Stop frame mechanism for cylindrical battery cell and its preparation process

Abstract

The present application provides a stop frame mechanism for cylindrical battery cells and a preparation process thereof. The above-mentioned stop frame mechanism for cylindrical battery cells includes a stop frame and a current collecting plate, the stop frame is formed with a cover groove and a lead-out port that are interconnected; the current collecting plate is limitedly accommodated in the inner cavity of the cover groove, and the current collecting plate includes lead-out columns and a welding body that are interconnected, the lead-out columns are passed through the lead-out port so that the lead-out columns are used to connect to the poles, and the side of the welding body away from the lead-out columns is used to weld to the winding core so that the inner peripheral wall of the cover groove is sleeved on the outer peripheral edge of the winding core. By limiting the welding body and the lead-out column to be accommodated in the cover groove, using the inner peripheral wall of the cover groove to sleeve on the outer peripheral edge of the winding core, and welding the welding body to the winding core, the problem of longitudinal and lateral shaking of the winding core in the battery shell is avoided, and the problem of desoldering at the welding part between the current collecting plate and the winding core is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a stopper mechanism for a cylindrical battery cell and a preparation process thereof. Background Art

[0002] Cylindrical batteries are widely used in defense, aerospace, and transportation due to their high energy density, long lifespan, and safety. Existing cylindrical battery covers and cores are connected by welding the core's tabs to a collector plate. To facilitate insertion of the collector plate into the battery case, the plate is bent. However, due to the constant vibrations experienced by power batteries, cores with smaller diameters or heights can vibrate within the battery case, leading to desoldering at the welds between the collector plate and core, and even the risk of fracture at the bent portion of the collector plate.

[0003] To this end, the Chinese patent with patent number CN108281578 B proposes a vibration-proof electrode cover for cylindrical batteries, which sets a stop frame at one end of the electrode (i.e., the current collecting disk). After the winding core and the current collecting disk are welded, the vibration-proof stop column of the stop frame is used to support the winding core in the height direction of the winding core, that is, the vibration-proof stop column is used to contact the current collecting disk surface welded to the winding core, so that the winding core located inside the battery shell no longer shakes in the height direction (i.e., longitudinally), and the vibration-proof stop column of the stop frame adopts a symmetrical multi-point design to reduce the risk of desoldering of the current collecting disk of the electrode and breakage at the bending point.

[0004] The above patent can effectively avoid the problem of longitudinal shaking of the winding core in the battery shell. However, the technical solution of the patent also has the following problems:

[0005] 1. It only prevents the core from shaking longitudinally in the battery case, but fails to prevent the core from shaking laterally in the battery case. This leaves the welding area between the collector plate and the core at risk of desoldering.

[0006] 2. There is a gap between the stop frame and its anti-vibration stop column. The tabs of the winding core are likely to come into contact with the battery shell through this gap, causing a short circuit. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a stopper mechanism for cylindrical battery cells and its preparation process that can avoid longitudinal and lateral shaking of the winding core in the battery shell, thereby preventing the welding part between the collecting plate and the winding core from desoldering.

[0008] The object of the present invention is achieved through the following technical solutions:

[0009] A stop frame mechanism for a cylindrical battery cell includes a stop frame and a current collecting plate, the stop frame is formed with a cover groove and a lead-out port that are interconnected; the current collecting plate is limitedly accommodated in the inner cavity of the cover groove, the current collecting plate includes lead-out columns and a welding body that are interconnected, the lead-out columns are passed through the lead-out port so that the lead-out columns are used to be connected to the poles, and the side of the welding body facing away from the lead-out columns is used to be welded to the winding core so that the inner peripheral wall of the cover groove is sleeved on the outer peripheral edge of the winding core.

[0010] In one embodiment, the stop frame includes a cover portion and a barrier portion, and two openings are respectively provided at both ends of the barrier portion. The cover portion is connected to the inner wall of one of the openings so that the barrier portion and the cover portion jointly form the cover groove, and the cover portion is provided with a liquid hole and the outlet, and the liquid hole is connected to the cover groove.

[0011] In one embodiment, the welding body includes a connecting ring and a plurality of radial welding strips, the outer periphery of the connecting ring is connected to the inner peripheral wall of the barrier portion, each of the radial welding strips is connected to the inner periphery of the connecting ring, each of the radial welding strips is arranged at circumferential intervals along the inner periphery of the connecting ring, and a plurality of the radial welding strips are connected to each other so that the welding body forms a connecting portion, and the lead-out column is connected to the connecting portion.

