Cover assembly and battery

Abstract

The utility model relates to a kind of cover assembly and battery, belong to power battery technical field, cover assembly is applied to battery shell, and including the cover plate with pole post, and the insulating piece on the cover plate is set up. Cover plate is long strip, and the insulating piece has the insulating body with the cover plate, and the abutting portion on the width direction side of insulating body is set up by the connecting portion that can be bent, abutting portion and pole post one-to-one correspond, and it is multiple that all are along the length direction interval of insulating body setting, and the clamping portion is set between each abutting portion and insulating body.Each abutting portion can be bent relative to insulating body by connecting portion, and be connected with insulating body by clamping portion, and the abutting portion after clamping is abutted on the side of pole lug facing away from cover plate. The cover assembly of the utility model can form physical blocking structure on the side of pole lug facing away from cover plate, can better avoid pole lug reverse insertion pole group and lead to battery short circuit, and then the safety of battery can be improved.

Description

Technical Field

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

[0002] In the field of battery manufacturing, the welding of the tabs to the cover plate is one of the key processes in battery assembly. As the bridge connecting the internal electrodes of the battery to the external circuitry, the quality of the connection between the tabs and the cover plate directly affects the overall performance and safety of the battery. Currently, after the welding of the tabs to the cover plate is completed, the tabs often exhibit inconsistent shapes and are quite scattered. This situation makes it very easy for the tabs to be inserted backwards into the electrode assembly during subsequent battery assembly. When the tabs are inserted backwards into the electrode assembly, it directly causes a short circuit between the positive and negative terminals inside the battery. This not only seriously affects the battery's charge and discharge performance, leading to a decrease in battery capacity and a shortened cycle life, but may also cause safety accidents such as battery overheating, fire, or even explosion, posing a significant threat to battery safety. Utility Model Content

[0003] In view of this, the present invention aims to provide a cover assembly to improve battery safety.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A cover plate assembly is applied to a battery casing, comprising a cover plate through which terminal posts are passed, and an insulating element disposed on the cover plate; The cover plate is elongated, and the insulating member has an insulating body conforming to the shape of the cover plate, and an abutting portion provided on one side of the width direction of the insulating body through a bendable connecting part. The abutting portions correspond one-to-one with the poles, and are all multiple portions spaced apart along the length direction of the insulating body. A snap-fit ​​portion is provided between each abutting portion and the insulating body. The pole post is used to connect with the pole lug of the pole group. Each of the abutting portions can be bent relative to the insulating body through the connecting portion and connected to the insulating body through the snap-fit ​​portion. After snapping, the abutting portion abuts against the side of the pole lug that is away from the cover plate.

[0005] Furthermore, the insulating body, the connecting portion, and the abutting portion are integrally formed; The connecting part is provided with a glue-reducing groove.

[0006] Furthermore, the connecting portion includes a support rib disposed on the insulating body, and a connecting rib extending to one side in the thickness direction of the support rib; The adhesive reduction groove is provided on the connecting rib, and the ratio of the depth of the adhesive reduction groove to the thickness of the connecting rib is between 1 / 3 and 1 / 2.

[0007] Furthermore, the snap-fit ​​portion includes a snap fastener provided on the insulating body and a snap-fit ​​hole provided on the abutting portion.

[0008] Furthermore, the abutting portion has a protrusion protruding toward the insulating body, and the snap-fit ​​hole is provided at the protrusion and penetrates the abutting portion; The buckle engages with the buckle hole, and the engaging portion abuts against the insulating body through the protrusion.

[0009] 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 engaged with the abutting portion by the snap-fit ​​block.

[0010] 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 card hole, and the snap-fit ​​block is snapped into the second card hole.

[0011] Furthermore, the end of the first latch hole away from the second latch hole is provided with a guide slope, the guide slope being used to guide the latch into the latching hole; and / or, The snap-fit ​​hole is located at the end of the abutting portion away from the connecting portion.

