Cover plate assembly and power battery

Abstract

This utility model relates to the field of power battery technology and provides a cover plate assembly and a power battery. The cover plate assembly of this utility model includes a cover plate integrating terminals, and an insulating component disposed on one side of the cover plate to insulate the cover plate and terminals. The cover plate is elongated and can accommodate an explosion-proof valve. The insulating component includes an insulating main body conforming to the cover plate, and a protective portion connected to the insulating main body in the width direction. The protective portion is snap-fitted to the insulating main body and is positioned on the side of the insulating main body facing away from the cover plate. The protective portion has an opening corresponding to the explosion-proof valve and a groove corresponding to the terminals, with the groove recessed towards the side away from the insulating main body. The cover plate assembly of this utility model can effectively prevent welding slag from the terminals and tabs from piercing the separator, improving the reliability of the explosion-proof valve and enhancing the safety and reliability of the power battery.

Description

Technical Field

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

[0002] In the battery manufacturing process, the welding of the tabs and the cover plate is one of the key processes, and its welding quality directly affects the safety and performance of the battery.

[0003] Specifically, the electrode assembly includes positive and negative electrode plates, as well as a separator that insulates the positive and negative electrode plates. The separator is a crucial component in the battery, separating the positive and negative electrodes. If it is punctured by weld slag formed during the welding of the tabs and the cover plate, the positive and negative electrodes will come into direct contact, creating a short circuit. The high temperature generated by the short circuit may trigger a chain reaction inside the battery, such as electrolyte decomposition and electrode material decomposition, potentially leading to thermal runaway. Thermal runaway can not only damage the battery but also pose a threat to the surrounding environment and personnel safety. Utility Model Content

[0004] In view of this, the present invention aims to provide a cover plate assembly to improve the safety and reliability of power batteries.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A cover plate assembly includes a cover plate, an electrode post passing through the cover plate, and an insulating member disposed on one side of the cover plate and capable of insulating the cover plate and the electrode post; The cover plate is elongated and can be fitted with an explosion-proof valve; The insulating element includes an insulating body conforming to the cover plate, and a protective portion connected to the insulating body in the width direction of the insulating body; The protective portion extends along the length of the insulating body, the protective portion is snapped into the insulating body, and the protective portion is positioned on the side of the insulating body facing away from the cover plate. The protective part is provided with an opening corresponding to the explosion-proof valve and a groove corresponding to the pole, and the groove is recessed towards the side away from the insulating body.

[0006] Furthermore, the protective part is connected to the insulating body through the connecting part, and the protective part, the connecting part, and the insulating body are integrally formed by injection molding.

[0007] Furthermore, the connecting portion is provided with a glue-reducing groove; and / or, the connecting portion is provided with an opening.

[0008] Furthermore, the protective part is connected to the insulating body by a snap-fit ​​structure, and the snap-fit ​​structure includes a buckle on the insulating body and a snap-fit ​​hole on the protective part, wherein the buckle can be snapped into the snap-fit ​​hole.

[0009] Furthermore, a protrusion is provided on one side of the protective part in the thickness direction, and the snap-fit ​​hole is provided at the protrusion and penetrates the protective part; after snapping, the protective part abuts against the insulating body through the protrusion.

[0010] Furthermore, the buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the insulating body, and a snap-fit ​​block protruding radially outward from the connecting block; the buckle is snapped onto the protective part by the snap-fit ​​block.

[0011] Furthermore, the snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected to each other, wherein the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole; the connecting block is inserted into the first snap-fit ​​hole, and the snap-fit ​​block is snapped into the second snap-fit ​​hole.

[0012] Furthermore, the protective portion has a central region corresponding to the pole and an edge region surrounding the central region; the groove is formed by recessing the central region toward the side away from the insulating body.

[0013] Furthermore, the central region and the edge region are connected by connecting ribs, which are multiple ribs arranged at intervals around the central region.

[0014] Compared with the prior art, this utility model has the following advantages: (1) The cover plate assembly described in this application, by making the insulating part include an insulating body and a protective part, and by setting the protective part to block the side of the corresponding electrode tab facing away from the cover plate, when applied to a power battery, can better prevent the welding slag of the electrode post and electrode tab from piercing the separator. The opening of the corresponding explosion-proof valve is provided to improve the reliability of the explosion-proof valve. The groove provided can provide sufficient space to cover the welding parts of the electrode post and electrode tab, which can further prevent the separator from being pierced, further reduce the risk of piercing the separator, and improve the safety and reliability of the power battery.

