Ziptie assembly, method of making same, battery module, battery pack, and electrical device

Abstract

The application discloses a cable tie assembly and a preparation method thereof, a battery module, a battery pack and a power utilization equipment, and belongs to the technical field of power utilization equipment. The cable tie assembly is applied to the battery module. The battery module comprises a plurality of battery cells. The cable tie assembly is used for binding the plurality of battery cells into one. The cable tie assembly comprises a substrate and a phase change energy storage part. The substrate is formed with a plurality of channels. The phase change energy storage part is filled in the plurality of channels. The latent heat is absorbed or released through the phase change energy storage part, so that the heat dissipation efficiency of the cable tie assembly on the battery module is improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a cable tie assembly and its preparation method, a battery module, a battery pack, and electrical equipment. Background Technology

[0002] In related technologies, multiple cells of a battery module are bundled together using cable ties. Although existing cable ties can dissipate heat from the battery module, their heat dissipation efficiency is low. Summary of the Invention

[0003] This application provides a cable tie assembly and its preparation method, a battery module, a battery pack, and an electrical device, aiming to improve the heat dissipation efficiency of the cable tie assembly for the battery module.

[0004] To achieve the above objectives, according to a first aspect of this application, a cable tie assembly is provided for use in a battery module. The battery module includes multiple battery cells, and the cable tie assembly is used to bundle the multiple battery cells together. The cable tie assembly includes: The substrate has multiple pores; The phase change energy storage unit is filled in multiple channels and is used to absorb or release latent heat.

[0005] In one embodiment, the phase change energy storage unit includes a composite phase change material; and / or, The base material includes stainless steel.

[0006] In one embodiment, the composite phase change material includes foamed metal and paraffin.

[0007] In one embodiment, the cross-sectional area of ​​the channel is S along the depth direction, where 78.5 μm² ≤ S ≤ 7853.9 μm²; and / or, The depth of the channel is H, where 6μm≤H≤60μm.

[0008] In one embodiment, the stiffness of the substrate is K, where 3080 N / mm ≤ K ≤ 4620 N / mm; and / or, Along the direction towards the battery cell, the thickness of the substrate is H1, where 2mm≤H1≤3mm.

[0009] In one embodiment, a substrate is used to surround and enclose a receiving space for accommodating a plurality of battery cells, the substrate having a first side facing away from the receiving space, the first side having a plurality of channels formed thereon.

[0010] In one embodiment, a sealing portion is also included, which is disposed on the substrate and at least partially covers the channel to seal the phase change energy storage portion within the channel.

[0011] In one embodiment, the thickness of the sealing portion along the depth direction of the channel is H2, wherein 0.05μm≤H2≤0.2μm.

[0012] According to a second aspect of this application, a method for preparing a cable tie assembly is provided, comprising: Obtain the substrate, which has multiple channels; Obtain the phase change energy storage unit and fill it into multiple pores in the substrate.

[0013] In one embodiment, a substrate is obtained, the substrate having a plurality of channels including: Obtain the board material and clean it. The cleaned board is placed in an electrolyte containing ammonium fluoride for anodizing to obtain the substrate.

[0014] In one embodiment, obtaining a phase change energy storage unit and filling the phase change energy storage unit into a plurality of channels in a substrate includes: Obtain the phase change energy storage unit and heat it to bring it into a fluid state; The phase change energy storage unit, which is in a fluid state, is filled into multiple channels of the substrate by vacuum immersion or pressure immersion.

[0015] In one embodiment, after obtaining the phase change energy storage unit and filling the phase change energy storage unit into multiple channels of the substrate, the method further includes: Obtain the sealing part and seal the phase change energy storage part inside the channel through the sealing part.

[0016] In one embodiment, obtaining a sealing portion and sealing the phase change energy storage unit within the channel using the sealing portion includes: The substrate filled with the phase change energy storage unit is placed in a sealing liquid. Under the conditions of a first temperature and a first pressure, the substrate and the sealing liquid are controlled to react to form a sealing part on the surface of the substrate. The sealing part seals the opening of the channel to seal the phase change energy storage unit inside the channel.

