Cover plate assembly and battery

Abstract

The application 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 column and a lower plastic arranged on the cover plate. The lower plastic comprises a main body, a protection body and a bending part arranged between the protection body and the main body. The protection body can be folded to one side of the pole column connected with the pole lug through the bending part, and the protection body is connected with the cover plate through a clamping part, so that the protection body abuts against one side of each pole lug away from the cover plate. The cover plate assembly can fold the protection body on the lower plastic to one side of the pole column connected with the pole lug, so as to separate the pole lug from the pole group and clamp the pole lug between the protection body and the cover plate. Meanwhile, the protection body is connected with the cover plate through the clamping part, so that the shape and position of the pole lug are fixed, the scattered pole lug is prevented from being inserted into the pole group in reverse, internal short circuit of the pole group is avoided, 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 battery manufacturing, the cover plate assembly, as a key component of the battery casing, directly affects the battery's safety and stability through its structural design. The battery cover plate typically has terminals for connecting the internal electrode assembly, which is then welded to the terminals via tabs. The welding quality between the tabs and the terminals on the cover plate directly impacts the battery's electrical performance and safety. Currently, after the welding process between the tabs and the battery cover plate, there is a common technical problem of inconsistent tab shapes and dispersed distribution, making it easy for the tabs to be inserted backwards into the electrode assembly during subsequent assembly. If a tab is inserted backwards into the electrode assembly, it will directly cause a short circuit within the electrode assembly, resulting in localized overheating inside the battery. This not only affects the battery's charge / discharge performance and lifespan but also poses a serious safety hazard. Utility Model Content

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

[0004] 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, the pole post is used to connect with the pole lug of the pole group, and there are multiple pole posts spaced apart along the length of the cover plate. The lower plastic has a main body that conforms to the shape of the cover plate, a protective body located at one end of the main body along its length, and a bent portion located between the protective body and the main body. The protective body and the cover plate are provided with a snap-fit ​​part, and the main body is provided with a clearance hole corresponding to the snap-fit ​​part. The protective body can be folded onto the main body through the bending part and connected to the cover plate through the snap-fit ​​part. After snapping, the protective body abuts against the side of the plurality of electrode tabs facing away from the cover plate.

[0005] Furthermore, a hollow area is provided in the middle of the main body along 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 part and the second abutting part abut against the electrode lugs on the pole posts at both ends, and the snap-fit ​​part is provided between the cover plate and the first abutting part and the second abutting part.

[0006] Furthermore, the snap-fit ​​portion includes a buckle provided on one of the protective body and the cover plate, and a snap-fit ​​hole provided on the other of the protective body and the cover plate; the clearance hole is provided corresponding to the snap-fit ​​hole.

[0007] Furthermore, the buckle includes two sub-buckles arranged opposite each other, each sub-buckle having a connecting block connected to the protective body, 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.

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

[0011] 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 is provided with a glue-reducing groove.

[0012] Furthermore, the main body and the protective body are integrally formed. The protective body 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 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 abut against the side of the electrode tab facing the electrode assembly, thereby separating the electrode tab from the electrode assembly. At the same time, the protective body is connected to the cover through the snap-fit ​​part, 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 the scattered electrode tabs from being inserted into the electrode assembly and causing a short circuit inside the electrode assembly, thereby improving the safety of the battery.

[0014] (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, the first and second abutting parts can abut against different tabs respectively, and both the first and second abutting parts are provided with snap-fit ​​parts between themselves and the cover plate, increasing the connection points between the protective body and the cover plate, ensuring that the first and second abutting parts fully abut against the corresponding tabs, thereby improving the fixing effect of the protective body on the tabs.

[0015] (3) The combination of buckle and snap-fit ​​hole facilitates the connection and disassembly of the protective body and the cover plate. At the same time, the corresponding clearance hole allows the buckle to pass through the main body and directly connect to the cover plate, avoiding interference between the main body and the protective body and the cover plate, and ensuring the connection effect between the protective body and the cover plate.