[0012] In one embodiment, an inner ring cavity is formed on the inner periphery of the connecting ring, and each of the radial welding strips is connected to the inner wall of the inner ring cavity so that the inner ring cavity is divided into multiple liquid-passing intervals, and every two adjacent radial welding strips and the connecting ring together form a liquid-passing interval.

[0013] A process for preparing a cylindrical battery cell stopper mechanism, for obtaining the cylindrical battery cell stopper mechanism as described in any of the above embodiments, the process for preparing the cylindrical battery cell stopper mechanism comprising the following steps:

[0014] Forming a welding body;

[0015] Welding the lead-out column to the welding body to form a current collecting plate;

[0016] A stop frame is formed, wherein the stop frame is formed with a cover groove and an outlet that are interconnected;

[0017] The collecting plate is assembled on the stop frame so that the collecting plate is limitedly accommodated in the cover groove, and the lead-out column is passed through the lead-out port.

[0018] In one embodiment, the step of welding the lead-out column to the welding body is specifically as follows:

[0019] The lead-out column is welded to the connecting portion.

[0020] In one embodiment, the welding body includes a connecting ring and a plurality of radial welding strips; and the step of forming the welding body includes:

[0021] placing a plurality of the radial welding bars on a current collecting plate welding jig;

[0022] Using a welder to weld the plurality of radial welding strips together to form a connecting portion;

[0023] Placing a plurality of radial welding bars in the inner ring cavity of the connecting ring,

[0024] Each of the radial welding strips is welded to the inner wall of the inner ring cavity to form the welding body.

[0025] In one embodiment, the welding peak power of the welder is 4.4KW to 4.8KW.

[0026] In one embodiment, the stop frame includes a covering portion and a blocking portion; and the step of forming the stop frame includes:

[0027] The covering portion is connected to one end of the blocking portion to form the covering groove together.

[0028] In one embodiment, after the step of connecting the covering portion to one end of the barrier portion, the preparation process of the cylindrical battery cell stopper mechanism further includes:

[0029] A liquid hole and the outlet are processed on the cover portion.

[0030] Compared with the prior art, the present invention includes but is not limited to the following advantages:

[0031] 1. By placing the welding body and the lead-out column in the cover groove, the inner peripheral wall of the cover groove is sleeved on the outer peripheral edge of the winding core, and the welding body is welded to the winding core, thereby preventing the winding core from shaking longitudinally and laterally in the battery shell, and preventing the welding part between the current collecting plate and the winding core from being desoldered;

[0032] 2. Since the inner peripheral wall of the covering groove is sleeved on the outer peripheral edge of the winding core, the pole ear of the winding core is also located in the covering groove. Therefore, the inner peripheral wall of the covering groove can protect the pole ear of the winding core to avoid the problem of short circuit caused by the pole ear touching the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a schematic structural diagram of a cylindrical battery cell retaining bracket mechanism according to one embodiment;

[0035] Figure 2 for Figure 1 Another structural schematic diagram of the cylindrical battery cell stopper mechanism shown;

[0036] Figure 3 for Figure 1 An exploded view of a retaining frame mechanism for cylindrical cells is shown;

[0037] Figure 4 The figure is a flow chart of a process for preparing a retaining frame mechanism for a cylindrical battery cell according to an embodiment. DETAILED DESCRIPTION

[0038] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] The present application provides a stop frame mechanism for a cylindrical battery cell, comprising a stop frame and a current collecting plate, wherein the stop frame is formed with a cover groove and a lead-out port that are interconnected; the current collecting plate is limitedly accommodated in the inner cavity of the cover groove, and the current collecting plate comprises lead-out columns and a welding body that are interconnected, wherein the lead-out columns are passed through the lead-out port so that the lead-out columns are used to be connected to the poles, and the side of the welding body that is away from the lead-out columns is used to be welded to the winding core so that the inner peripheral wall of the cover groove is sleeved on the outer peripheral edge of the winding core.

[0042] To better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below with reference to specific embodiments:

[0043] See also Figures 1 to 3 , which is a stop frame mechanism 10 for a cylindrical battery cell according to an embodiment of the present invention, includes a stop frame 100 and a current collecting plate 200, wherein the stop frame 100 is formed with a cover groove 101 and a lead-out port 102 that are interconnected; the current collecting plate 200 is limitedly accommodated in the inner cavity of the cover groove 101, and the current collecting plate 200 includes a lead-out column 210 and a welding body 220 that are connected to each other, wherein the lead-out column 210 is passed through the lead-out port 102 so that the lead-out column 210 is used to be connected to a pole (not shown in the figure), and the side of the welding body 220 facing away from the lead-out column 210 is used to be welded to a winding core (not shown in the figure), so that the inner peripheral wall of the cover groove 101 is sleeved on the outer peripheral edge of the winding core.

