Battery case necking mechanism

Abstract

The application discloses a battery shell necking mechanism, which comprises a first necking assembly and a second necking assembly. The first necking assembly comprises a telescopic sleeve, a cavity for accommodating one end of a battery shell to be necked is arranged in the telescopic sleeve, the hardness of the telescopic sleeve is greater than that of the battery shell, and the inner diameter of the telescopic sleeve can be changed. The second necking assembly comprises a first driving member and a necking member. A necking hole is formed in the side of the necking member close to the telescopic sleeve. The first driving member is used for driving the necking member to move along the axial direction of the telescopic sleeve. The necking member has a first position and a second position. When the necking member is in the first position, the necking member is spaced from the telescopic sleeve. When the necking member moves to the second position, the telescopic sleeve is inserted into the necking hole, and the inner diameter of the telescopic sleeve is reduced. By arranging the necking member, the difficulty in controlling the inner diameter of the telescopic sleeve can be reduced by adopting a physical extrusion contact mode, and the difficulty in necking operation is reduced.

Description

Technical Field

[0001] This invention relates to the field of battery processing equipment, and more particularly to a battery casing necking mechanism. Background Technology

[0002] In the production process of lithium batteries, one end of the casing needs to be tapered. The purpose is to eliminate the free movement of the core during the winding process, shape the steel casing, facilitate the grooving process in the next station, reduce the spacing between battery packs, increase energy density, and improve the overall yield. Traditional cylindrical steel-cased battery tapering uses an oil injection machine to control the jig to achieve the tapering process. The tapering mechanism is complex, prone to oil seepage, inconvenient to maintain, has low production efficiency, and high institutional costs. Summary of the Invention

[0003] The purpose of this invention is to provide a battery casing shrinking mechanism that has a simple structure, high concentricity, good battery consistency, and fast shrinking speed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A battery casing narrowing mechanism is provided, comprising:

[0006] The first shrinking assembly includes a telescopic sleeve, which has a cavity for accommodating at least one end of the battery housing. The hardness of the telescopic sleeve is greater than that of the battery housing, and the inner diameter of the telescopic sleeve can be changed.

[0007] The second shrinking assembly includes a first driving member and a shrinking member. The shrinking member has a shrinking hole on the side near the telescopic sleeve, and the axis of the shrinking hole coincides with the axis of the telescopic sleeve. The first driving member is connected to the shrinking member and is used to drive the shrinking member to reciprocate along the axis of the telescopic sleeve. The shrinking member can move to a working position so that the telescopic sleeve is inserted into the shrinking hole, and the inner diameter of the telescopic sleeve is reduced.

[0008] As a preferred embodiment of the battery casing narrowing mechanism, it includes a base, on which the first narrowing component and the second narrowing component are both disposed. The telescopic sleeve includes at least two grippers, which are movably connected to the base. All the grippers are arranged in a ring around the axis of the narrowing hole, and the grippers are capable of moving in a direction perpendicular to the axis of the narrowing hole.

[0009] As a preferred embodiment of the battery casing narrowing mechanism, the first narrowing assembly further includes a fixed base, and the gripper is connected to the fixed base through an elastic element, the elastic element always having a tendency to drive the gripper to move away from the axis of the narrowing hole.

[0010] As a preferred embodiment of the battery casing narrowing mechanism, the fixing base includes a fixing plate, and the fixing plate has a surrounding wall on the side facing the narrowing member. The gripper includes a gripper body and a connecting plate. The gripper body is located in the annular area of ​​the surrounding wall. The surrounding wall has a first mounting hole. One end of the connecting plate is fixed to the gripper body, and the other end passes through the first mounting hole and is connected to the elastic member.

[0011] As a preferred embodiment of the battery casing narrowing mechanism, the outer side of the claw body is provided with a guide slope, one end of which is connected to the end face of the claw body, and the other end is inclined toward the side away from the axis of the narrowing hole.

[0012] As a preferred embodiment of the battery casing narrowing mechanism, the narrowing hole is funnel-shaped near the end of the telescopic sleeve, and the diameter of the narrowing hole gradually increases near the end of the telescopic sleeve along the direction from the narrowing member to the telescopic sleeve.