[0016] (4) By setting up the sub-clamps, the snap-fit ​​holes can push against the snap-fit ​​blocks of each sub-clamp, causing the connecting blocks of each sub-clamp to bend and converge towards the center of the snap-fit ​​hole and insert into the snap-fit ​​hole. Subsequently, the snap-fit ​​blocks on each sub-clamp can hook into the snap-fit ​​hole, realizing the engagement of the buckle and the snap-fit ​​hole. The two sub-clamps form a double snap-fit ​​of the snap-fit ​​hole, which can prevent the connection failure caused by the breakage of a single buckle, thus having better reliability. Compared with the setting of a single buckle, it can reduce the operating force required for the snap-fit ​​part to a certain extent. At the same time, since the cover plate itself has a certain thickness and good structural strength, setting the snap-fit ​​hole on the cover plate can ensure the reliability of the snap-fit ​​hole structure, thereby ensuring the connection effect of the snap-fit ​​part.

[0017] (5) By setting the first and second locking holes, the connecting block can play a preliminary positioning role after being inserted into the first locking hole, and form a radial limit when the locking block is engaged in the second locking hole, thereby effectively preventing the buckle from coming out along the axial or radial direction. Setting the second locking hole to a larger diameter can provide a larger locking space for the locking block, which can increase the contact area between the two and thus improve the locking firmness between the protective part and the main body.

[0018] (6) By setting the snap-fit ​​hole as a blind hole, while accommodating the snap-fit ​​and achieving connection between the snap-fit ​​and the snap-fit ​​hole, compared to a through hole, it can prevent the electrolyte inside the battery from leaking to the outside of the battery through the snap-fit ​​hole, thus ensuring the normal operation of the battery. By setting the diameter of the clearance hole to be larger than that of the first snap-fit ​​hole, it prevents the snap-fit ​​from rubbing against the main body and causing damage to the main body.

[0019] (7) The abutting protrusion abuts against the protective body, so that the main body, that is, the cover plate and the protective body form a fixed area for the electrode lug to pass through, so as to clamp the electrode lug between the protective body and the cover plate, while ensuring the fixing effect of the electrode lug, and preventing the electrode lug from being damaged by excessive pressure. At the same time, the abutting protrusion can also serve as a reinforcing structure, improve the structural strength around the clearance hole, and further ensure the structural strength of the main body.

[0020] (8) 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.

[0021] (9) The perforated design can reduce stress concentration during folding or under stress, and prevent fatigue cracking between the main body and the protective body due to repeated folding. It can also reduce the weight of the lower plastic without significantly affecting the strength, which is beneficial for the lightweight design of the battery.

[0022] This application also proposes a battery in which the casing is provided with a cover assembly as described above.

[0023] 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

[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 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 This is a schematic diagram of the lower plastic structure described in the embodiments of this application; Figure 4 for Figure 1 A sectional view at the location shown in AA; Figure 5 for Figure 4 A magnified view of the location shown in B; Figure 6 for Figure 4 A magnified view of the position shown in C; Figure 7 for Figure 4A magnified view of the location shown in D; Figure 8 This is a schematic diagram of the cover plate assembly when the electrode tab and the electrode post are connected according to an embodiment of this application; Figure 9 This is a schematic diagram of the cover plate assembly after the protective body is snapped into place, as described in an embodiment of this application. Figure 10 for Figure 9 A cross-sectional view at the location shown in EE; Figure 11 for Figure 10 Enlarged view of the position shown in F; Figure 12 for Figure 10 A magnified view of the location indicated by G in the middle; Figure 13 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 14 for Figure 13 A cross-sectional view at the location indicated by HH in the middle; Figure 15 This is a schematic diagram of one embodiment of the cover plate assembly described in this application. Figure 16 for Figure 15 Enlarged view of point I in the middle; Figure 17 This is a structural schematic diagram of another embodiment of the cover plate assembly described in this application; Figure 18 for Figure 17 Enlarged view of point J in the middle; Figure 19 This is a schematic diagram of another embodiment of the cover plate assembly after the protective body is snapped into place according to the embodiments of this application; Figure 20 This is a schematic diagram illustrating another embodiment of the cover plate assembly described in this application, connected to the pole group in place. Figure 21 for Figure 20 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; 2012. Abutting protrusion; 202. Protective body; 2021. First contact part; 2022. Protective part; 2023. Second contact part; 2024. Vent; 203. Protective cavity; 2031. Notch; 3. Electrode assembly; 301. Electrode tab; 4. Buckle; 401. Sub-buckle; 402. Reinforcing component; 4011. Connecting block; 4012. Snap-fit ​​block; 5. Snap-fit ​​hole; 501. First snap-fit ​​hole; 502. Second snap-fit ​​hole; 6. Clearance hole; 7. Connecting ribs; 701. Glue-reducing groove; 8. Connecting ear; 801. 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.

