Lightweight composite cooling pipe, battery pack and electric device
Patent Information
- Application Number
- CN202520758328.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-04-21
AI Technical Summary
其中，尼龙基材料(PA11/PA12/PA612单/多层管)因分子链中的酰胺基团易水解，在长期高温高湿工况下存在老化风险；而TPV多层管及编织管均为密实TPV材质，整体重量较大，与新能源汽车的轻量化诉求存在冲突
[0009]本申请至少包括以下有益效果：本申请公开的轻量化复合冷却管通过多层材料协同设计和功能化分层，在满足冷却管性能需求的同时，还可以降低冷却管的整体密度，符合新能源汽车轻量化的要求。本申请所述冷却管第一层为PP层和/或TPV层，PP和TPV材料具有良好的耐液性能、机械性能以及和接头的密封性能，可以防止冷却管因高温、水解等原因被老化，提高冷却管的安全性和使用寿命；本申请所述冷却管的第二层为发泡TPV层，其密度较未发泡前大大降低，可以降低冷却管的密度，满足新能源汽车轻量化的需求，而且发泡TPV的韧性和挺性平衡，可以满足冷却管的性能需求；本申请所述冷却管的第三层为PP、PA和/或PE层，可以在保证满足冷却管性能需求的同时进一步降低冷却管密度。
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Abstract
Description
Technical Field
[0001] This application belongs to the field of cooling pipe technology, specifically relating to a lightweight composite cooling pipe, a battery pack, and an electrical device. Background Technology
[0002] New energy vehicles are becoming the mainstream direction for the future development of the automotive industry. With the gradual maturation of various core technologies, the industry has moved from the basic performance verification stage to the period of in-depth optimization. Currently, while ensuring that key indicators such as power and safety meet the standards, improving the energy efficiency of the entire vehicle through the development of sustainable material applications and lightweight integration technologies has become an important breakthrough for the technological upgrading of new energy vehicles.
[0003] The battery pack plays a crucial role as the power source for new energy vehicles. During vehicle operation, the battery pack generates significant heat, and a common heat dissipation method involves installing cooling medium transmission pipelines within the small, enclosed space of the battery pack. Currently, cooling pipes for new energy vehicles mostly use single-layer or multi-layer PA11, PA12, or PA612 pipes, or TPV multi-layer pipes and braided pipes. Among these, nylon-based materials (PA11 / PA12 / PA612 single / multi-layer pipes) are prone to aging under long-term high-temperature and high-humidity conditions due to the easy hydrolysis of amide groups in their molecular chains; while TPV multi-layer pipes and braided pipes are made of dense TPV material, resulting in a large overall weight, which conflicts with the lightweight requirements of new energy vehicles. Utility Model Content
[0004] In view of the technical problems existing in the background art, this application provides a lightweight composite cooling pipe, a battery pack, and an electrical device, specifically including the following:
[0005] The first aspect of this application discloses a lightweight composite cooling pipe, which comprises at least a first layer, a second layer, and a third layer in a radially outward direction, wherein,
[0006] The first layer comprises a polypropylene (PP) material layer and / or a thermoplastic vulcanized elastomer (TPV) material layer;
[0007] The second layer includes at least one layer of foamed thermoplastic vulcanized elastomer (TPV) material;
[0008] The third layer includes a polypropylene (PP) material layer, and / or a nylon (PA) material layer, and / or a polyethylene (PE) layer.
[0009] This application includes at least the following beneficial effects: The lightweight composite cooling pipe disclosed in this application, through multi-layer material synergy design and functional layering, can reduce the overall density of the cooling pipe while meeting the performance requirements, thus meeting the lightweight requirements of new energy vehicles. The first layer of the cooling pipe described in this application is a PP layer and / or a TPV layer. PP and TPV materials have good liquid resistance, mechanical properties, and sealing performance of joints, which can prevent the cooling pipe from aging due to high temperature, hydrolysis, etc., and improve the safety and service life of the cooling pipe. The second layer of the cooling pipe described in this application is a foamed TPV layer, whose density is greatly reduced compared to the unfoamed version, which can reduce the density of the cooling pipe and meet the lightweight requirements of new energy vehicles. Moreover, the balance of toughness and stiffness of foamed TPV can meet the performance requirements of the cooling pipe. The third layer of the cooling pipe described in this application is a PP, PA, and / or PE layer, which can further reduce the density of the cooling pipe while ensuring that the performance requirements of the cooling pipe are met.
