Cover plate assembly and battery

Abstract

The application relates to the battery technical field and provides a cover plate assembly and a battery. The cover plate assembly of the application is applied to a battery shell and comprises a cover plate provided with a pole column and a lower plastic arranged on the cover plate. The cover plate is provided with a liquid injection hole, the lower plastic comprises a body, the body is provided with a liquid outlet groove corresponding to the liquid injection hole, and a liquid outlet hole is arranged at the bottom of the liquid outlet groove. In the axial direction of the liquid injection hole, the liquid outlet hole is arranged staggeredly with the liquid injection hole. The cover plate assembly of the application can avoid the direct flushing of electrolyte to the pole piece and the diaphragm when the electrolyte is injected into the battery, so that the risk of internal short circuit of the battery is avoided, and the safety performance of the battery is improved.

Description

Technical Field

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

[0002] With the rapid development of the electric vehicle industry, research on electric vehicle battery technology is increasing and deepening. In the current battery structure, the cell includes tabs, which are welded to terminals passing through a cover plate to achieve electrical connection. However, in existing battery electrode assemblies, after the tabs are welded to the cover plate, when electrolyte is injected into the battery, the electrolyte directly washes over the electrode plates and separator, posing a risk of internal short circuits and affecting the battery's safety performance. Utility Model Content

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

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0005] A cover assembly for use on a battery casing includes a cover through which terminals are passed and a lower plastic layer disposed on the cover.

[0006] The cover plate is provided with an injection hole, and the lower plastic includes a body. The body is provided with an outlet groove corresponding to the injection hole, and an outlet hole at the bottom of the outlet groove. The outlet hole and the injection hole are staggered in the axial direction of the injection hole.

[0007] Furthermore, the body is formed with protrusions that protrude along the thickness direction of the body; the liquid outlet groove is provided on the protrusions, and the protrusions are provided with drain holes located on the side wall of the liquid outlet groove.

[0008] Furthermore, the protrusion is provided with a raised ring along the edge of the liquid outlet hole; and / or, the liquid outlet hole is a plurality of holes spaced apart circumferentially along the protrusion.

[0009] Furthermore, a mounting groove is formed inwardly on the first side of the cover plate in the thickness direction, and the injection hole is located at the bottom of the mounting groove; the mounting groove is used to install a plugging plate to seal the injection hole.

[0010] Furthermore, the second side of the cover plate in the thickness direction is provided with an annular groove, and the annular groove is arranged circumferentially along the mounting groove.

[0011] Furthermore, the pole post is used to connect with the electrode tab of the electrode assembly, and a protective body is provided on the lower plastic; the protective body can be folded to one side in the thickness direction of the body, and the folded protective body blocks the side of the electrode tab that is opposite to the cover plate.

[0012] Furthermore, the protective body is provided with a support protrusion, which abuts against the main body after the protective body is flipped over.

[0013] 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 relative to the protective plate and has a hollow hole arranged along its length.

[0014] Furthermore, the main body is provided with notches located on both sides of the connecting ear along its length.

[0015] Compared with related technologies, this application has the following advantages:

[0016] (1) The cover plate assembly of this application has an outlet groove on the lower plastic body that corresponds to the injection hole and an outlet hole at the bottom of the outlet groove. The outlet hole and the injection hole are staggered in the axial direction of the injection hole. This can avoid the risk of the electrolyte directly washing the electrode and separator when the electrolyte is injected into the battery, which could cause the battery to have an internal short circuit.

[0017] (2) By forming a protrusion along the thickness direction of the body on the body, and setting the liquid outlet groove on the protrusion, and providing a drain hole on the side wall of the liquid outlet groove on the protrusion, the structural strength of the body can be improved, and the influence of the setting of the drain hole on the strength of the body can be reduced. In addition, the drain hole can also allow the electrolyte to flow out from the drain hole on the side when the liquid outlet hole at the bottom is blocked, ensuring the electrolyte wetting effect on the battery.

[0018] (3) By setting a convex ring along the edge of the liquid outlet hole on the protrusion, and setting multiple liquid outlet holes at intervals along the circumference of the protrusion, the electrolyte can be dispersed, preventing the electrolyte from concentrating and scouring the electrode and separator, causing damage to the electrode and separator, resulting in internal short circuit, which is beneficial to improving the battery safety performance.