[0032] In related technologies, the battery cover plate 1 is typically provided with terminal posts 101 for connecting the internal electrode assembly 3 of the battery. The internal electrode assembly 3 is welded to the terminal posts 101 via tabs 301. After the welding process is completed, there is a problem that the tabs 301 have different shapes and are relatively scattered, making it very easy for the tabs 301 to be inserted backwards into the electrode assembly 3 during subsequent assembly. This can lead to a short circuit inside the electrode assembly 3, causing localized overheating inside the battery, affecting the battery's charge and discharge performance and lifespan, and also posing a serious safety hazard.

[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 3 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.

[0034] Among them, combined Figure 8 , Figure 9 and Figure 10 As shown, the cover plate 1 is elongated, the pole post 101 is used to connect with the pole lug 301 of the pole group 3, and there are multiple pole posts spaced apart along the length of the cover plate 1. The lower plastic 2 has a main body 201 that conforms to the shape of the cover plate 1, a protective body 202 located at one end of the main body 201 along the length, and a bent portion located between the protective body 202 and the main body 201.

[0035] Furthermore, continue to combine Figures 13 to 14 As shown, a snap-fit ​​part is provided between the protective body 202 and the cover plate 1. The main body 201 is provided with clearance holes 6 corresponding to the snap-fit ​​part. The protective body 202 can be folded onto the main body 201 through the bending part and connected to the cover plate 1 through the snap-fit ​​part. After snapping, the protective body 202 abuts against the side of the multiple tabs 301 facing away from the cover plate 1.

[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, thereby separating the tab 301 from the electrode group 3. At the same time, the protective body 202 is connected to the cover plate 1 through the snap-fit ​​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 the scattered tabs 301 from being inserted into the electrode group 3 and causing a short circuit inside the electrode group 3, thereby improving the safety of the battery.

[0037] Based on the above general introduction, 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, the two pole posts 101 are respectively connected to two tabs 301 of different polarities in the same pole group 3.

[0038] In some of the exemplary implementations, combined with Figure 1 and Figure 3 As shown, the main body 201 has a hollow area 2011 in the middle of its length direction. 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 abut against the tabs 301 on the two end posts 101 respectively, and a snap-fit ​​part is provided between the cover plate 1 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 can abut against different tabs 301 respectively. Furthermore, both the first and second abutting portions 2023 and the cover plate 1 have locking parts, increasing the connection points between the protective body 202 and the cover plate 1. This ensures that the first and second abutting portions 2023 fully abut against the corresponding tabs 301, thereby improving the fixing effect of the protective body 202 on the tabs 301.

[0040] In practical implementation, the first abutting portion 2021 has a bent portion on one side and multiple snap-fit ​​portions distributed along the width direction of the cover plate 1 on the other side. The second abutting portion 2023 has multiple snap-fit ​​portions on both sides along the length direction of the cover plate 1, with each snap-fit ​​portion spaced apart along the width direction. This not only increases the number of connection points between the protective body 202 and the cover plate 1 but also improves the contact area between the protective body 202 and the electrode tab 301 in the width direction, further enhancing the fixing effect on the electrode tab 301.

[0041] In addition, the protective part 2022 protrudes to the side away from the main body 201 to form a groove structure, and an elongated vent 2024 is provided on the bottom wall of the groove structure. When the battery experiences thermal runaway and the electrode group 3 generates a large amount of gas, the gas can pass through the vent 2024 and be discharged through the explosion-proof valve to further ensure the safety of the battery.

[0042] In some of the exemplary implementations, combined with Figure 4As shown, the snap-fit ​​part includes a snap fastener 4 provided on one of the protective body 202 and the cover plate 1, and a snap-fit ​​hole 5 provided on the other of the protective body 202 and the cover plate 1. A clearance hole 6 is provided corresponding to the snap-fit ​​hole 5.

[0043] The combination of buckle 4 and snap-fit ​​hole 5 facilitates the connection and disassembly of the protective body 202 and the cover plate 1. At the same time, the corresponding clearance hole 6 allows the buckle 4 to pass through the main body 201 and directly connect to the cover plate 1, avoiding interference from the main body 201 with the connection between the protective body 202 and the cover plate 1, thus ensuring the connection effect between the protective body 202 and the cover plate 1.

