Cylindrical battery cover plate and cylindrical battery

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a cylindrical battery cover plate and a cylindrical battery, the cylindrical battery cover plate comprises a top cover piece and a first plastic part, the top cover piece is provided with an annular limiting groove, the groove bottom of the annular limiting groove comprises a plurality of first limiting surfaces with gradients, a first transition surface is formed between every two adjacent first limiting surfaces, and a second transition surface is formed between every two adjacent first limiting surfaces. The end face of the side, facing the top cover piece, of the first plastic part comprises a plurality of second limiting faces with gradients, a second transition face is formed between every two adjacent second limiting faces, the first limiting faces are tightly attached to the second limiting faces, and the first transition faces are tightly attached to the second transition faces. When the first plastic part is subjected to a rotating force relative to the top cover piece, the first transition surface abuts against the second transition surface, so that the first plastic part is prevented from rotating relative to the top cover piece, the risk of short circuit is avoided, and the safety is high. The utility model further provides the cylindrical battery which comprises the cylindrical battery cover plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a cylindrical battery cover plate and cylindrical battery. BACKGROUND

[0002] Cylindrical battery is a common battery structure in lithium battery, is widely used in new energy vehicles, is used for providing power for the travel of new energy vehicles. Generally speaking, cylindrical battery cover plate includes insulating piece, cover plate and pole, and the insulating piece is arranged between the cover plate and the pole to prevent the pole and the cover plate from short circuiting. But because the insulating piece in cylindrical battery cover plate is generally circular ring structure, when the insulating piece is assembled with the pole and the cover plate, the insulating piece can rotate relative to the cover plate, and then the position of the insulating piece is offset, and there is a short circuit risk.

[0003] Therefore, it is urgent to provide a cylindrical battery cover plate and cylindrical battery to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of cylindrical battery cover plate and cylindrical battery, there is limiting structure between its first plastic piece and top cover sheet, so that the positioning between first plastic piece and top cover sheet is accurate, assembly yield is high, and first plastic piece is not easy to rotate relative to top cover sheet, avoid short circuit risk, and safety is higher.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, the utility model provides a kind of cylindrical battery cover plate, comprising:

[0007] Top cover sheet, the annular limiting groove is equipped on the top cover sheet, the groove bottom of the annular limiting groove includes a plurality of first limiting surfaces with slope, a plurality of the first limiting surfaces are sequentially connected head to tail, and first transition surface is formed between adjacent two first limiting surfaces;

[0008] First plastic piece, the end face of the first plastic piece towards the top cover sheet side includes a plurality of second limiting surfaces with slope, a plurality of the second limiting surfaces are sequentially connected head to tail, and second transition surface is formed between adjacent two second limiting surfaces, the first limiting surface and the second limiting surface are attached, and first transition surface and second transition surface are attached.

[0009] Optionally, the first limiting surface includes head and tail, and the distance between the first limiting surface and the end face of the top cover sheet away from the side of the first plastic piece gradually increases in the direction from the head of the first limiting surface to the tail of the first limiting surface.

[0010] Optionally, the first limiting surface is provided with four, the four first limiting surfaces are the same in shape, and each of the first limiting surfaces has an inner side edge with a central angle of 90 degrees.

[0011] The second limiting surface is provided with four, the second limiting surface corresponds to the first limiting surface one by one, the four second limiting surfaces are the same in shape, and each of the second limiting surfaces has an inner side edge with a central angle of 90 degrees.

[0012] Optionally, the cylindrical battery cover plate comprises a pole and a second plastic part, the second plastic part is located on a side of the top cover sheet away from the first plastic part, the pole comprises a plate body part, a column body part and a fixing rim connected with each other, the plate body part is located on a side of the first plastic part away from the top cover sheet, the column body part is arranged through the first plastic part, the top cover sheet and the second plastic part, and the fixing rim is used for pressing the second plastic part against the top cover sheet.

[0013] Optionally, the cylindrical battery cover plate comprises a sealing part, the sealing part is sleeved on the column body part, and the sealing part is clamped between the fixing rim and the second plastic part in the axial direction of the column body part.

