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, an abutting body arranged on one side of the main body, and a connecting portion arranged between the abutting body and the main body. The main body is provided with a liquid injection cavity and an exhaust cavity which are arranged at intervals, and a via hole between the liquid injection cavity and the exhaust cavity, the via hole being used for allowing the pole column connected with a pole lug to pass through. The abutting body is arranged between the liquid injection cavity and the exhaust cavity, the abutting body can be folded on the main body and connected with the main body through the connecting portion, and the connected abutting body can abut against one side of the pole lug which is opposite to the pole column. The cover plate assembly can effectively avoid the loosening of a welding position caused by the shaking and displacement of the pole lug in the subsequent process of the battery, thereby improving the stability of the battery, and can effectively prevent the short circuit caused by the reverse insertion of the pole lug into a pole group, thereby improving the safety of the battery.

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 existing technologies, after the battery tabs are welded to the cover plate terminals, the welded tabs often wobble, shift, or even loosen during subsequent use, transportation, and storage. This problem not only weakens the battery's stability but may also cause internal connection failures, thus adversely affecting the overall performance of the battery. In extreme cases, it can even cause the tabs to be inserted backwards into the electrode assembly, posing a safety risk such as a short circuit. Utility Model Content

[0003] In view of this, this application aims to provide a cover plate assembly that can fix the tabs after they are connected to the terminal post, thereby improving the stability and safety of the battery structure.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover assembly for use on a battery casing includes a cover through which terminals are passed and a lower plastic material disposed on the cover. The lower plastic includes a main body, an abutment body disposed on one side of the main body in the width direction, and a connecting portion disposed between the abutment body and the main body; The cover plate body is provided with an injection chamber and an exhaust chamber spaced apart, and a through hole located between the injection chamber and the exhaust chamber. The through hole is used for the electrode post connected to the electrode tab to pass through. The abutment is disposed between the injection chamber and the exhaust chamber. The abutment can be folded onto the main body and connected to the main body through the connecting part. The connected abutment can abut against the side of the electrode tab that is opposite to the electrode post.

[0005] Furthermore, the main body and the abutment body are integrally formed; A rubber-reducing groove is provided at the end of the abutment body that connects to the main body.

[0006] Furthermore, the cover plate and the lower plastic are elongated strips arranged according to their shape, and the poles are multiple ones spaced apart along the length of the cover plate; The connected abutment can block one end of the axial direction of the plurality of pole posts and simultaneously abut against the plurality of pole tabs.

[0007] Furthermore, the cover plate is provided with an injection hole communicating with the injection chamber, and the bottom of the injection chamber is provided with multiple outlet holes; The plurality of liquid outlet holes and the liquid injection holes are offset from each other in the axial direction of the liquid injection holes.

[0008] Furthermore, the main body is provided with a first protrusion and a second protrusion protruding away from the cover plate; The injection chamber is located on the first protrusion, and the venting chamber is located on the second protrusion.

[0009] Furthermore, one side of the main body in the thickness direction has a limiting protrusion located between the first protrusion and the second protrusion, and the abutment is connected to the limiting protrusion; The electrode tab can be inserted between the first protrusion and the second protrusion from the other side of the main body, and the limiting protrusion can abut against the electrode tab to limit the insertion displacement of the electrode tab.

[0010] Furthermore, the connecting portion includes a snap-fit ​​post disposed on one of the main body and the abutting body, and a snap-fit ​​hole disposed on the other of the main body and the abutting body; The snap-fit ​​pin can snap into the snap-fit ​​hole.

[0011] Furthermore, the injection cavity is provided with a plurality of interwoven first reinforcing ribs, which divide the injection cavity into a plurality of sub-cavities, and the height of the first reinforcing ribs should be less than the height of the injection cavity; and / or, The exhaust chamber is provided with a plurality of interwoven second reinforcing ribs, and the plurality of second reinforcing ribs divide the exhaust chamber into a plurality of gas distribution chambers, and the height of the second reinforcing ribs should be less than the height of the exhaust chamber.

[0012] Furthermore, the abutment body is provided with an adhesive that can bond the abutment body to the electrode tab.

