Battery and cover plate assembly thereof

Abstract

The application provides a battery and a cover plate assembly thereof. The cover plate assembly comprises a cover plate with a pole passing therethrough, and a lower plastic arranged on the cover plate. The cover plate is in a strip shape. The lower plastic has a main body part arranged in the shape of the cover plate, and a protection part arranged at each end of the main body part in the length direction. A clamping part is arranged between the protection part and the main body part. The pole is used to connect with a tab of a pole group. Each protection part can be bent relative to the main body part and connected with the main body part through the clamping part. After clamping, the protection part abuts against a side of the tab at the corresponding end which is away from the cover plate. The cover plate assembly can generate a pressing force on the tab after the protection part is connected with the main body part, so as to fix the shape and position of the tab, and effectively prevent the tab from being displaced and short-circuited due to abnormal contact. Meanwhile, the constraint of the protection part on the tab can also avoid the tab from being scattered and dropped at will, and reduce the occupation of the internal space by the tab.

Description

Technical Field

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

[0002] In the field of battery manufacturing technology, the structural design of the cover plate assembly plays a crucial role in battery performance and safety. Currently, to ensure the insulation safety of the battery's internal circuitry, a plastic layer is typically placed between the cover plate and the tabs to achieve electrical isolation between the two. While this structure effectively protects the battery's insulation performance...

[0003] However, the relevant technology still has significant drawbacks: the lack of an effective shaping and fixing structure between the tabs and the electrode assembly. This results in inconsistent states among the tabs after bending, leading to significant morphological differences. This not only affects the regularity of the battery's internal structure but also causes the tabs to occupy excessive space within the battery, resulting in low space utilization. Furthermore, the inconsistency and looseness of the tab shapes can easily lead to problems such as tab displacement and abnormal contact, thereby creating a short-circuit risk, seriously threatening battery safety, and limiting further improvements in battery product performance. Utility Model Content

[0004] In view of this, this application aims to provide a cover assembly to improve battery safety.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly, applied to a battery casing, includes a cover plate through which terminal posts are inserted, and a lower plastic layer disposed on the cover plate; The cover plate is elongated, and the lower plastic has a main body portion that conforms to the shape of the cover plate, and protective portions at both ends of the main body portion along its length, with a snap-fit ​​portion between the protective portions and the main body portion; The pole post is used to connect with the pole lugs of the pole group. Each of the protective parts can be bent relative to the main body and connected to the main body through the snap-fit ​​part. After snapping, the protective part abuts against the side of the pole lug at the corresponding end that is away from the cover plate.

[0006] Furthermore, the main body and the protective part are integrally formed, and the protective part includes a protective plate for abutting the electrode tab and a connecting ear connected to the main body; The connecting ear protrudes to one side of the protective plate and has a hollow hole along its length. The main body has notches on both sides of the connecting ear along its length.

[0007] Furthermore, the main body and the protective part are integrally formed, and the main body has a plate and a connecting rib protruding to one side of the plate; The connecting rib is connected to the protective part, and a glue-reducing groove is provided at the connection between the two.

[0008] Furthermore, the snap-fit ​​portion includes a buckle provided on the main body portion and a snap-fit ​​hole provided on the protective portion.

[0009] Furthermore, the protective part is provided with a snap-fit ​​protrusion protruding towards one side of the main body part, and the snap-fit ​​hole is provided at the snap-fit ​​protrusion and penetrates the protective part; After being snapped in, the protective portion abuts against the main body portion via the snap-in protrusion.

[0010] Furthermore, the protrusion height of the connecting protrusion is the same as the protrusion height of the snap-fit ​​protrusion.

[0011] 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 main 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.

[0012] 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, the snap-fit ​​block is snapped into the second card hole, and the end of the snap-fit ​​block away from the connecting block is recessed relative to the protective part.

[0013] Furthermore, the distance W between two adjacent snap fasteners is between 1.2mm and 1.8mm; and / or, The engagement length W1 between each of the snap-fit ​​blocks and the protective portion in the radial direction of the snap-fit ​​hole is 0.35. Between -0.65mm.