[0015] Each protective component is snap-fitted to the insulating body, 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, once the protective component is aligned with the insulating body, assembly is completed with a gentle push or press, significantly improving production efficiency. 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, it requires minimal skill from operators, eliminating the need for companies 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 insulating body through the connecting part, so that the protective part can be bent relative to the insulating body through the connecting part, and it is easy to ensure the fit between the protective part and the insulating body. The protective part, the connecting part and the insulating body are integrally formed by injection molding, which is convenient to process. This integrated insulating part is also convenient to assemble and use, which can reduce the number of parts and facilitate management. At the same time, the insulating part processed by injection molding has good insulation and protection performance, and is not easily punctured by the welding slag of the pole and the pole ear, thus reducing the risk of welding slag puncturing the diaphragm.

[0017] (3) Setting a rubber reduction groove on the connecting part and setting an opening on the connecting part are both convenient to process and facilitate the smooth bending of the bending part.

[0018] (4) The buckle is placed on the insulating body and the protective part is provided with a snap-fit ​​hole. When the buckle is placed in the snap-fit ​​hole, the two will form a tight fit. A reasonable buckle and snap-fit ​​hole design can provide sufficient friction and mechanical locking force to ensure that the insulating body and the protective part will not easily separate when subjected to normal external force.

[0019] (5) By setting a protrusion on the protective part and setting the snap-fit ​​hole on the protrusion and penetrating the protective part, the thickness of the snap-fit ​​hole can be increased. When the insulating body and the protective part are snapped together, such a structure can improve the stability and reliability of the connection between the two.

[0020] (6) The buckle includes multiple sub-buckles, each of which includes a snap-fit ​​block and a connecting block. Multiple snap-fit ​​blocks together form the snap-fit ​​part, and multiple connecting blocks together form the connecting part. When the buckle is snapped into the snap-fit ​​hole, multiple snap-fit ​​blocks shift together toward the center line of the buckle, so that the snap-fit ​​hole can be smoothly snapped into the snap-fit ​​hole. The snap-fit ​​process is convenient. After the snap-fit ​​is completed, each snap-fit ​​block resets under the action of its respective connecting block, so that the buckle can be firmly snapped into the snap-fit ​​hole. The reliability and stability of the snap-fit ​​are high.

[0021] (7) The buckle includes a snap-fit ​​part and a connecting part, and the snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole with different diameters. The connecting part is embedded in the first snap-fit ​​hole, and the snap-fit ​​part is snapped in the second snap-fit ​​hole, so that the buckle can be firmly fixed in the snap-fit ​​hole, which helps to improve the reliability of the snap-fit ​​connection between the insulating body and the protective part.

[0022] (8) The middle area is recessed towards the side away from the cover plate to form a groove. The structure is simple, easy to process, and uses less material. When this electrode assembly is applied to the power battery, the middle area 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.

[0023] (9) The central area and the edge are connected by connecting ribs, and the adjacent connecting ribs form a gap, which allows the electrolyte to flow through the gap. In addition, this connection method is also conducive to the vibration of the central area, and the amount of material used is also less, which helps to save costs.

[0024] Another objective of this utility model is to provide a power battery, wherein the casing of the power battery is provided with a cover plate assembly as described above.

[0025] Compared with the prior art, this utility model has the following advantages: The power battery described in this utility model, by applying the above-mentioned cover plate assembly, has the same beneficial effects as the aforementioned cover plate assembly relative to the prior art, and will not be described again. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is an exemplary structural diagram of the cover plate assembly in an application state according to an embodiment of the present utility model; Figure 2 for Figure 1 A structural diagram from another perspective; Figure 3 For along Figure 2 Sectional view of line II in the middle; Figure 4 for Figure 3 Enlarged view of part D; Figure 5 This is an exemplary structural diagram illustrating the assembly process of the cover plate assembly and the pole group according to an embodiment of the present utility model; Figure 6 This is an exemplary structural diagram of the cover plate assembly described in an embodiment of the present utility model; Figure 7 for Figure 6 A structural diagram from another perspective; Figure 8 For along Figure 7 Sectional view of line AA in the middle; Figure 9 for Figure 8 Enlarged view of part E; Figure 10 For along Figure 7 Sectional view of the middle BB line; Figure 11 for Figure 10 Enlarged view of part F; Figure 12 For along Figure 7 A cross-sectional view of the CC line; Figure 13 for Figure 12 Enlarged view of part G; Figure 14 This is another exemplary structural schematic diagram of the cover plate assembly described in this utility model embodiment; Figure 15 for Figure 14 A structural diagram from another perspective.

