Battery end cover assembly and cylindrical battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery end cover assembly and a cylindrical battery. Wherein the collector plate is arranged on the inner side, close to the roll core, of the cover plate and is connected with the cover plate in a welding manner; a positioning boss is formed on the inner side, close to the flow collecting disc, of the cover piece, a mounting through hole is formed in the flow collecting disc, the positioning boss penetrates through the mounting through hole, the positioning end of the positioning boss penetrates through the mounting through hole and extends to the side, close to the winding core, of the flow collecting disc, and a clamping hook part is formed at the positioning end of the positioning boss. And the clamping hook part is clamped on one side, close to the winding core, of the current collecting disc. In the battery end cover assembly provided by the invention, the positioning end of the positioning boss penetrates through the collector plate and extends to the roll core side, and the clamping hook part of the positioning end can be clamped on one side, close to the roll core, of the collector plate, so that the collector plate and the roll core are attached more firmly, and the occurrence of weld seam tearing caused by folding and vibration can be effectively prevented; therefore, the safety and the reliability are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery end cover assembly and a cylindrical battery. Background Art

[0002] At present, conventional cylindrical batteries include an end cover assembly, which includes components such as a current collecting plate and a cover sheet. The current collecting plate is installed on the side of the cover sheet close to the winding core and is directly connected to the top cover sheet by welding. In order to improve space utilization, the current collecting plate is often folded into the shell. However, when and after the current collecting plate is folded, the weld is often torn due to vibration and pulling. Utility Model Content

[0003] The purpose of the present application is to provide a battery end cover assembly and a cylindrical battery, which to a certain extent solves the technical problem in the prior art that the welds of cylindrical batteries are often torn due to vibration and pulling when and after the current collecting plate is folded.

[0004] The present application provides a battery end cover assembly, comprising: a cover sheet and a current collecting disk; wherein the current collecting disk is arranged on the inner side of the cover sheet close to the winding core and is connected by welding; a positioning boss is formed on the inner side of the cover sheet close to the current collecting disk, and the current collecting disk is formed with a mounting through hole, the positioning boss is penetrated by the mounting through hole, and the positioning end of the positioning boss extends through the mounting through hole to the side of the current collecting disk close to the winding core, and a hook portion is formed at the positioning end of the positioning boss, and the hook portion is clamped on the side of the current collecting disk close to the winding core.

[0005] In the above technical solution, further, the positioning boss is formed into the hook portion by riveting.

[0006] In any of the above technical solutions, further, the hook portion is connected to the positioning boss by welding.

[0007] In any of the above technical solutions, further, a welding protrusion is formed on the side of the collecting plate close to the cover plate, and the side of the welding protrusion facing away from the cover plate is concave; a mounting groove is formed on the side of the cover plate close to the collecting plate, and the welding protrusion is installed in the mounting groove and connected by welding.

[0008] In any of the above technical solutions, further, the collecting tray is formed with at least one fold line arranged sequentially along the length direction thereof, and the fold line extends along the width direction of the collecting tray, and the collecting tray can be folded along the fold line.

[0009] In any of the above technical solutions, further, the number of the fold lines is two, so as to divide the collecting plate into a top area, a middle area and a bottom main body area in sequence.

[0010] In any of the above technical solutions, further, the mounting through hole and the welding protrusion are both arranged in the top area.

[0011] In any of the above technical solutions, further, the collecting plate is formed with reinforcing ribs, and the reinforcing ribs are arranged in the middle area.

[0012] In any of the above technical solutions, further, a support portion is formed on a side of the cover sheet close to the collecting plate, and the support portion abuts against an upper surface of the folded bottom body area.

[0013] In any of the above technical solutions, further, the battery end cover assembly also includes an explosion-proof valve and an explosion-proof valve patch; wherein the cover is formed with a first mounting groove, an exhaust hole and a second mounting groove which are arranged sequentially along its outer side toward its inner side, the explosion valve patch is installed in the first mounting groove, and the explosion-proof valve is installed in the second mounting groove; an avoidance gap is formed in the bottom main body area, and the avoidance gap is located directly below the exhaust hole.

