A device for manufacturing a battery center pin

Abstract

The utility model discloses a preparation device of battery center needle, including frame, vibration disc, support frame, first clamping device, conveying device, processingequipment and second clamping device, vibration disc is used for making center needle single arrangement to conveying track along predetermined direction, and support frame is equipped with a plurality of first support groove, support frame is equipped with two and interval setting, and first support groove is used for placing center needle, and support frame has arranged in proper order feeding position, processing position and discharge position, first clamping device is used for moving center needle located in conveying track to the first support groove of feeding position, conveying device is equipped with removal seat, and removal seat is equipped with the second support groove with first support groove cooperation, conveying device is equipped with two groups of removal position, and removal seat can drive center needle and move between feeding position and processing position and processing and discharge position, when removal seat places center needle in the first support groove of processing position, processing equipment is used for forming the predetermined chamfer of both ends of center needle.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery center pins, and in particular to a device for preparing battery center pins. Background Technology

[0002] The cylindrical battery center pin is a key component that is inserted into the center hole of the battery core. It mainly serves a supporting function to prevent the core from collapsing and deforming inward due to internal stress during repeated use.

[0003] Existing technical solutions, such as Chinese patent CN202323145241.9, have a hollow structure with variable diameters at both ends of the center pin. After the center pin is inserted into the core, a jig can be used to open one end of the center pin, thereby tightening and shaping the core diaphragm. However, even automated equipment will produce precision deviations in the actual production process. Therefore, the end processing of the blade opening grooves at both ends requires high precision, and the processing steps are also long (such as cutting, grinding and polishing to the predetermined precision). Otherwise, there is still a risk of scratches, so its relative cost is high. Utility Model Content

[0004] The main purpose of this invention is to propose a device for preparing a battery center pin, which aims to improve the existing center pin by using extrusion molding and hot-melt forming for chamfering. When inserting the center pin into the center of the wound battery, the wear of burrs is avoided, the chamfer is smooth and stable, and the processing difficulty is reduced. The processing is stable, and the use of automated equipment effectively improves its production efficiency. Moreover, the production cost per unit can be reduced by more than 30% compared with existing products, thereby improving market competitiveness.

[0005] To achieve the above objectives, this utility model proposes a device for preparing a battery center pin, comprising: frame; A vibratory feeder, the vibratory feeder being used to individually align the center needles along a predetermined direction onto a conveyor track; The support frame has multiple first support slots, with two slots spaced apart. The first support slots are used to hold the center pin. The support frame is arranged with loading position, processing position and unloading position in sequence; A first clamping device is mounted on the frame and is used to move the center pin located on the conveying track to the first support groove at the loading position. A lifting device is provided between the conveying device and the transfer seat, and the lifting device is used to drive the transfer seat to switch between the first support groove and the second support groove in an overlapping or misaligned position. A conveying device is disposed between two support frames. The conveying device is equipped with a transfer seat, and the transfer seat is equipped with a second support groove that mates with the first support groove. The conveying device is provided with two sets of transfer positions. The transfer seat can drive the central pin to move between the loading position and the processing position, as well as between the processing and unloading positions. The processing device is located on both sides of the processing position. When the transfer seat places the center pin in the first support groove of the processing position, the processing device is used to form a predetermined chamfer on both ends of the center pin. The second clamping device is located at the unloading position. When the transfer seat moves the machined center pin to the unloading position, the second clamping device moves the machined center pin to the unloading bin.

[0006] In actual processing, the central pin is an extruded hollow structure. Step 1: The center pin is fed by a vibratory feeder, and then the center pin to be processed is moved to the first support groove of the support frame at the loading position by the first clamping device. Step 2: By using staggered support brackets and transfer seats, the center pin is sequentially moved between the loading position, processing position, and unloading position. Step 3: When the transfer seat moves to the first support groove of the processing position via the conveyor, the processing device is used to chamfer both ends of the center pin; Step 4: After the center pin is formed and chamfered, the transfer seat moves to the unloading position through the second support groove, and then moves to the unloading bin through the second clamping device, thus completing the processing.

