Cover assembly and electric appliance

Abstract

The application relates to the technical field of power batteries, and provides a cover plate assembly and an electric device. The cover plate assembly comprises a cover plate and a lower plastic arranged on one side of the cover plate in the thickness direction; the cover plate is in a strip shape, and the cover plate is provided with a pole post at positions close to both ends in the length direction of the cover plate; the lower plastic comprises a lower plastic body arranged on one side of the cover plate in the thickness direction and a protection part connected to both ends of the lower plastic body in the length direction of the cover plate; the protection parts at both ends are connected to the cover plate through the through holes in the lower plastic body and are connected through clamping, and are arranged at least at the pole posts at the corresponding ends; the middle parts of the protection parts are convex towards the side away from the cover plate in the thickness direction of the cover plate, and can form grooves. According to the cover plate assembly, the protection parts can be connected to the cover plate through clamping, the stability and reliability of the connection are high, the risk that the welding slag pierces the diaphragm of the pole group is reduced, and the use reliability of the power battery is improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a cover plate assembly. This application also relates to electrical equipment using the cover plate assembly. Background Technology

[0002] A power battery mainly consists of a battery casing and electrode assemblies housed within the casing. The battery casing includes a main body that encloses a cavity and a cover plate. The terminals are fixed to the cover plate, and the electrode assemblies are placed within the cavity. During power battery assembly, the electrode tabs of the electrode assemblies need to be connected to the terminals on the cover plate by welding to establish a complete current path.

[0003] However, welding slag may form during the welding process between the tabs and the terminals. In harsh environments, this slag may puncture the separator, causing the positive and negative electrodes of the electrode assembly to connect, resulting in a short circuit. In severe cases, this can lead to thermal runaway of the power battery, which is detrimental to improving the reliability of the power battery. Utility Model Content

[0004] In view of this, this application aims to propose a cover assembly to improve the reliability of power batteries.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly includes a cover plate and a lower plastic material disposed on one side of the cover plate in the thickness direction; The cover plate is long and narrow, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to be welded to the pole lug in the pole group. The lower plastic includes a lower plastic body disposed on one side of the cover plate in the thickness direction, and two protective parts respectively connected to both ends of the lower plastic body along the length direction of the cover plate; The lower plastic body can insulate each of the poles from the cover plate respectively; each of the protective parts is provided with a buckle, and the lower plastic body is provided with a through hole corresponding to the buckle; the protective part can be bent to one side of the lower plastic body and at least block the pole at the corresponding end; the snap-fit ​​part of the buckle can pass through the corresponding through hole and snap-fit ​​with the cover plate. The middle part of each of the protective parts protrudes along the thickness direction of the cover plate toward the side away from the cover plate, thereby forming a groove, the opening of the groove facing the lower plastic body.

[0006] Furthermore, each of the protective parts is connected to the lower plastic body through a bending portion, and each of the protective parts, each of the bending portions, and the lower plastic body are integrally formed by injection molding.

[0007] Furthermore, the lower plastic body is conformally disposed to the cover plate, and the bent portion is located in the middle of the protective portion along the width direction of the cover plate.

[0008] Furthermore, the bent portion is provided with a rubber-reducing groove; and / or, the bent portion is provided with a through hole.

[0009] Furthermore, the cover plate is provided with a snap-fit ​​hole, which is a blind hole, and the snap-fit ​​part of the buckle can pass through the through hole and be snapped into the snap-fit ​​hole.

[0010] Furthermore, the lower plastic body has a first protrusion protruding toward the protective portion, and the through hole is located at the first protrusion and penetrates the lower plastic body.

[0011] Furthermore, the cover plate is provided with mounting holes for each of the pole posts to pass through, and a sealing ring is provided between each pole post and the cover plate to seal the gap between them; the pole post includes a cylindrical pole post body, and a first boss and a second boss provided on the outer periphery of the pole post body; in a direction orthogonal to the axial direction of the pole post body, the first boss and the second boss both protrude outward from the pole post body, and the outer diameter of the first boss and the outer diameter of the second boss are both larger than the diameter of the mounting hole.

[0012] Furthermore, the mounting hole includes a first mounting hole and a second mounting hole that are connected to each other; the diameter of the first mounting hole is smaller than the diameter of the second mounting hole, and the second mounting hole is located on the side of the cover plate facing the lower plastic; the sealing ring is installed at the first mounting hole, and the lower plastic body is provided with a second protrusion that is embedded in the second mounting hole, and the second protrusion surrounds the periphery of the pole post.

[0013] Furthermore, each of the protective portions has a central region corresponding to the electrode post and an edge region surrounding the central region; the groove is formed by recessing the central region toward the side away from the lower plastic body, and the central region is used to press against the electrode assembly.

[0014] Compared with the prior art, this application has the following advantages: (1) The cover plate assembly described in this application includes a lower plastic body and two protective parts located at both ends in the length direction. The cover plate is connected to the lower plastic body by the buckles on the two protective parts. The connection between the cover plate and each protective part is highly reliable, so that each protective part can be firmly placed on the corresponding terminal post. When applied to power batteries, it can better prevent the welding slag of the terminal post and the tab from piercing the separator. The groove provided can provide sufficient space to cover the welding parts of the terminal post and the tab, which can further prevent the separator from being pierced and further reduce the risk of piercing the separator, thereby improving the safety and reliability of the power battery.

