A fixing structure and a battery module

Abstract

The application discloses a fixing structure and a battery module, and relates to the technical field of batteries. The fixing structure comprises a fixing ring, which is used for fixing a battery core group into a stable battery module around the periphery of the battery core group; and an insulating belt, which is wound around the fixing ring to form an insulating covering layer covering at least a position on the fixing ring, which is in contact with the battery core group. The application forms a stable battery module structure by surrounding the battery core group with the fixing ring, and covers at least the position on the fixing ring, which is in contact with the battery core group, with the insulating belt, so that the electrical contact risk between the conductive part and the battery core can be effectively isolated, the possibility of short circuit or electrical failure is reduced, and the overall insulating safety performance of the battery module is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a fixed structure and a battery module. Background Technology

[0002] In thermal batteries, steel strips are typically used as support and insulation between cells, while heat shrink tubing is now commonly used for insulation protection. For example, Teflon sheets are applied first, followed by heat shrink tubing; or mica sheets are applied first, followed by heat shrink tubing; or ceramic silicone sheets are applied first, followed by heat shrink tubing; or fiberglass tubing is used directly, etc.

[0003] However, heat shrink tubing requires high-temperature baking to shrink, a process that is difficult and complex to control. Furthermore, heat shrink tubing is prone to uneven shrinkage, leading to insulation defects. In addition, heat shrink materials may age and crack during long-term high-temperature use, affecting reliability and resulting in low production efficiency and high costs for the heat shrinking process.

[0004] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute relevant technology currently known to those skilled in the art. Utility Model Content

[0005] This application provides a fixing structure and a battery module to solve the problems of poor reliability and high cost of heat shrink tubing and its baking process.

[0006] The technical solution adopted in this application is as follows:

[0007] In a first aspect, this application provides a fixing structure, including:

[0008] The retaining ring is used to secure the battery cell assembly into a stable battery module by wrapping around its perimeter.

[0009] Insulating tape is wrapped around the fixing ring to form an insulating cover layer that at least covers the contact area between the fixing ring and the battery cell assembly.

[0010] The fixing structure provided in this application uses an insulating tape wrapped around a fixing ring to form an insulating covering layer. Compared with the existing heat shrink tubing solution, it does not require a high-temperature baking process, avoids insulation defects caused by uneven shrinkage of the tubing, and solves the problem of easy aging and cracking of heat shrink materials during long-term high-temperature use. It effectively improves the insulation reliability and production efficiency of the thermal battery, and reduces process complexity and production cost.

[0011] In conjunction with the first aspect, in one possible implementation, the insulating tape is wound around the fixing ring in a spiral manner, and adjacent winding loops of the insulating tape partially overlap to form a stacked structure.

[0012] This application uses insulating tape to spirally wrap around a fixing ring and forms a stacked structure by partially stacking adjacent wrapping loops. This effectively avoids gaps between insulation layers, further strengthens the integrity of the insulation structure, enhances the reliability and stability of the insulation layer, and ensures the continued effectiveness of the insulation layer during long-term use.

[0013] In conjunction with the first aspect, in one possible implementation, the ratio of the width of the stacked structure to the width of the insulating strip is less than 1 / 2;

[0014] And / or, the ratio of the thickness of the stacked structure to the thickness of the insulating tape is greater than or equal to 1.2 and less than or equal to 1.9.

[0015] This application ensures that the thickness of the stacked structure is appropriate and not excessively stacked by setting the ratio range of the width and thickness of the stacked structure. This guarantees stable and reliable insulation performance while avoiding the adverse effects of uneven thickness, thereby improving the consistency of the winding process and the overall quality of the insulation cover.

[0016] In conjunction with the first aspect, in one possible implementation, the insulating tape is wound in a spiral manner around the fixing ring, with the edges of adjacent winding loops of the insulating tape seamlessly aligned.

