A seal, cover plate assembly, battery and electric device

Abstract

The application relates to the technical field of batteries, in particular to a sealing piece, a cover plate assembly, a battery and an electric device. The sealing piece comprises a first sealing part and a second sealing part extending along an axial direction, the second sealing part is arranged around the outer periphery of the first sealing part and is located at one end of the first sealing part in the axial direction, so that the cross section of the sealing piece is L-shaped; the radial dimension of the second sealing part is L1, the axial dimension of the second sealing part is H1, the radial dimension of the first sealing part is L2, and the difference between the axial dimensions of the first sealing part and the second sealing part is H2, wherein L1 / H1<=3 and / or H2 / L2<=5. Through the size limitation, the sealing piece can avoid stress concentration when being frozen, and can avoid hidden cracks when being frozen and cut, so that the sealing piece has better sealing effect and insulation effect.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a sealing element, a cover assembly, a battery, and an electrical device. Background Technology

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

[0003] In the production process of seals, preliminary products are first made through injection molding or other molding processes. However, these preliminary products often have excess corners or uneven edges. At this time, edge trimming is required to remove the excess corners, which can reduce friction and wear during installation and use, thereby extending the service life of the seals.

[0004] Related technologies typically employ a cryogenic trimming process to remove burrs during seal production, ensuring 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 decay or even serious safety accidents such as short circuits and fires, but also damage their insulation properties, increasing the risk of internal short circuits and seriously threatening the safe and stable operation of the battery system.

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

[0006] The purpose of this invention is to provide a sealing element, a cover plate assembly, a battery, and an electrical device that can prevent the sealing element from developing hidden cracks during freezing and cutting, thereby enabling the sealing element to have better sealing and insulation effects.

[0007] To achieve the above objectives, the following technical solution is provided:

[0008] A seal comprising:

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

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

[0011] As an optional option, L1 ≥ 1 mm;

[0012] And / or, H1≥0.5mm.

[0013] As an optional option, L2 ≥ 0.5 mm.

[0014] A cover plate assembly includes a cover plate, an electrode post, and the aforementioned sealing element. The cover plate has a first mounting hole, the electrode post passes through the first mounting hole, and the first sealing portion is sandwiched between the outer peripheral surface of the electrode post and the inner wall of the first mounting hole.

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

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

[0017] As an optional solution, the cover plate assembly further includes a first insulating member disposed between the riveting member 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 post.

[0019] As an optional solution, the cover plate is provided with a first limiting groove on the side 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, the second insulating member is provided with a second limiting groove on the side facing the cover plate, and at least a portion of the cover plate is disposed within the second limiting groove.

[0021] A battery includes a housing and an electrode assembly, and also includes the aforementioned cover assembly, wherein the electrode assembly is disposed within the housing, the cover assembly is disposed on the housing, and the cover assembly is connected to the electrode assembly.

[0022] An electrical device includes a device body and the aforementioned battery, the battery being configured to supply power to the device body.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The sealing element provided by this invention has a second sealing portion with a radial dimension of L1 and an axial dimension of H1, a first sealing portion with a radial dimension of L2, and a difference in axial dimensions between the first and second sealing portions of H2, wherein L1 / H1≤3 and / or H2 / L2≤5. By setting these dimensions, stress concentration during freezing can be avoided, thus preventing uneven shrinkage of the sealing element during freezing, which could lead to stress concentration and microcracks. This ensures the sealing element has good sealing and insulation properties.

[0025] The cover plate assembly provided by the present invention, by applying the above-mentioned sealing element, has a better sealing and insulation effect and extends its service life.

[0026] The battery provided by this invention, by applying the above-mentioned cover plate assembly, has a better sealing and insulation effect, improves the safety performance of the battery, and extends its service life.

