A welding pin positioning fixture for resistance welding

Abstract

The utility model discloses a resistance welding is with welding needle positioning fixture belongs to battery package spot welding technical field. Including two can install in spot welding equipment output end's spot welding module, spot welding module includes spot welding arm and is used for along the elevating direction clamping fixed welding needle's needle clamping plate, and the needle clamping plate is connected through multiaxis movement module between spot welding arm, and multiaxis movement module includes the first clamping seat that elevating direction sliding connection is in spot welding arm, the second clamping seat that first direction sliding connection is in the first clamping seat along perpendicular to elevating direction, and the needle clamping plate is sliding connection in the second clamping seat along perpendicular to elevating direction, first direction's second direction. A resistance welding is with welding needle positioning fixture of the utility model, can help multiaxis movement module, and the arrangement mode of two welding needles is flexibly adjusted as needed, and the spot welding demand of longitudinal, lateral shunt groove is given consideration to.

Description

Technical Field

[0001] This utility model belongs to the field of battery pack spot welding technology, specifically relating to a welding needle positioning fixture for resistance welding. Background Technology

[0002] During the battery pack welding process, the direction of the welding needles is usually determined by the direction of the shunt groove of the connecting piece, so that the two spot welding needles are located on both sides of the shunt groove, which facilitates the welding current to pass through the contact point between the connecting piece and the battery cell to form a weld point.

[0003] Existing connectors have two types of flow channels: longitudinal and transverse. However, current welding pin positioning fixtures have poor compatibility. One fixture is needed for the longitudinal flow channel, and another for the transverse flow channel, and the two are not interchangeable. Changing fixtures is time-consuming and requires skilled operation, severely reducing production efficiency. Furthermore, frequent fixture changes can lead to inaccurate welding pin positioning due to adjustment errors, resulting in welding pins not accurately aligning with the sides of the flow channel.

[0004] Therefore, there is an urgent need for a welding pin positioning fixture that can meet the needs of different spot welding. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a welding needle positioning fixture for resistance welding, which can flexibly adjust the arrangement of two welding needles as needed by means of a multi-axis moving module, taking into account the spot welding requirements of longitudinal and transverse diversion grooves.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a welding needle positioning fixture for resistance welding, comprising two spot welding modules that can be installed at the output end of a spot welding device, wherein the spot welding device can drive the two spot welding modules to move synchronously back and forth along the lifting direction; The spot welding module includes a spot welding arm and a clamping plate for clamping and fixing welding needles along the lifting direction. The clamping plate and the spot welding arm are connected by a multi-axis moving module. The multi-axis moving module includes a first clamp that is slidably connected to the spot welding arm along the lifting direction, and a second clamp that is slidably connected to the first clamp along a first direction perpendicular to the lifting direction. The needle clamp plate is slidably connected to the second clamp along a second direction perpendicular to the lifting direction and the first direction.

[0007] Optionally, the spot welding arm is provided with a shaft diameter opening groove extending through its end along the lifting direction, the first clamp is provided with a shaft connection part matching the shaft diameter opening groove, and the spot welding arm is provided with a first fastening bolt threaded through and connected to it for shrinking the shaft diameter opening groove to squeeze the shaft connection part.

[0008] Optionally, the first clamp is provided with a first linear guide groove along the first direction, and the second clamp is provided with a first guide section that matches the first linear guide groove. The first guide rail portion has a first strip-shaped through hole parallel to the extension direction of the first linear guide rail groove, and a second fastening bolt that can be threaded to the bottom of the first linear guide rail groove passes through the first strip-shaped through hole.

[0009] Optionally, the second clamp is provided with a second linear guide groove along the second direction, and the clamping plate is provided with a second guide section that matches the second linear guide groove; The second guide rail section has a second strip-shaped through hole parallel to the extension direction of the second linear guide rail groove, and a third fastening bolt that can be threaded to the bottom of the second linear guide rail groove passes through the second strip-shaped through hole.