[0044] In this embodiment, the stop frame 100 is formed with a covering groove 101 and an outlet 102, and the collecting plate 200 is limited and accommodated in the inner cavity of the covering groove 101, wherein the collecting plate 200 includes an interconnected lead-out column 210 and a welding body 220, the lead-out column 210 is passed through the outlet 102 and is connected to the pole, and the side of the welding body 220 facing away from the lead-out column 210 is welded to the winding core, so that the collecting plate 200 plays the role of a conductive connection between the winding core and the pole; it is worth mentioning that the welding body 220 is limited and accommodated in the covering groove 101, and the inner peripheral wall of the covering groove 101 is also sleeved on the outer peripheral edge of the winding core, and the welding body 220 is welded to the winding core, thereby avoiding the problem of longitudinal and lateral shaking of the winding core, and preventing the problem of desoldering at the welding part between the collecting plate 200 and the winding core.

[0045] In this embodiment, the welding body 220 and the lead-out column 210 are limitedly accommodated in the covering groove 101, the inner peripheral wall of the covering groove 101 is used to be sleeved on the outer peripheral edge of the winding core, and the welding body 220 is welded to the winding core, thereby avoiding the problem of longitudinal and lateral shaking of the winding core, and preventing the problem of desoldering at the welding part between the collecting plate 200 and the winding core; since the inner peripheral wall of the covering groove 101 is sleeved on the outer peripheral edge of the winding core, the pole ear of the winding core is also located in the covering groove 101, so the inner peripheral wall of the covering groove 101 is used to protect the pole ear of the winding core, so as to avoid the problem of short circuit due to the pole ear touching the battery shell.

[0046] In one embodiment, see Figure 2 and Figure 3 The stop frame 100 includes a covering portion 110 and a blocking portion 120, and two openings 1201 are respectively provided at both ends of the blocking portion 120. The covering portion 110 is connected to the inner wall of one of the openings 1201, so that the blocking portion 120 and the covering portion 110 jointly form the covering groove 101, and the covering portion 110 is provided with a liquid hole 1101 and the outlet 102, and the liquid hole 1101 is connected to the covering groove 101. In this embodiment, the stop frame 100 includes a cover portion 110 and a barrier portion 120. Two openings 1201 are respectively provided at both ends of the barrier portion 120. By covering the cover portion 110 and connecting it to the inner wall of one of the openings 1201, the cover portion 110 and the barrier portion 120 jointly form a cover groove 101; and the cover portion 110 is provided with a liquid through hole 1101 and an outlet 102, and the liquid through hole 1101 and the outlet 102 are respectively connected to the cover groove 101, so that the electrolyte injected into the battery shell is injected into the winding core through the liquid through hole 1101 and the cover groove 101 in sequence.

[0047] Further, see Figure 3 , the number of the liquid-passing holes 1101 is multiple, and the multiple liquid-passing holes 1101 are evenly distributed on the cover portion 110. Thus, by providing multiple liquid-passing holes 1101 on the cover portion 110, the electrolyte injected into the battery shell enters the cover groove 101 through the multiple liquid-passing holes 1101 and is injected into the winding core, thereby accelerating the infiltration speed of the winding core, reducing the static time of the battery, and improving the production efficiency of the battery. Furthermore, the cover portion 110 and the barrier portion 120 are integrally molded. In this way, the structural strength of the stop frame 100 is improved, and the production efficiency of the stop frame 100 is improved. It will be understood that in other embodiments, the cover portion 110 and the barrier portion 120 are not limited to an integrally molded structure. For example, the cover portion 110 and the barrier portion 120 are separately molded, and the cover portion 110 is located in the opening 1201 and welded to one end of the barrier portion 120.

[0048] like Figure 2 As shown, in one embodiment, the length of the barrier portion 120 is greater than the length of the current collecting tray 200. This ensures that the covering groove 101 can be completely covered by the current collecting tray 200, and the inner peripheral wall of the covering groove 101 is sleeved on the outer periphery of the winding core, thereby isolating the tabs of the winding core from the battery case to prevent short circuit problems.

