Battery disassembling device

Abstract

The utility model discloses a battery disassembling device, and relates to the technical field of battery manufacturing. The battery disassembling device comprises a vertical frame, a base, a cutter assembly and a fixing assembly, the vertical frame is erected on the base, and a mounting interval is formed between the vertical frame and the base; the cutter assembly is installed on the vertical frame and comprises a cutter, and at least one part of the cutter is located in the installation interval; the fixing assembly is located on the base and used for fixing the cylindrical battery, and at least one part of the fixing assembly is located in the mounting interval; wherein at least one of the cutter and the fixing assembly can move in a reciprocating mode in the first direction and the second direction, the first direction is parallel to the radial direction of the cylindrical battery fixed by the fixing assembly, and the second direction is parallel to the axial direction of the cylindrical battery fixed by the fixing assembly. According to the battery disassembling device disclosed by the invention, the safety of battery disassembling can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a battery disassembly device. Background Art

[0002] In the research, development, and manufacturing process of lithium-ion cylindrical batteries, battery disassembly is a very common research and analysis method.

[0003] Most related technologies use manual disassembly methods. Researchers hold the battery in their hands and use pipe clamps and cutters to cut the battery at the seal of the positive terminal of the battery. Then they peel off the positive terminal, cut off the positive terminal ear, and then use vise-jaw pliers to peel off the negative terminal of the battery (all battery shells except the positive terminal are negative terminals) to obtain the core inside the battery.

[0004] However, manual disassembly of batteries poses great safety risks, especially when cutting the positive end. Since it is impossible to observe the internal situation of the battery, if the cutter is too deep or tilted, it is easy to cause a short circuit between the positive and negative poles inside the battery, which may cause the battery to catch fire or even explode. Utility Model Content

[0005] In view of this, the present application provides a battery disassembly device that can improve the disassembly safety of cylindrical batteries.

[0006] This application specifically adopts the following technical solutions:

[0007] The embodiment of the present application discloses a battery disassembly device, which includes a stand, a base, a tool assembly, and a fixing assembly;

[0008] The stand is mounted on the base, and an installation gap is formed between the stand and the base;

[0009] The knife assembly is mounted on the stand, the knife assembly includes a cutter, and at least a portion of the cutter is located in the mounting space;

[0010] The fixing assembly is located on the base and is used to fix the cylindrical battery, and at least a portion of the fixing assembly is located in the mounting space;

[0011] In which, at least one of the cutter and the fixing assembly can reciprocate along the first direction and / or the second direction respectively, the first direction is parallel to the radial direction of the cylindrical battery fixed by the fixing assembly, and the second direction is parallel to the axial direction of the cylindrical battery fixed by the fixing assembly.

[0012] Optionally, the tool assembly is fixedly connected to the stand, and the stand can reciprocate along the first direction and / or the second direction relative to the base.

[0013] Optionally, the stand comprises a suspension rod and two support rods, the two support rods are respectively placed on the base and spaced apart from each other, the suspension rod connects ends of the two support rods away from the base, and the tool assembly is mounted on the suspension rod;

[0014] The device includes at least one of a translation assembly and a telescopic assembly, wherein the translation assembly can provide displacement parallel to the first direction, and the two support rods are respectively connected to the base through the translation assembly; the telescopic assembly can provide displacement parallel to the second direction, and the two support rods respectively have the telescopic assembly.

[0015] Optionally, the translation assembly includes a slide rail, a sliding portion and a stop portion;

[0016] The sliding portion is slidably mounted on the slide rail, and the support rod and the base are connected to one of the slide rail and the sliding portion respectively;

[0017] The stop portion is connected to at least one of the sliding portion and the slide rail portion to prevent the sliding portion from sliding on the slide rail.

[0018] Optionally, a first positioning hole is provided on a surface of the slide rail facing the sliding portion, and the first positioning hole is located on a sliding path of the sliding portion;

[0019] The stop portion is detachably mounted on the first positioning hole and can abut against the sliding portion along the first direction.

[0020] Optionally, a mounting hole and an annular limiting groove are provided on a surface of the suspension rod facing the mounting space, and the annular limiting groove surrounds the outer side of the mounting hole;

[0021] The tool assembly includes a drive motor, a connecting piece and a cutter shaft. The drive motor is installed in the mounting hole, and the axis of the output shaft of the drive motor coincides with the central axis of the mounting hole; the two ends of the connecting piece are respectively connected to the output shaft of the drive motor and the cutter shaft; one end of the cutter shaft is located in the annular limiting groove, and the other end is vertically connected to the cutter, and the axis of the cutter shaft is parallel to the axis of the output shaft of the drive motor.

[0022] Optionally, the device includes a lifting component, the lifting component is placed on the base, the fixing component is placed on a side of the lifting component away from the base, and the lifting component can drive the fixing component to move parallel to the second direction.

[0023] Optionally, the lifting assembly includes a bottom plate, a top plate, a lead screw assembly and at least two four-bar linkage components, the lead screw assembly and the at least two four-bar linkage components are located between the bottom plate and the top plate, and the at least two four-bar linkage components are arranged in pairs and symmetrically distributed on opposite sides of the lead screw assembly;

[0024] The lead screw assembly has at least two first movable connection ends and at least two second movable connection ends, and the at least two first movable connection ends and the at least two second movable connection ends can move toward each other or away from each other;

[0025] Each of the four-link components includes a first hinge end, a second hinge end, a third hinge end and a fourth hinge end arranged in sequence, wherein the first hinge end and the third hinge end are respectively connected to the first movable connection end and the second movable connection end, and the second hinge end and the fourth hinge end are respectively connected to the bottom plate and the top plate.

[0026] Optionally, the screw assembly includes a first connecting rod, a second connecting rod and a screw rod;

[0027] The first connecting rod has two first movable connecting ends, and the first connecting rod is further provided with a first threaded hole, and the first threaded hole is located between the two first movable connecting ends;

[0028] The second connecting rod has two second movable connecting ends, and the second connecting rod is further provided with a second threaded hole, the second threaded hole is located between the two second movable connecting ends, and the thread rotation direction of the second threaded hole is opposite to the thread rotation direction of the first threaded hole;

[0029] A bidirectional thread is provided on the outer wall of the screw rod. The screw rod passes through the first threaded hole and the second threaded hole, and is threadably engaged with the first threaded hole and the second threaded hole respectively through the bidirectional thread.

