Battery pack shell riveting device based on hole site self-calibration positioning

Abstract

The present application relates to the technical field of battery pack shell riveting, in particular to a battery pack shell riveting device based on hole position self-calibration positioning, which comprises a material supporting plate for supporting the battery pack shell, the battery pack shell is formed by the butt joint of an upper shell and a lower shell, the upper shell and the lower shell are provided with riveting holes correspondingly, the four edges of the material supporting plate are fixed with linear guides, the top of the linear guides is provided with a moving plate through an electric moving base, the top of the moving plate is fixedly installed with an upper guide frame and a lower guide frame from top to bottom, the device sets a complete riveting mechanism at each of the four corner points of the battery pack shell and realizes synchronous operation, solves the problems of shell deflection deformation and hole position misplacement caused by traditional single-hole sequential riveting, realizes high-precision riveting of the battery pack shell, improves the consistency of multi-hole riveting, and greatly improves the riveting efficiency, which is suitable for large-scale production requirements.

Description

Technical Field

[0001] This invention relates to the field of battery pack housing riveting technology, specifically a battery pack housing riveting device based on hole position self-calibration positioning. Background Technology

[0002] In the manufacturing of new energy vehicles, the battery pack is the power heart of the vehicle. Its manufacturing precision and assembly reliability directly determine the vehicle's range, safety performance and service life. Riveting technology, as the core technology for lightweight connection of battery pack shells, has gradually replaced traditional welding technology. Currently, the battery pack shells of new energy vehicles are mostly made of lightweight materials such as aluminum alloy and high-strength steel.

[0003] Traditional battery pack housing riveting devices lack a multi-inflection point synchronous riveting mechanism, which fails to achieve symmetrical force distribution and precise synchronous positioning. This presents several critical technical challenges in the riveting process due to the large size of the battery pack housing, insufficient rigidity after the upper and lower housings are joined, and low joint strength. These challenges are compounded by the unilateral force and misalignment issues inherent in traditional single-hole sequential riveting. Firstly, there are significant structural assembly defects. Single-hole sequential riveting easily leads to housing deflection and deformation, hole misalignment, loosening at the riveting joint, and poor fit. The root cause lies in the lack of a multi-inflection point synchronous riveting mechanism, which prevents symmetrical force distribution and precise synchronous positioning. Secondly, there are potential production efficiency and quality risks. Single-hole sequential operation results in low riveting efficiency, and unilateral force easily causes microscopic deformation of the housing, affecting subsequent battery pack assembly accuracy and product reliability.

[0004] Therefore, it is necessary to design a hole self-calibration riveting technology that can achieve simultaneous riveting at four inflection points, avoid shell deflection deformation, and at the same time achieve symmetrical force and precise alignment, improve riveting efficiency and quality, so as to solve the above-mentioned process pain points and ensure the assembly accuracy and production reliability of the battery pack shell. Summary of the Invention

[0005] The purpose of this invention is to provide a battery pack housing riveting device based on hole position self-calibration positioning, which solves the problems mentioned in the background art above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A battery pack housing riveting device based on hole self-calibration positioning includes a material support plate for supporting the battery pack housing. The battery pack housing is formed by the mating of an upper housing and a lower housing, and the upper housing and the lower housing are respectively provided with riveting holes. The material support tray is fixed with linear guide rails on all four edges. A moving plate is mounted on the top of the linear guide rails via an electric moving base. An upper guide frame and a lower guide frame are fixedly installed on the top of the moving plate from top to bottom. A straightening component for adjusting the position of the riveted parts is provided on one side of the upper guide frame, and a feeding component for vertically pushing the riveted parts is provided on one side of the lower guide frame.

[0007] Furthermore, the upper guide frame and the lower guide frame are respectively slidably connected to an upper slider and a lower slider inside; The straightening assembly includes a horizontal frame, a horizontal bidirectional screw, and a straightening clamp. Both ends of the horizontal bidirectional screw are rotatably connected to the inner wall of the horizontal frame.