[0010] In some embodiments, the first layer of the cooling pipe comprises a polypropylene material layer or a thermoplastic vulcanized elastomer material layer. This reduces the liquid absorption rate of the first layer and increases the service life of the cooling pipe.
[0011] In some embodiments, the third layer of the cooling pipe includes a polypropylene layer, a nylon layer, or a polyethylene layer. This allows for a further reduction in the overall density of the cooling pipe while still meeting its performance requirements.
[0012] In some embodiments, the second layer comprises at least two layers of foamed thermoplastic vulcanizate material, with a reinforcing layer disposed between adjacent layers. This increases the strength of the second layer and further improves the performance of the cooling pipe.
[0013] In some embodiments, the reinforcing layer comprises a polypropylene material layer, a PA612 material layer, or a PA12 material layer. This further improves the performance of the cooling pipe.
[0014] In some embodiments, the thickness of the reinforcing layer is 0.3 mm to 0.7 mm. This can further improve the performance of the cooling pipe.
[0015] In some embodiments, the density of the foamed thermoplastic vulcanizate material layer is 0.35 g / cm³. 3 -0.84g / cm 3 Therefore, while meeting the performance requirements of the cooling pipe, the overall density of the cooling pipe can be further reduced. The density of the foamed thermoplastic vulcanized elastomer material layer is preferably 0.35 g / cm³. 3 -0.66g / cm 3 .
[0016] In some embodiments, the porosity of the foamed thermoplastic vulcanizate material layer is 30%-75%. This allows for a further reduction in the overall density of the cooling pipe while meeting its performance requirements. Preferably, the porosity of the foamed thermoplastic vulcanizate material layer is 45%-70%.
[0017] In some embodiments, the total wall thickness of the cooling pipe is 1.7mm-5.5mm. This allows for a reduction in the overall density of the cooling pipe while still meeting its performance requirements. Preferably, the total wall thickness of the cooling pipe is 1.7mm-5mm.
[0018] In some implementations, the thickness of the first layer is 0.8mm-1mm. This allows for a reduction in the overall density of the cooling pipe while still meeting its performance requirements.
[0019] In some implementations, the thickness of the second layer is 0.6mm-3mm. This allows for a reduction in the overall density of the cooling pipe while still meeting its performance requirements.
[0020] In some implementations, the thickness of the third layer is 0.3mm-1.5mm. This allows for a reduction in the overall density of the cooling pipe while still meeting its performance requirements.
[0021] The second aspect of this application discloses a battery pack comprising the lightweight composite cooling pipe described in the first aspect of this application.
[0022] The third aspect of this application discloses an electrical device comprising the lightweight composite cooling pipe described in the first aspect of this application and / or the battery pack described in the second aspect of this application.
[0023] In some implementations, the electrical device includes a new energy vehicle. Attached Figure Description
[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application; irrelevant details have been omitted for clarity. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0025] Figure 1 This is a schematic cross-sectional view of the cooling pipe disclosed in Embodiment 1 of this application;
[0026] Figure 2 This is a schematic cross-sectional view of the cooling pipe disclosed in Embodiment 14 of this application;
[0027] Figure 3This is a schematic diagram of the cooling pipe assembly for this application. Detailed Implementation
[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments shown below are not intended to limit the scope of the invention as described in the claims. Furthermore, the complete contents of the configurations shown in the embodiments below are not limited to those necessary for the solution of the invention as described in the claims.
[0029] Reference Appendix Figure 1 This application discloses a lightweight composite cooling pipe, comprising at least a first layer 1, a second layer 2, and a third layer 3 radially outward. The first layer 1 comprises a polypropylene (PP) material layer and / or a thermoplastic vulcanizate (TPV) material layer; the second layer 2 comprises at least one foamed thermoplastic vulcanizate (TPV) material layer; and the third layer 3 comprises a polypropylene (PP) material layer, and / or a nylon (PA) material layer, and / or a polyethylene (PE) layer. The lightweight composite cooling pipe disclosed in this application, through multi-layer material synergy design and functional layering, can reduce the overall density of the cooling pipe while meeting its performance requirements, thus complying with the lightweight requirements of new energy vehicles. The first layer 1 of the cooling pipe described in this application is a PP layer and / or a TPV layer. PP and TPV materials have good liquid resistance, mechanical properties, and sealing performance of joints, which can prevent the cooling pipe from aging due to high temperature, hydrolysis, etc., and improve the safety and service life of the cooling pipe. The second layer 2 of the cooling pipe described in this application is a foamed TPV layer, whose density is greatly reduced compared to the unfoamed version, which can reduce the density of the cooling pipe and meet the lightweight requirements of new energy vehicles. Moreover, the foamed TPV has a balance of toughness and stiffness, which can meet the performance requirements of the cooling pipe. The third layer 3 of the cooling pipe described in this application is a PP, PA, and / or PE layer, which can further reduce the density of the cooling pipe while ensuring that the performance requirements of the cooling pipe are met.
