Cover plate assembly and electric equipment

Abstract

The invention relates to the technical field of power batteries, and provides a cover plate assembly and electric equipment. The cover plate assembly comprises a cover plate capable of integrating an explosion-proof valve and a pole, and an insulating part arranged on the cover plate, pole columns are arranged on the two sides of the anti-explosion valve. The insulating piece comprises a main body part, an abutting part and a bending part. The abutting part is bent relative to the main body part through the bent part, the bent abutting part abuts against the side, opposite to the cover plate, of the main body part, and the abutting part is provided with an air hole and a cavity. The cover plate assembly disclosed by the invention is applied to the power battery, can be used for shaping and fixing the tab, and can be used for well preventing the welding slag of the pole and the tab from puncturing the diaphragm, the air hole corresponding to the anti-explosion valve is arranged, so that the reliability of the anti-explosion valve is improved, and the cavity is arranged, so that enough space for covering the welding part of the pole and the tab can be provided.

Description

Technical Field

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

[0002] A power battery primarily consists of a housing and a pole group housed within it. The housing comprises a main body that encloses a mounting cavity and a cover plate assembly. Welding the pole tabs on the pole group to the pole posts on the cover plate is a critical process, and the quality of this weld directly impacts the safety and performance of the power battery.

[0003] Specifically, the electrode group includes a positive electrode sheet, a negative electrode sheet, and a diaphragm that insulates the positive and negative electrode sheets. Among them, the diaphragm is a key component that separates the positive and negative electrodes in the battery.

[0004] During the application of power batteries, for example, when they are used in vehicles, when the vehicle suddenly encounters a collision, the electrode group may move up and down. In this case, the welding slag formed by the welding of the tabs and the poles may puncture the diaphragm, causing the positive and negative electrodes to directly contact and form a short circuit.

[0005] The high temperatures generated by a short circuit can trigger a chain reaction within the battery, such as decomposition of the electrolyte and electrode materials, potentially leading to thermal runaway. Thermal runaway can not only damage the battery but also pose a threat to the surrounding environment and personnel safety. Summary of the Invention

[0006] In view of this, the present invention aims to provide a cover plate assembly, which is applied to a power battery to improve the safety and reliability of the power battery.

[0007] To achieve the above object, the technical solution of the present invention is achieved as follows: A cover plate assembly comprises a cover plate capable of being integrated with an explosion-proof valve and a pole, and an insulating member provided on the cover plate; The cover plate is in an elongated strip shape, and the explosion-proof valve is located in the middle of the cover plate, and the poles are provided on both sides of the explosion-proof valve; The insulating member includes a main body portion provided on one side of the cover plate and arranged in accordance with the shape of the cover plate, a pressing portion located at one end of the main body portion in the length direction before being bent, and a bending portion connecting the main body portion and the pressing portion; The main body, the bent portion, and the abutting portion are integrally formed, the abutting portion is bent relative to the main body by the bent portion, and the bent abutting portion abuts against a side of the main body facing away from the cover plate and is snap-connected to the main body; The pressing portion is provided with air holes corresponding to the explosion-proof valves, and cavities corresponding to the poles one by one, and each of the cavities is recessed toward a side away from the cover plate.

[0008] Furthermore, the main body portion is provided with a buckle, and the pressing portion is provided with a snap-fitting hole, and the buckle can be snapped into the snap-fitting hole to connect the main body portion and the pressing portion.

[0009] Furthermore, the buckle has a connecting portion connected to the main body, and a clamping portion protruding toward the outside of the connecting portion along the radial direction of the buckle; The clamping hole comprises a first clamping hole suitable for the connecting portion to be embedded, and a second clamping hole suitable for the clamping portion to be embedded.

[0010] Furthermore, the buckle includes a plurality of sub-buckles spaced apart along the center line of the buckle, each of the sub-buckles having a sub-connecting block connected to the main body, and a sub-clamping block protruding outward of the sub-connecting block along the radial direction of the buckle; A plurality of the sub-connecting blocks are embedded in the first clamping hole together, and a plurality of the sub-clamping blocks are embedded in the second clamping hole together.

[0011] Furthermore, the number of the sub-buckles is four and they are spaced apart along the circumference of the clamping hole; and / or, The distance W between two adjacent sub-buckles is between 1.2 mm and 1.8 mm.

[0012] Furthermore, the engagement length W1 of each of the sub-clamping blocks and the abutting portion in the radial direction of the engagement hole is between 0.35 mm and 0.65 mm, and the engagement area between each of the sub-clamping blocks and the abutting portion is between 0.25 mm and 0.65 mm. 2 -1.5 mm 2 between; and / or, The thickness P of each of the sub-clamping blocks in the axial direction of the clamping hole is between 0.6 mm and 4.5 mm.

[0013] Furthermore, a boss is provided on the main body portion, and the engaging hole is provided at the boss and passes through the pressing portion; after engaging, the pressing portion presses against the main body portion through the boss.

[0014] Furthermore, the pressing portion has local areas respectively arranged corresponding to each of the poles, and edge areas extending outward from the local areas; each of the cavities is formed by the corresponding local areas being recessed toward a side away from the main body portion, and the local areas and the edge areas are connected by connecting ribs, and the connecting ribs are multiple and arranged at circumferential intervals along the local areas.

[0015] Furthermore, the length L of the connecting rib is between 3.0 mm and 10 mm, the width W of the connecting rib is between 0.5 mm and 5 mm, and the width G of the gap between adjacent connecting ribs is between 0.8 mm and 3.0 mm; and / or the bottom wall area S of the cavity is between 6 mm 2 -300mm 2 between.

[0016] Compared with the prior art, the present invention has the following advantages: (1) The cover plate assembly described in the present application is such that the insulating member includes a main body located on one side of the cover plate and a pressing portion located at one end of the main body in the longitudinal direction. The pressing portion is pressed against the side of the main body facing away from the cover plate, which can better fix the tab and play a role in shaping the tab. The pressing portion can be placed on the side of the corresponding tab facing away from the cover plate. When used in a power battery, it can better prevent the welding slag of the pole and the tab from puncturing the diaphragm. The air vent provided corresponding to the explosion-proof valve is conducive to improving the reliability of the explosion-proof valve. The cavity provided can provide sufficient space to cover the welding part of the pole and the tab, which can further prevent the diaphragm from being punctured, further reduce the risk of puncturing the diaphragm, and improve the safety and reliability of the power battery. The pressing portion is connected to the main body through the bending portion, so that the pressing portion can be bent relative to the main body through the bending portion, and it is easy to ensure the degree of fit between the pressing portion and the main body.