[0008] Furthermore, two guide blocks that cooperate with the horizontal bidirectional screw are slidably connected inside the horizontal frame, the horizontal frame is fixedly connected to the end of the upper slider, and the straightening clamp is fixedly connected to the guide blocks.

[0009] Furthermore, a support plate is fixedly connected to the end of the lower slider, and a support frame is fixedly connected to the end of the support plate away from the lower guide frame. An embedding groove is provided at one end of the support plate and directly below the support frame.

[0010] Furthermore, the feeding assembly includes a material cylinder and a miniature electric lifting push rod. The material cylinder is fixedly connected to the top of the support frame, and the miniature electric lifting push rod is fixedly installed in the embedding groove of the support plate.

[0011] Furthermore, a lower upsetting die is fixedly connected to the top of the material cylinder, and the lower upsetting die is connected to the material cylinder.

[0012] Furthermore, a chassis that matches the shape of the upsetting head die is slidably connected inside the barrel, and the top output end of the micro electric lifting push rod is fixedly connected to the chassis.

[0013] Furthermore, the bottom end of the upper guide frame is fixedly connected to the top end of the lower guide frame, and multiple sets of horizontal electric push rods are fixedly installed at both ends of the top of the material support plate, with a stop plate fixedly connected to the output end of the horizontal electric push rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In use, this invention synchronously rivets the battery pack housing through the four corner holes, fundamentally solving the core defect of traditional single-hole sequential riveting and significantly improving the riveting accuracy and structural stability of the housing. Traditional devices can only rivet one hole at a time, and unilateral force can easily cause relative deflection and hole misalignment of the upper and lower housings, thus affecting the overall assembly accuracy of the housing. This device is equipped with a complete riveting mechanism at each of the four corner points, and the riveting operation is carried out synchronously. It applies uniform and symmetrical riveting force to the four corner points of the housing, effectively balancing the local stress generated during the riveting process, avoiding deformation and misalignment of the housing due to unilateral force, ensuring that the upper and lower housings fit tightly and the holes are accurately aligned after riveting, and the overall structure of the housing is neat, fully meeting the stringent assembly accuracy requirements of the battery pack housing, and laying a reliable foundation for the subsequent overall assembly of the battery pack.

[0015] 2. The four-inflection-point synchronous operation significantly improves riveting efficiency, ensures consistency in multi-hole riveting, and adapts to the needs of large-scale production. Compared with the traditional single-hole sequential riveting mode, this device's four riveting mechanisms simultaneously complete the entire process of positioning, straightening, feeding, pre-upsetting, and riveting, eliminating the need to wait for each hole. This reduces the overall riveting time to about one-quarter of the traditional mode, significantly improving production efficiency. It also effectively avoids quality problems such as hole position deviation and uneven riveting tightness that are prone to occur in traditional sequential riveting. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings; Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the linear guide structure in this invention; Figure 3 This is a schematic diagram of the straightening clip structure in this invention; Figure 4 This is a schematic diagram of the horizontal frame structure in this invention; Figure 5 This is a schematic diagram of the upsetting head lower die structure in this invention; Figure 6 This is a schematic diagram of the mobile flat panel structure in this invention; Figure 7 This is a schematic diagram of the chassis structure in this invention; Figure 8 This is a diagram showing the initial placement of the straightening component and the feeding component in this invention.

