Sealing ring, button cell and electric device

Abstract

This application provides a sealing ring, a coin cell battery, and an electrical device, belonging to the field of battery technology. The sealing ring includes an inner ring, an outer ring, and a connecting wall. The outer ring is fitted onto the inner ring and spaced apart to define an annular cavity, which is configured to accommodate the negative electrode cap end of the coin cell battery. The connecting wall is located at one end of the annular cavity and connects the inner and outer rings. The inner ring is configured to fit over the positive electrode of the coin cell battery and radially limit the positive electrode along the sealing ring. Through this solution, the positive electrode can be constrained within the coin cell battery at a designated location by the sealing ring, ensuring the positive electrode's central position within the coin cell battery. This maintains good contact between the positive electrode and the positive electrode shell, effectively preventing internal short circuits, internal resistance fluctuations, voltage instability, and other adverse conditions caused by positive electrode misalignment. This improves the reliability of the coin cell battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a sealing ring, a button cell battery, and an electrical device. Background Technology

[0002] Button cells, with their small size and thinness, are widely used as power sources in various micro-electronic products. Examples include watches, keyless entry systems, smart cameras, digital cameras, dashcams, and vehicle monitoring systems. In the automotive field, button cells play a crucial power supply role in many subsystems, such as various vehicle sensors. For instance, in tire pressure monitoring systems (TPMS), button cells provide power to enable real-time monitoring of tire pressure, ensuring vehicle stability and reliability.

[0003] Currently, the internal resistance of button cells is prone to fluctuation, which can easily lead to unstable voltage and poor reliability. Summary of the Invention

[0004] This application provides a sealing ring, a button cell battery, and an electrical device, which ensures good internal electrical contact of the button cell battery and guarantees stable output performance of the button cell battery, thereby at least solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a sealing ring is provided, comprising an inner ring body, an outer ring body, and a connecting wall; the outer ring body is fitted onto the inner ring body and spaced apart to define an annular cavity, which is configured to accommodate the negative electrode cap end of a coin cell; the connecting wall is located at one end of the annular cavity and connects the inner ring body and the outer ring body; wherein the inner ring body is configured to fit onto the positive electrode of the coin cell and radially limit the positive electrode along the sealing ring. Thus, by fitting the inner ring body onto the positive electrode and radially limiting the positive electrode along the sealing ring, the positive electrode is constrained within the coin cell at a designated location, ensuring the positive electrode's centrality within the coin cell and maintaining good contact between the positive electrode and the positive electrode shell. This effectively prevents adverse conditions such as internal short circuits, internal resistance fluctuations, and voltage instability caused by positive electrode misalignment. Therefore, the reliability of the coin cell can be improved.

[0006] Optionally, the inner ring is configured to fit with the positive electrode of the coin cell through a gap. This reduces the difficulty of assembling the sealing ring and the positive electrode, and prevents the positive electrode from tilting due to the need to squeeze against the sealing ring during assembly. This helps to ensure the coaxiality of the positive electrode and other components of the coin cell, thereby ensuring the centering of the positive electrode inside the coin cell and improving the contact between the positive electrode and the positive electrode shell.

[0007] Optionally, the inner ring is configured to have a gap δD between it and the positive electrode, satisfying: 0 < δD ≤ 2.2 mm. This avoids the increased risk of material jamming and assembly difficulty caused by a lack of gap between the inner ring and the positive electrode, thus ensuring the coaxiality of the positive electrode and other components of the coin cell. It also avoids the situation where an excessively large gap between the inner ring and the positive electrode would reduce the radial limiting effect of the first ring facing the positive electrode.

[0008] Optionally, the gap δD satisfies: 1mm≤δD≤2mm. This ensures a suitable gap between the inner ring and the positive electrode, reducing the risk of material jamming in the positive electrode, improving the smoothness and efficiency of assembly between the positive electrode and the sealing ring, and guaranteeing the radial limiting effect of the inner ring on the positive electrode.

[0009] Optionally, the inner ring body has a first inner ring surface, the end of which extends obliquely towards the axis of the sealing ring away from the connecting wall. This causes the inner diameter of the first inner ring surface to gradually increase as it moves away from the negative electrode. Therefore, when assembling the positive electrode after pressing the sealing ring onto the negative electrode cover, this reduces the risk of the positive electrode jamming, facilitates a high degree of compatibility between the positive electrode and the sealing ring, and guides the installation of the positive electrode through the first inner ring surface, improving the centering of the positive electrode inside the coin cell and achieving a high-precision alignment of the positive electrode's axis relative to the coin cell's axis.

[0010] Optionally, the angle between the first inner ring surface and the axis of the sealing ring is α, satisfying: 1°≤α≤5.5°. This allows the first inner ring surface to have a suitable inclination to reduce the risk of material jamming and guide the positive electrode assembly, while also preventing the inclination of the first inner ring surface from being too large and affecting the size of the positive electrode.

[0011] Optionally, the included angle α satisfies: 2°≤α≤4°. This allows the first inner ring surface to have a suitable tilt to reduce the risk of material jamming and guide the positive electrode assembly, while also preventing the tilt of the first inner ring surface from being too large and affecting the size of the positive electrode.

[0012] Optionally, along the axial direction of the sealing ring, the outer ring has a height dimension H1, and the inner ring has a height dimension H2, satisfying: 29% H1 ≤ H2 ≤ 66% H1. This ensures, on the one hand, that the inner ring has sufficient height to accommodate the positive electrode, thereby improving the radial restraint of the positive electrode by the inner ring; on the other hand, it avoids the inner ring's excessive height from affecting the arrangement of the electrode assembly, reducing the difficulty of molding the coin cell.

[0013] Optionally, the height dimension H2 satisfies: 40% H1≤H2≤60% H1. This ensures that the inner ring formed has a sufficient height dimension to fit the positive electrode, so that the inner ring has a good radial limiting effect on the positive electrode, while avoiding the inner ring being too large and affecting the arrangement of the electrode assembly, thus ensuring the ease of forming the coin cell.