[0014] In any of the above technical solutions, further, the battery end cover assembly also includes a sealing nail, the cover sheet is formed with a liquid injection through hole, and the sealing nail is used to seal the liquid injection through hole.

[0015] In any of the above technical solutions, further, the mounting groove is formed at the center position of the cover plate.

[0016] The present application also provides a cylindrical battery, comprising a battery end cover assembly as described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery end cover assembly, which will not be described in detail herein.

[0017] In the above technical solution, further, the cylindrical battery also includes a shell, a winding core and a first battery end cover assembly; wherein the battery end cover assembly is a second battery end cover assembly; the shell is a structure with a hollow interior and openings at both ends along its height direction, the winding core is installed in the shell, and the first battery end cover assembly and the second battery end cover assembly are respectively installed at the two open ends of the shell; the first pole ear with a first polarity of the winding core is welded to the second current collecting disk of the second battery end cover assembly;

[0018] The first battery end cover assembly includes a first cover sheet, a first upper plastic, a first lower plastic, a first current collecting disk and a first pole that are assembled together, and the first cover sheet is connected to the shell by welding, the first pole is insulated from the first cover sheet through the upper plastic and the lower plastic, and the first pole is electrically connected to the second pole ear with a second polarity of the winding core through the first current collecting disk.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] In the battery end cover assembly provided in the present application, the positioning end of the positioning boss extends through the collecting disk to the winding core side, and the hook portion of the positioning end can be clamped on the side of the collecting disk close to the winding core, so that the two are more firmly attached, and the occurrence of weld tearing due to folding and vibration can be effectively prevented, thereby improving safety and reliability.

[0021] In addition, the battery end cover assembly provided in the present application is a pole-less design, which improves the space utilization inside the battery, while also reducing parts and components, thereby reducing the production cost of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 An exploded view of a battery end cover assembly provided in an embodiment of the present application;

[0024] Figure 2 An assembly diagram of a battery end cover assembly provided in an embodiment of the present application (the current collecting plate in the figure is in an unfolded state);

[0025] Figure 3 for Figure 2 Cross-sectional view along section AA;

[0026] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at C;

[0027] Figure 5 for Figure 2 Cross-sectional view along section BB;

[0028] Figure 6 for Figure 5 A schematic diagram of the enlarged structure at D;

[0029] Figure 7 A schematic diagram of the expansion of the current collecting plate provided in an embodiment of the present application;

[0030] Figure 8 Another expanded schematic diagram of the current collecting plate provided in the embodiment of the present application;

[0031] Fig. 9 Another expanded schematic diagram of the current collecting plate provided in the embodiment of the present application;

[0032] Fig.10 A schematic diagram of the structure of a cover sheet provided in an embodiment of the present application;

[0033] Fig.11 Another schematic diagram of the structure of the cover sheet provided in the embodiment of the present application;

[0034] Fig.12 Another assembly diagram of the battery end cover assembly provided in an embodiment of the present application (the current collecting plate in the diagram is in a folded state);

[0035] Fig.13 Another assembly diagram of the battery end cover assembly provided in an embodiment of the present application (the current collecting plate in the diagram is in a folded state);

[0036] Fig.14 Another assembly diagram of the battery end cover assembly provided in an embodiment of the present application (the current collecting plate in the diagram is in a folded state).

[0037] Reference numerals:

[0038] 1-cover plate, 11-positioning boss, 12-hook portion, 13-installation groove, 14-support portion, 15-first installation groove, 16-exhaust through hole, 17-second installation groove, 18-liquid injection through hole, 2-collecting plate, 21-top area, 22-middle area, 23-bottom main body area, 24-installation through hole, 25-welding protrusion, 26-fold line, 27-reinforcement rib, 28-avoidance gap, 3-explosion-proof valve, 4-explosion-proof valve patch, 5-sealing nail. DETAILED DESCRIPTION

[0039] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0040] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0041] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Refer to the following Figures 1 to 14 The battery end cover assembly and cylindrical battery according to some embodiments of the present application are described.

