Current collector, cover plate assembly, battery, and electric device

Abstract

The application discloses a current collector, a cover plate assembly, a battery and an electric device, relates to the technical field of current collectors, and aims to solve the problems of scalding of cell diaphragms, false welding and welding-through of current collectors caused by blind welding of a current collector disc and a pole and thick penetration. The current collector comprises a current collector body, the current collector body is provided with a first connecting boss, the first connecting boss is provided with a first liquid injection hole, the first connecting boss is accommodated in a second liquid injection hole of a pole, and the second liquid injection hole is in communication with the first liquid injection hole. The current collector is connected with the second liquid injection hole of the pole through the first connecting boss arranged on the current collector body, so that the part of the first connecting boss extending into the second liquid injection hole can be welded by means of splice welding, penetration welding is replaced, and the problems of scalding of cell diaphragms and welding-through of current collectors are avoided. The current collector is used for electrically connecting with cell tabs to lead out electrodes.

Description

Technical Field

[0001] This invention relates to the field of current collector technology, and more particularly to a current collector, cover plate assembly, battery, and electrical equipment. Background Technology

[0002] Existing cylindrical lithium batteries typically have a full tab structure. Lithium batteries usually employ a method of connecting double-sided tabs, core tabs, and the outer casing (or cover plate) of the core. Specifically, the core tabs are first connected via a current collector structure, which is then welded to the outer casing (or cover plate) of the core.

[0003] In existing technologies, through-welding is typically used when welding the current collector structure to the electrode post.

[0004] However, when using through-welding, it is usually necessary to penetrate a relatively thick electrode post to connect with the current collector structure. This typically requires increasing laser energy during the welding process, resulting in a corresponding increase in heat. As the temperature rises, it can easily cause burns to the cell separator, or even penetration of the current collector structure. Summary of the Invention

[0005] The purpose of this invention is to provide a current collector, a cover plate assembly, a battery, and an electrical device, aiming to solve the problems of excessive energy during welding of the current collector to the terminal post, which can cause the current collector to be welded through or even burn the cell diaphragm, and insufficient energy, which can lead to poor contact and poor current carrying capacity of the cell due to poor welding of the current collector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a current collector, including a current collector body, the current collector body having a first connecting boss, the first connecting boss having a first liquid injection hole, the first connecting boss being housed in a second liquid injection hole of an electrode post, and the second liquid injection hole communicating with the first liquid injection hole.

[0008] The current collector provided in this application can use the position where the first connecting boss contacts the second injection hole as the welding position. In this case, a splicing welding method can be used instead of through welding, reducing the welding difficulty between the current collector and the terminal. Furthermore, using splicing welding to connect the current collector and the terminal eliminates the need to penetrate the terminal, thus avoiding the problems of high temperatures burning the cell separator and welding through the current collector.

[0009] In some embodiments, along the height direction of the first connecting boss, from the top end of the first connecting boss to the bottom end of the first connecting boss, the cross-sectional area of ​​the first connecting boss gradually decreases.

[0010] In some embodiments, the side of the first connecting boss is a tapered surface.

[0011] In some embodiments, the surface of the current collector body facing the pole is the first surface, and the angle between the tapered surface and the first surface is greater than or equal to 0° and less than or equal to 85°.

[0012] In some embodiments, the surface of the current collector body facing away from the terminal post is a second surface, and the second surface is provided with at least one rib for electrical connection with the battery cell.

[0013] In some embodiments, the rib includes a first rib portion and a second rib portion, both of which extend from the edge of the current collector body toward the center of the current collector body. The extension direction of the first rib portion intersects with the extension direction of the second rib portion, and the end of the first rib portion away from the edge of the current collector body is connected to the end of the second rib portion away from the edge of the current collector body.

[0014] In some embodiments, there are multiple ribs, which are spaced apart circumferentially along the body of the collector.

[0015] In some embodiments, a groove is provided on the first surface at a position opposite to the rib.

[0016] In some embodiments, the current collector body is provided with at least one drain hole, which penetrates the current collector body.

[0017] In some embodiments, the portion of the current collector body between the first rib and the second rib is a first current collector portion, located on the side of the first and second ribs opposite to the center of the current collector body. A drain hole includes a first drain hole, which is disposed in the first current collector portion.

[0018] In some embodiments, the ribs include a first rib, a second rib, a third rib, and a fourth rib, which are spaced apart circumferentially along the collector. The portion of the collector body between the first and second ribs constitutes a second collector portion, located on the side of the first and second ribs facing the center of the collector body. The portion of the collector body between the second and third ribs constitutes a third collector portion, located on the side of the second and third ribs facing the center of the collector body. The portion of the collector body between the third and fourth ribs constitutes a fourth collector portion, located on the side of the third and fourth ribs facing the center of the collector body. The portion of the collector body between the fourth and first ribs constitutes a fifth collector portion, located on the side of the fourth and first ribs facing the center of the collector body. The second, third, fourth, and fifth collector portions are interconnected. The vent hole includes at least one second vent hole, which is disposed in at least one of the second, third, fourth, and fifth flow collection sections.

[0019] In some embodiments, the first connecting boss is located between the second and fourth collector portions, and the first connecting boss is also located between the third and fifth collector portions.

[0020] In some embodiments, the edge of the manifold body is provided with a foolproof notch.

[0021] Secondly, the present invention also provides a cover plate assembly, including an electrode post and any of the aforementioned current collectors. The electrode post is provided with a second injection hole, a first connecting boss is accommodated within the second injection hole of the electrode post, and the second injection hole communicates with the first injection hole.

[0022] In some embodiments, an annular boss is provided at one end of the second injection hole facing the manifold body, and the annular boss is arranged circumferentially along the second injection hole. The first connecting boss is accommodated within the area surrounded by the annular boss.

[0023] In some embodiments, the cover plate assembly further includes a connecting block and a light cover plate. The connecting block has a first clearance hole, and the electrode post passes through the first clearance hole and is connected to the connecting block. The light cover plate has a second clearance hole, and the electrode post also passes through the second clearance hole. The light cover plate is located on the side of the connecting block near the current collector.

[0024] In some embodiments, the cover plate assembly further includes an insulating block and a spacer. The insulating block has a third clearance hole, and the electrode post passes through the third clearance hole. The insulating block is located between the connecting block and the optical cover plate. The spacer has a fourth clearance hole, and the electrode post passes through the fourth clearance hole. The spacer is located between the optical cover plate and the current collector.