[0014] Optionally, along the axial direction of the sealing ring, the outer ring body has a height dimension H1, and the connecting wall has a height dimension H3, satisfying: 15.3% H1 ≤ H3 ≤ 25.6% H1. This ensures that the connecting wall has sufficient dimensions to guarantee its structural strength and sufficient axial compression to form adequate compression deformation, thereby ensuring a tight fit between the negative electrode cover and the sealing ring with good sealing performance. It also avoids problems such as assembly difficulty and material jamming caused by excessive connecting wall thickness.

[0015] Optionally, the height dimension H3 of the connecting wall satisfies: 18% H1≤H3≤21% H3. This ensures that the connecting wall has sufficient dimensions to guarantee its structural strength and sufficient axial compression to form adequate compression deformation, thereby ensuring a tight fit between the negative electrode cover and the sealing ring and good sealing performance. It also avoids problems such as difficult assembly and material jamming caused by excessive thickness of the connecting wall.

[0016] Optionally, the outer ring body has a first outer ring surface, the end of which extends obliquely away from the connecting wall in a direction away from the axis of the sealing ring. This oblique setting of the outer ring surface facilitates smooth demolding after injection molding of the sealing ring, avoids sealing ring sticking and tearing, reduces the defect rate and debugging difficulty of the sealing ring, shortens the development and production cycle, and improves production efficiency.

[0017] Optionally, the first outer ring surface and the axis of the sealing ring have an included angle β, satisfying: 0.5°≤β≤3.8°. This allows the first outer ring surface to tilt sufficiently, facilitating smooth demolding, while also preventing excessive material fatigue due to excessive deformation when the sealing ring seals the negative electrode cap and positive electrode shell caused by an excessively large tilt angle of the first outer ring surface.

[0018] Optionally, the included angle β satisfies: 1.5°≤β≤2.5°. This ensures that the first outer ring surface is sufficiently tilted, facilitating smooth demolding, while also preventing excessive material fatigue due to excessive deformation when the sealing ring seals the negative electrode cap and positive electrode shell caused by an excessively large tilt angle of the first outer ring surface.

[0019] Optionally, the outer ring body has a second inner ring surface, which is parallel to the first outer ring surface. This makes the outer ring body have a uniform thickness, which helps to improve the uniformity of stress on the outer ring body and improve the durability of the sealing ring.

[0020] Optionally, along the axial direction of the sealing ring, the outer ring body has a height dimension of H1, and the thickness of the end of the inner ring body away from the connecting wall is D0, satisfying: 5.23% H1≤D0≤8.49%H1; thus, the end of the inner ring body away from the connecting wall has an appropriate thickness, which can ensure smooth demolding during injection molding of the sealing ring, reduce the risk of burrs at the end of the inner ring body away from the connecting wall, and at the same time ensure the structural strength of the inner ring body to maintain the stable centering of the positive electrode;

[0021] And / or, the inner ring body has a second outer ring surface, which is configured to be spaced apart from the end of the negative electrode cap; in this way, the volume of the sealing ring can be reduced, so as to allow more electrolyte to be filled into the coin cell and improve battery reliability.

[0022] Optionally, the inner ring, outer ring, and connecting wall are integrally molded. This improves the structural strength of the sealing ring, thereby enhancing the sealing performance of the button cell.

[0023] Optionally, the inner ring body has a second outer ring surface, the end of which extends obliquely towards the axis of the sealing ring away from the connecting wall. This increases the volume of the annular cavity, allowing for more electrolyte to be filled into the coin cell and improving battery reliability.

[0024] Optionally, the inner ring body further has a first inner ring surface, the end of the first inner ring surface away from the connecting wall extending obliquely towards the axis of the sealing ring, and the angle of inclination of the second outer ring surface relative to the axis of the sealing ring is greater than the angle of inclination of the first inner ring surface relative to the axis of the sealing ring. This causes the thickness of the inner ring body to gradually decrease as it moves away from the connecting wall, thereby increasing the elasticity of the inner ring body as the distance between it and the positive electrode decreases. This helps to reduce the compressive force exerted on the positive electrode by the end of the inner ring body away from the connecting wall at high temperatures, improving the stress state of the positive electrode and thus enhancing the reliability of the coin cell.

[0025] According to a second aspect of this application, a button cell battery is provided, comprising a negative electrode cap, a positive electrode shell, an electrode assembly, and the aforementioned sealing ring; the positive electrode shell is sleeved on one end of the negative electrode cap to define a receiving cavity; an outer ring is disposed between the negative electrode cap and the positive electrode shell, and a connecting wall is located between the end of the negative electrode cap and the bottom wall of the positive electrode shell to insulate and isolate the negative electrode cap from the positive electrode shell and seal the receiving cavity; an inner ring is located inside the negative electrode cap; the electrode assembly includes a negative electrode, a separator, and a positive electrode sequentially stacked in the receiving cavity from the negative electrode cap toward the positive electrode shell; wherein the inner ring surrounds the positive electrode. Thus, by setting the inner ring to sleeve the positive electrode and making the inner ring radially limit the positive electrode along the sealing ring, the positive electrode is constrained to a designated position within the button cell by the sealing ring, ensuring the positive electrode's centrality within the button cell, maintaining good contact between the positive electrode and the positive electrode shell, and effectively avoiding adverse conditions such as internal short circuits, internal resistance fluctuations, and voltage instability caused by positive electrode misalignment. This can improve the reliability of button cells.

[0026] According to a third aspect of this application, an electrical device is provided, comprising the aforementioned button cell battery. By providing an inner ring fitted over the positive electrode and radially limiting the positive electrode along a sealing ring, the positive electrode is constrained within the button cell by the sealing ring, ensuring its central positioning within the battery. This maintains good contact between the positive electrode and its casing, effectively preventing internal short circuits, internal resistance fluctuations, voltage instability, and other adverse conditions caused by positive electrode misalignment. This improves the reliability of the button cell battery, thereby enhancing the reliability of the electrical device.