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

[0013] Compared with the prior art, this utility model has the following advantages: (1) The cover plate assembly of the present invention provides an insulating component, which includes an insulating body and an abutting part that can be bent relative to the insulating body. After the abutting part is bent through the connecting part, it can abut against the side of the tab facing away from the cover plate, thereby forming a physical blocking structure. This can effectively prevent the tab from tilting towards the electrode assembly, and can effectively ensure that the shape of the tab remains unchanged before and after the electrode assembly is cored. This can better prevent the tab from being inserted into the electrode assembly and causing a short circuit in the battery, thereby improving the safety of the battery.

[0014] (2) By integrally molding the insulation body, connecting part, and abutting part, the number of processes can be reduced, labor costs can be lowered, and product defects caused by poor assembly of separate structures can be effectively avoided. Furthermore, by integrating the insulation body, connecting parts, and abutting parts into a single unit, product defects can be minimized. The joint is equipped with a rubber-reducing groove, which can reduce the local material thickness and rigidity of the joint, making the joint more prone to elastic deformation when bent. This facilitates bending the abutting part to the insulating body during assembly, thereby improving assembly efficiency.

[0015] (3) The connecting part includes a support rib provided on the insulating body, a connecting rib extending to one side of the support rib, and a rubber-reducing groove provided on the connecting rib. Thus, a structure combining the skeleton and the extension arm can be formed. While ensuring that the abutting part can be flexibly bent, the rigid support of the support rib maintains the stability of the overall structure, which helps to ensure that the abutting part is not easy to loosen during long-term use and is conducive to playing a limiting role for the electrode tab. The ratio of the depth of the rubber-reducing groove to the thickness of the connecting rib is set between 1 / 3 and 1 / 2, which allows the connecting rib to be easily bent during assembly and can withstand the pressure of the electrode tab without failure during use.

[0016] (4) Since the insulating body is located on one side of the cover plate, the snap-fit ​​part includes a snap fastener on the insulating body and a snap-fit ​​hole on the abutting part. Thus, after the abutting part is snapped with the insulating body, the snap fastener can be exposed on the outside, which makes it easy to operate the snap fastener to separate the abutting part from the insulating body, and facilitates later maintenance and assembly.

[0017] (5) By setting a protrusion on the abutting part and setting the snap-fit ​​hole at the protrusion, and the abutting part after snapping abutting abutting abutting with the insulating body through the protrusion, the structural strength at the snap-fit ​​hole can be improved, which is conducive to ensuring the snap-fit ​​strength between the insulating body of the abutting part. Moreover, the abutting with the insulating body through the protrusion can improve the firmness of the abutting part, thereby improving the fixing effect of the electrode tab.

[0018] (6) By making the snap fastener include multiple sub-snap fasteners spaced circumferentially along the snap-fit ​​hole, and making each sub-snap fastener include a connecting block and a snap-fit ​​block, when the snap fastener is snapped into the snap-fit ​​hole, the multiple snap-fit ​​blocks can easily shift together towards the center line of the snap fastener, so that the snap fastener can be smoothly snapped into the snap-fit ​​hole, thereby simplifying the snap-fit ​​process and improving assembly efficiency. Moreover, after the snap-fit ​​is completed, each snap-fit ​​block is reset under the action of its respective sub-connecting block, so that the snap fastener can be firmly snapped into the snap-fit ​​hole, thereby improving the reliability of the snap-fit.

[0019] (7) By making the snap-fit ​​hole include a first snap-fit ​​hole and a second snap-fit ​​hole, and the diameter of the first snap-fit ​​hole is smaller than that of the second snap-fit ​​hole, the connecting block can play a preliminary positioning role after being inserted into the first snap-fit ​​hole. When the snap-fit ​​block is snapped into the second snap-fit ​​hole, a radial limit is formed, which can effectively prevent the buckle from coming out axially or radially. Setting the second snap-fit ​​hole to a larger diameter can provide a larger snap-fit ​​space for the snap-fit ​​block, which can increase the contact area between the two and thus improve the snap-fit ​​firmness between the abutting part and the insulating body.