[0007] The extruded center pin and thermoformed chamfers improve the ease of installation. Furthermore, the use of automated production equipment results in higher production efficiency and better structural stability. Attached Figure Description

[0008] Figure 1 This is a three-dimensional schematic diagram of the present utility model. Figure 1 ; Figure 2 This is a three-dimensional schematic diagram of the present utility model. Figure 2 ; Figure 3 This is a three-dimensional schematic diagram of the present utility model. Figure 3 ; Figure 4 This is a schematic diagram showing the fit between the support frame and the transfer seat; Figure 5 This is a schematic diagram showing the fit between the center pin and the forming mold.

[0009] In the picture, 100 is the center pin, 101 is the chamfer. 1 is the rack, 2 is the vibratory feeder, and 20 is the conveyor track. 3 represents the support frame, and 30 represents the first support groove. 41 is the first clamping device, and 42 is the second clamping device. 401 is a linear moving device, 402 is a first vertical moving device, 403 is a bidirectional clamping device, and 404 is a gripper. 5 is a conveying device, 50 is a transfer seat, 51 is a second support groove, 52 is a clearance groove, and 53 is a lifting device. 6 is the processing device, 60 is the horizontal moving device, 61 is the forming mold, and 62 is the inner core. 7 is the centering and alignment device. 8 is the second vertical moving device, and 80 is the pressure block. Detailed Implementation

[0010] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0011] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is 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 indication will also change accordingly.

[0012] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0013] like Figures 1 to 5 As shown, an apparatus for preparing a battery center pin includes: Rack 1; Vibrating plate 2, the vibrating plate 2 being used to arrange the center needles 100 individually along a predetermined direction to the conveying track 20; The support frame 3 is provided with a plurality of first support grooves 30. The support frame 3 has two grooves that are spaced apart. The first support grooves 30 are used to place the center pin 100. The support frame 3 is arranged with a loading position, a processing position and a unloading position in sequence; The first clamping device 41 is provided on the frame 1 and is used to move the center pin 100 located on the conveying track 20 to the first support groove 30 at the loading position. The conveying device 5 is located between two support frames 3. The conveying device 5 is provided with a transfer seat 50. The transfer seat 50 is provided with a second support groove 51 that cooperates with the first support groove 30. A lifting device is provided between the conveying device and the transfer seat. The lifting device is used to drive the transfer seat so that the first support groove and the second support groove switch between overlapping or misaligned positions. The conveying device 5 is provided with two sets of transfer positions. The transfer seat 50 can drive the center needle 100 to move between the loading position and the processing position, and between the processing and unloading positions. The processing device 6 is located on both sides of the processing position. When the transfer seat 50 places the center pin 100 in the first support groove 30 of the processing position, the processing device 6 is used to form a predetermined chamfer 101 on both ends of the center pin 100. The second clamping device 42 is located at the unloading position. When the transfer seat 50 moves the machined center needle 100 to the unloading position, the second clamping device 42 moves the machined center needle 100 to the unloading bin.

[0014] In actual processing, the center pin 100 is an extruded hollow structure. Step 1: The center needle 100 is fed by the vibrating plate 2, and then the center needle 100 to be processed is moved to the first support groove 30 of the support frame 3 at the loading position by the first clamping device 41. Step 2: By using the staggered support frame 3 and transfer seat 50, the center pin 100 is sequentially moved between the loading position, processing position, and unloading position. Step 3: When the transfer seat 50 moves to the first support groove 30 of the processing position via the conveying device 5, the processing device 6 is used to chamfer 101 on both ends of the center pin 100. Step 4: After the center pin 100 forms the chamfer 101, the transfer seat 50 moves to the unloading position through the second support groove 51, and then moves to the unloading bin through the second clamping device 42, thus completing the processing.

[0015] The extruded center pin 100 and the thermoformed chamfer 101 improve the ease of installation of the center pin 100. At the same time, the use of automated production equipment results in higher production efficiency and better structural stability.

[0016] The overall processing flow of this application is as follows: Step 1: Select polypropylene (PP) material and place it into the extruder hopper. Step 2: Extrude pipes using hot-melt polypropylene (PP) material at 190-210℃ through an extruder; Step 3: Cool the pipe and allow it to crystallize to 92%-96%; Step 4: Trim both ends of the pipe to make them flat; Step 5: The cut pipe is fed into a vibratory feeder, which automatically feeds the pipe to the double-head hot melt chamfering 101 equipment (i.e., the technical solution of this application). Step 6: Pre-processing with the double-headed hot melt chamfering 101 equipment, and forming a chamfer 101 at a predetermined angle on the outer walls of both ends of the pipe by the inner and outer molds of the double-headed hot melt chamfering 101 equipment through temperature and pressure curves, i.e. forming the center pin 100.

