Battery module fixing structure and battery module

Abstract

This application provides a battery module fixing structure and a battery module. The battery module fixing structure includes a metal strip and an insulating kit. The two ends of the metal strip overlap to form a frame structure, and the insulating kit covers the metal strip. The insulating kit includes a temperature-resistant insulating layer and a limiting insulating layer. The temperature-resistant insulating layer covers the metal strip, and the limiting insulating layer covers the temperature-resistant insulating layer, thus fixing the temperature-resistant insulating layer to the metal strip. The temperature resistance rating of the temperature-resistant insulating layer is higher than that of the limiting insulating layer. By setting two insulating layers, the temperature resistance of the battery module fixing structure is increased, ensuring that the insulation withstand voltage of the fixing structure remains within a safe range even after thermal runaway of the battery cell.

Description

Technical Field

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

[0002] Battery modules are typically composed of multiple cells. To prevent cells from shifting within the battery module during transportation or use, different cells are fixed in different ways when forming the module. For prismatic or pouch batteries, a fixing structure is needed to bundle and secure multiple cells together.

[0003] To ensure strength, the mounting structure is typically made of highly conductive metal. Therefore, an insulating layer is placed on the mounting structure to prevent the exposed metal from directly contacting the metal casing of the battery module or battery pack. However, in related technologies, if the battery cell experiences abnormally high temperatures, this insulating layer may melt and fail, resulting in poor reliability. Utility Model Content

[0004] The embodiments of this application provide a battery module fixing structure and a battery module to solve the problem that the insulating layer on the battery module fixing structure may melt and fail at high temperatures in related technologies.

[0005] To solve the above problems, the technical solution provided in this application is as follows:

[0006] In a first aspect, this application provides a battery module fixing structure, comprising: a metal strip with its two ends overlapping to form a frame structure; and an insulating kit covering the metal strip; wherein the insulating kit comprises: a heat-resistant insulating layer covering the metal strip; and a limiting insulating layer covering the heat-resistant insulating layer to fix the heat-resistant insulating layer to the metal strip; the temperature resistance level of the heat-resistant insulating layer is greater than that of the limiting insulating layer.

[0007] The above solution allows the high-temperature resistant insulating layer to directly contact the metal strip, which helps resist abnormally high temperatures. Furthermore, the high-temperature resistant insulating layer has a higher temperature resistance rating than the limiting insulating layer, thus preventing the limiting insulating layer from melting at high temperatures and preventing direct exposure of the metal conductor. At the same time, the use of the limiting insulating layer ensures that the high-temperature resistant insulating layer can be firmly and uniformly attached to the surface of the metal strip, preventing displacement and loosening of the high-temperature resistant insulating layer during manufacturing, assembly, or use. This solves the problem of poor adhesion of the high-temperature resistant material and improves the safety and reliability of the battery module.

[0008] In one embodiment, the temperature resistance rating of the heat-resistant insulation layer is greater than or equal to 500°C.

[0009] Using a temperature-resistant insulation layer with a temperature rating of 500 degrees Celsius or higher can withstand most of the extreme high-temperature impacts in the early stages of thermal runaway, preventing the insulation kit from melting and exposing the metal strip. Even if the limiting insulation layer melts, the temperature-resistant insulation layer can still maintain its complete structure and continuously isolate the metal strip and high-voltage components.

[0010] In one embodiment, the heat-resistant insulating layer includes any one or more combinations of an alumina ceramic layer, a ceramic silica gel layer, a ceramic fiber layer, and a mica layer.

[0011] The temperature resistance of the above materials can basically reach the peak temperature when the battery cell is thermally runaway, which can effectively ensure that the metal strip is still wrapped by the temperature-resistant insulation layer under extreme conditions, greatly improving the safety of the battery module.

[0012] In one embodiment, the limiting insulation layer is a heat-shrinkable insulation material layer.

[0013] Heat-shrinkable insulation materials can shrink radially by 50% to 70% when heated, thus forming a gapless wrap around the heat-resistant insulation layer and preventing displacement of the heat-resistant insulation layer under vibration or expansion.