[0015] Each protective component is snap-fitted to the cover plate, a quick-connect method that eliminates the need for complex tools and procedures compared to traditional threaded or welded connections. Using this snap-fit ​​method, the protective component is easily assembled with a simple push or press after aligning with the lower plastic body, significantly improving production efficiency. Similarly, when disassembly, repair, or replacement of the protective component is required, simply applying external force to release the snap-fit ​​allows for easy and quick removal. Because the snap-fit ​​operation is simple and easy to learn, requiring minimal skill from operators, companies do not need to invest significant time and resources in professional employee training. This allows for more flexible staffing and reduces labor costs. Furthermore, the rapid assembly and disassembly process shortens the production cycle, increases equipment utilization, and further reduces production costs.

[0016] (2) The protective part is connected to the lower plastic body through the bending part, so that the protective part can be bent relative to the lower plastic body through the bending part, and it is easy to ensure the fit between the protective part and the lower plastic body. It plays a certain role in fixing and shaping the tab, and can effectively reduce the risk of tab tearing. The protective part, the bending part and the lower plastic body are integrally formed by injection molding, which is convenient to process. This integrated lower plastic is also convenient to assemble and use during application, which can reduce the number of parts and facilitate management. At the same time, the lower plastic processed by injection molding has good insulation and protection properties, and is not easily punctured by the welding slag of the pole and the tab, thus effectively reducing the risk of welding slag puncturing the diaphragm.

[0017] (3) The lower plastic body is set to conform to the shape of the cover plate, and the bent part is located in the middle of the protective part in the width direction of the cover plate. This layout allows the lower plastic to better fit the shape of the cover plate, improves space utilization, and at the same time, the reasonable position distribution helps to evenly disperse external forces, avoid local stress concentration, and further improve the stability and reliability of the overall structure. The bent part uses less material, which helps to save costs.

[0018] (4) Setting a rubber reduction groove on the bending part and a through hole on the bending part are both easy to process and facilitate the smooth bending of the bending part. The material consumption is also better, which helps to save costs.

[0019] (5) The snap-fit ​​hole on the cover is set as a blind hole. There is no need to worry about electrolyte leakage at the snap-fit ​​hole, nor is there any need to worry about external impurities entering the power battery through the snap-fit ​​hole. This can improve the safety and reliability of the cover application. The snap-fit ​​part will not be exposed, which can better ensure the appearance quality of the cover.

[0020] (6) By setting a first protrusion on the lower plastic body and setting the through hole in the first protrusion and penetrating the lower plastic body, the thickness of the through hole can be increased. When the cover plate and the protective part are snapped together, the hole wall of the through hole can play a certain fixing role on the buckle in the radial direction of the buckle, which can better prevent the buckle from shaking and prevent the buckle from coming out of the snap hole, thereby further improving the stability and reliability of the snap-connection between the cover plate and the protective part.

[0021] (7) The terminal post includes a terminal post body, a first boss, and a second boss. The outer diameters of the first boss and the second boss are both larger than the diameter of the mounting hole, so that the terminal post can be stably installed on the cover plate, thereby improving the installability and reliability of the power battery application. The sealing ring can improve the sealing performance of the gap between the cover plate and the terminal post, prevent electrolyte leakage, and prevent external impurities from entering the power battery through the mounting hole, thereby further improving the installability and reliability of the power battery application.

[0022] (8) The mounting holes include a first mounting hole and a second mounting hole that are connected. The diameter of the first mounting hole is limited to be smaller than that of the second mounting hole. The second mounting hole is located on the side of the cover plate facing the lower plastic relative to the first mounting hole. A sealing ring is installed at the first mounting hole to form a first seal. The second protrusion on the lower plastic body is embedded at the second mounting hole to form a second seal. A total of two seals are formed, and the two seals are stepped, which can better improve the sealing effect between the cover plate and the pole.

[0023] (9) The central region is recessed towards the side away from the cover plate to form a cavity. The structure is simple, easy to process, and uses less material. When this electrode assembly is applied to a power battery, the central region can easily abut against the electrode assembly inside the power battery, which can limit the electrode assembly and help to attenuate the vibration of the electrode assembly, thereby reducing the risk of the tab tearing and puncturing the separator.

[0024] Another objective of this application is to provide an electrical device in which the aforementioned cover assembly is applied to the power battery.

[0025] The electrical equipment described in this application, by using a power battery with the aforementioned cover assembly, can reduce the risk of welding slag puncturing the separator, thereby reducing the possibility of internal short circuits in the battery. This is beneficial for ensuring the normal operation of the electrical equipment, improving the safety and reliability of the power battery, and enhancing the reliability of the electrical equipment and the user experience. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exemplary structural diagram of the cover plate assembly described in the embodiments of this application in an application state; Figure 2 for Figure 1 Top view; Figure 3 For along Figure 2 Sectional view of line AA in the middle; Figure 4 for Figure 3 A magnified view of part C in the middle; Figure 5 For along Figure 2 Sectional view of the middle BB line; Figure 6 Figure 5 A magnified view of part D in the middle; Figure 7 This is an exemplary structural diagram illustrating the assembly process of the cover plate, lower plastic, and electrode assembly as described in the embodiments of this application. Figure 8 for Figure 7 A cross-sectional view of the middle protective section bent to one side of the lower plastic body; Figure 9 This is a schematic diagram of an exemplary structure of the plastic material described in an embodiment of this application; Figure 10 for Figure 9 A structural diagram from another perspective; Figure 11 This is a schematic diagram of an exemplary structure in which the cover plate and the lower plastic assembly are assembled together, as described in an embodiment of this application. Figure 12 for Figure 11 A magnified view of part E in the middle; Figure 13 for Figure 11 A magnified view of part F in the middle section.