[0030] In some embodiments, the first layer 1 of the cooling pipe comprises a polypropylene material layer or a thermoplastic vulcanized elastomer material layer. The first layer 1 of the cooling pipe is in direct contact with the coolant. This application specifies that the first layer 1 is made of PP or TPV material, which can reduce the liquid absorption rate of the cooling pipe and improve its service life.
[0031] In some embodiments, the third layer 3 of the cooling pipe includes a polypropylene material layer, a nylon material layer, or a polyethylene layer. This application specifies that the material of the third layer 3 is PP, PA, or PE, which, while meeting the performance requirements of the cooling pipe, can further reduce the overall density of the cooling pipe.
[0032] Reference Appendix Figure 2In some embodiments, the second layer 2 comprises at least two layers of foamed thermoplastic vulcanizate (TPV) material, with a reinforcing layer 2' disposed between adjacent layers. The reinforcing layer 2' strengthens the interface between adjacent TPV layers when the second layer 2 comprises multiple layers of foamed TPV, further improving the strength of the second layer 2 and thus enhancing the performance of the cooling pipe. In the cooling pipe disclosed in this application, the specific number of foamed TPV layers and reinforcing layer 2' in the second layer 2 can be set according to actual needs. By adjusting the number of foamed TPV layers and reinforcing layer 2', different requirements for pipe wall thickness, strength, cooling pipe weight, and thermal insulation performance can be met, making the cooling pipe described in this application suitable for various application scenarios.
[0033] In some embodiments, the reinforcing layer 2' comprises a polypropylene material layer, a PA612 material layer, or a PA12 material layer. This application further specifies that the reinforcing layer 2' is a layer of PP, PA612, or PA12 material, which can further improve the performance of the cooling pipe. It should be noted that PA612 mentioned in this application refers to polyamide 612, a long-chain aliphatic nylon formed by the condensation polymerization of hexamethylenediamine (6 carbons) and dodecanoic acid (12 carbons). PA12 mentioned in this application refers to polyamide 12, a long-chain aliphatic nylon formed by the ring-opening polymerization of dodecyl lactam.
[0034] In some embodiments, the thickness of the reinforcing layer 2' is 0.3mm-0.7mm, for example, it can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, or any range between two of the above values. This can further improve the performance of the cooling pipe.
[0035] In some embodiments, the density of the foamed thermoplastic vulcanizate material layer is 0.35 g / cm³. 3 -0.84g / cm 3 For example, it could be 0.35 g / cm³. 3 0.40g / cm 3 0.50g / cm 3 0.60g / cm 3 0.70g / cm 3 0.80g / cm 3 0.84 g / cm 3 The density of the cooling pipe can be either equal to or within a range of any two of the above values. Therefore, while meeting the performance requirements of the cooling pipe, the overall density of the cooling pipe can be further reduced. The density of the foamed thermoplastic vulcanized elastomer material layer is preferably 0.35 g / cm³. 3 -0.66g / cm3 .
[0036] In some embodiments, the porosity of the foamed thermoplastic vulcanizate material layer is 30%-75%, for example, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc., or any range between two of the above values. Therefore, while meeting the performance requirements of the cooling pipe, the overall density of the cooling pipe can be further reduced. The porosity of the foamed thermoplastic vulcanizate material layer is preferably 45%-70%.
[0037] In some embodiments, the total wall thickness of the cooling pipe is 1.7mm-5.5mm, for example, it can be 1.7mm, 1.8mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, or any range between two of these values. This allows for a reduction in the overall density of the cooling pipe while meeting its performance requirements. The preferred total wall thickness of the cooling pipe is 1.7mm-5mm.
[0038] In some embodiments, the thickness of the first layer 1 is 0.8mm-1mm, for example, it can be 0.8mm, 0.82mm, 0.85mm, 0.88mm, 0.90mm, 0.92mm, 0.95mm, 0.98mm, 1mm, or any range between two of the above values. This application further specifies that the thickness of the first layer 1 is in the range of 0.8mm-1mm, which allows the cooling pipe to further meet the requirements of lightweight design, and also balances the rigidity and flexibility of the cooling pipe.
