Square laminated battery connecting piece bending tool

Abstract

The invention provides a square laminated battery connecting piece bending tool, and belongs to the technical field of battery manufacturing. The tool comprises a tool bottom plate, a first bending mechanism and a second bending mechanism, the first bending mechanism conducts first-time accurate angle (such as 60 degrees) bending on a connecting piece through a rotatable bending stress application handle and an angle limiting piece, and the second bending mechanism conducts second-time accurate angle (such as 60 degrees) bending on the connecting piece through a downward-pressing fixing base and a downward-pressing bending mechanism. Through an adjustable structure and mechanical limiting, the problems that the manual bending angle is inaccurate and the consistency is poor are solved, and the device has the advantages of being high in bending precision, good in compatibility, high in efficiency and the like, is particularly suitable for research, development, verification and small-batch production of batteries, and is suitable for large-scale production of the batteries. And the device can be conveniently integrated into an automatic production line.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a bending tool for multi-angle and step-by-step bending of connecting pieces in the production process of square laminated batteries. BACKGROUND

[0002] In the pilot and development stage of square laminated batteries, the connecting pieces are usually made of metal sheets with good electrical conductivity (such as nickel sheets and aluminum sheets). The bending of the connecting pieces is a key process. The specific process requirements are as follows: first, before ultrasonic welding, the flat connecting piece needs to be bent at an angle of about 60°; then, after the connecting piece and the battery cell are ultrasonically welded, the second bending is performed, which is bent by about 30°, so that the connecting piece finally forms a perpendicular state with the end face of the battery cell, so as to be reliably welded with the soft connection or other components of the battery. At the same time, the two-step welding operation can effectively avoid many interference problems in the production process.

[0003] At present, in the early stage of research and development verification, manual bending is often used. This method has many disadvantages: first, manual bending cannot guarantee the consistency of the angle, which affects the forming quality of the connecting piece; second, unstable bending effect will interfere with the subsequent ultrasonic welding process verification, which cannot accurately evaluate the advantages and disadvantages of the welding parameters, hindering the product development process; finally, for connecting pieces of different sizes and different bending angles, different special fixtures need to be made, which has high development cost and long development cycle; therefore, there is an urgent need for a fixture that is simple in structure, strong in compatibility, accurate in positioning and can realize step-by-step precise bending, to meet the rapid verification needs of multiple varieties and small batches in the battery development stage. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a square laminated battery connecting piece bending tool that can realize two-step precise bending, is compatible with connecting pieces of different sizes, is simple to operate, has low cost and is easy to automate.

[0005] The present application provides the following technical solutions: The utility model relates to a kind of square laminated battery connecting piece bending tooling, including tooling bottom plate, first bending mechanism and second bending mechanism set on the tooling bottom plate;The first bending mechanism includes product fixed column, bending force handle and angle limit piece, the product fixed column is equipped with the slot for connecting piece insertion and the end part backboard for limiting, the bending force handle is rotatably set in product fixed column bottom and is equipped with bending bearing head, the angle limit piece is used to limit the rotation angle of bending force handle;The second bending mechanism includes pressing fixed seat and pressing bending mechanism, the pressing fixed seat is equipped with the insertion slot for the battery with connecting piece insertion, the pressing bending mechanism includes the guide block that can move up and down and the pressing head set on guide block, pressing head is used to bend connecting piece inserted into insertion slot when guide block is pressed down; The advantage of the design is that two independent bending processes (first 60 ° bending and second 30 ° bending) are integrated on a tooling bottom plate, forming a complete solution, that is, through the rotary bending mode of the first bending mechanism and the vertical pressing mode of the second bending mechanism, the different bending requirements of the connecting piece before and after welding are accurately corresponded respectively, ensuring the consistency of the bending angle each time, fundamentally solving the problem of inaccurate manual bending angle mentioned in the background art, affecting process verification, and at the same time, the structural design also provides a basis for subsequent size compatibility and automatic expansion.

[0006] Preferably, the pressing bending mechanism further includes a guide column, an arch-shaped frame, a base, and an elastic return member; the guide column is fixed to the base, the guide block is sleeved outside the guide column and can slide along it, the elastic return member is arranged between the guide block and the base, and the arch-shaped frame is connected to the guide block to receive pressure to drive the guide block to compress the elastic return member.

