Battery and electric equipment

Abstract

The invention provides a battery and electric equipment, the battery comprises a shell, a top cover, a confluence piece and a sealing part, the top of the shell is provided with an opening, the top cover covers the opening, the confluence piece is arranged in the shell, the confluence piece and the top cover are arranged at an interval along the direction from the top to the bottom of the shell, and the confluence piece, the top cover and the shell jointly define a placement space; the sealing part is installed in the placement space and used for being connected with the confluence piece, the top cover and the shell in a sealed mode, the sealing part comprises a first sealing ring and a second sealing ring which are sequentially connected in the direction from the top to the bottom of the shell, and the hardness of the first sealing ring is larger than that of the second sealing ring. Therefore, the first sealing ring is relatively high in hardness, can provide stronger supporting force and deformation resistance, and is not easy to collapse under external pressure or impact, so that external impurities (such as moisture and dust) are effectively prevented from entering the battery. The second sealing ring is low in hardness and can better adapt to deformation, small gaps are filled, and the sealing effect is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to batteries and electrical equipment. Background Art

[0002] In related art, cylindrical batteries typically include a housing, a top cover, a current collector, a winding core, and a sealing ring. The current collector and winding core are both located within the housing, while the top cover covers the opening of the housing. A relatively weak sealing ring is sandwiched between the top cover and the housing to seal the gap between them. However, this sealing method is relatively ineffective. Summary of the Invention

[0003] Embodiments of the present invention provide a battery and an electrical device, aiming to improve the sealing performance of the battery.

[0004] In a first aspect, an embodiment of the present invention provides a battery.

[0005] In one embodiment, the battery comprises:

[0006] a housing, wherein the top of the housing is provided with an opening;

[0007] a top cover, covering the opening;

[0008] A current collector is disposed in the housing and spaced apart from the top cover along a direction from the top to the bottom of the housing, wherein the current collector, the top cover and the housing together enclose a placement space;

[0009] a sealing portion installed in the placement space and used for sealing connection with the manifold, the top cover and the housing, the sealing portion comprising a first sealing ring and a second sealing ring sequentially connected and arranged from the top to the bottom of the housing, the first sealing ring at least partially abutting against the top cover, and the second sealing ring abutting against the manifold on a side facing away from the first sealing ring;

[0010] Wherein, the hardness of the first sealing ring is greater than the hardness of the second sealing ring.

[0011] In one embodiment, the material of the first sealing ring includes a perfluoroalkoxy polymer; and / or,

[0012] The material of the second sealing ring includes fluororubber; and / or,

[0013] The first sealing ring and the second sealing ring are integrally provided.

[0014] In one embodiment, the housing includes a housing body and an annular boss protruding from an inner sidewall of the housing body, wherein the annular boss extends along the circumference of the housing body and surrounds the opening.

[0015] The periphery of the top cover is located on the side of the annular boss facing the bottom of the shell, and the periphery of the top cover is spaced apart from the annular boss;

[0016] The first sealing ring is at least partially sandwiched between the peripheral edge of the top cover and the annular boss.

[0017] In one embodiment, the first sealing ring includes a first sealing body and a first sealing ring connected to the first sealing body, the first sealing body is elastically connected between the top cover and the second sealing ring, and a portion of the first sealing ring is clamped between the annular boss and the top cover.

[0018] In one embodiment, the thickness of the first sealing body is H1, wherein 0.1 mm≤H1≤0.7 mm.

[0019] In one embodiment, the first sealing ring includes a connecting ring segment and a sealing ring segment, and both ends of the connecting ring segment are respectively connected to the first sealing body and the sealing ring segment, so that the connecting ring segment, the first sealing body and the sealing ring segment are jointly surrounded to form a card groove, the periphery of the top cover is clamped in the card groove, and the sealing ring segment is elastically abutted against the annular boss.

[0020] In one embodiment, the inner diameter of the sealing ring segment is smaller than the inner diameter of the annular boss.

[0021] In one embodiment, the difference between the inner diameter and the outer diameter of the connecting ring segment is ΔR, wherein ΔR>0.5 mm.

[0022] In one embodiment, the initial thickness of the sealing ring segment is H2, wherein 0.5 mm ≤ H2 ≤ 1.5 mm; and / or,

[0023] The thickness of the compressed sealing ring segment is H3, wherein 0.1 mm≤H3≤0.7 mm.

[0024] In one embodiment, the current collector includes a first collector ring having a first side and a second side disposed in a direction away from each other along a spacing direction between the top and the bottom of the housing, and the first side elastically abuts against the second sealing ring;

[0025] The outer side wall of the shell adjacent to the opening is provided with a rolling groove, and the rolling groove has a supporting side wall provided adjacent to the opening, and the supporting side wall is welded and fixed to the second side.

[0026] In one embodiment, the supporting side wall is provided with a welding area, and along the radial direction of the first collecting ring, the width of the welding area is K, wherein K>1 mm.

[0027] In one embodiment, a winding core is further included, and the winding core is disposed in the shell. The side of the winding core facing the opening abuts against the side wall of the rolling groove away from the opening.

[0028] In one embodiment, at least a portion of a side wall of the rolling groove away from the opening is configured as an avoidance slope, and the avoidance slope is used to avoid the tab of the winding core.

[0029] In one embodiment, the current collector also includes a second collecting ring and a connecting ring, the second collecting ring is opposite to the first collecting ring and is arranged at intervals, the connecting ring connects the first collecting ring and the second collecting ring, the second collecting ring is welded and fixed to the winding core, and the rolling groove is located between the second collecting ring and the first collecting ring.

[0030] In one embodiment, the outer diameter of the second collector ring is greater than the outer diameter of the connecting ring; and / or,

[0031] The inner diameter of the first slip ring is greater than the inner diameter of the second sealing ring.

[0032] In one embodiment, the outer diameter of the second slip ring is D1, and the diameter of the winding core is D2, wherein 50%≤D1 / D2≤95%.

[0033] In one embodiment, along the radial direction of the connecting ring, the distance between the outer side wall of the connecting ring and the bottom wall of the rolling groove is L1, wherein L1>0.3mm; and / or,

[0034] Along the radial direction of the winding core, a distance between the outer side wall of the second collecting ring and the bottom wall of the rolling groove is L2, wherein L2>0.2 mm.

[0035] In one embodiment, the top cover is provided with an annular thinned area.

[0036] In one embodiment, the inner diameters of the first sealing ring and the second sealing ring are both larger than the inner diameter of the annular thinned area.

[0037] In a second aspect, the present application further provides an electrical device, which includes the battery as described above.

