Cover plate assembly, battery, electric device

Abstract

The disclosure provides a cover plate assembly, a battery and an electric device with the battery. The cover plate assembly comprises a cover plate and a pole. The cover plate comprises a body and a flange structure, the flange structure protrudes from the outer surface of the body and is sleeved on the outer periphery of the pole; the flange structure is provided with a chamfer close to the edge of the pole, the chamfer is located on the side of the edge away from the body, and the chamfer satisfies: 5 degree·mm≤m·n≤400 degree·mm. Wherein, m is the angle of the chamfer, the unit is degree, and n is the minimum distance between the edge and the pole, the unit is millimeter. m and n satisfy the above range, which not only can ensure that the cover plate and the pole have a larger creepage distance, reduce the risk of insulation failure between the cover plate and the pole; at the same time, it can also ensure that the flange structure has sufficient strength to realize the protection and fixing effect of the pole.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a cover plate assembly, a battery having the cover plate assembly, and an electrical device having the battery. Background Technology

[0002] Batteries, for example, are used to store and provide electrical energy, and are widely used in various devices. A battery typically consists of a casing and battery cells housed within the casing, which is then sealed by a cover to protect and secure the cells. The terminals of the battery cells protrude from the cover to establish electrical connections between cells or between a cell and an external circuit.

[0003] However, due to the small distance between the pole and the cover plate, there is a high risk of insulation failure between them. Utility Model Content

[0004] In view of this, the present disclosure provides a cover plate assembly, a battery, and an electrical device having the battery, which aims to at least improve the problem of insulation failure between the cover plate and the terminal post.

[0005] In a first aspect, this disclosure provides a cover plate assembly, which includes a cover plate and an electrode post. The cover plate includes a body and a flange structure, the flange structure protruding from the outer surface of the body and fitting around the outer periphery of the electrode post; the flange structure has a chamfer near the edge of the electrode post, the chamfer being located on the side of the edge opposite to the body, and the chamfer satisfying: 5 degrees·mm ≤ m·n ≤ 400 degrees·mm. Wherein, m is the angle of the chamfer in degrees, and n is the minimum distance between the edge and the electrode post in millimeters.

[0006] Secondly, this disclosure also provides a battery including the cover assembly described above.

[0007] Thirdly, this disclosure also provides an electrical device, including the battery described above.

[0008] According to the cover plate assembly, battery, and electrical equipment provided in this disclosure, a chamfer is provided at the edge of the flanged structure of the cover plate, and the angle of the chamfer satisfies 5 degrees·mm ≤ m·n ≤ 400 degrees·mm, where n is the minimum distance between the flanged structure and the terminal post. The fact that m and n satisfy the above range allows for an appropriate increase in the gap between the flanged structure and the terminal post, while preventing excessive removal of the flanged structure and ensuring sufficient strength. This not only ensures a large creepage distance between the cover plate and the terminal post, reducing the risk of insulation failure between them, but also ensures sufficient strength of the flanged structure to protect and secure the terminal post. Attached Figure Description

[0009] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0010] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0011] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0012] Figure 1 This is a schematic diagram of an exemplary cover plate assembly.

[0013] Figure 2 for Figure 1 Top view.

[0014] Figure 3 For along Figure 2 A cross-sectional view taken along line AA.

[0015] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0016] Explanation of reference numerals in the attached drawings: 10, cover plate; 11, body; 12, flange structure; 20, pole post; 21, first step surface; 22, second step surface; 30, explosion-proof valve; 40, liquid injection port; 50, insulation structure. Detailed Implementation

[0017] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0018] In related technologies, the flanged structure of the cover plate forms a hole through which the terminal post passes, protruding from the cover plate to achieve electrical connection between batteries or between a battery and an external circuit. However, the gap between the terminal post and the flanged structure is relatively small, meaning the insulation distance between them is short. Consequently, during battery production or processing, short circuits can easily occur between the flanged structure and the terminal post, causing insulation failure.