[0017] This application achieves seamless alignment of the edges of adjacent winding loops of the insulating tape, avoiding unevenness on the surface of the insulation layer and providing a smoother and more uniform insulation layer surface. This enhances the mechanical stability and appearance quality of the insulation layer, while also avoiding potential electrical breakdown hazards caused by gaps.

[0018] In conjunction with the first aspect, in one possible implementation, the winding direction of a single loop of the insulating tape forms an angle between the width direction of the fixing ring and the winding direction of the loop, with the angle being between 45° and 70°.

[0019] This application ensures that the insulating tape fits tightly against the fixing ring during winding by setting the angle between the winding direction of a single wrapping loop of the insulating tape and the width direction of the fixing ring to be between 45° and 70°. This avoids problems such as excessive local stress or easy detachment of the insulating tape caused by excessively small or large angles, thereby improving the adhesion performance and long-term reliability of the insulating tape wrapping layer.

[0020] In conjunction with the first aspect, in one possible implementation, the thickness of the insulating strip satisfies the following condition: the ratio of the resistance value in the thickness direction of the insulating strip to the operating voltage of the battery module is greater than or equal to 1000Ω / V.

[0021] Thus, this application can strictly guarantee that the insulating tape has sufficient electrical insulation performance, significantly reducing the risk of electrical breakdown or leakage during battery module operation, and ensuring the safety of the module under high voltage environment.

[0022] In conjunction with the first aspect, in one possible implementation, the thickness of the insulating tape is between 20 and 60 μm.

[0023] This application sets the thickness of the insulating tape in the range of 20 to 60 μm, which is beneficial to provide suitable mechanical strength and electrical performance. At the same time, it avoids the difficulties in winding and forming or excessive space occupation caused by excessive thickness, as well as the insufficient mechanical strength or reduced electrical insulation performance caused by excessive thinness, thus optimizing the overall performance of the insulating cover layer.

[0024] In conjunction with the first aspect, in one possible implementation, the insulating tape is at least one of a polyimide film or a polytetrafluoroethylene film.

[0025] This application uses polyimide film or polytetrafluoroethylene film material, which can provide better high temperature resistance, insulation performance and chemical corrosion resistance, significantly improve the long-term reliability and durability of the insulation tape, and meet the insulation safety requirements of battery modules in complex working environments.

[0026] In conjunction with the first aspect, in one possible implementation, the fixing structure further includes an insulating pad that is fitted to the fixing ring, and an insulating cover layer that covers the insulating pad and the fixing ring.

[0027] This application further enhances the insulation isolation effect between the fixing ring and the battery cell by adding insulating padding material to adhere to the fixing ring, significantly improving the insulation safety margin of the overall structure, avoiding electrical risks caused by the fixing ring potentially coming into direct contact with the battery cell, and improving the overall electrical safety performance of the battery module.

[0028] In conjunction with the first aspect, in one possible implementation, insulating padding is disposed on the side of the retaining ring facing the battery cell;

[0029] And / or, the insulating padding material is one or more of Teflon, mica sheets, and ceramic silicone.

[0030] This application places the insulating pad on the side of the fixing ring facing the battery cell to further enhance the insulation isolation effect between the pad and the battery cell. At the same time, the use of high-performance insulating materials such as Teflon, mica sheets or ceramic silicone can provide the battery cell with stronger electrical isolation, temperature resistance and mechanical buffer protection, further improving the overall safety and operational reliability of the module.

[0031] Secondly, this application also provides a battery module, including a cell assembly and a fixed structure as described in any of the implementations of the first aspect above.

[0032] This application uses an insulating tape wrapped around a fixing ring as an insulation protection method, avoiding the high-temperature baking process used in existing technologies with heat shrink tubing. This solves the problems of uneven shrinkage of heat shrink tubing leading to insulation defects, and the aging and cracking of heat shrink materials under long-term use. This improves the insulation reliability and long-term stability of the battery module, reduces the complexity and cost of the production process, and enhances the overall reliability and production efficiency of the battery module.