[0017] In one embodiment, the sealing solution includes deionized water and a passivating agent; and / or, The first temperature is T1, where 95℃≤T1≤100℃; and / or, The first pressure is P1, where 0.05 MPa ≤ P1 ≤ 0.2 MPa.

[0018] According to a third aspect of this application, a battery module is also provided, including the cable tie assembly as described above.

[0019] According to a fourth aspect of this application, a battery pack is also provided, including the battery module as described above.

[0020] According to a fifth aspect of this application, an electrical device is also provided, including the battery pack as described above.

[0021] In the cable tie assembly of this application embodiment, when the cable tie assembly bundles the battery module, the substrate comes into contact with the battery module, and the heat of the battery module is rapidly transferred to the phase change energy storage unit within the channels. The phase change energy storage unit absorbs or releases latent heat through phase change, enabling the cable tie assembly to provide reliable mechanical support for the battery module while effectively regulating the temperature of the battery module, thereby improving the overall performance and safety of the battery module. The design combining the substrate and the phase change energy storage unit eliminates the need for additional complex heat dissipation structures in the battery module, making the battery module structure more compact, saving space, and reducing costs. In addition, the design of multiple channels increases the contact area between the phase change energy storage unit and heat, improving heat transfer efficiency, allowing the phase change energy storage unit to absorb and release heat more quickly and effectively, and improving the heat dissipation efficiency of the cable tie assembly for the battery module.

[0022] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0024] Figure 1 This is a schematic diagram of the overall structure of the battery module provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of the cable tie assembly provided in an exemplary embodiment of this disclosure; Figure 3 This is a partially enlarged schematic diagram of the substrate provided in an exemplary embodiment of this disclosure; Figure 4 This is a cross-sectional schematic diagram of the substrate provided in an exemplary embodiment of this disclosure; Figure 5 This is a cross-sectional schematic diagram of the cable tie assembly provided in an exemplary embodiment of this disclosure; Figure 6 This is a schematic flowchart of a method for preparing a cable tie assembly provided in an exemplary embodiment of this disclosure; Figure 7 yes Figure 6 A detailed flowchart of step S100 is shown below; Figure 8 yes Figure 6 A schematic diagram of the specific process for step S200.

[0025] Explanation of reference numerals in the attached figures: 100. Battery module; 10. Cable tie assembly; 11. Substrate; 111. Channel; 112. Accommodation space; 113. First side; 12. Sealing part; 20. Battery cell. Detailed Implementation

[0026] The technical solutions of the embodiments of this application 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 this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0027] This application provides an electrical device, including a battery pack, the battery pack including a battery module 100, as shown in the reference. Figure 1 , Figure 1 This is a schematic diagram of the overall structure of a battery module provided in an exemplary embodiment of this disclosure. The battery module 100 includes a cable tie assembly 10.

[0028] It should be noted that the electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical equipment, or smart cities, etc. Specifically, this application does not limit this.

[0029] Combination Figures 2 to 4 , Figure 2 This is a schematic diagram of the structure of the cable tie assembly provided in an exemplary embodiment of this disclosure; Figure 3 This is a partially enlarged schematic diagram of the substrate provided in an exemplary embodiment of this disclosure; Figure 4 This is a cross-sectional schematic diagram of the substrate provided in an exemplary embodiment of this disclosure. The cable tie assembly 10 is used in a battery module 100, which includes a plurality of battery cells 20. The cable tie assembly 10 is used to bundle the plurality of battery cells 20 together. The cable tie assembly 10 includes a substrate 11 and a phase change energy storage section. The substrate 11 has a plurality of channels 111 formed therein, and the phase change energy storage section fills the plurality of channels 111 to absorb or release latent heat.

