Sealing assembly, battery monomer, power utilization device and assembling method of sealing assembly

Abstract

The invention relates to a sealing assembly, a battery monomer, a power utilization device and an assembling method of the sealing assembly. The sealing assembly comprises: a substrate having a first through hole; the fixing piece comprises a first fixing part, a second fixing part and a third fixing part, the first fixing part and the third fixing part are arranged on the two opposite sides of the base plate, and at least part of the second fixing part penetrates through the first through hole; the sealing assembly has a first state and a second state; in the first state, in a dummy plane perpendicular to the thickness direction of the substrate, the projection of the third fixing part is completely located in the projection area of the first through hole; in the second state, in the dummy plane perpendicular to the thickness direction of the substrate, the projection part of the third fixing part is located outside the projection area of the first through hole, and the third fixing part abuts against the substrate. According to the sealing assembly, the battery monomer, the power utilization device and the assembly method of the sealing assembly, lithium supplement, electrolyte supplement and pressure reduction can be carried out on the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a sealing assembly, a battery cell, an electrical device, and a method for assembling the sealing assembly. Background Technology

[0002] Taking batteries as an example, during the charging and discharging process of a battery cell, the electrolyte and lithium (such as lithium-ion battery cells) in the battery cell are all lost to a certain extent. In addition, gas is also generated, which can lead to the risk of the battery cell bulging.

[0003] To address the above issues, after a period of battery use, it is necessary to replenish the electrolyte and lithium appropriately, and to periodically vent and depressurize the individual battery cells to extend the battery's lifespan.

[0004] Therefore, designing a method to replenish lithium, replenish electrolyte, and reduce pressure in battery cells has become an urgent problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide an assembly method for a sealed assembly, a battery cell, an electrical device, and a sealed assembly that can replenish lithium, replenish electrolyte, and reduce pressure in a battery cell, in order to address the above problems.

[0006] In a first aspect, this application provides a sealing assembly, the sealing assembly comprising: A substrate having a first through hole extending through its thickness direction; The fastener includes a first fastening portion, a second fastening portion, and a third fastening portion connected in sequence. The first fastening portion and the third fastening portion are disposed on opposite sides of the substrate along the thickness direction of the substrate. The second fastening portion at least partially passes through the first through hole. A sealing element, at least partially located between the first fixing portion and the substrate; The sealing assembly has a first state and a second state. When the sealing assembly is in the first state, the projection of the third fixing part is entirely located within the projection area of ​​the first through hole in a dummy plane perpendicular to the thickness direction of the substrate. When the sealing assembly is in the second state, the projection of the third fixing part is located outside the projection area of ​​the first through hole in a dummy plane perpendicular to the thickness direction of the substrate, and the third fixing part abuts against the substrate. The fixing member rotates relative to the substrate, and the sealing assembly switches between the first state and the second state.

[0007] In some embodiments, the hole wall of the first through hole includes two first hole wall surfaces and two second hole wall surfaces. The two first hole wall surfaces are spaced apart along a first direction, and the two second hole wall surfaces are spaced apart along a second direction. Each second hole wall surface is connected between the two first hole wall surfaces. The length of the third fixing part is greater than the distance between the two second hole wall surfaces and less than the distance between the two first hole wall surfaces. When the sealing assembly is in the second state, in a dummy plane perpendicular to the thickness direction of the substrate, the projection of the third fixing part extends to the opposite sides of the projections of the two second hole walls. The first direction, the second direction, and any two of the substrate thickness direction intersect.

[0008] In some embodiments, both the first hole wall and the second hole wall are flat surfaces.

[0009] In some embodiments, the second hole wall surface includes a first sub-surface, a second sub-surface, and a third sub-surface connected in sequence, wherein the first sub-surface is connected between the second sub-surface and a first hole wall surface, and the third sub-surface is connected between the second sub-surface and another first hole wall surface; The first hole wall, the first sub-surface, and the third sub-surface are all flat surfaces, while the second sub-surface is an arc-shaped surface that is concave relative to the first sub-surface and the third sub-surface.

[0010] In some embodiments, the substrate includes a main body portion and a protrusion portion, the protrusion portion being disposed on one side of the main body portion, and the first through hole penetrating the main body portion and the protrusion portion; the first fixing portion is located on the side of the main body portion away from the protrusion portion; The surface of the protrusion away from the main body includes two fourth sub-surfaces. The two fourth sub-surfaces are centrally symmetrical about the central axis of the first through hole, and the fourth sub-surfaces are connected to the wall surface of the first hole and the wall surface of the second hole. The fourth sub-surface includes a first segment, a second segment, and a third segment arranged sequentially and connected along the rotation direction of the third fixing part. The first segment and the third segment are both planes, and in the thickness direction of the substrate, the third segment is farther away from the sealing member relative to the first segment, and the second segment is an inclined surface. The second segment is used to guide the third fixing part from the first segment to the third segment during the process of the sealing assembly switching from the first state to the second state.

[0011] In some embodiments, the third segment has a first groove, and when the sealing assembly is in the second state, the third fixing portion is partially located within the first groove.

[0012] In some embodiments, the depth of the first groove is L5, where 0.1mm ≤ L5 ≤ 0.5mm.

[0013] In some embodiments, the height difference between the first segment and the third segment is h, where 0.5mm ≤ h ≤ 1.5mm.

[0014] In some embodiments, the substrate includes a main body portion and a protrusion portion, the protrusion portion being disposed on one side of the main body portion, and the first through hole penetrating the main body portion and the protrusion portion; The first fixing part is located on the side of the main body away from the protrusion. When the sealing assembly is in the second state, the third fixing part is located on the side of the protrusion away from the main body.

[0015] In some embodiments, the main body portion is recessed in a direction away from the convex portion to form a recess, the recess having a concave surface and a convex surface disposed opposite to each other, the convex portion being disposed on the concave surface, and the first through hole penetrating the convex surface, the concave surface and the convex portion.

[0016] In some embodiments, the main body portion further includes a straight portion, which is circumferentially disposed around and connected to the recess. The recess includes a first portion, which is parallel to the straight portion and has a first surface on which the protrusion is disposed. The straight portion has a second surface and a third surface disposed opposite to each other. The third surface is disposed close to the first fixing portion, and the second surface is disposed away from the first fixing portion, wherein: The second surface is provided with a second groove, which extends from the inside out through the side periphery of the straight portion; and / or, The recess further includes a second portion, which is circumferentially arranged around the first portion and connects the first portion and the straight portion, and the second portion is inclined relative to the first portion; and / or, In the thickness direction of the substrate, the first surface is located between the second surface and the third surface; and / or, The protrusion has a fourth surface disposed away from the main body, and the distance between the second surface and the fourth surface in the thickness direction of the substrate is H1, where 2mm ≤ H1 ≤ 6mm; and / or, The first portion has a fifth surface away from the protrusion, and the distance between the fifth surface and the fourth surface in the thickness direction of the substrate is H2, where 1mm ≤ H2 ≤ 6mm, and / or, H2 = 2H1; and / or, The first portion has a fifth surface away from the protrusion, and the distance between the fifth surface and the third surface in the thickness direction of the substrate is H3, where 0.5mm≤H3≤3mm.

[0017] In some embodiments, the substrate has a third groove on its surface facing the first fixing portion, and when the sealing assembly is in the second state, at least a portion of the sealing member is embedded in the third groove.

[0018] In some embodiments, in a dummy plane perpendicular to the thickness direction of the substrate, the projection of the first fixing portion falls within the projection area of ​​the outer contour of the seal.

[0019] In some embodiments, the dimension from the central axis of the first through hole to the side periphery of the first fixing part is R1, and the dimension from the central axis of the first through hole to the side periphery of the seal is R2, where 0.7R2≤R1≤0.95R2.

