Sealing device, energy storage device and electric equipment

Abstract

The application discloses a sealing device, an energy storage device and an electric equipment, and relates to the technical field of energy storage. The sealing device comprises a sealing part and a guiding part; the sealing part is connected with the guiding part; the sealing part is provided with a first through hole penetrating the guiding part; the guiding part is provided with a second through hole penetrating and communicating with the first through hole; the second through hole comprises a first aperture away from the first through hole; the first aperture forms a slit; and the slit is used for limiting the circulation of liquid. In the application, the sealing device is used for sealing a liquid injection hole; the sealing of the liquid injection hole by the sealing part can avoid the leakage of electrolyte; the slit formed by the first aperture of the second through hole on the guiding part can limit the circulation of electrolyte, while ensuring that helium molecules escape to the second through hole; and then the flow channel formed by the communicated first through hole and second through hole forms an escape channel of helium molecules, so as to ensure the effectiveness of helium detection of the energy storage device with the sealing device.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more specifically, to a sealing device, an energy storage device, and an electrical device. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after being discharged to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, people are also placing higher demands on their performance in various aspects, especially on their safety.

[0003] In related technologies, the electrolyte injection hole on the cover plate of the battery is typically sealed by welding after a sealing element is inserted. Since the sealing element is usually interference-fitted within the injection hole, it easily achieves an effective seal due to the interference fit, preventing helium molecule leakage. However, the helium detection structure of the battery cannot guarantee the welding reliability of the sealing element, thus increasing the risk of unreliable sealing in the secondary battery. Summary of the Invention

[0004] A primary objective of this application is to provide a sealing device, energy storage device, and electrical equipment that can improve the reliability of helium detection.

[0005] To achieve the above-mentioned objectives, this application adopts the following technical solution:

[0006] According to one aspect of this application, a sealing device is provided for sealing an energy storage device by being disposed within an injection hole on a cover plate. The sealing device includes a sealing portion and a guide portion; the sealing portion is connected to the guide portion, the sealing portion having a first through hole extending into the guide portion, and the guide portion having a second through hole extending through and communicating with the first through hole; the second through hole includes a first orifice remote from the first through hole, the first orifice forming a slit, the slit being used to restrict the flow of liquid into the second through hole.

[0007] In this embodiment, the sealing device is used to seal the injection hole. When sealing the injection hole, the assembly efficiency can be improved by the guidance of the guide part. After the sealing device is installed in the injection hole, the leakage of electrolyte can be avoided by sealing the injection hole with the sealing part. The flow of electrolyte can be restricted by the slit formed by the first orifice of the second through hole on the guide part, while ensuring that helium molecules escape to the second through hole. Then, the flow channel formed by the connected first through hole and the second through hole forms an escape channel for helium molecules, so as to ensure the effectiveness of helium detection of the energy storage device with the sealing device.

[0008] According to any of the sealing devices described in this disclosure, the slit is a straight slit, and the guide portion has a first abutting area and a second abutting area distributed on both sides of the slit, the first abutting area and the second abutting area being used to abut against the wall of the injection hole.

[0009] In this embodiment, after the guide portion of the sealing device extends into the injection hole, the guide portion can be compressed and deformed towards the area near the slit due to the contact between the first contact area and the second contact area of ​​the guide portion and the wall of the injection hole. This further reduces the size of the slit on the guide portion, effectively preventing the flow of electrolyte while ensuring the flow of helium molecules.

[0010] According to any of the sealing devices described in this disclosure, the first abutting area and the second abutting area are symmetrically distributed on both sides of the slit.

[0011] According to any of the sealing devices described in this disclosure, the guide portion is a rhomboid prism structure, and the major axis of the rhombus is perpendicular to the length direction of the slit.

[0012] In this embodiment of the application, by setting the first contact area and the second contact area, it can be ensured that the two sides of the slit deform symmetrically when the slit is squeezed and deformed, which further ensures the uniformity of the slit deformation and avoids the situation that the gap is large in a local area of ​​the slit due to uneven deformation.

[0013] According to any of the sealing devices described in this disclosure, the guide portion is a plate-shaped structure, and both corners of the guide portion away from the sealing portion are chamfered.

[0014] According to any of the sealing devices described in this disclosure, the guide portion has a prismatic structure, and multiple corners of the guide portion away from the sealing portion are provided with chamfers.

[0015] According to any of the sealing devices described in this disclosure, the guide portion has a cylindrical structure, and the end of the guide portion away from the sealing portion is frustum-shaped.

