Sealing structure, battery monomer and electric equipment

Abstract

The embodiment of the utility model provides a sealing structure, a battery monomer and electric equipment, the sealing structure comprises a sealing body, the sealing body is configured to be distributed along a first direction, the sealing body is provided with a buffer part and a mounting part, and the mounting part is conducted with the buffer part; and the ventilation part is connected to the mounting part, so that gas passes through the ventilation part after passing through the buffer part during exhausting. The ventilation part is connected to the mounting part of the sealing body, and the sealing body is also provided with a buffer part, so that when the sealing structure is applied to a battery monomer, ventilation can be performed through the cooperation of the buffer part and the ventilation part, the effectiveness and accuracy of a helium detection mode are improved, and meanwhile, electrolyte climbing can be hindered by combining the action of the buffer part; potential safety hazards caused by liquid leakage due to double superposition of aging of a sealing structure, welding defects of a sealing cover and the like after bagging are completely avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a sealing structure, a battery cell and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In related technologies, in addition to improving the energy density of batteries, the safety of batteries is also an issue that cannot be ignored. Therefore, how to improve the safety of batteries is also a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a sealing structure, a battery cell and an electrical device, which can effectively verify the actual welding defects of the sealing structure through helium inspection, and completely avoid the safety hazard caused by leakage due to the double superposition of aging of the sealing structure and welding defects of the sealing cover after packaging.

[0005] In a first aspect, an embodiment of the present application provides a sealing structure, comprising: a sealing body, which is configured to be distributed along a first direction, and the sealing body is provided with a buffer portion and an installation portion, and the installation portion is connected to the buffer portion; and a breathable member, which is connected to the installation portion so that when exhausting, the gas passes through the breathable member after passing through the buffer portion.

[0006] In the above-mentioned implementation process, the breathable part is connected to the mounting part of the sealing body, and the sealing body is also provided with a buffer part, so that when the sealing structure is applied to the battery cell, ventilation can be achieved through the cooperation of the buffer part and the breathable part, thereby improving the effectiveness and accuracy of the helium detection method. At the same time, combined with the effect of the buffer part, it can hinder the rising of the electrolyte, and completely avoid the safety hazard caused by leakage due to the double superposition of aging of the sealing structure and welding defects of the sealing cover after packaging.

[0007] In some embodiments, the buffer is configured to be distributed along the first direction, and the buffer is configured to be spiral. By configuring the buffer to be spiral, the spiral water flow principle can be used to make the electrolyte move in a spiral motion under forced guidance, increase the friction between the electrolyte and the tube wall, thereby reducing the speed and vortex of the electrolyte and preventing the electrolyte from being drawn out. On the other hand, the spiral motion formed in the pipeline can also improve the mixing of helium and electrolyte, increase the flow rate and efficiency in the pipeline, and release the helium better.

[0008] In some embodiments, the mounting portion includes a first mounting groove and a second mounting groove, the first mounting groove is connected to the second mounting groove, and the second mounting groove is arranged between the first mounting groove and the buffer portion. The cooperation between the first mounting groove and the second mounting groove can not only improve the effectiveness and accuracy of the helium detection method, but also can be used to buffer and store the electrolyte after the electrolyte is drawn out under the action of the second mounting groove.

[0009] In some embodiments, the mounting portion further comprises a third mounting groove, the third mounting groove is arranged at the outer edge of the second mounting groove, and the third mounting groove is communicated with the second mounting groove, so as to be used for buffering and storing the electrolyte after the electrolyte is drawn out.

[0010] In some embodiments, the sealing structure further comprises a sealing member, and the sealing member is sleeved on the sealing body. By connecting the sealing member to the sealing body, when the sealing structure is applied to a battery cell, it can ensure that the sealing structure is closely attached to the injection hole of the battery cell to avoid leakage.

[0011] In some embodiments, the sealing body includes a first portion and a second portion, the first portion is connected to the second portion, and an outer edge dimension of at least a portion of the structure of the second portion is smaller than an outer edge dimension of the first portion.