[0027] In the sealing ring of this embodiment, an inner ring is fitted onto the positive electrode, and the inner ring radially limits the positive electrode. This confines the positive electrode to a designated position within the coin cell, ensuring its central positioning and maintaining good contact with the positive electrode shell. This effectively prevents internal short circuits, internal resistance fluctuations, and voltage instability caused by positive electrode misalignment. Thus, the reliability of the coin cell is improved.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0031] Figure 1 This is a structural block diagram of the electrical equipment provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of a button battery provided in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structure of the sealing ring provided in an exemplary embodiment of this application; Figure 4 This is a schematic diagram of the sealing ring and the positive electrode in an exemplary embodiment of this application; Figure 5 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0032] Explanation of reference numerals in the attached figures: 1000 - Electrical equipment; 100-button cell battery; 10-Sealing ring; 11-Inner ring body; 111-First inner ring surface; 112-Second outer ring surface; 12-Outer ring body; 121-First outer ring surface; 122-Second inner ring surface; 13-Connecting wall; 14-Annular space; 21-Negative electrode cap; 22-Positive electrode shell; 23-Electrode assembly; 231-Negative electrode; 232-Separator; 233-Positive electrode; 24-Receiving cavity. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0034] Before introducing the sealing ring, button battery and electrical device provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0035] In related technologies, button cells mainly include a casing assembly and an electrode assembly disposed within the casing assembly. The casing assembly includes a positive electrode shell (also known as a positive electrode housing or steel shell), a negative electrode cap (also known as a bottom cap), and a sealing ring (also known as a rubber ring). The positive electrode shell and the negative electrode cap are fitted together to define a receiving cavity. The sealing ring is disposed between the positive electrode shell and the negative electrode cap to seal the mating parts between the positive electrode shell and the negative electrode cap and to insulate and isolate the positive electrode shell and the negative electrode cap. From the negative electrode cap towards the positive electrode shell, the electrode assembly includes a negative electrode (also known as a negative electrode plate), a separator, and a positive electrode (also known as a positive electrode plate) sequentially disposed in the receiving cavity. The receiving cavity is filled with an electrolyte to provide conditions for the reaction between the positive and negative electrodes.

[0036] In the design and application of button cells, positive electrode misalignment can cause a series of problems, leading to lower reliability of button cells. These problems mainly involve two core areas of battery performance: 1. Isolation Positive electrode misalignment reduces the isolation stability between the positive and negative electrodes and increases the risk of internal short circuits. 2. Electrical performance Positive electrode misalignment can lead to poor internal contact in coin cells, resulting in increased internal resistance, reduced electrical performance, and consequently, decreased battery capacity and shortened lifespan.

[0037] The following are some examples illustrating certain scenarios related to the above issues: 1. In the high-speed production of button cells, the negative electrode, separator, and positive electrode are first assembled sequentially onto the negative electrode cover. Then, electrolyte is injected, and the negative electrode cover and positive electrode shell are sealed with a sealing ring to form a button cell. After assembly, the button cells undergo pre-discharge aging. However, during the process of assembling the positive electrode onto the negative electrode cover, the positive electrode is prone to misalignment, resulting in poor centering of the positive electrode within the negative electrode cover. This leads to poor consistency in the overall cell height and edge height of the button cells produced after the sealing process, and also results in a large gap between the positive electrode shell and the positive electrode, causing poor internal contact and thus poor internal resistance. 2. During the sealing process of button cells, the internal materials (mainly the positive electrode, negative electrode, and separator) are subjected to sealing pressure. If the positive electrode is not centered, the pressure will exacerbate the offset of the positive electrode when the positive electrode shell and negative electrode cap are fitted together by the sealing ring to complete the sealing. This will cause a local gap between the positive electrode and the positive electrode shell, reducing the effective contact area between them. Consequently, this will lead to poor internal contact and increased internal resistance of the button cell, ultimately resulting in unstable electrical performance and a decline in overall performance.

[0038] 3. In tire pressure monitoring systems (TPMS), button cell batteries face numerous challenges, such as continuous vibration. This can easily cause the positive terminal of the button cell to shift, leading to fluctuations in the internal resistance and consequently, voltage instability, reducing battery reliability. This can result in signal transmission failures within the TPMS, or even generate erroneous signals causing false alarms.

[0039] For example, during the trial production of a lithium-ion coin cell, a misalignment of the positive electrode resulted in a reduction of approximately 30% in the contact area between the positive and negative electrode caps after sealing, and even an increase of over 15% in the internal resistance of some coin cells. This led to a significant reduction in the cycle life of the coin cells.

[0040] Based on this, embodiments of this application provide a sealing ring, a coin cell battery, and an electrical device. By designing a structure in which the sealing ring mates with the positive electrode, the sealing ring constrains the positive electrode to a designated position within the coin cell, ensuring it maintains good centering within the battery and maintains good contact with the positive electrode casing. This prevents internal short circuits or performance fluctuations caused by positive electrode misalignment. Furthermore, this sealing ring facilitates stable positioning of the positive electrode after sealing, ensuring tight contact between the positive electrode and the bottom surface of the positive electrode casing, improving the interfacial conductivity between the positive electrode and the positive electrode casing, and enhancing the consistency of the overall electrical performance of the coin cell battery. This improves the reliability of the coin cell battery.

[0041] The following combination Figures 1 to 5 The present application provides a detailed description of a sealing ring 10, a button cell battery 100, and an electrical device 1000, respectively, based on the embodiments of the present application.

[0042] Please see Figure 1 An embodiment of this application provides an electrical device 1000, which includes a button cell battery 100.

[0043] It is understood that electrical equipment 1000 can include, but is not limited to, watches, headphones, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0044] It's understandable that 100-cell button batteries, with their small size, high single-cell voltage, moderate energy density, and stable discharge, are suitable for power consumption scenarios requiring miniaturization, low power consumption, and long standby time. Examples include various sensors, including but not limited to temperature and humidity sensors for cold chain transportation, pressure sensors for pipeline pressure detection, smoke sensors for environmental smoke detection, position sensors for door and window opening / closing, and speed detection sensors. Another example is portable medical devices, including but not limited to electronic thermometers, blood glucose meters, hearing aids, heart rate monitors, and sleep monitors.

[0045] Specifically, the button cell battery 100 is used in automobiles, such as tire pressure monitoring sensors and car keys.