[0014] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application, by providing protective portions at both ends of the main body along its length on the lower plastic and providing snap-fit ​​portions between the protective portions and the main body, can not only further expand the insulation coverage and improve the battery insulation safety, but also, after the protective portions are connected to the main body through the snap-fit ​​portions, can exert pressure on the tabs, thereby fixing the shape and position of the tabs and effectively preventing the tabs from shifting or making abnormal contact, thus preventing the risk of short circuits. At the same time, the restraining effect of the protective portions on the tabs can also prevent the tabs from spreading out or falling down at will, reducing the space occupied by the tabs and improving the space utilization rate of the battery.

[0015] (2) The main body and the protective part are integrally formed, which can improve production efficiency; while the connecting ears of the protective part protrude to the side of the protective plate, and the connecting ears are provided with hollow holes along the length direction, which can not only reduce the weight of the protective part, but also enhance its strength and toughness, making it easier to bend the protective part relative to the main body and to snap the protective part and the main body together.

[0016] (3) Molding the main body and the protective part into one piece can improve production efficiency. By setting connecting ribs, the strength and rigidity of the connection between the main body and the protective part can be enhanced. At the same time, it is also convenient to form a flat space between the protective part and the main body to accommodate the electrode tab after bending, which can prevent excessive compression of the electrode tab. The setting of the rubber reduction groove makes the connection between the connecting rib and the protective part have a certain degree of flexibility. When the protective part is bent relative to the main body, the rubber reduction groove can provide a certain deformation space for the connection, avoiding bending difficulties or damage to the connection due to excessive rigidity. This makes the bending operation of the protective part smoother and ensures that the contact effect between the protective part and the electrode tab is stable after snapping.

[0017] (4) Since the main body is located on one side of the cover plate, the snap-fit ​​part includes a snap-fit ​​buckle on the main body and a snap-fit ​​hole on the protective part. Thus, after the protective part and the main body are snapped together, the snap-fit ​​buckle can be exposed on the outside, so that the snap-fit ​​buckle can be operated to separate the protective part from the main body, which is convenient for later maintenance and assembly.

[0018] (5) By setting a snap-fit ​​protrusion on the protective part and setting the snap-fit ​​hole at the snap-fit ​​protrusion, and the protective part after snapping abutting against the main part through the snap-fit ​​protrusion, the structural strength at the snap-fit ​​hole can be improved, which is conducive to ensuring the snap-fit ​​strength between the protective part and the main part. Moreover, the abutting between the snap-fit ​​protrusion and the main part can improve the firmness of the protective part, thereby improving the fixing effect of the electrode ear.

[0019] (6) By making the protrusion height of the connecting rib and the snap-fit ​​protrusion consistent, the supporting force on both ends of the protective part (the connection point of the connecting rib and the abutment point of the snap-fit ​​protrusion) is on the same plane after snap-fit, avoiding the tilting or twisting of the protective part due to the height difference. This can effectively disperse the force of the protective part on the electrode ear, prevent the connecting rib or snap-fit ​​protrusion from being broken due to excessive local stress, and also ensure the uniformity of the force on each part of the electrode ear. This can effectively avoid the local lifting or excessive bending of the electrode ear due to the height difference, and improve the consistency of the electrode ear state.

[0020] (7) 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.

[0021] (8) 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 inserted 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 protective part and the main body.

[0022] (9) The depth h of the first locking hole 202111 is between 0.55mm and 2.8mm, and the height H of the connecting block 201111 is between 0.8mm and 2.8mm. This allows the connecting block to undergo moderate elastic deformation after insertion, providing a lasting locking force. This helps ensure a tight connection between the protective part and the main body, preventing the tabs from shifting under conditions such as battery vibration, charging and discharging expansion, and reducing the risk of short circuits. The locking length W1 of each locking block and the protective part in the radial direction of the locking hole is set between 0.35mm and 0.65mm. This not only ensures that the locking block is firmly locked in the locking hole, but also facilitates quick insertion and removal of the locking block.

[0023] In addition, this application also relates to a battery having a cover assembly as described above on its casing.