[0012] In a second aspect, the present application further provides a battery cell, comprising: a battery top cover, which is provided with a first sealing groove; and a sealing structure as described in any one of the above items, wherein the sealing structure is connected to the first sealing groove.

[0013] In the above-mentioned implementation process, the sealing structure is connected to the first sealing groove of the battery top cover, and can seal the first sealing groove. The actual welding defects of the sealing cover of the battery cell can be effectively verified by helium inspection, and the welding process DOE verification of the sealing cover can be quickly carried out, thereby shortening the product development verification cycle, enabling the battery cell to smoothly pass the battery vibration test, the whole package vibration test and the whole vehicle driving durability test, truly improving the reliability of the product, reducing the risk of vibration failure to zero, and completely avoiding the safety hazard caused by leakage due to the double superposition of aging of the sealing structure and welding defects of the sealing cover after the whole package.

[0014] In some embodiments, the battery cell further comprises a sealing cover, which is connected to the battery top cover and is located on one side of the sealing structure. The connection between the sealing cover and the battery top cover can avoid leakage, thereby causing safety hazards.

[0015] In some embodiments, the battery top cover further includes a second sealing groove configured to accommodate the sealing cover.

[0016] In a third aspect, the present application also provides an electrical device, comprising a battery cell as described in any of the above items.

[0017] The electrical equipment provided in the second embodiment of the present application includes the battery cells described in the technical solution of the first aspect, and thus has all the technical effects of the above embodiments, which will not be repeated here.

[0018] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of the sealing structure provided in an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a sealing structure provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0024] Figure 4 An exploded schematic diagram of a battery cell provided in an embodiment of the present application.

[0025] Reference numerals

[0026] 100, sealing body; 101, buffer part; 102, first mounting groove; 103, second mounting groove; 104, third mounting groove; 200, breathable member; 300, sealing member; 400, battery top cover; 500, sealing cover. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0032] Example

[0033] In order to adapt to the continuous improvement of battery cell energy density, the thickness of the battery cell shell in mainstream applications has been reduced from the original 1.0mm to 0.5mm, and is still developing in the direction of thinner (0.35mm, 0.3mm), collectively referred to as thin-walled batteries. In addition to improving the energy density of the battery cell, thin-walled batteries can also bring a simpler layout and better thermal management effect. This is because the tabs of thin-walled batteries are located on the side, which can be compatible with two layers of water cooling systems on the upper and lower sides. Based on the above three factors, thin-walled batteries are the future development trend of the industry and are gradually being selected by mainstream new energy vehicles at home and abroad.

[0034] The three advantages of thin-walled long aluminum shell batteries are:

[0035] ① High platformization and high space utilization: The cell height is 80mm-110mm, which can effectively accommodate the space height requirements of vehicles on different platforms (A / B / C), and is easy to adapt to the different requirements of battery pack layout and vehicle ground clearance indicators. The space volume utilization rate is as high as 80%, making it easier to achieve a higher energy-to-weight ratio;

[0036] ② High production efficiency and low cost: The traditional way of connecting the tabs is that the tabs of the battery cell are pre-welded together by ultrasonic welding. After pre-welding, the tabs of the battery cell are ultrasonically welded to the connecting pieces, and the connecting pieces are then laser welded to the poles of the top cover of the battery cell. This connection method requires two ultrasonic welding processes and one laser welding process. The second ultrasonic welding has high power and high cost. At the same time, an additional connecting piece is required, which not only complicates the process but also increases the production cost. The thin-walled long aluminum shell battery cell adopts the tab-free connecting piece connection technology to improve production efficiency and reduce production costs.

[0037] ③Vertical layout of battery cells, double-sided contact and high thermal management efficiency: The harmonica tube liquid cooling plate can be arranged on both sides of the large surface of the battery cell, or on the top and bottom of the battery cell, which can realize double-sided cooling of the battery cell, increase the contact area of ​​the liquid cooling plate, and enhance the heat exchange capacity of the battery cell. When encountering superimposed working conditions such as high-speed climbing and high-power fast charging, the temperature difference is 3-5°C, which greatly improves the competitiveness of the product.