[0025] In some embodiments, the cover plate assembly further includes a seal. The seal has a fifth clearance hole, and the pole post passes through the fifth clearance hole. The seal is disposed between the pole post and the cover plate.

[0026] In some embodiments, the cover plate assembly further includes an injection hole sealing pin, which passes through the first injection hole to block the first injection hole.

[0027] In some embodiments, the cover plate assembly further includes an injection hole sealing cap disposed inside the second injection hole and connected to the electrode post for sealing the second injection hole.

[0028] In some embodiments, the second injection hole includes a first segment and a second segment, wherein the diameter of the first segment is larger than the diameter of the second segment. A portion of the injection hole sealing cap is located within the first segment, and another portion of the injection hole sealing cap is located within the second segment. The injection hole sealing cap is connected to the first segment.

[0029] In some embodiments, along the height direction of the pole post, from the top end of the first hole segment to the bottom end of the first hole segment, the cross-sectional area of ​​the first hole segment gradually decreases.

[0030] In some embodiments, a first welding groove is provided on the side of the injection hole sealing cap away from the manifold, and the first welding groove is arranged around the perimeter of the injection hole sealing cap. A second welding groove is provided on the side of the connecting block away from the manifold, and the second welding groove is arranged around the perimeter of the first clearance hole. The first welding groove and the second welding groove are in communication.

[0031] In some embodiments, a limiting component is provided between the connecting block and the light cover plate, the limiting component being used to prevent the connecting block from rotating relative to the light cover plate.

[0032] In some embodiments, the limiting component includes a first limiting component disposed between the connecting block and the insulating block, the first limiting component being used to prevent the connecting block from rotating relative to the insulating block. The first limiting component includes a first limiting portion and a second limiting portion, the first limiting portion being disposed on the outer peripheral surface of the connecting block, the second limiting portion being disposed on the side of the insulating block near the connecting block, and the second limiting portion being disposed along the circumferential direction of the insulating block, the first limiting portion and the second limiting portion being connected.

[0033] In some embodiments, the limiting component further includes a second limiting component disposed between the insulating block and the light cover plate, the second limiting component being used to prevent the insulating block from rotating relative to the light cover plate. The second limiting component includes a third limiting portion and a fourth limiting portion, the third limiting portion being disposed on the side of the insulating block near the light cover plate, the third limiting portion being disposed on the side of the light cover plate near the insulating block, and the third limiting portion being connected to the fourth limiting portion.

[0034] In some embodiments, the insulating block is provided with a first venting groove on the side near the connecting block, the first venting groove has a gap with the connecting block, and the first venting groove communicates with the third clearance hole.

[0035] In some embodiments, a first reinforcing rib is provided on the side of the spacer near the collector, and the first reinforcing rib is arranged circumferentially along the spacer. When the collector body has a drain hole, the drain hole is located inside the first reinforcing rib.

[0036] Thirdly, the present invention also provides a battery comprising any of the aforementioned cover plate assembly, battery casing, and battery cell. The battery casing forms an open receiving cavity, and the cover plate assembly is used to seal the opening. The battery cell is disposed within the receiving cavity and is electrically connected to a current collector.

[0037] Fourthly, the present invention also provides an electrical device, including the above-mentioned battery and electrical components, wherein the battery and the electrical components are electrically connected. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 One of the schematic diagrams of a current collector provided in an embodiment of this application;

[0040] Figure 2 One of the schematic diagrams of an electrode post provided in this application embodiment;

[0041] Figure 3 One of the schematic diagrams of a cover plate assembly provided in an embodiment of this application;

[0042] Figure 4 One of the schematic diagrams of the first connecting boss provided in the embodiments of this application;

[0043] Figure 5 A second schematic diagram of the first connecting boss provided in an embodiment of this application;

[0044] Figure 6 A second schematic diagram of a current collector provided in an embodiment of this application;

[0045] Figure 7 A second schematic diagram of a cover plate assembly provided in an embodiment of this application;

[0046] Figure 8 A second schematic diagram of a pole post provided in an embodiment of this application;

[0047] Figure 9 A schematic diagram of a connection block provided in an embodiment of this application;

[0048] Figure 10 A schematic diagram of an insulating block provided in an embodiment of this application;

[0049] Figure 11 A schematic diagram of a light cover plate provided in an embodiment of this application;

[0050] Figure 12 A schematic diagram of a sealing element provided in an embodiment of this application;

[0051] Figure 13 This is a schematic diagram of a spacer provided in an embodiment of this application.

[0052] Figure label:

[0053] 1-Current collector; 10-Current collector body; 101-First surface; 102-Second surface; 11-First connecting boss; 110-First injection hole; 12-Rib; 121-First rib portion; 122-Second rib portion; 1210-First rib; 1220-Second rib; 1230-Third rib; 1240-Fourth rib; 1201-First collecting section; 1202-Second collecting section; 1203-Third collecting section; 1204-Fourth collecting section; 1205-Fifth collecting section; 13-Groove; 130-Drain hole; 1301-First drain hole; 1302-Second drain hole; 1100-Conical surface; 1000-Foolproof notch ; 2-Pole post; 20-Second injection hole; 2001-First hole section; 2002-Second hole section; 3-Connecting block; 30-First clearance hole; 4-Smooth cover plate; 40-Second clearance hole; 5-Insulating block; 50-Third clearance hole; 6-Spacer ring; 60-Fourth clearance hole; 61-First reinforcing rib; 62-Second reinforcing rib; 7-Seal; 8-Injection hole sealing nail; 500-First vent groove; 600-Second vent groove; 9-Injection hole sealing cover; 90-First welding groove; 300-Second welding groove; 91-First limiting component; 911-First limiting part; 912-Second limiting part; 92-Second limiting component; 921-Third limiting part; 922-Fourth limiting part. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-described orientation can be flexibly set in practical applications, provided that the relative positional relationship shown in the accompanying drawings is satisfied.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" 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 direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0059] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0060] This application provides an electrical device, including a battery and an electrical component, wherein the battery and the electrical component are electrically connected. The battery provides electrical energy to the electrical component to enable it to operate.

[0061] For example, electrical equipment can be terminal equipment such as vehicles, ships, and energy storage cabinets.

[0062] For example, when the electrical equipment is a vehicle, the battery can provide power to the vehicle's electric motor, enabling the motor to drive the vehicle.

[0063] Based on this, this application also provides a battery, which includes a cover assembly, a battery casing, and a battery cell. The battery casing forms an open receiving cavity, and the battery cell is disposed within the receiving cavity of the battery casing and electrically connected to a current collector. The cover assembly is disposed at the opening of the battery casing to seal the opening.

