Battery cell, battery apparatus, and electrical device

Abstract

The present application relates to a battery cell, a battery apparatus, and an electrical device. The battery cell comprises: a housing, an accommodating cavity being provided in the interior of the housing, and the housing being provided with a gas injection hole in communication with the accommodating cavity; a solid-state electrode assembly, disposed in the accommodating cavity; and a sealing assembly, which is removably and sealingly disposed in the gas injection hole. In the present application, the housing is first provided with the gas injection hole in communication with the accommodating cavity, a tracer gas can be injected into the accommodating cavity by means of the gas injection hole, and then the gas injection hole is sealed by means of the sealing assembly. In this way, the content of the tracer gas in the environment can be measured in a timely manner during cycling and use of the battery cell, thereby more accurately reflecting a leakage condition of the battery cell, and improving the efficiency and accuracy of air-tightness detection.

Description

Battery cells, battery devices and electrical equipment Related applications

[0001] This application claims priority to Chinese patent application filed on December 10, 2024, application number 2024230463660, entitled "Battery Cell, Battery Device and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0003] During cyclic use, solid-state battery cells may leak, affecting the overall performance of the battery. However, airtightness testing of solid-state battery cells is difficult, making it challenging to monitor leaks in a timely manner and thus impacting the performance of the individual cells. Summary of the Invention

[0004] Based on this, this application provides a battery cell, a battery device, and an electrical appliance.

[0005] In a first aspect, this application provides a battery cell, including a housing, a solid electrode assembly, and a sealing assembly. The housing has an internal cavity and an injection hole communicating with the cavity is provided on the housing. The solid electrode assembly is disposed in the cavity. The sealing assembly is detachable and sealed in the injection hole.

[0006] Therefore, tracer gas can be injected into the containment cavity through the gas injection port, and then the gas injection port can be sealed by the sealing component. In this way, the content of tracer gas in the environment can be detected in a timely manner during the cycle of battery cell, so as to more accurately reflect the leakage of battery cell and improve the efficiency and accuracy of airtightness detection.

[0007] In some embodiments, the battery cell further includes a connecting portion surrounding the vent hole, the connecting portion being integrally formed with the housing and used for connection with a sealing assembly.

[0008] Therefore, the integral molding of the connecting part and the housing ensures the sealing of the connection between the connecting part and the housing, and the connecting part can be used to connect with the sealing assembly, providing a connection base so that the sealing assembly can more stably seal the air injection hole.

[0009] In some embodiments, the sealing assembly includes a first seal and a second seal. A connecting channel is formed through the first seal, and the first seal is sealed to the connecting portion. One end of the connecting channel is connected to the air injection port. The second seal is sealed at the other end of the connecting channel away from the air injection port.

[0010] The above structure enables a sealed connection between the sealing component and the connecting part, and also seals the vent hole, thereby improving the sealing stability of the battery cell.

[0011] In some embodiments, the first seal and the second seal are made of different materials, and the hardness of the first seal is greater than that of the second seal.

[0012] Thus, the connecting part, the first seal, and the second seal together form a composite structure of three different materials, which can improve the sealing effect. In addition, the first seal can be more stably sealed to the connecting part, and the second seal can be sealed in the connecting channel, thereby achieving a good seal of the air injection hole.

[0013] In some embodiments, the material of the first seal includes one of plastic, polyetheretherketone, polyimide, polytetrafluoroethylene, and polyethylene terephthalate.

[0014] In some embodiments, the material of the second seal includes one of rubber, polyimide, polytetrafluoroethylene, polyvinyl chloride, polypropylene, and polyethylene.

[0015] The above structure forms a composite structure of metal and plastic between the battery cell and the connecting part, which gives the battery cell high sealing performance and improves the sealing stability of the battery cell.

[0016] In some embodiments, the first sealing element includes an integrally formed first body and a baffle grille, a connecting channel is formed on the first body, the first body is sealed to the connecting portion, and the baffle grille surrounds the outer periphery of the first body and the connecting portion.