[0020] (8) By setting a guide slope on the first snap-fit ​​hole to guide the snap-fit ​​buckle into the snap-fit ​​hole, the difficulty of aligning the snap-fit ​​buckle with the snap-fit ​​hole can be reduced, which facilitates the snap-fit ​​buckle to quickly snap into the snap-fit ​​hole, thereby improving assembly efficiency. Furthermore, placing the snap-fit ​​hole at the end of the abutment portion away from the connecting portion prevents warping at that end, thus ensuring the effective fixation of the electrode tab. (9) Set the engagement length W1 of each snap-fit ​​block and the abutment portion in the radial direction of the snap-fit ​​hole to 0.35. The spacing between the locking blocks and the contact points is between -0.65mm, ensuring both a secure lock-on position within the locking holes and easy, quick insertion and removal. The engagement area between each locking block and the contact portion is approximately 0.25mm. 2 -1.5 mm 2 The spacing between the clips ensures a tight fit between the clips and the locking holes, effectively preventing material deformation or wear due to excessive compression and improving the long-term stability of the locking structure. Furthermore, setting the thickness P of each clip along the axial direction of the locking hole between 0.6mm and 4.5mm helps ensure the clips maintain rigidity under the pressure of the tabs, while avoiding excessive thickness that would hinder lightweight design. Attached Figure Description

[0021] 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 a schematic diagram of the cover plate assembly described in an embodiment of the present utility model from a first perspective. Figure 2 This is a schematic diagram of the cover plate assembly described in an embodiment of the present utility model from a second perspective. Figure 3 This is a first-view structural schematic diagram of the insulating component described in an embodiment of the present invention; Figure 4 This is a schematic diagram of the insulating component described in an embodiment of the present invention from a second perspective. Figure 5 This is a structural schematic diagram of the insulating component described in an embodiment of the present utility model from a third-view perspective; Figure 6 for Figure 2 Enlarged view of section A; Figure 7 for Figure 5 A cross-sectional view of the CC line; Figure 8 for Figure 3 Enlarged view of section B; Figure 9 This is the assembly state of the electrode assembly and cover plate assembly described in this embodiment of the invention before the electrode lugs are bent; Figure 10 This is the assembly state of the electrode assembly and cover plate assembly after the electrode lug is bent, as described in this embodiment of the utility model. Figure 11 This is a schematic diagram of the battery structure described in an embodiment of the present invention from another perspective; Figure 12 for Figure 11 Sectional view of the DD line; Figure 13 for Figure 11 A cross-sectional view of the EE line; Figure 14 for Figure 13 Enlarged view of section F in the middle; Figure 15 This is a schematic diagram of another structure of the insulating component described in an embodiment of the present utility model; Figure 16 for Figure 15 The diagram shown is a structural illustration from another perspective; Figure 17 This is a schematic diagram illustrating the application of another insulating structure in a battery.

[0022] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Insulating components; 201. Insulating body; 2011. Buckle; 20111. Sub-buckle; 201111. Connecting block; 201112. Snap-fit ​​block; 2012. Through hole; 202. Abutting part; 2021. Snap-fit ​​hole; 202111. First snap-fit ​​hole; 202112. Second snap-fit ​​hole; 202113. Guide slope; 2022. Protrusion; 2023. Protective cavity; 2024. Notch; 203. Connection part; 2031. Supporting rib; 2032. Connecting rib; 3. Pole post; 4. Polar ears; 5. Pole group; K, Glue Reduction Groove. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] 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.

[0025] 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.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1 In existing technologies, after the welding of tab 4 to cover plate 1 is completed, tab 4 often exhibits inconsistent shapes and is quite scattered. This situation makes it very easy for tab 4 to be inserted backwards into electrode group 5 during subsequent battery assembly. When tab 4 is inserted backwards into electrode group 5, it directly causes a short circuit between the positive and negative electrodes inside the battery. This not only seriously affects the battery's charge and discharge performance, leading to a decrease in battery capacity and a shortened cycle life, but may also cause safety accidents such as battery overheating, fire, or even explosion, posing a significant threat to battery safety.