[0049] In one embodiment, see Figure 2 and Figure 3 The welding body 220 includes a connecting ring 222 and a plurality of radial welding strips 224. The outer periphery of the connecting ring 222 is connected to the inner peripheral wall of the blocking portion 120. Each of the radial welding strips 224 is connected to the inner periphery of the connecting ring 222. Each of the radial welding strips 224 is arranged at circumferential intervals along the inner periphery of the connecting ring 222, and a plurality of the radial welding strips 224 are connected to each other so that the welding body 220 is formed with a connecting portion 226, and the lead-out column 210 is connected to the connecting portion 226. In this embodiment, the radial welding strips 224 are evenly distributed along the circumference of the inner periphery of the connecting ring 222, and the plurality of radial welding strips 224 are connected to each other so that the welding body 220 is formed with a connecting portion 226, the lead-out column 210 is connected to the connecting portion 226, and then each radial welding strip 224 is connected to the inner periphery of the connecting ring 222, so that the connecting ring 222 fixes the plurality of radial welding strips 224, and the welding body 220 and the lead-out column 210 form a collecting plate 200; compared with the conventional bent collecting plate 200 In comparison, the current collecting tray 200 of the present application does not require a bending operation, which improves production efficiency, avoids the risk of fracture at the bend of the current collecting tray 200, and improves space utilization within the battery housing. Furthermore, the bending height of a conventional current collecting tray 200 increases the height of the battery itself, resulting in lower heat dissipation efficiency within the battery in the height direction. The present application eliminates the bending operation of the current collecting tray 200, which helps reduce the overall height of the battery, improves heat dissipation efficiency within the battery, and enhances battery safety. Furthermore, the outer edge of the connecting ring 222 engages the inner wall of the blocking portion 120. This allows the current collecting tray 200 to be detachably connected to the stop frame 100, facilitating quick removal and installation of both. Of course, the current collecting tray 200 is not limited to being detachably connected to the stop frame 100. For example, the current collecting tray 200 can be connected to the stop frame 100 by an interference fit or welded to the stop frame 100. Furthermore, the stop frame 100 is made of plastic. In this way, the stopper 100 is lighter, which helps to reduce the overall weight of the stopper mechanism 10 for cylindrical battery cells.

[0050] In one embodiment, see Figure 3An inner ring cavity 2221 is formed on the inner periphery of the connecting ring 222, and each of the radial welding strips 224 is connected to the inner wall of the inner ring cavity 2221, so that the inner ring cavity 2221 is divided into multiple liquid-passing intervals 2201, and every two adjacent radial welding strips 224 and the connecting ring 222 together form a liquid-passing interval 2201. In this embodiment, an inner ring cavity 2221 is formed on the inner periphery of the connecting ring 222. By connecting each radial welding strip 224 to the inner wall of the inner ring cavity 2221, the inner ring cavity 2221 is divided into a plurality of liquid-passing intervals 2201. It can be understood that after the electrolyte is injected into the battery shell, the electrolyte passes through the liquid-passing hole 1101, the inner cavity of the cover groove 101 and each liquid-passing interval 2201 in sequence, thereby infiltrating the winding core. Compared with the traditional bent collecting tray 200 which only has a few liquid seepage holes and a solid structure, the present application provides a plurality of liquid-passing intervals 2201, so that the welding body 220 is a hollow structure, thereby shortening the electrolyte entry time, accelerating the infiltration speed of the winding core, reducing the static time of the battery, and improving the production efficiency of the battery. In addition, since the welding body 220 is a hollow structure, the volume of the collecting tray 200 is reduced, the overall weight of the collecting tray 200 is reduced, and the energy density of the battery is improved.

[0051] See also Figure 4 The present application also provides a process for preparing a cylindrical battery cell stopper mechanism 10, which is used to obtain the cylindrical battery cell stopper mechanism 10 as described in any of the above embodiments. Furthermore, the process for preparing the cylindrical battery cell stopper mechanism 10 includes some or all of the following steps:

[0052] S100, forming a welding body.

[0053] In this embodiment, the welding body includes a connecting ring 222 and a plurality of radial welding strips 224. The outer periphery of the connecting ring 222 is connected to the inner peripheral wall of the blocking portion 120. Each of the radial welding strips 224 is connected to the inner periphery of the connecting ring 222. The radial welding strips 224 are spaced apart circumferentially along the inner periphery of the connecting ring 222, and the plurality of radial welding strips 224 are interconnected to form a connecting portion 226 on the welding body 220. In this embodiment, the radial welding strips 224 are evenly distributed circumferentially along the inner periphery of the connecting ring 222. The plurality of radial welding strips 224 are interconnected to form a connecting portion 226 on the welding body 220. The radial welding strips 224 are then connected to the inner periphery of the connecting ring 222, so that the connecting ring 222 secures the plurality of radial welding strips 224.

