Heat dissipation system for solid-state battery module

Abstract

The application relates to a heat dissipation system of a solid-state battery module, which comprises a solid-state battery group formed by sequentially connecting a plurality of solid-state batteries, a phase change material layer and a thin aluminum heat plate. The phase change material layer is attached to the surface of each solid-state battery and is used for absorbing heat generated by charging and discharging of the solid-state battery. The thin aluminum heat plate wraps the solid-state batteries in the solid-state battery group in the form of a paperclip ring, and is used for forming a heat conduction path among the plurality of solid-state batteries and uniformly distributing the heat generated by the solid-state batteries in the heat conduction path. The application can improve the heat dissipation efficiency and heat uniformity of the solid-state battery group.

Description

Technical Field

[0001] This application relates to the field of solid-state battery technology, and in particular to a heat dissipation system for a solid-state battery module. Background Technology

[0002] With the rapid development of solid-state battery and small power device technologies, solid-state batteries, with their advantages of high energy density and high safety, have been widely used in fields with stringent weight and space requirements, such as drones and portable electronic devices. However, because solid-state batteries generally employ a high-nickel cathode and silicon-carbon anode system, they are prone to generating a large amount of heat during high-rate charge and discharge processes, accompanied by battery expansion. This can lead to problems such as excessive temperature rise and uneven temperature distribution within the battery module, severely impacting battery life and safety performance. Therefore, efficient and lightweight thermal management of solid-state battery modules has become a key research focus in this field.

[0003] Currently, traditional thermal management methods for solid-state battery modules mainly involve liquid cooling or immersion cooling, which achieves heat dissipation and heat equalization through large-area contact between the coolant and the module. However, these traditional thermal management methods suffer from low heat dissipation efficiency and poor heat equalization. Summary of the Invention

[0004] Therefore, it is necessary to provide a heat dissipation system for solid-state battery modules that can improve heat dissipation efficiency and heat distribution, in order to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a heat dissipation system for a solid-state battery module, comprising: a solid-state battery pack formed by connecting multiple solid-state batteries in series, a phase change material layer, and a thin aluminum heat sink.

[0006] A phase change material layer is attached to the surface of each solid-state battery to absorb the heat generated during charging and discharging.

[0007] A thin aluminum heat spreader is wrapped around the solid-state battery in the solid-state battery pack in a paperclip manner to form a heat conduction path between multiple solid-state batteries, so as to evenly distribute the heat generated by the solid-state battery in the heat conduction path.

[0008] In one embodiment, the system further includes a gradient temperature sampling component;

[0009] A gradient temperature sampling component is placed on the solid-state battery to measure its temperature.

[0010] In one embodiment, the gradient temperature sampling component includes: a plurality of thermocouples;

[0011] Multiple thermocouples are arranged sequentially between adjacent solid-state batteries and at the outermost solid-state battery on one side of the solid-state battery pack, starting from the two solid-state batteries at the center of the solid-state battery pack.

[0012] In one embodiment, thermocouples are arranged at the center point of the contact surfaces of two adjacent solid-state batteries and at the center point of the outermost solid-state battery on the other side of the contact surface.

[0013] In one embodiment, a thin aluminum heat spreader is used to wrap around three solid-state batteries in groups, forming a segmented paperclip heat spreader structure.

[0014] In one embodiment, the system further includes a simulation module; the simulation module includes a pre-built solid-state battery pack model.

[0015] In one embodiment, the simulation module is further configured to:

[0016] In response to the various material settings of the solid-state battery pack model by the staff, various thermal conductivity coefficients of the solid-state battery pack model were determined.

[0017] In one embodiment, the material arrangement includes: air, aluminum sheet, and carbon-coated copper foil.

[0018] In one embodiment, the simulation module is further configured to:

[0019] Based on various thermal conductivity coefficients, the corresponding temperature difference for various material settings is determined; the temperature difference is the temperature of the outermost solid-state battery in the solid-state battery pack minus the temperature of the two adjacent solid-state batteries in the middle of the solid-state battery pack.

[0020] In one embodiment, the simulation module is further configured to:

[0021] Comparative results were generated based on the temperature differences corresponding to various material settings and the temperature differences corresponding to the solid-state battery pack wrapped with a thin aluminum heat sink in a paperclip manner.