[0017] Thus, when tracer gas is injected into the containment cavity through the connecting channel and the gas injection port, the baffle grid can shield the gas and prevent the injected gas from washing away the battery cells.

[0018] In some embodiments, the second seal includes a second body and a stop portion connected to one end of the second body. The diameter of the second body is not less than the inner diameter of the connecting channel, and the diameter of the stop portion is greater than the diameter of the second body, so that when the end of the second body away from the stop portion is inserted into the connecting channel, the stop portion can abut against the first seal.

[0019] With the above structure, the second body can be interference-fitted with the channel wall of the connecting channel, and more stably sealed in the connecting channel, improving the sealing performance; at the same time, the stop part can limit the position of the second body in the connecting channel, so that the second seal can be stably sealed in the connecting channel.

[0020] In some embodiments, the second seal further includes an elastic sealing portion connected to one end of the second body away from the stop portion and disposed around the outer periphery of the second body.

[0021] Therefore, the elastic sealing part is disposed around the outer periphery of the second body. When the second body is inserted into the connecting channel, the elastic sealing part can undergo elastic deformation and fill the gap between the second body and the channel wall of the connecting channel, thereby further improving the sealing performance.

[0022] In some embodiments, the resilient sealing portion includes a first end connected to the second body and a second end away from the second body, and the diameter of the resilient sealing portion gradually decreases from the first end to the second end along the axial direction of the connection channel; wherein the diameter of the first end is larger than the diameter of the second body.

[0023] The above structure can guide the second body during insertion into the connecting channel, allowing the second body to be inserted into the connecting channel more smoothly; at the same time, the first end can also compress and fill the space between the second body and the channel wall of the connecting channel, improving the sealing effect.

[0024] Secondly, this application also provides a battery device, including a battery cell as described above, wherein the battery cell is a solid-state battery cell.

[0025] Thirdly, this application also provides an electrical device, including the battery device described above.

[0026] The aforementioned battery cell, battery device, and electrical equipment first have an injection port on the outer casing that communicates with the receiving cavity. Tracer gas can be injected into the receiving cavity through the injection port, and then the injection port is sealed by a sealing component. In this way, the content of tracer gas in the environment can be detected in a timely manner during the cycle of battery cell use, thereby more accurately reflecting the leakage of battery cell and improving the efficiency and accuracy of airtightness detection. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0028] Figure 1 is a schematic diagram of the structure of a battery cell according to one or more embodiments.

[0029] Figure 2 is a schematic diagram of the structure of the sealing assembly in a battery cell according to one or more embodiments.

[0030] Figure 3 is a schematic diagram of the structure of the second seal in a battery cell according to one or more embodiments.

[0031] Figure 4 is a structural schematic diagram of the pressure-bonding nail device and the battery cell according to one or more embodiments.

[0032] Explanation of reference numerals in the attached drawings: 100, battery cell; 200, pressure pin device; 201, third body; 202, sealing nozzle; 203, first channel; 204, first branch; 205, second branch; 206, second channel; 207, third channel; 208, pressure rod; 10, outer shell; 20, sealing assembly; 30, connecting part; 11, air injection hole; 21, first seal; 22, second seal; 23, connecting channel; 211, first body; 212, baffle grid; 221, second body; 222, stop part; 223, elastic sealing part; 224, first end; 225, second end; a, axial direction. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0040] Traditional battery cells typically include a casing and an electrode assembly disposed inside the casing. The casing surrounds the electrode assembly and is filled with electrolyte so that the electrode assembly can be fully immersed in the electrolyte.

[0041] Compared to traditional battery cells, solid-state battery cells replace the electrolyte with a solid electrolyte layer sandwiched between the positive and negative electrode plates. Solid-state battery cells offer higher safety and higher energy density, and are therefore being used more and more widely.

[0042] For a solid-state battery cell, the positive electrode, electrolyte layer, and negative electrode are stacked sequentially to form a solid-state electrode assembly. That is, there is a solid-solid surface contact between the electrolyte layer and the positive and negative electrodes.

