Cover plate for cylindrical battery and cylindrical battery

Abstract

The invention relates to the technical field of batteries, particularly provides a cover plate for a cylindrical battery and the cylindrical battery, and aims to solve the problem of insufficient supporting force of a cover plate of an existing cylindrical battery on a roll core. In order to achieve the purpose, the cover plate of the cylindrical battery comprises a cover body and a supporting piece arranged on the cover body to support a roll core of the cylindrical battery, and the supporting piece is arranged on the side, facing the roll core, of the cover body. According to the cover plate, the supporting piece is arranged on the inner surface of the cover body to support the roll core, so that the supporting force of the cover plate on the roll core can be improved, the roll core is prevented from collapsing and deforming, and the safety of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and specifically provides a cover plate for a cylindrical battery and a cylindrical battery. Background Art

[0002] As the energy crisis and environmental pollution problems become increasingly serious worldwide, people's requirements for energy conservation and emission reduction in automobiles are gradually increasing. New energy vehicles have attracted more and more attention due to their low noise, pollution-free and high energy efficiency, thus promoting the accelerated development of new energy vehicles. At present, new energy vehicles usually use batteries as a power source, which provides a broad space for the application and development of batteries.

[0003] Cylindrical batteries are attracting more and more attention. Cylindrical batteries mainly include shell, cover, winding core, negative current collector and positive current collector. The bottom end of the shell is open, the cover is set at the bottom of the shell to close the bottom opening, and the winding core, negative current collector and positive current collector are all installed in the shell.

[0004] The winding core is generally formed by winding the positive electrode sheet, the negative electrode sheet and the diaphragm, a positive electrode ear is arranged at the top of the winding core, and the positive electrode ear is electrically connected to the positive electrode sheet, a negative electrode ear is arranged at the bottom of the winding core, and the negative electrode ear is electrically connected to the negative electrode sheet, the positive current collecting disk is located directly above the winding core, the positive current collecting disk is fixedly connected to the shell, the positive electrode ear of the winding core is electrically connected to the positive current collecting disk, and the positive electrode ear and the positive current collecting disk are generally fixedly connected by welding, the negative electrode current collecting disk is located directly below the winding core, the negative current collecting disk is also fixedly connected to the shell, the negative electrode ear of the winding core is electrically connected to the negative current collecting disk, and the negative electrode ear and the negative current collecting disk are generally fixedly connected by welding, in order to avoid short circuit, an insulating structure is arranged between the positive current collecting disk or the negative current collecting disk and the shell.

[0005] The cover is located directly below the negative collector plate and is supported by the bottom of the negative collector plate. Due to the weak strength of the negative collector plate, the weight of the winding core falls entirely on the cover, and the winding core is actually supported by the cover. However, the existing battery cover does not provide sufficient support for the winding core, causing the winding core to sag and deform, resulting in misalignment of the pole piece, and in severe cases, causing a short circuit inside the battery.

[0006] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0007] The present invention aims to solve the above technical problem, that is, to solve the problem that the cover plate of the existing cylindrical battery has insufficient support force on the winding core.

[0008] In a first aspect, the present invention provides a cover plate for a cylindrical battery, the cover plate comprising a cover body and a support member disposed on the cover body to support a winding core of the cylindrical battery, wherein the support member is disposed on a side of the cover body facing the winding core.

[0009] In a preferred technical solution of the above cover plate, the cover body includes a first body and a second body, in the axial direction, the first body is arranged close to the winding core and the second body is arranged away from the winding core, and the support member is arranged on the first body.

[0010] In a preferred technical solution of the above cover plate, the second body is provided with an explosion-proof structure on a side facing the support member; and / or the second body is provided with an explosion-proof structure on a side away from the support member.

[0011] In a preferred technical solution of the above cover plate, the cover body further comprises a boss located inside the second body in the circumferential direction and arranged toward a side close to the winding core, and a liquid injection hole is arranged on the boss.

[0012] In a preferred technical solution of the above cover plate, on a side away from the winding core, the cover body is provided with a groove at a position corresponding to the boss.