[0010] Optionally, the first clamp and / or the second clamp may have a plurality of heat dissipation fin slots arranged in a linear array.

[0011] Optionally, one end of the clamping plate is provided with a plate-shaped clamping groove along the lifting direction, and the welding needle can be clamped into the opening end of the plate-shaped clamping groove along the lifting direction. A fourth fastening bolt for reducing the width of the opening of the plate-shaped clamping groove is threaded through and connected to the clamping plate.

[0012] Optionally, the clamping plate is in the shape of a straight line, and the opening direction of the sheet-like clamping groove is parallel to the second direction.

[0013] Optionally, the needle clamping plate is in the shape of a "T", and the opening direction of the sheet-like clamping groove is perpendicular to the second direction.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: (1) By adding a multi-axis moving module between the spot welding arm and the clamping plate, the welding needles that are clamped and fixed on the clamping plate can move flexibly with the structural changes of the multi-axis moving module, thereby enabling the two welding needles to be arranged in any way according to the requirements, so as to meet the spot welding requirements of different types of connecting pieces. (2) By setting a first clamp and a second clamp, and setting a guide rail slide structure between the first clamp and the spot welding arm, between the first clamp and the second clamp, and between the second clamp and the clamping plate, the efficiency of clamp mode switching is effectively improved. (3) By setting different types of clamping plates, the spot welding requirements of the transverse flow channel and the longitudinal flow channel can be quickly matched without adjusting the multi-axis moving module. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the welding pin positioning fixture for resistance welding in a preferred embodiment of this utility model; Figure 2 This is an exploded structural diagram of a single spot welding module in a preferred embodiment of this utility model; Figure 3 This is a preferred embodiment of the present invention. Figure 1 A top-view structural diagram; Figure 4 This is a schematic diagram of the structure of the pin clamp plate in the shape of the Chinese character in a preferred embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the needle clamp plate in the preferred embodiment of the present invention, which is in the shape of a straight line. Figure 6 In the preferred embodiment of this utility model, Figure 4 A schematic diagram showing the structure of replacing the Chinese character-shaped needle clamp with a straight needle clamp; Among them, 2 is the spot welding arm; 201 is the shaft diameter opening groove; 202 is the first fastening bolt; 3 is the needle clamping plate; 301 is the second guide rail part; 302 is the second strip-shaped through hole; 303 is the plate-shaped clamping groove; 304 is the fourth fastening bolt; 4 is the welding needle; 5 is the first clamping seat; 501 is the shaft connection part; 502 is the first linear guide rail groove; 503 is the second fastening bolt; 6 is the second clamping seat; 601 is the first guide rail part; 602 is the first strip-shaped through hole; 603 is the second linear guide rail groove; 604 is the third fastening bolt; and 56 is the heat dissipation fin groove. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0018] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. 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 indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] like Figures 1-6 As shown, a welding needle positioning fixture for resistance welding includes two spot welding modules that can be installed at the output end of a spot welding device. Specifically, the spot welding modules can be installed at the output end of the spot welding device by various methods such as bolt fastening, snap-fitting, and fastening, and the spot welding device can drive the two spot welding modules to move synchronously back and forth in the lifting direction.

[0020] The spot welding module includes a spot welding arm 2 and a clamping plate 3 for holding and fixing welding needles 4 along the lifting direction. The clamping plate 3 is connected to the spot welding arm 2 via a multi-axis moving module. The multi-axis moving module includes a first clamping seat 5 slidably connected to the spot welding arm 2 along the lifting direction, and a second clamping seat 6 slidably connected to the first clamping seat 5 along a first direction perpendicular to the lifting direction. The clamping plate 3 is slidably connected to the second clamping seat 6 along a second direction perpendicular to the lifting direction and the first direction. It should be noted that the first clamping seat 5 can be fixedly connected to the spot welding arm 2 within its stroke range, the second clamping seat 6 can be fixedly connected to the first clamping seat 5 within its stroke range, and the clamping plate 3 can be fixedly connected to the second clamping seat 6 within its stroke range. This allows the two welding needles 4, fixed by the two spot welding modules, to be flexibly adjusted in position within a relatively small range, meeting the welding requirements of different types of connecting pieces without affecting the spot welding pressure.

