Cylindrical battery positive electrode cover plate assembly and cylindrical battery

Abstract

The utility model discloses a cylindrical battery positive electrode cover plate assembly and a cylindrical battery, and belongs to the technical field of batteries and battery accessories. The cylindrical battery positive electrode cover plate assembly comprises a positive electrode post, a positive electrode adapter plate, a positive electrode cover plate, a polar plate and a C-shaped sealing ring, the C-shaped sealing ring sleeves the periphery of the upper part of an assembly column of the positive electrode post, and a circumferential opening of the C-shaped sealing ring faces outwards; the circumferential edge of the pole penetrating hole of the positive pole cover plate is embedded into the circumferential opening of the C-shaped sealing ring; and the C-shaped sealing rings form sealing between the pole cap of the positive pole and the upper end of the positive pole cover plate, between the circumferential edge of the pole penetrating hole and the periphery of the upper part of the assembly column, and between the lower end of the positive pole cover plate and the upper end of the positive pole adapter plate. The utility model has the advantages of simple structure and convenient assembly. In addition, in the cylindrical battery positive electrode cover plate assembly provided by the utility model, the stability and the yield are higher by adopting the riveting forming mode and the structure. In addition, the cylindrical battery applying the positive electrode cover plate assembly of the cylindrical battery also inherits the beneficial effects.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries and battery accessories, and specifically relates to a cylindrical battery positive electrode cover plate assembly and a corresponding cylindrical battery. Background Art

[0002] Cylindrical batteries generally include a shell, a battery cell, a positive electrode cover plate assembly and a negative electrode cover plate assembly. The shell is a cylindrical side enclosure, the negative electrode cover plate assembly is assembled at the bottom of the shell, the battery cell is arranged inside the shell, and the positive electrode cover plate assembly is assembled at the top of the shell. Cylindrical batteries are suitable for mass production, have good heat dissipation performance, and the closed cylindrical structure can provide high bending strength and is not easy to explode; therefore, cylindrical batteries have always had a very wide range of application needs.

[0003] Combination Figure 1 and Figure 2 As shown, an existing positive electrode cover plate assembly includes a positive electrode column 1, a column positioning ring 2, a sealing ring 3, a positive electrode cover plate 5, a positive electrode adapter plate 4, an isolation positioning ring 6, and a plate 7. The positive electrode cover plate 5 is provided with a column through hole 51, and a cap positioning groove 52 is provided on the upper surface of the positive electrode cover plate 5 around the column through hole; Figure 3 and Figure 4 As shown, the positive pole 1 includes an assembly column 11 and a pole cap 12 arranged on the top of the assembly column 11. The assembly column 11 passes through the pole hole 51, and a sealing ring 3 is arranged between the outer periphery of the assembly column 11 and the inner wall of the pole hole 51. The pole cap 12 is arranged at the pole cap positioning groove 52 through the pole positioning ring 2. In addition, the lower periphery of the assembly column 11 of the positive pole 1 is connected to the positive electrode adapter plate 4; the isolation positioning ring 6 is sleeved on the assembly column 11 and is located between the lower end of the positive cover plate 5 and the upper end of the positive electrode adapter plate 4. The upper periphery of the pole plate 7 is welded and fixed to the positive electrode adapter plate 4, and the pole plate 7 is further electrically connected to the positive electrode of the battery cell.

