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CN-224222943-U - Guide insulating sleeve and spot welder using same

CN224222943UCN 224222943 UCN224222943 UCN 224222943UCN-224222943-U

Abstract

The utility model provides a guide insulating sleeve (12) and a spot welder (1) using the same. The guide insulating sleeve (12) is used for guiding and insulating a welding rod (7) of a spot welding machine (1), and is characterized by sequentially comprising a square base (121), a sleeve (122) and a center correction guide hole (123) from top to bottom, wherein cavities (12 a) are formed in the square base (121) and the sleeve (122), a clearance sliding matching structure can be formed between the square base and a mounting seat (7 a) of the welding rod (7), the center correction guide hole (123) is extendably arranged on the lower surface of the sleeve (122) and is hollow and tubular, a hollow hole (12 b) is formed in the center correction guide hole, and an electrode (7 b) of the welding rod (7) can be inserted into the hollow hole (12 b). By using the spot welder (1) with the guide insulating sleeve (12), the shaking and tilting of the welding rod (7) during the welding of the bottom of the battery can be effectively restrained, and the external short shunt during the welding can be avoided.

Inventors

  • XIA XIN
  • ZHAO FAN

Assignees

  • 松下新能源(无锡)有限公司

Dates

Publication Date
20260512
Application Date
20250415

Claims (12)

  1. 1. A guiding insulation sleeve (12) is used for guiding and insulating a welding rod (7) of a spot welder (1), and is characterized by sequentially comprising a square base (121), a sleeve (122) and a center correction guide hole (123) from top to bottom, The square base (121) and the sleeve (122) are internally provided with a cavity (12 a) which can form a clearance sliding fit structure with the mounting seat (7 a) of the welding rod (7), The center correction guide hole (123) is extendedly arranged on the lower surface of the sleeve (122), is hollow and tubular, and is internally provided with a hollow hole (12 b), and the electrode (7 b) of the welding rod (7) can be inserted into the hollow hole (12 b).
  2. 2. The guide insulator sleeve of claim 1 wherein the guide insulator sleeve is formed from a material, The square base (121) has a base portion (121 a) and two side walls (121 b) extending upward from both sides of the base portion (121 a), and a notch (121 c) is formed between the two side walls (121 b).
  3. 3. The guide insulator sleeve of claim 2 wherein the guide insulator sleeve is formed from a material, When the height of the base portion (121 a) of the square base (121) is H 0 , the height of the sleeve (122) is H 1 , and the height of the mount base (7 a) of the welding rod (7) is H 3 , H 3 =H 0 +H 1 is satisfied.
  4. 4. The guide insulator sleeve of claim 3 wherein the guide insulator sleeve is formed from a material, L 1 ＜L 3 -L 2 - H 2 is satisfied when the height of the side wall (121 b) of the square base (121) is H 2 , the length of the electrode (7 b) of the welding rod (7) is L 3 , the height of the battery (10) as a welding object is L 2 , and the extension length of the center correction guide hole (123) is L 1 .
  5. 5. The guide insulating sleeve according to claim 1 or 2, wherein, A difference (phi Hollow hole -Φ Electrode ) between a diameter (phi Hollow hole ) of the hollow hole (12 b) of the center correction guide hole (123) and an outer diameter (phi Electrode ) of the electrode (7 b) of the welding rod (7) is in a range of 0.02-0.10 mm.
  6. 6. The guide insulating sleeve according to claim 1 or 2, wherein, The lower end of the center correcting guide hole (123) is provided with a guide conical surface (123 a) inclined inwards, and the guide angle of the guide conical surface is 4-15 degrees.
  7. 7. The guide insulating sleeve according to claim 1 or 2, characterized in that the center correcting guide hole (123) is formed of an insulating material.
  8. 8. A spot welder (1) for welding the bottom of a battery (10), wherein the battery (10) is provided with a winding type battery cell (10 a) and a battery case (10 c) with one end open, characterized in that, At least comprises an upper electrode (4), a lower electrode (5), a welding rod (7), a pressurizing head (9), a detection system, a control device, and the guide insulating sleeve (12) according to any one of claims 1 to 7, The detection system detects the position of a central hole (10 b) of the winding type battery cell (10 a) and the position of the welding rod (7); the welding rod (7) is inserted into the guide insulating sleeve (12), The guide insulating sleeve (12) is connected with the control device, The control device controls the displacement of the welding rod (7) through the guide insulating sleeve (12) according to the detection result of the detection system, so that the electrode (7 b) of the welding rod (7) is inserted into the central hole (10 b) of the winding type battery cell (10 a), When the electrode (7 b) of the welding rod (7) reaches the bottom of the battery case (10 c), the pressurizing head (9) drives the upper electrode (4) to move downwards, the upper electrode (4) is conducted with the lower electrode (5) through the welding rod (7), and welding current is applied in a pressurizing state, so that the negative electrode lead of the winding type battery cell (10 a) and the bottom of the battery case (10 c) are welded together.
  9. 9. The spot welder of claim 8, wherein, The detection system comprises a camera which detects the position of the central hole of the coiled battery cell, The control device controls the displacement of the welding rod on the X axis and the Y axis of the horizontal plane through the guide insulating sleeve (12) according to the detection result of the camera.
  10. 10. The spot welder according to claim 8 or 9, wherein, The detection system comprises a photoelectric sensor (13), the photoelectric sensor (13) is arranged on the side surface of the guide insulating sleeve (12) to detect the floating state of the welding rod (7), The control device controls the displacement of the Z axis of the welding rod in the vertical direction through the guide insulating sleeve (12) according to the detection result of the photoelectric sensor (13).
  11. 11. The spot welder of claim 10, wherein the spot welder is configured to move the spot welding machine, The square base (121) has a base part (121 a) and two side walls (121 b) extending upward from both sides of the base part (121 a), a gap (121 c) is provided between the two side walls (121 b), The photoelectric sensor (13) is arranged between the two side walls (121 b) and is in a level position with the upper edge of the base part (121 a), and a light beam emitted by the photoelectric sensor (13) can pass through the notch (121 c).
  12. 12. The spot welder of claim 10, wherein the control means controls the welding rod to continue to move downward along the Z-axis until the electrode of the welding rod is completely inserted into the center hole of the winding type cell and reaches the bottom of the battery case when the monitoring result of the photo sensor is "abnormal floating of the welding rod is not detected", and stops the downward movement of the Z-axis of the welding rod when the monitoring result of the photo sensor is "abnormal floating of the welding rod is detected", and stops the welding operation.