[0044] In some of the exemplary implementations, combined with Figure 5 , Figure 6 and Figure 11 As shown, the buckle 4 includes two sub-buckles 401 arranged opposite to each other. Each sub-buckle 401 has a connecting block 4011 connected to the protective body 202, and a snap-fit ​​block 4012 protruding radially outward from the connecting block 4011. The snap-fit ​​hole 5 is provided on the cover plate 1, and the buckle 4 is snapped onto the cover plate 1 by the snap-fit ​​block 4012.

[0045] By setting the sub-clamps 401, the snap-fit ​​holes 5 can push against the snap-fit ​​blocks 4012 of each sub-clamp 401, causing the connecting blocks 4011 of each sub-clamp 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-clamp 401 can hook into the snap-fit ​​hole 5, realizing the engagement of the buckle 4 and the snap-fit ​​hole 5. The two sub-clamps 401 form a double snap-fit ​​of the snap-fit ​​hole 5, which can prevent the connection failure caused by the breakage of a single buckle 4, thus having better reliability. Compared with the setting of a single buckle 4, it can reduce the operating force required for the snap-fit ​​part to a certain extent. At the same time, since the cover plate 1 itself has a certain thickness and good structural strength, setting the snap-fit ​​hole 5 on the cover plate 1 can ensure the reliability of the snap-fit ​​hole 5 structure, thereby ensuring the connection effect of the snap-fit ​​part.

[0046] In specific implementation, at the root of the connecting block 4011 of the two separate buckles 401, that is, at the end of the connecting block 4011 near the protective body 202, a reinforcing member 402 is provided between the two connecting blocks 4011. The reinforcing member prevents the connecting block 4011 from being excessively bent and breaking off from the protective body 202 when the buckle 4 is connected to the snap hole 5, thereby improving the structural strength and reliability of the buckle 4.

[0047] In some of the exemplary implementations, combined with Figure 6 , Figure 11As shown, 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. 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.

[0048] By setting the first locking hole 501 and the second locking hole 502, the connecting block 4011 can play a preliminary positioning role after being inserted into the first locking hole 501. When the locking block 4012 is engaged in the second locking hole 502, a radial limit is formed, which can effectively prevent the buckle 4 from coming out axially or radially. Setting the second locking hole 502 to a larger diameter can provide a larger locking space for the locking block 4012, which can increase the contact area between the two and thus improve the locking firmness between the protective part 2022 and the main body 201.

[0049] In some exemplary embodiments, the snap-fit ​​hole 5 is a blind hole provided on the cover plate 1. By making the snap-fit ​​hole 5 a blind hole, while accommodating the snap-fit ​​4 and enabling the snap-fit ​​4 to connect with the snap-fit ​​hole 5, compared to a through hole, it can prevent the electrolyte inside the battery from leaking to the outside of the battery through the snap-fit ​​hole 5, thus ensuring the normal operation of the battery. At the same time, the diameter of the clearance hole 6 is larger than the diameter of the first snap-fit ​​hole 501. By setting the diameter of the clearance hole 6 to be larger than the first snap-fit ​​hole 501, it prevents the snap-fit ​​4 from rubbing against the body 201 and causing damage to the body 201.

[0050] In some exemplary embodiments, the main body 201 has an abutment protrusion 2012 protruding away from the cover plate 1, and the clearance hole 6 passes through the abutment protrusion 2012. The protective body 202 is engaged with the cover plate 1 and abuts against the abutment protrusion 2012. By setting the abutment protrusion 2012, the abutment protrusion 2012 can abut against the protective body 202, so that the main body 201, that is, the cover plate 1 and the protective body 202 form a fixed area for the electrode tab 301 to pass through, so as to clamp the electrode tab 301 between the protective body 202 and the cover plate 1, ensuring the fixing effect of the electrode tab 301 while preventing the electrode tab 301 from being damaged by excessive pressure. At the same time, the abutment protrusion 2012 can also serve as a reinforcing structure, improving the structural strength around the clearance hole 6, and further ensuring the structural strength of the main body 201.

[0051] In practical implementation, the inner side of the abutment protrusion 2012, that is, the outer edge of the clearance hole 6, forms an arc-shaped guide angle. By setting the guide angle, the buckle 4 can be guided to be inserted into the clearance hole 6, and then the buckle 4 can be guided to be inserted into the snap-fit ​​hole 5, so as to facilitate the snap-fit ​​operation between the buckle 4 and the snap-fit ​​hole 5.