[0013] In a preferred technical solution of the above cover plate, the support member is provided with a through hole at a position corresponding to the injection hole, and the through hole penetrates the support member along the thickness direction of the support member.

[0014] In a preferred technical solution of the above cover plate, the diameter of the through hole is larger than the diameter of the injection hole.

[0015] In the preferred technical solution of the above-mentioned cover plate, the support member includes a base and support ribs, the number of the support ribs is multiple and they are distributed at intervals along the circumference of the base, one end of the support rib is fixedly connected to the base or integrally arranged, and the other end of the support rib is fixedly connected to the first body.

[0016] In a preferred technical solution of the above cover plate, the support member is fixed to the cover body by riveting.

[0017] In a second aspect, the present invention provides a cylindrical battery, which includes the above-mentioned cover plate.

[0018] When the above technical solution is adopted, the cover plate of the present invention supports the winding core by arranging a support member on the inner surface of the cover body, which can improve the support force of the cover plate on the winding core, prevent the winding core from sagging and deformation, and improve the safety of the battery.

[0019] Furthermore, the cover plate of the present invention arranges the explosion-proof structure on the second body, so that the explosion-proof structure can be prevented from being squeezed by the support member and opened prematurely, thereby improving the stability of the battery.

[0020] Furthermore, the cover plate of the present invention is provided with a groove on the side of the cover body away from the winding core, and the groove is used to accommodate a sealing pin for sealing the injection hole, thereby improving the connection stability between the sealing pin and the cover plate and improving the sealing of the injection hole.

[0021] Furthermore, the cover plate of the present invention is advantageous for improving the liquid injection efficiency and the overall wetting performance by arranging through holes on the support member.

[0022] Furthermore, the cover plate of the present invention helps to improve the injection efficiency by making the diameter of the through hole larger than the diameter of the injection hole, thereby improving the production efficiency of the battery.

[0023] Furthermore, the cover plate of the present invention can reduce the weight and production cost of the cover plate while ensuring sufficient supporting force by configuring the support member to be a structure of a base body plus a plurality of supporting ribs.

[0024] Furthermore, the cover plate of the present invention fixes the support member and the cover body by riveting, which can save welding steps and further reduce production costs.

[0025] In addition, the cylindrical battery further provided by the present invention on the basis of the above technical solution includes the above cover plate, and thus has the technical effects possessed by the above cover plate. Compared with the cylindrical battery before the improvement, the cylindrical battery of the present invention has sufficient supporting force for the winding core, which can avoid the situation of the winding core sagging and deformation, and is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a partial cross-sectional view of a cylindrical battery of the present invention;

[0028] Figure 2 is a three-dimensional schematic diagram of a cover plate of a cylindrical battery of the present invention;

[0029] Figure 3 is a schematic top view of a cover plate of a cylindrical battery of the present invention;

[0030] Figure 4 Schematic diagram of the cross section of the cover plate of the cylindrical battery of the present invention.

[0031] List of reference numerals:

[0032] 1. Shell;

[0033] 2. Cover plate; 21. Cover body; 22. Support member;

[0034] 211, first body; 212, second body; 213, injection hole; 214, boss; 215, groove; 216, explosion-proof notch; 221, base; 222, support rib; 2211, through hole; 2221, riveting point;

[0035] 3. Roll core;

[0036] 4. Negative electrode current collector. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0038] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "top", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "setting", "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Specifically, first refer to Figure 1 , Figure 1 It is a partial cross-sectional view of a cylindrical battery of the present invention.

[0041] The present invention provides a cylindrical battery, such as Figure 1 As shown, the cylindrical battery of the present invention comprises a housing 1, a cover plate 2 and a winding core 3. The housing 1 has an opening at the bottom, the cover plate 2 is used to close the opening, and the winding core 3 is installed in the housing 1.

[0042] For example, Figure 1 As shown, the cover plate 2 is welded and fixed to the shell 1 , and the cover plate 2 is located below the winding core 3 and can support the winding core 3 .