[0020] Secondly, this application provides a battery cell including a housing, an electrode assembly, and a sealing assembly as described in any of the above, wherein the sealing assembly is mounted on the housing and the electrode assembly is disposed within the housing.

[0021] Thirdly, this application provides an electrical device including a battery cell as described in the above embodiments.

[0022] Fourthly, this application provides a method for assembling a sealing assembly, which refers to the sealing assembly described in any of the above embodiments, the method for assembling the sealing assembly comprising: The third fixing part passes through the first through hole on the substrate, so that the first fixing part and the third fixing part are disposed on opposite sides of the substrate along the thickness direction of the substrate, and in a virtual plane perpendicular to the thickness direction of the substrate, the projection of the third fixing part is entirely located within the projection area of ​​the first through hole, so that the sealing assembly is switched to the first state. The first fixing part is pressed against the sealing member and the fixing member is rotated until, in a virtual plane perpendicular to the thickness direction of the substrate, the projection portion of the third fixing part is located outside the projection area of ​​the first through hole, and the third fixing part abuts against the substrate, so that the sealing assembly is switched to the second state.

[0023] Compared with the prior art, this application has the following beneficial effects: The assembly method of the above-mentioned sealing assembly, battery cell, electrical device and sealing assembly, through the cooperation of the substrate, sealing component and fixing component, can repeatedly open or seal the first through hole, so that operations such as liquid injection, lithium replenishment, liquid replenishment and pressure reduction can be repeatedly performed through the first through hole, with high reliability. Attached Figure Description

[0024] Figure 1This is a structural schematic diagram of the sealing assembly in this application during the process of switching from the first state to the second state; Figure 2 for Figure 1 A front view of the sealing assembly shown; Figure 3 An inverted view of the sealing assembly in an embodiment where the two fourth sub-faces 1211 are constructed to form a plane in this application; Figure 4 for Figure 3 The diagram shows the structure of the sealing assembly after the fasteners have been removed. Figure 5 This is a top view of the first through hole in an embodiment where both the first hole wall and the second hole wall are flat surfaces in this application; Figure 6 This is an inverted view of the sealing assembly after the fastener is removed in the embodiment of the fourth sub-face of this application, which includes the first segment, the second segment, and the third segment. Figure 7 This is a top view of the sealing assembly in this application; Figure 8 for Figure 7 The sealing assembly shown is a cross-sectional view along the AA direction; Figure 9 This is a schematic diagram of the sealing assembly in a second state in an embodiment where the two fourth sub-faces 1211 are constructed to form a plane in this application. Figure 10 for Figure 9 A top view of the sealing assembly shown; Figure 11 for Figure 10 The sealing assembly shown is a cross-sectional view along the BB direction; Figure 12 for Figure 9 An inverted view of the sealing assembly shown; Figure 13 This is a schematic diagram of the battery structure in this application; Figure 14 This is a schematic diagram of the electrical device used in this application; Figure 15 This is a flowchart of the assembly method for the sealing component in this application; Figure 16 This is a flowchart illustrating the assembly method of the sealing assembly in an embodiment where both the first and second hole walls are flat surfaces. Figure 17 This is a flowchart illustrating the assembly method of the sealing assembly in the embodiments of the fourth sub-page of this application, which includes the first, second, and third segments.

[0025] Icon labels: 10000, Electrical appliances; 1000, battery; 100. Battery cell; 200. Housing; 210. First part; 220. Second part; 10. Sealing components; 1. Substrate; 2. Fixing component; 3. Sealing component; 11. Main body; 111. Recess; 1111. Concave surface; 1112. Convex surface; 1113. First segment; 11131. First surface; 11132. Fifth surface; 1114. Second segment; 112. Straight segment; 1121. Second surface; 11211. Second groove; 1122. Third surface; 113. Third groove; 12. Convex; 121. Fourth surface; 1211. Fourth sub-surface; 12111. First section; 12112. Second section; 12113. Third section; 12113a. First groove; 13. First through hole; 131. First hole wall; 132. Second hole wall; 1321. First sub-surface; 1322. Second sub-surface; 1323. Third sub-surface; 21. First fixing part; 211. Fourth groove; 22. Second fixing part; 23. Third fixing part; 31. The sixth surface; X1, First direction; X2, Second direction; X3, Third direction; Z1, Substrate thickness direction; M1, Central axis of the first through hole. Detailed Implementation

[0026] 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.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] 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 according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0031] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Taking batteries as an example, during the charging and discharging process of a battery cell, the electrolyte and lithium (such as lithium-ion battery cells) in the battery cell are all lost to a certain extent. In addition, gas is also generated, which can lead to the risk of the battery cell bulging.

[0033] To address the aforementioned issues, after a period of use, it is necessary to replenish the electrolyte and lithium appropriately, and to periodically vent and depressurize the battery cells to extend their lifespan.

[0034] Please see Figures 1 to 3 ,as well as Figures 8 to 12 Based on this, this application provides a sealing assembly 10, which can be used, but is not limited to, for operations such as lithium replenishment, electrolyte replenishment, and pressure reduction. The sealing assembly 10 includes a substrate 1, a fixing member 2, and a sealing member 3. The substrate 1 has a first through hole 13 that is disposed through it along its thickness direction Z1. The fixing member 2 includes a first fixing part 21, a second fixing part 22, and a third fixing part 23 that are connected in sequence. The first fixing part 21 and the third fixing part 23 are disposed on opposite sides of the substrate 1 along the thickness direction Z1 of the substrate 1. The second fixing part 22 is at least partially disposed through the first through hole 13. The sealing member 3 is at least partially located between the first fixing part 21 and the substrate 1. The sealing assembly 10 has a first state and a second state. When the sealing assembly 10 is in the first state, the projection of the third fixing part 23 is entirely located within the projection area of ​​the first through hole 13 in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1. When the sealing assembly 10 is in the second state, the projection of the third fixing part 23 is located outside the projection area of ​​the first through hole 13 in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1, and the third fixing part 23 abuts against the substrate 1. The fixing member 2 rotates relative to the substrate 1, and the sealing assembly 10 switches between the first state and the second state.

[0035] The substrate 1 mainly serves as a mounting and support structure. Optionally, the substrate 1 may be, but is not limited to, a flat plate, an irregular shape, etc. A first through hole 13 is provided on the substrate 1. The first through hole 13 may be used for, but is not limited to, injecting electrolyte (hereinafter referred to as electrolyte injection), replenishing electrolyte (hereinafter referred to as electrolyte replenishment), replenishing lithium, venting and depressurizing, etc.

[0036] The first fixing part 21 and the third fixing part 23 are distributed on opposite sides of the substrate 1. The first fixing part 21 is used to drive the third fixing part 23 to rotate through the second fixing part 22, so that the position of the third fixing part 23 is adjusted, thereby achieving the purpose of switching the sealing assembly 10 between the first state and the second state.

[0037] In this embodiment, the actual assembly steps of the sealing assembly 10 are as follows: the third fixing part 23 is passed through the first through hole 13 on the substrate 1, so that the first fixing part 21 and the third fixing part 23 are disposed on opposite sides of the substrate 1 along the thickness direction Z1 of the substrate 1, and in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection of the third fixing part 23 is entirely located within the projection area of ​​the first through hole 13, so that the sealing assembly 10 is switched to the first state. Then, the first fixing part 21 is pressed against the sealing member 3 and the fixing member 2 is rotated, so that in the dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection of the third fixing part 23 is located outside the projection area of ​​the first through hole 13, and the third fixing part 23 abuts against the substrate 1, so that the sealing assembly 10 is switched to the second state. At this point, the sealing assembly 10 is assembled. In the second state, the third fixing part 23 abuts against the substrate 1, which can limit the fixing member 2 in the thickness direction Z1 of the substrate 1. Moreover, in the second state, the sealing member 3 is located between the first fixing part 21 and the substrate 1, and can seal the gap between the first fixing part 21 and the substrate 1, thereby effectively preventing liquid or gas from leaking to the outside or entering the battery cell 100 from the outside.