[0019] For example, during battery assembly, metal particles or shavings from the environment may fall into the gap between the flange structure and the terminals; or, during the injection of electrolyte into the battery through the filling port, electrolyte may be accidentally spilled into the gap between the flange structure and the terminals; or, during battery use, changes in ambient temperature or internal battery temperature may cause condensation to drip into the gap between the flange structure and the terminals. All of these scenarios can significantly increase the likelihood of a short circuit between the flange structure and the terminals.

[0020] The inventors discovered that the cause of the above problems is that the gap between the pole and the flange structure is small, resulting in a small creepage distance between the pole and the flange structure.

[0021] To address the aforementioned problems, the inventors made numerous attempts and ultimately creatively proposed the following technical solution: By setting a chamfer at the edge of the flanged structure of the cover plate, and ensuring that the chamfer angle satisfies 5 degrees·mm ≤ m·n ≤ 400 degrees·mm, where n is the minimum distance between the flanged structure and the pole. Meeting the above range for m and n appropriately increases the gap between the flanged structure and the pole without excessively removing the portion of the flanged structure, thus ensuring sufficient strength. This not only ensures a large creepage distance between the cover plate and the pole, reducing the risk of insulation failure, but also ensures sufficient strength of the flanged structure to protect and secure the pole.

[0022] <Example Cover Plate Assembly>

[0023] This disclosure provides a cover assembly including a cover plate 10, an electrode post 20, an explosion-proof valve 30, and an electrolyte inlet 40. It is readily understood that the cover plate 10 is used to seal the battery's housing space (such as a casing), placing the battery in a relatively sealed space to prevent environmental contaminants or moisture from entering the battery. The cover plate 10 has holes through which the electrode post 20 passes, with its end exposed outside the cover plate 10 for electrical connection to adjacent batteries or external circuits. In the event of thermal runaway, the explosion-proof valve 30 can be used to quickly release heat and gas from the casing to prevent the battery from exploding due to excessive pressure or temperature. The electrolyte inlet 40 is mainly used during battery manufacturing to inject electrolyte into the battery.

[0024] For ease of understanding, the cover plate assembly described in this disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, the direction indicated by the X-axis may be, for example, the length direction of the cover plate assembly, that is, the length direction of the body 11; the direction indicated by the Y-axis may be, for example, the width direction of the cover plate assembly, that is, the width-length direction of the body 11; and the direction indicated by the Z-axis may be, for example, the height direction of the cover plate assembly, that is, the height direction of the body 11.

[0025] See Figures 1 to 4 The cover plate 10 includes a body 11 and a flange structure 12. The flange structure 12 protrudes from the outer surface of the body 11 and is fitted around the outer periphery of the pole post 20.

[0026] This is merely an example, but not limited to. For example, taking a square-shell battery as an example: the cover plate 10 can be set as a rectangle or square to fit the casing of the square-shell battery. The overall outline of the cover plate 10, for example, constitutes the body 11. The side of the body 11 facing the casing can be understood as the inner surface of the body 11, for example, and the side of the body 11 away from the casing can be understood as the outer surface of the body 11.

[0027] The flange structure 12 protrudes from the outer surface of the body 11, that is, in the height direction of the body 11, the flange structure 12 is higher than the outer surface of the body 11. A hole is formed through the body 11 along the height direction for the pole post 20 to pass through, and the flange structure 12 is arranged around the hole.

[0028] For details, see Figure 3 and Figure 4 In the height direction of the body 11, the flange structure 12 can extend upward from the outer surface of the body 11 by a certain distance, and then extend towards the hole by a certain distance, thereby forming a flange structure 12 surrounding the hole. That is, the flange structure 12 will be fitted around the periphery of the pole post 20, and the end of the pole post 20 away from the body 11 will be exposed outside the flange structure 12 to facilitate the electrical connection of the pole post 20.