[0007] The advantage of the design is that the guide column and the arch-shaped frame are added to ensure the stability and guiding accuracy of the pressing process, prevent the pressing head from deflecting, the elastic return member (such as a spring) is arranged to achieve automatic resetting of the pressing head, improve the efficiency of single operation, and provide conditions for realizing continuous and rapid automatic bending, while also ensuring that the bending is elastic contact to improve the stability of the bending effect, the design of the arch-shaped frame also makes the installation or pressure of the power source (such as a gas cylinder) more flexible, only needs to apply pressure from above, simplifies the external driving connection.

[0008] Preferably, a limit pin is arranged on the tooling bottom plate to limit the stroke of the guide block pressing down; The advantage of this design is that the limit pin is introduced to provide accurate mechanical hard limit, which corresponds to the function of the angle limiting screw, and ensures the accuracy of the first and second bending angles respectively. By simply adjusting or replacing the limit pin with different heights, the angle of the second bending (such as 30°) can be accurately controlled, ensuring the forming quality of the final 90° vertical surface, which is the key feature to achieve consistent bending angle.

[0009] Preferably, the position of the end rest is adjustable to change the direction of the first bending; The advantage of this design is that the position of the end rest is adjustable, which greatly enhances the flexibility and compatibility of the tooling. It allows the tooling to adapt to different bending directions (e.g., left or right bending), meeting the requirements of different battery structure designs for the orientation of the connecting piece, embodying the "compatible with more sizes" feature emphasized in the invention content.

[0010] Preferably, the end of the pressing head is provided with a bearing body; The advantage of this design is that the bearing body is provided at the end of the pressing head, converting sliding friction during bending into rolling friction. This can significantly reduce the resistance during bending, making the bending action smoother and requiring less driving force. At the same time, it reduces the wear and tear on the surface of the connecting piece, protecting the workpiece quality and improving the surface quality of the bending forming.

[0011] Preferably, two groups of symmetrically distributed pressing heads are provided on the guide block, and correspondingly, two groups of symmetrically distributed insertion slots are provided on the lower pressing fixed seat; The advantage of this design is that it simultaneously completes the bending of two connecting pieces in one action. This greatly improves production efficiency, especially for symmetrical structures of the battery, which directly responds to the demand for "one-time multi-piece bending forming" in the background technology, and is the core means to improve batch operation efficiency.

[0012] Preferably, the top end of the end rest is provided with a positioning hole for cooperation with the automatic clamping jaw; The advantage of this design is that the cooperation of the positioning hole and the positioning column provides a precise positioning reference for the up and down operation of the automatic clamping jaw. This ensures that the connecting piece can be accurately and repeatedly placed into the slot of the product fixing column, which is a prerequisite for high-precision and high-reliability automatic production, effectively avoiding bending failure or equipment damage due to inaccurate positioning.

[0013] Preferably, the tooling base plate is made of 45 steel, the bending force handle and the product fixing column are made of SUS304 stainless steel, and the bending bearing head and the pressing head are made of Cr12 die steel; The advantage of the design is that the material of the key components is selected, and the most suitable material is selected according to the functional requirements of different components (such as the bottom plate needs comprehensive mechanical properties, the movable component needs wear resistance, and the fixed component needs good machinability). While ensuring the overall strength, hardness and wear resistance of the tool, the processing difficulty and manufacturing cost are optimized, and the service life and economy of the tool are ensured.

[0014] Preferably, the first bending mechanism is provided with a clamping jaw device for automatically taking and placing the connecting piece; The advantage of the design is that the automatic feeding and discharging device (clamping jaw device) is combined with the first bending mechanism, and manual operation is upgraded to automatic operation, which greatly improves the production efficiency of the first bending process, reduces labor cost and labor intensity, and reduces the uncertainty of manual operation, ensures the stability of the production rhythm, and in specific implementation, the clamping jaw unit can be driven by the X-direction linear module to move above the notch, and the connecting piece is inserted into the notch under the driving of the Z-direction linear module. The positioning column on the clamping jaw unit and the positioning hole on the end rest are inserted to guide and position when the connecting piece is clamped on the upper end of the connecting piece, and after the connecting piece is bent for the first time, the connecting piece is clamped to rise to separate from the notch, and then a new set of connecting pieces to be bent is inserted from the top of the notch. When the positioning hole on the top of the end rest and the positioning hole on the clamping jaw are aligned, the initial insertion positioning can be completed, and the feeding and discharging in a pipeline manner can be realized to provide processing efficiency.

