Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery cell comprises: a housing provided with a liquid injection hole; the sealing assembly comprises an elastic sleeve and a filling material, the elastic sleeve is of a structure with one end open and one end closed, the elastic sleeve is arranged in the liquid injection hole in a penetrating mode, the opening of the elastic sleeve is arranged outwards, the filling material is filled and solidified in the elastic sleeve to form a filling piece, and the elastic sleeve is in tight fit with the hole wall of the liquid injection hole by means of extrusion force of the filling piece. According to the battery monomer, the battery and the electric device, the liquid leakage risk can be reduced.

Description

Technical Field

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

[0002] In recent years, the new energy industry has received increasing attention, and as an important part of the new energy industry, batteries occupy a large share of the market.

[0003] Batteries are typically formed by connecting multiple individual cells in series, parallel, or a combination thereof. Each individual cell has an injection hole on its casing for easy filling with electrolyte. After filling, the injection hole is sealed to the casing by welding with a sealing pin. However, welding is prone to problems such as bursting and cracking, leading to subsequent leakage. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, battery, and power device that can reduce the risk of leakage in order to address the above problems.

[0005] On one hand, this application provides a battery cell, the battery cell comprising:

[0006] The outer casing has a liquid injection hole; and

[0007] A sealing assembly includes an elastic sleeve and a filling material. The elastic sleeve has a structure with one end open and the other end closed. The elastic sleeve is inserted into the injection hole with the opening facing outward. The filling material fills and solidifies inside the elastic sleeve to form a filler. The elastic sleeve is sealed to the wall of the injection hole by means of the extrusion force of the filler.

[0008] In some embodiments, the filler is melted by heat or broken by external force to relieve its compressive force on the elastic sleeve.

[0009] In some embodiments, the injection hole is a stepped hole, which includes a first segment and a second segment arranged sequentially from the outside to the inside along the axial direction of the injection hole and connected to each other, wherein the inner diameter of the first segment is larger than the inner diameter of the second segment.

[0010] The elastic sleeve includes an opening and a sealing part that are connected and communicate with each other. The opening overlaps within the first section, and the sealing part is located within the second section and is sealed to the wall of the hole in the second section.

[0011] In some embodiments, the opening is spaced apart from the sidewall of the hole in the first segment.

[0012] In some embodiments, the elastic sleeve further includes a closure portion disposed at one end of the sealing portion away from the opening portion, and connected to and communicating with the sealing portion, wherein the filling material fills the opening portion, the sealing portion and the closure portion;

[0013] The sealing portion is located inside the outer casing, and the projection portion of the sealing portion and the outer casing overlap in the axial direction of the injection hole.

[0014] In some embodiments, the sealing portion includes a first sub-portion and a second sub-portion arranged sequentially from the outside to the inside along the axial direction of the injection hole and connected to each other, wherein the first sub-portion is connected to the opening portion;

[0015] The diameter of the first sub-part is larger than the diameter of the second sub-part, and the first sub-part is in close contact with the hole wall of the second segment, while the second sub-part is separated from the hole wall of the second segment.

[0016] In some embodiments, the length of the first sub-part in the axial direction of the injection hole is H1, the length of the second sub-part in the axial direction of the injection hole is H2, and the depth of the injection hole in its axial direction is H3; H1 = (1 / 3 - 3 / 4)(H1 + H2); or, H1 = (1 / 3 - 3 / 4)H3;

[0017] And / or, the wall thickness of the first sub-part in the radial direction of the injection hole is T1, and the wall thickness of the second sub-part in the radial direction of the injection hole is T2; 0.5mm≤T1≤3mm, 1 / 4T1≤T2≤3 / 4T1.

[0018] In some embodiments, the roughness Ra of the inner wall surface of the elastic sleeve is greater than or equal to 0.8 μm;

[0019] And / or, the outer end face of the filler facing away from the interior of the housing is located inside the elastic sleeve, and the outer end face of the elastic sleeve facing away from the interior of the housing is located inside the injection hole.

[0020] On the other hand, this application also provides a battery comprising a battery cell as described in any of the foregoing claims.

