Cylindrical shell structure and cylindrical battery
By setting a central rod in the shell body of the cylindrical battery as the positioning center of the winding core, the problems of collapse of the inner ring pole piece and low liquid injection efficiency are solved, and better battery cycle performance and liquid injection efficiency are achieved.
Patent Information
- Application Number
- CN202420643111.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-03-29
AI Technical Summary
Since the center of the existing cylindrical batteries are hollow, the inner ring pole plate lacks positioning support during charging and discharging, which is prone to collapse, and the reflow solder cannot be concentrically positioned, affecting battery performance.
A cylindrical shell structure is designed, including the shell body, a central rod and a liquid injection hole. The central rod serves as the positioning center of the winding core and is connected to the plane area of the shell body. The hollow structure improves the liquid injection efficiency.
The central rod provides radial support to avoid collapse of the inner ring pole pieces, improves the battery's charge and discharge cycle performance, and improves liquid injection efficiency through the hollow structure.
Smart Images
Figure CN222380615U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of cylindrical batteries, and in particular to a cylindrical shell structure and a cylindrical battery. Background Art
[0002] The cylindrical batteries currently in use have a hollow core at the center, so the inner ring electrode of the inner ring of the core has no positioning support relative to the cylindrical battery shell. During the charge and discharge process, the center will collapse, which will lead to the problem of poor charge and discharge cycle. In addition, cylindrical batteries also have the problem of reflow welding being unable to be concentrically positioned. Utility Model Content
[0003] The present disclosure provides a cylindrical shell structure and a cylindrical battery to at least solve the above technical problems existing in the prior art.
[0004] According to a first aspect of the present disclosure, there is provided a cylindrical shell structure, comprising: a shell body, a center rod and an injection hole, wherein the shell body comprises a circumferential side region and a planar region connected to the bottom of the circumferential side region; the center rod is constructed as a hollow column structure, the center rod longitudinally extends into the shell body and is connected to a preset position of the planar region, and the center rod is configured as the positioning center of the winding core; the injection hole is formed at the preset position, and the planar region is connected to the center rod via the injection hole; the circumferential surface of the center rod has a hollow structure, and the electrolyte is injected into the shell body via the injection hole and the hollow structure in sequence.
[0005] In some embodiments, the central rod and the planar area are welded into an integral structure.
[0006] In some embodiments, the hollow structure is configured as a hole-shaped structure.
[0007] In some embodiments, the porous structure is configured as a porous structure.
[0008] In some embodiments, the winding core has an inner ring pole piece after being wound and formed, and the inner ring pole piece is in direct contact or abutment with the peripheral area of the center rod.
[0009] In some embodiments, the plane area of the shell body has an accommodating space on a side facing away from the center rod, and the accommodating space is used to install a sealing nail.
[0010] According to a second aspect of the present disclosure, a cylindrical battery is provided, comprising the cylindrical shell structure as above, and further comprising: a winding core, wherein the winding core is accommodated in the shell body, and the top of the winding core is welded and sealed to the other end to form a battery cell.
[0011] In some embodiments, the winding core includes an inner ring pole piece, and the inner ring pole piece is in direct contact or abutment with the peripheral area of the center rod.
[0012] In some embodiments, the shell body and the core bottom are configured to be connected by penetration welding.
[0013] Using the cylindrical shell structure and cylindrical battery disclosed in the present invention, a center rod is set at the center of the shell body. The center rod is constructed as a hollow column structure, and the center rod is connected to a preset position of the plane area of the shell body. Exemplarily, the preset position can be the center position of the shell body. In this way, after the core is wound and formed, the center rod can be used as a positioning center and accommodated in the shell body. In the prior art, the center of the core is hollow, and the hollow position cannot provide radial support force to the inner circle pole piece. Using the shell body with a center rod of the present application, during the charge and discharge cycle of the cylindrical battery, the inner circle pole piece of the core can contact the center rod. In this way, the center rod can provide radial support force to the inner circle pole piece, which can effectively avoid the collapse of the inner circle pole piece. The injection hole connects the shell body with the center rod, and the hollow structure connects the center rod with the shell body. In this way, the injection efficiency of the cylindrical battery can be improved.
[0014] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:
[0016] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.
[0017] Figure 1 A schematic diagram of the axial structure of the shell body of the cylindrical shell structure of an embodiment of the present disclosure is shown.
[0018] Description of the numbers in the figure:
[0019] 10-cylindrical shell structure; 11-shell body; 111-peripheral area; 112-plane area; 12-center rod; 121-hollow structure; 13-liquid injection hole. DETAILED DESCRIPTION
[0020] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.