[0046] Please see Figure 2 This application provides a coin cell battery 100. The coin cell battery 100 includes a negative electrode cap 21, a positive electrode shell 22, an electrode assembly 23, and a sealing ring 10. The positive electrode shell 22 is fitted onto one end of the negative electrode cap 21 to define a receiving cavity 24. The outer ring 12 of the sealing ring 10 is disposed between the negative electrode cap 21 and the positive electrode shell 22. The connecting wall 13 of the sealing ring 10 is located between the end of the negative electrode cap 21 and the bottom wall of the positive electrode shell 22 to insulate the negative electrode cap 21 from the positive electrode shell 22 and seal the receiving cavity 24. The inner ring 11 of the sealing ring 10 is located inside the negative electrode cap 21. The electrode assembly 23 includes a negative electrode 231, a separator 232, and a positive electrode 233 sequentially stacked in the receiving cavity 24 from the negative electrode cap 21 towards the positive electrode shell 22. The inner ring 11 of the sealing ring 10 surrounds the positive electrode 233.

[0047] It is understood that the cavity 24 is filled with electrolyte. The positive electrode 233, the negative electrode 231, and the separator 232 that insulates and isolates the positive electrode 233 and the negative electrode 231 are stacked in sequence and tightly attached, and together with the electrolyte, they complete the electrochemical reaction.

[0048] The positive electrode 233 can be either a ring-type positive electrode 233 or a non-ring-type positive electrode 233. This ring is a collector ring, which helps to improve the current flow capacity between the positive electrode 233 and the positive electrode shell 22. When the positive electrode 233 is a ring-type positive electrode 233, the collector ring is formed by stamping, and the collector ring is stamped and assembled with the powder cake of the formed positive electrode 233.

[0049] It is understood that both the negative electrode cap 21 and the positive electrode shell 22 are conductors, and both are materials with good conductivity, resistance to electrolyte corrosion, and compatibility with the active materials inside the coin cell 100. For example, the negative electrode cap 21 can be a steel shell, specifically a steel shell with lithium plating on the inner surface and nickel plating on the outer surface, a zinc alloy shell, etc. The positive electrode shell 22 can be a steel shell, specifically a nickel-plated steel shell, a stainless steel shell, a copper-plated steel shell, etc. Specifically, the negative electrode cap 21 and the positive electrode shell 22 are a type of stainless steel, and both are integrally stamped and independently formed. The negative electrode cap 21 and the sealing ring 10 are combined and formed by a positioning and pressing process, so that the negative electrode cap 21 and the sealing ring 10 are integrated into one piece to form the negative electrode 231 combined cap. During the assembly of the coin cell 100, the negative electrode 231 is placed in the negative electrode 231 combined cap, and the negative electrode 231, the separator 232, and the positive electrode 233 are placed in sequence. Electrolyte is injected, the positive electrode shell 22 is capped, and finally the coin cell 100 is sealed. After assembly, the button cell 100 undergoes pre-discharge aging.

[0050] Specifically, the circumferential portion of the negative electrode cover 21 is bent to form a step, such that the diameter of the opening end of the negative electrode cover 21 on one side of the step is larger than the diameter of the portion of the negative electrode cover 21 on the other side of the step. The periphery of the positive electrode shell 22 is covered by a sealing ring 10, and the outer ring 12 of the sealing ring 10 away from the connecting wall 13 is covered on the step, thereby causing the negative electrode cover 21 and the positive electrode shell 22 to stop and engage in the axial direction of the button cell 100, forming a snap-fit ​​structure, thereby encapsulating the button cell 100.

[0051] Please see Figure 3 and Figure 4 This application provides a sealing ring 10. The sealing ring 10 includes an inner ring body 11, an outer ring body 12, and a connecting wall 13. The outer ring body 12 is sleeved on the inner ring body 11 and spaced apart from the inner ring body 11 to define an annular cavity 14. The annular cavity 14 is configured to accommodate the end of the negative electrode cap 21 of the coin cell battery 100. The connecting wall 13 is located at one end of the annular cavity 14 and connects the inner ring body 11 and the outer ring body 12. The inner ring body 11 is configured to sleeve on the positive electrode 233 of the coin cell battery 100 and to limit the positive electrode 233 radially along the sealing ring 10.

[0052] It is understood that the sealing ring 10 is made of elastic rubber or resin. Specifically, the material of the sealing ring 10 is either polypropylene or polytetrafluoroethylene.

[0053] For example, the inner ring 11, the outer ring 12, and the connecting wall 13 are integrally formed. Specifically, the sealing ring 10 is formed in one piece using an injection molding process.

[0054] In this embodiment, by setting an inner ring 11 to be fitted onto the positive electrode 233, and making the inner ring 11 radially limit the positive electrode 233 along the sealing ring 10, the positive electrode 233 is constrained within the button cell 10 by the sealing ring 10, ensuring the centering of the positive electrode 233 inside the button cell 100. This ensures good contact between the positive electrode 233 and the positive electrode shell 22, effectively preventing adverse conditions such as internal short circuits, internal resistance fluctuations, and voltage instability caused by the misalignment of the positive electrode 233. Thus, the reliability of the button cell 100 can be improved.

[0055] Furthermore, by limiting the positive electrode 233 through the inner ring 11 of the sealing ring 10, after the button cell 100 is sealed, it is beneficial to ensure that the positive electrode 233 is stably in the set position, so as to ensure the tight contact between the positive electrode 233 and the bottom surface of the positive electrode shell 22, improve the conductivity between the positive electrode 233 and the positive electrode shell 22, thereby improving the consistency of the overall electrical performance of the button cell 100.

[0056] In addition, by limiting the positive electrode 233 through the inner ring 11 of the sealing ring 10, the vibration resistance of the button cell 100 can be effectively improved. Thus, under harsh scenarios such as transportation, vibration, and rolling, the internal electrical contact of the button cell 100 can be effectively maintained, ensuring the stable output of the button cell 100 and improving the reliability of related electrical equipment 1000.

[0057] Please see Figure 2 In some embodiments, the inner ring 11 is configured to have a clearance fit with the positive electrode 233 of the coin cell 100. This reduces the difficulty of assembling the sealing ring 10 and the positive electrode 233, and prevents the positive electrode 233 from tilting due to the need to squeeze against the sealing ring 10 during assembly. This helps to ensure the coaxiality of the positive electrode 233 with other components of the coin cell 100, thereby ensuring the centering of the positive electrode 233 inside the coin cell 100 and improving the contact between the positive electrode 233 and the positive electrode shell 22.