[0029] The flange structure 12 protrudes from the outer surface of the body 11. In the height direction of the cover plate assembly, the height of the flange structure 12 can be closer to the height of the pole post 20, so as to better fix and support the pole post 20. At the same time, the flange structure 12 extends a certain distance towards the hole, which can further improve the limiting effect on the pole post 20, so as to further ensure the stability of the pole post 20.

[0030] See also Figure 3 and Figure 4The flange structure 12 has a chamfered edge near the pole post 20, and the chamfer is located on the side of the edge facing away from the body 11. For example, the chamfer is located on the upper side of the edge. Providing a chamfer at this edge position of the flange structure 12 can increase the gap between the flange structure 12 and the pole post 20 to a certain extent, thereby reducing the risk of insulation failure between the flange structure 12 and the pole post. At the same time, providing a chamfer at this edge can also prevent the edge of the flange structure 12 from being too sharp and causing damage to the pole post 20, etc., during assembly.

[0031] It is understood that the terminal 20 may include, for example, a positive terminal and a negative terminal, and the body 11 is provided with holes for the positive and negative terminals to pass through, respectively. That is, the flange structure 12 is provided in conjunction with the terminal 20. In use, the shape and number of the flange structure 12 can be adaptively adjusted according to the shape and number of the terminal 20. This application does not impose specific limitations on it.

[0032] Furthermore, the chamfer satisfies the following relationship:

[0033] 5 degrees·mm ≤ m·n ≤ 400 degrees·mm

[0034] Where m is the chamfer angle in degrees, and n is the minimum distance between the edge and the pole post 20 in millimeters. n can be understood as the distance between the point closest to the pole post 20 on the edge of the flange structure 12 near the pole post 20 and the outer surface of the pole post 20 in the direction parallel to the body 11.

[0035] Satisfying the above relationship between m and n not only ensures the insulation effect between the flange structure 12 and the pole post 20, but also ensures the fixing and supporting effect of the flange structure 12 on the pole post 20. This avoids the problem of insufficient creepage distance and easy insulation failure between the flange structure 12 and the pole post 20 when the m·n range is too small; it also avoids the problem of insufficient strength of the flange structure 12 when the m·n range is too large, resulting in the cover plate 10 failing to effectively fix the pole post 20.

[0036] Optionally, the range of values ​​for the above relationship can be 10°·mm-380°·mm, 50°·mm-350°·mm, 80°·mm-320°·mm, 100°·mm-300°·mm, 120°·mm-280°·mm, 150°·mm-260°·mm, 160°·mm-250°·mm, 180°·mm-220°·mm, or 200°·mm-210°·mm, etc. In use, the range of the above relationship can be adaptively adjusted according to factors such as the dimensions of the flange structure 12 and the pole post 20, and is not limited to the ranges listed above.

[0037] Preferably, the value of m ranges from 10° to 80°. Within this range, the chamfer angle is large enough to ensure a large creepage distance between the flange structure 12 and the pole post 20, reducing the risk of short circuits between them. On the other hand, it avoids an excessively large chamfer angle, preventing excessive thinning of the flange structure 12. This ensures that the edge of the flange structure 12 has sufficient strength to provide good fixation and support for the pole post 20.

[0038] For example, m can be 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, or 75°, etc. During use, the angle can be adjusted adaptively according to factors such as the material or strength of the flange structure 12, and is not limited to the angles listed above.

[0039] More preferably, the value of n is in the range of 0.5mm-5mm. The distance between the flange structure 12 and the pole post 20 is within the above range. On the one hand, this ensures sufficient distance between the flange structure 12 and the pole post 20 to guarantee their insulation effect. On the other hand, it prevents the distance between the flange structure 12 and the pole post 20 from being too large, ensuring that the flange structure 12 can better limit the position of the pole post 20 and better fix it.

[0040] For example, n can be 0.6mm, 0.8mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 3.6mm, 4.0mm, or 4.5mm, etc. During use, the distance between the flange structure 12 and the pole post 20 can be adaptively adjusted according to factors such as the dimensions of the flange structure 12 and the pole post 20, and is not limited to the distances listed above.