[0017] The clamping part is connected to the main part by snapping, which is a quick connection method. Compared with traditional threaded connections, welding, etc., it does not require complicated tools and operating procedures, and can be reused many times through reasonable design. With the snap-in method, after the clamping part is aligned with the main part, the assembly can be completed with a light push or press, which can greatly improve production efficiency. When it is necessary to disassemble, repair or replace the clamping part, it is also only necessary to apply a certain external force to release the snap-in relationship, and the clamping part can be easily removed, which is convenient and quick. Since the snap-in operation is simple and easy to learn, and the skill requirements for the operator are low, the company does not need to invest a lot of time and cost in professional training for employees, which allows the company to arrange production personnel more flexibly and reduce labor costs. At the same time, the rapid assembly and disassembly process can also shorten the production cycle, improve the utilization rate of equipment, and thus further reduce production costs.

[0018] (2) The buckle is provided on the main body and a snap-in hole is provided on the pressing part. When the buckle is placed in the snap-in hole, a tight fit is formed between the two. Reasonable buckle and snap-in hole design can provide sufficient friction and mechanical locking force to ensure that the main body and the pressing part will not be easily separated when subjected to normal external forces.

[0019] (3) The clip includes a clipping portion and a connecting portion. Since the clipping portion protrudes radially toward the outside of the connecting portion of the clip, and the clipping hole includes a first clipping hole suitable for embedding the connecting portion, and a second clipping hole suitable for embedding the clipping portion, the apertures of the first clipping hole and the second clipping hole are different, and the aperture of the first clipping hole is smaller than that of the second clipping hole. When the connecting portion is embedded in the first clipping hole and the clipping portion is clipped in the second clipping hole, the clip can be firmly fixed in the clipping hole, which is beneficial to improving the reliability of the clip connection between the main body part and the pressing part.

[0020] (4) The buckle includes a plurality of sub-buckles, each of which includes a sub-buckle block and a sub-connecting block. The plurality of sub-buckle blocks together constitute the clamping portion, and the plurality of sub-connecting blocks together constitute the connecting portion. When the buckle is clamped in the clamping hole, the plurality of sub-buckle blocks are offset toward the center line of the buckle together, so that the clamping hole can be smoothly clamped into the clamping hole. The clamping process is convenient, and after the clamping is completed, the sub-buckle blocks are reset under the action of their respective sub-connecting blocks, so that the buckle can be firmly clamped in the clamping hole, and the reliability and stability of the clamping are high.

[0021] (5) The number of sub-clip buckles is limited to four, which is convenient for processing and helps to ensure the reliability and stability of the clip in the clip hole. The spacing between two adjacent sub-clip buckles is limited, so that there is sufficient deformation space when the clip is assembled in the clip hole, and the reliability and stability of the clip in the clip hole can be better guaranteed.

[0022] (6) The clamping length W1 of each clamping block and the pressing part in the radial direction of the clamping hole is set between 0.35mm and 0.65mm, which can not only lock the clamping block firmly in the clamping hole, but also facilitate the quick insertion and removal of the clamping block. The buckling area between each clamping block and the pressing part is limited to 0.25mm 2 -1.5 mm 2 The thickness P of each clamping block in the axial direction of the clamping hole is set between 0.6mm and 4.5mm, which can ensure that the clamping block maintains rigidity when subjected to the pressure of the tab, while avoiding the disadvantage of lightweight design due to excessive thickness, and can also improve the reliability of the clamping structure.

[0023] (7) By providing a boss on the abutting portion and providing a snap-fit ​​hole on the boss and penetrating the abutting portion, the thickness of the snap-fit ​​hole can be increased. When the main body portion and the abutting portion are snap-fitted together, such a structure can improve the stability and reliability of the connection between the two.

[0024] (8) The local area is recessed toward the side away from the cover plate to form a cavity. The structure is simple, the processing is convenient, and the material consumption is small. When the electrode assembly is used in a power battery, the local area is convenient to press against the electrode group in the power battery, which can limit the position of the electrode group and help attenuate the vibration of the electrode group. The local area and the edge area are connected by connecting ribs, and the other parts are disconnected. This can ensure sufficient elasticity and strength of the local area and buffer the up and down movement of the electrode group to the maximum extent. In addition, the local area is limited to the edge through the connecting ribs, and the adjacent connecting ribs are connected to form a gap, which allows the electrolyte to flow through the gap. In addition, this connection method is also conducive to the vibration of the local area, and the material consumption is also small, which is conducive to cost saving.

[0025] (9) Limit the length and width of the connecting ribs and the width of the gaps between adjacent connecting ribs so that the local area can produce the maximum buffering effect on the electrode group, thereby improving the overall safety of the power battery. Limiting the bottom wall area of ​​the cavity can ensure that the local area has sufficient contact area with the electrode group, preventing the area from being too small and causing excessive local pressure and damaging the electrode group.

[0026] Another object of the present invention is to provide an electrical device, wherein a power battery in the electrical device is provided with the cover plate assembly as described above.

[0027] The electrical equipment described in the present invention, by applying the above cover plate assembly on its power battery, has the same beneficial effects as the aforementioned cover plate assembly relative to the prior art, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of an exemplary structure of the cover plate assembly according to an embodiment of the present invention in an application state; Figure 2 This is an exemplary structural diagram of the assembly process of the cover plate assembly and the electrode group according to an embodiment of the present invention; Figure 3 for Figure 1 Schematic diagram of the structure from another perspective; Figure 4 For the Figure 3 Cross-sectional view along line AA; Figure 5 for Figure 4 An enlarged view of part I; Figure 6 for Figure 5 Magnified view of part C; Figure 7 For the Figure 3Cross-sectional view along the midline BB; Figure 8 for Figure 7 Magnified view of the D part; Figure 9 for Figure 2 Schematic diagram of the structure of the middle tightening part before bending; Figure 10 This is a schematic diagram of an exemplary structure of an insulating member according to an embodiment of the present invention; Figure 11 for Figure 10 Schematic diagram of the structure from another perspective; Figure 12 This is another exemplary structural diagram of an insulating member according to an embodiment of the present invention; Figure 13 for Figure 12 Schematic diagram of the structure from another perspective; Figure 14 This is a schematic diagram of an exemplary structure of a buckle according to an embodiment of the present invention; Figure 15 for Figure 13 A magnified view of part E; Figure 16 This is a schematic diagram of an exemplary structure of the bending portion described in an embodiment of the present invention.