[0045] Embodiment 1

[0046] See also Figures 1 to 4 As shown, an embodiment of the present application provides a battery end cover assembly, comprising: a cover sheet 1 and a current collecting plate 2; wherein the current collecting plate 2 is arranged on the inner side of the cover sheet 1 close to the winding core, and is connected by welding; a positioning boss 11 is formed on the inner side of the cover sheet 1 close to the current collecting plate 2, and the current collecting plate 2 is formed with a mounting through hole 24, the positioning boss 11 is penetrated through the mounting through hole 24, and the positioning end of the positioning boss 11 extends through the mounting through hole 24 to the side of the current collecting plate 2 close to the winding core, a hook portion 12 is formed at the positioning end of the positioning boss 11, and the hook portion 12 is clamped on the side of the current collecting plate 2 close to the winding core. It can be seen that the hook portion 12 is clamped on the structure of the current collecting plate 2 located on the periphery of the mounting through hole 24.

[0047] Based on the structure described above, it can be known that the positioning end of the positioning boss 11 extends through the collecting plate 2 to the winding core side, and the hook portion 12 of the positioning end can be clamped on the side of the collecting plate 2 close to the winding core, so that the two are more firmly attached, and then the occurrence of weld tearing due to folding and vibration can be effectively prevented, thereby improving safety and reliability.

[0048] In addition, the battery end cover assembly provided in the present application is a pole-less design, which improves the space utilization inside the battery, while also reducing the number of parts and components, thereby reducing the production cost of the battery.

[0049] It should be noted that: in the process of assembling cylindrical batteries, the current collecting plate 2 in the unfolded state is first welded to the cover plate 1, and then the winding core is welded to the current collecting plate 2, and finally the current collecting plate 2 is folded to achieve the shell insertion operation. That is to say, in the final state, the current collecting plate 2 is in a folded state and installed in the shell of the cylindrical battery.

[0050] In this embodiment, preferably, Figure 4 As shown, the positioning boss 11 is formed into a hook portion 12 by riveting.

[0051] According to the structure described above, it can be known that when the positioning boss 11 of the cover plate 1 is inserted into the mounting through hole 24 of the collecting plate 2, and the positioning end of the positioning boss 11 extends to the inner side of the cover plate 1, that is, the side close to the winding core, a riveting process is adopted to hot-press the positioning end of the positioning boss 11 to form a hook portion 12, and the hook portion 12 can be firmly clamped on the side of the collecting plate 2 away from the cover plate 1, thereby strengthening the connection between the two.

[0052] Further, preferably, Fig.11 As shown, the hook portion 12 formed by the aforementioned riveting extends along the entire periphery of the positioning protrusion, increasing the contact area with the collecting plate 2 and strengthening the connection between the two. Of course, the present invention is not limited to this.

[0053] Further, preferably, Fig.11 As shown, there are two positioning bosses 11, which are arranged at intervals, and each positioning boss 11 is equipped with a hook portion 12. The number of mounting through holes 24 is equal to and corresponds to the number of positioning bosses 11. Of course, the number of positioning bosses 11 is not limited to this, and the number can also be one or more than two, such as three, four, etc., and the hook portion 12 is also adjusted accordingly.

[0054] It should be noted that: the hook portion 12 is not limited to being formed by the riveting process mentioned above, and the hook portion 12 can also be welded to the positioning end of the positioning protrusion by ultrasonic welding or laser welding, and preferably, in order to ensure the stability and firmness of the hook portion 12 and the positioning boss 11 after welding, an annular structure can be designed, and a plurality of hook portions 12 are sequentially arranged on the outer periphery of the annular structure, the annular structure is sleeved on the positioning boss 11, and is connected to the positioning boss 11 by the aforementioned welding method, and is specifically designed according to actual needs.