[0014] Optionally, the top cover sheet is provided with a first mounting hole, the first plastic part is provided with a second mounting hole, the second plastic part is provided with a third mounting hole, the column body part is arranged through the second mounting hole, the first mounting hole and the third mounting hole in sequence, the second plastic part is provided with a limiting flange, the limiting flange is located in the circumferential direction of the third mounting hole, and the limiting flange extends towards the top cover sheet and extends into the first mounting hole.

[0015] Optionally, a containing groove is arranged on a side of the first plastic part away from the top cover sheet, and at least part of the plate body part is located in the containing groove.

[0016] Optionally, a plurality of protrusions are arranged on a groove wall of the containing groove, the plurality of protrusions are arranged at intervals in the circumferential direction of the first plastic part, and the protrusions abut against the circumferential wall of the plate body part.

[0017] Optionally, the cylindrical battery cover plate further comprises a supporting part, the supporting part is sleeved on the column body part, and the supporting part is clamped between the top cover sheet and the first plastic part in the axial direction of the column body part.

[0018] In another aspect, the utility model provides a cylindrical battery which comprises the cylindrical battery cover plate according to any one of the above-mentioned schemes.

[0019] The utility model has the advantages of:

[0020] The utility model provides a cylindrical battery cover plate, including top cover piece and first plastic piece, top cover piece one side's end surface towards first plastic piece is equipped with annular limit slot, and the at least part of first plastic piece is embedded in annular limit slot. The groove bottom of annular limit slot includes a plurality of first limit surface with gradient, and a plurality of first limit surface is connected in turn, and the first limit surface between adjacent two forms first transition surface, and the end surface of first plastic piece one side towards top cover piece includes a plurality of second limit surface with gradient, and a plurality of second limit surface is connected in turn, and the second limit surface between adjacent two forms second transition surface, after the assembly of cylindrical battery cover plate, first limit surface and second limit surface are closely combined, and first transition surface and second transition surface are closely combined. When first plastic piece is subjected to the force of counterclockwise rotation relative to top cover piece, first transition surface can abut with second transition surface, to prevent first plastic piece from rotating relative to top cover piece, avoid short circuit risk, and the safety is higher. And the positioning between first plastic piece and top cover piece is accurate, and the assembly yield is high.

[0021] The utility model also provides a cylindrical battery, including above-mentioned cylindrical battery cover plate. By adopting above-mentioned cylindrical battery cover plate, can prevent first plastic piece from rotating relative to top cover piece under the condition of guaranteeing its conductivity, strengthens the safety design of cylindrical battery, satisfies the requirement of battery safety, and the service life is longer, and the reliability is higher, and the assembly difficulty is low, and the raw material cost is low. ACCOUT OF DRAWINGS

[0022] Figure 1 It is the explosion map of the cylindrical battery cover plate provided in the utility model embodiment;

[0023] Figure 2 It is Figure 1 The local enlarged view of A in it;

[0024] Figure 3 It is Figure 1 The local enlarged view of B in it;

[0025] Figure 4 It is the structure schematic diagram of first plastic piece provided in the utility model embodiment;

[0026] Figure 5 It is Figure 4 The local enlarged view of C in it;

[0027] Figure 6 It is the sectional view of cylindrical battery cover plate provided in the utility model embodiment;

[0028] Figure 7 It is Figure 6 The local enlarged view of D in it.

[0029] In the drawing:

[0030] 100, top cover sheet; 101, first mounting hole; 110, annular limiting groove; 111, first limiting surface; 112, first transition surface; 200, first plastic part; 201, second mounting hole; 210, second limiting surface; 220, second transition surface; 230, accommodating groove; 231, protrusion; 300, pole column; 310, plate body part; 320, column body part; 330, fixing rim; 400, second plastic part; 401, third mounting hole; 410, limiting flange; 500, sealing part; 600, supporting part. DETAILED DESCRIPTION

[0031] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0032] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0035] As Figures 1-3As shown, the embodiment provides a cylindrical battery cover plate, which comprises a top cover sheet 100 and a first plastic part 200, wherein the first plastic part 200 is arranged on one side of the top cover sheet 100, the top cover sheet 100 is provided with an annular limiting groove 110 on the end face of the side facing the first plastic part 200, the first plastic part 200 is annular, and at least part of the first plastic part 200 is embedded in the annular limiting groove 110. Through the cooperation of the annular limiting groove 110 and the first plastic part 200, the positioning between the first plastic part 200 and the top cover sheet 100 is accurate, which is beneficial to improve the assembly precision of the cylindrical battery cover plate.