[0019] (4) By forming an installation groove in the first side of the cover plate in the thickness direction, and setting the liquid injection hole at the bottom of the installation groove, and the installation groove is used to install the plug plate that seals the liquid injection hole, it can facilitate the installation of the plug plate, and its structure is simple and easy to implement. It can also cooperate with the plug plate to improve the sealing ability of the plug plate, effectively prevent liquid or air from seeping into the battery, and help improve the battery's service life.

[0020] (5) An annular groove is provided on the second side of the cover plate in the thickness direction. In the thickness direction of the cover plate, the annular groove is set along the edge of the mounting groove, which can enhance the structural strength while reducing the weight of the cover plate. It is also beneficial to improve the processing quality of the cover plate.

[0021] (6) By allowing the protective body to fold to one side of the body thickness direction, and with the folded protective body positioned on the side of the tab facing away from the cover plate, the protective body can play a role in shaping and fixing the tab, effectively preventing the tab from being inserted into the electrode assembly and causing an internal short circuit in the battery, thus improving the battery's safety performance. (7) The protective body is provided with a support protrusion, which abuts against the body after the protective body is flipped, thus limiting the protective body and preventing it from being excessively folded and squeezed, causing the tab to deform and resulting in battery failure, thereby improving battery safety. At the same time, it can also prevent foreign objects such as welding slag at the welding position from puncturing the separator and causing an internal short circuit in the battery, thus further improving the battery's safety performance.

[0022] (8) By molding the body and the protective body into one piece, and the protective body including a protective plate for abutting the electrode tab and a connecting ear connected to the body, the connecting ear protrudes relative to the protective plate and has a hollow hole along its length, the rigidity of the connecting ear can be reduced, making the protective plate easier to bend and facilitating the smooth folding of the protective plate to abut the body during assembly. At the same time, the one-piece molding of the body and the protective body also helps to simplify the process flow, reduce manufacturing difficulty, thereby controlling manufacturing costs and facilitating large-scale production.

[0023] (9) The body has notches on both sides of the connecting ear along the length direction, which can further weaken the rigidity of the connecting ear, making the protective plate easier to bend and easier to assemble and install.

[0024] Another object of this application is to provide a battery having a cover assembly as described in any of the preceding claims.

[0025] The battery described in this application, through the cover plate assembly as described above, can prevent the electrolyte from directly washing over the electrode plates and separator when the electrolyte is injected into the battery, thus avoiding the risk of internal short circuits. The protective body can also play a role in shaping and fixing the tabs, preventing the tabs from being inserted into the electrode assembly in reverse and causing internal short circuits in the battery, which is beneficial to improving the safety performance of the battery. Attached Figure Description

[0026] 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:

[0027] Figure 1 This is a schematic diagram of the cover plate assembly described in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the cover plate assembly described in an embodiment of this application from another perspective;

[0029] Figure 3 for Figure 2 A partial view at point A in the middle;

[0030] Figure 4 for Figure 2 A partial view at point B in the middle;

[0031] Figure 5 This is a cross-sectional view of the cover plate assembly described in an embodiment of this application;

[0032] Figure 6 for Figure 5 A partial view at point C in the middle;

[0033] Figure 7 This is a schematic diagram of the cover plate assembly described in an embodiment of this application in another state;

[0034] Figure 8 This is a cross-sectional view of the cover plate assembly described in an embodiment of this application in another state;

[0035] Figure 9 for Figure 8 A partial view at point D;

[0036] Figure 10 for Figure 8 A partial view at point E in the middle;

[0037] Figure 11 This is a schematic diagram of the structure of the cover plate assembly described in the second aspect embodiment of this application;

[0038] Figure 12 This is a schematic diagram of the mating structure of the limiting post and the limiting hole; Explanation of the reference numerals:

[0039] 100. Cover plate; 101. Injection hole; 102. Mounting groove; 103. Annular groove;

[0040] 200. Lower plastic part; 201. Body; 2011. Protrusion; 20111. Liquid outlet groove; 20112. Liquid outlet hole; 20113. Drain hole; 20114. Protruding ring; 2012. Notch; 2013. Perforated pole; 2014. Explosion-proof valve vent hole; 2015. Limiting post;

[0041] 202. Protective body; 2021. Protective plate; 20211. Support protrusion; 20212. Limiting hole; 2022. Connecting lug; 20221. Hole;

[0042] 300, pole. Detailed Implementation

[0043] 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.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The first aspect of this application provides a cover plate assembly, which is mainly used in batteries. The cover plate assembly of this embodiment, through its innovative structural design, can prevent the electrolyte from directly washing over the electrode plates and separator when the electrolyte is injected into the battery, thus avoiding the risk of internal short circuits in the battery and improving the safety performance of the battery.

