Sealing element, cover plate assembly, battery and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a sealing element, a cover plate assembly, a battery and an electric device. The sealing piece comprises a first sealing part and a second sealing part which extend in the axial direction, and the second sealing part is arranged on the periphery of the first sealing part in a surrounding mode and located at one axial end of the first sealing part so that the section of the sealing piece can be in an L shape. The size of the second sealing part in the radial direction is L1, the size of the second sealing part in the axial direction is H1, the size of the first sealing part in the radial direction is L2, the difference value of the size of the first sealing part and the size of the second sealing part in the axial direction is H2, L1 / H1 is smaller than or equal to 3, and / or H2 / L2 is smaller than or equal to 5. Through the size limitation, the sealing element can be prevented from generating stress concentration during freezing, and the sealing element is prevented from generating hidden cracks during freezing and trimming, so that the sealing element has better sealing effect and insulating effect.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a sealing member, a cover plate assembly, a battery and an electrical device. Background Art

[0002] Generally speaking, the cross-section of the seals on the battery cover assembly is mostly L-shaped. The L-shaped seal can meet the dual requirements of axial compression sealing and radial sealing at the same time. Therefore, it can fit tightly to the connection between the cover and the pole, effectively preventing electrolyte leakage and external moisture and gas intrusion, while providing reliable insulation protection for the pole.

[0003] During the seal production process, a preliminary product is first produced through injection molding or other molding processes. However, these preliminary products often have unwanted corners or uneven edges. Trimming is necessary to remove these unwanted corners and reduce friction and wear during installation and use, thereby extending the seal's service life.

[0004] The related art typically uses a freeze trimming process to remove burrs during seal production to ensure the seal's appearance quality and sealing performance. However, in actual production, it has been found that some seals are prone to developing hidden cracks. These hidden cracks not only lead to seal failure, causing electrolyte leakage, resulting in battery capacity loss and even serious safety accidents such as short circuits and fires, but also damage the seal's insulation performance, increase the risk of internal short circuits, and seriously threaten the safe and stable operation of the battery system.

[0005] Therefore, there is an urgent need for a sealing member, a cover assembly, a battery and an electrical device to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a seal, a cover assembly, a battery and an electrical device, which can avoid the seal from generating hidden cracks during freezing and trimming, so that the seal has better sealing and insulating effects.

[0007] To achieve the above objectives, the following technical solutions are provided:

[0008] A seal comprising:

[0009] A first sealing portion and a second sealing portion extending in the axial direction, wherein the second sealing portion is arranged around the outer periphery of the first sealing portion and is located at one axial end of the first sealing portion, so that the cross section of the sealing member is L-shaped;

[0010] The second sealing portion has a radial dimension L1 and an axial dimension H1. The first sealing portion has a radial dimension L2. The difference in axial dimension between the first sealing portion and the second sealing portion is H2, wherein L1 / H1≤3, and / or H2 / L2≤5.

[0011] As an alternative, L1 ≥ 1 mm;

[0012] and / or, H1 ≥ 0.5 mm.

[0013] As an option, L2 ≥ 0.5 mm.

[0014] A cover plate assembly includes a cover plate, a pole and the above-mentioned sealing member, wherein the cover plate has a first mounting hole, the pole is passed through the first mounting hole, and the first sealing portion is sandwiched between the outer peripheral surface of the pole and the inner wall of the first mounting hole.

[0015] As an optional solution, the cover plate is in the shape of an elongated strip, the dimension of the pole along the length direction of the cover plate is D1, the dimension of the pole along the width direction of the cover plate is D2, and D1≥D2.

[0016] As an optional solution, the cover plate assembly further includes a rivet, and the pole passes through the cover plate and is connected to the rivet.

[0017] As an optional solution, the cover plate assembly further includes a first insulating member, which is arranged between the rivet and the cover plate;

[0018] And / or, the cover plate assembly further includes a second insulating member, at least a portion of which is disposed between the cover plate and the pole.

[0019] As an optional solution, a first limiting groove is provided on a side of the cover plate facing the first insulating member, and at least a portion of the first insulating member is located in the first limiting groove;

[0020] And / or, a second limiting groove is provided on a side of the second insulating member facing the cover plate, and at least a portion of the cover plate is disposed in the second limiting groove.

[0021] A battery comprises a shell and an electrode group, and also comprises the above-mentioned cover plate assembly, wherein the electrode group is arranged in the shell, the cover plate assembly is arranged on the shell, and the cover plate assembly is connected to the electrode group.