[0064] The current collector, which is electrically connected to the battery cell, is also connected to other components of the electrode and cover plate assembly to achieve the conductivity of the current collector. Typically, the current collector and electrode are connected by through-welding. Through-welding concentrates welding energy into a very small area to penetrate the upper material and melt the lower material, thus achieving a strong connection between two or more layers of material. Taking laser through-welding as an example, a high-power laser beam concentrates energy at the welding point, penetrates the electrode, and melts the current collector. The molten metal between the electrode and the current collector mixes together, and after cooling, a strong connection is achieved.

[0065] However, when connecting the current collector and the terminal block using the aforementioned through-welding method, the high-power laser beam generates extremely high heat during the welding process. If the energy is too high, it can easily burn through the current collector or even scald the cell diaphragm; if the energy is too low, it may result in a poor connection between the current collector and the terminal block, leading to poor current carrying capacity in the cell.

[0066] To address the aforementioned issue, namely the potential damage to the battery during the welding process between the current collector and the terminal block, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of a current collector provided in this application. The current collector 1 is applied to a battery. The current collector 1 includes a current collector body 10, the current collector body 10 is provided with a first connecting boss 11, and the first connecting boss 11 is provided with a first liquid injection hole 110.

[0067] like Figure 2 As shown, the terminal post 2 is provided with a second injection hole 20, which is connected to the first injection hole 110. In this way, during the battery electrolyte filling process, the electrolyte can be injected into the battery casing through the connected second injection hole 20 and first injection hole 110.

[0068] like Figure 3 As shown, the first connecting boss 11 is housed within the second injection hole 20 of the electrode post 2. This allows the contact point between the first connecting boss 11 and the second injection hole 20 to be used as the welding position. In this case, a splicing welding method can be used instead of through welding, reducing the welding difficulty between the current collector 1 and the electrode post 2. Furthermore, using splicing welding to connect the current collector 1 and the electrode post 2 eliminates the need to penetrate the electrode post 2, thus avoiding the problems of high temperatures burning the cell separator and soldering through the current collector 1. It also avoids the problem of poor contact and poor current carrying capacity of the cell due to insufficient energy causing a weak solder joint between the current collector 1 and the electrode post 2.

[0069] Furthermore, it should be noted that the first connecting boss 11, housed within the second injection hole 20 of the electrode post 2, can increase the cross-sectional area, thereby improving conductivity. For example... Figure 3As shown, the first connecting boss 11 is housed in the second injection hole 20 of the pole post 2. In addition to contact in the horizontal direction, the collector 1 and the pole post 2 also contact in the vertical direction, that is, the side wall of the first connecting boss 11 and the side wall of the second injection hole 20 are also in contact.

[0070] This increases the contact area between the current collector 1 and the terminal 2, thereby increasing the current flow area from the current collector 1 to the terminal 2 and improving conductivity.

[0071] In some embodiments of this application, along the height direction of the first connecting boss 11, from the top end of the first connecting boss 11 to the bottom end of the first connecting boss 11, the cross-sectional area of ​​the first connecting boss 11 gradually decreases. It should be noted that the top end of the first connecting boss 11 refers to the end of the first connecting boss 11 away from the current collector body 10, and the bottom end of the first connecting boss 11 refers to the end of the first connecting boss 11 connected to the current collector body 10.

[0072] In this way, when the first connecting boss 11 is housed in the second injection hole 20 of the pole post 2, the relatively large diameter tip and the side wall of the second injection hole 20 are interference-fitted, providing appropriate interference and elasticity between the first connecting boss 11 and the inner wall of the second injection hole 20. On the one hand, this ensures a tight fit between the first connecting boss 11 and the inner wall of the second injection hole 20, thereby ensuring good welding between the current collector body 10 and the pole post 2. On the other hand, the interference fit between the first connecting boss 11 and the inner wall of the second injection hole 20 ensures that the position between the first connecting boss 11 and the pole post 2 does not easily change during the welding process, ensuring a high welding yield.

[0073] In some embodiments of this application, such as Figure 4 As shown, the side of the first connecting boss 11 is a tapered surface 1100.

[0074] In this way, when the side surface of the first connecting boss 11 is a tapered surface 1100, and the first connecting boss 11 contacts the inner wall of the second injection hole 20 with a flat surface, an interference fit can be ensured between the first connecting boss 11 and the inner wall surface of the second injection hole 20, thereby achieving a tighter fit. Figure 5 This further ensures good welding between the current collector body 10 and the pole post 2.

[0075] In some embodiments of this application, such as Figure 4 As shown, the surface of the current collector body 10 facing the pole post 2 is the first surface 101. Based on this, the aforementioned conical surface 1100 and the first surface 101 have an angle, which is greater than or equal to 0° and less than or equal to 85°.

[0076] For example, the included angle between the conical surface 1100 and the first surface 101 can be 85°, 80°, 75°, etc.

[0077] This ensures a tighter fit between the first connecting boss 11 and the inner wall of the second injection hole 20, further guaranteeing good welding between the manifold body 10 and the pole post 2.

[0078] In some embodiments of this application, such as Figure 6 As shown, the surface of the current collector body 10 facing away from the terminal post 2 is the second surface 102. The second surface 102 is provided with at least one rib 12, which is used for electrical connection with the battery cell.

[0079] As can be seen from the above, at least one rib 12 is provided on the second surface 102 of the current collector body 10. On the one hand, the rib 12 can strengthen the structural strength of the current collector body 10, so that the current collector body 10 is not easily deformed during the assembly process.

[0080] On the other hand, by providing a rib 12 on the second surface 102 of the current collector body 10 for electrical connection with the battery cell, the current collector 1 can achieve better contact and connection with the battery cell.

[0081] Typically, the current collector body 10 is connected to the tabs of the battery cell, and the following explanation is based on a full-tab structure. When the battery cell has a full-tab structure, since the full-tab structure is a planar structure, the ribs 12 provided on the second surface 102 of the current collector body 10 can make better contact with the planar full-tab battery cell.

[0082] Because the surface area of ​​the plane formed by the rib 12 facing the tab structure is significantly smaller than the surface area of ​​the current collector body 10, and the area of ​​the rib 12 facing the tab is smaller, the rib 12 can apply greater pressure to the plane formed by the tab when it is in contact with the tab. This is beneficial for forming a tighter connection. A tighter connection can ensure a good welding effect of the tab during the welding process and avoid false welds or incomplete welds.