[0014] In one embodiment, the thickness of the limiting insulating layer ranges from 0.8 mm to 1.5 mm.

[0015] The thickness of the limiting insulation layer is kept within this range, which ensures the structural strength of the limiting insulation layer while ensuring that the temperature-resistant insulation layer can be reliably fixed, and also ensures that the limiting insulation layer has a certain ability to repeatedly and uniformly shrink.

[0016] In one embodiment, the thickness of the limiting insulating layer is 1 mm.

[0017] This design ensures the basic function of the limiting insulation layer while also taking into account heat dissipation efficiency and deformation resistance, and will reduce the volume ratio of the insulation system to a certain extent, which is conducive to achieving the lightweight requirements of the battery module.

[0018] In one embodiment, the thickness of the heat-resistant insulating layer ranges from 0.3 mm to 1.5 mm.

[0019] Setting the thickness of the heat-resistant insulation layer to 0.3mm to 1.5mm, while ensuring a balance between material processing limits and thermal management, is beneficial for achieving a multiple balance between insulation protection, lightweighting, and thermal runaway prevention.

[0020] In one embodiment, the thickness of the heat-resistant insulating layer ranges from 0.3 mm to 0.5 mm.

[0021] By setting the thickness of the heat-resistant insulation layer within this range, greater space utilization and thermal response can be achieved, while also ensuring the reliability of the insulation.

[0022] In one embodiment, the metal strip includes a first strip body, a second strip body, a third strip body, and a fourth strip body; wherein the first strip body and the third strip body are parallel to each other, the second strip body and the fourth strip body are parallel to each other, the connection points at both ends of the metal strip body are located on the first strip body, and the insulating kit is disposed on the second strip body, the third strip body, and the fourth strip body of the metal strip body.

[0023] This design achieves insulation of the three parts of the metal strip, with the reserved first strip body used to ensure reliable connection of the metal strip, which helps to achieve a balance between electrical protection and manufacturing convenience.

[0024] In one embodiment, exposed corner areas are provided between the first belt body and the second belt body, between the second belt body and the third belt body, between the third belt body and the fourth belt body, and between the fourth belt body and the first belt body.

[0025] By rounding the corners of the frame formed by the metal strip, stress concentration points are eliminated, and the stress state is shifted from localized abrupt changes to a smooth distribution. This significantly improves the fatigue resistance of the metal strip and suppresses crack formation without the need for additional materials. It should be noted that the corner areas are exposed, allowing for free stress release. Furthermore, through careful design, the corner areas do not touch other parts of the battery module, but rather form a gap, thus providing a certain degree of air insulation.

[0026] Secondly, this application provides a battery module, including: a plurality of battery cells connected and fixed together to form a battery cell unit; and a fixing structure sleeved on the battery cell unit; wherein the fixing structure adopts the battery module fixing structure described in any of the foregoing embodiments.

[0027] By adopting the aforementioned fixed structure, the safety and reliability of the battery module can be improved.

[0028] In one embodiment, the battery module further includes an end plate disposed between a first strip of the metal strip and the battery cell, and a third strip of the metal strip and the battery cell, wherein the length of the insulating kit located on the third strip is less than or equal to the width of the end plate.

[0029] By setting an end plate between the fixing structure and the battery cell 20, the fixing structure can use the positioning structure on the end plate 30 to bind the entire battery module 1, avoiding stress concentration during the binding and fixing process and preventing the battery cell 20 from being punctured. It also helps to constrain the expansion direction of the battery cell 20. The length of the insulating kit on the third belt is less than or equal to the width of the end plate, which helps to avoid damage to the insulating kit caused by hard contact between the edge of the end plate and the insulating kit.

[0030] In one embodiment, the length of the insulating sleeve disposed on the second and fourth strips of the metal strip satisfies: L S -2*T EP -2mm≤L Insul ≤L S -2*T EP +2mm, where L S T is the length of the second belt body. EP The thickness of the end plate is given.