[0015] Preferably, the second bending mechanism is provided with a conveying line, a push cylinder one and a push cylinder two, the conveying line is used for conveying the battery cell to be bent close to the lower pressing fixed seat, the push cylinder one and the push cylinder two are arranged on both sides of the conveying line, the push cylinder one is used for pushing the battery cell into the insertion slot, and the push cylinder two is used for pushing the bent battery cell away from the insertion slot. The tool of the present application under this scheme is the highest embodiment of automation, and specifically describes how to realize full-process automation through the conveying line, the push cylinder and the linear module, which builds a complete automatic production unit. The X linear module, the Z linear module and the clamping jaw unit realize automatic taking and placing of materials and accurate positioning in the first process; the cooperation of the conveying line and the push cylinder one and the push cylinder two realizes automatic conveying, positioning, insertion and ejection after bending of the battery cell in the second process, the scheme completely realizes the flow line type feeding and discharging, reduces manual intervention to the minimum, maximally improves overall processing efficiency and production automation level, and is a concentrated embodiment of beneficial effects of the application. In specific operation, the battery cell can be conveyed to one side of the insertion slot through the conveying line, then the push cylinder one on the side of the conveying line can linearly push the battery cell, so that the battery cell moves towards the insertion slot, so that the connecting piece is inserted into the insertion slot, and after bending, the push cylinder two can push the battery cell, so that the battery cell moves away from the insertion slot, so that the connecting piece is separated from the insertion slot and the conveying line, and space for subsequent battery cell conveying is left, so as to convey the subsequent battery cell to the push cylinder one and the push cylinder two, so as to complete the flow line type feeding and discharging of the second bending process part.

[0016] The beneficial effects of the application are: 1. High precision and good consistency: the tooling of the application strictly controls the bending angle through mechanical limiting (angle limiting piece, limiting pin), completely solves the angle error problem of manual bending, ensures the consistency of each bending, and provides a reliable foundation for process verification; 2. Strong compatibility and high flexibility: the tooling of the application can change the bending direction by adjusting the position of the end rest plate, and can adapt to the bending needs of connecting pieces of different sizes by replacing fixed columns of different sizes or adjusting the limiting piece, and is especially suitable for rapid verification of multiple varieties and small batches in the battery research and development stage; 3. Efficiency is significantly improved: the second bending mechanism in the tooling of the application can be designed as a double station (symmetrically distributed lower press head and insertion slot), and one action can complete the bending of two connecting pieces at the same time, and more importantly, the tooling structure is convenient for integration with automatic equipment (such as clamping jaws, conveying lines and push cylinders), realizes full-automatic flow line operation, and greatly improves production efficiency; 4. Simple structure and low cost: the tooling of the application has a delicate structure design, clear functions of each component, simple machining and manufacturing, and reasonable material selection (such as 45 steel, SUS304 and Cr12) according to the performance requirements (such as strength and wear resistance) of different components, which effectively controls the manufacturing cost while ensuring the service life; 5. Friendly operation and protection of workpieces: the bearing body is arranged at the end of the lower press head, which changes sliding friction into rolling friction, saves more labor in operation, avoids scratching the surface of the connecting piece, and improves product quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation on the application. In the drawings: Figure 1is a structural schematic diagram of the present application; Figure 2 is a structural schematic diagram of the first bending mechanism; Figure 3 is Figure 2 is a structural schematic diagram of the winning bending bearing head when it is split from the bending force handle; Figure 4 is a structural schematic diagram of the split of the lower pressing fixed seat and the lower pressing bending mechanism; Figure 5 is a structural schematic diagram of the lower pressing bending mechanism; Figure 6 is an original structural schematic diagram of the connecting piece; Figure 7 is a structural schematic diagram of the connecting piece after the first bending; Figure 8 is a structural schematic diagram of the connecting piece after the second bending; Markings in the figure: 1, tool base plate; 100, first bending mechanism; 200, second bending mechanism; 2, product fixed column; 21, notch; 22, end rest; 23, positioning hole; 3, bending force handle; 31, bending bearing head; 4, angle limiting piece; 5, lower pressing fixed seat; 51, insertion slot; 6, lower pressing bending mechanism; 61, guide column; 62, guide block; 63, base; 64, arched frame; 65, lower pressing head; 651, bearing body; 66, elastic reset piece; 7, limiting pin; 8, connecting piece; 9, battery cell. DETAILED DESCRIPTION

[0018] Example 1 This example shows the basic structure of the tooling and the manual operation method.