[0016] In this embodiment, the material used in the guide part can be reduced and the cost lowered while ensuring the effectiveness of helium detection by adjusting the structural shape of the guide part; alternatively, the contact area between the guide part and the wall of the injection hole can be increased by adjusting the structural shape of the guide part, thereby improving the stability of the guide part and the cover plate and increasing the deformable area of ​​the guide part.

[0017] According to any of the sealing devices described in this disclosure, both the sealing portion and the guiding portion comprise resin and rubber, and the sulfur content of the sealing portion is less than the sulfur content of the guiding portion.

[0018] In this embodiment, the sulfur content of the sealing part is set to be less than that of the guide part, so that the elasticity of the guide part is greater than that of the sealing part, thereby ensuring the effective sealing of the injection hole by the sealing part, while ensuring that the guide part has a certain amount of compression deformation, which helps to form a slit.

[0019] According to any of the sealing devices described in this disclosure, the sealing portion has external threads, or both the sealing portion and the guide portion have external threads.

[0020] In this embodiment, the external thread allows for screwing into the injection hole, thereby improving the stability of the sealing device within the injection hole and preventing the sealing device from falling off.

[0021] According to any of the sealing devices described in this disclosure, the end face of the sealing portion away from the guide portion has a groove for receiving an external tool to cause the sealing device to rotate.

[0022] According to one aspect of this application, an energy storage device is provided, comprising:

[0023] The housing includes a receiving cavity with an opening; an electrode assembly housed within the receiving cavity; and an end cap assembly including a cover plate, a sealing pin, and a sealing device as described in one aspect above, the cover plate sealing the opening of the receiving cavity and having an injection hole, the sealing device sealing within the injection hole, the sealing pin being welded within the injection hole, and the sealing device being located on a side close to the electrode assembly.

[0024] In this embodiment of the application, in conjunction with the above description, the reliability of the sealing nail welding can be effectively determined by helium testing of the energy storage device, provided that the sealing device does not prevent helium molecules from escaping. This avoids cracking of the welded parts due to thermal expansion and contraction during use, thereby improving the safety of the energy storage device.

[0025] According to any of the energy storage devices described in this disclosure, the wall of the injection hole has an internal thread, the sealing device is screwed into the injection hole, and the thread pitch diameter of the external thread on the sealing device is greater than the thread pitch diameter of the internal thread on the injection hole.

[0026] In this embodiment, the screw connection of the sealing device in the injection hole can increase the stability of the sealing device. It can also play a certain guiding role when injecting electrolyte, so that the electrolyte remaining on the cover plate can flow into the receiving cavity of the shell along the internal thread.

[0027] According to one aspect of this application, an electrical device is provided, the electrical device including the energy storage device described in the above aspect, the energy storage device supplying power to the electrical device.

[0028] In this embodiment of the application, in conjunction with the above description, the stability of the electrical equipment is ensured based on the safety of the energy storage device.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The above and other features and advantages of this application will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of a residential energy storage system according to an exemplary embodiment.

[0032] Figure 2 This is a cross-sectional structural schematic diagram of an energy storage device according to an exemplary embodiment.

[0033] Figure 3 This is a partially enlarged structural schematic diagram of an end cap assembly according to an exemplary embodiment.

[0034] Figure 4 This is a schematic diagram of the axial top view of a sealing device according to an exemplary embodiment.

[0035] Figure 5 This is a schematic diagram of the axial side bottom view of a sealing device according to an exemplary embodiment.

[0036] Figure 6 This is a schematic diagram of the axial top view of another sealing device according to an exemplary embodiment.

[0037] Figure 7 This is a schematic diagram of the axial side bottom structure of another sealing device according to an exemplary embodiment.

[0038] Figure 8 This is a schematic diagram of the axial side bottom structure of another sealing device according to an exemplary embodiment.

[0039] Figure 9 This is a schematic diagram of the axial side bottom structure of another sealing device according to an exemplary embodiment.

[0040] Figure 10 yes Figure 9 The diagram shows a bottom view of the sealing device.

[0041] Figure 11 yes Figure 4 The diagram shows a cross-sectional view of the sealing device.

[0042] Figure 12 yes Figure 6 The diagram shows a cross-sectional view of the sealing device.

[0043] Figure 13 This is a cross-sectional structural schematic diagram of another sealing device according to an exemplary embodiment.

[0044] Figure 14 yes Figure 13 A partially enlarged schematic diagram of the sealing device shown.

[0045] Figure 15 This is a cross-sectional structural schematic diagram of another sealing device according to an exemplary embodiment.

[0046] Figure 16 yes Figure 15 A partially enlarged schematic diagram of the sealing device shown.

