A battery steel shell riveting device and a riveting method

Abstract

The application relates to a battery steel shell riveting device which comprises a pressure mechanism and a riveting jig, the riveting jig comprises a positioning column, a fixing seat and a base, the positioning column is vertically fixed on the fixing seat, the base is located below the fixing seat, an elastic structure is arranged between the fixing seat and the base, a hollow part is arranged in the positioning column, a pole is arranged in the hollow part, the pole extends into the base through the positioning column from the top of the positioning column, the circumferential surface of the pole is provided with an outwardly protruding annular protrusion, the circumferential surface of the pole is provided with a stepped hole matched with the protrusion at the positions above and below the protrusion, gaps are formed between the circumferential surfaces of the pole above and below the protrusion and the inner circumferential surface of the positioning column, springs are sleeved with the pole at the positions of the gaps, the springs abut against the protrusion and the positioning column respectively, and the pole and the positioning column are elastically connected through the protrusion and the springs.

Description

Technical Field

[0001] This invention relates to the field of riveting equipment, and more specifically to a riveting device and method for riveting a battery steel shell. Background Technology

[0002] Riveting is a process that uses a sudden high-pressure process to create an internally embedded dot with a certain tensile and shear strength by cold extrusion deformation of the sheet material itself. This allows two or more sheets of different materials and thicknesses to be connected.

[0003] Currently, in the battery manufacturing process, the top and interior of the battery steel casing are equipped with outer and inner annular components, respectively. These two parts need to be riveted together through a circular hole on the top of the battery steel casing. In existing technology, most battery steel casing riveting equipment directly fixes the product to be riveted onto a fixture, and then applies pressure to the product through a pressure head to complete the riveting. At this time, the fixture is often subjected to great pressure, which can easily cause damage to the fixture. Therefore, the service life of existing fixtures is often short, requiring frequent replacement, which greatly increases the processing cost. In addition, when the product is directly subjected to the huge instantaneous pressure of riveting, it is easy to cause deformation and damage to the product. Therefore, there is a need for a riveting device and its usage method that can minimize damage to the fixture and the product and provide a certain degree of protection.

[0004] To address the problems existing in the prior art, this invention provides a riveting device and method for battery steel shells that features low workpiece stress, long service life, and high processing efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a riveting device and method for battery steel shells that provides low workpiece stress, long service life, and high processing efficiency.

[0006] A battery steel shell riveting device includes a pressure mechanism and a riveting fixture. The pressure mechanism includes a driving component, a riveting driving block, and a riveting head. The top of the riveting driving block is connected to the driving component, and the riveting head is fixed to the bottom of the riveting driving block. The riveting fixture is located below the riveting head. The riveting fixture includes a positioning post, a fixing seat, and a base. The positioning post is vertically fixed to the fixing seat, and the base is located below the fixing seat. An elastic structure is provided between the fixing seat and the base. The positioning post has a hollow portion, and a pole is provided inside the hollow portion. The pole extends from the top of the positioning post through the positioning post and into the base. The circumferential surface of the pole has an outwardly protruding annular protrusion. The inner circumferential surface of the positioning post has a stepped structure that cooperates with the protrusion at the positions above and below the protrusion, so that a gap is formed between the circumferential surface of the pole on the upper and lower sides of the protrusion and the inner circumferential surface of the positioning post. A spring is sleeved on the pole at the position of the gap. The spring abuts against the protrusion and the positioning post respectively, and the pole and the positioning post are elastically connected through the protrusion and the spring.

[0007] In the above technical solution, the battery steel shell riveting device of the present invention includes a pressure mechanism and a riveting fixture. The riveting fixture consists of a driving component, a riveting driving block, and a riveting head connected in sequence. The top of the driving block is connected to the driving component, and the bottom is connected to the riveting head. The driving component provides driving force, enabling the riveting driving block to move vertically and horizontally, and driving the riveting head at the bottom to complete the lifting and pressing actions. The riveting fixture is located at the bottom of the riveting head and includes a positioning post, a fixed seat, and a base. The positioning post is fixed perpendicularly to the fixed seat, and the base is located below the fixed seat. Furthermore, an elastic structure is provided between the fixed seat and the base, which provides a certain elastic force when the fixed seat at the top moves vertically. Currently, during the riveting process, the product to be riveted needs to be fixed on the fixture, and then pressure is applied to the product by the pressure head to complete the riveting. During riveting, the fixture is often subjected to significant pressure, which can easily damage it. Therefore, in existing technologies, the service life of the fixture is often short, requiring frequent replacement, which significantly increases processing costs. This invention adds a base structure to the bottom of the riveting fixture in addition to the fixed seat, and sets an elastic structure between the fixed seat and the base. This allows the positioning pin and the fixed seat to be cushioned by the elastic force provided by the elastic structure when the riveting head presses down on the fixture during riveting, preventing them from directly contacting other parts below. This avoids direct contact between the fixed seat and a rigid plane, preventing the riveting fixture from directly bearing the pressure from the riveting head, effectively protecting the overall structure of the riveting fixture, greatly extending its service life, effectively reducing fixture wear, and lowering processing costs.The positioning post also contains an electrode post with a hollow section through which the electrode post passes. The electrode post extends from the top of the positioning post through the hollow section to the bottom of the base. A ring of outwardly protruding annular bumps is provided on the circumferential surface of the electrode post. Stepped holes that mate with the bumps are located on the upper and lower sides of the annular bumps on the circumferential surface of the electrode post, creating a gap around the electrode post between the electrode post and the positioning post on the upper and lower sides of the bumps. A spring is fitted onto the electrode post at the gap, and the spring abuts against the bumps and the positioning post within the gap, creating an elastic connection between the electrode post and the positioning post. During the riveting process, the battery steel shell is fitted onto the positioning post of the riveting fixture. When the riveting head presses down, the battery... When riveting the top of the steel shell, the riveting head first contacts the upper surface of the battery steel shell fitted onto the riveting fixture. Then, during the downward pressing process, the terminal post and the positioning post abut against each other and move downwards together. During riveting, the terminal post and the annular part at the top of the battery steel shell receive direct pressure from the riveting head, while the remaining parts only indirectly receive a portion of the thrust from the riveting head. Furthermore, the positioning post and the terminal post, through the elastic force provided by the internal spring, can provide a certain buffering effect, further reducing the instantaneous pressure received by the battery steel shell fixed to the positioning post. This structural design can reduce the pressure received by the battery steel shell product during processing, prevent deformation or damage during processing, and effectively protect the overall shape and structure of the battery steel shell.

