Battery and its cover assembly

Abstract

This application relates to the field of power battery technology and provides a battery and its cover assembly. The cover assembly of this application is applied to a battery casing and includes a cover plate through which terminal posts are inserted, and a lower plastic layer disposed on the cover plate. Multiple terminal posts are disposed and used to connect with the tabs of an electrode assembly. The lower plastic layer has a main body portion conforming to the cover plate, and a protective portion disposed on one side of the main body portion in the width direction, with a snap-fit ​​portion between the protective portion and the cover plate. The protective portion can be folded onto the main body portion and connected to the cover plate via the snap-fit ​​portion, and the snap-fitted protective portion abuts against the side of the multiple tabs opposite to the cover plate. By providing a lower plastic layer including a main body portion and a protective portion on the cover plate, this application allows the folded protective portion to abut against the side of the tabs opposite to the cover plate, thereby forming a physical barrier structure. This effectively prevents the tabs from inserting into the electrode assembly and causing a short circuit, thus improving battery safety.

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 battery manufacturing, the welding of the tabs to the cover plate is one of the key steps in battery assembly. As the bridge connecting the internal electrodes of the battery to the external circuitry, the quality of the connection between the tabs and the cover plate directly affects the overall performance and safety of the battery.

[0003] In related technologies, there is a lack of effective shaping and fixing structures between the tabs and the electrode assembly. This makes it difficult for the tabs to maintain a consistent state after bending, resulting in significant morphological differences. This 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 for use on a battery casing includes a cover plate through which terminal posts are passed, and a lower plastic material disposed on the cover plate; The cover plate is elongated, and the poles are a plurality of 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 portion conforming to the cover plate and a protective portion provided on one side of the width direction of the main body portion. The protective portion and the cover plate are provided with a snap-fit ​​part, and the main body portion is provided with a clearance hole corresponding to the snap-fit ​​part. The protective part can be folded onto the main body and connected to the cover plate via the snap-fit ​​part, and the snap-fitted protective part abuts against the side of the plurality of electrode tabs facing away from the cover plate.

[0006] Furthermore, the protective part includes a protective plate and a connecting arm disposed on one side of the protective plate; the connecting arm is connected to the main body, the connecting arm is provided with a rubber reduction groove, and the connecting arm is bendable.

[0007] Furthermore, the protective portion is an elongated strip extending along the length direction of the main body portion; the connecting arm extends along the length direction of the protective portion, and / or, the connecting arm is a plurality of arms spaced apart along the length direction of the protective portion.

[0008] Furthermore, the connecting arms are two that are spaced apart along the length of the protective part, and the distance L between the two connecting arms is between 25mm and 280mm; and / or, the protective plate has a clearance opening on the edge of the side away from the connecting arm in the width direction, and the clearance opening is provided in a one-to-one correspondence with the pole post.

[0009] Furthermore, the main body is provided with an abutting protrusion that protrudes to the side away from the cover plate; the clearance hole is provided through the abutting protrusion, and the protective part abuts against the abutting protrusion after being engaged with the cover plate.

[0010] Furthermore, the snap-fit ​​portion includes a buckle provided on one of the protective portion and the cover plate, and a snap-fit ​​hole provided on the other of the protective portion and the cover plate; the clearance hole is provided corresponding to the snap-fit ​​hole.

[0011] Furthermore, the buckle includes two sub-buckles arranged opposite each other, each sub-buckle having a connecting block connected to the protective part, and a snap-fit ​​block protruding radially outward from the connecting block; the snap-fit ​​hole is provided on the cover plate, and the buckle is snapped onto the cover plate 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 snap-fit ​​hole, and the snap-fit ​​block is snapped into the second snap-fit ​​hole.

[0013] Furthermore, the snap-fit ​​hole is a blind hole provided on the cover plate; and / or, the diameter of the clearance hole is larger than the diameter of the first snap-fit ​​hole.

