Cover plate assembly and vehicle

Abstract

The utility model relates to power battery technical field and provide a kind of cover plate assembly and vehicle, the cover plate assembly of the utility model includes strip-shaped cover plate, and the insulating protective structure being located on cover plate, insulating protective structure includes the structure body being attached to the one side of cover plate, and the protective part being located at the one side of structure body along the width direction of cover plate, protective part and the tab welded on cover plate one-one correspondence, each protective part is bent relative to structure body, can be connected with structure body, and cover the side of corresponding tab away from cover plate, each protective part is equipped with cavity, and each cavity is recessed towards the side away from cover plate.The cover plate assembly of the utility model can effectively prevent the slag formed by tab and cover plate welding from piercing the diaphragm in pole group, applied to power battery, and can improve the safety and reliability of power battery.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a cover assembly for sealing openings in battery casings. This utility model also relates to a vehicle using this cover 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 separator is a crucial component in a battery that isolates 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 assembly for sealing openings in a battery casing: It includes a long strip-shaped cover plate and an insulating protective structure disposed on the cover plate; The insulating protective structure includes a structural body attached to one side of the cover plate, and a protective portion located on one side of the structural body along the width direction of the cover plate; The protective part corresponds one-to-one with the tabs welded to the pole post of the cover plate. The protective parts corresponding to each tab are arranged at intervals. Each protective part is bent relative to the structural body and can be connected to the structural body, while covering the side of the corresponding tab facing away from the cover plate. Each of the protective parts is provided with a cavity, and each cavity is recessed toward the side away from the cover plate.

[0006] Furthermore, each of the protective components is snapped into and connected to the main structure.

[0007] Furthermore, the main body of the structure is provided with a buckle, and the protective part is provided with a locking hole. The buckle is placed in the locking hole, so that the main body of the structure and the protective part can be locked together.

[0008] Furthermore, the buckle includes a snap-fit ​​portion and a connecting portion for connecting the snap-fit ​​portion to the structural body; The card slot includes a first card slot and a second card slot that are connected to each other. The diameter of the first card slot is smaller than the diameter of the second card slot. The connecting part is embedded in the first card slot, and the snap-fit ​​part is snap-fitted in the second card slot.

[0009] Furthermore, the buckle includes multiple sub-buckles, which are spaced apart around the center line of the buckle; Furthermore, each of the aforementioned snap fasteners includes a snap fastening portion that is snapped into the second snap hole, and a snap connecting portion that connects the snap fastening portion to the structural body; The multiple sub-connecting parts together constitute the connecting part, and the multiple sub-connecting parts together constitute the connecting part.

[0010] Furthermore, the middle portion of each of the protective parts is recessed towards the side away from the cover plate to form the cavity.

[0011] Furthermore, the middle part and the edge of the protective section are connected by connecting ribs; The protective part has connecting ribs on both sides of the middle section, and the connecting ribs on each side are arranged in a plurality of sequentially spaced intervals; and / or, the protective part has a plurality of connecting ribs arranged circumferentially around the middle section, and the plurality of connecting ribs are arranged at intervals around the middle section of the protective part.

[0012] Furthermore, each of the protective components is connected to the structural body via a bent portion, and the size of the bent portion is smaller than the size of the protective component in the length direction of the cover plate.

[0013] Furthermore, at least one side of the bent portion is provided with a glue-reducing groove, which extends along the extension direction of the bent portion.

[0014] Compared with the prior art, this utility model has the following advantages: The cover plate assembly described in this utility model, by comprising a structural body and a protective portion of an insulating protective structure, and connecting the structural body and the protective portion to cover the side of the corresponding electrode tab facing away from the cover plate, can effectively prevent weld slag formed by welding the electrode tab to the cover plate from puncturing the separator in the electrode assembly. When applied to power batteries, it can improve the safety and reliability of the power battery. The designed cavity can better accommodate weld slag at the electrode tab welding site, thereby further reducing the risk of puncturing the separator and improving the performance of the power battery.

[0015] Each protective component is snap-fitted to the main structure, 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 main structure, assembly is completed with a simple push or press, 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, 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] The buckle is attached to the structural body, and locking holes are provided in the protective part. When the buckle is engaged in the locking hole, a tight fit is formed between the two. A well-designed buckle and locking hole can provide sufficient friction and mechanical locking force to ensure that the structural body and the protective part will not easily separate under normal external forces.