[0083] like Figure 6 As shown, in some embodiments of this application, the aforementioned rib 12 includes a first rib portion 121 and a second rib portion 122. Both the first rib portion 121 and the second rib portion 122 extend from the edge of the current collector body 10 towards the center of the current collector body 10, and the extending direction of the first rib portion 121 intersects the extending direction of the second rib portion 122. Furthermore, the end of the first rib portion 121 away from the edge of the current collector body 10 is connected to the end of the second rib portion 122 away from the edge of the current collector body 10.

[0084] Both the first rib 121 and the second rib 122 extend from the edge of the current collector body 10 toward the center of the current collector body 10, and the first rib 121 and the second rib 122 can be evenly distributed on the second surface 102 of the current collector body 10. Furthermore, the tabs connected to the current collector 1 via the first rib 121 and the second rib 122 can be more evenly electrically connected to the current collector.

[0085] Furthermore, it should be noted that the end of the first rib 121 away from the edge of the current collector body 10 is connected to the end of the second rib 122 away from the edge of the current collector body 10. For example, in some embodiments, the first rib 121 and the second rib 122 can form an "L"-shaped structure. On the one hand, by intersecting the first rib 121 and the second rib 122 to make the rib 12 "L"-shaped, the structural strength of the current collector body 10 can be further enhanced. On the other hand, intersecting the first rib 121 and the second rib 122, so that the first rib 121 and the second rib 122 extend from the edge of the current collector body 10 towards the center of the current collector body 10 from two different directions, also facilitates a more uniform connection between the current collector body 10 and the electrode through the rib 12, resulting in better conductivity.

[0086] like Figure 6 As shown, in some embodiments of this application, the number of protruding ribs 12 can be multiple, and the multiple protruding ribs 12 are arranged at circumferential intervals along the current collector body 10.

[0087] For example, there can be four ribs 12, which are spaced apart circumferentially along the current collector body 10. The four ribs 12 can be spaced equally or unequally. When the four ribs 12 are spaced equally, the current collector body 10 has better conductivity. When the four ribs 12 are spaced unequally, the structural strength of specific parts of the current collector body 10 can be further enhanced.

[0088] like Figure 1 As shown, in some embodiments of this application, a groove 13 is provided on the first surface 101 of the current collector body 10, at a position opposite to the rib 12.

[0089] The groove 13 described above can play a guiding role when welding the electrode lug and the rib 12, thereby improving the welding accuracy.

[0090] like Figure 1 As shown, in some embodiments of this application, the current collector body 10 is provided with at least one drain hole 130, which penetrates the current collector body 10.

[0091] In this way, during the electrolyte injection process, as the electrolyte is injected into the battery casing through the connected first injection hole 110 and second injection hole 20, the electrolyte gradually fills the gaps in the battery casing under the action of gravity, displacing the gas originally present in the gaps upwards. In this case, the drain hole 130 provided on the current collector body 10 can play a role in balancing the gas pressure inside and outside the battery casing, making the electrolyte injection process smoother.

[0092] like Figure 6 As shown, the portion of the current collector body 10 between the first rib portion 121 and the second rib portion 122 is the first current collector portion 1201, which is located on the side of the first rib portion 121 and the second rib portion 122 that is away from the center of the current collector body 10.

[0093] like Figure 6 As shown, the drain hole 130 includes a first drain hole 1301, which is disposed in the first collection section 1201.

[0094] Setting the first drain hole 1301 in the first collection section 1201 can ensure good contact between the rib 12 and the electrode ear.

[0095] like Figure 6 As shown, in some embodiments of this application, the rib 12 may include a first rib 1210, a second rib 1220, a third rib 1230, and a fourth rib 1240. The first rib 1210, the second rib 1220, the third rib 1230, and the fourth rib 1240 are arranged at circumferential intervals along the current collector body 10.

[0096] In this case, the portion of the current collector body 10 between the first rib 1210 and the second rib 1220 is the second current collector portion 1202, which is located on the side of the first rib 1210 and the second rib 1220 facing the center of the current collector body 10.

[0097] The portion of the current collector body 10 between the second rib 1220 and the third rib 1230 is the third current collector portion 1203, which is located on the side of the second rib 1220 and the third rib 1230 facing the center of the current collector body 10.

[0098] The portion of the current collector body 10 between the third rib 1230 and the fourth rib 1240 is the fourth current collector portion 1204, which is located on the side of the third rib 1230 and the fourth rib 1240 facing the center of the current collector body 10.

[0099] The portion of the current collector body 10 between the fourth rib 1240 and the first rib 1210 is the fifth current collector portion 1205, which is located on the side of the fourth rib 1240 and the first rib 1210 facing the center of the current collector body 10.

[0100] Based on this, the second collector section 1202, the third collector section 1203, the fourth collector section 1204 and the fifth collector section 1205 are connected together.

[0101] The drain hole 130 includes at least one second drain hole 1302, which is disposed in at least one of the second collection section 1202, the third collection section 1203, the fourth collection section 1204, and the fifth collection section 1205.

[0102] At least one second drain hole 1302 is provided in at least one of the above-mentioned second current collection section 1202, third current collection section 1203, fourth current collection section 1204 and fifth current collection section 120. In this way, during the battery electrolyte injection process, the gas in the battery casing can be discharged through the second drain hole 1302, thereby ensuring the gas pressure balance inside and outside the battery casing, so that the electrolyte can be injected into the battery casing more smoothly and improve the electrolyte injection efficiency.

[0103] Based on this, the first vent hole 1301 is located on the side of the rib 12 facing away from the center of the current collector body 10, and the second vent hole 1302 is located on the side of the rib 12 facing the center of the current collector body 10. That is, the rib 12 has vent holes 130 in the radial direction of the current collector body 10. This can better maintain the gas pressure balance, and during the liquid injection process, it can better maintain the gas pressure balance of various parts inside the battery casing, thereby improving the liquid injection efficiency.

[0104] like Figure 1 As shown, in some embodiments of this application, the first connecting boss 11 is located between the second current collecting portion 1202 and the fourth current collecting portion 1204, and the first connecting boss 11 is also located between the third current collecting portion 1203 and the fifth current collecting portion 1205. That is, the first connecting boss 11 is disposed at the center of the area formed by the connection of the second current collecting portion 1202, the third current collecting portion 1203, the fourth current collecting portion 1204 and the fifth current collecting portion 1205, which is also the center position of the current collecting body 10.

[0105] like Figure 1 As shown, in some embodiments of this application, the edge of the manifold body 10 is provided with a foolproof notch 1000. This foolproof notch 1000 makes the manifold body 10 an asymmetrical structure, which can play a foolproof role during the assembly and packaging of the manifold tray 1.