[0043] Solid-state battery cells may leak during cyclic use, but testing the airtightness of solid-state battery cells is difficult. When using sulfide electrolytes, leaks will produce hydrogen sulfide upon contact with air. The presence of hydrogen sulfide can be detected by measuring its concentration. However, hydrogen sulfide is a toxic gas, making this detection method challenging to implement.

[0044] When the electrolyte is an oxide or halide, the gas produced during a leak is difficult to detect, making it impossible to determine the actual leak situation.

[0045] Therefore, for solid-state battery cells, the operation of airtightness testing is quite difficult, and it is impossible to detect leakage during the cycling process in a timely manner, which affects the performance of solid-state battery cells.

[0046] Based on the above considerations, to address the challenge of testing the airtightness of solid-state battery cells, one or more embodiments of this application provide a battery cell that first has an injection port on its outer casing communicating with a receiving cavity. Tracer gas can be injected into the receiving cavity through this injection port, and then the injection port is sealed using a sealing assembly. In this way, during cyclic use, the content of tracer gas in the environment can be detected in a timely manner, thereby more accurately reflecting the leakage status of the battery cell and improving the efficiency and accuracy of airtightness testing.

[0047] It should be noted that the battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0048] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0049] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0050] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0051] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0052] Referring to Figures 1 and 2, one embodiment of this application provides a battery cell 100, including a housing 10, a solid-state electrode assembly (not shown in the figures), and a sealing assembly 20. The housing 10 has an internal cavity (not shown in the figures), and a vent hole 11 communicating with the cavity is formed on the housing 10. The solid-state electrode assembly is disposed within the cavity, and the sealing assembly 20 is detachably and sealingly disposed within the vent hole 11.

[0053] It should be noted that the battery cell 100 is the smallest unit that makes up the battery device. The battery cell 100 typically includes a housing 10, a solid electrode assembly, and a sealing assembly 20. The housing 10 is hollow inside, forming a receiving cavity. The solid electrode assembly is placed inside the receiving cavity, and the housing 10 can protect the solid electrode assembly.

[0054] The outer casing 10 typically includes a housing and a top cover. One end of the housing is open, and the top cover is sealed to the opening of the housing, thereby forming a receiving cavity together with the housing.

[0055] A solid-state electrode assembly refers to a structure formed by stacking the positive electrode, electrolyte layer, and negative electrode in a solid state. Therefore, the aforementioned battery cell 100 is a solid-state battery cell 100. Since the solid-state electrode assembly is stacked and then enclosed by the outer casing 10, the solid-state battery cell 100 can be assembled. In other words, for the solid-state battery cell 100, it is not necessary to inject electrolyte into the casing, and therefore, it is not necessary to create an electrolyte injection hole on the outer casing 10.

[0056] Under such circumstances, after the solid electrode assembly and the housing 10 are assembled together to form a solid battery cell 100, it is not convenient to perform airtightness testing on the solid battery cell 100, and it is impossible to monitor the leakage of the solid battery cell 100 in a timely manner.

[0057] Based on this, this application provides a vent 11 on the outer casing 10, which communicates with the receiving cavity. After the solid-state electrode assembly is placed inside the receiving cavity, the cavity can be repeatedly evacuated and filled with tracer gas through the vent 11 until the cavity is filled with tracer gas. Then, the vent 11 is sealed using the sealing assembly 20. When a battery cell 100 leaks, the tracer gas inside the receiving cavity will be released into the environment. For example, the battery cell 100 is usually housed in a casing, with multiple battery cells 100 arranged inside the casing to form a battery device. In this case, the internal environment of the casing can be monitored. If the tracer gas content inside the casing exceeds the standard, it indicates that a battery cell 100 is leaking. In this case, the battery cell 100 can be dealt with promptly to reduce the risk of thermal runaway and other problems.

[0058] Furthermore, the sealing assembly 20 refers to a structure capable of sealing the injection port 11 to maintain a sealed environment within the receiving cavity. Firstly, the sealing assembly 20 is detachably disposed within the injection port 11, enabling the opening and closing of the injection port 11 to facilitate the injection of tracer gas into the receiving cavity. Additionally, when the sealing assembly 20 is disposed within the injection port 11, it seals the injection port 11, maintaining a sealed state within the receiving cavity and providing a suitable working environment for the solid-state electrode assembly.