[0017] The buckle includes a snap-fit ​​part and a connecting part, while 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 structural body and the protective part.

[0018] The buckle comprises multiple sub-buckles, each including a sub-buckle engagement part and a sub-connecting part. The multiple sub-buckle engagement parts together constitute the engagement part, and the multiple sub-connecting parts together constitute the connecting part. When the buckle is engaged in the buckle hole, the multiple sub-buckle engagement parts shift together towards the center line of the buckle, allowing the buckle to be easily engaged in the buckle hole. The engagement process is convenient, and after engagement is completed, each sub-buckle engagement part resets under the action of its respective sub-connecting part, allowing the buckle to be firmly engaged in the buckle hole. The engagement has high reliability and stability.

[0019] The protective part is recessed in the middle 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 middle part of the protective part can limit the electrode assembly inside the power battery, which can help dampen the vibration of the electrode assembly.

[0020] The middle and edge of the protective section are connected by connecting ribs, and a gap is set between adjacent connecting ribs to allow the electrolyte to flow through the gap. In addition, this connection method is also beneficial to the vibration of the middle of the protective section, and the amount of material used is also less, which helps to save costs.

[0021] Each protective component is connected to the main structure via a bending section, and the dimension of the bending section in the length direction of the cover plate is limited to that of the protective component. This facilitates the smooth bending of the protective component relative to the main structure, and the smaller dimension of the bending section in the length direction of the cover plate also saves material to a certain extent, thereby further contributing to cost savings.

[0022] A rubber-reducing groove is provided on the bent portion, and the rubber-reducing groove extends along the extension direction of the bent portion, which facilitates the smooth bending of the bent portion.

[0023] Another objective of this invention is to provide a vehicle in which the power battery is provided with the cover assembly described above.

[0024] The vehicle described in this utility model has the same beneficial effects as the aforementioned cover plate assembly compared to the prior art, and will not be repeated here. Attached Figure Description

[0025] 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 Top view; Figure 3 For along Figure 2 Sectional view of line AA in the middle; Figure 4 for Figure 3 Enlarged view of part D; Figure 5 For along Figure 2 Sectional view of the middle BB line; Figure 6 for Figure 5 Enlarged view of part E; Figure 7 For along Figure 2 A cross-sectional view of the CC line; Figure 8 for Figure 7 Enlarged view of part F; Figure 9 This is an exemplary structural diagram of the cover plate assembly and pole group assembly described in this utility model embodiment; Figure 10 for Figure 8 A schematic diagram of the structure in which the central protective section is bent to one side of the main structure; Figure 11This is an exemplary structural diagram of the insulating protection structure described in an embodiment of the present utility model; Figure 12 for Figure 11 A structural diagram from another perspective; Figure 13 for Figure 12 Enlarged view of part G; Figure 14 This is another exemplary structural diagram of the insulating protection structure described in the embodiment of this utility model; Figure 15 for Figure 11 Enlarged view of part I.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Insulating protective structure; 3. Electrode group; 101. Pole column; 201. Main structure; 202. Protective components; 203. Bending components; 2011, Buckle; 2012, First mounting hole; 2013, Second mounting hole; 20111, Separate snap fastener; 20112, Separate snap-fit ​​part; 20113, Separate connecting part; 2021. Middle part of the protective section; 2022. Edge of the protective section; 2023. Cavity; 2024. Clip hole; 2025. Connecting rib; 2026. Through hole; 20241, First card slot; 20242, Second card slot; 2031, Glue Reduction Groove; 301. Electrode; a. Centerline. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0028] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[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] In the description of this utility model, ... Figure 2 The diagram illustrates the situation. Figure 2 The left and right directions shown are the length directions of the cover plate assembly. Figure 2 The width direction shown is the width direction of the cover plate assembly.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Example 1 The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In order to effectively prevent welding slag on the 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 protection structure 2 on the cover plate 1.

[0042] To better understand the cover assembly of this embodiment, the structure of the power battery will first be briefly described. 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 electrode assembly seals one side of the opening, forming a sealed receiving cavity, and the aforementioned electrode assembly 3 is located within the receiving cavity.

