Battery cell, battery apparatus, electrical apparatus and blocking assembly

Abstract

The present application relates to a battery cell, a battery apparatus, an electrical apparatus and a blocking assembly. The blocking assembly is used for blocking a first through hole, so as to cut off the communication between the inside and the outside of a battery cell, effectively blocking water. A support and a sealing body are introduced into the blocking assembly, such that by means of the support, the sealing body is stably assembled in the first through hole. In addition, when subjected to a force directed towards the inside of a casing, the sealing body is at least partially separated from the support, such that the inside of the casing is communicated with the outside by means of a second through hole so as to stably discharge a gas or inject an electrolyte. When subjected to a force directed towards the outside of the casing and overcoming the acting force between the blocking assembly and the wall of the first through hole, the blocking assembly can be entirely discharged from the first through hole. Therefore, if the internal pressure of the battery cell increases to a certain value, the blocking assembly can overcome the acting force between the blocking assembly and an end cover and is thus discharged from the first through hole, effectively relieving the pressure.

Description

Battery cells, battery devices, electrical equipment and sealing components Related applications

[0001] This application claims priority to Chinese patent application filed on January 23, 2025, with application number 2025101097483, entitled "Battery cell, battery device, electrical equipment and sealing assembly", 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 battery cells, battery devices, electrical equipment, and sealing components. Background Technology

[0003] With the rapid development of battery technology, higher requirements have been placed on battery reliability. To reduce the risks caused by increased internal pressure during battery use, explosion-proof components are usually installed on the battery end caps. However, due to the limited structural design of traditional explosion-proof components, their functions are singular, leading to the need for additional equipment or humidity control measures in the battery manufacturing process, thus increasing battery production costs. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery cell, battery device, electrical equipment, and sealing component that can achieve stable venting and liquid injection while ensuring explosion protection, thereby reducing the cost of battery production.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing having a first through hole; an electrode assembly housed within the housing; and a sealing assembly disposed in the first through hole; wherein the sealing assembly includes a bracket and a sealing body, the bracket being sealedly fitted to the wall of the first through hole, the bracket having a second through hole, the sealing body being at least partially inserted into the second through hole and sealingly engaged with the second through hole, the sealing body being configured such that when subjected to a force toward the inside of the housing, it is at least partially separated from the bracket, thereby allowing communication between the inside of the housing and the outside; when subjected to a force toward the outside of the housing that overcomes the force between the sealing assembly and the wall of the first through hole, the sealing assembly can be discharged from the first through hole.

[0006] The aforementioned battery cell utilizes a sealing assembly to seal within a first through-hole, effectively isolating the cell's interior from the outside and achieving water resistance. The sealing assembly incorporates a support and a sealing body. The support securely mounts the sealing body within the first through-hole. Simultaneously, when the sealing body is subjected to a force directed inwards towards the casing, it at least partially separates from the support, allowing communication between the casing's interior and the outside through a second through-hole. This allows for the injection of electrolyte into the battery cell; alternatively, gas inside the battery cell can be expelled during baking, achieving stable venting or electrolyte injection. Since the sealing assembly can be completely discharged from the first through-hole when subjected to a force directed outwards towards the casing and overcoming the force between the sealing assembly and the wall of the first through-hole, if the internal pressure of the battery cell increases to a certain value, the sealing assembly can overcome the force between itself and the end cap and discharge from the first through-hole, achieving effective pressure relief. This design, while achieving explosion-proof protection, enables stable venting and electrolyte injection, reducing battery production costs.

[0007] In some embodiments, the sealing body includes a cover and a seal; the cover is disposed on the surface of the support facing the outside of the housing and is at least partially located in the second through hole and connected to the seal; the seal seals against the end of the second through hole facing the inside of the housing and, when subjected to a force toward the inside of the housing, at least partially separates from the end of the second through hole. This design, introducing the cover and the seal, allows the cover to apply a force toward the outside of the housing to the seal, causing the seal to tightly abut against the end of the second through hole, achieving a pre-compression force and improving the airtightness of the battery cell.

[0008] In some embodiments, the cover includes a covering portion and an elastic connecting portion connected to the covering portion. The covering portion is disposed on the surface of the bracket facing the outer surface of the housing, and the elastic connecting portion is disposed in the second through hole and connected to the seal. This design, with the covering portion and the elastic connecting portion, facilitates the connection between the covering and the seal, allowing the covering to stably apply a lifting force to the seal, thereby ensuring that the seal tightly abuts against one end of the second through hole, achieving effective water sealing.

[0009] In some embodiments, the resilient connection portion is provided with a channel hole, which is configured to connect the interior of the housing to the outside when the seal is separated from the second through hole. This design introduces the channel hole, enabling effective liquid injection or venting after the seal and the second through hole are separated.

[0010] In some embodiments, the elastic connector is configured as an annular structure and surrounds the seal to form a flow channel communicating with the outside. A channel hole is located on the inner wall of the elastic connector facing the flow channel, and when the seal is separated from the second through hole, it is at least partially located outside the end of the second through hole facing the interior of the housing. This design, with the elastic connector being an annular hollow structure, allows the housing to maintain communication with the outside through the channel hole and the flow channel in sequence, thereby enabling effective liquid injection and baking / venting operations.

[0011] In some embodiments, the channel holes include a plurality of channels, at least some of which are spaced apart circumferentially along the elastic connection portion. This design introduces multiple channel holes circumferentially into the elastic connection portion, allowing the electrolyte to enter the casing through different channel holes during the electrolyte injection process. This not only ensures uniform electrolyte entry but also reduces the buffering force of the electrolyte entering the casing, achieving stable electrolyte injection. Simultaneously, during baking and venting, gases can be discharged from the battery cells through different channel holes, improving venting efficiency.

[0012] In some embodiments, the seal includes a main body and a surrounding edge. The surrounding edge is connected circumferentially to the main body and partially covers the main body. The surrounding edge is connected to a covering element. The main body abuts against one end of the second through hole, and the surrounding edge seals between the main body and one end of the second through hole. This design, with the seal consisting of a main body and a surrounding edge, ensures that when sealing the second through hole, the surrounding edge is sandwiched between the second through hole and the main body, improving the sealing effect.

[0013] In some embodiments, a groove is provided on the side of the main body facing away from the housing, and a surrounding edge is provided around the outer periphery of the groove. The groove is used for the insertion of a force-applying component. This design introduces the groove, which facilitates the force-applying component to apply stable pressure to the main body, so that liquid injection or venting can be carried out stably. At the same time, it can also reduce the structural strength of the main body, making it easier for the main body and the surrounding edge to pass through the second through hole together, so as to quickly complete the assembly of the seal.

[0014] In some embodiments, when the main body is configured to be subjected to a force facing outwards from the housing and allowing the seal to overcome the force between itself and the support, both the main body and the perimeter portion are discharged out of the second through-hole, and the perimeter portion is flipped from the main body to the side of the main body facing the second through-hole. This design facilitates a rapid response of the sealing assembly to changes in the internal pressure of the battery cell, achieving effective pressure relief; at the same time, it also helps to reduce the amount and range of electrolyte ejected outwards, improving the stability of pressure relief.

[0015] In some embodiments, the bracket includes a mounting surface circumferentially disposed around the second through hole and facing away from the second through hole, a sealing body at least partially covering the mounting surface, the mounting surface abutting against the wall of the first through hole, and the sealing body sealing between the mounting surface and the wall of the first through hole. This design introduces a mounting surface to facilitate the sealing fit of the bracket against the wall of the first through hole, thereby completing the sealed assembly of the bracket in the first through hole.

[0016] In some embodiments, a groove is provided on the mounting surface around the outer periphery of the bracket, and the sealing body is at least partially covered within the groove. The groove wall is used to abut against the wall of the first through hole. This design, with the groove on the mounting surface, ensures a stable connection between the bracket and the wall of the first through hole, improving the sealing performance between them.

[0017] In some embodiments, the groove wall of the card slot includes a first sidewall and a second sidewall disposed opposite to each other along the thickness direction of the bracket, and the distance D between the first sidewall and the second sidewall gradually increases from the end of the card slot near the second through hole to the end of the card slot away from the second through hole. This design, with the distance D between the first sidewall and the second sidewall being smaller closer to the second through hole, makes it easier for the wall of the first through hole to abut against the first sidewall and / or the second sidewall. This simplifies the design of the card slot while achieving an effective sealing assembly, thereby making it easier for the wall of the first through hole to abut against the groove wall of the card slot.

[0018] In some embodiments, the mounting surface includes a guide surface located on the side of the slot facing the interior of the housing. The guide surface is inclined relative to the thickness direction of the bracket, and the end of the guide surface away from the slot is closer to the second through hole than the end of the guide surface near the slot. This design, with its inclined guide surface, guides the bracket into the first through hole, allowing the hole wall of the first through hole to fit more smoothly into the slot, thereby improving the assembly efficiency of the sealing assembly.

[0019] In some embodiments, the bracket is provided with a deformation channel extending to the mounting surface, the deformation channel communicating with the second through hole and penetrating the bracket along its thickness direction. This design introduces a deformation channel, allowing the bracket to elastically contract at the deformation channel, reducing its overall size and facilitating its insertion into the first through hole, further improving the assembly efficiency of the sealing assembly.

[0020] In some embodiments, the deformation channel includes a first channel segment and a second channel segment that are interconnected. The first channel segment is connected to a second through hole, and the end of the second channel segment away from the first channel segment extends to the mounting surface. The circumferential dimension L2 of the second channel segment along the bracket is greater than the circumferential dimension L1 of the first channel segment along the bracket. This design, by introducing first and second channel segments of different sizes, increases the radial deformation of the bracket, thereby better accommodating the deformation of the bracket when it is inserted into the first through hole, and thus ensuring the bracket is stably fixed in the first through hole.

[0021] In some embodiments, the second channel segment includes a first channel portion and a second channel portion that are sequentially connected along the thickness direction of the support. The first channel portion and the second channel portion are offset circumferentially along the support. A first protrusion protruding towards the second channel portion is formed on one side of the first channel portion along the thickness direction of the support and facing the second channel portion. A second protrusion protruding towards the first channel portion is formed on one side of the second channel portion along the thickness direction of the support. The first protrusion and the second protrusion are spaced apart in the thickness direction of the support. This design, with the second channel segment having offset first and second channel portions, increases the flow resistance in the second channel segment while satisfying the effective shrinkage deformation of the support at the second channel segment. It reduces the probability of the seal bulging due to gas entering the second channel segment and improves the reliability of the water-proof seal of the battery cell.

