Cover plate assembly and battery

Abstract

The invention relates to the technical field of power batteries, and provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate provided with a pole in a penetrating mode and lower plastic arranged on the cover plate. The lower plastic cement is provided with a main body and a protection body, and the protection body can be folded relative to the main body to abut against the side, back to the pole column, of the pole lug and is connected with the main body through a connecting part. According to the cover plate assembly, through the arrangement of the lower plastic cement, the protection body on the lower plastic cement can be turned over to abut against the side face, facing the pole group, of the pole lug, so that the protection body forms physical isolation on the pole lug and the pole group. And meanwhile, the main body on the cover plate is connected with the protective body through the connecting part, so that the tabs are clamped between the protective body and the cover plate, the shapes and the positions of the tabs are fixed, the short circuit of the battery caused by abnormal contact between the tabs and between the tabs and the pole group is prevented, and the safety of the battery is improved.

Description

Technical Field

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

[0002] In the field of battery manufacturing, the cover plate assembly is a key component of the battery casing, and its structural design directly affects the safety and stability of the battery. Generally, the cover plate has terminals for connecting the internal electrode assembly of the battery, and the internal electrode assembly is welded to the terminals via tabs.

[0003] Currently, after the electrode tabs and cover plates are welded together, the electrode tabs are often of varying shapes and quite scattered. This results in the electrode tabs being loosely positioned inside the battery during subsequent assembly, easily causing abnormal contact between different electrode tabs and between the electrode tabs and the electrode assembly, leading to short circuits in the electrode assembly. This not only affects the battery's charge and discharge performance and lifespan but also poses serious safety hazards. Summary of the Invention

[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 includes a cover plate through which an electrode post passes, and a lower plastic disposed on the cover plate; The cover plate is elongated, and the poles are multiple poles spaced apart along the length of the cover plate and used to connect with the pole lugs of the pole group. The lower plastic has a main body conforming to the shape of the cover plate and a protective body provided on one side of the length of the main body. A connecting part is provided between the protective body and the main body. The protective body can be folded relative to the main body and connected to the main body through the connecting part. After connection, the protective body is placed on one side of the plurality of pole posts and abuts against the side of the pole tab opposite to the pole post.

[0006] Furthermore, a hollow area is provided in the middle of the main body along its length, and the protective body includes a first abutting part, a protective part, and a second abutting part arranged sequentially along the direction away from the main body. The protective part is provided corresponding to the hollow area. The first abutting part and the second abutting part abut against the tabs on the pole posts at both ends, and the connecting part is provided between the main body and the first abutting part and the second abutting part.

[0007] Furthermore, the connecting part includes a buckle provided on the main body and a snap-fit ​​hole provided on the protective body; the buckle includes a plurality of sub-buckles spaced apart 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 along the buckle, the buckle being snapped onto the protective body by the snap-fit ​​block.

[0008] Furthermore, the first abutting portion has a snap-fit ​​hole at one end away from the main body, and the snap-fit ​​hole is a plurality of such holes spaced apart on the first abutting portion along the width direction of the protective body; and / or, the second abutting portion has a snap-fit ​​hole at both ends, and the snap-fit ​​hole is a plurality of such holes spaced apart on the second abutting portion along the width direction of the protective body.

[0009] Furthermore, the snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected to each other, the diameter of the first snap-fit ​​hole is smaller than the diameter of the second snap-fit ​​hole; the connecting block is inserted into the first snap-fit ​​hole, the snap-fit ​​block is snapped into the second snap-fit ​​hole, and the end of the snap-fit ​​block away from the connecting block is recessed or flush with the protective body.

[0010] Furthermore, the distance W between two adjacent snap fasteners and the snap-fit ​​length W1 of each snap-fit ​​block and the protective body in the radial direction of the snap-fit ​​hole satisfy the following: W≥2W1; and / or, the thickness of each snap-fit ​​block in the axial direction of the snap-fit ​​hole is between 0.6mm and 4.5mm.

[0011] Furthermore, the protective body is provided with a snap-fit ​​protrusion protruding towards one side of the main body, and the snap-fit ​​hole is provided at the snap-fit ​​protrusion and penetrates the protective body; after snapping, the protective body abuts against the main body through the snap-fit ​​protrusion.

[0012] Furthermore, the protective portion protrudes to the side away from the main body and forms a groove, with a vent hole on the bottom wall of the groove.

[0013] Furthermore, the main body and the protective body 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 body and has a glue-reducing groove.

[0014] Compared with related technologies, this application has the following advantages: (1) The cover assembly described in this application, through the setting of the lower plastic, allows the protective body on the lower plastic to fold towards the side of the cover where the electrode post and the electrode tab are connected, and to abut against the side of the electrode tab facing the electrode assembly, so that the protective body constitutes a physical isolation between the electrode tab and the electrode assembly. At the same time, the connecting part connects the main body on the cover to the protective body, so that the electrode tab is clamped between the protective body and the cover, thereby fixing the shape and position of the electrode tab, preventing abnormal contact between the electrode tabs and between the electrode tab and the electrode assembly, which could lead to a short circuit in the battery, thereby improving the safety of the battery.