[0014] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application, by providing a lower plastic part on the cover plate, and the lower plastic part including a main body and a protective part, allows the folded protective part to abut against the side of the tab facing away from the cover plate, thereby forming a physical blocking structure. This effectively prevents the tab from being inserted into the electrode assembly, thus better avoiding battery short circuits and improving battery safety. At the same time, the protective part is connected to the cover plate through a snap-fit ​​part, which is simple in structure and easy to design and implement.

[0015] (2) By setting up a protective part including a protective plate and a connecting arm, and opening a rubber reduction groove on the connecting arm, the protective plate can be easily folded, and it is beneficial to keep the folded protective plate in a folded state. At the same time, the rubber reduction groove can provide a certain deformation space for the connecting arm, avoiding bending damage due to excessive rigidity, so as to effectively ensure the firmness of the connecting arm.

[0016] (3) By setting the protective part to be a long strip extending along the length of the main body, it can effectively cover the end of the electrode tab away from the electrode assembly, forming a physical barrier structure between the end of the electrode tab away from the electrode assembly and the electrode assembly, thereby effectively avoiding the risk of the electrode tab puncturing the electrode assembly. On this basis, setting the connecting arm to extend along the length of the protective part can effectively ensure the reliability of the connection between the main body and the protective part, and make it easy for the protective part to be folded over through the connecting arm. When the connecting arm is set to be multiple and spaced along the length of the protective part, it can effectively improve the reliability of the connection between the main body and the protective part, while effectively avoiding stress concentration when the protective part is flipped over.

[0017] (4) By setting two connecting arms spaced apart along the length of the protective part, the resistance to bending of the protective part is reduced while maintaining the connection strength between the protective part and the main body. Simultaneously, setting the distance L between the two connecting arms to be between 25mm and 280mm effectively avoids the high-stress area formed by stress superposition caused by excessively small spacing between adjacent connecting arms. Furthermore, it effectively avoids the situation where excessively large spacing between adjacent connecting arms leads to deformation of the connecting arms and torsion of the protective part. An allowance opening is provided on the edge of the protective plate away from the width direction of the connecting arms, facilitating bending of the electrode lug after connection with the electrode post.

[0018] (5) By setting an abutting protrusion on the main body, when the protective part is folded over and the cover plate is connected to the protective part using the snap-fit ​​part, the protective part abuts against the abutting protrusion, which can effectively maintain the distance between the main body and the protective part, thereby effectively avoiding the situation where the protective part is folded over too much, resulting in the connecting arm being excessively bent and damaged.

[0019] (6) By setting the snap-fit ​​part including the snap-fit ​​buckle and the snap-fit ​​hole, when connecting the main body and the cover plate, only a certain pressing force is needed to make the snap-fit ​​buckle snap into the snap-fit ​​hole. No external auxiliary tools are needed, which has the effect of simple operation and improving assembly efficiency.

[0020] (7) By setting the snap-fit ​​hole on the cover plate and the buckle on the protective part, after the electrode lug is bent, the side of the protective part without the buckle is close to the electrode group. This ensures that the surface of the protective part close to the electrode group is smooth, effectively avoiding the buckle piercing the electrode group. Furthermore, by setting the buckle as two oppositely arranged sub-buckles, the load is evenly distributed on the two connecting blocks through symmetrical design, which helps to reduce the risk of single-point overload. Moreover, the symmetrical arrangement of the two sub-buckles makes it easy for them to shift together towards the center line of the buckle, so that the buckle can be smoothly snapped into the snap-fit ​​hole.

[0021] (8) By setting the snap-fit ​​holes, including a first snap-fit ​​hole and a second snap-fit ​​hole, and making the diameter of the first snap-fit ​​hole smaller than that of the second snap-fit ​​hole, the snap-fit ​​block can play a preliminary positioning role after being inserted into the first snap-fit ​​hole. When the snap-fit ​​block is snapped into the second snap-fit ​​hole, a radial limit is formed, which can effectively prevent the buckle from coming out axially or radially. Setting the second snap-fit ​​hole to a larger diameter can provide a larger snap-fit ​​space for the snap-fit ​​block, which can increase the contact area between the two and thus improve the snap-fit ​​firmness between the cover plate and the protective part.