[0047] Figure 17 This is a schematic diagram of the structure of an electrical device according to an exemplary embodiment.

[0048] The reference numerals in the attached figures are explained as follows:

[0049] 100. Energy storage devices; 200. Power conversion devices; 300. User loads; 400. Electrical equipment;

[0050] 10. Housing; 20. Electrode assembly; 30. End cap assembly;

[0051] 11. Receiving cavity;

[0052] 31. Cover plate; 32. Seal; 33. Sealing device; 34. Sealing pin;

[0053] 311. Injection hole;

[0054] 331. Sealing part; 332. Guide part;

[0055] 3311, First through hole;

[0056] 3320, Protrusion; 3321, Second through hole; 3322, Slit; 3323, First abutment area; 3324, Second abutment area; 3325, Breathable membrane; 3326, Groove; 3327, Slot; 3328, First opening; 3329, Second opening. Detailed Implementation

[0057] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0058] Because the energy people need is highly time- and space-dependent, in order to make rational use of energy and improve energy efficiency, it is necessary to use a medium or device to store one form of energy in the same way or by converting it into another form of energy, and then release it in a specific form of energy based on future applications.

[0059] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of energy storage devices include:

[0060] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak regulation and frequency regulation.

[0061] (2) Small and medium-sized energy storage cabinets used in commercial and industrial energy storage scenarios (banks, shopping malls, etc.) and small household energy storage boxes used in residential energy storage scenarios primarily operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity consumption between peak and off-peak periods, users with energy storage devices typically charge them during off-peak hours to reduce costs; during peak hours, they release the stored electricity for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the presence of household energy storage devices effectively provides backup power for users and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0062] This explanation will take the residential energy storage scenario in user-side energy storage as an example. Figure 1 A residential energy storage system is shown, which includes an energy storage device 100 and an energy conversion device 200 (such as a photovoltaic panel), as well as user loads 300 (such as streetlights, household appliances, etc.). The energy storage device 100 is a small energy storage box that can be wall-mounted on an outdoor wall.

[0063] The energy storage device 100 is electrically connected to the power conversion device 200 and the user load 300. The power conversion device 200 can convert solar energy into electrical energy during periods of low electricity prices and store it through the energy storage device 100. Then, during periods of high electricity prices, the energy storage device 100 can supply the user load 300 with electricity, or when the power grid is interrupted / out of service, the energy storage device 100 can supply the user load 300 with electricity.

[0064] In conjunction with the aforementioned energy storage methods using physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 includes at least one chemical battery. The chemical elements within the battery serve as the energy storage medium, and the charging and discharging process is achieved through the chemical reactions or changes in the storage medium. Simply put, electrical energy generated from solar or wind power is stored in at least one set of chemical batteries through the chemical reactions or changes in the storage medium. When external power consumption reaches its peak, the stored energy from at least one set of chemical batteries is released for use or transferred to areas with power shortages through the chemical reactions or changes in the storage medium.

[0065] This application provides an energy storage device, which may be, but is not limited to, a single battery (secondary battery), as well as a battery module, battery pack, battery system, etc., composed of single batteries. The single battery may be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the single battery may be cylindrical, flat, cuboid, etc., and this application does not limit the form.

[0066] Next, we will take cylindrical single-cell batteries as an example to explain energy storage devices in detail.

[0067] Figure 2 A schematic diagram illustrating the structure of an energy storage device provided in an embodiment of this application is shown. Figure 2 As shown, the energy storage device 100 includes: a housing 10, an electrode assembly 20, and an end cap assembly 30. The housing 10 includes a receiving cavity 11 with an opening. The electrode assembly 20 is housed in the receiving cavity 11, and the end cap assembly 30 seals the opening of the receiving cavity 11.

[0068] The housing 10 can be a cylindrical structure with one end open. In this case, the energy storage device 100 includes an end cap assembly 30 to seal the opening at one end of the housing 10. Alternatively, the housing 10 can be a cylindrical structure with both ends open. In this case, the energy storage device 100 includes an end cap assembly 30 and an end plate, or two end cap assemblies 30. Thus, the openings at both ends of the housing 10 can be sealed by one end cap assembly 30 and an end plate, or by two end cap assemblies 30.

[0069] Among them, such as Figure 3As shown, the end cap assembly 30 includes a cover plate 31 with an injection hole 311 and a sealing member 32 for sealing the injection hole 311, so that after the basic assembly of the energy storage device 100 is completed, electrolyte can be injected into the receiving cavity 11 of the housing 10 along the injection hole 311, and after the injection of electrolyte is completed, the injection hole 311 is sealed by the sealing member 32.