[0022] An electric device includes an electric device body and the above-mentioned battery, wherein the battery is configured to supply power to the electric device body.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the seal provided by the present invention, the second sealing portion has a radial dimension of L1 and an axial dimension of H1, the first sealing portion has a radial dimension of L2, and the difference between the axial dimensions of the first and second sealing portions is H2, wherein L1 / H1 ≤ 3, and / or H2 / L2 ≤ 5. This dimensioning prevents stress concentration in the seal during freezing, thereby preventing uneven shrinkage of the seal during freezing, which could lead to stress concentration and microcracks, thereby ensuring that the seal has good sealing and insulation properties.

[0025] The cover plate assembly provided by the present invention has good sealing and insulating effects by applying the above-mentioned sealing member, thereby extending the service life.

[0026] The battery provided by the present invention has good sealing and insulating effects by applying the above-mentioned cover plate assembly, thereby improving the safety performance of the battery and extending the service life.

[0027] The electric device provided by the present invention, by applying the above-mentioned battery, has good sealing and insulating effects, thereby improving the safety performance of the battery and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 A first structural schematic diagram of a cover plate assembly provided in an embodiment of the present invention;

[0030] Figure 2 A second structural schematic diagram of a cover plate assembly provided in an embodiment of the present invention;

[0031] Figure 3 An exploded view of a cover plate assembly provided in an embodiment of the present invention;

[0032] Figure 4 for Figure 2 Cross-sectional view at AA in the middle;

[0033] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0034] Figure 6 A cross-sectional view of a seal provided in accordance with an embodiment of the present invention.

[0035] Reference numerals:

[0036] 100. Cover plate assembly;

[0037] 10. Pole; 11. Body; 12. Base plate;

[0038] 20. Riveted piece; 21. Second mounting hole;

[0039] 30. Cover plate; 31. First mounting hole; 32. Liquid injection hole; 33. Polarity mark; 34. First limiting groove;

[0040] 40. Sealing member; 41. First sealing portion; 411. Fifth mounting hole; 42. Second sealing portion;

[0041] 51. First insulating member; 511. Third mounting hole; 512. Accommodating groove; 52. Second insulating member; 521. Fourth mounting hole; 522. Second limiting groove; 523. Third limiting groove. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0044] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0045] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0048] like Figure 1-Figure 5 As shown, this embodiment provides a cover plate assembly 100, which is used to seal the opening of the battery housing and realize the connection between the internal chemical system of the battery and the main body of the external electrical device.

[0049] Specifically, the cover plate assembly 100 includes a cover plate 30, a seal 40, a pole 10, and a rivet 20. The pole 10 includes a body 11 and a base plate 12. The body 11 is disposed on the base plate 12. The cover plate 30 has a first mounting hole 31, through which the body 11 is inserted. The pole 10 passes through the first mounting hole 31 from one side of the cover plate 30 and is connected to the rivet 20. The cover plate 30 is sandwiched between the base plate 12 and the rivet 20, thereby assembling the pole 10 and the rivet 20 to the cover plate 30. The base plate 12 of the pole 10 is connected to the electrode group. The pole group can be short-circuited to the outside through the pole 10, facilitating battery charging and discharging. The seal 40 is sandwiched between the pole 10 and the cover plate 30. The seal 40 can insulate and isolate the pole 10 and the cover plate 30 to prevent short circuit between the pole 10 and the cover plate 30. At the same time, the seal 40 can seal the gap between the column part 11 and the first mounting hole 31 to prevent leakage of electrolyte or gas.

[0050] Optionally, a liquid injection hole 32 is provided on the cover plate 30 , and electrolyte is injected into the shell through the liquid injection hole 32 .

[0051] Optionally, a polarity mark 33 is provided on the cover plate 30 for marking the positive and negative poles of the pole 10 , so that a worker can distinguish the positive or negative pole of the pole 10 .

[0052] Optionally, the cover plate 30 is in an elongated strip shape, with the length of the pole 10 along the cover plate 30 being D1, and the width of the pole 10 along the cover plate 30 being D2, where D1 ≥ D2. This dimensioning allows the length of the pole 10 along the cover plate 30 to be increased while maintaining the width of the cover plate 30, thereby increasing the flow area of ​​the pole 10 and improving the flow capacity of the pole 10.