[0058] Please see Figure 5 In some embodiments, the inner ring 11 is configured to have a gap δD between it and the positive electrode 233, satisfying: 0 < δD ≤ 2.2 mm. This avoids the increased risk of material jamming and assembly difficulty caused by a lack of gap between the inner ring 11 and the positive electrode 233, thus ensuring the coaxiality of the positive electrode 233 and other components of the coin cell 100. It also avoids the first ring face from reducing its radial limiting effect on the positive electrode 233 if the gap between the inner ring 11 and the positive electrode 233 is too large.

[0059] It is understood that the gap δD includes, but is not limited to, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.1mm, 1.3mm, 1.4mm, 1.6mm, 1.7mm, 1.9mm, 2.0mm, 2.05mm, 2.1mm, 2.15mm, and 2.2mm.

[0060] In some embodiments, the gap δD satisfies: 1mm≤δD≤2mm. This ensures that there is a suitable gap between the inner ring 11 and the positive electrode 233, which helps reduce the risk of the positive electrode 233 getting stuck and improves the smoothness and efficiency of the assembly of the positive electrode 233 and the sealing ring 10. It also ensures that the inner ring 11 provides radial restraint for the positive electrode 233.

[0061] It is understood that the gap δD includes, but is not limited to, 1mm, 1.03mm, 1.06mm, 1.09mm, 1.1mm, 1.14mm, 1.17mm, 1.2mm, 1.23mm, 1.26mm, 1.29mm, 1.3mm, 1.34mm, 1.37mm, 1.4mm, 1.43mm, 1.46mm, 1.49mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.93mm, 1.96mm, and 2mm.

[0062] Please see Figure 3 and Figure 5 In some embodiments, the inner ring 11 has a first inner ring surface 111, the end of which extends obliquely toward the axis of the sealing ring 10 away from the connecting wall 13. This causes the inner diameter of the first inner ring surface 111 to gradually increase as it moves away from the negative electrode 231. Therefore, when assembling the positive electrode 233 after pressing the sealing ring 10 onto the negative electrode cover 21, this reduces the risk of the positive electrode 233 getting stuck, promotes a high degree of compatibility between the positive electrode 233 and the sealing ring 10, and guides the installation of the positive electrode 233 through the first inner ring surface 111, improving the centering of the positive electrode 233 inside the button cell 100 and achieving a high-precision centering effect of the axis of the positive electrode 233 relative to the axis of the button cell 100.

[0063] In addition, the fact that the end of the first inner ring surface 111 away from the connecting wall 13 extends obliquely toward the axis of the sealing ring 10 also helps the button cell 100 to effectively avoid the positive electrode 233 shifting when facing extreme conditions, thereby avoiding abnormal internal resistance of the button cell 100 and improving the reliability of the button cell 100.

[0064] Please see Figure 3 In some embodiments, the included angle between the first inner ring surface 111 and the axis of the sealing ring 10 is α, satisfying: 1°≤α≤5.5°. In this way, the first inner ring surface 111 can have a suitable inclination to reduce the risk of material jamming and guide the assembly of the positive electrode 233, while also avoiding the first inner ring surface 111 being too inclination to affect the size of the positive electrode 233.

[0065] It can be understood that the included angle α includes, but is not limited to, 1.0°, 1.2°, 1.4°, 1.6°, 1.8°, 2.0°, 2.2°, 2.4°, 2.6°, 2.8°, 3.0°, 3.1°, 3.3°, 3.5°, 3.7°, 3.9°, 4.0°, 4.2°, 4.4°, 4.5°, 4.6°, 4.7°, 4.8°, 4.9°, 5.0°, 5.1°, 5.2°, 5.3°, 5.4°, and 5.5°.

[0066] In some embodiments, the included angle α satisfies: 2°≤α≤4°. This allows the first inner ring surface 111 to have a suitable tilt to reduce the risk of material jamming and guide the assembly of the positive electrode 233, while also preventing the tilt of the first inner ring surface 111 from being too large and affecting the size of the positive electrode 233.

[0067] It is understood that the included angle α includes, but is not limited to, 2.00°, 2.07°, 2.10°, 2.17°, 2.20°, 2.27°, 2.30°, 2.37°, 2.40°, 2.47°, 2.50°, 2.57°, 2.60°, 2.67°, 2.70°, 2.77°, 2.80°, 2.87°, 2.90°, 2.97°, 3.00°, 3.08°, 3.10°, 3.18°, 3.20°, 3.30°, 3.40°, 3.60°, 3.80°, and 4.00°.

[0068] Please see Figure 3 In some embodiments, along the axial direction of the sealing ring 10, the outer ring 12 has a height dimension H1, and the inner ring 11 has a height dimension H2, satisfying: 29% H1≤H2≤66% H1.

[0069] It is understandable that once the model of the button cell 100 is determined, its external dimensions, such as height and diameter, are also fixed. Correspondingly, the dimensions of the outer ring 12 are also fixed.

[0070] It is understood that the height dimension H2 includes, but is not limited to, 29%H1, 30%H1, 31%H1, 32%H1, 34%H1, 35%H1, 36%H1, 37%H1, 39%H1, 40%H1, 41%H1, 42%H1, 44%H1, 45%H1, 46%H1, 47%H1, 49%H1, 50%H1, 51%H1, 52%H1, 54%H1, 55%H1, 56%H1, 57%H1, 59%H1, 60%H1, 62%H1, 63%H1, 65%H1, and 66%H1.

[0071] In this embodiment, by limiting the height dimension H2 of the inner ring 11, on the one hand, the inner ring 11 formed has a sufficient height dimension to adapt to the positive electrode 233, thereby improving the radial limiting of the inner ring 11 on the positive electrode 233. On the other hand, it avoids the inner ring 11 being too large and affecting the arrangement of the electrode assembly 23, and reduces the difficulty of forming the button cell 100.

[0072] Please see Figure 3 In some embodiments, the height dimension H2 satisfies: 40% H1 ≤ H2 ≤ 60% H1. This ensures that the inner ring 11 has a sufficient height dimension to fit the positive electrode 233, so that the inner ring 11 has a good radial limiting effect on the positive electrode 233, while avoiding the inner ring 11 being too large and affecting the arrangement of the electrode assembly 23, thus ensuring the ease of forming the button cell 100.