[0017] Specifically, the cylindrical battery center pin 100 structure includes a polypropylene extruded tube, the tube having an inner cavity. The outer walls at both ends of the hollow tube are hot-melted and formed with a chamfered 101 hollow structure tube. The inclination of the chamfer 101 (based on the axis) is 20°-30° for the hot-melt chamfer 101 surface. The inner diameter of the cavity is a predetermined value of ±0.05 mm; the roughness Ra of the chamfer 101 is ≤0.1 μm.

[0018] The beneficial effects of the central pin 100 structure in this application are as follows: 1. Regarding step two, PP low-temperature extrusion is used: processing temperature is 190-210℃ (to avoid degradation), swelling rate is ≤0.5%, that is, the structural support of the center pin 100 is improved through the material and extrusion molding method; 2. Regarding step three, the preferred crystallization is 95% (i.e., the part with chamfer 101), in which the highly crystalline and dense layer blocks electrolyte penetration (240h swelling experiment: 0.5% vs 1.5%). 3. Regarding the structural strength temperature of the molded center pin 100, the low-temperature toughness and impact strength at -30℃ are 22kJ / m. 2 ; 4. The chamfer 101 is formed by hot melt molding. When the center needle 100 is inserted into the center of the wound battery, the wear of burrs is avoided. The chamfer 101 is smooth and stable, which also reduces the processing difficulty and makes the processing stable.

[0019] Specifically, a centering alignment device 7 is provided on both sides of the feeding position. The centering and alignment device 7 includes a first telescopic motor and a correction plate disposed at the drive end of the first telescopic motor. The first telescopic motor is used to drive the correction plate to move between a position close to the support frame 3 and a position far away from the support frame 3. After aligning the two ends of the center pin 100, it is moved to the processing position by the transfer seat 50.

[0020] In this embodiment of the present invention, the first clamping device 41 and the second clamping device 42 have the same structure, including a linear moving device 401 disposed on the top wall of the frame 1, a first vertical moving device 402 disposed on the linear moving device 401, and a bidirectional clamping device 403 disposed on the first vertical moving device 402. The bidirectional clamping device 403 is equipped with a clamping jaw 404 at its driving end. The bidirectional clamping device 403 is provided with multiple sets, thereby realizing the simultaneous processing of multiple center pins 100.

[0021] Specifically, the transfer seat 50 is provided with a relief groove 52 in the middle, wherein the relief groove 52 is used for the clamping device to extend into.

[0022] In this embodiment of the present invention, when the center pin 100 is placed in the first support groove 30, both ends of the center pin 100 extend out of the first support groove 30, that is, the width of the support bracket 3 is less than the length of the center pin 100.

[0023] Specifically, a second vertical moving device is provided above the processing position. The second vertical moving device is provided with a pressure block. The pressure block is similar in shape to the second support groove 51. That is, during processing, the center pin 100 needs to be pressed tightly to fix it.

[0024] In this embodiment of the present invention, the second support groove 51 is gradually widened from bottom to top, and the cross-section of the pressure block is trapezoidal, thereby realizing the guide insertion and pressing the center pin 100.

[0025] Specifically, the processing device 6 is a laser processing device and a molding device; The processing device 6 is a high-frequency heating device and a spinning forming device.

[0026] Specifically, the tube end is softened by laser and then molded with a chamfer of 101. The laser wavelength is 1064nm and the power is 50W. Alternatively, it is spun after high-frequency induction heating, with the high-frequency induction heating frequency being 200kHz.

[0027] In this embodiment of the invention, the processing device 6 includes a forming mold 61 and a high-frequency generator for heating the forming mold 61. The forming mold 61 is mounted on a horizontal moving device 60. The horizontal moving device 60 is used to drive the molding die 61 to move between the end near the product and the end away from the product; The molding mold 61 includes a molding cavity, a chamfered molding wall (i.e., an inclined surface) 101 disposed within the molding cavity, and an inner core 62 disposed within the molding cavity. In actual processing, high-frequency heating is used to ensure precise heating and faster heating efficiency. The forming mold 61 is then moved by a third moving device.

[0028] Multiple forming molds 61 are provided to achieve simultaneous forming.