[0038] Beneficial effects of the embodiments of the present invention:

[0039] In an embodiment of the present invention, the first sealing ring at least partially abuts the top cover. Due to the high hardness of the first sealing ring, the first sealing ring can provide stronger support and deformation resistance, and is not easy to collapse under external pressure or impact, thereby effectively preventing external impurities (such as moisture, dust, etc.) from entering the battery. The side of the second sealing ring facing away from the first sealing ring abuts the manifold. Due to the lower hardness of the second sealing ring, the second sealing ring can better adapt to deformation, fill small gaps, and further improve the sealing effect. The use of a first sealing ring and a second sealing ring with different hardnesses can disperse stress and strain to a certain extent and extend the service life of the entire sealing part. The first sealing ring has a higher hardness and can maintain shape stability during long-term use, avoiding seal failure due to creep or permanent compression set. The second sealing ring is softer and has better elasticity and recovery ability, and can maintain good sealing performance after multiple assembly or disassembly. The high hardness of the first sealing ring makes it easier to fix its position during assembly, reducing the possibility of offset or misalignment, thereby improving assembly efficiency and accuracy. The second sealing ring is softer, allowing it to better conform to the interface during assembly, ensuring a tight seal connection while also reducing friction during assembly and minimizing damage to other components. In high and low temperature environments, the hard first sealing ring maintains its shape, preventing seal failure due to thermal expansion or contraction. The soft second sealing ring, on the other hand, can flexibly adapt to interface changes caused by temperature differences, ensuring a stable seal. The sealing portion, located within the housing space enclosed by the manifold, top cover, and housing, and composed of the first and second sealing rings, effectively blocks electrolyte leakage and the intrusion of external chemicals, enhancing the safety, reliability, and sealing of the battery. The seal formed by the first and second sealing rings effectively prevents electrolyte leakage within the battery, avoiding the risk of short circuits or fires caused by leakage. The high hardness of the first sealing ring absorbs some external impact forces, protecting internal components. The flexibility of the second sealing ring relieves stress concentration during impact, significantly improving the battery's sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a schematic cross-sectional view of a battery (at one angle) provided by an embodiment of the present invention;

[0042] Figure 2 yes Figure 1 A local enlarged schematic diagram shown;

[0043] Figure 3 is a schematic cross-sectional view of a battery (from another angle) provided by an embodiment of the present invention;

[0044] Figure 4 yes Figure 3 The local enlarged schematic diagram of point B is shown;

[0045] Figure 5 It is a structural schematic diagram of a current collector provided by an embodiment of the present invention.

[0046] Description of reference numerals:

[0047] 100. Battery; 1. Shell; 11. Opening; 12. Shell body; 13. Annular boss; 14. Rolling groove; 141. Support side wall; 15. Side wall segment; 2. Top cover; 21. Annular thinning area; 3. Current collector; 31. First collecting ring; 311. First side; 312. Second side; 32. Second collecting ring; 33. Connecting ring; 5. Sealing part; 51. First sealing ring; 511. First sealing body; 512. First sealing ring; 5121. Connecting ring segment; 5122. Sealing ring segment; 52. Second sealing ring; 6. Slot; 7. Winding core. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0049] In related art, cylindrical batteries typically include a housing, a top cover, a current collector, a winding core, and a sealing ring. The current collector and winding core are both located within the housing, while the top cover covers the opening of the housing. A relatively weak sealing ring is sandwiched between the top cover and the housing to seal the gap between them. However, this sealing method is relatively ineffective.

[0050] In view of this, the present invention proposes a battery, Figures 1 to 5 This is a schematic diagram of the structure of an embodiment of the battery provided by the present invention. The sealing performance of the battery provided by the present invention is greatly improved. The battery will be described in detail below with reference to the main figures.

[0051] Reference Figures 1 to 3 The battery 100 includes a shell 1, a top cover 2, a current collector 3 and a sealing portion 5. The top of the shell 1 is provided with an opening 11, and the top cover 2 is covered on the opening 11. The current collector 3 is provided in the shell 1 and is spaced apart from the top cover 2 along the top to bottom direction of the shell 1. The current collector 3, the top cover 2 and the shell 1 are jointly enclosed to form an installation space. The sealing portion 5 is installed in the installation space to be sealed and connected with the current collector 3, the top cover 2 and the shell 1. The sealing portion 5 includes a first sealing ring 51 and a second sealing ring 52 which are sequentially connected and arranged along the top to bottom direction of the shell 1. The first sealing ring 51 at least partially abuts against the top cover 2, and the second sealing ring 52 abuts against the current collector 3 on the side facing away from the first sealing ring 51. The hardness of the first sealing ring 51 is greater than that of the second sealing ring 52.

[0052] In an embodiment of the present invention, the first sealing ring 51 at least partially abuts the top cover 2. Due to the higher hardness of the first sealing ring 51, it provides stronger support and deformation resistance, making it less likely to collapse under external pressure or impact, thereby effectively preventing external impurities (such as moisture and dust) from entering the battery 100. The second sealing ring 52, on the side facing away from the first sealing ring 51, abuts the manifold 3. Due to its lower hardness, the second sealing ring 52 can better adapt to deformation, fill small gaps, and further enhance the sealing effect. The use of first and second sealing rings 51, 52 with different hardnesses works together to disperse stress and strain to a certain extent, extending the service life of the entire sealing portion 5. The higher hardness of the first sealing ring 51 ensures its shape stability during long-term use, preventing seal failure due to creep or compression set. The softer second sealing ring 52 has greater elasticity and resilience, allowing it to maintain good sealing performance even after multiple assembly and disassembly. The high hardness of the first sealing ring 51 makes it easier to fix its position during assembly, reducing the possibility of drift or misalignment, thereby improving assembly efficiency and accuracy. The second sealing ring 52 is softer, allowing it to better conform to the interface during assembly, ensuring a tight seal connection while also reducing friction and minimizing damage to other components. In high and low temperature environments, the rigid first sealing ring 51 maintains its shape, preventing seal failure due to thermal expansion or contraction. The soft second sealing ring 52 flexibly adapts to interface changes caused by temperature differences, ensuring a stable seal. The sealing portion 5, located within the housing space enclosed by the manifold 3, top cover 2, and housing 1, and composed of the first and second sealing rings 51 and 52, effectively prevents electrolyte leakage and the intrusion of external chemicals, enhancing the safety, reliability, and sealing performance of the battery 100. The sealing portion 5, formed by the first and second sealing rings 51 and 52, effectively prevents electrolyte leakage within the battery 100, minimizing the risk of short circuits or fires caused by leakage. The high hardness of the first sealing ring 51 absorbs some external impact forces, protecting internal components. The flexibility of the second sealing ring 52 alleviates stress concentration during impact, significantly improving the sealing performance of the battery 100.

[0053] In one embodiment, the first sealing ring 51 is made of perfluoroalkoxy polymer (PFA). PFA maintains excellent physical and mechanical properties over a wide temperature range, from as low as -200°C to as high as approximately +260°C. This allows it to operate under extreme temperature conditions, ensuring the seal 5 maintains an effective seal, whether in cold outdoor environments or high-temperature operating environments. PFA's low coefficient of friction helps reduce frictional losses between the seal 5 and other components, extending the service life of the seal 5 and its contacting components.