[0013] As a preferred embodiment of the battery casing narrowing mechanism, the narrowing component includes a connecting shaft and a sleeve. The axis of the connecting shaft coincides with the axis of the telescopic sleeve. One end of the connecting shaft is connected to the first driving component, and the other end is connected to the sleeve. The narrowing hole is disposed inside the sleeve.

[0014] As a preferred embodiment of the battery casing narrowing mechanism, it includes a base, on which the first narrowing component and the second narrowing component are both disposed. The second narrowing component further includes a guide sleeve, which is fixedly connected to the base and is sleeved on the outer periphery of the narrowing component.

[0015] As a preferred embodiment of the battery casing narrowing mechanism, it includes a feeding assembly, which includes a second driving member and a feeding rod. The axis of the feeding rod coincides with the axis of the narrowing member. The second driving member drives the feeding rod to move along the axial direction. The feeding rod can move to insert into the telescopic sleeve and push out the battery casing inside the telescopic sleeve.

[0016] As a preferred embodiment of the battery casing necking mechanism, the necking component is provided with a second mounting hole, the feeding rod is slidably disposed in the second mounting hole, the necking component is provided with a first clearance hole communicating with the second mounting hole, the length of the first clearance hole extends along the axial direction of the feeding rod, and the second driving component passes through the first clearance hole and is connected to the feeding rod.

[0017] The beneficial effects of this invention are as follows: By setting an adjustable inner diameter telescopic sleeve, the battery casing can be placed inside the telescopic sleeve for preparation before the necking operation. When the necking component moves to the second position and the inner diameter of the telescopic sleeve shrinks, the battery casing can be squeezed to form a neck due to the greater hardness of the telescopic sleeve than that of the battery casing. Since the battery casing is placed inside the telescopic sleeve, when the inner diameter of the telescopic sleeve decreases and squeezes the battery casing, all circumferential positions of the battery casing are simultaneously squeezed by the telescopic sleeve, which can make the battery casing be subjected to uniform force in all directions, avoiding positional displacement of the battery casing. The synchronous circumferential contraction of the battery casing can ensure that the center of the necking circle formed on the battery casing is coaxial with the battery casing, improving the processing quality of the necking. By setting a necking component and adopting a physical extrusion contact method, the difficulty of controlling the inner diameter of the telescopic sleeve can be reduced, thus reducing the difficulty of the necking operation. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the battery casing narrowing mechanism according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional schematic diagram of the battery casing narrowing mechanism described in an embodiment of the present invention.

[0021] Figure 3 This is a partial cross-sectional view of the battery casing narrowing mechanism described in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the first narrowing component in an embodiment of the present invention.

[0023] In the picture:

[0024] 100. Battery casing;

[0025] 1. Base; 101. Mounting plate; 2. Telescopic sleeve; 201. Claw; 2011. Claw body; 2012. Connecting plate; 2013. Flanged edge; 2014. Guide slope; 3. Fixed seat; 301. Fixed plate; 302. Enclosure; 4. Elastic element; 401. Pin; 402. Spring; 5. Bushing; 6. Narrowing part; 601. Connecting shaft; 6011. Second mounting hole; 6012. First clearance hole; 602. Sleeve head; 6021. Narrowing hole; 7. Guide sleeve; 701. Second clearance hole; 8. First cylinder; 9. Floating joint; 10. Second cylinder; 11. Connecting block; 12. Feeding rod. Detailed Implementation