[0019] As Figure 1 shown, the square-shaped laminated battery connecting piece bending tool of the present application mainly includes a tool base plate 1, a first bending mechanism 100 and a second bending mechanism 200 arranged on the tool base plate 1, the first bending mechanism 100 is used for performing the first 60° bending on the single connecting piece 8, as Figure 2 shown, it is mainly composed of a product fixed column 2, a bending force handle 3 and an angle limiting piece 4 (such as a limiting screw); The product fixed column 2 is centrally provided with a notch 21 for inserting the connecting piece 8, and the top end is connected with an end rest 22 for axially limiting the connecting piece 8, the bending force handle 3 is rotatably sleeved at the bottom of the product fixed column 2 through a bearing body or a shaft sleeve, and the bending bearing head 31 is installed thereon, as Figure 3 shown; When operating, the flat connecting piece 8 (state as Figure 6) inserted into the slot 21 with one end close to the end rest 22, the bending force handle 3 is manually pulled to rotate around the product fixing column 2, the bending bearing head 31 rotates and presses the connecting piece 8 to bend around the edge of the slot 21, and stops when the handle is rotated to the position blocked by the angle limiting piece 4, at this time, the connecting piece is accurately bent by 60° (as shown in Figure 7 ), after completion, the connecting piece is taken out and ultrasonic welded to the battery cell 9, the second bending mechanism 200 is used for second 30° bending of the connecting piece welded on the battery cell 9, as shown in Figure 4 and Figure 5 , which mainly comprises a downward pressing fixing seat 5 and a downward pressing bending mechanism 6, The downward pressing fixing seat 5 is provided with an insertion slot 51, the downward pressing bending mechanism 6 comprises a guide column 61, a guide block 62 which can slide along the guide column, a base 63, an arch-shaped frame 64 connected above the guide block 62 and a downward pressing head 65 arranged at the bottom of the guide block 62, an elastic return piece 66 (such as a spring) is sleeved on the guide column 61 and located between the guide block 62 and the base 63, the tool bottom plate 1 is provided with a limiting pin 7 which limits the downward pressing stroke of the guide block 62, and the end of the downward pressing head 65 is preferably provided with a bearing body 651, in operation, the battery cell 9 with the connecting piece is moved to insert the connecting piece into the insertion slot 51, the arch-shaped frame 64 is pressed downward by an external driving device (such as a pneumatic cylinder) or manually, the guide block 62 and the downward pressing head 65 are pressed downward along the guide column 61, the bearing body 651 of the downward pressing head 65 presses the connecting piece to bend around the end of the insertion slot 51, when the guide block 62 is blocked by the limiting pin 7, the bending angle is exactly 30°, which is superimposed with the first bending, so that the connecting piece finally presents a 90° vertical state (as shown in Figure 8 ), after the pressure is removed, the elastic return piece 66 pushes the guide block 62 to reset, and then the battery cell can be taken out, Embodiment 2; This embodiment is a further limitation based on embodiment 1, the square-shaped lamination battery connecting piece bending tool of the application integrates an automatic unit to realize full-automatic production, for the first bending mechanism 100, an automatic clamping jaw device (not shown in the figure, but can be understood) is configured, which can move under the driving of X and Z linear modules, the clamping jaw is provided with a positioning column which can cooperate with the positioning hole 23 at the top of the end rest 22 to realize accurate positioning, in operation, the clamping jaw automatically takes the material to accurately insert the connecting piece 8 into the slot 21; after the bending is completed, the finished product is automatically taken out to realize the line production type feeding and discharging, for the second bending mechanism 200, a conveying line, a pushing cylinder one and a pushing cylinder two (not shown in the figure, only the conveying direction A of the conveying line, the pushing direction B of the pushing cylinder one and the pushing direction C of the pushing cylinder two are shown) are configured, the conveying line is used for conveying the battery cell 9 to the working position, the pushing cylinder one is located on one side of the conveying line to push the battery cell to insert the connecting piece into the insertion slot 51, after the bending is completed, the pushing cylinder two acts to push the battery cell away from the insertion slot, and the battery cell is conveyed away by the conveying line, so as to realize the full-automatic feeding and discharging and bending of the second process.