[0008] Furthermore, the elastic structure includes guide posts and elastic elements. The edge of the fixing seat is provided with multiple fixing holes, and each of the multiple fixing holes is provided with a guide post. The fixing seat is slidably connected to the guide posts through the fixing holes. Each guide post is fitted with an elastic element, which abuts against the top fixing seat and provides elastic force. The bottom of the guide post is fixedly connected to the base.

[0009] In the above technical solution, the elastic structure includes guide posts and elastic elements. Multiple corresponding fixing holes are provided at the edges of both the base and the fixed seat. Guide posts are installed in each fixing hole, and the fixed seat and guide posts form a sliding connection, allowing the fixed seat to slide up and down along the guide posts. The base is fixed to the bottom of the guide posts. Furthermore, an elastic element is sleeved on the guide posts, and this elastic element elastically abuts against the top fixed seat, providing a certain elastic force for the top fixed seat to slide up and down. The connection is made via guide posts, and the elastic element is sleeved on the guide posts. During the riveting process, when the riveting head presses down on the riveting fixture, the positioning post and the fixed seat move down along the guide post, allowing them to be subjected to the elastic force provided by the elastic element to the fixed seat. This provides a certain buffer to the positioning post and the connected fixed seat, and prevents the positioning post and the fixed seat from directly contacting other parts below when the riveting is fully pressed down. This avoids the fixed seat directly contacting the rigid plane and prevents the riveting fixture from directly bearing the pressure brought by the riveting head, effectively protecting the overall structure of the riveting fixture, greatly extending the service life of the riveting fixture, effectively reducing fixture wear, and lowering processing costs.

[0010] Furthermore, a buffer structure is provided between the fixed seat and the base. The buffer structure includes a positioning plate and a buffer plate arranged sequentially from top to bottom. A protruding positioning block is provided on one side of the positioning plate. The positioning plate and the buffer plate have through holes at their positions relative to the pole post for the pole post to pass through. The edges of the positioning plate and the buffer plate are also provided with through holes at their positions relative to the guide post for the guide post to pass through. The positioning plate and the buffer plate are sleeved on the pole post and the guide post through the provided through holes. The bottom of the spring on the side below the protrusion on the pole post elastically abuts against the positioning plate. The elastic element sleeved on the guide post is located between the fixed seat and the positioning plate and elastically abuts against the fixed seat and the positioning plate respectively.

[0011] In the above technical solution, a buffer structure is further provided between the fixed base and the base. The buffer structure includes a positioning plate and a buffer plate. The positioning plate is located above the buffer plate. A protruding positioning block is provided on one side of the positioning plate. The positioning block has holes for positioning, which are used for positioning and limiting during riveting. The length of the buffer plate is greater than that of the positioning plate to reserve some floating space and prevent collisions due to turntable accuracy errors when transporting the battery steel shell to the fixture. The edges of the positioning plate and the buffer plate are provided with through holes that cooperate with the guide post, and the center position is provided with a through hole for the electrode post to pass through. The positioning plate and the buffer plate are fixed by the guide post and the electrode post. The fixed through hole has a groove inside, allowing the positioning plate to abut against the spring on one side below the protrusion inside the pole post. This provides an upward buffering force to the pole post during riveting, reducing the instantaneous pressure on the battery steel shell on the positioning post and preventing excessive stress that could cause deformation or damage. Furthermore, the elastic elements fitted onto the guide post abut against the bottom of the fixing seat and the top of the positioning plate, forming an elastic connection between them. During riveting, when the fixing seat and pole post move downwards under the pressure of the riveting head, this provides a buffering effect and prevents the bottom of the fixing seat from directly contacting a rigid plane, thus preventing damage to the fixture and effectively protecting it.

[0012] Furthermore, the top of the positioning post has rivet holes distributed in a stepped manner, and a guide hole is opened at the center of the rivet holes. The top of the pole post is provided with a protruding guide post that cooperates with the guide hole, and the guide post is installed inside the guide hole.

[0013] In the above technical solution, the top of the positioning post has a stepped riveting hole, which mates with the inner annular part of the battery steel shell that needs to be riveted. A guide hole is provided at the center of the riveting hole. The top of the pole inside the positioning post is provided with a guide post that mates with the guide hole. The guide post is inserted into the guide hole, and in the initial state, the bottom plane of the guide post is lower than the bottom plane of the guide hole. This ensures that during the riveting process, after the riveting head compacts and tightens the annular part, the pole then contacts the positioning post and moves downward together, leaving a distance for the riveting head to compact and tighten the annular part, ensuring that there are no gaps between the top annular parts and guaranteeing the riveting effect.

[0014] Furthermore, the positioning post has multiple vent holes at the top edge of its side surface, and multiple parallel weight-reducing grooves on its side surface.

[0015] In the above technical solution, the top edge of the side of the positioning post is provided with multiple vent holes, which can facilitate ventilation to prevent the battery steel shell from being difficult to remove after being sleeved on the positioning post. The side of the positioning post is provided with multiple parallel weight-reducing grooves, and at least one row of weight-reducing grooves is provided. The weight-reducing grooves can reduce the weight of the fixture and reduce a certain load.