[0027] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Snap-fit ​​hole; 102. Third mounting hole; 103. Mounting hole; 104. Third protrusion; 1011, First card slot; 1012, Second card slot; 1031, First mounting hole; 1032, Second mounting hole; 2. Pole post; 201. Pole post body; 202. First boss; 203. Second boss; 3. Electrode assembly; 301. Electrode tab; 4. Lower plastic body; 401. Through hole; 402. First protrusion; 403. Second protrusion; 404. Opening; 405. Protrusion; 4051. Cavity; 5. Protective components; 501. Buckle; 502. Groove; 503. Central area; 504. Edge area; 505. Connecting rib; 506. Through hole; 5011, Snap-on; 50111, Snap-on Block; 50112, Connecting Block; 50113, Guide Part; 6. Bending section; 601. Glue reduction groove; 7. Explosion-proof valve; 8. Protective membrane; 9. Top plastic; 10. Sealing ring. Detailed Implementation

[0028] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0030] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0032] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0034] An embodiment of the first aspect of this application provides a cover assembly to reduce the short-circuit risk of a power battery and improve its safety.

[0035] In related technologies, the welding process between the tabs and the cover plate plays a crucial role in the battery manufacturing process, and is one of the core links that determines the final quality of the battery. The welding quality of this process is closely and directly related to the safety and electrochemical performance of the battery, and its quality plays a decisive role in whether the battery can operate stably and safely in complex and changing usage environments.

[0036] A deep analysis at the microscopic level of the battery reveals that the separator, as a key functional component for effectively isolating the positive and negative electrodes, is crucial for the safe and stable operation of the battery due to its material properties and structural integrity. Separators are typically made of insulating materials with specific porosity and mechanical strength. Their function is to strictly prevent direct contact between the positive and negative electrodes while ensuring normal ion transport, thereby maintaining the orderly conduct of electrochemical reactions within the battery.

[0037] However, during the welding process of the electrode tab and the cover plate, welding slag is easily generated at the welding site due to factors such as slight fluctuations in welding process parameters (e.g., welding current, welding time, welding pressure), precision deviations of welding equipment, and differences in the skill level of operators. The morphology, size, and distribution of these welding slags are uncertain, and they may exist in the welding area as tiny particles, flakes, or irregular shapes.

[0038] During subsequent assembly, transportation, or use of the battery, if it detaches or shifts due to factors such as minor internal vibrations, stress changes, or external impacts, welding slag is highly likely to cause physical puncture damage to the separator. Once the separator is punctured by welding slag, the isolation between the positive and negative electrodes maintained by the separator will be broken, and the positive and negative electrodes will directly make electrical contact, thus causing a short circuit fault.

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

[0040] At the same time, the positive and negative electrode materials of the battery will also decompose under high temperature conditions. Positive electrode materials (such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, etc.) and negative electrode materials (such as graphite, silicon-based materials, etc.) will undergo structural phase transitions and redox reactions at high temperatures, which will lead to the destruction of the crystal structure of the electrode materials and the loss of active materials, thereby causing irreversible capacity decay and deterioration of charge and discharge performance.

[0041] As the aforementioned chain chemical reaction continues, the internal temperature of the battery will continue to rise, potentially leading to thermal runaway. Thermal runaway is a highly destructive battery failure mode, characterized by a rapid increase in internal temperature and pressure, which can cause the battery casing to rupture, burn, or even explode. Thermal runaway not only completely destroys the battery, rendering it unusable, but the flames, high temperatures from combustion, and the shockwaves and debris from an explosion can also cause severe damage to surrounding infrastructure and pose a direct threat to the lives of operators and those nearby.

[0042] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 6 As shown, the overall design includes a cover plate 1 and a lower plastic part located on one side of the cover plate 1 in the thickness direction.

[0043] The cover plate 1 is elongated, and pole posts 2 are inserted at both ends of the cover plate 1 near its own length direction. Each pole post 2 is used to weld to the pole lug 301 in the pole group 3. The lower plastic includes a lower plastic body 4 located on one side of the cover plate 1 in the thickness direction, and two protective parts 5 connected to both ends of the lower plastic body 4 along the length direction of the cover plate 1.

[0044] The lower plastic body 4 can insulate each pole post 2 from the cover plate 1 respectively; each protective part 5 is provided with a buckle 501, and the lower plastic body 4 is provided with a through hole 401 corresponding to the buckle 501; the protective part 5 can be bent to one side of the lower plastic body 4 and at least block the pole post 2 at the corresponding end, and the snap-fit ​​part of the buckle 501 can pass through the corresponding through hole 401 and snap-fit ​​with the cover plate 1; the middle part of each protective part 5 protrudes along the thickness direction of the cover plate 1 towards the side away from the cover plate 1, and can form a groove 502, the groove opening of the groove 502 facing the lower plastic body 4.

[0045] Therefore, by setting the cover plate 1 and the lower plastic, the lower plastic body 4 of the lower plastic insulates the pole post 2 from the cover plate 1, which can prevent the risk of short circuit. The protective part 5 is placed between the pole group 3 and the pole post 2, which can block the welding slag generated during the welding process of the pole tab 301 and the pole post 2, and reduce the risk of welding slag piercing the diaphragm of the pole group 3.

[0046] The cover assembly described above comprises a lower plastic body 4 and two protective portions 5 located at both ends along its length. The two protective portions 5 are connected to the cover 1 by clips 501 on the lower plastic body 4. The reliable connection between the cover 1 and the protective portions 5 ensures that the protective portions 5 can be securely positioned at the corresponding terminal post 2. When applied to power batteries, this effectively prevents welding slag from the terminal post 2 and the tab 301 from piercing the separator. The groove 502 can accommodate the welding slag generated during the welding process, providing sufficient space to cover the welding area of ​​the terminal post 2 and the tab 301, further reducing the risk of piercing the separator and effectively preventing short circuits caused by welding slag piercing the separator, thus improving the safety and reliability of the power battery.