[0030] Optionally, the four-bar linkage members are in two pairs, the first connecting rods and the second connecting rods are both in two pairs, the two first movable connecting ends of each first connecting rod are respectively connected to the first hinged ends of the two paired four-bar linkage members, and the two second movable connecting ends of each second connecting rod are respectively connected to the third hinged ends of the two paired four-bar linkage members;

[0031] The screw assembly further includes at least one first connecting shaft, at least one second connecting shaft, a first limit block and a second limit block, wherein the first limit block is provided with a first through hole, and the second limit block is provided with a second through hole, and the apertures of the first through hole and the second through hole are both larger than the rod diameter of the screw rod;

[0032] The screw rod sequentially passes through a first threaded hole on the first connecting rod, a first through hole on the first limiting block, a second threaded hole on the second connecting rod, a second through hole on the second limiting block, and a first threaded hole on another first connecting rod, and a gap is formed between at least one of the first limiting block and the second limiting block and the adjacent first connecting rod and / or second connecting rod;

[0033] Another second connecting rod is located on a side of the other first connecting rod away from the second limiting block;

[0034] The two first connecting rods are connected via the at least one first connecting shaft, and the two second connecting rods are connected via the at least one second connecting shaft.

[0035] Optionally, a first avoidance groove is provided on the surface of the bottom plate facing the top plate, and at least a portion of the second hinged end of the four-bar link member is located in the first avoidance groove; and / or,

[0036] A second avoidance groove is provided on the surface of the top plate facing the bottom plate, and at least a portion of the fourth hinged end of the four-bar link member is located in the second avoidance groove.

[0037] Optionally, the fixing assembly includes a fixing seat, a fixing frame, a positioning sleeve and at least two ejector rods;

[0038] The fixing frame and the positioning sleeve are connected to the fixing seat, and the positioning sleeve is located on the inner side of the fixing frame;

[0039] The at least two push rods are respectively mounted on two opposite side frame walls of the fixed frame and can move closer to or away from each other relative to the fixed frame.

[0040] Optionally, the inner side wall of the positioning sleeve is stepped, including a first annular surface, a step surface and a second annular surface connected in sequence, the first annular surface is located on the side of the second annular surface away from the fixing seat, and the diameter of the first annular surface is larger than the diameter of the second annular surface.

[0041] The battery disassembly device provided in the embodiment of the present application fixes the cylindrical battery by means of a fixing assembly placed on the base, so that the cylindrical battery is kept in an upright position with the positive terminal at the top and the negative terminal at the bottom; a stand is mounted on the base, and a tool assembly is mounted on the stand, and a cutter is suspended in the air for cutting the positive terminal seal of the cylindrical battery. After the cylindrical battery is fixed to the fixing assembly, at least one of the cutter and the fixing assembly can be driven to move along the axial and radial directions of the cylindrical battery, thereby adjusting the relative position between the cutter and the positive terminal seal of the cylindrical battery to ensure accurate cutting of the positive terminal seal. Therefore, the battery disassembly device provided in the embodiment of the present application can accurately position the relative position of the cutter and the cylindrical battery, avoid operational risks caused by the cutter being too deep or tilted when disassembling the cylindrical battery, and improve the safety of battery disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 This is a schematic diagram of a usage scenario of a battery disassembly device provided in an embodiment of the present application;

[0044] Figure 2 This is a schematic structural diagram of a battery disassembly device provided in an embodiment of the present application;

[0045] Figure 3 This is a schematic diagram of the assembly structure of a stand and a base provided in an embodiment of the present application;

[0046] Figure 4 This is a structural diagram of a lifting assembly provided in an embodiment of the present application;

[0047] Figure 5 This is a schematic structural diagram of a lead screw assembly provided in an embodiment of the present application;

[0048] Figure 6 It is a structural schematic diagram of a fixing component provided in an embodiment of the present application.

[0049] Reference numerals:

[0050] 00, cylindrical battery;

[0051] 10. Stand; 11. Installation spacer; 12. Suspension rod; 121. Installation hole; 122. Annular limit groove; 13. Support rod;

[0052] 20. Base;

[0053] 30. Cutter assembly; 31. Cutter; 32. Drive motor; 33. Connector; 34. Cutter shaft;

[0054] 40. Fixing assembly; 41. Fixing seat; 42. Fixing frame; 43. Positioning sleeve; 431. First annular surface; 432. Step surface; 433. Second annular surface; 44. Ejector rod;

[0055] 50. Translation assembly; 51. Slide rail; 511. First positioning hole; 52. Sliding portion; 53. Stop portion;

[0056] 60. Telescopic assembly; 61. Sleeve portion; 62. Rod portion;

[0057] 70. Lifting assembly; 71. Bottom plate; 711. First avoidance groove; 72. Top plate; 721. Second avoidance groove; 73. Screw assembly; 731. First connecting rod; 7311. First movable connecting end; 7312. First threaded hole; 7313. Fourth through hole; 732. Second connecting rod; 7321. Second movable connecting end; 7322. Second threaded hole; 7323. Third through hole; 733. Screw; 734. First connecting shaft; 735. Second connecting shaft; 736. First limit block; 7361. First through hole; 737. Second limit block; 7371. Second through hole; 738. Operating handle; 74. Four-bar linkage; 741. First hinged end; 742. Second hinged end; 743. Third hinged end; 744. Fourth hinged end. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0060] The present application provides a battery disassembly device, such as Figure 1As shown, the battery disassembly device includes a stand 10, a base 20, a cutter assembly 30, and a fixing assembly 40. The stand 10 is mounted on the base 20, and a mounting gap 11 is formed between the stand 10 and the base 20; the cutter assembly 30 is mounted on the stand 10 and includes a cutter 31, at least a portion of which is located within the mounting gap 11; the fixing assembly 40 is located on the base 20 and is used to fix the cylindrical battery 00, with at least a portion of the fixing assembly 40 located within the mounting gap 11.