[0015] (2) The hollowed-out area provides sufficient installation space for the explosion-proof valve on the cover plate, preventing the main body from obstructing the area where the explosion-proof valve is located and affecting its normal operation, thus ensuring the overall safety of the battery. At the same time, by setting the first and second abutting parts, the first and second abutting parts can abut against different tabs respectively, and are connected to the main body through the connecting part, increasing the connection points between the protective body and the main body, and further enhancing the fixing effect of the protective body on the tabs.

[0016] (3) By setting a buckle with multiple sub-buckles and a snap-fit ​​hole that mates with the buckle, the snap-fit ​​hole can push against the snap-fit ​​block of each sub-buckle, causing the connecting block of each sub-buckle to bend and converge towards the center of the snap-fit ​​hole and insert into the snap-fit ​​hole. Subsequently, the snap-fit ​​block on each sub-buckle can hook into the snap-fit ​​hole, realizing the engagement of the buckle and the snap-fit ​​hole. The simultaneous connection of multiple sub-buckles with the snap-fit ​​hole can prevent the connection from failing due to the breakage of a single buckle, thus having better reliability. At the same time, compared with the setting of a single buckle, it can reduce the operating force required for the connection part to a certain extent. Furthermore, the multiple sub-buckles are set along the circumference of the snap-fit ​​hole, which can guide the buckle to align with the center of the snap-fit ​​hole in all directions, so as to facilitate the snap-fit ​​operation.

[0017] (4) Since the first abutting part is directly connected to the main body through the fold, the snap-fit ​​hole is set at the end of the first abutting part away from the main body, so that the main body can achieve the connection and fixation of the first abutting part through the fold on one side and the connecting part on the other side, ensuring the fixing effect of the first abutting part on the electrode tab. At the same time, by providing snap-fit ​​holes at both ends of the second abutting part, the two ends of the second abutting part are fixed, ensuring the fixing effect of the second part on the electrode tab. Furthermore, multiple snap-fit ​​holes are provided and arranged along the width direction of the protective body, which not only increases the connection points between the protective body and the main body and improves the connection effect between the protective body and the main body, but also increases the abutting area between the protective body and the electrode tab in the width direction to a certain extent, further improving the fixing effect on the electrode tab, so as to prevent the electrode tab from coming out between the protective body and the main body.

[0018] (5) The first and second locking holes provide initial positioning after the connecting block is inserted into the first locking hole, and radial limiting when the locking block is engaged in the second locking hole, effectively preventing the buckle from coming out axially or radially. Setting the second locking hole to a larger diameter provides more engagement space for the locking block, increasing the contact area between the two and thus improving the engagement strength between the protective part and the main body. Simultaneously, the locking block's recessed or flush design relative to the protective body prevents the buckle from protruding into the battery, avoiding collisions between the protruding buckle and the electrode assembly, thus ensuring the battery's performance and safety.

[0019] (6) By setting the dimensional relationship between the spacing between two adjacent sub-snap fasteners and the snap-fit ​​length of the snap-fit ​​block, sufficient space is provided between the two adjacent sub-snap fasteners for the connecting block, that is, space for the sub-snap fasteners to bend towards the center of the snap-fit ​​hole, so that each sub-snap fastener can retract into the snap-fit ​​hole to ensure that the fastener can be smoothly inserted into or disengaged from the snap-fit ​​hole. At the same time, the thickness of the snap-fit ​​block helps to ensure that the snap-fit ​​block maintains rigidity when subjected to the pressure of the tab, ensuring the structural strength of the fastener, and avoiding the disadvantage of lightweight design due to excessive thickness.

[0020] (7) Due to the thinness of the protective body, the snap-fit ​​protrusion serves as a reinforcing structure and a basis for the snap-fit ​​hole. This improves the structural strength around the snap-fit ​​hole and prevents damage to the surrounding structure due to the pull of the snap fastener, which could lead to an enlarged hole diameter and failure of the connection between the snap fastener and the snap-fit ​​hole. This enhances the connection strength and reliability between the snap fastener and the snap-fit ​​hole. Simultaneously, the snap-fit ​​protrusion abuts against the main body, creating a fixed area between the main body and the protective body for the electrode tab to pass through. This facilitates clamping the electrode tab between the protective body and the main body, ensuring the effective fixation of the electrode tab while preventing it from being damaged by excessive pressure.

[0021] (8) By setting the groove and the vent hole, the groove can avoid the area of ​​the explosion-proof valve on the cover plate, and provide a certain installation space for the explosion-proof valve on the side of the cover plate facing the electrode group. At the same time, when the battery experiences thermal runaway and the electrode group generates a large amount of gas, the gas can pass through the vent hole and be discharged through the explosion-proof valve to prevent the protective body from affecting the discharge of gas, thereby further ensuring the safety of the battery.