[0016] Furthermore, the pressure mechanism also includes a first base and a second base distributed in parallel, the first base being located above the second base, and a plurality of fixing columns being provided between the first base and the second base, and being connected and fixed through the plurality of fixing columns.

[0017] In the above technical solution, the pressure mechanism includes a first base and a second base arranged in parallel vertically. The first base and the second base are spaced apart by a certain distance to provide space for the installation of other structures. The edges of the first base and the second base are provided with multiple through holes for the fixing column to pass through. The fixing column connects and fixes the first base and the second base through the through holes.

[0018] Furthermore, the driving member is located on the first base, the bottom of the riveting driving block passes through the first base, and the riveting fixture is located between the first base and the second base.

[0019] In the above technical solution, the driving component is fixed on the first base, the bottom of the riveting driving block passes through the first base, and the riveting driving block can move up and down through the driving component to drive the riveting head fixed at the bottom to achieve the action of lifting and pressing. The riveting fixture is located between the first base and the second base and is fixed directly below the riveting head.

[0020] Furthermore, a lower hard limiting structure is provided below the riveting fixture. The lower hard limiting structure is fixed on the second base. The lower hard limiting structure includes a top limiting block, which is located below the base at the bottom of the riveting fixture.

[0021] In the above technical solution, a lower hard limiting structure is provided on the second base at the bottom of the riveting fixture. The lower hard limiting structure includes a limiting block provided at the top. The base of the riveting fixture is located directly above the limiting block. During the riveting process, the limiting block provides a rigid plane to limit the downward moving pole and base. After the pole and base both contact the limiting block, the annular part at the top of the battery steel shell is riveted, thus completing the riveting process of the battery steel shell.

[0022] Furthermore, the riveting fixture is also provided with a clamping device and a detection device on its side. The clamping device is fixed on the second base, and the clamping device has a clamping structure on the side near the riveting fixture. The clamping structure extends out and is located on both sides of the riveting fixture. The detection device is fixed on the second base, and the top of the detection device has a protruding probe in the direction near the positioning post of the riveting fixture.

[0023] In the above technical solution, the second base is also provided with a clamping device. The clamping device is located on the side of the riveting fixture, and has an extended clamping structure on the side near the riveting fixture. The clamping structure is located on both sides of the riveting fixture and can clamp the battery steel shell fixed on the riveting fixture. After riveting is completed, it prevents the battery steel shell from being taken away when the riveting head moves upward to reset. The second base is also provided with a detection device. The top of the detection device has a protruding probe near the positioning post of the riveting fixture. The detection device can detect whether the riveted battery steel shell is still on the fixture, thereby determining whether the next riveting can begin, which greatly improves the processing efficiency.

[0024] A method for riveting a battery steel casing includes the following steps: S1: First, the inner annular part that needs to be riveted inside the battery steel shell is installed in the riveting hole at the top of the positioning post of the riveting fixture. Then, the battery steel shell that has been preliminarily assembled in the previous station and the outer annular part that needs to be riveted are installed on the positioning post of the riveting fixture by a robot arm, and then transported to the area below the riveting head. In this invention, the annular part that needs to be riveted on the battery steel shell includes an outer annular part and an inner annular part. The inner annular part is first installed in the riveting hole at the top of the positioning post. After the outer annular part and the battery steel shell are basically assembled, they are installed on the positioning post by a robot arm. Then, the riveting fixture is transported to the area below the riveting head of the pressure device by a turntable or other mechanism, ready for riveting work.

[0025] S2: Start the driving component, which drives the riveting driving block to move downward, causing the riveting head fixed at the bottom of the riveting driving block to press down; in the above steps, the driving component drives the riveting driving block to move downward, and causes the riveting head at the bottom to press down.

[0026] S3: The riveting head contacts the top surface of the battery steel shell and presses down. The positioning post and the fixing seat retract downwards together. At this time, the elastic element sleeved on the guide post provides elastic force, which provides a certain buffering effect on the fixing seat. At the same time, the spring sleeved on the pole at the gap begins to compress under the influence of the downward movement of the positioning post. In the above steps, after the riveting head contacts the top of the battery steel shell product, the positioning post receives pressure and begins to move downwards, which drives the fixing seat to move downwards together. At this time, the elastic element on the guide post begins to contract, which can provide a certain buffering effect on the fixing seat and prevent excessive instantaneous pressure. At the same time, the spring sleeved on the pole inside the positioning post also begins to contract, and the pole begins to move upwards relative to the externally wrapped positioning post.

[0027] S4: When the riveting head continues to press down until the shoulder of the guide post at the bottom contacts the positioning post, the positioning post and the pole post retract downward together under the drive of the positioning post. At this time, the riveting fixture moves downward as a whole under the pressure of the riveting head. In the above steps, the pole post inside the positioning post moves upward relative to the positioning post until the shoulder of the guide post at the top of the pole post contacts and abuts against the bottom plane of the guide hole of the positioning post. Then, the pole post begins to retract downward together with the positioning post under the drive of the positioning post. At this time, the riveting fixture moves downward as a whole under the pressure of the riveting head. The spring fixed on the pole post can provide a certain buffering effect when the shoulder of the guide post contacts the bottom plane of the guide hole, reducing the instantaneous pressure and effectively protecting the structure of the riveting fixture and the battery steel shell product.

[0028] S5: After the bottom surfaces of the pole and the base both contact the limiting block at the top of the lower hard limiting structure, the annular part at the top of the battery steel shell is riveted, and the riveting of the battery steel shell product is completed; in the above steps, after the bottom surfaces of the pole and the base both contact the limiting block at the top of the lower hard limiting structure, the annular part at the top of the battery steel shell is riveted, and the riveting of the battery steel shell product is completed.

[0029] S6: Activate the clamping device to clamp the riveted product, and then drive the riveting drive block to move upward through the drive component. After the riveting drive block resets, release the clamping structure of the clamping device. In the above steps, after the riveting is completed, the clamping structure on the clamping device clamps the riveted battery steel shell product to prevent the product from being pulled out when the upper pressure head resets upward.