[0026] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figures 1 to 3As shown, the present invention provides a battery casing narrowing mechanism (hereinafter referred to as narrowing mechanism), including a base 1, a first narrowing assembly, and a second narrowing assembly. The first narrowing assembly includes a telescopic sleeve 2, which is disposed on the base 1. The telescopic sleeve 2 has a cavity inside for accommodating the end of the battery casing 100 that needs to be narrowed. The hardness of the telescopic sleeve 2 is greater than the hardness of the battery casing 100, and the inner diameter of the telescopic sleeve 2 can be changed. The second narrowing assembly includes a first driving member and a narrowing member 6. The narrowing member 6 has a narrowing hole 6 on the side near the telescopic sleeve 2. 021, the axis of the constricted hole 6021 coincides with the axis of the telescopic sleeve 2. The first driving member is connected to the constricted member 6. The first driving member is used to drive the constricted member 6 to reciprocate along the axis of the constricted hole 6021. The constricted member 6 has a first position and a second position. The second position is the working position. When the constricted member 6 is in the first position, the constricted member 6 is spaced apart from the telescopic sleeve 2. When the constricted member 6 moves to the second position, that is, when the constricted member 6 moves to the working position, the telescopic sleeve 2 is inserted into the constricted hole 6021, and the inner diameter of the telescopic sleeve 2 is reduced. By setting an adjustable inner diameter telescopic sleeve 2, the battery casing 100 can be placed inside the telescopic sleeve 2 for preparation before the necking operation. When the necking component 6 moves to the second position and the inner diameter of the telescopic sleeve 2 shrinks, the battery casing 100 can be squeezed to form a neck due to the greater hardness of the telescopic sleeve 2 than that of the battery casing 100. Since the battery casing 100 is placed inside the telescopic sleeve 2, when the inner diameter of the telescopic sleeve 2 shrinks and squeezes the battery casing 100, all circumferential positions of the battery casing 100 are simultaneously squeezed by the telescopic sleeve 2, which can make the battery casing 100 be subjected to uniform force in all directions, avoiding positional displacement of the battery casing 100. The synchronous circumferential contraction of the battery casing 100 can ensure that the center of the necking circle formed on the battery casing 100 is coaxial with the battery casing 100, improving the processing quality of the necking. By setting the necking component 6 and using physical extrusion contact, the difficulty of controlling the inner diameter of the telescopic sleeve 2 can be reduced, thus reducing the difficulty of the necking operation.

[0029] In this embodiment, the telescopic sleeve 2 has an expanded state and a contracted state. When the telescopic sleeve 2 is in the expanded state, the inner diameter of the telescopic sleeve 2 is larger than the diameter of the battery housing 100. When the constriction member 6 moves to the second position, the telescopic sleeve 2 is inserted into the constriction hole 6021. When the telescopic sleeve 2 is in the contracted state, the inner diameter of the telescopic sleeve 2 is smaller than the diameter of the battery housing 100, so as to form a constriction on the battery housing 100.

[0030] Specifically, the telescopic sleeve 2 includes at least two grippers 201, as shown in the reference. Figure 4In this embodiment, three grippers 201 are provided. The grippers 201 are movably connected to the base 1. All grippers 201 are arranged in a ring around the axis of the constricted hole 6021. The grippers 201 can move in a direction perpendicular to the axis of the constricted hole 6021. When the constricted part 6 is in the first position, adjacent grippers 201 are spaced apart. When the constricted part 6 is in the second position, the outer surface of the grippers 201 abuts against the wall of the constricted hole 6021, allowing the grippers 201 to move towards the axis of the constricted hole 6021. In this embodiment, the three grippers 201 are combined to form a telescopic sleeve 2. The inner diameter of the telescopic sleeve 2 can be adjusted by adjusting the position between the grippers 201, reducing operational difficulty.

[0031] Specifically, the first necking assembly also includes a fixed base 3. The gripper 201 is connected to the fixed base 3 via an elastic element 4. The elastic element 4 always has a tendency to drive the gripper 201 away from the axis of the necking hole 6021. By setting the fixed base 3 and the elastic element 4, after the necking operation of a battery housing 100 is completed, after the necking component 6 returns from the second position to the first position, the gripper 201 can be reset under the action of the elastic element 4, so that the telescopic sleeve 2 automatically changes from the contracted state to the extended state, which facilitates the robot arm to unload and transfer the necked battery housing 100, and at the same time, it also facilitates the loading of the next battery housing 100 to be necked.