[0027] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Insulating component; 3. Electrode assembly; 101. Pole column; 201. Insulating main body; 202. Protective part; 203. Connecting part; 2011, Buckle; 2012, First mounting hole; 2013, Second mounting hole; 20111, Snap-on; 20112, Snap-on Block; 20113, Connecting Block; 2021. Central area; 2022. Edge area; 2023. Groove; 2024. Snap-fit ​​hole; 2025. Connecting rib; 2026. Through hole; 2027. Opening; 2028. Protrusion; 20241, First card slot; 20242, Second card slot; 2031, Glue Reduction Groove; 301. Extreme Ear. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, 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.

[0030] Furthermore, in the description of this utility model, unless otherwise explicitly 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Within the battery manufacturing process, the welding process between the tabs and the cover plate occupies a crucial and pivotal position, being one of the core steps determining the final quality of the battery. The welding quality of this process is closely and directly related to the battery's safety and electrochemical performance, and its quality plays a decisive role in whether the battery can operate stably and safely under complex and changing usage environments.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 nearby personnel. This embodiment relates to a cover plate assembly. In order to effectively prevent welding slag on cover plate 1 from puncturing the diaphragm, this embodiment relates to a cover plate assembly, which improves the safety and reliability of power battery applications by improving the structure of the insulating component 2 on cover plate 1.

[0039] To better understand the cover plate assembly of this embodiment, the structure of the power battery will be briefly described first, referring to... Figures 1 to 5As shown, a power battery generally 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. A 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.

[0040] An exemplary structure of the cover plate assembly in this embodiment is as follows: Figures 6 to 7 As shown, the cover plate assembly includes a cover plate 1, a pole post 101 passing through the cover plate 1, and an insulating member 2 disposed on one side of the cover plate 1 and capable of insulating the cover plate 1 and the pole post 101.

[0041] In terms of specific structure, the cover plate 1 is elongated and can be equipped with an explosion-proof valve; the insulating component 2 includes an insulating body 201 that conforms to the shape of the cover plate 1, and a protective part 202 that is connected to the insulating body 201 in the width direction of the insulating body 201.

[0042] In a preferred embodiment, the protective part 202 extends along the length of the insulating body 201. The protective part 202 is snapped into the insulating body 201 and is positioned on the side of the insulating body 201 facing away from the cover plate 1. The protective part 202 is provided with an opening 2027 corresponding to the explosion-proof valve and a groove 2023 corresponding to the pole post 101. The groove 2023 is recessed towards the side away from the insulating body 201.

[0043] like Figure 6 and Figure 7 As shown, in one exemplary embodiment, the protective portion 202 is provided with two grooves 2023, which correspond one-to-one with the pole post 101 on the cover plate 1, and each groove 2023 is recessed toward the side away from the cover plate 11.

[0044] It should be noted that, since welding slag is easily generated at the welding points of the terminal post 101 and the tab 301, the cover plate assembly described in this application, by having the insulating component 2 include an insulating body 201 and a protective portion 202, and by having the protective portion 202 block the side of the corresponding tab 301 facing away from the cover plate 1, this structure, when applied to a power battery, can effectively prevent the welding slag of the terminal post 101 and the tab 301 from piercing the separator. The opening 2027 corresponding to the explosion-proof valve is provided to improve the reliability of the explosion-proof valve. The groove 2023 provides sufficient space to cover the welding points of the terminal post 101 and the tab 301, which can further prevent piercing the separator and further reduce the risk of piercing the separator, thereby improving the safety and reliability of the power battery.

[0045] In one exemplary embodiment, the number of openings 2027 corresponding to the explosion-proof valve is four, and they are elliptical holes. It should be understood that the number of openings 2027 corresponding to the explosion-proof valve can also be other values, such as one, three, five, etc., and the shape of the openings 2027 can also be other shapes, such as circles, squares, triangles, etc.