[0054] It should be noted that the material of the first sealing ring 51 can also be selected as needed. For example, in other embodiments, the material of the first sealing ring 51 can include at least one of polyurethane, polytetrafluoroethylene, and polyetheretherketone. Specifically, this application does not limit this.

[0055] In one embodiment, the second sealing ring 52 is made of fluororubber. Fluororubber maintains its physical and mechanical properties over a wide operating temperature range, typically between -20°C and +250°C, and can even withstand temperatures up to 300°C for short periods. This means it can operate effectively in high-temperature environments, providing reliable sealing protection. Fluororubber not only has good tensile strength but also exhibits excellent wear resistance. Compared to other types of rubber, fluororubber has a lower gas permeability, which is particularly important for preventing gas leakage and helping to improve the reliability of the entire sealing system.

[0056] It should be noted that the material of the second sealing ring 52 can be selected as needed. For example, in other embodiments, the material of the second sealing ring 52 can also include at least one of silicone rubber, ethylene propylene rubber, polyurethane rubber, polyurethane rubber, and nitrile rubber. Specifically, this application does not limit this.

[0057] In one embodiment, the first and second sealing rings 51, 52 are integrally formed. This integrated design avoids potential misalignment or gapping between the first and second sealing rings 51, 52 during assembly, thereby improving the integrity and precision of the sealing portion 5. The integrated design of the first and second sealing rings 51, 52 can better resist deformation caused by external pressure or vibration, reducing the risk of leakage due to failure of the sealing portion 5. This integrated design eliminates the need for separate assembly of the first and second sealing rings 51, 52, simplifying the assembly process and reducing operational complexity and time costs. Because the first and second sealing rings 51, 52 are already fixed together during the manufacturing process, their hardness difference and interlayer fit are precisely designed, enabling better synergy between the two layers of sealing and enhancing the overall sealing effect. While separate first and second sealing rings 51, 52 may present a risk of minor gaps or interface leakage, the integrated design eliminates this risk, further improving sealing reliability. The integrated design ensures more uniform stress distribution between the first and second sealing rings 51, 52, reducing fatigue damage caused by stress concentration during long-term use.

[0058] There are many ways to integrate the first sealing ring 51 and the second sealing ring 52. For example, in some embodiments, a material with a relatively high hardness can be first injection-molded to form the first sealing ring 51. Then, the first sealing ring 51 and a material with a relatively low hardness can be integrally injection-molded to form a second sealing ring integrally connected to the first sealing ring, thereby achieving the integrated arrangement of the first sealing ring 51 and the second sealing ring 52. In another embodiment, the first sealing ring 51 with a relatively high hardness and the second sealing ring with a relatively low hardness can be glued together and then installed. Specifically, this application does not limit the specific method for integrating the first sealing ring 51 and the second sealing ring 52.

[0059] It should be noted that, in order to improve the sealing performance of the battery 100 , in other embodiments, glue may be applied at the contact position between the opening 11 and the sealing portion 5 to ensure sealing.

[0060] In one embodiment, the housing 1 includes a housing body 12 and an annular boss 13 protruding from the inner side wall of the housing body 12. The annular boss 13 extends along the circumference of the housing body 12. The annular boss 13 surrounds the opening 11. The periphery of the top cover 2 is located on the side of the annular boss 13 facing the bottom of the housing 1, and the periphery of the top cover 2 is spaced apart from the annular boss 13. By making the first sealing ring 51 at least partially sandwiched between the periphery of the top cover 2 and the annular boss 13, an effective sealing barrier is formed. Even under extreme conditions (such as high temperature, high pressure or mechanical shock), it can effectively prevent foreign substances (such as moisture, dust, etc.) from entering the interior of the battery 100. The design of the annular boss 13 enables the first sealing ring 51 to be evenly stressed during compression, avoiding the problem of sealing failure caused by local stress concentration. The annular boss 13 not only provides a positioning reference for the sealing ring, but also enhances the overall rigidity of the housing 1, helps to resist external pressure and impact, and protects the safety of internal components. The opening 11 formed by the annular boss 13 fits more closely with the top cover 2, ensuring accurate positioning of the top cover 2 during installation and reducing the risk of leakage due to improper assembly.

[0061] In one embodiment, the first sealing ring 51 comprises a first sealing body 511 and a first sealing ring 512 connected to the first sealing body 511. The first sealing body 511 is elastically connected between the top cover 2 and the second sealing ring 52, while the first sealing ring 512 is partially sandwiched between the annular boss 13 and the top cover 2. In this way, the first sealing body 511 primarily provides overall elastic support and fills the small gap between the top cover 2 and the second sealing ring 52; while the first sealing ring 512 is specifically designed to fill the larger gap between the annular boss 13 and the top cover 2, ensuring a tighter seal. Due to its elastic properties, the first sealing body 511 can be evenly distributed between the top cover 2 and the second sealing ring 52 during compression, preventing localized stress concentration that could cause seal failure. The sandwiching of the first sealing ring 512 between the annular boss 13 and the top cover 2 further enhances the tightness of the seal. As an intermediate layer, the first sealing body 511 not only provides the necessary elastic support but also cushions external impact forces to a certain extent, protecting internal components from damage. Furthermore, the presence of the first sealing ring 512 increases the rigidity of the entire sealing system, helping to resist external pressure. The first sealing ring 512 is sandwiched between the annular boss 13 and the top cover 2, ensuring precise positioning of the top cover 2 during installation and reducing the risk of leakage due to improper assembly. The elastic connection characteristics of the first sealing body 511 also facilitate quick position adjustment, ensuring a secure seal. The dual protection provided by the first sealing ring 512 and the first sealing body 511 effectively prevents leakage of electrolyte or other internal liquids, reducing potential safety hazards.

[0062] In one embodiment, the thickness of the first sealing body 511 is H1, wherein 0.1mm≤H1≤0.7mm. In this way, the thickness H1 of the first sealing body 511 determines its elastic deformation ability when compressed. Within the range of 0.1mm≤H1≤0.7mm, the sealing body can provide sufficient elastic support between the top cover 2 and the second sealing ring 52, while avoiding excessive compression due to excessive thickness or insufficient sealing due to excessive thinness. The thickness of the first sealing body 511 is between 0.1mm and 0.7mm, and the sealing body can achieve a relatively uniform pressure distribution, thereby ensuring a close fit of the entire sealing interface and reducing the existence of small gaps.