[0033] Other advantages, objectives and features of this application will be partly apparent from the description below, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of a fixed structure with a stacked structure provided in an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of a seamless alignment fixing structure provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the winding angle provided in the embodiments of this application. Detailed Implementation

[0038] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0039] The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. In this application, "at least one" means one or more, and "more than one" means two or more. The terms "first," "second," and other ordinal terms used in this application may be used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is solely to distinguish one constituent element from others and should not be construed as indicating or implying relative importance. For example, without departing from the scope of this application, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0040] Each circuit or other component may be described or referred to as "for" performing one or more tasks. In this context, "for" is used to imply a structure by indicating that the circuit / component includes a structure (e.g., a circuit system) that performs one or more tasks during operation. Therefore, even when the specified circuit / component is currently inoperable (e.g., not turned on), it can still be referred to as "for performing that task." Circuits / components used with the term "for" include hardware, such as circuits that perform operations.

[0041] Before introducing the embodiments of this application, the technical terms and background technology involved in this application will be introduced first.

[0042] Existing thermal battery steel strip insulation protection solutions typically employ a combination of materials such as Teflon, mica sheets, or ceramic silicone with heat-shrink tubing, or directly use fiberglass tubing for insulation protection. While these solutions offer some insulation performance, the heat-shrink tubing requires high-temperature baking and shrinkage, a complex process that is difficult to control and prone to uneven insulation layer thickness or even insulation defects. Furthermore, heat-shrink materials are susceptible to aging and cracking under prolonged high-temperature conditions, leading to reduced insulation performance and reliability. This further increases the production cost and process complexity of the thermal battery, limiting its long-term stable and reliable operation.

[0043] In summary, the existing thermal battery steel strip insulation protection schemes suffer from poor reliability and high cost. To address these issues, this application provides a fixing structure that resolves the problems of poor reliability and high cost associated with existing solutions.

[0044] Please see Figure 1 , Figure 1 A schematic diagram of a fixed structure with a stacked structure provided in an embodiment of this application is shown.

[0045] like Figure 1 As shown, the fixing structure includes a fixing ring 100 and an insulating strip 200.

[0046] A retaining ring 100 is used to secure the battery cell assembly into a stable battery module by wrapping around its perimeter. The shape of the retaining ring 100 is related to the shape of the battery cell assembly to be secured, and the material of the retaining ring 100 can be, but is not limited to, carbon steel, stainless steel, nylon, polycarbonate, glass fiber, etc. For example, if the battery cell assembly is rectangular, the retaining ring 100 can be made of rectangular steel strip.

[0047] Insulating tape 200 is wound around fixing ring 100 to form an insulating cover layer that at least covers the contact area between fixing ring 100 and the battery cell assembly. Alternatively, the insulating tape 200 can be understood as wrapping multiple turns around fixing ring 100 until it at least covers the contact area between fixing ring 100 and the battery cell assembly; the completed insulating tape 200 forms an insulating cover layer. It is understood that the figure shows the state during the winding process and does not show the complete insulating cover layer.

[0048] This fixing structure uses an insulating tape 200 wrapped around a fixing ring 100 to form an insulating covering layer. Compared with the existing heat shrink tubing solution, it does not require a high-temperature baking process, avoids insulation defects caused by uneven shrinkage of the tubing, and solves the problem of easy aging and cracking of heat shrink materials during long-term high-temperature use. It effectively improves the insulation reliability and production efficiency of the thermal battery, and reduces process complexity and production cost.

[0049] In some embodiments, the insulating tape 200 may be wound in a spiral manner around the retaining ring 100, but is not limited to that used in some embodiments.

[0050] In some embodiments, to achieve the effect of at least covering the contact position between the retaining ring and the battery cell assembly, adjacent winding loops of the insulating tape 200 are partially stacked to form a stacked structure, i.e., the winding method of the insulating tape 200 is selected as follows: Figure 1 Stacked and wrapped in.