[0046] Each protective component 202 is snap-fitted to the insulating body 201, 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, once the protective component 202 is aligned with the insulating body 201, assembly is completed with a gentle push or press, significantly improving production efficiency. Similarly, when disassembly, repair, or replacement of the protective component 202 is required, simply applying a certain amount of external force to release the snap-fit ​​connection 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 personnel allocation and reduces labor costs. Furthermore, the rapid assembly and disassembly process shortens the production cycle, increases equipment utilization, and further reduces production costs.

[0047] It should be noted that the pole post 101 and the cover plate 1 are insulated from each other. The specific structure of the pole post 101 and the installation method of the pole post 101 on the cover plate 1 shall refer to the existing structure. The structure of the insulating body 201 can refer to the existing lower plastic structure, which is used to insulate the pole post 101 and the cover plate 1, and the connection method between the insulating body 201 and the cover plate 1 shall still refer to the existing technology.

[0048] Specifically, generally, there are two pole posts 101 on the cover plate 1, and the pole tabs 301 on the pole group 3 are welded to the corresponding pole posts 101. Therefore, two grooves 2023 need to be provided. For example Figure 6 , Figure 7 , Figure 14 and Figure 15 As shown, the insulating body 201 is connected to the cover plate 1, and the shape of the insulating body 201 is roughly the same as that of the cover plate 1. The aforementioned pole post 101 is installed on the insulating body 201.

[0049] To improve ease of assembly and disassembly, as a preferred implementation, each protective component 202 is snap-fitted to the insulating body 201. This is a quick connection method that, compared to traditional threaded connections or welding, requires no complicated tools or procedures. Using the snap-fit ​​method, once the protective component 202 and the insulating body 201 are aligned, assembly can be completed with a gentle push or press, significantly improving production efficiency.

[0050] When it is necessary to disassemble, repair, or replace the protective part 202, simply applying a certain amount of external force to release the snap-fit ​​connection allows the protective part 202 to be easily removed, which is convenient and quick. Because the snap-fit ​​operation is simple and easy to learn, it requires minimal skill from operators, eliminating the need for companies to invest significant time and resources in professional training for their employees. This allows companies to allocate production personnel more flexibly, reducing labor costs. Simultaneously, the rapid assembly and disassembly process shortens the production cycle, increases equipment utilization, and further reduces production costs.

[0051] In some exemplary embodiments, the protective portion 202 is connected to the insulating body 201 via the connecting portion 203, so that the protective portion 202 can be bent relative to the insulating body 201 via the connecting portion 203, and the fit between the protective portion 202 and the insulating body 201 can be easily ensured. Furthermore, the protective portion 202 after being bent relative to the insulating body 201 is snapped into place with the insulating body 201.

[0052] To better understand the assembly process of the cover plate assembly in this embodiment, for example... Figure 5 As shown, the tab 301 of the electrode group 3 is welded to the pole post 101, and the insulating body 201 is connected to the cover plate 1. This is a schematic diagram of the structure of the protective part 202 before bending. And as... Figure 2 and Figure 3 The diagram shown is a structural schematic of the protective part 202 being bent to one side of the insulating body 201 and blocking the opposite side of the corresponding tab 301 facing the cover plate 1.

[0053] like Figure 6 and Figure 7 As shown, in a preferred embodiment, the protective portion 202 is connected to the insulating body 201 via a connecting portion 203. The size of the connecting portion 203 is smaller than the size of the protective portion 202 along the length of the cover plate 1. For example, in one embodiment, there are two connecting portions 203, each extending along the length of the cover plate 1, and the two connecting portions 203 are spaced apart along the length of the cover plate 1.

[0054] In addition, each protective part 202 is connected to the insulating body 201 through the connecting part 203, and the dimension of the connecting part 203 in the length direction of the cover plate 1 is limited to the dimension of the protective part 202. On the one hand, this facilitates the smooth bending of the protective part 202 relative to the insulating body 201. On the other hand, the dimension of the connecting part 203 in the length direction of the cover plate 1 can also save material usage to a certain extent, which further helps to save costs.

[0055] In one exemplary implementation, reference is made to Figure 6 and Figure 7As shown, the insulating body 201 is provided with a first mounting hole 2012 and a second mounting hole 2013. There is one first mounting hole 2012, which is located in the middle of the insulating body 201. There are two second mounting holes 2013, which are located on both sides of the first mounting hole 2012. The cover plate 1 is provided with through holes 2026 that are respectively connected to the first mounting hole 2012 and the second mounting hole 2013. The first mounting hole 2012 is used to install an explosion-proof valve, and each of the second mounting holes 2013 is used to install an electrode post 101.