[0061] Among them, at least one of the cutter 31 and the fixing assembly 40 can reciprocate along the first direction and / or the second direction respectively, the first direction is parallel to the radial direction of the cylindrical battery 00 fixed by the fixing assembly 40, and the second direction is parallel to the axial direction of the cylindrical battery 00 fixed by the fixing assembly 40.

[0062] The battery disassembly device provided in the embodiment of the present application fixes the cylindrical battery 00 by means of a fixing assembly 40 placed on the base 20, so that the cylindrical battery 00 is maintained in an upright position with the positive terminal at the top and the negative terminal at the bottom; a stand 10 is mounted on the base 20, and a tool assembly 30 is mounted on the stand 10, with a cutter 31 suspended in the air for cutting the positive terminal seal of the cylindrical battery 00. After the cylindrical battery 00 is fixed to the fixing assembly 40, at least one of the cutter 31 and the fixing assembly 40 can be driven to move along the axial and radial directions of the cylindrical battery 00, thereby adjusting the relative position between the cutter 31 and the positive terminal seal of the cylindrical battery 00 to ensure accurate cutting of the positive terminal seal. Therefore, the cylindrical battery 00 disassembly device provided in the embodiment of the present application can accurately position the relative position of the cutter 31 and the cylindrical battery 00, avoiding the operational risks caused by the cutter 31 being too deep or tilted when disassembling the cylindrical battery 00, thereby improving the safety of battery disassembly.

[0063] In order to make the technical solutions and advantages of this application clearer, Figure 1-6 , further introduces and illustrates a battery disassembly device provided in an embodiment of the present application.

[0064] Figure 1 The following shows a usage scenario of a battery disassembly device provided in an embodiment of the present application. Figure 1 As shown, a fixing assembly 40 is placed or connected to the base 20, and the cylindrical battery 00 to be disassembled is installed and fixed by the fixing assembly 40. The cylindrical battery 00 is in an upright state, with the positive terminal to be cut exposed, and the fixing assembly 40 contacts the portion of the cylindrical battery 00 except the positive terminal to achieve a fixing effect.

[0065] A stand 10 is also mounted on the base 20, a portion of which is located above the fixing assembly 40 and the cylindrical battery 00 (with Figure 1Taking the orientation shown as an example), a tool assembly 30 is installed on the stand 10, and the position of the cutter 31 in the tool assembly 30 is close to the position of the cylindrical battery 00 so as to cut the positive end seal of the cylindrical battery 00.

[0066] For the battery disassembly device provided in the embodiment of the present application, the rotation axis of the cutter 31 should coincide with the central axis of the cylindrical battery 00 to ensure that the cutting depth of the positive terminal seal of the cylindrical battery 00 by the cutter 31 is uniform in the circumferential direction of the cylindrical battery 00. Therefore, in the embodiment of the present application, at least one of the cutter 31 and the fixing assembly 40 can move back and forth along the first direction, and at least one of the cutter 31 and the fixing assembly 40 can move back and forth along the second direction, that is, the cutter 31 and the cylindrical battery 00 can be adjusted in position in the first direction and the second direction respectively, to avoid the cutter 31 from cutting the cylindrical battery 00 too deeply. The first direction is parallel to the radial direction of the cylindrical battery 00. Figure 1 The second direction is parallel to the axial direction of the cylindrical battery 00. Figure 1 It is represented by y.

[0067] In some embodiments of the present application, Figure 1 As shown, the tool assembly 30 and the stand 10 are fixedly connected, and the stand 10 and the base 20 are movably connected. The stand 10 can move back and forth in the first direction and / or the second direction relative to the base 20, thereby achieving position adjustment of the tool assembly 30.

[0068] Generally speaking, for two parts that are movably connected, there is usually a certain amount of clearance between the movable mating surfaces of the two parts. This clearance is used to reduce the resistance when the two parts move relative to each other and ensure the margin of movement. However, for the tool assembly 30, cutting the cylindrical battery 00 is a delicate operation. The existence of margin will affect the cutting accuracy of the tool assembly 30 and easily lead to adverse consequences. Therefore, in the embodiment of the present application, the tool assembly 30 is installed on the stand 10 in a fixed connection, thereby ensuring the operating accuracy of the tool assembly 30; at the same time, in order to achieve the position adjustment of the tool assembly 30, the stand 10 is movably connected to the base 20.

[0069] In one example, if Figure 1 As shown, the stand 10 and the base 20 can move relative to each other in a first direction. In another example, the stand 10 and the base 20 can move relative to each other in a second direction. In yet another example, Figure 2 As shown, the stand 10 and the base 20 can move relative to each other in a first direction and can move relative to each other in a second direction.

[0070] In some embodiments of the present application, Figure 2As shown, the stand 10 includes a hanger 12 and two support rods 13, and the two support rods 13 are respectively placed on the base 20 and spaced apart from each other; the hanger 12 connects the two support rods 13 at one end away from the base 20, the tool assembly 30 is installed on the hanger 12, and the fixing assembly 40 and the cylindrical battery 00 are located between the hanger 12 and the base 20.

[0071] The tool assembly 30 is fixed on the boom 12 as follows: Figure 3 See Figure 3 The surface of the boom 12 facing the mounting spacer 11 is provided with a mounting hole 121 and an annular limiting groove 122. The annular limiting groove 122 surrounds the outside of the mounting hole 121, and the central axis of the annular limiting groove 122 coincides with the central axis of the mounting hole 121. The cutter assembly 30 includes a drive motor 32, a connector 33, and a cutter shaft 34. The drive motor 32 is mounted in the mounting hole 121, and the axis of the output shaft of the drive motor 32 coincides with the central axis of the mounting hole 121. The two ends of the connector 33 are respectively connected to the output shaft of the drive motor 32 and the cutter shaft 34. One end of the cutter shaft 34 is located in the annular limiting groove 122, and the other end is vertically connected to the cutter 31. The axis of the cutter shaft 34 is parallel to the axis of the output shaft of the drive motor 32.