[0021] In addition, this application also provides an electrical device, which includes a battery as described in the above embodiments.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] In this application, the battery cell, battery, and electrical device use an elastic sleeve to seal the injection hole with the extrusion force of the filler, which replaces the welding sealing method of the injection hole in the prior art. This avoids a series of problems such as bursting and cracking, and the risk of subsequent leakage is also reduced. Attached Figure Description

[0024] Figure 1 This is a top view of a battery cell according to an embodiment of the present application, showing the completed assembly of the sealing component and the end cap.

[0025] Figure 2 for Figure 1 The cross-sectional view of the battery cell along the AA direction is shown.

[0026] Figure 3 for Figure 2 An enlarged schematic diagram of a partial structure B of the battery cell shown;

[0027] Figure 4 for Figure 3 The diagram shows the structural schematic of the sealing assembly in the battery cell.

[0028] Figure 5 This is a top view of a battery cell in an embodiment of this application before the sealing assembly and end cap are fully assembled;

[0029] Figure 6 for Figure 5 The cross-sectional view of the battery cell along the CC direction is shown.

[0030] Figure 7 for Figure 6 The diagram shows an enlarged view of the partial structure D of the battery cell.

[0031] Icon labels:

[0032] 100. Battery cell;

[0033] 10. End cap; 20. Sealing assembly;

[0034] 11. Injection hole; 111. First section; 112. Second section;

[0035] 21. Elastic sleeve; 211. Opening; 212. Sealing part; 2121. First sub-part; 2122. Second sub-part; 213. Closing part; 22. Filler. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0043] Batteries are typically formed by connecting multiple individual cells in series, parallel, or a combination thereof. Each individual cell has an injection hole on its casing for easy filling with electrolyte. After filling, the injection hole is sealed to the casing by welding with a sealing pin. However, welding is prone to problems such as bursting and cracking, leading to subsequent leakage.

[0044] Please see Figures 1 to 4 To alleviate the above problems, this application provides a battery cell 100, which includes a housing and a sealing assembly 20. The housing has an injection hole 11. The sealing assembly 20 includes an elastic sleeve 21 and a filling material. The elastic sleeve 21 has a structure with one end open and the other end closed. The elastic sleeve 21 passes through the injection hole 11 and the opening of the elastic sleeve 21 faces outward. The filling material fills and solidifies in the elastic sleeve 21 to form a filler 22. The elastic sleeve 21 is sealed to the hole wall of the injection hole 11 by the extrusion force of the filler 22.

[0045] Specifically, the battery cell 100 can be a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 100 can be cylindrical, flat, square, or other shapes.

[0046] The outer casing of the battery cell 100 typically includes a housing and an end cap 10. The end cap 10 covers the opening of the housing and, together with the housing, defines the internal environment of the battery cell 100, within which the electrolyte is sealed. An electrolyte injection port 11 is typically located on the end cap 10; however, in some other embodiments, the electrolyte injection port 11 may also be located on the housing. For ease of explanation, the following embodiments will use the example of the electrolyte injection port 11 being located on the end cap 10.

[0047] The elastic sleeve 21 can be a sleeve structure made of rubber, silicone, or other elastic materials. The filler material can be a cured adhesive, hot melt adhesive, etc. During the process of forming the filler 22, the filler material can expand in volume and compress the elastic sleeve 21.

[0048] During actual assembly, the elastic sleeve 21 is inserted into the injection hole 11 with its opening facing outwards. Then, filler material is injected into the elastic sleeve 21 through its opening. As the filler material solidifies and forms the filler 22, its volume expands, allowing the filler 22 to exert a compressive force on the elastic sleeve 21, causing it to deform and adhere tightly to the wall of the injection hole 11, thus sealing the injection hole 11.

[0049] As mentioned above, the method of sealing the injection hole 11 by means of the elastic sleeve 21 and the extrusion force of the filler 22 in this application, instead of the welding sealing method of the injection hole 11 in the prior art, will not cause a series of problems such as bursting or cracking, and the risk of subsequent leakage will also be reduced.

[0050] Furthermore, it is worth mentioning that, in this application, the method of using a filling material to cure and form the filling element 22 is more flexible and unrestricted in shape than the method of directly inserting the filling element 22 into the elastic sleeve 21. It can be adjusted according to the specific shape of the elastic sleeve 21, thereby ensuring sealing in multiple directions and improving the sealing effect of the injection hole 11.