[0022] (9) By setting the snap-fit ​​hole as a blind hole, the snap-fit ​​can be effectively prevented from protruding from the cover plate, so that the outer surface of the cover plate is in a flat state, which is conducive to ensuring aesthetics and can also effectively prevent the leakage of electrolyte inside the battery. In addition, the diameter of the clearance hole is larger than the diameter of the first snap-fit ​​hole, which can effectively reduce the obstruction of the clearance hole to the snap-fit, thus making it easier for the snap-fit ​​to be snapped into the snap-fit ​​hole.

[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 lower plastic as described in the embodiments of this application; Figure 2 This is a schematic diagram of the lower plastic as described in an embodiment of this application from another perspective; Figure 3 This is a schematic diagram showing the electrode tab welded to the electrode post and the lower plastic in an unfolded state, as described in an embodiment of this application. Figure 4 This is a schematic diagram showing the electrode tab welded to the electrode post and the lower plastic in a closed state, as described in an embodiment of this application. Figure 5 For this Figure 1 A sectional view of section AA; Figure 6 for Figure 2 A magnified view of part B in the middle section; Figure 7 for Figure 2 A magnified view of part C in the middle; Figure 8 This is a schematic diagram of the connecting arm described in an embodiment of this application; Figure 9 for Figure 8 A sectional view of the DD section; Figure 10 for Figure 9 A magnified view of part E in the middle; Figure 11 This is a schematic diagram showing the cover plate assembly described in this application assembled on the electrode tab, with the electrode tab in a bent state. Figure 12 for Figure 11 A diagram from another perspective; Figure 13 for Figure 12 Sectional view at FF; Figure 14 for Figure 13 A magnified view of part G in the middle; Figure 15 This is a schematic diagram of another structure of the cover plate assembly described in an embodiment of this application; Figure 16 This is a cross-sectional view showing another structure of the cover assembly applied to a battery.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 101. Pole post; 2. Lower plastic part; 201. Main body; 2011. Clearance hole; 2012. Through hole; 202. Protective part; 2021. Protective plate; 20211. Clearance opening; 2022. Connecting arm; 20221. Reduction groove; 2023. Protective cavity; 2024. Notch; 3. Pole group; 4. Polar ears; 5. Snap-fit ​​part; 501. Snap-fit; 5011. Sub-snap-fit; 50111. Connecting block; 50112. Snap-fit ​​block; 5012. Connecting rib; 502. Snap-fit ​​hole; 5021. First snap-fit ​​hole; 5022. Second snap-fit ​​hole; 6. Abutting the protrusion; x, length direction; y, width direction; z, thickness direction. Detailed Implementation

[0027] 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.

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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In related technologies, there is a lack of effective shaping and fixing structures between the tab 4 and the electrode group 3. This results in the tab 4 being difficult to maintain a consistent state after bending, with significant differences in shape, which can easily lead to problems such as tab 4 displacement and abnormal contact, thereby creating a short circuit risk, seriously threatening the safety of battery use, and limiting further improvement of battery product performance.

[0034] In view of this, to overcome the shortcomings of the related art, an embodiment of the first aspect of this application provides a cover plate assembly. In the cover plate assembly of this embodiment, combined with Figures 1 to 7 As shown, in terms of overall design, the cover assembly is applied to the battery casing, including a cover 1 through which the terminal post 101 passes, and a lower plastic 2 disposed on the cover 1.

[0035] The cover plate 1 is elongated, and multiple pole posts 101 are spaced apart along the length x of the cover plate 1, used to connect with the tabs 4 of the pole assembly 3. The lower plastic 2 has a main body portion 201 conforming to the cover plate 1, and a protective portion 202 located on one side of the width y of the main body portion 201. A snap-fit ​​portion 5 is provided between the protective portion 202 and the cover plate 1. Corresponding to the snap-fit ​​portion 5, the main body portion 201 has a clearance hole 2011. The protective portion 202 can be folded onto the main body portion 201 and connected to the cover plate 1 through the snap-fit ​​portion 5. After snapping, the protective portion 202 abuts against the side of the multiple tabs 4 facing away from the cover plate 1.