[0072] It should be noted that the cutter 31 is circular in shape, one end of the cutter shaft 34 is connected to the center of the cutter 31, and the other end of the cutter shaft 34 is located in the annular limiting groove 122. The cutter shaft 34 is fixedly connected to the output shaft of the drive motor 32 via a connecting member 33. The connecting member 33 can be, for example, a double-hole connecting rod, and the cutter shaft 34 and the output shaft of the drive motor 32 respectively pass through the two through holes of the double-hole connecting rod and are fixedly connected to the double-hole connecting rod.

[0073] During use, the output shaft of the drive motor 32 drives the connecting member 33 to rotate about the central axis of the mounting hole 121. As a result, the cutter shaft 34, which is fixedly connected to the connecting member 33, is driven by the connecting member 33 to rotate about the central axis of the mounting hole 121. Because the central axis of the annular limiting groove 122 coincides with the central axis of the mounting hole 121, the end of the cutter shaft 34 away from the cutter 31 rotates within the annular limiting groove 122. In other words, the groove wall of the annular limiting groove 122 constrains the position of the cutter shaft 34 and prevents it from tilting.

[0074] Therefore, by fixing the tool assembly 30 in the above manner, the rotation axis of the cutter 31 can be easily determined, facilitating the positioning of the cutter 31 relative to the cylindrical battery 00. Furthermore, since the groove wall of the annular limiting groove 122 can limit the position of the cutter shaft 34 during the rotation of the cutter 31, the axis of the cutter shaft 34 is ensured to be always parallel to the rotation axis of the cutter 31 and will not tilt. This avoids the problem of inconsistent cutting depth of the cylindrical battery 00 caused by the skewness of the cutter 31, further improving the safety of disassembling the cylindrical battery 00.

[0075] Optionally, the battery disassembly device may further include a translation assembly 50, which can provide displacement parallel to the first direction. The two support rods 13 are respectively connected to the base 20 through the translation assembly 50, thereby realizing relative movement of the stand 10 and the base 20 in the first direction.

[0076] For example, Figure 2 As shown, the translation assembly 50 includes a slide rail 51, a sliding portion 52, and a stop portion 53. The sliding portion 52 is slidably mounted on the slide rail 51, and the support rod 13 and the base 20 are connected to one of the slide rail 51 and the sliding portion 52 respectively; the stop portion 53 is connected to at least one of the slide portion 52 and the slide rail 51 to prevent the slide portion 52 from sliding on the slide rail 51.

[0077] It should be noted that the support rod 13 and the base 20 are connected to one of the slide rail 51 and the sliding portion 52 respectively. It is possible that the support rod 13 is connected to the slide rail 51 and the base 20 is connected to the sliding portion 52; it is also possible that the support rod 13 is connected to the sliding portion 52 and the base 20 is connected to the slide rail 51. Figure 2 In the embodiment, two slide rails 51 are connected to the base 20 , and there is a gap between the two slide rails 51 . The two support rods 13 are respectively connected to the two sliding parts 52 , and the two sliding parts 52 are respectively slidably matched with the two slide rails 51 .

[0078] Optionally, at least one support rod 13 and at least a portion of the sliding portion 52 connected thereto are an integrally formed structure.

[0079] The stopper 53 is used to lock the sliding portion 52 to the slide rail 51. Typically, after the relative positions of the cutter 31 and the cylindrical battery 00 in the first direction are adjusted, the stopper 53 is used to lock the sliding portion 52. Optionally, a first positioning hole 511 is provided on the surface of the slide rail 51 facing the sliding portion 52. The first positioning hole 511 is located in the sliding path of the sliding portion 52. The stopper 53 is removably mounted in the first positioning hole 511 and can abut against the sliding portion 52 in the first direction, thereby preventing the sliding portion 52 from continuing to slide in the first direction.

[0080] In one example, see Figure 2A plurality of first positioning holes 511 are provided on the surface of the slide rail 51 facing the sliding part 52, and the plurality of first positioning holes 511 are arranged along the first direction; the stop part 53 is a block, a part of which can be inserted into the first positioning hole 511, and the part of the block located outside the first positioning hole 511 can be against the sliding part 52 to prevent the sliding of the sliding part 52.

[0081] During use, after the position of the cutter 31 is adjusted, the two blocks are respectively inserted into the first positioning holes 511 on both sides of the stand 10 that are closest to the two sliding parts 52. At this time, the parts of the two blocks outside the first positioning holes 511 will respectively resist the two sliding parts 52 in the first direction, so that the stand 10 will be limited between the two blocks, and the position of the cutter 31 relative to the cylindrical battery 00 will be fixed.

[0082] In another example, a plurality of first positioning holes 511 are provided on the surface of the slide rail 51 facing the sliding portion 52, and the plurality of first positioning holes 511 are arranged along a first direction; each sliding portion 52 is provided with a second positioning hole, which can communicate with each of the plurality of first positioning holes 511. The stopper 53 is, for example, a fastener such as a bolt, and a portion of the stopper 53 can pass through the second positioning hole and be inserted into the first positioning hole 511. The portion of the stopper 53 located within the second positioning hole can abut against the sliding portion 52 in the first direction to prevent the sliding portion 52 from sliding.

[0083] During use, after the position of the cutter 31 is adjusted, the two stop parts 53 are respectively inserted into the first positioning hole 511 and the second positioning hole connected on both sides of the stand 10. At this time, on the one hand, the two fasteners can fasten the sliding part 52 and the slide rail 51, and on the other hand, the parts of the two stop parts 53 located in the second positioning hole will respectively resist the two sliding parts 52 in the first direction, so that the position of the stand 10 is fixed, and then the position of the cutter 31 relative to the cylindrical battery 00 is fixed.

[0084] This embodiment utilizes a sliding engagement mechanism to enable relative movement between the stand 10 and the base 20 in a first direction, thereby adjusting the position of the cutter 31 relative to the cylindrical battery 00 in the first direction. Subsequently, a simple engagement mechanism is employed by the stopper 53 to lock the position of the slide 52 and the rail 51. Compared to other types of translational assemblies 50, the sliding engagement mechanism and stopper 53 offer advantages such as simple structure, low cost, good stability, and ease of assembly and operation.

[0085] Alternatively, as Figure 2 As shown, the battery disassembly device further includes a telescopic assembly 60 , which can provide displacement parallel to the second direction. The two support rods 13 each have a telescopic assembly 60 .