[0004] The assembly column 11 of the positive electrode column 1 is fixed to the outer periphery of the assembly column 11 by a riveting process. Figure 3 As shown, the assembly column 11 of the positive electrode column 1 includes a cover plate sleeve position 111 located at the upper section and an adapter plate sleeve position 112 located at the lower section. The adapter plate sleeve position 112 is narrower than the cover plate sleeve position 111. In addition, before the positive electrode column 1 is riveted, the lower end edge of the assembly column 11 is protruding downward with a riveting deformation portion 113a. Figure 1 , Figure 3 and Figure 4 First, the pole positioning ring 2, the sealing ring 3, the isolation positioning ring 6, and the positive electrode adapter plate 4 are arranged on the outer periphery of the assembly column 11 from top to bottom, and the positive electrode cover plate 5 is arranged on the outer periphery of the sealing ring 3; then, the riveting deformation part 113a is riveted to deform it upward and outward, so as to form a Figure 4The clamping portion 113b shown presses the edge of the inner hole 41 of the positive adapter plate 4 against the adapter plate sleeve position 112, and at the same time clamps the isolation positioning ring 6, the positive cover plate 5, the sealing ring 3, and the pole positioning ring 2 between the positive adapter plate 4 and the pole cap 12 of the positive pole 1.

[0005] However, in the positive electrode cover plate assembly of the above structure, the pole locating ring 2, the sealing ring 3 and the isolation locating ring 6 are all "L" or inverted "L" shaped in cross section, which makes the positive electrode cover plate assembly have more components, the overall structure is more complicated, and the assembly and yield rate are more difficult to control. In addition, in the positive electrode cover plate assembly of the above structure, the riveted deformation part 113a protruding at the lower edge of the positive pole 1 occupies a large space inside the battery, and the riveting operation surface is also large, and such a structure is prone to cause a high rate of product sealing defects during riveting. Utility Model Content

[0006] The first object of the utility model is to provide a cylindrical battery positive electrode cover assembly, aiming to improve the assembly efficiency of the positive electrode cover assembly. The first object of the utility model is achieved by the following technical solutions:

[0007] A cylindrical battery positive cover assembly, comprising a positive pole, a positive adapter plate, a positive cover and a plate, the positive pole comprising an assembly column and a pole cap arranged at the top of the assembly column, the positive cover is provided with a pole hole, the positive adapter plate is sleeved on the lower periphery of the assembly column, and the plate is connected to the bottom of the positive adapter plate; it is characterized in that it also comprises a C-shaped sealing ring with a circumferential opening facing outward, sleeved on the upper periphery of the assembly column; the circumferential edge of the pole hole is embedded in the circumferential opening of the C-shaped sealing ring; the C-shaped sealing ring forms a seal between the pole cap and the upper end of the positive cover, between the circumferential edge of the pole hole and the upper periphery of the assembly column, and between the lower end of the positive cover and the upper end of the positive adapter.

[0008] As a preferred technical solution, the positive electrode column is a riveted part; before riveting, the assembly column is a single-step column; after riveting, the lower end of the assembly column forms a limiting flange that clamps the positive electrode adapter plate upward.

[0009] As a preferred technical solution, the positive electrode column is a riveted part; before riveting, the assembly column is a single-step column; after riveting, a drum-shaped deformation portion is formed on the upper part of the assembly column to tighten the C-type sealing ring outward.

[0010] As a preferred technical solution, the C-shaped sealing ring includes: an upper transverse sealing sheet, a middle longitudinal sealing sheet and a lower transverse sealing sheet, the upper part of the middle longitudinal sealing sheet is connected to the inner side of the upper transverse sealing sheet, and the inner side of the lower transverse sealing sheet is connected to the lower part of the middle longitudinal sealing sheet; the upper transverse sealing sheet forms a seal between the pole cap and the upper end of the positive cover plate, the middle longitudinal sealing sheet forms a seal between the circumferential edge of the pole through hole and the upper periphery of the assembly column, and the lower transverse sealing sheet forms a seal between the lower end of the positive cover plate and the upper end of the positive adapter plate.

[0011] As a preferred technical solution, a pole cap positioning groove is provided on the upper surface of the positive electrode cover plate around the pole penetration hole, and the pole cap is located above the pole cap positioning groove.

[0012] As a preferred technical solution, the C-shaped sealing ring also includes a top longitudinal sealing sheet, the lower part of which is connected to the outer side of the upper transverse sealing sheet; the top longitudinal sealing sheet wraps the outer periphery of the pole cap to form a seal between the outer periphery of the pole cap and the side wall of the pole cap positioning groove.