[0039] In some embodiments, the thickness of the second layer 2 is 0.6mm-3mm, for example, it can be 0.6mm, 0.65mm, 0.68mm, 0.7mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any range between two of the above values. This application further limits the thickness of the second layer 2 to 0.6mm-3mm, which can further reduce the overall density of the cooling pipe while meeting the performance requirements of the cooling pipe.
[0040] In some implementations, the thickness of the third layer 3 is 0.3mm-1.5mm, for example, it can be 0.27mm, 0.3mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, or any range between two of the above values. Therefore, while meeting the performance requirements of the cooling pipe, the overall density of the cooling pipe can be further reduced.
[0041] The second aspect of this application discloses a battery pack comprising the lightweight composite cooling pipe described in the first aspect of this application.
[0042] The third aspect of this application discloses an electrical device comprising the lightweight composite cooling pipe described in the first aspect of this application and / or the battery pack described in the second aspect of this application.
[0043] In some implementations, the electrical device includes a new energy vehicle.
[0044] Example 1
[0045] refer to Figure 1 A lightweight composite cooling pipe, comprising a first layer 1 of PP material with an inner diameter of 16mm and a thickness of 1mm, and a second layer 2 of PP material with a thickness of 1mm and a density of 0.52g / cm³. 3 The first layer is a foamed TPV material layer (single layer), and the third layer is a PP material layer with a thickness of 1mm.
[0046] The difference between Example 2 and Example 1 is that the first layer 1 is a TPV material layer, while the other conditions are the same as in Example 1, as detailed in Table 1.
[0047] The difference between Examples 3-6 and Example 1 is that the thickness of the first layer 1 is different, while the other conditions are the same as those in Example 1, as detailed in Table 1.
[0048] The difference between Examples 7-10 and Example 1 is that the density of the foamed TPV material layer is different. All other conditions are the same as in Example 1, as detailed in Table 1.
[0049] The difference between Examples 11-13 and Example 1 is that the thickness of the foamed TPV material layer is different. All other conditions are the same as in Example 1. See Table 1 for details.
[0050] Reference Appendix Figure 2 The difference between Example 14 and Example 1 is that the second layer 2 comprises two layers with a thickness of 1 mm and a density of 0.52 g / cm³. 3 The foamed TPV material layer has a 0.4mm thick PP reinforcement layer 2' between the two foamed TPV layers. All other conditions are the same as in Example 1, as detailed in Table 1.
[0051] The difference between Examples 15-16 and Example 14 is that the material of the reinforcing layer 2' is different. All other conditions are the same as in Example 14, as detailed in Table 1.
[0052] The difference between Examples 17-20 and Example 14 is that the thickness of the reinforcing layer 2' is different. All other conditions are the same as in Example 14, as detailed in Table 1.
[0053] The difference between Examples 21-22 and Example 1 is that the material of the third layer 3 is different. All other conditions are the same as in Example 1, as detailed in Table 1.
[0054] The difference between Examples 23-25 and Example 1 is that the thickness of the third layer 3 is different. All other conditions are the same as in Example 1, as detailed in Table 1.
[0055] Comparative Example 1 provides a cooling pipe with an inner diameter of 16 mm, a thickness of 2.9 mm, and a material of PP, as detailed in Table 1.
[0056] Comparative Example 2 provides a cooling pipe with an inner diameter of 16 mm, a thickness of 2.9 mm, and a material of TPV, as detailed in Table 1.
[0057] Comparative Example 3 provides a cooling pipe with an inner diameter of 16 mm, a thickness of 2.9 mm, and a material of PA12, as detailed in Table 1.
[0058] Comparative Example 4 provides a cooling pipe with a first layer 1 having an inner diameter of 16 mm, a thickness of 1.5 mm, and made of TPV; a second layer 2 being a polyester yarn layer with a thickness of 1 mm; and a third layer 3 being a TPV layer with a thickness of 2.5 mm, as detailed in Table 1.
[0059] The density and tensile strength parameters of PP, TPV, PA612, PA12, and PE used in the embodiments of this application are shown in Table 2. According to the Gibson-Ashby simplified model, the tensile strength of the foamed material = tensile strength before foaming * (density after foaming / density before foaming). n , where n is an index related to the bubble structure.