[0030] S7: Start the detection device. Through the sensing function of the detection device, detect whether the battery steel shell product is still on the riveting fixture. After the detection is completed, repeat the riveting operation. In the above steps, the detection device can detect whether the product is still on the riveting fixture. After confirmation, the product is transported to the next station by the turntable mechanism and the next riveting operation begins. This ensures the normal operation of the automated riveting process and improves processing efficiency.

[0031] Compared with the prior art, the battery steel shell riveting device and riveting method of the present invention have the following beneficial effects: The workpiece experiences low stress. The positioning post in this invention contains an electrode post, and at the point where it mates with the positioning post, a raised annular protrusion is provided. This protrusion creates a gap around the electrode post on both its upper and lower sides. A spring is fitted onto the electrode post at the gap, and the spring abuts against the protrusion and positioning post within the gap, creating an elastic connection between the electrode post and the positioning post. During riveting, the spring provides a buffering effect, reducing the instantaneous pressure on the battery steel shell fixed to the positioning post. This invention reduces the pressure on the battery steel shell during processing, preventing deformation or damage and effectively protecting the overall shape and structure of the battery steel shell.

[0032] With a long service life, this invention adds a base structure to the bottom of the riveting fixture in addition to the fixed seat, and an elastic structure is set between the fixed seat and the base. When the riveting head presses down on the riveting fixture during the riveting process, the positioning post and the fixed seat move down along the guide post and are subjected to the elastic force provided by the elastic element to the fixed seat. This provides a certain buffer to the positioning post and the connected fixed seat. Moreover, when the riveting is fully pressed down, the positioning post and the fixed seat will not directly contact other parts below, avoiding direct contact between the fixed seat and the rigid plane. This prevents the riveting fixture from directly bearing the pressure brought by the riveting head, effectively protecting the overall structure of the riveting fixture, greatly extending the service life of the riveting fixture, effectively reducing fixture wear, and lowering processing costs.

[0033] Third, the processing efficiency is high. During the riveting process, the present invention adds a clamping device and a detection device. The clamping device can prevent the battery steel shell product from being pulled away from the riveting fixture by the riveting head after riveting is completed. The detection device can detect the relative state of the battery steel shell product and the riveting fixture after riveting is completed, ensuring that the battery steel shell product is still on the riveting fixture. The design of the above-mentioned auxiliary devices can effectively avoid the problems that may affect the riveting cycle after riveting is completed, further ensuring the automated operation of the riveting cycle and greatly improving the efficiency of automated processing. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the structure of a battery steel shell riveting device according to one embodiment.

[0035] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0036] Figure 3 This is a schematic diagram of the riveting fixture in the battery steel shell riveting device of the present invention.

[0037] Figure 4 for Figure 3 Top view of the riveting fixture.

[0038] Figure 5 for Figure 3 A cross-sectional view of the riveting fixture. Detailed Implementation

[0039] The battery steel shell riveting device and riveting method of the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0040] Reference Figures 1 to 5In a non-limiting embodiment of the present invention, a battery steel shell riveting device includes a pressure mechanism 10 and a riveting fixture 20. The pressure mechanism 10 includes a driving member 13, a riveting driving block 14, and a riveting head 15. The top of the riveting driving block 14 is connected to the driving member 13, and the riveting head 15 is fixed to the bottom of the riveting driving block 14. The riveting fixture 20 is located below the riveting head 15. The riveting fixture 20 includes a positioning post 21, a fixing seat 22, and a base 23. The positioning post 21 is vertically fixed to the fixing seat 22, and the base 23 is located below the fixing seat 22. An elastic structure is provided between the fixing seat 22 and the base 23. The positioning post 21 has a hollow portion inside. An electrode post 25 is provided, which extends from the top of the positioning post 21 through the positioning post 21 and into the base 23. The circumferential surface of the electrode post 25 is provided with an outwardly protruding annular protrusion 253. The inner circumferential surface of the positioning post 21 is provided with a stepped structure that cooperates with the protrusion 253 at the positions above and below the protrusion 253, so that a gap is formed between the circumferential surface of the electrode post 25 located on the upper and lower sides of the protrusion 253 and the inner circumferential surface of the positioning post 21. A spring 254 is sleeved on the electrode post 25 at the position of the gap. The spring 254 abuts against the protrusion 253 and the positioning post 21 respectively, and the protrusion 253 and the spring 254 form an elastic connection between the electrode post 25 and the positioning post 21. In this embodiment, the battery steel shell riveting device of the present invention includes a pressure mechanism 10 and a riveting fixture 20, wherein the riveting fixture 20 is composed of a driving component 13, a riveting driving block 14 and a riveting head 15 connected in sequence. Preferably, the driving component 13 is a servo motor, which has high precision and stable torque, and can provide better riveting effect. The top of the driving block is connected to the driving component 13 and the bottom is connected to the riveting head 15. The driving component 13 provides driving force so that the riveting driving block 14 can move up and down, and drive the riveting head 15 at the bottom to complete the lifting and pressing actions.The riveting fixture 20 is located at the bottom of the riveting head 15 and includes a positioning post 21, a fixing seat 22, and a base 23. The positioning post 21 is fixed perpendicularly to the fixing seat 22, and the base 23 is located below the fixing seat 22. Furthermore, an elastic structure is provided between the fixing seat 22 and the base 23. This elastic structure provides a certain elastic force when the fixing seat 22 moves up and down. Currently, during the riveting process, the product to be riveted needs to be fixed on the fixture, and then pressure is applied to the product by the pressure head to complete the riveting. At this time, the fixture is often subjected to great pressure, which can easily cause damage. Therefore, in the prior art, the service life of the fixture is often short, requiring frequent replacement, which greatly increases the processing cost. This invention addresses this issue in riveting... In addition to the fixed seat 22, the bottom of the fixture 20 is equipped with a base 23 structure, and an elastic structure is set between the fixed seat 22 and the base 23. When the riveting head 15 presses down on the riveting fixture 20 during the riveting process, the positioning post 21 and the fixed seat 22 can be subjected to the elastic force provided by the elastic structure on the fixed seat 22 when they move down. This provides a certain buffer for the positioning post 21 and the connected fixed seat 22. When the riveting is fully pressed down, the positioning post 21 and the fixed seat 22 will not directly contact other parts below, avoiding direct contact between the fixed seat 22 and the rigid plane. This prevents the riveting fixture 20 from directly bearing the pressure brought by the riveting head 15, effectively protecting the overall structure of the riveting fixture 20, greatly extending the service life of the riveting fixture 20, effectively reducing fixture wear, and reducing processing costs.The positioning post 21 also contains an electrode post 25. The positioning post 21 has a hollow section through which the electrode post 25 passes. The electrode post 25 extends from the top of the positioning post 21 through the hollow section to the bottom of the base 23. The circumferential surface of the electrode post 25 has a ring of outwardly protruding annular protrusions 253. The circumferential surface of the electrode post 25 has stepped holes on the upper and lower sides of the protrusions 253, which mate with the protrusions 253, thus creating a gap between the electrode post 25 and the positioning post 21 around the electrode post 25 on the upper and lower sides of the protrusions 253. A spring 254 is fitted onto the electrode post 25 at the gap, and the spring 254 abuts against the protrusions 253 and the positioning post 21 within the gap, forming an elastic connection between the electrode post 25 and the positioning post 21. During the riveting process, the battery steel shell product is fitted onto the positioning post 20. When the riveting head 15 presses down on the positioning post 21, it first contacts the upper surface of the battery steel shell that is sleeved on the riveting fixture 20. Then, during the pressing process, the pole post 25 abuts against the positioning post 21 and moves downwards together. During the riveting process, the pole post 25 and the annular part at the top of the battery steel shell receive direct pressure from the riveting head 15, while the remaining parts only indirectly receive a portion of the thrust from the riveting head 15. Furthermore, the positioning post 21 and the pole post 25, through the elastic force provided by the internal spring 254, can provide a certain buffering effect, further reducing the instantaneous pressure received by the battery steel shell fixed on the positioning post 21. This structural design can reduce the pressure received by the battery steel shell product during processing, prevent deformation or damage during processing, and effectively protect the overall shape and structure of the battery steel shell.