[0050] In related technologies, with the rapid development of the electric vehicle industry, research on electric vehicle battery technology is increasing and constantly expanding and deepening.

[0051] In current battery structures, a cell includes tabs, which are welded to terminals that pass through a cover plate to achieve electrical connection. However, in existing battery electrode assemblies, after the tabs are welded to the cover plate, when electrolyte is injected into the battery, the electrolyte directly washes over the electrode plates and separator, posing a risk of internal short circuits and affecting battery safety and performance.

[0052] 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 10 As shown, the overall design includes a cover plate 100 through which the pole post 300 passes, and a lower plastic 200 disposed on the cover plate 100.

[0053] The cover plate 100 is provided with a liquid injection hole 101, and the lower plastic 200 includes a body 201. The body 201 is provided with a liquid outlet groove 20111 corresponding to the liquid injection hole 101, and a liquid outlet hole 20112 provided at the bottom of the liquid outlet groove 20111. The liquid outlet hole 20112 is staggered from the liquid injection hole 101 in the axial direction.

[0054] Therefore, by arranging the outlet hole 20112 and the injection hole 101 separately in the axial direction of the injection hole 101, it is possible to avoid the electrolyte directly washing the electrode and separator when injecting electrolyte into the battery, which could lead to internal short circuits and other risks, thus improving the safety performance of the battery.

[0055] Based on the above general introduction, specifically, in some exemplary embodiments, the cover plate assembly of this embodiment is composed of... Figures 1 to 10 As shown, it generally includes a tab, a pole post 300, an explosion-proof valve vent 2014, and a pole post perforation 2013.

[0056] The above-mentioned tabs and terminals 300 can be derived from the relevant structures in existing batteries. The explosion-proof valve vent 2014 is used to facilitate the venting of the explosion-proof valve, and the terminal through hole 2013 is used for the terminal 300 to pass through. Their structures can be derived from the conventional forms in existing batteries, and will not be described in detail here.

[0057] Combination Figure 2 , Figure 3 , Figure 5 as well as Figure 6As shown, in some exemplary embodiments, a protrusion 2011 is formed on the body 201, protruding along the thickness direction of the body 201. A liquid outlet groove 20111 is provided on the protrusion 2011, and a drain hole 20113 is provided on the side wall of the protrusion 20111. This arrangement improves the structural strength of the body 201 and also reduces the impact of the drain hole 20113 on the strength of the body 201. Furthermore, the drain hole 20113 on the side wall allows electrolyte to flow out when the bottom liquid outlet 20112 is blocked, ensuring effective electrolyte wetting of the battery.

[0058] In specific implementation, the protrusion 2011 in this embodiment is cylindrical in shape and is located on the side of the body 201 away from the cover plate 100. The protrusion 2011 protrudes along the thickness direction of the body 201. The electrolyte outlet groove 20111 in this embodiment is located on the side of the body 201 near the cover plate 100 and is coaxially arranged with the protrusion 2011, recessed into the side of the body 201 away from the cover plate 100. This buffers the injected electrolyte, preventing it from directly washing over the electrodes and separator, thus avoiding internal short circuits and further improving battery safety.

[0059] The drain holes 20113 on the side wall of the liquid outlet tank 20111 are preferably four spaced apart circumferentially along the protrusion 2011. In specific implementations, the drain holes 20113 can also be five or more, but this may weaken the structural strength of the protrusion 2011 and increase the manufacturing cost of the lower plastic 200. Of course, the number of drain holes 20113 can be adaptively adjusted according to the diameter of the protrusion 2011, as long as the electrolyte can flow out from the drain holes 20113 on the side when the bottom drain hole 20112 is blocked, thus ensuring the electrolyte wettability of the battery.

[0060] Similarly combined Figure 2 , Figure 3 , Figure 5 as well as Figure 6 In some exemplary embodiments, the protrusion 2011 is provided with a raised ring 20114 disposed along the edge of the liquid outlet hole 20112, and the liquid outlet hole 20112 is a plurality of holes spaced apart circumferentially along the protrusion 2011. This arrangement can disperse the electrolyte, prevent the electrolyte from concentrating and washing over the electrode and separator, causing damage to the electrode and separator, resulting in internal short circuit, and thus improving the battery safety performance.