[0070] In addition, the end cap assembly 30 also includes an electrode terminal, which passes through the cover plate 31, with one end connected to the electrode assembly 20 and the other end exposed outside the cover plate 31, serving as an output terminal of the energy storage device 100. An explosion-proof valve may also be provided on the cover plate 31 to discharge gas accumulated in the receiving cavity 11 of the housing 10, thereby improving the safety of the energy storage device 100.

[0071] The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator stacked together, with the separator located between the positive and negative electrode. Both the positive and negative electrode ends have tabs to form the positive and negative tabs of the energy storage device 100. The positive and negative tabs can be located at the same end of the electrode assembly 20 or at different ends. For example, if the positive and negative tabs are located at different ends, one of the positive and negative tabs is connected to the electrode terminals included in the end cap assembly 30, and the other is connected to the bottom of the housing 10, so that the electrical energy output of the electrode assembly 20 is achieved through the electrode terminals of the end cap assembly 30 and the bottom of the housing 10.

[0072] It should be noted that the energy storage device 100 also includes a metal adapter to connect one tab of the electrode assembly 20 to one electrode terminal of the end cap assembly 30, and to connect the other tab of the electrode assembly 20 to the bottom of the housing 10, thereby ensuring the current-carrying area of ​​the electrode assembly 20 when outputting electrical energy and extending the service life of the energy storage device 100.

[0073] To improve the safety of the energy storage device 100, a sealing test is performed before the energy storage device 100 leaves the factory. Since helium molecules are very small, even tiny gaps can cause leakage. Therefore, helium is injected into the receiving cavity 11 of the housing 10 before the injection hole 311 on the sealing cover 31. After the injection hole 311 is sealed, the sealing effect of the injection hole 311 is determined by detecting whether there is any leakage of helium molecules.

[0074] In related technologies, the sealing of the injection hole 311 is typically achieved by inserting a sealing element 32 into the injection hole 311 and then welding the sealing element 32 to the cover plate 31. Since the sealing element 32 is usually press-fitted into the injection hole 311, it easily achieves an effective seal, preventing helium molecule leakage. However, the detection results of helium molecules cannot effectively determine the reliability of the welding between the sealing element 32 and the cover plate 31, increasing the risk of unreliable welding.

[0075] This application provides a sealing element 32, such as... Figure 3 As shown, the seal 32 includes a sealing device 33 and a sealing pin 34. The sealing device 33 is used to seal within the injection hole 311, and the sealing pin 34 is used to weld within the injection hole 311. In conjunction with the above description, for the end cap assembly 30 included in the energy storage device 100 of this application, as... Figure 2 and Figure 3 As shown, the end cap assembly 30 includes a cover plate 31, a sealing pin 34, and a sealing device 33. The cover plate 31 seals the opening of the receiving cavity 11 on the housing 10 and has an injection hole 311. The sealing device 33 is sealed in the injection hole 311, and the sealing pin 34 is welded in the injection hole 311. The sealing device 33 is located on the side close to the electrode assembly 20.

[0076] The sealing device 33, by sealing the injection hole 311, prevents the electrolyte from spraying out while ensuring the escape of helium molecules. Thus, after the sealing pin 34 is welded to the cover plate 31, the reliability of the sealing pin 34 weld can be effectively determined by helium testing of the energy storage device 100, without the sealing device 33 preventing the escape of helium molecules. This avoids cracking of the weld due to thermal expansion and contraction during use, improving the safety of the energy storage device 100. Furthermore, the sealing device 33 prevents debris from entering the receiving cavity 11 of the housing 10 during the welding of the sealing pin 34, further ensuring the safety of the energy storage device 100.

[0077] The sealing device 33 can be an interference fit within the injection hole 311, meaning the sealing device 33 is interference-fitted with the wall of the injection hole 311 to ensure a seal. Alternatively, the wall of the injection hole 311 can have internal threads, and the sealing device 33 can have external threads, with the sealing device 33 screwed into the injection hole 311 to ensure a seal. Another option is that the wall of the injection hole 311 has internal threads, and the sealing device 33 has external threads, with the thread pitch diameter of the external threads on the sealing device 33 being larger than the thread pitch diameter of the internal threads on the injection hole 311. The sealing device 33 is screwed into the injection hole 311 and interference-fitted with the wall of the injection hole 311, thus effectively ensuring a seal.

[0078] It should be noted that when the wall of the injection hole 311 has internal threads, the internal threads can play a certain guiding role when electrolyte is injected along the injection hole 311, so that the electrolyte remaining on the cover plate 31 can flow into the housing cavity 11 along the internal threads.