[0022] In some embodiments, the surface of the support along its thickness direction includes an outer surface disposed away from the inner casing, and a drainage groove is provided on the outer surface surrounding the outer periphery of the second through hole. This design introduces the drainage groove, allowing electrolyte remaining on the outer surface of the support to converge into the second through hole, thereby reducing contamination on the surface of the battery cells.

[0023] In some embodiments, one surface of the bracket along its thickness direction includes an inner surface, which is disposed facing into the housing and arched along a side away from the housing. This design introduces an arched inner surface on one side of the bracket, making it easier for the bracket to deform inwards, facilitating the bracket's discharge from the first through-hole and improving the pressure relief effect.

[0024] In some embodiments, the housing includes a housing and an end cap disposed on the housing, the electrode assembly is housed between the housing and the end cap, and a first through-hole is provided on the end cap. This design introduces the end cap and housing to provide a closed space for the electrode assembly.

[0025] Secondly, this application provides a battery device, which includes any of the above-mentioned battery cells.

[0026] Thirdly, this application provides an electrical device that includes the battery device described above.

[0027] Fourthly, this application provides a sealing assembly, comprising: a bracket having a second through hole; and a sealing body including a cover and a sealing element, the cover and the sealing element being respectively disposed on two surfaces of the bracket along its thickness direction, the sealing element sealingly abutting against one end of the second through hole, the cover being at least partially located in the second through hole and connected to the sealing element; the sealing element being configured such that when subjected to a force in the direction from the cover to the sealing element, it is at least partially separated from one end of the second through hole. This design, by introducing the cover and the sealing element, allows the cover to apply a force towards the outside of the casing to the sealing element, causing the sealing element to tightly abut against one end of the second through hole, achieving pre-compression and improving the airtightness of the battery cell.

[0028] In some embodiments, the cover includes a cover portion and an elastic connecting portion connected to the cover portion. The cover portion is disposed on the surface of the support along its own thickness direction. The elastic connecting portion is disposed in the second through hole and connected to the seal. The elastic connecting portion has a channel hole configured to connect both sides of the second through hole along the thickness direction of the support when the seal is separated from the second through hole. This design, by introducing the channel hole, allows the outer shell to connect to the outside after the seal and the second through hole are separated, enabling effective liquid injection or venting.

[0029] In some embodiments, the bracket includes a mounting surface circumferentially disposed around the second through hole and facing away from the second through hole. A sealing body at least partially covers the mounting surface. The bracket has a deformation channel extending to the mounting surface, communicating with the second through hole, and penetrating the bracket along its thickness direction. This design introduces a mounting surface, facilitating a sealing fit of the bracket against the wall of the first through hole, thereby completing the sealed assembly of the bracket within the first through hole.

[0030] In some embodiments, the sealing assembly further includes a force-applying element, which is at least partially inserted into the second through-hole and abuts against the seal. This design, by introducing the force-applying element, facilitates stable pressure application to the seal, enabling stable injection or venting. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0032] Figure 1 is a schematic diagram of the vehicle structure in some embodiments of this application.

[0033] Figure 2 is an exploded view of the battery device in some embodiments of this application.

[0034] Figure 3 is an exploded view of a single battery cell in some embodiments of this application.

[0035] Figure 4 is an exploded view of the sealing component in some embodiments of this application.

[0036] Figure 5 is a cross-sectional view of the sealing component assembled in the first through hole in some embodiments of this application.

[0037] Figure 6 is a structural cross-sectional view of the sealing component in some embodiments of this application.

[0038] Figure 7 is a structural cross-sectional view of the sealing component and the force-applying component in some embodiments of this application.

[0039] Figure 8 is a cross-sectional view of the structure in some embodiments of this application, showing the seal being discharged outside the bracket.

[0040] Figure 9 is a schematic diagram of the structure of the bracket in some embodiments of this application.

[0041] Figure 10 is a structural cross-sectional view of the bracket in some embodiments of this application.

[0042] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 10, Battery Cell; 20, Housing; 201, First Part; 202, Second Part; 1, Outer Shell; 11, Housing; 111, Opening; 12, End Cap; 13, First Through Hole; 2, Electrode Assembly; 3, Sealing Assembly; 31, Bracket; 311, Second Through Hole; 312, Mounting Surface; 313, Outer Surface; 314, Inner Surface; 315, Guide Surface; 316, Drainage Channel; 32, Sealing Body; 321, Covering; 32a, Covering Part; 32b, Elastic Connection Part; 3b1, Flow Channel; 322, Seal Component; 32c, Main body; 32d, Surrounding edge; 32e, Groove; 32f, Edge; 323, Channel hole; 33, Deformation channel; 331, First channel segment; 332, Second channel segment; 33a, First channel portion; a1, First end; a2, Second end; 33b, Second channel portion; b1, Third end; b2, Fourth end; 33c, First protrusion; c1, First buffer surface; 33d, Second protrusion; d1, Second buffer surface; e1, Buffer channel; 34, Slot; 341, First sidewall; 342, Second sidewall; 35, Force-applying component; 351, Flow channel; X, Thickness direction. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing.

[0051] Battery devices consist of individual battery cells. During cyclic use or manufacturing processes, varying degrees of gas generation can occur within these cells. If this gas cannot be released in time, it can lead to increased internal pressure, causing the cells to bulge and deform. Especially in cases of thermal runaway, the internal pressure of a battery cell can surge dramatically. If pressure relief is not timely, this can easily trigger fires or explosions, affecting the reliability of the battery cell. Traditional pressure relief methods typically involve installing explosion-proof components, such as explosion-proof membranes, on the end caps. When the internal pressure of the battery cell reaches a certain value, the explosion-proof membrane ruptures, allowing the internal gas to escape and achieving effective pressure relief.

[0052] In the battery device manufacturing process, it is necessary to bake and vent the battery cells and inject liquid, which are all achieved through the liquid injection port. Traditional explosion-proof components cannot achieve the venting and liquid injection functions in the battery device production process.

[0053] Based on this, addressing the issue that traditional battery cells have limited explosion-proof functionality, necessitating additional equipment or humidity control measures during battery assembly manufacturing, thus increasing production costs, this application provides a battery cell that utilizes a sealing assembly to seal within a first through-hole, effectively isolating the battery cell from the outside environment and achieving effective water isolation. The sealing assembly incorporates a support and a sealing body. The support stably assembles the sealing body within the first through-hole. Simultaneously, when the sealing body is subjected to a force directed inwards towards the outer casing, it at least partially separates from the support, allowing communication between the inside of the outer casing and the outside environment through a second through-hole. This allows for the injection of electrolyte into the battery cell; alternatively, gas inside the battery cell can be expelled during baking, achieving stable venting or electrolyte injection. Since the sealing assembly can be completely discharged from the first through-hole when subjected to a force directed outwards towards the outer casing and overcoming the force between the sealing assembly and the wall of the first through-hole, if the internal pressure of the battery cell increases to a certain value, the sealing assembly can overcome the force between itself and the end cap and discharge from the first through-hole, achieving effective pressure relief and eliminating the need for traditional explosion-proof valves, sealing aluminum nails, and other components. This design achieves both explosion protection and stable venting and liquid injection, reducing battery production costs.

[0054] Please refer to Figure 1, which is a structural schematic diagram of the vehicle 1000 in some embodiments of this application.

[0055] This application provides an electrical device that uses a battery device 100 as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, energy storage products, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; and energy storage products can include energy storage stations, etc.

[0056] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using a vehicle 1000 as an example of an electrical device.

[0057] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0058] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0059] Please refer to Figure 2, which is an exploded view of the battery device 100 in some embodiments of this application.

[0060] The battery device 100 includes a housing 20 and a battery cell 10, with the battery cell 10 housed within the housing 20. The housing 20 provides a cavity for the battery cell 10 and can have various structures. In some embodiments, the housing 20 may include a first portion 201 and a second portion 202, which overlap each other, together defining a cavity for accommodating the battery cell 10. The second portion 202 may be a hollow structure with an opening 111 at one end, while the first portion 201 may be a plate-like structure, covering the opening side of the second portion 202 so that the first portion 201 and the second portion 202 together define the cavity. Alternatively, both the first portion 201 and the second portion 202 may be hollow structures with an opening 111 on one side, with the opening side of the first portion 201 overlapping the opening side of the second portion 202. Of course, the battery box 20 formed by the first part 201 and the second part 202 can be of various shapes, such as cylinder, cuboid, etc.

[0061] In the battery device 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within the casing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form battery device 100 modules, which are then connected in series, parallel, or in a mixed manner to form a whole and housed within the battery casing 20. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0062] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery device 100, or a magnesium-ion battery, but is not limited to these.

[0063] Please refer to Figure 3, which is an exploded view of the battery cell 10 in some embodiments of this application.

[0064] A battery cell 10 refers to the smallest unit that makes up the battery device 100. A battery cell 10 includes an electrode assembly 2, a housing 11, and an end cap 12.

[0065] Electrode assembly 2 is the component in the battery cell 10 where electrochemical reactions occur. The battery cell 10 may contain one or more electrode assemblies 2. Electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body 32c of the electrode assembly 2, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body 32c or separately at both ends of the main body 32c. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0066] The housing 11 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 10. This internal environment can accommodate the electrode assembly 2, electrolyte, and other components. The housing 11 and the end cap 12 can be independent components. An opening 111 can be provided on the housing 11, and the end cap 12 can be used to close the opening 111 to form the internal environment of the battery cell 10. Alternatively, the end cap 12 and the housing 11 can be integrated. Specifically, the end cap 12 and the housing 11 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 11, the end cap 12 closes the housing 11. The housing 11 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 2. The material of the housing 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This embodiment does not impose any special limitations on this.