[0053] Optionally, the seal 40 includes a first sealing portion 41 and a second sealing portion 42 extending in the axial direction. The second sealing portion 42 is disposed around the outer periphery of the first sealing portion 41 and is located at one axial end of the first sealing portion 41, so that the cross-section of the seal 40 is L-shaped. The first sealing portion 41 is sandwiched between the outer peripheral surface of the pole 10 and the inner wall of the first mounting hole 31, and the second sealing portion 42 is sandwiched between the cover plate 30 and the base plate 12. The first sealing portion 41 seals the gap between the column portion 11 and the cover plate 30 and insulates the column portion 11 from the cover plate 30. The second sealing portion 42 seals the base plate 12 from the cover plate 30, thereby improving the sealing effect of the seal 40.

[0054] During the production process, the seal 40 may develop defects such as burrs. In related technologies, a freeze-trimming process is typically used to remove burrs during the production process to ensure the seal's appearance quality and sealing performance. However, in actual production, it has been found that some seals 40 are prone to developing hidden cracks. These hidden cracks not only lead to sealing failure of the seal 40, causing electrolyte leakage, battery capacity loss, and even serious safety accidents such as short circuits and fires, but also damage its insulation performance, increase the risk of internal short circuits in the battery, and seriously threaten the safe and stable operation of the battery system.

[0055] In order to solve the above problems, Figure 6 As shown, the second sealing portion 42 has a radial dimension of L1 and an axial dimension of H1. The first sealing portion 41 has a radial dimension of L2, and the difference in axial dimension between the first sealing portion 41 and the second sealing portion 42 is H2, where L1 / H1 ≤ 3, and / or H2 / L2 ≤ 5. This dimensioning prevents stress concentration in the seal 40 during freezing, thereby preventing microcracks caused by stress concentration due to uneven shrinkage of the seal 40 during freezing, thereby ensuring that the seal 40 has good sealing and insulation properties.

[0056] Optionally, L1 ≥ 1 mm to ensure that the airtightness between the cover plate 30 and the substrate 12 meets the use requirements. For example, the radial dimension L1 of the second sealing portion 42 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0057] Optionally, H1 ≥ 0.5 mm. This dimension setting prevents the second sealing portion 42 from having an insufficient compressed thickness, thereby ensuring that the airtightness between the cover plate 30 and the substrate 12 meets the requirements for use; at the same time, it prevents an insufficient creepage distance between the cover plate 30 and the substrate 12. For example, the axial dimension H1 of the second sealing portion 42 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0058] Optionally, L2 ≥ 0.5 mm. The seal 40 may become brittle during trimming at low temperatures. The aforementioned size restriction prevents the first sealing portion 41 from tearing due to insufficient rigidity under the impact of trimming, thereby preventing hidden cracks. For example, the radial dimension L2 of the first sealing portion 41 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0059] Table 1

[0060]

[0061] Table 1 presents the relationship between the radial dimension L1 of the second sealing portion 42, the axial dimension H1, L1 / H1, the radial dimension L2 of the first sealing portion 41, the difference in axial dimensions H2 between the first sealing portion 41 and the second sealing portion 42, and H2 / L2. Examples 1 to 3 show the values ​​of L1, H1, L1 / H1, L2, H2, and H2 / L2 that meet the use requirements; Comparative Examples 1 to 5 show the values ​​of L1, H1, L1 / H1, L2, H2, and H2 / L2 that do not meet the use requirements.

[0062] Specifically, after the pole 10 and the cover plate 30 are assembled, the sealing and insulation conditions of the seal 40 are determined to ensure the molding quality of the cover plate assembly 100 and thus ensure the safety of the battery.

[0063] In Examples 1 to 3, the values ​​of L1, H1, L1 / H1, L2, H2 and H2 / L2 are all within the specified value range, and the appearance of the seal 40 and the air tightness and insulation resistance of the cover assembly 100 can meet the use requirements.

[0064] In Comparative Example 1, the radial dimension L1 of the second sealing portion 42 is too small, the compressed width of the second sealing portion 42 is insufficient, and the airtightness of the cover plate assembly 100 cannot meet the requirements.

[0065] In Comparative Example 2, the axial dimension H1 of the second sealing portion 42 is too small, the compression thickness is insufficient, the airtightness of the cover plate assembly 100 does not meet the requirements, and the creepage distance between the cover plate 30 and the substrate 12 is insufficient.

[0066] In comparative example 3, the value of L1 / H1 is too large, hidden cracks are easily formed in the seal 40 during freeze trimming, the airtightness of the cover assembly 100 cannot meet the requirements, and the insulation of the seal 40 fails.