[0041] See also Figure 3 and Figure 4 The end of the electrode post 20 furthest from the body 11 has a first stepped surface 21 and a second stepped surface 22. This end of the electrode post 20 furthest from the body 11 can be understood as the end that needs to be electrically connected to an adjacent battery or external circuit. The first stepped surface 21 surrounds the second stepped surface 22; that is, the first stepped surface 21 is closer to the flange structure 12 than the second stepped surface 22. For example, the electrical connection of the electrode post 20 can be achieved through the second stepped surface 22.

[0042] In the direction perpendicular to the body 11, that is, in the height direction of the body 11, the first step surface 21 is higher than the flange structure 12. In other words, in the height direction of the body 11, the first step surface 21 is higher than the upper surface of the flange structure 12. This causes the flange structure 12 and the upper surface of the first step surface 21 to be on different horizontal planes, increasing the creepage distance between the flange structure 12 and the pole post 20, at least in the height direction of the body 11. This further improves the insulation effect between the flange structure 12 and the pole post 20.

[0043] Preferably, the height difference between the first step surface 21 and the flange structure 12 ranges from 0.05mm to 0.5mm. The height difference between the first step surface 21 and the flange structure 12 can be understood, for example, as the distance between the first step surface 21 and the upper surface of the flange structure 12. For example, as... Figure 4 The distance h in the figure represents the height difference between the first step surface 21 and the flange structure 12. The height difference between the first step surface 21 and the flange structure 12 satisfies the above-mentioned range, which on the one hand increases the creepage distance between the flange structure 12 and the terminal post 20; on the other hand, it prevents the height of the first step surface 21 from being too high, thus avoiding increasing the height of the battery and adversely affecting the energy density of the battery.

[0044] The height difference between the first step surface 21 and the flange structure 12 can be, for example, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, or 0.45mm. In use, the height difference between the first step surface 21 and the flange structure 12 can be adaptively adjusted according to factors such as the dimensions of the flange structure 12 and the pole post 20, and is not limited to the distances listed above.

[0045] Furthermore, in the direction perpendicular to the body 11, the second step surface 22 is higher than the first step surface 21. That is, in the height direction of the body 11, the second step surface 22 is higher than the first step surface 21. In this way, the first step surface 21 can form a certain clearance space to facilitate the installation of an insulating protective plate (not shown in the figure) above the body 11 to achieve insulation between the cover plate 10 and the outside world. At the same time, it can also balance the processing errors of the insulating protective plate to a certain extent and avoid collision between the insulating protective plate and the second step surface 22.

[0046] Meanwhile, the second step surface 22 is higher than the first step surface 21, which also facilitates the welding of the second step surface 22 with conductors such as copper or aluminum sheets to achieve electrical connection between the electrode post 20 and adjacent batteries or external circuits.

[0047] In one optional embodiment, the height difference between the second step surface 22 and the first step surface 21 ranges from 0.1mm to 3mm. This height difference satisfies two conditions: firstly, it ensures a sufficient height difference between the two surfaces, preventing mutual interference and facilitating both the installation of the insulating protective plate and electrical connection of the second step surface 22; secondly, it prevents an excessively large height difference, thus avoiding a significant increase in battery height and negatively impacting battery energy density.

[0048] The height difference between the second step surface 22 and the first step surface 21 can be, for example, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, or 2.8mm. During use, the height difference between the second step surface 22 and the first step surface 21 can be adaptively adjusted according to factors such as the battery size, and is not limited to the height differences listed above.

[0049] Furthermore, in the direction parallel to the body 11, the width of the first step surface 21 ranges from 0.1mm to 3mm. The width of the first step surface 21 can be understood, for example, as the straight-line distance from the outer side of the first step surface 21 to the outer side of the second step surface 22.