[0051] Furthermore, in some embodiments, the filler 22 is melted by heat or broken by external force to remove its compressive force on the elastic sleeve 21. Taking the fillinger 22 being broken by external force as an example, after the fillinger 22 is broken, the compressive force of the fillinger 22 on the elastic sleeve 21 is removed. Then, the fillinger 22 and the elastic sleeve 21 are removed in sequence, thus completing the disassembly of the elastic sleeve 21. This allows the battery cell 100 to be replenished with liquid again through the injection hole 11. When the liquid replenishment is completed, the elastic sleeve 21 is reinstalled into the injection hole 11, and then the injection hole 11 is resealed by filling and solidifying the filling material.

[0052] It is understood that removing the filler 22 and the elastic sleeve 21 means removing the filler 22 from the elastic sleeve 21 and removing the elastic sleeve 21 from the injection hole 11.

[0053] Therefore, in this embodiment, by designing the filler 22 to melt when heated or break when subjected to external force, the sealing assembly 20 can be quickly disassembled and resealed. When the sealing assembly 20 is disassembled, it is convenient to replenish the electrolyte in the battery cell 100. When the sealing assembly 20 is resealed, it effectively prevents the leakage of electrolyte.

[0054] Please refer to it again. Figure 3 and Figure 4 In some embodiments, the injection hole 11 is a stepped hole, which includes a first section 111 and a second section 112 arranged and connected sequentially from the outside to the inside along the axial direction of the injection hole 11. The inner diameter of the first section 111 is larger than the inner diameter of the second section 112. The elastic sleeve 21 includes an opening 211 and a sealing part 212 connected and communicating with each other. The opening 211 overlaps in the first section 111, and the sealing part 212 is located in the second section 112 and is sealed to the hole wall of the second section 112.

[0055] Specifically, in the radial direction of the injection hole 11, the opening 211 is folded over and overlapped with the sealing part 212 inside the first section 111. In this way, when filling material is injected into the elastic sleeve 21, the first section 111 supports the elastic sleeve 21 and provides support for the elastic sleeve 21. After the sealing part 212 seals the injection hole 11, the first section 111 can also prevent the elastic sleeve 21 from falling into the outer shell, effectively improving the reliability of the installation of the elastic sleeve 21.

[0056] Furthermore, in some embodiments, a gap is provided between the opening 211 and the sidewall of the hole in the first segment 111. This is because, during the curing process of the filling material, the filling material expands and compresses the opening 211 of the elastic sleeve 21, causing the outer peripheral side of the opening 211 to move closer to the sidewall of the hole in the first segment 111. By leaving a gap between the opening 211 and the sidewall of the hole in the first segment 111, the outer peripheral side of the opening 211 has a certain amount of room to move, thus avoiding excessive contact between the outer peripheral side of the opening 211 and the sidewall of the hole in the first segment 111, which would increase the difficulty of disassembling the elastic sleeve 21 during subsequent fluid replenishment.

[0057] In some embodiments, the elastic sleeve 21 further includes a closing portion 213, which is disposed at the end of the sealing portion 212 away from the opening portion 211 and is connected to and communicates with the sealing portion 212. The filling material fills the opening portion 211, the sealing portion 212 and the closing portion 213. The closing portion 213 is located inside the housing, and in the axial direction of the injection hole 11, the projection portion of the closing portion 213 and the housing overlap.

[0058] Specifically, the opening 211 and the closing part 213 cooperate to clamp the end plate together.

[0059] In this embodiment, the closure 213 cooperates with the opening 211, reducing the risk of the elastic sleeve 21 falling into or out of the housing and improving the reliability of the elastic sleeve 21 installation. Furthermore, the closure 213, under the pressure of the cured filling material, can also seal tightly against the inner wall of the housing, further improving the sealing effect and achieving the goal of preventing electrolyte leakage.

[0060] In some embodiments, the sealing portion 212 includes a first sub-portion 2121 and a second sub-portion 2122 arranged sequentially from the outside to the inside and connected along the axial direction of the injection hole 11. The first sub-portion 2121 is connected to the opening portion 211. The diameter of the first sub-portion 2121 is larger than the diameter of the second sub-portion 2122, and the first sub-portion 2121 is in tight fit with the hole wall of the second segment 112. The second sub-portion 2122 is separated from the hole wall of the second segment 112. A certain space margin can be left between the second sub-portion 2122 and the second segment 112 to avoid the elastic sleeve 21 failing to install due to overpressure when the filling material is injected in excessive amounts and expands.