[0041] Reference Figures 2 to 5In a non-limiting embodiment of the present invention, the elastic structure includes a guide post 222 and an elastic element 223. The edge of the fixing seat 22 is provided with a plurality of fixing holes 221, and the guide post 222 is provided in each of the plurality of fixing holes 221. The fixing seat 22 and the guide post 222 are slidably connected through the fixing holes 221. The elastic element 223 is sleeved on each of the guide posts 222. The elastic element 223 abuts against the top fixing seat 22 and provides elastic force. The bottom of the guide post 222 is fixedly connected to the base 23. In this embodiment, the elastic structure includes guide posts 222 and elastic elements 223. Preferably, the elastic element 223 is a compression spring, which has a better buffering effect on axial pressure. In addition to compression springs, other elastic elements 223 that meet the requirements can also be used. Multiple corresponding fixing holes 221 are provided at the edges of the base 23 and the fixed seat 22. Guide posts 222 are installed in each fixing hole 221. The fixed seat 22 and the guide posts 222 form a sliding connection, allowing the fixed seat 222 to slide up and down. The base 23 is fixed to the bottom of the guide posts 222. Furthermore, an elastic element 223 is sleeved on the guide post 222. The elastic element 223 forms an elastic abutment with the top fixed seat 22, providing a certain elastic force when the top fixed seat 22 slides up and down. The connection is made through the guide posts 222, and the elastic element 223 is used to elastically abut against the top fixed seat 22, providing a certain elastic force when the top fixed seat 22 slides up and down. An elastic element 223 is sleeved on the post 222. During the riveting process, when the riveting head 15 presses down on the riveting fixture 20, the positioning post 21 and the fixed seat 22 move down along the guide post 222 and are subjected to the elastic force provided by the elastic element 223 on the fixed seat 22. This provides a certain buffer to the positioning post 21 and the connected fixed seat 22. When the riveting is fully pressed down, the positioning post 21 and the fixed seat 22 will not directly contact other parts below, avoiding direct contact between the fixed seat 22 and the rigid plane. This prevents the riveting fixture 20 from directly bearing the pressure brought by the riveting head 15, effectively protecting the overall structure of the riveting fixture 20, greatly extending the service life of the riveting fixture 20, effectively reducing fixture wear, and reducing processing costs. In this embodiment, specifically, four fixing holes 221 and four guide posts 222 are provided and located at the four corners of the fixed seat 22.