[0047] Each protective component 5 is snap-fitted to the cover plate 1, a quick-connect method that eliminates the need for complex tools and procedures compared to traditional threaded connections or welding. Using this snap-fit ​​method, once the protective component 5 is aligned with the lower plastic body 4 and the cover plate 1, assembly can be completed with a gentle push or press, significantly improving production efficiency. Similarly, when disassembly, maintenance, or replacement of the protective component 5 is required, simply applying a certain amount of external force to release the snap-fit ​​connection allows for easy and quick removal of the protective component 5.

[0048] Because snap-fit ​​operations are simple and easy to learn, requiring minimal skill from operators, companies do not need to invest significant time and resources in professional employee training. This allows for more flexible staffing and reduces labor costs. Simultaneously, the rapid assembly and disassembly process shortens production cycles and increases equipment utilization, further reducing production costs.

[0049] To better understand the cover assembly of this embodiment, the structure of the power battery will be briefly described first. Generally speaking, a power battery includes a battery casing and an electrode assembly 3 located within the battery casing. The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator sandwiched between the positive and negative electrode. The battery casing generally includes a casing body with a receiving cavity open on one side. The cover assembly seals one side of the opening to form a sealed receiving cavity, and the aforementioned electrode assembly 3 is located within the receiving cavity.

[0050] In the preferred implementation, such as Figure 3 As shown, the cover plate 1 has a third mounting hole 102 in the middle for installing the explosion-proof valve 7. The explosion-proof valve 7 is installed in the third mounting hole 102, and a protective film 8 is sealed in the third mounting hole 102. The protective film 8 can be an existing waterproof and breathable film. The protective film 8 is placed on the outside of the explosion-proof valve 7 and can play a good role in waterproofing and breathability.

[0051] There is one third mounting hole 102 for installing the explosion-proof valve 7, located in the middle of the length of the cover plate 1. Mounting holes 103 are provided on both sides of the third mounting hole 102, and each mounting hole 103 is used to install the pole post 2. More specifically, there are two mounting holes 103, each containing a pole post 2. The two mounting holes 103 are located on both sides of the third mounting hole 102, and the lower plastic body 4 has openings 404 corresponding to and communicating with each mounting hole 103.

[0052] Based on the above overview, specifically, after the protective part 5 is engaged with the lower plastic body 4, it can block the tabs 301 on the side away from the cover plate 1. Because the protective parts 5 are provided at both ends of the lower plastic body 4, the two protective parts 5 of a single lower plastic body can block the two tabs 301 of a pole group 3, or they can block the four tabs 301 of two pole groups 3.

[0053] Figure 8 The diagram shows a single lower plastic sheet shielding the four tabs 301 of the two electrode groups 3. Figure 8 The diagram shows two pole groups 3. In this case, each pole post 2 is welded to two tabs 301, and each protective part 5 shields the two tabs 301 welded to the same pole post 2. When there is only one pole group 3, each pole group 3 has two tabs 301. Since there are also two pole posts 2, the two tabs 301 are welded to the two pole posts 2 in a one-to-one correspondence, and the two protective parts 5 shield the two pole posts 2 respectively.

[0054] It should be noted that, in the preferred embodiment, the number of grooves 502 is the same as the number of tabs 301. That is, the grooves 502 and tabs 301 correspond one-to-one, and each groove 502 corresponds to a welding point between a tab 301 and a post 2. Figure 7 As shown, when the two protective parts 5 of the single lower plastic cover shield the four tabs 301 of the two pole groups 3, the tabs 301 of the two pole groups 3 can be connected to the corresponding pole posts 2 from both sides of the cover plate 1 in the width direction.

[0055] It should also be noted that the electrode post 2 and the cover plate 1 are insulated from each other. The specific structure of the electrode post 2 and the installation method of the electrode post 2 on the cover plate 1 are described in detail below. The structure of the lower plastic body 4 can refer to the existing lower plastic structure, which is used to insulate the electrode post 2 and the cover plate 1, and the connection method between the lower plastic body 4 and the cover plate 1 can still refer to the existing technology.

[0056] Continue to combine Figures 9 to 11 As shown, in some exemplary embodiments, each protective part 5 is connected to the lower plastic body 4 via a bending part 6, and each protective part 5, each bending part 6, and the lower plastic body 4 are integrally formed by injection molding.

[0057] In this way, the protective part 5 is connected to the lower plastic body 4 via the bent part 6, and is integrally molded using injection molding. This simplifies the manufacturing process and reduces assembly steps. Simultaneously, the integrally molded structure enhances the connection strength between the protective part 5, the bent part 6, and the lower plastic body 4, making the lower plastic more robust and less prone to damage. This helps ensure the long-term stable performance of the lower plastic's protective function. Furthermore, the integral processing method is simple, saving on assembly efficiency and management and assembly costs. At the same time, the protective part 5 uses the same material as the lower plastic body 4, such as PP (described below), which also has good insulation properties and protective effects, effectively reducing the risk of puncturing the diaphragm.

[0058] Based on the integral molding of the protective part 5, the bending part 6 and the lower plastic body 4, in some exemplary embodiments, the lower plastic body 4 is conformally disposed to the cover plate 1, and the bending part 6 is located in the middle of the protective part 5 along the width direction of the cover plate 1.