[0024] The battery described in this application, by providing the cover assembly as described above, can have better safety. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 2 This is a schematic diagram of the cover plate assembly described in this application before the protective portion is bent. Figure 3 This is a schematic diagram of the cover plate assembly described in this application before the protective portion is bent, viewed from another angle. Figure 4 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a first-view perspective; Figure 5 This is a schematic diagram of the lower plastic material from a second perspective, as described in an embodiment of this application. Figure 6 for Figure 3 Enlarged view of part A Figure 7 for Figure 4 Enlarged view of section B; Figure 8 for Figure 5 A cross-sectional view of the CC line; Figure 9 This is a diagram illustrating the assembly process of the cover plate assembly and the electrode assembly as described in the embodiments of this application. Figure 10 This is an assembly diagram of the cover plate assembly and the pole group described in the embodiments of this application; Figure 11 for Figure 10 A schematic diagram of the structure shown 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 a second structure of the cover plate assembly described in an embodiment of this application; Figure 16 This is an assembly state diagram of the second structure of the cover plate assembly described in the embodiments of this application and the pole group; Figure 17 for Figure 16 A schematic diagram of the structure shown from another perspective; Figure 18 for Figure 17 A cross-sectional view of the GG line in the middle; Figure 19 This is a schematic diagram of a third structure of the cover plate assembly described in an embodiment of this application; Figure 20 This is a schematic diagram of the third structure of the cover plate assembly described in the embodiments of this application, before the protective portion is bent, from another perspective. Figure 21 for Figure 20 Enlarged view of section H in the middle; Figure 22 This is a cross-sectional view of a third structure of the cover plate assembly of this application; Figure 23 for Figure 22 Enlarged view of section I.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Lower plastic; 201. Main body; 2011. Buckle; 20111. Sub-buckle; 201111. Connecting block; 201112. Snap-fit ​​block; 2012. Through hole; 202. Protective Part; 2021. Snap-fit ​​Hole; 202111. First Snap-fit ​​Hole; 202112. Second Snap-fit ​​Hole; 202113. Guide Angle; 2022. Snap-fit ​​Protrusion; 2023. Protective Cavity; 2024. Notch; 2025. Connecting Ear; 20251. Hole Hole; 20252. Notch; 203. Connecting bar; 2031. First part; 2032. Second part; 3. Pole post; 4. Polar ears; 5. Pole group; K, Glue Reduction Groove. Detailed Implementation

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

[0028] In the description of this application, 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 used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. 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.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] In current battery manufacturing technology, the tabs 4 typically exhibit significant morphological dispersion after the bending process. The bending angle, extension direction, and spatial position of different tabs 4 vary considerably, leading to a disordered and unstructured internal battery layout. This morphological variation not only occupies a large amount of redundant space, making it difficult to maximize battery space utilization, but also causes displacement during battery assembly, transportation, and charging / discharging due to the loose distribution of the tabs 4. This displacement can lead to abnormal contact between the tabs 4 and other components, potentially resulting in internal short circuits within the battery.

[0032] Therefore, an embodiment of the first aspect of this application provides a cover assembly applied to a battery casing, combined with Figures 1 to 14 As shown, the device includes a cover plate 1 through which the pole post 3 passes, and a lower plastic part 2 disposed on the cover plate 1. The cover plate 1 is elongated, and the lower plastic part 2 has a main body portion 201 that conforms to the shape of the cover plate 1, and protective portions 202 disposed at both ends of the main body portion 201 along its length. A snap-fit ​​portion is provided between the protective portion 202 and the main body portion 201.

[0033] The pole post 3 is used to connect with the pole tab 4 of the pole group 5. Each protective part 202 can be bent relative to the main body part 201 and connected to the main body part 201 through the snap-fit ​​part. After snap-fit, the protective part 202 abuts against the side of the pole tab 4 at the corresponding end that is away from the cover plate 1.

