pipes 10 is ethylene glycol with a volume fraction of 50%. The working fluid flows into the cooling pipes 10 from the water inlet 8. The outer wall of the cooling pipes 10 passes through each battery cell 7, and heat conducts with the battery cell 7 and cooperates with the composite phase change material module 2 to complete the heat dissipation. After that, it flows out from the water outlet 9 and circulates. In this way, by arranging the cooling pipes 10 with coolant inside the liquid cooling plate module 3, an external evaporative radiator (not shown in the figure) can be connected to enhance the cooling effect.

[0026] Furthermore, the cooling pipe 10 includes a transverse pipe 11 located in the transverse part 4 and a longitudinal pipe 12 located in the longitudinal part 5; the transverse pipe 11 and the longitudinal pipe 12 are connected and arranged, and the coolant is divided into the transverse pipe 11 and the longitudinal pipe 12 respectively when entering the cooling pipe 10 from the water inlet 8, and flows through the transverse pipe 11 and the longitudinal pipe 12 around each installation cavity 6, and finally converges from the water outlet 9 to the external radiator to quickly cool the coolant and then circulate it, thereby cooling the internal battery module 1 and the composite phase change material module 2, and, in this embodiment, there are 5 cooling pipes 10 and they are evenly spaced, and the water inlet 8 and the water outlet 9 are circular, which is convenient for connecting to the external radiator, and the internal cooling pipe 10 is rectangular and has a longer length in the z-axis direction, so that there can be more contact space near the side wall, so that the cooling effect of the coolant passing through is better.

[0027] Preferably, the spacing between adjacent battery cells 7 is the same as the thickness of the liquid cooling module between adjacent mounting cavities 6. Thus, even between adjacent battery cells 7 in adjacent mounting cavities 6, the spacing is the same, which in this embodiment is 3 mm. This allows the thermal management system to maintain good heat dissipation efficiency while making the entire thermal management system more compact and reducing the space required.

[0028] Preferably, thermal conductive glue is provided on the inner wall of the mounting cavity 6, thereby providing a better contact effect between the battery cell 7 and the liquid cooling plate module 3 through the thermal conductive glue, thereby improving the efficiency of heat conduction.

[0029] In a preferred embodiment, the composite phase-change material comprises paraffin wax and expanded graphite, both of which have a high thermal conductivity when combined. The graphite is expanded and then mixed with the paraffin wax. After thorough stirring, the mixture is poured into a mold for curing and forming. Finally, the mold is removed and mechanically processed to achieve the desired shape, ensuring a perfect fit with both the battery cell 7 and the liquid cooling plate module 3. The composite phase-change material module 2 contacts the battery cell 7, utilizing the enormous latent heat of phase change during its physical state change to absorb significant amounts of heat, achieving effective heat dissipation. The high latent heat of phase change allows only a small amount of phase-change material to absorb significant amounts of heat. Furthermore, the structure fully utilizes space, facilitating lightweight vehicle design. Once the composite phase-change material exceeds its melting point, its heat dissipation efficiency diminishes, and the liquid cooling plate module 3 is used to perform the heat dissipation task. This thermal management system, which utilizes both liquid cooling and phase-change material cooling, significantly improves heat dissipation efficiency, maintaining optimal battery performance, while reducing wear and tear on the battery cell 7 and extending its service life.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new battery module thermal management system, characterized in that: It includes multiple groups of battery modules, composite phase change material modules and liquid cooling plate modules; the liquid cooling plate module includes multiple transverse parts and multiple longitudinal parts, and multiple installation cavities are formed in the liquid cooling plate module, and the installation cavity is formed by connecting two transverse parts and two longitudinal parts; the battery module is installed at both ends of the installation cavity with two battery cells as a group, and the composite phase change material module is adapted to be filled and arranged between two battery cells in the same group; in the same installation cavity, the side of one battery cell away from the other battery cell is in contact with the cavity wall of the installation cavity.

2. A new battery module thermal management system according to claim 1, characterized in that , the transverse portion and the longitudinal portion are both arranged in a wave shape.

3. A new battery module thermal management system according to claim 1, characterized in that ,The spacing width between adjacent battery cells is the same as the thickness of the ,liquid cooling module between adjacent mounting cavities.

4. A new battery module thermal management system according to claim 1, characterized in that A plurality of water inlets are longitudinally arranged at one end of the liquid cooling plate module, and a plurality of water outlets are correspondingly arranged at the other end. A cooling pipe is provided to connect the water inlet and the water outlet, and coolant flows in the cooling pipe.

5. A new battery module thermal management system according to claim 4, characterized in that The cooling pipe includes a transverse pipe located in the transverse part and a longitudinal pipe located in the longitudinal part; the transverse pipe and the longitudinal pipe are connected to each other.

6. A new battery module thermal management system according to claim 4, characterized in that The working fluid of the coolant is ethylene glycol with a volume fraction of 50%.

7. A new battery module thermal management system according to claim 1, characterized in that , thermal conductive glue is provided on the inner wall of the installation cavity.

8. A new battery module thermal management system according to claim 1, characterized in that ,The composite phase change material includes paraffin and expanded graphite.

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