[0022] The aforementioned heat dissipation system for the solid-state battery module includes: a solid-state battery pack formed by multiple solid-state batteries connected in series, a phase change material layer, and a thin aluminum heat sink. The phase change material layer is attached to the surface of each solid-state battery to absorb the heat generated during charging and discharging. The thin aluminum heat sink wraps around the solid-state batteries in the solid-state battery pack in a paperclip-like manner to form a heat conduction path between the multiple solid-state batteries, uniformly distributing the heat generated by the solid-state batteries within the heat conduction path. This application, through a structural design combining phase change material heat absorption and a thin aluminum heat sink, can significantly improve the temperature uniformity of the solid-state battery pack while achieving efficient heat dissipation, reducing the internal temperature gradient of the module, and avoiding battery aging and thermal safety risks caused by localized overheating. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the heat dissipation system of a solid-state battery module in one embodiment;

[0025] Figure 2 This is a schematic diagram showing the installation position of the thermocouple in one embodiment;

[0026] Figure 3 This is a schematic diagram showing the specific location where the thermocouple is installed in one embodiment. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0029] In one embodiment, such as Figure 1 As shown, a heat dissipation system for a solid-state battery module is provided, including: a solid-state battery pack formed by connecting multiple solid-state batteries 101 in series, a phase change material layer 102, and a thin aluminum heat sink 103.

[0030] A phase change material layer 102 is attached to the surface of each solid-state battery to absorb the heat generated during charging and discharging.

[0031] Among them, the phase change material layer covers the main heat-generating surface of the solid-state battery, absorbing and storing heat in the form of latent heat, thus suppressing the rapid rise in temperature of the solid-state battery.

[0032] Optionally, there can be up to six solid-state batteries. The phase change material layer can be a composite phase change material, a paraffin-based phase change material, or a graphite-modified phase change material. In addition, the phase change material layer can also have a three-dimensional thermally conductive framework embedded inside, which runs through the phase change material layer to improve the overall thermal conductivity and avoid local overheating.

[0033] The thin aluminum heat spreader 103 wraps around the solid-state battery in the solid-state battery pack in a paperclip manner to form a heat conduction path between multiple solid-state batteries and to evenly distribute the heat generated by the solid-state battery in the heat conduction path.

[0034] The thin aluminum heat spreader is an ultra-thin, high thermal conductivity pure aluminum sheet or aluminum alloy sheet. It is attached to the outside of the solid-state battery pack in the form of paper clips and segmented wrapping, connecting multiple solid-state batteries in series to form a continuous heat conduction path. This is used to quickly equalize the temperature between solid-state batteries and to uniformly conduct and diffuse the heat generated by the solid-state batteries.

[0035] The aforementioned heat dissipation system for the solid-state battery module includes: a solid-state battery pack formed by multiple solid-state batteries connected in series, a phase change material layer, and a thin aluminum heat sink. The phase change material layer is attached to the surface of each solid-state battery to absorb the heat generated during charging and discharging. The thin aluminum heat sink wraps around the solid-state batteries in the solid-state battery pack in a paperclip-like manner to form a heat conduction path between the multiple solid-state batteries, uniformly distributing the heat generated by the solid-state batteries within the heat conduction path. This application, through a structural design combining phase change material heat absorption and a thin aluminum heat sink, can significantly improve the temperature uniformity of the solid-state battery pack while achieving efficient heat dissipation, reducing the internal temperature gradient of the module, and avoiding battery aging and thermal safety risks caused by localized overheating.

[0036] In one exemplary embodiment, the system further includes: a gradient temperature sampling component;

[0037] A gradient temperature sampling component is placed on the solid-state battery to measure its temperature.

[0038] For example, a gradient temperature sampling component is arranged on the solid-state battery to collect temperature data at different locations of the solid-state battery pack during charging and discharging, so as to obtain the temperature gradient and temperature difference distribution inside the module.

[0039] In this embodiment, by collecting temperature data at multiple locations, the internal thermal distribution of the module can be accurately reflected, avoiding the evaluation bias caused by monitoring only a single point of temperature.

[0040] In one exemplary embodiment, such as Figure 2 As shown, the gradient temperature sampling component includes: multiple thermocouples;

[0041] Multiple thermocouples are arranged sequentially between adjacent solid-state batteries and at the outermost solid-state battery on one side of the solid-state battery pack, starting from the two solid-state batteries at the center of the solid-state battery pack.