[0056] In some exemplary embodiments, the protective part 202, the connecting part 203, and the insulating body 201 are integrally molded by injection molding. This process is convenient, and the integrated insulating part 2 is easy to assemble and use in application. It can reduce the number of parts and facilitate management. At the same time, the insulating part 2 processed by injection molding not only has good insulation and protection performance, but is also not easily punctured by the weld slag of the pole post 101 and the pole lug 301, thereby reducing the risk of weld slag puncturing the diaphragm.

[0057] In some exemplary embodiments, the connecting portion 203 is provided with a glue-reducing groove 2031, such as... Figure 14 and Figure 15 As shown, the connecting portion 203 extends along the length of the cover plate 1, and the adhesive reduction groove 2031 is provided on one side of the connecting portion 203 and extends along the extending direction of the connecting portion 203, which facilitates the smooth bending of the bending portion. It should be understood that, in addition, adhesive reduction grooves 2031 can be provided on both sides of the connecting portion 203, or the adhesive reduction grooves 2031 can be omitted. Here, the adhesive reduction groove 2031 provided on the connecting portion 203 is easy to process and facilitates the smooth bending of the bending portion.

[0058] In some exemplary embodiments, the connecting portion 203 is provided with an opening 2027. Here, the opening 2027 provided on the connecting portion 203 is easy to process and facilitates smooth bending of the bending portion.

[0059] In some exemplary embodiments, the protective part 202 and the insulating body 201 are connected by a snap-fit ​​structure, and the snap-fit ​​structure includes a buckle 2011 provided on the insulating body 201 and a snap-fit ​​hole 2024 provided on the protective part 202. The buckle 2011 can be snapped into the snap-fit ​​hole 2024, so that the insulating body 201 and the protective part 202 are snap-fit ​​connected.

[0060] For example, in this embodiment, the protective part 202 is provided with four snap-fit ​​holes 2024, and the buckles 2011 provided on the insulating body 201 correspond one-to-one with the snap-fit ​​holes 2024. When the protective part 202 is bent to one side of the insulating body 201, the corresponding buckles 2011 and snap-fit ​​holes 2024 snap together. For ease of description, a set of buckles 2011 and snap-fit ​​holes 2024 snapped together is referred to as a set of snap-fit ​​structures.

[0061] In a preferred embodiment, for example Figure 6 and Figure 7 As shown, four snap-fit ​​holes 2024 are arranged near the end of the protective part 202 away from the insulating body 201, and are spaced apart along the length of the cover plate 1 body. This facilitates the secure snap-fit ​​of the protective part 202 to one side of the insulating body 201, and also helps to ensure the fit between the protective part 202 and the insulating body 201 after snap-fitting.

[0062] It should be understood that the number of snap-fit ​​structures between each protective part 202 and the insulating body 201 can be four, or other numbers, such as one, three, two, or five sets. Furthermore, the snap-fit ​​structures can also be arranged in other locations, such as... Figure 6 As shown, the snap-fit ​​structure is arranged close to the insulating body 201.

[0063] A snap-fit ​​2011 is provided on the insulating body 201, and a snap-fit ​​hole 2024 is provided on the protective part 202. When the snap-fit ​​2011 is engaged in the snap-fit ​​hole 2024, a tight fit is formed between the two. The reasonable design of the snap-fit ​​2011 and the snap-fit ​​hole 2024 can provide sufficient friction and mechanical locking force to ensure that the insulating body 201 and the protective part 202 will not easily separate under normal external force.

[0064] To improve the reliability of the card connection, such as Figure 6 and Figure 15 As shown, in some exemplary embodiments, the protective portion 202 has a protrusion 2028 on one side in the thickness direction. Specifically, the bent protective portion 202 has a protrusion 2028 protruding towards the insulating body 201 along its own thickness direction. The snap-fit ​​hole 2024 is provided at the protrusion 2028 and penetrates the protective portion 202. The snap-fit ​​protective portion 202 abuts against the insulating body 201 through the protrusion 2028.

[0065] By providing a protrusion 2028 on the protective part 202 and setting a snap-fit ​​hole 2024 on the protrusion 2028 and passing through the protective part 202, the thickness of the snap-fit ​​hole 2024 can be increased. When the insulating body 201 and the protective part 202 are snapped together, this structure can improve the stability and reliability of the connection between the two.

