Square aluminum alloy lithium battery shell material header device

Abstract

This utility model discloses a head-cutting device for square aluminum alloy lithium battery shell materials, belonging to the field of battery shell processing technology. It includes: a mold core configured to fit into a square battery shell, with grooves along its length on both its upper and lower end faces; an upper pressure plate and a lower pressure plate, respectively positioned above and below the mold core, which press the upper and lower end faces of the square battery shell into contact with the grooves; and side clamping plates positioned on both sides of the mold core to press the left and right sides of the square battery shell. By using a mold core with grooves and matching upper and lower pressure plates, along with the side clamping plates to apply pressure to all four sides of the battery shell, it effectively adapts to the asymmetrical structure of square aluminum alloy lithium battery shells, ensuring uniform force and regular compression during the head-cutting process, thus solving the problem that traditional round tube head-cutting equipment cannot handle square materials.

Description

Technical Field

[0001] This utility model belongs to the field of battery casing processing technology, specifically relating to a head-cutting device for square aluminum alloy lithium battery casing material. Background Technology

[0002] With the rapid development of the new energy vehicle industry, square power lithium batteries have been widely used. Currently, the manufacturing of lithium battery casings mainly employs three processes: stamping, high-frequency welding, and cold drawing. However, each process has its limitations: stamping has limitations in processing depth, while high-frequency welding faces the potential risk of leakage. In contrast, cold-drawn aluminum alloy lithium battery casings not only overcome the shortcomings of the aforementioned two methods but also offer superior performance, thus gaining widespread promotion and development within the industry.

[0003] In the production process of square lithium battery casings, the lithium battery casing material first needs to be passed through the outer mold of the cold drawing die. However, since the size of the original material is usually larger than the opening size of the outer mold of the cold drawing die, the material must first be headed (shrunken) to reduce its size so that it can pass smoothly through the outer mold and be clamped by the traction equipment in preparation for the subsequent drawing operation.

[0004] Currently, the industry commonly uses heading equipment for cold drawing of round tubes. After heading, the round tube-shaped aluminum alloy cold-drawn material has evenly stacked wrinkles and a significantly reduced size, making it easier to insert into the outer mold of the cold drawing die. This heading method is suitable for cold-drawn materials with regular and symmetrical shapes such as circles. However, the square lithium battery casings currently being processed have uneven and symmetrical shapes, and the existing equipment cannot meet their requirements. Utility Model Content

[0005] This utility model addresses the aforementioned problems in the existing technology by proposing a head-cutting device for square aluminum alloy lithium battery casing materials.

[0006] This utility model can be achieved through the following technical solutions:

[0007] A head-cutting device for square aluminum alloy lithium battery casing material, comprising:

[0008] The mold core is configured to fit into a square battery casing, and the upper and lower end faces of the mold core are provided with grooves along the length direction;

[0009] An upper pressure plate and a lower pressure plate are respectively disposed above and below the mold core. The upper pressure plate and the lower pressure plate press the upper and lower end faces of the square battery casing to abut against the groove.

[0010] Side clamps are set on both sides of the mold core and are used to press the left and right sides of the square battery casing.

[0011] As a further improvement of this utility model, the groove is configured as a V-shaped structure or an arc surface structure, and the lower pressing surface of the upper pressing head and the lower pressing head matches the shape of the groove.

[0012] As a further improvement of this utility model, the upper pressure plate or the lower pressure plate is provided with a pin, which is used to pierce the top or bottom surface of the square battery casing to form an exhaust hole.

[0013] As a further improvement of this utility model, the length of the mold core is shorter than the length of the square battery shell. When the square battery shell is fitted onto the mold core, at least one end of the square battery shell extends beyond the mold core along the length direction and forms a suspended section of the shell.

[0014] As a further improvement of this utility model, the length of the mold core is shorter than the length of the upper pressure plate and the lower pressure plate. When the mold core is located between the upper pressure plate and the lower pressure plate, at least one end of the upper pressure plate and the lower pressure plate extends beyond the mold core along the length direction and forms a pressure plate suspension section.

[0015] As a further improvement of this utility model, the ejector pin is disposed in the suspended section of the pressure plate and is used to pierce the suspended section of the outer shell to form the exhaust hole.