[0063] If H1 is greater than 0.7mm, excessive pressure may be required to achieve the required compression during assembly, increasing assembly difficulty. If H1 is less than 0.1mm, sufficient elastic deformation may not be achieved, resulting in a reduced sealing effect. Therefore, a thickness of the first sealing body 511 between 0.1mm and 0.7mm achieves a good balance between assembly ease and sealing performance. Within the 0.1mm to 0.7mm thickness range, the first sealing body 511 maintains good elasticity and resilience, neither being difficult to compress due to excessive thickness nor losing elasticity due to excessive thinness. A thickness range of 0.1mm to 0.7mm allows the first sealing body 511 to withstand repeated compression and recovery during long-term use without causing permanent deformation or fatigue failure, thereby extending its service life. The thickness H1 of the first sealing body 511 determines its support between the top cover 2 and the second sealing ring 52. Within the 0.1mm to 0.7mm thickness range, the first sealing body 511 provides sufficient support to prevent loosening of the seal due to external vibration or impact.

[0064] It should be noted that the thickness of the first sealing body 511 can be selected as needed. For example, the thickness of the first sealing body 511 can be 0.1 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.38 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.68 mm, or 0.7 mm, etc. Specifically, this application does not limit this.

[0065] In one embodiment, the first sealing ring 512 includes a connecting ring segment 5121 and a sealing ring segment 5122, and the two ends of the connecting ring segment 5121 are respectively connected to the first sealing body 511 and the sealing ring segment 5122, so that the connecting ring segment 5121, the first sealing body 511 and the sealing ring segment 5122 are collectively surrounded to form a slot 6, the periphery of the top cover 2 is clamped in the slot 6, and the sealing ring segment 5122 elastically abuts against the annular boss 13. In this way, the elastic abutment between the sealing ring segment 5122 and the annular boss 13 can effectively prevent foreign matter (such as moisture, dust, etc.) from entering the interior of the battery 100, while also preventing the electrolyte or other internal liquids from leaking out. The slot 6 provides a clear positioning reference for the periphery of the top cover 2, allowing the top cover 2 to be accurately aligned during installation, reducing the risk of leakage caused by improper assembly. The periphery of the top cover 2 can be directly clamped in the slot 6, simplifying the assembly steps, reducing operational complexity and time cost. The elastic contact between the sealing ring segment 5122 and the annular boss 13 ensures uniform pressure distribution during compression, avoiding seal failure caused by localized stress concentration. The elastic properties of the sealing ring segment 5122 can absorb external impact energy to a certain extent, protecting internal components from damage. The elastic contact between the sealing ring segment 5122 and the annular boss 13 maintains stable sealing performance under extreme temperature conditions (high or low), reducing the risk of seal failure due to temperature fluctuations.

[0066] Reference Figure 2 In one embodiment, the inner diameter of the sealing ring segment 5122 is smaller than the inner diameter of the annular boss 13. This means that during assembly, the sealing ring segment 5122 will be forced to expand outward to adapt to the shape of the annular boss 13. This design will generate greater contact pressure between the sealing ring segment 5122 and the annular boss 13, thereby enhancing the sealing effect and effectively preventing foreign substances (such as moisture, dust, etc.) from entering the interior of the battery 100. The inner diameter of the sealing ring segment 5122 is smaller than the inner diameter of the annular boss 13, so that the top cover 2 and the annular boss 13 are always separated by the sealing ring segment 5122, avoiding wear caused by contact between the top cover 2 and the annular boss 13, and achieving electrical isolation, thereby improving safety.

[0067] Reference Figure 2In one embodiment, the difference between the inner diameter and the outer diameter of the connecting ring segment 5121 is ΔR, where ΔR>0.5mm. In this way, the rigidity and deformation resistance of the connecting ring segment 5121 are enhanced, which enables the connecting ring segment 5121 to maintain a stable shape when subjected to external pressure or vibration. When the difference between the inner diameter and the outer diameter of the connecting ring segment 5121 is greater than 0.5mm, the connecting ring segment 5121 can better resist compression and tensile stresses during the assembly process or long-term use, thereby reducing the risk of sealing failure due to deformation. When the difference between the inner diameter and the outer diameter of the connecting ring segment 5121 is greater than 0.5mm, a more stable transition area can be formed between the top cover 2, the first sealing body 511 and the sealing ring segment 5122, ensuring the overall tightness of the sealing system and reducing the problem of loosening of the sealing interface caused by deformation of the connecting ring segment 5121. When the difference between the inner and outer diameters of the connecting ring segment 5121 is greater than 0.5 mm, pressure from the top cover 2 and the sealing ring segment 5122 can be more evenly transmitted, avoiding local stress concentration and thus improving sealing performance. When the difference between the inner and outer diameters of the connecting ring segment 5121 is greater than 0.5 mm, the sealing portion 5 is less likely to buckle or become damaged during assembly, ensuring a smooth assembly process and reducing seal failures due to improper assembly. When the difference between the inner and outer diameters of the connecting ring segment 5121 is greater than 0.5 mm, it exhibits improved fatigue resistance, being able to withstand repeated compression and recovery during long-term use without cracking or permanent deformation, thereby extending the service life of the sealing portion 5.

[0068] It should be noted that the difference between the inner diameter and the outer diameter of the connecting ring segment 5121 can be selected as needed. For example, the difference between the inner diameter and the outer diameter of the connecting ring segment 5121 can be 0.51 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.78 mm, or 0.8 mm, etc. Specifically, this application does not impose any limitation on this.

[0069] Furthermore, when the difference between the inner and outer diameters of the connecting ring segment 5121 is less than 0.5 mm, its rigidity and resistance to deformation are significantly reduced. During assembly or long-term use, the connecting ring segment 5121 may buckle, collapse, or permanently deform due to external pressure, tension, or vibration, thereby affecting the overall stability of the sealing portion 5. A difference between the inner and outer diameters of the connecting ring segment 5121 of less than 0.5 mm may result in insufficient elastic support, making it difficult to achieve uniform pressure distribution. This can lead to insufficient contact pressure at the sealing interface and increase the risk of leakage.

[0070] Reference Figure 2In one embodiment, the initial thickness of the sealing ring segment 5122 is H2, where 0.5 mm ≤ H2 ≤ 1.5 mm. Thus, within the range of 0.5 mm ≤ H2 ≤ 1.5 mm, the sealing ring segment 5122 can provide sufficient elastic deformation between the top cover 2 and the annular boss 13, while avoiding excessive compression due to excessive thickness or insufficient sealing due to excessive thinness. Within this thickness range, the sealing ring segment 5122 achieves relatively uniform pressure distribution, ensuring a tight fit across the entire sealing interface and minimizing the presence of micro-gaps. Within this thickness range, the sealing ring segment 5122 has sufficient elastic support to effectively prevent foreign matter (such as moisture and dust) from entering the battery 100 while also preventing leakage of electrolyte or other internal liquids. Within this thickness range, the sealing ring segment 5122 can withstand repeated compression and recovery during long-term use without suffering permanent deformation or fatigue failure, thereby extending its service life. The thickness H2 of the sealing ring segment 5122 determines its supporting role between the top cover 2 and the annular boss 13. Within this range, sealing ring segment 5122 provides sufficient support to prevent seal loosening due to external vibration or impact. Within a thickness range of 0.5 mm to 1.5 mm, sealing ring segment 5122 can adapt to significant temperature fluctuations. Even in extreme temperature conditions (high or low), sealing ring segment 5122 maintains good elasticity and sealing performance.