[0013] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application provides an abutment on the lower plastic and a connecting part between the abutment and the main body. This allows the abutment to be folded onto the main body and connected to the main body via the connecting part, abutting against the side of the tab opposite to the pole post. This provides stable support for the tab and effectively prevents the tab from loosening due to shaking or displacement during subsequent battery operation, thereby improving the stability of the battery. At the same time, it can also effectively prevent the tab from being inserted backward into the electrode assembly, thus improving the safety of the battery.

[0014] In addition, by placing the contact body between the injection chamber and the venting chamber and corresponding to the position of the through hole, the protection function of the electrode tab can be achieved without occupying extra space, making the layout of each component of the cover plate assembly compact and improving the integration of the overall structure.

[0015] (2) Molding the main body and the abutment body in one piece can reduce the assembly process and also help ensure the stability of the connection between the abutment body and the main body, avoiding problems such as breakage during long-term use. By setting a rubber reduction groove at one end of the connection between the abutment body and the main body, the thickness and structural strength of the connection part can be effectively weakened, making the abutment body easier to fold, thereby improving assembly efficiency.

[0016] (3) By setting multiple terminals spaced apart along the length of the cover plate, and allowing the connected abutment to simultaneously abut against multiple tabs, the number of parts can be reduced and the assembly complexity lowered compared to setting a separate protective structure for each tab. At the same time, the uniform abutment applies a more uniform abutment force to multiple tabs, which can effectively prevent any tab from shaking or loosening, thus ensuring the stable connection between each terminal and tab and reducing the fluctuation of the overall battery performance caused by abnormalities in individual connection parts.

[0017] (4) By setting multiple injection holes on the cover plate, it is convenient to inject electrolyte into the battery casing and the injection rate of electrolyte can be reduced. At the same time, multiple outlet holes disperse the injection pressure to different positions, avoiding excessive local pressure and reducing the risk of damage to the internal structure of the battery due to pressure impact. The outlet holes and injection holes are staggered in the axial direction of the injection holes to prevent the electrolyte from directly impacting the electrode assembly and causing damage to the electrode assembly.

[0018] (5) By setting a first protrusion and a second protrusion on the main body, and setting the liquid injection chamber on the first protrusion and the venting chamber on the second protrusion, the liquid injection chamber and the venting chamber can have a large volume, which can better buffer the liquid injection pressure and the venting pressure, and further reduce the risk of damage to the internal structure of the battery caused by pressure impact.

[0019] (6) By setting a limiting protrusion, when the electrode tab is inserted between the first protrusion and the second protrusion from the other side of the main body, the limiting protrusion abuts against the electrode tab, which can limit its insertion displacement, prevent the electrode tab from being inserted too deep or too shallow, and help ensure that the electrode tab quickly reaches the preset installation position, thereby helping to ensure the accuracy of the connection between the electrode tab and the terminal post and improve the reliability of the battery electrical connection.

[0020] (7) The connecting part adopts a matching structure of snap-fit ​​pins and snap-fit ​​holes. When the abutment is folded onto the main body, simply align the snap-fit ​​pins with the snap-fit ​​holes and apply appropriate external force to complete the snap-fit ​​fixation of the two. The operation is simple and does not require additional tools or complicated procedures, which can significantly improve the assembly efficiency of the cover plate assembly. At the same time, the snap-fit ​​structure has good self-locking performance and can form a stable connection, which can effectively prevent the abutment from separating from the main body and ensure that the abutment is continuously and reliably abutted against the tab, thereby further ensuring the stability and safety of the battery.

[0021] (8) By setting multiple first reinforcing ribs in the injection cavity, the overall structural strength of the injection cavity can be significantly improved, reducing the risk of deformation and cracking of the cavity due to stress, which is conducive to ensuring the injection function. Similarly, by setting multiple second reinforcing ribs in the venting cavity, the overall structural strength of the venting cavity can be improved, reducing the risk of deformation and cracking of the cavity due to stress, which is conducive to ensuring the venting function.

[0022] (9) By setting the adhesive on the contact body, the contact body and the electrode can be bonded together, so that the two form a tighter connection. This can further effectively prevent relative sliding or separation between the contact body and the electrode, thereby further preventing the electrode from shaking or shifting due to loss of effective restraint, and further improving the stability and safety of the battery.