[0066] Reference Figure 14 and Figure 15 As shown, in order to improve the snap-fit ​​effect, in a preferred embodiment, the snap fastener 2011 includes a snap-fit ​​part and a connecting part that connects the snap-fit ​​part to the insulating body 201. The snap-fit ​​hole 2024 includes a first snap-fit ​​hole 20241 and a second snap-fit ​​hole 20242 that are connected to each other. The diameter of the first snap-fit ​​hole 20241 is smaller than the diameter of the second snap-fit ​​hole 20242. The connecting part is embedded in the first snap-fit ​​hole 20241, and the snap-fit ​​part is snapped into the second snap-fit ​​hole 20242.

[0067] The buckle 2011 includes a snap-fit ​​part and a connecting part, while the snap-fit ​​hole 2024 includes a first snap-fit ​​hole 20241 and a second snap-fit ​​hole 20242 with different diameters. The connecting part is embedded in the first snap-fit ​​hole 20241, and the snap-fit ​​part is snapped in the second snap-fit ​​hole 20242, so that the buckle 2011 can be firmly fixed in the snap-fit ​​hole 2024, which helps to improve the reliability of the snap-fit ​​connection between the insulating body 201 and the protective part 202.

[0068] In some exemplary embodiments, the snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap-fit ​​hole 2024. Each sub-snap fastener 20111 has a connecting block 20113 connected to the insulating body 201, and a snap-fit ​​block 20112 protruding radially outward from the connecting block 20113. The snap fastener 2011 is snapped onto the protective part 202 by the snap-fit ​​block 20112. Each connecting block 20113 together constitutes the aforementioned connecting part, and each snap-fit ​​block 20112 together constitutes the aforementioned snap-fit ​​part.

[0069] The buckle 2011 includes multiple sub-buckles 20111, each of which includes a snap-fit ​​block 20112 and a connecting block 20113. The multiple snap-fit ​​blocks 20112 together form a snap-fit ​​part, and the multiple connecting blocks 20113 together form a connecting part. When the buckle 2011 is snapped into the snap-fit ​​hole 2024, the multiple snap-fit ​​blocks 20112 are offset together towards the center line of the buckle 2011, so that the snap-fit ​​hole 2024 can be smoothly snapped into the snap-fit ​​hole 2024. The snap-fit ​​process is convenient, and after the snap-fit ​​is completed, each snap-fit ​​block 20112 is reset under the action of its respective connecting block 20113, so that the buckle 2011 can be firmly snapped into the snap-fit ​​hole 2024. The reliability and stability of the snap-fit ​​are high.

[0070] In some of the exemplary implementations, such as Figure 7 , Figure 12 and Figure 13As shown, the snap-fit ​​hole includes a first snap-fit ​​hole 20241 and a second snap-fit ​​hole 20242 that are connected to each other. The diameter of the first snap-fit ​​hole 20241 is smaller than the diameter of the second snap-fit ​​hole 20242. The connecting block 20113 is inserted into the first snap-fit ​​hole 20241, and the snap-fit ​​block 20112 is snapped into the second snap-fit ​​hole 20242.

[0071] For example, in one embodiment, the cross-sections of both the first snap-fit ​​hole 20241 and the second snap-fit ​​hole 20242 are circular, as are the cross-sections of the connecting portion and the snap-fit ​​portion. In the above structure, the buckle 2011 includes both a snap-fit ​​portion and a connecting portion, while the snap-fit ​​hole 2024 includes the first snap-fit ​​hole 20241 and the second snap-fit ​​hole 20242 with different diameters. The connecting portion is inserted into the first snap-fit ​​hole 20241, and the snap-fit ​​portion is snapped into the second snap-fit ​​hole 20242, allowing the buckle 2011 to be securely fixed in the snap-fit ​​hole 2024, thus improving the reliability of the snap-fit ​​connection between the insulating body 201 and the protective portion 202.

[0072] It should be noted that when the snap fastener 2011 is engaged in the snap-fit ​​hole 2024, the center line of the snap fastener 2011 is collinear with the axial center line of the snap-fit ​​hole 2024. In some examples, there are four snap fasteners 20111, and the cross-section of the snap-fit ​​portion of each snap fastener 20111 is a sector with a central angle of 90°, and the cross-section of the connecting portion of each snap fastener 20111 is also a sector with a central angle of 90°.