[0042] For example, multiple thermocouples start between two solid-state cells at the center of the solid-state battery pack ( Figure 2 From the center position of the solid-state battery pack to the outermost solid-state battery on one side, they are arranged sequentially between two adjacent solid-state batteries. Figure 2 The sub-center position, sub-surface and surface) and the outermost solid-state battery ( Figure 2 (the surface in the middle).

[0043] In this embodiment, by deploying the module in a gradient manner from the inside out, the temperature change trend of the module from the inside out can be fully captured, and the temperature gradient data can be accurately obtained.

[0044] In one exemplary embodiment, such as Figure 3 As shown, thermocouples are arranged at the center point of the contact surfaces of two adjacent solid-state batteries and at the center point of the outermost solid-state battery on the other side of the contact surface.

[0045] For example, thermocouples are attached to the geometric center of the contact surfaces of two adjacent solid-state batteries and the other side of the outermost solid-state battery relative to the contact surface.

[0046] In this embodiment, by placing the thermocouple at the center, the accuracy of temperature acquisition can be improved, the internal temperature difference of the module can be accurately reflected, and reliable data can be provided for thermal management optimization.

[0047] In one exemplary embodiment, a thin aluminum heat spreader is used to wrap around three solid-state batteries in groups, forming a segmented paperclip heat spreader structure.

[0048] For example, a thin aluminum heat spreader is wrapped around three solid-state batteries in a group, forming a segmented paperclip heat spreader structure that divides the solid-state battery pack consisting of six solid-state batteries into at least two heat spreader units.

[0049] In this embodiment, the segmented wrapping design enhances the thermal conductivity between battery cells, reduces the internal temperature difference of the module, and improves thermal management without increasing structural weight and volume.

[0050] In one exemplary embodiment, the system further includes a simulation module; the simulation module includes a pre-built solid-state battery pack model.

[0051] For example, the process of establishing a solid-state battery pack model includes: constructing a scaled-down three-dimensional geometric model based on the actual size of the solid-state battery module, the solid-state battery arrangement structure, and the assembly relationship; secondly, relying on the Fluent simulation platform and equipped with NTGK (Newman-Tiedemann-Gu-Kim, a simplified semi-empirical electrochemical model), using the OCV (Open Circuit Voltage) characteristic curve of the solid-state battery as the core input parameter, and completing the fitting and calibration of electrochemical parameters; finally, combining the CFD (Computational Fluid Dynamics) heat transfer simulation principle, constructing an electrochemical-thermal coupling simulation model of the solid-state battery pack.

[0052] In this embodiment, by using the NTGK semi-empirical model to replace the traditional P2D (Pseudo-Two-Dimensional) model, there is no need to input a large number of battery microscopic material parameters. Modeling can be completed solely based on the OCV characteristic curve, which greatly simplifies the modeling process, shortens the simulation iteration cycle, and enables rapid simulation and comparative analysis of the thermal performance of different heat dissipation and heat evaporation structures.

[0053] In one exemplary embodiment, the simulation module is further configured to:

[0054] In response to the various material settings of the solid-state battery pack model by the staff, various thermal conductivity coefficients of the solid-state battery pack model were determined.

[0055] For example, in response to the material settings made by the staff in the simulation model based on the properties of various materials, the thermal conductivity of the solid-state battery pack model is modified according to the inherent thermal properties of different materials.

[0056] In this embodiment, by quantitatively extracting the thermal conductivity of different material settings, the heat transfer capacity of various thermally conductive materials can be accurately distinguished, providing quantitative data basis for subsequent heat dissipation performance comparison.

[0057] In one exemplary embodiment, the material setup includes: air, aluminum sheet, and carbon-coated copper foil.

[0058] For example, air, aluminum sheet, and carbon-coated copper foil correspond to the conventional air gap heat dissipation scheme, the thin aluminum heat sink heat dissipation scheme, and the carbon-coated copper foil heat sink heat dissipation scheme, respectively.

[0059] In this embodiment, by setting multiple gradient thermal conductive material conditions, it is possible to achieve a horizontal comparison of different heat dissipation structures, enrich the simulation comparison dimensions, and improve the comprehensiveness of heat dissipation scheme optimization.