[0043] An exemplary structure of the cover plate assembly in this embodiment is as follows: Figures 1 to 8 As shown, the cover plate assembly of this embodiment mainly includes a long strip-shaped cover plate 1 and an insulating protective structure 2 disposed on the cover plate 1. The insulating protective structure 2 includes a structural body 201 attached to one side of the cover plate 1 and a protective portion 202 located on one side of the structural body 201 along the width direction of the cover plate 1.

[0044] In terms of specific structure, the protective part 202 corresponds one-to-one with the electrode lug 301 welded to the electrode post 101 of the cover plate 1. The protective parts 202 corresponding to each electrode lug 301 are arranged at intervals. Each protective part 202 is bent relative to the structural body 201 and can be connected to the structural body 201, covering the side of the corresponding electrode lug 301 facing away from the cover plate 1. Each protective part 202 is provided with a cavity 2023, and each cavity 2023 is recessed towards the side away from the cover plate 1.

[0045] 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 structural 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 structural body 201 and the cover plate 1 shall still refer to the existing technology.

[0046] 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 protective parts 202 are required. For example Figures 9 to 11 As shown, the structural body 201 is connected to the cover plate 1, and the shape of the structural body 201 is roughly the same as that of the cover plate 1. The aforementioned pole post 101 is installed on the structural body 201. Two protective parts 202 are located on one side of the structural body 201 along the width direction of the cover plate assembly, and the two protective parts 202 are arranged at intervals along the length direction of the cover plate assembly.

[0047] To improve ease of assembly and disassembly, as a preferred implementation, each protective component 202 is snap-fitted to the structural body 201. This is a quick connection method that, compared to traditional threaded connections and welding, requires no complicated tools or procedures. Using the snap-fit ​​method, once the protective component 202 is aligned with the structural body 201, assembly can be completed with a gentle push or press, significantly improving production efficiency.

[0048] 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.

[0049] To better understand the assembly process of the cover plate assembly in this embodiment, for example... Figure 9 As shown, the tab 301 of the electrode assembly 3 is welded to the electrode post 101, and the structural 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 10 The diagram shows a structure where both protective parts 202 are bent to one side of the main body 201, covering the side of the corresponding tab 301 facing away from the cover plate 1. Figure 1 The state shown is Figure 9 A schematic diagram of the structure of the middle electrode 301 after it is bent 90 degrees relative to the electrode group 3.

[0050] In one exemplary implementation, reference is made to Figure 11 As shown, the structural 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 structural 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.

[0051] As a preferred implementation method, such as Figures 11 to 14 As shown, the structural body 201 is provided with a buckle 2011, and the protective part 202 is provided with a locking hole 2024. The buckle 2011 is inserted into the locking hole 2024, so that the structural body 201 and the protective part 202 can be connected together.

[0052] For example, in this embodiment, each protective part 202 is provided with two locking holes 2024, and the buckles 2011 provided on the structural body 201 correspond one-to-one with the locking holes 2024. When the protective part 202 is bent to one side of the structural body 201, the corresponding buckles 2011 and locking holes 2024 are engaged together. For ease of description, a set of buckles 2011 and locking holes 2024 engaged together is referred to as a set of engaging structures.

[0053] In a preferred embodiment, the two locking holes 2024 are arranged near the end of the protective part 202 away from the structural body 201, and are spaced apart along the length of the cover plate 1 body. This facilitates the secure locking of the protective part 202 to one side of the structural body 201 and ensures the fit between the protective part 202 and the structural body 201 after locking.

[0054] It should be understood that the number of snap-fit ​​structures between each protective component 202 and the structural body 201 can be two sets, or other numbers, such as one set, three sets, four sets, etc. Furthermore, the snap-fit ​​structures can also be arranged in other locations, for example, at... Figure 11 As shown, the partially snap-fit ​​structure is arranged close to the main body 201.

[0055] In the structure described above, a snap fastener 2011 is mounted on the structural body 201, and a locking hole 2024 is provided in the protective part 202. When the snap fastener 2011 is engaged in the locking hole 2024, a tight fit is formed between the two. A well-designed snap fastener 2011 and locking hole 2024 can provide sufficient friction and mechanical locking force to ensure that the structural body 201 and the protective part 202 will not easily separate under normal external force.