[0067] End cap 12 refers to a component that covers the opening 111 of housing 11 to isolate the internal environment of battery cell 10 from the outside. The shape of end cap 12 can be adapted to the shape of housing 11 to fit it. In some embodiments, end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 12 is less prone to deformation under pressure and impact, allowing battery cell 10 to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 12. Electrode terminals can be used for electrical connection with electrode assembly 2 for outputting or inputting electrical energy to battery cell 10. In some embodiments, end cap 12 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 10 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of end cap 12, which can be used to isolate the electrical connection components inside housing 11 from end cap 12 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0068] According to some embodiments of this application, referring to FIG4, this application provides a battery cell 10, which includes: a housing 1 and a sealing assembly 3. The housing 1 has a first through hole 13, and an electrode assembly 2 is housed in the housing 1; the sealing assembly 3 is disposed in the first through hole 13. The sealing assembly 3 includes a bracket 31 and a sealing body 32. The bracket 31 is sealed and fitted to the wall of the first through hole 13. The bracket 31 has a second through hole 311. The sealing body 32 is at least partially inserted into the second through hole 311 and is sealed and fitted with the second through hole 311. The sealing body 32 is configured such that when subjected to a force toward the inside of the housing 1, it is at least partially separated from the bracket 31, so that the inside of the housing 1 communicates with the outside. When the sealing assembly 3 is subjected to a force toward the outside of the housing 1 and overcomes the force between the sealing assembly 3 and the wall of the first through hole 13, the sealing assembly 3 can be discharged from the first through hole 13.

[0069] The outer shell 1 refers to the structure that provides a closed environment for the electrode assembly 2. It can be a structure without the end cap 12, such as an enclosed aluminum shell; or it can be a combination of the shell 11 and the end cap 12. When the sealing assembly 3 is not installed, the first through hole 13 on the outer shell 1 can connect the interior of the outer shell 1 with the outside. The first through hole 13 can be of various types, such as a liquid injection hole on the outer shell 1, an explosion-proof hole, or a hole separately opened on the outer shell 1 for corresponding operations. At the same time, the shape of the first through hole 13 can also be designed in various ways. For example, the first through hole 13 can be designed as a straight hole extending along the thickness direction X of the end cap 12; or the first through hole 13 can also be designed as a multi-segment structure with different diameters, in which case the sealing assembly 3 can be installed on the inner wall between different segments.

[0070] In the sealing assembly 3, the bracket 31 serves as a skeleton structure, allowing the sealing body 32 to be assembled in the first through hole 13. When the bracket 31 is sealed and fixed in the first through hole 13, if the second through hole 311 on the bracket 31 is closed by the sealing body 32, the interior and exterior of the outer casing 1 are disconnected, effectively isolating the interior of the outer casing 1 from water. If the second through hole 311 on the bracket 31 is opened, the interior of the outer casing 1 is connected to the exterior, allowing electrolyte to be injected into the outer casing 1; or water vapor inside the outer casing 1 can be discharged to the exterior through the second through hole 311.

[0071] The bracket 31 is sealed and assembled on the wall of the first through hole 13. This not only ensures the stable fixation of the sealing assembly 3 within the first through hole 13, but also improves the seal between the bracket 31 and the wall of the first through hole 13, reducing the possibility of leakage between the bracket 31 and the wall of the first through hole 13 during normal operation of the battery cell 10. The bracket 31 can be sealed and assembled in various ways within the first through hole 13, such as by snap-fitting onto the wall of the first through hole 13, or by interference fit.

[0072] The sealing body 32 is a structure with a certain elastic function. It is fixed to the bracket 31 and at least partially located in the second through hole 311, which can seal the second through hole 311 and isolate the communication between the inside of the outer shell 1 and the outside. The sealing body 32 can be made of various materials, such as rubber. There are various ways to fix the sealing body 32 to the bracket 31, such as pressing, snapping, or bonding. Furthermore, there are various designs for the fixing position of the sealing body 32 on the bracket 31, such as fixing the sealing body 32 to the surface of the bracket 31 facing away from the inside of the outer shell 1; fixing the sealing body 32 to the wall of the second through hole 311; or fixing the sealing body 32 to the surface of the bracket 31 facing away from the second through hole 311, etc.

[0073] When the battery cell 10 is filled with electrolyte or baked to release gas, a force can be applied to the sealing body 32 toward the inside of the outer casing 1, causing the sealing body 32 to be stretched in the second through hole 311, thereby separating the sealing body 32 from the support 31 and thus connecting the inside of the outer casing 1 with the outside. When the force applied to the sealing body 32 is released, the sealing body 32 can elastically re-abut against the support 31 to isolate the connection between the inside of the outer casing 1 and the outside. Here, the outside refers to the exterior of the battery cell 10.

[0074] It should be noted that when the sealing body 32 is at least partially separated from the support 31 under force, a flow port can be formed between the sealing body 32 and the support 31. In some examples, when the sealing body 32 is subjected to a force toward the inside of the outer casing 1, one end of the sealing body 32 separates from the end of the second through hole 311 near the inside of the outer casing 1, so that the inside of the outer casing 1 communicates with the outside. There are several ways to achieve communication between the inside of the outer casing 1 and the outside, such as: the inside of the outer casing 1 and the outside are maintained through the flow port and the gap between the sealing body 32 and the wall of the second through hole 311; or, the inside of the outer casing 1 and the outside are maintained through the flow port and the inside of the sealing body 32, in which case the sealing body 32 is a hollow structure and its side has an opening for the flow port. Of course, when the sealing body 32 is at least partially separated from the support 31, the communication between the inside of the outer casing 1 and the outside can also be maintained using both of the above methods.

[0075] When the sealing body 32 is sealed in the second through hole 311, as the gas pressure increases, this pressure allows the support 31 and the sealing body 32 to overcome the force between themselves and the wall of the first through hole 13, and undergo structural deformation, allowing the entire structure of the sealing assembly 3 to be discharged from the first through hole 13 and out of the outer casing 1. At this time, the interior of the battery cell 10 remains connected to the outside, and the gas is discharged from the battery cell 10, achieving effective pressure relief. It should be explained that under the pressure inside the battery cell 10, the sealing assembly 3 is squeezed into the first through hole 13. As the pressure increases to the injection threshold, the sealing assembly 3 overcomes the force between itself and the support 31, and its radial deformation increases along the first through hole 13, allowing it to pass through the first through hole 13 and be discharged from the outer casing 1. Since the sealing assembly 3 can also achieve pressure relief and explosion-proof function, traditional explosion-proof valves, sealing aluminum nails, and other components can be eliminated, saving equipment costs. The injection threshold refers to the pressure value at which the sealing component 3 can be discharged from the first through-hole 13. The range of this injection threshold can be determined according to actual needs. For example, the injection threshold can be controlled to be less than or equal to the internal pressure value of the battery cell 10 when thermal runaway occurs. Furthermore, in this embodiment, the sealing component 3 is discharged from the first through-hole 13 during pressure relief, thus maintaining its structural integrity, allowing for repeated use, and resulting in low overall cost.

[0076] It should also be noted that the force between the sealing component 3 and the wall of the first through hole 13 includes not only the mutual resistance force between the sealing component 3 and the outer casing 1 along the length of the first through hole 13, but also the frictional force between them. When the sealing component 3 is subjected to pressure from inside the battery cell 10, the sealing component 3 maintains relative structural stability under the action of the resistance force and frictional force of the outer casing 1; as the gas pressure of the battery cell 10 increases, the pressure on the sealing component 3 increases. When the pressure increases to a level that allows the sealing component 3 to overcome the resistance force and frictional force between it and the outer casing 1, the sealing component 3 moves and deforms relative to the outer casing 1, causing the sealing component 3 to be discharged from the first through hole 13.

[0077] This design achieves both explosion protection and stable venting and liquid injection, reducing battery production costs.

[0078] According to some embodiments of this application, referring to FIG5, the sealing body 32 includes a covering 321 and a sealing member 322; the covering 321 is disposed on the surface of the bracket 31 facing the outside of the outer shell 1, and is at least partially located in the second through hole 311 and connected to the sealing member 322; the sealing member 322 seals against one end of the second through hole 311 facing the inside of the outer shell 1, and is at least partially separated from the end of the second through hole 311 when subjected to a force facing the inside of the outer shell 1.

[0079] The covering 321 refers to the portion of the sealing body 32 located on the surface of the bracket 31 facing the outside of the outer shell 1. When the covering 321 is disposed on the surface of the bracket 31 facing the outside of the outer shell 1, a force can be applied to the sealing member 322 along the direction of the outside of the outer shell 1, so that the sealing member 322 tightly abuts against the end of the second through hole 311 facing the inside of the outer shell 1, thereby achieving pre-compression force and improving the airtightness of the battery cell 10. To achieve the pulling force on the sealing member 322 along the direction of the outside of the outer shell 1, the covering 321 can be fixed to the surface of the bracket 31 facing the outside of the outer shell 1, such as by snap-fitting, welding, or bonding. The covering 321 can also be indirectly fixed to the surface of the bracket 31 facing away from the second through hole 311, for example, the sealing body 32 also includes an edge portion 32f, which surrounds the edge of the covering 321 and is sandwiched between the bracket 31 and the wall of the first through hole 13.

[0080] During liquid injection or venting operations, a force can be applied to the seal 322 toward the interior of the outer casing 1, causing the seal 322 to be pressed and separated from the end of the second through hole 311 facing the interior of the outer casing 1. At this time, a flow port is formed between the seal 322 and the end of the second through hole 311, connecting the interior of the outer casing 1 with the outside, thereby completing the liquid injection or venting operation. There are several ways to achieve communication between the interior of the outer casing 1 and the outside after the seal 322 is separated from the end of the second through hole 311. For example, the portion of the covering 321 located in the second through hole 311 may maintain a gap with the wall of the second through hole 311 to connect the interior of the outer casing 1 with the outside; or, the portion of the covering 321 located in the second through hole 311 may be a hollow structure with an opening on its side.

[0081] With this design, the cover 321 and the seal 322 are introduced. The cover 321 can apply a force to the seal 322 toward the outside of the outer casing 1, so that the seal 322 tightly abuts against one end of the second through hole 311, thereby achieving pre-compression force and improving the airtightness of the battery cell 10.

[0082] According to some embodiments of this application, referring to FIG5, the cover 321 includes a cover portion 32a and an elastic connecting portion 32b connected to the cover portion 32a. The cover portion 32a is disposed on the surface of the bracket 31 facing the outside of the outer shell 1, and the elastic connecting portion 32b is disposed in the second through hole 311 and connected to the seal 322.