[0034] Therefore, by providing protective portions 202 at both ends of the main body along its length on the lower plastic 2, and by providing snap-fit ​​portions between the protective portions 202 and the main body 201, the insulation coverage can be further expanded, improving battery insulation safety. Furthermore, the protective portions 202, connected to the main body 201 via the snap-fit ​​portions, exert pressure on the tabs 4, thereby fixing the shape and position of the tabs 4 and effectively preventing short circuit risks caused by tab displacement or abnormal contact. Simultaneously, the restraining effect of the protective portions 202 on the tabs 4 also prevents them from scattering or falling, reducing their footprint in the internal space and improving battery space utilization.

[0035] 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 plate assembly, in addition to the aforementioned cover plate 1, pole post 3, and lower plastic 2, typically also includes an upper plastic liner disposed between the pole post 3 and the other side of the cover plate 1, and a sealing element disposed between the cover plate 1 and the pole post 3. Furthermore, the specific structure of the pole post 3, the installation method of the pole post 3 and the lower plastic liner 2 on the cover plate 1, and the structure of the upper plastic liner and the sealing element can all refer to existing structures; this embodiment does not make any improvements in these aspects.

[0036] Moreover, generally speaking, such as Figure 1 As shown, the terminals 3 are generally two spaced apart along the length of the cover plate 1. The tabs 4 and the protective portion 202 on the electrode assembly 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 lower plastic 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 lower plastic 2. Furthermore, the lower plastic 2 can be made of the insulating material commonly used in existing batteries, and no specific limitation is made here.

[0037] In some of the exemplary implementations, combined with Figure 1 , Figure 4 and Figure 8 As shown, the main body 201 and the protective part 202 are integrally formed. The main body 201 has a plate and a connecting rib 203 protruding to one side of the plate. The connecting rib 203 is connected to the protective part 202, and a glue-reducing groove K is provided at the connection between the two. Here, by integrally forming the main body 201 and the protective part 202, the complex process and assembly errors caused by assembling multiple parts are avoided, the connection process and the number of parts are reduced, and the manufacturing of the cover plate assembly can be made more efficient.

[0038] By providing a reducing groove K at the connection between the connecting rib 203 and the protective part 202, the connection between the connecting rib 203 and the protective part 202 can have a certain degree of flexibility. When the protective part 202 is bent relative to the main body 201, the reducing groove K can provide a certain deformation space for the connection. This effectively avoids bending difficulties or damage to the connection due to excessive rigidity, making the bending operation of the protective part 202 smoother, while ensuring a stable contact effect between the protective part 202 and the tab 4 after snap-fit.

[0039] In specific implementation, combined with Figure 3 and Figure 4As 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 main body 201 along its length. The two electrode groups 5 can be simultaneously connected to the tabs 4 of the two electrode groups 5, meaning it can be used in a dual-cell battery. Meanwhile, two protective parts 202 are located at both ends of the main 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 protective part 202 is generally rectangular to provide a larger contact area with the tabs 4, thereby further improving the fixing effect of the tabs 4.

[0040] Furthermore, the connecting rib 203 is located at the middle of the protective portion 202 along its length and extends along the length of the protective portion 202, thereby enabling the protective portion 202 and the main body portion 201 to have good connection strength. Additionally, the adhesive-reducing groove K extends through the connecting rib 203 along its length, facilitating the bending of the protective portion 202 relative to the main body portion 201. For example, Figure 7 As shown, the connecting rib 203 includes a first portion 2031 disposed on the main body portion 201, and a second portion 2032 extending to one side of the first portion 2031. The aforementioned adhesive-reducing groove K is specifically disposed on the second portion 2032. Furthermore, the second portion 2032 is disposed at the end of the first portion 2031 away from the main body portion 201, and is a plate-like structure of uniform thickness extending outward from the main body portion 201 to connect with the protective portion 202, while also facilitating bending.

[0041] In some of the exemplary implementations, combined with Figure 3 After and Figure 4 As shown, the snap-fit ​​portion includes a snap fastener 2011 on the main body portion 201 and a snap-fit ​​hole 2021 on the protective portion 202. Since the main body portion 201 is located on one side of the cover plate 1, the snap-fit ​​portion includes the snap fastener 2011 on the main body portion 201 and the snap-fit ​​hole 2021 on the protective portion. Therefore, after the protective portion and the main body portion 201 are snapped together, the snap fastener 2011 can be exposed on the outside, making it easy to operate the snap fastener 2011 to separate the protective portion from the main body portion 201, facilitating later maintenance and assembly.