[0056] Reference Figure 8 and Figure 13 As shown, in order to improve the snap-fit ​​effect, in a preferred embodiment, the buckle 2011 includes a snap-fit ​​part and a connecting part that connects the snap-fit ​​part to the structural body 201. The snap hole 2024 includes a first snap hole 20241 and a second snap hole 20242 that are connected to each other. The diameter of the first snap hole 20241 is smaller than the diameter of the second snap hole 20242. The connecting part is embedded in the first snap hole 20241 and the snap-fit ​​part is snapped in the second snap hole 20242.

[0057] For example, in one embodiment, the cross-sections of the first locking hole 20241 and the second locking hole 20242 are both circular, as are the cross-sections of the connecting part and the locking part. In the above structure, the buckle 2011 includes the locking part and the connecting part, while the locking hole 2024 includes the first locking hole 20241 and the second locking hole 20242 with different diameters. The connecting part is embedded in the first locking hole 20241, and the locking part is locked in the second locking hole 20242, so that the buckle 2011 can be firmly fixed in the locking hole 2024, which helps to improve the reliability of the connection between the structural body 201 and the protective part 202.

[0058] Still refer to Figure 13 As shown, in a preferred embodiment, the buckle 2011 includes a plurality of sub-buckles 20111, which are distributed at intervals around the center line a of the buckle 2011. Each sub-buckle 20111 includes a sub-buckle engagement portion 20112 that is engaged in the second buckle hole 20242, and a sub-connecting portion 20113 that connects the sub-buckle engagement portion 20112 to the structural body 201. The plurality of sub-buckle engagement portions 20112 together constitute a buckle engagement portion, and the plurality of sub-connecting portions 20113 together constitute a connecting portion.

[0059] It should be noted that when the snap fastener 2011 is engaged in the snap hole 2024, the center line of the snap fastener 2011 is collinear with the axial center line of the snap hole 2024. In some examples, there are four snap fasteners 20111, and the engaging part of each snap fastener 20111 is a sector with a central angle of 90°, and the connecting part of each snap fastener 20111 is also a sector with a central angle of 90°.

[0060] It is worth mentioning that, in order to facilitate the buckle 2011 being inserted into the card hole 2024, in a preferred embodiment, the end of the snap-fit ​​part that is first inserted into the card hole 2024 is provided with a guide part, which is used to guide the buckle 2011 to be inserted into the card hole 2024.

[0061] 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 structural body 201 is chamfered to improve the speed at which the snap-fit ​​2011 is snapped into place.

[0062] Here, the buckle 2011 includes multiple sub-buckles 20111, each sub-buckle 20111 including a sub-buckle engagement portion 20112 and a sub-connecting portion 20113. The multiple sub-buckle engagement portions 20112 together constitute the engagement portion, and the multiple sub-connecting portions 20113 together constitute the connecting portion. When the buckle 2011 is engaged in the buckle hole 2024, the multiple sub-buckle engagement portions 20112 are offset towards the center line of the buckle 2011, so that the buckle hole 2024 can be easily engaged. The engagement process is convenient, and after the engagement is completed, each sub-buckle engagement portion 20112 is reset under the action of its respective sub-connecting portion 20113, so that the buckle 2011 can be firmly engaged in the buckle hole 2024. The reliability and stability of the engagement are high.

[0063] It should be understood that when actually forming the cavity 2023, the cavity 2023 can be formed by removing material from the middle part 2021 of the protective part. Thus, when the depth of the cavity 2023 is large, the thickness of the protective part 202 is large, and more material is used during production.

[0064] For ease of understanding, please refer to Figure 14 As shown, the middle part of the protective part 202 will be referred to as the middle part 2021 of the protective part, and the edge of the protective part 202 will be referred to as the edge 2022 of the protective part.

[0065] In one example, the width W of the opening edge of the cavity 2023 pressing against the tab 301 is between 0.5mm and 12mm. For example... Figure 6 As shown, for the end of the tab 301 furthest from the electrode group 3, the width W of the opening edge of the cavity 2023 pressed against the end of the tab 301 is between 0.5mm and 12mm, such as 0.5mm, 5mm, 9mm, 12mm, etc.

[0066] Here, the width of the opening edge of the cavity 2023 pressing against the tab 301 is limited to fully accommodate the weld slag at the connection between the tab 301 and the pole post 101. It should be understood that, in other directions, the width of the opening edge of the cavity 2023 pressing against the tab 301 is at least 0.5 mm, so that the weld slag generated from welding the tab 301 and the pole post 101 can be better contained in the cavity 2023.