[0083] Therefore, the covering portion 32a, through the elastic connecting portion 32b, applies a force to the sealing member 322 towards the outside of the outer casing 1, causing the sealing member 322 to tightly abut against one end of the second through hole 311, thus achieving an effective seal. When liquid injection or venting is required, pressure can be applied to the sealing member 322, stretching the elastic connecting portion 32b and causing it to elastically deform along the length direction of the second through hole 311, thereby separating the sealing member 322 from one end of the second through hole 311.

[0084] The covering portion 32a and the elastic connecting portion 32b can be designed as an integrated structure, and the material can be a material with a certain degree of elasticity, such as, but not limited to, rubber. The covering portion 32a can be fixed to the surface of the bracket 31 facing the outside of the outer shell 1; or it can be fixed to the surface of the bracket 31 facing away from the second through hole 311. In some examples, the covering member 321 also includes an edge portion 32f, which is located on the edge of the covering portion 32a away from the elastic connecting portion 32b, and is sandwiched between the bracket 31 and the wall of the first through hole 13.

[0085] Furthermore, the elastic connection portion 32b can be designed as a strip structure, connecting the covering portion 32a and the sealing member 322, thus creating a gap between the elastic connection portion 32b and the wall of the second through hole 311, allowing the electrolyte or gas to flow through. Of course, the number of elastic connection portions 32b, as strip structures, can be one or more; all elastic connection portions 32b are distributed circumferentially along the second through hole 311. In this case, when the first sealing member 322 separates from one end of the second through hole 311, the medium enters the second through hole 311 from one end and flows out through the gap between the elastic connection portion 32b and the wall of the second through hole 311; or, it flows out through the gap between two adjacent elastic connection portions 32b, where the medium can be an electrolyte or a gas.

[0086] The elastic connection 32b can also be designed as a ring structure, which is connected between the elastic connection 32b and the seal 322. The side of the ring structure is provided with an opening. When the first seal 322 is separated from one end of the second through hole 311, the medium can flow from one end of the second through hole 311 through the interior of the elastic connection 32b and the opening in sequence; or, it can flow through the opening and the interior of the elastic connection 32b in sequence to flow out of the other end of the second through hole 311.

[0087] This design, with the covering part 321 consisting of a covering part 32a and an elastic connecting part 32b, facilitates the connection between the covering part 321 and the sealing part 322, so that the covering part 321 can stably apply a lifting force to the sealing part 322, thereby making the sealing part 322 tightly abut against one end of the second through hole 311, achieving effective water isolation.

[0088] According to some embodiments of this application, referring to FIG5, the elastic connection portion 32b is provided with a channel hole 323, which is configured to connect the interior of the outer casing 1 with the outside when the seal 322 is separated from the second through hole 311.

[0089] After the seal 322 separates from one end of the second through hole 311, the interior of the outer shell 1 remains connected to the outside through the channel hole 323 to stably complete the liquid injection or baking venting operation. The channel hole 323 refers to a hole-like structure provided on the elastic connecting part 32b. Its specific shape can be designed in various ways, as long as it satisfies the requirement that the interior of the outer shell 1 remains connected to the outside after the seal 322 separates from one end of the second through hole 311. For example, one end of the channel hole 323 may be located on the inner wall of the elastic connecting part 32b facing the wall of the second channel hole 323, and the other end may extend to the end face of the elastic connecting part 32b near the covering part 321; or, the elastic connecting part 32b may be a hollow structure, with the channel hole 323 penetrating through and located on the inner wall of the elastic connecting part 32b facing the wall of the second channel hole 323.

[0090] During the injection or venting process, after the seal 322 is separated from one end of the second through hole 311 by force, the channel hole 323 can be located in the second through hole 311 or partially protrude from the second through hole 311. When the channel hole 323 is still located in the second through hole 311, a certain gap must be maintained between the elastic connecting part 32b and the hole wall of the second through hole 311 so that after the seal 322 and the second through hole 311 are separated, the interior of the outer shell 1 remains in communication with the outside through the channel hole 323.

[0091] In addition, the number of channel holes 323 can be one or more. For example, multiple channel holes 323 can be distributed at intervals along the circumference of the elastic connection portion 32b, making the liquid injection or venting more uniform.

[0092] This design introduces a channel hole 323, which allows the outer shell 1 to be connected to the outside after the seal 322 and the second through hole 311 are separated, thus enabling effective liquid injection or venting.

[0093] According to some embodiments of this application, referring to Figures 5 and 6, the elastic connection portion 32b is constructed as an annular structure and surrounds the seal 322 to form a flow channel 3b1 communicating with the outside. The channel hole 323 is provided on the inner wall of the elastic connection portion 32b facing the flow channel 3b1, and when the seal 322 is separated from the second through hole 311, it is at least partially located outside the end of the second through hole 311 facing the inside of the outer casing 1.

[0094] It is understood that the elastic connecting part 32b is a hollow structure, which, together with the sealing member 322, forms a flow channel 3b1. One end of the flow channel 3b1 is sealed by the sealing member 322; the other end is connected to the covering part 32a and communicates with the outside. That is, the covering part 32a surrounds the outer periphery of the elastic connecting part 32b and is connected to one end of the elastic connecting part 32b. At this time, when the sealing member 322 is subjected to force and separates from the second through hole 311, the channel hole 323 extends at least partially out of the second through hole 311. Thus, during the liquid injection process, the electrolyte can enter the interior of the flow channel 3b1 from one end of the flow channel 3b1 and flow into the interior of the outer shell 1 from the channel hole 323; during the baking and venting process, the gas flows into the flow channel 3b1 from the channel hole 323 extending out of the second through hole 311, and then flows to the outside from one end of the flow channel 3b1. In some examples, the covering part 32a, the elastic connecting part 32b, and the sealing member 322 are an integrated structure.

[0095] It should be noted that when the seal 322 is subjected to force and separates from one end of the second through hole 311, the elastic connection part 32b is also subjected to force and stretched, causing the channel hole 323 to undergo structural deformation along the direction of force application, such as the length direction of the second through hole 311, thereby causing the dimension of the channel hole 323 to be elongated along the direction of force application, and thus causing a part of the channel hole 323 to be located outside the second through hole 311.

[0096] This design incorporates the elastic connecting part 32b into a ring-shaped hollow structure, allowing the outer shell 1 to remain connected to the outside world through the channel hole 323 and the flow channel 3b1, thereby enabling effective liquid injection and baking venting operations.

[0097] According to some embodiments of this application, referring to FIG4, the channel hole 323 includes a plurality of channels, and at least some of the channel holes 323 are arranged at circumferential intervals along the elastic connection portion 32b.

[0098] In all the channel holes 323, all the channel holes 323 can be distributed at intervals along the circumference of the elastic connection portion 32b; or a portion can be distributed at intervals along the circumference of the elastic connection portion 32b, and the other portion can be other, such as: distributed at intervals along the length direction of the elastic connection portion 32b, etc.

[0099] With this design, multiple channel holes 323 are introduced circumferentially in the elastic connection part 32b. During the electrolyte injection process, the electrolyte can enter the interior of the outer casing 1 through different channel holes 323, which not only makes the electrolyte enter evenly, but also reduces the buffering force of the electrolyte entering the outer casing 1, thus achieving stable electrolyte injection. At the same time, during baking and venting, the gas can be discharged from the battery cell 10 through different channel holes 323, which helps to improve the venting effect.

[0100] According to some embodiments of this application, referring to FIG5, the sealing member 322 includes a main body portion 32c and a surrounding portion 32d. The surrounding portion 32d is connected to the circumference of the main body portion 32c and partially covers the main body portion 32c. The surrounding portion 32d is connected to the covering member 321. The main body portion 32c abuts against one end of the second through hole 311. The surrounding portion 32d seals between the main body portion 32c and one end of the second through hole 311.

[0101] The main body 32c refers to the structure on the seal 322 that seals one end of the second through hole 311. Its size is usually larger than the size of one end of the second through hole 311. The surrounding part 32d refers to the structure sandwiched between the seal 322 and one end of the second through hole 311, so that the main body 32c and the second through hole 311 are sealed together.

[0102] When sealing the second through hole 311, the main body 32c and the surrounding edge 32d can be pushed out of the second through hole 311 together, and the covering 321 is in a stretched state. At this time, the covering 321 pulls on the surrounding edge 32d, so that the main body 32c and the surrounding edge 32d abut against one end of the second through hole 311, and achieve effective sealing assembly.

[0103] In some examples, the cover 321 includes a cover portion 32a and an elastic connecting portion 32b connected to the cover portion 32a. The elastic connecting portion 32b is configured as a ring structure, and one end of the elastic connecting portion 32b away from the cover portion 32a is connected to the edge portion 32d.

[0104] This design, in which the seal 322 is designed as a main body 32c and a surrounding edge 32d, ensures that when sealing the second through hole 311, the surrounding edge 32d is sandwiched between the second through hole 311 and the main body 32c, thereby improving the sealing effect.

[0105] According to some embodiments of this application, please refer to FIG7. The main body 32c has a groove 32e on the side facing away from the inner surface of the outer shell 1, and the surrounding edge 32d surrounds the outer periphery of the groove 32e. The groove 32e is used for the insertion of the force-applying member 35.

[0106] It can be seen that during the liquid injection or venting process, one end of the force-applying member 35 can be inserted into the groove 32e, and force can be applied to the main body 32c through the force-applying member 35 to squeeze the main body 32c, so that the main body 32c and the surrounding edge 32d are separated together and one end of the second through hole 311 to connect the inside of the outer shell 1 with the outside.

[0107] Meanwhile, a groove 32e is provided on the side of the main body 32c facing away from the interior of the outer shell 1. This reduces the structural strength of the main body 32c and facilitates radial shrinkage deformation of the main body 32c during assembly, making it easier for it and the surrounding edge 32d to pass through the second through hole 311 and abut against one end of the second through hole 311. The shape of the groove 32e can be designed in various ways, such as square, circular, or elliptical openings.

[0108] Furthermore, the force-applying component 35 refers to a structure that can be inserted into the groove 32e and transmit compressive force to the main body 32c. Its material can be of various types, such as, but not limited to, plastic, ceramic, and wood. Of course, a flow channel 351 can also be provided on the force-applying component 35. When the force-applying component 35 squeezes open the seal 322, the electrolyte can flow along the flow channel 351 into the second through hole 311, and finally enter the interior of the outer casing 1 through the gap between the seal 322 and the second through hole 311. The structure of the flow channel 351 can have various designs, such as: the flow channel 351 is located on the outer surface 313 of the force-applying component 35 and extends along the length of the force-applying component 35; or, the flow channel 351 is located inside the force-applying component 35, with one end penetrating through the outer surface 313 of the force-applying component 35, etc.