[0079] In the embodiments of this application, such as Figure 4 and Figure 5 As shown, the sealing device 33 includes a sealing part 331 and a guide part 332; the sealing part 331 is connected to the guide part 332, the sealing part 331 has a first through hole 3311 extending through to the guide part 332, and the guide part 332 has a second through hole 3321 extending through and communicating with the first through hole 3311; the second through hole 3321 includes a first opening 3228 away from the first through hole 3311, and the first opening 3228 forms a slit 3322, the slit 3322 being used to restrict the flow of liquid to the second through hole 3321.

[0080] Thus, when the sealing device 33 is inserted into the injection hole 311, the assembly efficiency can be improved by the guidance of the guide part 332. After the sealing device 33 is inserted into the injection hole 311, the sealing part 331 can seal the injection hole 311 to prevent electrolyte leakage. In addition, the slit 3322 formed by the first opening of the second through hole 3321 on the guide part 332 can restrict the electrolyte flow to the second through hole 3321, while ensuring that helium molecules escape to the second through hole 3321. Then, the flow channel formed by the connected first through hole 3311 and second through hole 3321 forms an escape channel for helium molecules, thereby ensuring the effectiveness of the helium detection of the energy storage device 100 with the sealing device 33.

[0081] The slit 3322 formed by the second through hole 3321 can be as follows: Figure 5 The slit shown can also be a straight slit or a cross slit, as long as it can effectively restrict the flow of liquid into the second through hole 3321. This application does not limit this aspect in its implementation.

[0082] In this embodiment of the application, the sealing device 33 includes a sealing portion 331 and a guiding portion 332, both of which are made of rubber to ensure that the sealing portion 331 and the guiding portion 332 have certain elastic deformation properties. For example, the sealing portion 331 and the guiding portion 332 can both be elastic structures made of a mixture of rubber and resin. Specifically, the sealing portion 331 and the guiding portion 332 can both be thermoplastic vulcanized rubber, etc.

[0083] The sealing part 331 and the guide part 332 can be injection molded separately and then fixed by bonding or other means to obtain the sealing device 33; of course, the sealing part 331 and the guide part 332 can also be injection molded as a whole. For example, the guide part 332 can be injection molded first, and then the sealing part 331 can be injection molded at one end of the guide part 332 to obtain the sealing device 33 with an integral structure.

[0084] In this embodiment, the first through hole 3311 on the sealing part 331 can be a cylindrical hole, a prismatic hole, etc. The sealing part 331 seals the injection hole 311 by interference fitting the sealing part 331 into the injection hole 311, i.e., the sealing part 331 is interference-fitted with the hole wall of the injection hole 311 to ensure effective sealing of the injection hole 311 by the sealing part 331; alternatively, the hole wall of the injection hole 311 may have internal threads, and the sealing part 331 may have external threads. 31 is screwed into the injection hole 311 to ensure effective sealing of the injection hole 311 by the sealing part 331; alternatively, the wall of the injection hole 311 has internal threads, the sealing part 331 has external threads, and the thread pitch diameter of the external thread on the sealing part 331 is larger than the thread pitch diameter of the internal thread on the injection hole 311. The sealing part 331 is screwed into the injection hole 311 and has an interference fit with the wall of the injection hole 311, thereby ensuring effective sealing of the injection hole 311 by the sealing part 331.

[0085] When the sealing part 331 has external threads, it can be as follows: Figure 6 As shown, the end face of the sealing part 331 away from the guide part 332 has a groove 3327. The groove 3327 is used to accommodate an external tool to cause the sealing device 33 to rotate. In this way, an external tool can be inserted into the groove 3327, and the external tool can drive the sealing device 33 to rotate, thereby realizing the screw connection between the sealing part 331 and the injection hole 311.

[0086] The groove 3327 on the end face of the sealing part 331 can be a straight groove or a cross groove, etc. Due to the first through hole 3311 on the sealing part 331, assuming the first through hole 3311 is a round hole, taking a straight groove as an example... Figure 6As shown, the slot 3327 can be a strip-shaped groove distributed on both sides of the first through hole 3311 in the diameter direction of the opening of the first through hole 3311. Of course, in order to avoid the influence of the first through hole 3311, the slot 3327 on the end face of the sealing part 331 can also be a plurality of circular grooves evenly distributed around the first through hole 3311, that is, the plurality of circular grooves on the end face of the sealing part 331 constitute the slot 3327.