[0106] like Figure 7As shown, this application also provides a cover plate assembly 200, which includes an electrode post 2 and any of the above-mentioned flow collectors 1. The electrode post 2 is provided with a second injection hole 20.

[0107] Based on this, the first connecting boss 11 provided on the collector body 10 is housed in the second injection hole 20 of the pole post 2, and the second injection hole 20 is connected to the first injection hole 110 opened on the first connecting boss 11.

[0108] like Figure 8 As shown, an annular boss 201 is provided at one end of the second injection hole 20 facing the manifold body 10, and the annular boss 201 is arranged circumferentially along the second injection hole 20. The first connecting boss 11 is accommodated in the area surrounded by the annular boss 201.

[0109] In this way, the first connecting boss 11 is housed within the annular boss 201, and the first connecting boss 11 contacts the inner wall of the annular boss 201. By setting the annular boss 201 in the second injection hole 20 to contact the first connecting boss 11, the annular boss 201 and the first connecting boss 11 can be welded together during the welding process, thereby realizing the connection between the current collector body 10 and the pole post 2. It can be understood that by setting the annular boss 201 to weld with the first connecting boss 11, the contact area between the current collector body 10 and the pole post 2 can be increased, making the welding between the two more reliable.

[0110] In addition, such as Figure 8 As shown, the annular boss 201 has a chamfer at one end near the current collector body 10, which facilitates the first connecting boss 11 to extend into the annular boss 201.

[0111] like Figure 7 As shown, the cover plate assembly 200 provided in this embodiment further includes a connecting block 3, which has a first clearance hole 30. The pole post 2 passes through the first clearance hole 30 and is connected to the connecting block 3. In addition, the cover plate assembly 200 also includes a light cover plate 4, which has a second clearance hole 40. The pole post 2 also passes through the second clearance hole 40, and the light cover plate 4 is located on the side of the connecting block 3 near the current collector 1.

[0112] The aforementioned cover plate 4 is connected to the battery casing and is used to seal the opening of the battery casing. This seals the current collector 1, terminal post 2, battery cell, and electrolyte within the battery casing. The connecting block 3 and terminal post 2 can be connected by welding. The cover plate 4, located between the connecting block 3 and terminal post 2, can be clamped between the connecting block 3 and the cover plate 4, further securing the cover plate 4 to ensure a good seal around the opening of the battery casing.

[0113] In some embodiments, the light cover plate 4 can be made of metal. When the light cover plate 4 is made of metal, the electrode post 2 passing through the second clearance hole 40 is spaced apart from the light cover plate 4, thereby preventing the electrode post 2 from contacting the light cover plate 4 and ensuring that the light cover plate 4 will not be electrically connected to the electrode post 2. This ensures that there is no electrical connection between the battery casing and the electrode post 2, and ensures that the battery casing is not charged.

[0114] In some embodiments, the aforementioned cover plate 4 may also be made of a non-metallic material. In this case, the pole post 2 passing through the second clearance hole 40 may be spaced apart from or in contact with the cover plate 4.

[0115] like Figure 7 As shown, in some embodiments of this application, the cover plate assembly 200 further includes an insulating block 5. The insulating block 5 is provided with a third clearance hole 50, and the pole post 2 is also disposed in the third clearance hole 50. The insulating block 5 is disposed between the connecting block 3 and the light cover plate 4.

[0116] The insulating block 5 is used to isolate the connecting block 3 from the light cover plate 4, so as to avoid electrical connection between the connecting block 3 connected to the pole post 2 and the light cover plate 4, thereby preventing the battery casing from becoming charged through the light cover plate 4.

[0117] See also Figure 7 To further insulate the light cover plate 4, the cover plate assembly 200 also includes a spacer ring 6. The spacer ring 6 has a fourth clearance hole 60, and the electrode post 2 passes through the fourth clearance hole 60. The spacer ring 6 is located between the light cover plate 4 and the current collector 1. The spacer ring 6 is used to isolate the light cover plate 4 from the current collector 1, preventing electrical connection between the light cover plate 4 and the current collector 1, thereby ensuring that the battery casing connected to the light cover plate 4 does not become energized.

[0118] As described above, the cover plate assembly 200 includes a current collector 1, a pole post 2, a connecting block 3, a light cover plate 4, an insulating block 5, and a spacer ring 6. The pole post 2 passes through clearance holes in the connecting block 3, the light cover plate 4, the insulating block 5, and the spacer ring 6. The light cover plate 4, the insulating block 5, and the spacer ring 6 are clamped between the connecting block 3 and the pole post 2 by welding between them.

[0119] Gaps may exist between the aforementioned components. For example, there may be a gap between the insulating block 5 and the terminal post 2, a gap between the insulating block 5 and the light cover plate 4, and a gap between the light cover plate 4 and the spacer ring 6. This could cause the electrolyte in the battery casing to flow out through the drain hole 130 on the current collector body 10, and then leak through the aforementioned gaps.

[0120] In this case, such as Figure 7 and Figure 12As shown, the cover assembly 200 provided in this application also includes a sealing element 7. The sealing element 7 has a fifth clearance hole 70, and the electrode post 2 is also inserted into the fifth clearance hole 70. The sealing element 7 is disposed between the electrode post 2 and the light cover plate 4. The sealing element 7 disposed between the electrode post 2 and the light cover plate 4 is deformed by compression, thereby sealing the gaps that may exist. This prevents the electrolyte in the battery casing from flowing out of the drain hole 130 opened on the current collector body 10 and leaking through the gaps.

[0121] like Figure 7 As shown, in some embodiments of this application, the cover assembly 200 provided in this application further includes an injection hole sealing pin 8. The injection hole sealing pin 8 passes through the first injection hole 110 and is used to seal the first injection hole 110. In this way, after the battery is filled with electrolyte, the injection hole sealing pin 8 can be inserted into the first injection hole 110 to seal the first injection hole 110 and prevent electrolyte from flowing out of the first injection hole 110.

[0122] Based on this, to further ensure that the electrolyte does not flow out after the injection is completed, such as Figure 7 As shown, the cover assembly provided in this application also includes an injection port sealing cap 9. The injection port sealing cap 9 is disposed within the second injection port 20 and is connected to the electrode post 2. The injection port sealing cap 9 is used to seal the second injection port 20, thereby ensuring that electrolyte does not flow out from the second injection port 20.