[0109] In some examples, referring to Figure 7, the covering 321 includes a covering portion 32a and an elastic connecting portion 32b connected to the covering portion 32a. The elastic connecting portion 32b is constructed as a ring structure. One end of the elastic connecting portion 32b away from the covering portion 32a is connected to the surrounding edge portion 32d, and the elastic connecting portion 32b and the main body portion 32c enclose a flow channel 3b1. The elastic connecting portion 32b is provided with a channel hole 323 communicating with the flow channel 3b1. Thus, during liquid injection or venting, the force-applying member 35 can be inserted into the flow channel 3b1 and inserted into the groove 32e. When the sealing member 322 separates from one end of the second through hole 311, the electrolyte can flow into the flow channel 3b1 along the force-applying member 35 and enter the interior of the outer casing 1 through the channel hole 323. Of course, the gas generated during baking can also flow through the channel hole 323, the flow channel 3b1, and the force-applying member 35 in sequence and be discharged to the outside.

[0110] This design introduces a groove 32e, which facilitates the force-applying component 35 to apply stable pressure to the main body 32c, enabling stable liquid injection or venting. At the same time, it also reduces the structural strength of the main body 32c, making it easier for the main body 32c and the surrounding edge 32d to pass through the second through hole 311 together, so as to quickly complete the assembly of the seal 322.

[0111] According to some embodiments of this application, referring to FIG8, when the main body 32c is configured to be subjected to a force toward the outside of the housing 1 and allowing the seal 322 to overcome the force between it and the bracket 31, both the main body 32c and the surrounding edge 32d are discharged out of the second through hole 311, and the surrounding edge 32d is flipped from the main body 32c to the side of the main body 32c facing the second through hole 311.

[0112] When the internal pressure of the battery cell 10 increases, such as in the event of thermal runaway, the internal pressure compresses the main body 32c, causing both the main body 32c and the surrounding portion 32d to be discharged from the second through hole 311. The surrounding portion 32d also folds outward from the main body 32c, resulting in the main body 32c, the surrounding portion 32d, and the covering 321 being distributed sequentially along the length of the second through hole 311. Since the sealing member 322 no longer abuts against one end of the second through hole 311, the internal pressure of the battery cell 10 can be discharged outward from the second through hole 311. This achieves pressure relief while reducing the amount and range of electrolyte ejected outward.

[0113] It should be noted that, in the structural design, the force exerted by the seal 322 against the force between it and the bracket 31 is less than or equal to the force exerted between the sealing assembly 3 and the wall of the first through hole 13. That is, the seal 322 exits the second through hole 311 before or simultaneously with the sealing assembly 3 exiting the first through hole 13. For example, in the early stages of thermal runaway, the internal pressure of the battery cell 10 can first cause the seal 322 to exit the second through hole 311; as the internal pressure increases, the sealing assembly 3 is forced to exit the first through hole 13 along with it. Of course, in other embodiments, when the battery cell 10 experiences thermal runaway, the internal pressure increases rapidly, causing the sealing assembly 3 to exit directly from the first through hole 13 before the seal 322 exits the second through hole 311.

[0114] When the edge portion 32d is flipped down from the main body portion 32c, it is located between the main body portion 32c and the covering member 321, and has a ring-shaped structure. One end of the edge portion 32d is connected to the main body portion 32c, and the other end is connected to the covering member 321. In some examples, the covering member 321 includes a covering portion 32a and an elastic connecting portion 32b connected to the covering portion 32a. The elastic connecting portion 32b is constructed as a ring-shaped structure and has a channel hole 323. At this time, the air pressure inside the battery cell 10 can flow into the elastic connecting portion 32b and the edge portion 32d through the second through hole 311, and be discharged outward through the channel hole 323 of the elastic connecting portion 32b.

[0115] Furthermore, since the edge portion 32d can be flipped over on the main body portion 32c, the covering part 321, the edge portion 32d, and the main body portion 32c can be injection molded onto the bracket 31 during the molding of the sealing assembly 3, which simplifies the processing technology. After molding, the sealing assembly 3 can be first fixed in the first through hole 13 of the outer shell 1, and then the main body portion 32c can be pressed towards one end of the second through hole 311, so that the main body portion 32c and the edge portion 32d are extruded from the other end of the second through hole 311, and the edge portion 32d is re-covered on the main body portion 32c, so that the main body portion 32c and the edge portion 32d together abut against one end of the second through hole 311. This design also simplifies the assembly of the sealing assembly 3 and improves assembly efficiency.

[0116] This design allows the sealing component 3 to respond quickly to changes in the internal pressure of the battery cell 10, achieving effective pressure relief. At the same time, it also helps to reduce the amount and range of electrolyte ejected outward, improving the stability of pressure relief.

[0117] According to some embodiments of this application, referring to Figures 6 and 9, the bracket 31 includes a mounting surface 312 that is circumferentially disposed around the second through hole 311 and faces away from the second through hole 311. The sealing body 32 at least partially covers the mounting surface 312. The mounting surface 312 abuts against the hole wall of the first through hole 13, and the sealing body 32 seals between the mounting surface 312 and the hole wall of the first through hole 13.

[0118] Mounting surface 312 refers to the surface of bracket 31 facing the wall of the second through hole 311, which can be an annular curved surface. When mounting surface 312 abuts against the wall of the first through hole 13, a portion of sealing body 32 is sandwiched between mounting surface 312 and the wall of the first through hole 13, so that bracket 31 and the first through hole 13 fit tightly, reducing the possibility of pressure leakage between bracket 31 and the first through hole 13.

[0119] In some examples, referring to Figure 6, the sealing body 32 includes a covering 321 and a sealing element 322. The covering 321 includes a covering portion 32a, an elastic connecting portion 32b, and an edge portion 32f. The covering portion 32a is disposed on the surface of the bracket 31 facing the outside of the housing 1 and is connected to the sealing element 322 through the elastic connecting portion 32b. The edge portion 32f surrounds the edge of the covering 321 and is sandwiched between the mounting surface 312 and the wall of the first through hole 13.

[0120] To increase the bonding force between the bracket 31 and the first through hole 13, the mounting surface 312 and the second through hole 311 can also be designed to be snap-fit. For example, the mounting surface 312 is provided with a groove structure, and the hole wall of the second through hole 311 is snapped into the groove structure; or, the hole wall of the second through hole 311 is provided with a groove structure, and the mounting surface 312 is at least partially snapped into the groove structure.

[0121] This design introduces an installation surface 312, which facilitates the sealing fit of the bracket 31 on the wall of the first through hole 13, so as to complete the sealing assembly of the bracket 31 in the first through hole 13.

[0122] According to some embodiments of this application, please refer to Figures 7 and 9. The mounting surface 312 is provided with a groove 34 that is arranged around the outer periphery of the bracket 31. The sealing body 32 is at least partially covered in the groove 34. The groove wall of the groove 34 is used to abut against the hole wall of the first through hole 13.

[0123] The slot 34 is annularly located around the outer periphery of the bracket 31, indicating that the slot 34 is an annular groove. When the bracket 31 is assembled in the first through hole 13, the wall of the first through hole 13 engages with the slot 34 and abuts against the groove wall of the slot 34, resulting in a tight fit and effective sealing assembly. The cross-sectional shape of the slot 34 can be designed in various ways, such as, but not limited to, semi-circular, trapezoidal, triangular, and square shapes.

[0124] With this design, a slot 34 is provided on the mounting surface 312, which makes the bracket 31 stably connected with the hole wall of the first through hole 13, thereby improving the sealing between the two.

[0125] According to some embodiments of this application, referring to FIG6, the groove wall of the card slot 34 includes a first side wall 341 and a second side wall 342 disposed opposite to each other along the thickness direction X of the bracket 31. The distance D between the first side wall 341 and the second side wall 342 gradually increases from the end of the card slot 34 near the second through hole 311 to the end of the card slot 34 away from the second through hole 311.

[0126] The first sidewall 341 and the second sidewall 342 refer to the two groove walls of the slot 34 along the thickness direction X of the bracket 31, respectively. The distance D between the first sidewall 341 and the second sidewall 342 is smaller as it gets closer to the second through hole 311. When the wall of the first through hole 13 is inserted into the slot 34, as the insertion depth increases, the wall of the first through hole 13 more easily abuts against the first sidewall 341 and the second sidewall 342, achieving a tight fit between the wall of the first through hole 13 and the bracket 31. In this way, while achieving effective sealing assembly, the design of the slot 34 is simplified, making it easier for the wall of the first through hole 13 to abut against the groove wall of the slot 34.

[0127] Meanwhile, the spacing D between the first sidewall 341 and the second sidewall 342 is designed to vary, facilitating the insertion of the hole wall of the first through hole 13 into the predetermined position in the slot 34 under the guidance of the first sidewall 341 and / or the second sidewall 342. This ensures that the fixed position of the bracket 31 in the first through hole 13 remains consistent, which helps improve the stability of the structure. In some examples, both the first sidewall 341 and the second sidewall 342 are inclined, and they are deflected in directions opposite to each other.

[0128] This design makes the distance D between the first sidewall 341 and the second sidewall 342 smaller as it gets closer to the second through hole 311, making it easier for the hole wall of the first through hole 13 to abut against the first sidewall 341 and / or the second sidewall 342. While achieving effective sealing assembly, it simplifies the design of the slot 34, making it easier for the hole wall of the first through hole 13 to abut against the slot wall of the slot 34.

[0129] According to some embodiments of this application, referring to FIG6, the mounting surface 312 includes a guide surface 315, which is located on the side of the slot 34 facing the inside of the housing 1. The guide surface 315 is inclined relative to the thickness direction X of the bracket 31, and the end of the guide surface 315 away from the slot 34 is closer to the second through hole 311 than the end of the guide surface 315 near the slot 34.

[0130] The guide surface 315 is closer to the interior of the outer casing 1 than the slot 34. Therefore, during the assembly of the bracket 31, the guide surface 315 contacts the wall of the first through hole 13 preferentially compared to the slot 34. Because the guide surface 315 is inclined, it guides the bracket 31 more easily into the first through hole 13, allowing the wall of the first through hole 13 to slide into the slot 34.