[0073] It is worth mentioning that, in order to facilitate the snap fastener 2011 being snapped into the snap-fit ​​hole 2024, in a preferred embodiment, the end of the snap-fit ​​part that is first inserted into the snap-fit ​​hole 2024 is provided with a guide part, which is used to guide the snap fastener 2011 to be snapped into the snap-fit ​​hole 2024.

[0074] In specific implementation, the guide portion can be a chamfered edge on the edge of the snap-fit ​​portion to facilitate the smooth insertion of the snap-fit ​​2011 into the snap-fit ​​hole 2024. For example, in this embodiment, the edge of each snap-fit ​​2011 away from the insulating body 201 is chamfered to improve the speed at which the snap-fit ​​2011 is snapped into place.

[0075] Here, the buckle 2011 includes multiple sub-buckles 20111, each sub-buckle 20111 including a snap-fit ​​block 20112 and a connecting block 20113. The multiple snap-fit ​​blocks 20112 together constitute the snap-fit ​​part, and the multiple connecting blocks 20113 together constitute the connecting part. When the buckle 2011 is snapped into the snap-fit ​​hole 2024, the multiple snap-fit ​​blocks 20112 are offset together towards the center line of the buckle 2011, so that the snap-fit ​​hole 2024 can be smoothly snapped into the snap-fit ​​hole 2024. The snap-fit ​​process is convenient, and after the snap-fit ​​is completed, each snap-fit ​​block 20112 is reset under the action of its respective connecting block 20113, so that the buckle 2011 can be firmly snapped into the snap-fit ​​hole 2024. The reliability and stability of the snap-fit ​​are high.

[0076] In some exemplary embodiments, the protective portion 202 has a central region 2021 corresponding to the pole post 101 and an edge region 2022 surrounding the central region 2021; the groove 2023 is formed by recessing the central region 2021 toward the side away from the insulating body 201.

[0077] It should be understood that when actually forming the groove 2023, the groove 2023 can be formed by removing material from the middle region 2021. Thus, when the depth of the groove 2023 is large, the thickness of the protective part 202 is large, and more material is used during production.

[0078] For ease of understanding, please refer to Figures 6 to 13 As shown, the area in the middle of the protective part 202 corresponding to the pole post 101 is referred to as the middle region 2021, and the edge of the protective part 202 is referred to as the edge region 2022. In this embodiment, there are two middle regions 2021, which are arranged at intervals along the length of the cover plate 1.

[0079] As a preferred implementation method, refer to Figure 6 , Figure 7 , Figure 14 and Figure 15 As shown, each central region 2021 is recessed towards the side away from the cover plate 1 to form a groove 2023. During manufacturing, the central region 2021 and the edge region 2022 can have the same thickness; the groove 2023 can also be manufactured using a material with a smaller thickness. 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 2021 can be used to contact the electrode assembly 3 inside the power battery, which helps to dampen the vibration of the electrode assembly 3.

[0080] In some exemplary embodiments, the central region 2021 and the edge region 2022 are connected by connecting ribs 2025, which are a plurality of ribs arranged at intervals around the central region 2021.

[0081] Reference Figure 6 , Figure 7 , Figure 14 and Figure 15 As shown, in a preferred embodiment, the central region 2021 and the edge region 2022 are connected by connecting ribs 2025. Connecting ribs 2025 are provided on both sides of the central region 2021, and multiple connecting ribs 2025 on each side are arranged at intervals.

[0082] For example Figure 6 In the example shown, the central region 2021 is provided with connecting ribs 2025 on both sides along the length of the cover plate 1. There are four connecting ribs 2025 on each side, and the four connecting ribs 2025 on each side are arranged at intervals along the width of the cover plate 1.

[0083] The interval between any adjacent connecting ribs 2025 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 2021. 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 2023 in the length direction of the cover plate 1, so that the central region 2021 is connected only by the connecting ribs 2025 on both sides in the length direction.

[0084] For example Figure 4 As shown, after the cover plate assembly is assembled onto the battery casing, the central region 2021 and the electrode group 3 abut together. Thus, when the electrode group 3 shakes, the central region 2021 can limit the movement of the electrode group 3, effectively damping its vibration. In actual arrangement, a certain gap between the central region 2021 and the electrode group 3 is also acceptable.

