light cover plate

Abstract

This application proposes a cover plate, including a cover plate body having a first surface and a second surface. The cover plate body has two first through holes to accommodate an electrode post and expose one end face of the electrode post. The second surface is fixed to a closed-loop fixing ring to limit the installation of the electrode post and exposes the other end face of the electrode post through the second through hole. The cover plate body has an explosion-proof area, including a first explosion-proof part and a second explosion-proof part. When the pressure of the power supply equipment exceeds the standard, the first explosion-proof part breaks to release pressure. In case of failure, the second explosion-proof part serves as a backup pressure release path. This solves the problems of the electrode post being susceptible to environmental corrosion leading to shortened lifespan and safety hazards, the explosion-proof valve welding process damaging the cover plate's sealing performance, and the high risk of failure of a single explosion-proof path. By using the fixing ring to invert the electrode post, its exposed area is reduced, blocking moisture and corrosive media. The explosion-proof area formed on the cover plate body is protected from welding heat damage, ensuring sealing integrity and explosion-proof response. The dual explosion-proof design also reduces the safety risks caused by single-point failure.

Description

Technical Field

[0001] This application relates to the technical field of electrode post packaging components, and more particularly to a light cover plate. Background Technology

[0002] In the packaging structure of batteries or power modules, the cover plate and electrode terminals are key components for achieving external circuit connection and internal sealing protection. The cover plate, typically serving as the sealing structure at the top of the battery, possesses not only good mechanical strength but also excellent insulation and sealing performance. The positive and negative terminals, acting as the positive and negative interfaces for current output, are positioned on the cover plate to facilitate the installation of the entire power supply mechanism into external devices and achieve electrical connection. Through reasonable structural design, the connection between the cover plate and the terminals must not only ensure the stability of electrical conduction but also possess sufficient mechanical strength and environmental adaptability to ensure the safe and reliable operation of the power supply device.

[0003] In existing technologies, to achieve stable installation of the terminals on the cover plate, a stamping and stretching process is typically used to form a fixing ring structure with a certain height and strength on the surface of the cover plate. This fixing ring surrounds the terminal and cooperates with it for positioning, thereby firmly fixing the positive and negative terminals to the cover plate. This structure simplifies the assembly process, improves production efficiency, and enhances the connection stability between the terminal and the cover plate to a certain extent, and is widely used in the manufacturing process of various battery modules. Furthermore, an explosion-proof valve is also provided on the cover plate to automatically release pressure when the internal pressure of the power supply equipment exceeds a safety threshold, preventing explosions or damage caused by excessive internal pressure, further improving the safety of the battery system.

[0004] However, existing technologies have significant drawbacks. First, because the fixing ring is formed on the upper surface (i.e., the outer surface) of the cover plate, and the electrode post is directly mounted on this surface, the electrode post is constantly exposed to the external environment, making it susceptible to adverse factors such as humidity, dust, and corrosive gases. Especially in high-humidity or highly corrosive environments, the electrode post is prone to oxidation, corrosion, and even short circuits, affecting its conductivity and lifespan, and in severe cases, potentially leading to safety accidents. Second, the explosion-proof valve is usually fixed to the cover plate by welding. The high temperatures during welding can damage the local encapsulation material of the cover plate, reducing its sealing performance and structural integrity. Furthermore, if the explosion-proof valve malfunctions in its burst zone, the internal pressure of the power supply equipment cannot be released in time, increasing the risk of the battery system malfunctioning due to excessive pressure. Therefore, improving the installation structure of the cover plate and explosion-proof valve to meet assembly requirements, effectively isolate the electrode post from the adverse effects of the external environment, and improve the reliability of explosion-proof operation has become a crucial technical challenge that needs to be addressed to enhance the overall safety and stability of the power supply device. Utility Model Content

[0005] This application provides a light cover plate to solve two technical problems existing in existing light cover plates: on the one hand, the pole is easily affected by humidity and corrosive gases when exposed to the external environment for a long time, resulting in a shortened service life and reduced safety; on the other hand, the sealing performance and structural integrity of the encapsulation material are easily damaged during the welding of explosion-proof valves in existing light cover plates, and if the explosion-proof valve fails, there is a risk that it cannot release pressure in time, thereby endangering the safe operation of the power supply equipment. The technical solution is as follows:

[0006] This application provides a light cover plate, including: a cover plate body having a first surface and a second surface arranged opposite to each other; the cover plate body has two first through holes, each first through hole being used to accommodate one end of an electrode post, so that the end face of the corresponding electrode post can be exposed on the first surface through the first through holes; the cover plate body has a fixing ring corresponding to each of the two first through holes, the fixing ring being connected to the second surface for limiting the installation of the electrode post, the fixing ring having a second through hole at the end opposite to the second surface, so that the end face of the corresponding electrode post opposite to the first through hole can be exposed on the second surface through the second through hole; the cover plate body also has an explosion-proof area located between the two first through holes, the explosion-proof area having two explosion-proof structures, the structural strength of the explosion-proof structures being weaker than the structural strength of the rest of the cover plate body, and both explosion-proof structures being annular, so as to respectively form a first explosion-proof part and a second explosion-proof part on the explosion-proof area.

[0007] When the explosion-proof structure is in a fractured state, at least one of the first explosion-proof part and the second explosion-proof part separates from the cover plate body.

[0008] In one embodiment, the fixed ring body is bent to form a first limiting wall and a second limiting wall; the first limiting wall is perpendicular to the second surface; the second limiting wall extends toward the center of the first limiting wall and is parallel to the second surface to form a limiting groove in the fixed ring body, and the pole piece is embedded in the limiting groove.

[0009] In one embodiment, a relief groove is provided on the cover plate body on the first surface, a first through hole is provided at the center of the relief groove and the first through hole communicates with the relief groove; a groove-shaped limiting structure is arranged on the inner wall of the first through hole along its circumference, the limiting structure is used to engage with the radial side of the pole piece.

[0010] In one embodiment, the area of ​​the second explosion-proof part is smaller than the area of ​​the first explosion-proof part, and the second explosion-proof part is disposed in the first explosion-proof part.

[0011] In one embodiment, at least two annular grooves are formed on the first surface in the explosion-proof area, so as to form two explosion-proof structures between the bottom of the two annular grooves and the second surface, respectively.

[0012] In one embodiment, the annular groove is a straight groove, and the groove body of the annular groove is configured as a wedge shape that gradually expands in size from the bottom to the opening.

[0013] In one embodiment, the explosion-proof area includes: a first part, wherein a first explosion-proof part and a second explosion-proof part are located on the first part; a second part, connected to the first part, and the second part is an annular ring surrounding the outer periphery of the first part; and a ribbed structure is provided between the first part and the second part, the ribbed structure being used to weaken the thermal conductivity of the cover plate body.

[0014] In one embodiment, the thickness of the first part is less than the thickness of the second part, so that the height difference between the second part and the first part forms a ribbed structure; or, the thickness of the first part is greater than the thickness of the second part, so that the height difference between the first part and the second part forms a ribbed structure.

[0015] In one embodiment, a buffer groove is provided on the second part. The buffer groove is annular and is used to reduce the thermal conductivity of the cover plate body.

[0016] In one embodiment, the number of buffer grooves is at least two, and the two buffer grooves are arranged opposite to each other on the first surface and the second surface.

[0017] Compared with existing technologies, the optical cover plate proposed in the above technical solution, by setting a fixed ring with a closed-loop structure on the second surface of the cover plate body, which is the inner surface of the cover plate body relative to the power supply equipment, allows the electrode to be installed in an inverted manner. One end of the electrode is exposed through a first through hole on the first surface for connection with external circuitry, and the other end is exposed through a second through hole on the second surface for electrical connection with the internal wiring of the power supply equipment. This structural design ensures that the main part of the electrode is enclosed inside the cover plate body or within its protected area, significantly reducing the area of ​​the electrode directly exposed to the external environment, effectively isolating it from the influence of adverse factors such as humidity, dust, and corrosive gases, improving the durability of the electrode and the reliability of the electrical connection, and extending the service life of the power supply device. Furthermore, an explosion-proof area is integrated into the cover plate body, and within this area, two annular explosion-proof structures with structural strength lower than the surrounding materials are set, forming the first and second explosion-proof parts respectively, creating a dual protection mechanism of a commonly used explosion-proof area and a backup explosion-proof area. When the internal pressure of the power supply equipment reaches a set threshold, pressure can be released preferentially through the first explosion-proof section. If the first explosion-proof section fails due to manufacturing defects or environmental factors, the second explosion-proof section can serve as a backup blast path, ensuring that the internal pressure of the power supply equipment can be released in a timely manner and avoiding safety accidents caused by excessive pressure. Compared with the explosion-proof valve structure in the prior art that relies on welding for fixation, the explosion-proof area in this application is integrally formed with the cover plate body, eliminating the need for additional welding processes. This avoids thermal damage to the cover plate packaging material caused by high temperatures, maintains the structural integrity and sealing performance of the cover plate body, and further improves the stability and safety of the overall packaging system.