[0059] In this way, the lower plastic body 4 is set to conform to the shape of the cover plate 1, and the bent part 6 is located in the middle of the protective part 5 in the width direction of the cover plate 1. This layout allows the lower plastic to better fit the shape of the cover plate 1, improves space utilization, and the edge of the groove 502 can press the electrode tab 301, which can play a good role in fixing and shaping the electrode tab 301. At the same time, the reasonable position distribution helps to evenly disperse the external force, avoid local stress concentration, and further improve the stability and reliability of the overall structure.

[0060] Preferably, in the width direction of the cover plate 1, the bent portion 6 is located in the middle of the protective portion 5, so that the size of the bent portion 6 is smaller than the size of the protective portion 5, which can reduce the size of the connection between the lower plastic body 4 and the protective portion, save materials, and also facilitate bending the protective portion 5 to the lower plastic body 4, reducing bending resistance.

[0061] In some exemplary embodiments, the bent portion 6 is provided with a glue-reducing groove 601, such as... Figure 11 and Figure 12 As shown, the bent portion 6 extends along the length of the cover plate 1. A glue-reducing groove 601 is provided on one side of the bent portion 6 and extends along the extension direction of the bent portion 6, thus facilitating smooth bending of the bent portion. It should be understood that, in addition to this, glue-reducing grooves 601 can be provided on both sides of the bent portion 6, or the glue-reducing grooves 601 can be omitted. Here, the glue-reducing groove 601 provided on the bent portion 6 is convenient to process and facilitates smooth bending of the bent portion.

[0062] In some exemplary embodiments, the bent portion 6 is provided with a through hole, for example, the through hole extends along the extending direction of the bent portion 6. Here, the through hole provided on the bent portion 6 is easy to process and facilitates smooth bending of the bent portion. In this embodiment, there is no specific limitation on the number and shape of the through holes.

[0063] like Figure 3 and Figure 4 As shown, in some exemplary embodiments, the cover plate 1 is provided with a snap-fit ​​hole 101, which is a blind hole, and the snap-fit ​​part of the buckle 501 can pass through the through hole 401 and be snapped into the snap-fit ​​hole 101.

[0064] Here, the snap-fit ​​hole 101 on the cover plate 1 is set as a blind hole, so there is no need to worry about electrolyte leakage at the snap-fit ​​hole 101, nor is there any need to worry about external impurities entering the power battery through the snap-fit ​​hole 101. This can improve the safety and reliability of the cover plate assembly. The buckle 501 part will not be exposed, which can better ensure the appearance quality of the cover plate 1.

[0065] For example Figures 7 to 11 As shown, each protective part 5 has one buckle 501. The snap-fit ​​holes 101 on the cover plate 1 correspond one-to-one with the buckles 501, and the through holes 401 on the lower plastic body 4 correspond one-to-one with the buckles 501. When the protective part 5 is bent to one side of the lower plastic body 4, the corresponding buckles 501 and snap-fit ​​holes 101 snap together. For ease of description, a set of buckles 501 and snap-fit ​​holes 101 snapped together is referred to as a set of snap-fit ​​structures.

[0066] In the preferred embodiment, continue Figures 9 to 11 As shown, when the protective part 5 is bent to one side of the lower plastic body 4, one end of the protective part 5 is connected to the lower plastic body 4 through the bending part 6, and the other end of the protective part 5 is connected to the cover plate 1 through the snap-fit ​​structure, which helps to ensure the fit between the protective part 5 and the lower plastic body 4 after snap-fitting, and can play a better role in fixing and shaping the tab 301.

[0067] It should be understood that the number of snap-fit ​​structures between each protective part 5 and the lower plastic body 4 can be one set, or other sets, such as two sets, three sets, five sets, etc. These snap-fit ​​structures can be arranged around the periphery of the pole post 2.

[0068] A snap-fit ​​501 is provided on the protective part 5, and a snap-fit ​​hole 101 is provided on the cover plate 1. When the snap-fit ​​501 is engaged in the snap-fit ​​hole 101, a tight fit is formed between the two. The reasonable design of the snap-fit ​​501 and the snap-fit ​​hole 101 can provide sufficient friction and mechanical locking force to ensure that the cover plate 1 and the protective part 5 will not easily separate when subjected to normal external force.

[0069] Reference Figures 3 to 6 , Figure 11 and Figure 13 As shown, in order to improve the snap-fit ​​effect, in some exemplary embodiments, the snap fastener 501 includes a snap-fit ​​part and a connecting part that connects the snap-fit ​​part to the protective part 5. The snap-fit ​​hole 101 includes a first snap-fit ​​hole 1011 and a second snap-fit ​​hole 1012 that are connected. The diameter of the first snap-fit ​​hole 1011 is smaller than the diameter of the second snap-fit ​​hole 1012. The connecting part is provided through the first snap-fit ​​hole 1011 and the through hole 401, and the snap-fit ​​part is snapped into the second snap-fit ​​hole 1012.

[0070] The buckle 501 includes a snap-fit ​​part and a connecting part, and the snap-fit ​​hole 101 includes a first snap-fit ​​hole 1011 and a second snap-fit ​​hole 1012 with different diameters. When the connecting part passes through the first snap-fit ​​hole 1011 and the through hole 401, the snap-fit ​​part is snapped into the second snap-fit ​​hole 1012, so that the buckle 501 can be firmly fixed in the snap-fit ​​hole 101, which helps to improve the reliability of the snap-fit ​​connection between the cover plate 1 and the protective part 5.