[0020] The working principle of the present application is: The working principle of the present application is based on the combination of step forming and mechanical limiting, which decomposes the required 90° final angle of the connecting piece into 60° and 30° two times of bending, and is respectively completed by two independent mechanisms arranged in the tooling bottom plate; the first bending mechanism utilizes rotary motion and circular arc trajectory, rotates the bearing body head driven by the handle, makes the connecting piece plastically bend around the slot edge of the fixed column, and realizes accurate control of 60° angle through the angle limiting piece; the second bending mechanism utilizes linear downward motion, presses the connecting piece welded on the battery cell into the insertion slot of the fixed seat through the downward head, makes it bend again around the insertion slot edge, and controls the downward stroke through the limiting pin, accurately realizes the complementary bending of 30° angle; the two mechanisms work together to ensure the high-precision forming of the final 90° vertical plane, and the introduction of the automatic unit converts the manual operation steps into continuous mechanical motion through program control, realizes efficient and stable automatic production.

[0021] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or equivalently replace some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A bending fixture for square stacked battery connecting pieces, characterized in that, The fixture includes a base plate (1), a first bending mechanism (100) and a second bending mechanism (200) mounted on the base plate (1); the first bending mechanism (100) includes a product fixing post (2), a bending force-applying handle (3), and an angle limiting component (4). The product fixing post (2) has a slot (21) for inserting a connecting piece (8) and an end plate (22) for limiting. The bending force-applying handle (3) is rotatably fitted onto the bottom of the product fixing post (2) and has a bending bearing head (31). The angle limiting component (4) is... The positioning element (4) is used to limit the rotation angle of the bending force-applying handle (3); the second bending mechanism (200) includes a pressing fixing seat (5) and a pressing bending mechanism (6). The pressing fixing seat (5) is provided with a slot (51) for inserting the battery cell (9) with the connecting piece (8). The pressing bending mechanism (6) includes a guide block (62) that can move up and down and a pressing head (65) provided on the guide block (62). The pressing head (65) is used to bend the connecting piece (8) inserted into the slot (51) when it is pressed down with the guide block (62).

2. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The downward bending mechanism (6) further includes a guide post (61), an arched frame (64), a base (63), and an elastic reset member (66); the guide post (61) is fixed on the base (63), the guide block (62) is sleeved on the guide post (61) and can slide along it, the elastic reset member (66) is disposed between the guide block (62) and the base (63), and the arched frame (64) is connected to the guide block (62) to bear pressure and drive the guide block (62) to compress the elastic reset member (66).

3. The square stacked battery connecting piece bending fixture according to claim 2, characterized in that, The tooling base plate (1) is provided with a limiting pin (7) to limit the downward stroke of the guide block (62).

4. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The position of the end plate (22) is adjustable to change the direction of the first bend.

5. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The end of the pressure head (65) is provided with a bearing body (651).

6. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The guide block (62) is provided with two sets of symmetrically distributed pressing heads (65), and correspondingly, the pressing fixing seat (5) is provided with two sets of symmetrically distributed slots (51).

7. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The top of the end plate (22) is provided with a positioning hole (23) for cooperating with an automated gripper.

8. The square stacked battery connecting piece bending fixture according to claim 1, characterized in that, The tooling base plate (1) is made of 45 steel, the bending force-applying handle (3) and the product fixing column (2) are made of SUS304 stainless steel, and the bending bearing head (31) and the lower pressure head (65) are made of Cr12 mold steel.

9. A bending fixture for square stacked battery connecting pieces according to any one of claims 1 to 8, characterized in that, The first bending mechanism (100) is equipped with a gripper device for automatically picking up and placing the connecting piece (8).

10. A bending fixture for square stacked battery connecting pieces according to claim 9, characterized in that, The second bending mechanism (200) is equipped with a conveyor line, a pusher cylinder one and a pusher cylinder two. The conveyor line is used to convey the battery cell (9) to be bent close to the lower pressure fixing seat (5). The pusher cylinder one and the pusher cylinder two are arranged on both sides of the conveyor line. The pusher cylinder one is used to push the battery cell (9) into the slot (51). The pusher cylinder two is used to push the bent battery cell (9) away from the slot (51).

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