[0042] Reference Figures 2 to 5In a non-limiting embodiment of the present invention, a buffer structure 24 is further provided between the fixed base 22 and the base 23. The buffer structure includes a positioning plate 241 and a buffer plate 242 arranged sequentially from top to bottom. A protruding positioning block 243 is provided on one side of the positioning plate 241. The positioning plate 241 and the buffer plate 242 have through holes at positions relative to the pole post 25 for the pole post 25 to pass through. The edges of the positioning plate 241 and the buffer plate 242 are provided with through holes at positions relative to the guide post 222 for the guide post 222 to pass through. The positioning plate 241 and the buffer plate 242 are sleeved on the pole post 25 and the guide post 222 through the provided through holes. The bottom of the spring 254 on the side below the protrusion 253 on the pole post 25 elastically abuts against the positioning plate 241. The elastic element 223 sleeved on the guide post 222 is located between the fixed base 22 and the positioning plate 241 and elastically abuts against the fixed base 22 and the positioning plate 241 respectively. In this embodiment, a buffer structure 24 is also provided between the fixed base 22 and the base 23. The buffer structure 24 includes a positioning plate 241 and a buffer plate 242. The positioning plate 241 is located above the buffer plate 242. A protruding positioning block 243 is provided on one side of the positioning plate 241. The positioning block has a hole for positioning, which is used for positioning and limiting during riveting. The length of the buffer plate 242 is greater than that of the positioning plate 241 to reserve some floating space to prevent collisions and other problems due to the accuracy error of the turntable when transporting the battery steel shell to the fixture. The edges of the positioning plate 241 and the buffer plate 242 are provided with through holes that cooperate with the guide post 222. A through hole for the electrode post 25 to pass through is provided at the center. The positioning plate 241 and the buffer plate 242 are fixed by the guide post 222 and the electrode post 25. A groove is provided inside the through hole that fixes the positioning plate 241 to the pole post 25. This groove allows the positioning plate 241 to abut against the spring 254 on one side below the protrusion 253 inside the pole post 25. During the riveting process, this provides a certain upward buffering force to the pole post 25, reducing the instantaneous pressure on the battery steel shell on the positioning post 21 and preventing excessive force from causing deformation or damage to the battery steel shell. In addition, the elastic element 223 sleeved on the guide post 222 abuts against the bottom of the fixing seat 22 and the top of the positioning plate 241, respectively, so that the two can form an elastic connection through the elastic element 223. During the riveting process, when the fixing seat 22 and the pole post 25 move downward under the pressure of the riveting head 15, this provides a certain buffering effect and avoids the bottom of the fixing seat 22 from directly contacting the rigid plane, preventing damage to the fixture and effectively protecting the fixture.

[0043] Reference Figures 2 to 5In a non-limiting embodiment of the present invention, the top of the positioning post 21 has rivet holes 213 distributed in a stepped manner, and a guide hole 252 is provided at the center of the rivet holes 213. The top of the pole post 25 is provided with a protruding guide post 251 that cooperates with the guide hole 252, and the guide post 251 is installed inside the guide hole 252. In this embodiment, the top of the positioning post 21 has a stepped riveting hole 213, which mates with the inner annular part of the battery steel shell that needs to be riveted. A guide hole 252 is provided at the center of the riveting hole 213. The top of the pole post 25 inside the positioning post 21 is provided with a guide post 251 that mates with the guide hole 252. The guide post 251 is inserted into the guide hole 252, and in the initial state, the bottom plane of the guide post 251 is lower than the bottom plane of the guide hole 252. This ensures that during the riveting process, after the riveting head 15 compacts and tightens the annular part, the pole post 25 contacts the positioning post 21 and moves downward together, leaving a distance for the riveting head 15 to compact and tighten the annular part, ensuring that there are no gaps between the annular parts at the top, thus guaranteeing the riveting effect.

[0044] Reference Figures 2 to 5 In a non-limiting embodiment of the present invention, a plurality of vent holes 211 are provided at the top edge of the side of the positioning post 21, and a plurality of parallel weight-reducing grooves 212 are provided on the side of the positioning post 21. In this embodiment, the plurality of vent holes 211 at the top edge of the side of the positioning post 21 facilitates ventilation, preventing the battery steel shell from being difficult to remove after being fitted onto the positioning post 21. The plurality of parallel weight-reducing grooves 212 on the side of the positioning post 21, specifically, in this embodiment, are arranged in two rows, and the weight-reducing grooves 212 can reduce the weight of the fixture and reduce a certain load.

[0045] Reference Figures 1 to 2 In a non-limiting embodiment of the present invention, the pressure mechanism 10 further includes a first base 11 and a second base 12 distributed in parallel. The first base 11 is located above the second base 12, and a plurality of fixing posts 16 are provided between the first base 11 and the second base 12, and are connected and fixed by the plurality of fixing posts 16. In this embodiment, the pressure mechanism 10 includes a first base 11 and a second base 12 distributed vertically in parallel, with a certain distance between the first base 11 and the second base 12 to provide space for the installation of other structures. A plurality of through holes are provided at the edges of the first base 11 and the second base 12 for the fixing posts 16 to pass through, and the fixing posts 16 connect and fix the first base 11 and the second base 12 through the provided through holes. Specifically, in this embodiment, four fixing posts 16 are provided, distributed at the four corners of the first base 11 and the second base 12.

[0046] Reference Figures 1 to 2 In a non-limiting embodiment of the present invention, the driving member 13 is located on the first base 11, the bottom of the riveting driving block 14 passes through the first base 11, and the riveting fixture 20 is located between the first base 11 and the second base 12. In this embodiment, the driving member 13 is fixed on the first base 11, the bottom of the riveting driving block 14 passes through the first base 11, and the riveting driving block 14 can move up and down through the driving member 13, thereby driving the riveting head 15 fixed at the bottom to perform lifting and pressing actions. The riveting fixture 20 is located between the first base 11 and the second base 12 and is fixed directly below the riveting head 15.

[0047] Reference Figures 1 to 2 In a non-limiting embodiment of the present invention, a lower rigid limiting structure 50 is further provided below the riveting fixture 20. The lower rigid limiting structure 50 is fixed on the second base 12. The lower rigid limiting structure 50 includes a top limiting block 51, which is located below the base 23 at the bottom of the riveting fixture 20. In this embodiment, the lower rigid limiting structure 50 is provided on the second base 12 at the bottom of the riveting fixture 20. The lower rigid limiting structure 50 includes a top limiting block 51. The base 23 of the riveting fixture 20 is located directly above the limiting block 51. During the riveting process, the limiting block 51 provides a rigid plane to limit the downward moving electrode post 25 and the base 23. After both the electrode post 25 and the base 23 contact the limiting block 51, the annular part at the top of the battery steel shell is riveted, completing the riveting process of the battery steel shell.