[0028] Therefore, an embodiment of the first aspect of this invention provides a cover plate assembly applied to a battery casing, including a cover plate 1 through which terminal posts 3 are inserted, and an insulating member 2 disposed on the cover plate 1. The cover plate 1 is elongated, and the insulating member 2 has an insulating body 201 conforming to the shape of the cover plate 1, and an abutment portion 202 disposed on one side of the insulating body 201 in the width direction via a bendable connecting portion 203. Each abutment portion 202 corresponds to one terminal post 3, and multiple abutment portions 202 are spaced apart along the length direction of the insulating body 201. A snap-fit ​​portion is provided between each abutment portion 202 and the insulating body 201.

[0029] The pole post 3 is used to connect with the pole tab 4 of the pole group 5. Each abutting part 202 can be bent relative to the insulating body 201 through the connecting part 203 and connected to the insulating body 201 through the snap-fit ​​part. After snap-fitting, the abutting part 202 abuts against the side of the pole tab 4 facing away from the cover plate 1.

[0030] At this point, by providing an insulating component 2, which includes an insulating body 201 and an abutment portion 202 that can be bent relative to the insulating body 201, and by bending the abutment portion 202 through the connecting portion 203, a physical blocking structure is formed on the side of the tab 4 facing away from the cover plate 1. This effectively prevents the tab 4 from tilting towards the electrode assembly 5, ensuring that the shape of the tab 4 remains unchanged before and after the electrode assembly 5 is closed, thus better preventing the tab 4 from being inserted backwards into the electrode assembly 5 and causing an internal short circuit, thereby improving battery safety.

[0031] Furthermore, by ensuring that the abutting portion 202 corresponds one-to-one with the pole post 3, each pole tab 4 can be independently blocked, which can further effectively prevent the pole tabs 4 from shifting or being inserted upside down, and can avoid the problems of inconsistent shape and scattered distribution of the pole tabs 4 due to lack of fixation after welding. Moreover, the abutting portion 202 is connected to the insulating body 201 through the snap-fit ​​part, which not only ensures a good connection between the two, but also has a simple structure and is easy to disassemble and assemble.

[0032] Based on the above overall introduction, specifically, as an exemplary structural form, combined with Figures 1 to 14 As shown, similar to existing technologies, the cover assembly typically includes, in addition to the cover plate 1, electrode post 3, and insulating member 2, an upper plastic layer disposed between the electrode post 3 and the other side of the cover plate 1, and a sealing member disposed between the cover plate 1 and the electrode post 3. Furthermore, the specific structure of the electrode post 3, the mounting method of the electrode post 3 and the insulating member 2 on the cover plate 1, and the structure of the upper plastic layer and the sealing member can all refer to existing structures; this embodiment does not make any improvements in these aspects.

[0033] Moreover, generally speaking, such as Figure 1 As shown, the terminals 3 are generally two terminals spaced apart along the length of the cover plate 1. The tabs 4 and the contact portions 202 on the terminal group 5 are correspondingly arranged one-to-one with the two terminals 3, and the two tabs 4 are welded to the two terminals 3 one-to-one. The insulating component 2 is usually sandwiched between the terminals 3 and the cover plate 1. Its specific structure can be found in existing technology. This embodiment focuses on describing the structure of the insulating component 2. Furthermore, the insulating component 2 can be made of the insulating material commonly used in the upper and lower plastics of the existing battery cover plate 1, and no specific limitation is made here.

[0034] In some of the exemplary implementations, such as Figure 8As shown, the insulating body 201, connecting part 203, and abutting part 202 are integrally formed, and a reducing groove K is provided on the connecting part 203. This design reduces processes and labor costs, while also effectively avoiding product defects caused by poor assembly of the separate structure. By providing the reducing groove K on the connecting part 203, the local material thickness and rigidity of the connecting part 203 can be weakened, making it easier for the connecting part 203 to undergo elastic deformation when bent. This facilitates bending the abutting part 202 onto the insulating body 201 during assembly, improving assembly efficiency. At the same time, the reducing groove K also prevents material tearing or fatigue damage caused by excessive bending, extending the service life of the insulating component 2.