[0123] like Figure 8 As shown, in some embodiments of this application, the second injection hole 20 includes a first hole segment 2001 and a second hole segment 2002, wherein the diameter of the first hole segment 2001 is larger than the diameter of the second hole segment 2002. A portion of the injection hole sealing cap 9 is located within the first hole segment 2001, and another portion of the injection hole sealing cap 9 is located within the second hole segment 2002. The injection hole sealing cap 9 is connected to the first hole segment 2001 (see...). Figure 3 ).

[0124] In this way, a stepped surface 2000 is formed on the inner side of the second injection hole 20 composed of the first hole segment 2001 and the second hole segment 2002 with different diameters. The stepped surface 2000 can provide support for the injection hole sealing cover 9, so that the injection hole sealing cover 9 can be stably placed in the second injection hole 20, which is beneficial to the welding process of the injection hole sealing cover 9 and the pole post 2.

[0125] like Figure 3 As shown, in some embodiments of this application, along the height direction of the pole post 2, from the top end to the bottom end of the first hole segment 2001, the cross-sectional area of ​​the first hole segment 2001 gradually decreases. In this case, the inner wall surface of the first hole segment 2001 is a conical surface.

[0126] In this way, after the battery is filled with electrolyte, when using a laser to clean the electrolyte remaining on the second filling hole 20, the conical inner wall of the first hole section 2001 facilitates contact with the laser, thereby enabling better cleaning of the electrolyte remaining on the first hole section 2001. This ensures that no residual electrolyte will affect the welding between the filling hole sealing cap 9 and the electrode post 2 during the welding process, ensuring a reliable and secure weld between the sealing cap 9 and the electrode post 2.

[0127] As described above, the liquid injection hole sealing cap 9 used to seal the second liquid injection hole 20 and the connecting block 3 used for fixing are both fixed to the terminal post 2 by welding. During welding, weld veins may be left, and these weld veins have a certain height. Therefore, when welding is completed between the terminal post 2 and the connecting block 3 and the liquid injection hole sealing cap 9, the weld veins generated during the welding process will affect the flatness of the surface formed by the terminal post 2, the connecting block 3, and the liquid injection hole sealing cap 9, thus affecting the subsequent assembly of the battery pack or battery assembly.

[0128] To solve the above problems, such as Figure 3 As shown, in some embodiments of this application, the injection hole sealing cap 9 is provided with a first welding groove 90 on the side away from the manifold 1, and the first welding groove 90 is arranged around the injection hole sealing cap 9.

[0129] Based on this, a second welding groove 300 is provided on the side of the connecting block 3 away from the current collector 1, and the second welding groove 300 is arranged around the first clearance hole 30. The first welding groove 90 is connected to the second welding groove 300.

[0130] In this way, when welding the pole post 2, the connecting block 3 and the liquid injection hole sealing cap 9, the welding can be carried out in the connected first welding groove 90 and the second welding groove 300, so that the weld vein generated during welding can remain in the first welding groove 90 and the second welding groove 300. The height of the weld vein is offset by the groove depth of the first welding groove 90 and the second welding groove 300, thereby ensuring that the plane formed by the pole post 2, the connecting block 3 and the liquid injection hole sealing cap 9 is flat.

[0131] As described above, the connecting block 3 is connected to the terminal 2, and the terminal 2 is connected to the current collector body 10. A tab is welded to the side of the current collector body 10 away from the terminal 2. In this situation, if the connecting block 3 rotates, it will cause the terminal 2 connected to it to rotate, which in turn will cause the current collector body 10 to rotate. This will damage the weld between the current collector body 10 and the tab, resulting in battery damage.

[0132] Based on this, the cover plate assembly 200 provided in this application also includes a limiting component, which is disposed between the connecting block 3 and the light cover plate 4, and the limiting component is used to prevent the connecting block 3 from rotating relative to the light cover plate 4.

[0133] In this way, by preventing the connecting block 3 from rotating, the connection between the current collector body 10 and the electrode tab is kept stable and not damaged.

[0134] like Figure 7 As shown, in some embodiments of this application, the aforementioned limiting component includes a first limiting component 91, which is disposed between the connecting block 3 and the insulating block 5. The first limiting component 91 is used to prevent the connecting block 3 from rotating relative to the insulating block 5.

[0135] The first limiting component 91 includes a first limiting part 911 and a second limiting part 912. The first limiting part 911 is disposed on the outer peripheral surface of the connecting block 3, and the second limiting part 912 is disposed on the side of the insulating block 5 near the connecting block 3. The second limiting part 912 is disposed along the circumferential direction of the insulating block 5, and the first limiting part 911 and the second limiting part 912 are connected.

[0136] In some embodiments, such as Figure 9 As shown, the first limiting part 911 can be a protrusion provided on the outer peripheral surface of the connecting block 3, such as... Figure 10 As shown, the second limiting part 912 can be a groove formed inside the insulating block 5.

[0137] Thus, the first limiting part 911 of the protrusion (see Figure 9 The protrusion can be inserted into the second limiting part 912, which is a groove, so that the protrusion engages with the groove, thereby preventing the connecting block 3 ( Figure 7 ) and insulating block 5 ( Figure 7 They rotate relative to each other.

[0138] In this way, it can be ensured that there is no relative rotation between the connecting block 3 and the insulating block 5, thereby ensuring that the connecting block 3 will not rotate, and in turn ensuring that the pole 2 connected to the connecting block 3 will not rotate, thereby ensuring that the pole 2 will not drive the current collector body 10 connected to it to rotate, and ensuring that the connection between the current collector body 10 and the electrode tab will not be damaged.

[0139] Based on this, such as Figure 7 As shown, the limiting component also includes a second limiting component 92, which is disposed between the insulating block 5 and the light cover plate 4. The second limiting component 92 is used to prevent the insulating block 5 from rotating relative to the light cover plate 4.

[0140] like Figure 3 and Figure 7 As shown, the second limiting component 92 includes a third limiting part 921 and a fourth limiting part 922. The third limiting part 921 is located on the side of the insulating block 5 near the light cover plate 4, and the third limiting part 921 is located on the side of the light cover plate 4 near the insulating block 5. The third limiting part 921 is connected to the fourth limiting part 922.

[0141] In some embodiments, such as Figure 10 As shown, the aforementioned third limiting part 921 can be a protrusion protruding towards the light cover plate 4, such as... Figure 11 As shown, the fourth limiting portion 922 can be a groove. In this way, the third limiting portion 921, which is a protrusion, can extend into the fourth limiting portion 922, which is a groove.

