Composite heat dissipation pipe, preparation method of reheating heat dissipation pipe and battery module

Abstract

The invention discloses a composite heat dissipation pipe, a preparation method of a reheating heat dissipation pipe and a battery module, and relates to the technical field of battery heat management, the composite heat dissipation pipe is used for heat dissipation of the battery module, the battery module comprises a plurality of battery columns which are arranged at intervals in an array structure, the composite heat dissipation pipe comprises a heat conduction insulation pipe body and organic gel, a heat dissipation cavity is formed in the heat-conducting insulating tube body, and the heat-conducting insulating tube body is accommodated in a mounting space formed by at least two battery columns; and the organic gel is filled in the heat dissipation cavity. The invention aims to improve the heat dissipation efficiency of the battery module.

Description

Technical Field

[0001] This invention relates to the field of battery thermal management technology, and in particular to a composite heat sink, a method for preparing a reheating heat sink, and a battery heat dissipation module. Background Technology

[0002] Cylindrical batteries have been widely used in the electric vehicle field due to their high degree of standardization and good consistency. Currently, most cylindrical battery packs are used by connecting multiple batteries in series and parallel. This results in a large volume and number of batteries in the pack, leading to small gaps between the individual cells and making it difficult to incorporate additional heat dissipation structures.

[0003] Battery cooling typically employs methods such as air cooling, liquid cooling, and natural cooling. During charging and discharging, the internal chemical reactions of a battery are complex and generate heat. This is especially true for devices composed of multiple battery cells, where the close arrangement of these cells can easily lead to heat accumulation in the gaps between them. This causes the temperature to rise rapidly and accumulate in large quantities inside the battery, resulting in an uneven temperature distribution and a decline in battery performance. Consequently, phenomena such as leakage, gas release, and smoke may occur. In severe cases, the battery may even burn violently or explode.

[0004] Furthermore, due to assembly limitations of the module itself, the cylindrical cells occupy most of the battery area when connected in series and parallel. This means that the pre-existing gaps between the cells are minimal, preventing the central part of the battery from receiving effective heat dissipation. Even with the addition of a fan, the battery temperature remains ineffective. When the batteries operate at different temperatures, inconsistencies in the individual cells within the battery module will occur, affecting the battery pack's lifespan and creating safety hazards. Summary of the Invention

[0005] The main objective of this invention is to propose a composite heat pipe and battery module, which aims to improve the heat dissipation efficiency of the battery module.

[0006] To achieve the above objectives, the present invention proposes a composite heat dissipation pipe, wherein the battery module includes a plurality of battery pillars arranged in an array at intervals, characterized in that the composite heat dissipation pipe comprises:

[0007] A thermally conductive and insulating tube, wherein a heat dissipation cavity is formed inside the thermally conductive and insulating tube, and the thermally conductive and insulating tube is housed within an installation space formed by at least two of the battery posts; and

[0008] An organic gel, which fills the heat dissipation cavity.

[0009] In one embodiment, the organic gel is a product obtained by partially drying a PVDF-HFP-based organic gel solution with a mass fraction of 10% to 30% in a vacuum environment.

[0010] In one embodiment, the PVDF-HFP-based organic gel solution is the product obtained by dissolving PVDF-HFP in a mixed solution of dimethylacetamide (DMAC) and acetone, then adding succinate and stirring until homogeneous.

[0011] In one embodiment, the material of the thermally conductive insulating tube is one of ceramic-based thermally conductive insulating material, high thermal conductivity epoxy resin, high thermal conductivity silicone rubber, high thermal conductivity silicone grease, or high thermal conductivity filler.

[0012] In one embodiment, the thickness of the thermally conductive insulating tube is t, where 0.04 mm ≤ t ≤ 0.12 mm.

[0013] The present invention also provides a method for preparing a composite heat dissipation pipe, the method comprising the following steps:

[0014] Preparation of a thermally conductive and insulating tube body;

[0015] Prepare PVDF-HFP based organogel solutions with a mass fraction of 10%–30%.

[0016] The organic gel liquid was poured into the thermally conductive and insulating tube.

[0017] The thermally conductive insulating tube containing the PVDF-HFP-based organic gel liquid is placed in a vacuum environment and heated so that the PVDF-HFP-based organic gel liquid is at least partially dried to transform into an organic gel.