[0131] To ensure that the bracket 31 is guided in all directions during assembly, the guide surface 315 can be arranged in a ring around the circumference of the bracket 31.

[0132] This design introduces an inclined guide surface 315, and the guide bracket 31 is inserted into the first through hole 13, so that the hole wall of the first through hole 13 can be more smoothly inserted into the slot 34, thereby improving the assembly efficiency of the sealing component 3.

[0133] According to some embodiments of this application, please refer to FIG9, the bracket 31 is provided with a deformation channel 33 extending to the mounting surface 312. The deformation channel 33 communicates with the second through hole 311 and penetrates the bracket 31 along the thickness direction X of the bracket 31.

[0134] The deformation channel 33 communicates with the second through hole 311 and extends through the support 31 along its thickness direction X. This indicates that the support 31 is in a disconnected state at the deformation channel 33. That is, when the support 31 is subjected to radial compression, it will contract at the deformation channel 33, reducing its overall size and facilitating its effective engagement within the wall of the first through hole 13. After the wall of the first through hole 13 engages with the slot 34, the support 31 rebounds due to reduced force, causing the wall of the first through hole 13 to abut tightly against the wall of the slot 34.

[0135] This design introduces a deformation channel 33, which allows the bracket 31 to elastically contract at the deformation channel 33, reducing its overall size and making it easier to fit into the first through hole 13, thereby further improving the assembly efficiency of the sealing component 3.

[0136] According to some embodiments of this application, referring to FIG9, the deformation channel 33 includes a first channel segment 331 and a second channel segment 332 that are interconnected. The first channel segment 331 is connected to the second through hole 311. The end of the second channel segment 332 away from the first channel segment 331 extends to the mounting surface 312. The dimension L2 of the second channel segment 332 along the circumference of the bracket 31 is greater than the dimension L1 of the first channel segment 331 along the circumference of the bracket 31.

[0137] It can be seen that the first channel segment 331 is distributed closer to the second through hole 311 than the second channel segment 332, that is, the first channel segment 331 and the second channel segment 332 are distributed sequentially in the radial direction of the bracket 31. Since the deformation of the bracket 31 during the insertion into the first through hole 13 is greater the further away from the second through hole 311, the size L2 of the second channel segment 332 is made larger than the size L1 of the first channel segment 331 to meet the deformation requirements at the edge of the bracket 31, so that the bracket 31 can be stably inserted into the first through hole 13.

[0138] It should be noted that, in the radial direction of the bracket 31, the bracket 31 may consist only of the first channel segment 331 and the second channel segment 332; or at least one third channel segment may be provided between the first channel segment 331 and the second channel segment 332, and the size of each third channel segment between the first channel segment 331 and the second channel segment 332 may increase sequentially from the first channel segment 331 to the second channel segment 332.

[0139] This design introduces first channel segment 331 and second channel segment 332 of different sizes, which increases the deformation of the bracket 31 in its radial direction, thereby better adapting to the deformation of the bracket 31 when it is inserted into the first through hole 13, and thus making the bracket 31 stably fixed in the first through hole 13.

[0140] According to some embodiments of this application, referring to FIG10, the second channel segment 332 includes a first channel portion 33a and a second channel portion 33b that are sequentially connected along the thickness direction X of the support 31. The first channel portion 33a and the second channel portion 33b are offset along the circumferential direction of the support 31. A first protrusion 33c protruding toward the second channel portion 33b is formed on the side of the first channel portion 33a along the thickness direction X of the support 31 and toward the side of the second channel portion 33b. A second protrusion 33d protruding toward the first channel portion 33a is formed on the side of the second channel portion 33b along the thickness direction X of the support 31 and toward the side of the first channel portion 33a. The first protrusion 33c and the second protrusion 33d are distributed at intervals along the thickness direction X of the support 31.

[0141] It should be noted that the first channel portion 33a and the second channel portion 33b are misaligned along the circumference of the support 31, indicating that the projections of the first channel portion 33a along the thickness direction X of the support 31 and the second channel portion 33b along the thickness direction X of the support 31 are at least partially misaligned along the circumference of the support 31. For ease of understanding, Figure 10 is used as an example. The two ends of the first channel portion 33a along the circumference of the support 31 include a first end a1 and a second end a2. The two ends of the second channel portion 33b along the circumference of the support 31 include a third end b1 and a fourth end b2. The projection of the second end a2 along the thickness direction X of the support 31 is located between the third end b1 and the fourth end b2, and the projection of the third end b1 along the thickness direction X of the support 31 is located between the first end a1 and the second end a2.

[0142] Because the first channel portion 33a and the second channel portion 33b are misaligned along the circumference of the support 31, the connecting structure formed by the first channel portion 33a and the second channel portion 33b is a non-linear straight-through structure. A protruding structure, namely a first protrusion 33c and a second protrusion 33d, is formed at the junction between the first channel portion 33a and the second channel portion 33b. Thus, when sealing the battery cell 10 with a water barrier, some gas cannot directly enter the first channel portion 33a due to the obstruction of the first protrusion 33c; similarly, at least some gas entering the second channel portion 33b cannot directly enter the first channel portion 33a due to the obstruction of the second protrusion 33d. This increases the flow resistance in the second channel section 332, reduces the probability of the seal 32 bulging due to gas entering the second channel section 332, and improves the reliability of the water barrier sealing of the battery cell 10.

[0143] In this embodiment, the second channel segment 332 is larger than the first channel segment 331. Therefore, when sealing the battery cell 10, gas can more easily enter the second channel segment 332, increasing the pressure on the sealing body 32. To address this, the second channel segment 332 is designed with staggered first channel portion 33a and second channel portion 33b to increase gas flow resistance and reduce the likelihood of the sealing body 32 bulging.

[0144] In some examples, the surface of the first protrusion 33c facing the first channel portion 33a includes a first buffer surface c1, and the surface of the second protrusion 33d facing the second channel portion 33b includes a second buffer surface d1. A buffer channel e1 is formed between the first buffer surface c1 and the second buffer surface d1, and the buffer channel e1 connects the first channel portion 33a and the second channel portion 33b. The first buffer surface c1 and the second buffer surface d1 can have various designs, for example, both the first buffer surface c1 and the second buffer surface d1 can be inclined relative to the thickness direction X of the support 31.

[0145] In addition, during the assembly of the bracket 31, the bracket 31 will undergo shrinkage deformation at the second channel section 332. Since the first protrusion 33c and the second protrusion 33d are distributed at intervals in the thickness direction X, the first protrusion 33c and the second protrusion will be staggered when the bracket 31 shrinks and deforms, and will not directly abut against each other. This allows the bracket 31 to have sufficient shrinkage deformation at the second channel section 332, thereby making the bracket 31 more stably snapped into the first through hole 13.

[0146] This design, which divides the second channel segment 332 into staggered first channel portion 33a and second channel portion 33b, increases the flow resistance in the second channel segment 332 while ensuring the effective shrinkage deformation of the bracket 31 at the second channel segment 332. This reduces the probability of the seal 32 bulging due to gas entering the second channel segment 332, thereby improving the reliability of the water-proof seal of the battery cell 10.

[0147] According to some embodiments of this application, referring to FIG9, the surface of the bracket 31 along its own thickness direction X includes an outer surface 313, which is disposed facing away from the housing 1, and a drainage groove 316 is provided on the outer surface 313 surrounding the outer periphery of the second through hole 311.

[0148] It is known that a drainage groove 316 is provided around the outer periphery of the second through hole 311. In this way, during the electrolyte injection process, the electrolyte remaining on the outer surface 313 will be guided by the drainage groove 316 and collect in the second through hole 311, reducing the electrolyte residue on the surface of the battery cell 10. The shape of the drainage groove 316 can be designed in various ways, as long as it can guide the electrolyte remaining on the outer surface 313 to the second through hole 311.

[0149] This design introduces a drainage groove 316, which allows the electrolyte remaining on the outer surface 313 of the support 31 to converge into the second through hole 311, thereby reducing contamination on the surface of the battery cell 10.

[0150] According to some embodiments of this application, referring to FIG8, a surface of the bracket 31 along its own thickness direction X includes an inner surface 314, the inner surface 314 is disposed facing the inside of the outer shell 1, and the inner surface 314 is arc-shaped arched along the side away from the inside of the outer shell 1.

[0151] The indentation curvature and depth of the inner surface 314 inwards towards the bracket 31 can be adjusted according to actual needs. The inner surface 314 is located on the side of the bracket 31 facing the inside of the outer casing 1, so that one side of the bracket 31 forms a deformable space, which can improve the elastic deformation capability of the bracket 31. When the internal pressure of the battery cell 10 increases, the bracket 31, under the compression of the air pressure, abuts against one end of the first through hole 13. As the air pressure increases, the bracket 31 easily deforms inwards towards the inner surface 314, reducing the radial area of ​​the bracket 31, so that it can pass through the working hole and be discharged from the first through hole 13.

[0152] This design introduces an arc-shaped inner surface 314 on one side of the bracket 31, making it easier for the bracket 31 to deform into the inner surface 314, facilitating the bracket 31 to be discharged from the first through hole 13 and improving the pressure relief effect.

[0153] According to some embodiments of this application, please refer to FIG3. The housing 1 includes a housing 11 and an end cap 12 covering the housing 11. The electrode assembly 2 is housed between the housing 11 and the end cap 12. A first through hole 13 is provided on the end cap 12.

[0154] End cap 12 refers to the component that covers the opening 111 of housing 11 to isolate the internal environment of battery cell 10 from the outside. A first through hole 13 is provided on end cap 12 so that sealing assembly 3 is sealed and assembled on end cap 12. At this time, during liquid injection or baking and venting, pressure can be applied to seal body 32 to separate seal body 32 from end cap 12, so as to connect housing 11 with the outside.

[0155] This design introduces end cap 12 and housing 11 to provide a closed space for electrode assembly 2.

[0156] According to some embodiments of this application, this application provides a battery device 100, which includes a battery cell 10 as described above.

[0157] According to some embodiments of this application, this application provides an electrical device that includes the battery device 100 described above.

[0158] According to some embodiments of this application, referring to Figures 4 and 5, this application provides a sealing assembly 3, which includes a support 31 and a sealing body 32. The support 31 is provided with a second through hole 311; the sealing body 32 includes a covering 321 and a sealing element 322, which are respectively disposed on two surfaces of the support 31 along its own thickness direction X. The sealing element 322 seals against one end of the second through hole 311. The covering 321 is at least partially located in the second through hole 311 and connected to the sealing element 322. The sealing element 322 is configured such that when subjected to a force in the direction from the covering 321 to the sealing element 322, it is at least partially separated from one end of the second through hole 311.