[0052] In some of the exemplary implementations, such as Figure 4 , Figure 7 and Figure 12As shown, the main body 201 and the protective body 202 are integrally formed. The main body 201 has a plate and a connecting rib 7 protruding to one side of the plate. The connecting rib 7 is connected to the protective body 202, and the connecting rib 7 is provided with a reducing groove 701. Integrating the main body 201 and the protective body 202 into one piece can improve the overall production efficiency of the lower plastic 2 and the cover plate assembly. At the same time, by setting the connecting rib 7, the strength and rigidity of the connection between the main body 201 and the protective body 202 can be enhanced while the protective body 202 is folded. The reducing groove 701 provides a certain degree of flexibility to the connection between the connecting rib 7 and the protective body 202, and when the protective body 202 is folded relative to the main body 201, the reducing groove 701 can provide a certain deformation space for the connection, avoiding difficulty in folding or damage to the connection due to excessive rigidity.

[0053] Furthermore, in some of the exemplary implementations, combined with Figure 15 and Figure 16 As shown, the main body 201 and the protective body 202 are integrally formed. The protective body 202 includes a protective plate for abutting the tab 301 and a connecting ear 8 connected to the main body 201. The protective plate has the aforementioned first and second abutting portions and protective portion 2022. The connecting ear 8 protrudes to one side of the protective plate and has a perforated hole 801. In addition to improving the overall production efficiency of the lower plastic 2 and the cover assembly, the perforated hole 801 can reduce stress concentration during folding or under stress, preventing fatigue cracking between the main body 201 and the protective body 202 due to repeated folding. It can also reduce the weight of the lower plastic part without significantly affecting the strength, which is beneficial for the lightweight design of the battery.

[0054] In specific implementation, the perforated hole 801 in this embodiment is an elongated hole extending along the width direction of the cover plate 1. Of course, it can also be a plurality of perforated holes 801 spaced apart along the width direction of the cover plate 1.

[0055] In addition, when applying it, it can also be like... Figures 17 to 21 As shown, a recessed protective cavity 203 is provided on the first abutting portion 2021 and the second abutting portion 2023. After the protective body 202 is folded over and connected to the cover plate 1, the protective cavity 203 protrudes from the protective body 202 toward the electrode assembly 3, and the protective cavity 203 is located below the welding position of the electrode post 101 and the electrode tab 301.

[0056] The protective cavity 203 is designed to catch any debris and residue that falls off the tab 301 and is generated during welding. This prevents debris and residue from falling between the electrodes of the electrode assembly 3 and damaging them, thus ensuring the normal operation of the battery.

[0057] Specifically, both the first abutting portion 2021 and the second abutting portion 2023 are provided with a notch 2031 located at the edge of the opening end of the protective cavity 203, which is used for the flow of electrolyte. The protective cavity 203 is rectangular in shape, and multiple notches 2031 are provided at intervals on each edge of the protective cavity 203.

[0058] Furthermore, the depth of the protective cavity 203 is less than the distance between the protective portion 2022 of the tab 301 after bending and the electrode assembly 3, thereby creating a certain gap between the protective cavity 203 and the electrode assembly 3. Simultaneously, as another implementation, the opening area of ​​the notch 2031 can be enlarged to give the protective cavity 203 a certain degree of elasticity. Moreover, the depth of the protective cavity 203 is made equal to the distance between the protective portion 2022 of the tab 301 after bending and the electrode assembly 3, so that the protective cavity 203 abuts against the electrode assembly 3. Therefore, when the electrode assembly 3 shakes up and down, the protective cavity 203 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.

[0059] 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 14 As shown.

[0060] The cover plate assembly of this embodiment includes a cover plate 1 through which the pole post 101 passes, and a lower plastic 2 disposed on the cover plate 1.

[0061] The cover plate 1 is elongated and has two pole posts 101 inserted through it. The two pole posts 101 are located at opposite ends of the cover plate 1 along its length, and are respectively connected to two tabs 301 of different polarities in the same pole group 3. The lower plastic 2 has a main body 201 conforming to the shape of the cover plate 1, a protective body 202 located at one end of the main body 201 along its length, and a bent portion located between the protective body 202 and the main body 201.

[0062] Furthermore, a snap-fit ​​part is provided between the protective body 202 and the cover plate 1. Corresponding to the snap-fit ​​part, the main body 201 is provided with a clearance hole 6. The protective body 202 can be folded onto the main body 201 through the bending part and connected to the cover plate 1 through the snap-fit ​​part. After snapping, the protective body 202 abuts against the side of the multiple tabs 301 facing away from the cover plate 1.