[0036] Therefore, by providing a lower plastic part 2 on the cover plate 1, and by providing the lower plastic part 2 including a main body 201 and a protective part 202, the folded protective part 202 can abut against the side of the tab 4 facing away from the cover plate 1, thereby forming a physical blocking structure. This effectively prevents the tab 4 from inserting into the electrode assembly 3, thus better avoiding battery short circuits and effectively improving battery safety. At the same time, after the protective part 202 is connected to the cover plate 1 through the snap-fit ​​part 5, it can effectively prevent the tab 4 from shifting or making abnormal contact, thus preventing the risk of short circuits.

[0037] Based on the above overall introduction, specifically, as an exemplary structural form, combined with Figures 1 to 7 As shown, similar to existing technologies, a seal is provided between the cover plate 1 and the terminal post 101. Furthermore, the specific structure of the terminal post 101 and the structure of the seal can refer to existing structures, and this embodiment does not make any improvements thereto. Moreover, the lower plastic 2 can be made of the insulating material commonly used in existing batteries, and no specific limitations are made here.

[0038] It is understandable that there are generally two pole posts 101 spaced apart along the length x of the cover plate 1. The tabs 4, protective parts 202, and two pole posts 101 on the pole assembly 3 are correspondingly arranged, and the two tabs 4 and two pole posts 101 need to be welded together. After connection, the main body 201 is located between the cover plate 1 and the tabs 4, and the protective parts 202 are located on the side of the tabs 4 facing away from the cover plate 1. Furthermore, after the tabs 4 are bent, the protective parts 202 are spaced apart between the tabs 4 and the pole assembly 3.

[0039] In some of the exemplary implementations, combined with Figure 1 , Figure 2 and Figure 5 As shown, the protective part 202 includes a protective plate 2021 and a connecting arm 2022 disposed on one side of the protective plate 2021. The connecting arm 2022 is connected to the main body part 201, and the connecting arm 2022 is provided with a rubber reduction groove 20221, and the connecting arm 2022 is bendable.

[0040] Therefore, by setting the protective part 202 to include a protective plate 2021 and a connecting arm 2022, and by creating a rubber-reducing groove 20221 on the connecting arm 2022, the protective plate 2021 can be easily folded, and it is beneficial to keep the folded protective plate 2021 in a folded state. At the same time, the rubber-reducing groove 20221 can provide a certain deformation space for the connecting arm 2022, avoiding bending damage due to excessive rigidity, thus effectively ensuring the firmness of the connecting arm 2022.

[0041] It is worth noting that the main body 201, the protective plate 2021 and the connecting arm 2022 are integrally molded, which can effectively avoid assembly errors caused by assembling multiple parts, and can make the lower plastic 2 have good firmness and be easy to produce and use.

[0042] In some of the exemplary implementations, combined with Figure 3 , Figure 4 and Figure 8 As shown, the protective portion 202 is an elongated strip extending along the length x of the main body portion 201, and the connecting arm 2022 extends along the length x of the protective portion 202. Here, by making the protective portion 202 an elongated strip extending along the length x of the main body portion 201, the end of the tab 4 facing away from the electrode assembly 3 can be effectively covered, forming a physical barrier structure between the end of the tab 4 facing away from the electrode assembly 3 and the electrode assembly 3, thereby effectively avoiding the risk of the tab 4 puncturing the electrode assembly 3.

[0043] Based on this, the connecting arm 2022 extends along the length x of the protective part 202, which can effectively ensure the reliable connection between the main body 201 and the protective part 202, and make it easy for the protective part 202 to be folded through the connecting arm 2022.

[0044] In some of the exemplary implementations, the combination continues Figure 3 , Figure 4 and Figure 8 As shown, the connecting arms 2022 are arranged in multiple units at intervals along the length x of the protective part 202. Therefore, when the connecting arms 2022 are arranged in multiple units at intervals along the length x of the protective part 202, the connection between the main body 201 and the protective part 202 can be effectively improved, and stress concentration can be effectively avoided when the protective part 202 is flipped.