[0050] The width of the first step surface 21 meets the above-mentioned range, which not only forms an effective clearance space to balance the error of the insulating protective plate and avoid mutual interference between the insulating protective plate and the second step surface 22, but also allows the second step surface 22 to have a sufficiently large radial dimension, ensuring that its electrical connection has sufficient current-carrying area and ensuring a safe and stable electrical connection of the pole 20.

[0051] Optionally, the width of the first step surface 21 can be, for example, 0.2mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, or 2.8mm. In use, the width of the first step surface 21 can be determined comprehensively based on factors such as the radial dimension of the pole post 20 and the error range of the insulating protective plate, and is not limited to the widths listed above.

[0052] like Figure 3 or Figure 4As shown, an insulating structure 50 is provided between the flange structure 12 and the pole post 20 to further improve the insulation effect between the flange structure 12 and the pole post 20. The insulating structure 50 may extend a certain distance in the height direction of the cover plate assembly, for example, to more fully insulate the flange structure 12 and the pole post 20.

[0053] In one alternative embodiment, the insulating structure 50 is an insulating adhesive disposed between the flange structure 12 and the pole post 20. For example, the insulating adhesive can be applied to the surface of the pole post 20 facing the flange structure 12; or the insulating adhesive can also be applied to the surface of the flange structure 12 facing the pole post 20. This achieves insulation between the flange structure 12 and the pole post 20.

[0054] Taking the example of insulating adhesive covering the surface of the pole 20 facing the flange structure 12: In this case, there can be a certain distance between the insulating adhesive and the flange structure 12 in the direction parallel to the body 11. That is to say, the surface of the flange structure 12 facing the pole 20 does not contact the outer surface of the insulating adhesive. On the one hand, this can increase the creepage distance between the flange structure 12 and the pole 20; on the other hand, it can also prevent the flange structure 12 from squeezing the insulating adhesive, which would have an adverse effect on the insulating effect of the insulating adhesive. Similarly, when the insulating adhesive is covered on the surface of the flange structure 12 facing the pole 20, a similar arrangement can be made, which will not be elaborated here.

[0055] Optionally, the insulating adhesive can be made of materials such as epoxy resin, polyurethane, polyacrylate, or silicone polymer.

[0056] Furthermore, the end of the insulating adhesive away from the body 11 is flush with or protrudes from the first step surface 21.

[0057] In other words, in the height direction of the body 11, the upper surface of the insulating adhesive is flush with the first step surface 21; or, the upper surface of the insulating adhesive is higher than the first step surface 21. Thus, the insulating adhesive can more fully exert its insulating effect on the flange structure 12 and the pole post 20.

[0058] It should be noted that when the upper surface of the insulating adhesive is higher than the first step surface 21, the upper surface of the insulating adhesive must not be higher than the second step surface 22. This is to avoid the insulating adhesive interfering with the electrical connection of the second step surface 22. Preferably, the portion of the insulating adhesive that protrudes above the first step surface 21 can be bent towards the first step surface 21 so that this portion covers the first step surface 21, thereby further improving the insulation effect between the flange structure 12 and the pole post 20.

[0059] Alternatively, the insulating structure 50 may be an insulating coating disposed between the flange structure 12 and the pole post 20. For example, the insulating coating may be sprayed on the surface of the pole post 20 facing the flange structure 12; or the insulating coating may also be sprayed on the surface of the flange structure 12 facing the pole post 20. This achieves insulation between the flange structure 12 and the pole post 20.

[0060] Taking the application of an insulating coating on the surface of the pole 20 facing the flange structure 12 as an example: In this case, there can be a certain distance between the insulating coating and the flange structure 12 in the direction parallel to the body 11. That is, the surface of the flange structure 12 facing the pole 20 does not contact the outer surface of the insulating coating. On the one hand, this increases the creepage distance between the flange structure 12 and the pole 20; on the other hand, it also prevents the flange structure 12 from squeezing the insulating coating, which would adversely affect the insulating effect of the coating. Similarly, a similar arrangement can be made when the insulating coating is applied to the surface of the flange structure 12 facing the pole 20, which will not be elaborated further here.