[0086] For example, see Figure 2 The telescopic assembly 60 includes a sleeve portion 61 and a rod portion 62. The sleeve portion 61 has an inner cavity (not shown in the figure), and at least a portion of the rod portion 62 can be retracted into the inner cavity of the sleeve portion 61. Each support rod 13 includes a first part and a second part that are independent of each other, and the first part and the second part are respectively connected to the sleeve portion 61 and the rod portion 62. By adjusting the extension and retraction amount of the rod portion 62 in the inner cavity of the sleeve portion 61, the position of the cutter 31 relative to the cylindrical battery 00 in the second direction can be adjusted. Compared with other types of translation assemblies 50, the telescopic assembly 60 has the advantages of simple structure, good reliability, and easy assembly and operation.

[0087] In some embodiments of the present application, the fixing assembly 40 and the base 20 may also be relatively positioned in the first direction and / or the second direction, thereby achieving position adjustment.

[0088] In one example, when the fixing assembly 40 is placed on the base 20 , the placement position of the fixing assembly 40 on the base 20 can be directly adjusted manually.

[0089] In another example, Figure 1 As shown, the battery disassembly device may further include a lifting assembly 70 , which is placed on the base 20 , and the fixing assembly 40 is placed on a side of the lifting assembly 70 away from the base 20 , and the lifting assembly 70 can drive the fixing assembly 40 to move parallel to the second direction.

[0090] Figure 4 FIG. 7 shows the structure of a lifting assembly 70 provided in an embodiment of the present application. Figure 4 As shown, the lifting assembly 70 includes a base plate 71, a top plate 72, a screw assembly 73 and at least two four-bar linkage components 74. The screw assembly 73 and the at least two four-bar linkage components 74 are located between the base plate 71 and the top plate 72. The at least two four-bar linkage components 74 are arranged in pairs and symmetrically distributed on opposite sides of the screw assembly 73.

[0091] The bottom plate 71 is placed on the base 20, and its connection structure with the base 20 can be designed as needed. For example, at least one first assembly hole (not shown) is provided on the bottom plate 71, and at least one second assembly hole (not shown) is provided on the base 20. A first fastener (not shown) passes through the first assembly hole and the second assembly hole to fasten the bottom plate 71 and the base 20 together.

[0092] The top plate 72 is used to support the fixing assembly 40, and its connection structure with the fixing assembly 40 can be designed as required. For example, at least one third assembly hole (not shown) is provided on the top plate 72, and at least one fourth assembly hole (not shown) is provided on the fixing assembly 40. A second fastener (not shown) passes through the third and fourth assembly holes to fasten the top plate 72 and the fixing assembly 40 together.

[0093] The bottom plate 71 and top plate 72 are connected by at least two four-bar linkages 74. Each four-bar linkage 74 is a diamond-shaped structure composed of four connecting rods hinged end-to-end. This diamond-shaped structure folds at each hinge point, changing its shape. This changes the distance between the bottom plate 71 and top plate 72 connected to the diamond-shaped structure. When the distance between the bottom plate 71 and top plate 72 increases, the lifting assembly 70 is considered to be "raising." When the distance between the bottom plate 71 and top plate 72 decreases, the lifting assembly 70 is considered to be "lowering."

[0094] The lead screw assembly 73 is connected to the four-bar linkage 74 and is used to drive at least a portion of the four-bar linkage 74 to move, thereby changing the folding range of the four-bar linkage 74. Figure 5 As shown, the lead screw assembly 73 has an operating handle 738 , and the user can adjust the lead screw assembly 73 by rotating the operating handle 738 , thereby adjusting the folding range of the four-bar linkage 74 .

[0095] like Figure 5 As shown, the screw assembly 73 has at least two first movable connection ends 7311 and at least two second movable connection ends 7321, and the at least two first movable connection ends 7311 and the at least two second movable connection ends 7321 can move closer to each other or move away from each other. Figure 4 and Figure 5 As shown, each four-link member 74 includes a first hinge end 741, a second hinge end 742, a third hinge end 743 and a fourth hinge end 744 arranged in sequence, wherein the first hinge end 741 and the third hinge end 743 are positioned opposite to each other and are connected to the first movable connection end 7311 and the second movable connection end 7321 respectively; the second hinge end 742 and the fourth hinge end 744 are positioned opposite to each other and are connected to the bottom plate 71 and the top plate 72 respectively.

[0096] When the first hinge end 741 and the third hinge end 743 move closer to each other, driven by the first movable connection end 7311 and the second movable connection end 7321, respectively, the distance between the second hinge end 742 and the fourth hinge end 744 increases, thereby increasing the spacing between the top plate 72 and the bottom plate 71, and the lifting assembly 70 rises. When the first hinge end 741 and the third hinge end 743 move away from each other, driven by the first movable connection end 7311 and the second movable connection end 7321, the distance between the second hinge end 742 and the fourth hinge end 744 decreases, thereby decreasing the spacing between the top plate 72 and the bottom plate 71, and the lifting assembly 70 descends.

[0097] In some embodiments of the present application, Figure 5 As shown, the screw assembly 73 includes a first connecting rod 731, a second connecting rod 732, and a screw rod 733. The first connecting rod 731 has two first movable connecting ends 7311. The first connecting rod 731 is further provided with a first threaded hole 7312, and the first threaded hole 7312 is located between the two first movable connecting ends 7311. The second connecting rod 732 has two second movable connecting ends 7321. The second connecting rod 732 is further provided with a second threaded hole 7322, and the second threaded hole 7322 is located between the two second movable connecting ends 7321. The thread rotation direction of the second threaded hole 7322 is opposite to that of the first threaded hole 7312. A bidirectional thread is provided on the outer wall of the screw rod 733. The screw rod 733 passes through the first threaded hole 7312 and the second threaded hole 7322, and is threadedly engaged with the first threaded hole 7312 and the second threaded hole 7322 respectively through the bidirectional thread.

[0098] The bidirectional threads on the outer wall of the screw rod 733 are threadedly matched with the first threaded hole 7312 and the second threaded hole 7322 respectively. Therefore, when the operating handle 738 is rotated, one of the first connecting rod 731 and the second connecting rod 732 moves toward the direction close to the operating handle 738, and the other moves away from the operating handle 738, so that the first connecting rod 731 and the second connecting rod 732 can move closer to or away from each other.