[0038] The actual disassembly steps of the sealing assembly 10 are as follows: Rotate the fixing member 2 until the projection of the third fixing part 23 is entirely located within the projection area of ​​the first through hole 13 in a virtual plane perpendicular to the thickness direction Z1 of the substrate 1, so that the sealing assembly 10 is switched to the first state. Then, operate the fixing member 2 to remove it from the first through hole 13, so that the first through hole 13 is opened, thereby facilitating subsequent operations such as liquid injection, liquid replenishment, lithium replenishment, and venting and depressurization using the first through hole 13.

[0039] Therefore, in this application, the first through hole 13 can be repeatedly opened or sealed through the cooperation of the substrate 1, the sealing member 3, and the fixing member 2. This allows for repeated operations such as liquid injection, lithium replenishment, liquid replenishment, and depressurization via the first through hole 13, with high reliability. Moreover, repeated sealing can be achieved through an "insertion-rotation" action, requiring fewer structural components, resulting in a simple structure and easy replacement of each component. Furthermore, the fixing member 2 is threadless, completely eliminating the problem of metal stripping. Therefore, it is not necessary to install an insulating member in the first through hole 13 that mates with the threaded structure to prevent metal stripping, further simplifying the structure of this solution.

[0040] Please see Figures 1 to 5In some embodiments, the hole wall of the first through hole 13 includes two first hole wall surfaces 131 and two second hole wall surfaces 132. The two first hole wall surfaces 131 are spaced apart along a first direction X1, and the two second hole wall surfaces 132 are spaced apart along a second direction X2. Each second hole wall surface 132 is connected between the two first hole wall surfaces 131. The length of the third fixing part 23 is greater than the distance between the two second hole wall surfaces 132 and less than the distance between the two first hole wall surfaces 131. When the sealing assembly 10 is in the second state, in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection of the third fixing part 23 extends to the opposite sides of the projections of the two second hole wall surfaces 132. Any two of the first direction X1, the second direction X2, and the thickness direction Z1 of the substrate 1 intersect.

[0041] The included angle between any two of the thickness direction Z1, the first direction X1, and the second direction X2 of the substrate 1 can be, but is not limited to, 30°, 68°, 90°, 125°, etc. Preferably, the included angle between any two of the thickness direction Z1, the first direction X1, and the second direction X2 of the substrate 1 is 90°, so as to facilitate the positioning of the first hole wall 131 and the second hole wall 132.

[0042] When the sealing assembly 10 is in the first state, the third fixing part 23 extends along the first direction X1; when the sealing assembly 10 is in the second state, the third fixing part 23 extends along the second direction X2, or extends along the third direction X3 that intersects both the first direction X1 and the second direction X2 but is perpendicular to the thickness direction Z1 of the substrate 1.

[0043] In this embodiment, by designing a spacing variation between the two first hole walls 131 and the two second hole walls 132, the fixing member 2 rotates and adjusts its position under the drive of an external driving force. In a virtual plane perpendicular to the thickness direction Z1 of the substrate 1, the projection of the third fixing part 23 can be entirely located within the projection area of ​​the first through hole 13, or the projection part of the third fixing part 23 can be located outside the projection area of ​​the first through hole 13, thereby realizing the state switching of the sealing assembly 10.

[0044] In some embodiments, both the first hole wall 131 and the second hole wall 132 are flat surfaces, thereby forming a rectangular first through hole 13. This design helps to reduce the forming difficulty of the first through hole 13 and improve production efficiency.

[0045] In some embodiments, the second hole wall surface 132 includes a first sub-surface 1321, a second sub-surface 1322, and a third sub-surface 1323 connected in sequence. The first sub-surface 1321 is connected between the second sub-surface 1322 and a first hole wall surface 131, and the third sub-surface 1323 is connected between the second sub-surface 1322 and another first hole wall surface 131. The first hole wall surface 131, the first sub-surface 1321, and the third sub-surface 1323 are all flat surfaces, and the second sub-surface 1322 is an arc-shaped surface that is concave relative to the first sub-surface 1321 and the third sub-surface 1323.

[0046] In this embodiment, when the sealing assembly 10 is in the second state, the third fixing part 23 extends outward from the opposite sides of the two second sub-surfaces 1322 in the second direction X2 or the third direction X3, and abuts against the two second sub-surfaces 1322 in the thickness direction Z1 of the substrate 1. During this process, there are force-bearing positions where the third fixing part 23 interacts with the second sub-surfaces 1322. The force-bearing position where the third fixing part 23 interacts with one of the second sub-surfaces 1322 is defined as the first force-bearing position, and the force-bearing position where the third fixing part 23 interacts with the other second sub-surface 1322 is defined as the second force-bearing position. Since the second sub-surface 1322 is an arc-shaped surface that is concave relative to the first sub-surface 1321 and the third sub-surface 1323, the first force-bearing position and the second force-bearing position are farther apart. The greater the distance between the first and second stress points, the more dispersed the range of force. The bending moment formed by the interaction forces will be evenly distributed on the two second sub-surfaces 1322 and shared, thereby effectively reducing the risk of the third fixing part 23 cracking from the first and second stress points.

[0047] In some embodiments, the width of the first sub-surface 1321 and / or the third sub-surface 1323 in the first direction X1 is L1, 2mm≤L1≤5mm; and / or, the distance between the two first sub-surfaces 1321 and / or the two third sub-surfaces 1323 in the second direction X2 is L2, 1mm≤L2≤3mm; and / or, the maximum width of the second sub-surface 1322 in the first direction X1 is L3, 2mm≤L3≤8mm; and / or, the maximum depth of the second sub-surface 1322 is L4, 1mm≤L4≤5mm.

[0048] Among them, L1 can be, but is not limited to, 2mm, 3mm, 4.1mm, or 5mm; L2 can be, but is not limited to, 1mm, 2.1mm, or 3mm; L3 can be, but is not limited to, 2mm, 3.5mm, 5mm, or 8mm; and L4 can be, but is not limited to, 1mm, 3mm, 4.1mm, or 5mm.

[0049] If the width of the first sub-surface 1321 and / or the third sub-surface 1323 is too small, and / or the spacing between the two first sub-surfaces 1321 and / or the two third sub-surfaces 1323 in the second direction X2 is too small, the cross-sectional area of ​​the first through hole 13 will be too small, thereby increasing the difficulty of installing the fastener 2. If the width of the first sub-surface 1321 and / or the third sub-surface 1323 is too large, and / or the spacing between the two first sub-surfaces 1321 and / or the two third sub-surfaces 1323 in the second direction X2 is too large, the cross-sectional area of ​​the first through hole 13 will be too large, thereby reducing the structural strength of the substrate 1. Based on this, the dimensions are designed to be 2mm≤L1≤5mm and 1mm≤L2≤3mm, so that the first through hole 13 is within a suitable size range, which facilitates the installation of the fastener 2 and maintains the structural strength of the substrate 1.

[0050] The maximum width of the second sub-surface 1322 in the first direction X1 is too small, resulting in a small contact area with the third fixing part 23. This makes it difficult for the second sub-surface 1322 to make stable contact with the third fixing part 23. Conversely, if the maximum width of the second sub-surface 1322 in the first direction X1 is too large, it will increase the difficulty for the third fixing part 23 to seal the first through hole 13 and may also lead to an excessively large cross-sectional area of ​​the first through hole 13, thereby reducing the structural strength of the substrate 1. Therefore, the design is 2mm≤L3≤8mm, making the maximum width of the second sub-surface 1322 in the first direction X1 more suitable. This allows for stable contact with the third fixing part 23 while reducing the difficulty for the third fixing part 23 to seal the first through hole 13, thus improving the structural strength of the substrate 1.