[0027] The electrical device provided by this invention, by using the aforementioned battery, has better sealing and insulation effects, improves battery safety performance, and extends service life. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

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

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

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

[0032] Figure 4 for Figure 2 Sectional view at point AA;

[0033] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

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

[0035] Figure label:

[0036] 100. Cover plate assembly;

[0037] 10. Pole post; 11. Pillar section; 12. Substrate;

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

[0039] 30. Cover plate; 31. First mounting hole; 32. Injection hole; 33. Polarity indicator; 34. First limiting groove;

[0040] 40. Seal; 41. First sealing part; 411. Fifth mounting hole; 42. Second sealing part;

[0041] 51. First insulating component; 511. Third mounting hole; 512. Receiving groove; 52. Second insulating component; 521. Fourth mounting hole; 522. Second limiting groove; 523. Third limiting groove. Detailed Implementation

[0042] 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.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

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

[0048] like Figures 1-5 As shown, this embodiment provides a cover assembly 100 for sealing the opening of the battery casing, thereby enabling 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 sealing element 40, an electrode post 10, and a riveting element 20. The electrode post 10 includes a pillar portion 11 and a base plate 12. The pillar portion 11 is disposed on the base plate 12. The cover plate 30 has a first mounting hole 31, through which the pillar portion 11 passes. The electrode post 10 passes through the first mounting hole 31 from one side of the cover plate 30 and connects to the riveting element 20. The base plate 12 and the riveting element 20 sandwich the cover plate 30 in the middle, thus assembling the electrode post 10 and the riveting element 20 to the cover plate 30 respectively. The base plate 12 of the electrode post 10 is connected to the electrode assembly. The electrode post 10 can short-circuit and conduct electricity between the electrode assembly and the outside, facilitating battery charging and discharging. The sealing element 40 is sandwiched between the pole post 10 and the cover plate 30. The sealing element 40 can insulate and isolate the pole post 10 and the cover plate 30 to prevent short circuit between the pole post 10 and the cover plate 30. At the same time, the sealing element 40 can seal the gap between the pole body 11 and the first mounting hole 31 to prevent leakage of electrolyte or gas.

[0050] Optionally, the cover plate 30 is provided with a liquid injection hole 32, through which electrolyte is injected into the housing.

[0051] Optionally, the cover plate 30 is provided with a polarity mark 33 to mark the positive and negative terminals of the pole 10, so that staff can distinguish between the positive and negative terminals of the pole 10.

[0052] Optionally, the cover plate 30 is elongated, the pole post 10 has a length dimension of D1 along the length of the cover plate 30, and a width dimension of D2 along the width of the cover plate 30, where D1 ≥ D2. By setting the dimensions as described above, the length dimension of the pole post 10 can be increased while keeping the width of the cover plate 30 constant, thereby increasing the flow area of ​​the pole post 10 and improving its flow capacity.

[0053] Optionally, the sealing element 40 includes a first sealing portion 41 and a second sealing portion 42 extending axially. The second sealing portion 42 is disposed around the outer periphery of the first sealing portion 41 and located at one axial end of the first sealing portion 41, so that the cross-section of the sealing element 40 is L-shaped. The first sealing portion 41 is sandwiched between the outer peripheral surface of the pole post 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 pole post 11 and the cover plate 30 and insulates the pole post 11 from the cover plate 30; the second sealing portion 42 seals the base plate 12 and the cover plate 30, thereby improving the sealing effect of the sealing element 40.

[0054] During the manufacturing process, seals 40 may develop defects such as burrs. Related technologies typically employ a cryogenic trimming process to remove these burrs during production, ensuring the appearance quality and sealing performance of the seals 40. 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 seals 40, causing electrolyte leakage, resulting in battery capacity decay or even serious safety accidents such as short circuits and fires, but also damage their insulation properties, increasing the risk of internal short circuits and seriously threatening the safe and stable operation of the battery system.

[0055] To solve the above problems, such as Figure 6 As shown, the second sealing part 42 has a radial dimension of L1 and an axial dimension of H1, the first sealing part 41 has a radial dimension of L2, and the difference between the axial dimensions of the first sealing part 41 and the second sealing part 42 is H2, wherein L1 / H1≤3 and / or H2 / L2≤5. By setting these dimensions, stress concentration in the sealing element 40 during freezing can be avoided, thus preventing microcracks caused by uneven shrinkage during freezing, ensuring that the sealing element 40 has good sealing and insulation effects.

[0056] Optionally, L1 ≥ 1 mm to ensure that the airtightness between the cover plate 30 and the substrate 12 meets the usage requirements. For example, the radial dimension L1 of the second sealing part 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, etc.