[0032] In this embodiment, the fixing base 3 includes a fixing plate 301. The fixing plate 301 has a surrounding wall 302 on the side facing the constricted member 6. The gripper 201 includes a gripper body 2011 and a connecting plate 2012. The gripper body 2011 is located in the annular area of ​​the surrounding wall 302. The surrounding wall 302 is provided with a first mounting hole. One end of the connecting plate 2012 is fixed to the gripper body 2011, and the other end passes through the first mounting hole and is connected to the elastic member 4. When the constricted member 6 is in the second position, the constricted member 6 is located between the fixing base 3 and the gripper body 2011. Since the necking part 6 needs to cover the outer periphery of the claw body 2011 to realize the necking operation of the battery, the connecting plate 2012 and the first mounting hole are set so that the elastic element 4 can be set on the outside of the fixed base 3, thereby avoiding the elastic element 4 from affecting the movement of the necking part 6; the first mounting hole is set on the enclosure 302 so that the connecting plate 2012 passes through the first mounting hole. At this time, the first mounting hole can also play a guiding role, that is, the first mounting hole can guide the movement of the gripper 201, so that the gripper 201 can move in a direction perpendicular to the axis of the telescopic sleeve 2. In this embodiment, the elastic element 4 includes a pin 401 and a spring 402. The end of the connecting plate 2012 away from the claw body 2011 is provided with a flange 2013. The flange 2013 is parallel to the axial direction of the telescopic sleeve 2. A third mounting hole is provided on the flange 2013. A threaded hole is provided on the outer side of the fixing seat 3. A stud is provided at the end of the pin 401. After the pin 401 passes through the third mounting hole, the stud on the pin 401 is screwed into the threaded hole. The spring 402 is sleeved on the pin 401. The two ends of the spring 402 abut against the fixing seat 3 and the flange 2013 respectively.

[0033] Specifically, the outer surface of the claw body 2011 is provided with a guide slope 2014. One end of the guide slope 2014 is connected to the end face of the claw body 2011, and the other end is inclined toward the side away from the axis of the narrowing hole 6021. During the narrowing operation, the claw 201 needs to be inserted into the narrowing hole 6021 of the narrowing part 6 multiple times. By providing the guide slope 2014, the movement of the narrowing part 6 can be guided, avoiding collision between the claw 201 and the end face of the narrowing part 6, and ensuring the stable operation of the narrowing mechanism.

[0034] Reference Figure 2 and Figure 3 Specifically, the constricted hole 6021 is flared at the end near the gripper 201, and its diameter gradually increases from bottom to top at the end near the telescopic sleeve 2. By setting the constricted hole 6021 to be flared at the end near the gripper, the diameter of the constricted hole 6021 near the gripper is made larger, further preventing the end face of the constricted part 6 from colliding with the gripper 201.

[0035] Specifically, the constriction member 6 includes a connecting shaft 601 and a sleeve 602. The axis of the connecting shaft 601 coincides with the axis of the telescopic sleeve 2. One end of the connecting shaft 601 is connected to the first driving member, and the other end is connected to the sleeve 602 by a screw. The constriction hole 6021 is set inside the sleeve 602. In this embodiment, the hole wall of the constriction hole 6021 needs to press the gripper 201 to achieve the gripper 201 pressing the battery casing 100 to form a constriction. To avoid deformation, the hardness of the hole wall of the constriction hole 6021 needs to be sufficiently high. Correspondingly, the manufacturing material is also relatively expensive. By setting the connecting shaft 601 and the sleeve 602, and setting the constriction hole 6021 inside the sleeve 602, the length of the sleeve 602 can be appropriately reduced, saving material consumption and reducing costs. In this embodiment, both the sleeve 602 and the gripper 201 need to be manufactured using materials with high hardness. For example, the material of the sleeve 602 and the gripper 201 can be SKD-11 (SKD11 is a high wear-resistant and tough general-purpose cold work die steel, high carbon and high chromium alloy tool steel, and vacuum degassing refined steel. It is pure in quality and has good hardenability with good hardenability and small quenching deformation). Of course, the sleeve 602 and the gripper 201 can also be supported by other high-hardness materials. The materials of the sleeve 602 and the gripper 201 can be the same or different.