[0013] As a preferred technical solution, the upper transverse sealing sheet, the middle longitudinal sealing sheet, the lower transverse sealing sheet and the top longitudinal sealing sheet are integrally formed.

[0014] As a preferred technical solution, the cylindrical battery positive cover plate assembly also includes an isolation positioning gasket, which is clamped between the lower end of the positive cover plate and the upper end of the positive adapter plate, and is located on the periphery of the lower transverse sealing sheet.

[0015] As a preferred technical solution, positioning holes are respectively provided on the positive cover plate and the positive adapter plate; and positioning protrusions embedded in the positioning holes are respectively provided on the upper and lower surfaces of the isolation positioning gasket corresponding to the positioning holes.

[0016] The second object of the present invention is to provide a cylindrical battery, aiming to improve the assembly efficiency of the battery.

[0017] The second purpose of the utility model is achieved by the following technical solutions:

[0018] A cylindrical battery comprises a shell, a battery cell, a positive electrode cover plate assembly and a negative electrode cover plate assembly, wherein the shell is a cylindrical side enclosure, the negative electrode cover plate assembly is assembled at the bottom of the shell, the battery cell is arranged inside the shell, and the positive electrode cover plate assembly is assembled at the top of the shell; it is characterized in that the positive electrode cover plate assembly adopts the cylindrical battery positive electrode cover plate assembly described above.

[0019] The cylindrical battery positive electrode cover plate assembly provided by the above technical solution of the utility model realizes sealing at least three places through a C-shaped sealing ring. Compared with multiple devices such as pole positioning rings, sealing rings and isolation positioning rings used in the prior art, the structure is simpler and the assembly is more convenient. In addition, the cylindrical battery positive electrode cover plate assembly provided by the utility model can more reliably connect the positive electrode cover plate to the positive electrode adapter plate through riveting and / or through isolation positioning washers. In addition, the riveting molding method and structure used in the cylindrical battery positive electrode cover plate assembly provided by the utility model have higher stability and yield rate. Finally, the cylindrical battery using the cylindrical battery positive electrode cover plate assembly of the utility model naturally inherits the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a longitudinal cross-sectional view of an existing exemplary cylindrical battery positive electrode cover assembly.

[0021] Figure 2 It is a longitudinal cross-sectional exploded view of an existing exemplary cylindrical battery positive electrode cover assembly.

[0022] Figure 3 It is a longitudinal cross-sectional view of a positive electrode column in an existing exemplary cylindrical battery positive electrode cover assembly before riveting.

[0023] Figure 4 It is a longitudinal cross-sectional view of a positive electrode column in an existing exemplary cylindrical battery positive electrode cover assembly before riveting.

[0024] Figure 5 A side view of a cylindrical battery positive electrode cover assembly provided in Example 1 of the utility model.

[0025] Figure 6 This is a bottom view of the cylindrical battery positive electrode cover assembly provided in Example 1 of the utility model.

[0026] Figure 7 for Figure 6 AA cross-sectional view of the positive electrode cover assembly of the cylindrical battery shown.

[0027] Figure 8 This is a longitudinal cross-sectional view of the positive electrode column, positive electrode cover plate, C-shaped sealing ring and positive electrode adapter plate in the cylindrical battery positive electrode cover plate assembly provided in Example 1 of the utility model in a disassembled state.

[0028] Fig. 9 A longitudinal cross-sectional view of a positive electrode cover plate in a cylindrical battery positive electrode cover plate assembly provided in Example 1 of the utility model, in which the positive electrode cover plate is matched with a C-shaped sealing ring.

[0029] Fig.10 A longitudinal cross-sectional view of the changing states of the positive pole post in the cylindrical battery positive cover plate assembly provided in Example 1 of the utility model before and after riveting.

[0030] Fig.11 A partially exploded longitudinal cross-sectional view of a cylindrical battery positive electrode cover assembly provided in Example 2 of the present utility model.