[0029] Description of reference numerals: 1. Cover plate; 2. Insulation; 3. Pole group; 101, pole; 201. Main body; 202. Abutting portion; 203. Bending portion; 2011, buckle; 2012, first mounting hole; 2013, second mounting hole; 20111, split buckle; 20112, split card connecting block; 20113, split connecting block; 2021, local area; 2022, edge area; 2023, cavity; 2024, snap-in hole; 2025, connecting rib; 2026, through hole; 2027, vent hole; 2028, boss; 20241, first card hole; 20242, second card hole; 2031, glue reduction groove; 2032, opening; 301. Extreme ears. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0031] In the description of the present invention, it should be noted that if terms such as "upper," "lower," "inner," and "outer" appear to indicate orientation or positional relationships, these are based on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, if terms such as "first" and "second" appear, they are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0032] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] Within the battery manufacturing process, the welding process between the tab and the cover plays a crucial role, being one of the core steps that determine the final quality of the battery. The quality of this welding process is closely and directly correlated with the safety and electrochemical performance of the battery. Its quality plays a decisive role in the battery's ability to operate stably and safely in complex and changing operating environments.

[0035] A deeper analysis of the battery's internal microstructure reveals that the separator, a key functional component that effectively separates the positive and negative electrodes within the battery, possesses material properties and structural integrity that are crucial to the battery's safe and stable operation. Typically made of insulating materials with a specific porosity and mechanical strength, the separator's function is to strictly prevent direct contact between the positive and negative electrodes while ensuring normal ion transmission, thereby maintaining the orderly electrochemical reactions within the battery.

[0036] However, during the welding process between the tab and the electrode cap, slag is easily generated at the welding site due to factors such as slight fluctuations in welding process parameters (such as welding current, welding time, welding pressure, etc.), precision deviations in welding equipment, and differences in operator skills. The shape, size, and distribution of this slag are uncertain, and it may appear in the weld area in the form of tiny particles, flakes, or irregular shapes.

[0037] During subsequent battery assembly, transportation, or use, if the battery falls off or shifts due to minor internal vibrations, stress changes, or external impacts, welding slag is very likely to physically puncture the separator. Once the separator is punctured by welding slag, the separation between the positive and negative electrodes that is originally maintained by the separator is broken, and the positive and negative electrodes will come into direct electrical contact, resulting in a short circuit.

[0038] Furthermore, after the tabs are welded to the poles, they cannot be effectively gathered together, making them susceptible to reverse insertion into the electrode stack. This increases the risk of puncturing the diaphragm, impacting the safety and performance of the power battery. Existing power batteries lack a buffer structure, creating the risk of tab tearing.

[0039] When a short circuit occurs, a very large short-circuit current flows through the battery in a very short period of time. This high current, driven by the battery's internal resistance, rapidly generates a large amount of heat, causing the battery's internal temperature to rise sharply. This high temperature triggers a complex chain of chemical reactions within the battery. First, the electrolyte within the battery decomposes under the influence of high temperatures. Electrolytes are typically composed of organic solvents and lithium salts, and their decomposition products may include gases (such as carbon dioxide, carbon monoxide, and hydrogen), solid particles, and corrosive chemicals. This electrolyte decomposition not only alters the chemical balance within the battery, leading to a decrease in electrochemical performance, but also generates gases that rapidly increase internal pressure, increasing the risk of bulging, deformation, and even rupture.

[0040] At the same time, the battery's positive and negative electrode materials also decompose under high temperature conditions. Positive electrode materials (such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate) and negative electrode materials (such as graphite and silicon-based materials) undergo structural phase transitions and redox reactions at high temperatures, leading to the destruction of the electrode materials' crystal structure and loss of active substances. This, in turn, irreversibly reduces the battery's capacity and deteriorates its charge and discharge performance.

[0041] As the above-mentioned chain chemical reaction continues, the temperature inside the battery will continue to rise, which may eventually trigger thermal runaway of the battery. Thermal runaway is an extremely destructive battery failure mode, which is manifested by a sharp rise in temperature and pressure inside the battery. The battery casing may rupture, burn, or even explode. The thermal runaway of the battery will not only cause the battery itself to be completely damaged and lose its use value, but the flames, high temperatures generated by its combustion, and the shock waves and fragments generated by the explosion may also cause serious damage to the surrounding environmental facilities, posing a direct threat to the life safety of operators and surrounding personnel. This embodiment relates to a cover plate assembly, In order to improve the safety performance of the battery, this embodiment relates to a cover plate assembly, which can shape the assembled pole tabs by improving the structure of the insulating parts on the cover plate, thereby reducing the risk of the pole tabs being inserted into the pole group, and reducing the risk of welding slag between the pole tabs and the poles puncturing the diaphragm in the pole group, thereby improving the safety and reliability of power battery applications.

[0042] Based on the above design concept, the exemplary structure of the cover assembly in the application state of this embodiment is as follows: Figures 1 to 9 As shown, the structure of the cover assembly is as follows Figures 10 to 13 As shown, the cover plate assembly includes a cover plate 1 that can be integrated with the explosion-proof valve and the pole 101 , and an insulating member 2 provided on the cover plate 1 .

[0043] In order to better understand the cover assembly of this embodiment, the structure of the power battery is briefly described here first. Figure 1 、 Figure 2 and Figure 9 As shown, generally speaking, a power battery includes a battery housing and an electrode group 3 located within the battery housing. The electrode group 3 includes a positive electrode sheet, a negative electrode sheet, and a separator sandwiched between the positive and negative electrode sheets. The battery housing generally includes a housing body, which has a receiving cavity with an open side. A cover assembly seals the open side to form a sealed receiving cavity. The aforementioned electrode group 3 is located within the receiving cavity.

[0044] In the present application, the cover plate 1 is long and narrow, and the explosion-proof valve is located in the middle of the cover plate 1, and poles 101 are provided on both sides of the explosion-proof valve; the insulating member 2 includes a main body portion 201 provided on one side of the cover plate 1 and arranged in the shape of the cover plate 1, a tightening portion 202 located at one end of the main body portion 201 in the longitudinal direction before bending, and a bending portion 203 connecting the main body portion 201 and the tightening portion 202.

