Shell structure of cylindrical battery and cylindrical battery

Abstract

The shell structure of the cylindrical battery is provided with a center line extending in the axial direction and a radial direction and comprises a bottom plate and a side plate, the side, in the axial direction, of the bottom plate is provided with a plurality of installation parts, the installation parts are arranged around the center line, and the installation parts are arranged at intervals in the radial direction; the side plate is selectively connected to one mounting part, and the bottom plate and the side plate define a containing cavity. The shell structure disclosed by the invention can be suitable for manufacturing various cylindrical batteries with different diameters, and shell preparation molds with various sizes do not need to be designed and manufactured, so that the number of the molds is reduced, and the processing cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a cylindrical battery casing structure and a cylindrical battery. Background Technology

[0002] Cylindrical batteries are characterized by high capacity, long cycle life, and a wide operating temperature range. With advancements in cylindrical battery technology, the diameter and height of cylindrical batteries are continuously increasing.

[0003] In related technologies, the casing of cylindrical batteries is manufactured using molds. Different molds are required for processing cylindrical batteries of different specifications (diameters), resulting in high processing costs. Summary of the Invention

[0004] This application aims to provide a casing structure for a cylindrical battery, which can solve the problem that cylindrical battery casings are manufactured by molds, and different molds are required for processing cylindrical batteries of different specifications (diameters), resulting in high processing costs.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a casing structure for a cylindrical battery, having a centerline extending axially and a radial direction, including a bottom plate and a side plate. The bottom plate has a plurality of mounting portions on one side along the axial direction, the mounting portions being arranged around the centerline, and the plurality of mounting portions being arranged at intervals along the radial direction. The side plate is selectively connected to one of the mounting portions, and the bottom plate and the side plate enclose a receiving cavity.

[0006] Optionally, the mounting part is a slot provided in the base plate, and the side plate is inserted into the slot.

[0007] Optionally, multiple slots are arranged coaxially.

[0008] Optionally, the base plate includes a body and a plurality of protrusions. The protrusions are connected to one side of the body along the axial direction and are arranged around the center line. The plurality of protrusions are arranged at intervals along the radial direction, and each of the protrusions is provided with a slot.

[0009] Optionally, the body includes an interconnected middle portion and an edge portion, the edge portion being disposed around the middle portion, and the protrusion being connected to the edge portion; the middle portion protrudes toward the receiving cavity to form a protrusion, and the end face of the protrusion toward the receiving cavity is higher than the end face of the protrusion toward the receiving cavity.

[0010] Optionally, the body has a cut-off groove, which is disposed between two adjacent protrusions, and is recessed on the side of the body away from the receiving cavity, and is arranged around the center line.

[0011] Optionally, two adjacent protrusions include an inner protrusion and an outer protrusion arranged at a distance along the radial direction, wherein the distance between the cutting groove and the inner protrusion is less than the distance between the cutting groove and the outer protrusion along the radial direction.

[0012] Optionally, the cross-sectional area of ​​the cut-off groove gradually increases from the side of the body facing the receiving cavity to the side away from the receiving cavity.

[0013] Optionally, the body has a pressure relief groove, which is recessed in the middle portion on the side opposite to the receiving cavity.

[0014] Secondly, embodiments of this application propose a cylindrical battery, including the casing structure of the cylindrical battery of any of the above embodiments.

[0015] In this embodiment, the cylindrical battery casing structure includes a base plate and side plates. Multiple annular mounting portions are arranged radially at intervals along one side of the base plate along its axis, such that adjacent annular mounting portions have different diameters. A side plate can be selectively connected to one mounting portion. The side plate and the base plate together form a receiving cavity, thus forming the cylindrical battery casing. In practical use, a matching mounting portion on the base plate can be selected as the target mounting portion according to the diameter of the cylindrical battery to be manufactured. The side plate is then connected to the target mounting portion, and the portion of the base plate outside the target mounting portion (if any) is cut off to obtain the desired cylindrical casing. Thus, the casing structure of this application can be used to manufacture cylindrical batteries of various diameters without the need to design and manufacture casing preparation molds of multiple sizes, thereby reducing the number of molds and lowering processing costs.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below, wherein: Figure 1 This is a schematic diagram of the internal structure of the cylindrical battery casing according to an embodiment of this application; Figure 2 for Figure 1A magnified view of a section at point A in the middle; Figure 3 This is a cross-sectional view of the casing structure of the cylindrical battery according to an embodiment of this application; Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a perspective view of the base plate in an embodiment of this application.