[0031] With this setup, when the battery cell expands during charging and discharging, the covering insulation kit can fully withstand the tension, preventing the battery cell from shifting, and the exposed part of the metal strip also facilitates stress release.

[0032] This application provides a battery module fixing structure, including a metal strip and an insulating kit. The two ends of the metal strip overlap to form a frame structure, and the insulating kit covers the metal strip. The insulating kit includes a temperature-resistant insulating layer and a positioning insulating layer. The temperature-resistant insulating layer covers the strip, and the positioning insulating layer covers the temperature-resistant insulating layer to fix the temperature-resistant insulating layer to the strip. The temperature resistance of the temperature-resistant insulating layer is higher than that of the positioning insulating layer. By providing two insulating layers, the temperature resistance of the battery module fixing structure is increased, ensuring that the insulation withstand voltage of the fixing structure remains within a safe range even after thermal runaway of the battery cell. Attached Figure Description

[0033] 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 accompanying 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.

[0034] Appendix Figure 1 This is a schematic diagram of the battery module fixing structure in the embodiments of this application;

[0035] Appendix Figure 2 This is a cross-sectional view of the battery module fixing structure in an embodiment of this application.

[0036] Appendix Figure 3 This is a side view of the battery module in an embodiment of this application;

[0037] Appendix Figure 4 This is a top view of the battery module in an embodiment of this application;

[0038] Appendix Figure 5 This is a side view of the battery module from another perspective in an embodiment of this application.

[0039] 1. Battery module; 10. Battery module fixing structure; 20. Battery cell; 30. End plate; 100. Metal strip; 110. First strip body; 120. Second strip body; 130. Third strip body; 140. Fourth strip body; 200. Insulation kit; 210. Temperature resistant insulation layer; 220. Limiting insulation layer. Detailed Implementation

[0040] 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 scope of protection of this application.

[0041] It will be understood that the terms “comprising” and / or “including” as used herein specify the presence of the said feature or component, but do not exclude the presence or addition of one or more other features or components.

[0042] To meet the energy and voltage requirements of some electrical devices, power battery systems typically contain hundreds or even thousands of cells. Directly assembling these cells in groups would be inconvenient for manufacturing and maintenance. Therefore, power battery systems are composed of single or multiple battery boxes. Each battery box consists of several battery modules, which in turn consist of several cells. Different cells are secured using different methods when forming modules. For prismatic or pouch batteries, a fixing structure is usually used to secure the battery modules.

[0043] After the battery cells are stacked into a battery module, the battery module maintains a certain size under the pressure of the pressurizing equipment. The fixing structure binds the entire module through the positioning structure on the end plate. Finally, the battery module is baked to fix it, so that the cells are bonded and fixed together. The cells of each module are bound together with the fixing structure, which not only facilitates assembly, but also accommodates the expansion phenomenon of the cells during charging and discharging.

[0044] As batteries age, the cells will experience increased internal resistance and reduced heat dissipation, causing the cell temperature to rise during battery operation. In addition, if the charging voltage exceeds the cell's maximum charging voltage or is lower than the cell's minimum discharge voltage during use, the cell is also very likely to experience abnormally high temperatures.

[0045] In related technologies, an insulating layer is installed on the fixing structure of the battery module. However, under the abnormally high temperature of the battery cell as described above, this insulating layer may melt, potentially causing the fixing structure and the battery cell to loosen. This could lead to displacement of the battery cell under the high pressure generated by the expansion of internal gas. The displacement and the resulting mutual compression of the battery cell casings can easily break, causing more serious internal short circuits. Furthermore, after the insulating layer melts, the exposed metal fixing structure itself is highly conductive. An exposed fixing structure spanning multiple battery cells could simultaneously cause short circuits at multiple locations, releasing enormous energy instantaneously and causing serious accidents such as explosions.

[0046] Reference Figure 1 As shown, according to a first aspect of this application, a battery module fixing structure is provided, including a metal strip 100 and an insulating kit 200. The two ends of the metal strip 100 overlap to form a frame structure, and the insulating kit 200 covers the metal strip 100. Specifically, the metal strip 100 can be a rectangular frame structure, etc., and different frame structures can be selected according to different battery modules; this application does not impose any limitations on this.