[0042] In practice, such as Figure 3 and Figure 4As shown, the snap-fit ​​hole 2021 is located at the end of the protective portion 202 away from the connecting portion 203. This design prevents the end of the protective portion 202 away from the connecting portion 203 from warping, thereby ensuring the fixing effect of the electrode tab 44. In addition, a snap-fit ​​hole 2021 is provided only in the middle of the protective portion 202 along its length, and the buckles 2011 and 2011 are provided in a one-to-one correspondence with the snap-fit ​​holes 2021 and 2021.

[0043] It should be noted that, in addition to placing the buckle 2011 on the main body 201 and the snap-fit ​​hole 2021 on the protective part 202, the buckle 2011 can also be placed on the protective part 202 and the snap-fit ​​hole 2021 on the main body 201. Furthermore, the number of snap-fit ​​holes 2021 is not limited to the one shown in the figure; their position and number can be adjusted according to design requirements.

[0044] In some of the exemplary implementations, combined with Figure 4 and Figure 14 As shown, the protective part 202 is provided with a snap-fit ​​protrusion 2022 protruding towards the main body part 201. The snap-fit ​​hole 2021 is provided at the snap-fit ​​protrusion 2022 and penetrates the protective part 202. After snapping, the protective part 202 abuts against the main body part 201 through the snap-fit ​​protrusion 2022.

[0045] By providing a snap-fit ​​protrusion 2022 on the protective part 202 and setting a snap-fit ​​hole 2021 at the snap-fit ​​protrusion 2022, the protective part 202, after snapping, abuts against the main body part 201 through the snap-fit ​​protrusion 2022. This not only improves the structural strength at the snap-fit ​​hole 2021, ensuring the snap-fit ​​strength between the protective part 202 and the main body part 201, but also enhances the firmness of the protective part 202 through the abutment between the snap-fit ​​protrusion 2022 and the main body part 201, thereby improving the fixing effect on the electrode tab 4.

[0046] In specific implementation, combined with Figure 4 and Figure 14 As shown, the snap-fit ​​protrusion 2022 is, for example, set to a cylindrical shape. Of course, in addition to setting the snap-fit ​​protrusion 2022 to a cylindrical shape, it is also possible to set it to a rectangular or irregular shape.

[0047] In some of the exemplary implementations, such as Figure 14As shown, the protrusion height of the connecting rib 203 is the same as the protrusion height of the snap-fit ​​protrusion 2022. This arrangement ensures that after snap-fitting, the supporting forces on both ends of the protective part 202 (the connection point of the connecting rib 203 and the contact point of the snap-fit ​​protrusion 2022) are on the same plane, preventing the protective part 202 from tilting or twisting due to height differences. This effectively disperses the force exerted by the protective part 202 on the electrode tab 4, preventing the connecting rib 203 or the snap-fit ​​protrusion 2022 from being broken due to excessive local stress. It also ensures the uniformity of force on all parts of the electrode tab 4, effectively preventing the electrode tab 4 from warping or bending excessively due to height differences, and improving the consistency of the electrode tab 4's condition.

[0048] In some exemplary embodiments, the snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap-fit ​​hole 2021. Each sub-snap fastener 20111 has a connecting block 201111 connected to the main body portion 201, and a snap-fit ​​block 201112 protruding radially outward from the connecting block 201111 along the snap fastener 2011. The snap fastener 2011 is snapped onto the protective portion 202 by the snap-fit ​​block 201112.

[0049] 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.

[0050] In specific implementation, combined with Figure 6 As shown, four sub-clamps 20111 are evenly distributed circumferentially along the snap-fit ​​hole 2021, and both the snap-fit ​​block 201112 and the connecting block 201111 are fan-shaped. This design can evenly distribute the external force on the protective part 202 to the main body 201, avoiding local stress concentration. Compared to a smaller number of sub-clamps 20111, the four sub-clamps 20111 form a stable support structure. When the electrode tab 44 is subjected to force and shifts, each sub-clamp 20111 can jointly provide a reaction force, effectively suppressing the loosening or deformation of the protective part 202, thereby enhancing the overall strength and reliability of the snap-fit ​​structure and reducing the risk of the electrode tab 4 being inserted backwards.