[0031] Fig.12 This is a longitudinal cross-sectional view of the cylindrical battery positive electrode cover assembly provided in Example 2 of the utility model.

[0032] Fig.13 It is a longitudinal cross-sectional view of the changing states of the positive electrode column in an existing exemplary cylindrical battery positive electrode cover assembly before and after riveting.

[0033] Description of Figure Numbers:

[0034] 1. Numbers involved in background technology: 1-positive pole, 11-assembly pole, 12-pole cap, 111-cover plate sleeve position, 112-adapter plate sleeve position, riveted deformation portion 113a, clamping portion 113b 2-pole positioning ring, 3-sealing ring, 4-positive adapter plate, 5-positive cover plate, 6-isolating positioning ring, 7-pole plate, 51-pole penetration hole, 52-pole cap positioning groove.

[0035] 2. Numbers involved in the specific implementation methods: 10-positive pole, 101-assembly pole, 102-pole cap, 103-limiting flange, 104-riveted stress groove, 105-drum-shaped deformation portion, 20-C-type sealing ring, 201-upper horizontal sealing sheet, 202-middle longitudinal sealing sheet, 203-lower horizontal sealing sheet, 204-top longitudinal sealing sheet, 40-positive pole adapter plate, 401 middle hole, 402-make way groove, 409-positioning hole, 50-positive pole cover plate, 501-pole pole penetration hole, 502-pole cap positioning groove, 509-positioning hole, 604-positioning protrusion 605-positioning protrusion, 70-plate, 701-central through hole, 702-hollow mouth. DETAILED DESCRIPTION

[0036] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0037] In the description of the present utility model, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise", "front", "back", etc., indicating directions or positional relationships, are based on the directions or relative positional relationships shown in the accompanying drawings, and are intended to facilitate a clear description of the structure of the product or device, and are not used to limit the actual directions of the product or device during production, use, sales, etc.

[0038] In addition, the terms "first" and "second" are only used for the purpose of distinction in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "set", "fix", "assemble" and the like 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 an indirect connection 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 the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] Embodiment 1

[0042] Combination Figure 5 , Figure 6 and Figure 7As shown, the cylindrical battery positive cover plate assembly provided in the first embodiment includes a positive electrode column 10, a C-type sealing ring 20, a positive electrode adapter plate 40, a positive electrode cover plate 50, and a plate 70. The specific structure of these components and their coordination relationship will be clearly and completely described below.

[0043] Combination Fig.10 As shown, the positive electrode column 10 includes an assembly column 101 and a pole cap 102 disposed on the top of the assembly column 101, and the assembly column 101 is a single-step column before riveting. Figure 8 As shown, the positive electrode cover plate 50 is an injection molded part, and a pole hole 501 is provided in the center of the positive electrode cover plate 50 from top to bottom. Meanwhile, a pole cap positioning groove 502 is provided on the upper surface of the positive electrode cover plate 50 around the pole hole 501 .

[0044] The C-shaped sealing ring 20 is a C-shaped sealing ring with a circumferential opening facing outward. Figure 8 As shown, the C-shaped sealing ring 20 comprises: an upper transverse sealing piece 201, a middle longitudinal sealing piece 202 and a lower transverse sealing piece 203, wherein the upper portion of the middle longitudinal sealing piece 202 is connected to the inner side of the upper transverse sealing piece 201, and the inner side of the lower transverse sealing piece 203 is connected to the lower portion of the middle longitudinal sealing piece 202. In the C-shaped sealing ring 20 of this embodiment, the upper transverse sealing piece 201, the middle longitudinal sealing piece 202 and the lower transverse sealing piece 203 are integrally formed.