[0035] In specific implementation, combined with Figure 3 and Figure 4 As shown, two pole posts 3 are located at both ends of the cover plate 1 along its length. Correspondingly, through holes 2012, corresponding to the pole posts 3, are provided at both ends of the insulating body 201 along its angular direction. Simultaneously, two abutment portions 202 are located at both ends of the insulating body 201 along its length, corresponding to the two through holes 2012, and a vent is provided between the two through holes 2012. This vent corresponds to the explosion-proof valve on the cover plate 1. Furthermore, each abutment portion 202 is approximately rectangular to provide a larger abutment area against the tab 4, thereby further improving the fixing effect on the tab 4.

[0036] Furthermore, the connecting portion 203 is located at the middle of the abutting portion 202 along its length and extends along the length of the abutting portion 202, thereby enabling the abutting portion 202 and the insulating body 201 to have good connection strength. Additionally, the adhesive-reducing groove K extends through the connecting portion 203 along its length, facilitating the bending of the abutting portion 202 relative to the insulating body 201.

[0037] In some exemplary embodiments, the connecting portion 203 includes a support rib 2031 provided on the insulating body 201, and a connecting rib 2032 extending to one side in the thickness direction of the support rib 2031. Furthermore, a reducing groove K is provided on the connecting rib 2032, and the ratio of the depth of the reducing groove K to the thickness of the connecting rib 2032 is between 1 / 3 and 1 / 2. This forms a structure combining a skeleton and an extension arm, ensuring that the abutment portion 202 can be flexibly bent while maintaining the overall structural stability through the rigid support of the support rib 2031. This ensures that the abutment portion 202 is not easily loosened during long-term use, facilitating its limiting function on the tab 4. Setting the ratio of the depth of the reducing groove K to the thickness of the connecting rib 2032 to between 1 / 3 and 1 / 2 allows the connecting rib 2032 to be easily bent during assembly, while also being able to withstand the pressure of the tab 4 during use without failure.

[0038] In specific implementation, combined with Figure 8 and Figure 12 As shown, the support rib 2031 extends along the length of the insulating body 201 and protrudes to one side in the thickness direction of the insulating body 201. The connecting rib 2032 is located at the end of the support rib 2031 away from the insulating body 201 and is a plate-like structure of uniform thickness extending outwards from the insulating body 201 to connect with the abutment portion 202, while also facilitating bending. The ratio of the depth of the adhesive reduction groove K to the thickness of the connecting rib 2032 can be, for example, 1 / 3, 5 / 12, 1 / 2, or other values.

[0039] In some exemplary embodiments, the snap-fit ​​portion includes a snap-fit ​​2011 provided on the insulating body 201 and a snap-fit ​​hole 2021 provided on the abutment portion 202. Thus, after the abutment portion 202 is snapped into the insulating body 201, the snap-fit ​​2011 can be exposed on the outside, thereby facilitating the operation of the snap-fit ​​2011 to separate the abutment portion 202 from the insulating body 201, which is convenient for later maintenance and assembly.

[0040] In practice, such as Figure 3 and Figure 4 As shown, the snap-fit ​​hole 2021 is located at the end of the abutment portion 202 away from the connecting portion 203. This design prevents the end of the abutment portion 202 away from the connecting portion 203 from warping, thereby ensuring the fixing effect of the tab 4. In addition, a snap-fit ​​hole 2021 is provided at both ends of the abutment portion 202 along its length, that is, two snap-fit ​​holes 2021 are provided at intervals, and the buckle 2011 is provided in a one-to-one correspondence with the snap-fit ​​hole 2021.

[0041] It should be noted that, in addition to placing the snap fastener 2011 on the insulating body 201 and the snap-fit ​​hole 2021 on the abutting portion 202, the snap fastener 2011 can also be placed on the abutting portion 202 and the snap-fit ​​hole 2021 on the insulating body 201. Furthermore, the number of snap-fit ​​holes 2021 is not limited to the two shown in the figure; their position and number can be adjusted according to design requirements.

[0042] In some exemplary embodiments, the abutting portion 202 has a protrusion 2022 protruding toward the insulating body 201, and a snap-fit ​​hole 2021 is provided at the protrusion 2022 and extends through the abutting portion 202. Furthermore, a snap fastener 2011 snaps into the snap-fit ​​hole 2021, and the abutting portion 202, after snapping, abuts against the insulating body 201 through the protrusion 2022.