[0057] Optionally, H1 ≥ 0.5 mm. This dimensional setting avoids insufficient compression thickness of the second sealing portion 42, ensuring the airtightness between the cover plate 30 and the substrate 12 meets usage requirements; it also prevents 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, etc.

[0058] Optionally, L2 ≥ 0.5 mm. The seal 40 may become brittle during low-temperature cutting. The aforementioned dimensional limitation prevents the first sealing portion 41 from tearing due to insufficient rigidity under the impact force of the cutting edge, thus avoiding the formation of hidden cracks. For example, the radial dimension L2 of the first sealing portion 41 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, etc.

[0059] Table 1

[0060]

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

[0062] Specifically, after the terminal post 10 and the cover plate 30 are assembled, the sealing and insulation conditions of the seal 40 are judged to ensure the molding quality of the cover plate assembly 100, thereby ensuring the safety of the battery.

[0063] In Examples 1-3, the values ​​of L1, H1, L1 / H1, L2, H2, and H2 / L2 are all within the defined range, and the appearance of the seal 40 and the airtightness and insulation resistance of the cover assembly 100 meet the usage requirements.

[0064] In Comparative Example 1, the radial dimension L1 of the second sealing part 42 is too small, the compression width of the second sealing part 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 part 42 is too small, the compression thickness is insufficient, the airtightness of the cover plate assembly 100 cannot 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, and hidden cracks are prone to appear when the sealing element 40 is frozen and cut. The airtightness of the cover plate assembly 100 cannot meet the requirements, and the insulation of the sealing element 40 fails.

[0067] In Comparative Example 4, the radial dimension L2 of the first sealing part 41 is too small, the second sealing part 42 is prone to cracking due to the "cantilever effect" when the edge is frozen and cut, the airtightness of the cover plate 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 and trimming, the freezing shrinkage rate is uneven, which leads to an increase in the internal stress gradient and makes it easy for hidden cracks to appear. The airtightness of the cover plate 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 located between the riveting member 20 and the cover plate 30 to ensure insulation between the riveting member 20 and the cover plate 30 and prevent short circuit between the riveting member 20 and the cover plate 30.

[0070] Optionally, the first insulating member 51 is provided with a receiving groove 512, and at least a portion of the riveting member 20 is embedded in the receiving groove 512. By providing the receiving groove 512, on the one hand, the positioning accuracy between the riveting member 20 and the first insulating member 51 can be improved, ensuring good assembly between the two; on the other hand, the size of the cover plate assembly 100 along the thickness direction of the cover plate 30 can be reduced, which is beneficial to improving the energy density of the battery.

[0071] Optionally, the cover plate 30 is provided with a first limiting groove 34 on the side 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 first limiting groove 34 can limit 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 quadrilateral.

[0073] Optionally, the cover plate assembly 100 further includes a second insulating member 52, which is disposed on the side of the cover plate 30 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 post 10 and the cover plate 30, thereby preventing short circuit between the substrate 12 and the cover plate 30.

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

[0076] Optionally, a third limiting groove 523 is provided on the side of the second insulating member 52 away from the cover plate 30, and at least a portion of the substrate 12 is disposed in the third limiting groove 523, so as to facilitate the positioning of the substrate 12 and the second insulating member 52, facilitate the installation of the electrode post 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 post portion 11 of the pole post 10 passes sequentially through the fifth mounting hole 411 of the seal 40, the fourth mounting hole 521 of the second insulator 52, the first mounting hole 31 of the cover plate 30, the third mounting hole 511 of the first insulator 51, and the second mounting hole 21 of the riveting member 20. After the post portion 11 of the pole post 10 passes through the second mounting hole 21, the post portion 11 of the pole post 10 is riveted to the riveting member 20. The base plate 12 abuts against the side of the second insulator 52 facing away from the cover plate 30, thereby assembling the pole post 10 onto the cover plate 30. The first limiting groove 34, the second limiting groove 522, and the third limiting groove 523 ensure high assembly accuracy between the pole post 10, the second insulator 52, the cover plate 30, the first insulator 51, and the riveting member 20, and reduce the size occupied by the cover plate assembly 100 in the thickness direction of the cover plate 30.