[0073] It is understood that the height dimension H2 includes, but is not limited to, 40%H1, 41%H1, 42%H1, 44%H1, 45%H1, 46%H1, 47%H1, 49%H1, 50%H1, 51%H1, 52%H1, 54%H1, 55%H1, 56%H1, 57%H1, 59%H1, and 60%H1.

[0074] For example, the height dimension H2 is 45% of H1.

[0075] Please see Figure 3 In some embodiments, along the axial direction of the sealing ring 10, the outer ring 12 has a height dimension H1, and the connecting wall 13 has a height dimension H3, satisfying: 15.3% H1 ≤ H3 ≤ 25.6% H1. This ensures that the connecting wall 13 has sufficient dimensions to guarantee its structural strength and sufficient axial compression to form adequate compression deformation, thereby ensuring a tight fit between the negative electrode cover 21 and the sealing ring 10 with good sealing performance. It also avoids problems such as assembly difficulty and material jamming caused by excessive thickness of the connecting wall 13.

[0076] It is understood that the height dimension H3 of the connecting wall 13 includes, but is not limited to, 15.3%H1, 15.6%H1, 15.9%H1, 16.2%H1, 16.5%H1, 16.8%H1, 17.1%H1, 17.4%H1, 17.7%H1, 18.0%H1, 18.3%H1, 18.6%H1, 18.9%H1, and 19.2%. %H1, 19.5%H1, 19.8%H1, 20.1%H1, 20.4%H1, 20.7%H1, 21.0%H1, 21.5%H1, 22.0%H 1. 22.5%H1, 23.0%H1, 23.5%H1, 24.0%H1, 24.5%H1, 25.0%H1, 25.3%H1, 25.6%H1.

[0077] Please see Figure 3 In some embodiments, the height dimension H3 of the connecting wall 13 satisfies: 18% H1 ≤ H3 ≤ 21% H3. This ensures that the connecting wall 13 has sufficient dimensions to guarantee its structural strength and sufficient axial compression to form adequate compression deformation, thereby ensuring a tight fit between the negative electrode cover 21 and the sealing ring 10 with good sealing performance. It also avoids problems such as difficult assembly and material jamming caused by excessive thickness of the connecting wall 13.

[0078] It is understood that the height dimension H3 of the connecting wall 13 includes, but is not limited to, 18%H1, 18.3%H1, 18.6%H1, 18.9%H1, 19.2%H1, 19.5%H1, 19.8%H1, 20.1%H1, 20.4%H1, 20.7%H1, and 21%H1.

[0079] For example, the height dimension H3 of the connecting wall 13 is 19.2% of H1.

[0080] Please see Figure 3 In some embodiments, the outer ring body 12 has a first outer ring surface 121, the end of the first outer ring surface 121 away from the connecting wall 13 extending obliquely away from the axis of the sealing ring 10. This oblique arrangement of the outer ring surface of the outer ring body 12 facilitates smooth demolding after injection molding of the sealing ring 10, avoids sticking and tearing of the sealing ring 10, reduces the defect rate and debugging difficulty of the sealing ring 10, shortens the development and production cycle, and improves production efficiency.

[0081] Please see Figure 3In some embodiments, the first outer annular surface 121 and the axis of the sealing ring 10 have an included angle β, satisfying: 0.5°≤β≤3.8°. This allows the first outer annular surface 121 to tilt sufficiently, facilitating smooth demolding, while also preventing excessive material fatigue due to excessive deformation when the sealing ring 10 seals the negative electrode cover 21 and the positive electrode shell 22, caused by an excessively large tilt angle of the first outer annular surface 121.

[0082] It is understood that the included angle β includes, but is not limited to, 0.5°, 0.65°, 0.8°, 0.95°, 1.1°, 1.22°, 1.35°, 1.5°, 1.68°, 1.8°, 1.95°, 2.1°, 2.24°, 2.35°, 2.5°, 2.66°, 2.8°, 2.93°, 3.0°, 3.12°, 3.2°, 3.35°, 3.4°, 3.51°, 3.6°, 3.68°, 3.7°, 3.73°, 3.76°, and 3.8°.

[0083] Please see Figure 3 In some embodiments, the included angle β satisfies: 1.5°≤β≤2.5°. This ensures that the first outer ring surface 121 is tilted sufficiently to facilitate demolding, while also preventing excessive material fatigue caused by excessive deformation when the sealing ring 10 seals the negative electrode cover 21 and the positive electrode shell 22 due to an excessively large tilt angle of the first outer ring surface 121.

[0084] Please see Figure 3 In some embodiments, the outer ring 12 has a second inner ring surface 122, which is arranged parallel to the first outer ring surface 121. This makes the outer ring 12 have a uniform thickness, which helps to improve the uniformity of stress on the outer ring 12 and improve the durability of the sealing ring 10.

[0085] Please see Figure 3 In some embodiments, along the axial direction of the sealing ring 10, the outer ring 12 has a height dimension of H1, and the thickness of the end of the inner ring 11 away from the connecting wall 13 is D0, satisfying: 5.23% H1 ≤ D0 ≤ 8.49% H1. This ensures that the end of the inner ring 11 away from the connecting wall 13 has a suitable thickness, thereby ensuring smooth demolding of the sealing ring 10 during injection molding, reducing the risk of burrs forming at the end of the inner ring 11 away from the connecting wall 13, and simultaneously guaranteeing the structural strength of the inner ring 11 to maintain the stable centering of the positive electrode 233.

[0086] Please see Figure 3 and Figure 5 In some embodiments, the inner ring 11 has a second outer ring surface 112. The second outer ring surface 112 is configured to be spaced apart from the end of the negative electrode cap 21. This reduces the volume of the sealing ring 10, allowing more electrolyte to be filled into the coin cell 100 and improving battery reliability.

[0087] In some embodiments, the inner ring 11, the outer ring 12, and the connecting wall 13 are integrally formed. This improves the structural strength of the sealing ring 10, thereby enhancing the sealing performance of the button cell 100.