[0018] In one embodiment, the step of preparing the thermally conductive insulating tube includes:

[0019] Prepare a silane coupling agent of a predetermined concentration;

[0020] Aluminum nitride, boron nitride and other powders are added to the silane coupling agent to obtain a first mixture;

[0021] The first mixture is placed in a container and stirred in a water bath at 70°C for a first preset time to obtain the second mixture;

[0022] The second mixture was filtered, dried, ground, and sieved to obtain a solid.

[0023] Weigh out carboxyl-terminated butadiene-acrylonitrile rubber and epoxy resin at a mass ratio of 15:100 and mix them evenly to obtain a third mixture;

[0024] The third mixture is heated in a vacuum environment at 150°C for a second preset time to obtain a fourth mixture;

[0025] The solid, the fourth mixture, and the curing agent are mixed evenly to obtain a thermally conductive and insulating gel liquid.

[0026] The thermally conductive and insulating gel liquid is poured into a mold for curing.

[0027] The present invention also provides a battery module, wherein the battery thermal management device includes:

[0028] Battery plates;

[0029] Multiple battery columns are arranged in an array at intervals on the battery plate, and an installation space is formed between at least two adjacent battery columns.

[0030] A plurality of composite heat dissipation pipes as described in any one of claims 1 to 4, wherein the plurality of composite heat dissipation pipes are arranged in an array at intervals on the battery electrode plate, and each composite heat dissipation pipe is correspondingly housed within one of the installation spaces.

[0031] In one embodiment, the battery plate has a plurality of grooves on the side near the battery post, and each composite heat dissipation tube is inserted into one of the grooves.

[0032] In one embodiment, the composite heat sink has an air vent at one end near the groove that communicates with the heat dissipation cavity;

[0033] The battery electrode plate has gas channels formed inside, which are used to connect multiple grooves.

[0034] In one embodiment, the battery module further includes a sensor disposed on the side of the battery plate away from the battery post, the sensor probe extending into the gas channel, and the sensor being used to detect the temperature in the gas channel or the concentration of organic solvent in the gas channel.

[0035] In this invention, the composite heat dissipation pipe is an integrated structure composed of a thermally conductive insulating pipe and an organic gel. It possesses high thermal conductivity and a high liquid content. The thermally conductive insulating pipe is placed within the installation space formed by at least two of the battery pillars. When the battery module is operating, the heat generated by the battery is conducted to the organic gel within the heat dissipation cavity through direct contact or indirect contact with the thermally conductive insulating pipe via air. The organic gel volatilizes upon heating, carrying away the heat generated by the battery. When significant heat accumulation occurs, a large amount of organic solvent evaporates into the gas flow channel. Sensors detect the temperature and concentration of the gaseous organic solvent in the gas flow channel to understand the safety status of the battery pack and provide early warning of thermal runaway. Because the composite heat dissipation pipe has the advantages of small size and high heat dissipation efficiency, it can be easily inserted into the gaps formed by the various battery pillars without affecting the normal operation of the battery module. In practical applications, multiple composite heat dissipation pipes can be placed between multiple battery pillars to improve the heat dissipation efficiency of the battery module. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a composite heat dissipation pipe according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of an embodiment of the battery module provided by the present invention;

[0039] Figure 3 This is a schematic diagram of another embodiment of the battery module provided by the present invention.

[0040] Explanation of icon numbers:

[0041] 1. Composite heat dissipation pipe; 11. Thermally conductive and insulating pipe body; 12. Organic gel;

[0042] 100. Battery module; 2. Battery column; 3. Battery plate; 31. Gas flow channel.

[0043] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0046] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0047] The present invention proposes a composite heat pipe 1 for heat dissipation of a battery module 100, the battery module 100 including a plurality of battery pillars 2 arranged in an array structure at intervals.

[0048] Please see Figure 1 In one embodiment of the present invention, the composite heat dissipation pipe 1 includes a thermally conductive and insulating pipe body 11 and an organic gel 12. A heat dissipation cavity is formed inside the thermally conductive and insulating pipe body 11, and the thermally conductive and insulating pipe body 11 is housed in an installation space formed by at least two battery pillars 2; the organic gel 12 fills the heat dissipation cavity.