[0071] In some exemplary embodiments, the buckle 501 includes a plurality of sub-buckles 5011 arranged circumferentially along the snap-fit ​​hole 101. Each sub-buckle 5011 has a connecting block 50112 connected to the protective part 5, and a snap-fit ​​block 50111 protruding radially outward from the connecting block 50112. The buckle 501 is snapped onto the cover plate 1 by the snap-fit ​​block 50111. Each connecting block 50112 together constitutes the aforementioned connecting part, and each snap-fit ​​block 50111 together constitutes the aforementioned snap-fit ​​part.

[0072] The buckle 501 includes multiple sub-buckles 5011, each of which includes a snap-fit ​​block 50111 and a connecting block 50112. The multiple snap-fit ​​blocks 50111 together form a snap-fit ​​part, and the multiple connecting blocks 50112 together form a connecting part. When the buckle 501 is snapped into the snap-fit ​​hole 101, the multiple snap-fit ​​blocks 50111 are offset together towards the center line of the buckle 501, so that the snap-fit ​​hole 101 can be smoothly snapped into the snap-fit ​​hole 101. The snap-fit ​​process is convenient. After the snap-fit ​​is completed, each snap-fit ​​block 50111 is reset under the action of its respective connecting block 50112, so that the buckle 501 can be firmly snapped into the snap-fit ​​hole 101. The reliability and stability of the snap-fit ​​are high.

[0073] In one example, the cross-sections of the first snap-fit ​​hole 1011 and the second snap-fit ​​hole 1012 are both circular, as are the cross-sections of the connecting part and the snap-fit ​​part. In the above structure, the buckle 501 includes a snap-fit ​​part and a connecting part, while the snap-fit ​​hole 101 includes a first snap-fit ​​hole 1011 and a second snap-fit ​​hole 1012 with different diameters. The connecting part is inserted into the first snap-fit ​​hole 1011, and the snap-fit ​​part is snapped into the second snap-fit ​​hole 1012, allowing the buckle 501 to be securely fixed in the snap-fit ​​hole 101, thus improving the reliability of the snap-fit ​​connection between the cover plate 1 and the protective part 5.

[0074] It should be noted that when the snap fastener 501 is engaged in the snap-fit ​​hole 101, the center line of the snap fastener 501 is collinear with the axial center line of the snap-fit ​​hole 101. In some examples, such as Figure 13 As shown, there are four sub-clamps 5011. The cross-section of the snap-fit ​​part of each sub-clamp 5011 is a fan shape with a central angle of 90°, and the cross-section of the connecting part of each sub-clamp 5011 is also a fan shape with a central angle of 90°.

[0075] It is worth mentioning that, in order to facilitate the snap fastener 501 being snapped into the snap-fit ​​hole 101, in a preferred embodiment, the end of the snap-fit ​​part that is first inserted into the snap-fit ​​hole 101 is provided with a guide part 50113, which is used to guide the snap fastener 501 to be snapped into the snap-fit ​​hole 101.

[0076] In specific implementation, the guide portion 50113 can be a chamfer or rounded corner provided on the edge of the snap-fit ​​portion to facilitate the smooth insertion of the snap-fit ​​501 into the snap-fit ​​hole 101. For example, in this embodiment, the edge of each snap-fit ​​5011 away from the protective portion 5 is provided with a chamfer, which helps to increase the speed at which the snap-fit ​​501 is snapped into the snap-fit ​​hole 101.

[0077] Continue to refer to Figure 3 and Figure 4 As shown, in some exemplary embodiments, the lower plastic body 4 has a first protrusion 402 protruding toward the protective portion 5, and a through hole 401 is provided at the first protrusion 402 and extends through the lower plastic body 4.

[0078] Here, by setting a first protrusion 402 on the lower plastic body 4 and setting a through hole 401 at the first protrusion 402 and passing through the lower plastic body 4, the thickness of the through hole 401 can be increased. When the cover plate 1 and the protective part 5 are snapped together, the hole wall of the through hole 401 can play a certain fixing role on the buckle 501 in the radial direction, which can better prevent the buckle 501 from shaking and prevent the buckle 501 from coming out of the snap hole 101, thereby further improving the stability and reliability of the snap-connection between the cover plate 1 and the protective part 5.

[0079] Continue to refer to Figure 4 As shown, a guide portion 50113 is provided at one end of the through hole 401 facing the protective portion 5. The guide portion 50113 is rounded or chamfered, so that the buckle 501 can pass through the through hole 401 smoothly and quickly, thereby facilitating the buckle 501's snap-fit ​​portion to snap into the snap-fit ​​hole 101.

[0080] Reference Figures 3 to 6 As shown, in some exemplary embodiments, the cover plate 1 has a mounting hole 103 through which the pole post 2 passes, and a sealing ring 10 is provided between the pole post 2 and the cover plate 1 to seal the gap between them.

[0081] In terms of specific structure, the pole post 2 includes a cylindrical pole post body 201, and a first boss 202 and a second boss 203 disposed on the outer periphery of the pole post body 201; in a direction orthogonal to the axial direction of the pole post body 201, the first boss 202 and the second boss 203 both protrude outward from the pole post body 201, and the outer diameter of the first boss 202 and the outer diameter of the second boss 203 are both larger than the diameter of the mounting hole 103.

[0082] Here, the terminal post 2 includes a terminal post body 201, a first protrusion 202, and a second protrusion 203. The outer diameters of both the first protrusion 202 and the second protrusion 203 are larger than the diameter of the mounting hole 103, allowing the terminal post 2 to be securely mounted on the cover plate 1, thereby improving the installability and reliability of the power battery application. The sealing ring 10 effectively improves the sealing performance of the gap between the cover plate 1 and the terminal post 2, preventing electrolyte leakage and preventing external impurities from entering the power battery through the mounting hole 103, further enhancing the installability and reliability of the power battery application.