[0059] Therefore, the tracer gas injected into the cavity can be accommodated through the gas injection port 11, and then the gas injection port 11 can be sealed by the sealing component 20. In this way, the content of tracer gas in the environment can be detected in a timely manner during the cycle of battery cell 100, thereby more accurately reflecting the leakage of battery cell 100 and improving the efficiency and accuracy of airtightness detection.

[0060] In some embodiments, the battery cell 100 further includes a connecting portion 30 surrounding the vent hole 11. The connecting portion 30 is integrally formed with the housing 10 and is used to connect with the sealing assembly 20.

[0061] Specifically, the vent 11 can be located on the top cover, or on the side or bottom of the housing. For ease of understanding, we will take the example of the vent 11 being located on the top cover.

[0062] When the air injection hole 11 is located on the top cover, the connecting part 30 surrounds the outer periphery of the air injection hole 11 and protrudes from the top cover. In other words, the connecting part 30 can form a ring around the outer periphery of the air injection hole 11.

[0063] Furthermore, the connecting part 30 is integrally formed with the outer casing 10. The outer casing 10 is usually made of metal, and the connecting part 30 and the outer casing 10 are integrally formed with the same material, such as aluminum or stainless steel.

[0064] Therefore, the connection part 30 is integrally formed with the outer shell 10, which can ensure the connection and sealing between the connection part 30 and the outer shell 10, and the connection part 30 can be used to connect with the sealing assembly 20, providing a connection base so that the sealing assembly 20 can more stably seal the air injection hole 11.

[0065] In some embodiments, the sealing assembly 20 includes a first sealing member 21 and a second sealing member 22. A connecting channel 23 is formed through the first sealing member 21, and the first sealing member 21 is sealed to the connecting portion 30. One end of the connecting channel 23 is connected to the air injection hole 11. The second sealing member 22 is sealed at the other end of the connecting channel 23 away from the air injection hole 11.

[0066] Specifically, the first sealing element 21 refers to a component that can be connected between the connecting portion 30 and the second sealing element 22 to achieve a stable seal of the air injection port 11. The second sealing element 22 refers to a component that can be plugged into the connecting channel 23 to seal the air injection port 11.

[0067] To better match and connect with the connecting part 30, the first sealing element 21 can be configured as a cylindrical structure, with a connecting channel 23 extending through the middle of the first sealing element 21. The first sealing element 21 is sealed to the connecting part 30, specifically by using an adhesive sealant. At this time, one end of the connecting channel 23 is connected to the air injection hole 11, and the second sealing element 22 is placed at the other end of the connecting channel 23 to seal the air injection hole 11.

[0068] The above structure enables a sealed connection between the sealing assembly 20 and the connecting part 30, and also enables the sealing of the air injection hole 11, thereby improving the sealing stability of the battery cell 100.

[0069] In some embodiments, the first seal 21 and the second seal 22 are made of different materials, and the hardness of the first seal 21 is greater than that of the second seal 22.

[0070] It should be noted that the connecting part 30 is integrally formed with the outer shell 10, that is, the connecting part 30 is made of metal material, which has high rigidity. Therefore, by setting the first sealing element 21 and the second sealing element 22, on the one hand, the first sealing element 21 can be connected more tightly with the connecting part 30, and on the other hand, the second sealing element 22 can be interference-fitted with the first sealing element 21, thereby improving the sealing stability of the air injection hole 11.

[0071] Specifically, the first seal 21 and the second seal 22 are made of different materials, and the hardness of the first seal 21 is greater than that of the second seal 22. That is, the elasticity of the second seal 22 is greater than that of the first seal 21.

