Top cover structure of cylindrical battery and cylindrical battery

Abstract

The application discloses a top cover structure of a cylindrical battery and the cylindrical battery. The top cover structure comprises a top cover sheet, a boss for being used as a positive pole is arranged on the middle part of the top cover sheet upwards, a first air hole for pressure relief is arranged on the boss, and the top cover sheet and the boss are integrally formed. A processing hole for laser welding is arranged on the middle part of the boss. The top cover structure of the cylindrical battery and the cylindrical battery provided by the application are integrally formed by the top cover sheet and the boss for being used as the positive pole, the pole is not required to be additionally installed and arranged, the process complexity can be reduced, the sealing reliability problem of the pole installation can be avoided, the jelly-roll is facilitated to be assembled in series and / or in parallel, and the like.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and particularly relates to a top cover structure of a cylindrical battery and a cylindrical battery. Background Technology

[0002] In the field of cylindrical battery technology, the disclosed positive electrode top cover structure design typically includes a bare plate structure, on which the electrode post and explosion-proof valve assembly are integrated. However, this structural design has the following technical problems in practical applications:

[0003] 1. Insufficient process complexity and sealing reliability

[0004] In related technologies, the terminals need to be fixed to the surface of the bare plate through additional processes such as welding and riveting, and insulation and sealing between the terminals and the bare plate are achieved by structures such as sealing rings or laser welding. This design increases the number of manufacturing processes, and the sealing structure is susceptible to environmental factors such as thermal expansion and vibration over a long period of time, which can easily lead to sealing failure or electrolyte leakage, thereby affecting the overall lifespan and safety of the battery.

[0005] 2. Low space utilization and limited module assembly efficiency

[0006] The terminals and explosion-proof valves are both centrally located on the surface of the bare plate, occupying a large lateral space. This results in limited space for welding / riveting the terminals and connecting the terminals when adjacent batteries are assembled in series and / or parallel via connecting tabs (connecting tabs). Irregular designs or increased bridging distances are required to avoid short circuits. This layout not only reduces the module's energy density but also increases the difficulty of module assembly and manufacturing costs. Utility Model Content

[0007] The purpose of this application is to provide a top cover structure for a cylindrical battery and a cylindrical battery to solve at least one of the above-mentioned technical problems.

[0008] To achieve the above-mentioned objectives, the technical solution adopted in this application is as follows:

[0009] This application provides a top cover structure for a cylindrical battery, including:

[0010] The top cover has a boss in the middle that is used as a positive terminal post. The boss has a first vent hole for pressure relief. The top cover and the boss are integrally formed.

[0011] In some embodiments, the boss has a machining hole in the middle for laser welding to extend into.

[0012] In some embodiments, the top cover structure further includes:

[0013] The flip plate has its periphery used for electrical connection welding to the inside of the top cover plate.

[0014] The connecting piece is used to connect the battery cell tabs. The middle part of the connecting piece has a protrusion forming a thin sheet for laser welding connection with the middle part of the flip piece. The connecting piece is provided with a second vent hole for pressure relief.

[0015] A ring-shaped insulating element is disposed between the top cover plate and the connecting plate.

[0016] This application also provides a cylindrical battery, including the top cover structure described above.

[0017] Compared with the prior art, the beneficial effects of the embodiments of this application are:

[0018] The embodiments of this application provide a top cover structure for a cylindrical battery and a cylindrical battery. The top cover sheet and the boss used as a positive electrode post are integrally formed, eliminating the need for additional installation of the electrode post. This not only reduces process complexity but also avoids sealing reliability issues related to electrode post installation and facilitates series and / or parallel assembly of the battery sheets. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A front view of the top cover sheet provided in an embodiment of this application is shown.

[0021] Figure 2 A perspective view of the top cover sheet provided in an embodiment of this application is shown.

[0022] Figure 3 An exploded view of the top cover structure provided in an embodiment of this application is shown.

[0023] Figure 4 An exploded top view of the top cover structure provided in an embodiment of this application is shown.

[0024] Figure 5 An exploded bottom view of the top cover structure provided in an embodiment of this application is shown.

[0025] Figure 6 A front view of the top cover structure provided in an embodiment of this application is shown.

[0026] Figure 7 A perspective view of the top cover structure provided in an embodiment of this application is shown.