[0051] 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.

[0052] 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 to each other, wherein the diameter of the first snap-fit ​​hole 202111 is smaller than the diameter of the second snap-fit ​​hole 202112. Furthermore, the connecting block 201111 is inserted into the first snap-fit ​​hole 202111, and the snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112, with one end of the snap-fit ​​block 201112 recessed relative to the protective portion 202.

[0053] By making the snap-fit ​​hole 2021 include a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112, and the diameter of the first snap-fit ​​hole 202111 is smaller than that of the second snap-fit ​​hole 202112, the connecting block 201111 can play a preliminary positioning role after being inserted into the first snap-fit ​​hole 202111. When the snap-fit ​​block 201112 is engaged in the second snap-fit ​​hole 202112, a radial limit is formed, thereby effectively preventing the buckle 2011 from disengaging axially or radially. Furthermore, 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 protective part and the main body part 201.

[0054] In specific implementation, combined with Figure 3 and Figure 8 As shown, the end of the first snap-fit ​​hole 202111 away from the second snap-fit ​​hole 202112 is provided with a guide slope 202113, which is used to guide the snap-fit ​​2011 into the snap-fit ​​hole 2021. This reduces the difficulty of aligning the snap-fit ​​2011 with the snap-fit ​​hole 2021, facilitating the quick insertion of the snap-fit ​​2011 into the snap-fit ​​hole 2021, thereby improving assembly efficiency. Simultaneously, the free ends of each snap-fit ​​20111 are chamfered to further facilitate their insertion into the snap-fit ​​hole 2021, further improving snap-fit ​​efficiency.

[0055] In some of the exemplary implementations, such as Figure 6 As shown, the distance 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 connection through moderate elastic deformation, ensuring a secure connection and preventing loosening. In practical implementation, 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.

[0056] In some of the exemplary implementations, such as Figure 14As shown, the engagement length W1 between each snap-fit ​​block 201112 and the protective part 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 protective part 202 is between 0.25mm² and 1.5mm². Setting the engagement length W1 between each snap-fit ​​block 201112 and the protective part 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.

[0057] The engagement area between each snap-fit ​​block 201112 and the protective part 202 is between 0.25mm2 and 1.5mm2. This ensures that the snap-fit ​​block 201112 and the snap-fit ​​hole 2021 fit tightly together, and effectively avoids material deformation or wear caused by excessive compression, thereby improving the long-term stability of the snap-fit ​​structure.

[0058] In specific implementation, such as Figure 14 As shown, for example, the engagement length W1 of the snap-fit ​​block 201112 and the protective part 202 in the radial direction of the snap-fit ​​hole 20212021 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 protective part 202 can be set to 0.25mm², 0.5mm², 0.8mm², 1.0mm², 1.2mm², 1.5mm², or other values.

[0059] In some of the exemplary implementations, such as Figure 14 As shown, the radius W2 of each connecting block 201111 is between 0.4mm and 1.2mm. This ensures that the connecting block 201111 has sufficient cross-sectional area to distribute the clamping force while avoiding excessive impact on the strength of the main body 201, ensuring a secure connection between the buckle 20111 and the main body 201, and preventing the protective part 202 from loosening. In specific implementations, for example, the radius W2 of each connecting block 201111 can be set to 0.4mm, 0.7mm, 1.0mm, 1.2mm, or other values.

[0060] In some exemplary embodiments, the depth h of the first locking hole 202111 is between 0.55mm and 2.8mm, and the height H of the connecting block 201111 is between 0.8mm and 2.8mm. This arrangement allows the connecting block 201111 to undergo moderate elastic deformation after insertion, providing a durable locking force. This helps ensure a tight engagement between the protective part 202 and the main body 201, preventing the tab 4 from shifting under conditions such as battery vibration, charging and discharging expansion, and reducing the risk of short circuits. If H is too short or h is too deep, the connecting block 201111 cannot be fully engaged and is prone to loosening; conversely, excessive insertion resistance may damage the latch 2011.