[0017] Reference numerals: 1. Material support tray; 2. Linear guide rail; 3. Electric moving base; 4. Moving plate; 501. Upper guide frame; 502. Lower guide frame; 601. Horizontal frame; 602. Horizontal bidirectional screw; 603. Straightening clamp; 7. Support plate; 8. Support frame; 901. Material cylinder; 902. Miniature electric lifting push rod; 903. Upsetting head lower die; 904. Chassis; 10. Horizontal electric push rod; 11. Support plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: As Figures 1-8 As shown, this device takes hole self-calibration positioning as its core, and combines multi-directional synchronous positioning, precise feeding, automatic straightening and step-by-step riveting to achieve high-precision, non-deflection deformation riveting assembly of the upper and lower shells of the battery pack. The entire process from positioning, feeding, straightening to riveting forms a closed-loop precise cooperation. Specifically, the battery pack shell riveting device based on hole self-calibration positioning includes a material support plate 1 for supporting the battery pack shell. The battery pack shell is formed by the mating of the upper shell and the lower shell, and the upper shell and the lower shell are respectively provided with riveting holes. Linear guide rails 2 are fixed to the four edges of the material support tray 1. A movable plate 4 is set on the top of the linear guide rails 2 via an electric movable base 3. An upper guide frame 501 and a lower guide frame 502 are fixedly installed on the top of the movable plate 4 from top to bottom. A straightening component for adjusting the position of the riveted parts is set on one side of the upper guide frame 501, and a feeding component for vertically pushing the riveted parts is set on one side of the lower guide frame 502.

[0020] The upper guide frame 501 and the lower guide frame 502 are respectively slidably connected to the upper slider and the lower slider. The straightening assembly includes a horizontal frame 601, a horizontal bidirectional screw 602 and a straightening clamp 603. Both ends of the horizontal bidirectional screw 602 are rotatably connected to the inner wall of the horizontal frame 601.

[0021] Two guide blocks that cooperate with the horizontal bidirectional screw 602 are slidably connected inside the horizontal frame 601. The horizontal frame 601 is fixedly connected to the end of the upper slider. The straightening clamp 603 is fixedly connected to the guide block. The end of the lower slider is fixedly connected to the support plate 7. The end of the support plate 7 away from the lower guide frame 502 is fixedly connected to the support frame 8. An embedding groove is opened at one end of the support plate 7 and directly below the support frame 8.

[0022] Example 2: The feeding assembly includes a material cylinder 901 and a miniature electric lifting push rod 902. The material cylinder 901 is fixedly connected to the top of the support frame 8, and the miniature electric lifting push rod 902 is fixedly installed in the embedding groove of the support plate 7.

[0023] The top of the material cylinder 901 is fixedly connected to the upsetting head lower die 903, and the upsetting head lower die 903 is connected to the material cylinder 901. The material cylinder 901 is slidably connected to the chassis 904 that matches the shape of the upsetting head lower die 903. The top output end of the micro electric lifting push rod 902 is fixedly connected to the chassis 904.

[0024] The bottom of the upper guide frame 501 is fixedly connected to the top of the lower guide frame 502. Multiple sets of horizontal electric push rods 10 are fixedly installed at both ends of the top of the material support plate 1. The output end of the horizontal electric push rod 10 is fixedly connected to the abutment plate 11.

[0025] Based on Embodiment 1 and Embodiment 2, the working principle of the battery pack housing riveting device based on hole position self-calibration positioning is as follows: The battery pack housing is precisely assembled from an upper housing and a lower housing, with pre-set matching riveting holes at corresponding positions for the insertion and fixing of riveting components. Initially, the assembled housing is placed stably on the material support plate 1, which provides stable horizontal support. Subsequently, multiple sets of horizontally positioned electric push rods 10 at both ends of the top of the material support plate 1 are simultaneously activated, their output ends pushing the abutment plate 11 towards the lower housing until the abutment plate 11 is tightly fitted against the outer wall of the lower housing. This lateral clamping force secures the lower housing while ensuring that the upper and lower housings remain aligned and tightly fitted, eliminating any gaps and providing a reliable reference for subsequent riveting alignment.

[0026] The precise horizontal adjustment of the riveting station consists of a linear guide rail 2, an electric moving base 3, a moving plate 4, and two sets of matching horizontal threaded rods and independent drive motors. The linear guide rail 2 is fixed to the four edges of the material support plate 1, and a horizontally placed first threaded rod is rotatably connected inside it. This threaded rod precisely matches the threaded groove at the bottom of the electric moving base 3 and is independently driven by a corresponding external motor. After starting, it can drive the electric moving base 3 to perform a long-stroke horizontal positioning along the linear guide rail 2. A similarly horizontally placed second threaded rod is rotatably connected inside the electric moving base 3, which matches the threaded groove at the bottom of the moving plate 4. Driven by another set of external motors, it can drive the moving plate 4 to perform a short-stroke horizontal fine adjustment on the electric moving base 3, ensuring that the straightening components and feeding components on the moving plate 4 are precisely aligned with the target riveting holes on the housing.