[0087] In this embodiment, the end of the guide portion 332 away from the sealing portion 331 is a frustum or prismatic structure, so that the guide portion 332 can smoothly guide the sealing portion 331 into the injection hole 311.

[0088] Optionally, such as Figure 7 As shown, the guide portion 332 has a cylindrical structure, and the end of the guide portion 332 away from the sealing portion 331 is frustoconical; or, as Figure 8 As shown, the guide portion 332 has a plate-like structure, and both corners of the guide portion 332 away from the sealing portion 331 are chamfered; or, as Figure 6 or Figure 9 As shown, the guide portion 332 has a prismatic structure, and multiple corners of the guide portion 332 away from the sealing portion 331 are provided with chamfers.

[0089] Taking the guide section 332 as an example, which has a plate-like structure, such as Figure 8 As shown, the slit 3322 formed by the first through hole 3311 can be a straight slit, and the length of the slit 3322 is parallel to one side surface of the guide portion 332.

[0090] In this way, by adjusting the structural shape of the guide part 332, the material used in the guide part 332 can be reduced while ensuring the effectiveness of helium detection, thus reducing costs. Alternatively, by adjusting the structural shape of the guide part 332, the contact area between the guide part 332 and the wall of the injection hole 311 can be increased, thereby improving the stability of the guide part 332 and the cover plate 31, and increasing the deformable area of ​​the guide part 332.

[0091] Furthermore, after the guide portion 332 is inserted into the injection hole 311, the guide portion 332 can be exposed outside the opening of the injection hole 311 or it can be inside the injection hole 311. When the guide portion 332 is inside the injection hole 311, the guide portion 332 and the inner wall of the injection hole 311 can be an interference fit or a screw connection to improve the stability of the sealing device 33 in the injection hole 311 and prevent the sealing device 33 from falling into the receiving cavity 11 of the housing 10 along the injection hole 311. For example, as... Figure 6 , Figure 7 or Figure 8As shown, both the sealing part 331 and the guide part 332 have external threads to improve the stability of the sealing device 33 and the cover plate 31 by screwing them into the injection hole 311.

[0092] In some implementations, such as Figure 9 and Figure 10 The slit 3322 is a straight slit 3322. The guide portion 332 has a first abutment area 3323 and a second abutment area 3324 distributed on both sides of the slit 3322. Both the first abutment area 3323 and the second abutment area 3324 are used to abut against the wall of the injection hole 311. In this way, after the guide portion 332 of the sealing device 33 extends into the injection hole 311, the abutment of the first abutment area 3323 and the second abutment area 3324 of the guide portion 332 against the wall of the injection hole 311 causes the guide portion 332 to be compressed and deformed towards the area close to the slit 3322, thereby further reducing the size of the slit 3322 on the guide portion 332, so as to effectively prevent the flow of electrolyte while ensuring the flow of helium molecules.

[0093] Optionally, the first abutting area 3323 and the second abutting area 3324 on the guide portion 332 are symmetrically distributed on both sides of the slit 3322 to ensure that the guide portion 332 forms relative extrusion force on both sides of the slit 3322, and the direction of the extrusion force is perpendicular to the length direction of the slit 3322, thereby ensuring that the slit 3322 undergoes uniform deformation and avoiding the situation where the gap is large in a local area of ​​the slit 3322 due to uneven deformation.

[0094] Optionally, the line connecting the center point of the first contact area 3323 and the center point of the second contact area 3324 is located on the vertical plane of the slit 3322. In this way, it can be ensured that when the slit 3322 undergoes extrusion deformation, the slit 3322 deforms symmetrically on both sides of the midpoint, further ensuring the uniformity of the deformation of the slit 3322.

[0095] For example, such as Figure 10 As shown, the guide portion 332 has a rhomboid prism structure, and the major axis O of the rhombus is perpendicular to the length direction of the slit 3322. At this time, the two corners of the guide portion 332 along the major axis of the rhombus form the first abutment area 3323 and the second abutment area 3324 of the guide portion 332. So that after the sealing device 33 is inserted into the injection hole 311, the first abutment area 3323 and the second abutment area 3324 on the guide portion 332 can deform towards the slit 3322 under the pressure of the wall of the injection hole 311. The deformation of the slit 3322 at any position in the length direction is symmetrical along the major axis of the rhombus to ensure the uniformity of the deformation of the slit 3322.

[0096] In some implementations, such as Figure 11As shown, the second through hole 3321 on the guide portion 332 can be a tapered hole. Specifically, the shape of the second opening 3329 of the second through hole 3321 near the first through hole 3311 is the same as the opening shape of the first through hole 3311. For example, the second through hole 3321 has a tapered hole where the second opening 3229 is circular and the first opening 3328 is a slit 3322.

