High-temperature-resistant high-insulation mica shell structure

Abstract

The invention relates to the technical field of protection of a battery pack PACK inner connecting row, and discloses a high-temperature-resistant high-insulation mica shell structure, which comprises a mica shell, a mica adhesive tape and a PI polyimide adhesive tape, the mica shell is formed by stacking a plurality of layers of thin mica paper and then putting the mica paper into a mold with a specific shape for hot pressing, and the mica shell is firstly assembled on an injection molding shell and then is assembled on the PI polyimide adhesive tape. Fixing the battery pack in a specified protection position in the battery pack through a mica adhesive tape and a PI (polyimide) adhesive tape; according to the high-temperature-resistant and high-insulation mica shell structure, material adaptation, structure protection and fixing guarantee serve as the core, the thought of prevention-blocking-redundancy protection is followed, phlogopite is selected as the raw material, and the high-temperature-resistant and high-insulation characteristics of the phlogopite are utilized to adapt to a thermal runaway scene; a plurality of layers of thin phlogopite paper are stacked and hot-pressed to form a thick mica shell; a protective gap is formed in a joint position; a mica adhesive tape is initially fixed and forms a double interlayer with the mica shell; and a PI adhesive tape is wound on the outer side to prevent displacement and prevent protection failure, so that the protection function is ensured to be effective from the source, and a foundation is laid for subsequent protection.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of connection row protection in a battery pack PACK, in particular to a high-temperature-resistant high-insulation mica shell structure. BACKGROUND

[0002] In the fields of electricity, automobiles, new energy and the like, a battery pack serves as a core energy storage unit, and the safety performance thereof is directly related to equipment operation stability and personnel life safety. The connection positions between batteries and batteries, between a battery and a module, and between modules are high-risk areas of thermal runaway. When a battery unit fails (such as cracking or high temperature), heat flow is easily diffused through the connection positions, and the risk of current breakdown is significantly increased, which may cause catastrophic damage such as fire and explosion of the entire battery pack.

[0003] The current national standard GB38031 clearly stipulates that a battery system of an electric vehicle needs to meet the requirement of “no fire and no explosion within 5 minutes” when a thermal runaway event occurs, so as to reserve time for safe escape of passengers. This standard puts forward strict high-temperature-resistant and high-insulation performance indexes for the protection structure of the connection positions in the battery pack, and specifically needs to achieve the protection effect of “resisting 10 minutes under a high-temperature environment of 1000 DEG C and no breakdown under a voltage of 1 KVDC”. However, the existing protection schemes for the connection positions of the battery pack have obvious defects. The protection structures such as a silicone sheath and a PA66 plastic shell that are traditionally used have insufficient high-temperature resistance and are easily melted and cracked under an extreme high temperature of 1000 DEG C, and thus cannot block the conduction of heat flow. At the same time, the insulation performance of such protection structures is limited and cannot meet the requirement of no breakdown under a voltage of 1 KVDC, and the adaptability is poor. For special connection positions in the battery pack that are irregular and narrow, the traditional general-purpose protection structures cannot be closely fitted and easily form a protection blind area, leading to the diffusion of the risk of thermal runaway.

[0004] Therefore, the high-temperature-resistant high-insulation mica shell structure is proposed to solve the above problems. SUMMARY

[0005] (I) Technical problems solved In view of the deficiencies of the prior art, the application provides the high-temperature-resistant high-insulation mica shell structure, which solves the problems that the traditional protection structures have insufficient high-temperature resistance and insufficient insulation performance, have poor adaptability to special connection positions in the battery pack and easily form a protection blind area, and thus cannot meet the requirements in the standard GB38031, and further cannot effectively block the diffusion of thermal runaway.

[0006] (II) Technical scheme In order to achieve the above object, the application provides the following technical scheme: a high-temperature-resistant and high-insulation mica shell structure, comprising a mica shell, a mica tape and a PI polyimide tape, the mica shell is made of thin mica paper which is stacked in multiple layers and then put into a special-shaped mold for hot pressing, and the thickness of the formed mica shell is 0.9 mm; the mica shell is first assembled on an injection molded shell, and then fixed in a specified protection position in the battery pack by the mica tape and the PI polyimide tape; the structure can meet the requirements of high-temperature resistance and high insulation without breakdown at 1000 DEG C, 10 min and 1 KVDC.