[0142] In this way, the third limiting part 921 and the fourth limiting part 922 engage, thereby ensuring that the insulating block 5 and the light cover plate 4 will not rotate. This ensures that the connecting block 3 connected to the insulating block 5 will not rotate with the insulating block 5, further ensuring that the connection between the current collector body 10 and the electrode tab will not be damaged.

[0143] It should be noted that after the cover assembly 200 and the battery housing are assembled, a sealing performance test is usually required to ensure good sealing performance between the cover assembly 200 and the battery housing. Typically, an inert gas is used to fill the inside of the battery housing, and the test is performed to check for leaks between the battery housing and the cover assembly 200.

[0144] For example, if there is a gap between the cover plate 4 and the insulating block 5, there is a risk of leakage, so the aforementioned sealing element 7 is required. However, during the testing process, there may be a situation where the contact surface between the cover plate 4 and the insulating block 5 is in good contact, and even if the sealing element 7 is omitted, there may be a situation where the risk of leakage is not detected. However, the sealing effect achieved solely by good contact between components is unreliable.

[0145] Therefore, to avoid the situation where seal 7 is omitted, such as Figure 10 As shown, the insulating block 5 is provided with a first exhaust groove 500 on the side near the connecting block 3. There is a gap between the first exhaust groove 500 and the connecting block 3, and the first exhaust groove 500 is connected to the third clearance hole.

[0146] In this way, during a sealing test, if the seal 7 is not installed, gas can leak to the outside through the first vent groove 500 between the connecting block 3 and the insulating block 5, thereby detecting the risk of leakage and allowing for an investigation into whether the seal 7 is missing. If the seal 7 is missing, it can be added to ensure reliable sealing performance.

[0147] like Figure 13 As shown, in some embodiments of this application, a first reinforcing rib 61 is provided on the side of the spacer ring 6 near the current collector 1, and the first reinforcing rib 61 is arranged along the circumference of the spacer ring 6.

[0148] The aforementioned first reinforcing rib 61 improves the structural strength of the spacer ring 6 and allows the spacer ring 6 to contact the current collector body 10. During battery charging and discharging, the battery cell may expand, and the current collector body 10 may move upwards. Therefore, the first reinforcing rib 61 on the spacer ring 6 can press against the current collector body 10 when it moves upwards, preventing the current collector body 10 from moving and thus ensuring battery stability.

[0149] Based on this, a second reinforcing rib 62 can be provided on the spacer ring 6 to further enhance the structural strength of the spacer ring 6 and to resist the pressure of the current collector body 10. Accordingly, a second venting groove 600 can also be provided on the second reinforcing rib 62 to further ensure the accuracy of the sealing test.

[0150] Furthermore, it should be noted that when the current collector body 10 is provided with a drain hole 130, the drain hole 130 is located inside the first reinforcing rib 61. This ensures that no leakage occurs when the electrolyte flows out of the drain hole 130. The electrolyte, after flowing out of the drain hole 130, remains within the space enclosed by the first reinforcing rib 61 and the current collector body 10, and does not leak to the outside.

[0151] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0152] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A current collector (1), applied to a battery, characterized in that, include: The collector body (10) is provided with a first connecting boss (11), the first connecting boss (11) is provided with a first injection hole (110), the first connecting boss (11) is housed in the second injection hole (20) of the pole post (2), and the second injection hole (20) is connected to the first injection hole (110); An annular boss (201) is provided at one end of the second injection hole (20) facing the main body (10) of the manifold, and the annular boss (201) is arranged circumferentially along the second injection hole (20); the first connecting boss (11) is housed in the area surrounded by the annular boss (201). Along the height direction of the first connecting boss (11), from the top end of the first connecting boss (11) to the bottom end of the first connecting boss (11), the cross-sectional area of ​​the first connecting boss (11) gradually decreases, and the top end of the first connecting boss (11) is interference-fitted with the side wall of the annular boss (201). The surface of the current collector body (10) facing away from the terminal post (2) is a second surface (102), and the second surface (102) is provided with at least one rib (12), which is used to electrically connect with the battery cell; The rib (12) includes a first rib portion (121) and a second rib portion (122). Both the first rib portion (121) and the second rib portion (122) extend from the edge of the current collector body (10) toward the center of the current collector body (10). The extension direction of the first rib portion (121) intersects the extension direction of the second rib portion (122). The end of the first rib portion (121) away from the edge of the current collector body (10) is connected to the end of the second rib portion (122) away from the edge of the current collector body (10).

2. The current collector (1) according to claim 1, characterized in that, The side of the first connecting boss (11) is a tapered surface (1100).

3. The current collector (1) according to claim 2, characterized in that, The surface of the current collector body (10) facing the pole post (2) is the first surface (101), and the angle between the conical surface (1100) and the first surface (101) is greater than or equal to 0° and less than or equal to 85°.

4. The current collector (1) according to claim 3, characterized in that, The number of the protruding ribs (12) is multiple, and the multiple protruding ribs (12) are arranged at intervals along the circumference of the collector body (10).

5. The current collector (1) according to claim 4, characterized in that, A groove (13) is provided on the first surface (101) at a position opposite to the rib (12).

6. The current collector (1) according to claim 4 or 5, characterized in that, The main body (10) of the current collector is provided with at least one drain hole (130), which penetrates the main body (10).

7. The current collector (1) according to claim 6, characterized in that, The portion of the current collector body (10) between the first rib (121) and the second rib (122) is the first current collector portion (1201), which is located on the side of the first rib (121) and the second rib (122) that is away from the center of the current collector body (10). The drain hole (130) includes a first drain hole (1301), which is located in the first collection section (1201).

8. The current collector (1) according to claim 7, characterized in that, The rib (12) includes a first rib (1210), a second rib (1220), a third rib (1230) and a fourth rib (1240), the first rib (1210), the second rib (1220), the third rib (1230) and the fourth rib (1240) are arranged circumferentially along the main body (10) of the collector; The portion of the current collector body (10) between the first rib (1210) and the second rib (1220) is the second current collector portion (1202), which is located on the side of the first rib portion (121) and the second rib portion (122) facing the center of the current collector body (10); The portion of the current collector body (10) between the second rib (1220) and the third rib (1230) is the third current collector portion (1203), which is located on the side of the second rib (1220) and the third rib (1230) facing the center of the current collector body (10); The portion of the current collector body (10) between the third rib (1230) and the fourth rib (1240) is the fourth current collector portion (1204), which is located on the side of the third rib (1230) and the fourth rib (1240) facing the center of the current collector body (10). The portion of the current collector body (10) between the fourth rib (1240) and the first rib (1210) is the fifth current collector portion (1205), which is located on the side of the fourth rib (1240) and the first rib (1210) facing the center of the current collector body (10). The second collector section (1202), the third collector section (1203), the fourth collector section (1204), and the fifth collector section (1205) are connected together; The drain hole (130) includes at least one second drain hole (1302), which is disposed in at least one of the second flow collection section (1202), the third flow collection section (1203), the fourth flow collection section (1204), and the fifth flow collection section (1205).