[0043] At this time, by providing a protrusion 2022 on the abutting portion 202 and setting the snap-fit ​​hole 2021 at the protrusion 2022, the abutting portion 202 after snapping abuts against the insulating body 201 through the protrusion 2022. This not only improves the structural strength at the snap-fit ​​hole 2021, ensuring the snap-fit ​​strength between the abutting portion 202 and the insulating body 201, but also enhances the firmness of the abutting portion 202 through the abutment between the protrusion 2022 and the insulating body 201, thereby improving the fixing effect on the electrode tab 4. In specific implementation, combined with... Figure 4 and Figure 14 As shown, the protrusion 2022 is, for example, set to a cylindrical shape. Of course, in addition to setting the protrusion 2022 to a cylindrical shape, it is also possible to set it to a rectangular or irregular shape.

[0044] In some exemplary embodiments, the snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap hole 2021. Each sub-snap fastener 20111 has a connecting block 201111 connected to the insulating body 201, and a snap block 201112 protruding radially outward from the connecting block 201111 along the snap fastener 2011. The snap fastener 2011 is snapped onto the abutment portion 202 by the snap block 201112.

[0045] At this time, when the snap fastener 2011 is engaged in the snap-fit ​​hole 2021, the multiple snap-fit ​​blocks 201112 can easily shift towards the center line of the snap fastener 2011, allowing the snap fastener to smoothly engage in the snap-fit ​​hole 2021, thereby simplifying the snap-fit ​​process and improving assembly efficiency. Moreover, after the snap-fit ​​is completed, each snap-fit ​​block 201112 resets under the action of its respective connecting block 201111, allowing the snap fastener 2011 to be firmly engaged in the snap-fit ​​hole 2021, thus improving the reliability of the snap-fit.

[0046] In specific implementation, combined with Figure 6 As shown, four individual snap fasteners 20111 are evenly distributed circumferentially along the snap-fit ​​hole 2021. This design allows the external force on the contact portion 202 to be evenly distributed to the insulating body 201, avoiding localized stress concentration. Compared to a smaller number of individual snap fasteners 20111, the four individual snap fasteners 20111 form a stable support structure. When the tab 4 is subjected to force and shifts, each individual snap fastener 20111 can collectively provide a reaction force, effectively suppressing the loosening or deformation of the contact portion 202. This enhances the overall strength and reliability of the snap-fit ​​structure and reduces the risk of the tab 4 being inserted incorrectly.

[0047] It should be noted that, in addition to the four evenly distributed snap fasteners 20111 shown in the figure, the number can also be three or five, or other quantities. Furthermore, besides evenly distributing multiple snap fasteners 20111 along the circumference of the snap-fit ​​holes 2021, they can also be distributed unevenly according to design requirements.

[0048] In some exemplary embodiments, the snap-fit ​​hole 2021 includes a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112 that are connected. The diameter of the first snap-fit ​​hole 202111 is smaller than the diameter of the second snap-fit ​​hole 202112. A connecting block 201111 is inserted into the first snap-fit ​​hole 202111, and a snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112. Thus, after the connecting block 201111 is inserted into the first snap-fit ​​hole 202111, it provides initial positioning. When the snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112, it forms a radial limit, effectively preventing the snap-fit ​​2011 from disengaging axially or radially. Setting the second snap-fit ​​hole 202112 to a larger diameter provides a larger snap-fit ​​space for the snap-fit ​​block 201112, increasing the contact area between the two and thus improving the snap-fit ​​strength between the abutment portion 202 and the insulating body 201.

[0049] In some exemplary embodiments, the end of the first latch 202111 away from the second latch 202112 is provided with a guide slope 202113, which is used to guide the latch 2011 into the latching hole 2021. This reduces the difficulty of aligning the latch 2011 with the latching hole 2021, facilitating the quick insertion of the latch 2011 into the latching hole 2021, thereby improving assembly efficiency.

[0050] In specific implementation, combined with Figure 3 , Figure 4 and Figure 7 As shown, the first card hole 202111 and the second card hole 202112 are both round holes, and the guide slope 202113 is a conical surface located at the end of the first card hole 202111.