[0051] The deeper the maximum depth of the recess on the second sub-surface 1322, the larger the distance between the two second sub-surfaces 1322, which can easily cause the third fixing part 23 to retract into the first through hole 13 when it rotates slightly relative to the substrate 1. Conversely, the shallower the maximum depth of the recess on the second sub-surface 1322, the closer the distance between the first and second force-bearing positions, making the third fixing part 23 prone to cracking. Therefore, the design is 1mm≤L4≤5mm, so that the maximum depth of the recess on the second sub-surface 1322 is appropriate, which can stably contact the third fixing part 23, improve the sealing effect, and reduce the risk of cracking of the third fixing part 23.

[0052] Please see Figure 2 , Figure 3 and Figure 6 In some embodiments, the substrate 1 includes a main body 11 and a protrusion 12. The protrusion 12 is disposed on one side of the main body 11, and a first through hole 13 passes through the main body 11 and the protrusion 12. A first fixing part 21 is located on the side of the main body 11 away from the protrusion 12. The surface of the protrusion 12 away from the main body 11 includes two fourth sub-surfaces 1211. The two fourth sub-surfaces 1211 are centrally symmetrically arranged about the central axis M1 of the first through hole 13, and the fourth sub-surfaces 1211 are connected to the first hole wall surface 131 and the second hole wall surface 132.

[0053] In this embodiment, when the sealing assembly 10 is in the second state, in the thickness direction Z1 of the substrate 1, the third fixing part 23 is away from the first fixing part 21 relative to the fourth sub-surface 1211, and the third fixing part 23 abuts against the two fourth sub-surfaces 1211. During this process, there are force-bearing areas where the third fixing part 23 interacts with the fourth sub-surfaces 1211. The force-bearing area where the third fixing part 23 interacts with one of the fourth sub-surfaces 1211 is defined as the first force-bearing area, and the force-bearing area where the third fixing part 23 interacts with the other fourth sub-surface 1211 is defined as the second force-bearing area. In the embodiment where the second sub-surface 1322 is an arc-shaped surface concave relative to the first sub-surface 1321 and the third sub-surface 1323, the distance between the first force-bearing area and the second force-bearing area is the distance between the first force-bearing position and the second force-bearing position. In this embodiment, the first force-bearing area and the second force-bearing area are far apart, and the range of force is dispersed, which can effectively reduce the risk of the third fixing part 23 cracking from the first force-bearing area and the second force-bearing area.

[0054] In one embodiment, the two fourth sub-surfaces 1211 are configured to form a plane. In this embodiment, the actual assembly steps of the sealing assembly 10 are as follows: After the sealing assembly 10 is switched to the first state, the first fixing part 21 is pressed against the sealing member 3 using an external driving force, and the third fixing part 23 is spaced apart from the fourth sub-surface 1211. Then, the fixing member 2 is rotated using an external driving force until, in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projected portion of the third fixing part 23 is located outside the projection area of ​​the first through hole 13. Then, the external driving force is released, and the third fixing part 23 abuts against the substrate 1 using the rebound force of the sealing member 3, thereby switching the sealing assembly 10 to the second state. At this point, the assembly of the sealing assembly 10 is complete.

[0055] It is worth mentioning that during the process of switching the sealing assembly 10 to the first state, the fixing member 2 penetrates into the first through hole 13 and squeezes the sealing member 3, so that the sealing member 3 is compressed. When the external driving force is removed, the sealing member 3 will have a certain amount of rebound, and the third fixing part 23 resists the substrate 1 with the rebound force of the sealing member 3. It should be noted that after the external driving force is removed, the sealing member 3 partially rebounds, but it can still achieve the expected compression amount required for sealing.

[0056] In this embodiment, the two fourth sub-surfaces 1211 are constructed to form a plane, which simplifies the structure of the substrate 1 and facilitates molding. Moreover, the fixing member 2 is rotated by external driving force after the third fixing part 23 is spaced apart from the fourth sub-surfaces 1211. This reduces the wear caused by friction between the fixing member 2 and the two fourth sub-surfaces 1211, and extends the service life of the substrate 1 and the fixing member 2.

[0057] In another embodiment, the fourth sub-surface 1211 includes a first segment 12111, a second segment 12112, and a third segment 12113 arranged sequentially and connected along the rotation direction of the third fixing part 23. The first segment 12111 and the third segment 12113 are both planar, and in the thickness direction Z1 of the substrate 1, the third segment 12113 is farther away from the sealing member 3 relative to the first segment 12111, while the second segment 12112 is an inclined surface. The second segment 12112 is used to guide the third fixing part 23 from the first segment 12111 to the third segment 12113 during the process of the sealing assembly 10 switching from the first state to the second state. In this embodiment, the actual assembly steps of the sealing assembly 10 are as follows: After the sealing assembly 10 is switched to the first state, the first fixing part 21 is pressed against the sealing member 3 by an external driving force, and the fixing member 2 is rotated until the third fixing part 23 moves from the first segment 12111 to the third segment 12113 by the guidance of the second segment 12112, and abuts against the third segment 12113. In a virtual plane perpendicular to the thickness direction Z1 of the substrate 1, the projection portion of the third fixing part 23 is located outside the projection area of ​​the first through hole 13, so that the sealing assembly 10 is switched to the second state. At this point, the assembly of the sealing assembly 10 is completed.

[0058] It is worth mentioning that during the process of switching the sealing assembly 10 to the second state, the first segment 12111 is the starting position of the third fixing part 23. At this time, the third fixing part 23 and the first segment 12111 have a small gap in the thickness direction Z1 of the substrate 1. The third segment 12113 is the stopping position of the third fixing part 23. At this time, the third fixing part 23 and the first segment 12111 are in close contact in the thickness direction Z1 of the substrate 1. The second segment 12112 is used to guide and guide the third fixing part 23 from the first segment 12111 to the third segment 12113 during the rotation of the fixing member 2, so as to improve the stability of the rotation of the third fixing part 23. Since the distance between the first fixing part 21 and the third fixing part 23 is fixed, and in the thickness direction Z1 of the substrate 1, the third segment 12113 is farther away from the sealing member 3 relative to the first segment 12111, and the second segment 12112 is an inclined surface, that is, when the sealing assembly 10 switches to the second state, the distance between the fourth sub-surface 1211 and the sealing member 3 increases in the rotation direction of the third fixing part 23. In this way, during the rotation of the third fixing part 23 under the guidance of the second segment 12112, the squeezing action between the first fixing part 21 and the sealing member 3, as well as the squeezing action between the third fixing part 23 and the fourth sub-surface 1211, gradually deepens. This design can increase the sealing effect of the sealing assembly 10 during the switching to the second state and improve the sealing performance. Moreover, the second segment 12112 guides the third fixing part 23 from the first segment 12111 to the third segment 12113, which also improves the rotational stability of the third fixing part 23. Furthermore, after the sealing assembly 10 switches to the second state, the seal 3 will not rebound, allowing the seal 3 to achieve a better compression and a better sealing effect. Further, in some embodiments, the third segment 12113 has a first groove 12113a. When the sealing assembly 10 is in the second state, the third fixing part 23 is partially located within the first groove 12113a. Specifically, the two ends of the third fixing part 23, which are positioned opposite each other along its extension direction, are respectively disposed within the two first grooves 12113a of the two fourth sub-surfaces 1211. The first groove 12113a can limit the third fixing part 23 to prevent it from moving relative to the substrate 1, thereby ensuring a seal is formed between the first fixing part 21, the seal 3, and the substrate 1.

[0059] In some embodiments, the depth of the first groove 12113a is L5, where 0.1mm≤L5≤0.5mm.

[0060] L5 can be, but is not limited to, 0.1mm, 0.2mm, 0.35mm, or 0.5mm.