[0007] Preferably, the thin mica paper is phlogopite material, and the thickness of a single layer of thin mica paper is 0.15 mm.

[0008] Preferably, the mica tape uses natural phlogopite as the base material, and the base material is covered with high-strength alkali-free glass fiber cloth on both sides, and the surface of the alkali-free glass fiber cloth is uniformly coated to form a high-temperature silicone layer.

[0009] Preferably, the PI polyimide tape has the properties of high viscosity, high temperature resistance and high insulation, and is attached to the outside of the mica tape to form a reinforced fixation of the mica shell.

[0010] Preferably, the fixing method of the mica shell includes scheme A, and the operation steps of the scheme A are: first, the mica shell is preliminarily fixed by winding the mica tape around the mica shell twice, and then the mica shell is secondarily fixed by winding the PI polyimide tape around the mica shell twice; this scheme can ensure that the mica shell remains stable in position under high-temperature environment when the battery cell fails.

[0011] Preferably, the fixing method of the mica shell includes scheme B, which applies a fixing force to the mica shell in two different directions at the same time to prevent the mica shell from losing protection function due to position movement when the battery pack fails.

[0012] Preferably, the mica shell includes multiple structure types, and the mica shell has different structures when assembled on the outside surface of the part at the position that needs protection, such as a first mica shell, a second mica shell, a third mica shell and a fourth mica shell, etc., and different structure types are adapted to different installation positions in the battery pack; wherein, the mica shells with similar structures are provided with marks for identification.

[0013] Preferably, the specified protection position includes the connection between the batteries, the connection between the battery and the module, the connection between the modules, and other special positions in the battery pack that are not suitable for thermal protection.

[0014] Preferably, the mica shell can block the heat propagation inside the battery pack, thereby preventing the risks of short circuit and power failure in the battery pack when the battery fails; the structure is suitable for battery pack protection scenarios in the fields of electrical, automotive and new energy.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a high-temperature resistant and highly insulating mica shell structure, which has the following beneficial effects: 1. This high-temperature resistant and high-insulation mica shell structure is based on material compatibility, structural protection, and fixed security. Following the prevention-interception-redundancy protection approach, it selects phlogopite as raw material, utilizing its high-temperature resistance and high insulation properties to adapt to thermal runaway scenarios. Thin phlogopite paper is stacked in multiple layers and hot-pressed into a thick mica shell, which is then bonded to the connection points to protect the gaps. The mica tape is initially cured and forms a double layer with the mica shell. PI tape is wrapped around the outside to prevent displacement and prevent protection failure, ensuring that the protection function is effective from the source and laying a reliable foundation for subsequent protection.

[0016] 2. This high-temperature resistant and high-insulation mica shell structure maximizes component performance through layered assembly and precise positioning: first, the mica shell is installed on the injection-molded shell to prevent physical damage; then, mica tape is used for initial fixation and to block heat and electricity; finally, PI tape is used for reinforcement and fixation, forming a composite structure that achieves multi-layer protection. In the event of thermal runaway, the mica shell blocks heat flow and prevents diffusion, the triple insulation layer prevents short circuits, and the double-layer tape ensures positional stability, effectively controlling the range of thermal runaway, providing sufficient escape time for occupants, and significantly reducing the risk of personal injury and property loss.

[0017] 3. This high-temperature resistant and high-insulation mica shell structure features differentiated fixing schemes designed for different scenarios: Scheme A uses two turns of mica tape + two turns of PI tape, leveraging the high-temperature silicone layer and high viscosity to resist high-temperature expansion forces; Scheme B provides bidirectional fixing, balancing material deformation and viscosity decay caused by thermal aging. Scheme A prevents mica shell displacement under high temperatures, while Scheme B avoids protection failure during long-term use, ensuring stable protection throughout the battery pack's entire life cycle, eliminating the need for frequent maintenance, and reducing operating costs.

