High-safety cylindrical lithium battery roll core

Abstract

The utility model relates to a cylindrical lithium battery roll core with high safety, which comprises a roll core body and a protective film sleeved on the periphery of the roll core body, the protective film comprises a first film layer and a second film layer which are laminated, one surface of the first film layer, which is deviated from the second film layer, is adhered to the outer side wall of the roll core body, and the other surface of the first film layer is adhered to the outer side wall of the roll core body. Insulating spacers are arranged at the two ends of the roll core body respectively, the edges of the insulating spacers extend outwards to form extension parts, and the extension parts abut against the ends of the second film layer. According to the utility model, all-directional protection is provided for the roll core body, and the safety performance of the battery is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a high-safety cylindrical lithium battery core. Background Technology

[0002] During use, the internal core of a lithium battery is easily affected by the external environment. External impacts such as heavy impacts or punctures can cause varying degrees of damage to the internal core structure of the lithium battery, thereby affecting the battery's safety performance. Utility Model Content

[0003] The purpose of this invention is to provide a high-safety cylindrical lithium battery core that provides all-round protection for the core body and greatly improves the safety performance of the battery.

[0004] A high-safety cylindrical lithium battery core includes a core body and a protective film sleeved on the outer periphery of the core body. The protective film includes a first film layer and a second film layer stacked together. The side of the first film layer facing away from the second film layer is adhered to the outer side wall of the core body. Insulating pads are respectively provided at both ends of the core body. The edges of the insulating pads extend outward to form extension portions, and the extension portions abut against the ends of the second film layer.

[0005] In the above technical solution, the first film layer serves to isolate the core body from the second film layer. When the core body is subjected to external impact, such as a heavy impact or needle puncture, the external force acts on the second film layer and deforms it. The force generated by the deformation of the second film layer first acts on the first film layer, reducing the conductivity of the impacting object, such as the needle head, without affecting the internal core body. This effectively prevents short circuits in the electrode sheets inside the core body, avoiding battery combustion or even explosion, and greatly improving battery safety performance. The insulating gaskets located at both ends of the core body not only provide electrical insulation but also prevent direct impact from external forces on the ends of the core body. In addition, the edges of the insulating gaskets extend outward to form extensions that abut against the ends of the second film layer, thereby forming a stable structure with the second film layer, increasing the structural stability at both ends of the core body, and further improving battery safety performance.

[0006] Furthermore, the heights of both the first and second film layers are matched with the height of the core body.

[0007] In the above technical solution, the heights of both the first and second film layers are matched to the core body, ensuring that the core body is fully protected. This prevents external substances (such as moisture, dust, impurities, etc.) from contacting the core body, thereby reducing the risk of battery failure or short circuit.

[0008] Furthermore, the first film layer is an insulating layer.

[0009] In the above technical solution, the first film layer, as an insulating layer, can prevent current from flowing inside the film layer, prevent short circuits, and thus reduce the risk of fire or explosion caused by short circuits.

[0010] Furthermore, the second film layer is a thermally conductive layer.

[0011] In the above technical solution, the second film layer, as a heat-conducting layer, can transfer the heat generated inside the battery in a timely manner, so that the battery's operating temperature is kept within a reasonable range, thereby improving the battery's performance and lifespan.

[0012] Furthermore, an elastic coating is brushed onto the side of the second film layer opposite to the first film layer.

[0013] In the above technical solution, the elastic properties of the elastic coating ensure a tight fit between the core body and the outer shell after the core body is installed.

[0014] Furthermore, the side of the extended portion facing the second film layer is provided with an adhesive coating, which is used to connect the extended portion and the second film layer.

[0015] In the above technical solution, the adhesive coating can tightly connect the extension part and the second film layer together, enhance the structural strength of both ends of the core body, prevent the two from separating under external impact, and thus improve the overall impact resistance.

[0016] Furthermore, the insulating pad is provided with a groove for the tabs on the core body to extend out.

[0017] In the above technical solution, the tabs on the core body pass through the insulating pad through the groove. When the tabs are bent, the insulating pad prevents the tabs from contacting the core body, thus avoiding the tabs from puncturing the core body.

[0018] Furthermore, the groove extends from the edge of the extension toward the interior of the insulating pad.

[0019] In the above technical solution, the tank extends from the edge of the extension portion into the insulating pad, making it easier for assemblers to slide the tabs into the tank from the slot opening, thereby reducing assembly difficulty and error rate.

[0020] Furthermore, the insulating pad is provided with several through holes.