[0061] In the rotation direction of the third fixing part 23, the depth of the first groove 12113a can remain constant, or gradually deepen or gradually become shallower. Regardless of the form of the first groove 12113a, in the rotation direction of the third fixing part 23, the depth of each position of the first groove 12113a is in the range of 0.1mm to 0.5mm.

[0062] If the depth of the first groove 12113a is too large, it will increase the difficulty for the third fixing part 23 to detach from the first groove 12113a, causing jamming during the transition of the sealing assembly 10 from the second state to the first state. If the depth of the first groove 12113a is too small, its function of limiting the third fixing part 23 is not obvious, making it easy for the third fixing part 23 to detach from the first groove 12113a. Based on this, the depth is designed to be 0.1mm≤L5≤0.5mm. Under this design, the depth of the first groove 12113a is appropriate, which can both limit the third fixing part 23 and facilitate the subsequent unscrewing of the third fixing part 23 from the first groove 12113a, thus facilitating the state transition of the sealing assembly 10.

[0063] In some embodiments, the height difference between the first segment 12111 and the third segment 12113 is h, where 0.5mm ≤ h ≤ 1.5mm.

[0064] If the height difference between the first segment 12111 and the third segment 12113 is too large, the second segment 12112 will have difficulty providing a guiding function, and the third fixing part 23 will easily get stuck during rotation. Furthermore, if the height difference between the first segment 12111 and the third segment 12113 is too large, the seal 3 may be damaged due to excessive compression when the third fixing part 23 rotates from the first segment 12111 to the third segment 12113. If the height difference between the first segment 12111 and the third segment 12113 is too small, although the second segment 12112 will slide smoothly, the compression of the seal 3 may be insufficient when the third fixing part 23 rotates from the first segment 12111 to the third segment 12113, resulting in a poor sealing effect. Therefore, a height difference of 0.5mm ≤ h ≤ 1.5mm is designed. This design improves the reliability of the rotation of the third fixing part 23, enhances the sealing effect of the seal 3, and extends the service life of the seal 3.

[0065] Please see Figures 1 to 3 , Figure 7 , Figure 8 and Figure 11 In some embodiments, the substrate 1 includes a main body 11 and a protrusion 12. The protrusion 12 is disposed on one side of the main body 11, and the first through hole 13 passes through the main body 11 and the protrusion 12. The first fixing part 21 is located on the side of the main body 11 away from the protrusion 12. When the sealing assembly 10 is in the second state, the third fixing part 23 is located on the side of the protrusion 12 away from the main body 11.

[0066] In this design, when the sealing assembly 10 switches to the second state, the projection of the portion of the third fixing part 23 extending beyond the first through hole 13 along the second direction X2 or the third direction X3 in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1 can fall within the projection area of ​​the two fourth sub-surfaces 1211 or the projection area of ​​the main body 11. Therefore, the design in this embodiment effectively avoids the third fixing part 23 interfering with the installation of the substrate 1. Furthermore, the design in this embodiment also ensures that, while the first through hole 13 has a certain depth, substrate 1 material is saved, reducing the manufacturing cost of the sealing assembly 10.

[0067] It is worth mentioning that, in this embodiment, the two first hole wall surfaces 131 and the two second hole wall surfaces 132 can be understood as the inner wall surfaces of the protrusion 12, and the two fourth sub-surfaces 1211 can be understood as the outer end surfaces of the protrusion 12 away from the main body 11.

[0068] In some embodiments, the main body 11 is recessed in a direction away from the protrusion 12 to form a recess 111. The recess 111 has a concave surface 1111 and a convex surface 1112 disposed opposite to each other. The protrusion 12 is disposed on the concave surface 1111, and a first through hole 13 passes through the convex surface 1112, the concave surface 1111, and the protrusion 12. In this way, the first through hole 13 can be accommodated in the recess 111, thereby helping to save the size of the sealing assembly 10 in the thickness direction Z1 of the substrate 1 and improving the space utilization of the sealing assembly 10.

[0069] In some embodiments, the main body 11 further includes a straight portion 112, which is circumferentially disposed around and connected to the recess 111. The recess 111 includes a first portion 1113, which is parallel to the straight portion 112. The first portion 1113 has a first surface 11131 on which the protrusion 12 is provided. The straight portion 112 has a second surface 1121, which is disposed away from the first fixing portion 21. The second surface 1121 has a second groove 11211, which extends from the inside to the outside through the side periphery of the straight portion 112. The second groove 11211 is used to achieve the overlapping function of the mounting reference between the substrate 1 and the mounting base 1, so as to facilitate the positioning of the substrate 1 during the mounting process.

[0070] In some embodiments, the recess 111 further includes a second portion 1114, which is disposed circumferentially around the first portion 1113 and connected between the first portion 1113 and the straight portion 112. The second portion 1114 is disposed at an angle relative to the first portion 1113 so that the first portion 1113 and the straight portion 112 can be connected more smoothly to improve the structural strength of the substrate 1.

[0071] In some embodiments, the straight portion 112 has a third surface 1122, which is disposed opposite to the second surface 1121 and close to the first fixing portion 21. In the thickness direction Z1 of the substrate 1, the first surface 11131 is located between the second surface 1121 and the third surface 1122. In this design, there is dimensional overlap between the first portion 1113 and the straight portion 112 in the thickness direction Z1 of the substrate 1, which helps to reduce the size of the sealing assembly 10 in the thickness direction Z1 of the substrate 1. Furthermore, in this embodiment, the second portion 1114 can smoothly connect the first portion 1113 and the straight portion 112.

[0072] In some embodiments, the protrusion 12 has a fourth surface 121 disposed away from the main body 11, and the distance between the second surface 1121 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is H1, where 2mm≤H1≤6mm.

[0073] H1 can be, but is not limited to, 2mm, 3.3mm, 5mm, or 6mm.

[0074] The fourth surface 121 is formed by the two fourth sub-surfaces 1211 mentioned above. The distance between the second surface 1121 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is the size of the protrusion 12 protruding from the straight portion 112.

[0075] The distance between the second surface 1121 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is too small, and the size of the protrusion 12 protruding from the flat part 112 is too small. If the third fixing part 23 tilts during rotation, it is easy to abut against the flat part 112, causing the rotation of the third fixing part 23 to become stuck. The distance between the second surface 1121 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is too large, and the space occupied by the protrusion 12 in the thickness direction Z1 of the substrate 1 is too large, which will lead to a decrease in space utilization. Based on this, the design is 2mm≤H1≤6mm to balance the smoothness of the rotation of the third fixing part 23 and improve space utilization.

[0076] In some embodiments, the first portion 1113 has a fifth surface 11132 away from the protrusion 12, and the distance between the fifth surface 11132 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is H2, 1mm≤H2≤6mm, and / or, H2=2H1.

[0077] H2 can be, but is not limited to, 1mm, 2mm, 3.3mm, 5mm, or 6mm.

[0078] The distance between the fifth surface 11132 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is the sum of the thicknesses of the first portion 1113 and the protrusion 12. Since the protrusion 12 and the first portion 1113 are subjected to the rebound force generated by the deformation of the seal 3, if the sum of their thicknesses is too small, the overall structural strength of the substrate 1 will be poor; if the sum of their thicknesses is too large, the space occupied by the substrate 1 in its thickness direction Z1 will be too large, leading to a reduction in space utilization. Therefore, the design is 1mm ≤ H2 ≤ 6mm, which can both ensure the structural strength of the substrate 1 and improve space utilization.

[0079] In some embodiments, the first portion 1113 has a fifth surface 11132 away from the protrusion 12, and the distance between the fifth surface 11132 and the third surface 1122 in the thickness direction Z1 of the substrate 1 is H3, 0.5mm≤H3≤3mm. H3 can be, but is not limited to, 0.5mm, 2mm, or 3mm.