[0016] As a further improvement of this utility model, the area of ​​the pressing surface of the side clamp is larger than the area of ​​the left and right sides of the square battery casing.

[0017] As a further improvement of this utility model, it also includes a driving mechanism, wherein the mold core, the upper pressure plate, the lower pressure plate, and the side clamping plate are driven by the independent driving mechanism to move linearly.

[0018] As a further improvement of this utility model, the driving mechanism is configured as a hydraulic press or a servo motor.

[0019] As a further improvement of this utility model, the drive mechanism is equipped with a limit alarm unit. When the drive mechanism exceeds the preset stroke, the limit alarm unit triggers an alarm and cuts off the power of the drive mechanism.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Adaptable to asymmetrical square structures, improving the uniformity and stability of heading: By setting a mold core with grooves and matching upper and lower pressure plates, and with the side clamps applying pressure to all four sides of the battery case, it can effectively adapt to the asymmetrical structure of square aluminum alloy lithium battery cases, ensuring uniform force and regular compression during the heading process, and solving the problem that traditional round tube heading equipment cannot handle square materials.

[0022] 2. Integrated vent hole processing function to improve production efficiency: Ejector pins are set on the upper or lower pressure plate to complete the vent hole piercing operation simultaneously during the heading process. No additional steps are required, which simplifies the process, improves the overall processing efficiency and automation level, and ensures that the vent hole position is accurate and the forming is consistent.

[0023] 3. Reasonable structural design avoids component interference and extends service life: The ejector pin safely drills holes in the unsupported area (suspended section of the square battery casing) to avoid the ejector pin touching the mold core and causing damage, thereby improving the safety and durability of the equipment operation;

[0024] 4. Independent drive + limit alarm for high precision and safety: Each component is driven independently by hydraulic or servo motor, ensuring controllable and coordinated movements; at the same time, a limit alarm unit is configured to immediately alarm and cut off the power in case of abnormal stroke, ensuring stable operation and safe operation of the equipment, suitable for automated production lines;

[0025] 5. Uniform pressure distribution and protection of material integrity: The side clamping plate has a larger pressing area than the side surface area of ​​the battery case, which effectively disperses the pressure and prevents deformation or damage caused by local stress concentration. This ensures that the material surface is flat and the dimensions are consistent after heading, maintaining the original tensile strength and facilitating subsequent cold drawing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the square aluminum alloy lithium battery shell material heading device of this utility model;

[0027] Figure 2 This is a schematic diagram showing the positions of the upper pressure plate, lower pressure plate, side clamping plate, mold core, and square battery casing of this utility model.

[0028] In the diagram, 100 is the mold core; 101 is the groove; 110 is the upper pressure plate; 120 is the lower pressure plate; 121 is the suspended section of the pressure plate; 130 is the side clamping plate; 140 is the drive mechanism; 150 is the ejector pin; and 200 is the square battery casing. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0030] like Figures 1-2 As shown, this utility model provides a head-cutting device for square aluminum alloy lithium battery casing material, including:

[0031] The mold core 100 is configured to fit into the square battery casing 200. The upper and lower end faces of the mold core 100 are provided with grooves 101 of a specific shape along the length direction.

[0032] The upper pressure plate 110 and the lower pressure plate 120 are respectively set above and below the mold core 100. During the heading process, the upper pressure plate 110 moves downward and the lower pressure plate 120 moves upward, pressing the upper and lower end faces of the square battery casing 200 to abut against the groove 101 on the mold core 100, thereby compressing the upper and lower end faces of the square battery casing 200.

[0033] Side clamps 130 are set on both sides of the mold core 100 and are used to compress the left and right sides of the square battery casing 200. After the upper pressure plate 110 and the lower pressure plate 120 have completed the compression of the upper and lower end faces of the square battery casing 200, the side clamps 130 further apply force from both sides inward, so that the square battery casing 200 is uniformly compressed and its size is reduced.

[0034] Specifically, the steps for heading the square battery casing 200 are explained below:

[0035] (1) The mold core 100 extends out, and the square battery shell 200 is placed on the mold core 100. The length of the shell 200 on the mold core 100 is determined by the heading length and the device length. Usually, the heading length is 10-30cm.

[0036] (2) The two clamping plates 130 move forward simultaneously until they reach a distance of 2000-10mm from the square battery casing and then stop moving.