[0061] In specific implementation, the height of the convex ring 20114 in this embodiment should be between 0.4mm and 1.0mm, preferably 0.6mm, to ensure both uniform liquid flow and structural strength of the convex ring 20114. The liquid outlet hole 20112 in this embodiment, combined with... Figure 3 As shown, there are five electrolyte outlet holes 20111 spaced circumferentially along the protrusion 2011. Of course, there can also be four or three, which can also serve to provide electrolyte flow channels. It should be noted that there should be no fewer than two outlet holes 20112 to prevent electrolyte from accumulating in the outlet tank 20111, which could lead to backflow or scouring of the electrode plates and separator, affecting production safety and battery safety.

[0062] Combination Figure 1 , Figure 5 as well as Figure 6 As shown, in some exemplary embodiments, a mounting groove 102 is recessed on the first side of the cover plate 100 in the thickness direction. An injection hole 101 is located at the bottom of the injection groove 102, and the mounting groove 102 is used to install a plugging plate to seal the injection hole 101. The advantage of this design is that it facilitates the installation of the plugging plate, has a simple structure for easy implementation, and can cooperate with the plugging plate to improve its sealing ability, effectively preventing liquid or air from seeping into the battery, thus improving battery lifespan.

[0063] In specific implementation, the cover plate 100 of this embodiment is made entirely of plain aluminum plate. This ensures the structural strength of the cover plate 100 while facilitating its lightweight design, thereby contributing to the overall lightweight design of the battery. The mounting groove 102 on the cover plate 100 is recessed on the first side of the cover plate 100 in the thickness direction, i.e., on the side of the cover plate 100 away from the lower plastic 200. The sidewall of the mounting groove 102 is designed to gradually slope downwards along the thickness direction of the cover plate 100. The electrolyte injection hole 101 is coaxially arranged with the mounting groove 102 to facilitate the injection of electrolyte.

[0064] Furthermore, it is worth mentioning that the blocking plate described in this embodiment can refer to the relevant structures of blocking plates well known to those skilled in the art, and will not be described in detail here.

[0065] Combination Figure 6 As shown, in some exemplary embodiments, an annular groove 103 is provided on the second side of the cover plate 100 in the thickness direction, and the annular groove 103 is arranged circumferentially along the mounting groove 102. In this way, the weight of the cover plate 100 can be reduced while enhancing the structural strength, which also helps to improve the processing quality of the cover plate 100.

[0066] In a specific implementation, the annular groove 103 of this embodiment is located on the second side of the cover plate 100 in the thickness direction, that is, on the side of the cover plate 100 close to the lower plastic 200. It is formed by stamping and has a depth between 0.15mm and 0.3mm to leave a safety gap to avoid the protrusion 2011 and the avoidance groove on the lower plastic 200.

[0067] Combination Figures 1 to 2 As shown, in some exemplary embodiments, the pole post 300 is used to connect to the pole tab of the pole group, and the lower plastic 200 is provided with a protective body 202. The protective body 202 can be folded to one side of the body 201 in the thickness direction, and the folded protective body 202 blocks the side of the pole tab that is away from the cover plate 100.

[0068] This design allows the protective body 202 to shape and fix the tabs, effectively preventing the tabs from being inserted backwards into the electrode assembly and causing an internal short circuit in the battery, thus improving the battery's safety performance.

[0069] Furthermore, in specific implementation, the cover plate 100 is elongated, the electrode posts 300 are two spaced apart along the length of the cover plate 100, the body 201 is conformed to the shape of the cover plate 100, and the protective bodies 202 are two located at both ends of the body 201 along its length. This arrangement simplifies the structure of the cover plate 100, making it easier to design and implement, and also enhances the protection of the electrode posts 300, thus contributing to improved battery safety performance.

[0070] Combination Figure 2 , Figure 7 , Figure 9 as well as Figure 10 As shown, in some exemplary embodiments, the protective body 202 is provided with a support protrusion 20211, which abuts against the main body 201 after the protective body 202 is flipped. This arrangement limits the movement of the protective body 202, preventing excessive folding and compression of the tabs, which could lead to tab deformation and battery malfunction, thus improving battery safety. Simultaneously, it also prevents foreign objects such as welding slag at the welding location from puncturing the separator and causing internal short circuits, further enhancing battery safety performance.