[0018] In summary, this application provides a light cover structure with excellent protective performance and reliable explosion-proof response, which successfully overcomes the defects of the prior art, such as the susceptibility of the electrode post to environmental corrosion, the impact of explosion-proof valve welding on sealing performance, and the single explosion-proof function, and provides a brand-new solution for the safe packaging of battery modules.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0021] Figure 1 This is a schematic diagram of the structure of the cover plate in the embodiment of this application;

[0022] Figure 2 for Figure 1 AA section view;

[0023] Figure 3 This is an installation diagram of the fixed ring housing the pole piece in an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of the fixed ring bending limiting pole piece in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of the explosion-proof area in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram of the serrated structure on the pole piece in the embodiments of this application.

[0027] Figure label:

[0028] 1. Cover plate body;

[0029] 11. Fixed ring; 12. Explosion-proof area; 13. Relief groove; 14. Limiting structure;

[0030] 101. First surface; 102. Second surface; 103. First through hole; 110. Second through hole; 111. First limiting wall; 112. Second limiting wall; 113. Limiting groove;

[0031] 12a. First part; 12b. Second part; 12c. Protruding rib structure; 12d. Buffer groove;

[0032] 121. First explosion-proof section; 122. Second explosion-proof section; 123. Annular groove;

[0033] 2. Pole post;

[0034] 20. Serrated structure. Detailed Implementation

[0035] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0036] Reference Figures 1 to 5As shown, an embodiment of this application proposes a light cover plate, which may include: a cover plate body 1 having a first surface 101 and a second surface 102 arranged opposite to each other; the cover plate body 1 is provided with two first through holes 103, the two first through holes 103 being respectively used to accommodate one end of the electrode post 2, so that the end face of the corresponding electrode post 2 can be exposed on the first surface 101 through the first through holes 103; the cover plate body 1 is provided with a fixing ring 11 corresponding to the two first through holes 103, the fixing ring 11 being connected to the second surface 102 for limiting the installation of the electrode post 2. The post 2 and the fixing ring 11 have a second through hole 110 at one end facing away from the second surface 102, so that the end face of the corresponding pole post 2 facing away from the first through hole 103 can be exposed on the second surface 102 through the second through hole 110; the cover plate body 1 also has an explosion-proof area 12 located between the two first through holes 103, and the explosion-proof area 12 has two explosion-proof structures. The structural strength of the explosion-proof structure is weaker than the structural strength of the rest of the cover plate body 1, and both explosion-proof structures are annular, so as to form a first explosion-proof part 121 and a second explosion-proof part 122 on the explosion-proof area 12 respectively;

[0037] When the explosion-proof structure is in a broken state, at least one of the first explosion-proof part 121 and the second explosion-proof part 122 separates from the cover plate body 1.