[0049] In this invention, the composite heat dissipation pipe 1 is an integrated structure composed of a thermally conductive insulating pipe and an organic gel 12, possessing high thermal conductivity and high liquid content. The thermally conductive insulating pipe 11 is placed within the installation space formed by at least two battery pillars 2. When the battery module 100 is operating, the heat generated by the battery is conducted to the organic gel 12 within the heat dissipation cavity through direct contact or indirect contact with the thermally conductive insulating pipe 11 via air. The organic gel 12 volatilizes upon heating, carrying away the heat generated by the battery. Because the composite heat dissipation pipe 1 has the advantages of small size and high heat dissipation efficiency, it can be easily inserted into the gaps formed by the battery pillars 2 without affecting the normal operation of the battery module 100. In practical use, multiple composite heat dissipation pipes 1 can be arranged between multiple battery pillars 2 to improve the heat dissipation efficiency of the battery module 100.

[0050] In one embodiment of the present invention, the organic gel 12 is a product obtained by partially drying a PVDF-HFP-based organic gel liquid with a mass fraction of 10% to 30% in a vacuum environment. Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is a copolymer with good chemical stability, electrochemical stability, and mechanical properties. It is commonly used as an electrolyte additive or gel polymer electrolyte in lithium-ion batteries. During preparation, the PVDF-HFP-based organic gel liquid is typically a liquid formed by mixing PVDF-HFP with a suitable solvent (such as carbonate solvents) and other additives. The vacuum drying process helps reduce air bubbles in the gel, improving the uniformity and thermal conductivity of the organic gel 12. The organic gel 12 prepared in the above manner can absorb and transfer heat through a phase change (e.g., from a gel state to a solid state) when heated, thereby achieving effective heat dissipation.

[0051] In one embodiment of the present invention, the PVDF-HFP-based organic gel solution is the product obtained by dissolving PVDF-HFP in a mixed solution of dimethylacetamide (DMAC) and acetone, followed by adding succinate and stirring until homogeneous. Dimethylacetamide (DMAC) and acetone are commonly used organic solvents capable of dissolving PVDF-HFP. The mixing of these two solvents can improve the dissolution efficiency and adjust the physical properties of the final organic gel 12. Succinate is an organic compound often used as a plasticizer or additive to improve the processing performance of polymers and the physical properties of the final product. Through thorough stirring, it is ensured that PVDF-HFP, succinate, and the organic solvent are uniformly mixed to form a stable organic gel solution.

[0052] In one embodiment of the present invention, the material of the thermally conductive insulating tube 11 is one of ceramic-based thermally conductive insulating material, high thermal conductivity epoxy resin, high thermal conductivity silicone rubber, high thermal conductivity silicone grease, or high thermal conductivity filler. These materials all have high thermal conductivity and good electrical insulation properties. For example, ceramic-based thermally conductive insulating material usually has high thermal conductivity and electrical insulation, as well as good chemical stability and high temperature resistance, and can be well used for battery heat dissipation in high temperature environments, especially in applications requiring long-term stable operation. High thermal conductivity insulating material usually refers to powders or particles with high thermal conductivity such as alumina, aluminum nitride, and silicon carbide, which can be mixed with matrix materials (such as resin or rubber) to form composite materials.

[0053] In one embodiment of the present invention, the thickness of the thermally conductive insulating tube 11 is t, where 0.04 mm ≤ t ≤ 0.12 mm. It is known that the thickness t of the tube directly affects its thermal resistance; a thicker tube has higher thermal resistance, thus reducing heat dissipation efficiency, while a thinner tube provides lower thermal resistance and improves heat dissipation efficiency. In this embodiment, t is preferably taken in the range of 0.05 mm to 0.1 mm.

[0054] The present invention also provides a method for preparing a composite heat dissipation pipe 1. In one embodiment of the present invention, the preparation method includes the following steps:

[0055] S1. Prepare the thermally conductive and insulating tube body 11;

[0056] S2. Prepare a PVDF-HFP-based organic gel solution with a mass fraction of 10%–30%;

[0057] S3. Pour the PVDF-HFP-based organic gel liquid into the thermally conductive and insulating tube 11;

[0058] S4. The thermally conductive insulating tube 11 containing the PVDF-HFP-based organic gel liquid is placed in a vacuum environment and heated so that the PVDF-HFP-based organic gel liquid is at least partially dried to transform into organic gel 12.