[0018] Figure label: 10: Base plate; 11: Slot; 12: Body; 121: Middle part; 122: Edge part; 123: Protrusion; 13: Raised part; 131: Inner raised part; 132: Outer raised part; 14: Cut-off groove; 15: Pressure relief groove; 20: Side plate; 30: Receiving cavity; 31: Cavity opening; M: Centerline; X: Axial; Y: Radial. Detailed Implementation

[0019] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In related technologies, the casing of cylindrical batteries is manufactured by stamping and stretching processes. The side walls and bottom walls of the casing are integrally formed structures. The size of the casing after processing is fixed. If it is necessary to change the specifications of the cylindrical battery, it is necessary to re-mold and process it.

[0024] Because cylindrical batteries come in many specifications, different molds are required for each specification of cylindrical battery during the stamping and stretching process. This necessitates the production of multiple molds to manufacture various types of cylindrical batteries, resulting in high manufacturing costs for cylindrical batteries.

[0025] Based on this, embodiments of this application propose a cylindrical battery casing structure and a cylindrical battery to solve some or all of the above-mentioned technical problems.

[0026] The following description, in conjunction with the accompanying drawings, details the casing structure and cylindrical battery provided in this application through specific embodiments and application scenarios.

[0027] like Figures 1 to 5 As shown, the cylindrical battery casing structure according to some embodiments of this application has a center line M extending along the axial direction X and a radial direction Y, including a bottom plate 10 and a side plate 20. The bottom plate 10 has a plurality of mounting portions on one side along the axial direction X. The mounting portions are arranged around the center line M. The plurality of mounting portions are spaced apart along the radial direction Y. The side plate 20 can be selectively connected to one mounting portion. The bottom plate 10 and the side plate 20 form a receiving cavity 30.

[0028] In this embodiment, the cylindrical battery casing structure includes a base plate 10 and a side plate 20. Multiple annular mounting portions are provided on one side of the base plate 10 along its axis, spaced radially Y-shaped, such that adjacent annular mounting portions have different diameters. The side plate 20 can be selectively connected to one mounting portion. The side plate 20 and the base plate 10 together form a receiving cavity 30, thereby forming the cylindrical battery casing. In practical use, a matching mounting portion on the base plate 10 can be selected as the target mounting portion according to the diameter of the cylindrical battery to be manufactured. The side plate 20 is then connected to the target mounting portion, and the portion of the base plate 10 outside the target mounting portion (if any) is cut off to obtain the desired cylindrical casing. Thus, the casing structure of this application can be used to manufacture cylindrical batteries of various diameters without the need to design and manufacture casing preparation molds of multiple sizes, thereby reducing the number of molds and lowering processing costs.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the cylindrical battery casing structure has a centerline M extending along the axial direction X and a radial direction Y, where the axial direction X refers to the height direction of the cylindrical battery casing structure and the radial direction Y refers to the diameter direction of the cylindrical battery casing structure.

[0030] like Figure 2 and Figure 5 As shown, the base plate 10 is provided with multiple mounting parts, which form a ring around the center line M, thereby surrounding the center line M of the base plate 10. The multiple mounting parts are arranged at intervals along the radial Y, so that the distances of adjacent mounting parts from the center line M are different, that is, adjacent mounting parts have different diameters.

[0031] like Figure 2 As shown, the side plate 20 can be selectively connected to a mounting part according to the specifications of the cylindrical battery, thereby forming the casing of the cylindrical battery. The bottom plate 10 and the side plate 20 form a receiving cavity 30, which can be used to receive the cylindrical battery core and electrolyte, etc.

[0032] It should be noted that, Figures 1 to 4 Each mounting part in the figure is connected to a side plate 20. This is only to illustrate that each mounting part can be used to connect to the side plate 20. In actual application, only one of the multiple mounting parts on the base plate 10 is connected to the side plate 20. That is, the side plate 20 is selectively connected to a mounting part.

[0033] like Figure 1 and Figure 3 As shown, the cavity 30 has an opening 31 on the side away from the base plate 10, and the core of the cylindrical battery can be installed into the cavity 30 through the opening 31.

[0034] The side plate 20 can be connected to the base plate 10 by various methods such as welding, bonding and plugging. It can be flexibly set according to the actual situation, and this application embodiment does not limit it.

[0035] It should be noted that if there is still a base plate 10 on the outside of the mounting part connected to the side plate 20, the base plate 10 on the outside of the mounting part needs to be cut off to form a standard cylindrical structure, which is convenient for subsequent processing and installation. At the same time, the cut-off base plate 10 can also be recycled, and there will be no waste of materials.