[0038] Specifically, in the technical solution adopted in this application, the cover plate body 1 has a plate-like structure with an upper surface and a lower surface. In this application, the upper surface can be defined as the first surface, and the lower surface can be defined as the second surface 102. Two pole pieces 2 are arranged on the cover plate body 1. The two pole pieces 2 can be positive pole pieces and negative pole pieces. Two first through holes 103 are opened on the cover plate body 1 so that one end face of the two pole pieces 2 is exposed on the first surface 101 through the corresponding first through holes 103, thereby facilitating the electrical connection of the two pole pieces 2 with the electrical equipment. To fix the electrode post 2 to the cover plate body 1, a fixed ring 11 with a closed-loop structure is formed on the second surface 102 for embedding the electrode post 2. The fixed ring 11 has a second through hole 110 on the side opposite to the second surface 102, which corresponds to the first through hole 103, so that the second through hole 110 can be connected to the first through hole 103. When the electrode post 2 is installed upside down in the fixed ring 11, the other end face of the electrode post 2 is exposed on the second surface 102 through the second through hole 110, so as to facilitate the electrical connection between the electrode post 2 and the power supply equipment. Since the fixed ring 11 is located inside the cover plate body 1 when the cover plate body 1 is installed on the power supply equipment, and only one end face of the electrode post 2 is exposed on the first surface 101 of the cover plate body 1, the sealing structure can be prevented from being directly corroded by the external environment, such as humidity and corrosive gases. An explosion-proof area 12 is also formed on the cover plate body 1. The explosion-proof area 12 can automatically detach and release pressure when the internal pressure of the power supply equipment is too high. To achieve this function, two explosion-proof structures are provided on the explosion-proof area 12, and both explosion-proof structures are annular. Thus, the two explosion-proof structures enclose the explosion-proof area 12 to form a first explosion-proof part 121 and a second explosion-proof part 122. In this embodiment, the two explosion-proof structures can change the structural strength of a part of the structure on the explosion-proof area 12. Therefore, the first explosion-proof part 121 and the second explosion-proof part 122 can serve as the commonly used blasting area and the backup blasting area on the explosion-proof area 12. For example, the first explosion-proof part 121 is the commonly used blasting area of ​​the explosion-proof area 12, and the second explosion-proof part 122 is the backup blasting area of ​​the explosion-proof area 12. When the internal pressure of the power supply equipment reaches or exceeds a set threshold, the explosion-proof area 12 is compressed and bursts through the first explosion-proof part 121 by the internal pressure of the power supply equipment to form a pressure relief port. If the first explosion-proof part 121 malfunctions and cannot burst normally by compression, the internal pressure of the power battery can be released by bursting through the second explosion-proof part 122. This effectively reduces the probability that the explosion-proof area 12 cannot release pressure normally due to a malfunction, making the power battery safer and more reliable during use, and providing users with a more secure user experience.

[0039] In some embodiments, the explosion-proof structure may be made of a material with a structural strength weaker than that of the explosion-proof area 12. For example, the explosion-proof area 12 may be made of MFX2-0 material with a thickness adjusted to 0.5 mm. It should be noted that MFX2 is currently a high-performance, highly formable aluminum material. MFX2 has an elongation of up to 40% and good machinability.

[0040] For explosion-proof structures, other relatively soft metals can be used, such as: tin, which has a low melting point of approximately 231.9 degrees Celsius. Tin and the MFX2-0 state material can be heated simultaneously to above tin's melting point. In the liquid state, through stirring or a special mold design, the tin can evenly coat or penetrate the MFX2-0 state material, and after cooling, the two can fuse well together. Lead, with its softness and relatively low melting point (approximately 327.5 degrees Celsius), can be fused with the MFX2-0 state material through metallurgical processes such as die casting and melting at suitable processing temperatures. Indium, a soft metal with good ductility, melts at relatively low temperatures, with a melting point of approximately 156.61 degrees Celsius, making its fusion process relatively less temperature-sensitive. Cadmium, with a melting point of approximately 320.9 degrees Celsius, can be fused with the MFX2-0 state material through methods similar to casting or powder metallurgy.

[0041] In some embodiments, a groove can be opened at the target position of the explosion-proof area 12, or a cavity formed inside the layer structure of the explosion-proof area 12 can be provided at the target position of the explosion-proof area 12, so that the structural strength of the explosion-proof area 12 at the target position is weaker than the structural strength of the other positions of the explosion-proof area 12, thereby forming an explosion-proof structure that is easy to be blasted on the surface of the explosion-proof area 12 or in the internal structure of the explosion-proof area 12.

[0042] Furthermore, refer to Figures 2 to 4 As shown, in some embodiments, the fixed ring 11 is bent to form a first limiting wall 111 and a second limiting wall 112; the first limiting wall 111 is perpendicular to the second surface 102; the second limiting wall 112 extends toward the center of the first limiting wall 111 and is parallel to the second surface 102 to form a limiting groove 113 in the fixed ring 11, and the pole piece 2 is embedded in the limiting groove 113.