[0045] Continue to see Figure 7 As shown, the C-shaped sealing ring 20 described above is sleeved on the upper periphery of the assembly column 101, and the circumferential edge of the pole through hole 501 of the positive electrode cover plate 50 is embedded in the circumferential opening of the C-shaped sealing ring 20, combined with Fig. 9 At this time, the assembly column 101 passes through the pole hole 501 of the positive cover plate 50, and the pole cap 12 is located at the pole cap positioning groove 502. In addition, the positive electrode adapter plate 40 is sleeved on the lower periphery of the assembly column 101, and the upper periphery of the pole plate 70 is fixedly welded to the positive electrode adapter plate 40.

[0046] In this way, the C-shaped sealing ring 20 forms three seals between the pole cap 102 and the upper end of the positive electrode cover plate 50, between the circumferential edge of the pole hole 501 and the upper periphery of the assembly column 101, and between the lower end of the positive electrode cover plate 50 and the upper end of the positive electrode adapter plate 40. Specifically, the upper transverse sealing sheet 201 forms a seal between the pole cap 102 and the upper end of the positive electrode cover plate 50, the middle longitudinal sealing sheet 202 forms a seal between the circumferential edge of the pole hole 501 and the upper periphery of the assembly column 101, and the lower transverse sealing sheet 203 forms a seal between the lower end of the positive electrode cover plate 50 and the upper end of the positive electrode adapter plate 40.

[0047] As a preferred embodiment, see Figure 8As shown, the C-shaped sealing ring 20 also includes a top longitudinal sealing piece 204, and the lower part of the top longitudinal sealing piece 204 is connected to the outer side of the upper transverse sealing piece 201. In the C-shaped sealing ring 20 of this embodiment, the upper transverse sealing piece 201, the middle longitudinal sealing piece 202, the lower transverse sealing piece 203 and the top longitudinal sealing piece 204 are integrally formed. In this way, the top longitudinal sealing piece 204 can wrap the outer periphery of the pole cap 102, forming another seal between the outer periphery of the pole cap 102 and the side wall of the pole cap positioning groove 502.

[0048] Continue to see Figure 7 As shown, the cylindrical battery positive electrode cover plate assembly provided in the first embodiment further includes an isolation positioning gasket 60, which is sandwiched between the lower end of the positive electrode cover plate 50 and the upper end of the positive electrode adapter plate 40. Specifically, the isolation positioning gasket 60 is located at the periphery of the lower transverse sealing sheet 203; in addition, the positive electrode cover plate 50 and the positive electrode adapter plate 40 are provided with positioning holes 509 and positioning holes 409 in a corresponding manner; the upper and lower surfaces of the isolation positioning gasket 60 correspond to the positioning holes 509 and the positioning holes 409, respectively, and the positioning protrusions 605 and positioning protrusions 604 (combined with the positioning protrusions 605 and 604) are provided. Figure 6 In this way, the isolation positioning gasket 60 and the positive electrode cover plate 50 and the positive electrode adapter plate 40 form a foolproof positioning, which is convenient for assembly and synchronously stops rotation, and enhances the anti-torsion structural strength of the positive electrode cover plate assembly.

[0049] See also Figure 8 As shown, a clearance groove 402 is provided at the lower edge of the middle hole 401 of the positive electrode adapter plate 40; Figure 7 and Fig.10 As shown, after the C-shaped sealing ring 20, the positive cover plate 50, and the positive adapter plate 40 are assembled on the positive electrode column 10, a riveting pressure is applied from the bottom center of the positive electrode column 10; under the action of the riveting pressure, the positive electrode column 10 is deformed, and a limiting flange 103 is formed outward at the position of the give way groove 402, that is, at the lower end of the assembly column 101, and a riveting pressure groove 104 is formed at the center of the lower end of the assembly column 101. Fig.10 As shown, the limiting flange 103 is clamped at the lower end of the positive electrode adapter plate 40, thereby fixing the positive electrode adapter plate 40, the isolation positioning gasket 60, the positive electrode cover plate 50 and the C-shaped sealing ring 20 on the positive electrode column 10.