[0036] For example, such as Figure 2 As shown, the base plate 10 has at least three mounting portions with diameters of 18mm, 21mm, and 26mm, respectively. When manufacturing a cylindrical battery with a diameter of 18mm and a height of 65mm, the side plate 20 with a height of 65mm is connected to the mounting portion with a diameter of 18mm, and then the base plate 10 outside the side plate 20 is cut off. When manufacturing a cylindrical battery with a diameter of 21mm and a height of 70mm, the side plate 20 with a height of 70mm is connected to the mounting portion with a diameter of 21mm, and then the base plate 10 outside the side plate 20 is cut off. When manufacturing a cylindrical battery with a diameter of 26mm and a height of 50mm, the side plate 20 with a height of 50mm is connected to the mounting portion with a diameter of 26mm, and then the base plate 10 outside the side plate 20 is cut off.

[0037] It should be noted that the height and diameter of the side plate 20 are determined according to the specifications of the cylindrical battery. The base plate 10 adapts to the side plates 20 of different specifications by providing multiple mounting parts at different positions, thereby realizing the manufacturing of the entire cylindrical battery casing through the connection between the base plate 10 and the side plate 20.

[0038] Understandably, in practical applications, the largest mounting part can be set at the edge of the base plate 10, that is, the diameter of the base plate 10 is the same as the diameter of the largest mounting part. In this way, when making the largest cylindrical battery, after the side plate 20 is connected to the corresponding mounting part, there is no longer a base plate 10 on the outside of the side plate 20, eliminating the need for cutting operations, reducing manufacturing steps, reducing the material used in making the base plate 10, and lowering costs.

[0039] Optionally, such as Figure 2 , Figure 4 and Figure 5 As shown, the mounting part is a slot 11 located on the base plate 10, and the side plate 20 is inserted into the slot 11.

[0040] In this embodiment, a mounting portion is formed by providing a slot 11 in the base plate 10, allowing the side plate 20 to be inserted into the slot 11. The slot 11 has a simple structure and is easy to manufacture. At the same time, the insertion method of the side plate 20 also facilitates the installation and positioning of the side plate 20.

[0041] Understandably, in order to improve the connection strength between the base plate 10 and the side plate 20, after the side plate 20 is inserted into the slot 11, the base plate 10 and the side plate 20 can also be firmly connected by welding, which also achieves the sealing of the base plate 10 and the side plate 20.

[0042] In some embodiments, the welding of the base plate 10 and the side plate 20 can be carried out by laser welding. Laser welding has the advantages of high energy density, small deformation, high welding speed and no subsequent processing, which can improve the welding efficiency and welding quality of the base plate 10 and the side plate 20.

[0043] Optionally, such as Figure 5 As shown, multiple slots 11 are coaxially arranged.

[0044] In this embodiment of the application, by setting multiple slots 11 coaxially, the central axis of each slot 11 is consistent, so that the casings of cylindrical batteries of different specifications have the same intermediate structure. For example, the casings all have the intermediate part 121 and the pressure relief groove 15 described later, which makes it convenient for cylindrical batteries of various specifications to achieve the same function, so that there is no need to design for each type of cylindrical battery separately, reducing the design difficulty.

[0045] Optionally, such as Figure 2 , Figure 4 and Figure 5 As shown, the base plate 10 includes a body 12 and a plurality of protrusions 13. The protrusions 13 are connected to one side of the body 12 along the axial direction X and are arranged around the center line M. The plurality of protrusions 13 are arranged at intervals along the radial direction Y, and each protrusion 13 is provided with a slot 11.

[0046] In this embodiment, multiple protrusions 13 are provided on the body 12, forming a structure for processing slots 11. The protrusions 13 are raised relative to the body 12, making the thickness of the protrusions 13 along the axial direction X greater. After processing to form the slots 11, the protrusions 13 can still maintain greater structural strength, thereby ensuring the structural strength of the base plate 10.

[0047] Specifically, such as Figure 4As shown, the thickness of the protrusion 13 along the axial direction X can be the same as the thickness of the body 12 along the axial direction X, for example, both being 1 mm thick. The body 12 is the main structure of the base plate 10, and the protrusion 13 is mainly provided for machining the slot 11. Therefore, in order to ensure the structural strength of the base plate 10, the depth of the slot 11 along the axial direction X should be less than or equal to the thickness of the protrusion 13 along the axial direction X. That is to say, the slot 11 will not extend into the body 12, ensuring the structural integrity and strength of the body 12, thereby ensuring the structural strength of the entire base plate 10.