[0018] 4. This high-temperature resistant and high-insulation mica shell structure allows for customized mica shell molds based on the size and shape of the connection points for difficult-to-protect locations. Hot-press molding ensures a tight, gapless wrapping. Similar mica shell markings prevent misalignment during assembly, and double-layer tape fixation ensures that blind spots meet protection standards. This avoids blind spots caused by size and shape mismatches in traditional protection, achieving full protection without dead angles at all battery pack connection points, and ensuring that all connection points have the same level of protection. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mica shell structure of this application; Figure 2 This is a schematic diagram of the mica shell structure and added markings in this application; Figure 3 This is a schematic diagram showing the designated location and fixing method for the mica shell protection in this application; Figure 4 This is a schematic diagram showing the designated location and reinforced fixing method for the mica shell protection in this application; Figure 5 This is a schematic diagram showing the installation position and assembly of the mica shell structure in this application.

[0020] In the diagram: 1. First mica shell; 2. Second mica shell; 3. Third mica shell; 4. Fourth mica shell; 5. Mica tape; 6. PI polyimide tape. Detailed Implementation

[0021] 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-5 As shown, a high-temperature resistant and high-insulation mica shell structure includes a mica shell, mica tape 5, and PI polyimide tape 6. The mica shell is made by hot pressing multiple layers of thin mica paper into a mold of a specific shape, resulting in a thickness of 0.9 mm after molding. The mica shell is first assembled onto an injection-molded shell, and then fixed in a designated protective position inside the battery pack by the mica tape 5 and PI polyimide tape 6. This structure can meet the requirements of high temperature resistance and high insulation at 1000℃, 10 min, and 1KVDC without breakdown.

[0023] First, the thin mica paper is made of phlogopite mica, and the thickness of a single layer of thin mica paper is 0.15mm. By selecting phlogopite mica, a material with natural high temperature resistance and high electrical insulation properties, and combining it with a single layer thickness of 0.15mm, the flexibility of a single sheet of mica paper is ensured, and the foundation is laid for the subsequent hot pressing process. After multiple layers are stacked, they can be integrated into a whole through hot pressing, ultimately forming a mica shell with uniform thickness and dense structure. This achieves the core protection effect of not melting or cracking in high temperature environments, while blocking current breakdown, meeting the basic protection requirements in battery pack thermal runaway scenarios.

[0024] Secondly, the mica tape 5 uses natural phlogopite as its base material. High-strength alkali-free fiberglass cloth is laminated on both sides of the base material, and a high-temperature silicone layer is uniformly coated on the surface of the alkali-free fiberglass cloth. Through this composite structure design of natural phlogopite base material + double-sided alkali-free fiberglass cloth + high-temperature silicone layer, on the one hand, the phlogopite base material continues its high-temperature resistance and high insulation properties, forming a protective synergy with the mica shell; on the other hand, the alkali-free fiberglass cloth significantly improves the tensile strength and structural stability of the tape, preventing tearing at high temperatures; simultaneously, the uniformly coated high-temperature silicone layer ensures that the tape maintains stable adhesion even at extreme temperatures of 1000℃, achieving reliable initial fixation of the mica shell and assisting in blocking heat flow and current conduction, avoiding the lack of single-function fixation or single-function protection.

[0025] Furthermore, the PI polyimide tape 6 possesses high viscosity, high temperature resistance, and high insulation properties. When bonded to the outside of the mica tape 5, it provides reinforced fixation to the mica shell. By utilizing the triple core properties of PI polyimide tape 6—high viscosity, high temperature resistance, and high insulation—and its design of being bonded to the outside of the mica tape 5, on the one hand, double fixation is achieved through strong adhesion, preventing the mica shell from shifting under conditions such as high-temperature expansion and vehicle vibration, ensuring the protective position remains unchanged. On the other hand, its high insulation performance serves as a redundant protective layer for the mica shell and mica tape 5, ensuring that even if the preceding protective layer suffers minor damage, the 1KVDC non-breakdown requirement is still met, completely avoiding the risk of single-protection failure.

[0026] Furthermore, the method of fixing the mica shell includes scheme A; The operation steps of Scheme A are as follows: First, use mica tape 5 to wrap around the mica shell twice for initial fixation, and then use PI polyimide tape 6 to wrap around the mica shell twice for secondary fixation. This scheme can ensure that the mica shell remains stable in the high-temperature environment when the battery unit fails. The step-by-step wrapping operation of two wraps of mica tape 5 for initial fixation and two wraps of PI polyimide tape 6 for secondary fixation, with a clear design of the number of wraps, ensures that, on the one hand, the high-temperature silicone layer of mica tape 5 forms a basic fixing force at high temperature, preventing the mica shell from shifting in the early stage of thermal runaway; on the other hand, the high viscosity of PI polyimide tape 6 further enhances the fixing strength, offsetting the thermal expansion thrust of the battery and module at high temperature, achieving the effect of double fixing force superposition. Ultimately, it ensures that when the battery unit fails and causes a 1000°C high-temperature impact, the mica shell always fits tightly in the protective position, without shifting or falling off, and continues to perform its thermal blocking and insulation functions.