[0045] In some of the exemplary implementations, combined with Figure 8 As shown, there are two connecting arms 2022 arranged at intervals along the length x of the protective part 202, and the distance L between the two connecting arms 2022 is between 25mm and 280mm.

[0046] Therefore, by setting two connecting arms 2022 spaced at intervals along the length x of the protective part 202, the connection strength between the protective part 202 and the main body 201 is maintained while reducing the resistance when the protective part 202 is folded. Simultaneously, setting the distance L between the two connecting arms 2022 to between 25mm and 280mm effectively avoids high-stress areas caused by stress superposition due to excessively small spacing between adjacent connecting arms 2022. Furthermore, it effectively avoids the situation where excessively large spacing between adjacent connecting arms 2022 leads to excessively small connecting arms, resulting in deformation of the connecting arms 2022 and causing torsion of the protective part 202.

[0047] In specific implementation, such as Figure 9 As shown, for example, the spacing L between two adjacent connecting arms 2022 can be set to 25mm, 50mm, 100mm, 200mm, 280mm or other values.

[0048] In some of the exemplary implementations, combined with Figure 3 and Figure 4 As shown, the protective plate 2021 has a clearance opening 20211 on the edge of the protective plate 2021 away from the connecting arm 2022 in the width direction y. The clearance opening 20211 is provided one-to-one with the pole post 101. By providing the clearance opening 20211 on the edge of the protective plate 2021 away from the connecting arm 2022 in the width direction y, the connection between the electrode tab 4 and the pole group 3 can be avoided, making it easier for the electrode tab 4 to bend after being connected to the pole post 3.

[0049] In some of the exemplary implementations, combined with Figure 2 and Figure 6 As shown, the main body 201 is provided with an abutting protrusion 6 that protrudes to the side away from the cover plate 1, and the clearance hole 2011 is provided through the abutting protrusion 6. The protective part 202 is engaged with the cover plate 1 and abuts against the abutting protrusion 6.

[0050] Therefore, by providing the abutting protrusion 6 on the main body 201, when the protective part 202 is folded over and the cover plate 1 is connected to the protective part 202 using the snap-fit ​​part 5, the protective part 202 abuts against the abutting protrusion 6, which can effectively maintain the distance between the main body 201 and the protective part 202, thereby effectively avoiding the situation where the protective part 202 is folded over too much, resulting in the connecting arm 2022 being excessively bent and damaged.

[0051] In specific implementation, the main body 201 is provided with an abutting protrusion 6 that protrudes away from the cover plate 1. That is, the abutting protrusion 6 is located on the side of the thickness direction z of the main body 201. On this basis, the abutting protrusion 6 is integrally formed with the main body 201, and the thickness of the abutting protrusion 6 is the same as the thickness of the connecting arm 2022 after bending. This makes it easier to keep the interval between the main body 201 and the protective part 202 consistent, so that the cover plate assembly can be better placed on the electrode tab 4.

[0052] In some of the exemplary implementations, combined with Figure 2 ,as well as Figures 7 to 10 As shown, the snap-fit ​​portion 5 includes a snap fastener 501 provided on one of the protective portion 202 and the cover plate 1, and a snap-fit ​​hole 502 provided on the other of the protective portion 202 and the cover plate 1; the clearance hole 2011 is provided corresponding to the snap-fit ​​hole 502.

[0053] Therefore, by setting the snap-fit ​​part 5 to include a snap-fit ​​501 and a snap-fit ​​hole 502, when connecting the main body part 201 and the cover plate 1, only a certain pressing force is needed to make the snap-fit ​​501 snap into the snap-fit ​​hole 502, without the need for external auxiliary tools, which has the effect of simple operation and improving assembly efficiency.

[0054] In some of the exemplary implementations, the combination continues Figures 7 to 10 As shown, the buckle 501 includes two sub-buckles 5011 arranged opposite to each other. Each sub-buckle 5011 has a connecting block 50111 connected to the protective part 202, and a snap-fit ​​block 50112 protruding radially outward from the connecting block 50111. The snap-fit ​​hole 502 is provided on the cover plate 1, and the buckle 501 is snapped onto the cover plate 1 by the snap-fit ​​block 50112.