[0078] This application also provides a battery comprising a casing, an electrode assembly, and the aforementioned cover assembly 100. The casing has an opening, the electrode assembly is disposed within the casing, and the cover assembly 100 covers the opening of the casing. A riveting member 20 is connected to the electrode assembly, and the electrical energy generated by the electrode assembly can be transmitted to the main body of an external electrical device through the terminal post 10. By using the aforementioned cover assembly 100, the battery has better sealing and insulation effects, improving battery safety performance and extending service life.

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

[0080] Specifically, the main body of the electrical device can be a vehicle, mobile phone, portable device, household appliance, laptop, ship, spacecraft, electric toy, or power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles or hybrid electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, or electric planers, etc. This embodiment does not limit the main body of the aforementioned electrical device.

[0081] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device according to an embodiment of this application. A battery is installed inside the vehicle, and the battery can be located at the bottom, front, or rear of the vehicle. There can be one or more batteries, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple batteries are connected in both series and parallel configurations.

[0082] Batteries can be used to power vehicles; for example, they can serve as the vehicle's operating power source. Vehicles may also include controllers and motors, with the controllers controlling the battery's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving.

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

[0084] Note that in the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0085] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection 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 concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A cover plate assembly, comprising a cover plate (30), a pole (10), and a seal, said seal comprising: A first sealing portion (41) and a second sealing portion (42) extending axially, the second sealing portion (42) being disposed around the outer periphery of the first sealing portion (41) and located at one end of the first sealing portion (41) in the axial direction, so that the cross section of the sealing member is L-shaped; The second sealing part (42) has a radial dimension of L1 and an axial dimension of H1. The first sealing part (41) has a radial dimension of L2. The difference between the axial dimensions of the first sealing part (41) and the second sealing part (42) is H2, where L1 / H1≤3 and H2 / L2≤5. L1≥1mm, H1≥2.5mm; The cover plate (30) is characterized in that: the cover plate (30) has a first mounting hole (31), the pole post (10) passes through the first mounting hole (31), and the first sealing part (41) is sandwiched between the outer peripheral surface of the pole post (10) and the inner wall of the first mounting hole (31); the cover plate (30) is elongated, the pole post (10) has a dimension D1 along the length direction of the cover plate (30), and a dimension D2 along the width direction of the cover plate (30), where D1 ≥ D2; the cover plate assembly further includes a riveting member (20), the pole post (10) passes through the cover plate (30) and is connected to the riveting member (20); the cover plate assembly further includes a first insulating member (51), the first insulating member (51) is disposed between the riveting member (20) and the cover plate (30); and / or, the The cover plate assembly also includes a second insulating member (52), at least a portion of which is disposed between the cover plate (30) and the pole post (10); the pole post (10) includes a column portion (11) and a base plate (12), the column portion (11) is disposed on the base plate (12), the column portion (11) passes through the first mounting hole (31), the pole post (10) passes through the first mounting hole (31) from one side of the cover plate (30) and is connected to the riveting member (20), the cover plate (30) is sandwiched in the middle by the base plate (12) and the riveting member (20), the second sealing part (42) is sandwiched between the cover plate (30) and the base plate (12), the second sealing part (42) is sandwiched between the cover plate (30) and the base plate (12).

2. The cover plate assembly according to claim 1, characterized in that, L2≥0.5mm.

3. The cover plate assembly according to claim 1, characterized in that, The cover plate (30) is provided with a first limiting groove (34) on the side 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, the second insulating member (52) is provided with a second limiting groove (522) on the side facing the cover plate (30), and at least a portion of the cover plate (30) is disposed in the second limiting groove (522).

4. A battery, comprising a casing and an electrode assembly, characterized in that, It also includes a cover plate assembly as described in any one of claims 1-3, wherein the electrode group is disposed within the housing, the cover plate assembly is disposed on the housing, and the cover plate assembly is connected to the electrode group.

5. An electrical appliance, comprising an electrical appliance body, characterized in that, It also includes the battery as described in claim 4, the battery being configured to supply power to the main body of the electrical device.

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