Cover plate assembly and battery

Abstract

The application relates to the battery technical field and provides a cover plate assembly and a battery. The cover plate assembly of the application is applied to a battery shell and comprises a cover plate provided with a pole column and a lower plastic arranged on the cover plate. The cover plate is in a strip shape, the lower plastic has a main body part arranged along the cover plate and protection parts arranged at both ends of the main body part in the length direction, and a clamping part is arranged between each protection part and the cover plate. Corresponding to the clamping part, the main body part is provided with a avoiding hole. The pole column is used for being connected with a tab of a pole group, each protection part can be folded on the main body part and connected with the cover plate through the clamping part, and the protection part after clamping is abutted against a side of the tab at the corresponding end which is opposite to the cover plate. The cover plate assembly of the application can play the roles of shaping and fixing the tab, prevent the tab from being inserted into the pole group in reverse to cause internal short circuit of the battery, and is thus favorable for improving the safety performance of the battery.

Description

Technical Field

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

[0002] With the rapid development of the electric vehicle industry, research on electric vehicle battery technology is increasing and deepening. In the current battery structure, the cell includes tabs, which are welded to terminals passing through a cover plate to achieve electrical connection. However, in existing battery electrode assemblies, the tabs are prone to deformation after welding to the cover plate and cannot be effectively brought together. This can cause the tabs to easily insert backwards into the electrode assembly, leading to risks such as internal short circuits and affecting battery safety and performance. Utility Model Content

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

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly applied to a battery casing includes a cover plate through which terminal posts are passed, and a lower plastic material disposed on the cover plate; The cover plate is elongated, and the lower plastic has a main body portion that conforms to the shape of the cover plate, and protective portions at both ends of the main body portion along its length. A snap-fit ​​portion is provided between each of the protective portions and the cover plate, and a clearance hole is provided on the main body portion corresponding to the snap-fit ​​portion. The pole post is used to connect with the tabs of the pole group. Each of the protective parts can be folded onto the main body and connected to the cover plate through the snap-fit ​​part. After snapping, the protective part abuts against the side of the corresponding end of the tab that is away from the cover plate.

[0005] Furthermore, the main body is provided with an abutting protrusion protruding away from the cover plate, and the clearance hole is provided through the abutting protrusion; the protective part is engaged with the cover plate and abuts against the abutting protrusion.

[0006] 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, with the clearance hole corresponding to the snap-fit ​​hole.

[0007] Furthermore, the buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the protective part, and a snap-fit ​​block protruding radially outward from the connecting block; the buckle is snapped onto the cover plate by the snap-fit ​​block.

[0008] 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.

[0009] 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.

[0010] Furthermore, the end of the clearance hole away from the cover plate is provided with an outwardly expanding guide surface, which is used to guide the buckle through the clearance hole.

[0011] Furthermore, the main body and the protective part are integrally formed. The main body has a plate and a connecting rib protruding to one side of the plate. The connecting rib is connected to the protective part and is provided with a glue-reducing groove.

[0012] Furthermore, the main body and the protective part are integrally formed. The protective part includes a protective plate for abutting the electrode tab and a connecting ear connected to the main body. The connecting ear protrudes to one side of the protective plate and has a hollow hole.

[0013] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly of this application is provided with a protective part that can be folded onto the main body and can be snapped into the main body. The protective part after snapping into the main body can abut against the side of the corresponding end of the electrode tab facing away from the cover plate, thereby playing the role of shaping and fixing the electrode tab, preventing the electrode tab from being inserted into the electrode group and causing an internal short circuit in the battery, which is beneficial to improving the battery safety performance.

[0014] (2) The main body is provided with an abutment protrusion that protrudes away from the cover plate. The clearance hole passes through the abutment protrusion, and the protective part abuts against the abutment protrusion after being snapped into the cover plate. This design can limit the movement of the protective part, preventing it from being excessively folded and squeezed, which could cause the electrode tab to deform and thus cause battery failure, thereby improving battery safety. At the same time, it can also prevent foreign objects such as welding slag at the welding position from puncturing the separator and causing internal short circuits in the battery, thereby further improving the battery safety performance.

[0015] (3) The snap-fit ​​part includes a snap fastener on one of the protective part and the cover plate, and a snap-fit ​​hole on the other of the protective part and the cover plate, with a clearance hole corresponding to the snap-fit ​​hole. This configuration allows the cover plate and the protective part to be snapped together via the snap fastener and the snap-fit ​​hole, ensuring the snap-fit ​​strength between the cover plate and the protective part, and ensuring the connection strength and stability between the protective part and the cover plate, while facilitating the installation between the cover plate and the protective part, thereby reducing assembly difficulty and improving production efficiency. Furthermore, the clearance hole, which mates with the snap-fit ​​hole, can also guide the snap fastener into the snap-fit ​​hole, further reducing assembly difficulty.