[0030] In the cable tie assembly 10 of this application embodiment, when the cable tie assembly 10 bundles the battery module 100, the substrate 11 comes into contact with the battery module 100, and the heat of the battery module 100 is rapidly transferred to the phase change energy storage section within the channels 111. The phase change energy storage section absorbs or releases latent heat through phase change, enabling the cable tie assembly 10 to provide reliable mechanical support for the battery module 100 while effectively regulating the temperature of the battery module 100, thereby improving the overall performance and safety of the battery module 100. The combined design of the substrate 11 and the phase change energy storage section eliminates the need for additional complex heat dissipation structures in the battery module 100, making the battery module 100 structure more compact, saving space, and reducing costs. In addition, the design of multiple channels 111 increases the contact area between the phase change energy storage section and heat, improving heat transfer efficiency, enabling the phase change energy storage section to absorb and release heat more quickly and effectively, and improving the heat dissipation efficiency of the cable tie assembly 10 for the battery module 100.

[0031] The type of phase change energy storage unit can be selected as needed. For example, in some embodiments, the phase change energy storage unit includes an organic phase change material. Specifically, the organic phase change material includes any one selected from paraffin wax, polyethylene glycol, and fatty acids. In the embodiments of this application, the phase change energy storage unit includes a composite phase change material, which can significantly improve heat transfer efficiency while retaining the advantages of high latent heat by combining a high latent heat material with a high thermal conductivity material.

[0032] It should be noted that the phase change temperature of the phase change energy storage unit is within the normal operating temperature range of the lithium battery.

[0033] The type of composite phase change material can be selected as needed. In one embodiment, the composite phase change material can utilize a porous material with a large specific surface area and capillary force as a framework to draw in the molten phase change material and firmly lock it within nanometer or micrometer-sized pores. Specifically, there are various types of frameworks, such as porous carbon (e.g., activated carbon, mesoporous carbon, carbon aerogel), porous minerals (e.g., diatomaceous earth, expanded perlite, vermiculite), or metal-organic frameworks (MOFs). The phase change material includes any one of paraffin wax, polyethylene glycol, and fatty acids.

[0034] In other embodiments, the composite phase change material may be encapsulated in micron-sized capsules using a dense polymer or inorganic material shell. Specifically, this application does not limit the type of composite phase change material.

[0035] In some embodiments, the composite phase change material comprises foamed metal and paraffin wax. Thus, when paraffin wax fills the pores of the foamed metal, the metal skeleton of the foamed metal forms a rapidly thermally conductive structure within the composite material, which increases the effective thermal conductivity of the entire phase change energy storage unit by 5-20 times. After melting, the paraffin wax is confined within countless micron-sized metal pores, locked in place by surface tension and capillary forces, preventing any leakage and eliminating the need for complex sealing containers. The ligamentous structure of the foamed metal possesses a degree of elasticity, accommodating approximately 5%-15% of the volumetric expansion and contraction of the paraffin wax during the phase change process, preventing internal stress from damaging the encapsulation. The foamed metal skeleton acts as internal reinforcement, significantly improving the composite material's compressive, flexural, and impact resistance.

[0036] In some embodiments, the substrate 11 is made of stainless steel. This ensures that the stainless steel substrate 11 has sufficient mechanical strength to withstand certain external forces within the battery module 100, facilitating the assembly of the battery module 100. Since the battery module 100 expands during charging and discharging, the stainless steel substrate 11 can deform along with the battery expansion, ensuring that the cable tie assembly 10 can always effectively support the battery module 100. The battery module 100 exhibits an exothermic effect during charging and discharging, and the phase change energy storage section undergoes a phase change, absorbing heat. The temperature of the stainless steel substrate 11 does not decrease due to temperature rise, ensuring relative stability in its position close to the phase change energy storage section. Furthermore, the stainless steel substrate 11 has good corrosion resistance, thereby improving its service life.

[0037] Specifically, the material of the substrate 11 can be 202 stainless steel or 304 stainless steel. This application does not limit the material of the substrate 11.

[0038] In some embodiments, the cross-sectional area of ​​the channel 111 is S in the depth direction, where 78.5 μm² ≤ S ≤ 7853.9 μm². This facilitates the full immersion of the phase change energy storage unit and creates a large specific surface area per unit volume, thereby increasing the heat transfer area. When S > 7853.9 μm², the phase change energy storage unit is prone to leakage from the channel 111; when S < 78.5 μm², it becomes difficult for the phase change energy storage unit to overcome resistance and enter the channel 111.