[0050] After the riveting is completed, the upper part of the outer periphery of the electrode plate 70 is fixedly welded to the positive electrode adapter plate 40. Figure 6 As shown, the electrode plate 70 is provided with a central through hole 701 and a plurality of hollow openings 702 surrounding the central through hole 701 .

[0051] As mentioned above, the positive pole 10 is riveted once after assembling other components, but it is emphasized here that riveting is to strengthen the assembly structure, but it is not a necessary or only technical means. It is understandable that the positive electrode adapter plate 40, the isolation positioning gasket 60, the positive electrode cover plate 50 and the C-type sealing ring 20 can be fixedly assembled on the positive pole 10 by sufficiently large friction or interference fit or snap fit.

[0052] As can be seen from the above, the cylindrical battery positive electrode cover plate assembly provided in the first embodiment realizes sealing at least three places through a C-shaped sealing ring 20. Compared with the multiple sealing rings, isolation rings and other devices used in the prior art, the structure is simpler and the assembly is more convenient. In addition, the cylindrical battery positive electrode cover plate assembly provided in the first embodiment applies riveting pressure from the bottom center of the positive electrode column 10, and with the cooperation of the clearance groove 402, a limiting flange 103 is formed outward at the lower end of the assembly column 101, the riveting operation points are more concentrated, and the stability and yield rate of the limiting flange 103 are higher.

[0053] Embodiment 2

[0054] Combination Fig.11 , Fig.12 and Fig.13 As shown, the cylindrical battery positive cover plate assembly provided in the second embodiment is different from that in the first embodiment in that: the lower edge of the middle hole 401 of the positive adapter plate 40 no longer has a make way groove 402; after the C-type sealing ring 20, the positive cover plate 50, and the positive adapter plate 40 are assembled on the positive electrode column 10, the lower end of the assembly column 101 protrudes from the lower end of the positive adapter plate 40 by 0.1 to 0.4 mm; then, a riveting pressure is applied from the bottom of the positive electrode column 10 as a whole until the lower end of the assembly column 101 is flush with the lower end of the positive adapter plate 40; under the action of the riveting pressure, the positive electrode column 10 is deformed, and a drum-shaped deformation portion 105 is formed outward at the position of the C-type sealing ring 20.

[0055] In the second embodiment, the formation of the drum-shaped deformation portion 105 can make the C-shaped sealing ring 20 more firmly sleeved on the upper periphery of the assembly column 101 of the positive electrode column 10, and also make the relative assembly relationship between the positive electrode cover plate 50 and the positive electrode column 10 more stable. The assembly relationship between the positive electrode adapter plate 40 and the positive electrode cover plate 50 can be achieved by the connection mechanism of the accessories between each other; or, it can be achieved by providing the upper and lower surfaces of the isolation positioning gasket 60 mentioned in the first embodiment with positioning protrusions 605 and positioning protrusions 604, and the corresponding positioning holes 509 and positioning holes 409 on the positive electrode cover plate 50 and the positive electrode adapter plate 40 are snap-fitted or interference-fitted.

[0056] Embodiment 3

[0057] Embodiment 3 provides a cylindrical battery, including a housing, a battery cell, a positive electrode cover plate assembly and a negative electrode cover plate assembly, wherein the housing is a cylindrical side enclosure, the negative electrode cover plate assembly is assembled at the bottom of the housing, the battery cell is arranged inside the housing, and the positive electrode cover plate assembly is assembled at the top of the housing. Among them, the positive electrode cover plate assembly adopts the cylindrical battery positive electrode cover plate assembly provided in Embodiment 1 or Embodiment 2.

[0058] The above embodiments are only intended to fully disclose but not limit the present invention. Any replacement of equivalent technical features based on the creative purpose of the present invention without creative labor should be regarded as the scope disclosed in this application.