Description

Guide insulating sleeve and spot welder using same Technical Field The utility model relates to a guide insulating sleeve and a spot welder using the same. Background The spot welder adopts the principle of resistance welding, the upper electrode and the lower electrode are connected through a welding rod, welding current flows through the joint of the weldment, and heat is generated by using the resistance of the weldment, so that metal at the joint of the weldment is melted, and a welding joint is formed. In the production of batteries, spot welders are used for bottom welding of cylindrical batteries, i.e., a welding rod is inserted into a central hole of a wound cell of the battery, and a welding current is conducted between upper and lower electrodes, thereby welding a negative electrode lead of the cell with the bottom of a battery case. Spot welding machines on the market are moving towards automation, intellectualization and high precision. In order to improve the welding quality and production stability of the bottom welding of the battery, spot welders are generally provided with guide sleeves for accurately positioning and guiding the displacement of the welding rod, so as to ensure that the welding rod can be aligned with a target position during the welding process. Fig. 7 is a perspective view of a welding rod (7) used in the spot welding machine, wherein one end of the welding rod (7) is a cylindrical mounting seat (7 a) and the other end is a rod-shaped electrode (7 b), as shown in fig. 7. Fig. 8 is a plan view of the battery (10) to be welded. The battery (10) has a winding type cell (10 a) and a battery case (10 c) having one end open, and as shown in fig. 8, the winding type cell (10 a) has a center hole (10 b) in the axial center. Fig. 9 is a schematic view of a spot welder used in the related art. As shown in FIG. 9, the spot welding machine (1) is provided with a frame (2), an upper electrode (4) connected to the frame (2) via an electrode arm (3), a lower electrode (5), and a guide sleeve (6), wherein the guide sleeve (6) is positioned between the upper and lower electrodes (4, 5), and a welding rod (7) is inserted into the guide sleeve (6). A pressure sensor (8) and a pressurizing head (9) are provided above the upper electrode (4), and a battery (10) to be welded is located between the welding rod (7) and the lower electrode (5). A control system (not shown) of the spot welding machine (1) can control the movement of the welding rod (7) through the guide sleeve (6). When the bottom of the battery is welded, first, the lower electrode (5) is lifted up to contact the bottom of the battery (10), the guide sleeve (6) is pressed down with the welding rod (7), and the electrode (7 b) of the welding rod (7) is inserted into the central hole (10 b) of the battery (10). Then, the pressurizing head (9) presses down the upper electrode (4) under the control of the operation servo system, and the upper electrode (4) is conducted with the lower electrode (5) through the welding rod (7), thereby performing welding in a pressurized state. Fig. 10 is a schematic view of the structure of a guide bush (6) used in spot welding in the related art. As shown in the perspective view of fig. 10 (a), the guide sleeve (6) includes an upper square base (61) and a lower cylindrical sleeve (62), and the square base (61) or the sleeve (62) can be connected to an external control device via an electrode arm. As shown in the cross-sectional view of fig. 10 (b), the guide bush (6) has a cylindrical cavity (6 a) in the center, the circumferential surface of the cavity (6 a) forms a positioning surface, and the cylindrical mount (7 a) of the welding rod (7) is slidable up and down in the cavity (6 a). Fig. 11 is a schematic view showing a state of use of a conventional guide bush (6), in which (a) shows an initial state before a welding rod is inserted into a cell, (b) shows a final state after the welding rod is inserted into the cell, and (c) shows a welding state. As shown in fig. 11, the prior art has a problem that the mounting seat (7 a) of the welding rod and the cavity (6 a) of the guide sleeve are in a clearance sliding fit structure, when the welding rod (7) is in a final state after the battery cell is inserted as shown in fig. 11 (b), the mounting seat (7 a) of the welding rod (7) extends out of the square base (61) longer, and the positioning surface of the mounting seat (7 a) of the welding rod (7) is reduced by the cavity (6 a) of the guide sleeve (6), so that the welding rod (7) is easy to shake and incline. If the welding rod (7) tilts, the welding rod (7) is not stably contacted with the bottom of the battery case and the negative electrode lead (not shown) in a welding state, and welding spot deviation and unstable discharge current are easily caused. Further, as shown in fig. 11 (c), when the inner bending angle of the positive electrode collector above the winding cell (10 a) is not uniform, the