[0039] It should be noted that the cross-sectional area of ​​the channel 111 can be selected as needed. For example, the cross-sectional area of ​​the channel 111 can be 78.5 μm², 1000 μm², 2000 μm², 3000 μm², 4000 μm², 5000 μm², 6000 μm², 7000 μm², 7500 μm², or 7853.9 μm², etc. Specifically, this application does not limit it in this regard.

[0040] In some embodiments, the depth of the channel 111 is H, where 6 μm ≤ H ≤ 60 μm. This ensures sufficient space to accommodate the phase change energy storage unit. When H > 60 μm, it leads to difficulties in filling the phase change energy storage unit and increases the amount of phase change energy storage unit used, resulting in increased costs. When H < 6 μm, the space to accommodate the phase change energy storage unit is small, and the filled phase change energy storage unit cannot effectively absorb the latent heat generated by the battery module 100.

[0041] It should be noted that the depth of the channel 111 can be selected as needed. For example, the depth of the channel 111 can be 6μm, 10μm, 20μm, 30μm, 40μm, 50μm, or 60μm, etc. Specifically, this application does not limit it in this regard.

[0042] In some embodiments, the stiffness of the substrate 11 is K, where 3080 N / mm ≤ K ≤ 4620 N / mm. This allows the substrate 11 to disperse energy through small elastic deformation rather than sudden cracking when subjected to assembly stress, vibration impact, or localized thermal stress. When K < 3080 N / mm, the substrate 11 is easily deformed by heat or external forces. When K > 4620 N / mm, the substrate 11 is prone to brittle fracture.

[0043] It should be noted that the stiffness of the base 11 can be selected as needed. For example, the stiffness of the base 11 can be 3080 N / mm, 3500 N / mm, 3600 N / mm, 4000 N / mm, 4100 N / mm, 4300 N / mm, 4400 N / mm, or 4620 N / mm, etc. Specifically, this application does not limit it in this regard.

[0044] In some embodiments, the thickness of the substrate 11 along the direction toward the cell 20 is H1, wherein 2mm ≤ H1 ≤ 3mm. This balances strength and thermal resistance, and ensures that the substrate 11 has sufficient section modulus to resist bending moments and stresses caused by volume changes in the phase change material, external vibrations, or assembly pressure. When H1 < 2mm, the substrate 11 lacks sufficient strength and is prone to bending, warping, or cracking. When H1 > 3mm, the thermal resistance of the substrate 11 is high, increasing production costs.

[0045] It should be noted that the thickness of the substrate 11 can be selected as needed. For example, the thickness of the substrate 11 can be 2mm, 2.2mm, 2.5mm, 2.8mm, or 3mm, etc. Specifically, this application does not limit it in this regard.

[0046] In some embodiments, the substrate 11 is used to surround and enclose a housing space 112 for accommodating the plurality of battery cells 20, and a plurality of channels 111 are formed on a first side 113 of the substrate 11 opposite to the housing space 112. This ensures that if the phase change energy storage section leaks within the channels 111, it will not contaminate the battery cells 20 or cause an electrical short circuit. Furthermore, the housing space 112 for accommodating the plurality of battery cells 20 remains unaffected, achieving a physical integration of thermal management and structural support functions.

[0047] It should be noted that, in other embodiments, the base 11 further has a second side facing the receiving space 112 and two ends located between the second side and the first side 113, and at least one of the second side and the two ends may be provided with a channel 111. For example, in one embodiment, both the first side 113 and the second side may be provided with a channel 111. In yet another embodiment, the first side 113, the second side, and the ends may be provided with channels 111. Specifically, this application does not limit this.

[0048] Reference Figure 5 , Figure 5 This is a cross-sectional schematic diagram of a cable tie assembly provided in an exemplary embodiment of this disclosure. In some embodiments, the cable tie assembly 10 further includes a sealing portion 12, which is disposed on the substrate 11 and at least partially covers the through hole to seal the phase change energy storage portion within the channel 111, thereby preventing leakage and volatilization of the phase change energy storage portion after the phase change occurs, and further improving the corrosion resistance of the cable tie assembly 10.