[0067] Continue to refer to Figure 6 As shown, the depth H of the cavity 2023 is between 1.5mm and 8.5mm, such as 1.5mm, 4mm, 6mm, 8.5mm, etc. The depth of the cavity 2023 is limited here so that the cavity 2023 can better accommodate the welding slag at the connection between the tab 301 and the pole post 101, thus reducing the risk of welding slag puncturing the diaphragm.

[0068] In a further preferred embodiment, the effective depth h of the cavity 2023 is between 0.3mm and 8mm, such as 0.3mm, 4mm, 6mm, 8mm, etc. It should be noted that the effective depth of the cavity 2023 refers to the distance between the bottom wall of the adjacent connecting ribs 2025 and the bottom wall of the cavity 2023.

[0069] Meanwhile, in order to better accommodate welding slag, the bottom wall area S of cavity 2023 is between 6 mm² and 300 mm². For example, it can be 6 mm², 70 mm², 150 mm², 200 mm², 250 mm², 300 mm², etc.

[0070] As a preferred implementation method, refer to Figure 11 and Figure 12 As shown, the central portion 2021 of each protective part is recessed towards the side away from the cover plate 1 to form a cavity 2023. During manufacturing, the thickness of the central portion 2021 and the edge 2022 of the protective part can be the same, and the cavity 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 portion 2021 of the protective part can abut against the electrode assembly 3 inside the power battery, which helps to dampen the vibration of the electrode assembly 3.

[0071] Reference Figure 14 As shown, in a preferred embodiment, the middle part 2021 of the protective part is connected to the edge 2022 of the protective part by a connecting rib 2025. Both sides of the middle part 2021 of the protective part are provided with connecting ribs 2025, and multiple connecting ribs 2025 on each side are arranged at intervals.

[0072] For example Figure 14 In the example shown, the middle part 2021 of the protective part is provided with connecting ribs 2025 on both sides along the length of the cover plate 1. There are 4 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.

[0073] 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, the middle part 2021 of the protective part is provided with strip-shaped holes on both sides. 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 dimension of the cavity 2023 in the length direction of the cover plate 1, so that the middle part 2021 of the protective part is connected only by the connecting ribs 2025 on both sides in the length direction.

[0074] For example Figure 6As shown, after the cover plate assembly is assembled onto the battery casing, there is a certain gap between the middle part 2021 of the protective part and the electrode group 3. In actual arrangement, the middle part 2021 of the protective part can also abut against the electrode group 3. In this way, when the electrode group 3 shakes, the middle part 2021 of the protective part can limit the electrode group 3 and play a good role in damping the vibration of the electrode group 3.

[0075] It should be noted that the connection ribs 2025 are provided on both sides of the middle part 2021 of the protective part. This means that the connection ribs 2025 can be provided on both sides of the middle part 2021 of the protective part in any direction. The example above is based on the connection ribs 2025 being provided on both sides of the cover plate 1 in the length direction. In addition, any direction can refer to other directions that intersect the length direction of the cover plate 1. For example, the connection ribs 2025 can be provided only on both sides of the width direction of the cover plate 1.

[0076] Still refer to Figure 12 As shown, in another example, the central portion 2021 of the protective part is provided with a plurality of connecting ribs 2025 circumferentially, and the plurality of connecting ribs 2025 are arranged at intervals around the central portion 2021 of the protective part. Specifically, along the length direction of the cover plate 1, the connecting ribs 2025 on both sides of the central portion 2021 of the protective part are consistent with those described above. In addition, along the width direction of the cover plate 1, the central portion 2021 of the protective part 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 direction of the cover plate 1.

[0077] 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 this. Figure 12 The four shown can be, for example, one, three, six, etc. In the structure above, the middle part 2021 of the protective part is connected to the edge 2022 of the protective part by a connecting rib 2025. A gap is set between adjacent connecting ribs 2025, which allows the electrolyte to flow through the gap. In addition, this connection method is also beneficial to the vibration of the middle part 2021 of the protective part, and the amount of material used is also less, which helps to save costs.

[0078] like Figure 12 As shown, in a preferred embodiment, each protective part 202 is connected to the structural body 201 via a bending portion 203. Along the length of the cover plate 1, the size of the bending portion 203 is smaller than the size of the protective part 202. In actual manufacturing, the protective part 202, the structural body 201, and the bending portion 202 are integrally molded using injection molding, which is convenient for processing.