[0061] Please refer to the following: Figures 3 to 7 In some embodiments, the wall thickness of the first sub-part 2121 is greater than the wall thickness of the second sub-part 2122.

[0062] In the actual assembly process, the opening 211 of the elastic sleeve 21 is first overlapped with the first section 111 of the injection hole 11, and part of the first sub-part 2121 of the elastic sleeve 21 passes through the injection hole 11. At this time, the remaining part of the first sub-part 2121, the second sub-part 2122, and the closing part 213 of the elastic sleeve 21 pass through the opening of the elastic sleeve 21 and protrude from the outer shell (specifically as follows). Figure 7 (As shown). Then, press the sealing part 213, causing the second sub-part 2122 to flip and pass into the injection hole 11. At the same time, the sealing part 213 passes through the first sub-part 2121 and the second sub-part 2122 and sinks into the outer shell, thereby realizing the installation of the elastic sleeve 21 (specifically as shown). Figure 3 (As shown).

[0063] In this embodiment, by designing the wall thickness of the first sub-part 2121 to be greater than the wall thickness of the second sub-part 2122, the larger wall thickness of the first sub-part 2121 facilitates insertion into the injection hole 11 and positioning, while the thinner wall thickness of the second sub-part 2122 facilitates flipping, thereby improving the ease of installation of the elastic sleeve 21.

[0064] Furthermore, in some embodiments, the wall thickness of the first sub-part 2121 in the radial direction of the injection hole 11 is T1, and the wall thickness of the second sub-part 2122 in the radial direction of the injection hole 11 is T2; 0.5mm≤T1≤3mm, 1 / 4T1≤T2≤3 / 4T1.

[0065] Specifically, 0.5mm≤T1≤3mm, meaning the wall thickness of the first sub-part 2121 at all positions along its length is in the range of 0.5mm to 3mm; 1 / 4T1≤T2≤3 / 4T1, meaning the wall thickness of the second sub-part 2122 at all positions along its length is in the range of 1 / 4T1 to 3 / 4T1.

[0066] By setting 0.5mm≤T1≤3mm and 1 / 4T1≤T2≤3 / 4T1, the first sub-part 2121 is reliably positioned when inserted into the injection hole 11 and is not easily shaken. The second sub-part 2122 is easy to flip, thereby improving the ease of installation of the elastic sleeve 21.

[0067] In some embodiments, the length of the first sub-part 2121 in the axial direction of the injection hole 11 is H1, the length of the second sub-part 2122 in the axial direction of the injection hole 11 is H2, and the depth of the injection hole 11 in its axial direction is H3; H1 = (1 / 3 - 3 / 4)(H1 + H2); or, H1 = (1 / 3 - 3 / 4)H3. Under this design, when assembling the elastic sleeve 21, the length of the first sub-part 2121 extending into the injection hole 11 for positioning and installation is appropriate, and the positioning of the first sub-part 2121 is stable.

[0068] In some embodiments, the roughness Ra of the inner wall surface of the elastic sleeve 21 is greater than or equal to 0.8 μm, meaning the inner wall surface of the elastic sleeve 21 is relatively rough. This design increases the contact area between the filler material and the elastic sleeve 21, and improves the bonding force between the filler material and the elastic sleeve 21. Therefore, after the filler material cures to form the filler 22, the filler 22 is not easily detached from the elastic sleeve 21, and it can effectively compress the elastic sleeve 21, improving the sealing effect.

[0069] Please see Figure 3 In some embodiments, the outer end face of the filler 22 facing away from the inside of the outer shell is located inside the elastic sleeve 21, and the outer end face of the elastic sleeve 21 facing away from the inside of the outer shell is located inside the injection hole 11. That is, the outer end faces of both the filler 22 and the elastic sleeve 21 are located inside the injection hole 11. This design can prevent the filler 22 and the elastic sleeve 21 from protruding out of the injection hole 11 and being scratched and dislodged, and the sealing reliability of the elastic sleeve 21 is higher.

[0070] As an example, the outer end faces of both the filler 22 and the elastic sleeve 21 can be flush with the surface where the outward opening of the injection hole 11 is located, or the outer end faces of both the filler 22 and the elastic sleeve 21 can be located between the two opposite openings of the injection hole 11.