[0021] In the above technical solution, the through holes allow the electrolyte to freely penetrate and distribute inside the battery, ensuring that the core body can be fully immersed in the electrolyte, thereby improving the battery's charge and discharge efficiency and cycle life.

[0022] Compared with existing technologies, the beneficial effects of this invention are as follows: The first film layer serves to isolate the core body from the second film layer. When the core body is subjected to external impact, such as a heavy impact or needle puncture, the external force acts on the second film layer and deforms it. The force generated by the deformation of the second film layer first acts on the first film layer, reducing the conductivity of the impacting object, such as the needle head, and will not affect the internal core body. This effectively prevents short circuits in the electrode sheets inside the core body, avoiding battery combustion or even explosion, and greatly improving battery safety performance. The insulating gaskets located at both ends of the core body not only provide electrical insulation but also prevent direct impact from external forces on both ends of the core body. In addition, the edges of the insulating gaskets extend outward to form extensions that abut against the ends of the second film layer, thereby forming a stable structure with the second film layer, increasing the structural stability at both ends of the core body, and further improving battery safety performance. Attached Figure Description

[0023] Figure 1 This is a cross-sectional schematic diagram of a high-safety cylindrical lithium battery core according to an embodiment of the present invention.

[0024] Figure 2 This is a perspective view of the insulating pad according to an embodiment of the present invention.

[0025] Figure 3 This is a perspective view of a high-safety cylindrical lithium battery core according to an embodiment of the present invention.

[0026] Figure 4 This is a perspective view of the insulating pad from another angle in an embodiment of the present invention.

[0027] Explanation of icon numbers

[0028] 1. The core body;

[0029] 2. Protective film; 201. First film layer; 202. Second film layer;

[0030] 3. Insulating gasket; 301. Extension section; 301. Groove; 302. Through hole. Detailed Implementation

[0031] The high-safety cylindrical lithium battery core of this utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0032] Please refer to Figures 1 to 3In a preferred embodiment, the high-safety cylindrical lithium battery core of the present invention includes a core body 1 and a protective film 2 sleeved on the outer periphery of the core body 1. The protective film 2 includes a first film layer 201 and a second film layer 202 stacked together. The side of the first film layer 201 facing away from the second film layer 202 is bonded to the outer side wall of the core body 1. Insulating pads 3 are respectively provided at both ends of the core body 1. The edge of the insulating pad 3 extends outward to form an extension portion 301, and the extension portion 301 abuts against the end of the second film layer 202.

[0033] In practical applications, the first film layer 201 isolates the core body 1 from the second film layer 202. When the core body 1 is subjected to external impact, such as a heavy impact or needle puncture, the external force acts on the second film layer 202 and deforms it. The force generated by the deformation of the second film layer 202 first acts on the first film layer 201, reducing the conductivity of the impacting object, such as the needle head, without affecting the internal core body 1. This effectively prevents short circuits in the electrode sheets inside the core body 1, avoiding battery combustion or even explosion, and greatly improving battery safety performance. In other words, the first film layer 201 and the second film layer 202 give the core body 1 good mechanical properties and impact resistance. The insulating gaskets 3 located at both ends of the core body 1 not only provide electrical insulation but also prevent direct impact from external forces on both ends of the core body 1. In addition, the edge of the insulating pad 3 extends outward to form an extension portion 301, which abuts against the end of the second film layer 202, thereby forming a stable structure with the second film layer 202, increasing the structural stability of both ends of the core body 1, and further improving the safety performance of the battery.

[0034] Please refer to this again. Figure 1 In some embodiments of this utility model, the second film layer 202 has a hollow cylindrical structure, allowing the second film layer 202 to surround the core body 1, thereby covering the core body 1 with the second film layer 202. The first film layer 201 is located inside the second film layer 202 and is bonded to the core body 1, thus the second film layer 202 serves to isolate the core body 1 from the second film layer 202.

[0035] It should be noted that in some embodiments of this utility model, the heights of the first film layer 201 and the second film layer 202 are matched with the height of the core body 1. During battery use, the core body 1 may be subjected to various forces (such as vibration, impact, etc.), and the presence of the first film layer 201 and the second film layer 202 can provide it with additional support and protection, preventing it from deforming or being damaged. Setting the heights of the first film layer 201 and the second film layer 202 to match the core body 1 ensures that the core body 1 can receive all-round protection, thereby reducing the risk of battery failure or short circuit.