[0048] Optionally, such as Figure 4 As shown, the body 12 includes a middle portion 121 and an edge portion 122 that are connected to each other. The edge portion 122 is disposed around the middle portion 121, and the protrusion 13 is connected to the edge portion 122. The middle portion 121 protrudes into the receiving cavity 30 to form a protrusion 123. The end face of the protrusion 123 facing the receiving cavity 30 is higher than the end face of the protrusion 13 facing the receiving cavity 30.

[0049] In this embodiment, by providing a protrusion 13 connected to the edge 122 of the body 12, the protrusion 13 can be positioned around the center line M of the middle portion 121. By ensuring that the end face of the protrusion 123 facing the receiving cavity 30 is higher than the end face of the protrusion 13 facing the receiving cavity 30, the end face of the protrusion 123 facing the receiving cavity 30 is further away from the body 12, i.e., closer to the opening 31 of the receiving cavity 30. Thus, after the core is installed into the receiving cavity 30, the end of the core abuts against the protrusion 123, preventing the end of the core from contacting the protrusion 13, thereby avoiding problems such as edge collisions and ensuring the integrity of the core.

[0050] Specifically, the protrusion 13 is machined to form a slot 11, which may result in defects such as burrs at the location of the protrusion 13. Additionally, the side plate 20 and the base plate 10 are connected by welding, which may result in defects such as weld slag at the connection point (i.e., the location of the protrusion 13). In this embodiment, a protrusion 123 is provided, which is closer to the opening 31 of the receiving cavity 30 than the protrusion 13. This ensures that after the core is installed, it abuts against the protrusion 123, preventing the edge of the core from contacting the protrusion 13, reducing the possibility of edge damage, and ensuring the integrity of the core.

[0051] In some embodiments, the height of the end face of the protrusion 123 facing the cavity 30 above the end face of the protrusion 13 facing the cavity 30 can be any value among 0.1mm, 0.2mm, 0.3mm, 0.4mm, and 0.5mm, or a range between any two values.

[0052] Optionally, such as Figure 2 and Figure 4 As shown, the body 12 has a cut-off groove 14, which is located between two adjacent protrusions 13. The cut-off groove 14 is recessed on the side of the body 12 away from the receiving cavity 30, and the cut-off groove 14 is arranged around the center line M.

[0053] In this embodiment, by providing a cutting groove 14 between two adjacent protrusions 13, after the side plate 20 is connected to the inner protrusion 13, it is convenient to cut between the two protrusions 13, facilitating the cutting of the bottom plate 10 and enabling the recycling of the cut bottom plate 10. By providing the cutting groove 14 recessed on the side of the body 12 away from the receiving cavity 30, i.e., the cutting groove 14 is located on the lower surface of the bottom plate 10, it is convenient to cut from the outside of the entire housing, reducing operational difficulty. By providing the cutting groove 14 around the center line M, it is convenient to cut the bottom plate 10 along the direction surrounding the center line M, forming a circular cut.

[0054] Specifically, the cut-off groove 14 forms a groove structure on the body 12, thereby reducing the thickness of the body 12 at the cut-off groove 14 and facilitating cut-off from the cut-off groove 14. At the same time, the cut-off groove 14 also provides a cut-off path, ensuring the consistency of the cut-off and improving the consistency of the shell after cut-off.

[0055] The cut-off groove 14 can be a rectangular groove, a semi-circular groove, a trapezoidal groove, or a triangular groove, etc., and can be flexibly set according to the actual situation. This application embodiment does not limit this.

[0056] like Figure 4 As shown, the ratio of the depth of the cut-off groove 14 along the axial direction X to the thickness of the body 12 along the axial direction X can be less than or equal to 50%. For example, this ratio can be any value among 5%, 10%, 20%, 30%, 40%, 45%, and 50%, or a range between any two values. This arrangement can achieve the machining of the cut-off groove 14 while avoiding excessive reduction in the structural strength of the body 12.

[0057] Optionally, such as Figure 4 As shown, two adjacent protrusions 13 include an inner protrusion 131 and an outer protrusion 132 arranged at a distance along the radial direction Y. Along the radial direction Y, the distance between the cutting groove 14 and the inner protrusion 131 is less than the distance between the cutting groove 14 and the outer protrusion 132.