[0054] S200 , welding the lead-out column to the welding body to form a current collecting plate.

[0055] In this embodiment, the lead-out post 210 is welded to the welding body 220 so that the two together form a current collecting tray 200. Specifically, the lead-out post 210 is welded to the connecting portion 226. In this embodiment, by welding the lead-out post 210 to the connecting portion 226, the welding body 220 and the lead-out post 210 form the current collecting tray 200. Compared with the conventional bent current collecting tray 200, the current collecting tray 200 of the present application does not require a bending operation, thereby improving the production efficiency of the current collecting tray 200, avoiding the risk of fracture at the bending portion of the current collecting tray 200, and improving the space utilization rate inside the battery shell. In addition, the height of the conventional current collecting tray 200 used for bending increases the height of the battery itself, resulting in a lower heat dissipation efficiency in the height direction of the battery. However, the present application eliminates the bending operation of the current collecting tray 200, which is beneficial to reducing the overall height of the battery, making the heat dissipation efficiency inside the battery faster, and improving the safety of the battery.

[0056] S300, forming a stop frame, wherein the stop frame is formed with a cover groove and an outlet that are interconnected.

[0057] In this embodiment, the stop frame 100 includes a covering portion 110 and a blocking portion 120, and two openings 1201 are respectively provided at both ends of the blocking portion 120. The covering portion 110 is connected to the inner wall of one of the openings 1201, so that the blocking portion 120 and the covering portion 110 jointly form the covering groove 101, and the covering portion 110 is provided with a liquid hole 1101 and the outlet 102, and the liquid hole 1101 is connected to the covering groove 101. In this embodiment, the stop frame 100 includes a cover portion 110 and a barrier portion 120. Two openings 1201 are respectively provided at both ends of the barrier portion 120. By covering the cover portion 110 and connecting it to the inner wall of one of the openings 1201, the cover portion 110 and the barrier portion 120 jointly form a cover groove 101; and the cover portion 110 is provided with a liquid through hole 1101 and an outlet 102, and the liquid through hole 1101 and the outlet 102 are respectively connected to the cover groove 101, so that the electrolyte injected into the battery shell is injected into the winding core through the liquid through hole 1101 and the cover groove 101 in sequence.

[0058] S400: Assemble the collecting plate to the stop frame so that the collecting plate is positioned and accommodated in the cover groove, and pass the lead-out column through the lead-out port.

[0059] In this embodiment, when the current collecting tray 200 and the stop frame 100 are assembled, the current collecting tray 200 is limitedly accommodated in the cover groove 101 to form a stop frame mechanism 10 for the cylindrical battery cell; it can be understood that the lead-out column 210 is passed through the lead-out port 102 so that the lead-out column 210 is used to connect the pole, and the welding body 220 is located on one side of the lead-out column 210 for welding to the winding core, so that the current collecting tray 200 plays the role of a conductive connection between the winding core and the pole.

[0060] The preparation process of the stopper mechanism 10 for the cylindrical battery cell is as follows: since the lead-out column 210 is welded to the welding body 220 to form the current collecting plate 200, the stopper 100 is formed with a cover groove 101 and a lead-out port 102, the current collecting plate 200 and the stopper 100 are assembled, and the stopper 100 is used to cover the current collecting plate 200 so that the current collecting plate 200 is limited and accommodated in the cover groove 101; then the lead-out column 210 is passed through the lead-out port 102 so that the lead-out column 210 is used to connect with the pole, and the welding body 220 is used to be welded to the winding core so that the current collecting plate 200 is assembled. The disk 200 serves as a conductive connection between the winding core and the pole; it is worth mentioning that since the welding body 220 is located in the covering groove 101, when the welding body 220 is welded to the winding core, the upper end side of the winding core is also limited and accommodated in the covering groove 101, that is, the inner peripheral wall of the covering groove 101 is sleeved on the outer peripheral edge of the winding core, avoiding the longitudinal and lateral shaking of the winding core, and preventing the welding part of the collecting disk 200 and the winding core from being desoldered, and the inner peripheral wall of the covering groove 101 is also used to isolate the pole ear of the winding core from the battery shell to prevent short circuit problems.