[0027] Figure 8A cross-sectional view of the top cover structure provided in an embodiment of this application is shown.

[0028] Illustration:

[0029] 10. Top cover plate; 12. Boss; 121. First vent hole; 122. Machining hole; 20. Flip plate; 21. Annular notch; 30. Annular insulating part; 31. Arc groove; 40. Connecting plate; 41. Thin sheet part; 42. Second vent hole. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0034] Please see Figure 1 and Figure 2 As shown, this application embodiment provides a top cover structure for a cylindrical battery, including: a top cover sheet 10, a boss 12 for use as a positive electrode post is provided in the middle of the top cover sheet 10, and a first vent hole 121 for pressure relief is provided on the boss 12. The top cover sheet 10 and the boss 12 are integrally formed.

[0035] The top cover structure provided in this embodiment has a top cover plate 10 and a boss 12 used as a positive electrode post integrally formed, eliminating the need for additional electrode post installation. This not only reduces process complexity but also avoids sealing reliability issues with electrode post installation and facilitates series and / or parallel assembly of the electrodes.

[0036] As an example, the boss 12 has a machining hole 122 in the middle for laser welding to extend into.

[0037] Please see Figures 3 to 8 As shown, in some embodiments of this application, the top cover structure further includes:

[0038] The rotating piece 20 has its periphery used for electrical connection welding to the inside of the top cover piece 10. For example, laser welding is used to ensure an airtight seal.

[0039] The connecting piece 40 is used to connect the battery cell tab. The middle part of the connecting piece 40 has a protrusion forming a thin sheet 41 for laser welding connection with the middle part of the flip piece 20. The connecting piece 40 has a second vent hole 42 for pressure relief.

[0040] An annular insulating element 30 is disposed between the top cover plate 10 and the connecting plate 40.

[0041] Therefore, during assembly, the top cover plate 10 and the flip plate 20 are first welded together, and then the annular insulating part 30 is placed between the connecting piece 40 and the top cover plate 10. The welding equipment realizes laser welding between the thin sheet 41 and the flip plate 20 through the machining hole 122.

[0042] Therefore, during use, when overcurrent heating occurs or the internal air pressure of the battery is too high, the middle part of the flip piece 20 (i.e. the part connected to the thin sheet 41) flips upward, causing the thin sheet 41 to tear, thereby disconnecting the electrical connection between the connecting piece 40 and the flip piece 20, thus achieving overcurrent protection and preventing excessive internal air pressure.

[0043] As an example, the edge of the flip piece 20 is also provided with annular notches 21.

[0044] Therefore, during use, if the internal air pressure of the battery increases further after the thin sheet 41 is torn, the annular notch 21 of the flip piece 20 will tear, thereby further depressurizing.

[0045] Therefore, the top cover structure provided in this application embodiment, the flip-over piece 20 can function as an explosion-proof valve, and is located inside the top cover piece 10, avoiding the potential safety risks of the exposed design of the explosion-proof valve, such as the risk of bumping the explosion-proof valve.

[0046] As an example, the bottom of the annular insulating member 30 is provided with an arc-shaped groove 31, and the top of the connecting piece 40 is provided with an arc-shaped protrusion for embedding into the arc-shaped groove 31. Therefore, during assembly, concentric positioning can be achieved through the arc-shaped groove 31 and the arc-shaped protrusion, improving assembly accuracy.

[0047] In some embodiments of this application, a cylindrical battery is also provided, including the top cover structure described above, which also has the aforementioned beneficial effects.

[0048] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A top cover structure of a cylindrical battery, characterized by comprising: include: The top cover plate has a boss in the middle for use as a positive electrode post, and a first vent hole for pressure relief is provided on the boss. The top cover plate and the boss are integrally formed. The boss has a machining hole in the middle for laser welding to extend into. A flip piece, the periphery of which is used for welding to the inner side of the top cover piece; A connecting piece is used to connect the battery cell tabs. The middle part of the connecting piece has a protrusion forming a thin sheet portion for laser welding connection with the middle part of the flip piece. A second vent hole for pressure relief is provided on the connecting piece. An annular insulating element is disposed between the top cover plate and the connecting plate.

2. A cylindrical battery, characterized by Includes the top cover structure as described in claim 1.

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