[0043] As can be seen from the background technology, the cover plate of the existing cylindrical battery has insufficient support force on the winding core 3, which causes the winding core 3 to sag and deform, and then causes the pole piece to be misaligned, and in severe cases, causes a short circuit inside the battery. Based on this, the present invention provides a new cover plate 2, which is intended to improve the support force of the cover plate 2 on the winding core 3.

[0044] Continue reading Figure 1 , and then see Figures 2 to 4 ,in, Figure 2 is a three-dimensional schematic diagram of a cover plate of a cylindrical battery of the present invention; Figure 3 is a schematic top view of a cover plate of a cylindrical battery of the present invention; Figure 4 Schematic diagram of the cross section of the cover plate of the cylindrical battery of the present invention.

[0045] like Figures 1 to 4 As shown, the cover plate 2 of the present invention includes a cover body 21 and a support member 22 arranged on the inner surface of the cover body 21. The support member 22 is used to directly or indirectly support the winding core 3 of the battery. The inner surface of the cover body 21 is a side of the cover body 21 close to the winding core 3. Figure 1 The upper surface of the cover body 21 is shown as above.

[0046] The cover plate 2 of the present invention supports the battery winding core 3 by providing a support member 22 on the inner surface of the cover body 21, thereby improving the support force of the cover plate 2 on the winding core 3 and preventing the winding core 3 from sagging and deforming, thereby improving the safety of the battery.

[0047] It should be noted that, in practical applications, those skilled in the art can enable the support member 22 to indirectly support the battery winding core 3, such as Figure 1 As shown, a negative electrode collector disk 4 is arranged between the winding core 3 and the cover plate 2, a negative electrode ear is arranged at the bottom end of the winding core 3, the negative electrode ear is welded to the negative electrode collector disk 4, the negative electrode collector disk 4 is directly supported below the winding core 3, the cover plate 2 is located below the negative electrode collector disk 4, and the support member 22 arranged on the cover plate 2 is supported on the bottom of the negative electrode collector disk 4, that is, indirect support is formed for the winding core 3 of the battery, or, the support member 22 can also directly support the winding core 3 of the battery. Specifically, the negative electrode collector disk 4 arranged between the cover plate 2 and the winding core 3 can be eliminated, that is, the cover plate 2 is directly arranged below the winding core 3, so that the support member 22 arranged on the cover plate 2 is directly supported on the bottom of the winding core 3. Such flexible adjustment and change do not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0048] In addition, it should be noted that, in the case where the negative electrode current collecting plate 4 is not provided, the negative electrode ear of the winding core 3 can be directly electrically connected to the cover plate 2 .

[0049] In addition, it should be noted that the present invention does not limit the specific structural form of the support member 22. For example, a person skilled in the art may configure the support member 22 as a strip support plate, or may configure the support member 22 as a support frame, or may configure the support member 22 as a support block, etc. Such adjustments and changes to the specific structural form of the support member 22 do not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0050] In addition, it should be noted that the present invention does not limit the specific connection form between the support member 22 and the cover body 21. For example, a person skilled in the art may set the support member 22 and the cover body 21 as one piece in actual application, or may fix the support member 22 and the cover body 21 together, for example, by welding or riveting the support member 22 and the cover body 21 together, etc. Such adjustment and change to the specific connection form between the support member 22 and the cover body 21 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0051] Preferably, in the present invention, the support member 22 is fixed to the cover body 21 by riveting.

[0052] The cover plate 2 of the present invention fixes the support member 22 and the cover body 21 by riveting, which can save welding steps and further reduce production costs.

[0053] Exemplarily, a riveting groove is provided on the cover body 21 , a riveting protrusion is provided on the support member 22 , and the riveting protrusion is inserted into the riveting groove to rivet and fix the support member 22 to the cover body 21 .

[0054] Preferably, if Figures 1 to 4 As shown, the cover body 21 of the cover plate 2 of the present invention includes a first body 211 and a second body 212 . In the axial direction, the first body 211 is arranged close to the winding core 3 and the second body 212 is arranged away from the winding core 3 . The support member 22 is arranged on the first body 211 .