[0061] In one embodiment, the step of welding the lead-out post to the welding body specifically includes welding the lead-out post 210 to the connecting portion 226. In this embodiment, since a plurality of radial welding bars 224 are welded together to form the connecting portion 226, the lead-out post 210 and the connecting portion 226 are welded together to assemble the lead-out post 210 and the welding body 220 into the current collecting tray 200. The lead-out post 210 is used to connect to the pole, and the welding body 220 is used to weld to the winding core. Thus, the current collecting tray 200 achieves a conductive connection between the pole and the winding core. It is worth mentioning that the present application only realizes the assembly of the collecting tray 200 by welding the lead-out column 210 and the connecting portion 226 of the welding body 220. Compared with the traditional bent collecting tray 200, the collecting tray 200 of the present application has a simpler structure and a simpler production process, which is convenient for improving the production efficiency of the collecting tray 200; the collecting tray 200 of the present application does not need to be bent, which can avoid the risk of breakage at the bending point of the collecting tray 200 and improve the space utilization rate inside the battery shell; since the present application cancels the bending operation of the collecting tray 200, it is beneficial to reduce the overall height of the battery, so that the heat dissipation efficiency inside the battery is faster, and the safety of battery use is improved.

[0062] In one embodiment, the welding body 220 includes a connecting ring 222 and a plurality of radial welding strips 224; the steps of forming the welding body 220 include: placing the plurality of radial welding strips 224 on a collecting plate welding jig; using a welder to weld the plurality of radial welding strips 224 together to form a connecting portion 226; placing the plurality of radial welding strips 224 in the inner ring cavity 2221 of the connecting ring 222, and welding each of the radial welding strips 224 to the inner wall of the inner ring cavity 2221 to form the welding body 220. In this embodiment, a collecting plate welding jig is used to carry multiple radial welding rods 224, and then a welder is used to weld the multiple radial welding rods 224 together. A connecting portion 226 is formed at the connection of the multiple radial welding rods 224, and the connecting ring 222 forms an inner ring cavity 2221. The multiple radial welding rods 224 welded together are placed in the inner ring cavity 2221. By welding each radial welding rod 224 to the inner wall of the inner ring cavity 2221, the connecting ring 222 firmly connects the multiple radial welding rods 224. The connecting ring 222 also forms a welding body 220 together with the multiple radial welding rods 224.

[0063] Furthermore, the step of welding the plurality of radial welding rods 224 together is specifically as follows: first, one end of the plurality of radial welding rods 224 is abutted and positioned at the same center; then, the abutting portions of the plurality of radial welding rods 224 are sequentially welded. In this embodiment, after one end of the plurality of radial welding rods 224 is abutted against each other at the same center, the plurality of radial welding rods 224 are sequentially welded, so that the plurality of radial welding rods 224 are formed into a single body, and a connecting portion 226 is formed at the connection of the plurality of radial welding rods 224.

[0064] In one embodiment, the number of radial welding rods 224 is m, where m = 2n, and n is an integer greater than or equal to 1. The m radial welding rods 224 are centrally symmetrically arranged about the connection portion 226. Because the m radial welding rods 224 are symmetrically arranged about the connection portion 226, two radial welding rods 224 symmetrically distributed about the connection portion 226 are located on the same straight line. Therefore, the welder can weld the two radial welding rods 224 located on the same straight line using a straight welding trajectory, thereby improving the welding efficiency of the multiple radial welding rods 224, improving the production efficiency of the welded body 220, and reducing the problem of poor welding when the multiple radial welding rods 224 are welded to each other. It can be understood that when the m radial welding rods 224 are welded to the inner wall of the connecting ring 222 to form the welded body 220, the symmetrical arrangement of the m radial welding rods 224 about the connection portion 226 makes the welded body 220 more aesthetically pleasing.

[0065] In one embodiment, the step of welding each radial welding strip 224 to the inner wall of the inner ring cavity 2221 is specifically as follows: welding each radial welding strip 224 to the inner wall of the inner ring cavity 2221 in sequence along the circumference of the connecting ring 222. In this embodiment, by welding each radial welding strip 224 to the inner wall of the inner ring cavity 2221 in sequence along the circumference of the connecting ring 222, the connecting ring 222 securely connects the plurality of radial welding strips 224, and the connecting ring 222 and the plurality of radial welding strips 224 form a welded body 220.