[0159] It should be noted that when the sealing assembly 3 is applied to the outer casing 1 of the battery cell 10, the bracket 31 can be sealed and fitted into the first through hole 13 of the outer casing 1. Since the seal 322 abuts against one end of the second through hole 311, the first through hole 13 of the battery cell 10 is sealed by the sealing assembly 3, achieving effective water isolation. If the seal 322 is separated from one end of the second through hole 311 by force, the interior and exterior of the battery cell 10 can remain in communication, so as to perform liquid injection or baking and venting operations on the battery cell 10.

[0160] In the sealing assembly 3, the bracket 31 serves as a skeleton structure, allowing the sealing body 32 to be assembled in the first through hole 13. When the bracket 31 is sealed and fixed in the first through hole 13, if the second through hole 311 on the bracket 31 is closed by the sealing body 32, the interior and exterior of the outer casing 1 are disconnected, effectively isolating the interior of the outer casing 1 from water. If the second through hole 311 on the bracket 31 is opened, the interior of the outer casing 1 is connected to the exterior, allowing electrolyte to be injected into the outer casing 1; or water vapor inside the outer casing 1 can be discharged to the exterior through the second through hole 311.

[0161] The bracket 31 is sealed and assembled on the wall of the first through hole 13. This not only ensures the stable fixation of the sealing assembly 3 within the first through hole 13, but also improves the seal between the bracket 31 and the wall of the first through hole 13, reducing the possibility of leakage between the bracket 31 and the wall of the first through hole 13 during normal operation of the battery cell 10. The bracket 31 can be sealed and assembled in various ways within the first through hole 13, such as by snap-fitting onto the wall of the first through hole 13, or by interference fit.

[0162] The covering 321 refers to the portion of the sealing body 32 located on the surface of the bracket 31 facing the outside of the outer shell 1. When the covering 321 is disposed on the surface of the bracket 31 facing the outside of the outer shell 1, a force can be applied to the sealing member 322 along the direction of the outside of the outer shell 1, so that the sealing member 322 tightly abuts against the end of the second through hole 311 facing the inside of the outer shell 1, thereby achieving pre-compression force and improving the airtightness of the battery cell 10. To achieve the pulling force on the sealing member 322 along the direction of the outside of the outer shell 1, the covering 321 can be fixed to the surface of the bracket 31 facing the outside of the outer shell 1, such as by snap-fitting, welding, or bonding. The covering 321 can also be indirectly fixed to the surface of the bracket 31 facing away from the second through hole 311, for example, the sealing body 32 also includes an edge portion 32f, which surrounds the edge of the covering 321 and is sandwiched between the bracket 31 and the wall of the first through hole 13.

[0163] During liquid injection or venting operations, a force can be applied to the seal 322 toward the interior of the outer casing 1, causing the seal 322 to be pressed and separated from the end of the second through hole 311 facing the interior of the outer casing 1. At this time, a flow port is formed between the seal 322 and the end of the second through hole 311, connecting the interior of the outer casing 1 with the outside, thereby completing the liquid injection or venting operation. There are several ways to achieve communication between the interior of the outer casing 1 and the outside after the seal 322 is separated from the end of the second through hole 311. For example, the portion of the covering 321 located in the second through hole 311 may maintain a gap with the wall of the second through hole 311 to connect the interior of the outer casing 1 with the outside; or, the portion of the covering 321 located in the second through hole 311 may be a hollow structure with an opening on its side.

[0164] In addition, it should be noted that the technical features of this embodiment can be the same as those in any of the above embodiments.

[0165] With this design, the cover 321 and the seal 322 are introduced. The cover 321 can apply a force to the seal 322 toward the outside of the outer casing 1, so that the seal 322 tightly abuts against one end of the second through hole 311, thereby achieving pre-compression force and improving the airtightness of the battery cell 10.

[0166] According to some embodiments of this application, referring to FIG6, the covering 321 includes a covering portion 32a and an elastic connecting portion 32b connected to the covering portion 32a. The covering portion 32a is disposed on the surface of the support 31 along its own thickness direction X. The elastic connecting portion 32b is disposed in the second through hole 311 and connected to the sealing member 322. The elastic connecting portion 32b is provided with a channel hole 323. The channel hole 323 is configured to connect the two sides of the second through hole 311 along the thickness direction X of the support 31 when the sealing member 322 is separated from the second through hole 311.

[0167] The covering portion 32a applies a force to the sealing member 322 towards the outside of the outer casing 1 through the elastic connecting portion 32b, so that the sealing member 322 tightly abuts against one end of the second through hole 311, achieving an effective seal. When liquid injection or venting is required, pressure can be applied to the sealing member 322 to stretch the elastic connecting portion 32b, causing it to elastically deform along the length direction of the second through hole 311, thereby separating the sealing member 322 from one end of the second through hole 311.

[0168] The covering portion 32a and the elastic connecting portion 32b can be designed as an integrated structure, and the material can be a material with a certain degree of elasticity, such as, but not limited to, rubber. The covering portion 32a can be fixed to the surface of the bracket 31 facing the outside of the outer shell 1; or it can be fixed to the surface of the bracket 31 facing away from the second through hole 311. In some examples, the covering member 321 also includes an edge portion 32f, which is located on the edge of the covering portion 32a away from the elastic connecting portion 32b, and is sandwiched between the bracket 31 and the wall of the first through hole 13.

[0169] After the seal 322 separates from one end of the second through hole 311, the interior of the outer shell 1 remains connected to the outside through the channel hole 323 to stably complete the liquid injection or baking venting operation. The channel hole 323 refers to a hole-like structure provided on the elastic connecting part 32b. Its specific shape can be designed in various ways, as long as it satisfies the requirement that the interior of the outer shell 1 remains connected to the outside after the seal 322 separates from one end of the second through hole 311. For example, one end of the channel hole 323 may be located on the inner wall of the elastic connecting part 32b facing the wall of the second channel hole 323, and the other end may extend to the end face of the elastic connecting part 32b near the covering part 321; or, the elastic connecting part 32b may be a hollow structure, with the channel hole 323 penetrating through and located on the inner wall of the elastic connecting part 32b facing the wall of the second channel hole 323.

[0170] During the injection or venting process, after the seal 322 is separated from one end of the second through hole 311 by force, the channel hole 323 can be located in the second through hole 311 or partially protrude from the second through hole 311. When the channel hole 323 is still located in the second through hole 311, a certain gap must be maintained between the elastic connecting part 32b and the hole wall of the second through hole 311 so that after the seal 322 and the second through hole 311 are separated, the interior of the outer shell 1 remains in communication with the outside through the channel hole 323.

[0171] In addition, the number of channel holes 323 can be one or more. For example, multiple channel holes 323 can be distributed at intervals along the circumference of the elastic connection portion 32b, making the liquid injection or venting more uniform.

[0172] This design introduces a channel hole 323, which allows the outer shell 1 to be connected to the outside after the seal 322 and the second through hole 311 are separated, thus enabling effective liquid injection or venting.

[0173] According to some embodiments of this application, referring to Figures 8 and 9, the bracket 31 includes a mounting surface 312 that is arranged around the outer periphery of the second through hole 311 and faces away from the second through hole 311. The sealing body 32 at least partially covers the mounting surface 312. The bracket 31 is provided with a deformation channel 33 that extends to the mounting surface 312. The deformation channel 33 communicates with the second through hole 311 and penetrates the bracket 31 along the thickness direction X.

[0174] Mounting surface 312 refers to the surface of bracket 31 facing the wall of the second through hole 311, which can be an annular curved surface. When mounting surface 312 abuts against the wall of the first through hole 13, a portion of sealing body 32 is sandwiched between mounting surface 312 and the wall of the first through hole 13, so that bracket 31 and the first through hole 13 fit tightly, reducing the possibility of pressure leakage between bracket 31 and the first through hole 13.

[0175] In some examples, the sealing body 32 includes a cover 321 and a seal 322. The cover 321 includes a covering portion 32a, an elastic connecting portion 32b, and an edge portion 32f. The covering portion 32a is disposed on the surface of the bracket 31 facing the outside of the housing 1 and is connected to the seal 322 through the elastic connecting portion 32b. The edge portion 32f surrounds the edge of the cover 321 and is sandwiched between the mounting surface 312 and the wall of the first through hole 13.

[0176] To increase the bonding force between the bracket 31 and the first through hole 13, the mounting surface 312 and the second through hole 311 can also be designed to be snap-fit. For example, the mounting surface 312 is provided with a groove structure, and the hole wall of the second through hole 311 is snapped into the groove structure; or, the hole wall of the second through hole 311 is provided with a groove structure, and the mounting surface 312 is at least partially snapped into the groove structure.

[0177] This design introduces an installation surface 312, which facilitates the sealing fit of the bracket 31 on the wall of the first through hole 13, so as to complete the sealing assembly of the bracket 31 in the first through hole 13.

[0178] According to some embodiments of this application, referring to FIG7, the sealing component 3 further includes a force-applying member 35, which is at least partially inserted into the second through hole 311 and abuts against the seal 322.

[0179] It can be seen that during the liquid injection or venting process, one end of the force-applying member 35 can be inserted into the second through hole 311 and abut against the seal 322. Force is applied to the seal 322 by the force-applying member 35, so that the seal 322 and one end of the second through hole 311 are separated to connect the inside of the outer shell 1 with the outside.

[0180] The force-applying component 35 refers to the structure that can transmit compressive force to the seal 322. Its material can be of various types, such as, but not limited to, plastic, ceramic, and wood. Of course, a flow channel 351 can also be provided on the force-applying component 35. When the force-applying component 35 compresses and opens the seal 322, the electrolyte can flow along the flow channel 351 into the second through hole 311, and finally enter the interior of the outer casing 1 through the gap between the seal 322 and the second through hole 311. The structure of the flow channel 351 can have various designs, such as: the flow channel 351 is located on the outer surface 313 of the force-applying component 35 and extends along the length of the force-applying component 35; or, the flow channel 351 is located inside the force-applying component 35, with one end penetrating through the outer surface 313 of the force-applying component 35, etc.