[0067] In comparative example 4, the radial dimension L2 of the first sealing portion 41 is too small, and the second sealing portion 42 is prone to cracks due to the "cantilever effect" during freezing and trimming. The airtightness of the cover assembly 100 cannot meet the requirements, and the insulation of the seal 40 fails.

[0068] In comparative example 5, the value of H2 / L2 is too large. During freezing trimming, the freezing shrinkage rate is uneven, resulting in an increase in the internal stress gradient and the easy occurrence of hidden cracks. The airtightness of the cover assembly 100 cannot meet the requirements, and the insulation of the seal 40 fails.

[0069] Optionally, the cover plate assembly 100 further includes a first insulating member 51 , which is located between the rivet 20 and the cover plate 30 to ensure insulation between the rivet 20 and the cover plate 30 and prevent short circuit between the rivet 20 and the cover plate 30 .

[0070] Optionally, the first insulating member 51 is provided with a receiving groove 512, into which at least a portion of the rivet 20 is embedded. The provision of the receiving groove 512 can, on the one hand, improve the positioning accuracy between the rivet 20 and the first insulating member 51, ensuring a good assembly between the two; on the other hand, it can reduce the dimension of the cover plate assembly 100 along the thickness direction of the cover plate 30, thereby improving the energy density of the battery.

[0071] Optionally, a first limiting groove 34 is provided on a side of the cover plate 30 facing the first insulating member 51, and at least a portion of the first insulating member 51 is located within the first limiting groove 34. The provision of the first limiting groove 34 can define the position of the first insulating member 51, ensuring accurate positioning between the first insulating member 51 and the cover plate 30.

[0072] Optionally, the first limiting groove 34 is non-circular, thereby improving the torsional strength of the first insulating member 51. Specifically, the first limiting groove 34 is a quadrilateral.

[0073] Optionally, the cover plate assembly 100 further includes a second insulating member 52, which is disposed on a side of the cover plate 30 facing away from the first insulating member 51, and at least a portion of the second insulating member 52 is disposed between the cover plate 30 and the substrate 12 to ensure insulation between the substrate 12 of the pole 10 and the cover plate 30, thereby preventing short circuit between the substrate 12 and the cover plate 30.

[0074] Optionally, a second limiting groove 522 is provided on the side of the second insulating member 52 facing the cover plate 30, and at least a portion of the cover plate 30 is disposed within the second limiting groove 522. Providing the second limiting groove 522 on the second insulating member 52 ensures accurate positioning of the cover plate 30 and the second insulating member 52, facilitating installation of the second insulating member 52.

[0075] Optionally, the second limiting groove 522 is non-circular, thereby improving the torsional strength of the second insulating member 52. Specifically, the second limiting groove 522 is a quadrilateral.

[0076] Optionally, a third limiting groove 523 is provided on the side of the second insulating member 52 facing away from the cover plate 30, and at least a portion of the substrate 12 is provided in the third limiting groove 523 to facilitate the positioning of the substrate 12 and the second insulating member 52, facilitate the installation of the pole 10, and at the same time reduce the size of the cover plate assembly 100 in the thickness direction of the cover plate 30, which is beneficial to improving the energy density of the battery.

[0077] During installation, the body 11 of the pole 10 sequentially passes through the fifth mounting hole 411 of the sealing member 40, the fourth mounting hole 521 of the second insulating member 52, the first mounting hole 31 of the cover plate 30, the third mounting hole 511 of the first insulating member 51, and the second mounting hole 21 of the rivet 20. After the body 11 of the pole 10 passes through the second mounting hole 21, the body 11 of the pole 10 is riveted to the rivet 20, and the base plate 12 abuts against the side of the second insulating member 52 facing away from the cover plate 30, thereby assembling the pole 10 on the cover plate 30. The first limiting groove 34, the second limiting groove 522, and the third limiting groove 523 ensure high assembly precision among the pole 10, the second insulating member 52, the cover plate 30, the first insulating member 51, and the rivet 20, and can reduce the size occupied by the cover plate assembly 100 in the thickness direction of the cover plate 30.

[0078] The present application also provides a battery comprising a housing, an electrode group, and the aforementioned cover plate assembly 100. The housing has an opening, the electrode group is disposed within the housing, and the cover plate assembly 100 covers the housing opening. The rivet 20 is connected to the electrode group, and the electrical energy generated by the electrode group can be transmitted to an external electrical device via the electrode post 10. By utilizing the aforementioned cover plate assembly 100, the battery has improved sealing and insulation properties, thereby enhancing the battery's safety and extending its service life.