[0027] The top of the mobile flat panel 4 is fixedly equipped with an upper guide frame 501 and a lower guide frame 502 from top to bottom. Both are mutually fixed and each contains a vertically placed threaded rod and a matching drive motor: the upper guide frame 501 contains a third threaded rod, and the lower guide frame 502 contains a fourth threaded rod. Both sets of threaded rods are driven by independent external motors, and the motor that mates with the fourth threaded rod is embedded in the bottom of the lower guide frame 502. The third and fourth threaded rods are threadedly engaged with the upper and lower sliders, respectively. Activating the corresponding motor causes the third threaded rod to rotate, controlling the vertical movement of the upper slider along the upper guide frame 501, thereby synchronously displacing the straightening component. Rotating the fourth threaded rod controls the vertical movement of the lower slider along the lower guide frame 502, causing the feeding component to adjust its vertical position, thus meeting the requirements for straightening and feeding.

[0028] The straightening assembly consists of a horizontal frame 601, a horizontal bidirectional screw 602, and two straightening clamps 603. The horizontal frame 601 is fixedly connected to the end of the upper slider and rises and falls synchronously with the upper slider. The two ends of the horizontal bidirectional screw 602 are rotatably connected to the inner wall of the horizontal frame 601. The screw body has bidirectional threads and precisely engages with two guide blocks inside the horizontal frame 601. The straightening clamps 603 are fixedly corresponding to the guide blocks. When an external motor drives the horizontal bidirectional screw 602 to rotate, the two guide blocks drive the straightening clamps 603 to move synchronously in the opposite direction. By clamping and centering, the posture of the riveted parts is corrected, ensuring that the axis of the riveted parts is completely aligned with the axis of the riveting hole, achieving self-calibration of the hole position and avoiding riveting misalignment.

[0029] The material cylinder 901 is hollow inside and is used to pre-place the riveting parts. The inner wall matches the shape of the riveting parts to achieve circumferential constraint and prevent shaking during feeding. The top of the material cylinder 901 is fixed with the upsetting head lower die 903, and the two are internally connected. The upsetting head lower die 903 and the top surface of the base 904 are both provided with semi-circular grooves to cooperate in completing the pre-upsetting of the riveting parts.

[0030] After the riveting operation officially starts, the riveting parts are first placed into the material cylinder 901 one by one, and kept in a vertical position under the constraint of the inner wall of the material cylinder 901. Then, the motor driving the second threaded rod is started, which drives the moving plate 4 to move horizontally, so that the riveting parts in the material cylinder 901 are accurately aligned with the target riveting hole directly below. Immediately afterwards, the motor driving the fourth threaded rod is started, which drives the lower slide block to move upward, and simultaneously drives the support plate 7, the material cylinder 901 and the internal riveting parts to rise, until the upper end of the riveting part is smoothly inserted into the riveting hole of the upper and lower shells, completing the initial insertion.

[0031] While the riveting parts are being inserted, the motor driving the third threaded rod starts synchronously, causing the upper slider to move downwards, so that the straightening clamping plate 603 moves to both sides of the riveting parts extending from the top of the upper housing; then, the motor driving the transverse bidirectional screw 602 starts, causing the two straightening clamping plates 603 to close synchronously and fit tightly against the outer wall of the riveting parts. The symmetrical clamping force corrects the posture of the riveting parts, completes the self-calibration and positioning of the hole positions, and ensures the accuracy of riveting.