[0055] In this embodiment, preferably, Figures 6 to 8As shown, a welding protrusion 25 is formed on the side of the collecting plate 2 close to the cover plate 1, and the side of the welding protrusion 25 facing away from the cover plate 1 is concave; a mounting groove 13 is formed on the side of the cover plate 1 close to the collecting plate 2, and the welding protrusion 25 is installed in the mounting groove 13 and connected by welding.

[0056] According to the structure described above, the welding protrusion 25 of the collecting plate 2 can be installed in the installation groove 13 of the cover plate 1, thereby realizing the welding positioning of the collecting plate 2 and the cover plate 1, and the side of the welding protrusion 25 facing away from the cover plate is concave, thereby playing the role of thinning the welding area and facilitating penetration welding.

[0057] Furthermore, preferably, the welding protrusion 25 is matched with the mounting groove 13 to improve the assembly accuracy and welding accuracy.

[0058] Further, preferably, the number of welding protrusions 25 is one, of course, not limited to this, and the number can also be multiple, such as two, three, etc. The number of mounting grooves 13 is equal to the number of welding protrusions 25 and corresponds one to one, and is specifically designed according to actual needs.

[0059] In this embodiment, preferably, Fig. 9 , Fig.12 and Fig.13 As shown, the collecting tray 2 is formed with at least one fold line 26 arranged in sequence along the length direction thereof, and the fold line 26 extends along the width direction of the collecting tray 2 , and the collecting tray 2 can be folded along the fold line 26 .

[0060] According to the structure described above, the current collecting plate 2 is folded along the folding line 26, thereby reducing the length of the current collecting plate 2, making it easier to install it into the housing of the cylindrical battery.

[0061] Further, preferably, the fold line 26 may be a virtual line, or may be an actual line engraved or drawn on the current collecting plate 2, and may be designed according to actual needs.

[0062] In this embodiment, preferably, Fig. 9 As shown, there are two fold lines 26 to divide the collecting plate 2 into a top area 21 , a middle area 22 and a bottom body area 23 in sequence.

[0063] According to the structure described above, it is known that it is necessary to facilitate the welding of the collecting plate 2 with the pole ears of the winding core in the shell, and to facilitate the welding of the collecting plate 2 with the cover plate 1 outside the shell. Therefore, the collecting plate 2 in the unfolded state needs to have a certain length. Furthermore, for the collecting plate 2 with a certain length, it is necessary to design multiple fold lines 26 to ensure that it can be smoothly inserted into the shell after folding. Therefore, two fold lines 26 are designed in this embodiment. While meeting the requirements, it helps to reduce the length of the collecting plate 2 in the unfolded state, that is, to reduce the height of the folded collecting plate 2, reduce the space occupied by the collecting plate 2, and help to reduce the amount of material used.

[0064] Of course, the number of the fold lines 26 can be one or more than two, such as three, four, etc., which is designed according to actual needs.

[0065] In this embodiment, preferably, Figures 7 to 9 As shown, the mounting through hole 24 and the welding protrusion 25 are both disposed in the top region 21 .

[0066] According to the structure described above, the top area 21 of the folded collecting plate 2 is in contact with the cover plate 1, so the mounting through hole 24 and the welding protrusion 25 are designed near the top area 21 to improve the stability of assembly and facilitate penetration welding.

[0067] In this embodiment, preferably, Figures 7 to 9 As shown, the collecting plate 2 is formed with reinforcement ribs 27 , and the reinforcement ribs 27 are arranged in the middle area 22 .

[0068] According to the structure described above, it can be known that the space in the middle area 22 is fully utilized to design the reinforcing ribs 27 to increase the strength.

[0069] Further, preferably, the reinforcing ribs 27 extend along the length direction of the collecting plate 2 in the unfolded state.

[0070] Further, preferably, there are multiple reinforcing ribs 27 , which are sequentially arranged at intervals along the width direction of the collecting plate 2 .

[0071] In this embodiment, preferably, Figures 7 to 9 As shown, the mounting groove 13 is formed at the center of the cover plate 1 , and correspondingly, the welding protrusion 25 is formed at the center of the top area 21 of the collecting plate 2 , which helps to improve the stability and firmness of the overall assembly.