[0022] (9) Molding the main body and the protective body as a single unit can improve the overall production efficiency of the lower plastic and cover plate components. At the same time, by setting connecting ribs, the strength and rigidity of the connection between the main body and the protective body can be enhanced while realizing the folding of the protective body. The setting of the rubber reduction groove makes the connection between the connecting rib and the protective body have a certain degree of flexibility, and when the protective body is folded relative to the main body, the rubber reduction groove can provide a certain deformation space for the connection, avoiding folding difficulties or damage to the connection due to excessive rigidity.

[0023] This application also proposes a battery in which the casing is provided with a cover assembly as described above.

[0024] The battery and / or cover plate assembly described in this application have the same technical effects as related technologies, and will not be described in detail here. 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 structure of the cover plate assembly on the other side of the embodiment described in this application; Figure 3 for Figure 2 Enlarged view of point B in the middle; Figure 4 for Figure 1 Sectional view at position AA Figure 5 for Figure 4 A magnified view of the position shown in C. Figure 6 for Figure 4 A magnified view of the location shown in D; Figure 7 for Figure 4 A magnified view of the location shown in E; Figure 8 This is a schematic diagram showing the connection between the pole post and the pole lug of the cover plate in the embodiments of this application; Figure 9 This is a schematic diagram showing the connection between the cover plate assembly and the pole group according to an embodiment of this application; Figure 10 for Figure 9 A cross-sectional view at the position shown in FF; Figure 11 for Figure 10 A magnified view of the location indicated by G in the middle; Figure 12 for Figure 10 A magnified view of the position indicated by H in the middle; Figure 13 This is a schematic diagram showing the connection between the cover plate assembly and the two adjacent pole groups described in the embodiments of this application; Figure 14 for Figure 13 A sectional view at position II; Figure 15This is a schematic diagram of the structure of a cover plate assembly according to another embodiment of the present application. Figure 16 for Figure 15 Enlarged view of point J in the middle; Figure 17 This is a schematic diagram showing the connection between the cover plate assembly and the pole group in another embodiment of the present application. Figure 18 This is a schematic diagram showing the connection between the cover plate assembly and the two adjacent pole groups in another embodiment of the present application. Figure 19 for Figure 18 A cross-sectional view at the location shown in KK; Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Pole post; 2. Lower plastic; 201. Main body; 2011. Hollowed-out area; 202. Protective body; 2021. First abutting part; 2022. Protective part; 2023. Second abutting part; 2024. Groove; 2025. Vent hole; 203. Snap-fit ​​protrusion; 204. Connecting rib; 2041. Reduction groove; 205. Protective cavity; 2051. Notch; 3. Electrode assembly; 301. Electrode tab; 4. Buckle; 401. Sub-buckle; 4011. Connecting block; 4012. Snap-fit ​​block; 4013. Assembly guide angle; 4014. Disassembly guide angle; 5. Snap-fit ​​hole; 501. First snap-fit ​​hole; 502. Second snap-fit ​​hole. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

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

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

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

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a cover assembly applied to a battery casing.

[0033] In related technologies, the terminal posts 101 on the cover plate 1 are welded to the tabs 301 of the electrode assembly 3 inside the battery casing. After the tabs 301 and the terminal posts 101 on the cover plate 1 are welded, the tabs 301 are usually of different shapes and relatively scattered. This can easily lead to abnormal contact between different tabs 301 and between the tabs 301 and the electrode assembly 3 during subsequent assembly, resulting in a short circuit in the electrode assembly 3. Ultimately, this affects the battery's charge and discharge performance and lifespan, and also poses a serious safety hazard.

[0034] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figure 1 , Figure 2 and Figure 8 As shown, the overall design includes a cover plate 1 through which the pole post 101 passes, and a lower plastic 2 disposed on the cover plate 1.

[0035] The cover plate 1 is elongated, and multiple pole posts 101 are spaced apart along the length of the cover plate 1, used to connect with the pole tabs 301 of the pole assembly 3. The lower plastic 2 has a main body 201 conforming to the shape of the cover plate 1, and a protective body 202 located on one side of the main body 201 along its length. A connecting portion is provided between the protective body 202 and the main body 201. (Continue combining...) Figure 9 , Figure 10 , Figure 13 , Figure 14 As shown, the protective body 202 can be folded relative to the main body 201 and connected to the main body 201 through the connecting part. After connection, the protective body 202 blocks one side of the multiple pole posts 101 and abuts against the side of the pole tab 301 opposite to the pole post 101.

[0036] Therefore, through the setting of the lower plastic 2, the protective body 202 on the lower plastic 2 can be folded towards the side of the cover plate 1 where the terminal post 101 and the tab 301 are connected, and abut against the side of the tab 301 facing the electrode group 3, so that the protective body 202 constitutes a physical isolation between the tab 301 and the electrode group 3. At the same time, the main body 201 on the cover plate 1 is connected to the protective body 202 by the connecting part, so that the tab 301 is clamped between the protective body 202 and the cover plate 1, thereby fixing the shape and position of the tab 301, preventing abnormal contact between the tabs 301 and between the tab 301 and the electrode group 3, which could lead to a short circuit in the battery, thereby improving the safety of the battery.