[0049] The shape of the sealing portion 12 can be selected as needed. For example, in one embodiment, the shape of the sealing portion 12 can be adapted to the opening of the channel 111, so that the sealing portion 12 is sealed to the inner wall of the channel 111. In another embodiment, the sealing portion 12 can be a layer structure covering the entire surface of the substrate 11 where the channel 111 is provided. Specifically, this application does not limit this.

[0050] In some embodiments, the thickness of the sealing portion 12 along the depth direction of the channel 111 is H2, wherein 0.05 μm ≤ H2 ≤ 0.2 μm. This allows the sealing portion 12 to effectively lock in the molten phase change material and maintain good adhesion to the edge of the channel 111 opening during phase change cycles, preventing peeling or fatigue cracking and achieving a long-life seal. When H2 > 0.2 μm, the internal stress of the sealing portion 12 is high, and the sealing portion 12 is prone to detachment or cracking. When H2 < 0.05 μm, the sealing portion 12 has poor resistance to cyclic stress, is prone to cracking, and has poor sealing performance.

[0051] It should be noted that the thickness of the sealing portion 12 can be selected as needed. For example, the thickness of the sealing portion 12 can be 0.05μm, 0.08μm, 0.1μm, 0.15μm, 0.18μm, or 0.2μm, etc. Specifically, this application does not limit it in this regard.

[0052] According to the second aspect of this disclosure, referring to Figure 6 , Figure 6 This is a schematic flowchart illustrating a method for preparing a cable tie assembly according to an exemplary embodiment of this disclosure. This application provides a method for preparing a cable tie assembly, comprising: Step S100: Obtain substrate 11, which has multiple channels 111.

[0053] It should be noted that the shape of the cross-section of the channel 111 in the depth direction can be selected as needed. For example, the shape of the cross-section of the channel 111 can be circular, elliptical, square, or triangular, etc. Specifically, this application does not limit it in this regard.

[0054] Step S200: Obtain the phase change energy storage unit and fill the phase change energy storage unit into the multiple channels 111 of the substrate 11.

[0055] In the fabrication method of the cable tie assembly 10 according to this application embodiment, a substrate 11 is obtained, the substrate 11 is provided with multiple channels 111, a phase change energy storage unit is obtained, and the phase change energy storage unit is filled into the multiple channels 111 of the substrate 11. Through phase change absorption or release of latent heat by the phase change energy storage unit, the cable tie assembly 10 can provide reliable mechanical support for the battery module 100 while effectively regulating the temperature of the battery module 100, thereby improving the overall performance and safety of the battery module 100. The design combining the substrate 11 and the phase change energy storage unit eliminates the need for additional complex heat dissipation structures in the battery module 100, making the battery module 100 structure more compact, saving space, and reducing costs. Furthermore, the design of multiple channels 111 increases the contact area between the phase change energy storage unit and heat, improving heat transfer efficiency, enabling the phase change energy storage unit to absorb and release heat more quickly and effectively, and improving the heat dissipation efficiency of the cable tie assembly 10 for the battery module 100.

[0056] Reference Figure 7 , Figure 7 yes Figure 6 A schematic diagram of the specific process of step S100. In some embodiments, step S100 involves obtaining a substrate 11, the substrate 11 having a plurality of channels 111, including: Step S110: Obtain the board material and clean it.

[0057] It should be noted that cleaning the board in this step can remove oil or impurities from the surface of the board, ensuring the smoothness of the board surface and preparing it for subsequent processes.

[0058] Step S120: Place the cleaned board in an electrolyte containing ammonium fluoride for anodizing reaction to obtain substrate 11.

[0059] Specifically, in this step, after the anodic oxidation reaction, a micron-sized porous layer with specific pore size and depth is formed on the surface of the substrate 11. After the reaction is completed, the substrate 11 is removed and rinsed with deionized water in preparation for subsequent processes.