[0038] Usually, thin-walled long aluminum shell batteries are sealed with glue nails after the first injection, formation activation, high temperature aging, and the second injection. The glue nails are 0.1mm lower than the injection hole plane. The main functions of the glue nails are:

[0039] ① After the formation, gas is generated. After the vacuum is drawn, the rubber nails will be inserted immediately. On the one hand, it is to achieve negative pressure sealing to ensure the safety performance of the battery cell such as expansion and deformation throughout its life cycle; on the other hand, it is to prevent the outside humid air from entering the battery cell and reacting with the electrolyte to affect the performance of the battery cell;

[0040] ②Plug in rubber nails to prevent electrolyte from spilling during transportation;

[0041] ③Plug in rubber nails to prevent foreign objects such as iron filings from entering the battery cell during transportation, causing defects such as short circuits in the battery cell;

[0042] ④ After plugging the glue nails, prevent foreign matter such as welding slag from entering the battery cell during laser cleaning in the next process, causing defects such as short circuits in the battery cell.

[0043] In order to verify the laser welding quality of the sealing nails, defects such as pinholes and cracks cannot be identified by the naked eye. The sealing is mainly tested by helium testing. The specific structure of the nail is a solid nail. Because the nails are injection molded, there are thermal expansion and contraction, and the consistency of the incoming materials will be tight (leakage rate ≤ 9.9*10 -9 Pa·m 3 / s), intermediate state (9.9*10 -7 ≤ Leakage rate ≤9.9*10 -9 Pa·m 3 / s) and loose state (leakage rate ≥9.9*10 -7 Pa·m 3 / s) Three matching scenarios of physical glue nails and injection holes in three situations.

[0044] After the first injection, formation activation, high temperature aging, and second injection, the battery will be sealed with glue nails, which are 0.1mm below the injection hole plane. The existing glue nail structure is solid plastic. When encountering the plugged state and intermediate state described in the above three situations, because the glue nails and the injection hole are in a plugged state, a sufficient amount of helium cannot be effectively overflowed during vacuuming, and defective cells cannot be effectively detected. If the defective cell is passed to the next process, there will be a risk of cell leakage when the glue nails are aged or other abnormalities. If it is installed on a vehicle, it will cause a risk of thermal runaway.

[0045] In view of this, if Figure 1-Figure 4 As shown, in the first aspect, an embodiment of the present application provides a sealing structure, including: a sealing body 100, which is configured to be distributed along a first direction, and the sealing body 100 is provided with a buffer portion 101 and a mounting portion, and the mounting portion is connected to the buffer portion 101; a breathable member 200, which is connected to the mounting portion so that when exhausting, the gas passes through the breathable member 200 after passing through the buffer portion 101.

[0046] Exemplarily, the first direction is the length direction of the sealing structure, and the first direction includes but is not limited to the up and down direction, and its direction is mainly based on the actual installation position of the sealing structure; the sealing structure includes but is not limited to sealing nails, and the technical parameters of the sealing structure are: Shore hardness 90-150 degrees, material EPDM 6395N (80% Vistamaxx 6202+20% PPhj400) or PP+30GF and other materials; working temperature -40℃-250℃; performance of the sealing structure: resistance to electrolyte corrosion; no deformation after baking at 300℃ for 2min; compliance with IP68 standards; flame retardant grade UL94-V0; high temperature durability (85℃, 2000h); high temperature and high humidity durability (85℃, 90%RH, 2000h); hot and cold cycle durability ((-40℃×0.5h-125℃×0.5h)×2700cycle); low temperature durability (-40℃×2000h).

[0047] The breathable component 200 includes but is not limited to a breathable membrane, wherein the structure of the breathable component 200 is composed of an electrolyte-proof breathable membrane + pressure-sensitive paper, etc., and is integrally formed with the main body of the rubber nail or is combined with a separate membrane; it has the functions of being waterproof, breathable, oil-proof, and compliant with the IP68 standard; the technical parameters of the breathable component 200 are as follows: air permeability ≥60L / cm2 / h (@7Kpa); waterproof pressure ≥60Kpa; peeling force ≥0.3N / mm; the performance of the breathable component 200 is as follows: resistant to electrolyte corrosion; under conditions of 85°C and 85 humidity, the adhesion decay rate after aging for 1000H is ≤10%, and there is no deformation after baking at 300°C for 2min; moisture resistance; temperature cycle resistance.