[0037] Based on the above overview, specifically, in this embodiment, two pole posts 101 are provided on the cover plate 1, and the two pole posts 101 are respectively located at both ends of the cover plate 1 along its length. In this example, one pole post 101 is simultaneously connected to the same polarity tabs 301 of the two pole groups 3.

[0038] In some of the exemplary implementations, combined with Figure 2 As shown, the main body 201 has a hollow area 2011 in the middle of its length direction, and the protective body 202 includes a first abutting part 2021, a protective part 2022, and a second abutting part 2023 arranged sequentially in a direction away from the main body 201. The protective part 2022 is provided corresponding to the hollow area 2011. The first abutting part 2021 and the second abutting part 2023 respectively abut against the tabs 301 on the two end posts 101, and a connecting part is provided between the main body 201 and the first abutting part 2021 and the second abutting part.

[0039] The hollowed-out area 2011 provides sufficient installation space for the explosion-proof valve on the cover plate 1, preventing the main body 201 from partially obstructing the area where the explosion-proof valve is located and affecting its normal operation, thus ensuring the overall safety of the battery. Simultaneously, the first and second abutting portions 2023 allow them to abut against different tabs 301 respectively, and are connected to the main body 201 via connecting parts. This increases the number of connection points between the protective body 202 and the main body 201, further enhancing the fixing effect of the protective body 202 on the tabs 301.

[0040] Combination Figures 3 to 6 As shown, in some exemplary embodiments, the connecting part includes a buckle 4 provided on the main body 201 and a snap-fit ​​hole 5 provided on the protective body 202. The buckle 4 includes a plurality of sub-buckles 401 arranged circumferentially at intervals along the snap-fit ​​hole 5. Each sub-buckle 401 has a connecting block 4011 connected to the main body 201 and a snap-fit ​​block 4012 protruding radially outward from the connecting block 4011. The buckle 4 is snapped onto the protective body 202 by the snap-fit ​​block 4012.

[0041] By setting a buckle 4 with multiple sub-buckles 401 and a snap-fit ​​hole 5 that mates with the buckle 4, the snap-fit ​​hole 5 can push against the snap-fit ​​blocks 4012 of each sub-buckle 401, causing the connecting blocks 4011 of each sub-buckle 401 to bend and converge towards the center of the snap-fit ​​hole 5 and insert into the snap-fit ​​hole 5. Subsequently, the snap-fit ​​blocks 4012 on each sub-buckle 401 can hook into the snap-fit ​​hole 5, realizing the engagement of the buckle 4 and the snap-fit ​​hole 5. Similarly, when it is necessary to separate the buckle 4 from the snap-fit ​​hole 5, the snap-fit ​​hole 5 can also push against the snap-fit ​​blocks 4012, causing each sub-buckle 401 to converge towards the center and disengage from the snap-fit ​​hole 5.

[0042] Furthermore, the simultaneous connection of multiple individual snap fasteners 401 to the snap-fit ​​hole 5 prevents connection failure due to the breakage of a single snap fastener 4, thus ensuring better reliability. At the same time, compared to a single snap fastener 4, it reduces the operational force required for the connection. Moreover, the multiple snap fasteners 401 arranged circumferentially along the snap-fit ​​hole 5 guide the snap fastener 4 to align with the center of the snap-fit ​​hole 5 in all directions, facilitating the snap-fit ​​operation.

[0043] In specific implementation, the snap-fit ​​block 4012 of this embodiment has an assembly guide angle 4013 on one side along the direction of insertion into the snap-fit ​​hole 5, and a disassembly guide angle 4014 on one side along the direction of removal from the snap-fit ​​hole 5. The arrangement of these two guide angle structures guides the snap-fit ​​block 4012 to bend towards the center of the snap-fit ​​hole 5 when the snap-fit ​​hole 5 pushes against it. This facilitates the connection and disassembly of the snap-fit ​​4 and the snap-fit ​​hole 5. Simultaneously, the length of the assembly guide angle 4013 is greater than the length of the disassembly guide angle 4014. Therefore, while facilitating the connection between the snap-fit ​​4 and the snap-fit ​​hole 5, it also somewhat hinders the separation of the snap-fit ​​4 and the snap-fit ​​hole 5, preventing accidental separation of the snap-fit ​​4 and the snap-fit ​​hole 5 and thus preventing failure of the connection.

[0044] In some exemplary embodiments, the first abutting portion 2021 has a snap-fit ​​hole 5 at the end away from the main body 201, and the snap-fit ​​holes 5 are multiple and spaced apart on the first abutting portion 2021 along the width direction of the protective body 202. Since the first abutting portion 2021 is directly connected to the main body 201 through the fold, and the snap-fit ​​holes 5 are located at the end of the first abutting portion 2021 away from the main body 201, the main body 201 can achieve the connection and fixation of the first abutting portion 2021 through the fold on one side and the connecting part on the other side, thus ensuring the fixing effect of the first abutting portion 2021 on the tab 301.