[0021] As described above, the spot welding arm 2, the first clamping seat 5, the second clamping seat 6, and the needle clamping plate 3 all have good electrical conductivity, and can maintain a current path for the welding needle 4 and the spot welding equipment between each other. This enables the spot welding equipment to guide a large current to the welding needle 4 through the spot welding arm 2, the multi-axis moving module and the needle clamping plate 3, and drives the spot welding module to move in the lifting direction to urge the welding needle 4 to press against the connecting piece placed at the electrode end of the cell. Under the action of the large current, local high temperature will be generated at the contact between the welding needle 4 and the connecting piece due to resistance, forming a nugget, thereby realizing the spot welding operation between the connecting piece and the cell. Meanwhile, a plurality of heat dissipation fin grooves 56 arranged in a linear array can be formed on the first clamping seat 5 and / or the second clamping seat 6 to improve their heat dissipation performance.

[0022] In this embodiment, the lifting direction corresponds to the Z-axis direction in the three-dimensional Cartesian coordinate system, the first direction corresponds to the X-axis direction in the three-dimensional Cartesian coordinate system, the second direction corresponds to the Y-axis direction in the three-dimensional Cartesian coordinate system, the lifting direction, the first direction and the second direction are perpendicular to each other, and the first direction corresponds to the extending direction of the spot welding arm 2.

[0023] Further, as shown in Figures 1-6 , one end of the needle clamping plate 3 is provided with a sheet-shaped clamping groove 303 along the lifting direction, the welding needle 4 can be snap-fitted to the open end of the sheet-shaped clamping groove 303 along the lifting direction, and a fourth fastening bolt 304 is threaded through the needle clamping plate 3. That is, the sheet-shaped clamping groove 303 can divide one end of the needle clamping plate 3 into two parts. When the fourth fastening bolt 304 passes through one part of the end of the needle clamping plate 3, passes through the sheet-shaped clamping groove 303 and is then threadedly connected with the other part, the bolt head on it can be continuously pressed against the end of the needle clamping plate 3 by continuously twisting the fourth fastening bolt 304, so as to urge the opening of the sheet-shaped clamping groove 303 to continuously shrink, thereby achieving the effect of fixing the welding needle 4.

[0024] In this embodiment, to facilitate the operator to adjust the arrangement of the two welding needles 4 in a short time, different types of needle clamping plates 3 can be selected for replacement: a straight-line-shaped needle clamping plate 3 can be selected, and the opening direction of the sheet-shaped clamping groove 303 provided on this needle clamping plate 3 is parallel to the second direction, as specifically shown in Figure 5 , Figure 6 , the welding needles 4 fixed by this needle clamping plate 3 can make the two welding needles 4 meet the spot welding requirements of the connecting piece corresponding to the "longitudinal" shunt groove while the structure of the multi-axis moving module remains unchanged; a "L"-shaped needle clamping plate 3 can also be selected, which is opposite to the straight-line-shaped needle clamping plate 3, the opening direction of the sheet-shaped clamping groove 303 provided on this needle clamping plate 3 is perpendicular to the second direction, as specifically shown in Figure 3 , Figure 4As shown, the welding needles 4 fixed by the clamping plate 3 can make the two welding needles 4 match the spot welding requirements of the connecting piece corresponding to the "lateral" diversion groove while keeping the multi-axis moving module structure unchanged.