[0048] It should be noted that the sealing structure in the present application can be modular, versatile and flexible, and is suitable for thin-walled long aluminum shell battery cells of different sizes.

[0049] In the above-mentioned implementation process, the breathable member 200 is connected to the mounting portion of the sealing body 100, and the sealing body 100 is also provided with a buffer portion 101, so that when the sealing structure is applied to a battery cell, ventilation can be achieved through the cooperation of the buffer portion 101 and the breathable member 200, thereby improving the effectiveness and accuracy of the helium detection method. At the same time, combined with the effect of the buffer portion 101, the electrolyte can be prevented from rising, thereby completely avoiding the safety hazard caused by leakage due to the double superposition of aging of the sealing structure and welding defects of the sealing cover 500 after packaging.

[0050] In some embodiments, the buffer portion 101 is configured to be distributed along the first direction, and the buffer portion 101 is configured to be spiral; illustratively, the buffer portion 101 includes but is not limited to a buffer hole, and the buffer hole is spiral, wherein the spiral pitch of the buffer hole can be set according to actual conditions, which will not be described in detail here. By configuring the buffer portion 101 to be spiral, the principle of spiral water flow can be used to make the electrolyte undergo spiral motion under forced guidance, increase the friction between the electrolyte and the tube wall, thereby reducing the speed and vortex of the electrolyte and preventing the electrolyte from being drawn out. On the other hand, the formation of a spiral motion in the pipeline can also improve the mixing of helium and electrolyte, increase the flow and efficiency in the pipeline, and release the helium better.

[0051] like Figure 2 As shown, the mounting portion includes a first mounting groove 102 and a second mounting groove 103, the first mounting groove 102 is connected to the second mounting groove 103, and the second mounting groove 103 is arranged between the first mounting groove 102 and the buffer portion 101. Through the cooperation between the first mounting groove 102 and the second mounting groove 103, not only the effectiveness and accuracy of the helium detection method can be improved, but also under the action of the second mounting groove 103, when the electrolyte is drawn out, it can be used to buffer and store the electrolyte.

[0052] like Figure 2 As shown, the mounting portion further includes a third mounting groove 104, which is disposed at the outer edge of the second mounting groove 103 and communicates with the second mounting groove 103, wherein the third mounting groove 104 is recessed in the direction of the second mounting groove 103 close to the buffer portion 101, and the third mounting groove 104 and the buffer portion 101 are both located on the same side of the air permeable member 200. After the electrolyte is drawn out, it can be used to buffer and store the electrolyte.

[0053] like Figure 1-Figure 2 As shown, the sealing structure further includes a sealing member 300, which includes but is not limited to a sealing expansion ring. The sealing member 300 is configured with at least one, wherein in the present application, two sealing members 300 are configured along the first direction, and the two sealing members 300 can be configured in close contact or spaced apart, and the sealing member 300 is sleeved on the sealing body 100. By connecting the sealing member 300 to the sealing body 100, when the sealing structure is applied to a battery cell, it can be ensured that the sealing structure is closely attached to the injection hole of the battery cell to avoid leakage.

[0054] In some embodiments, the sealing body 100 includes a first part and a second part, the first part and the second part are integrally formed, the first part is connected to the second part, and the outer edge size of at least part of the structure of the second part is smaller than the outer edge size of the first part.

[0055] like Figure 3 As shown, in the second aspect, the present application also provides a battery cell, including: a battery top cover 400, which is equipped with a first sealing groove; and a sealing structure as described above, the sealing structure is connected to the first sealing groove, wherein the battery cell includes but is not limited to a thin-walled long aluminum shell battery.