[0016] (4) The snap fastener includes multiple sub-snap fasteners spaced circumferentially along the snap-fit ​​hole. Each sub-snap fastener has a connecting block connected to the protective part, and a snap-fit ​​block protruding radially outward from the connecting block. The snap fastener is secured to the cover plate by the snap-fit ​​block. This arrangement of multiple sub-snap fasteners forms an elastic structure, facilitating the engagement of the snap fastener with the snap-fit ​​hole on the cover plate, allowing the snap fastener to enter the snap-fit ​​hole and reducing assembly difficulty. At the same time, the design of multiple sub-snap fasteners also ensures the contact area between the snap fastener and the snap-fit ​​hole, thus ensuring both the snap fastening strength and the structural strength of the snap fastener.

[0017] (5) The snap-fit ​​hole includes a first snap-fit ​​hole and a second snap-fit ​​hole that are connected. The diameter of the first snap-fit ​​hole is smaller than that 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. This arrangement allows for the creation of a snap-fit ​​structure through the matching of different hole diameters, thereby limiting the movement of the protective part. It also facilitates the elastic deformation of the snap-fit ​​block, making it easier for the snap-fit ​​block to enter the first snap-fit ​​hole, thus simplifying assembly.

[0018] (6) The snap-fit ​​hole is a blind hole on the cover plate, and the diameter of the clearance hole is larger than the diameter of the first snap-fit ​​hole. In this way, the diameter of the clearance hole is larger than the diameter of the first snap-fit ​​hole, which makes it easier for the buckle to pass through the clearance hole and snap-fit ​​with the snap-fit ​​hole on the cover plate. At the same time, setting the snap-fit ​​hole as a blind hole on the cover plate not only helps to ensure the aesthetics of the cover plate assembly, but also prevents the electrolyte inside the battery from leaking to the outside of the battery through the snap-fit ​​hole, so as to ensure the normal operation of the battery.

[0019] (7) The end of the clearance hole away from the cover plate is provided with an outwardly expanding guide surface, which is used to guide the buckle through the clearance hole. This setting allows the buckle to enter the snap-fit ​​hole under the guidance of the guide surface, thereby reducing the assembly difficulty, reducing the assembly time, and thus improving the assembly efficiency.

[0020] (8) The main body and the protective part are integrally formed. The main body has a plate and a connecting rib protruding to one side of the plate. The connecting rib is connected to the protective part and has a glue-reducing groove. In this way, by providing a glue-reducing groove on the connecting rib, the rigidity of the connecting rib can be reduced, making the protective part easier to bend. This facilitates the smooth folding of the protective part onto the main body and its connection with the cover plate during assembly. The integrally formed main body and protective part also helps to simplify the process flow, reduce manufacturing difficulty, control manufacturing costs, and thus facilitate large-scale production.

[0021] (9) The main body and the protective part are integrally formed. The protective part includes a protective plate for abutting the electrode tab and a connecting ear connected to the main body. The connecting ear protrudes to one side of the protective plate and has a perforated hole. This design reduces the rigidity of the connecting ear by providing a perforated hole, making the protective plate easier to bend and facilitating its smooth folding onto the main body and engagement with the cover plate during assembly. At the same time, the integrally formed main body and protective part also simplify the process flow, reduce manufacturing difficulty, control manufacturing costs, and facilitate large-scale production.

[0022] Another object of this application is to provide a battery having the cover assembly as described above on its casing.

[0023] The battery of this application, by providing the battery pack housing structure as described above on the housing, can prevent the tabs from being inserted into the electrode assembly in reverse and causing a short circuit, which is beneficial to improving the battery safety performance. Attached Figure Description