[0045] In addition, both ends of the second abutment portion 2023 are provided with snap-fit ​​holes 5, and there are multiple snap-fit ​​holes 5 spaced apart along the width direction of the protective body 202 on the second abutment portion 2023. By providing snap-fit ​​holes 5 at both ends of the second abutment portion 2023, the two ends of the second abutment portion 2023 are fixed, ensuring the fixing effect of the second part on the tab 301. On this basis, the snap-fit ​​holes 5 are set to multiple and arranged along the width direction of the protective body 202, which not only increases the connection points between the protective body 202 and the main body 201, improving the connection effect and reliability between the protective body 202 and the main body 201, but also increases the abutment area between the protective body 202 and the tab 301 in the width direction to a certain extent, further improving the fixing effect on the tab 301, so as to prevent the tab 301 from coming out between the protective body 202 and the main body 201.

[0046] In specific implementation, the snap-fit ​​holes 5 on the first abutting part 2021 and the second abutting part 2023 are all set to three along the width direction. Of course, the snap-fit ​​holes 5 can also be set to other numbers, as long as the connection strength between the first and second abutting parts 2023 and the main body 201 can be guaranteed.

[0047] In some exemplary embodiments, the snap-fit ​​hole 5 includes a first snap-fit ​​hole 501 and a second snap-fit ​​hole 502 that are connected to each other, wherein the diameter of the first snap-fit ​​hole 501 is smaller than the diameter of the second snap-fit ​​hole 502. The connecting block 4011 is inserted into the first snap-fit ​​hole 501, and the snap-fit ​​block 4012 is snapped into the second snap-fit ​​hole 502, with the end of the snap-fit ​​block 4012 away from the connecting block 4011 being recessed or flush with the protective body 202.

[0048] With the first locking hole 501 and the second locking hole 502, the connecting block 4011, after being inserted into the first locking hole 501, serves as a preliminary positioning device. Simultaneously, the locking blocks 4012 of the multiple sub-locking buckles 401 are pressed against the wall of the first locking hole 501, causing each sub-locking buckle 401 to be compressed and closed. When the locking blocks 4012 on each sub-locking buckle 401 enter the second locking hole 502, each sub-locking buckle 401 springs back to its initial state, allowing the locking blocks 4012 to hook onto the end faces between the first locking hole 501 and the second locking hole 502, forming a radial limit, thereby effectively preventing the buckle 4 from disengaging axially or radially. Furthermore, setting the second locking hole 502 to a larger diameter provides a larger locking space for the locking blocks 4012, increasing the contact area between them and thus improving the locking firmness between the protective part 2022 and the main body 201.

[0049] Meanwhile, the snap-fit ​​block 4012 is recessed or flush with the protective body 202, which can prevent the snap-fit ​​4 from protruding into the battery and maintain the flatness of the side of the protective body 202 facing the electrode group 3, so as to avoid the protruding snap-fit ​​4 from colliding with the electrode group 3 and causing damage to the electrode group 3, thereby ensuring the battery's performance and safety.

[0050] In specific implementation, the snap-fit ​​block 4012 of this embodiment is recessed relative to the protective body 202 to prevent the snap-fit ​​block 4012, i.e. the buckle 4, from protruding due to processing errors.

[0051] Combination Figure 3 , Figure 11 As shown, in some exemplary embodiments, the distance W between two adjacent snap fasteners 401 satisfies the following condition with respect to the snap length W1 of each snap block 4012 and the protective body 202 in the radial direction of the snap hole 5: W ≥ 2W1.

[0052] Understandably, during the insertion or removal of the snap fastener 4 from the snap-fit ​​hole 5, the snap-fit ​​block 4012 moves radially along the snap-fit ​​hole 5 to avoid it due to the pushing action of the snap-fit ​​hole 5. During this process, the connecting block 4011 also bends due to the movement of the snap-fit ​​block 4012. Clearly, the snap-fit ​​block 4012 on any sub-snap fastener 401 needs to move radially towards the center of the snap-fit ​​hole 5 by a snap-fit ​​length W1 on the protective body 202. Therefore, there should be at least a distance W between two connected sub-snap fasteners 401 for the radial movement of the two snap-fit ​​blocks 4012. Thus, by setting the dimensional relationship between the spacing between two adjacent sub-buckles 401 and the snap-fit ​​length of the snap-fit ​​block 4012, there is sufficient space between two adjacent sub-buckles 401 for the connecting block 4011, that is, for the sub-buckles 401 to bend toward the center of the snap-fit ​​hole 5, so that each sub-buckle 401 can be retracted into the snap-fit ​​hole 5 to ensure that the buckle 4 can be smoothly inserted into or removed from the snap-fit ​​hole 5.

[0053] Furthermore, the thickness of each snap-fit ​​block 4012 in the axial direction of the snap-fit ​​hole 5 is between 0.6mm and 4.5mm. By setting the thickness of the snap-fit ​​block 4012, it is beneficial to ensure that the snap-fit ​​block 4012 maintains rigidity when subjected to the pressure of the tab 301, to ensure the structural strength of the snap-fit ​​4, and to avoid the disadvantage of lightweight design due to excessive thickness.