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

[0024] The battery described in this application, by setting the cover plate assembly as described above, can provide stable support for the tabs, which can effectively prevent the tabs from loosening due to shaking or displacement during subsequent battery processes, thereby improving the stability of the battery. At the same time, it can also effectively prevent the tabs from being inserted backward into the electrode assembly and causing a short circuit, thereby improving the safety of the battery. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the cover plate assembly described in an embodiment of this application from a first-view perspective; Figure 2 This is a schematic diagram of the cover plate assembly described in an embodiment of this application from a second perspective; Figure 3 This is a schematic diagram of the cover plate assembly described in an embodiment of this application from a third-person perspective; Figure 4 A cross-sectional view of a battery having the cover plate assembly described in the embodiments of this application; Figure 5 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a first-view perspective; Figure 6 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a second perspective; Figure 7 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a third-view perspective; Figure 8 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a fourth perspective; Figure 9 This is a schematic diagram of the lower plastic material described in the embodiments of this application from a fifth-angle perspective.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Lower plastic; 201. Main body; 2011. Through hole; 2012. Limiting protrusion; 2013. First protrusion; 20131. Liquid outlet; 20132. First reinforcing rib; 2014. Second protrusion; 20141. Vent hole; 20142. Second reinforcing rib; 2015. Snap-fit ​​post; 202. Abutment body; 2021. Snap-fit ​​hole; 3. Pole post; 4. Explosion-proof valve; 5. Electrode assembly; 501. Electrode tab; M, injection chamber; N, exhaust chamber; K, Glue Reduction Groove. 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] An embodiment of the first aspect of this application provides a cover plate assembly that can fix the tab 501 after it is connected to the terminal post 3, thereby improving battery stability and safety.

[0034] In related technologies, after the welding process of battery tab 501 and cover plate 1 pole 3 is completed, whether it is the frequent charge and discharge cycle during daily use, the bumps and vibrations encountered during transportation, or the changes in environmental stress during long-term storage, the welded tab 501 is very prone to slight shaking, or even loosening, which will cause the electrical connection of the welded part to break or have poor contact, and reduce the overall stability of the battery structure.

[0035] Furthermore, any movement or displacement of tab 501 can lead to malfunctions in the battery's internal connection system. For example, the welding point between tab 501 and terminal 3 may develop micro-cracks due to repeated stress, gradually increasing contact resistance. This not only reduces the battery's energy conversion efficiency but also causes localized overheating, significantly impacting the overall battery performance. When tab 501 becomes loose and inverted, contacting terminal group 5, it directly breaks the battery's internal insulation design. As a critical component for current conduction, tab 501, when inverted, may contact terminal group 5 of different polarity, instantly creating a short circuit, generating a large amount of heat, and causing problems such as battery bulging and leakage. In extreme cases, the high temperature generated by the short circuit may even ignite the electrolyte inside the battery, causing a fire or even an explosion, greatly reducing battery safety.

[0036] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly in this embodiment combines... Figures 1 to 4 As shown, the overall design includes a cover plate 1 through which the pole post 3 passes, and a lower plastic 2 disposed on the cover plate 1. The lower plastic 2 includes a main body 201, an abutment 202 disposed on one side of the main body 201 in the width direction, and a connecting portion disposed between the abutment 202 and the main body 201.

[0037] The main body 201 has an injection chamber M and an exhaust chamber N spaced apart, and a through hole 2011 located between the injection chamber M and the exhaust chamber N. The through hole 2011 is used for the electrode post 3 connected to the electrode tab 501 to pass through. The abutment 202 is located between the injection chamber M and the exhaust chamber N. The abutment 202 can be folded onto the main body 201 and connected to the main body 201 through a connecting part. After connection, the abutment 202 can abut against the side of the electrode tab 501 opposite to the electrode post 3.

[0038] Therefore, by providing an abutment 202 on the lower plastic 2 and a connecting part between the abutment 202 and the main body 201, the abutment 202 can be folded onto the main body 201 and connected to the main body 201 via the connecting part, abutting against the side of the tab 501 opposite to the terminal post 3. This provides stable support for the tab 501, effectively preventing the welding points from loosening due to shaking or displacement of the tab 501 during subsequent battery operation, thereby improving battery stability. Simultaneously, it also effectively prevents the tab 501 from being inserted backwards into the electrode assembly 5, thus improving battery safety.