[0059] In the above embodiments, by preparing a thermally conductive insulating tube 11 and filling it with 10% to 30% by mass of PVDF-HFP-based organic gel liquid, and then vacuum drying part of the liquid to obtain organic gel 12, the present invention achieves the integration of efficient heat dissipation and electrical insulation, significantly improving the heat dissipation performance and safety of the battery module 100, extending the battery's service life, while maintaining the compactness and reliability of the structure.

[0060] In one embodiment of the present invention, step S1 includes:

[0061] S11. Prepare a silane coupling agent of a predetermined concentration;

[0062] S12. Add aluminum nitride powder, boron nitride powder, etc. into silane coupling agent to obtain the first mixture;

[0063] S13. Place the first mixture into a container and stir it in a water bath at 70°C for a first preset time to obtain the second mixture;

[0064] S14. The second mixture is filtered, dried, ground, and sieved to obtain a solid.

[0065] S15. Weigh out carboxyl-terminated butadiene-acrylonitrile rubber and epoxy resin at a mass ratio of 15:100 and mix them evenly to obtain the third mixture.

[0066] S16. The third mixture is heated in a vacuum environment at 150°C for a second preset time to obtain the fourth mixture;

[0067] S17. Mix the solid, the fourth mixture and the curing agent evenly to obtain a thermally conductive and insulating gel liquid;

[0068] S18. Pour the thermally conductive and insulating gel liquid into the mold for curing.

[0069] The above steps yield a thermally conductive insulating tube 11 with excellent insulation properties. It should be noted that the first preset time is typically 2-3 hours, and the second preset time is typically 3-3.5 hours.

[0070] The present invention also provides a battery module 100, which includes a battery electrode plate 3, a plurality of battery posts 2, and a plurality of composite heat dissipation pipes 1. The plurality of battery posts 2 are arranged in an array at intervals on the battery electrode plate 3, and an installation space is formed between at least two adjacent battery posts 2. The plurality of composite heat dissipation pipes 1 are arranged in an array at intervals on the battery electrode plate 3, and each composite heat dissipation pipe 1 is correspondingly accommodated in an installation space. The specific structure of the composite heat dissipation pipe 1 is as described in the above embodiments. Since the battery module 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0071] In one embodiment of this application, the battery plate 3 has multiple grooves on the side near the battery post 2, and each composite heat dissipation pipe 1 is inserted into one of the grooves. By uniformly distributing the grooves and composite heat dissipation pipes 1 on the battery plate 3, uniform heat dissipation inside the battery module 100 can be achieved, reducing local heat concentration and improving the overall performance and lifespan of the battery. The groove design ensures good fixation and contact between the composite heat dissipation pipe 1 and the battery plate 3, increasing the stability of the structure and reducing the displacement of the heat dissipation pipe due to vibration or impact. In addition, the composite heat dissipation pipe 1 is installed by insertion, which simplifies the assembly process and facilitates future maintenance and replacement.

[0072] In one embodiment of this application, the composite heat sink 1 has an air vent near the end of the groove that connects to the heat dissipation cavity; a gas flow channel 31 is formed inside the battery electrode plate 3, which connects multiple grooves. These air vents allow the organic gas generated by the organic gel 12 inside the composite heat sink 1 to enter the gas flow channel 31. During the flow, the organic gas carries heat, which helps to dissipate heat. Furthermore, when the high-temperature organic gas flows through other low-temperature composite heat sinks 1 in the gas flow channel 31, the heat it carries is further absorbed, thereby enhancing the heat dissipation effect. This process of gas flow and heat transfer forms a cycle that continues until the heat generated by the battery module 100 is fully absorbed and transferred.