[0055] Based on the above description, by setting the snap-fit ​​hole 502 on the cover plate 1 and the buckle 501 on the protective part 202, after the electrode tab 4 is bent, the side of the protective part 202 without the buckle 501 is close to the electrode group 3. This ensures that the surface of the protective part 202 close to the electrode group 3 is smooth, effectively preventing the buckle 501 from piercing the electrode group 3. Furthermore, by setting the buckle 501 as two oppositely arranged sub-buckles 5011, the symmetrical design allows the load to be evenly distributed on the two connecting blocks 50111, which helps reduce the risk of single-point overload. Moreover, the symmetrical arrangement of the two sub-buckles 5011 facilitates their common offset towards the center line of the buckle 501, allowing the buckle 501 to smoothly snap into the snap-fit ​​hole 502.

[0056] In specific implementation, combined with Figure 8As shown, a connecting rib 5012 can be provided between the two sub-buckles 5011, and the connecting rib 5012 is connected to the protective part 202. This not only improves the structural strength of the buckle 501 and the connection strength between it and the protective part 202, but also facilitates the radial inward retraction of the end of the two sub-buckles 5011 that engages with the cover plate 1, thereby facilitating the engagement with the cover plate 1.

[0057] It is worth noting that, to facilitate the engagement of the snap fastener 501 into the snap-fit ​​hole 502, the end of the snap fastener 501 facing away from the protective part 202 is chamfered and has a guide bevel. The guide bevel guides the snap fastener 501 into the snap-fit ​​hole 502. By setting the guide bevel, the alignment difficulty of the snap-fit ​​hole 502 can be effectively reduced, making it easier for the snap fastener 501 to engage in the snap-fit ​​hole 502, thereby effectively improving assembly efficiency. In specific implementation, the guide bevel is a conical surface set at the end of the snap fastener 501.

[0058] In some of the exemplary implementations, the combination continues Figure 10 As shown, the snap-fit ​​hole 502 includes a first snap-fit ​​hole 5021 and a second snap-fit ​​hole 5022 that are connected to each other. The diameter of the first snap-fit ​​hole 5021 is smaller than the diameter of the second snap-fit ​​hole 5022. The connecting block 50111 is inserted into the first snap-fit ​​hole 5021, and the snap-fit ​​block 50112 is snapped into the second snap-fit ​​hole 5022.

[0059] As described above, by setting the snap-fit ​​hole 502 to include a first snap-fit ​​hole 5021 and a second snap-fit ​​hole 5022, and making the diameter of the first snap-fit ​​hole 5021 smaller than the diameter of the second snap-fit ​​hole 5022, the snap-fit ​​block 50112 can play a preliminary positioning role after being inserted into the first snap-fit ​​hole 5021. After the snap-fit ​​block 50112 is engaged in the second snap-fit ​​hole 5022, a radial limit is formed, which can effectively prevent the buckle 501 from coming out axially or radially. Setting the second snap-fit ​​hole 5022 to a larger diameter can provide a larger snap-fit ​​space for the snap-fit ​​block 50112, which can increase the contact area between the two and thus improve the snap-fit ​​firmness between the cover plate 1 and the protective part 202.

[0060] It is worth noting that, in combination Figure 13 As shown, based on the abutment protrusion 6, the abutment protrusion 6 has a circular structure, and the abutment protrusion 6 is coaxially arranged with the snap-fit ​​hole 502. That is, the abutment protrusion 6, the clearance hole 2011, and the snap-fit ​​hole 502 are all coaxially arranged. When the snap-fit ​​block 50112 is inserted into the second snap-fit ​​hole 5022, the connecting block 50111 is located within the abutment protrusion 6 and the clearance hole 2011.

[0061] In some of the exemplary implementations, combined with Figures 11 to 14 As shown, the snap-fit ​​hole 502 is a blind hole provided on the cover plate 1; the diameter of the clearance hole 2011 is larger than the diameter of the first snap-fit ​​hole 5021.