[0071] Furthermore, if H2 is greater than 1.5mm, excessive pressure may be required to achieve the required compression during assembly, increasing assembly difficulty. If H2 is less than 0.5mm, sufficient elastic deformation may not be achieved, resulting in a reduced sealing effect. Within the thickness range of 0.5mm to 1.5mm, the material maintains good elasticity and resilience, neither being difficult to compress due to excessive thickness nor losing elasticity due to excessive thinness. If H2 is greater than 1.5mm, insufficient compression may lead to an unstable seal. If H2 is less than 0.5mm, excessive compression may cause material failure.

[0072] It should be noted that the initial thickness of the sealing ring segment 5122 can be selected as needed. For example, the initial thickness of the sealing ring segment 5122 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, or 1.5 mm, etc. Specifically, this application does not impose any limitation on this.

[0073] The compressed thickness of the sealing ring segment 5122 is H3, where 0.1mm≤H3≤0.7mm. Thus, the compressed thickness H3 of the sealing ring segment 5122 is controlled within the range of 0.1mm to 0.7mm, ensuring that it provides sufficient elastic deformation capacity to achieve a tight fit while avoiding problems such as material failure due to excessive compression or insufficient sealing due to excessive thinness. Within this thickness range, the sealing ring segment 5122 can create a uniform pressure distribution between the top cover 2 and the annular boss 13, reducing local stress concentration, thereby improving the sealing effect and effectively preventing foreign matter (such as moisture, dust, etc.) from entering the interior of the battery 100. The compressed thickness within this range ensures that the sealing ring segment 5122 fully fills the contact surface, especially under dynamic operating conditions (such as vibration or temperature changes), and can still maintain stable sealing performance. Within the compressed thickness range of 0.1mm to 0.7mm, the sealing ring segment 5122 can withstand repeated compression and recovery during long-term use without prone to permanent deformation or fatigue failure, thereby extending the service life of the sealing portion 5. When the compressed thickness H3 is within the range of 0.1 mm to 0.7 mm, the sealing ring segment 5122 can adapt to large temperature changes. Even under extreme temperature conditions (high or low temperature), its elastic properties can remain stable, ensuring a good sealing effect.

[0074] Furthermore, if the compressed thickness of the sealing ring segment 5122 is less than 0.1 mm, the sealing ring segment 5122 is over-compressed, leading to material failure, reduced sealing performance, insufficient structural strength, complicated assembly processes, and poor durability. These problems can significantly reduce the reliability and service life of the sealing portion 5. If the compressed thickness of the sealing ring segment 5122 is greater than 0.7 mm, the sealing ring segment 5122 is insufficiently compressed, leading to insufficient sealing performance, insufficient support force, increased assembly difficulty, poor long-term stability, and increased maintenance costs. These problems also affect the overall performance and reliability of the sealing portion 5.

[0075] It should be noted that the thickness of the sealing ring segment 5122 after compression can be selected as needed. For example, the initial thickness of the sealing ring segment 5122 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.64 mm, or 0.7 mm, etc. Specifically, this application does not impose any limitation on this.

[0076] Reference Figure 2 、 Figure 4 and Figure 5In one embodiment, the collector 3 includes a first collector ring 31. The first collector ring 31 has a first side 311 and a second side 312 that are arranged in opposite directions along the spacing direction between the top and bottom of the shell 1. The first side 311 elastically abuts against the second sealing ring 52. The outer wall of the shell 1 adjacent to the opening 11 is provided with a rolling groove 14. The rolling groove 14 has a supporting side wall 141 arranged adjacent to the opening 11. The supporting side wall 141 is welded and fixed to the second side 312. In this way, the elastic abutment between the first collector ring 31 and the second sealing ring 52 can achieve uniform pressure distribution during compression, avoiding the problem of sealing failure caused by local stress concentration. The second side 312 of the first collector ring 31 is welded and fixed to the supporting side wall 141 of the rolling groove 14 on the shell 1, which not only enhances the rigidity of the entire battery 100 structure, but also provides stable support for the first collector ring 31, helps to resist external pressure and impact, and protects the safety of internal components. The welding fixation between the first collecting ring 31 and the supporting side wall 141 of the rolling groove 14 ensures accurate positioning during installation and reduces the risk of leakage caused by improper assembly.

[0077] In order to improve the sealing performance of the battery 100 , glue may be applied to the groove of the rolling groove 14 to enhance the sealing performance. Specifically, this application does not limit this.

[0078] Reference Figure 4 In one embodiment, the supporting side wall 141 is provided with a welding area, and the width of the welding area is K along the radial direction of the first collector ring 31, where K>1mm. In this way, a larger welding contact area is provided, thereby increasing the bonding strength of the weld between the first collector ring 31 and the supporting side wall 141. This helps to ensure that the connection between the first collector ring 31 and the supporting side wall 141 of the shell 1 is more secure, reducing the risk of loosening or breakage due to external stress (such as vibration or impact). A wider welding area can withstand greater shear forces and can provide better fatigue resistance, thereby increasing the service life of the battery 100. A welding area width greater than 1mm not only enhances the strength of the weld itself, but also provides stronger support for the first collector ring 31, helping to resist external pressure and impact and protect the safety of internal components. A wider welding area can evenly distribute stress in the welding area, avoid local stress concentration, and thus reduce the risk of crack expansion or material failure due to stress concentration.

[0079] In addition, when the width of the welding zone is less than or equal to 1 mm, it means that the area of ​​the welding area is very small, resulting in a significant reduction in the bonding strength of the welding point between the support side wall 141 and the first collector ring 31. This design can easily lead to a weak welding connection. When subjected to external stress (such as vibration, impact or thermal expansion), the welding point may loosen or even break. When the width of the welding zone is less than or equal to 1 mm, the welding zone will not be able to provide sufficient shear resistance, especially under dynamic working conditions (such as vibration during vehicle driving). The welding point between the support side wall 141 and the first collector ring 31 may fail due to repeated stress.

[0080] It should be noted that the width of the welding area can be selected as needed. For example, the width of the welding area can be 1.1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or 4 mm, etc. Specifically, this application does not limit this.

[0081] In one embodiment, the housing 1 has a side wall section 15 arranged opposite to the side of the sealing portion 5, and the connection between the side wall section 15 and the supporting side wall 141 is arranged in an arc transition, and the radius of the arc is greater than 0.2 mm. In this way, the arc transition design can effectively reduce the friction and interference between the sealing portion 5 and the inner wall of the housing 1 during the installation process. The arc radius greater than 0.2 mm makes it easier for the sealing portion 5 to slide into place, avoiding the jamming phenomenon caused by sharp angles or small radii. The arc transition can effectively disperse stress, especially in areas where stress concentration is prone to occur at the connection. Compared with sharp corners, the arc transition can make the stress distribution more uniform, reduce local stress concentration, and thus enhance the overall strength and durability of the sealing structure.