[0045] The abutting portion 202 is bent relative to the main portion 201 via the bent portion 203. The bent abutting portion 202 abuts against the side of the main portion 201 facing away from the cover plate 1 and is snap-connected to the main portion 201. The abutting portion 202 is provided with vent holes 2027 corresponding to the explosion-proof valves, and cavities 2023 corresponding one-to-one to the poles 101. Each cavity 2023 is recessed toward the side away from the cover plate 1.

[0046] It should be noted that since welding slag is easily generated at the welding location of the pole 101 and the pole tab 301, the cover plate assembly described in the present application, by making the insulating part 2 include a main part 201 located on one side of the cover plate 1 and a tightening part 202 located at one end of the main part 201 in the longitudinal direction, and by the set tightening part 202 being pressed against the side of the main part 201 facing away from the cover plate 1, the pole tab 301 can be better fixed and can play a role in shaping the pole tab 301. The tightening part 202 set in this way can be blocked on the side of the corresponding pole tab 301 facing away from the cover plate 1, and applied to power batteries, it can better prevent the welding slag of the pole 101 and the pole tab 301 from puncturing the diaphragm.

[0047] The vent holes 2027 corresponding to the explosion-proof valve are provided to improve the reliability of the explosion-proof valve. The cavity 2023 is provided to provide sufficient space to cover the welding area between the pole 101 and the tab 301, further preventing puncture of the diaphragm, further reducing the risk of puncture of the diaphragm, and thus improving the safety and reliability of the power battery. The abutting portion 202 is connected to the main body 201 via the bent portion 203, allowing the abutting portion 202 to bend relative to the main body 201 via the bent portion 203, and easily ensuring the degree of fit between the abutting portion 202 and the main body 201.

[0048] The abutment portion 202 is connected to the main body 201 by snapping together. This is a quick connection method that, compared to traditional threaded connections and welding, does not require complex tools and operating procedures, and can be reused multiple times through reasonable design. With this snap connection method, once the abutment portion 202 and the main body 201 are aligned, assembly is completed with a simple push or press, greatly improving production efficiency.

[0049] When disassembling, repairing, or replacing the abutting portion 202, simply applying a certain amount of external force to release the snap-fit ​​connection allows for easy removal, making it quick and convenient. Because the snap-fit ​​operation is simple and easy to learn, requiring minimal operator skill, companies don't need to invest significant time and resources in professional employee training. This allows companies to more flexibly allocate production personnel and reduce labor costs. Furthermore, the rapid assembly and disassembly process shortens production cycles, improves equipment utilization, and further reduces production costs.

[0050] In the present application, the main body part 201, the bent part 203 and the pressing part 202 are integrally formed, which is convenient for processing. The one-piece insulating part 2 is also convenient to assemble and use during application, which can reduce the number of parts and facilitate management. At the same time, the insulating part 2 processed by the injection molding process, in addition to having good insulation and protection performance, is not easily punctured by the welding slag of the pole 101 and the pole ear 301, thereby effectively reducing the risk of the welding slag puncturing the diaphragm.

[0051] It should be noted that the pole 101 is insulated from the cover 1 by the main body 201. The specific structure of the pole 101 and the method of mounting the pole 101 on the cover 1 and the main body 201 refer to existing structures. The structure of the main body 201 can refer to the existing lower plastic structure, which is used to insulate the pole 101 from the cover 1. The connection method between the main body 201 and the cover 1 can also refer to the existing technology.

[0052] In a preferred embodiment, the pressing portion 202 is one that extends along the length direction of the main body portion 201, and the pressing portion 202 is snap-connected to the main body portion 201, and the pressing portion 202 is blocked on the side of the main body portion 201 facing away from the cover plate 1. The pressing portion 202 is provided with an air vent 2027 corresponding to the explosion-proof valve, and a cavity 2023 corresponding to the pole 101, and the cavity 2023 is recessed toward the side away from the main body portion 201.

[0053] The pressing part 202 is connected to the main part 201 through the bending part 203, so that the pressing part 202 can be bent relative to the main part 201 through the bending part 203, and the degree of fit between the pressing part 202 and the main part 201 can be easily ensured, and the pressing part 202 after being bent relative to the main part 201 is snap-connected to the main part 201.

[0054] like Figures 10 to 13 As shown, in an exemplary embodiment, the cavities 2023 on the pressing portion 202 correspond one-to-one with the tabs 301, and the edges of the cavities 2023 press the corresponding tabs 301 against one side of the main portion 201. For example, in this application, four cavities 2023 are provided on the pressing portion 202, with every two cavities 2023 corresponding one-to-one with one pole 101 on the cover plate 1, and each cavity 2023 is recessed toward the side away from the cover plate 1.

[0055] Specifically, in the assembled power battery, if Figure 1 As shown, the pole groups 3 are two arranged side by side, as shown in FIG. Figure 2 As shown, each group is provided with two pole tabs 301 , and the two pole tabs 301 in one pole group 3 are blocked and cannot be shown.

[0056] That is to say, each pole 101 is welded to two oppositely arranged pole tabs 301. Therefore, there are two cavities 2023 corresponding to each pole 101, and the two cavities 2023 respectively cover the positions of the two pole tabs 301. On the one hand, the corresponding pole tabs 301 are pressed by the edges of the cavities 2023, and on the other hand, sufficient accommodation space is provided for the welding slag of the corresponding pole tabs 301, which can reduce the risk of puncturing the diaphragm, thereby improving the safety and reliability of the power battery.

[0057] like Figure 8 As shown, the width W3 of each periphery of the opening of the cavity 2023 pressed on the tab 301 is between 0.5 mm and 12 mm, and can be 0.5 mm, 5 mm, 9 mm, 12 mm, etc., to ensure that the pressing portion 202 has sufficient contact area with the tab 301, ensuring the effect of fixing and shaping the tab 301.

[0058] Continue to refer to Figure 8 As shown, the total depth H of the cavity 2023 is between 1.5 mm and 8.5 mm, and can be 1.5 mm, 4 mm, 6 mm, 8.5 mm, etc. The total depth of the cavity 2023 is limited here so that the cavity 2023 can better accommodate the welding slag at the connection between the tab 301 and the pole 101, thereby effectively reducing the risk of the welding slag puncturing the diaphragm. At the same time, limiting the total depth of the cavity 2023 can ensure that the local area 2021 has sufficient buffer space. If the total depth of the cavity 2023 is too small, the diaphragm and the tab 301 may be torn or squeezed, causing damage. If the total depth of the cavity 2023 is too large, it will occupy more space, resulting in low space utilization of the pole group 3, which will lead to a decrease in the capacity of the power battery.