[0025] like Figure 1 , Figure 2 As shown in Embodiment 1, the spot welding arm 2 has a shaft diameter opening groove 201 extending through its end along the lifting direction. The first clamp 5 has a shaft connection portion 501 that matches the shaft diameter opening groove 201, meaning that the shaft connection portion 501 on the first clamp 5 can move up and down along the shaft diameter opening groove 201, thereby facilitating the adjustment of the vertical height of the welding needle 4 in the lifting direction. A first fastening bolt 202 is threaded through and connected to the spot welding arm 2 to shrink the shaft diameter opening groove 201 and compress the shaft connection portion 501, so that the first clamp 5 can be fixedly connected to the spot welding arm 2 within its stroke range.

[0026] It should be noted that when the first fastening bolt 202 is not fully screwed and tightened to the spot welding arm 2, the first clamp 5 can rotate around the central axis of the shaft connection 501, thereby further increasing the flexibility of the welding needle 4 position adjustment.

[0027] Furthermore, such as Figure 2 As shown, the first clamping seat 5 is provided with a first linear guide groove 502 along a first direction, and the second clamping seat 6 is provided with a first guide section 601 that matches the first linear guide groove 502. That is, the first guide section 601 on the second clamping seat 6 can be slidably embedded in the first linear guide groove 502, and the first linear guide groove 502 can guide the first guide section 601 on the second clamping seat 6 to move linearly along the first direction. The second clamping seat 6 is provided with a second linear guide groove 603 along a second direction, and the needle clamping plate 3 is provided with a second guide section 301 that matches the second linear guide groove 603. That is, the second guide section 301 on the needle clamping plate 3 can be slidably embedded in the second linear guide, and the second linear guide can guide the second guide on the needle clamping plate 3 to move linearly along the second direction. Therefore, with the cooperation of the first clamp 5, the second clamp 6 and the clamping plate 3, the clamping plate 3 can be adjusted to any position in the horizontal plane where the first direction and the second direction are located, and the two welding needles 4, which are respectively fixed by two spot welding modules, can also be arranged in the corresponding "longitudinal" and "transverse" directions according to the arrangement direction of the diversion channel.

[0028] Furthermore, to facilitate fixing the relative positions of the first clamp 5, the second clamp 6, and the needle clamp plate 3, such as... Figure 1 , Figure 2As shown, the first guide rail portion 601 has a first strip-shaped through hole 602 parallel to the extending direction of the first linear guide rail groove 502, and a second fastening bolt 503, capable of being threadedly connected to the bottom of the first linear guide rail groove 502, passes through the first strip-shaped through hole 602. That is, when the first fastening bolt 503 is not fully threadedly connected to the bottom of the first linear guide rail groove 502, the second clamp 6 can move and adjust its position within its sliding fit stroke range with the first linear guide rail groove 502. When the first fastening bolt 503 is threadedly fastened to the bottom of the first linear guide rail groove 502, the second clamp 6 will be fixedly connected to the first clamp 5. The second guide rail portion 301 has a second strip-shaped through hole 302 parallel to the extending direction of the second linear guide rail groove 603, and a third fastening bolt 604, capable of being threadedly connected to the bottom of the second linear guide rail groove 603, passes through the second strip-shaped through hole 302. Similarly, the clamping plate 3 can be fixedly connected to the second clamp 6 within its stroke range.

[0029] It should be noted that in this technical solution, before the second fastening bolt 503 passes through the first strip-shaped through hole 602 and before the third fastening bolt 604 passes through the second strip-shaped through hole 302, washers can be fitted on the second fastening bolt 503 and the third fastening bolt 604 to increase the contact area between the second fastening bolt 503 and the outer side of the first guide rail 601, and between the third fastening bolt 604 and the outer side of the second guide rail 301, and to improve the structural stability of the multi-axis moving module when it rises and falls with the spot welding arm 2.

[0030] Meanwhile, in the above-mentioned, the cross-sections of the first linear guide groove 502 and the second linear guide groove 603 along their extension direction perpendicular to the direction of extension are rectangular, dovetail, trapezoidal, etc., preferably rectangular for ease of processing, specifically as follows: Figure 2 , Figure 4 , Figure 5 As shown.