[0058] In this embodiment, by setting the distance between the cutting groove 14 and the inner protrusion 131 to be smaller than the distance between the cutting groove 14 and the outer protrusion 132, the cutting groove 14 is closer to the inner protrusion 131. This results in more body parts 12 being cut off at the cutting groove 14, enabling the recovery of more body parts 12 and improving the recovery rate. Simultaneously, after cutting, less body part 12 remains on the outer side of the inner protrusion 131, facilitating subsequent processing and improving processing efficiency.

[0059] Specifically, let A be the distance between the inner protrusion 131 and the outer protrusion 132, let B be the distance between the cutting groove 14 and the inner protrusion 131, and let C be the distance between the cutting groove 14 and the outer protrusion 132. Then A = B + C, and B < C. Thus, B / A < 50%, and the value of B / A can be any value among 0, 10%, 20%, 30%, 40%, and 49%, or any range between any two values.

[0060] When B / A=0, the inner wall of the cut-off groove 14 is aligned with the outer wall of the inner protrusion 131. In this way, the edge of the cut-off body 12 is aligned with the outer edge of the inner protrusion 131, resulting in a smoother structure.

[0061] Optionally, such as Figure 4 As shown, the cross-sectional area of ​​the cut-off groove 14 gradually increases from the side of the body 12 facing the receiving cavity 30 to the side away from the receiving cavity 30.

[0062] In this embodiment, the cross-sectional area of ​​the cutting groove 14 gradually increases from the side of the body 12 facing the receiving cavity 30 to the side away from the receiving cavity 30; that is, the cross-sectional area of ​​the cutting groove 14 gradually increases from the inside to the outside of the entire shell structure. This makes the opening area of ​​the cutting groove 14 larger than the bottom area, making it easier to insert cutting tools (such as cutters, scissors, etc.) into the cutting groove 14. At the same time, this design also reduces the amount of machining required when making the cutting groove 14 in the body 12, thus reducing the impact on the structural strength of the body 12.

[0063] Specifically, such as Figure 4 As shown, the cutting groove 14 can be a trapezoidal groove, a triangular groove, etc. The cutting groove 14 has an inner groove wall and an outer groove wall arranged at intervals along the radial Y direction, wherein the inner groove wall can be parallel to the axial direction X, and the outer groove wall is inclined to the axial direction X. In this way, after cutting, the inner groove wall of the cutting groove 14 is aligned with the outer wall of the side plate 20.

[0064] Optionally, such as Figure 2 and Figure 4 As shown, the main body 12 has a pressure relief groove 15, which is recessed in the middle part 121 on the side away from the receiving cavity 30.

[0065] In this embodiment, a pressure relief groove 15 is provided in the middle portion 121, providing a weaker area for the casing structure. When the pressure inside the cylindrical battery is high, the pressure can break through the pressure relief groove 15, thereby releasing pressure. The pressure relief groove 15 provides a predetermined release path for high-pressure gas and substances inside the cylindrical battery, improving the safety performance of the cylindrical battery. Furthermore, since the middle portion 121 is located in the middle of the base plate 10, and the protrusions 13 are all located outside the middle portion 121, the base plate 10 has a pressure relief groove 15 in the middle portion 121 regardless of the size of the cylindrical battery, thus achieving the setting of the pressure relief groove 15 for all sizes of cylindrical batteries.

[0066] Specifically, the pressure relief groove 15 can surround the center line M once, forming a complete pressure relief structure along the circumference of the cylindrical battery to ensure the pressure relief effect.

[0067] In some embodiments, the pressure relief groove 15 can be a rectangular groove, a semi-circular groove, a trapezoidal groove, or a triangular groove, etc., and can be flexibly set according to the actual situation. This application embodiment does not limit this.

[0068] In some embodiments, the distance between the bottom of the pressure relief groove 15 and the surface of the middle portion 121 facing into the receiving cavity 30 is denoted as D, that is, the remaining thickness of the middle portion 121 in the pressure relief groove 15 is D, and the distance between the bottom of the cut-off groove 14 and the surface of the edge portion 122 facing into the receiving cavity 30 is denoted as E, that is, the remaining thickness of the edge portion 122 in the cut-off groove 14 is E. By setting D < E, the remaining thickness of the middle portion 121 in the pressure relief groove 15 is less than the remaining thickness of the edge portion 122 in the cut-off groove 14, thus ensuring that when the pressure inside the cylindrical battery is high, pressure is relieved through the pressure relief groove 15.

[0069] Optionally, embodiments of this application propose a cylindrical battery, including the casing structure of the cylindrical battery of any of the above embodiments.