[0080] The distance between the fifth surface 11132 and the third surface 1122 in the thickness direction Z1 of the substrate 1 is the height by which the convex surface 1112 of the recess 111 protrudes outward relative to the flat portion 112. If the distance between the fifth surface 11132 and the third surface 1122 in the thickness direction Z1 of the substrate 1 is too small, it means that the height of the convex surface 1112 is small, and the depth of the recess 111 is also shallow. Therefore, when the convex portion 12 is provided on the concave surface 1111 of the recess 111, the dimension protruding outward from the concave surface 1111 will also increase. If the distance between the fifth surface 11132 and the third surface 1122 in the thickness direction Z1 of the substrate 1 is too large, it means that the height of the convex surface 1112 is large, and the space occupied in the thickness direction Z1 of the substrate 1 is also large. Based on this, the design is 0.5mm≤H3≤3mm to improve space utilization.

[0081] Please see Figure 8 In some embodiments, the seal 3 has a sixth surface 31 disposed toward the first fixing part 21, and the distance between the sixth surface 31 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is H4, H4=H1+ρ1, where ρ1 is the thickness of the seal 3 when the sealing assembly 10 is in the second state; and / or, 70%ρ2≤ρ1≤75%ρ2, where ρ2 is the thickness of the seal 3 before compression.

[0082] Specifically, ρ1 can be, but is not limited to, 70%ρ2, 71%ρ2, 73%ρ2, or 75%ρ5.

[0083] The distance between the sixth surface 31 and the fourth surface 121 in the thickness direction Z1 of the substrate 1 is the sum of the thicknesses of the sealing member 3, the recess 111, and the protrusion 12 when the sealing assembly 10 is in the second state. If this sum of thicknesses is too small, the structural strength of the substrate 1 is poor, and the sealing member 3 is too thin, failing to achieve the expected compression required for sealing. If this sum of thicknesses is too large, the space occupied by the sealing member 3, the recess 111, and the protrusion 12 in the thickness direction Z1 of the substrate 1 is too large, leading to a decrease in space utilization. Based on this, H4 is designed as H1 + ρ1, which can both ensure the structural strength of the substrate 1, improve the sealing effect of the sealing member 3, and improve space utilization.

[0084] If ρ1 is too small, the seal 3 cannot achieve the expected compression required for sealing; if ρ1 is too large, the seal 3 occupies too much space in the thickness direction Z1 of the substrate 1, resulting in low space utilization. Therefore, the design is 70%ρ2≤ρ1≤75%ρ2 to improve the sealing effect and space utilization of the seal 3.

[0085] Please see Figure 8 and Figure 11 In some embodiments, a third groove 113 is provided on the surface of the substrate 1 facing the first fixing part 21, and when the sealing assembly 10 is in the second state, at least a portion of the sealing member 3 is embedded in the third groove 113.

[0086] Optionally, the first fixing part 21 is provided with a protrusion on the side facing the seal 3, and the protrusion and the third groove 113 are disposed opposite to each other along the thickness direction Z1 of the substrate 1. Alternatively, the projection of the side periphery of the first fixing part 21 on the thickness direction Z1 of the substrate 1 falls into the third groove 113. During the process of the first fixing part 21 pressing the seal 3, the protrusion or the side periphery of the first fixing part 21 presses the seal 3 into the third groove 113.

[0087] Optionally, the third groove 113 is an annular groove, and the portion of the seal 3 arranged along its circumference is embedded in the third groove 113.

[0088] Embedding at least a portion of the seal 3 into the third groove 113 increases the sealing path and improves the sealing effect. In this case, a good sealing effect is achieved without precisely controlling the compression of the seal 3. Moreover, this design achieves a better sealing effect by simply embedding at least a portion of the seal 3 into the third groove 113, thus obtaining a wider sealing compliance area.

[0089] Furthermore, in some embodiments, the depth of the third groove 113 is T1, 0.2mm≤T1≤0.5mm, and / or the thickness of the substrate 1 is T2, T1≤1 / 3T2.

[0090] T1 can be, but is not limited to, 0.2mm, 0.35mm, or 0.5mm. And / or, T1 can be, but is not limited to, 1 / 5T2, 1 / 4T2, or 1 / 3T2.

[0091] If T1 is too small, the depth of the third groove 113 is too shallow, and the portion of the seal 3 embedded is small, resulting in a mediocre sealing effect. If T1 is too large, the depth of the third groove 113 is too deep, making the seal 3 prone to perforation and damage. Therefore, the design is 0.2mm≤T1≤0.5mm, and / or, T1≤1 / 3T2. This ensures the sealing effect of the seal 3 while also helping to maintain the structural strength of the seal 3 and extend its service life.

[0092] In some embodiments, the projection of the first fixing part 21 falls within the projection area of ​​the outer contour of the sealing member 3 in a dummy plane perpendicular to the thickness direction Z1 of the substrate 1. This design ensures that the sealing member 3 fully seals the gap between the first fixing part 21 and the substrate 1, resulting in a good sealing effect.

[0093] Please see Figure 7 and Figure 8 In some embodiments, both the seal 3 and the first fixing part 21 are circular sheet structures. The dimension from the central axis M1 of the first through hole 13 to the side periphery of the first fixing part 21 is R1, and the dimension from the central axis M1 of the first through hole 13 to the side periphery of the seal 3 is R2, where 0.7R2≤R1≤0.95R2.

[0094] The central axis M1 of the first through hole 13, the central axis of the seal 3, and the central axis of the first fixing part 21 coincide.

[0095] R1 can be, but is not limited to, 0.7R2, 0.75R2, 0.8R2, 0.86R2, or 0.95R2.

[0096] If R1 is too small, its pressure resistance on seal 3 will be insufficient, leading to poor sealing performance. If R1 is too large, the first fixing component 2 will require a large amount of material, resulting in waste. Therefore, the design is 0.7R2≤R1≤0.95R2. This ensures a good sealing effect while saving material.

[0097] Preferably, 0.8R2≤R1≤0.9R2. This setting helps to further improve the sealing effect and save materials.

[0098] In some embodiments, a fourth groove 211 for operating the first fixing part 21 to rotate is provided on the surface of the first fixing part 21 away from the seal 3, so as to facilitate the screwing of the fixing part 2.

[0099] The fourth groove 211 is adapted to the operating tool that rotates the operating fixture 2. The fourth groove 211 can be, but is not limited to, a cross shape, a straight line shape or other shapes.

[0100] Please see Figure 1 and Figure 13 Please refer to the figure. This application also provides a battery cell 100, which includes a housing, an electrode assembly, and a sealing assembly 10 as described in any of the above embodiments. The sealing assembly 10 is mounted on the housing, and the electrode assembly is disposed inside the housing.

[0101] Specifically, the housing has a receiving cavity and an opening communicating with the receiving cavity, the electrode assembly is disposed in the receiving cavity, and the substrate 1 of the sealing assembly 10 covers the opening of the housing to seal the electrode assembly.

[0102] Optionally, the housing includes a base plate and side plates disposed around the base plate, the side plates and the base plate defining a receiving cavity, the end face of the side plate away from the base plate forming an opening of the housing, and the base plate 1 serving as a top plate and sealing the opening. In some other embodiments, one of the side plates and the base plate forms an opening with the top plate, and the base plate 1 serves as the other of the side plate and the base plate.

[0103] Optionally, the housing includes a bottom plate, a side plate, and a top plate. The side plate is connected between the bottom plate and the top plate and is arranged circumferentially around the bottom plate. The bottom plate, the side plate, and the top plate define a receiving cavity. A partial area of ​​one of the bottom plate, the side plate, and the top plate has an opening, and the base plate 1 covers the opening.

[0104] The battery cell 100 in this application has the effects of any of the above embodiments, so it will not be described again here.