[0072] Thus, the connecting part 30, the first sealing element 21 and the second sealing element 22 together form a composite structure of three different materials, which can improve the sealing effect; in addition, the first sealing element 21 can be more stably sealed to the connecting part 30, and the second sealing element 22 can be sealed in the connecting channel 23, thereby achieving a good seal of the air injection hole 11.

[0073] In some embodiments, the material of the first seal 21 includes one of plastic, polyetheretherketone, polyimide, polytetrafluoroethylene, and polyethylene terephthalate. In some embodiments, the material of the second seal 22 includes one of rubber, polyimide, polytetrafluoroethylene, polyvinyl chloride, polypropylene, and polyethylene.

[0074] Specifically, the first sealing element 21 can be made of plastic. When the first sealing element 21 is sealed to the connecting part 30, the composite structure of metal and plastic formed between the two has high sealing performance, thereby improving the airtightness of the battery cell 100.

[0075] Furthermore, the second seal 22 can be made of rubber, specifically fluororubber, which can seal more tightly in the connection channel 23 and has higher reliability.

[0076] Through the above structure, a composite structure of metal and plastic is formed between the battery cell 100 and the connecting part 30, which gives the battery cell 100 higher sealing performance and improves the sealing stability of the battery cell 100.

[0077] In some embodiments, the first sealing member 21 includes an integrally formed first body 211 and a baffle grille 212, a connecting channel 23 is formed on the first body 211, the first body 211 is sealed to the connecting portion 30, and the baffle grille 212 surrounds the outer periphery of the first body 211 and the connecting portion 30.

[0078] Specifically, the first body 211 and the baffle grille 212 are integrally formed, that is, both the first body 211 and the baffle grille 212 can be made of plastic material, wherein the baffle grille 212 is connected to the outer periphery of the first body 211.

[0079] A connecting channel 23 is formed on the first body 211, and the first body 211 and the connecting part 30 are sealed together by adhesive. At this time, one end of the connecting channel 23 is connected to the air injection hole 11.

[0080] When the first main body 211 is connected to the connecting part 30, the baffle grille 212 surrounds the outer periphery of the first main body 211 and the connecting part 30, thus shielding the connection position between the first main body 211 and the connecting part 30. In this way, when tracer gas is injected into the receiving cavity through the connecting channel 23 and the gas injection hole 11, the baffle grille 212 can shield the gas, preventing the injected gas from scouring the battery cell 100.

[0081] In some embodiments, the second seal 22 includes a second body 221 and a stop portion 222 connected to one end of the second body 221. The diameter of the second body 221 is not less than the inner diameter of the connecting channel 23, and the diameter of the stop portion 222 is greater than the diameter of the second body 221, so that when the end of the second body 221 away from the stop portion 222 is inserted into the connecting channel 23, the stop portion 222 can abut against the first seal 21.

[0082] Specifically, the second body 221 serves as the main structure for sealing. When the second sealing member 22 is used to seal the connecting channel 23, the second body 221 is inserted into the connecting channel 23. Since the diameter of the second body 221 is not less than the inner diameter of the connecting channel 23, and the second sealing member 22 is elastic, the second body 221 can be interference-fitted with the channel wall of the connecting channel 23 so that the second body 221 can seal the connecting channel 23.

[0083] Furthermore, the stop portion 222 is connected to one end of the second body 221. That is, the end of the second body 221 facing away from the stop portion 222 can be inserted into the connecting channel 23 to provide a sealing effect. The end of the second body 221 connected to the stop portion 222 has a larger diameter than the second body 221. When the second body 221 is partially inserted into the connecting channel 23, the stop portion 222 can abut against the first body 211 of the first sealing member 21 along the axial direction a of the connecting channel 23. In this way, the stop portion 222 can limit the position of the second body 221 within the connecting channel 23, so that the second sealing member 22 can be stably sealed in the connecting channel 23.

[0084] With the above structure, the second body 221 can be interference-fitted with the channel wall of the connecting channel 23, and more stably sealed in the connecting channel 23, improving the sealing performance; at the same time, the stop part 222 can limit the position of the second body 221 in the connecting channel 23, so that the second seal 22 can be stably sealed in the connecting channel 23.