[0085] Still refer to Figure 14 As shown, in another example, the central region 2021 is surrounded by multiple connecting ribs 2025, which are arranged at intervals around the central region 2021. Specifically, along the length of the cover plate 1, the connecting ribs 2025 on both sides of the central region 2021 are consistent with those described above. In addition, along the width of the cover plate 1, the central region 2021 is also provided with connecting ribs 2025 on both sides, and the connecting ribs 2025 on both sides are arranged at intervals along the length of the cover plate 1.

[0086] It should be noted that the number of connecting ribs 2025 on each side can be arranged according to actual needs, and is not limited to the four shown in the figure. For example, it can be one, three, six, etc. In the structure above, the central region 2021 and the edge region 2022 are connected by connecting ribs 2025. The interval between adjacent connecting ribs 2025 allows the electrolyte to flow through the interval. In addition, this connection method is also beneficial to the vibration of the central region 2021, and the amount of material used is also less, which helps to save costs.

[0087] Finally, it should be noted that the material of the insulating component 2 can refer to the existing materials of plastics, such as 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 101, but also utilize its excellent elasticity to improve the damping effect of the central region 2021 on the vibration of the pole group 3.

[0088] The cover plate assembly of this embodiment, by making the insulating part 2 include an insulating body 201 and a protective part 202, and connecting the insulating body 201 and the protective part 202, and blocking the side of the corresponding tab 301 facing away from the cover plate 1, can effectively prevent the welding slag formed by welding the tab 301 and the cover plate 1 from piercing the separator in the electrode group 3. When applied to power batteries, it can improve the safety and reliability of power batteries.

[0089] In addition, this application also relates to a power battery having a cover assembly as described above.

[0090] This embodiment also relates to an electrical device, wherein the power battery of the electrical device is provided with the above-described cover assembly. The electrical device may be, for example, an existing vehicle.

[0091] In this embodiment, by applying the aforementioned cover plate assembly to the power battery, the safety and reliability of the power battery can be improved, thereby improving the safety and reliability of the electrical equipment.

[0092] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cover plate assembly, characterized in that: It includes a cover plate, an electrode post passing through the cover plate, and an insulating member disposed on one side of the cover plate and capable of insulating the cover plate and the electrode post; The cover plate is elongated and can be fitted with an explosion-proof valve; The insulating element includes an insulating body conforming to the cover plate, and a protective portion connected to the insulating body in the width direction of the insulating body; The protective portion extends along the length of the insulating body, the protective portion is snapped into the insulating body, and the protective portion is positioned on the side of the insulating body facing away from the cover plate. The protective part is provided with an opening corresponding to the explosion-proof valve and a groove corresponding to the pole, and the groove is recessed towards the side away from the insulating body.

2. The cover plate assembly according to claim 1, characterized in that: The protective part is connected to the insulating body through a connecting part, and the protective part, the connecting part, and the insulating body are integrally formed by injection molding.

3. The cover plate assembly according to claim 2, characterized in that: The connecting portion is provided with a glue-reducing groove; and / or, The connecting part has an opening.

4. The cover plate assembly according to claim 1, characterized in that: The protective part is connected to the insulating body by a snap-fit ​​structure, and the snap-fit ​​structure includes a buckle on the insulating body and a snap-fit ​​hole on the protective part, wherein the buckle can be snapped into the snap-fit ​​hole.

5. The cover plate assembly according to claim 4, characterized in that: The protective part has a protrusion on one side in the thickness direction, and the snap-fit ​​hole is located at the protrusion and penetrates the protective part; After being snapped in, the protective portion abuts against the insulating body via the protrusion.

6. The cover plate assembly according to claim 4, characterized in that: The buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the insulating body, and a snap-fit ​​block protruding radially outward from the connecting block. The buckle is secured to the protective part by the snap-fit ​​block.

7. The cover plate assembly according to claim 6, characterized in that: The snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected to each other, wherein the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole; The connecting block is inserted into the first snap-fit ​​hole, and the snap-fit ​​block is snapped into the second snap-fit ​​hole.

8. The cover plate assembly according to any one of claims 1-7, characterized in that: The protective portion 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 insulating body.

9. The cover plate assembly according to claim 8, characterized in that: The central region and the edge region are connected by connecting ribs, which are multiple ribs arranged at intervals around the central region.

10. A power battery, characterized in that: The casing of the power battery is provided with a cover plate assembly as described in any one of claims 1-9.

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