[0043] Specifically, in the technical solution adopted in this application, in order to enable the pole piece 2 to be installed in the fixing ring 11, the fixing ring 11 is bent to form a first limiting wall 111 and a second limiting wall 112. The first limiting wall 111 is perpendicular to the second surface 102 and is used to wrap around the radial side of the pole piece 2. The second limiting wall 112 is bent toward the circular direction of the first limiting wall 111, that is, the second limiting wall 112 is bent toward the inner side of the first limiting wall 111 and is parallel to the second surface 102. The second limiting wall 112 is used to abut against the second end face of the pole piece 2 and exposes part of the second end face through the second through hole 110, that is, the aforementioned second through hole 110, thereby forming a limiting groove 113 in the fixing ring 11 so that the pole piece 2 can be embedded in the limiting groove 113.

[0044] Furthermore, refer to Figures 1 to 4 ,as well as Figure 6 As shown, in some embodiments, a relief groove 13 is provided on the cover plate body 1 on the first surface 101, and a first through hole 103 is provided at the center of the relief groove 13 and communicates with the relief groove 13; a groove-shaped limiting structure 14 is arranged on the inner wall of the first through hole 103 along its circumference, and the limiting structure 14 is used to engage with the radial side of the pole piece 2.

[0045] Specifically, in the technical solution adopted in this application, in order to ensure that the first surface 101 has a certain degree of flatness after injection molding of polyphenylene sulfide (PPS), a relief groove 13 for accommodating PPS is provided on the cover plate body 1. The relief groove 13 is located on the first surface 101 surrounding the first through hole 103. During injection molding, PPS with a certain degree of fluidity can be injected into the relief groove 13, and part of the PPS flows into the first through hole 103 through the relief groove 13. When the relief groove 13 is filled, the first surface 101 has a certain degree of flatness, which facilitates the adhesion of the insulating film on the first surface 101. To prevent the pole piece 2 from rotating freely in the fixing ring 11 and the first through hole 103, a limiting structure 14 is provided on the inner side of the first through hole 103. The limiting structure 14 is a groove arranged along the axial direction of the first through hole 103. A serrated structure 20 adapted to the limiting structure 14 can be provided on the radial side of the pole piece 2 so that the radial side of the pole piece 2 can engage with the limiting structure 14, thereby increasing the torque of the pole piece 2 in the first through hole 103 and making the pole piece 2 installed in the cover plate body 1 more stable.

[0046] Furthermore, refer to Figure 1 and Figure 5 As shown, in some embodiments, the area of ​​the second explosion-proof part 122 is smaller than the area of ​​the first explosion-proof part 121, and the second explosion-proof part 122 is disposed in the first explosion-proof part 121.

[0047] Specifically, in the technical solution adopted in this application, the area of ​​the second explosion-proof part 122 can be set to be smaller than the area of ​​the first explosion-proof part 121. This can be explained as follows: the first explosion-proof part 121 occupies a larger area of ​​the explosion-proof region 12 surface compared to the second explosion-proof part 122, and the second explosion-proof part 122 is located within the first explosion-proof part 121. Therefore, when the first explosion-proof part 121, which is used for blasting, is not faulty, a larger pressure relief port can be formed by peeling off a portion of the explosion-proof region 12 structure on the first explosion-proof part 121, allowing the internal pressure of the power supply equipment to be released more quickly. However, when the first explosion-proof part 121 malfunctions and cannot properly detach from the explosion-proof region 12, the internal pressure of the power battery can be released by peeling off a portion of the explosion-proof region 12 structure on the second explosion-proof part 122 to form a pressure relief port.

[0048] Furthermore, refer to Figure 5 As shown, in some embodiments, at least two annular grooves 123 located on the first surface 101 are formed on the explosion-proof area 12, so as to form two explosion-proof structures between the bottom of the two annular grooves 123 and the second surface 102 respectively.

[0049] Specifically, in the technical solution adopted in this application, the preferred technical point for reducing the structural strength of the explosion-proof structure is to open an annular groove 123 on the structure of the explosion-proof area 12, so that the thickness of the explosion-proof structure is thinner than the thickness of the rest of the structure.

[0050] Furthermore, refer to Figure 5 As shown, in some embodiments, the annular groove 123 is a straight groove, and the groove body of the annular groove 123 is configured as a wedge shape that gradually expands in size from the bottom of the groove to the opening.