[0099] In some embodiments of the present application, the number of the four-link members 74 may be greater, so as to more stably support the top plate 72 and prevent the top plate 72 from shaking during the process of rising and falling relative to the bottom plate 71 .

[0100] For example, see Figure 4 and Figure 5There are two pairs of four-link components 74, and the number of first connecting rods 731 and second connecting rods 732 are both two. The two first movable connecting ends 7311 of each first connecting rod 731 are respectively connected to the first hinge ends 741 of the two paired four-link components 74, and the two second movable connecting ends 7321 of each second connecting rod 732 are respectively connected to the third hinge ends 743 of the two paired four-link components 74.

[0101] The lead screw assembly 73 further includes at least one first connecting shaft 734, at least one second connecting shaft 735, a first stopper 736, and a second stopper 737. The first stopper 736 is provided with a first through-hole 7361, and the second stopper 737 is provided with a second through-hole 7371. The diameters of the first through-hole 7361 and the second through-hole 7371 are both larger than the diameter of the lead screw 733. The first through-hole 7361 and the second through-hole 7371 may be clear holes, which allow the first stopper 736 and the second stopper 737 to be movably mounted on the lead screw 733.

[0102] The screw rod 733 passes through the first threaded hole 7312 on the first first connecting rod 731, the first through hole 7361 on the first limit block 736, the second threaded hole 7322 on the first second connecting rod 732, the second through hole 7371 on the second limit block 737, and the first threaded hole 7312 on the second first connecting rod 731 in sequence, and there is a gap between at least one of the first limit block 736 and the second limit block 737 and the adjacent first connecting rod 731 and / or second connecting rod 732.

[0103] The first limit block 736 and the second limit block 737 are used to limit the highest and lowest lifting positions of the lifting assembly 70. Figure 4 As shown, when the first first connecting rod 731 and the first second connecting rod 732 move toward each other until they respectively abut against both sides of the second limit block 737, the first hinge end 741 and the third hinge end 743 of the connecting rod assembly are limited and cannot move further toward each other. At this time, the distance between the top plate 72 and the bottom plate 71 reaches the maximum, and the lifting assembly 70 is at the highest lifting position. When the first first connecting rod 731 and the first second connecting rod 732 move away from each other until the first second connecting rod 732 and the second first connecting rod 731 respectively abut against both sides of the first limit block 736, the first hinge end 741 and the third hinge end 743 of the connecting rod assembly are limited and cannot move further away. At this time, the distance between the top plate 72 and the bottom plate 71 reaches the minimum, and the lifting assembly 70 is at the lowest lifting position. At the same time, the presence of the first limit block 736 can also limit the insertion depth of the screw rod 733 in the first threaded hole 7312 of the second first connecting rod 731, preventing the end of the screw rod 733 from escaping from the first threaded hole 7312 of the second first connecting rod 731.

[0104] The second second connecting rod 732 is located on the side of the second first connecting rod 731 away from the second stopper 737. The second second connecting rod 732 may have a second threaded hole 7322, through which the screw rod 733 may pass. Alternatively, the second second connecting rod 732 may not have the second threaded hole 7322, and the two second connecting rods 732 may be connected by a second connecting shaft 735 for interlocking movement.

[0105] like Figure 5 As shown, the two first connecting rods 731 are connected by at least one first connecting shaft 734 , and the two second connecting rods 732 are connected by at least one second connecting shaft 735 .

[0106] Illustratively, there are two first connecting shafts 734, one located on opposite sides of the screw rod 733, with both ends of each first connecting shaft 734 fixedly connected to the two first connecting rods 731. There are two second connecting shafts 735, one located on opposite sides of the screw rod 733, with both ends of each second connecting shaft 735 fixedly connected to the two second connecting rods 732.

[0107] In some embodiments, as Figure 5 As shown, the first second connecting rod 732 may be provided with two third through-holes 7323, and the two first connecting shafts 734 respectively pass through the two third through-holes 7323, and the two ends of each first connecting shaft 734 are respectively connected to the two first connecting rods 731. A clearance fit is formed between the first connecting shaft 734 and the third through-holes 7323, and the first connecting shaft 734 can also serve as a guide when the first second connecting rod 732 moves.

[0108] The second first connecting rod 731 may be provided with two fourth through-holes 7313, through which two second connecting shafts 735 pass, respectively. The two ends of each second connecting shaft 735 are connected to the two second connecting rods 732. A clearance fit is provided between the second connecting shafts 735 and the fourth through-holes 7313, allowing the second connecting shafts 735 to serve as guides when the second first connecting rod 731 moves.

[0109] Therefore, in the embodiment of the present application, the distance between the top plate 72 and the bottom plate 71 is adjusted by using a lead screw assembly 73 in conjunction with at least two four-bar linkage members 74. Furthermore, when the bottom plate 71 is fixed, the top plate 72 can drive the fixing assembly 40 to reciprocate in the second direction to adjust the position of the cylindrical battery 00. The lifting assembly 70 has a simple structure and is easy to operate.

[0110] In some embodiments of the present application, Figure 4As shown, a first avoidance groove 711 is provided on the surface of the bottom plate 71 facing the top plate 72, and at least a portion of the second hinged end 742 of the four-bar link member 74 is located in the first avoidance groove 711. A second avoidance groove 721 is provided on the surface of the top plate 72 facing the bottom plate 71, and at least a portion of the fourth hinged end 744 of the four-bar link member 74 is located in the second avoidance groove 721.

[0111] When the four-bar linkage 74 changes shape, the two links connected by the second hinged end 742 require a certain amount of rotational space. To prevent the bottom plate 71 from obstructing the movement of these two links, a first avoidance groove 711 is provided on the surface of the bottom plate 71 facing the top plate 72. Similarly, the two links connected by the fourth hinged end 744 also require a certain amount of rotational space. To prevent the top plate 72 from obstructing the movement of these two links, a second avoidance groove 721 is provided on the surface of the top plate 72 facing the bottom plate 71.