[0060] In one exemplary embodiment, the simulation module is further configured to:

[0061] Based on various thermal conductivity coefficients, the corresponding temperature difference for various material settings is determined; the temperature difference is the temperature of the outermost solid-state battery in the solid-state battery pack minus the temperature of the two adjacent solid-state batteries in the middle of the solid-state battery pack.

[0062] For example, by collecting the real-time simulated temperatures of the high-temperature region at the center of the solid-state battery pack and the low-temperature region around the solid-state battery pack, the actual temperature difference (absolute value) between the inner and outer batteries of the solid-state battery pack can be calculated, thereby characterizing the temperature gradient uniformity of the battery module.

[0063] In this embodiment, by quantifying the temperature difference between the center and the periphery of the module, the heat dissipation effect of different materials can be intuitively evaluated, and the optimal heat conduction structure scheme suitable for solid-state battery modules can be accurately selected.

[0064] In one exemplary embodiment, the simulation module is further configured to:

[0065] Comparative results were generated based on the temperature differences corresponding to various material settings and the temperature differences corresponding to the solid-state battery pack wrapped with a thin aluminum heat sink in a paperclip manner.

[0066] For example, the module temperature difference data corresponding to conventional materials such as air, aluminum sheet, and carbon-coated copper foil are compared and integrated with the module temperature difference data of the segmented paperclip-shaped thin aluminum heat sink structure of this application to generate a visualized and data-driven comparison result of heat dissipation effect.

[0067] In this embodiment, through intelligent comparative analysis of temperature difference data under multiple operating conditions, the advantages of the paperclip-type thin aluminum heat sink structure of this application in reducing module temperature gradient and balancing cell temperature can be intuitively highlighted, the superiority of this heat dissipation system can be quickly verified, and reliable data support can be provided for the optimized design and engineering application of heat dissipation structure of solid-state battery modules.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0069] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A heat dissipation system for a solid-state battery module, characterized in that, The system includes: a solid-state battery pack formed by connecting multiple solid-state batteries in series, a phase change material layer, and a thin aluminum heat sink. The phase change material layer is attached to the surface of each solid-state battery to absorb the heat generated during the charging and discharging of the solid-state battery. The thin aluminum heat spreader wraps around the solid-state batteries in the solid-state battery pack in a paperclip-like manner to form a heat conduction path between multiple solid-state batteries, and to evenly distribute the heat generated by the solid-state batteries in the heat conduction path.

2. The system according to claim 1, characterized in that, The system also includes: a gradient temperature sampling component; The gradient temperature sampling component is arranged on the solid-state battery and is used to measure the temperature of the solid-state battery.

3. The system according to claim 2, characterized in that, The gradient temperature sampling component includes: multiple thermocouples; The multiple thermocouples are arranged sequentially between two adjacent solid-state batteries and to the outermost solid-state battery on one side of the solid-state battery pack, starting from the space between the two solid-state batteries at the center of the solid-state battery pack.

4. The system according to claim 3, characterized in that, The thermocouples are arranged at the center point of the contact surfaces of two adjacent solid-state batteries and at the center point of the outermost solid-state battery on the other side of the contact surface.

5. The system according to claim 1, characterized in that, The thin aluminum heat spreader is wrapped around each group of three solid-state batteries to form a segmented paperclip heat spreader structure.

6. The system according to claim 1, characterized in that, The system also includes a simulation module; the simulation module includes a pre-established solid-state battery pack model.

7. The system according to claim 6, characterized in that, The simulation module is also used for: In response to the various material settings of the solid-state battery pack model by the staff, various thermal conductivity coefficients of the solid-state battery pack model are determined.

8. The system according to claim 7, characterized in that, The material configuration includes: air, aluminum sheet, and carbon-coated copper foil.

9. The system according to claim 7, characterized in that, The simulation module is also used for: Based on the various thermal conductivity coefficients, the corresponding temperature difference for various material settings is determined; the temperature difference is the temperature of the outermost solid-state battery in the solid-state battery pack minus the temperature of the two adjacent solid-state batteries in the middle of the solid-state battery pack.

10. The system according to claim 9, characterized in that, The simulation module is also used for: Comparative results were generated based on the temperature differences corresponding to various material settings and the temperature differences corresponding to the solid-state battery pack wrapped with a thin aluminum heat sink in a paperclip manner.

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