[0181] Additionally, it should be noted that during the preparation of the battery cell 10, after the battery cell 10 has completed the baking, venting, and liquid injection processes, the force-applying component 35 can be removed or cut off from the seal 322.

[0182] This design introduces a force-applying component 35, which facilitates stable pressure application to the sealing component 322, ensuring stable liquid injection or venting.

[0183] According to some embodiments of this application, referring to Figures 3 to 10, this application provides a battery cell 10, which includes an end cap 12, a housing 11, an electrode assembly 2, and a sealing assembly 3. The end cap 12 covers the opening 111 of the housing 11, and the electrode assembly 2 is housed between the end cap 12 and the housing 11. The end cap 12 has a first through hole 13, and the sealing assembly 3 is sealed and assembled in the first through hole 13. The sealing assembly 3 includes a bracket 31, a covering 321, and a sealing member 322. The bracket 31 is sealed and snapped onto the wall of the first through hole 13. The bracket 31 has a second through hole 311. The covering 321 is disposed on the surface of the bracket 31 facing away from the housing 11, and a portion of it is located in the second through hole 311. The portion of the covering 321 located in the second through hole 311 has a channel hole 323. The sealing member 322 abuts against the end of the second through hole 311 near the housing 11 and is connected to the covering 321. When the seal 322 is subjected to force and separates from one end of the second through hole 311, the housing 11 communicates with the outside through the channel hole 323. When the battery cell 10 experiences thermal runaway, the sealing assembly 3 is configured to be able to discharge from the first through hole 13.

[0184] 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.

[0185] 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 battery cell, the battery cell comprising: The outer casing (1) has a first through hole (13); Electrode assembly (2) is housed within the outer casing (1); A sealing component is disposed in the first through hole (13); The sealing assembly includes a bracket (31) and a sealing body (32). The bracket (31) is sealed and fitted to the wall of the first through hole (13). The bracket (31) is provided with a second through hole (311). The sealing body (32) is at least partially inserted into the second through hole (311) and is sealed and fitted with the second through hole (311). The sealing body (32) is configured to separate from the bracket (31) at least partially when subjected to a force toward the inside of the housing (1) so that the inside of the housing (1) is connected to the outside. When the sealing assembly is subjected to a force toward the outside of the housing (1) and overcomes the force between the sealing assembly and the wall of the first through hole (13), the sealing assembly can be discharged from the first through hole (13).

2. The battery cell according to claim 1, wherein, The sealing body (32) includes a covering (321) and a sealing element (322); The cover (321) is disposed on the surface of the bracket (31) facing the outside of the outer shell (1), and is at least partially located in the second through hole (311) and connected to the seal (322); the seal (322) seals against one end of the second through hole (311) facing the inside of the outer shell (1), and is at least partially separated from the end of the second through hole (311) when subjected to a force toward the inside of the outer shell (1).

3. The battery cell according to claim 2, wherein, The covering (321) includes a covering part (32a) and an elastic connecting part (32b) connected to the covering part (32a). The covering part (32a) is disposed on the surface of the bracket (31) facing the outside of the outer shell (1). The elastic connecting part (32b) is disposed in the second through hole (311) and connected to the sealing member (322).

4. The battery cell according to claim 3, wherein, The elastic connecting part (32b) is provided with a channel hole (323), which is configured to connect the interior of the outer shell (1) with the outside when the seal (322) is separated from the second through hole (311).

5. The battery cell according to claim 4, wherein, The elastic connecting part (32b) is constructed as an annular structure and surrounds the seal (322) to form a flow channel (3b1) communicating with the outside. The channel hole (323) is provided on the inner wall of the elastic connecting part (32b) facing the flow channel (3b1), and when the seal (322) is separated from the second through hole (311), it is at least partially located outside the end of the second through hole (311) facing the inside of the outer shell (1).

6. The battery cell according to claim 5, wherein, The channel holes (323) include a plurality of holes, and at least a portion of the channel holes (323) are spaced apart circumferentially along the elastic connection portion (32b).

7. The battery cell according to claim 2, wherein, The sealing element (322) includes a main body (32c) and a surrounding edge (32d). The surrounding edge (32d) is connected to the circumference of the main body (32c) and partially covers the main body (32c). The surrounding edge (32d) is connected to the covering element (321). The main body (32c) abuts against one end of the second through hole (311). The surrounding edge (32d) seals between the main body (32c) and one end of the second through hole (311).

8. The battery cell according to claim 7, wherein, The main body (32c) has a groove (32e) on the side facing away from the inner side of the outer shell (1), and the surrounding edge (32d) surrounds the outer periphery of the groove (32e). The groove (32e) is used for the insertion of the force-applying member (35).

9. The battery cell according to claim 7, wherein, When the main body (32c) is configured to be subjected to a force toward the outside of the housing (1) and allowing the seal (322) to overcome the force between it and the bracket (31), both the main body (32c) and the perimeter (32d) are discharged outside the second through hole (311), and the perimeter (32d) is flipped off the main body (32c) to the side of the main body (32c) facing the second through hole (311).

10. The battery cell according to any one of claims 1-9, wherein, The bracket (31) includes a mounting surface (312) circumferentially disposed around the second through hole (311) and facing away from the second through hole (311). The sealing body (32) at least partially covers the mounting surface (312). The mounting surface (312) abuts against the hole wall of the first through hole (13), and the sealing body (32) seals between the mounting surface (312) and the hole wall of the first through hole (13).

11. The battery cell according to claim 10, wherein, The mounting surface (312) is provided with a groove (34) surrounding the outer periphery of the bracket (31), and the sealing body (32) is at least partially covered within the groove (34). The groove wall of the groove (34) is used to abut against the wall of the first through hole (13).

12. The battery cell according to claim 11, wherein, The groove wall of the slot (34) includes a first sidewall (341) and a second sidewall (342) arranged opposite to each other along the thickness direction (X) of the bracket (31), and the distance D between the first sidewall (341) and the second sidewall (342) gradually increases from the end of the slot (34) near the second through hole (311) to the end of the slot (34) away from the second through hole (311).

13. The battery cell according to claim 11, wherein, The mounting surface (312) includes a guide surface (315), which is located on the side of the slot (34) facing the inside of the housing (1). The guide surface (315) is inclined relative to the thickness direction (X) of the bracket (31), and the end of the guide surface (315) away from the slot (34) is closer to the second through hole (311) than the end of the guide surface (315) closer to the slot (34).

14. The battery cell according to claim 10, wherein, The bracket (31) is provided with a deformation channel (33) extending to the mounting surface (312), the deformation channel (33) communicating with the second through hole (311) and penetrating the bracket (31) along the thickness direction (X).

15. The battery cell according to claim 14, wherein, The deformation channel includes a first channel segment (331) and a second channel segment (332) that are interconnected. The first channel segment (331) is connected to the second through hole (311). The end of the second channel segment (332) away from the first channel segment (331) extends to the mounting surface (312). The dimension L2 of the second channel segment (332) along the circumferential direction of the bracket (31) is greater than the dimension L1 of the first channel segment (331) along the circumferential direction of the bracket (31).

16. The battery cell according to claim 15, wherein, The second channel segment (332) includes a first channel portion (33a) and a second channel portion (33b) that are sequentially connected along the thickness direction (X) of the support (31). The first channel portion (33a) and the second channel portion (33b) are circumferentially offset along the support (31). A first protrusion (33c) is formed on the side of the first channel portion (33a) along the thickness direction (X) of the support (31) and facing the second channel portion (33b). A second protrusion (33d) is formed on the side of the second channel portion (33b) along the thickness direction (X) of the support (31) and facing the first channel portion (33a). The first protrusion (33c) and the second protrusion (33d) are distributed at intervals in the thickness direction (X) of the bracket (31).

17. The battery cell according to any one of claims 1-9, wherein, The support (31) includes an outer surface (313) along its thickness direction (X), the outer surface (313) is disposed facing away from the housing (1), and the outer surface (313) is provided with a drainage groove (316) surrounding the outer periphery of the second through hole (311).

18. The battery cell according to any one of claims 1-8, wherein, The bracket (31) includes an inner surface (314) on one surface along its own thickness direction (X), the inner surface (314) being disposed facing the inside of the outer shell (1), and the inner surface (314) being arc-shaped and arched along the side away from the inside of the outer shell (1).

19. The battery cell according to any one of claims 1-9, wherein, The outer casing (1) includes a housing (11) and an end cap (12) covering the housing (11). The electrode assembly (2) is housed between the housing (11) and the end cap (12). The first through hole (13) is provided on the end cap (12).

20. A battery device comprising a battery cell according to any one of claims 1-19.

21. An electrical appliance comprising the battery device of claim 20.

22. A plugging assembly, the plugging assembly comprising: The bracket (31) has a second through hole (311); The sealing body (32) includes a covering (321) and a sealing element (322). The covering (321) and the sealing element (322) are respectively disposed on two surfaces of the bracket (31) along its own thickness direction (X). The sealing element (322) seals against one end of the second through hole (311). The covering (321) is at least partially located in the second through hole (311) and connected to the sealing element (322). The seal (322) is configured to separate at least partially from one end of the second through hole (311) when subjected to a force in the direction from the cover (321) toward the seal (322).

23. The sealing assembly according to claim 22, wherein, The covering (321) includes a covering part (32a) and an elastic connecting part (32b) connected to the covering part (32a). The covering part (32a) is disposed on the surface of the bracket (31) along its own thickness direction (X). The elastic connecting part (32b) is disposed in the second through hole (311) and connected to the sealing member (322). The elastic connecting part (32b) is provided with a channel hole (323). The channel hole (323) is configured to connect the second through hole (311) to both sides of the second through hole (311) along the thickness direction (X) of the bracket (31) when the sealing member (322) is separated from the second through hole (311).

24. The sealing assembly according to claim 22, wherein, The bracket (31) includes a mounting surface (312) surrounding the second through hole (311) and facing away from the second through hole (311). The sealing body (32) at least partially covers the mounting surface (312). The bracket (31) is provided with a deformation channel (33) extending to the mounting surface (312). The deformation channel (33) communicates with the second through hole (311) and penetrates the bracket (31) along the thickness direction (X).

25. The sealing assembly according to any one of claims 22-24, wherein, The sealing assembly further includes a force-applying element (35), which is at least partially inserted into the second through hole (311) and abuts against the seal (322).

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