[0027] The method of fixing the mica shell includes scheme B; Solution B applies a fixing force to the mica shell simultaneously in two different directions to prevent the protective function from failing due to the mica shell shifting after the battery pack experiences thermal failure.

[0028] Furthermore, the mica shell incorporates various structural types. Different structures are used when the mica shell is assembled on the outer surface of components requiring protection, such as the first mica shell 1, the second mica shell 2, the third mica shell 3, and the fourth mica shell 4. These different structural types are adapted to different installation positions within the battery pack. Mica shells with similar structures have distinguishing markings on their surfaces. The design, which applies force simultaneously in two different directions, overcomes the limitations of traditional single-direction fixing. On one hand, it balances the non-uniform stress caused by thermal failure after long-term use of the battery pack, preventing the mica shell from shifting due to insufficient force in one direction. On the other hand, the bidirectional fixing forms a closed-loop force system, stably constraining the mica shell in the protected position. This ensures that even after long-term temperature cycling and material aging, the mica shell remains in place, preventing displacement and detachment from the protected area, thus guaranteeing the effectiveness of protection throughout the battery pack's entire lifespan.

[0029] Furthermore, the designated protection locations include the connections between batteries, between batteries and modules, between modules, and other special locations within the battery pack that are unsuitable for thermal protection. Customized solutions with various structural types, such as the first mica shell 1 and the second mica shell 2, are designed based on the size and shape of different protection locations within the battery pack. This ensures that each type of mica shell fits tightly to its corresponding protection location without gaps or looseness. Simultaneously, differentiating markings are set on the surfaces of mica shells with similar structures. Through visual differentiation, the corresponding models can be quickly identified during assembly, avoiding misalignment due to structural similarities. This ensures precise matching between the protective structure and the protection location, improving assembly efficiency and accuracy.

[0030] Finally, the mica shell can block heat propagation inside the battery pack, thereby preventing risks such as short circuits and power outages after thermal runaway. This structure is suitable for battery pack protection scenarios in the electrical, automotive, and new energy fields. By clearly defining the critical paths of heat flow and current conduction at the battery-battery, battery-module, and module-module connections, as well as special locations that are difficult to cover by traditional protection, such as irregular interfaces and narrow gaps, all are included in the designated protection scope. On the one hand, key connection paths are given priority protection to block the core diffusion channels during thermal runaway; on the other hand, special blind spots are given supplementary protection to avoid protection loopholes caused by poor adaptability of traditional protection. Ultimately, it achieves the effect of covering all high-risk locations inside the battery pack without any protection blind spots, comprehensively reducing the risk of thermal runaway propagation and short circuits.