[0021] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that spatially relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.
[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.
[0023] It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein are used to be implemented in an order other than those illustrated or described herein.
[0024] In the description of the present disclosure, it is necessary to understand that the orientation or positional relationship indicated by the directional words is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise stated, these directional words 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 cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.
[0025] The disclosed embodiments provide a cylindrical shell structure and a cylindrical battery, which can avoid the collapse of the inner circle pole piece of the winding core and improve the liquid injection efficiency. The specific contents are as follows:
[0026] refer to Figure 1 , an embodiment of the present disclosure provides a cylindrical shell structure 10 and a related structural diagram of a cylindrical battery, wherein the cylindrical shell structure 10 includes: a shell body 11, a center rod 12 and a liquid injection hole 13, wherein the shell body 11 is constructed as a shell structure with an opening at the top, and in order to adapt to the scene application of the cylindrical battery, the shell structure adopts a columnar shell structure, specifically, the shell body 11 includes a peripheral side area 111 and a plane area 112 connected to the bottom of the peripheral side area 111, wherein the peripheral side area 111 and the plane area 112 are an integral structure, and can be integrally formed by injection molding.
[0027] The central rod 12 of the embodiment of the present disclosure may be made of a conductive material. For example, the central rod 12 may be made of a conductive metal material such as aluminum or copper.
[0028] In addition, the center rod 12 is constructed as a hollow column structure. The center rod 12 is constructed as a hollow column structure extending along its own height direction. Considering the geometric spatial relationship between the center rod 12 and the shell body 11, the center rod 12 extends longitudinally into the shell body 11 and is connected to a preset position of the plane area 112. Exemplarily, the preset position can be the center position of the shell body 11. In this way, the center rod 12 serves as the positioning center of the core, and the injection hole 13 is formed at the center position of the plane area 112. The plane area 112 is connected to the center rod 12 via the injection hole 13; in this way, after the core is wound and formed, the center rod 12 can be used as the positioning center and accommodated in the shell body 11.
[0029] In the prior art, the center of the winding core is hollow, and the hollow position cannot provide radial support force to the inner circle pole piece. By using the shell body 11 with the center rod 12 of the present application, during the charge and discharge cycle of the cylindrical battery, the inner circle pole piece of the winding core can contact the center rod 12. In this way, the center rod 12 can provide radial support force to the inner circle pole piece, which can effectively avoid the collapse problem of the inner circle pole piece.
[0030] Considering the completion of the injection step and the improvement of the injection efficiency during the cylindrical battery manufacturing process, a hollow structure 121 is set on the circumferential surface of the center rod 12, and the electrolyte is injected into the shell body 11 through the injection hole 13 and the hollow structure 121 in sequence. The embodiment of the present disclosure does not limit the hollow structure 121 of the center rod 12, including but not limited to various shapes of hole structures, or multiple rows and columns of hole structures arranged in various arrangements. Exemplarily, the hollow structure 121 is a multi-layer porous structure around the center rod 12. In this way, the injection hole 13 connects the shell body 11 with the center rod 12, and the hollow structure 121 connects the center rod 12 with the shell body 11, so that the shell body 11 can be injected through the injection hole 13, and the electrolyte is injected from the center of the cylindrical battery to the periphery of the center rod 12 along the inner cavity channel of the center rod 12, which can be understood as injected along the same inlet and flows into the shell body 11 in multiple directions through the circumferential hollow structure 121 of the center rod 12, which can accelerate the injection speed into the shell body 11 along each horizontal section of the center rod 12, thereby improving the injection efficiency of the cylindrical battery.
[0031] Considering the structural stability of the shell body 11 with the central rod 12, the central rod 12 is welded to an integral structure with the plane area 112. It can be understood that welding the central rod 12 to the shell body 11 can ensure the accuracy of the position of the central rod 12 relative to the shell body 11, thereby improving the yield rate.
[0032] Considering the actual application scenario of the shell structure of the embodiment of the present disclosure, as the shell structure of the cylindrical battery, the winding core is accommodated in the shell body 11, and the winding core has an inner ring pole piece after winding, and the inner ring pole piece is in direct contact or abutment with the peripheral area 111 of the center rod 12. In this way, during the long cycle of charging and discharging of the cylindrical battery, the stress of the inner ring pole piece is released to the center rod 12, and the center rod 12 provides support for the inner ring pole piece, thereby ensuring that the inner ring pole piece will not collapse, ensuring the tightness of the pole piece support, and improving the cycle performance.