[0051] In some embodiments, the edges of adjacent loops of the insulating tape 200 are seamlessly aligned, as can be seen here. Figure 2 , Figure 2 A schematic diagram of a seamless alignment fixing structure provided in an embodiment of this application is shown. Figure 2 As shown, the insulating tape 200 continues to wrap multiple times around the fixing ring 100 until it at least covers the position on the fixing ring 100 that contacts the battery cell assembly, forming an insulating covering layer. It is worth noting that at this point, there are no gaps or overlapping areas between adjacent turns of the insulating tape 200 wrapped around the fixing ring 100, i.e., they are seamlessly aligned.

[0052] In some embodiments, see Figure 1In a fixed structure with a stacked structure, the ratio of the width of the stacked structure to the width of the insulating tape 200 is less than 1 / 2, meaning the width of the stacked structure is less than half the width of the insulating tape 200. This saves costs and prevents excessive stacking from affecting the insulation performance of the insulating tape 200. This implementation method, by setting a range for the ratio of the width to the thickness of the stacked structure, ensures that the thickness of the stacked structure is appropriate and not excessively stacked. While guaranteeing stable and reliable insulation performance, it avoids the adverse effects of uneven thickness, achieving better insulation results.

[0053] In some embodiments, in a fixed structure with a stacked structure, the ratio of the thickness of the stacked structure to the thickness of the insulating tape 200 is greater than or equal to 1.2 and less than or equal to 1.9. Because the insulating tape 200 partially overlaps with adjacent loops during spiral winding to form a stacked structure, a structure of two layers of insulating tape 200 partially superimposed is formed in this stacked structure. Ideally, the thickness of the two layers of insulating tape 200 after stacking is exactly twice the thickness of a single layer of insulating tape 200. However, in practical applications, due to factors such as the force, elastic compression, tension during winding, material thickness deviation, and material flexibility of the insulating tape 200, the actual measured thickness after stacking usually does not reach the theoretical twice the thickness, but is slightly less than twice. Therefore, the ratio of the thickness d1 of the stacked structure to the thickness d2 of the insulating tape 200 can be set to 1.2 ≤ d1 / d2 ≤ 1.9 based on practical experience. A ratio between 1.2 and 1.9 reflects an appropriate compressive deformation state of the stack, which is a reasonable range in practical applications.

[0054] This range effectively avoids excessive thickness deviations or overly thick areas resulting from double the thickness, which could lead to structural inhomogeneity and affect the overall bonding effect. Simultaneously, it avoids insufficient insulation performance caused by an excessively small overlap ratio. This range ensures moderate thickness variation, contributing to the overall flatness, uniformity, and structural stability of the insulation layer, guaranteeing the reliability of the battery module during long-term use. This implementation method, by strictly setting the thickness ratio of the stacked structure (1.2–1.9), ensures that the 200mm overlap area of ​​the insulation tape effectively increases the local insulation thickness, enhances the electrical insulation performance of local areas, and avoids local insulation reduction caused by winding gaps or defects, thereby improving the overall electrical safety of the insulation cover layer. Furthermore, setting the ratio range between 1.2 and 1.9 makes the production process easier to control, allowing on-site production personnel or automated equipment to wind the tape with appropriate tension and clamping force, ensuring product quality stability and consistency, reducing manufacturing difficulty, and improving production efficiency.