[0031] Working principle: By adding a multi-axis moving module between the spot welding arm 2 and the clamping plate 3, the welding needle 4 clamped and fixed on the clamping plate 3 can move flexibly with the structural changes of the multi-axis moving module, thereby enabling the two welding needles 4 to be arranged arbitrarily according to the requirements to meet the spot welding requirements of different types of connecting pieces.

[0032] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A welding pin positioning fixture for resistance welding, comprising two spot welding modules capable of being mounted at the output end of a spot welding device, wherein the spot welding device can drive the two spot welding modules to move synchronously and reciprocally along the lifting direction, characterized in that: The spot welding module includes a spot welding arm (2) and a pin clamping plate (3) for clamping and fixing the welding pin (4) along the lifting direction, and the pin clamping plate (3) and the spot welding arm (2) are connected via a multi-axis movement module; The multi-axis movement module comprises a first clamping seat (5) slidably connected to the spot welding arm (2) along the lifting direction, and a second clamping seat (6) slidably connected to the first clamping seat (5) along a first direction perpendicular to the lifting direction, wherein the pin clamping plate (3) is slidably connected to the second clamping seat (6) along a second direction perpendicular to the lifting direction and the first direction.

2. The resistance welding pin positioning fixture according to claim 1, characterized in that: The spot welding arm (2) is provided with a shaft diameter open slot (201) penetrating through its end along the lifting direction, the first clamping seat (5) is provided with a shaft connection portion (501) matched with the shaft diameter open slot (201), and the spot welding arm (2) is threaded with a first fastening bolt (202) which is used to shrink the shaft diameter open slot (201) to press the shaft connection portion (501).

3. The resistance welding pin positioning fixture according to claim 1, characterized in that: The first clamping seat (5) is provided with a first linear guide groove (502) along the first direction, and the second clamping seat (6) is provided with a first guide portion (601) matched with the first linear guide groove (502); The first guide portion (601) is provided with a first strip-shaped through hole (602) parallel to the extending direction of the first linear guide groove (502), and a second fastening bolt (503) capable of being in threaded connection with the bottom of the first linear guide groove (502) penetrates through the first strip-shaped through hole (602).

4. The resistance welding pin positioning fixture according to claim 1, characterized in that: The second clamping seat (6) is provided with a second linear guide groove (603) along the second direction, and the pin clamping plate (3) is provided with a second guide portion (301) matched with the second linear guide groove (603); The second guide portion (301) is provided with a second strip-shaped through hole (302) parallel to the extending direction of the second linear guide groove (603), and a third fastening bolt (604) capable of being in threaded connection with the bottom of the second linear guide groove (603) penetrates through the second strip-shaped through hole (302).

5. The resistance welding pin positioning fixture according to claim 1, characterized in that: A plurality of heat dissipation fin grooves (56) arranged in a linear array are opened on the first clamping seat (5) and / or the second clamping seat (6).

6. The resistance welding pin positioning fixture according to claim 1, characterized in that: One end of the pin clamping plate (3) is provided with a sheet-shaped clamping groove (303) along the lifting direction, the welding pin (4) can be clamped to the open end of the sheet-shaped clamping groove (303) along the lifting direction, and the pin clamping plate (3) is threaded with a fourth fastening bolt (304) for shrinking the opening width of the sheet-shaped clamping groove (303).

7. The resistance welding pin positioning fixture according to claim 6, characterized in that: The pin clamping plate (3) is in a straight line shape, and the opening direction of the sheet-shaped clamping groove (303) is parallel to the second direction.

8. The resistance welding pin positioning fixture according to claim 6, characterized in that: The pin clamping plate (3) is in an L shape, and the opening direction of the sheet-shaped clamping groove (303) is perpendicular to the second direction.

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