[0055] For example, Figure 4 As shown, the top surface of the cover body 21 is its inner surface (the side of the cover body 21 close to the winding core 3), the bottom surface of the cover body 21 is its outer surface (the side of the cover body 21 away from the winding core 3), the middle area of ​​the cover body 21 is recessed downward, the recessed area is defined as the second body 212, and the annular area located outside the recessed area is defined as the first body 211, that is, the first body 211 is annular and extends along the circumference of the cover body 21, the second body 212 is located on the inner side of the first body 211, the support member 22 is arranged on the first body 211, and the second body 212 is recessed toward the outer surface of the cover body 21 to avoid contact with the support member 22, that is, there is a gap between the bottom surface of the support member 22 and the second body 212.

[0056] It should be noted that, in actual applications, those skilled in the art can flexibly set the specific value of the gap between the support member 22 and the second body 212 according to specific circumstances. For example, the gap can be set to 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm or 2.5mm, etc. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and should be limited within the scope of protection of the present invention.

[0057] Of course, it is preferred that the gap between the support member 22 and the second body 212 is set to be no greater than 2.0 mm to avoid excessive occupation of the vertical space of the battery.

[0058] Preferably, if Figure 4 As shown, the second body 212 of the cover plate 2 of the present invention is provided with an explosion-proof structure on a side away from the support member 22 .

[0059] The present invention arranges the explosion-proof structure on the second body 212 , so as to avoid the situation where the explosion-proof structure is squeezed by the support member 22 and opened prematurely, thereby improving the stability of the battery.

[0060] For example, Figure 4 As shown, the cover plate 2 of the present invention has an outer surface (from Figure 4 A circle of explosion-proof notches 216 (i.e., explosion-proof structure) is provided on the bottom surface of the second body 212 (seeing from above), and the support member 22 is located just above the explosion-proof structure. The winding core 3 is supported by the support member 22. When the winding core 3 is pressed down, the support member 22 is first contacted, and the explosion-proof structure below the support member 22 will not be squeezed, thereby avoiding the situation where the explosion-proof structure is opened prematurely.

[0061] It should be noted that, in actual applications, those skilled in the art may also set an explosion-proof structure on the side of the second body 212 facing the support member 22 , or set an explosion-proof structure on both the side of the second body 212 facing the support member 22 and the side away from the support member 22 .

[0062] Preferably, if Figures 2 to 4 As shown, the support member 22 of the present invention includes a base 221 and support ribs 222. The number of the support ribs 222 is multiple, and the multiple support ribs 222 are distributed at intervals along the circumference of the base 221. One end of the support rib 222 is fixedly connected to the base 221 or integrally arranged, and the other end of the support rib 222 is fixedly connected to the first body 211.

[0063] The cover plate 2 of the present invention can reduce the weight and production cost of the cover plate 2 while ensuring sufficient supporting force by configuring the support member 22 to be a structure of a base 221 plus a plurality of support ribs 222 .

[0064] For example, Figure 3 As shown, the base 221 of the support member 22 of the present invention is a circular plate, and the number of the support ribs 222 is four, and the four support ribs 222 are evenly distributed along the circumference of the base 221, and the angle between two adjacent support ribs 222 is exactly 90 degrees, wherein the inner end of each support rib 222 is integrally arranged with the base 221, and the outer end of each support rib 222 is provided with a rivet point 2221, and the outer end of the support rib 222 is fixedly connected to the first body 211 of the cover body 21 by riveting.

[0065] It should be noted that the shape of the substrate 221 is not limited to a circular plate. For example, those skilled in the art may also set the shape of the substrate 221 to a square, etc. in actual applications. Such adjustments and changes to the specific shape of the substrate 221 do not deviate from the principle and scope of the present invention and should be limited within the scope of protection of the present invention.

[0066] Of course, in the present invention, it is preferred that the base 221 is configured as a circular plate.

[0067] In addition, it should be noted that the number of support ribs 222 is not limited to the above-mentioned four. For example, those skilled in the art may also set the number of support ribs 222 to two, three or five, etc. in actual applications. Such adjustments and changes to the specific number of support ribs 222 do not deviate from the principle and scope of the present invention and should be limited within the scope of protection of the present invention.