[0079] The present application also provides an electrical device, which includes an electrical device body and the above-mentioned battery. The battery can provide electrical energy to the electrical device body, thereby enabling the electrical device body to automatically complete preset actions through electrical energy, ensuring good performance of the electrical device body and ensuring the service life and safety performance of the electrical device.

[0080] Specifically, the main body of the electrical device can be a vehicle, a mobile phone, a portable device, a household appliance, a laptop computer, a ship, a spacecraft, an electric toy, or an electric tool. A vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle; a new energy vehicle can be a pure electric vehicle or a hybrid vehicle; a spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft; an electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy; an electric tool includes a metal cutting power tool, a grinding power tool, an assembly power tool, and a railway power tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, or an electric planer. This embodiment does not limit the main body of the electrical device.

[0081] For ease of explanation, the following embodiments utilize a vehicle as an example of an electrical device according to one embodiment of the present application. The vehicle is equipped with batteries, which can be located at the bottom, front, or rear of the vehicle. There can be one or more batteries, and multiple batteries can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple batteries connected in both series and parallel configurations.

[0082] Batteries can be used to power a vehicle, for example, as a power source for the vehicle's operation. A vehicle may also include a controller and a motor. The controller controls the battery to power the motor, for example, for starting the vehicle, navigation, and operating power requirements during driving.

[0083] In some embodiments of the present application, the battery can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0084] Note that throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. Throughout this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be incorporated in any suitable manner in any one or more embodiments or examples.

[0085] The above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A seal, characterized in that: include: A first sealing portion (41) and a second sealing portion (42) extending in the axial direction, wherein the second sealing portion (42) is arranged around the outer periphery of the first sealing portion (41) and is located at one axial end of the first sealing portion (41), so that the cross section of the sealing member is L-shaped; The second sealing portion (42) has a radial dimension of L1 and an axial dimension of H1, the first sealing portion (41) has a radial dimension of L2, and the difference in axial dimension between the first sealing portion (41) and the second sealing portion (42) is H2, wherein L1 / H1≤3, and / or H2 / L2≤5.

2. The seal according to claim 1, wherein: L1≥1mm; and / or, H1 ≥ 0.5 mm.

3. The seal according to claim 1, wherein: L2≥0.5mm.

4. A cover plate assembly, characterized in that: The invention comprises a cover plate (30), a pole (10) and a seal according to any one of claims 1 to 3, wherein the cover plate (30) has a first mounting hole (31), the pole (10) is passed through the first mounting hole (31), and the first sealing portion (41) is sandwiched between the outer peripheral surface of the pole (10) and the inner wall of the first mounting hole (31).

5. The cover plate assembly according to claim 4, wherein: The cover plate (30) is in the shape of an elongated strip, the dimension of the pole (10) along the length direction of the cover plate (30) is D1, the dimension of the pole (10) along the width direction of the cover plate (30) is D2, and D1≥D2.

6. The cover plate assembly according to claim 4, wherein: The cover plate assembly further comprises a rivet (20), and the pole (10) passes through the cover plate (30) and is connected to the rivet (20).

7. The cover plate assembly according to claim 6, wherein: The cover plate assembly further includes a first insulating member (51), wherein the first insulating member (51) is disposed between the rivet member (20) and the cover plate (30); And / or, the cover plate assembly further includes a second insulating member (52), at least a portion of the second insulating member (52) is disposed between the cover plate (30) and the pole (10).

8. The cover plate assembly according to claim 7, wherein: A first limiting groove (34) is provided on one side of the cover plate (30) facing the first insulating member (51), and at least a portion of the first insulating member (51) is located in the first limiting groove (34); And / or, a second limiting groove (522) is provided on a side of the second insulating member (52) facing the cover plate (30), and at least a portion of the cover plate (30) is disposed in the second limiting groove (522).

9. A battery comprising a housing and an electrode group, characterized in that: It also includes the cover plate assembly according to any one of claims 4 to 8, wherein the pole group is arranged in the shell, the cover plate assembly is arranged on the shell, and the cover plate assembly is connected to the pole group.

10. An electrical device, comprising an electrical device body, characterized in that: The device further comprises the battery according to claim 9, wherein the battery is configured to supply power to the electrical device.

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