[0039] In addition, by placing the abutment 202 between the injection chamber M and the venting chamber N, and corresponding to the position of the through hole 2011, the protection function of the tab 501 can be achieved without occupying extra space, making the layout of each component of the cover plate assembly compact and improving the integration of the overall structure.

[0040] Based on the above overview, specifically, let's continue to combine... Figures 1 to 3 As shown, in some exemplary embodiments, the cover plate 1 and the lower plastic 2 are elongated strips arranged in a conformal manner, and the pole posts 3 are a plurality of pole posts spaced apart along the length direction of the cover plate 1. Furthermore, the connected abutment body 202 can block one end of the plurality of pole posts 3 along their axial direction and simultaneously abut against the plurality of tabs 501.

[0041] By adopting a conformal elongated design for the cover plate 1 and the lower plastic 2, it can better adapt to the multiple pole posts 3 that are spaced apart along the length of the cover plate 1, allowing for a more orderly layout of the multiple pole posts 3. Furthermore, the connected abutment body 202 can be placed on one side of the multiple pole posts 3 and simultaneously abut against the multiple tabs 501, achieving synchronous protection and fixation of the multiple tabs 501.

[0042] Compared to setting up separate protective structures for each individual tab 501, this design simplifies the contact system, reduces the number of parts, and lowers assembly complexity. Simultaneously, the unified contact body 202 applies a stable contact force to multiple tabs 501, preventing uneven force distribution and ensuring consistent stability at the welding points between all tabs 501 and the pole post 3. This significantly improves the protection efficiency and effectiveness for multiple tabs 501.

[0043] In specific implementation, it can be as follows: Figures 1 to 9 As shown, the cover plate 1 is rectangular, which can serve as either a positive or negative electrode cover. The lower plastic 2 is rectangular and conforms to the shape of the cover plate 1. Two electrode posts 3 are spaced apart along the length of the cover plate 1. The tabs 501 on the electrode assembly 5 are correspondingly positioned one-to-one with the two electrode posts 3, and the two tabs 501 are welded to the two electrode posts 3. The lower plastic 2 is typically sandwiched between the electrode posts 3 and the cover plate 1; its installation structure is readily available in existing technologies. This embodiment focuses on describing the structure of the lower plastic 2. Furthermore, the lower plastic 2 can be made of the insulating material commonly used in existing batteries, and no specific limitations are specified here.

[0044] It should be noted that, similar to existing technology, this cover plate assembly includes, in addition to the aforementioned pole 3 and lower plastic 2, an upper plastic 2 located on the other side of the cover plate 1, a riveting block riveted to the pole 3, and a sealing element located between the pole 3 and the cover plate 1. The upper plastic 2 serves to insulate the riveting block and the cover plate 1, while the sealing element provides a seal and insulation between the cover plate 1 and the pole 3. The arrangement of the components is consistent with existing technology and will not be elaborated further here. This embodiment focuses on describing the lower plastic 2 and the insulating element.

[0045] In some exemplary embodiments, the main body 201 and the abutment 202 are integrally formed, and a reducing groove K is provided at the end where the abutment 202 connects to the main body 201. Here, by integrally forming the main body 201 and the abutment 202, the complex processes and assembly errors caused by assembling multiple parts can be effectively avoided, the number of connection steps and parts can be reduced, and the manufacturing of the lower plastic 2 can be made more efficient.

[0046] By providing a reducing groove K at the end where the abutment 202 connects to the main body 201, meaning the thickness of the abutment 202 at the location of the reducing groove K is less than the thickness at other locations, a certain degree of flexibility is achieved at the connection between the abutment 202 and the main body 201. When the abutment 202 is bent relative to the main body 201, the reducing groove K provides a certain deformation space at the connection. This effectively avoids bending difficulties or damage to the connection due to excessive rigidity, making the bending operation of the abutment 202 smoother, while ensuring a stable abutment effect between the abutment 202 and the tab 501 after engagement.