[0054] In specific implementation, the distance W between two adjacent snap fasteners 401 is (1.2-1.8) mm, preferably 1.2 mm, 1.4 mm, 1.6 mm, or 1.8 mm. Simultaneously, the engagement length W1 between each snap-fit ​​block 4012 and the protective body 202 in the radial direction of the snap-fit ​​hole 5 is (0.35-0.65) mm, preferably 0.35 mm, 0.45 mm, 0.55 mm, or 0.65 mm. Furthermore, the thickness of each snap-fit ​​block 4012 in the axial direction of the snap-fit ​​hole 5 can be 0.6 mm, 1 mm, 2 mm, 3 mm, or 4.5 mm. Of course, other values ​​can also be selected, as long as they meet the structural strength requirements of the snap fasteners 401.

[0055] It is also worth mentioning that, due to the limited size of the buckle 4 and the snap-fit ​​hole 5, if the number of sub-buckles 401 is increased, the size of the sub-buckles 401 will be smaller, which will result in poor structural strength of the sub-buckles 401 and make it difficult to meet the connection strength requirements of the connecting part. Therefore, the buckle 4 in this embodiment has four sub-buckles 401. Compared with the design of two or three sub-buckles 401, the operating force when the buckle 4 engages with the snap-fit ​​hole 5 is smaller, while also taking into account the structural strength of the sub-buckles 401. Of course, other numbers of sub-buckles 401 can also be provided, as long as the connection strength requirements of the connecting part are met.

[0056] In some exemplary embodiments, the protective body 202 is provided with a snap-fit ​​protrusion 203 protruding towards the main body 201, and a snap-fit ​​hole 5 is provided at the snap-fit ​​protrusion 203 and penetrates the protective body 202. After snapping, the protective body 202 abuts against the main body 201 through the snap-fit ​​protrusion 203.

[0057] Because the protective body 202 is thin, when the buckle 4 is pulled out of the snap-fit ​​hole 5, the snap-fit ​​block 4012 easily pulls the edge of the snap-fit ​​hole 5, causing the snap-fit ​​hole 5 to enlarge due to structural damage, resulting in the failure of the connection between the buckle 4 and the snap-fit ​​hole 5.

[0058] Therefore, by setting the snap-fit ​​protrusion 203, the snap-fit ​​protrusion 203 can serve as a reinforcing structure and as the basis for setting the snap-fit ​​hole 5. It can improve the structural strength around the snap-fit ​​hole 5, prevent the surrounding structure of the snap-fit ​​hole 5 from being damaged due to the pulling of the snap fastener 4, and prevent the hole diameter of the snap-fit ​​hole 5 from expanding, thus causing the connection between the snap fastener 4 and the snap-fit ​​hole 5 to fail. This improves the connection strength and reliability between the snap fastener 4 and the snap-fit ​​hole 5.

[0059] Meanwhile, since the tab 301 also has a certain thickness, a snap-fit ​​protrusion 203 is provided to abut against the main body 201, so that the main body 201 and the protective body 202 form a fixed area for the tab 301 to pass through, so that the tab 301 can be clamped between the protective body 202 and the main body 201, ensuring the fixing effect of the tab 301 while preventing the tab 301 from being damaged by excessive pressure.

[0060] In some exemplary embodiments, the protective portion 2022 protrudes to the side away from the main body 201 and forms a groove 2024, with a vent 2025 provided on the bottom wall of the groove 2024.

[0061] With the groove 2024 and the vent 2025, the groove 2024 can avoid the area of ​​the explosion-proof valve on the cover plate 1, and provide a certain installation space for the explosion-proof valve on the side of the cover plate 1 facing the pole group 3.

[0062] Meanwhile, when the battery experiences thermal runaway and causes a large amount of gas to be generated in the electrode group 3, the gas can pass through the vent 2025 and be discharged through the explosion-proof valve to prevent the protective body 202 from affecting the discharge of the gas, thereby further ensuring the safety of the battery.

[0063] In specific implementation, the vent 2025 of this embodiment is an elongated oval structure and is arranged along the length and width of the protective body 202. The protective portion 2022 between adjacent vents 2025 has sufficient width to ensure the structural strength of the protective portion 2022.

[0064] Combination Figure 7 , Figure 12As shown, in some exemplary embodiments, the main body 201 and the protective body 202 are integrally formed. The main body 201 has a plate and a connecting rib 204 protruding to one side of the plate. The connecting rib 204 is connected to the protective body 202, and a glue-reducing groove 2041 is provided on the connecting rib 204.

[0065] Integrating the main body 201 and the protective body 202 into a single unit improves the overall production efficiency of the lower plastic 2 and the cover plate assembly. Simultaneously, by incorporating the connecting rib 204, the strength and rigidity of the connection between the main body 201 and the protective body 202 are enhanced while allowing the protective body 202 to fold. The rubber-reducing groove 2041 provides a degree of flexibility at the connection between the connecting rib 204 and the protective body 202, and provides deformation space at the connection when the protective body 202 folds relative to the main body 201, preventing folding difficulties or damage to the connection due to excessive rigidity.