[0031] The working principle of this application's mica shell structure revolves around the core logic of material property adaptation + structural design protection + fixing scheme assurance. Through the collaboration of multiple components, it achieves thermal blocking and insulation protection at the battery pack connection points. The overall logic follows a three-layer design approach of prevention-blocking-redundant protection. In use, material selection and process design focus on three core requirements: high temperature resistance, high insulation, and strong fixing, providing essential support for subsequent protective functions. Phlogopite is used as the raw material, utilizing its natural high temperature resistance and high electrical insulation properties to fundamentally meet the protection requirements for battery pack thermal runaway scenarios. Secondly, a single layer of 0.1... Multiple layers of 5mm thin phlogopite paper are stacked and thermo-pressed using a specific mold, ensuring high-temperature resistance. The thermo-pressing process ensures the mica shell conforms precisely to the shapes of different connection points within the battery pack, achieving accurate wrapping and avoiding protective gaps. When the mica tape 5 is used for initial fixation and auxiliary protection, natural phlogopite is used as the base material, with high-strength alkali-free fiberglass cloth laminated on both sides. A high-temperature silicone layer is evenly coated on the cloth surface. This initial fixation between the mica shell and the injection-molded shell is achieved through wrapping, while simultaneously utilizing the insulating and high-temperature resistant properties of the phlogopite base material to form a double thermal and electrical resistance barrier, reducing the need for insulation. To prevent leaks, PI polyimide tape 6, possessing three major characteristics—high viscosity, high temperature resistance, and high insulation—is wrapped around the outside of mica tape 5. It not only prevents the mica shell from shifting under high temperature and vibration through strong adhesion but also serves as a redundant insulation layer, ensuring that the 1KVDC non-breakdown requirement is still met in extreme scenarios. This avoids single-protection failure and prevents protection failure due to insufficient high temperature resistance or insulation performance of the material leading to thermal runaway, as well as protection gaps caused by loose adhesion between the mica shell and the connection point resulting in heat flow and current leakage. From the dual dimensions of material inherent properties and structural compatibility, it proactively avoids the fundamental risks of heat conduction and diffusion, and current breakdown. This design lays a reliable core foundation for the entire protection system, ensuring the effectiveness of the protection function from the source. It prevents the mica shell from shifting under high temperature expansion and vibration, ensures that the protective position does not deviate, and continuously plays a blocking role. Ultimately, it achieves no heat diffusion and no electrical short circuit, meets the requirement that the battery system does not catch fire or explode within 5 minutes, reserves escape time for occupants, prevents the mica shell from shifting in the early stage of assembly, and addresses the thermal and electrical conduction loopholes that exist in single mica shell protection. It not only achieves the initial stable fixation of the mica shell, but also enhances the heat blocking and insulation effect through double partitions, further reducing the risk of thermal runaway and short circuit.

[0032] Through layered assembly and precise positioning, the performance of each component is transformed into actual protective effect. The first step involves assembling the thermoformed mica shell onto the injection-molded shell. The injection-molded shell provides basic structural support for the mica shell, preventing direct contact between the mica shell and sharp connectors inside the battery pack, thus preventing physical damage. The second step involves wrapping and securing the mica shell with mica tape 5. The adhesive and protective properties of the tape ensure a tight fit between the mica shell and the injection-molded shell, initially blocking heat and electrical conduction. The third step involves reinforcing the outside of the mica tape 5 with PI polyimide tape 6. High-strength fixing and redundant insulation ensure that the entire structure remains stable and does not fail under extreme environments. This ultimately forms a composite structure of injection-molded shell support + mica shell core protection + double-layer tape fixation, achieving multi-layered protection: physical protection, thermal blocking, electrical insulation, and stable fixation. When a battery cell malfunctions and causes thermal runaway, the first layer blocks heat flow: the mica shell directly blocks high-temperature flames and heat flow, utilizing phlogopite mica... The high-temperature resistance of the mica shell allows it to withstand a 1000℃ high-temperature impact for 10 minutes, preventing heat flow from being conducted to adjacent batteries and modules and preventing the spread of thermal runaway. The second layer blocks current: the mica shell + mica tape 5 + PI polyimide tape 6 form a triple insulation layer, blocking the current path between the faulty battery and other components, preventing short circuits. The third layer ensures positional stability: the strong fixing effect of the double-layer tape prevents thermal runaway from spreading rapidly from a single faulty battery to the entire battery pack, leading to large-scale fires and explosions; at the same time, it prevents the faulty battery from forming a current path with surrounding components, causing short circuits and exacerbating the hazards of thermal runaway. It also prevents the mica shell from shifting due to high-temperature expansion and vibration, thus losing its thermal blocking and insulation functions. The layered blocking of heat flow and current, while ensuring the positional stability of the protective structure, effectively controls the range of thermal runaway, meets the safety requirement of "the battery system will not catch fire or explode within 5 minutes", and provides sufficient escape time for passengers, significantly reducing the risk of personal injury and property damage.