[0048] Reference Figures 1 to 2In a non-limiting embodiment of the present invention, the riveting fixture 20 is further provided with a clamping device and a detection device 40 on its side. The clamping device 30 is fixed on the second base 12. The clamping device 30 is provided with a clamping structure 31 on the side of the riveting fixture 20. The clamping structure 31 extends out and is located on both sides of the riveting fixture 20. The detection device 40 is fixed on the second base 12. The top of the detection device 40 is provided with a protruding probe 41 in the direction close to the positioning post 21 of the riveting fixture 20. In this embodiment, the second base 12 is also provided with a clamping device 30. The clamping device 30 is located on the side of the riveting fixture 20, and a protruding clamping structure 31 is provided on the side near the riveting fixture 20. The clamping structure 31 is located on both sides of the riveting fixture 20 and can clamp the battery steel shell fixed on the riveting fixture 20. After riveting is completed, it prevents the riveting head 15 from moving upward and taking the battery steel shell with it. The second base 12 is also provided with a detection device 40. The top of the detection device 40 is provided with a protruding probe 41 near the positioning post 21 of the riveting fixture 20. The detection device 40 can detect whether the riveted battery steel shell is still on the fixture, so as to determine whether the next riveting can be started, which greatly improves the processing efficiency. In this embodiment, preferably, there are two detection devices 40, which are located on both sides of the positioning post 21 of the riveting fixture 20, respectively, and perform detection from two opposite directions to ensure that the detection results are accurate.

[0049] Reference Figures 1 to 5 In a non-limiting embodiment of the present invention, a riveting method for a battery steel casing includes the following steps: S1: First, the inner annular part that needs to be riveted inside the battery steel shell is installed in the riveting hole 213 at the top of the positioning post 21 of the riveting fixture 20. Then, the battery steel shell that has been preliminarily assembled in the previous station and the outer annular part that needs to be riveted are installed on the positioning post 21 of the riveting fixture 20 by a robot, and then transported to the area below the riveting head 15. In this invention, the annular part that needs to be riveted on the battery steel shell includes an outer annular part and an inner annular part. The inner annular part is first installed in the riveting hole 213 at the top of the positioning post 21. After the outer annular part and the battery steel shell are basically assembled, they are installed on the positioning post 21 by a robot. Then, the riveting fixture 20 is transported to the area below the riveting head 15 of the pressure device by a turntable or other mechanism, ready for riveting work.

[0050] S2: Start the driving component 13. The driving component 13 drives the riveting driving block 14 to move downward, which in turn drives the riveting head 15 fixed at the bottom of the riveting driving block 14 to press down. In the above steps, the driving component 13 drives the riveting driving block 14 to move downward and drives the riveting head 15 at the bottom to press down.

[0051] S3: The riveting head 15 contacts the top surface of the battery steel shell and presses down. The positioning post 21 and the fixing seat 22 retract downward together. At this time, the elastic element 223 sleeved on the guide post 222 provides elastic force and provides a certain buffering effect on the fixing seat 22. At the same time, the spring 254 sleeved on the pole post 25 at the gap begins to compress under the influence of the downward movement of the positioning post 21. In the above steps, after the riveting head 15 contacts the top of the battery steel shell product, the positioning post 21 receives pressure and begins to move downward, driving the fixing seat 22 to move downward together. At this time, the elastic element 223 on the guide post 222 begins to contract and can provide a certain buffering effect on the fixing seat 22 to prevent excessive instantaneous pressure. At the same time, the spring 254 sleeved on the pole post 25 inside the positioning post 21 also begins to contract, and the pole post 25 begins to move upward relative to the externally wrapped positioning post 21.

[0052] S4: When the riveting head 15 continues to press down until the shoulder of the guide post 251 contacts the positioning post 21, the positioning post 21 and the pole post 25 retract downward together under the drive of the positioning post 21. At this time, the riveting fixture 20 moves downward as a whole under the pressure of the riveting head 15. In the above steps, the pole post 25 inside the positioning post 21 moves upward relative to the positioning post 21 until the shoulder of the guide post 251 at the top of the pole post 25 contacts and abuts the bottom plane of the guide hole 252 of the positioning post 21. Then, the pole post 25 begins to retract downward together with the positioning post 21 under the drive of the positioning post 21. At this time, the riveting fixture 20 moves downward as a whole under the pressure of the riveting head 15. The spring 254 fixed on the pole post 25 can provide a certain buffering effect when the shoulder of the guide post 251 contacts the bottom plane of the guide hole 252, reducing the instantaneous pressure and effectively protecting the structure of the riveting fixture 20 and the battery steel shell product.

[0053] S5: After the bottom surfaces of the pole post 25 and the base 23 both contact the limiting block 51 at the top of the lower hard limiting structure 50, the annular part at the top of the battery steel shell is riveted, and the riveting of the battery steel shell product is completed; in the above steps, after the bottom surfaces of the pole post 25 and the base 23 both contact the limiting block 51 at the top of the lower hard limiting structure, the annular part at the top of the battery steel shell is riveted, and the riveting of the battery steel shell product is completed.

[0054] S6: Activate the clamping device 30 to clamp the riveted product, and then drive the riveting drive block 14 to move upward through the drive component 13. After the riveting drive block 14 resets, release the clamping structure 31 of the clamping device 30. In the above steps, after the riveting is completed, the clamping structure 31 on the clamping device 30 clamps the riveted battery steel shell product to prevent the product from being pulled out when the upper pressure head resets upward.

[0055] S7: Start the detection device 40. Through the sensing function of the detection device 40, detect whether the battery steel shell product is still on the riveting fixture 20. After the detection is completed, the next riveting operation is carried out in a cycle. In the above steps, the detection device 40 can detect whether the product is still on the riveting fixture 20. After confirmation, it is transported to the next station by the turntable mechanism and the next riveting operation begins, ensuring the normal operation of the riveting process automation and improving processing efficiency.