[0085] In some embodiments, the second seal 22 further includes an elastic sealing portion 223, which is connected to one end of the second body 221 away from the stop portion 222 and is disposed around the outer periphery of the second body 221.

[0086] Specifically, the elastic sealing part 223 is connected to the end of the second body 221 away from the stop part 222, that is, the elastic sealing part 223 is connected to the end of the second body 221 located in the connecting channel 23. In addition, the elastic sealing part 223 is disposed around the outer periphery of the second body 221. When the second body 221 is inserted into the connecting channel 23, the elastic sealing part 223 can undergo elastic deformation and fill the gap between the second body 221 and the channel wall of the connecting channel 23, thereby further improving the sealing performance.

[0087] As shown in Figure 3, in some embodiments, the elastic sealing portion 223 includes a first end 224 connected to the second body 221 and a second end 225 away from the second body 221. Along the axial direction a of the connecting channel 23, the diameter of the elastic sealing portion 223 gradually decreases from the first end 224 to the second end 225. The diameter of the first end 224 is larger than the diameter of the second body 221.

[0088] Specifically, the elastic sealing portion 223 is formed into a conical structure, that is, the diameter of the second end 225 of the elastic sealing portion 223 away from the second body 221 is smaller, and the diameter gradually increases from the second end 225 to the first end 224.

[0089] Thus, during the process of inserting the second body 221 into the connecting channel 23, the elastic sealing part 223 can play a certain guiding role, so that the second body 221 can be inserted into the connecting channel 23 more smoothly.

[0090] Furthermore, the diameter of the first end 224 is larger than the diameter of the second body 221, that is, the first end 224 is arranged around the outer periphery of the second body 221. In this way, during the process of inserting the second body 221 into the connecting channel 23, the first end 224 is gradually compressed and fills the space between the second body 221 and the channel wall of the connecting channel 23, thus playing a sealing role.

[0091] The above structure can guide the second body 221 during insertion into the connecting channel 23, allowing the second body 221 to be inserted into the connecting channel 23 more smoothly; at the same time, the first end 224 can also compress and fill the space between the second body 221 and the channel wall of the connecting channel 23, improving the sealing effect.

[0092] As shown in Figure 4, it should be noted that after the first sealing member 21 is sealed and connected to the connecting part 30, the second sealing member 22 can be sealed in the connecting channel 23 using the pressure nail device 200.

[0093] Specifically, the pressure-pressing nail device 200 includes a third body 201 and a sealing nozzle 202. A first channel 203 is formed through the third body 201, and the sealing nozzle 202 is connected to one end of the third body 201. During operation, the sealing nozzle 202 surrounds the outer periphery of the first sealing member 21, so that the first channel 203 communicates with the connecting channel 23. A pressure rod 208 is inserted into the other end of the first channel 203 away from the connecting channel 23, and the pressure rod 208 can reciprocate within the first channel 203.

[0094] The inner diameter of the first channel 203 matches the diameter of the first seal 21, so that the first seal 21 can be stably placed in the first channel 203. When the first seal 21 is placed in the first channel 203, the pressure rod 208 can be used to move the first seal 21 in the first channel 203 to press the first seal 21 into the connecting channel 23, thereby achieving a seal between the first seal 21 and the connecting channel 23.

[0095] Furthermore, the pressure nail device 200 also includes a first branch 204 and a second branch 205 connected to the third body 201, wherein the first branch 204 and the second branch 205 are respectively inclined relative to the third body 201, and a second channel 206 is opened through the first branch 204, and a third channel 207 is opened through the second branch 205, wherein the second channel 206 and the third channel 207 are respectively connected to the first channel 203.

[0096] Specifically, the first seal 21 can be placed in the second channel 206, and then the first seal 21 can be brought to the first channel 203 via the second channel 206. In the first channel 203, the first seal 21 can be pressed into the connecting channel 23 by the pressure rod 208.

[0097] The third channel 207 can be used to inject tracer gas into the connecting channel 23 and the gas injection port 11, and to perform vacuum treatment in the containment cavity.