[0055] In some embodiments, the winding direction OA of a single loop of the insulating tape 200 forms an angle with the width direction OB of the retaining ring 100, the angle being between 45° and 70°. (See here for more details.) Figure 3 , Figure 3 A schematic diagram of the winding angle provided in an embodiment of this application is shown. For example... Figure 3 As shown, 1-1 represents one side of the first turn of insulating tape 200 wound from left to right, and 1-2 represents the other side of the first turn of insulating tape 200; similarly, 2-1 represents one side of the second turn of insulating tape 200 wound from left to right, and 2-2 represents the other side of the second turn of insulating tape 200; 3-1 represents one side of the third turn of insulating tape 200 wound from left to right, and 3-2 represents the other side of the third turn of insulating tape 200. That is to say, when winding the fixing ring 100, the insulating tape 200 is not completely along the width direction OB (i.e., the included angle is 0°), but is wound in a spiral at a certain angle. This angle is the angle formed between the winding direction OA of the insulating tape 200 and the width direction OB of the fixing ring 100. Therefore, based on practical experience, the value of this angle can be set between 45° and 70°, representing that the insulating tape 200 is wound around the fixing ring 100 in a moderately inclined spiral manner.

[0056] Since both excessively small and excessively large angles can lead to weak adhesion or easy loosening of the wrapping tape, setting the angle between 45° and 70° ensures both the locking effect of the wrapping layer in the width and length directions. This allows the insulating tape 200 to better adhere to the surface of the fixing ring 100 and prevents it from loosening or shifting during long-term use. Simultaneously, a reasonable tilt angle makes it easier for the insulating tape 200 to evenly cover the entire surface of the fixing ring 100, reducing wrinkles or gaps during the wrapping process and ensuring a uniform and flat insulation layer, thus effectively preventing the formation of weak points in the insulation. Furthermore, spiral winding at a suitable angle disperses the stress on the tape, allowing the insulating tape 200 to form a stable structure on the surface of the fixing ring 100, avoiding mechanical stress concentration in one direction, and improving mechanical stability and tensile strength.

[0057] In this way, by setting the included angle range (45°~70°), it can be ensured that the insulating tape 200 is evenly and tightly attached to the surface of the fixing ring 100 after winding, preventing the risk of loosening and falling off due to vibration, impact, or thermal expansion and contraction during use, and maintaining good insulation protection continuously. Setting a reasonable angle range makes it easier to control the winding effect when using automated production equipment or manual operation, reducing winding difficulties or high defect rates caused by excessively large or small angles, and improving production stability and efficiency.

[0058] In some embodiments, to meet the insulation requirements after battery thermal runaway, according to GB / T36276-2023, with a fixed length and width of the insulating strip 200, the thickness of the insulating strip 200 is set to satisfy the following: the ratio of the resistance R of the insulating strip 200 in its thickness direction to the operating voltage U of the battery module, R / U, is ≥ 1000Ω / V. Here, the resistance of the insulating strip 200 in its thickness direction refers to the resistance measured along the thickness direction of the insulating strip 200 (from one surface of the insulating strip 200 to the other); the operating voltage of the battery module refers to the voltage value of the battery module during normal operation. That is, if the operating voltage of the battery module is high, the corresponding insulating strip 200 material must have a correspondingly higher insulation resistance to ensure sufficient insulation safety margin. For example, for a 400V battery module, the resistance of the insulating strip 200 in its thickness direction is at least 400kΩ or higher; for an 800V battery module, the resistance of the insulating strip 200 in its thickness direction is at least 800kΩ or higher.

[0059] This ensures that the selected insulating material has sufficient insulation properties in the thickness direction, avoiding the risk of insulation breakdown or leakage under normal or transient operating conditions of the battery module, and enhancing the reliability and safety of the battery system.

[0060] In some embodiments, the thickness of the insulating tape 200 should not be less than 20 μm; otherwise, problems such as insufficient mechanical strength, reduced insulation performance, or increased construction difficulty may occur. At the same time, the thickness of the insulating tape 200 should not exceed 60 μm; otherwise, the insulating tape 200 may be too thick, affecting overall space utilization efficiency, construction convenience, and cost control.