[0072] In this embodiment, preferably, Fig.11 As shown, a support portion 14 is formed on one side of the cover sheet 1 close to the collecting plate 2 , and the support portion 14 abuts against the upper surface of the folded bottom main body area 23 .

[0073] According to the structure described above, the support portion 14 plays a role in supporting the bottom main body area 23 of the collecting plate 2 to prevent the bottom main body area 23 from being deformed.

[0074] Further, preferably, the support portion 14 may be cylindrical.

[0075] Further, preferably, the number of support portions 14 may be six, four of which are arranged in a square array around the center of the cover plate 1, and the other two support portions 14 are respectively arranged on both sides of the aforementioned square array structure. Of course, the number of support portions 14 is not limited to this, and may be less than six, such as one, two, three, etc. The number of support portions 14 may also be greater than six, such as seven, eight, etc.

[0076] In this embodiment, preferably, Figure 1 , Fig.10 , Fig.11 and Fig.14 As shown, the battery end cover assembly also includes an explosion-proof valve 3 and an explosion-proof valve patch 4; wherein the cover sheet 1 is formed with a first mounting groove 15, an exhaust hole 16 and a second mounting groove 17 which are arranged in sequence along its outer side toward its inner side, the explosion valve patch is installed in the first mounting groove 15, and the explosion-proof valve 3 is installed in the second mounting groove 17; an avoidance gap 28 is formed in the bottom main body area 23, and the avoidance gap 28 is located directly below the exhaust hole 16.

[0077] According to the structure described above, the explosion-proof valve 3 plays the role of exhausting and relieving pressure, thereby improving the safety and reliability of the use of the cylindrical battery, and the explosion-proof valve patch 4 plays the role of protecting the explosion-proof valve 3.

[0078] In this embodiment, preferably, Figure 1 and Fig.13 As shown, the battery end cover assembly further includes a sealing nail 5 , and the cover sheet 1 is formed with a liquid injection through hole 18 , and the sealing nail 5 is used to seal the liquid injection through hole 18 .

[0079] According to the structure described above, the cylindrical battery can be injected with liquid through the injection hole 18, and after the injection is completed, the sealing nail 5 is used to effectively seal it.

[0080] Embodiment 2

[0081] Embodiment 2 of the present application further provides a cylindrical battery, comprising the battery end cover assembly described in the above embodiment 1, and thus, has all the beneficial technical effects of the battery end cover assembly, and the same technical features and beneficial effects are not repeated.

[0082] In this embodiment, preferably, the cylindrical battery further includes a shell, a winding core, and a first battery end cover assembly; wherein, in order to distinguish different battery end cover assemblies, the aforementioned battery end cover assembly is now named a second battery end cover assembly, and the aforementioned cover sheet 1 included in the second battery end cover assembly is a second cover sheet, and the aforementioned current collecting disk 2 included in the second battery end cover assembly is a second current collecting disk;

[0083] The shell is a structure with a hollow interior and openings at both ends along its height direction. The winding core is installed in the shell, and the first battery end cover assembly and the second battery end cover assembly are respectively installed at the two open ends of the shell; the first pole ear with a first polarity of the winding core is welded to the second current collecting disk of the second battery end cover assembly;

[0084] The first battery end cover assembly includes a first cover sheet, a first upper plastic, a first lower plastic, a first current collecting disk and a first pole that are assembled together, and the first cover sheet is connected to the shell by welding, the first pole is insulated from the first cover sheet through the upper plastic and the lower plastic, and the first pole is electrically connected to the second pole ear with a second polarity of the winding core through the first current collecting disk. It can be seen that the first battery end cover assembly belongs to a structure commonly used in the prior art and will not be described in detail here.