[0088] Please see Figure 3 and Figure 5 In some embodiments, the inner ring 11 has a second outer ring surface 112, the end of which extends obliquely toward the axis of the sealing ring 10 away from the connecting wall 13. This increases the volume of the annular space 14, allowing for more electrolyte to be filled into the coin cell 100, thus improving battery reliability.

[0089] Please see Figure 3 and Figure 5 In some embodiments, the inner ring 11 further has a first inner ring surface 111, the end of the first inner ring surface 111 away from the connecting wall 13 extending obliquely towards the axis of the sealing ring 10, and the second outer ring surface 112 is inclined at an angle greater than the angle of the first inner ring surface 111 relative to the axis of the sealing ring 10. This causes the thickness of the inner ring 11 to gradually decrease in the direction away from the connecting wall 13, thereby increasing the elasticity of the inner ring 11 as the distance between it and the positive electrode 233 decreases. This helps to reduce the compressive force on the positive electrode 233 at the end of the inner ring 11 away from the connecting wall 13 under high temperature conditions, improving the stress state of the positive electrode 233 and thus enhancing the reliability of the coin cell 100.

[0090] Please see Figure 5 In some embodiments, the end of the negative electrode cap 21 is spaced apart from the inner ring 11. This prevents the negative electrode cap 21 from pressing against the inner ring 11 and provides buffer space for the radial outward expansion of the inner ring 11, thereby improving the internal stress state of the coin cell 100.

[0091] Please see Figure 5 In some embodiments, the edge of the diaphragm 232 is inclined toward the annular space 14. This increases the radial dimension of the diaphragm 232, thereby improving the reliability of the diaphragm 232 in isolating the positive electrode 233 and the negative electrode 231.

[0092] The technical solutions and effects of this application will be described in detail below through specific embodiments. These embodiments are merely some examples of this application and are not intended to limit the scope of this application. The embodiments described below are only for the purpose of helping to understand this application and should not be considered as limitations thereof.

[0093] This embodiment aims to examine the effect of radially limiting the positive electrode 233 through the inner ring 11 on the performance of the button cell 100.

[0094] The specific details of the test content for the embodiment are as follows: I. Test-related instructions 1. Test Sample Description The test sample is a button cell 100. The partial fitting parameters between the positive electrode shell 22 and the negative electrode cover 21 are as follows: the shortest distance between the stepped part of the negative electrode cover 21 and the opening of the positive electrode shell 22 is G1=0.33mm, the shortest distance between the positive electrode shell 22 and the negative electrode cover 21 is G2=0.30mm, the shortest distance between the end of the negative electrode cover 21 and the bottom of the positive electrode shell 22 is G3=0.5mm, and the corner radius R of the sealing part of the positive electrode shell 22 is 1.0mm.

[0095] 2. Test Subject 1) Internal resistance The internal resistance of the coin cell 100 was evaluated through a combination of high-temperature storage and vibration testing, thereby assessing the changes in its internal resistance under extreme environmental temperatures and continuous vibration. Specifically, the internal resistance between the positive electrode 233 and the negative electrode 231 of the coin cell 100 was first measured as the initial resistance of the coin cell 100. Next, the coin cell 100 was stored at 85°C for two weeks in a high-temperature chamber and subjected to vibration testing. After one week of storage, the internal resistance between the positive electrode 233 and the negative electrode 231 of the coin cell 100 was measured, and this value was taken as the internal resistance after the test.

[0096] The vibration test adopted the UN 38.3 T3 vibration test method, as detailed below: (1) Vibration type: random vibration.

[0097] (2) Frequency range: 7 Hz - 200 Hz.

[0098] (3) Power spectral density (PSD): From 7 Hz to 20 Hz, PSD is 0.01 g² / Hz (slope increases); From 20 Hz to 200 Hz, PSD is 0.02 g² / Hz (constant).

[0099] (4) Total root mean square acceleration: approximately 1.1 grms.

[0100] (5) Vibration direction: three mutually perpendicular axes (usually X-axis, Y-axis, Z-axis).

[0101] (6) Duration: 3 hours for each axis, for a total of 9 hours.

[0102] 2) Capacity The core of coin cell battery capacity testing is constant current discharge. Using a charge / discharge tester, the coin cell battery is discharged with a constant current until its voltage drops to a set cutoff voltage. By recording the time taken for the entire discharge process, the capacity of the coin cell battery can be calculated.

[0103] The formula for calculating the capacity of a 100-cell button cell is: Capacity C = Discharge current I × Discharge time t.

[0104] 3. Testing Process (1) Select 100 button cells Before testing, the button cell 100 must undergo visual inspection, voltage and internal resistance measurement, and the data must be recorded.

[0105] (2) Fixed Securely mount the button cell 100 onto the vibration table of the vibration tester to ensure that vibration energy is effectively transferred to the button cell 100. For example, a rigid bracket can be used for fixation. Specifically, the button cell 100 can be fixed to the table surface with clamps or adhesives (such as beeswax), ensuring that there are no unnecessary gaps or buffers between the button cell 100 and the table surface.

[0106] (3) Set test parameters Enter the selected test standard parameters (such as the random vibration spectrum of UN 38.3 above) into the vibration control system.

[0107] Set the vibration direction, duration, and safety limits (such as interruption conditions).

[0108] (4) Conduct the test Start the vibration table and perform tests sequentially along three mutually perpendicular axes according to the set parameters.

[0109] During the test, the vibration tester records the actual vibration spectrum to ensure that it is consistent with the set spectrum.

[0110] (5) After the test Visual inspection: After the test, check whether the button cell battery 100 has obvious damage such as leakage, smoke, fire, explosion, cracked or deformed casing.

[0111] Electrical performance testing: After the test, measure the voltage and internal resistance of the coin cell 100 again within a certain period of time (e.g., 1 hour or the time specified by the standard). Compared with the data before the test, the voltage drop should not exceed the specified value (UN38.3 requires that the voltage drop not exceed 0.1V or a specific percentage of the initial voltage).

[0112] Other analysis: As needed, the button cell 100 was disassembled to check whether the internal electrodes and separator 232 were displaced, short-circuited or damaged.

[0113] II. Test Comparison Table The following test comparison table was obtained through the above tests.

[0114]

[0115] Table 1. Comparison of Test Results As shown in Table 1, the ratios of H2 and H1 and H3 and H1 in Examples 1 and 2 are not within the scope of this application, while the ratios of H2 and H1 and H3 and H1 in Examples 3 to 12 are within the scope of this application.