Claims

1. A positive cover plate assembly for a cylindrical battery, comprising a positive pole column, a positive adapter plate, a positive cover plate and a plate, wherein the positive pole column comprises an assembly column and a pole cap arranged at the top of the assembly column, the positive cover plate is provided with a pole column through hole, the positive adapter plate is sleeved on the lower periphery of the assembly column, and the plate is connected to the bottom of the positive adapter plate; characterized in that: It also includes a C-shaped sealing ring with a circumferential opening facing outward, which is sleeved on the upper outer periphery of the assembly column; the circumferential edge of the pole through-hole is embedded in the circumferential opening of the C-shaped sealing ring; the C-shaped sealing ring forms a seal between the pole cap and the upper end of the positive cover plate, between the circumferential edge of the pole through-hole and the upper outer periphery of the assembly column, and between the lower end of the positive cover plate and the upper end of the positive adapter plate.

2. The cylindrical battery positive electrode cover assembly according to claim 1, characterized in that: The positive electrode column is a riveted part; before riveting, the assembly column is a single-step column; after riveting, the lower end of the assembly column forms a limiting flange that clamps the positive electrode adapter plate upward.

3. The cylindrical battery positive electrode cover assembly according to claim 1, characterized in that: The positive pole column is a riveted part; before riveting, the assembly column is a single-step column; after riveting, a drum-shaped deformation part is formed on the upper part of the assembly column to tighten the C-shaped sealing ring outward.

4. The cylindrical battery positive electrode cover assembly according to any one of claims 1 to 3, characterized in that: The C-shaped sealing ring includes: an upper transverse sealing sheet, a middle longitudinal sealing sheet and a lower transverse sealing sheet, the upper part of the middle longitudinal sealing sheet is connected to the inner side of the upper transverse sealing sheet, and the inner side of the lower transverse sealing sheet is connected to the lower part of the middle longitudinal sealing sheet; the upper transverse sealing sheet forms a seal between the pole cap and the upper end of the positive cover plate, the middle longitudinal sealing sheet forms a seal between the circumferential edge of the pole through hole and the upper periphery of the assembly column, and the lower transverse sealing sheet forms a seal between the lower end of the positive cover plate and the upper end of the positive adapter plate.

5. The cylindrical battery positive electrode cover assembly according to claim 4, characterized in that: The upper surface of the positive electrode cover plate is provided with a pole cap positioning groove around the pole through hole, and the pole cap is located above the pole cap positioning groove.

6. The cylindrical battery positive electrode cover assembly according to claim 5, characterized in that: The C-shaped sealing ring also includes a top longitudinal sealing sheet, the lower part of which is connected to the outer side of the upper transverse sealing sheet; the top longitudinal sealing sheet wraps the outer periphery of the pole cap to form a seal between the outer periphery of the pole cap and the side wall of the pole cap positioning groove.

7. The cylindrical battery positive electrode cover assembly according to claim 6, characterized in that: The upper transverse sealing sheet, the middle longitudinal sealing sheet, the lower transverse sealing sheet and the top longitudinal sealing sheet are integrally formed.

8. The cylindrical battery positive electrode cover plate assembly according to claim 4, characterized in that: It also includes an isolation positioning gasket, which is clamped between the lower end of the positive electrode cover plate and the upper end of the positive electrode adapter plate and is located on the periphery of the lower transverse sealing sheet.

9. The cylindrical battery positive electrode cover assembly according to claim 8, characterized in that: Positioning holes are respectively provided on the positive electrode cover plate and the positive electrode adapter plate in a corresponding manner; and positioning protrusions embedded in the positioning holes are provided on the upper and lower surfaces of the isolation positioning gasket.

10. A cylindrical battery, comprising a housing, a battery cell, a positive electrode cover plate assembly and a negative electrode cover plate assembly, wherein the housing is a cylindrical side enclosure, the negative electrode cover plate assembly is assembled at the bottom of the housing, the battery cell is arranged inside the housing, and the positive electrode cover plate assembly is assembled at the top of the housing; characterized in that: The positive electrode cover plate assembly adopts the cylindrical battery positive electrode cover plate assembly according to any one of claims 1 to 9.

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