[0036] Further, the groove bottom of the annular limiting groove 110 comprises a plurality of first limiting surfaces 111 with slopes. The plurality of first limiting surfaces 111 are sequentially connected in a head-to-tail manner, that is, the tail end of a previous first limiting surface 111 is connected with the head end of a next first limiting surface 111, the head end and the tail end of each first limiting surface 111 are located in different planes, so that there is a height difference between the adjacent two first limiting surfaces 111, and a first transition surface 112 is formed between the adjacent two first limiting surfaces 111, that is, the tail end of a previous first limiting surface 111 and the head end of a next first limiting surface 111 are connected through a first transition surface 112.

[0037] Continuing to refer to Figure 1 , Figure 4 and Figure 5 , the end face of the first plastic part 200 on the side facing the top cover sheet 100 comprises a plurality of second limiting surfaces 210 with slopes, the plurality of second limiting surfaces 210 are sequentially connected in a head-to-tail manner, that is, the tail end of a previous second limiting surface 210 is connected with the head end of a next second limiting surface 210, the head end and the tail end of each second limiting surface 210 are located in different planes, so that there is a height difference between the adjacent two second limiting surfaces 210, and a second transition surface 220 is formed between the adjacent two second limiting surfaces 210, that is, the tail end of a previous second limiting surface 210 and the head end of a next second limiting surface 210 are connected through a second transition surface 220. The first limiting surface 111 and the second limiting surface 210 are closely fitted, and the first transition surface 112 and the second transition surface 220 are closely fitted.

[0038] As an optional local solution, each first limiting surface 111 in the annular limiting groove 110 comprises a head end and a tail end. In the direction from the head end of the first limiting surface 111 to the tail end of the first limiting surface 111, the distance between the first limiting surface 111 and the end surface of the top cover sheet 100 away from the first plastic part 200 gradually increases. Taking the direction from the head end of the first limiting surface 111 to the tail end of the first limiting surface 111 as the clockwise direction as an example, the head end of the first limiting surface 111 is the lowest point of the groove bottom of the annular limiting groove 110, and the tail end of the first limiting surface 111 is the highest point of the groove bottom of the annular limiting groove 110. In the two adjacent first limiting surfaces 111, the tail end of the former first limiting surface 111 is higher than the head end of the latter first limiting surface 111, that is, a height difference is formed between the tail end of the former first limiting surface 111 and the head end of the latter first limiting surface 111, and the height difference is transitioned by the first transition surface 112.

[0039] After the cylindrical battery cover plate is assembled, the first limiting surface 111 and the second limiting surface 210 can be tightly fitted, and the first transition surface 112 and the second transition surface 220 can be tightly fitted. When the first plastic part 200 is subjected to a force of counterclockwise rotation relative to the top cover sheet 100, the first transition surface 112 can abut against the second transition surface 220, thereby preventing the first plastic part 200 from counterclockwise rotating relative to the top cover sheet 100. In addition, since the first plastic part 200 is pressed on the top cover sheet 100, when the first plastic part 200 is subjected to a force of clockwise rotation relative to the top cover sheet 100, the first limiting surface 111 and the second limiting surface 210 can abut, thereby preventing the first plastic part 200 from clockwise rotating relative to the top cover sheet 100.

[0040] Therefore, the positioning between the first plastic part 200 and the top cover sheet 100 is good, and the first plastic part 200 will not rotate relative to the top cover sheet 100, which is beneficial to ensure the safety of the cylindrical battery cover plate and is not prone to short circuit risk. In addition, the structure of the above cylindrical battery cover plate is simple, easy to process, low in cost, and low in assembly difficulty, which is beneficial to improve the electrical performance of the cylindrical battery cover plate and improve the reliability of the cylindrical battery.