[0033] To address the risks associated with different battery pack usage scenarios, differentiated fixing solutions are designed to ensure effective protection. Solution A: Stable fixing against high-temperature impact: A wrapping method of two turns of mica tape 5 + two turns of PI polyimide tape 6 is used. The high-temperature silicone layer of mica tape 5 does not lose its adhesiveness at 1000℃, providing initial fixation for the mica shell. The high viscosity of PI polyimide tape 6 further enhances the fixing strength, counteracting the thermal expansion force at high temperatures, ensuring the mica shell does not shift and maintaining its protective shape. Solution B: Positional protection against long-term thermal aging: Simultaneous fixing in two directions is employed, using multiple... The directional force balance design mitigates material deformation and viscosity degradation caused by thermal aging, preventing the degradation of adhesive tape and slight deformation of the mica shell and injection molded shell due to environmental temperature cycles and material aging during long-term battery pack use. This prevents the mica shell from shifting, increasing protective gaps, and ultimately losing its protective function. The multi-directional force design offsets the negative effects of thermal aging, avoiding insufficient fixing force caused by material aging in a single direction. This ensures that the mica shell remains in an effective protective position throughout the entire battery pack lifecycle, guaranteeing protective stability during long-term use without frequent maintenance or replacement, thus reducing operating costs.

[0034] For locations within the battery pack that are difficult to thermally protect, a customized structure and precise assembly solve the problem of traditional protection. Molds of corresponding shapes are designed based on the size and shape of different connections within the battery pack, and thermoforming is used to create a suitable mica shell. This ensures the mica shell tightly wraps around these special locations without any protective gaps. Markings are made on the surfaces of mica shells with similar structures to ensure precise alignment during assembly, avoiding misalignment caused by structural similarities. These special locations are often weak points for heat flow and current. The customized design of the mica shell allows for all-around wrapping, combined with double-layer adhesive tape for fixation, ensuring that even these blind spots meet the requirements of 1000℃, 10min, and 1KVDC without breakdown. This achieves comprehensive protection for all connections within the battery pack, preventing blind spots created by traditional protection methods due to shape and size mismatches that cannot fit irregular or narrow connections within the battery pack. The customized mica shell achieves "precise wrapping" of these special locations, completely filling the blind spots of traditional protection and ensuring that all connections within the battery pack have the same level of protection.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the statement "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A high-temperature resistant and highly insulating mica shell structure, characterized in that: The structure includes a mica shell, mica tape (5), and PI polyimide tape (6). The mica shell is made by hot pressing multiple layers of thin mica paper into a mold of a specific shape, and the thickness after molding is 0.9 mm. The mica shell is first assembled on the injection molded shell, and then fixed in the designated protection position inside the battery pack by the mica tape (5) and PI polyimide tape (6). This structure can meet the requirements of high temperature resistance and high insulation without breakdown at 1000℃, 10min, and 1KVDC. The mica shell has different structures when assembled on the outer surface of the parts that need to be protected.

2. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The thin mica paper is made of phlogopite mica, and the thickness of a single layer of thin mica paper is 0.15 mm.

3. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The mica tape (5) uses natural phlogopite as the base material. The base material is covered with high-strength alkali-free glass fiber cloth on both sides, and the surface of the alkali-free glass fiber cloth is uniformly coated to form a high-temperature silicone layer.

4. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The PI polyimide tape (6) has high viscosity, high temperature resistance and high insulation properties, and it is attached to the outside of the mica tape (5) to form a reinforced fixation for the mica shell.

5. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The method of fixing the mica shell includes scheme A; The operation steps of the scheme A are as follows: first, use mica tape (5) to wrap around the mica shell twice for initial fixation, and then use PI polyimide tape (6) to wrap around the mica shell twice to complete the secondary fixation; this scheme can ensure that the mica shell remains stable in the high temperature environment when the battery unit fails.

6. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The method of fixing the mica shell includes scheme B; Solution B applies a fixing force to the mica shell simultaneously in two different directions to prevent the mica shell from losing its protective function due to displacement after the battery pack experiences thermal failure.

7. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The mica shell includes various structural types, such as the first mica shell (1), the second mica shell (2), the third mica shell (3), and the fourth mica shell (4). Different structural types are adapted to different installation positions in the battery pack. Among them, the mica shells with similar structures have markings on their surfaces for differentiation.

8. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The designated protection locations include the connections between batteries, the connections between batteries and modules, the connections between modules, and other special locations within the battery pack where thermal protection is not suitable.

9. The high-temperature resistant and high-insulation mica shell structure according to claim 1, characterized in that: The mica shell can block heat transmission inside the battery pack, thereby preventing risks such as short circuits and power outages in the battery pack after thermal runaway. This structure is suitable for battery pack protection scenarios in the electrical, automotive, and new energy fields.

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