[0063] Specifically, the main body 201 has a hollow area 2011 in the middle of its length direction. 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. The protective part 2022 is provided corresponding to the hollow area 2011. The first abutting part 2021 and the second abutting part 2023 abut against the tabs 301 on the two end poles 101 respectively, and a snap-fit ​​part is provided between the cover plate 1 and the first abutting part 2021 and the second abutting part.

[0064] Meanwhile, the first abutting portion 2021 has a bent portion on one side and multiple snap-fit ​​portions distributed along the width direction of the cover plate 1 on the other side. The second abutting portion 2023 has multiple snap-fit ​​portions on both sides along the length direction of the cover plate 1, with each snap-fit ​​portion spaced apart along the width direction. Furthermore, the protective portion 2022 protrudes away from the main body 201 to form a groove structure, and an elongated vent hole 2024 is provided on the bottom wall of the groove structure.

[0065] Furthermore, the snap-fit ​​part includes a snap-fit ​​hole 5 on the protective body 202 and a snap fastener 4 on the cover plate 1. The snap fastener 4 includes two opposing snap fasteners 401, each of which has a connecting block 4011 connected to the protective body 202 and a snap-fit ​​block 4012 protruding radially outward from the connecting block 4011. The snap-fit ​​hole 5 is located on the cover plate 1, and the snap fastener 4 is snapped onto the cover plate 1 by the snap fastener block 4012. A reinforcing member 402 is provided at one end of the connecting block 4011 of the two snap fasteners 401 near the protective body 202, and the reinforcing member 402 is connected between the two connecting blocks 4011.

[0066] Additionally, the main body 201 has an abutment protrusion 2012 protruding away from the cover plate 1. A clearance hole 6 passes through the abutment protrusion 2012, and the clearance hole 6 forms an arc-shaped guide angle on its outer edge. A snap-fit ​​hole 5 is a blind hole on the cover plate 1, corresponding to the clearance hole 6. The snap-fit ​​hole 5 includes a first snap-fit ​​hole 501 and a second snap-fit ​​hole 502 that are connected. The diameter of the first snap-fit ​​hole 501 is 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.

[0067] Furthermore, the main body 201 and the protective body 202 are integrally formed. The main body 201 has a plate and a connecting rib 7 protruding to one side of the plate. The connecting rib 7 is connected to the protective body 202, and the connecting rib 7 is provided with a glue-reducing groove 701.

[0068] In this embodiment, the cover assembly adopts the design described above. 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, thereby separating the tab 301 from the electrode assembly 3. Simultaneously, the protective body 202 is connected to the cover 1 via a snap-fit ​​portion, so that the tab 301 is clamped between the protective body 202 and the cover 1, thus fixing the shape and position of the tab 301. This prevents the scattered tabs 301 from being inserted backwards into the electrode assembly 3, causing an internal short circuit in the electrode assembly 3, thereby improving battery safety.

[0069] An embodiment of the second aspect of this application provides a battery having a cover assembly as described above on its casing.

[0070] 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, avoiding the situation where the tab 301 is inserted upside down into the electrode group 3, reducing the risk of short circuit in the electrode group 3 inside the battery, thereby improving the safety of the battery.

[0071] 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, the pole post is used to connect with the pole lug of the pole group, and there are multiple pole posts spaced apart along the length of the cover plate. The lower plastic has a main body that conforms to the shape of the cover plate, a protective body located at one end of the main body along its length, and a bent portion located between the protective body and the main body. The protective body and the cover plate are provided with a snap-fit ​​part, and the main body is provided with a clearance hole corresponding to the snap-fit ​​part. The protective body can be folded onto the main body through the bending part and connected to the cover plate through the snap-fit ​​part. After snapping, the protective body 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 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 electrode lugs on the two ends of the pole post, and the locking portion is provided between the cover plate and the first abutting portion and the second abutting portion.

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 body and the cover plate, and a snap-fit ​​hole provided on the other of the protective body 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 two sub-buckles arranged opposite each other, each sub-buckle having a connecting block connected to the protective body, 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.

5. The cover plate assembly according to claim 4, 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 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 clearance hole is provided through the abutting protrusion; The protective body engages with the cover plate and then abuts against the abutment protrusion.

8. The cover plate assembly according to any one of claims 1 to 7, 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 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 body are integrally formed. The protective body 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.

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