[0062] By designing the snap-fit ​​hole 502 as a blind hole, the snap fastener 501 can be effectively prevented from protruding from the cover plate 1, ensuring that the outer surface of the cover plate 1 remains flat. This effectively prevents the snap fastener 501 from protruding from the cover plate 1 and affecting the connection of the pole post 101. Furthermore, by setting the diameter of the clearance hole 2011 to be larger than the diameter of the first snap-fit ​​hole 5021, the obstruction of the clearance hole 2011 on the snap fastener 501 can be effectively reduced, thereby facilitating the snap fastener 501 to be snapped into the snap-fit ​​hole 502.

[0063] In addition, when applying it, it can also be like... Figure 15 and Figure 16 As shown, corresponding to the through hole 2012 on the main body 201 that avoids the electrode post 101, 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 electrode tab 4, thereby reducing the risk of welding slag piercing the separator and causing a short circuit in the battery, and improving the safety performance of the battery.

[0064] In some exemplary embodiments, the protective portion 202 has a notch 2024 located at the edge of the opening end of the protective cavity 2023, which is used for the flow of electrolyte. In a specific embodiment, 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 exemplary embodiments, the opening area of ​​the notch 2024 can be relatively large, giving 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 202 and the electrode assembly 3 after the tab 4 is bent, so that the protective cavity 2023 abuts against the electrode assembly 3. Therefore, when the electrode assembly 3 moves up and down, the protective cavity 2023 can buffer the movement of the tab 4, achieving the purpose of protecting the electrode assembly 3.

[0066] In addition, this application also relates to a battery having a cover assembly as described above on its casing.

[0067] The battery described in this application, by providing the cover assembly as described above, can have better safety.

[0068] 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 a plurality of 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 portion conforming to the cover plate and a protective portion provided on one side of the width direction of the main body portion. The protective portion and the cover plate are provided with a snap-fit ​​part, and the main body portion is provided with a clearance hole corresponding to the snap-fit ​​part. The protective part can be folded onto the main body and connected to the cover plate via the snap-fit ​​part, and the snap-fitted protective part abuts against the side of the plurality of electrode tabs facing away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The protective part includes a protective plate and a connecting arm disposed on one side of the protective plate in the width direction; The connecting arm is connected to the main body, the connecting arm is provided with a rubber reduction groove, and the connecting arm can be bent.

3. The cover plate assembly according to claim 2, characterized in that: The protective portion is a long strip extending along the length of the main body portion; The connecting arm extends along the length of the protective portion, and / or, the connecting arm is a plurality of arms spaced apart along the length of the protective portion.

4. The cover plate assembly according to claim 3, characterized in that: The connecting arms are two spaced apart along the length of the protective portion, and the distance L between the two connecting arms is between 25mm and 280mm; and / or, The protective plate has a clearance opening on the edge away from the connecting arm in the width direction, and the clearance opening is provided in a one-to-one correspondence with the pole post.

5. The cover plate assembly according to claim 4, characterized in that: The main body is provided with an abutting protrusion that protrudes away from the cover plate; The clearance hole extends through the abutment protrusion, and the protective part abuts against the abutment protrusion after being engaged with the cover plate.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The snap-fit ​​portion includes a buckle provided on one of the protective part and the cover plate, and a snap-fit ​​hole provided on the other of the protective part and the cover plate; The clearance hole is provided corresponding to the snap-fit ​​hole.

7. The cover plate assembly according to claim 6, characterized in that: The buckle includes two sub-buckles arranged opposite each other, each sub-buckle having a connecting block connected to the protective part, and a snap-fit ​​block protruding radially outward from the connecting block; The snap-fit ​​hole is provided on the cover plate, and the buckle is snapped onto the cover plate 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, and the snap-fit ​​block is snapped into the second card hole.

9. The cover plate assembly according to claim 8, characterized in that: The snap-fit ​​hole is a blind hole provided on the cover plate; and / or, The diameter of the clearance hole is larger than the diameter of the first card hole.

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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