[0059] In a further preferred embodiment, still referring to Figure 8 As shown, the effective depth h of the cavity 2023 is between 0.3 mm and 8 mm, such as 0.3 mm, 4 mm, 6 mm, 8 mm, etc. It should be noted here that the effective depth of the cavity 2023 refers to the distance between the bottom wall between adjacent connecting ribs 2025 and the bottom wall of the cavity 2023.

[0060] In another exemplary embodiment not shown in the figures, two cavities 2023 are provided on the pressing portion 202 , the two cavities 2023 correspond one-to-one to the two poles 101 on the cover plate 1 , and each cavity 2023 is recessed toward the side away from the cover plate 1 .

[0061] In this embodiment, there are one or two electrode groups 3, and the two pole ears 301 on each electrode group 3 correspond one-to-one to the two pole posts 101 on the cover plate 1. The pole ears 301 are also pressed by the edge of the cavity 2023. On the other hand, sufficient accommodation space is provided for the welding slag of the corresponding pole ears 301, which is also to reduce the risk of puncturing the diaphragm, thereby improving the safety and reliability of the power battery.

[0062] In some examples, such as Figures 10 to 13 As shown, the explosion-proof valve not shown in the figure is preferably located in the middle of the length direction of the cover plate 1, and is installed at the first installation hole 2012 on the cover plate 1. The specific installation method can refer to the existing structure.

[0063] It should be noted that the ventilation holes 2027 provided at the portion of the abutting portion 202 corresponding to the explosion-proof valve are, in this embodiment, four oblong holes. This ensures the structural strength of the abutting portion 202 while providing good ventilation. It should be understood that the number of ventilation holes 2027 can also be other numbers, such as one, three, or five. The shape of the ventilation holes 2027 can also be other shapes, such as circular, square, or triangular.

[0064] In order to better understand the assembly process of the cover assembly of this embodiment, for example Figure 9 As shown in FIG, it is a schematic diagram of the structure before the pressing part 202 is bent, the pole ear 301 of the pole group 3 is welded to the pole 101, and the main part 201 is connected to the cover plate 1. Figure 2 As shown in FIG. 2 , it is a structural diagram of the pressing portion 202 being bent to one side of the main portion 201. Figure 1 1 is a schematic structural diagram of the tab 301 being bent and the abutting portion 202 blocking the side of the corresponding tab 301 facing away from the cover plate 1 .

[0065] like Figures 10 to 13 As shown, the abutting portions 202 are connected to the main portion 201 via the bent portions 203. In the width direction of the cover plate 1, the dimensions of the bent portions 203 are smaller than those of the abutting portions 202. Furthermore, each abutting portion 202 is connected to the main portion 201 via the bent portions 203, and the dimensions of the bent portions 203 in the width direction of the cover plate 1 are limited to be smaller than those of the abutting portions 202. This facilitates smooth bending of the abutting portions 202 relative to the main portion 201. Furthermore, the dimensions of the bent portions 203 in the width direction of the cover plate 1 can also save material usage to a certain extent, further contributing to cost savings.

[0066] In an exemplary embodiment, referring to Figures 10 to 13 As shown, the main body 201 is provided with a first mounting hole 2012 and a second mounting hole 2013. There is one first mounting hole 2012 located in the middle of the main body 201, and two second mounting holes 2013 are provided, one on either side of the first mounting hole 2012. The cover 1 is provided with through holes 2026 that communicate with the first mounting hole 2012 and the second mounting hole 2013, respectively. The first mounting hole 2012 is used to mount the explosion-proof valve, and each second mounting hole 2013 is used to mount the pole 101.

[0067] In some exemplary embodiments, Figure 15 As shown, the bent portion 203 is provided with a glue reducing groove 2031, combined with Figure 13As shown, the bent portion 203 extends along the width direction of the cover plate 1, and the adhesive reduction groove 2031 is provided on one side of the bent portion 203 and extends along the extension direction of the bent portion 203, which facilitates smooth bending of the bent portion. It should be understood that in addition to this, the adhesive reduction groove 2031 can be provided on both sides of the bent portion 203, or it is also possible to not provide the adhesive reduction groove 2031. Here, the adhesive reduction groove 2031 provided on the bent portion 203 is easy to process and facilitates smooth bending of the bent portion.

[0068] In some exemplary embodiments, Figure 16 As shown, the bending portion 203 is provided with an opening 2032. Here, the opening 2032 provided on the bending portion 203 is easy to process and is conducive to the smooth bending of the bending portion.

[0069] In some exemplary embodiments, a buckle 2011 is provided on the main body 201, and a snap hole 2024 is provided on the pressing part 202. The buckle 2011 can be snapped into the snap hole 2024 to connect the main body 201 and the pressing part 202.

[0070] The buckle 2011 is provided on the main body 201, and the engaging hole 2024 is provided on the abutting portion 202. When the buckle 2011 is engaged with the engaging hole 2024, the two form a tight fit. The reasonable design of the buckle 2011 and the engaging hole 2024 can provide sufficient friction and mechanical locking force, ensuring that the main body 201 and the abutting portion 202 will not easily separate under normal external forces.

[0071] For example, in this embodiment, the abutting portion 202 is provided with nine engaging holes 2024. The buckles 2011 provided on the main body 201 correspond one to one with the engaging holes 2024. When the abutting portion 202 is bent to one side of the main body 201, the corresponding buckles 2011 and engaging holes 2024 engage together. For ease of description, a group of buckles 2011 and engaging holes 2024 engaged together is referred to herein as a group of engaging structures.

[0072] There are nine groups of clip structures, with three groups forming a row. The three groups of clip structures in each row are arranged at intervals along the width direction of the cover plate 1. The spacing between adjacent clip structures is between 15 mm and 40 mm, such as 15 mm, 26 mm, 30 mm, 40 mm, etc. The number of clip structures in each row is ≥ 2 to ensure the strength and reliability of the buckle, thereby ensuring the strength and stability of the connection between the pressing part 202 and the main part 201 after bending.

[0073] Two rows of snap-fit ​​structures are positioned along the length of the cover plate 1 on either side of the two cavities 2023 corresponding to one of the poles 101. Another row of snap-fit ​​structures and the bent portion 203 are positioned along the length of the cover plate 1 on either side of the two cavities 2023 corresponding to the other pole 101. This arrangement allows the edge of each cavity 2023 to firmly press against the corresponding tab 301, improving the compression and shaping of the tab 301, facilitating the secure attachment of the abutting portion 202 to one side of the main body 201, and ensuring a tight fit between the abutting portion 202 and the main body 201 after attachment.