[0036] Specifically, in some embodiments of this utility model, the first film layer 201 is an insulating layer. When the battery is subjected to external impact or vibration, the insulating layer can absorb part of the impact force, preventing damage to the electrical components inside the battery. As an insulating layer, the first film layer 201 can also prevent current from flowing inside the protective film 2, preventing short circuits and thus reducing the risk of fire or explosion caused by short circuits. The second film layer 202 is a thermally conductive layer. As a thermally conductive layer, the second film layer 202 can significantly improve the heat dissipation performance of the battery. During the charging and discharging process of the battery, a certain amount of heat is generated inside. If the heat cannot be dissipated in time, the battery temperature will rise, thereby affecting the battery's performance and lifespan. The presence of the thermally conductive layer can quickly transfer this heat to the outside of the battery, where it can be dissipated through heat sinks, fans, and other heat dissipation devices, thereby keeping the battery's operating temperature within a reasonable range and improving the battery's performance and lifespan.

[0037] Furthermore, in some embodiments of this invention, an elastic coating (not shown in the drawings) is brushed onto the side of the second film layer 202 facing away from the first film layer 201. The elastic properties of the elastic coating ensure a tight fit between the core body 1 and the outer casing after it is installed. This reduces air gaps and heat accumulation inside the battery, thereby improving the battery's heat dissipation performance and energy density.

[0038] Please refer to Figure 4 An adhesive coating 3011 is provided on the side of the extension portion 301 facing the second film layer 202. The adhesive coating 3011 is used to connect the extension portion 301 and the second film layer 202. Under prolonged use or vibration, without the adhesive coating 3011, even slight displacement or loosening between the extension portion 301 and the second film layer 202 could affect the battery's performance and safety. The adhesive coating 3011 tightly connects the extension portion 301 and the second film layer 202, enhancing the structural strength at both ends of the core body 1 and preventing separation under external impact, thereby improving the overall impact resistance. Compared to mechanical connections or welding, the use of the adhesive coating 3011 is generally less expensive. This not only helps reduce battery manufacturing costs but also improves production efficiency.

[0039] Furthermore, in some embodiments of this utility model, the insulating pad 3 is provided with a groove 302, which is used for the tabs on the core body 1 to extend out. The tabs on the core body 1 pass through the groove 302 and extend out of the insulating pad 3. When the tabs are bent, the insulating pad 3 prevents the tabs from contacting the core body 1, thereby preventing the tabs from puncturing the core body 1.

[0040] Please refer to Figure 2 and Figure 4In some embodiments of this utility model, the groove 302 extends from the edge of the extension portion 301 toward the interior of the insulating pad 3. During assembly, the assembler aligns the tab with the opening of the groove 302 and slides it into the groove 302, thereby reducing assembly difficulty and error rate.

[0041] In addition, the insulating pad 3 is provided with several through holes 303. The through holes 303 allow the electrolyte to freely penetrate and distribute inside the battery, ensuring that the core body 1 can be fully immersed in the electrolyte, thereby improving the battery's charge and discharge efficiency and cycle life.

[0042] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A high safety cylindrical lithium battery core, characterized in that, The winding core body and a protective film sleeved on the outer periphery of the winding core body, the protective film comprises a first film layer and a second film layer which are stacked, one side of the first film layer away from the second film layer is bonded to the outer side wall of the winding core body, both ends of the winding core body are respectively provided with an insulating gasket, the edge of the insulating gasket extends outward to form an extension part, and the extension part abuts against the end part of the second film layer.

2. The high safety cylindrical lithium battery cell of claim 1, wherein, The height of the first film layer and the second film layer is matched with the height of the winding core body. 3.The high-safety cylindrical lithium battery roll core according to claim 1, characterized in that, The first film layer is an insulating layer. 4.The high-safety cylindrical lithium battery roll core according to claim 1, characterized in that, The second film layer is a heat-conducting layer. 5.The high-safety cylindrical lithium battery roll core according to claim 1, wherein, The side of the second film layer away from the first film layer is brushed with an elastic coating. 6.The high-safety cylindrical lithium battery roll core according to claim 1, wherein, The side of the extension part toward the second film layer is provided with a bonding coating for connecting the extension part and the second film layer. 7.The high-safety cylindrical lithium battery roll core according to claim 1, wherein, The insulating gasket is provided with a groove for the tab on the winding core body to extend out. 8.The high-safety cylindrical lithium battery roll core according to claim 7, characterized in that, The groove extends from the edge of the extension part toward the insulating gasket. 9.The high-safety cylindrical lithium battery roll core according to claim 1, wherein, The insulating gasket is provided with a plurality of through holes.

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