[0105] Please see Figure 13 and Figure 14 This application also provides an electrical device 10000, which includes a battery cell 100 as described in the above embodiments.

[0106] Specifically, the electrical device 10000 includes a battery 1000, which includes a housing 200 and a plurality of battery cells 100. The housing 200 includes a first part 210 and a second part 220 that are detachably connected. All battery cells 100 are disposed within the space defined by the first part 210 and the second part 220 and are used to jointly provide electrical energy to the electrical device 10000.

[0107] The electrical device 10000 in this application has the effects of any of the above embodiments, so it will not be described again here.

[0108] The electrical device 10000 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. 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, etc.

[0109] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical device 10000 described above.

[0110] Please see Figure 8 ,、 Figure 11 and Figure 15 This application also provides a method for assembling a sealing assembly 10, which refers to the sealing assembly 10 as described in any of the above embodiments. The method for assembling the sealing assembly 10 includes: Step S100: The third fixing part 23 passes through the first through hole 13 on the substrate 1, so that the first fixing part 21 and the third fixing part 23 are disposed on opposite sides of the substrate 1 along the thickness direction Z1 of the substrate 1, and in the dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection of the third fixing part 23 is entirely located within the projection area of ​​the first through hole 13, so that the sealing assembly 10 is switched to the first state. Step S200: Press the first fixing part 21 against the sealing member 3 and rotate the fixing member 2 until, in the dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection part of the third fixing part 23 is located outside the projection area of ​​the first through hole 13, and the third fixing part 23 abuts against the substrate 1, so that the sealing assembly 10 switches to the second state.

[0111] In this application, steps S100 and S200 work together to repeatedly open or seal the first through hole 13, thereby enabling repeated operations such as liquid injection, lithium replenishment, liquid replenishment and depressurization through the first through hole 13, with high reliability.

[0112] Please see Figure 6 and Figure 16 In one embodiment, the substrate 1 includes a main body 11 and a protrusion 12. The protrusion 12 is disposed on one side of the main body 11, and a first through hole 13 passes through the main body 11 and the protrusion 12. A first fixing part 21 is located on the side of the main body 11 away from the protrusion 12. The surface of the protrusion 12 away from the main body 11 includes two fourth sub-surfaces 1211. The two fourth sub-surfaces 1211 are centrally symmetrically arranged about the central axis M1 of the first through hole 13, and the fourth sub-surfaces 1211 are connected to the first hole wall surface 131 and the second hole wall surface 132. The two fourth sub-surfaces 1211 are configured to form a plane.

[0113] In this embodiment, step S200 includes step S210: pressing the first fixing part 21 against the sealing member 3, and the third fixing part 23 and the fourth sub-surface 1211 are spaced apart, and rotating the fixing member 2 so that in the dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection part of the third fixing part 23 is located outside the projection area of ​​the first through hole 13, and then the third fixing part 23 abuts against the substrate 1 by means of the rebound force of the sealing member 3, so that the sealing assembly 10 switches to the second state.

[0114] During the process of switching the sealing assembly 10 to the first state, the fixing member 2 penetrates into the first through hole 13 and squeezes the sealing member 3, so that the sealing member 3 is compressed. When the external driving force is removed, the sealing member 3 will have a certain rebound, and the third fixing part 23 resists the substrate 1 with the rebound force of the sealing member 3. It should be noted that after the external driving force is removed, the sealing member 3 partially rebounds, but it can still achieve the expected compression amount required for sealing.

[0115] In this embodiment, the fixing part 23 and the fourth sub-surface 1211 are spaced apart and then the fixing part 2 is rotated by external driving force. This can reduce the wear caused by friction between the fixing part 2 and the two fourth sub-surfaces 1211 and extend the service life of the substrate 1 and the fixing part 2.

[0116] In another embodiment, the fourth sub-surface 1211 includes a first segment 12111, a second segment 12112, and a third segment 12113 arranged sequentially and connected along the rotation direction of the third fixing part 23. The first segment 12111 and the third segment 12113 are both planar, and in the thickness direction Z1 of the substrate 1, the third segment 12113 is farther away from the sealing member 3 relative to the first segment 12111, while the second segment 12112 is an inclined surface. The second segment 12112 is used to guide the third fixing part 23 from the first segment 12111 to the third segment 12113 during the process of the sealing assembly 10 switching from the first state to the second state.

[0117] Please see Figure 6 and Figure 17 In this embodiment, step S200 includes step S220: pressing the first fixing part 21 against the sealing member 3 and rotating the fixing member 2 until the third fixing part 23 moves from the first segment 12111 to the third segment 12113 by means of the guiding action of the second segment 12112 and abuts against the third segment 12113. In the dummy plane perpendicular to the thickness direction Z1 of the substrate 1, the projection part of the third fixing part 23 is located outside the projection area of ​​the first through hole 13, so that the sealing assembly 10 switches to the second state.

[0118] In this embodiment, during the switching of the sealing assembly 10 to the second state, the first segment 12111 is the starting position of the third fixing part 23, at which time the third fixing part 23 and the first segment 12111 have a small gap in the thickness direction Z1 of the substrate 1. The third segment 12113 is the stopping position of the third fixing part 23, at which time the third fixing part 23 and the first segment 12111 are in close contact in the thickness direction Z1 of the substrate 1. The second segment 12112 is used to guide and guide the third fixing part 23 from the first segment 12111 to the third segment 12113 during the rotation of the fixing member 2, thereby improving the stability of the rotation of the third fixing part 23. Since the distance between the first fixing part 21 and the third fixing part 23 is constant, and in the thickness direction Z1 of the substrate 1, the third segment 12113 is farther away from the sealing member 3 relative to the first segment 12111, and the second segment 12112 is an inclined surface, that is, when the sealing assembly 10 switches to the second state, the distance between the fourth sub-surface 1211 and the sealing member 3 increases in the rotation direction of the third fixing part 23. In this way, during the rotation of the third fixing part 23 under the guidance of the second segment 12112, the squeezing action between the first fixing part 21 and the sealing member 3, as well as the squeezing action between the third fixing part 23 and the fourth sub-surface 1211, gradually deepens. This design can increase the sealing effect of the sealing assembly 10 during the switching to the second state and improve the sealing performance. Moreover, the second segment 12112 guides the third fixing part 23 from the first segment 12111 to the third segment 12113, which also improves the rotational stability of the third fixing part 23. Furthermore, after the sealing assembly 10 switches to the second state, the seal 3 will not rebound, allowing the seal 3 to achieve a better compression and thus a better sealing effect.

[0119] 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.

[0120] 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 sealing assembly, characterized in that, The sealing assembly includes: The substrate (1) has a first through hole (13) that extends through it along its thickness direction (Z1). The fastener (2) includes a first fastening part (21), a second fastening part (22), and a third fastening part (23) connected in sequence. The first fastening part (21) and the third fastening part (23) are disposed on opposite sides of the substrate (1) along the thickness direction (Z1) of the substrate (1). The second fastening part (22) is at least partially inserted through the first through hole (13). The sealing element (3) is at least partially located between the first fixing part (21) and the substrate (1); The sealing assembly has a first state and a second state. When the sealing assembly is in the first state, the projection of the third fixing part (23) is entirely located within the projection area of ​​the first through hole (13) in a dummy plane perpendicular to the thickness direction (Z1) of the substrate (1). When the sealing assembly is in the second state, the projection of the third fixing part (23) is located outside the projection area of ​​the first through hole (13) in a dummy plane perpendicular to the thickness direction (Z1) of the substrate (1), and the third fixing part (23) abuts against the substrate (1). The fixing member (2) rotates relative to the substrate (1), and the sealing assembly switches between the first state and the second state.