[0074] It should be understood that the number of the snap-fit ​​structures between each pressing part 202 and the main part 201 can be not only nine groups, but also other groups, such as one group, three groups, two groups, five groups, eight groups, ten groups, etc. When setting, the pressing part 202 should be able to fit tightly with the main part 201 after being snapped together.

[0075] Reference Figure 13 and Figure 14 As shown, in order to improve the snap-fit ​​effect, in some exemplary embodiments, the buckle 2011 includes a connecting portion connected to the main body 201, and a snap-fit ​​portion protruding outward from the connecting portion in a radial direction of the buckle 2011. The snap-fit ​​hole 2024 includes a first snap-fit ​​hole 20241 suitable for the connecting portion to be inserted into, and a second snap-fit ​​hole 20242 suitable for the snap-fit ​​portion to be inserted into, and the first snap-fit ​​hole 20241 and the second snap-fit ​​hole 20242 are in communication.

[0076] The snap 2011 includes a snapping portion and a connecting portion. Since the snapping portion protrudes radially toward the outside of the connecting portion of the snap 2011, and the snapping hole 2024 includes a first snapping hole 20241 suitable for the connecting portion to be embedded, and a second snapping hole 20242 suitable for the snapping portion to be embedded, the apertures of the first snapping hole 20241 and the second snapping hole 20242 are different, and the aperture of the first snapping hole 20241 is smaller than the aperture of the second snapping hole 20242. When the connecting portion is embedded in the first snapping hole 20241, the snapping portion is snapped in the second snapping hole 20242, so that the snap 2011 can be firmly fixed in the snapping hole 2024, which is beneficial to improving the reliability of the snap connection between the main body 201 and the pressing portion 202.

[0077] In some exemplary embodiments, the buckle 2011 includes a plurality of sub-buckles 20111 spaced apart along the centerline of the buckle 2011. Each sub-buckle 20111 comprises a sub-connecting block 20113 connected to the main body 201, and a sub-clamping block 20112 projecting radially outwardly of the sub-connecting block 20113. The sub-connecting blocks 20113 are collectively embedded in the first engaging hole 20241, and the sub-clamping blocks 20112 are collectively embedded in the second engaging hole 20242. In other words, the buckle 2011 is secured to the abutting portion 202 via the sub-clamping blocks 20112. The sub-connecting blocks 20113 collectively constitute the aforementioned connecting portion, and the sub-clamping blocks 20112 collectively constitute the aforementioned engaging portion.

[0078] The buckle 2011 includes multiple sub-buckles 20111, each sub-buckle 20111 includes a sub-buckle block 20112 and a sub-connecting block 20113, multiple sub-buckle blocks 20112 together constitute a clamping part, and multiple sub-connecting blocks 20113 together constitute a connecting part. When the buckle 2011 is clamped in the clamping hole 2024, multiple sub-buckle blocks 20112 are offset toward the center line of the buckle 2011 together, so that the clamping hole 2024 can be smoothly clamped into the clamping hole 2024, the clamping process is convenient, and after the clamping is completed, each sub-buckle block 20112 is reset under the action of its own sub-connecting block 20113, so that the buckle 2011 can be firmly clamped in the clamping hole 2024, and the reliability and stability of the clamping are high.

[0079] For example, in one embodiment, the cross-sections of the first engaging hole 20241 and the second engaging hole 20242 are both circular, and the cross-sections of the connecting portion and the engaging portion are also circular. In the above structure, the buckle 2011 includes a engaging portion and a connecting portion, and the engaging hole 2024 includes a first engaging hole 20241 and a second engaging hole 20242 of different apertures. The connecting portion is embedded in the first engaging hole 20241, and the engaging portion is locked in the second engaging hole 20242. This allows the buckle 2011 to be firmly fixed in the engaging hole 2024, thereby improving the reliability of the engaging connection between the main body 201 and the abutting portion 202.

[0080] It should be noted that when the buckle 2011 is engaged with the engaging hole 2024, the center line of the buckle 2011 and the axial center line of the engaging hole 2024 are collinear. Figure 14 As shown, there are four sub-buckles 20111 , and the cross section of the snap-fitting portion of each sub-buckle 20111 is sector-shaped with a central angle of 90°, and the cross section of the connecting portion of each sub-buckle 20111 is also sector-shaped with a central angle of 90°.

[0081] It is worth mentioning that, in order to facilitate the installation and removal of the buckle 2011 in the engaging hole 2024, in a preferred embodiment, the end of the engaging portion that is first inserted into the engaging hole 2024 is provided with a first guide portion, which is used to guide the buckle 2011 to be engaged in the engaging hole 2024. The other end of the engaging portion, opposite to the end provided with the first guide portion, is provided with a second guide portion, which is used to guide the buckle 2011 to be removed from the engaging hole 2024.

[0082] In a specific implementation, the first guide portion and the second guide portion can be chamfers provided on the clamping portion to facilitate smooth insertion and removal of the clamp 2011 in the clamping hole 2024. For example, in this embodiment, both ends of each sub-clamp 20111 are provided with chamfers to improve the insertion and removal efficiency of the clamp 2011 in the clamp 2011.

[0083] In another embodiment, the first guide portion and the second guide portion are both rounded, and the radius size of the first guide portion is between 0.15mm-0.5mm, such as 0.15mm, 0.2mm, 0.35mm, 0.5mm, etc., so that the buckle 2011 can be easily installed into the snap-on hole 2024 during assembly. The radius size of the second guide portion is between 0.15mm-0.3mm, such as 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc., so that the opening part is not damaged during the disassembly of the buckle 2011, and the buckle 2011 is convenient for reuse.

[0084] In some exemplary embodiments, four sub-clip buckles 20111 are spaced apart circumferentially around the engaging hole 2024. The limitation of four sub-clip buckles 20111 here facilitates processing and ensures the reliability and stability of the engaging of the buckle 2011 in the engaging hole 2024. The number of sub-clip buckles 20111 can of course be other numbers, such as one, two, or five.

[0085] In some exemplary embodiments, Figure 14 As shown, the spacing W between two adjacent sub-buckles 20111 is between 1.2 mm and 1.8 mm, and can be 1.2 mm, 1.4 mm, 1.5 mm, 1.8 mm, etc. Defining the spacing between two adjacent sub-buckles 20111 allows for ample room for deformation when the buckle 2011 is assembled in the engaging hole 2024, and can better ensure the reliability and stability of the engaging of the buckle 2011 in the engaging hole 2024.