[0037] (3) The upper pressure plate 110 and the lower pressure plate 120 move simultaneously until they reach the groove 101 of the mold core 100 and stop moving, pressing the groove 101 out of the square battery shell 200. At this time, the two sides of the square battery shell 200 are squeezed and expand outward and abut against the side clamping plate 130.

[0038] (4) The upper pressure plate 110 and the lower pressure plate 120 are retracted, the mold core 100 is retracted until it is completely separated from the square battery shell 200, and the side clamping plate 130 continues to move toward the square battery shell 200, flattening the square battery shell 200 by 0-30mm.

[0039] (5) The side clamp 130 is retracted, the head-cutting action is completed, and the square battery casing 200 after the head-cutting is completed is removed.

[0040] Through the above steps, the square battery casing 200 material undergoes precise compression treatment, resulting in a significant reduction in its external dimensions. This facilitates its smooth passage through the outer mold of the cold drawing die, preparing it for subsequent drawing operations.

[0041] It is worth mentioning that the heading device provided in this embodiment has at least the following advantages:

[0042] 1. Solve the problem of poor adaptability to asymmetrical shapes: By designing a mold core 100 with a specific groove 101 shape, matching upper and lower pressure plates 120, and side clamping plates 130 on both sides, it can adapt well to the irregular shape of the square battery casing 200, ensuring uniformity and stability during the heading process.

[0043] 2. Improved processing efficiency and quality: For the heading process of the 200 square battery casing, not only was the work efficiency improved, but the quality of the material after heading was also guaranteed, reducing potential problems in the subsequent cold drawing process, such as defects caused by gas pressure.

[0044] 3. Maintain material strength: By rationally designing the action sequence and force of each component, ensure that the cross-sectional area of ​​the material remains unchanged after heading, maintain the original tensile strength, which is beneficial for subsequent cold drawing processing.

[0045] Preferably, the groove 101 is configured as a V-shaped structure or an arc surface structure. At the same time, the pressing surfaces of the upper pressure plate 110 and the lower pressure plate 120 are designed to match the shape of these grooves 101. This means that if the groove 101 on the mold core 100 is V-shaped, the contact surface of the upper pressure plate 110 and the lower pressure plate 120 is also V-shaped; if the groove 101 is an arc surface, the contact surface is also adjusted to an arc surface accordingly.

[0046] Preferably, a pin 150 (not shown in the figure) is provided in the upper pressure plate 110 or the lower pressure plate 120. When the heading operation is performed, as the upper pressure plate 110 and the lower pressure plate 120 apply downward pressure, the pin 150 will penetrate into the top or bottom surface of the square battery casing 200, thereby forming an exhaust hole. The gas generated during the cold drawing process can be smoothly discharged through the pre-prepared exhaust hole, reducing the risk of increased internal pressure due to gas accumulation, preventing possible deformation or other defects, and helping to maintain the overall structural strength and surface quality of the material.

[0047] By forming vent holes directly during the heading process, the production process is simplified and the overall production efficiency is improved without the need for additional steps to manufacture these holes.

[0048] Preferably, the length of the mold core 100 is shorter than the length of the square battery casing 200. When the square battery casing 200 is fitted onto the mold core 100, at least one end of the square battery casing 200 extends beyond the mold core 100 along its length and forms a suspended section of the casing.

[0049] Meanwhile, the length of the mold core 100 is also shorter than the length of the upper pressure plate 110 and the lower pressure plate 120. When the mold core 100 is located between the upper pressure plate 110 and the lower pressure plate 120, at least one end of the upper pressure plate 110 and the lower pressure plate 120 extends beyond the mold core 100 along the length direction and forms a pressure plate suspension section 121.

[0050] Furthermore, the ejector pin 150 is disposed in the suspended section 121 of the pressure plate and is used to penetrate the suspended section of the outer casing to form an exhaust hole.

[0051] This structural design not only enables efficient and precise machining of the vent holes, but also effectively avoids interference between the ejector pin 150 and the mold core 100, effectively preventing the ejector pin 150 from touching the mold core 100 during drilling, thereby avoiding damage to the ejector pin 150 and the mold core 100 due to accidental contact, and extending the service life of the device.