[0029] Specifically, the inner core 62 is a ceramic mandrel, which serves as a support. The chamfer 101 has an angle of 20°-30° (a guide angle <20° is prone to jamming, and >30° damages the diaphragm). The tolerance of the chamfer 101 is ±0.5°. The pretreatment is self-lubricating to the inner mold. When hot-melting the chamfer 101, the inner diameter is monitored in real time by laser. Any fluctuation >±0.03mm is automatically rejected.

[0030] The surface roughness Ra of the chamfer 101 of the center pin 100 is ≤0.1μm.

[0031] The outer diameter is radially compressed (reduction rate 25%~30%) using a 20°-30° tapered die at 160-180℃, while the inner diameter accuracy tolerance is maintained at ±0.05mm. Replacing the traditional two-step process of "narrowing + polishing", equipment investment is reduced by 70%; Mechanism of no post-treatment: PP has high crystallinity (>95%) and naturally low surface energy (29mN / m), with an electrolyte contact angle >90°, so no fluorinated coating is required.

[0032] The chamfered 101 edge with a radius of 0.1mm rounded corner effectively avoids and eliminates microscopic burrs.

[0033] The forming cavity and inner core 62 of the double-head hot melt chamfering 101 device form a chamfer of a predetermined angle on the outer walls of both ends of the tube (i.e., the hollow center needle 100) through a temperature and pressure curve.

[0034] The moving device can be either a telescopic motor or a lead screw pair.

[0035] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An apparatus for preparing a battery center pin, characterized in that, include: frame; A vibratory feeder, the vibratory feeder being used to individually align the center needles along a predetermined direction onto a conveyor track; The support frame has multiple first support slots, with two slots spaced apart. The first support slots are used to hold the center pin. The support frame is arranged with loading position, processing position and unloading position in sequence; A first clamping device is provided on the frame and is used to move the center pin located on the conveying track to the first support groove at the loading position. A conveying device is provided between two support frames. The conveying device is provided with a transfer seat. The transfer seat is provided with a second support groove that cooperates with the first support groove. A lifting device is provided between the conveying device and the transfer seat. The lifting device is used to drive the transfer seat so that the first support groove and the second support groove switch between overlapping or misaligned positions. The conveying device is provided with two sets of transfer positions. The transfer seat can drive the central pin to move between the loading position and the processing position, as well as between the processing and unloading positions. The processing device is located on both sides of the processing position. When the transfer seat places the center pin in the first support groove of the processing position, the processing device is used to form a predetermined chamfer on both ends of the center pin. The second clamping device is located at the unloading position. When the transfer seat moves the machined center pin to the unloading position, the second clamping device moves the machined center pin to the unloading bin.

2. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: The feeding station is equipped with centering alignment devices on both sides. The centering and alignment device includes a first telescopic motor and a correction plate disposed at the drive end of the first telescopic motor. The first telescopic motor is used to move the correction plate between a position close to the support frame and a position far away from the support frame.

3. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: The first clamping device and the second clamping device have the same structure, including a linear moving device disposed on the top wall of the frame, a first vertical moving device disposed on the linear moving device, and a bidirectional clamping device disposed on the first vertical moving device. The bidirectional clamping device is equipped with grippers at its drive end.

4. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: The transfer seat has a clearance groove in the middle.

5. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: When the center pin is placed in the first support groove, both ends of the center pin extend out of the first support groove.

6. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: A second vertical moving device is provided above the processing position. The second vertical moving device is provided with a pressure block, which is similar in shape to the second support groove.

7. The apparatus for preparing the battery center pin as described in claim 6, characterized in that: The second support groove is gradually widened from bottom to top, and the cross-section of the pressure block is trapezoidal.

8. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: The processing equipment includes a laser processing device and a molding device; The processing device is a high-frequency heating device and a spinning forming device.

9. The apparatus for preparing the battery center pin as described in claim 1, characterized in that: The processing device includes a forming mold and a high-frequency generator for heating the forming mold. The forming mold is mounted on a horizontal moving device. The horizontal moving device is used to drive the molding die to move between the end near the product and the end away from the product; The molding mold includes a molding cavity, a chamfered molding wall disposed within the molding cavity, and an inner core disposed within the molding cavity.

10. The apparatus for preparing the battery center pin as described in claim 9, characterized in that: The inner core is a ceramic mandrel.

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