[0086] In some exemplary embodiments, Figure 6As shown, the radial engagement length W1 of each sub-clamping block 20112 and the abutting portion 202 in the engaging hole 2024 is between 0.35 mm and 0.65 mm, and can be 0.35 mm, 0.4 mm, 0.5 mm, 0.65 mm, etc. This not only secures the engaging block within the engaging hole 2024 but also facilitates quick insertion and removal of the engaging block. Preferably, W ≥ 2 * W1, ensuring interference-free assembly and disassembly of the buckle 2011, and ensuring ease of assembly and disassembly.

[0087] In some exemplary embodiments, the engagement area between each sub-engaging block 20112 and the pressing portion 202 is 0.25 mm 2 -1.5 mm 2 between, such as 0.25mm 2 , 0.8mm 2 , 1mm 2 , 1.5mm 2 The total engagement area S between all the sub-clamping blocks 20112 and the pressing portion 202 is between 0.6 mm² and 6 mm², for example, 0.6 mm². 2 , 1.8mm 2 , 4mm 2 , 6mm 2 Etc., can ensure the buckle 2011's own strength and buckling strength.

[0088] The thickness P of each sub-clamping block 20112 in the axial direction of the clamping hole 2024 is between 0.6mm and 4.5mm. If it can be 0.6mm, 1.5mm, 3.2mm, 4.5mm, etc., it can help ensure that the clamping block maintains rigidity when bearing the pressure of the tab 301, while avoiding being too thick to be unfavorable for lightweight design.

[0089] In some exemplary embodiments, a boss 2028 is provided on the main body portion 201. When the main body portion 201 is connected to the tightening portion 202 by being clamped, the boss 2028 protrudes toward one side of the main body portion 201. The clamping hole 2024 is provided at the boss 2028 and passes through the tightening portion 202. After being clamped, the tightening portion 202 is tightened to the main body portion 201 through the boss 2028.

[0090] By setting a boss 2028 on the tightening part 202 and setting a snap-in hole 2024 on the boss 2028 and passing through the tightening part 202, the thickness of the snap-in hole 2024 can be increased. When the main part 201 and the tightening part 202 are snap-connected, such a structure can improve the stability and reliability of the connection between the two.

[0091] In some exemplary embodiments, the abutting portion 202 includes a local region 2021 corresponding to each tab 301, and an edge region 2022 surrounding the local region 2021, with the edge region 2022 extending outward from the local region 2021. Each cavity 2023 is formed by a depression of the corresponding local region 2021 toward a side away from the main portion 201.

[0092] For ease of understanding, refer to Figures 10 to 13 As shown, in an example, there are multiple local regions 2021 , for example, four, and the local regions 2021 correspond to the tabs 301 one by one. The multiple local regions 2021 are arranged corresponding to each tab 301 .

[0093] The local area 2021 is recessed toward the side away from the cover plate 1 to form a cavity 2023. This has a simple structure, is easy to process, and uses relatively little material. When this electrode assembly 3 is used in a power battery, the local area 2021 easily abuts against the electrode assembly 3 within the power battery, limiting its position and thus helping to attenuate vibrations of the electrode assembly 3. The local area 2021 and the edge area 2022 are connected by connecting ribs 2025, while the other parts are disconnected. This ensures sufficient elasticity and strength in the local area 2021, maximally buffering the vertical movement of the electrode assembly 3 and effectively preventing risks such as internal battery short circuits caused by compression and damage to the tabs 301 or diaphragms.

[0094] In addition, the local area 2021 is limited and connected to the edge through the connecting ribs 2025, and gaps are formed between adjacent connecting ribs 2025, so that the electrolyte can flow through the gaps. Moreover, such a connection method is also conducive to the vibration of the local area 2021, and the material consumption is also less, which is conducive to cost saving.

[0095] It should be understood that when actually forming the cavity 2023, the cavity 2023 can be formed by removing material from the local area 2021. In this way, when the depth of the cavity 2023 is large, the thickness of the pressing part 202 is large, and more material is used during production.

[0096] As a preferred embodiment, refer to Figure 11 and Figure 13 As shown, each local region 2021 is recessed toward the side away from the cover plate 1 to form a cavity 2023. During processing, the local regions 2021 and the edge regions 2022 can have the same thickness, allowing the cavity 2023 to be formed even with materials of smaller thickness. This structure is simple, easy to process, and uses less material. When this cover plate assembly is used in a power battery, the local regions 2021 can be tightly abutted against the electrode group 3 within the power battery, effectively dampening any vertical movement of the electrode group 3.

[0097] In some exemplary embodiments, the local area 2021 and the edge area 2022 are connected by connecting ribs 2025, and each local area 2021 is provided with connecting ribs 2025 in the circumference. The connecting ribs 2025 in the circumference of each local area 2021 are multiple and arranged at intervals around the local area 2021.

[0098] Reference Figures 12 to 13 As shown, as a preferred embodiment, the local area 2021 is connected to the edge area 2022 by connecting ribs 2025, and connecting ribs 2025 are provided on both sides of the local area 2021. There are multiple connecting ribs 2025 on each side that are arranged in sequence at intervals.

[0099] For example Figure 13 In the example shown, connecting ribs 2025 are provided on both sides of the local area 2021 along the length direction of the cover plate 1. There are four connecting ribs 2025 on each side, and the four connecting ribs 2025 on each side are arranged in sequence along the width direction of the cover plate 1.

[0100] The spaces between any adjacent connecting ribs 2025 on each side allow for the passage of electrolyte. Along the width of the cover plate 1, strip holes are provided on both sides of the localized area 2021. Each strip hole extends along the length of the cover plate 1, and the length of each strip hole is greater than the length of the cavity 2023 along the length of the cover plate 1. This allows the localized area 2021 to be connected only by the connecting ribs 2025 on both sides along the length.

[0101] For example Figure 7 As shown in , after the cover assembly is assembled on the battery housing, the local region 2021 and the electrode group 3 are tightly abutted against each other. Thus, when the electrode group 3 shakes, the local region 2021 can limit the position of the electrode group 3, effectively attenuating the vertical movement of the electrode group 3. In actual layout, a certain gap between the local region 2021 and the electrode group 3 is also acceptable.