[0061] This ensures that the insulating tape 200 has sufficient thickness to provide stable and reliable insulation performance, reducing the risk of short circuits, leakage, or insulation breakdown. It avoids the mechanical fragility problems caused by an excessively thin insulating tape 200, making it less prone to damage or wear during long-term use, thus extending the battery module's lifespan and stability. Furthermore, choosing an appropriate thickness avoids increased costs due to excessive material thickness, and also avoids potential costs associated with maintenance, repairs, or safety accidents caused by insulation failure.

[0062] In some embodiments, the substrate of the insulating tape 200 shall be selected from at least one of the following two materials:

[0063] Polyimide (PI) film: Polyimide film is a high-performance polymer material with extremely high insulation properties, high temperature resistance (typically able to withstand temperatures above 200℃), excellent mechanical strength, good chemical resistance, and flame retardancy. Polyimide film is commonly used in the insulation protection field of the electronics and electrical industries.

[0064] Polytetrafluoroethylene (PTFE) membrane: Polytetrafluoroethylene membrane, commonly known as Teflon membrane, has excellent electrical insulation properties, excellent chemical corrosion resistance, high thermal stability (wide operating temperature range), good flame retardancy, and extremely low surface friction coefficient. It is widely used in electrical insulation and corrosion resistance fields.

[0065] For example, both polyimide and polytetrafluoroethylene (PTFE) films possess excellent electrical insulation properties, effectively preventing insulation breakdown or leakage, thereby enhancing the safety and long-term reliability of the battery module. Polyimide films exhibit extremely high thermal stability and temperature resistance, while PTFE films also have a wide operating temperature range. Using one or a combination of these materials can effectively address potential high-temperature environments within the battery module (such as battery overheating or thermal runaway), preventing high-temperature failure of the insulation material.

[0066] Thus, the high mechanical strength, tear resistance, and abrasion resistance of the above-mentioned membrane materials ensure that the insulating tape 200 is not easily damaged during long-term use and production construction, thereby extending the product's service life. It is understandable that polyimide film, polytetrafluoroethylene film, or combinations thereof can be flexibly selected based on specific design requirements, cost control, processing technology, and application scenarios to optimize the overall performance and cost balance.

[0067] In some embodiments, the fixing structure provided in this application may further include an insulating pad, making the fixing structure a three-layer structure, consisting of: a fixing ring 100 (typically a conductive metal material, such as a rectangular steel strip) → insulating pad → insulating cover layer (such as a PI film) from the inside out. The shape and size of the insulating pad are adapted to the fixing ring 100, allowing it to completely conform to the side of the fixing ring 100. The insulating cover layer covers both the insulating pad and the fixing ring 100.

[0068] For example, the insulating pad is an insulating material disposed on the fixing ring 100, which typically has good electrical insulation, mechanical cushioning properties, or flexibility, and can be an alumina ceramic sheet, an aluminum nitride ceramic sheet, a boron nitride ceramic sheet, a calcium silicate board, a quartz glass sheet, or other similar materials. The insulating pad being attached to the fixing ring 100 means that the insulating pad is in close contact with, adheres to, or covers the surface of the fixing ring 100, so as to form a stable integral structure together with the fixing ring 100 for insulation or mechanical cushioning.

[0069] In this way, the electrical insulation level of the fixing ring 100 can be significantly enhanced by the design of the double-layer insulation structure (insulating pad material + insulating cover layer), effectively preventing short circuits, leakage and electric shock accidents. The bonding setting of the insulating pad material and the overall covering structure of the insulating cover layer reduce the production difficulty and improve the product quality stability and production efficiency.

[0070] In some embodiments, in the three-layer fixing structure described above, an insulating pad can be disposed on the side of the fixing ring 100 facing the battery cell. The insulating pad can be one or more of Teflon, mica sheet, and ceramic silicone.