[0060] Reference Figure 8 , Figure 8 yes Figure 6 A detailed flowchart of step S200 is provided. In some embodiments, step S200, which involves obtaining a phase change energy storage unit and filling the phase change energy storage unit into multiple channels 111 of the substrate 11, includes: Step S210: Obtain the phase change energy storage unit and heat the phase change energy storage unit to make it in a fluid state.

[0061] It should be noted that the type of phase change energy storage unit can be selected as needed. In the embodiments of this application, the phase change energy storage unit includes foamed metal and paraffin wax. The heating temperature of the phase change energy storage unit is 80°C to 90°C. The heating temperature of the phase change energy storage unit can be 80°C, 83°C, 85°C, 86°C, 88°C, or 90°C, etc. Specifically, this application does not limit this.

[0062] Step S220: The phase change energy storage unit in a fluid state is filled into multiple channels 111 of the substrate 11 by vacuum immersion or pressure immersion.

[0063] In this step, vacuum immersion or pressure immersion techniques are already mature, and the principles of vacuum immersion or pressure immersion will not be elaborated here. Furthermore, when pressure immersion is used, the applied pressure is F, where 0.1 MPa ≤ F ≤ 0.3 MPa. The applied pressure can be selected as needed; for example, the applied pressure can be 0.1 MPa, 0.13 MPa, 0.15 MPa, 0.18 MPa, 0.2 MPa, 0.25 MPa, or 0.3 MPa, etc. Specifically, this application does not limit this. Additionally, the phase change energy storage unit in a fluid state is filled into the multiple channels 111 of the substrate 11 for 1 hour to 3 hours, preferably 2 hours.

[0064] In addition, after the phase change energy storage unit is immersed in multiple channels 111, the phase change material of the phase change energy storage unit is solidified in the channels 111 by natural cooling or a specific cooling method.

[0065] In some embodiments, after obtaining the phase change energy storage unit and filling the phase change energy storage unit into the plurality of channels 111 of the substrate 11 in step S200, the method further includes: Step S300: Obtain the sealing part 12 and seal the phase change energy storage part in the channel 111 through the sealing part 12.

[0066] In this step, the sealing part 12 is obtained, and the phase change energy storage part is sealed in the channel 111 by the sealing part 12, thereby preventing the leakage of the phase change energy storage part which is in a fluid state after the phase change.

[0067] In some embodiments, step S300, obtaining the sealing portion 12 and sealing the phase change energy storage portion within the channel 111 using the sealing portion 12, includes: Step S310: The substrate 11 filled with the phase change energy storage unit is placed in the sealing liquid. Under the first temperature and first pressure conditions, the substrate 11 reacts with the sealing liquid to form a sealing part 12 on the surface of the substrate 11. The sealing part 12 seals the opening of the channel 111 to seal the phase change energy storage unit inside the channel 111.

[0068] In this step, the formed sealing part 12 is a layer structure, which covers the opening of the channel 111, thereby sealing the opening of the channel 111 and sealing the phase change energy storage part inside the channel 111.

[0069] Specifically, the type of sealing solution can be selected as needed. For example, in one embodiment, the sealing solution includes deionized water and a passivating agent, with deionized water as the solvent and the passivating agent as the solute. Specifically, the passivating agent can be a silicate or a phosphate.

[0070] Furthermore, the first temperature is T1, where 95℃≤T1≤100℃, which accelerates the dissolution of the passivating agent. The first pressure is P1, where 0.05MPa≤P1≤0.2MPa. This ensures that the passivating agent reacts with the substrate 11, producing a sealing portion 12 on the surface of the substrate 11 to seal the opening of the channel 111. The sealing portion 12 protects the phase change energy storage unit, extends its service life, and simultaneously provides the cable tie assembly 10 with good thermal management, reducing the risk of safety problems caused by overheating of the battery module 100 and improving the safety and reliability of the battery module 100.

[0071] It should be noted that after the sealing process, the substrate 11 with the sealing part 12 is taken out, rinsed with deionized water and dried to obtain the cable tie assembly 10 for bundling multiple battery cells 20.