[0052] Preferably, the area of ​​the extrusion surface of the side clamp 130 is larger than the area of ​​the sides of the square battery casing 200. This ensures that when the battery casing is laterally compressed, the pressure can be more evenly distributed on both sides of the battery casing. This helps to avoid uneven deformation or material damage caused by local stress concentration, and ensures that the battery casing after heading has regular dimensions and a flat surface.

[0053] Preferably, it also includes a drive mechanism 140. The mold core 100, upper pressure plate 110, lower pressure plate 120 and side clamping plate 130 are driven by an independent drive mechanism 140 to move linearly. Thus, each drive mechanism 140 can individually control the movement stroke and action sequence of the corresponding component, so that each component can act in sequence according to a preset order and force during the heading process, realizing a high-precision and highly coordinated processing process.

[0054] The drive mechanism 140 is configured as a hydraulic press or servo motor, and is equipped with a corresponding hydraulic pump station and solenoid valve.

[0055] Furthermore, the drive mechanism 140 is equipped with a limit alarm unit (not shown in the figure). This limit alarm unit is a commonly used safety protection device, so its structural composition will not be described in detail. It should be noted that when the drive mechanism 140 exceeds the preset stroke, the limit alarm unit triggers an alarm and cuts off the power to the drive mechanism 140, thereby stopping the movement of the relevant components. This effectively prevents over-stroke problems caused by misoperation, control system failure, or mechanical jamming, ensuring that the equipment will not be damaged. In continuous production or unattended automated production lines, this function is particularly important, as it can ensure that the equipment automatically stops in abnormal situations and avoids the escalation of accidents.

[0056] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0057] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0058] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0060] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A device for heading square aluminum alloy lithium battery casing material, characterized in that, include: The mold core is configured to fit into a square battery casing, and the upper and lower end faces of the mold core are provided with grooves along the length direction; An upper pressure plate and a lower pressure plate are respectively disposed above and below the mold core. The upper pressure plate and the lower pressure plate press the upper and lower end faces of the square battery casing to abut against the groove. Side clamps are set on both sides of the mold core and are used to press the left and right sides of the square battery casing.

2. The head-cutting device for square aluminum alloy lithium battery casing material according to claim 1, characterized in that, The groove is configured as a V-shaped structure or an arc surface structure, and the lower pressing surface of the upper pressure head and the lower pressure head matches the shape of the groove.

3. The head-cutting device for square aluminum alloy lithium battery casing material according to claim 1, characterized in that, The upper pressure plate or the lower pressure plate is provided with a pin, which is used to pierce the top or bottom surface of the square battery casing to form an exhaust hole.

4. The square aluminum alloy lithium battery casing material heading device according to claim 3, characterized in that, The length of the mold core is shorter than the length of the square battery casing. When the square battery casing is fitted onto the mold core, at least one end of the square battery casing extends beyond the mold core along its length, forming a suspended section of the casing.

5. The square aluminum alloy lithium battery casing material heading device according to claim 4, characterized in that, The length of the mold core is shorter than the length of the upper pressure plate and the lower pressure plate. When the mold core is located between the upper pressure plate and the lower pressure plate, at least one end of the upper pressure plate and the lower pressure plate extends beyond the mold core along the length direction and forms a suspended section of the pressure plate.

6. The square aluminum alloy lithium battery casing material heading device according to claim 5, characterized in that, The ejector pin is positioned in the suspended section of the pressure plate and is used to pierce the suspended section of the outer shell to form the vent hole.

7. The head-cutting device for square aluminum alloy lithium battery casing material according to claim 1, characterized in that, The area of ​​the pressing surface of the side clamp is larger than the area of ​​the left and right sides of the square battery casing.

8. The head-cutting device for square aluminum alloy lithium battery casing material according to claim 1, characterized in that, It also includes a drive mechanism, wherein the mold core, the upper pressure plate, the lower pressure plate, and the side clamping plate are driven by the independent drive mechanism to move linearly.

9. A head-cutting device for square aluminum alloy lithium battery casing material according to claim 8, characterized in that, The drive mechanism is configured as a hydraulic press or a servo motor.

10. A head-cutting device for square aluminum alloy lithium battery casing material according to claim 8, characterized in that, The drive mechanism is equipped with a limit alarm unit. When the drive mechanism exceeds the preset stroke, the limit alarm unit triggers an alarm and cuts off the power to the drive mechanism.

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