[0061] Optionally, the insulating coating may be, for example, an epoxy coating, a polyurethane coating, a polyacrylate coating, a silicone polymer coating, or a metal oxide coating.

[0062] The end of the insulating coating furthest from the body 11 is flush with or protrudes from the first step surface 21. That is, in the height direction of the body 11, the upper surface of the insulating coating is flush with the first step surface 21; or, the upper surface of the insulating coating is higher than the first step surface 21. Thus, the insulating coating can more fully exert its insulating effect on the flange structure 12 and the pole post 20.

[0063] It should be noted that when the upper surface of the insulating coating is higher than the first step surface 21, the upper surface of the insulating coating must not be higher than the second step surface 22. This is to avoid the insulating coating interfering with the electrical connection of the second step surface 22. Preferably, an insulating layer can also be sprayed onto the first step surface 21 to further improve the insulation effect between the flange structure 12 and the pole post 20.

[0064] <Example Battery>

[0065] This disclosure also provides a battery including the cover assembly described above. This battery can be understood, for example, as an energy storage unit capable of repeated charging and discharging, and can be interpreted as a "secondary battery." The battery can be, for example, a lithium-ion secondary battery, a sodium-ion secondary battery, a lead-acid battery, or a nickel-metal hydride battery.

[0066] <Example Electrical Equipment>

[0067] This disclosure also provides an electrical device, including the battery described above. This electrical device can be, for example, a vehicle, ship, aircraft, household appliance, industrial equipment, or energy storage device. The vehicle can be, for example, a passenger car, a truck, or a construction vehicle.

[0068] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0069] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part is not intended to exclude other components or parts.

[0070] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as a first step surface and a second step surface), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0071] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0072] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A cover plate assembly, characterized in that, Includes a cover plate (10) and a pole post (20); The cover plate (10) includes a body (11) and a flange structure (12), the flange structure (12) protruding from the outer surface of the body (11) and sleeved on the outer periphery of the pole post (20); The flange structure (12) has a chamfer on the edge near the pole post (20), the chamfer is located on the side of the edge away from the body (11), and the chamfer satisfies: 5 degrees·mm ≤ m·n ≤ 400 degrees·mm Where m is the angle of the chamfer in degrees, and n is the minimum distance between the edge and the pole post (20) in millimeters.

2. The cover plate assembly as claimed in claim 1, characterized in that, The end of the pole post (20) away from the body (11) has a first stepped surface (21); In the direction perpendicular to the body (11), the first step surface (21) is higher than the flange structure (12), and the height difference between the first step surface (21) and the flange structure (12) ranges from 0.05mm to 0.5mm.

3. The cover plate assembly as claimed in claim 2, characterized in that, The end of the pole post (20) away from the body (11) has a second stepped surface (22); In a direction perpendicular to the body (11), the second step surface (22) is higher than the first step surface (21), and the first step surface (21) surrounds the second step surface (22).

4. The cover plate assembly as claimed in claim 3, characterized in that, The height difference between the second step surface (22) and the first step surface (21) ranges from 0.1mm to 3mm, and / or In the direction parallel to the body (11), the width of the first step surface (21) ranges from 0.1 mm to 3 mm.

5. The cover plate assembly as claimed in claim 2, characterized in that, It also includes insulating adhesive, which is disposed between the flange structure (12) and the pole post (20); The end of the insulating adhesive away from the body (11) is flush with or protrudes from the first step surface (21).

6. The cover plate assembly as claimed in claim 2, characterized in that, It also includes an insulating coating disposed between the flange structure (12) and the pole post (20); The end of the insulating coating away from the body (11) is flush with or protrudes from the first step surface (21).

7. The cover plate assembly as claimed in claim 1, characterized in that, The value of m ranges from 10° to 80°.

8. The cover plate assembly as claimed in claim 1, characterized in that, The value of n ranges from 0.5mm to 5mm.

9. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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