[0047] In specific implementation, combined with Figures 4 to 9As shown, the main body 201 has through holes 2011 corresponding to the two pole posts 3, and the two through holes 2011 are spaced apart along the length of the main body 201 to allow the pole posts 3 to pass through. An abutment body 202 is located on one side of the main body 201 in the width direction and is a rectangle extending along the length of the main body 201. The length of the abutment body 202 is greater than the distance between the two through holes 2011, so that it can simultaneously abut against the two tabs 501 connected to the two pole posts 3. Furthermore, to facilitate bending of the abutment body 202, both sides of the abutment body 202 in the thickness direction are provided with adhesive reduction grooves K, and each adhesive reduction groove K extends through the abutment body 202 along its length.

[0048] In some exemplary embodiments, the connecting part includes a snap-fit ​​post 2015 provided on one of the main body 201 and the abutment body 202, and a snap-fit ​​hole 2021 provided on the other of the main body 201 and the abutment body 202, and the snap-fit ​​post 2015 can snap into the snap-fit ​​hole 2021. Thus, when the abutment body 202 is folded onto the main body 201, simply aligning the snap-fit ​​post 2015 with the snap-fit ​​hole 2021 and applying appropriate external force can complete the snap-fit ​​fixation of the two, which is simple to operate. At the same time, the snap-fit ​​structure has good self-locking performance. Once the snap-fit ​​post 2015 is snapped into the snap-fit ​​hole 2021, a stable connection can be formed, effectively ensuring that the abutment body 202 continuously and reliably abuts against the tab 501.

[0049] Moreover, compared to other connection methods (such as bolted connections, welding, etc.), the structural design of the snap-fit ​​post 2015 and snap-fit ​​hole 2021 does not require additional connecting parts. They can be integrally formed on the main body 201 and the abutment body 202, which can reduce the number of parts. At the same time, when it is necessary to inspect or replace internal parts, the snap-fit ​​can be easily released, which can improve the convenience of later maintenance.

[0050] In specific implementation, such as Figure 6 As shown, for example, the snap-fit ​​post 2015 can be provided on the main body 201, and the snap-fit ​​hole 2021 can be provided on the abutment body 202. This facilitates the driving of the snap-fit ​​post 2015 out of the body, making maintenance easier. Furthermore, relative to the end of the abutment body 202 connected to the main body 201, the snap-fit ​​hole 2021 is provided at the other end of the abutment body 202, and there are two such holes at both ends along the length of the abutment body 202. The snap-fit ​​post 2015 and the snap-fit ​​hole 2021 are provided in a one-to-one correspondence, and the end of the snap-fit ​​post 2015 has a snap-fit ​​protrusion that protrudes radially outward. Simultaneously, the free end of the snap-fit ​​protrusion has an initiating inclined surface that initiates its passage through the abutment body 202.

[0051] It should be noted that the location and number of the snap-fit ​​holes 2021 are not limited to... Figure 6As shown, it can be adjusted according to design requirements. Furthermore, besides having the snap-fit ​​hole 2021 on the abutment body 202 and the snap-fit ​​post 2015 on the main body 201, the snap-fit ​​hole 2021 can also be on the main body 201, while the snap-fit ​​post 2015 is on the abutment body 202. In addition to snapping the abutment body 202 and the main body 201 together, they can also be connected by other methods such as adhesive bonding.

[0052] In some exemplary embodiments, the cover plate 1 is provided with an injection hole communicating with the injection chamber M, and the bottom of the injection chamber M is provided with a plurality of outlet holes 20131. Furthermore, the plurality of outlet holes 20131 are offset from the injection hole in the axial direction of the injection hole.

[0053] Here, by providing multiple injection holes, injection chambers M, and outlet holes 20131, it is convenient to inject electrolyte into the battery casing and the injection rate of electrolyte can be reduced. Simultaneously, the multiple outlet holes 20131 distribute the injection pressure to different locations, avoiding excessive local pressure and reducing the risk of damage to the internal battery structure due to pressure impact. By offsetting the outlet holes 20131 from the injection holes axially, it prevents the electrolyte from directly impacting the electrode assembly 5 and causing damage or debris.