[0024] 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 overall structure of the cover plate assembly described in the embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the structure shown from another perspective; Figure 3 This is a cross-sectional view of the cover plate assembly described in an embodiment of this application; Figure 4 for Figure 3 A partial view at point A in the middle; Figure 5 This is a schematic diagram of the overall structure of the lower plastic as described in the embodiments of this application; Figure 6 for Figure 5 A partial view at point B in the middle; Figure 7 for Figure 5 A schematic diagram of the structure shown from another perspective; Figure 8 for Figure 7 A partial view at point C; Figure 9 This is a cross-sectional view of the lower plastic as described in the embodiments of this application; Figure 10 for Figure 9 A partial view at point D; Figure 11 for Figure 9 A partial view at point E in the middle; Figure 12 for Figure 9 A partial view at point F in the middle; Figure 13 This is a schematic diagram of the mating structure between the cover plate assembly and the electrode assembly as described in the embodiments of this application; Figure 14 This is a schematic diagram of the overall structure of another embodiment of the plastic material described in this application. Figure 15 for Figure 14 A partial view at point G in the middle; Explanation of reference numerals in the attached figures: 1. Cover plate; 11. Terminal post; 2. Terminal lug; 3. Terminal assembly; 4. Lower plastic insert; 41. Main body; 411. Abutting protrusion; 4111. Clearance hole; 41111. Guide surface; 412. Explosion-proof valve vent; 413. Pole post perforation; 42. Protective part; 43. Connecting rib; 431. Glue reduction groove; 5. Snap-fit ​​part; 51. Snap-fit ​​hole; 511. First snap-fit ​​hole; 512. Second snap-fit ​​hole; 52. Buckle; 521. Sub-buckle; 5211. Connecting block; 5212. Snap-fit ​​block; 52121. Assembly chamfer; 52122. Bevel; 6. Connecting ear; 61. Hollow hole. Detailed Implementation

[0025] 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.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] An embodiment of the first aspect of this application provides a cover plate assembly applied to a battery casing, primarily for protecting the electrode assembly. Furthermore, the cover plate assembly of this embodiment, through its innovative structural design, can shape and fix the electrode tabs, preventing the electrode tabs from being inserted backwards into the electrode assembly and causing an internal short circuit in the battery, thereby improving the battery's safety performance.

[0032] In the battery structure of related technologies, the cell includes tabs, which are welded to terminals passing through a cover plate to achieve electrical connection. However, in existing battery electrode assemblies, the tabs are prone to deformation after welding to the cover plate and cannot be effectively brought together. This can cause the tabs to be inserted backwards into the electrode assembly, leading to risks such as internal short circuits and affecting battery safety and performance.

[0033] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 13 As shown, the overall design includes a cover plate 1 through which the pole post 11 passes, and a lower plastic 4 disposed on the cover plate 1.

[0034] The cover plate 1 is long and narrow. The lower plastic 4 has a main body part 41 that conforms to the shape of the cover plate 1, and protective parts 42 at both ends of the main body part 41 along its length. A snap-fit ​​part 5 is provided between each protective part 42 and the cover plate 1. A clearance hole 4111 is provided on the main body part 41 corresponding to the snap-fit ​​part 5.

[0035] The pole post 11 is used to connect with the pole tab 2 of the pole group 3. Each protective part 42 can be folded onto the main body part 41 and connected to the cover plate 1 through the snap-fit ​​part 5. After snapping, the protective part 42 abuts against the side of the pole tab 2 at the corresponding end that is away from the cover plate 1.

[0036] Therefore, by providing a protective part 42 that can be folded onto the main body 41 and snapped into the main body 41, and the protective part 42 after snapping into the main body 41 can abut against the side of the corresponding end of the tab 2 facing away from the cover plate 1, it can play the role of shaping and fixing the tab 2, preventing the tab 2 from being inserted into the electrode group 3 and causing an internal short circuit in the battery, thereby improving the battery safety performance.

[0037] Based on the above general introduction, specifically, in some exemplary embodiments, the cover plate assembly of this embodiment is composed of... Figures 1 to 13 As shown, it generally includes a tab 2, a pole post 11, an explosion-proof valve vent 412, and a pole post through hole 413.

[0038] The above-mentioned tabs 2 and terminals 11 can be derived from the relevant structures in existing batteries, and will not be described in detail here. The explosion-proof valve vent 412 is used to facilitate the venting of the explosion-proof valve, and the terminal through hole 413 is used for the terminal 11 to pass through. Their structures can be derived from the conventional forms in existing batteries, and will not be described in detail here either.

[0039] Combination Figure 2 , Figure 7 as well as Figure 12 As shown, in application, the main body 41 has an abutment protrusion 411 protruding away from the cover plate 1. A clearance hole 4111 passes through the abutment protrusion 411. The protective part 42 snaps into the cover plate 1 and abuts against the abutment protrusion 411. This design limits the protective part 42, preventing excessive folding and compression of the tab 2, which could deform the tab 2 and cause battery failure, thus improving battery safety. Simultaneously, it also prevents foreign objects such as welding slag at the welding location from puncturing the separator and causing internal short circuits, further enhancing battery safety performance.