[0083] It should be noted that, referring to Figure 3 and Figure 4 As shown, the sealing ring 10 with an "L" shaped cross-section can be inserted into the mounting hole 103 from bottom to top. When the first boss 202 is processed, it can extend along the axial direction of the pole body 201. The pole 2 passes through the sealing ring 10 and the mounting hole 103 from bottom to top. The upper plastic 9 is fitted onto the pole body 201, and the upper plastic 9 is partially inserted into the gap between the pole 2 and the cover plate 1. Then the first boss 202 is bent to press the upper plastic 9 tightly, and the installation process of the pole 2 can be completed.

[0084] In some exemplary embodiments, each mounting hole 103 includes a first mounting hole 1031 and a second mounting hole 1032 that are connected; the diameter of the first mounting hole 1031 is smaller than the diameter of the second mounting hole 1032, and the second mounting hole 1032 is located on the side of the cover plate 1 facing the lower plastic; the sealing ring 10 is installed at the first mounting hole 1031, and the lower plastic body 4 is provided with a second protrusion 403 embedded in the second mounting hole 1032, and the second protrusion 403 surrounds the periphery of the pole post 2.

[0085] Here, the mounting hole 103 includes a first mounting hole 1031 and a second mounting hole 1032 that are connected. The diameter of the first mounting hole 1031 is smaller than the diameter of the second mounting hole 1032. The second mounting hole 1032 is located on the side of the cover plate 1 facing downwards relative to the first mounting hole 1031. The sealing ring 10 is installed at the first mounting hole 1031 to form a first seal. The second protrusion 403 on the lower plastic body 4 is embedded at the second mounting hole 1032 to form a second seal. A total of two seals are formed, and the two seals are stepped, which can better improve the sealing effect between the cover plate 1 and the pole post 2.

[0086] Continue to refer to Figures 3 to 4 As shown, in one example, the cover plate 1 is provided with an annular third protrusion 104, and the periphery of each pole post 2 is surrounded by the third protrusion 104. The lower plastic body 4 is provided with a groove 502 for embedding the third protrusion 104. By embedding the third protrusion 104 into the groove 502, the sealing performance at the mounting hole 103 can be further improved.

[0087] In some exemplary embodiments, the protective portion 5 has a central region 503 corresponding to the electrode post 2 and an edge region 504 surrounding the central region 503; the groove 502 is formed by recessing the central region 503 toward the side away from the lower plastic body 4, and the central region 503 is used to abut against the electrode assembly 3.

[0088] It should be understood that when actually forming the groove 502, the groove 502 can be formed by removing material from the middle region 503. Thus, when the depth of the groove 502 is large, the thickness of the protective part 5 is large, and more material is used during production.

[0089] For ease of understanding, please refer to Figures 7 to 11 As shown, the area in the middle of the protective part 5 corresponding to the pole post 2 will be referred to as the middle region 503, and the edge of the protective part 5 will be referred to as the edge region 504. In this embodiment, there are two middle regions 503 on each protective part 5. The two middle regions 503 are arranged at intervals along the width direction of the cover plate 1, and the edges of the two middle regions 503 are connected together to form an edge region 504.

[0090] In some of these exemplary implementations, refer to Figure 4 , Figures 6 to 11 As shown, each central region 503 is recessed towards the side away from the cover plate 1 to form a groove 502. During manufacturing, the central region 503 and the edge region 504 can have the same thickness; grooves 502 can also be manufactured using materials with smaller thicknesses. This structure is simple, easy to manufacture, and uses less material. When this cover plate assembly is applied to a power battery, the central region 503 can be used to contact the electrode assembly 3 inside the power battery, which helps to dampen the vibration of the electrode assembly 3.

[0091] In some exemplary embodiments, the central region 503 and the edge region 504 are connected by connecting ribs 505, which are a plurality of ribs arranged at intervals around the central region 503.

[0092] Reference Figure 9 and Figure 11 As shown, in some exemplary embodiments, the central region 503 and the edge region 504 are connected by connecting ribs 505. Connecting ribs 505 are provided on both sides of the central region 503. Multiple connecting ribs 505 on each side are arranged at intervals. The interval between adjacent connecting ribs 505 is a through hole 506.

[0093] For example, in an example not shown in the figure, the central region 503 is provided with connecting ribs 505 on both sides along the length of the cover plate 1. There are four connecting ribs 505 on each side, and the four connecting ribs 505 on each side are arranged sequentially at intervals along the width of the cover plate 1.

[0094] The interval between any adjacent connecting ribs 505 on each side can be used for the passage of electrolyte. Along the width direction of the cover plate 1, there are strip-shaped holes on both sides of the central region 503. Each strip-shaped hole extends along the length direction of the cover plate 1, and the length of each strip-shaped hole is greater than the size of the groove 502 in the length direction of the cover plate 1, so that the central region 503 is connected only by the connecting ribs 505 on both sides in the length direction.

[0095] For example Figure 4 and Figure 6 As shown, after the cover assembly is assembled onto the battery casing, the central region 503 and the electrode assembly 3 abut together. Thus, when the electrode assembly 3 shakes, the central region 503 can limit its movement, effectively damping the vibration of the electrode assembly 3. In actual installation, a certain gap between the central region 503 and the electrode assembly 3 is also acceptable.

[0096] In another example, such as Figures 9 to 11 As shown, a plurality of connecting ribs 505 are provided around the central region 503, and the plurality of connecting ribs 505 are arranged at intervals around the central region 503. Specifically, along the length direction of the cover plate 1, the connecting ribs 505 on both sides of the central region 503 are the same as described above. In addition, along the width direction of the cover plate 1, connecting ribs 505 are also provided on both sides of the central region 503, and the connecting ribs 505 on both sides are arranged at intervals along the length direction of the cover plate 1.