[0036] In this embodiment, the first driving component is a first cylinder 8. The cylinder body of the first cylinder 8 is fixed to the base 1, and the piston rod of the first cylinder 8 is connected to the connecting shaft 601 via a floating joint 9. Eccentricity and poor balance accuracy may occur between the connecting shaft 601 and the piston rod of the first cylinder 8, leading to problems such as piston rod bending. The floating joint 9 can absorb the eccentricity and insufficient parallelism between the connecting shaft 601 and the first cylinder 8, allowing the first cylinder 8 and the connecting shaft 601 to operate within the allowable eccentricity range. This eliminates the need for centering and final fine-tuning during the installation of the first cylinder 8. It also eliminates interference caused by connection errors between the two shafts and can appropriately amplify the machining accuracy of the mating parts.

[0037] Specifically, the second necking assembly also includes a guide sleeve 7, which is fixedly connected to the base 1 and is sleeved on the outer periphery of the connecting shaft 601. In this embodiment, the connecting shaft 601 is relatively long, and it may deviate during movement. The guide sleeve 7 can guide the movement of the connecting shaft 601, avoid large deflections in the direction of movement of the connecting shaft 601, and ensure the necking quality of the battery casing 100.

[0038] In this embodiment, the second narrowing component is located below the first narrowing component, that is, the telescopic sleeve 2 is above the narrowing component 6. The base 1 includes a mounting plate 101, and the upper surface of the fixing plate 301 is fixed to the lower surface of the mounting plate 101. The fixing base 3 and the mounting plate 101 are respectively provided with a first hole and a second hole corresponding to the position of the telescopic sleeve 2. A bushing 5 is provided in the second hole. The battery housing 100 to be narrowed passes through the bushing 5 and the first hole and is placed in the telescopic sleeve 2. The first cylinder 8 drives the sleeve head 602 to move upward through the connecting shaft 601, so that the sleeve head 602 is inserted into the gap between the gripper 201 and the fixing base 3. The hole wall of the narrowing hole 6021 of the sleeve head 602 squeezes the gripper body 2011, thereby moving the gripper body 2011. The telescopic sleeve 2 contracts and squeezes the battery housing 100 to achieve narrowing of the battery housing 100. After the narrowing is completed, the first cylinder 8 drives the sleeve head 602 to reset, the elastic element 4 drives the gripper 201 to reset, and the telescopic sleeve 2 expands.

[0039] Specifically, the necking mechanism includes a feeding assembly, which comprises a second drive member and a feeding rod 12. The axis of the feeding rod 12 coincides with the axis of the necking member 6. The second drive member drives the feeding rod 12 to move along the axial direction, allowing the feeding rod 12 to move into the telescopic sleeve 2 and push out the battery housing 100 inside the telescopic sleeve 2. By setting the feeding assembly, after the necking is completed, the first cylinder 8 drives the sleeve head 602 to reset, the elastic member 4 drives the gripper 201 to reset, the telescopic sleeve 2 expands, and the second drive member can drive the feeding rod 12 to move upward. The end of the feeding rod 12 can push the battery housing 100 out of the telescopic sleeve 2, facilitating the transfer of the battery housing 100 by the robotic arm.

[0040] Specifically, a second mounting hole 6011 is provided inside the connecting shaft 601 of the constricted part 6. The feeding rod 12 is slidably disposed inside the second mounting hole 6011. A first clearance hole 6012 communicating with the second mounting hole 6011 is provided on the connecting shaft 601. A second clearance hole 701 is provided on the guide sleeve 7 at the position corresponding to the first clearance hole 6012. The lengths of the first clearance hole 6012 and the second clearance hole 701 extend vertically. The second driving member passes through the second clearance hole 701 and the first clearance hole 6012 and connects to the feeding rod 12. By providing a second mounting hole 6011 inside the connecting shaft 601, the connecting shaft 601, the feeding rod 12, the sleeve head 602, and the telescopic sleeve 2 can be concentrically arranged. The feeding rod 12 only needs to move up and down to realize the feeding operation, which is simple to operate.

[0041] In this embodiment, the second driving component is a second cylinder 10, which is a pen-shaped cylinder. The cylinder body of the second cylinder 10 is fixed to the base 1. A floating joint 9 is provided on the piston rod of the second cylinder 10. The floating joint 9 on the second cylinder 10 is connected to the feeding rod 12 through the connecting block 11.