[0054] In specific implementation, combined with Figure 3 and Figure 8 As shown in the illustration, as an exemplary embodiment, the liquid outlet cavity is sealed at the position of the injection hole in the thickness direction of the lower plastic 2, so that the multiple liquid outlet holes 20131 are staggered from the injection hole in the axial direction of the injection hole. This prevents the electrolyte from directly entering the battery and damaging the internal structure. Furthermore, to further reduce the impact force, such as... Figure 8 As shown, multiple liquid outlet holes 20131 are provided at intervals in both the length and width directions of the liquid outlet cavity.

[0055] In addition, combined Figure 3 and Figure 8 As shown, an explosion-proof valve 4 is provided on the cover plate 1 corresponding to the exhaust chamber N. Simultaneously, multiple exhaust holes 20141 are spaced apart at the bottom of the exhaust chamber N. It can be understood that by providing the explosion-proof valve 4 on the cover plate 1 and providing the exhaust chamber N and exhaust holes 20141 corresponding to the explosion-proof valve 4 on the main body 201, the high-pressure gas inside the battery can be released in a timely manner, effectively preventing damage to the internal structure of the battery due to long-term exposure to high pressure, such as diaphragm deformation and electrode material detachment. Furthermore, as... Figure 8 As shown, in order to improve exhaust uniformity, exhaust ports 20141 can be configured as multiple ports arranged in a rectangular array.

[0056] In some exemplary embodiments, the main body 201 has a first protrusion 2013 and a second protrusion 2014 protruding away from the cover plate 1. The liquid injection chamber M is located on the first protrusion 2013, and the venting chamber N is located on the second protrusion 2014. By providing the first protrusion 2013 and the second protrusion 2014 on the main body 201, and placing the liquid injection chamber M on the first protrusion 2013 and the venting chamber N on the second protrusion 2014, the liquid injection chamber M and the venting chamber N can have a larger volume, which can better buffer the liquid injection pressure and the venting pressure, and further reduce the risk of damage to the internal structure of the battery due to pressure shock.

[0057] In specific implementation, combined with Figure 6 and Figure 7 As shown, the first protrusion 2013 and the second protrusion 2014 are, for example, two rectangular blocks located at both ends of the main body 201 along its length. Furthermore, the injection chamber M and the venting chamber N are open at one end near the cover plate 1. It should be noted that the shape and specific position of the first protrusion 2013 and the second protrusion 2014 are not limited to those shown in the figure, and can be adjusted according to design requirements.

[0058] In some of the exemplary implementations, combined with Figure 7 and Figure 8 As shown, the injection chamber M is provided with multiple interwoven first reinforcing ribs 20132, which divide the injection chamber M into multiple sub-chambers. The height of each first reinforcing rib 20132 should be less than the height of the injection chamber M. Here, by using multiple interwoven first reinforcing ribs 20132 within the injection chamber M, the overall structural strength of the injection chamber M can be improved, reducing the risk of deformation and breakage due to stress and ensuring the stable realization of the injection function. Simultaneously, the height of the first reinforcing ribs 20132 being less than the height of the injection chamber M allows for the flow of electrolyte between the multiple sub-chambers.

[0059] In specific implementation, for example, it can be like this Figure 8 As shown, a first reinforcing rib 20132 arranged along the length of the main body 201 is provided in the injection chamber M, and two first reinforcing ribs 20132 arranged along the width of the main body 201 are provided, thus dividing the injection chamber M into six sub-chambers. Of course, the number of first reinforcing ribs 20132 can be adjusted according to design requirements.

[0060] In some of the exemplary implementations, combined with Figure 7 and Figure 8As shown, multiple interwoven second reinforcing ribs 20142 are provided within the exhaust chamber N, dividing the exhaust chamber N into multiple air distribution chambers. The height of each second reinforcing rib 20142 should be less than the height of the exhaust chamber N. By providing multiple second reinforcing ribs 20142 within the exhaust chamber N, the overall structural strength of the exhaust chamber N can be improved, reducing the risk of deformation and cracking of the chamber under stress, thus ensuring the exhaust function.