[0051] Specifically, in the technical solution adopted in this application, the groove of the annular groove 123 can be set as a wedge shape. The wedge-shaped groove is formed by gradually expanding the size from the bottom of the annular groove 123 to the opening. When extrusion pressure is formed on the explosion-proof area 12, the breakthrough point can be better concentrated at the position of the annular groove 123. However, it has been found in the production process that if the expansion angle of the annular groove 123 is too large, it will cause the first explosion-proof part 121 and / or the second explosion-proof part 122 to bulge and deform. At the same time, if the thickness reserved at the explosion-proof area 12 where the annular groove 123 is opened is too thin, it may cause the bottom of the annular groove 123 to be damaged before the internal pressure of the power supply equipment reaches the threshold. Therefore, according to measurements in this embodiment, the included angle between the two opposite groove walls and the bottom of the groove in the annular groove 123 can be set to an obtuse angle of 120±2 degrees; and the reserved thickness of the explosion-proof area 12 where the annular groove 123 is opened is set to 0.05±0.01mm. Thus, when the internal pressure of the power supply equipment reaches the set threshold, the first explosion-proof part 121 or the second explosion-proof part 122 will automatically explode, effectively relieving the pressure of the power supply equipment.

[0052] Furthermore, refer to Figure 5 As shown, in some embodiments, the explosion-proof area 12 includes: a first portion 12a, with a first explosion-proof part 121 and a second explosion-proof part 122 located on the first portion 12a; a second portion 12b connected to the first portion 12a, and the second portion 12b being annular surrounding the outer periphery of the first portion 12a; and a ribbed structure 12c between the first portion 12a and the second portion 12b, the ribbed structure 12c being used to weaken the thermal conductivity of the cover plate body 1.

[0053] Furthermore, refer to Figure 5 As shown, in some embodiments, the thickness of the first portion 12a is less than the thickness of the second portion 12b, so that the height difference between the second portion 12b and the first portion 12a forms the ribbed structure 12c; or, the thickness of the first portion 12a is greater than the thickness of the second portion 12b, so that the height difference between the first portion 12a and the second portion 12b forms the ribbed structure 12c.

[0054] Specifically, in the technical solution adopted in this application, the explosion-proof area 12 can be divided into a part for connecting with the surrounding cover plate body 1 and a part for supporting the annular groove 123. For ease of reference later, the part for supporting the annular groove 123 can be defined as the first part 12a, and the part for connecting with the cover plate body 1 can be defined as the second part 12b. Both annular grooves 123 are formed on the surface of the first part 12a to form the first explosion-proof part 121 and the second explosion-proof part 122; while the second part 12b is connected to the first part 12a, specifically connected to the outer peripheral edge of the first part 12a. The second part 12b is designed to be annular enough to enclose the outer periphery of the first part 12a. The convex structure 12c is formed by the thickness difference between the first part 12a and the second part 12b. For example, the thickness of the first part 12a is less than the thickness of the second part 12b, or the thickness of the first part 12a is greater than the thickness of the second part 12b. In a further embodiment, a groove can be formed on the surface of the explosion-proof area 12 to form the convex structure 12c, which is the groove wall. The groove projection can be adapted to the first part 12a, and the design concept that the thickness of the first part 12a is less than the thickness of the second part 12b can also be achieved.

[0055] Furthermore, refer to Figure 5 As shown, in some embodiments, a buffer groove 12d is provided on the second part 12b. The buffer groove 12d is annular and is used to reduce the thermal conductivity of the cover plate body 1.

[0056] Specifically, in the technical solution adopted in this application, the buffer groove 12d is annular and is formed on the second part 12b to form a closed-loop structure around the surface of the second part 12b, thereby disrupting the flatness of the surface of the second part 12b to achieve the effect of heat insulation.

[0057] Furthermore, refer to Figure 5 As shown, in some embodiments, the number of buffer grooves 12d is at least two, and the two buffer grooves 12d are arranged opposite to each other on the first surface 101 and the second surface 102.