[0082] In one embodiment, the battery 100 further includes a winding core 7, which is disposed within the housing 1. The side of the winding core 7 facing the opening 11 abuts against the side wall of the rolling groove 14 facing away from the opening 11. This effectively prevents the winding core 7 from shifting or shaking within the battery 100, ensuring that the winding core 7 remains stable even when subjected to external vibration or impact, thereby protecting the electrodes and diaphragm from mechanical damage. The abutment between the winding core 7 and the side wall of the rolling groove 14 provides a clear reference point for positioning the winding core 7 during assembly, reducing the need for additional positioning devices, simplifying the assembly process, and improving production efficiency. The contact between the winding core 7 and the side wall of the rolling groove 14 increases the heat conduction path, helping to more quickly transfer heat generated by the winding core 7 to the housing 1 and dissipate it through the surface of the housing 1, thereby effectively preventing the winding core 7 from overheating. Because heat can be more evenly distributed across the contact surface, the temperature gradient within the winding core 7 is reduced, which helps to extend the service life of the battery 100 and improve its performance consistency.

[0083] Reference Figure 1 and Figure 3A gap can also be set between the side of the core 7 facing the opening 11 and the side wall of the groove 14 away from the opening 11 to avoid physical interference or friction between the two during assembly, thereby reducing assembly difficulty and improving assembly efficiency. Setting this gap provides more operating space for the core 7, facilitating precise alignment and installation, and reducing the risk of damage due to improper assembly. The gap between the core 7 and the side wall of the groove 14 can act as a buffer to a certain extent, allowing the core 7 to have a certain amount of deformation space when subjected to external pressure or internal expansion, thereby reducing material fatigue or failure caused by excessive extrusion.

[0084] In one embodiment, at least a portion of the sidewalls of the groove 14 facing away from the opening 11 are configured as ramps to clear the tabs of the winding core 7. Since the tabs of the winding core 7 typically extend from the main body of the winding core 7 and connect to the busbar 3 or other electrical components, if the groove 14 sidewalls were not provided with ramps, the tabs could physically interfere with or be squeezed against the sidewalls, hindering assembly. The provision of ramps effectively avoids this spatial conflict, ensuring smooth and unobstructed placement of the tabs. The ramps enable a more compact layout of the internal components of the battery 100 within a limited space, potentially increasing the energy density of the battery 100 or reducing its overall size, contributing to a more compact and lightweight design. The ramps provide a clear path for the tabs to clear, reducing the need to adjust the tab position during assembly, simplifying the assembly process, and improving efficiency. The ramps eliminate the need for the operator to carefully position the tabs during installation of the winding core 7, simplifying assembly and minimizing the risk of damage due to improper handling. The avoidance bevel can prevent the tab from being squeezed or rubbed during assembly, thus protecting its structural integrity. This is crucial for maintaining good electrical contact and reducing contact resistance.

[0085] The design of the relief bevel helps ensure stable contact between the tab and other electrical components (such as the busbar 3), avoiding poor electrical connection caused by tab deformation or positional displacement, and improving the reliability and consistency of the electrical connection. If the tab directly contacts the sidewall of the rolling groove 14, especially under high voltage conditions, there may be a risk of short circuit. The design of the relief bevel effectively prevents this from occurring, thereby improving the safety of the battery 100.

[0086] Reference Figure 2 、 Figure 4 and Figure 5In one embodiment, the current collector 3 also includes a second collector ring 32 and a connecting ring 33. The second collector ring 32 is spaced apart from and opposite the first collector ring 31. The connecting ring 33 connects the first collector ring 31 and the second collector ring 32. The second collector ring 32 is welded to the winding core 7, and the groove 14 is located between the second collector ring 32 and the first collector ring 31. In this way, the first collector ring 31 is welded to the supporting sidewall 141 of the groove 14, and the second collector ring 32 is welded to the winding core 7. This design ensures a secure installation of the current collector 3, ensures even current distribution within the battery 100, and reduces the risk of local overload. The second collector ring 32 is directly welded to the winding core 7, providing a more direct and stable electrical path, avoiding voltage drop or resistance increase caused by poor contact, and improving the overall electrical performance of the battery 100. The dual collector ring design allows current to be conducted through multiple paths, helping to disperse heat and prevent single-point overheating. The connecting ring 33 not only serves as a physical connection, but also serves as an additional heat dissipation channel to help transfer the heat generated by the core 7 to the shell 1 more quickly and dissipate it through the surface of the shell 1, further enhancing the heat dissipation efficiency.

[0087] Reference Figure 2 In one embodiment, the outer diameter of the second collector ring 32 is larger than the outer diameter of the connecting ring 33. Thus, the outer diameter of the second collector ring 32 is larger than the outer diameter of the connecting ring 33, which means that the second collector ring 32 has a larger surface area and cross-sectional area. This design can reduce the resistance when current passes through, reduce energy loss, and improve the overall electrical performance of the battery 100. The larger outer diameter enables the second collector ring 32 to be better welded and fixed to the core 7, and provides a more uniform current distribution path, avoiding heating problems caused by local overload or current concentration. The larger outer diameter of the second collector ring 32 provides additional mechanical support, enhancing its stability within the housing 1, especially when subjected to external vibration or impact, and can effectively prevent the core 7 or other components from shifting. The larger outer diameter of the second collector ring 32 increases its contact area with the surrounding environment, helping to transfer the heat generated by the core 7 to the surface of the housing 1 more quickly, thereby improving heat dissipation efficiency and preventing local overheating.

[0088] Reference Figure 2 In one embodiment, the inner diameter of the first slip ring 31 is larger than that of the second sealing ring 52. This allows the second sealing ring 52 to isolate the first slip ring 31 from the top cover 2, ensuring no direct metal-to-metal contact between the two. This prevents the risk of electrical shorts caused by accidental contact. Furthermore, this prevents vibration-induced wear and tear between the first slip ring 31 and the top cover 2, which could create metal debris and lead to electrical shorts.