[0032] After the alignment and positioning are completed, the miniature electric lifting push rod 902 is activated, and its output end pushes the chassis 904 upward, causing the riveting part to move upward along the inner wall of the material cylinder 901 until the top surface of the chassis 904 is tightly fitted with the bottom surface of the upsetting head die 903. The semi-circular grooves of the two fit together to form a complete semi-circular forming cavity, pre-upsetting the upper end of the riveting part into a semi-circular head structure. At this time, the external riveting machine is activated to perform the final riveting on the pre-upsetting part of the riveting part. During the riveting process, the horizontal bidirectional screw 602 rotates in the opposite direction, causing the straightening clamp 603 to separate synchronously, releasing the clamping constraint, avoiding interference with the riveting action, and ensuring the quality of riveting formation.

[0033] After a single riveting hole is riveted, each component resets according to the procedure: the miniature electric lifting push rod 902 retracts, causing the chassis 904 to fall back to the bottom of the material cylinder 901; the straightening clamp 603 remains separated, and the upper slider causes the straightening component to rise and reset; the lower slider causes the feeding component to fall and reset; then, the motor driving the first threaded rod starts, causing the electric moving base 3 to move along the linear guide rail 2, switching to the next riveting hole station, and repeating the above complete process until all riveting holes are riveted.

[0034] This device is equipped with complete linear guide rails 2 and matching riveting mechanisms around the battery pack housing. It can simultaneously rivet the riveting holes at the four corner points of the housing, effectively balancing the forces generated during the riveting process and completely avoiding the problem of relative deflection of the housing caused by traditional single-hole sequential riveting. It balances riveting accuracy and work efficiency.

[0035] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A battery pack housing riveting device based on hole position self-calibration positioning, comprising a material support plate (1) for supporting the battery pack housing, characterized in that, The battery pack housing is formed by joining an upper housing and a lower housing together, and the upper housing and the lower housing are respectively provided with riveting holes; The material support tray (1) is fixed with linear guide rails (2) on all four edges. A moving plate (4) is provided on the top of the linear guide rail (2) via an electric moving base (3). An upper guide frame (501) and a lower guide frame (502) are fixedly installed on the top of the moving plate (4) from top to bottom. A straightening component for adjusting the position of the riveted parts is provided on one side of the upper guide frame (501), and a feeding component for vertically pushing the riveted parts is provided on one side of the lower guide frame (502).

2. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 1, characterized in that, The upper guide frame (501) and the lower guide frame (502) are respectively slidably connected to an upper slider and a lower slider inside; The straightening assembly includes a horizontal frame (601), a horizontal bidirectional screw (602), and a straightening clamp (603). Both ends of the horizontal bidirectional screw (602) are rotatably connected to the inner wall of the horizontal frame (601).

3. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 2, characterized in that, The horizontal frame (601) has two guide blocks that cooperate with the horizontal bidirectional screw (602) in a sliding connection. The horizontal frame (601) is fixedly connected to the end of the upper slider, and the straightening clamp (603) is fixedly connected to the guide blocks.

4. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 2, characterized in that, The end of the lower slider is fixedly connected to a support plate (7), and the end of the support plate (7) away from the lower guide frame (502) is fixedly connected to a support frame (8). An embedding groove is provided at one end of the support plate (7) and directly below the support frame (8).

5. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 1, characterized in that, The feeding assembly includes a material cylinder (901) and a miniature electric lifting push rod (902). The material cylinder (901) is fixedly connected to the top of the support frame (8), and the miniature electric lifting push rod (902) is fixedly installed in the embedding groove of the support plate (7).

6. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 5, characterized in that, The top of the material cylinder (901) is fixedly connected to the upsetting head lower die (903), and the upsetting head lower die (903) is connected to the material cylinder (901).

7. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 5, characterized in that, The material cylinder (901) is slidably connected to a chassis (904) that matches the shape of the upsetting head lower die (903), and the top output end of the micro electric lifting push rod (902) is fixedly connected to the chassis (904).

8. The battery pack housing riveting device based on hole position self-calibration positioning according to claim 1, characterized in that, The bottom end of the upper guide frame (501) is fixedly connected to the top of the lower guide frame (502). Multiple sets of horizontal electric push rods (10) are fixedly installed at both ends of the top of the material support plate (1). The output end of the horizontal electric push rod (10) is fixedly connected to a stop plate (11).

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