[0066] Furthermore, in some of the exemplary implementations, combined with Figures 15 to 19 As shown, a recessed protective cavity 205 is provided on the first abutment portion 2021 and the second abutment portion 2023. After the protective body 202 is folded over and connected to the main body 201, the protective cavity 205 protrudes from the protective body 202 toward the electrode assembly 3, and the protective cavity 205 is located below the welding position of the electrode post 101 and the electrode tab 301. Through the provision of the protective cavity 205, the protective cavity 205 can catch the debris and residue generated during welding that falls off the electrode tab 301. This prevents debris and residue from falling between the electrode sheets of the electrode assembly 3 and damaging the electrode sheets, thus ensuring the normal operation of the battery.

[0067] Specifically, both the first abutting portion 2021 and the second abutting portion 2023 are provided with a notch 2051 located at the edge of the opening end of the protective cavity 205, which is used for the flow of electrolyte. The protective cavity 205 is rectangular in shape, and multiple notches 2051 are provided at intervals on each edge of the protective cavity 205.

[0068] Furthermore, the depth of the protective cavity 205 is less than the distance between the protective portion 2022 and the electrode assembly 3 after the tab 301 is bent, thus creating a certain gap between the protective cavity 205 and the electrode assembly 3. Meanwhile, As another implementation, the opening area of ​​the notch 2051 can be enlarged to give the protective cavity 205 a certain degree of elasticity. Furthermore, the depth of the protective cavity 205 can be made equal to the distance between the protective portion 2022 and the electrode assembly 3 after the tab 301 is bent, so that the protective cavity 205 abuts against the electrode assembly 3. Therefore, when the electrode assembly 3 shakes up and down, the protective cavity 205 can buffer the shaking of the electrode assembly 3, achieving the purpose of protecting the electrode assembly 3. This can solve the risk of the tab 301 tearing and puncturing the separator due to the shaking of the electrode assembly 3, further improving the safety performance of the battery.

[0069] 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.

[0070] The cover plate assembly of this embodiment includes a cover plate 1 through which two pole posts 101 pass, and a lower plastic 2 disposed on the cover plate 1.

[0071] The cover plate 1 is elongated, with two pole posts 101 located at opposite ends along its length. Each pole post 101 connects to the same polarity tabs 301 of two pole groups 3. The lower plastic 2 has a main body 201 conforming to the shape of the cover plate 1, and a protective body 202 located on one side of the main body 201 along its length. A connecting portion is provided between the protective body 202 and the main body 201. The protective body 202 can be folded relative to the main body 201 and connected to the main body 201 via the connecting portion. After connection, the protective body 202 blocks one side of the two pole posts 101 and abuts against the side of the tabs 301 facing away from the pole posts 101.

[0072] In addition, the main body 201 has a hollow area 2011 in the middle of its length direction, and the protective body 202 includes a first abutting part 2021, a protective part 2022 and a second abutting part 2023 arranged sequentially in the direction away from the main body 201, with the protective part 2022 corresponding to the hollow area 2011.

[0073] The main body 201 and the protective body 202 are integrally formed. The main body 201 has a plate and a connecting rib 204 protruding to one side of the plate. The connecting rib 204 is connected to the protective body 202 and has a rubber-reducing groove 2041. The protective part 2022 protrudes to the side away from the main body 201 and forms a groove 2024. A vent hole 2025 is provided on the bottom wall of the groove 2024. The vent hole 2025 has an elongated oval structure. The first abutting part 2021 and the second abutting part 2023 respectively abut against the tabs 301 on the two end posts 101, and a connecting part is provided between the main body 201 and the first abutting part 2021 and the second abutting part.

[0074] Specifically, the connecting part includes a buckle 4 on the main body 201 and a snap-fit ​​hole 5 on the protective body 202. The buckle 4 includes a plurality of sub-buckles 401 spaced circumferentially along the snap-fit ​​hole 5. Each sub-buckle 401 has a connecting block 4011 connected to the main body 201 and a snap-fit ​​block 4012 protruding radially outward from the connecting block 4011. The buckle 4 is snapped onto the protective body 202 by the snap-fit ​​block 4012. The snap-fit ​​block 4012 has an assembly guide angle 4013 on one side along the direction of insertion into the snap-fit ​​hole 5 and a disassembly guide angle 4014 on one side along the direction of removal from the snap-fit ​​hole 5. The length of the assembly guide angle 4013 is greater than the length of the disassembly guide angle 4014.