[0071] Please see Figure 1 This application also provides a battery comprising a battery cell 100 as described in any of the above embodiments.

[0072] The battery in this application has the effects of any of the above embodiments, so it will not be described again here.

[0073] This application also provides an electrical device that includes a battery as described in any of the above embodiments, the battery being used to provide electrical energy to the electrical device.

[0074] The electrical device in this application has the effects of any of the above embodiments, so it will not be described again here.

[0075] The electrical devices can include, but are 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.

[0076] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above.

[0077] In this application, the battery cell 100, battery, and electrical device are sealed by the extrusion force of the filler 22 using the elastic sleeve 21, which replaces the welding sealing method of the filler 22 in the prior art. This method avoids a series of problems such as bursting and cracking, and the risk of subsequent leakage is also reduced.

[0078] 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.

[0079] 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, characterized in that, The battery cell includes: The outer casing has an injection hole (11) thereon; and The sealing assembly (20) includes an elastic sleeve (21) and a filling material. The elastic sleeve (21) has a structure with one end open and the other end closed. The elastic sleeve (21) is inserted into the injection hole (11) with the opening of the elastic sleeve (21) facing outward. The filling material fills and solidifies in the elastic sleeve (21) to form a filler (22). The elastic sleeve (21) is sealed to the hole wall of the injection hole (11) by means of the extrusion force of the filler (22).

2. The battery cell according to claim 1, characterized in that, The filler (22) is melted by heat or broken by external force to remove its compressive force on the elastic sleeve (21).

3. The battery cell according to claim 1, characterized in that, The injection hole (11) is a stepped hole, which includes a first section (111) and a second section (112) arranged and connected sequentially from the outside to the inside along the axial direction of the injection hole (11). The inner diameter of the first section (111) is larger than the inner diameter of the second section (112). The elastic sleeve (21) includes an opening (211) and a sealing part (212) that are connected and communicate with each other. The opening (211) overlaps within the first section (111), and the sealing part (212) is located within the second section (112) and is sealed to the wall of the hole in the second section (112).

4. The battery cell according to claim 3, characterized in that, The opening (211) is spaced from the sidewall of the hole in the first segment (111).

5. The battery cell according to claim 3, characterized in that, The elastic sleeve (21) further includes a closing part (213), which is disposed at one end of the sealing part (212) away from the opening (211) and is connected and communicates with the sealing part (212). The filling material fills the opening (211), the sealing part (212) and the closing part (213). The closure (213) is located inside the outer shell, and the projection of the closure (213) and the outer shell overlaps in the axial direction of the injection hole (11).

6. The battery cell according to claim 3, characterized in that, The sealing part (212) includes a first sub-part (2121) and a second sub-part (2122) arranged and connected sequentially from the outside to the inside along the axial direction of the injection hole (11), and the first sub-part (2121) is connected to the opening part (211). The diameter of the first sub-part (2121) is larger than the diameter of the second sub-part (2122), and the first sub-part (2121) is in close contact with the hole wall of the second segment (112), while the second sub-part (2122) is separated from the hole wall of the second segment (112).

7. The battery cell according to claim 6, characterized in that, The length of the first sub-part (2121) in the axial direction of the injection hole (11) is H1, the length of the second sub-part (2122) in the axial direction of the injection hole (11) is H2, and the depth of the injection hole (11) in its axial direction is H3; H1 = (1 / 3 - 3 / 4)(H1 + H2); or, H1 = (1 / 3 - 3 / 4)H3; And / or, the wall thickness of the first sub-part (2121) in the radial direction of the injection hole (11) is T1, and the wall thickness of the second sub-part (2122) in the radial direction of the injection hole (11) is T2; 0.5mm≤T1≤3mm, 1 / 4T1≤T2≤3 / 4T1.

8. The battery cell according to claim 1, characterized in that, The roughness Ra of the inner wall surface of the elastic sleeve (21) is greater than or equal to 0.8 μm; And / or, the outer end face of the filler (22) facing away from the inside of the housing is located inside the elastic sleeve (21), and the outer end face of the elastic sleeve (21) facing away from the inside of the housing is located inside the injection hole (11).

9. A battery, characterized in that, The battery comprises a battery cell as described in any one of claims 1 to 8 above.

10. An electrical device, characterized in that, The electrical device includes the battery as described in claim 9.

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