[0040] Combination Figure 4 , Figure 8 as well as Figure 10 As shown, in some exemplary embodiments, the snap-fit ​​portion 5 includes a snap fastener 52 provided on one of the protective portion 42 and the cover plate 1, and a snap-fit ​​hole 51 provided on the other of the protective portion 42 and the cover plate 1, with a clearance hole 4111 corresponding to the snap-fit ​​hole 51. With this configuration, the cover plate 1 and the protective portion 42 are snapped together by the snap fastener 52 and the snap-fit ​​hole 51, thereby ensuring the snap-fit ​​strength between the cover plate 1 and the protective portion 42, ensuring the connection strength and stability between the protective portion 42 and the cover plate 1, while facilitating the installation between the cover plate 1 and the protective portion 42, thus reducing assembly difficulty and improving production efficiency. Furthermore, the clearance hole 4111, which cooperates with the snap-fit ​​hole 51, can also guide the snap fastener 52 into the snap-fit ​​hole 51, further reducing assembly difficulty.

[0041] In application, the buckle 52 and the snap hole 51 can be a set of corresponding ones, or two or three sets. Such a setting can improve the connection strength and stability between the protective part 42 and the cover plate 1.

[0042] Continue to combine Figure 4 , Figure 8 as well as Figure 10 As shown, in some exemplary embodiments, the snap fastener 52 includes a plurality of sub-snap fasteners 521 spaced circumferentially along the snap-fit ​​hole 51. Each sub-snap fastener 521 has a connecting block 5211 connected to the protective portion 42, and a snap-fit ​​block 5212 protruding radially outward from the connecting block 5211. The snap fastener 52 is snapped onto the cover plate 1 by the snap-fit ​​block 5212. This arrangement of multiple sub-snap fasteners 521 forms an elastic structure, facilitating the engagement of the snap fastener 52 with the snap-fit ​​hole 51 on the cover plate 1, allowing the snap fastener 52 to enter the snap-fit ​​hole 51, thus reducing assembly difficulty. Simultaneously, the design of multiple sub-snap fasteners 521 ensures sufficient contact area between the snap fastener 52 and the snap-fit ​​hole 51, thereby ensuring both the snap fastening strength and the structural strength of the snap fastener 52.

[0043] In specific implementation, the sub-buckles 521 in this embodiment can be four that are spaced apart circumferentially along the snap-fit ​​holes 51. Furthermore, the sub-buckles 521 in this embodiment can also be two that are arranged opposite each other, or three or more that are spaced apart circumferentially along the snap-fit ​​holes 51; further details will not be provided here.

[0044] It can also be combined Figure 4 , Figure 8 as well as Figure 10As shown, in some exemplary embodiments, each snap-fit ​​block 5212 has an assembly chamfer 52121 at the end away from the protective portion 42 or the cover plate 1, so that the snap-fit ​​52 can be engaged into the snap-fit ​​hole 51 during assembly, thereby avoiding damage to the snap-fit ​​52 during assembly. Simultaneously, each snap-fit ​​block 5212 has a bevel 52122 inclined towards the connecting block 5211 at the end near the protective portion 42 or the cover plate 1, which reduces friction during assembly, further facilitating the snap-fit ​​52 to engage into the snap-fit ​​hole 51 during assembly, and further preventing damage to the snap-fit ​​52 during assembly.

[0045] Furthermore, the buckle 52 in this embodiment can be two separate buckles 521 arranged opposite to each other, or it can be three or four separate buckles 521. It can also facilitate the buckle 52 to be snapped into the snap hole 51 during the assembly process, which will not be described in detail here.

[0046] Combination Figure 4 As shown, in some exemplary embodiments, the snap-fit ​​hole 51 includes a first snap-fit ​​hole 511 and a second snap-fit ​​hole 512 that are connected. The diameter of the first snap-fit ​​hole 511 is smaller than the diameter of the second snap-fit ​​hole 512. The connecting block 5211 is inserted into the first snap-fit ​​hole 511, and the snap-fit ​​block 5212 is snapped into the second snap-fit ​​hole 512. This arrangement allows for a snap-fit ​​structure to be created by the matching of different hole diameters, thereby limiting the movement of the protective part 42. It also facilitates the elastic deformation of the snap-fit ​​block 5212, making it easier for the snap-fit ​​block 5212 to enter the first snap-fit ​​hole 511, thus simplifying assembly.