[0097] Of course, such as Figure 12 As shown, the second through hole 3321 can also be a slit hole, that is, the entire channel of the second through hole 3321 on the guide part 332 forms a slit 3322 to effectively restrict the flow of liquid into the second through hole 3321, thereby ensuring the effectiveness of helium detection for the energy storage device 100 with the sealing device 33, and further preventing the electrolyte inside the shell 10 from spraying out.

[0098] For the second through hole 3321 on the guide portion 332, the slit 3322 can be formed during the manufacturing process. That is, the guide portion 332 with the second through hole 3321 and the slit 3322 formed in the second through hole 3321 can be directly manufactured. For example, when the guide portion 332 is formed by injection molding, the slit 3322 can be formed by a thin partition, or after the guide portion 332 is manufactured, the slit 3322 can be obtained by cutting with a blade. Of course, the slit 3322 can also be formed by combining the manufacturing process with the compression deformation of the guide portion 332. For example, when the guide portion 332 is formed by injection molding, a certain gap is first formed by a thin partition. Then, after the injection hole 311 is inserted into the guide portion 332, the pressure between the hole wall of the injection hole 311 and the outer wall of the guide portion 332 causes the guide portion 332 to undergo compression deformation, and the gap formed by compression is called the slit 3322.

[0099] In the aforementioned method of forming the slit 3322, the elasticity of the sealing part 331 and the guiding part 332 can be the same, or the elasticity of the sealing part 331 can be less than that of the guiding part 332, meaning the sulfur content of the sealing part 331 is less than that of the guiding part 332. When the elasticity of the guiding part 332 is greater than that of the sealing part 331, it ensures effective sealing of the injection hole 311 by the sealing part 331, while also ensuring that the guiding part 332 has a certain amount of compressive deformation, thus further facilitating the formation of the slit 3322.

[0100] In addition, when the guide part 332 has a large elasticity, after the sealing device 33 seals the injection hole, the injection needle can be used to pass through the first through hole 3311 on the sealing part 331 and the second through hole 3321 on the guide part 332 in sequence, so as to extend out after deforming the slit 3322 formed by the first orifice 3328; and after the injection is completed and the injection needle is removed, the first orifice 3328 on the guide part 332 can be restored to a slit structure under its own elasticity to avoid electrolyte leakage, thereby achieving the effect of preventing electrolyte backflow.

[0101] In some implementations, such as Figure 13 As shown, the sealing device 33 also includes a breathable membrane 3325, which is fixed between the sealing part 331 and the guide part 332 and covers the second opening 3329 of the second through hole 3321. Thus, based on the characteristics of the breathable membrane 3325, it further prevents the electrolyte inside the housing 10 from flowing into the second through hole 3321 and then spraying outwards along the first through hole 3311, while ensuring the permeability of helium molecules, thereby ensuring the reliability of helium detection.

[0102] In the sealing device 33 including the breathable membrane 3325, the guide portion 332 can be injection molded first, then the breathable membrane 3325 can be placed on the end face of the guide portion 332 and cover the second opening 3329 of the second through hole 3321, and then the sealing portion 331 can be injection molded to fix the breathable membrane 3325 between the guide portion 332 and the sealing portion 331. Alternatively, the guide portion 332 and the sealing portion 331 can be injection molded separately, and then the breathable membrane 3325 can be clamped between the guide portion 332 and the sealing portion 331. Then, the guide portion 332 and the sealing portion 331 can be fixed by means of bonding, etc., to achieve the fixation of the breathable membrane 3325 between the guide portion 332 and the sealing portion 331.

[0103] For fixing the breathable membrane 3325 between the guide portion 332 and the sealing portion 331, the opposite end faces of the guide portion 332 and the sealing portion 331 can be flat, and the breathable membrane 3325 can be directly clamped between the guide portion 332 and the fixing portion; or the end face of the first of the sealing portion 331 and the guide portion 332 facing the second can have a groove 3326, and the breathable membrane 3325 can be located in the groove 3326; or the end face of the first of the sealing portion 331 and the guide portion 332 facing the second can have a groove 3326, and the end face of the second of the guide portion facing the first can have a protrusion, and the breathable membrane 3325 can be located in the groove 3326, and the protrusion can be stuck in the groove 3326.

[0104] In the case where the first of the sealing part 331 and the guide part 332 is provided with a groove 3326, or where the first of the sealing part 331 and the guide part 332 is provided with a groove 3326 and the second is provided with a protrusion, the contact area between the guide part 332 and the sealing part 331 can be increased, thereby facilitating the improvement of the stability of the guide part 332 and the sealing part 331.