[0070] In this embodiment, since the cylindrical battery includes the casing structure of any of the above embodiments, it possesses the beneficial effects of the casing structure of a cylindrical battery. Specifically, by providing multiple annular mounting portions on one side of the base plate 10 along its axis, with these mounting portions arranged radially at Y-intervals, such that adjacent annular mounting portions have different diameters, and the side plate 20 can be selectively connected to one mounting portion, the side plate 20 and the base plate 10 forming a receiving cavity 30, thereby forming the casing of the cylindrical battery. In practical use, a matching mounting portion on the base plate 10 can be selected as the target mounting portion according to the diameter of the prepared cylindrical battery. The side plate 20 is then connected to the target mounting portion, and the portion of the base plate 10 located outside the target mounting portion (if any) is cut off to obtain the desired cylindrical casing. Thus, the casing structure of this application is applicable to the manufacture of cylindrical batteries of various diameters, eliminating the need to design and manufacture casing preparation molds of multiple sizes, thereby reducing the number of molds and lowering processing costs.

[0071] Specifically, the cylindrical battery also includes a winding core, a top cover assembly, etc. The winding core is inserted into the receiving cavity 30, and then the top cover assembly is installed on the cavity opening 31 of the receiving cavity 30 to seal the receiving cavity 30. Then, electrolyte is injected into the receiving cavity 30 through the injection hole on the top cover assembly, and finally the injection hole is sealed.

[0072] In specific applications, the cylindrical battery can be at least one of lithium-ion batteries, solid-state batteries, lead-acid batteries, and nickel-metal hydride batteries. Those skilled in the art can choose according to actual needs, and the embodiments of this application do not limit this.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing structure for a cylindrical battery, having a centerline (M) extending axially (X) and radially (Y), characterized in that, include: The base plate (10) has a plurality of mounting portions on one side along the axial direction (X), the mounting portions being arranged around the center line (M), and the plurality of mounting portions being spaced apart along the radial direction (Y); Side plate (20), which may be selectively connected to one of the mounting parts, the base plate (10) and the side plate (20) forming a receiving cavity (30).

2. The casing structure of the cylindrical battery according to claim 1, characterized in that, The mounting part is a slot (11) provided on the base plate (10), and the side plate (20) is inserted into the slot (11).

3. The casing structure of the cylindrical battery according to claim 2, characterized in that, The multiple slots (11) are arranged coaxially.

4. The casing structure of the cylindrical battery according to claim 2, characterized in that, The base plate (10) includes a body (12) and a plurality of protrusions (13). The protrusions (13) are connected to one side of the body (12) along the axial direction (X) and are arranged around the center line (M). The plurality of protrusions (13) are arranged at intervals along the radial direction (Y). Each protrusion (13) is provided with a slot (11).

5. The casing structure of the cylindrical battery according to claim 4, characterized in that, The body (12) includes a middle part (121) and an edge part (122) that are connected to each other. The edge part (122) is disposed around the middle part (121), and the protrusion (13) is connected to the edge part (122). The middle portion (121) protrudes into the receiving cavity (30) to form a protrusion (123), and the end face of the protrusion (123) facing the receiving cavity (30) is higher than the end face of the protrusion (13) facing the receiving cavity (30).

6. The casing structure of the cylindrical battery according to claim 4, characterized in that, The body (12) has a cut-off groove (14) between two adjacent protrusions (13), the cut-off groove (14) is recessed on the side of the body (12) away from the receiving cavity (30), and the cut-off groove (14) is arranged around the center line (M).

7. The casing structure of the cylindrical battery according to claim 6, characterized in that, Two adjacent protrusions (13) include an inner protrusion (131) and an outer protrusion (132) arranged at intervals along the radial direction (Y). Along the radial direction (Y), the distance between the cut-off groove (14) and the inner protrusion (131) is less than the distance between the cut-off groove (14) and the outer protrusion (132).

8. The casing structure of the cylindrical battery according to claim 6, characterized in that, The cross-sectional area of ​​the cut-off groove (14) gradually increases from the side of the body (12) toward the receiving cavity (30) to the side away from the receiving cavity (30).

9. The casing structure of the cylindrical battery according to claim 5, characterized in that, The body (12) has a pressure relief groove (15), which is recessed in the middle part (121) on the side opposite to the receiving cavity (30).

10. A cylindrical battery, characterized in that, The casing structure includes that of a cylindrical battery as described in any one of claims 1 to 9.

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