[0071] In specific implementation, the support protrusion 20211 is cylindrical. Of course, the support protrusion 20211 can also take other shapes, as long as it can meet the requirement of abutting against the main body 201 after the protective body 202 is flipped over, and can limit the protective body 202 to prevent it from being excessively folded and squeezed, causing the electrode tab to deform, which is conducive to improving battery safety. It will not be elaborated further here.

[0072] Combination Figure 2 , Figure 7 as well as Figure 10 As shown, in some exemplary embodiments, the body 201 and the protective body 202 are integrally formed. The protective body 202 includes a protective plate 2021 for abutting the electrode tab and a connecting ear 2022 connected to the body 201. The connecting ear 2022 protrudes relative to the protective plate 2021 and has a hollow hole 20221 arranged along its length direction.

[0073] This reduces the rigidity of the connecting ear 2022, making the protective plate 2021 easier to bend and allowing it to be easily folded and abutted against the body 201 during assembly. Simultaneously, the one-piece molding of the body 201 and the protective plate 202 simplifies the process, reduces manufacturing difficulty, controls manufacturing costs, and facilitates mass production.

[0074] In specific implementation, the perforated hole 20221 in this embodiment can be one located on the connecting ear 2022 and arranged along its length. Furthermore, the perforated hole 20221 in this embodiment can also be two, three, or four spaced apart along the length of the connecting ear 2022. The specific number and arrangement can be adaptively adjusted according to the length of the connecting ear 2022, as long as the rigidity of the connecting ear 2022 is reduced, making the protective plate 2021 easier to bend and facilitating smooth folding of the protective plate 2021 to abut against the body 201 during assembly.

[0075] Furthermore, it is worth mentioning that the connecting ear 2022 in this embodiment can also be a connecting rib protruding to one side of the plate. The connecting rib is connected to the protective body 202, and the connecting rib is provided with a reducing groove along the length of the connecting rib. It can also reduce the rigidity of the connecting part, thereby facilitating the smooth folding of the protective plate 2021 and its contact with the body 201 during the assembly process.

[0076] Combination Figure 4 As shown, in some exemplary embodiments, the body 201 has notches 2012 on both sides of the connecting ear 2022 along its length. This further reduces the rigidity of the connecting ear 2022, making the protective plate 2021 easier to bend and facilitating assembly and fitting.

[0077] 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 10 As shown, it may include, for example, a cover plate 100 through which the pole post 300 passes, and a lower plastic 200 disposed on the cover plate 100.

[0078] The cover plate 100 is provided with a liquid injection hole 101, and the lower plastic 200 includes a body 201. The body 201 is provided with a liquid outlet groove 20111 corresponding to the liquid injection hole 101, and a liquid outlet hole 20112 provided at the bottom of the liquid outlet groove 20111. The liquid outlet hole 20112 is staggered from the liquid injection hole 101 in the axial direction.

[0079] The body 201 has a protrusion 2011 formed on it, which protrudes along the thickness direction of the body 201. A liquid outlet groove 20111 is provided on the protrusion 2011, and a drain hole 20113 is provided on the side wall of the liquid outlet groove 20111. A raised ring 20114 is provided on the protrusion 2011 along the edge of the liquid outlet hole 20112, and multiple liquid outlet holes 20112 are spaced apart circumferentially along the protrusion 2011. A mounting groove 102 is formed recessed on the first side of the cover plate 100 in the thickness direction. A liquid injection hole 101 is provided at the bottom of the liquid injection groove of the mounting groove 102. The mounting groove 102 is used to install a plugging plate to seal the liquid injection hole 101.

[0080] The cover plate 100 has an annular groove 103 on its second side in the thickness direction, and the annular groove 103 is located along the edge of the mounting groove 102 when viewed in the thickness direction of the cover plate 100. The pole post 300 is used to connect with the pole tab of the pole assembly. A protective body 202 is provided on the lower plastic 200. The protective body 202 can be folded to one side in the thickness direction of the main body 201, and the folded protective body 202 blocks the side of the pole tab facing away from the cover plate 100. The protective body 202 has a support protrusion 20211, which abuts against the main body 201 after the protective body 202 is folded.