[0097] It should be noted that the number of connecting ribs 505 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, six, etc. In the structure above, the central region 503 and the edge region 504 are connected by connecting ribs 505. The interval between adjacent connecting ribs 505 allows the electrolyte to flow through the interval. In addition, this connection method is also beneficial to the vibration of the central region 503, and the amount of material used is also less, which helps to save costs.

[0098] In one example, still refer to Figures 9 to 11 As shown, along the length of the cover plate 1, the middle part of the lower plastic body 4 has a protruding part 405 corresponding to the explosion-proof valve 7. The protruding part 405 protrudes to the side away from the cover plate 1, and a cavity 4051 is formed inside the protruding part 405, which can provide clearance space for the installation of the explosion-proof valve 7.

[0099] Meanwhile, embodiments of this application also include a power battery, including a battery housing and an electrode group 3 disposed within the battery housing. The housing includes a housing body and a cover plate assembly that enclose a receiving cavity. The electrode group 3 consists of two arranged side by side within the mounting cavity. The electrode post 2 consists of two inserted through the cover plate 1. The two electrode posts 2 are respectively connected to the two electrode tabs 301 of each electrode group 3.

[0100] In this embodiment, the material of the lower plastic can refer to existing technology, for example, it can be made of polypropylene (PP). Because polypropylene has excellent electrical insulation and impact resistance, it can not only effectively insulate the cover plate 1 from the pole post 2, but also make the snap-fit ​​operation smoother by utilizing its own excellent elasticity, and can also play a good buffering role against the up-and-down movement of the pole group 3.

[0101] An embodiment of the second aspect of this application provides an electrical device on which the cover assembly of the first aspect of this application is applied to the power battery.

[0102] The electrical device in this embodiment can be, for example, an existing vehicle. By using the power battery with the aforementioned cover assembly through this electrical device, the risk of welding slag falling into the electrode assembly 3 can be reduced, thereby reducing the possibility of internal short circuits in the battery. This helps ensure the normal operation of the electrical device, improves the safety and reliability of the power battery, and enhances the reliability of the electrical device and the user experience.

[0103] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate assembly, characterized in that: Includes a cover plate and a lower plastic part disposed on one side of the cover plate in the thickness direction; The cover plate is long and narrow, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to be welded to the pole lug in the pole group. The lower plastic includes a lower plastic body disposed on one side of the cover plate in the thickness direction, and two protective parts respectively connected to both ends of the lower plastic body along the length direction of the cover plate; The lower plastic body can insulate each of the poles from the cover plate respectively; each of the protective parts is provided with a buckle, and the lower plastic body is provided with a through hole corresponding to the buckle; the protective part can be bent to one side of the lower plastic body and at least block the pole at the corresponding end; the snap-fit ​​part of the buckle can pass through the corresponding through hole and snap-fit ​​with the cover plate. The middle part of each of the protective parts protrudes along the thickness direction of the cover plate toward the side away from the cover plate, thereby forming a groove, the opening of the groove facing the lower plastic body.

2. The cover plate assembly according to claim 1, characterized in that: Each of the protective parts is connected to the lower plastic body through a bending portion, and each of the protective parts, each of the bending portions, and the lower plastic body are integrally formed by injection molding.

3. The cover plate assembly according to claim 2, characterized in that: The lower plastic body is conformally arranged to the cover plate, and the bent portion is located in the middle of the protective portion along the width direction of the cover plate.

4. The cover plate assembly according to claim 2, characterized in that: The bent portion is provided with a rubber-reducing groove; and / or, The bent portion is provided with a through hole.

5. The cover plate assembly according to claim 1, characterized in that: The cover plate is provided with a snap-fit ​​hole, which is a blind hole, and the snap-fit ​​part of the buckle can pass through the through hole and be snapped into the snap-fit ​​hole.

6. The cover plate assembly according to claim 1, characterized in that: The lower plastic body has a first protrusion protruding toward one side of the protective portion, and the through hole is located at the first protrusion and penetrates the lower plastic body.

7. The cover plate assembly according to claim 1, characterized in that: The cover plate is provided with mounting holes for each of the pole posts to pass through, and a sealing ring is provided between each pole post and the cover plate to seal the gap between them; The pole post includes a cylindrical pole post body, and a first protrusion and a second protrusion disposed on the outer periphery of the pole post body; In a direction orthogonal to the axial direction of the pole post body, both the first boss and the second boss protrude outward from the pole post body, and the outer diameter of the first boss and the outer diameter of the second boss are both larger than the diameter of the mounting hole.

8. The cover plate assembly according to claim 7, characterized in that: The mounting holes include a first mounting hole and a second mounting hole that are connected to each other. The diameter of the first mounting hole is smaller than the diameter of the second mounting hole, and the second mounting hole is located on the side of the cover plate facing the lower plastic. The sealing ring is installed at the first mounting hole, and the lower plastic body is provided with a second protrusion that is embedded in the second mounting hole, the second protrusion surrounding the periphery of the pole post.

9. The cover plate assembly according to any one of claims 1-8, characterized in that: Each of the protective portions has a central region corresponding to the pole post, and an edge region surrounding the central region; The groove is formed by recessing the central region toward the side away from the lower plastic body, and the central region is used to press against the electrode assembly.

10. An electrical appliance, characterized in that: The power battery of the electrical equipment is equipped with a cover plate assembly as described in any one of claims 1-9.

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