[0068] Of course, the present invention preferably sets the number of the supporting ribs 222 to three or four.

[0069] Preferably, if Figures 2 to 4 As shown, the cover body 21 further includes a boss 214 located on the inner side of the second body 212 in the circumferential direction and arranged toward the side close to the winding core 3 , and a liquid injection hole 213 is arranged on the boss 214 .

[0070] Electrolyte can be injected into the battery housing 1 through the injection hole 213 .

[0071] For example, Figures 2 to 4As shown, the boss 214 is located on the inner surface of the second body 212 and protrudes toward the support member 22. The boss 214 is configured as a circular boss. The boss 214 is located in the middle position of the second body 212. The boss 214 protrudes upward in the vertical direction. The top surface of the boss 214 does not contact the support member 22. There is a gap between the boss 214 and the bottom surface of the cover body 21 of the support member 22. The present invention does not limit the specific value of the gap, and those skilled in the art can flexibly set it in actual applications. The injection hole 213 is a circular hole and is exactly located at the center of the boss 214.

[0072] It should be noted that the shape of the boss 214 is not limited to the above-mentioned circular boss. For example, a person skilled in the art may also set the boss 214 as a square boss in actual application, or may also set the boss 214 as a triangular boss, and so on. Such adjustment and change to the specific shape of the boss 214 does not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention.

[0073] Of course, the present invention preferably configures the boss 214 as a circular boss.

[0074] In addition, it should be noted that the location of the boss 214 is not limited to being set in the middle area of ​​the second body 212. For example, a person skilled in the art may also set the boss 214 near the edge of the second body 212 in actual applications. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and should be limited within the scope of protection of the present invention.

[0075] Of course, the present invention preferably arranges the boss 214 in the middle area of ​​the second body 212. Such an arrangement is helpful to improve the injection efficiency and the wettability of the battery.

[0076] In addition, it should be noted that the shape of the injection hole 213 is not limited to a circular hole. For example, a person skilled in the art may also set the injection hole 213 to a square hole, or set the injection hole 213 to a polygonal hole, etc. Such adjustments and changes to the specific shape of the injection hole 213 do not deviate from the principle and scope of the present invention, and should be limited within the scope of protection of the present invention.

[0077] Of course, the present invention preferably sets the injection hole 213 as a circular hole for ease of processing.

[0078] Preferably, if Figure 4 As shown, on the side away from the winding core 3, the cover body 21 is provided with a groove 215 at a position corresponding to the boss 214. The groove 215 is used to accommodate a sealing pin for sealing the liquid injection hole 213.

[0079] The cover plate 2 of the present invention can improve the connection stability between the sealing nail and the cover plate 2 and improve the sealing performance of the injection hole 213 by providing a sealing nail groove 215 for accommodating the sealing injection hole 213 on the outer surface of the cover body 21 .

[0080] For example, Figure 4 As shown, the groove 215 is located on the outer surface of the cover body 21, and the groove 215 is recessed toward the inner surface of the cover body 21. The cover plate 2 of the present invention is recessed upward in the middle area of ​​the cover body 21. While the groove 215 is formed on the outer surface of the cover body 21, a boss 214 is also formed on the inner surface of the cover body 21. A circular injection hole 213 is formed in the middle position of the boss 214. After the battery core 3 is loaded into the battery shell 1, the electrolyte is injected into the battery shell 1 through the injection hole 213. After the electrolyte is injected, the sealing nail is installed in the groove 215. The size of the groove 215 matches the size of the sealing nail. Then the sealing nail is welded to the shell 1 to seal the injection hole 213. In other words, the groove 215 is a positioning groove.

[0081] Preferably, if Figures 2 to 4 As shown, the support member 22 of the present invention is provided with a through hole 2211 at a position corresponding to the injection hole 213 , and the through hole 2211 penetrates the support member 22 along the thickness direction of the support member 22 .

[0082] The cover plate 2 of the present invention is provided with through holes 2211 on the support member 22, which is beneficial to improving the liquid injection efficiency and the overall wetting performance.