[0047] In some embodiments of this application, the metal strip 100 is mainly made of materials such as 65Mn and stainless steel. The 65Mn metal strip 100 can be connected by a snap-fit ​​method, while the stainless steel metal strip 100 can be connected by a snap-fit ​​or resistance welding method. When the metal strip 100 is connected by welding, the two ends of the metal strip 100 can be welded together.

[0048] Reference Figure 2As shown, specifically, the insulation kit 200 includes a heat-resistant insulation layer 210 and a limiting insulation layer 220. The heat-resistant insulation layer 210 is sleeved on the surface of the metal strip 100, and the limiting insulation layer 220 covers the outer surface of the heat-resistant insulation layer 210, allowing the heat-resistant insulation layer 210 to be fixed to the metal strip 100. It should be noted that the temperature resistance rating of the heat-resistant insulation layer 210 is higher than that of the limiting insulation layer 220. Through the above scheme, the heat-resistant insulation layer 210, which has high-temperature insulation function, is in direct contact with the metal strip 100, which is beneficial for resisting abnormal high temperatures. Furthermore, the higher temperature resistance rating of the heat-resistant insulation layer than that of the limiting insulation layer prevents the limiting insulation layer from melting at high temperatures, thus preventing direct exposure of the metal conductor. At the same time, the use of the limiting insulation layer 220 ensures that the heat-resistant insulation layer 210 can be firmly and uniformly attached to the surface of the metal strip 100, preventing the heat-resistant insulation layer 210 from shifting or loosening during manufacturing, assembly, or use, and solving the problem of poor adhesion of heat-resistant materials.

[0049] It should be noted that the temperature-resistant insulation layer 210 and the limiting insulation layer 220 of this application can be installed on the metal strip 100 before the metal strip 100 is bundled onto the battery cell 20. First, the metal strip 100 is cut to the required length, and then the temperature-resistant insulation layer 210 is inserted into the required position. Then, a limiting insulation layer 220 is inserted around the temperature-resistant insulation layer 210 to limit the temperature-resistant insulation layer 210.

[0050] In some embodiments of this application, the heat-resistant insulation layer 210 is made of a material with a temperature resistance rating greater than or equal to 500 degrees Celsius. It should be noted that during thermal runaway of the cell 20, the local temperature can instantly surge to 600 degrees Celsius or higher. The heat-resistant insulation layer 210, with a temperature resistance rating greater than or equal to 500 degrees Celsius, can withstand most of the extreme high-temperature impacts in the initial stages of thermal runaway, preventing the insulation kit 200 from melting and exposing the metal strip 100. Even if the limiting insulation layer 220 melts, the heat-resistant insulation layer 210 can still maintain its intact structure, continuously isolating the metal strip 100 and high-voltage components. Although in some cases the thermal runaway temperature may exceed 500 degrees Celsius, every extra bit of time gained increases the probability that the Battery Management System (BMS) will trigger fuse protection or activate the cooling system.

[0051] Optionally, in some more specific embodiments, the heat-resistant insulation layer 210 includes any one or more combinations of an alumina ceramic layer, a ceramic silicone layer, a ceramic fiber layer, and a mica layer. The alumina ceramic has a melting point exceeding 2050 degrees Celsius and a temperature resistance rating of up to 1200 degrees Celsius, exhibiting extremely high hardness and compressive strength. The ceramic silicone has a temperature resistance rating of up to 800 degrees Celsius and excellent elasticity and tear resistance. The ceramic fiber has a decomposition temperature exceeding 1400 degrees Celsius and extremely high tensile strength. The mica has a decomposition temperature exceeding 1000 degrees Celsius, and its layered structure gives it a certain degree of flexibility. The temperature resistance of these materials can essentially reach the peak temperature during thermal runaway of the battery cell 20, effectively ensuring that the metal strip 100 remains encased by the heat-resistant insulation layer 210 under extreme conditions, greatly improving the safety of the battery module 1. Optionally, in some embodiments of this application, the above materials can also be used to form a multi-layer composite heat-resistant insulation layer 210 to obtain even better temperature resistance.