[0061] In specific implementation, such as Figure 8 As shown, for example, the depth h of the first card hole 202111 can be set to 0.55mm, 1.0mm, 1.5mm, 2.0mm, 2.8mm or other values. For example, the height H of the connecting block 201111 can be set to 0.8mm, 1.2mm, 1.6mm, 1.8mm or other values.

[0062] In some exemplary embodiments, the diameter D of the first locking hole 202111 is between 1.6mm and 3.0mm. This configuration effectively ensures that the connecting block 201111 and the first locking hole 202111 form a suitable interference fit, preventing the locking buckle 20111 from being too tight, causing material fatigue, or too loose, causing the protective part 202 to wobble, thus stably fixing the electrode tab 4 and avoiding the risk of short circuits. In specific implementations, such as... Figure 8 As shown, for example, the diameter D of the first card hole 202111 can be set to 1.6mm, 2.0mm, 2.5mm, 3.0mm or other values.

[0063] In some embodiments, combined Figures 15 to 18 As shown, corresponding to the through hole 2012 on the main body 201, a protective cavity 2023 with an open end is further formed on each protective part 202. Furthermore, the protective cavity 2023 is recessed to the side away from the main body 201, which can better accommodate the welding slag at the welding position of the tab 4, thereby reducing the risk of welding slag puncturing the separator and causing a short circuit in the battery, and improving the safety performance of the battery.

[0064] In some exemplary embodiments, a notch 2024 is provided on the protective portion 202 at the edge of the opening end of the protective cavity 2023, and this notch 2024 is used 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.

[0065] 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 protective part of the electrode tab 4 after bending and the electrode group 5, thereby creating a certain gap between the protective cavity 2023 and the electrode group 5.

[0066] 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 protective portion of the tab 4 after bending 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 risks 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.

[0067] It is worth noting that, regarding this embodiment, based on the above exemplary implementations, in specific implementation, as a preferred embodiment, it is still... Figures 1 to 14 As shown, the lower plastic 2 includes a main body 201 and a protective part 202, which are integrally formed. The main body 201 has a plate and a connecting rib 203 protruding to one side of the plate. The connecting rib 203 is connected to the protective part 202, and a reducing groove K is provided at the connection between the two.

[0068] The snap-fit ​​part includes a snap fastener 2011 provided on the main body 201 and a snap-fit ​​hole 2021 provided on the protective part 202. The snap fastener 2011 includes a plurality of sub-snap fasteners 20111 arranged circumferentially along the snap-fit ​​hole 2021. Each sub-snap fastener 20111 has a connecting block 201111 connected to the main body 201 and a snap-fit ​​block 201112 protruding radially outward from the connecting block 201111. The snap fastener 2011 is snapped onto the protective part 202 by the snap-fit ​​block 201112.

[0069] The snap-fit ​​hole 2021 includes a first snap-fit ​​hole 202111 and a second snap-fit ​​hole 202112 that are connected to each other. The diameter of the first snap-fit ​​hole 202111 is smaller than the diameter of the second snap-fit ​​hole 202112. The connecting block 201111 is inserted into the first snap-fit ​​hole 202111, and the snap-fit ​​block 201112 is snapped into the second snap-fit ​​hole 202112. The end of the snap-fit ​​block 201112 away from the connecting block 201111 is recessed relative to the protective part 202.

[0070] In the preferred embodiment of the cover plate assembly above, the specific settings and arrangements of each structure in the lower plastic 2 can still be found in the descriptions of the above exemplary embodiments, and the beneficial effects brought about by its design can also be found in the descriptions of the above exemplary embodiments.

[0071] A second aspect of this application also provides a cover plate assembly, combined with... Figures 19 to 23 As shown, its overall structure is the same as the cover plate assembly in the above embodiment, except that the protective part 202 includes a protective plate for abutting the electrode tab 4, and a connecting ear 2025 connected to the main body part 201. The connecting ear 2025 protrudes to one side of the protective plate, and has a hollow hole 20251 arranged along its length direction on the connecting ear 2025, and the main body part 201 has notches 20252 located on both sides of the connecting ear 2025 along its length direction.