2. The sealing assembly according to claim 1, characterized in that, The hole wall of the first through hole (13) includes two first hole wall surfaces (131) and two second hole wall surfaces (132). The two first hole wall surfaces (131) are spaced apart along a first direction (X1), and the two second hole wall surfaces (132) are spaced apart along a second direction (X2). Each second hole wall surface (132) is connected between the two first hole wall surfaces (131). The length of the third fixing part (23) is greater than the distance between the two second hole wall surfaces (132) and less than the distance between the two first hole wall surfaces (131). When the sealing assembly is in the second state, in a dummy plane perpendicular to the thickness direction (Z1) of the substrate (1), the projection of the third fixing part (23) extends to the opposite sides of the projections of the two second hole walls (132). Any two of the first direction (X1), the second direction (X2), and the thickness direction (Z1) of the substrate (1) intersect each other.

3. The sealing assembly according to claim 2, characterized in that, Both the first hole wall (131) and the second hole wall (132) are flat surfaces.

4. The sealing assembly according to claim 2, characterized in that, The second hole wall surface (132) includes a first sub-surface (1321), a second sub-surface (1322), and a third sub-surface (1323) connected in sequence. The first sub-surface (1321) is connected between the second sub-surface (1322) and one of the first hole wall surfaces (131), and the third sub-surface (1323) is connected between the second sub-surface (1322) and another of the first hole wall surfaces (131). The first hole wall surface (131), the first sub-surface (1321) and the third sub-surface (1323) are all flat surfaces, and the second sub-surface (1322) is an arc-shaped surface that is concave relative to the first sub-surface (1321) and the third sub-surface (1323).

5. The sealing assembly according to claim 2, characterized in that, The substrate (1) includes a main body (11) and a protrusion (12). The protrusion (12) is disposed on one side of the main body (11), and the first through hole (13) passes through the main body (11) and the protrusion (12). The first fixing part (21) is located on the side of the main body (11) away from the protrusion (12). The surface of the protrusion (12) away from the main body (11) includes two fourth sub-surfaces (1211). The two fourth sub-surfaces (1211) are centrally symmetrical about the central axis (M1) of the first through hole (13), and the fourth sub-surfaces (1211) are connected to the first hole wall (131) and the second hole wall (132). The fourth sub-surface (1211) includes a first segment (12111), a second segment (12112), and a third segment (12113) arranged and connected sequentially along the rotation direction of the third fixing part (23). The first segment (12111) and the third segment (12113) are both planes. In the thickness direction (Z1) of the substrate (1), the third segment (12113) is farther away from the seal (3) relative to the first segment (12111), and the second segment (12112) is an inclined surface. The second segment (12112) is used to guide the third fixing part (23) from the first segment (12111) to the third segment (12113) during the process of the sealing assembly switching from the first state to the second state.

6. The sealing assembly according to claim 5, characterized in that, The third segment (12113) has a first groove (12113a). When the sealing assembly is in the second state, the third fixing part (23) is partially located in the first groove (12113a).

7. The sealing assembly according to claim 6, characterized in that, The depth of the first groove (12113a) is L5, 0.1mm≤L5≤0.5mm.

8. The sealing assembly according to claim 6, characterized in that, The height difference between the first segment (12111) and the third segment (12113) is h, where 0.5mm ≤ h ≤ 1.5mm.

9. The sealing assembly according to claim 1, characterized in that, The substrate (1) includes a main body (11) and a protrusion (12). The protrusion (12) is disposed on one side of the main body (11), and the first through hole (13) passes through the main body (11) and the protrusion (12). The first fixing part (21) is located on the side of the main body (11) away from the protrusion (12). When the sealing assembly is in the second state, the third fixing part (23) is located on the side of the protrusion (12) away from the main body (11).

10. The sealing assembly according to claim 9, characterized in that, The main body (11) is recessed in a direction away from the protrusion (12) to form a recess (111). The recess (111) has a concave surface (1111) and a convex surface (1112) disposed opposite to each other. The protrusion (12) is disposed on the concave surface (1111), and the first through hole (13) passes through the convex surface (1112), the concave surface (1111), and the protrusion (12).

11. The sealing assembly according to claim 10, characterized in that, The main body (11) further includes a straight portion (112), which is arranged circumferentially around the recess (111) and connected to the recess (111). The recess (111) includes a first portion (1113), which is arranged parallel to the straight portion (112). The first portion (1113) has a first surface (11131) on which the protrusion (12) is disposed. The straight portion (112) has a second surface (1121) and a third surface (1122) disposed opposite to each other. The third surface (1122) is disposed close to the first fixing portion (21), and the second surface (1121) is disposed away from the first fixing portion (21). The second surface (1121) is provided with a second groove (11211), the second groove (11211) extending from the inside out through the side periphery of the straight portion (112); and / or, The recess (111) further includes a second portion (1114), which is arranged circumferentially around the first portion (1113) and connected between the first portion (1113) and the straight portion (112), and the second portion (1114) is inclined relative to the first portion (1113); and / or, In the thickness direction (Z1) of the substrate (1), the first surface (11131) is located between the second surface (1121) and the third surface (1122); and / or, The protrusion (12) has a fourth surface (121) disposed away from the main body (11), and the distance between the second surface (1121) and the fourth surface (121) in the thickness direction (Z1) of the substrate (1) is H1, 2mm≤H1≤6mm; and / or, The first portion (1113) has a fifth surface (11132) away from the protrusion (12), the distance between the fifth surface (11132) and the fourth surface (121) in the thickness direction (Z1) of the substrate (1) being H2, 1mm≤H2≤6mm, and / or, H2=2H1; and / or, The first portion (1113) has a fifth surface (11132) away from the protrusion (12), and the distance between the fifth surface (11132) and the third surface (1122) in the thickness direction (Z1) of the substrate (1) is H3, 0.5mm≤H3≤3mm.

12. The sealing assembly according to any one of claims 1 to 11, characterized in that, The substrate (1) has a third groove (113) on its surface facing the first fixing part (21). When the sealing assembly is in the second state, at least part of the sealing member (3) is embedded in the third groove (113).

13. The sealing assembly according to any one of claims 1 to 11, characterized in that, In a dummy plane perpendicular to the thickness direction (Z1) of the substrate (1), the projection of the first fixing part (21) falls into the projection area of ​​the outer contour of the sealing member (3).

14. The sealing assembly according to claim 13, characterized in that, The dimension from the central axis (M1) of the first through hole (13) to the side periphery of the first fixing part (21) is R1, and the dimension from the central axis (M1) of the first through hole (13) to the side periphery of the sealing element (3) is R2, 0.7R2≤R1≤0.95R2.

15. A single battery cell, characterized in that, It includes a housing, an electrode assembly, and a sealing assembly as described in any one of claims 1 to 14, wherein the sealing assembly is mounted on the housing and the electrode assembly is disposed within the housing.

16. An electrical appliance, characterized in that, Includes the battery cell as described in claim 15.

17. A method for assembling a sealing assembly, which refers to the sealing assembly as described in any one of claims 1 to 14, characterized in that, The assembly method of the sealing assembly includes: The third fixing part (23) passes through the first through hole (13) on the substrate (1) so that the first fixing part (21) and the third fixing part (23) are disposed on opposite sides of the substrate (1) along the thickness direction (Z1) of the substrate (1), and in a virtual plane perpendicular to the thickness direction (Z1) of the substrate (1), the projection of the third fixing part (23) is entirely located within the projection area of ​​the first through hole (13), so that the sealing assembly is switched to the first state; The first fixing part (21) is pressed against the sealing member (3) and the fixing member (2) is rotated until the projection part of the third fixing part (23) is located outside the projection area of ​​the first through hole (13) in a dummy plane perpendicular to the thickness direction (Z1) of the substrate (1), and the third fixing part (23) abuts against the substrate (1), so that the sealing assembly is switched to the second state.

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