[0052] It should be noted that in the above embodiments, a high melting point does not necessarily mean high reliability. Temperature resistance rating reflects a material's ability to maintain its function at high temperatures, while melting point only indicates the critical point at which the material's physical state changes. Furthermore, decomposition temperature can serve as a preliminary basis for material selection; specific material selection requires long-term temperature resistance testing.

[0053] In some embodiments of this application, the limiting insulation layer 220 is a heat-shrinkable insulation material. The radial shrinkage rate of the heat-shrinkable insulation material during heating can reach 50% to 70%, thereby forming a gapless cover tightly against the heat-resistant insulation layer 210 and preventing displacement of the heat-resistant insulation layer 210 under vibration or expansion. Optionally, the limiting insulation layer 220 can be made of materials such as cross-linked polyolefin, PVDF, fluororubber (FKM), modified polyester (PET), or polyetheretherketone (PEEK), among which polyetheretherketone (PEEK) has the best insulation performance and the highest melting temperature.

[0054] In addition, in some embodiments of this application, the limiting insulation layer 220 can also be monitored by the battery management system, for example, by detecting the degree of shrinkage and deformation of the limiting insulation layer 220 by a differential pressure sensor, so as to provide early warning of abnormal temperature of the cell 20.

[0055] In some embodiments of this application, the overall thickness of the limiting insulation layer 220 ranges from 0.8 mm to 1.5 mm. Maintaining its thickness within this range ensures the structural strength of the limiting insulation layer while reliably fixing the temperature-resistant insulation layer, and also ensures that the limiting insulation layer has a certain ability to repeatedly and uniformly shrink.

[0056] More specifically, in some embodiments of this application, the overall thickness of the limiting insulation layer 220 is 1mm. This design ensures the basic functions of the limiting insulation layer 220 while taking into account heat dissipation efficiency and deformation resistance, and will reduce the volume ratio of the insulation system to a certain extent, which is conducive to achieving the lightweight requirements of the battery module.

[0057] Optionally, in some embodiments of this application, the thickness of the heat-resistant insulation layer 210 ranges from 0.3 mm to 1.5 mm. Specifically, the thickness of the heat-resistant insulation layer 210 can be 0.3 mm, 0.5 mm, 0.6 mm, 1.0 mm, 1.2 mm, or 1.5 mm. It should be noted that the thinner the heat-resistant insulation layer 210, the smaller its space ratio, which is beneficial for heat dissipation of the battery cell 20. The thicker the heat-resistant insulation layer 210, the higher its compressive strength, which is more conducive to withstanding the expansion of the battery cell 20. Setting the thickness of the heat-resistant insulation layer 210 to 0.3 mm to 1.5 mm, while ensuring a balance between material processing limits and thermal management, is beneficial for achieving a multiple balance effect of insulation protection, lightweighting, and thermal runaway prevention of the heat-resistant insulation layer 210. In some more specific embodiments, the thickness of the heat-resistant insulation layer 210 can be in the range of 0.3 mm to 0.5 mm. By setting the thickness of the heat-resistant insulation layer 210 within this range, a larger space utilization and thermal response can be obtained, while also ensuring insulation reliability.