[0072] By protruding the connecting ear 2025 of the protective part 202 towards one side of the protective plate, and providing a perforated hole 20251 along the length direction on the connecting ear 2025, the weight of the protective part 202 is reduced while its strength and toughness are enhanced. The design of the connecting ear 2025, the perforated hole 20251, and the notch 20252 facilitates bending and snapping of the protective part 202 relative to the main body 201. During installation, operators can more easily bend the protective part 202 and snap it into place with the main body 201.

[0073] In specific implementation, such as Figure 21 As shown, for example, the connecting ear 2025 is located in the middle of the length direction of the protective plate, and the notch 20252 is also located in the middle of the connecting ear 2025, and is designed as a long strip extending along the length direction of the connecting ear 2025. This ensures the connection strength between the protective part 202 and the main body 201 while significantly increasing the toughness of the connecting ear 2025, facilitating bending of the protective part 202 relative to the main body 201. It should be noted that, in addition to designing the perforation 20251 as a single long strip, it can also be designed as multiple perforations spaced apart along the length direction of the connecting ear 2025.

[0074] The cover assembly of this embodiment enables the protective part 202 to restrain the tab 4, and also prevents the tab 4 from spreading out or falling down at will. It can reduce the space occupied by the tab 4 and improve the space utilization of the battery. It can also prevent the tab 4 from being inserted upside down and causing a short circuit. Therefore, it can also improve the safety of the battery.

[0075] In addition, this embodiment also relates to a battery, the battery casing of which is provided with a cover plate assembly as described above.

[0076] The battery in this embodiment, by setting the cover assembly as described above, can have better safety and better space utilization.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly applied to a battery casing, characterized in that: Includes a cover plate through which the pole is inserted, and a lower plastic material disposed on the cover plate; The cover plate is elongated, and the lower plastic has a main body portion that conforms to the shape of the cover plate, and protective portions at both ends of the main body portion along its length, with a snap-fit ​​portion between the protective portions and the main body portion; The pole post is used to connect with the pole lugs of the pole group. Each of the protective parts can be bent relative to the main body and connected to the main body through the snap-fit ​​part. After snapping, the protective part abuts against the side of the pole lug at the corresponding end that is away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The main body and the protective part are integrally formed. The protective part includes a protective plate for abutting the electrode tab and a connecting ear connected to the main body. The connecting ear protrudes to one side of the protective plate and has a hollow hole along its length. The main body has notches on both sides of the connecting ear along its length.

3. The cover plate assembly according to claim 1, characterized in that: The main body and the protective part are integrally formed. The main body has a plate and a connecting rib protruding to one side of the plate. The connecting rib is connected to the protective part, and a glue-reducing groove is provided at the connection between the two.

4. The cover plate assembly according to claim 2 or 3, characterized in that: The snap-fit ​​portion includes a buckle provided on the main body portion and a snap-fit ​​hole provided on the protective portion.

5. The cover plate assembly according to claim 4, characterized in that: The protective part is provided with a snap-fit ​​protrusion protruding towards one side of the main body part, and the snap-fit ​​hole is provided at the snap-fit ​​protrusion and penetrates the protective part; After being snapped in, the protective portion abuts against the main body portion via the snap-in protrusion.

6. The cover plate assembly according to claim 5, characterized in that: The protrusion height of the connecting rib is the same as the protrusion height of the snap-fit ​​protrusion.

7. 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 main 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.

8. The cover plate assembly according to claim 7, 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, the snap-fit ​​block is snapped into the second card hole, and the end of the snap-fit ​​block away from the connecting block is recessed relative to the protective part.

9. The cover plate assembly according to claim 8, characterized in that: The depth h of the first card hole is between 0.55mm and 2.8mm, and the height H of the connecting block is between 0.8mm and 2.8mm; and / or, The engagement length W1 of each of the snap-fit ​​blocks and the protective part in the radial direction of the snap-fit ​​hole is between 0.35mm and 0.65mm.

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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