[0105] For example, such as Figure 13 and Figure 14 As shown, the end face of the sealing part 331 facing the guide part 332 has a groove 3326, and the breathable membrane 3325 is located in the groove 3326. The end face of the guide part 332 facing the sealing part 331 is pressed onto the breathable membrane 3325; or, as Figure 15 and Figure 16 As shown, the end face of the sealing part 331 facing the guide part 332 has a groove 3326, and the breathable membrane 3325 is located in the groove 3326. The end face of the guide part 332 facing the sealing part 331 has a protrusion 3320, and the end face of the protrusion 3320 is located in the groove 3326 and is pressed onto the breathable membrane 3325. The protrusion 3320 may be an annular structure and is arranged around the second opening 3329 of the second through hole 3321.

[0106] This application also provides an electrical device 400, such as... Figure 17 As shown, the electrical device 400 includes the energy storage device 100 described in the above embodiments, and the energy storage device 100 supplies power to the electrical device 400. Thus, in conjunction with the above description, the electrical device 400 of this application can ensure the stability of the electrical device 400 during use based on the safety of the energy storage device 100.

[0107] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0108] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0109] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the implementation of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] The above are merely preferred embodiments of the implementation methods of this application and are not intended to limit the implementation methods of this application. For those skilled in the art, various modifications and variations can be made to the implementation methods of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the implementation methods of this application should be included within the protection scope of the implementation methods of this application.

Claims

1. A sealing device, characterized in that, The sealing device (33) includes: a sealing part (331) and a guide part (332). The sealing part (331) is connected to the guide part (332). The sealing part (331) has a first through hole (3311) extending through the guide part (332), and the guide part (332) has a second through hole (3321) extending through and communicating with the first through hole (3311). The second through hole (3321) includes a first opening (3328) away from the first through hole (3311), the first opening (3328) forming a slit (3322), the slit (3322) being used to restrict the flow of liquid while ensuring that helium molecules escape along the first opening (3328) to the second through hole (3321). The guide portion (332) has a first abutting area (3323) and a second abutting area (3324) distributed on both sides of the slit (3322), and both the first abutting area (3323) and the second abutting area (3324) are used to abut against the wall of the injection hole (311).

2. The sealing device as claimed in claim 1, characterized in that, The slit (3322) is a straight slit.

3. The sealing device as described in claim 2, characterized in that, The first contact area (3323) and the second contact area (3324) are symmetrically distributed on both sides of the slit (3322).

4. The sealing device as described in claim 3, characterized in that, The guide part (332) is a rhomboid prism structure, and the long axis of the rhombus is perpendicular to the length direction of the slit (3322).

5. The sealing device as claimed in claim 1, characterized in that, The guide portion (332) has a prismatic structure, and multiple corners of the guide portion (332) away from the sealing portion (331) are chamfered.

6. The sealing device according to any one of claims 1-5, characterized in that, Both the sealing part (331) and the guiding part (332) include resin and rubber, and the sulfur content of the sealing part (331) is less than that of the guiding part (332).

7. The sealing device according to any one of claims 1-5, characterized in that, The sealing part (331) has external threads, or both the sealing part (331) and the guide part (332) have external threads.

8. The sealing device as claimed in claim 7, characterized in that, The sealing part (331) has a groove (3327) on its end face away from the guide part (332), the groove (3327) being used to accommodate an external tool to cause the sealing device (33) to rotate.

9. An energy storage device, characterized in that, include: The housing (10) includes a receiving cavity (11) with an opening. The electrode assembly (20) is housed within the receiving cavity (11); The end cap assembly (30) includes a cover plate (31), a sealing pin (34), and a sealing device (33) according to any one of claims 1-8, wherein the cover plate (31) seals the opening of the receiving cavity (11) and has an injection hole (311), the sealing device (33) is sealed in the injection hole (311), the sealing pin (34) is welded in the injection hole (311), and the sealing device (33) is located on the side close to the electrode assembly (20).

10. The energy storage device as described in claim 9, characterized in that, The injection hole (311) has an internal thread on its wall. The sealing device (33) is screwed into the injection hole (311), and the mean diameter of the external thread on the sealing device (33) is greater than the mean diameter of the internal thread on the injection hole (311).

11. An electrical appliance, characterized in that, The electrical equipment (400) includes the energy storage device (100) as described in claim 9 or 10, and the energy storage device (100) supplies power to the electrical equipment (400).

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