[0056] In the description of this invention, it should be understood that terms such as "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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. Therefore, they should not be construed as limiting this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0059] Although the description of the invention has been given in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the foregoing. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A battery steel shell riveting device, comprising a pressure mechanism and a riveting fixture, wherein the pressure mechanism includes a driving member, a riveting driving block, and a riveting head, the top of the riveting driving block is connected to the driving member, the riveting head is fixed to the bottom of the riveting driving block, and the riveting fixture is located below the riveting head, characterized in that, The riveting fixture includes a positioning post, a fixing seat, and a base. The positioning post is vertically fixed on the fixing seat, and the base is located below the fixing seat. An elastic structure is provided between the fixing seat and the base. The positioning post has a hollow part, and an electrode post is provided in the hollow part. The electrode post extends from the top of the positioning post through the positioning post and into the base. The circumferential surface of the electrode post has an outwardly protruding annular protrusion. The inner circumferential surface of the positioning post has a stepped structure that cooperates with the protrusion at the positions above and below the protrusion, so that a gap is formed between the circumferential surface of the electrode post at the positions above and below the protrusion and the inner circumferential surface of the positioning post. A spring is sleeved on the electrode post at the position of the gap. The spring abuts against the protrusion and the positioning post respectively, and the electrode post and the positioning post are elastically connected through the protrusion and the spring.

2. The battery steel shell riveting device according to claim 1, characterized in that, The elastic structure includes guide posts and elastic elements. The edge of the fixing seat is provided with multiple fixing holes, and each of the multiple fixing holes is provided with a guide post. The fixing seat is slidably connected to the guide posts through the fixing holes. Each guide post is fitted with an elastic element, which abuts against the top fixing seat and provides elastic force. The bottom of the guide post is fixedly connected to the base.

3. The battery steel shell riveting device according to claim 2, characterized in that, A buffer structure is also provided between the fixed seat and the base. The buffer structure includes a positioning plate and a buffer plate arranged vertically. A protruding positioning block is provided on one side of the positioning plate. The positioning plate and the buffer plate have through holes for the pole post to pass through at their respective positions relative to the pole post. The edges of the positioning plate and the buffer plate also have through holes for the guide post to pass through at their respective positions relative to the guide post. The positioning plate and the buffer plate are sleeved on the pole post and the guide post through the provided through holes. The bottom of the spring on the side below the protrusion on the pole post elastically abuts against the positioning plate. The elastic element sleeved on the guide post is located between the fixed seat and the positioning plate and elastically abuts against the fixed seat and the positioning plate respectively.

4. The battery steel shell riveting device according to claim 3, characterized in that, The top of the positioning post has rivet holes distributed in a stepped manner, and a guide hole is opened at the center of the rivet holes. The top of the pole post is provided with a protruding guide post that cooperates with the guide hole, and the guide post is installed inside the guide hole.

5. The battery steel shell riveting device according to claim 4, characterized in that, Multiple vent holes are provided at the top edge of the side of the positioning post, and multiple parallel weight-reducing grooves are provided on the side of the positioning post.

6. The battery steel shell riveting device according to claim 1, characterized in that, The pressure mechanism also includes a first base and a second base distributed in parallel. The first base is located above the second base, and a plurality of fixing columns are provided between the first base and the second base, and are connected and fixed by the plurality of fixing columns.

7. The battery steel shell riveting device according to claim 6, characterized in that, The driving component is located on the first base, the bottom of the riveting driving block passes through the first base, and the riveting fixture is located between the first base and the second base.

8. The battery steel shell riveting device according to claim 7, characterized in that, The riveting fixture is further provided with a lower hard limiting structure below it. The lower hard limiting structure is fixed on the second base. The lower hard limiting structure includes a top limiting block, which is located below the base at the bottom of the riveting fixture.

9. The battery steel shell riveting device according to claim 7, characterized in that, The riveting fixture is also provided with a clamping device and a detection device on its side. The clamping device is fixed on the second base. The clamping device has a clamping structure on the side near the riveting fixture. The clamping structure extends out and is located on both sides of the riveting fixture. The detection device is fixed on the second base. The top of the detection device has a protruding probe in the direction near the positioning post of the riveting fixture.

10. A riveting method for a battery steel casing, characterized in that, The battery steel casing riveting method according to any one of claims 1 to 9, wherein the battery steel casing riveting method comprises the following steps: S1: First, the inner annular part that needs to be riveted inside the battery steel shell is installed in the riveting hole at the top of the positioning post of the riveting fixture. Then, the battery steel shell that has been preliminarily assembled in the previous station and the outer annular part that needs to be riveted are installed on the positioning post of the riveting fixture by the robot arm and then transported to the bottom of the riveting head. S2: Start the driving unit, which drives the riveting driving block to move downward, thereby causing the riveting head fixed at the bottom of the riveting driving block to press down. S3: The riveting head contacts the top surface of the battery steel shell and presses down. The positioning post and the fixing seat retract downward together. At this time, the elastic element sleeved on the guide post provides elastic force and provides a certain buffering effect on the fixing seat. At the same time, the spring sleeved on the pole at the gap begins to compress under the influence of the positioning post. S4: When the riveting head continues to press down until the shoulder of the guide post at the bottom contacts the positioning post, the positioning post and the pole post retract downward together under the drive of the positioning post. At this time, the riveting fixture moves downward as a whole under the pressure of the riveting head. S5: After the bottom surfaces of the pole post and the base have both contacted the limiting block at the top of the lower hard limiting structure, the annular part at the top of the battery steel shell is riveted, and the riveting of the battery steel shell product is completed. S6: Start the clamping device to clamp the riveted product, and then drive the riveting drive block to move upward through the drive component. After waiting for the riveting drive block to reset, release the clamping structure of the clamping device. S7: Start the detection device and use its sensing function to detect whether the battery steel shell product is still on the riveting fixture. After the detection is completed, repeat the riveting operation.

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