[0085] According to the structure described above, the shell, the first cover plate, the second cover plate, the second current collecting disk and the first pole ear of the winding core are connected, so they all have the first polarity, and the second pole is connected to the second pole ear of the winding core and has the second polarity, thereby realizing positive and negative output. It can be seen that the pole-free design of the battery end cover at one end of the cylindrical battery improves the space utilization inside the battery, while also reducing parts and components, reducing the production cost of the battery.

[0086] Among them, preferably, the first polarity can be positive and the second polarity can be negative. Of course, it is not limited to this and can be selected according to actual needs.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery end cap assembly, characterized in that: include: A cover plate and a current collecting plate; wherein the current collecting plate is arranged on the inner side of the cover plate close to the winding core and is connected by welding; a positioning boss is formed on the inner side of the cover plate close to the current collecting plate, and the current collecting plate is formed with a mounting through hole, the positioning boss is passed through the mounting through hole, and the positioning end of the positioning boss extends through the mounting through hole to the side of the current collecting plate close to the winding core, the positioning end of the positioning boss is formed with a hook portion, and the hook portion is clamped on the side of the current collecting plate close to the winding core.

2. The battery end cap assembly according to claim 1, characterized in that: The positioning boss is formed into the hook portion by riveting; or The hook portion is connected to the positioning boss by welding.

3. The battery end cap assembly according to claim 1, characterized in that: A welding protrusion is formed on one side of the current collecting plate close to the cover plate, and the side of the welding protrusion facing away from the cover plate is concave; a mounting groove is formed on one side of the cover plate close to the current collecting plate, and the welding protrusion is installed in the mounting groove and connected by welding.

4. The battery end cap assembly according to claim 3, characterized in that: The current collecting plate is formed with at least one folding line arranged sequentially along the length direction thereof, and the folding line extends along the width direction of the current collecting plate, and the current collecting plate can be folded along the folding line.

5. The battery end cap assembly according to claim 4, characterized in that: The number of the fold lines is two, so as to sequentially divide the collecting plate into a top area, a middle area and a bottom main body area.

6. The battery end cap assembly according to claim 5, characterized in that: The mounting through hole and the welding protrusion are both arranged in the top area; and / or The collecting plate is formed with reinforcing ribs, and the reinforcing ribs are arranged in the middle area.

7. The battery end cap assembly according to claim 5, characterized in that: A support portion is formed on one side of the cover sheet close to the current collecting plate, and the support portion abuts against the upper surface of the folded bottom body area; and / or The battery end cover assembly also includes an explosion-proof valve and an explosion-proof valve patch; wherein the cover plate is formed with a first mounting groove, an exhaust hole and a second mounting groove which are arranged sequentially along its outer side toward its inner side, the explosion valve patch is installed in the first mounting groove, and the explosion-proof valve is installed in the second mounting groove; an avoidance gap is formed in the bottom main body area, and the avoidance gap is located directly below the exhaust hole.

8. The battery end cap assembly according to claim 3, characterized in that: The mounting groove is formed at the center of the cover sheet.

9. The battery end cap assembly according to any one of claims 1 to 8, characterized in that: The battery end cover assembly further comprises a sealing nail, the cover sheet is formed with a liquid injection through hole, and the sealing nail is used to seal the liquid injection through hole.

10. A cylindrical battery, characterized in that: It comprises a shell, a winding core, a first battery end cap assembly and a battery end cap assembly as claimed in any one of claims 1 to 9, and the battery end cap assembly is a second battery end cap assembly; wherein the shell is a structure with a hollow interior and openings at both ends along its height direction, the winding core is installed in the shell, and the first battery end cap assembly and the second battery end cap assembly are respectively installed at the two open ends of the shell; the first pole ear with a first polarity of the winding core is welded to the second current collecting disk of the second battery end cap assembly; The first battery end cover assembly includes a first cover sheet, a first upper plastic, a first lower plastic, a first current collecting disk and a first pole that are assembled together, and the first cover sheet is connected to the shell by welding, the first pole is insulated from the first cover sheet through the upper plastic and the lower plastic, and the first pole is electrically connected to the second pole ear with a second polarity of the winding core through the first current collecting disk.

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