[0051] In some exemplary embodiments, the spacing W between two adjacent snap fasteners 20111 is between 1.2mm and 1.8mm. This allows the snap fasteners 20111 to maintain sufficient rigidity during engagement while also achieving a tight fit through moderate elastic deformation, ensuring a secure connection and preventing loosening. In specific implementations, such as... Figure 5 and Figure 6 As shown, for example, the distance W between two adjacent snap fasteners 20111 can be set to 1.2mm, 1.5mm, 1.7mm, 1.8mm or other values.

[0052] In some exemplary embodiments, the engagement length W1 between each snap-fit ​​block 201112 and the abutment portion 202 in the radial direction of the snap-fit ​​hole 2021 is between 0.35mm and 0.65mm, and the engagement area between each snap-fit ​​block 201112 and the abutment portion 202 is between 0.25mm² and 1.5mm². In this case, setting the engagement length W1 between each snap-fit ​​block 201112 and the abutment portion 202 in the radial direction of the snap-fit ​​hole 2021 to between 0.35mm and 0.65mm not only ensures that the snap-fit ​​block 201112 is securely locked within the snap-fit ​​hole 2021, but also facilitates quick insertion and removal of the snap-fit ​​block 201112.

[0053] The engagement area between each snap-fit ​​block 201112 and the abutment portion 202 is 0.25mm. 2 -1.5mm 2 This design ensures a tight fit between the snap-fit ​​block 201112 and the snap-fit ​​hole 2021, while also effectively preventing material deformation or wear caused by excessive compression, thus improving the long-term stability of the snap-fit ​​structure.

[0054] In specific implementation, such as Figure 14 As shown, for example, the engagement length W1 of the snap-fit ​​block 201112 and the abutment portion 202 in the radial direction of the snap-fit ​​hole 2021 can be set to 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.6mm, 0.65mm, or other values. Additionally, for example, the engagement area between each snap-fit ​​block 201112 and the abutment portion 202 can be set to 0.25mm. 2 0.5mm 2 0.8mm 2 1.0mm 2 1.2mm 2 1.5mm 2 Or other values.

[0055] In some exemplary embodiments, the thickness P of each snap-fit ​​block 201112 in the axial direction of the snap-fit ​​hole 2021 is between 0.6mm and 4.5mm. This arrangement helps ensure that the snap-fit ​​block 201112 maintains rigidity when subjected to the pressure of the tab 4, while avoiding excessive thickness that would hinder lightweight design. In specific implementations, such as... Figure 14 As shown, for example, the thickness P of each snap-fit ​​block 201112 in the axial direction of the snap-fit ​​hole 2021 is set to 0.6mm, 1.5mm, 2.5mm, 3.5mm, 4.5mm or other values.

[0056] The cover assembly of this embodiment, by adopting the above structure, can form a physical blocking structure on the side of the tab 4 facing away from the cover plate 1. This effectively ensures that the shape of the tab 4 remains unchanged before and after the electrode assembly 5 is assembled, and can better prevent the tab 4 from being inserted backwards into the electrode assembly 5, thus avoiding a short circuit in the battery and improving battery safety. Moreover, the abutting part 202 and the insulating body 201 are connected by a snap-fit ​​part, which not only provides a good connection between the two, but also has a simple structure and is easy to assemble and disassemble.

[0057] Furthermore, another objective of this embodiment is to propose a battery, such as Figures 9 to 14 As shown, the battery casing is provided with the cover assembly as described above.

[0058] In this embodiment, the battery, by setting the cover assembly as described above, can better prevent the tab 4 from being inserted backwards into the electrode group 5 or the separator, thus avoiding a short circuit and improving battery safety.

[0059] Example 2 This embodiment also relates to a cover plate assembly, combined with Figures 15 to 17 As shown, its overall structure is the same as that of Embodiment 1, except that, corresponding to the through hole 2012 on the insulating body 201, a protective cavity 2023 with an open end is further formed on each abutment portion 202. Furthermore, the protective cavity 2023 is recessed to the side away from the insulating body 201, which can better accommodate the welding slag at the welding position of the tab 4, thereby reducing the risk of welding slag piercing the separator and causing a short circuit in the battery, and improving the safety performance of the battery.