[0098] Based on the same concept as the battery cell 100 described above, this application also provides a battery device, including the battery cell 100 as described above, wherein the battery cell 100 is a solid-state battery cell.

[0099] Based on the same concept as the battery device described above, this application also provides an electrical device including the battery device described above.

[0100] According to one or more embodiments, in specific use, the first body 211 and the connecting part 30 are first sealed with adhesive to achieve a sealed connection between the first body 211 and the connecting part 30. At this time, the baffle grille 212 surrounds the outer periphery of the first body 211 and the connecting part 30.

[0101] Furthermore, the sealing nozzle 202 of the pressure-fitting nail device 200 is connected to the first sealing element 21, so that the first channel 203 and the connecting channel 23 are interconnected. Then, the cavity is evacuated through the third channel 207, and tracer gas is injected into the cavity. By repeating the evacuation and injection process multiple times, the tracer gas can be filled into the cavity.

[0102] The first sealing element 21 is placed into the second channel 206, so that the first sealing element 21 enters the first channel 203 through the second channel 206. Then, the first sealing element 21 is pressed into the connecting channel 23 by the pressure rod 208, so that the first sealing element 21 can block the connecting channel 23, thereby achieving the sealing of the air injection hole 11.

[0103] During the cyclic use of the battery cell 100, the content of tracer gas in the environment can be detected. If the content of tracer gas exceeds the standard, it indicates that there is a leak in the battery cell 100, and the battery cell 100 can be dealt with in a timely manner.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A single battery cell, comprising: The outer shell has an internal cavity, and an air injection hole communicating with the cavity is provided on the outer shell; A solid electrode assembly is disposed within the receiving cavity; and A sealing assembly is detachably and sealingly disposed within the air injection port.

2. The battery cell according to claim 1, wherein, The battery cell also includes a connecting portion surrounding the vent hole, the connecting portion being integrally formed with the outer shell and used to connect with the sealing assembly.

3. The battery cell according to claim 2, wherein, The sealing assembly includes a first sealing element and a second sealing element. A connecting channel is formed through the first sealing element, and the first sealing element is sealed to the connecting part. One end of the connecting channel is connected to the air injection hole. The second sealing element is sealed at the other end of the connecting channel opposite to the air injection hole.

4. The battery cell according to claim 3, wherein, The first seal and the second seal are made of different materials, and the hardness of the first seal is greater than that of the second seal.

5. The battery cell according to claim 4, wherein, The material of the first seal includes one of plastic, polyetheretherketone, polyimide, polytetrafluoroethylene, and polyethylene terephthalate.

6. The battery cell according to claim 4 or 5, wherein, The material of the second seal includes one of rubber, polyimide, polytetrafluoroethylene, polyvinyl chloride, polypropylene, and polyethylene.

7. The battery cell according to any one of claims 3-6, wherein, The first sealing element includes an integrally formed first body and a baffle grille. The connecting channel is opened on the first body. The first body is sealed to the connecting part. The baffle grille surrounds the outer periphery of the first body and the connecting part.

8. The battery cell according to any one of claims 3-7, wherein, The second sealing element includes a second body and a stop portion connected to one end of the second body. The diameter of the second body is not less than the inner diameter of the connecting channel, and the diameter of the stop portion is greater than the diameter of the second body, so that when the end of the second body away from the stop portion is inserted into the connecting channel, the stop portion can abut against the first sealing element.

9. The battery cell according to claim 8, wherein, The second seal further includes an elastic sealing portion, which is connected to one end of the second body away from the stop portion and is disposed around the outer periphery of the second body.

10. The battery cell according to claim 9, wherein, The elastic sealing part includes a first end connected to the second body and a second end away from the second body. Along the axial direction of the connection channel, the diameter of the elastic sealing part gradually decreases from the first end to the second end. The diameter of the first end is larger than the diameter of the second body.

11. A battery device comprising a battery cell as described in any one of claims 1-10, wherein the battery cell is a solid-state battery cell.

12. An electrical device comprising the battery device as described in claim 11.

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