[0060] Table 1
[0061]
[0062]
[0063] Table 2
[0064]
[0065] The performance of the cooling pipes in the embodiments and comparative examples was tested, and the specific test methods are as follows:
[0066] (1) Sealing performance test: Refer to Appendix Figure 3 (a is before assembly, b is after assembly), connect the cooling pipe 4 to the connector 5 and fix it with pipe clamp 6 and clamp 7, then perform a sealing performance test. The connector used in this application is a PA612 material connector. The connection structure between the cooling pipe and the connector is shown in the attached figure. Figure 3 The test method refers to the national standard GB / T 18948-2009. At 65℃, a mixture of ethylene glycol and water is used as the coolant and delivered to the cooling pipe for a 168-hour sealing test.
[0067] (2) Bursting strength test: Referring to the national standard GB / T 18948-2009, the cooling pipe was subjected to a burst test under the test condition of a pressure increase rate of 0.5 bar / min.
[0068] (3) Weight inspection: Refer to the national standard GB / T 26797-2011, measure the weight of the 30cm long cooling pipe by weighing.
[0069] The samples obtained in Examples 1-26 and Comparative Examples 1-4 were tested according to the above test methods, and the test results are shown in Table 3:
[0070] Table 3
[0071]
[0072]
[0073] As can be seen from the test results in Table 3, the sealing performance of the cooling pipe and connector connection in this embodiment is significantly better than that of the cooling pipes in Comparative Examples 1-4. After a 168-hour sealing test at 65°C, none of the cooling pipes in this embodiment showed leakage, while all of those in Comparative Examples 1-4 showed leakage. Moreover, with the same pipe wall thickness, the cooling pipes in this embodiment have a greater advantage in terms of weight reduction. In addition, the burst strength of the cooling pipes in this embodiment is all >8 bar, which meets the requirements for cooling pipes used in new energy vehicles.
[0074] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.
Claims
1. A lightweight composite cooling pipe, characterized in that, It includes at least a first layer, a second layer, and a third layer in a radially outward direction, wherein, The first layer includes a polypropylene material layer and / or a thermoplastic vulcanized elastomer material layer; The second layer includes at least one layer of foamed thermoplastic vulcanized elastomer material; The third layer includes a polypropylene material layer, and / or a nylon material layer, and / or a polyethylene layer.
2. The lightweight composite cooling pipe according to claim 1, characterized in that, One or more of the following conditions must be met: The first layer includes a polypropylene material layer or a thermoplastic vulcanized elastomer material layer; The third layer includes a polypropylene material layer, a nylon material layer, or a polyethylene layer.
3. The lightweight composite cooling pipe according to claim 1, characterized in that, The second layer includes at least two layers of foamed thermoplastic vulcanized elastomer material, wherein a reinforcing layer is provided between each pair of adjacent foamed thermoplastic vulcanized elastomer material layers.
4. The lightweight composite cooling pipe according to claim 3, characterized in that, The reinforcing layer includes a polypropylene material layer, a PA612 material layer, or a PA12 material layer.
5. The lightweight composite cooling pipe according to claim 4, characterized in that, The thickness of the reinforcing layer is 0.3mm-0.7mm.
6. The lightweight composite cooling pipe according to claim 1, characterized in that, The foamed thermoplastic vulcanizate elastomer material layer satisfies one or more of the following conditions: The density is 0.32 g / cm³. 3 -0.84 g / cm 3 ; The porosity is 30%-75%.
7. The lightweight composite cooling pipe according to claim 6, characterized in that, The density of the foamed thermoplastic vulcanizate material layer is 0.32 g / cm³. 3 -0.66 g / cm 3 .
8. The lightweight composite cooling pipe according to claim 6, characterized in that, The porosity of the foamed thermoplastic vulcanized elastomer material layer is 45%-70%.
9. The lightweight composite cooling pipe according to any one of claims 1-6, characterized in that, One or more of the following conditions must be met: The total wall thickness of the cooling pipe is 1.7mm-5.5mm; The thickness of the first layer is 0.8mm-1mm; The thickness of the second layer is 0.6mm-3mm; The thickness of the third layer is 0.3mm-1.5mm.
10. The lightweight composite cooling pipe according to claim 9, characterized in that, The total wall thickness of the cooling pipe is 1.7mm-5mm.
11. A battery pack, characterized in that, It includes the lightweight composite cooling pipe according to any one of claims 1-10.
12. An electrical appliance, characterized in that, It includes the lightweight composite cooling pipe as described in any one of claims 1-10 and / or the battery pack as described in claim 11.
13. The electrical appliance according to claim 12, characterized in that, The electrical devices include new energy vehicles.