[0047] Continue to combine Figure 4 As shown, in some exemplary embodiments, the snap-fit ​​hole 51 is a blind hole on the cover plate 1, and the diameter of the clearance hole 4111 is larger than the diameter of the first snap-fit ​​hole 511. This allows the buckle 52 to pass through the clearance hole 4111 and snap into the snap-fit ​​hole 51 on the cover plate 1. Furthermore, making the snap-fit ​​hole 51 a blind hole on the cover plate 1 not only helps maintain the aesthetics of the cover assembly but also prevents electrolyte leakage from inside the battery to the outside through the snap-fit ​​hole, thus ensuring the normal operation of the battery.

[0048] Combination Figure 4 , Figure 8 as well as Figure 10 As shown, in some exemplary embodiments, the end of the clearance hole 4111 away from the cover plate 1 is provided with an outwardly expanding guide surface 41111, which guides the buckle 52 through the clearance hole 4111. This arrangement allows the buckle 52 to enter the snap-fit ​​hole 51 under the guidance of the guide surface 41111, thereby reducing assembly difficulty, reducing assembly time, and thus improving assembly efficiency.

[0049] In some of the exemplary implementations, combined with Figure 6 as well as Figure 11 As shown, the main body 41 and the protective part 42 are integrally formed. The main body 41 has a plate and a connecting rib 43 protruding to one side of the plate. The connecting rib 43 is connected to the protective part 42, and the connecting rib 43 is provided with a reducing groove 431. In this way, by providing a reducing groove 431 on the connecting rib 43, the rigidity of the connecting rib 43 can be reduced, making the protective part 42 easier to bend. This facilitates the smooth folding of the protective part 42 onto the main body 41 and its snap-fit ​​connection with the cover plate 1 during assembly. The integrally formed main body 41 and protective part 42 also helps to simplify the process flow, reduce manufacturing difficulty, thereby controlling manufacturing costs and facilitating mass production.

[0050] It should be noted that any related structures not mentioned in this embodiment can be referred to as those well known to those skilled in the art, and will not be described in detail here.

[0051] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 13 As shown, it may include, for example, a cover plate 1 through which the pole post 11 passes, and a lower plastic 4 disposed on the cover plate 1.

[0052] The cover plate 1 is elongated, and the lower plastic 4 has a main body portion 41 conforming to the shape of the cover plate 1, and protective portions 42 at both ends of the main body portion 41 along its length. A snap-fit ​​portion 5 is provided between each protective portion 42 and the cover plate 1, and a clearance hole 4111 is provided on the main body portion 41 corresponding to the snap-fit ​​portion 5. The pole post 11 is used to connect with the pole tab 2 of the pole group 3. Each protective portion 42 can be folded onto the main body portion 41 and connected to the cover plate 1 via the snap-fit ​​portion 5. After snapping, the protective portion 42 abuts against the side of the pole tab 2 at the corresponding end facing away from the cover plate 1.

[0053] The main body 41 has an abutment protrusion 411 protruding away from the cover plate 1. A clearance hole 4111 passes through the abutment protrusion 4111. The protective part 42 abuts against the abutment protrusion 411 after being engaged with the cover plate 1. The engaging part 5 includes a buckle 52 on the protective part 42 and an engaging hole 51 on the cover plate 1. The clearance hole 4111 is provided corresponding to the engaging hole 51. The buckle 52 includes four sub-buckles 521 arranged circumferentially along the engaging hole 51. Each sub-buckle 521 has a connecting block 5211 connected to the protective part 42 and an engaging block 5212 protruding radially outward from the connecting block 5211. The buckle 52 is engaged with the cover plate 1 by the engaging block 5212.

[0054] The snap-fit ​​hole 51 includes a first snap-fit ​​hole 511 and a second snap-fit ​​hole 512 that are connected to each other. The diameter of the first snap-fit ​​hole 511 is smaller than the diameter of the second snap-fit ​​hole 512. The connecting block 5211 is inserted into the first snap-fit ​​hole 511, and the snap-fit ​​block 5212 is snapped into the second snap-fit ​​hole 512. The snap-fit ​​hole 51 is a blind hole provided on the cover plate 1, and the diameter of the clearance hole 4111 is larger than the diameter of the first snap-fit ​​hole 511. The clearance hole 4111 has an outwardly expanding guide surface 41111 at the end away from the cover plate 1. The guide surface 41111 is used to guide the buckle 52 through the clearance hole 4111. The main body part 41 and the protective part 42 are integrally formed. The main body part 41 has a plate body and a connecting rib 43 protruding to one side of the plate body. The connecting rib 43 is connected to the protective part 42, and the connecting rib 43 is provided with a rubber reduction groove 431.