[0056] In the above-mentioned implementation process, the sealing structure is connected to the first sealing groove of the battery top cover 400, and can seal the first sealing groove. The actual welding defects of the sealing cover 500 of the battery cell can be effectively verified by helium inspection, and the welding process DOE verification of the sealing cover 500 can be quickly carried out, thereby shortening the product development verification cycle, enabling the battery cell to smoothly pass the battery vibration test, the whole package vibration test and the whole vehicle driving durability test, truly improving the reliability of the product, reducing the risk of vibration failure to zero, and completely avoiding the double superposition of leakage caused by aging of the sealing structure and welding defects of the sealing cover 500 after the whole package, causing safety hazards.

[0057] like Figure 3 As shown, the battery cell further includes a sealing cover 500, which includes but is not limited to a sealing aluminum nail, and the sealing cover 500 is connected to the battery top cover 400, and the sealing cover 500 is located on one side of the sealing structure. The connection between the sealing cover 500 and the battery top cover 400 can avoid leakage, thereby causing safety hazards.

[0058] In some embodiments, the battery top cover 400 further includes a second sealing groove, and the second sealing groove is configured to accommodate the sealing cover 500 , and both of them can be welded.

[0059] In a third aspect, the present application also provides an electrical device, comprising the battery cell as described above.

[0060] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0061] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0062] The interior of the vehicle is provided with a battery, which can be arranged at the bottom, head or tail of the vehicle. The battery can be used for power supply of the vehicle, for example, the battery can be used as an operating power source of the vehicle.

[0063] The vehicle may further include a controller and a motor, wherein the controller is used to control the battery to supply power to the motor, for example, to meet the power requirements for starting, navigating, and driving the vehicle.

[0064] In a battery, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by multiple battery cells is accommodated in a box; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in a box. Battery cells can be cylindrical, flat, rectangular, or in other shapes.

[0065] Each battery cell may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell may be cylindrical, flat, rectangular, or in other shapes.

[0066] In some embodiments, the battery may further include a busbar component, and multiple battery cells may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells.

[0067] In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0068] The electrical equipment provided in the second embodiment of the present application includes the battery cells described in the technical solution of the first aspect, and thus has all the technical effects of the above embodiments, which will not be repeated here.

[0069] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0070] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0071] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A sealing structure, characterized in that: include: A sealing body, which is arranged to be distributed along a first direction, and the sealing body is provided with a buffer portion and a mounting portion, and the mounting portion is in conduction with the buffer portion; A breathable member is connected to the mounting portion so that when exhausting, the gas passes through the buffer portion and then through the breathable member.

2. The sealing structure according to claim 1, characterized in that: The buffer portion is configured to be distributed along the first direction, and the buffer portion is configured in a spiral shape.

3. The sealing structure according to claim 1, characterized in that: The mounting portion includes a first mounting groove and a second mounting groove, the first mounting groove is connected to the second mounting groove, and the second mounting groove is arranged between the first mounting groove and the buffer portion.

4. The sealing structure according to claim 3, characterized in that: The mounting portion further includes a third mounting groove, the third mounting groove is disposed at an outer edge of the second mounting groove, and the third mounting groove is communicated with the second mounting groove.

5. The sealing structure according to claim 1, characterized in that: The sealing structure further comprises a sealing member, and the sealing member is sleeved on the sealing body.

6. The sealing structure according to claim 1, characterized in that: The sealing body includes a first part and a second part, the first part is connected to the second part, and the outer edge size of at least a part of the structure of the second part is smaller than the outer edge size of the first part.

7. A battery cell, characterized in that: include: A battery top cover, which is provided with a first sealing groove; and The sealing structure according to any one of claims 1 to 6, wherein the sealing structure is connected to the first sealing groove.

8. The battery cell according to claim 7, characterized in that: The battery cell further includes a sealing cover, which is connected to the battery top cover and is located at one side of the sealing structure.

9. The battery cell according to claim 8, characterized in that: The battery top cover further includes a second sealing groove configured to accommodate the sealing cover.

10. An electrical device, characterized in that: Comprising a battery cell as described in any one of claims 7 to 9.

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