[0041] Further, the first limiting surface 111 in the embodiment is provided with four first limiting surfaces 111, the shapes of the four first limiting surfaces 111 are the same, and the inner side edge of each first limiting surface 111 subtends a central angle of 90°. The second limiting surface 210 is also provided with four second limiting surfaces 210, the second limiting surface 210 corresponds to the first limiting surface 111 one by one, the shapes of the four second limiting surfaces 210 are the same, and the inner side edge of each second limiting surface 210 subtends a central angle of 90°. Of course, in other embodiments, other numbers of first limiting surfaces 111 and second limiting surfaces 210 can be arranged as needed. For example, the first limiting surface 111 and the second limiting surface 210 can be provided with two, three, five, six, etc., which will not be listed one by one here.

[0042] Exemplarily, the top cover sheet 100 in the embodiment can be made of aluminum material, the annular limiting groove 110 on the top cover sheet 100 and the plurality of first limiting surfaces 111 on the groove bottom of the annular limiting groove 110 can be formed by stamping. The first plastic part 200 is made of insulating material, for example, PPS material (polyphenylene sulfide). The plurality of second limiting surfaces 210 can be integrally formed with the first plastic part 200 by injection molding.

[0043] Continuing to refer to Figure 1 , Figure 6 and Figure 7 , the cylindrical battery cover plate in the embodiment includes a pole 300 and a second plastic part 400, the second plastic part 400 is located on the side of the top cover sheet 100 away from the first plastic part 200, the pole 300 includes a plate body part 310, a column part 320 and a fixing rim 330 connected with each other, the plate body part 310 is located on the side of the first plastic part 200 away from the top cover sheet 100, the column part 320 is arranged through the first plastic part 200, the top cover sheet 100 and the second plastic part 400, and the fixing rim 330 presses the second plastic part 400 against the top cover sheet 100. The first plastic part 200 and the second plastic part 400 are fixed on the top cover sheet 100 by the plate body part 310 and the fixing rim 330. The second plastic part 400 is also made of insulating material, for example, the second plastic part 400 is also made of PPS material (polyphenylene sulfide). The end surface of the top cover sheet 100 on the side away from the second plastic part 400 is insulated from the plate body part 310 of the pole 300 by the first plastic part 200, and the end surface of the top cover sheet 100 on the side away from the first plastic part 200 is insulated from the fixing rim 330 of the pole 300 by the second plastic part 400. It should be noted that, before the pole 300 is assembled with the first plastic part 200, the top cover sheet 100 and the second plastic part 400, the fixing rim 330 and the column part 320 both extend along the Z-axis direction in Figure 6 , after the pole 300 is assembled with the first plastic part 200, the top cover sheet 100 and the second plastic part 400, the fixing rim 330 is bent by riveting processing, so as to press the second plastic part 400 against the top cover sheet 100, thereby achieving the fixed installation of the pole 300, the first plastic part 200, the top cover sheet 100 and the second plastic part 400.

[0044] Optionally, the top cover sheet 100 is provided with a first mounting hole 101, the first plastic part 200 is provided with a second mounting hole 201, the second plastic part 400 is provided with a third mounting hole 401, the columnar portion 320 is sequentially arranged in the second mounting hole 201, the first mounting hole 101 and the third mounting hole 401, the second plastic part 400 is provided with a limiting flange 410, the limiting flange 410 is located in the circumferential direction of the third mounting hole 401, and the limiting flange 410 extends towards the direction of the top cover sheet 100 and extends into the first mounting hole 101. Through the cooperation of the limiting flange 410 and the inner wall of the first mounting hole 101, the positioning between the second plastic part 400 and the top cover sheet 100 is accurate, which is beneficial to improve the assembly precision of the cylindrical battery cover plate and improve the reliability of the cylindrical battery cover plate. At the same time, when the second plastic part 400 and the top cover sheet 100 are assembled, the limiting flange 410 can also play a certain guiding role, which is convenient for assembly and has a high assembly yield.