[0073] In one embodiment of this application, the battery module 100 further includes a sensor disposed on the side of the battery plate 3 away from the battery post 2. The sensor is used to detect the temperature in the gas flow channel 31 or the concentration of organic solvent in the gas flow channel 31. The sensor can monitor the temperature / solvent concentration signal changes during the operation of the battery module 100 and transmit the data to the battery management system. The battery management system adjusts the battery's charging and discharging strategy based on this data and triggers corresponding protection measures, such as reducing the battery's operating current or stopping the battery's operation, to maintain the battery temperature within a safe range and to intervene in and handle battery thermal runaway in a timely manner.

[0074] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A composite heat dissipation pipe for heat dissipation of a battery module, the battery module comprising a plurality of battery pillars arranged in an array at intervals, characterized in that, The composite heat pipe includes: A thermally conductive and insulating tube, wherein a heat dissipation cavity is formed inside the thermally conductive and insulating tube, and the thermally conductive and insulating tube is housed within an installation space formed by at least two of the battery posts; and An organic gel, which fills the heat dissipation cavity.

2. The composite heat dissipation pipe as described in claim 1, characterized in that, The organic gel is a product obtained by partially drying a PVDF-HFP-based organic gel solution with a mass fraction of 10% to 30% in a vacuum environment.

3. The composite heat dissipation pipe as described in claim 2, characterized in that, The PVDF-HFP-based organic gel solution is the product obtained by dissolving PVDF-HFP in a mixed solution of dimethylacetamide (DMAC) and acetone, then adding succinate and stirring until homogeneous.

4. The composite heat dissipation pipe as described in claim 1, characterized in that, The material of the thermally conductive insulating tube is one of the following: ceramic-based thermally conductive insulating material, high thermally conductive epoxy resin, high thermally conductive silicone rubber, high thermally conductive silicone grease, or high thermally conductive filler; and / or The thickness of the thermally conductive insulating tube is t, where 0.04mm ≤ t ≤ 0.12mm.

5. A method for preparing a composite heat dissipation pipe, characterized in that, The preparation method includes the following steps: Preparation of a thermally conductive and insulating tube body; Prepare PVDF-HFP-based organic gel solutions with a mass fraction of 10%–30%; Pour the PVDF-HFP-based organic gel liquid into the thermally conductive and insulating tube body; The thermally conductive insulating tube containing the PVDF-HFP-based organic gel liquid is placed in a vacuum environment and heated so that the PVDF-HFP-based organic gel liquid is at least partially dried to transform into an organic gel.

6. The method for preparing the composite heat dissipation pipe as described in claim 5, characterized in that, The steps for preparing the thermally conductive and insulating tube body include: Prepare a silane coupling agent of a predetermined concentration; Aluminum nitride, boron nitride and other powders are added to the silane coupling agent to obtain a first mixture; The first mixture is placed in a container and stirred in a water bath at 70°C for a first preset time to obtain the second mixture; The second mixture was filtered, dried, ground, and sieved to obtain a solid. Weigh out carboxyl-terminated butadiene-acrylonitrile rubber and epoxy resin at a mass ratio of 15:100 and mix them evenly to obtain a third mixture; The third mixture is heated in a vacuum environment at 150°C for a second preset time to obtain a fourth mixture; The solid, the fourth mixture, and the curing agent are mixed evenly to obtain a thermally conductive and insulating gel liquid. The thermally conductive and insulating gel liquid is poured into a mold for curing.

7. A battery module, characterized in that, The battery module includes: Battery plates; Multiple battery columns are arranged in an array at intervals on the battery plate, and an installation space is formed between at least two adjacent battery columns. A plurality of composite heat dissipation pipes as described in any one of claims 1 to 4, wherein the plurality of composite heat dissipation pipes are arranged in an array at intervals on the battery electrode plate, and each composite heat dissipation pipe is correspondingly accommodated within the installation space.

8. The battery module as described in claim 7, characterized in that, The battery plate has multiple grooves on the side near the battery post, and each composite heat dissipation pipe is inserted into one of the grooves.

9. The battery module as described in claim 8, characterized in that, The composite heat dissipation pipe has an air vent at one end near the groove that connects to the heat dissipation cavity; The battery electrode plate has gas channels formed inside, which are used to connect multiple grooves.

10. The battery module as described in claim 9, characterized in that, The battery module also includes a sensor located on the side of the battery plate away from the battery post. The sensor probe extends into the gas channel and is used to detect the temperature or the concentration of organic solvent in the gas channel.

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