[0066] Furthermore, the step of welding each of the radial welding strips 224 to the inner wall of the inner ring cavity 2221 in sequence along the circumference of the connecting ring 222 is specifically as follows: first, spot-weld each of the radial welding strips 224 to the inner wall of the inner ring cavity 2221 at intervals, and then weld each of the radial welding strips 224 to the inner wall of the inner ring cavity 2221 for a second time in sequence along the circumference of the connecting ring 222. In this embodiment, each radial welding strip 224 is first spot-welded to the inner wall of the inner ring cavity 2221, so that each radial welding strip 224 and the inner wall of the inner ring cavity 2221 are relatively pre-fixed, and then each radial welding strip 224 and the inner wall of the inner ring cavity 2221 are welded and fixed for a second time. In this way, the welding accuracy and welding efficiency between each radial welding strip 224 and the inner wall of the inner ring cavity 2221 are improved, and the connection firmness between the connecting ring 222 and the multiple radial welding strips 224 is also improved, even if the multiple radial welding strips 224 are reliably fixed to the connecting ring 222.

[0067] In one embodiment, the welding peak power of the welder is 4.4 kW to 4.8 kW. In one embodiment, the output energy of the welder is 43 J to 48 J. In one embodiment, the pulse width of the welder is 9 to 11 ms. In one embodiment, the output power of the welder is 360 to 363 W. In this embodiment, the various output parameters of the welder are set to produce a weld body 220 of the desired thickness. For example, the weld body 220 is a positive-electrode aluminum weld body with a thickness of 0.45 to 0.55 mm. In another example, the weld body 220 is a negative-electrode copper-plated nickel weld body with a thickness of 0.25 to 0.35 mm. It should be noted that the various output parameters of the welder can be appropriately adjusted based on the actual weld body 220 and thickness requirements. Furthermore, the welding speed of the welder is 4.5 mm / s to 5.5 mm / s. In one embodiment, the idling speed of the welder is 18 mm / s to 22 mm / s. In one embodiment, the light emission time of the welding device is 7400ms to 7500ms.

[0068] In one embodiment, the stop frame 100 includes a cover portion 110 and a barrier portion 120; the step of forming the stop frame 100 includes: connecting the cover portion 110 to one end of the barrier portion 120 to form the cover groove 101. In this embodiment, by connecting the cover portion 110 to one end of the barrier portion 120 to form the cover groove 101, the cover groove 101 is used to limit and accommodate the current collecting tray 200, so that the welding body 220 is limited within the cover groove 101. When the welding body 220 is welded to the winding core, the inner peripheral wall of the cover groove 101 is used to fit over the outer peripheral edge of the winding core, thereby preventing longitudinal and lateral shaking of the winding core and preventing desoldering at the welding point between the current collecting tray 200 and the winding core. It can be understood that the stop frame 100 is composed of a cover portion 110 and a barrier portion 120. By connecting the cover portion 110 and the barrier portion 120, the structure of the stop frame 100 is relatively simple, the production efficiency of the stop frame 100 is improved, and mass production is facilitated.

[0069] In one embodiment, after the step of attaching the cover portion 110 to one end of the barrier portion 120, the manufacturing process of the cylindrical battery cell retaining frame mechanism 10 further includes: machining a liquid passage hole 1101 and the outlet 102 on the cover portion 110. In this embodiment, by machining the liquid passage hole 1101 and the outlet 102 on the cover portion 110, it can be understood that the liquid passage hole 1101 and the outlet 102 are both connected to the cover groove 101. Therefore, the lead-out post 210, which is limitedly accommodated in the cover groove 101, can be extended through the outlet 102 to allow the lead-out post 210 to be connected to the electrode. In addition, the welding body 220 is used for welding the winding core, so the upper end of the winding core is also located in the cover groove 101. By machining the liquid passage hole 1101 on the cover portion 110, the electrolyte enters the cover groove 101 through the liquid passage hole 1101 to infiltrate the winding core.

[0070] Furthermore, the plurality of radial welding strips 224 divide the inner annular cavity 2221 into a plurality of liquid-passing zones 2201, each of which is in communication with the cover groove 101. In this embodiment, the plurality of radial welding strips 224 divide the inner annular cavity 2221 into a plurality of liquid-passing zones 2201, each of which is in communication with the cover groove 101, which in turn is in communication with the liquid-passing hole 1101. Thus, after the electrolyte is injected into the battery case, the electrolyte is sequentially injected into the winding core through the liquid-passing hole 1101, the cover groove 101, and the plurality of liquid-passing zones 2201. Due to the provision of the plurality of liquid-passing zones 2201, the welding body 220 has a hollow structure, thereby shortening the electrolyte entry time, accelerating the winding core's infiltration speed, reducing the battery's static time, and improving the battery's production efficiency. It can also be understood that by providing multiple liquid-passing intervals 2201 , the welded body 220 is made into a hollow structure, which results in a smaller volume of the collecting tray 200 , reduces the overall weight of the collecting tray 200 , and thereby improves the energy density of the battery.