[0089] In one embodiment, the outer diameter of the second slip ring 32 is D1, and the diameter of the winding core 7 is D2, where 50% ≤ D1 / D2 ≤ 95%. Thus, the ratio of the outer diameter D1 of the second slip ring 32 to the diameter D2 of the winding core 7 is within the range of 50% to 95%. This ensures that the second slip ring 32 is neither too large to occupy excessive space nor too small to restrict the current path. This design helps achieve higher energy density within a limited space. Within this ratio range, the second slip ring 32 can better fit with the winding core 7, avoiding space waste or assembly difficulties caused by size mismatch, thereby improving space utilization within the battery 100. When the ratio of the outer diameter D1 of the second slip ring 32 to the diameter D2 of the winding core 7 is within the range of 50% to 95%, the second slip ring 32 provides a larger conductive area, reducing resistance during current flow, minimizing energy loss, and improving the overall electrical performance of the battery 100. Within this ratio range, the second slip ring 32 can form a more uniform contact and current distribution path with the winding core 7, avoiding heating problems caused by local overload or current concentration. Within this ratio range, the second collector ring 32 can disperse heat more evenly, reduce the formation of heat concentration points, further improve the thermal management performance of the battery 100, and extend the service life of the battery 100. The ratio of the outer diameter D1 of the second collector ring 32 to the diameter D2 of the core 7 is within this range, which can provide sufficient mechanical support for the core 7 and prevent the core 7 from displacement or shaking when subjected to external vibration or impact, thereby protecting the electrodes and diaphragm from mechanical damage. The ratio of the outer diameter D1 of the second collector ring 32 to the diameter D2 of the core 7 is within the range of 50% to 95%, which enables the second collector ring 32 to evenly distribute the stress caused by external pressure or internal expansion, reduce local stress concentration, and reduce the risk of material fatigue or failure due to long-term use.

[0090] Furthermore, when D1 / D2 is less than 50%, the conductive area of ​​the second slip ring 32 is insufficient, thermal management performance is limited, structural stability is reduced, and assembly becomes more difficult. When D1 / D2 is greater than 95%, problems such as improper space utilization of the second slip ring 32, redundant current paths, obstructed heat dissipation paths, and increased risk of deformation may arise.

[0091] It should be noted that the value of D1 / D2 can be selected as needed. For example, the value of D1 / D2 can be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 95%, etc. Specifically, this application does not limit this.

[0092] Reference Figure 4In one embodiment, along the radial direction of the connecting ring 33, the distance between the outer sidewall of the connecting ring 33 and the bottom wall of the rolling groove 14 is L1, where L1 > 0.3 mm. Setting L1 > 0.3 mm ensures that the connecting ring 33 does not physically interfere with or rub against the bottom wall of the rolling groove 14 during installation, avoiding assembly difficulties or the risk of damage caused by contact. This makes the assembly process smoother and reduces the need for adjustment and calibration. Setting L1 > 0.3 mm creates a larger operating space between the outer sidewall of the connecting ring 33 and the bottom wall of the rolling groove 14, facilitating precise alignment and installation, reducing assembly difficulty and improving production efficiency. Maintaining a certain distance between the connecting ring 33 and the bottom wall of the rolling groove 14 avoids localized stress concentration caused by direct contact, thereby extending the service life of the battery 100. L1 > 0.3 mm can act as a buffer to a certain extent, allowing the connecting ring 33 to have sufficient room to deform when subjected to external pressure or internal expansion, thereby reducing material fatigue or failure caused by excessive extrusion.

[0093] In addition, when L1 ≤ 0.3 mm, the gap between the connecting ring 33 and the bottom wall of the rolling groove 14 is very small, which may cause interference or friction during the assembly process. This will significantly increase the difficulty of assembly, prolong the assembly time, and may require higher-precision equipment or more complex operating procedures. When L1 ≤ 0.3 mm, the connecting ring 33 or the rolling groove 14 may be squeezed or scratched during the assembly process, thereby affecting their performance or causing an increase in the scrap rate. A gap of less than or equal to 0.3 mm between the connecting ring 33 and the bottom wall of the rolling groove 14 will make it easier for the two to come into direct contact when subjected to force, thereby causing local stress concentration. This stress concentration may accelerate material fatigue and reduce the service life of the battery 100. During the use of the battery 100, the connecting ring 33 may undergo slight deformation due to changes in internal pressure (such as electrolyte expansion) or external environment (such as vibration, impact, etc.). If the gap is too small, this deformation may be restricted, causing component deformation or even failure.

[0094] It should be noted that the distance between the outer wall of the connecting ring 33 and the bottom wall of the rolling groove 14 can be 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm or 0.7 mm, etc. Specifically, this application does not limit this.

[0095] Reference Figure 4In one embodiment, along the radial direction of the winding core 7, the distance between the outer wall of the second collector ring 32 and the bottom wall of the rolling groove 14 is L2, where L2>0.2mm. In this way, setting L2>0.2mm can ensure that the second collector ring 32 will not physically interfere with or rub against the bottom wall of the rolling groove 14 during the installation process, avoiding assembly difficulties or damage risks caused by contact, which makes the assembly process smoother and reduces the need for adjustment and calibration. The distance between the outer wall of the second collector ring 32 and the bottom wall of the rolling groove 14 is greater than 0.2mm, which provides more operating space, facilitates the precise alignment and installation of the collector 3, reduces the difficulty of assembly, and improves production efficiency. The distance between the second collector ring 32 and the bottom wall of the rolling groove 14 is greater than 0.2mm, which can avoid local stress concentration caused by direct contact, especially under dynamic working conditions (such as vibration or impact). This design helps to disperse stress and extend the service life of the battery 100. The distance between the second collector ring 32 and the bottom wall of the rolling groove 14 being greater than 0.2 mm can play a buffering role to a certain extent, allowing the second collector ring 32 to have a certain deformation space when subjected to external pressure or internal expansion, thereby reducing material fatigue or failure caused by excessive extrusion.

[0096] In addition, when the distance between the second collector ring 32 and the bottom wall of the rolling groove 14 is less than 0.2 mm, physical interference or friction is likely to occur between the two during the assembly process, increasing the difficulty of assembly. Operators need higher precision to avoid contact between components, which may extend the assembly time and increase the complexity of the operation. When the distance between the second collector ring 32 and the bottom wall of the rolling groove 14 is less than 0.2 mm, it is easier to damage the second collector ring 32 or the bottom wall of the rolling groove 14 during the assembly process, especially if there are any slight dimensional deviations or assembly errors, which may cause scratches, deformation or other forms of damage to the components. When the distance between the second collector ring 32 and the bottom wall of the rolling groove 14 is less than 0.2 mm, it will cause the second collector ring 32 and the bottom wall of the rolling groove 14 to be more likely to directly contact when subjected to force, thereby causing local stress concentration. This stress concentration may accelerate material fatigue and reduce the service life of the battery 100.

[0097] It should be noted that the distance between the outer wall of the second collector ring 32 and the bottom wall of the rolling groove 14 can be set as needed. For example, the distance between the outer wall of the second collector ring 32 and the bottom wall of the rolling groove 14 can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, or 0.7 mm, etc. Specifically, this application does not impose any limitation on this.

[0098] Reference Figure 2 and Figure 4In one embodiment, the top cover 2 is provided with an annular thinned area 21. When thermal runaway occurs in the battery 100, the internal temperature rises sharply, causing the electrolyte to decompose and produce a large amount of gas, forming a high-pressure environment. The annular thinned area 21 serves as a preset weak point and can be preferentially ruptured when a certain pressure is reached, thereby safely releasing the internal pressure and avoiding the battery 100 shell 1 from bursting or exploding due to excessive pressure. The annular thinned area 21 can rupture quickly at the early stage of thermal runaway, release the internal pressure in time, prevent the further accumulation of high-temperature gases and substances, and thus delay or even prevent the spread of thermal runaway.