[0058] In summary, the overall thickness of the insulating kit 200 can be 1.1mm to 1.7mm. In this case, the thickness of the heat-resistant insulation layer 210 is 0.3mm to 0.7mm, and the thickness of the limiting insulation layer is 0.8mm to 1.0mm. Specifically, the heat-resistant insulation layer and the limiting insulation layer in the insulating kit can be a combination of mica and polyolefin. In this case, the insulating kit 200 is thinner, which will have lower thermal resistance, which is beneficial for accelerating heat dissipation under normal operating conditions and preventing the formation of heat accumulation areas between the battery cells 20. Optionally, the thickness of the insulating kit 200 can also be 1.7mm to 2.4mm. In this case, the thickness of the heat-resistant insulation layer 210 is 0.7mm to 1.1mm, and the thickness of the limiting insulation layer is 1.0mm to 1.3mm, using a combination of ceramic fiber and fluororubber. This ensures that the insulating kit 200 occupies a small space while also accommodating a certain degree of expansion of the battery cells 20. Alternatively, the thickness of the insulating kit 200 can be 2.4 mm to 3.0 mm. In this case, the thickness of the heat-resistant insulating layer 210 is 1.1 mm to 1.5 mm, and the thickness of the limiting insulating layer is 1.3 mm to 1.5 mm. Using a combination of alumina ceramic and PVDF results in a thicker layer, allowing the insulating kit 200 to provide a longer heat conduction path, which helps reduce the temperature rise rate of the heat-resistant insulating layer 210 under abnormally high temperatures. Depending on the battery type, such as lithium iron phosphate energy storage batteries, ternary lithium power batteries, and solid-state battery modules 1, the thickness of the insulating kit 200 can be designed differently, which will not be elaborated upon here.

[0059] Reference Figure 1 As shown, in some embodiments of this application, the metal strip 100 includes a first strip body 110, a second strip body 120, a third strip body 130, and a fourth strip body 140; wherein, the first strip body 110 and the third strip body 130 are parallel to each other, the second strip body 120 and the fourth strip body 140 are parallel to each other, the connection points at both ends of the metal strip 100 are located on the first strip body 110, and the insulating kit 200 is disposed on the second strip body 120, the third strip body 130, and the fourth strip body 140 of the metal strip 100. Through this arrangement, insulation is achieved for the three parts of the metal strip 100, and the reserved first strip body 110 is used to ensure the reliable connection of the metal strip 100, which is conducive to achieving a balance between electrical protection and manufacturing convenience.

[0060] It should be noted that insulation is only provided in three parts of the metal strip 100. Except for the reserved first strip body 110, which requires welding or other methods to form a frame structure, the first strip body 110 typically does not have current-carrying components such as copper busbars in its location within the battery module, therefore insulation is unnecessary, which can reduce costs to some extent. It is understood that insulation may be provided at this location in some cases, and this application does not limit its application.

[0061] Optionally, in some embodiments of this application, exposed corner areas are provided between the first belt body 110 and the second belt body 120, between the second belt body 120 and the third belt body 130, between the third belt body 130 and the fourth belt body 140, and between the fourth belt body 140 and the first belt body 110. By setting the corners of the frame formed by the metal belt body 100 as rounded corners, it is beneficial to eliminate stress concentration points and to shift the stress state from local abrupt changes to a smooth distribution. Without adding other materials, the fatigue resistance of the metal belt body 100 can be significantly improved, and crack initiation can be suppressed.

[0062] Reference Figure 3 As shown, according to a second aspect of this application, a battery module 1 is provided, including a plurality of battery cells 20 and a fixing structure. The plurality of battery cells 20 are interconnected and fixed together to form a battery cell 20 unit. The fixing structure is sleeved on the battery cell 20 unit. The fixing structure adopts the fixing structure of the battery module 1 of any of the aforementioned embodiments. Therefore, the battery module 1 also has all the beneficial effects of the aforementioned fixing structure, which will not be elaborated here.

[0063] Reference Figure 4 As shown, in some embodiments of this application, the battery module 1 further includes an end plate 30, disposed between the first strip 110 of the metal strip 100 and the battery cell 20, and disposed between the third strip 130 of the metal strip 100 and the battery cell 20. Through this scheme, the fixing structure can use the positioning structure on the end plate 30 to bind the entire battery module 1, avoiding stress concentration during the binding process and preventing puncture of the battery cell 20. Simultaneously, the end plate 30, disposed between the fixing structure and the battery cell 20, also helps to constrain the expansion direction of the battery cell 20. Furthermore, the end plate 30 can protect the internal battery cells from external environmental influences such as physical impact, moisture, and dust; and has a heat dissipation function, helping to maintain a suitable temperature for the battery module and prevent overheating. Based on this, the length L of the insulating kit 200 located on the second strip 120 and the fourth strip 140 is... Insul Satisfy: L S -2*T EP -2mm≤L Insul ≤L S -2*T EP +2mm, where LS is the length of the second belt body (120), T EP The thickness of the end plate 30 is such that, with this setting, when the battery cell expands during charging and discharging, the covering insulation kit can fully withstand the tension, preventing the battery cell from shifting, and the exposed part of the metal strip is also conducive to stress release.