[0071] Compared with the prior art, the present invention includes but is not limited to the following advantages:

[0072] 1. By limiting the position of the welding body 220 and the lead-out column 210 in the cover groove 101, using the inner peripheral wall of the cover groove 101 to cover the outer peripheral edge of the winding core, and welding the welding body 220 to the winding core, the longitudinal and lateral shaking of the winding core in the battery shell is avoided, and the welding part between the current collecting plate 200 and the winding core is prevented from being desoldered;

[0073] 2. Since the inner peripheral wall of the covering groove 101 is sleeved on the outer peripheral edge of the winding core, the pole ear of the winding core is also located in the covering groove 101. Therefore, the inner peripheral wall of the covering groove 101 can protect the pole ear of the winding core to avoid the problem of short circuit caused by the pole ear touching the battery shell.

[0074] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A stopper mechanism for cylindrical battery cells, characterized in that: include: The stop frame is formed with a cover groove and an outlet that are interconnected; A current collecting plate, the current collecting plate being limitedly accommodated in the inner cavity of the cover groove, the current collecting plate comprising an interconnected lead-out post and a welding body, the lead-out post being passed through the lead-out port so as to be connected to the pole, and the side of the welding body facing away from the lead-out post being used for welding to the winding core so that the inner peripheral wall of the cover groove is sleeved on the outer peripheral edge of the winding core; The stop frame includes a cover portion and a barrier portion, wherein two openings are respectively provided at both ends of the barrier portion, and the cover portion is connected to the inner wall of one of the openings so that the barrier portion and the cover portion jointly form the cover groove, and the cover portion is provided with a liquid passage hole and the outlet, and the liquid passage hole is communicated with the cover groove; The welding body includes a connecting ring and a plurality of radial welding strips. The outer periphery of the connecting ring is connected to the inner peripheral wall of the barrier portion. Each of the radial welding strips is connected to the inner periphery of the connecting ring. Each of the radial welding strips is arranged at circumferential intervals along the inner periphery of the connecting ring, and the plurality of radial welding strips are connected to each other so that a connecting portion is formed on the welding body, and the lead-out column is connected to the connecting portion. There are a plurality of liquid holes, and the plurality of liquid holes are evenly distributed on the cover portion.

2. The cylindrical battery cell retaining frame mechanism according to claim 1, characterized in that: The covering portion and the blocking portion are an integrally formed structure.

3. The cylindrical battery cell retaining frame mechanism according to claim 2, characterized in that: The length of the blocking portion is greater than the length of the collecting plate.

4. The cylindrical battery cell stopper mechanism according to claim 3, characterized in that: An inner ring cavity is formed on the inner periphery of the connecting ring, and each of the radial welding strips is connected to the inner wall of the inner ring cavity, so that the inner ring cavity is divided into multiple liquid-passing intervals, and every two adjacent radial welding strips and the connecting ring together form a liquid-passing interval.

5. A process for preparing a cylindrical battery cell stopper mechanism, for obtaining the cylindrical battery cell stopper mechanism according to claim 4, the process comprising the following steps: Forming a welding body; Welding the lead-out column to the welding body to form a current collecting plate; A stop frame is formed, wherein the stop frame is formed with a cover groove and an outlet that are interconnected; The collecting plate is assembled on the stop frame so that the collecting plate is limitedly accommodated in the cover groove, and the lead-out column is passed through the lead-out port.

6. The process for preparing the retaining frame mechanism for a cylindrical battery cell according to claim 5, wherein the step of welding the lead-out column to the welding body is specifically as follows: The lead-out column is welded to the connecting portion.

7. The process for preparing the retaining frame mechanism for a cylindrical battery cell according to claim 5, wherein the step of forming the welding body comprises: placing a plurality of the radial welding bars on a current collecting plate welding jig; Using a welder to weld the plurality of radial welding strips together to form a connecting portion; placing a plurality of radial welding rods in the inner ring cavity of the connecting ring; Each of the radial welding strips is welded to the inner wall of the inner ring cavity to form the welding body.

8. The process for preparing a stopper mechanism for a cylindrical battery cell according to claim 7, wherein the welding peak power of the welder is 4.4KW to 4.8KW.

9. The process for preparing a stopper mechanism for a cylindrical battery cell according to claim 5, wherein the step of forming the stopper comprises: The covering portion is connected to one end of the blocking portion to form the covering groove together.

10. The process for preparing the stopper mechanism for cylindrical battery cells according to claim 9, further comprising, after the step of connecting the covering portion to one end of the blocking portion: A liquid hole and the outlet are processed on the cover portion.

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