[0045] Further, the cylindrical battery cover plate further comprises a sealing member 500, the sealing member 500 is annular, and the sealing member 500 is sleeved on the columnar portion 320 of the pole column 300. Along the axial direction of the columnar portion 320 (i.e. the Z-axis direction in Figure 6 , the sealing member 500 is clamped between the fixed rim 330 and the second plastic part 400. The gap between the pole column 300 and the second plastic part 400 is sealed by the sealing member 500, so as to ensure that the sealing performance of the cylindrical battery cover plate is good, and the problems of gas leakage or electrolyte leakage are avoided. Exemplarily, the sealing member 500 can be made of materials such as rubber and silicone which have elastic deformation capability, on the one hand, the sealing performance between the pole column 300 and the second plastic part 400 is good, and on the other hand, the insulation between the pole column 300 and the second plastic part 400 is also ensured.

[0046] Continuing to refer to Figure 5 and Figure 7 , the side of the first plastic part 200 away from the top cover sheet 100 is provided with a receiving groove 230, and at least part of the plate body portion 310 of the pole column 300 is located in the receiving groove 230. Through the cooperation of the receiving groove 230 and the plate body portion 310, the positioning between the pole column 300 and the first plastic part 200 is accurate, which is beneficial to improve the assembly precision of the cylindrical battery cover plate and the assembly yield. At the same time, the height of the cylindrical battery cover plate along the Z-axis direction in Figure 6 can be reduced, the occupied space of the cylindrical battery cover plate is reduced, which is beneficial to realize the miniaturization of the cylindrical battery, and the energy density of the cylindrical battery is higher.

[0047] Further, in some embodiments, the groove wall of the accommodating groove 230 is provided with a plurality of protrusions 231, which are arranged along the circumference of the first plastic part 200 and abut against the circumferential side wall of the plate body 310. By interference fit between the protrusions 231 and the plate body 310, the fixation between the pole post 300 and the first plastic part 200 is more stable and firm, avoiding relative rotation between the pole post 300 and the first plastic part 200. It should be noted that at the position where the accommodating groove 230 is not provided with the protrusions 231, the groove wall of the accommodating groove 230 and the circumferential side wall of the plate body 310 are in a small gap fit, thereby facilitating the assembly of the pole post 300 and the first plastic part 200. Otherwise, if the groove wall of the accommodating groove 230 and the circumferential side wall of the plate body 310 are in interference fit, the pole post 300 and the first plastic part 200 are difficult to assemble, and even if the pole post 300 and the first plastic part 200 are successfully assembled, it may cause the first plastic part 200 to deform or crack, which has certain safety risks. Therefore, the groove wall of the accommodating groove 230 and the circumferential side wall of the plate body 310 are in a small gap fit, which is a more optimal solution.

[0048] The cylindrical battery cover plate further comprises a support 600, which is also annular. The support 600 is sleeved on the cylindrical body 320 and is clamped between the top cover sheet 100 and the first plastic part 200 along the axial direction of the cylindrical body 320. When the fixed rim 330 of the pole post 300 is riveted to the second plastic part 400, the plate body 310 of the pole post 300 can be supported by the support 600, avoiding a large acting force between the plate body 310 and the first plastic part 200, which may cause the first plastic part 200 to crack or deform, thereby improving the reliability and safety of the cylindrical battery cover plate. Optionally, the support ring can be made of the same material as the sealing member 500. When the support 600 is compressed, it can also seal the gap between the first plastic part 200 and the pole post 300, improving the sealing performance of the cylindrical battery cover plate, while ensuring the insulation of the plate body 310 of the pole post 300 and the top cover sheet 100.

[0049] The present embodiment also provides a cylindrical battery, which comprises a shell, a pole group, and the above-mentioned cylindrical battery cover plate. The shell is provided with an opening on one side, and the pole group is loaded into the shell through the opening. The positive electrode tab of the pole group is electrically connected to the pole post 300 on the top cover sheet 100, and the negative electrode tab of the pole group is electrically connected to the shell. The edge of the top cover sheet 100 on the side provided with the opening is welded to the shell, so that the pole group is packaged in a sealed space by the shell and the cylindrical battery cover plate.