[0060] In some exemplary embodiments, a notch 2024 is provided on the abutment portion 202 at the edge of the opening end of the protective cavity 2023, the notch 2024 being for the flow of electrolyte. In specific implementations, such as... Figure 16 As shown, the protective cavity 2023 is rectangular, and multiple notches 2024 are provided at intervals on each edge of the protective cavity 2023.

[0061] In some of the exemplary implementations, such as Figure 17 As shown, the depth of the protective cavity 2023 is less than the distance between the bent part 202 of the electrode tab 4 and the electrode group 5, thereby creating a certain gap between the protective cavity 2023 and the electrode group 5.

[0062] In some exemplary embodiments, the opening area of ​​the notch 2024 can be relatively large to give the protective cavity 2023 a certain degree of elasticity. Furthermore, the depth of the protective cavity 2023 is made equal to the distance between the bent tab 4 and the electrode assembly 5, so that the protective cavity 2023 abuts against the electrode assembly 5. Therefore, when the electrode assembly 5 shakes up and down, the protective cavity 2023 can buffer the shaking of the electrode assembly 5, achieving the purpose of protecting the electrode assembly 5. This can solve the risk of the tab 4 tearing and the separator puncturing due to the shaking of the electrode assembly 5, and further improve the safety performance of the battery.

[0063] The cover assembly of this embodiment can also better prevent the battery from short-circuiting due to the tab 4 being inserted backward into the electrode group 5, and can also improve the safety of the battery.

[0064] 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, applied to a battery casing, characterized in that: Includes a cover plate through which the pole is inserted, and an insulating element disposed on the cover plate; The cover plate is elongated, and the insulating member has an insulating body conforming to the shape of the cover plate, and an abutting portion provided on one side of the width direction of the insulating body through a bendable connecting part. The abutting portions correspond one-to-one with the poles, and are all multiple portions spaced apart along the length direction of the insulating body. A snap-fit ​​portion is provided between each abutting portion and the insulating body. The pole post is used to connect with the pole lug of the pole group. Each of the abutting portions can be bent relative to the insulating body through the connecting portion and connected to the insulating body through the snap-fit ​​portion. After snapping, the abutting portion abuts against the side of the pole lug that is away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The insulating body, the connecting part, and the abutting part are integrally formed; The connecting part is provided with a glue-reducing groove.

3. The cover plate assembly according to claim 2, characterized in that: The connecting portion includes a support rib disposed on the insulating body, and a connecting rib extending to one side in the thickness direction of the support rib. The adhesive reduction groove is provided on the connecting rib, and the ratio of the depth of the adhesive reduction groove to the thickness of the connecting rib is between 1 / 3 and 1 / 2.

4. The cover plate assembly according to claim 1, characterized in that: The snap-fit ​​portion includes a snap fastener provided on the insulating body and a snap-fit ​​hole provided on the abutting portion.

5. The cover plate assembly according to claim 4, characterized in that: The abutting portion has a protrusion that protrudes toward one side of the insulating body, and the snap-fit ​​hole is provided at the protrusion and penetrates the abutting portion; The buckle engages with the buckle hole, and the engaging portion abuts against the insulating body through 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 engaged with the abutting portion 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 card hole, and the snap-fit ​​block is snapped into the second card hole.

8. The cover plate assembly according to claim 7, characterized in that: The end of the first latch hole away from the second latch hole is provided with a guide slope, the guide slope being used to guide the latch into the latching hole; and / or, The snap-fit ​​hole is located at the end of the abutting portion away from the connecting portion.

9. The cover plate assembly according to claim 6, characterized in that: The engagement length W1 between each of the snap-fit ​​blocks and the abutting portion in the radial direction of the snap-fit ​​hole is between 0.35mm and 0.65mm, and the engagement area between each of the snap-fit ​​blocks and the abutting portion is 0.25mm. 2 -1.5mm 2 Between; and / or, The thickness P of each of the said snap-fit ​​blocks along the axial direction of the snap-fit ​​hole is between 0.6mm and 4.5mm.

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

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