9. The current collector (1) according to claim 8, characterized in that, The first connecting boss (11) is located between the second collector section (1202) and the fourth collector section (1204), and the first connecting boss (11) is also located between the third collector section (1203) and the fifth collector section (1205).

10. The current collector (1) according to claim 1, characterized in that, The edge of the current collector body (10) is provided with a foolproof notch (1000).

11. A cover plate assembly (200), characterized in that, Includes pole (2) and current collector (1) as described in any one of claims 1-10; The electrode (2) is provided with the second injection hole (20); The first connecting boss (11) is housed in the second injection hole (20) of the pole post (2), and the second injection hole (20) is connected to the first injection hole (110).

12. The cover plate assembly (200) according to claim 11, characterized in that, The cover plate assembly (200) also includes: A connecting block (3) is provided with a first clearance hole (30), and the pole post (2) is inserted into the first clearance hole (30). The pole post (2) is connected to the connecting block (3). The light cover plate (4) is provided with a second clearance hole (40), and the pole post (2) is also inserted into the second clearance hole (40). The light cover plate (4) is located on the side of the connecting block (3) near the current collector (1).

13. The cover plate assembly (200) according to claim 12, characterized in that, The cover plate assembly (200) also includes: An insulating block (5) is provided with a third clearance hole (50), and the pole post (2) is also inserted into the third clearance hole (50). The insulating block (5) is located between the connecting block (3) and the light cover plate (4). The spacer (6) is provided with a fourth clearance hole (60), and the pole post (2) is also inserted into the fourth clearance hole (60). The spacer (6) is located between the light cover plate (4) and the current collector (1).

14. The cover plate assembly (200) according to claim 13, characterized in that, The cover plate assembly (200) also includes: The sealing element (7) is provided with a fifth clearance hole (70), and the pole post (2) is also inserted into the fifth clearance hole (70). The sealing element (7) is located between the pole post (2) and the light cover plate (4).

15. The cover plate assembly (200) according to claim 11, characterized in that, The cover plate assembly (200) also includes: The injection hole sealing nail (8) is inserted into the first injection hole (110) to seal the first injection hole (110).

16. The cover plate assembly (200) according to claim 11, characterized in that, The cover plate assembly (200) also includes: The injection hole sealing cap (9) is located inside the second injection hole (20), and the injection hole sealing cap (9) is connected to the pole (2) to seal the second injection hole (20).

17. The cover plate assembly (200) according to claim 16, characterized in that, The second injection hole (20) includes a first hole segment (2001) and a second hole segment (2002), wherein the diameter of the first hole segment (2001) is larger than the diameter of the second hole segment (2002); A portion of the injection hole sealing cap (9) is located within the first hole section (2001), and another portion of the injection hole sealing cap (9) is located within the second hole section (2002); The injection hole sealing cap (9) is connected to the first hole section (2001).

18. The cover plate assembly (200) according to claim 17, characterized in that, Along the height direction of the pole post (2), from the top end of the first hole segment (2001) to the bottom end of the first hole segment (2001), the cross-sectional area of ​​the first hole segment (2001) gradually decreases.

19. The cover plate assembly (200) according to claim 16, characterized in that, The injection hole sealing cap (9) is provided with a first welding groove (90) on the side away from the flow collector (1), and the first welding groove (90) is arranged around the injection hole sealing cap (9). The cover plate assembly (200) also includes: A connecting block (3) is provided with a first clearance hole (30), and the pole post (2) is inserted into the first clearance hole (30). The pole post (2) is connected to the connecting block (3). The connecting block (3) is provided with a second welding groove (300) on the side away from the current collector (1), and the second welding groove (300) is arranged around the first clearance hole (30); The first welding groove (90) is connected to the second welding groove (300).

20. The cover plate assembly (200) according to claim 13, characterized in that, A limiting component is provided between the connecting block (3) and the light cover plate (4), and the limiting component is used to prevent the connecting block (3) from rotating relative to the light cover plate (4).

21. The cover plate assembly (200) according to claim 20, characterized in that, The limiting component includes a first limiting component (91), which is disposed between the connecting block (3) and the insulating block (5). The first limiting component (91) is used to prevent the connecting block (3) from rotating relative to the insulating block (5). The first limiting component (91) includes a first limiting part (911) and a second limiting part (912). The first limiting part (911) is disposed on the outer peripheral surface of the connecting block (3), and the second limiting part (912) is disposed on the side of the insulating block (5) near the connecting block (3). The second limiting part (912) is disposed along the circumferential direction of the insulating block (5). The first limiting part (911) and the second limiting part (912) are connected.

22. The cover plate assembly (200) according to claim 21, characterized in that, The limiting component further includes a second limiting component (92), which is disposed between the insulating block (5) and the light cover plate (4). The second limiting component (92) is used to prevent the insulating block (5) from rotating relative to the light cover plate (4). The second limiting component (92) includes a third limiting part (921) and a fourth limiting part (922). The third limiting part (921) is located on the side of the insulating block (5) near the light cover plate (4). The third limiting part (921) is located on the side of the light cover plate (4) near the insulating block (5). The third limiting part (921) is connected to the fourth limiting part (922).

23. The cover plate assembly (200) according to claim 13, characterized in that, The insulating block (5) has a first exhaust groove (500) on the side near the connecting block (3), and there is a gap between the first exhaust groove (500) and the connecting block (3). The first exhaust groove (500) is connected to the third clearance hole (50).

24. The cover plate assembly (200) according to claim 13, characterized in that, The spacer ring (6) is provided with a first reinforcing rib (61) on the side near the current collector (1), and the first reinforcing rib (61) is arranged along the circumference of the spacer ring (6); When the drain hole (130) is provided on the main body (10) of the collector, the drain hole (130) is located inside the first reinforcing rib (61).

25. A battery, characterized in that, include: The cover assembly (200) according to any one of claims 11-24; A battery housing that forms a receiving cavity with an opening, and a cover assembly (200) for sealing the opening; The battery cell is disposed in the receiving cavity and is electrically connected to the current collector (1).

26. An electrical appliance, characterized in that, include: The battery of claim 25; as well as, The battery is electrically connected to the electrical device.

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