[0116] When the ratios of H2 and H1, and H3 and H1, are not within the limits defined in this application, the coin cell 100 has a large internal resistance and a low capacity. Furthermore, after vibration and high-temperature testing, the internal resistance of the coin cell 100 increases significantly.

[0117] When the ratios of H2 and H1, and H3 and H1, are within the limits defined in this application, the internal resistance of the coin cell 100 is low, and the capacity is increased. Furthermore, after vibration and high-temperature testing, the increase in internal resistance of the coin cell 100 is minimal.

[0118] The above results demonstrate that the coin cell 100 provided in this application can effectively ensure good internal contact under harsh conditions such as transportation, vibration, and tumbling, thereby guaranteeing stable performance output. Furthermore, it effectively prevents poor internal contact caused by deformation of the negative electrode cap 21 and positive electrode shell 22 due to thermal expansion of the sealing ring 10 in high-temperature environments. Therefore, the coin cell 100 provided in this application exhibits more stable performance.

[0119] In the description of this application, 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0120] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0121] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0122] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A sealing ring (10), characterized in that, include: Inner ring body (11); An outer ring (12) is fitted onto the inner ring (11) and spaced apart from the inner ring (11) to define an annular space (14), the annular space (14) being configured to accommodate the end of the negative electrode cap (21) of the coin cell (100); and A connecting wall (13) is located at one end of the annular space (14) and connects the inner annular body (11) and the outer annular body (12). The inner ring (11) is configured to be sleeved on the positive electrode (233) of the button cell (100) and to limit the positive electrode (233) radially along the sealing ring (10).

2. The sealing ring (10) according to claim 1, characterized in that, The inner ring (11) is configured to be in clearance fit with the positive electrode (233) of the button cell (100).

3. The sealing ring (10) according to claim 2, characterized in that, The inner ring (11) is configured to have a gap δD between it and the positive electrode (233), satisfying: 0 < δD ≤ 2.2 mm.

4. The sealing ring (10) according to claim 3, characterized in that, The gap δD satisfies: 1mm≤δD≤2mm.

5. The sealing ring (10) according to claim 1, characterized in that, The inner ring (11) has a first inner ring surface (111); the end of the first inner ring surface (111) away from the connecting wall (13) extends obliquely toward the axis of the sealing ring (10).

6. The sealing ring (10) according to claim 5, characterized in that, The included angle between the first inner annular surface (111) and the axis of the sealing ring (10) is α, which satisfies: 1°≤α≤5.5°.

7. The sealing ring (10) according to claim 6, characterized in that, The included angle α satisfies: 2°≤α≤4°.

8. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, Along the axial direction of the sealing ring (10), the outer ring body (12) has a height dimension of H1, and the inner ring body (11) has a height dimension of H2, satisfying: 29% H1≤H2≤66% H1.

9. The sealing ring (10) according to claim 8, characterized in that, The height dimension H2 satisfies: 40% H1 ≤ H2 ≤ 60% H1.

10. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, Along the axial direction of the sealing ring (10), the outer ring body (12) has a height dimension of H1, and the connecting wall (13) has a height dimension of H3, satisfying: 15.3% H1≤H3≤25.6% H1.

11. The sealing ring (10) according to claim 10, characterized in that, The height dimension H3 of the connecting wall (13) satisfies: 18% H1≤H3≤21% H3.

12. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, The outer ring body (12) has a first outer ring surface (121), and the end of the first outer ring surface (121) away from the connecting wall (13) extends obliquely in a direction away from the axis of the sealing ring (10).

13. The sealing ring (10) according to claim 12, characterized in that, The first outer annular surface (121) and the axis of the sealing ring (10) have an included angle β, which satisfies: 0.5°≤β≤3.8°.

14. The sealing ring (10) according to claim 13, characterized in that, The included angle β satisfies: 1.5°≤β≤2.5°.

15. The sealing ring (10) according to claim 12, characterized in that, The outer ring body (12) has a second inner ring surface (122), which is arranged parallel to the first outer ring surface (121).

16. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, Along the axial direction of the sealing ring (10), the outer ring body (12) has a height dimension of H1, and the thickness of the end of the inner ring body (11) away from the connecting wall (13) is D0, satisfying: 5.23% H1≤D0≤8.49%H1; And / or, the inner ring body (11) has a second outer ring surface (112), which is configured to be spaced apart from the end of the negative electrode cover (21).

17. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, The inner ring (11), the outer ring (12), and the connecting wall (13) are integrally formed.

18. The sealing ring (10) according to any one of claims 1 to 7, characterized in that, The inner ring (11) has a second outer ring surface (112), and the end of the second outer ring surface (112) away from the connecting wall (13) extends obliquely toward the axis of the sealing ring (10).

19. The sealing ring (10) according to claim 18, characterized in that, The inner ring body (11) also has a first inner ring surface (111), one end of the first inner ring surface (111) away from the connecting wall (13) extends obliquely toward the axis of the sealing ring (10), and the second outer ring surface (112) is inclined at an angle relative to the axis of the sealing ring (10) greater than the angle of the first inner ring surface (111) relative to the axis of the sealing ring (10).

20. A button cell battery (100), characterized in that, include: Negative electrode cover (21); A positive electrode shell (22) is fitted onto one end of the negative electrode cover (21) to define a receiving cavity (24) with the negative electrode cover (21). According to any one of claims 1 to 19, the sealing ring (10) comprises an outer ring (12) disposed between the negative electrode cover (21) and the positive electrode shell (22), a connecting wall (13) located between the end of the negative electrode cover (21) and the bottom wall of the positive electrode shell (22) to insulate the negative electrode cover (21) from the positive electrode shell (22) and to close the receiving cavity (24), and an inner ring (11) located inside the negative electrode cover (21); and The electrode assembly (23) includes a negative electrode (231), a diaphragm (232) and a positive electrode (233) that are sequentially stacked in the receiving cavity (24) from the negative electrode cover (21) to the positive electrode shell (22). The inner ring (11) surrounds the positive electrode (233).

21. An electrical appliance (1000), characterized in that, Including the button cell (100) as described in claim 20.

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