[0112] Optionally, the first avoidance groove 711 and the second avoidance groove 721 are both V-shaped grooves or trapezoidal grooves to adapt to the boundary shape of the rotation space of the connecting rod.

[0113] In some embodiments of the present application, a fixing assembly 40 for fixing a cylindrical battery 00 to be disassembled may include a fixing seat 41, a fixing frame 42, a positioning sleeve 43 and at least two push rods 44; the fixing frame 42 and the positioning sleeve 43 are connected to the fixing seat 41, and the positioning sleeve 43 is located on the inner side of the fixing frame 42; at least two push rods 44 are respectively installed on the opposite side frame walls of the fixing frame 42, and can move closer to or away from each other relative to the fixing frame 42.

[0114] The fixing frame 42 is a structure with two ends open, one end of which is connected to the surface of the fixing seat 41, thereby enclosing the positioning sleeve 43; the other end of the fixing frame 42 is open toward the tool assembly 30, so that the cylindrical battery 00 can contact and cooperate with the cutter 31.

[0115] The positioning sleeve 43 is used to pre-fix the cylindrical battery 00, wherein the negative terminal of the cylindrical battery 00 can be plugged into the positioning sleeve 43. At least two ejector pins 44 are used to strengthen the fixation of the cylindrical battery 00, wherein a plurality of ejector pins 44 are evenly installed along the circumference of the frame wall of the fixing frame 42. After the cylindrical battery 00 is pre-fixed, each ejector pin 44 abuts against the outer wall of the cylindrical battery 00, thereby keeping the cylindrical battery 00 upright and fixed. In the embodiment of the present application, the cylindrical battery 00 is in an upright state, which means that the axis of the cylindrical battery 00 is parallel to the second direction.

[0116] For example, Figure 6As shown, the fixed frame 42 is a square structure with four frame walls. Each frame wall is provided with a strip hole, and a push rod 44 is installed in each strip hole.

[0117] Since the strip-shaped hole extends along the second direction, the top rod 44 installed in the strip-shaped hole can move in the second direction, thereby meeting the fixing requirements of cylindrical batteries 00 of different lengths and avoiding the sealing of the positive end of the cylindrical battery 00.

[0118] Each push rod 44 includes a screw rod passing through a strip hole, and two nuts sleeved on the screw rod, and the two nuts are respectively located on the inner and outer sides of the frame wall of the fixed frame 42. By adjusting the position of the two nuts, the length of the screw rod inserted into the fixed frame 42 can be adjusted to achieve the pressure on cylindrical batteries 00 of different diameters; and through the cooperation between the two nuts, the screw rod can be fastened to the frame wall of the fixed frame 42 to achieve the fixation of the position of the cylindrical battery 00. Among them, the end of the screw rod used to press the cylindrical battery 00 can be connected to a flexible structure such as a rubber block to prevent scratches or damage to the cylindrical battery 00.

[0119] In some embodiments of the present application, Figure 6 As shown, the inner side wall of the positioning sleeve 43 is stepped, including a first annular surface 431, a step surface 432 and a second annular surface 433 connected in sequence. The first annular surface 431 is located on the side of the second annular surface 433 away from the fixing seat 41, and the diameter of the first annular surface 431 is larger than the diameter of the second annular surface 433.

[0120] The first annular surface 431 and the second annular surface 433 are respectively used to pre-fix cylindrical batteries 00 of different diameters. For example, the inner diameter of the first annular surface 431 is equal to or slightly larger than the outer diameter of a 21700 battery, so it can pre-fix a 21700 battery; the inner diameter of the second annular surface 433 is equal to or slightly larger than the outer diameter of an 18650 battery, so it can pre-fix an 18650 battery.

[0121] Therefore, the fixing assembly 40 and the battery disassembly device provided in the embodiment of the present application have good versatility and can be applied to cylindrical batteries 00 of different models and sizes.

[0122] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0123] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A battery disassembly device, characterized in that: The device comprises a stand (10), a base (20), a tool assembly (30) and a fixing assembly (40); The stand (10) is mounted on the base (20), and an installation space (11) is formed between the stand (10) and the base (20); The tool assembly (30) is mounted on the stand (10), and the tool assembly (30) includes a cutter (31), at least a portion of the cutter (31) is located in the mounting space (11); The fixing assembly (40) is located on the base (20) and is used to fix the cylindrical battery (00), and at least a portion of the fixing assembly (40) is located within the installation space (11); At least one of the cutter (31) and the fixing assembly (40) can reciprocate along a first direction and / or a second direction, respectively, the first direction being parallel to the radial direction of the cylindrical battery (00) fixed by the fixing assembly (40), and the second direction being parallel to the axial direction of the cylindrical battery (00) fixed by the fixing assembly (40).

2. The battery disassembly device according to claim 1, characterized in that: The tool assembly (30) is fixedly connected to the stand (10), and the stand (10) can reciprocate along the first direction and / or the second direction relative to the base (20).

3. The battery disassembly device according to claim 2, characterized in that: The stand (10) comprises a suspension rod (12) and two support rods (13), the two support rods (13) are respectively placed on the base (20) and spaced apart from each other, the suspension rod (12) connects one end of the two support rods (13) away from the base (20), and the tool assembly (30) is mounted on the suspension rod (12); The device comprises at least one of a translation assembly (50) and a telescopic assembly (60), wherein the translation assembly (50) can provide displacement parallel to the first direction, and the two support rods (13) are respectively connected to the base (20) through the translation assembly (50); the telescopic assembly (60) can provide displacement parallel to the second direction, and the two support rods (13) respectively have the telescopic assembly (60).

4. The battery disassembly device according to claim 3, characterized in that: The translation assembly (50) includes a slide rail (51), a sliding portion (52) and a stop portion (53); The sliding portion (52) is slidably mounted on the slide rail (51), and the support rod (13) and the base (20) are connected to one of the slide rail (51) and the sliding portion (52) respectively; The stop portion (53) is connected to at least one of the sliding portion (52) and the slide rail (51) to prevent the sliding portion (52) from sliding on the slide rail (51).

5. The battery disassembly device according to claim 4, characterized in that: A first positioning hole (511) is provided on the surface of the slide rail (51) facing the sliding portion (52), and the first positioning hole (511) is located on the sliding path of the sliding portion (52); The stop portion (53) is detachably mounted on the first positioning hole (511) and can abut against the sliding portion (52) along the first direction.