[0079] In addition, each protective part 202 is connected to the structural body 201 through a bending part 203, and the dimension of the bending 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 structural body 201. On the other hand, the dimension of the bending 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.

[0080] In a preferred embodiment, at least one side of the bent portion 203 is provided with a glue-reducing groove 2031, such as... Figure 15 As shown, the bent portion 203 extends along the length of the cover plate 1, and the adhesive reduction groove 2031 is provided on one side of the bent portion 203 and extends along the extending direction of the bent portion 203, thus facilitating the smooth bending of the bent portion 203. It should be understood that, apart from this, the adhesive reduction groove is only provided on the other side of the bent portion 203. Alternatively, it is also possible to provide adhesive reduction grooves 2031 on both sides of the bent portion 203.

[0081] Finally, it should be noted that the material of the insulating protective structure 2 can refer to existing plastic materials, 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 middle part 2021 of the protective part on the vibration of the pole group 3.

[0082] The cover plate assembly of this embodiment, by making the insulating protective structure 2 include a structural body 201 and a protective part 202, and connecting the structural body 201 and the protective part 202, covers the side of the corresponding tab 301 facing away from the cover plate 1, which 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.

[0083] This embodiment also relates to a vehicle in which the power battery is provided with the above-described cover assembly.

[0084] In this embodiment, by applying the aforementioned cover assembly to the power battery, the safety and reliability of the power battery can be improved, thereby enhancing the safety and reliability of the vehicle.

[0085] 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 assembly for sealing an opening in a battery casing, characterized in that: It includes a long strip-shaped cover plate and an insulating protective structure disposed on the cover plate; The insulating protective structure includes a structural body attached to one side of the cover plate, and a protective portion located on one side of the structural body along the width direction of the cover plate; The protective part corresponds one-to-one with the tabs welded to the pole post of the cover plate. The protective parts corresponding to each tab are arranged at intervals. Each protective part is bent relative to the structural body and can be connected to the structural body, while covering the side of the corresponding tab facing away from the cover plate. Each of the protective parts is provided with a cavity, and each cavity is recessed toward the side away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: Each of the protective components is snapped into and connected to the main body of the structure.

3. The cover plate assembly according to claim 2, characterized in that: The main body of the structure is provided with a buckle, and the protective part is provided with a locking hole. The buckle is placed in the locking hole, so that the main body of the structure and the protective part can be locked together.

4. The cover plate assembly according to claim 3, characterized in that: The buckle includes a snap-fit ​​portion and a connecting portion that connects the snap-fit ​​portion to the structural body; The card slot includes a first card slot and a second card slot that are connected to each other. The diameter of the first card slot is smaller than the diameter of the second card slot. The connecting part is embedded in the first card slot, and the snap-fit ​​part is snap-fitted in the second card slot.

5. The cover plate assembly according to claim 4, characterized in that: The buckle includes multiple sub-buckles, which are spaced apart around the center line of the buckle. Furthermore, each of the aforementioned snap fasteners includes a snap fastening portion that is snapped into the second snap hole, and a snap connecting portion that connects the snap fastening portion to the structural body; The multiple sub-connecting parts together constitute the connecting part, and the multiple sub-connecting parts together constitute the connecting part.

6. The cover plate assembly according to claim 1, characterized in that: The cavity is formed by the middle of each protective part being recessed toward the side away from the cover plate.

7. The cover plate assembly according to claim 6, characterized in that: The middle and edge of the protective part are connected by connecting ribs; The protective part has connecting ribs on both sides of the middle section, and the connecting ribs on each side are arranged in a plurality of sequentially spaced intervals; and / or, the protective part has a plurality of connecting ribs arranged circumferentially around the middle section, and the plurality of connecting ribs are arranged at intervals around the middle section of the protective part.

8. The cover plate assembly according to any one of claims 1-7, characterized in that: Each of the protective components is connected to the structural body via a bent portion, and the size of the bent portion is smaller than the size of the protective component in the length direction of the cover plate.

9. The cover plate assembly according to claim 8, characterized in that: At least one side of the bent portion is provided with a glue-reducing groove, which extends along the extension direction of the bent portion.

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

Images