[0072] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0073] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0074] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A cable tie assembly, used in a battery module, the battery module comprising multiple battery cells, the cable tie assembly being used to bundle the multiple battery cells together, characterized in that, The cable tie assembly includes: The substrate has multiple pores; A phase change energy storage unit is filled within a plurality of the aforementioned channels, the phase change energy storage unit being used to absorb or release latent heat.

2. The cable tie assembly according to claim 1, characterized in that, The phase change energy storage unit includes a composite phase change material; and / or, The substrate is made of stainless steel.

3. The cable tie assembly according to claim 2, characterized in that, The composite phase change material includes metal foam and paraffin wax.

4. The cable tie assembly according to any one of claims 1 to 3, characterized in that, In the depth direction of the channel, the cross-sectional area of ​​the channel is S, where 78.5 μm² ≤ S ≤ 7853.9 μm²; and / or, The depth of the channel is H, where 6μm≤H≤60μm.

5. The cable tie assembly according to any one of claims 1 to 4, characterized in that, The stiffness of the substrate is K, where 3080 N / mm ≤ K ≤ 4620 N / mm; and / or, Along the direction toward the battery cell, the thickness of the substrate is H1, where 2mm ≤ H1 ≤ 3mm.

6. The cable tie assembly according to any one of claims 1 to 5, characterized in that, The substrate is used to surround and enclose a receiving space for accommodating the multiple battery cells, and the substrate has a first side facing away from the receiving space, on which a plurality of channels are formed.

7. The cable tie assembly according to any one of claims 1 to 6, characterized in that, It also includes a sealing portion disposed on the substrate and at least partially covering the channel to seal the phase change energy storage portion within the channel.

8. The cable tie assembly according to claim 7, characterized in that, Along the depth direction of the channel, the thickness of the sealing part is H2, wherein 0.05μm≤H2≤0.2μm.

9. A method for preparing a cable tie assembly, characterized in that, include: Obtain a substrate having multiple channels; Obtain the phase change energy storage unit and fill the phase change energy storage unit into multiple channels of the substrate.

10. The method for preparing the cable tie assembly according to claim 9, characterized in that, The substrate is obtained, and the substrate is provided with multiple channels, including: Obtain the board material and clean it. The cleaned plate is placed in an electrolyte containing ammonium fluoride for anodizing to obtain the substrate.

11. The method for preparing the cable tie assembly according to claim 9 or 10, characterized in that, The step of obtaining the phase change energy storage unit and filling the phase change energy storage unit into multiple channels of the substrate includes: Obtain the phase change energy storage unit and heat the phase change energy storage unit to bring it into a fluid state; The phase change energy storage unit, which is in a fluid state, is filled into multiple channels of the substrate by vacuum immersion or pressure immersion.

12. The method for preparing the cable tie assembly according to any one of claims 9 to 11, characterized in that, The process of obtaining the phase change energy storage unit and filling the phase change energy storage unit into multiple channels of the substrate further includes: A sealing section is obtained, and the phase change energy storage section is sealed in the channel through the sealing section.

13. The method for preparing the cable tie assembly according to claim 12, characterized in that, The method of obtaining the sealing part, and sealing the phase change energy storage part within the channel by the sealing part, includes: The substrate filled with the phase change energy storage unit is placed in a sealing liquid, and the substrate is controlled to react with the sealing liquid under a first temperature and a first pressure condition to form the sealing part on the surface of the substrate. The sealing part seals the opening of the channel to seal the phase change energy storage unit in the channel.

14. The method for preparing the cable tie assembly according to claim 13, characterized in that, The sealing solution includes deionized water and a passivating agent; and / or, The first temperature is T1, wherein 95℃≤T1≤100℃; and / or, The first pressure is P1, where 0.05 MPa ≤ P1 ≤ 0.2 MPa.

15. A battery module, characterized in that, Includes the cable tie assembly as described in any one of claims 1 to 8.

16. A battery pack, characterized in that, Includes the battery module as described in claim 15.

17. An electrical appliance, characterized in that, Includes the battery pack as described in claim 16.

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