[0042] Since the connecting shaft 601, the feeding rod 12, the sleeve head 602, and the telescopic sleeve 2 can be arranged concentrically, the diameter of the feeding rod 12 can be made smaller, so that the diameter of the feeding rod 12 is smaller than the inner diameter of the telescopic sleeve 2 in the contracted state. When the battery housing 100 is in the contracted state (i.e., when the telescopic sleeve 2 is in the extended state), the upper end face of the feeding rod 12 can provide support for the battery housing 100, preventing the battery housing 100 from falling and ensuring the accuracy of the contracted position of the battery housing 100.

[0043] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings, and are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A battery case necking mechanism characterized by, The utility model relates to a battery shell necking device, including: First necking assembly, first necking assembly includes telescopic cover, be provided with the cavity for accommodating battery shell at least one end in telescopic cover, the hardness of telescopic cover is greater than the hardness of battery shell, the inside diameter of telescopic cover can change; Second necking assembly, second necking assembly includes first drive and necking piece, the necking hole is opened in the side close to telescopic cover, the axis of necking hole and the axis of telescopic cover coincide, first drive is connected with necking piece, first drive is used to drive necking piece reciprocating movement along the axis direction of telescopic cover, necking piece can move to working position, to make telescopic cover insert into necking hole, the inside diameter of telescopic cover reduces; Blanking assembly, blanking assembly includes second drive and blanking rod, the axis of blanking rod and the axis of necking piece coincide, second drive drives blanking rod moves along the axis direction, blanking rod can move to insert into telescopic cover and eject battery shell in telescopic cover; Base, first necking assembly and second necking assembly are arranged on base, telescopic cover includes at least two clamping claws, clamping claw and base movable connection, all clamping claws annularly arrange around the axis of necking hole, clamping claw can move along the direction perpendicular to the axis of necking hole; First necking assembly further includes fixed seat, fixed seat includes fixed plate, the side of fixed plate towards necking piece is provided with surrounding wall, clamping claw includes claw body and connecting plate, claw body is located in the annular area of surrounding wall, is provided with first mounting hole on surrounding wall, one end of connecting plate is fixed with claw body, the other end passes through first mounting hole and is connected with elastic element, elastic element always has the tendency of driving clamping claw to move away from the axis of necking hole, elastic element includes pin and spring, the end of connecting plate away from claw body is provided with turn -up, the axis direction of turn -up is parallel with telescopic cover, is provided with third mounting hole on turn -up, the outer side of fixed seat is provided with threaded hole, the end of pin is provided with stud, after pin passes through third mounting hole, the stud on pin is screwed into threaded hole, spring is sleeved on pin, and the two ends of spring are respectively abutted with fixed seat and turn -up.

2. The battery case necking mechanism of claim 1, wherein, The outer side of claw body is provided with guide inclined plane, one end of guide inclined plane is connected with the end surface of claw body, and the other end is inclined towards the side away from the axis of necking hole.

3. The battery case necking mechanism of claim 1, wherein, The end close to telescopic cover of necking hole is trumpet -shaped, gradually increases in diameter along the direction of necking piece pointing to telescopic cover.

4. The battery case necking mechanism of claim 1, wherein, Necking piece includes connecting shaft and sleeve head, the axis of connecting shaft and the axis of telescopic cover coincide, one end of connecting shaft and first drive connect, the other end and sleeve head connect, and necking hole is arranged in sleeve head.

5. The battery case necking mechanism of claim 1, wherein, The first necking assembly and the second necking assembly are arranged on the base, and the second necking assembly further comprises a guide sleeve fixedly connected with the base, and the guide sleeve is sleeved on the outer periphery of the necking piece.

6. The battery case necking mechanism of claim 1, wherein, The necking piece is provided with a second mounting hole, the blanking rod is slidingly arranged in the second mounting hole, the necking piece is provided with a first avoiding hole in communication with the second mounting hole, the length of the first avoiding hole extends along the axial direction of the blanking rod, and the second driving piece is connected with the blanking rod through the first avoiding hole.

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