[0099] It should be noted that there are many ways to form the thinned area 21. For example, an annular groove can be formed on the top cover 2. Specifically, this application does not limit the cross-sectional shape of the annular groove. For example, the cross-sectional shape of the annular groove can be trapezoidal, square, or semicircular. Specifically, this application does not limit this.

[0100] Reference Figure 2 In one embodiment, the inner diameters of the first sealing ring 51 and the second sealing ring 52 are both larger than the inner diameter of the annular thinning area 21. In this way, the annular thinning area 21 is a key part designed to rupture and release internal pressure when thermal runaway occurs in the battery 100. If the inner diameters of the first sealing ring 51 and the second sealing ring 52 are smaller than the inner diameter of the annular thinning area 21, it may cause the sealing ring to partially cover the annular thinning area 21, hindering it from rupturing and releasing pressure in an emergency. Therefore, setting the inner diameters of the first sealing ring 51 and the second sealing ring 52 to be larger than the inner diameter of the annular thinning area 21 can ensure that the annular thinning area 21 can rupture smoothly and effectively release pressure in the event of thermal runaway, thereby avoiding the risk of bursting or explosion of the battery 100 shell 1.

[0101] Secondly, an embodiment of the present invention further proposes an electrical device, which includes the battery 100 as described above. The specific structure of the battery 100 refers to the above embodiment. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0102] It should be noted that the electrical equipment may be a vehicle, an energy storage power supply, consumer electronics, medical equipment, or a smart city, etc. Specifically, this application does not limit this.

[0103] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery, characterized in that: include: a housing, wherein the top of the housing is provided with an opening; a top cover, covering the opening; A current collector is disposed in the housing and spaced apart from the top cover along a direction from the top to the bottom of the housing, wherein the current collector, the top cover and the housing together enclose a placement space; a sealing portion installed in the placement space and used for sealing connection with the manifold, the top cover and the housing, the sealing portion comprising a first sealing ring and a second sealing ring sequentially connected and arranged from the top to the bottom of the housing, the first sealing ring at least partially abutting against the top cover, and the second sealing ring abutting against the manifold on a side facing away from the first sealing ring; Wherein, the hardness of the first sealing ring is greater than the hardness of the second sealing ring.

2. The battery according to claim 1, characterized in that The material of the first sealing ring includes perfluoroalkoxy polymer; and / or, The material of the second sealing ring includes fluororubber; and / or, The first sealing ring and the second sealing ring are integrally provided.

3. The battery according to claim 1, characterized in that The housing includes a housing body and an annular boss protruding from the inner side wall of the housing body, wherein the annular boss extends along the circumference of the housing body and surrounds the opening. The periphery of the top cover is located on the side of the annular boss facing the bottom of the shell, and the periphery of the top cover is spaced apart from the annular boss; The first sealing ring is at least partially sandwiched between the peripheral edge of the top cover and the annular boss.

4. The battery according to claim 3, characterized in that The first sealing ring includes a first sealing body and a first sealing ring connected to the first sealing body. The first sealing body is elastically connected between the top cover and the second sealing ring. Part of the first sealing ring is clamped between the annular boss and the top cover.

5. The battery according to claim 4, characterized in that The thickness of the first sealing body is H1, wherein 0.1 mm≤H1≤0.7 mm.

6. The battery according to claim 4, characterized in that The first sealing ring includes a connecting ring segment and a sealing ring segment. The two ends of the connecting ring segment are respectively connected to the first sealing body and the sealing ring segment, so that the connecting ring segment, the first sealing body and the sealing ring segment are jointly surrounded to form a slot. The periphery of the top cover is clamped in the slot, and the sealing ring segment is elastically abutted against the annular boss.

7. The battery according to claim 6, characterized in that The inner diameter of the sealing ring segment is smaller than the inner diameter of the annular boss.

8. The battery according to claim 6, characterized in that The difference between the inner diameter and the outer diameter of the connecting ring segment is ΔR, wherein ΔR>0.5 mm.

9. The battery according to claim 6, characterized in that The initial thickness of the sealing ring segment is H2, wherein 0.5 mm ≤ H2 ≤ 1.5 mm; and / or, The thickness of the compressed sealing ring segment is H3, wherein 0.1 mm≤H3≤0.7 mm.

10. The battery according to any one of claims 1 to 9, characterized in that The current collector comprises a first collector ring, the first collector ring having a first side and a second side disposed in a direction away from each other from the top and bottom of the housing, the first side elastically abutting against the second sealing ring; The outer side wall of the shell adjacent to the opening is provided with a rolling groove, and the rolling groove has a supporting side wall provided adjacent to the opening, and the supporting side wall is welded and fixed to the second side.

11. The battery according to claim 10, characterized in that The supporting side wall is provided with a welding area. Along the radial direction of the first collecting ring, the width of the welding area is K, wherein K>1 mm.

12. The battery according to claim 10, characterized in that It also includes a winding core, which is arranged in the shell, and the side of the winding core facing the opening is in contact with the side wall of the rolling groove away from the opening.

13. The battery according to claim 12, characterized in that At least a portion of a side wall of the rolling groove away from the opening is configured as an avoidance slope, and the avoidance slope is used to avoid the tab of the winding core.

14. The battery according to claim 12, characterized in that The current collector also includes a second collecting ring and a connecting ring. The second collecting ring is opposite to the first collecting ring and is arranged at intervals. The connecting ring connects the first collecting ring and the second collecting ring. The second collecting ring is welded and fixed to the winding core. The rolling groove is located between the second collecting ring and the first collecting ring.

15. The battery according to claim 14, characterized in that The outer diameter of the second collector ring is greater than the outer diameter of the connecting ring; and / or, The inner diameter of the first slip ring is greater than the inner diameter of the second sealing ring.

16. The battery according to claim 14, characterized in that The outer diameter of the second collector ring is D1, and the diameter of the winding core is D2, wherein 50%≤D1 / D2≤95%.

17. The battery according to claim 14, characterized in that Along the radial direction of the connecting ring, the distance between the outer side wall of the connecting ring and the bottom wall of the rolling groove is L1, wherein L1>0.3mm; and / or, Along the radial direction of the winding core, a distance between the outer side wall of the second collecting ring and the bottom wall of the rolling groove is L2, wherein L2>0.2 mm.

18. The battery according to any one of claims 1 to 9, characterized in that The top cover is provided with an annular thinned area.

19. The battery according to claim 18, characterized in that The inner diameters of the first sealing ring and the second sealing ring are both larger than the inner diameter of the annular thinned area.

20. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 19.

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