[0058] Specifically, in the technical solution adopted in this application, two or more buffer grooves 12d can be provided on the second part 12b. Each buffer groove 12d can be in pairs, with the two buffer grooves 12d in the same pair located on opposite surfaces of the second part 12b, namely the first surface 101 and the second surface 102 of the cover plate body 1. The two buffer grooves 12d are arranged opposite each other, thereby releasing some of the stress applied to the cover plate body 1 through the two opposite buffer grooves 12d. During the production process, the cover plate body 1 may undergo bending deformation, which may affect the explosion-proof area 12. Specifically, the bending deformation of the cover plate body 1 during production will cause tensile deformation of the explosion-proof structure, thereby affecting the normal explosion-proof structure. However, after adding buffer grooves 12d to the second part 12b, the stress generated by the bending deformation of the cover plate body 1 is directly released by the buffer grooves, thus effectively avoiding the adverse effects of the bending deformation of the cover plate body 1 during production on the explosion-proof area 12. In this embodiment, the groove of the buffer groove 12d can be set as V-shaped with an angle of 90 degrees, and the groove depth can be controlled between 0.1 and 0.15 mm. Measurement shows that when the groove depth of the buffer groove 12d is less than 0.1 mm, the heat blocking effect is not obvious, while when the groove depth of the buffer groove 12d is greater than 0.15 mm, the structural strength of the second part 12b is insufficient, and it is easy to deform and twist.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.

[0062] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0063] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware, the program being stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.

[0064] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.

[0065] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A light cover plate, characterized in that, include: The cover plate body has a first surface and a second surface arranged opposite to each other; The cover plate body is provided with two first through holes, and the two first through holes are respectively used to accommodate one end of the pole piece, so that the end face of the corresponding pole piece can be exposed on the first surface through the first through holes. The cover plate body is provided with a fixing ring corresponding to the two first through holes. The fixing ring is connected to the second surface and is used to limit the installation of the pole piece. The fixing ring has a second through hole at the end facing away from the second surface so that the end face of the pole piece facing away from the first through hole can be exposed on the second surface through the second through hole. The cover plate body also has an explosion-proof area located between the two first through holes. The explosion-proof area has two explosion-proof structures. The structural strength of the explosion-proof structure is weaker than the structural strength of the rest of the cover plate body. Both explosion-proof structures are annular, so as to form a first explosion-proof part and a second explosion-proof part on the explosion-proof area respectively. When the explosion-proof structure is in a broken state, at least one of the first explosion-proof part and the second explosion-proof part separates from the cover plate body.

2. The cover plate according to claim 1, characterized in that, The fixed ring body is bent to form a first limiting wall and a second limiting wall; The first limiting wall is perpendicular to the second surface; The second limiting wall extends toward the center of the first limiting wall and is parallel to the second surface to form a limiting groove in the fixed ring, and the pole piece is embedded in the limiting groove.

3. The light cover plate according to claim 1 or 2, characterized in that, The cover plate body has a relief groove located on the first surface, and the first through hole is located in the center of the relief groove and communicates with the relief groove. A groove-shaped limiting structure is arranged circumferentially on the inner wall of the first through hole, the limiting structure being used to engage with the radial side of the pole piece.

4. The cover plate according to claim 1, characterized in that, The area of ​​the second explosion-proof part is smaller than that of the first explosion-proof part, and the second explosion-proof part is disposed in the first explosion-proof part.

5. The cover plate according to claim 4, characterized in that, At least two annular grooves are formed on the first surface in the explosion-proof area, so as to form two explosion-proof structures between the bottom of the two annular grooves and the second surface, respectively.

6. The cover plate according to claim 5, characterized in that, The annular groove is a straight groove, and the groove body of the annular groove is configured as a wedge shape that gradually expands in size from the bottom to the opening.

7. The cover plate according to claim 1, characterized in that, The explosion-proof zone includes: The first part, wherein the first explosion-proof part and the second explosion-proof part are located on the first part; The second part is connected to the first part, and the second part is a ring that surrounds the outer periphery of the first part; The first part and the second part have a ribbed structure, which is used to reduce the thermal conductivity of the cover plate body.

8. The cover plate according to claim 7, characterized in that, The thickness of the first part is less than the thickness of the second part, so that the convex rib structure is formed by the height difference between the second part and the first part; or, The thickness of the first part is greater than the thickness of the second part, so that the convex structure is formed by the height difference between the first part and the second part.

9. The cover plate according to claim 7 or 8, characterized in that, The second part has a buffer groove, which is annular, to reduce the thermal conductivity of the cover plate body.

10. The cover plate according to claim 9, characterized in that, The number of buffer grooves is at least two, and the two buffer grooves are arranged opposite to each other on the first surface and the second surface.

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