[0061] In specific implementation, for example, it can be like this Figure 8 As shown, a first reinforcing rib 20132 arranged along the length of the main body 201 is provided in the exhaust chamber N, and six first reinforcing ribs 20132 arranged along the width of the main body 201 are provided, thus dividing the injection chamber M into fourteen sub-chambers. Of course, the number of first reinforcing ribs 20132 can be adjusted according to design requirements.

[0062] In some exemplary embodiments, the body 201 has a limiting protrusion 2012 on one side in the thickness direction, located between the first protrusion 2013 and the second protrusion 2014, and the abutment 202 is connected to the limiting protrusion 2012. The tab 501 can be inserted from the other side of the body 201 between the first protrusion 2013 and the second protrusion 2014, and the limiting protrusion 2012 can abut against the tab 501 to limit the insertion displacement of the tab 501.

[0063] At this point, it is understandable that by setting the limiting protrusion 2012, when the tab 501 is inserted between the first protrusion 2013 and the second protrusion 2014 from the other side of the main body 201, the limiting protrusion 2012 abuts against the tab 501, which can limit its insertion displacement and prevent the tab 501 from being inserted too deeply or too shallowly. This helps to ensure that the tab 501 quickly reaches the preset installation position, thereby ensuring the accuracy of the connection between the tab 501 and the terminal post 3 and improving the reliability of the battery electrical connection.

[0064] In practical implementation, as an exemplary structure, it is combined with Figure 5 and Figure 6 As shown, the limiting protrusion 2012 is an elongated strip located between the first protrusion 2013 and the second protrusion 2014, and its length is consistent with that of the abutment 202, in order to improve the firmness of the abutment 202 and its limiting effect. It can be understood that the limiting protrusion 2012, in addition to being... Figure 5 The elongated structure shown can also be multiple structures spaced apart along the length of the main body 201.

[0065] In some exemplary embodiments, the abutment 202 is provided with an adhesive that bonds the abutment 202 to the tab 501. By providing the adhesive and bonding the abutment 202 to the tab 501, the movement of the tab 501 can be further restricted, effectively preventing the tab 501 from loosening or falling off. Simultaneously, the adhesive can also cover the solder joint between the tab 501 and the terminal post 3, preventing weld slag from falling off and causing foreign matter in the battery. Moreover, the adhesive is convenient and quick to use, shortening assembly time and improving production efficiency. In specific implementations, the adhesive can be a pressure-sensitive adhesive or other commonly used adhesives.

[0066] 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 9 As shown, it also includes a cover plate 1, an pole post 3, a lower plastic 2, and other conventional structures.

[0067] The lower plastic component 2 includes a main body 201 and an abutment 202 located on one side of the main body 201. The main body 201 has two snap-fit ​​posts 2015, and the abutment 202 has two snap-fit ​​holes 2021. The two components can be snapped together via the snap-fit ​​posts 2015 and snap-fit ​​holes 2021. Additionally, the main body 201 has an injection chamber M and an venting chamber N spaced apart, and a through hole 2011 located between the injection chamber M and the venting chamber N. The through hole 2011 allows the electrode post 3, connected to the electrode tab 501, to pass through. The abutment 202 is located between the injection chamber M and the venting chamber N. The abutment 202 can be folded onto the main body 201 and connected to it. After connection, the abutment 202 can abut against the side of the electrode tab 501 facing away from the electrode post 3. Furthermore, the abutment 202 has an adhesive layer that bonds the abutment 202 to the electrode tab 501.

[0068] The main body 201 and the abutment body 202 are integrally formed, and a reducing groove K is provided at the end where the abutment body 202 connects to the main body 201. Furthermore, the main body 201 has a first protrusion 2013 and a second protrusion 2014 protruding away from the cover plate 1. The injection chamber M is located on the first protrusion 2013, and the venting chamber N is located on the second protrusion 2014. Additionally, the injection chamber M has multiple interwoven first reinforcing ribs 20132, and the venting chamber N has multiple interwoven second reinforcing ribs 20142.

[0069] One side of the main body 201 has a limiting protrusion 2012 located between the first protrusion 2013 and the second protrusion 2014, and the abutment body 202 is connected to the limiting protrusion 2012. The electrode tab 501 can be inserted from the other side of the main body 201 between the first protrusion 2013 and the second protrusion 2014, and the limiting protrusion 2012 can abut against the electrode tab 501 to limit the insertion displacement of the electrode tab 501.