[0075] Furthermore, the snap-fit ​​hole 5 includes a first snap-fit ​​hole 501 and a second snap-fit ​​hole 502 that are connected to each other, with the diameter of the first snap-fit ​​hole 501 being smaller than the diameter of the second snap-fit ​​hole 502. A connecting block 4011 is inserted into the first snap-fit ​​hole 501, and a snap-fit ​​block 4012 is snapped into the second snap-fit ​​hole 502, with the end of the snap-fit ​​block 4012 away from the connecting block 4011 recessed relative to the protective body 202. Simultaneously, the distance W between two adjacent snap-fit ​​blocks 401 is greater than or equal to twice the snap-fit ​​length W1 of the snap-fit ​​block 4012 and the protective body 202 in the radial direction of the snap-fit ​​hole 5. The thickness of each snap-fit ​​block 4012 in the axial direction of the snap-fit ​​hole 5 is between 0.6mm and 4.5mm, and the snap-fit ​​4 has four snap-fit ​​blocks 401.

[0076] In addition, the first abutting portion 2021 has a snap-fit ​​hole 5 at one end away from the main body 201, and the snap-fit ​​hole 5 is three of them spaced apart along the width direction of the protective body 202 on the first abutting portion 2021. Both ends of the second abutting portion 2023 have snap-fit ​​holes 5, and the snap-fit ​​holes 5 are three of them spaced apart along the width direction of the protective body 202 on the second abutting portion 2023. Furthermore, the protective body 202 has a snap-fit ​​protrusion 203 protruding towards one side of the main body 201, and the snap-fit ​​hole 5 is located at the snap-fit ​​protrusion 203 and penetrates through the protective body 202. After snapping, the protective body 202 abuts against the main body 201 through the snap-fit ​​protrusion 203.

[0077] In this embodiment, the cover assembly adopts the above design. Through the lower plastic 2, the protective body 202 on the lower plastic 2 can fold towards the side of the cover 1 where the terminal post 101 connects to the tab 301, and abut against the side of the tab 301 facing the electrode assembly 3, thus providing physical isolation between the tab 301 and the electrode assembly 3. Simultaneously, the connecting part connects the main body 201 on the cover 1 to the protective body 202, clamping the tab 301 between the protective body 202 and the cover 1. This fixes the shape and position of the tab 301, preventing abnormal contact between the tabs 301 and between the tab 301 and the electrode assembly 3, which could lead to a battery short circuit, thereby improving battery safety.

[0078] An embodiment of the second aspect of this application provides a battery having a cover assembly as described above on its casing.

[0079] In this embodiment, the battery achieves physical isolation between the tab 301 and the electrode group 3 through the above-mentioned cover plate assembly, and fixes the shape and position of the tab 301, reducing the risk of short circuit in the electrode group 3 inside the battery, thereby improving the safety of the battery.

[0080] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate assembly 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 poles are multiple poles spaced apart along the length of the cover plate and used to connect with the pole lugs of the pole group. The lower plastic has a main body conforming to the shape of the cover plate and a protective body provided on one side of the length of the main body. A connecting part is provided between the protective body and the main body. The protective body can be folded relative to the main body and connected to the main body through the connecting part. After connection, the protective body blocks the side of the plurality of poles facing the pole group and abuts against the side of the pole tab facing away from the pole.

2. The cover plate assembly according to claim 1, characterized in that: The main body has a hollow area in the middle of its length direction, and the protective body includes a first abutting part, a protective part and a second abutting part arranged sequentially in the direction away from the main body, with the protective part corresponding to the hollow area; The first abutting portion and the second abutting portion abut against the tabs on the pole posts at both ends, and the connecting portion is provided between the main body and the first abutting portion and the second abutting portion.

3. The cover plate assembly according to claim 2, characterized in that: The connecting part includes a buckle provided on the main body and a snap-fit ​​hole provided on the protective body; The buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole. Each sub-buckle has a connecting block connected to the main body and a snap-fit ​​block protruding radially outward from the connecting block. The buckle is snapped onto the protective body by the snap-fit ​​block.

4. The cover plate assembly according to claim 3, characterized in that: The first abutting portion has a snap-fit ​​hole at one end away from the main body, and the snap-fit ​​hole is a plurality of holes spaced apart on the first abutting portion along the width direction of the protective body; and / or, Both ends of the second abutting portion are provided with the snap-fit ​​hole, and the snap-fit ​​hole is a plurality of holes spaced apart on the second abutting portion along the width direction of the protective body.

5. The cover plate assembly according to claim 3, 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 or flush with the protective body.

6. The cover plate assembly according to claim 3, characterized in that: The spacing W between two adjacent snap fasteners and the snap-fit ​​length W1 between each snap-fit ​​block and the protective body in the radial direction of the snap-fit ​​hole satisfy: W≥2W1; And / or, The thickness W2 of each of the said snap-fit ​​blocks along the axial direction of the snap-fit ​​hole is between 0.6mm and 4.5mm.

7. The cover plate assembly according to claim 3, characterized in that: The protective body is provided with a snap-fit ​​protrusion protruding towards one side of the main body, and the snap-fit ​​hole is located at the snap-fit ​​protrusion and penetrates the protective body; After being snapped in, the protective body abuts against the main body through the snap-in protrusion.

8. The cover plate assembly according to claim 2, characterized in that: The protective part protrudes to the side away from the main body and forms a groove, with a vent hole on the bottom wall of the groove.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The main body and the protective body 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 body, and a rubber-reducing groove is provided on the connecting rib.

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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