[0055] In the preferred embodiment of the above cover plate assembly, the specific configuration and arrangement of the cover plate 1, the main body 41, the protective part 42 and the connecting rib 43, etc., can still be referred to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 1, the main body 41, the protective part 42 and the connecting rib 43, etc., can also be referred to the description in the above exemplary embodiments.

[0056] The cover plate assembly of this embodiment adopts the above design. By setting a protective part 42 that can be folded onto the main body 41 and can be snapped into the main body 41, the protective part 42 after snapping can abut against the side of the corresponding end of the tab 2 facing away from the cover plate 1, thereby playing the role of shaping and fixing the tab 2, preventing the tab 2 from being inserted into the electrode group 3 and causing an internal short circuit in the battery, which is beneficial to improving the battery safety performance.

[0057] The second aspect of this application also provides a cover plate assembly, the overall structure of which is the same as that of the first aspect embodiment, the difference being that the cover plate assembly structure of this embodiment is as follows: Figure 14 as well as Figure 15 As shown, the main body 41 and the protective part 42 are integrally formed. The protective part 42 includes a protective plate for abutting the electrode tab 2 and a connecting ear 6 connected to the main body 41. The connecting ear 6 protrudes to one side of the protective plate and has a hollow hole 61.

[0058] This design, with the perforated hole 61 on the connecting ear 6, reduces the rigidity of the connecting ear 6, making the protective plate easier to bend. This facilitates the smooth folding of the protective plate onto the main body 41 and its snap-fit ​​connection with the cover plate 1 during assembly. Simultaneously, the one-piece molding of the main body 41 and the protective part 42 simplifies the process, reduces manufacturing difficulty, controls manufacturing costs, and ultimately facilitates mass production.

[0059] In specific implementation, the perforated hole 61 in this embodiment can be one located on the connecting ear 6. Furthermore, two or more perforated holes 61 can also be provided in this embodiment, which will not be elaborated further. Related structures not mentioned in this embodiment, such as the abutting protrusion 411, the buckle 52, and related advantages, can be referred to the relevant structures in the first embodiment, which will not be elaborated further.

[0060] An embodiment of the third aspect of this application provides a battery having a cover assembly as described above on its casing.

[0061] The battery in this embodiment, by providing the battery pack housing structure as described above on the housing, can prevent the tabs 2 from being inserted backwards into the electrode group 3 and causing a short circuit, which is beneficial to improving the battery safety performance.

[0062] 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 principle of this application should be included within the protection scope 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 lower plastic has a main body portion that conforms to the shape of the cover plate, and protective portions at both ends of the main body portion along its length. A snap-fit ​​portion is provided between each of the protective portions and the cover plate, and a clearance hole is provided on the main body portion corresponding to the snap-fit ​​portion. The pole post is used to connect with the tabs of the pole group. Each of the protective parts can be folded onto the main body and connected to the cover plate through the snap-fit ​​part. After snapping, the protective part abuts against the side of the corresponding end of the tab that is away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The main body is provided with an abutting protrusion that protrudes to the side away from the cover plate, and the abutting protrusion is provided through the clearance hole; The protective part snaps into the cover plate and abuts against the abutment protrusion.

3. The cover plate assembly according to claim 1, 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.

4. The cover plate assembly according to claim 3, characterized in that: The buckle includes a plurality of sub-buckles spaced circumferentially along the snap-fit ​​hole, each sub-buckle having a connecting block connected to the protective part, and a snap-fit ​​block protruding radially outward from the connecting block. The buckle is secured to the cover plate by the snap-fit ​​block.

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

6. The cover plate assembly according to claim 5, 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.

7. The cover plate assembly according to claim 3, characterized in that: The end of the clearance hole away from the cover plate is provided with an outwardly expanding guide surface, which is used to guide the buckle through the clearance hole.

8. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The main body and the protective part are integrally formed. The main body has a plate and a connecting rib protruding to one side of the plate. The connecting rib is connected to the protective part, and the connecting rib is provided with a glue-reducing groove.

9. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The main body and the protective part are integrally formed. The protective part includes a protective plate for abutting the electrode tab and a connecting ear connected to the main body. The connecting lug protrudes to one side of the protective plate and has a perforated 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.

Images