[0070] In the above preferred embodiments, the specific structures of the cover plate 1 and the lower plastic 2 can still be referred to the descriptions in the above exemplary embodiments. In this preferred embodiment, the beneficial effects brought about by the design of the cover plate 1 and the lower plastic 2 can also be referred to the descriptions in the above exemplary embodiments.

[0071] The cover assembly of this embodiment, with the design described above, provides stable support for the tab 501, effectively preventing loosening of the welded joints due to shaking or displacement during subsequent battery operation, thereby improving battery stability. Simultaneously, it effectively prevents short circuits caused by the tab 501 being inserted backwards into the electrode assembly 5, further enhancing battery safety. Moreover, it achieves protection for the tab 501 without occupying additional space, resulting in a compact layout of all components in the cover assembly and improved overall structural integration.

[0072] An embodiment of the second aspect of this application provides a battery, the battery casing of which is provided with the cover assembly as described above.

[0073] The battery of this application, by setting the cover plate assembly as described above, can effectively prevent the welding parts of the tab 501 from becoming loose due to shaking or displacement during subsequent battery operation, thereby improving the stability of the battery. At the same time, it can also effectively prevent the tab 501 from being inserted into the electrode group 5 in reverse and causing a short circuit, thereby improving the safety of the battery.

[0074] 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 lower plastic includes a main body, an abutment body disposed on one side of the main body in the width direction, and a connecting portion disposed between the abutment body and the main body; The main body is provided with an injection chamber and an exhaust chamber spaced apart, and a through hole located between the injection chamber and the exhaust chamber, the through hole being used for the electrode post connected to the electrode tab to pass through; The abutment is disposed between the injection chamber and the exhaust chamber. The abutment can be folded onto the main body and connected to the main body through the connecting part. The connected abutment can abut against the side of the electrode tab that is opposite to the electrode post.

2. The cover plate assembly according to claim 1, characterized in that: The main body and the abutment body are integrally formed; A rubber-reducing groove is provided at the end of the abutment body that connects to the main body.

3. The cover plate assembly according to claim 1, characterized in that: The cover plate and the lower plastic are elongated strips arranged according to their shape, and the poles are multiple poles spaced apart along the length of the cover plate; The connected abutment can block one end of the axial direction of the plurality of pole posts and simultaneously abut against the plurality of pole tabs.

4. The cover plate assembly according to claim 1, characterized in that: The cover plate is provided with an injection hole communicating with the injection chamber, and the bottom of the injection chamber is provided with multiple outlet holes; The plurality of liquid outlet holes and the liquid injection holes are offset from each other in the axial direction of the liquid injection holes.

5. The cover plate assembly according to claim 1, characterized in that: The main body is provided with a first protrusion and a second protrusion that protrude away from the cover plate; The injection chamber is located on the first protrusion, and the venting chamber is located on the second protrusion.

6. The cover plate assembly according to claim 5, characterized in that: The body has a limiting protrusion on one side in the thickness direction, located between the first protrusion and the second protrusion, and the abutment is connected to the limiting protrusion; The electrode tab can be inserted between the first protrusion and the second protrusion from the other side of the main body, and the limiting protrusion can abut against the electrode tab to limit the insertion displacement of the electrode tab.

7. The cover plate assembly according to claim 1, characterized in that: The connecting part includes a snap-fit ​​post provided on one of the main body and the abutting body, and a snap-fit ​​hole provided on the other of the main body and the abutting body; The snap-fit ​​pin can snap into the snap-fit ​​hole.

8. The cover plate assembly according to claim 1, characterized in that: The injection cavity is provided with a plurality of interwoven first reinforcing ribs, and the plurality of first reinforcing ribs divide the injection cavity into a plurality of sub-cavities, and the height of the first reinforcing ribs should be less than the height of the injection cavity. And / or, The exhaust chamber is provided with a plurality of interwoven second reinforcing ribs, and the plurality of second reinforcing ribs divide the exhaust chamber into a plurality of gas distribution chambers, and the height of the second reinforcing ribs should be less than the height of the exhaust chamber.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The abutment is provided with an adhesive, which can bond the abutment to the tab.

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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