[0050] By using the above-mentioned cylindrical battery cover plate, the first plastic part 200 can be prevented from rotating relative to the top cover sheet 100 while ensuring its electrical conductivity, thereby strengthening the safety design of the cylindrical battery, meeting the safety requirements of the battery, having a long service life, high reliability, low assembly difficulty, and low raw material cost.

[0051] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A cylindrical battery cover, characterized in that, include: A top cover plate (100) is provided with an annular limiting groove (110). The bottom of the annular limiting groove (110) includes multiple first limiting surfaces (111) with slopes. The multiple first limiting surfaces (111) are connected end to end in sequence, and a first transition surface (112) is formed between two adjacent first limiting surfaces (111). The first plastic part (200) has a plurality of sloped second limiting surfaces (210) on the end face facing the top cover sheet (100). The plurality of second limiting surfaces (210) are connected end to end in sequence, and a second transition surface (220) is formed between two adjacent second limiting surfaces (210). The first limiting surface (111) is in contact with the second limiting surface (210), and the first transition surface (112) is in contact with the second transition surface (220).

2. The cylindrical battery cover plate according to claim 1, characterized in that, The first limiting surface (111) includes a head end and a tail end. Along the direction from the head end of the first limiting surface (111) to the tail end of the first limiting surface (111), the distance between the first limiting surface (111) and the end face of the top cover plate (100) on the side away from the first plastic part (200) gradually increases.

3. The cylindrical battery cover plate according to claim 1, characterized in that, There are four first limiting surfaces (111), and the four first limiting surfaces (111) have the same shape. The central angle opposite to the inner edge of each first limiting surface (111) is 90°. There are four second limiting surfaces (210), and each second limiting surface (210) corresponds to one of the first limiting surfaces (111). The four second limiting surfaces (210) have the same shape, and the central angle opposite the inner edge of each second limiting surface (210) is 90°.

4. The cylindrical battery cover plate according to claim 1, characterized in that, The cylindrical battery cover includes a terminal post (300) and a second plastic part (400). The second plastic part (400) is located on the side of the top cover plate (100) away from the first plastic part (200). The terminal post (300) includes a plate portion (310), a column portion (320), and a fixing edge (330) that are connected to each other. The plate portion (310) is located on the side of the first plastic part (200) away from the top cover plate (100). The column portion (320) passes through the first plastic part (200), the top cover plate (100), and the second plastic part (400). The fixing edge (330) presses the second plastic part (400) against the top cover plate (100).

5. The cylindrical battery cover plate according to claim 4, characterized in that, The cylindrical battery cover includes a sealing element (500), which is sleeved on the cylindrical portion (320) and sandwiched between the fixing edge (330) and the second plastic part (400) along the axial direction of the cylindrical portion (320).

6. The cylindrical battery cover plate according to claim 5, characterized in that, The top cover plate (100) is provided with a first mounting hole (101), the first plastic part (200) is provided with a second mounting hole (201), and the second plastic part (400) is provided with a third mounting hole (401). The column part (320) is sequentially inserted through the second mounting hole (201), the first mounting hole (101), and the third mounting hole (401). The second plastic part (400) is provided with a limiting flange (410). The limiting flange (410) is located in the circumferential direction of the third mounting hole (401). The limiting flange (410) extends toward the top cover plate (100) and extends into the first mounting hole (101).

7. The cylindrical battery cover plate according to claim 4, characterized in that, The first plastic part (200) has a receiving groove (230) on the side opposite to the top cover plate (100), and at least a portion of the plate body part (310) is located in the receiving groove (230).

8. The cylindrical battery cover plate according to claim 7, characterized in that, The receiving groove (230) has a plurality of protrusions (231) on its groove wall. The plurality of protrusions (231) are arranged at intervals along the circumference of the first plastic part (200). The protrusions (231) abut against the peripheral sidewall of the plate part (310).

9. The cylindrical battery cover plate according to claim 4, characterized in that, The cylindrical battery cover also includes a support member (600), which is sleeved on the cylindrical part (320) and sandwiched between the top cover plate (100) and the first plastic part (200) along the axial direction of the cylindrical part (320).

10. A cylindrical battery, characterized in that, Includes the cylindrical battery cover plate according to any one of claims 1-9.

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