[0033] Considering the application safety of cylindrical batteries, the flat area 112 of the shell body 11 has a storage space on the side facing away from the center rod 12, and the storage space is used to install the sealing nail. For example, the explosion-proof valve can be used as a sealing nail for sealing, and the sealing here can be understood as sealing the injection hole 13. When an internal short circuit occurs, the center rod 12 can be used as an exhaust channel for directional explosion and valve opening to improve safety performance.
[0034] The disclosed embodiment also provides a cylindrical battery, including the cylindrical shell structure 10 as above, and also including: a winding core, the winding core is accommodated in the shell body 11, and the top of the winding core is welded and sealed with the other end to form a battery cell. Specifically, the winding core includes an inner ring pole piece, and the inner ring pole piece is in direct contact or abutment with the peripheral area 111 of the center rod 12. Furthermore, the shell body 11 and the bottom of the winding core are configured to be connected by penetration welding. All the effects of the above-mentioned cylindrical shell structure 10 can be achieved.
[0035] In actual application, the material of the center rod 12 is aluminum, hollow inside, and has a diameter range of 2-10mm; the surface of the center rod 12 has a porous structure with a pore size of 0.5-500um; the center rod 12 is welded to the bottom of the shell (planar area 112) to form an integrated structure, and the center is an injection channel, that is, the hollow part of the center rod 12 is used as the injection channel; the core is passed through the center rod 12 for positioning, that is, the core is accommodated in the shell body 11 with the center rod 12 as the positioning center; the planar area 112 is connected to the bottom of the core by penetration welding, and the top of the core is welded and sealed with the other end to form a battery cell; the injection hole 13 in the planar area 112 is used to inject liquid into the battery cell, and after pre-charging, the bottom injection hole 13 is sealed with an explosion-proof valve as a sealing nail.
[0036] In summary, the cylindrical shell structure 10 and cylindrical battery of the disclosed embodiment use the center rod 12 as a welding positioning device to absorb welding tolerances, effectively improve welding quality, and reduce production costs; the hollow porous structure center rod 12 can improve injection efficiency and reduce manufacturing costs; the explosion-proof valve is a sealing nail, and the exhaust is positioned by the center rod 12, which can shorten the valve opening time and improve safety performance; the internal pole piece of the winding core is supported by the center rod 12, which can solve the problem of inner ring pole piece collapse and improve cycle performance.
[0037] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.
[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0039] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A cylindrical shell structure, characterized in that: include: A shell body (11), the shell body (11) comprising a peripheral region (111) and a plane region (112) connected to the bottom of the peripheral region (111); A central rod (12), the central rod (12) being constructed as a hollow column structure, the central rod (12) extending longitudinally into the shell body (11) and connected to a preset position of the plane area (112), the central rod (12) being configured as a positioning center of the winding core; a liquid injection hole (13), wherein the liquid injection hole (13) is formed at the preset position, and the plane area (112) is connected to the central rod (12) via the liquid injection hole (13); The circumferential surface of the central rod (12) has a hollow structure (121), and the electrolyte is injected into the shell body (11) through the injection hole (13) and the hollow structure (121) in sequence.
2. The cylindrical shell structure according to claim 1, characterized in that: The central rod (12) and the plane area (112) are welded to form an integrated structure.
3. The cylindrical shell structure according to claim 2, characterized in that: The hollow structure (121) is configured as a hole-shaped structure.
4. The cylindrical shell structure according to claim 3, characterized in that: The pore structure is configured as a porous structure.
5. The cylindrical shell structure according to claim 4, characterized in that: After being wound and formed, the winding core has an inner ring pole piece, and the inner ring pole piece is in direct contact or abutment with the peripheral area (111) of the center rod (12).
6. The cylindrical shell structure according to claim 5, characterized in that: The plane area (112) of the shell body (11) has an accommodation space on the side facing away from the center rod (12), and the accommodation space is used to install a sealing nail.
7. A cylindrical battery, characterized in that: It comprises the cylindrical shell structure (10) as described in any one of claims 1 to 6, and also comprises: a winding core, wherein the winding core is accommodated in the shell body (11), and the top of the winding core is welded and sealed to the other end to form a battery core.
8. The cylindrical battery according to claim 7, characterized in that: The winding core comprises an inner ring pole piece, and the inner ring pole piece is in direct contact or abutment with a peripheral area (111) of the center rod (12).
9. The cylindrical battery according to claim 8, characterized in that: The shell body (11) and the bottom of the winding core are configured to be connected by penetration welding.