[0102] Still refer to Figure 10 and Figure 11 As shown, in another example, multiple connecting ribs 2025 are provided around each local area 2021, and the multiple connecting ribs 2025 are spaced apart around the local area 2021. Specifically, along the length direction of the cover plate 1, the connecting ribs 2025 on both sides of the local area 2021 are consistent with those described above. In addition, along the width direction of the cover plate 1, connecting ribs 2025 are also provided on both sides of the local area 2021, and the connecting ribs 2025 on both sides are spaced apart along the length direction of the cover plate 1.

[0103] It should be noted that the number of connecting ribs 2025 on each side can be arranged according to actual needs and is not limited to the four shown in the figure. For example, it can be one, three, or six. In the above structure, the local area 2021 and the edge area 2022 are connected by connecting ribs 2025. Spaces are provided between adjacent connecting ribs 2025 to allow electrolyte to flow through the spaces. This connection method also facilitates vibration of the local area 2021 and reduces material consumption, thereby saving costs.

[0104] In some exemplary embodiments, the length L of the connecting ribs 2025 is between 0.8 mm and 10 mm, the width W of the connecting ribs 2025 is between 0.5 mm and 5 mm, and the width G of the gaps between adjacent connecting ribs 2025 is between 0.8 mm and 3.0 mm. The length and width of the connecting ribs 2025, as well as the width of the gaps between adjacent connecting ribs 2025, are defined so that the local area 2021 can provide the maximum buffering effect on the electrode group 3, thereby improving the overall safety of the power battery.

[0105] In some exemplary embodiments, the bottom wall area S of the cavity 2023 is 6 mm 2 -300mm 2 The area between the local area 2021 and the electrode group 3 can be 6mm², 70mm², 150mm², 200mm², 250mm², 300mm², etc., to ensure that the local area 2021 has sufficient contact area with the electrode group 3, and prevent the electrode group 3 from being damaged due to excessive local pressure caused by a small area.

[0106] Here, the characteristics and related parameters of the cavity 2023 are limited to ensure the maximum buffering effect of the electrode group 3 and improve the overall safety of the battery.

[0107] Finally, it should be noted that the material of the insulating member 2 can refer to existing lower plastic materials, for example, polypropylene (PP). Because polypropylene has excellent electrical insulation and impact resistance, it not only effectively insulates the cover plate 1 from the pole 101, but also utilizes its excellent elastic properties to enhance the vibration attenuation effect of the localized area 2021 on the pole group 3.

[0108] At the same time, the present application also relates to a power battery, which is provided with the cover plate assembly as described above.

[0109] Meanwhile, this embodiment also relates to an electric device, wherein a power battery of the electric device is provided with the above cover assembly. The electric device may be, for example, an existing vehicle.

[0110] In this embodiment, by applying the aforementioned cover plate assembly to the power battery, the safety and reliability of the power battery can be improved, thereby improving the safety and reliability of electrical equipment.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cover plate assembly, characterized in that: It includes a cover plate capable of being integrated with the explosion-proof valve and the pole, and an insulating member provided on the cover plate; The cover plate is in an elongated strip shape, and the explosion-proof valve is located in the middle of the cover plate, and the poles are provided on both sides of the explosion-proof valve; The insulating member includes a main body portion provided on one side of the cover plate and arranged in accordance with the shape of the cover plate, a pressing portion located at one end of the main body portion in the length direction before being bent, and a bending portion connecting the main body portion and the pressing portion; The main body, the bent portion, and the abutting portion are integrally formed, the abutting portion is bent relative to the main body by the bent portion, and the bent abutting portion abuts against a side of the main body facing away from the cover plate and is snap-connected to the main body; The pressing portion is provided with air holes corresponding to the explosion-proof valves, and cavities corresponding to the poles one by one, and each of the cavities is recessed toward a side away from the cover plate.

2. The cover plate assembly according to claim 1, wherein: The main body is provided with a buckle, and the pressing part is provided with a snap-fitting hole. The buckle can be snapped into the snap-fitting hole to connect the main body and the pressing part.

3. The cover plate assembly according to claim 2, wherein: The buckle comprises a connecting portion connected to the main body, and a clamping portion protruding radially outward of the connecting portion. The clamping hole comprises a first clamping hole suitable for the connecting portion to be embedded, and a second clamping hole suitable for the clamping portion to be embedded.

4. The cover plate assembly according to claim 3, wherein: The buckle comprises a plurality of sub-buckles spaced apart along a center line of the buckle, each of the sub-buckles comprising a sub-connecting block connected to the main body, and a sub-clamping block protruding outwardly of the sub-connecting block along a radial direction of the buckle; A plurality of the sub-connecting blocks are embedded in the first clamping hole together, and a plurality of the sub-clamping blocks are embedded in the second clamping hole together.

5. The cover plate assembly according to claim 4, wherein: There are four sub-buckles arranged at intervals along the circumference of the clamping hole; and / or, The distance W between two adjacent sub-buckles is between 1.2 mm and 1.8 mm.

6. The cover plate assembly according to claim 4, wherein: The clamping length W1 of each of the sub-clamping blocks and the abutting portion in the radial direction of the clamping hole is between 0.35mm and 0.65mm, and the buckling area between each of the sub-clamping blocks and the abutting portion is between 0.25mm and 0.65mm. 2 -1.5 mm 2 between; and / or, The thickness P of each of the sub-clamping blocks in the axial direction of the clamping hole is between 0.6 mm and 4.5 mm.

7. The cover plate assembly according to claim 3, wherein: The main body is provided with a boss, the engaging hole is provided at the boss and passes through the abutting portion; After being clamped, the pressing portion is pressed against the main body portion via the boss.

8. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The abutting portion comprises a local area respectively provided corresponding to each of the poles, and an edge area extending outward from the local area; Each of the cavities is formed by the corresponding local area being recessed toward a side away from the main body portion. The local area and the edge area are connected by connecting ribs, and the connecting ribs are multiple and spaced apart along the circumference of the local area.

9. The cover plate assembly according to claim 8, wherein: The length L of the connecting rib is between 0.8 mm and 10 mm, the width W of the connecting rib is between 0.5 mm and 5 mm, and the width G of the gap between adjacent connecting ribs is between 0.8 mm and 3.0 mm; and / or, The bottom wall area S of the cavity is 6mm 2 -300mm 2 between.

10. An electrical device, characterized in that: The power battery in the electrical equipment is provided with a cover plate assembly according to any one of claims 1 to 9.

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