[0064] In addition, refer to Figure 5As shown, the length L1 of the insulating kit 200 located on the third belt body 130 is less than or equal to the width l1 of the end plate 30. The length of the insulating kit 200 on the third belt body 130 being less than or equal to the width of the end plate helps to avoid damage to the insulating kit caused by hard contact between the edge of the end plate 30 and the insulating kit 200.

[0065] In summary, although the present application has disclosed the preferred embodiments as described above, the above preferred embodiments are not intended to limit the present application. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be determined by the scope defined in the claims.

Claims

1. A battery module fixing structure, characterized in that, include: Metal strips, with overlapping ends forming a frame structure; An insulating kit is wrapped around the metal strip. The insulating kit includes: A heat-resistant insulating layer is fitted onto the surface of the metal strip; A limiting insulation layer is wrapped around the outer surface of the heat-resistant insulation layer to fix the heat-resistant insulation layer onto the metal strip. The temperature resistance rating of the heat-resistant insulation layer is greater than that of the limiting insulation layer.

2. The battery module fixing structure according to claim 1, characterized in that, The temperature resistance rating of the heat-resistant insulation layer is greater than or equal to 500℃.

3. The battery module fixing structure according to claim 1, characterized in that, The heat-resistant insulating layer includes any one or more combinations of alumina ceramic layer, ceramic silica gel layer, ceramic fiber layer and mica layer.

4. The battery module fixing structure according to claim 1, characterized in that, The limiting insulation layer is a heat-shrinkable insulation material layer.

5. The battery module fixing structure according to claim 1, characterized in that, The thickness of the limiting insulating layer ranges from 0.8 mm to 1.5 mm.

6. The battery module fixing structure according to claim 5, characterized in that, The thickness of the limiting insulation layer is 1 mm.

7. The battery module fixing structure according to claim 1, characterized in that, The thickness of the heat-resistant insulation layer ranges from 0.3 mm to 1.5 mm.

8. The battery module fixing structure according to claim 7, characterized in that, The thickness of the heat-resistant insulation layer ranges from 0.3 mm to 0.5 mm.

9. The battery module fixing structure according to claim 1, characterized in that, The metal strip includes a first strip body, a second strip body, a third strip body, and a fourth strip body; Wherein, the first belt body and the third belt body are parallel to each other, the second belt body and the fourth belt body are parallel to each other, the connection points at both ends of the metal belt body are located on the first belt body, and the insulating kit is disposed on at least one of the second belt body, the third belt body and the fourth belt body of the metal belt body.

10. The battery module fixing structure according to claim 9, characterized in that, Exposed bend areas are provided between the first belt body and the second belt body, between the second belt body and the third belt body, between the third belt body and the fourth belt body, and between the fourth belt body and the first belt body.

11. A battery module, characterized by include: Multiple battery cells are interconnected and fixed together to form a battery cell unit; A fixed structure is fitted onto the battery cell unit; The fixing structure adopts the battery module fixing structure according to any one of claims 1 to 10.

12. The battery module of claim 11, wherein, include: The battery module also includes an end plate disposed between the first strip of the metal strip and the battery cell, and a third strip of the metal strip and the battery cell, wherein the length of the insulating kit disposed on the third strip is less than or equal to the width of the end plate.

13. The battery module according to claim 12, characterized in that, The length L of the insulating kit disposed on the second and fourth belts of the metal strip is [missing information]. Insul Satisfy: L S -2*T EP -2mm≤L Insul ≤L S -2*T EP +2mm, where L S T is the length of the second belt body. EP The thickness of the end plate.

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