[0083] For example, Figures 2 to 4 As shown, the boss 214 is located just below the base 221 of the support member 22, and a through hole 2211 is formed on the base 221. The through hole 2211 and the injection hole 213 are both circular holes and are concentrically arranged. After the battery core 3 is installed into the battery shell 1, the electrolyte is injected into the battery shell 1 through the injection hole 213. The electrolyte injected from the injection hole 213 flows through the through hole 2211 to the battery core 3. After the electrolyte is filled, the sealing nail is installed in the groove 215. The size of the groove 215 matches the size of the sealing nail, and then the sealing nail is welded to the shell 1 to seal the injection hole 213.

[0084] It should be noted that the shape of the through hole 2211 is not limited to a circular hole. For example, a person skilled in the art may also set the through hole 2211 to a square hole, or set the through hole 2211 to a polygonal hole, etc. Such adjustments and changes to the specific shape of the through hole 2211 do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention.

[0085] Of course, the present invention preferably sets the through hole 2211 as a circular hole for ease of processing.

[0086] In addition, it should be noted that, in actual applications, those skilled in the art may set the aperture of the through hole 2211 to be larger than the aperture of the injection hole 213, or, may set the aperture of the through hole 2211 to be smaller than the aperture of the injection hole 213, or, may set the aperture of the through hole 2211 to be equal to the aperture of the injection hole 213. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention.

[0087] Preferably, if Figures 2 to 4 As shown, the diameter of the through hole 2211 is larger than the diameter of the injection hole 213 .

[0088] By making the aperture of the through hole 2211 larger than the aperture of the liquid injection hole 213, it is helpful to improve the liquid injection efficiency, thereby improving the production efficiency of the battery.

[0089] For example, Figure 4 As shown, the aperture of the through hole 2211 is larger than the aperture of the injection hole 213, but the aperture of the through hole 2211 is smaller than the outer diameter of the boss 214. In order to prevent the boss 214 from contacting with the support member 22, there is a gap between the boss 214 and the bottom surface of the support member 22. The present invention does not limit the specific value of the gap, and those skilled in the art can flexibly set it in actual applications.

[0090] Of course, the diameter of the through hole 2211 on the support member 22 may be larger than the outer diameter of the boss 214. In this way, the boss 214 may avoid contact with the support member 22. Those skilled in the art may flexibly set the arrangement according to the specific situation.

[0091] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0092] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A cover plate for a cylindrical battery, characterized in that: The cover plate includes a cover body and a support member disposed on the cover body to support the winding core of the cylindrical battery, wherein the support member is disposed on a side of the cover body facing the winding core.

2. The cover plate according to claim 1, characterized in that: The cover body includes a first body and a second body. In the axial direction, the first body is arranged close to the winding core and the second body is arranged away from the winding core. The support member is arranged on the first body.

3. The cover plate according to claim 2, characterized in that: The second body is provided with an explosion-proof structure on a side facing the support member; and / or the second body is provided with an explosion-proof structure on a side facing away from the support member.

4. The cover plate according to claim 2, characterized in that: The cover body further includes a boss located inside the second body in the circumferential direction and arranged toward a side close to the winding core, and a liquid injection hole is arranged on the boss.

5. The cover plate according to claim 4, characterized in that: The cover body is provided with a groove at a position corresponding to the boss on a side away from the winding core.

6. The cover plate according to claim 5, characterized in that: The support member is provided with a through hole at a position corresponding to the injection hole, and the through hole penetrates the support member along the thickness direction of the support member.

7. The cover plate according to claim 6, characterized in that: The diameter of the through hole is larger than the diameter of the injection hole.

8. The cover plate according to claim 2, characterized in that: The support member includes a base and support ribs. The support ribs are multiple and spaced apart along the circumference of the base. One end of the support rib is fixedly connected to or integrally provided with the base, and the other end of the support rib is fixedly connected to the first body.

9. The cover plate according to any one of claims 1 to 8, characterized in that: The support member is fixed to the cover body by riveting.

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

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