[0081] The main body 201 and the protective body 202 are integrally formed. The protective body 202 includes a protective plate 2021 for abutting the electrode tabs and a connecting ear 2022 connected to the main body 201. The connecting ear 2022 protrudes relative to the protective plate 2021 and has a perforated hole 20221 along its length. The main body 201 has notches 2012 on both sides of the connecting ear 2022 along its length.

[0082] In the preferred embodiment of the above cover plate assembly, the specific configuration and arrangement of the cover plate 100, the lower plastic 200, the injection hole 101, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 100, the lower plastic 200, and the injection hole 101, etc., can also be referred to the descriptions in the above exemplary embodiments.

[0083] The cover plate assembly of this embodiment adopts the above design. By arranging the outlet hole 20112 and the injection hole 101 separately in the axial direction of the injection hole 101, it can avoid the electrolyte directly washing the electrode and separator when injecting electrolyte into the battery, which may cause the battery to have internal short circuits and other risks, thus improving the safety performance of the battery.

[0084] The second aspect of this application also provides a cover plate assembly, the overall structure of which is the same as the cover plate assembly provided in the first aspect embodiment, the only difference being: [the following is a description of the assembly's construction and its connection to the first aspect embodiment]. Figure 11 As shown, the support protrusion 20211 is also provided with a limiting hole 20212, which is coaxially arranged with the support protrusion 20211. The main body 201 is also provided with a limiting post 2015 that cooperates with the limiting hole 20212. When the support protrusion 20211 abuts against the main body 201 after the protective body 202 is flipped, the limiting post 2015 can enter the limiting hole 20212 to limit the protective body 202.

[0085] Furthermore, the aforementioned limiting post 2015 can also be a thermoplastic post well-known to those skilled in the art. This ensures the reliable connection between the body 201 and the protective body 202, preventing loosening. Simultaneously, its simple structure and ease of implementation also contribute to improved production efficiency.

[0086] An embodiment of the second aspect of this application also provides a battery having a cover assembly as described in any of the preceding claims.

[0087] In this embodiment, the battery, by providing the cover plate assembly described in the first aspect embodiment, can avoid the electrolyte directly washing over the electrode plates and separator when the electrolyte is injected into the battery, thus preventing the risk of internal short circuits. The protective body 202 can also play a role in shaping and fixing the tabs, preventing the tabs from being inserted into the electrode assembly in reverse and causing internal short circuits in the battery, which is beneficial to improving the safety performance of the battery.

[0088] 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 provided with an injection hole, and the lower plastic includes a body. The body is provided with an outlet groove corresponding to the injection hole, and an outlet hole at the bottom of the outlet groove. The outlet hole and the injection hole are staggered in the axial direction of the injection hole.

2. The cover plate assembly according to claim 1, characterized in that: The body has protrusions formed on it, and the protrusions protrude along the thickness direction of the body; The liquid outlet groove is provided on the protrusion, and the protrusion has a drain hole located on the side wall of the liquid outlet groove.

3. The cover plate assembly according to claim 2, characterized in that: The protrusion is provided with a raised ring along the edge of the liquid outlet hole; and / or The liquid outlet holes are a plurality of holes spaced apart circumferentially along the protrusion.

4. The cover plate assembly according to claim 1, characterized in that: The first side of the cover plate in the thickness direction is recessed to form an installation groove, and the liquid injection hole is located at the bottom of the installation groove; The mounting groove is used to install a plugging plate that seals the injection hole.

5. The cover plate assembly according to claim 4, characterized in that: The cover plate has an annular groove on its second side in the thickness direction, and the annular groove is arranged around the circumference of the mounting groove.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The pole post is used to connect with the pole lug of the pole assembly, and a protective body is provided on the lower plastic; The protective body can be folded to one side in the thickness direction of the main body, and the folded protective body blocks the side of the electrode tab that is opposite to the cover plate.

7. The cover plate assembly according to claim 6, characterized in that: The protective body is provided with a support protrusion, which abuts against the main body after the protective body is flipped over.

8. The cover plate assembly according to claim 6, 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 ear protrudes relative to the protective plate and has a hollow hole along its length.

9. The cover plate assembly according to claim 8, characterized in that: The main body is provided with notches on both sides along the length of the connecting ear.

10. A battery, characterized in that: The battery is provided with a cover plate assembly as described in any one of claims 1 to 9.

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