6. The battery disassembly device according to claim 3, characterized in that: A mounting hole (121) and an annular limiting groove (122) are provided on the surface of the suspension rod (12) facing the mounting space (11), and the annular limiting groove (122) surrounds the outer side of the mounting hole (121); The tool assembly (30) comprises a drive motor (32), a connecting member (33) and a cutter shaft (34); the drive motor (32) is installed in the mounting hole (121), and the axis of the output shaft of the drive motor (32) coincides with the central axis of the mounting hole (121); the two ends of the connecting member (33) are respectively connected to the output shaft of the drive motor (32) and the cutter shaft (34); one end of the cutter shaft (34) is located in the annular limiting groove (122), and the other end is vertically connected to the cutter (31); the axis of the cutter shaft (34) is parallel to the axis of the output shaft of the drive motor (32).

7. The battery disassembly device according to any one of claims 1 to 6, characterized in that: The device comprises a lifting assembly (70), wherein the lifting assembly (70) is placed on the base (20), and the fixing assembly (40) is placed on a side of the lifting assembly (70) away from the base (20), and the lifting assembly (70) can drive the fixing assembly (40) to move parallel to the second direction.

8. The battery disassembly device according to claim 7, characterized in that: The lifting assembly (70) comprises a bottom plate (71), a top plate (72), a screw assembly (73) and at least two four-link components (74), wherein the screw assembly (73) and the at least two four-link components (74) are located between the bottom plate (71) and the top plate (72), and the at least two four-link components (74) are arranged in pairs and symmetrically distributed on opposite sides of the screw assembly (73); The lead screw assembly (73) has at least two first movable connection ends (7311) and at least two second movable connection ends (7321), and the at least two first movable connection ends (7311) and the at least two second movable connection ends (7321) can move toward or away from each other; Each of the four-link members (74) includes a first hinge end (741), a second hinge end (742), a third hinge end (743) and a fourth hinge end (744) arranged in sequence, wherein the first hinge end (741) and the third hinge end (743) are respectively connected to the first movable connection end (7311) and the second movable connection end (7321), and the second hinge end (742) and the fourth hinge end (744) are respectively connected to the bottom plate (71) and the top plate (72).

9. The battery disassembly device according to claim 8, characterized in that: The screw assembly (73) includes a first connecting rod (731), a second connecting rod (732) and a screw rod (733); The first connecting rod (731) has two first movable connecting ends (7311), and the first connecting rod (731) is further provided with a first threaded hole (7312), and the first threaded hole (7312) is located between the two first movable connecting ends (7311); The second connecting rod (732) has two second movable connecting ends (7321), and the second connecting rod (732) is further provided with a second threaded hole (7322). The second threaded hole (7322) is located between the two second movable connecting ends (7321), and the thread rotation direction of the second threaded hole (7322) is opposite to the thread rotation direction of the first threaded hole (7312); A bidirectional thread is provided on the outer wall of the screw rod (733), and the screw rod (733) passes through the first threaded hole (7312) and the second threaded hole (7322), and is threadedly engaged with the first threaded hole (7312) and the second threaded hole (7322) respectively through the bidirectional thread.

10. The battery disassembly device according to claim 9, characterized in that: The number of the four-bar linkage members (74) is two pairs, the number of the first connecting rods (731) and the number of the second connecting rods (732) are both two, the two first movable connecting ends (7311) of each first connecting rod (731) are respectively connected to the first hinge ends (741) of the two paired four-bar linkage members (74), and the two second movable connecting ends (7321) of each second connecting rod (732) are respectively connected to the third hinge ends (743) of the two paired four-bar linkage members (74); The screw assembly (73) further comprises at least one first connecting shaft (734), at least one second connecting shaft (735), a first limiting block (736) and a second limiting block (737); the first limiting block (736) is provided with a first through hole (7361), the second limiting block (737) is provided with a second through hole (7371), and the apertures of the first through hole (7361) and the second through hole (7371) are both larger than the rod diameter of the screw rod (733); The screw rod (733) sequentially passes through a first threaded hole (7312) on a first connecting rod (731), a first through hole (7361) on the first limiting block (736), a second threaded hole on a second connecting rod (732), a second through hole (7371) on the second limiting block (737), and a first threaded hole (7312) on another first connecting rod (731), and at least one of the first limiting block (736) and the second limiting block (737) has a gap with the adjacent first connecting rod (731) and / or the second connecting rod (732); Another second connecting rod (732) is located on a side of the other first connecting rod (731) away from the second limiting block (737); The two first connecting rods (731) are connected via the at least one first connecting shaft (734), and the two second connecting rods (732) are connected via the at least one second connecting shaft (735).

11. The battery disassembly device according to any one of claims 8 to 10, characterized in that: A first avoidance groove (711) is provided on the surface of the bottom plate (71) facing the top plate (72), and at least a portion of the second hinge end (742) of the four-bar connecting member (74) is located in the first avoidance groove (711); and / or, A second avoidance groove (721) is provided on the surface of the top plate (72) facing the bottom plate (71), and at least a portion of the fourth hinge end (744) of the four-bar connecting member (74) is located in the second avoidance groove (721).

12. The battery disassembly device according to claim 1, characterized in that: The fixing assembly (40) includes a fixing seat (41), a fixing frame (42), a positioning sleeve (43) and at least two push rods (44); The fixing frame (42) and the positioning sleeve (43) are connected to the fixing seat (41), and the positioning sleeve (43) is located on the inner side of the fixing frame (42); The at least two push rods (44) are respectively mounted on the frame walls on opposite sides of the fixed frame (42) and can move closer to or farther from each other relative to the fixed frame (42).

13. The battery disassembly device according to claim 12, characterized in that: The inner side wall of the positioning sleeve (43) is stepped, comprising a first annular surface (431), a stepped surface (432), and a second annular surface (433) connected in sequence, wherein the first annular surface (431) is located on a side of the second annular surface (433) away from the fixing seat (41), and the diameter of the first annular surface (431) is greater than the diameter of the second annular surface (433).

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