[0071] For example, Teflon, mica sheets, and ceramic silicone can all provide effective insulation protection between the battery cell and the fixing ring 100. For extremely high temperature resistance, flame retardancy, and rigid support, mica insulating sheets are recommended; for high flexibility, ease of processing, and excellent electrical insulation, Teflon is recommended; and for a balance of electrical insulation and heat dissipation, ceramic silicone is recommended. In actual selection, one or more materials can be flexibly chosen in combination based on the specific operating requirements of the battery cell module (such as electrical performance, thermal management, safety, and flexibility) to optimize the safety, reliability, and long-term stability of the battery module.

[0072] In this way, by placing the insulating pad on the side of the fixing ring 100 facing the battery cell, the insulation, short circuit prevention and thermal protection between the battery cell and the fixing ring 100 can be achieved. Furthermore, by selecting one or more of Teflon, mica sheets and ceramic silicone as the insulating pad, the safety, reliability and heat dissipation performance of the battery module can be effectively improved.

[0073] Based on the same technical concept, this application also provides a battery module, including a cell assembly and the fixing structure described in any of the above implementations. This battery module, by using a combination of a fixing ring 100 and an insulating strip 200 to form a reliable insulating covering layer, effectively prevents displacement of the cell assembly and short-circuit risks, significantly improves the structural stability, electrical safety, and insulation performance of the battery module, and optimizes the production and assembly process, thereby enhancing the overall safety, reliability, and service life of the battery module.

[0074] It should be noted that the order of description of the embodiments in this application is not intended as a setting of the priority of the embodiments.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application and in its specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0076] It should be noted that, unless otherwise specified, the term "connected" or "linked" in this application includes not only directly connecting two entities, but also indirectly connecting them through other entities that have beneficial improvement effects.

[0077] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many forms under the guidance of this application without departing from the spirit and scope of protection of the claims. All equivalent transformations made under the inventive concept of this application using the content of this application's specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A fixing structure characterized by comprising: The application relates to a fixing structure of a battery module. The fixing structure comprises: a fixing ring for fixing the battery module around the periphery of the battery cell group; 2. The fixing structure according to claim 1, characterized in that, an insulating tape wound around the fixing ring to form an insulating covering layer covering at least the position of the fixing ring in contact with the battery cell group.

3. The fixture of claim 2, wherein The insulating tape is wound around the fixing ring in a spiral manner, and adjacent winding turns of the insulating tape are partially stacked to form a stacking structure. The ratio of the width of the stacking structure to the width of the insulating tape is less than 1 / 2.

4. The fixture of claim 1, wherein And / or, the ratio of the thickness of the stacking structure to the thickness of the insulating tape is greater than or equal to 1.2 and less than or equal to 1.

9.

5. The fixture of any one of claims 2-4, wherein, The insulating tape is wound around the fixing ring in a spiral manner, and the edges of adjacent winding turns of the insulating tape are seamlessly aligned.

6. The fixture of claim 1, wherein The insulating tape forms an included angle between the winding direction of a single winding turn and the width direction of the fixing ring, and the included angle is between 45 degrees and 70 degrees.

7. The fixture of claim 1, wherein The thickness of the insulating tape satisfies that the ratio of the resistance value in the thickness direction of the insulating tape to the working voltage of the battery module is greater than or equal to 1000 ohms per volt.

8. The fixture of claim 1, wherein The thickness of the insulating tape is between 20 and 60 micrometers.

9. The fixture of claim 1, wherein The insulating tape is at least one of a polyimide film or a polytetrafluoroethylene film.

10. The fixture of claim 9, wherein The fixing structure further comprises an insulating pad, and the insulating pad is arranged in close contact with the fixing ring, and the insulating covering layer covers the insulating pad and the fixing ring. The insulating pad is arranged on the side of the fixing ring facing the battery cell.

11. A battery module, characterized by And / or, the insulating pad is one or more of Teflon, mica sheet and ceramic silica gel. The application further relates to a battery module comprising a battery cell group and the fixing structure according to any one of claims 1 to 10.

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