Electrode bar and spot welding device

Abstract

The utility model provides a novel electrode bar and a spot welding device. The electrode bar is used for welding a guide plate having a plurality of bumps to a battery, the guide plate including two sheet-shaped portions connected to each other, each of the two sheet-shaped portions having two bumps arranged in a first direction, the two sheet-shaped portions facing each other at a distance in a second direction orthogonal to the first direction, the shape of the electrode bar is formed in a way that a first width in the first direction is larger than the distance between two adjacent salient points of the guide plate in the first direction, and a second width in the second direction is not larger than half of the maximum distance between the two sheet-shaped parts in the second direction.

Description

Technical Field

[0001] This utility model relates to an electrode rod and a spot welding device. Background Technology

[0002] With the development of electronic products, the requirements for battery packs and circuit devices that serve as the power source for these electronic products are constantly increasing. Various studies are being conducted on their safety and other performance characteristics, battery connection structures, and production processes such as production efficiency.

[0003] In existing technologies, conductive plates are welded to the positive and negative electrodes of a single cell, facilitating the electrical connection of the positive and negative electrodes to a wire harness or other conductive bodies such as batteries. During this welding operation, for example, two electrode rods are used to weld the conductive plate to the positive and negative electrodes of the single cell in a 2-to-4-point welding method. The 2-to-4-point welding method refers to welding the four protrusions on the conductive plate twice, one after the other, using two electrode rods to weld each of the four protrusions to the positive and negative electrodes of the single cell.

[0004] However, when using a 2-to-4-point welding method, after the two protrusions are welded and fixed in the first weld, the guide plate is prone to deformation and warping during the second weld. Furthermore, due to the concentrated pressure applied by the spot welding heads in this method, the negative electrode is easily deformed and sunken after welding. Consequently, because this welding method involves two welds on a single guide plate, the work efficiency is low. Utility Model Content

[0005] In view of the above, the inventor of this utility model has conducted in-depth research and proposed a new type of electrode rod and spot welding device, which can achieve 1 welding of 4 points, that is, only 1 welding is required for 4 protrusions, thereby suppressing the deformation of the guide plate, avoiding the negative electrode denting and deformation, and improving the work efficiency.

[0006] The technical solution of this utility model is as follows.

[0007] This utility model provides an electrode rod used to weld a guide plate with multiple protrusions to a battery. The guide plate includes two interconnected sheet-like portions, each of which has two protrusions arranged in a first direction and facing each other at a distance in a second direction orthogonal to the first direction. The electrode rod is configured such that its first width in the first direction is greater than the distance between two adjacent protrusions of the guide plate in the first direction, and its second width in the second direction does not exceed half of the maximum distance between the two sheet-like portions in the second direction.

[0008] Furthermore, the electrode rod is preferably an incomplete cylinder with a cut edge on one side, the first width being the diameter of the cylinder, and the second width being the sum of the chord distance of the cut edge and the radius of the cylinder.

[0009] Furthermore, it is preferable that the second width of the electrode rod is smaller than the distance between two adjacent protrusions of the guide plate in the second direction.

[0010] Furthermore, it is preferable that the second width of the electrode rod is not less than the width of each of the two sheet-like portions in the second direction.

[0011] Furthermore, it is preferred that the first width of the electrode rod is 4.0 mm and the second width is 3.35 mm.

[0012] Furthermore, this utility model provides a spot welding device, characterized in that it comprises: two electrode rods as described above; a fixture for holding the two electrode rods so that the two electrode rods are positioned opposite each other at a distance in the second direction; and a power supply for connecting the positive and negative terminals to the two electrode rods respectively.

[0013] Furthermore, preferably, the distance between the two electrode rods in the second direction does not exceed twice the difference between the first width and the second width. Attached Figure Description

[0014] Figure 1 This is a perspective view schematically showing the electrode rod 110 of this utility model.

[0015] Figure 2 The front view of the spot welding head 111 of this utility model is shown schematically.

[0016] Figure 3 This is a front view schematically showing the overall structure of the guide plate 300 used in this utility model.

[0017] Figure 4 This is a perspective view illustrating welding performed by the spot welding device 100 of this utility model.

[0018] Figure 5 This is a top view schematically showing the spot welding device 100 of this utility model performing welding. Detailed Implementation

[0019] The embodiments of this utility model will now be described using the accompanying drawings. However, various limitations, technically preferred for carrying out this utility model, are added to the embodiments described below. Therefore, the scope of this disclosure is not limited to the following embodiments and the illustrated examples. Furthermore, the sizes, shapes, and proportions in the illustrated examples are merely illustrative and do not represent specific sizes, shapes, and proportions. In addition, common components in the embodiments are labeled with the same symbols in the drawings, and repeated descriptions are omitted.

[0020] Figure 1 This is a perspective view schematically illustrating the electrode rod 110 of this utility model. Figure 1 As shown, the electrode rod 110 is a metal rod-shaped body, including a spot welding head 111 located at one end of the rod-shaped body. By connecting the electrode rod 110 to a power source (not shown), welding can be performed when the power is turned on and the electrode rod 110 discharges. The electrode rod 110 is an exposed conductor, but it may also have an insulating shell partially provided on its exterior. The shape of the electrode rod 110 is, for example, an incomplete cylinder with one side cut off, so that the electrode rod 110 has different width dimensions in different directions.

[0021] Figure 2 The image shows a schematic front view of the spot welding head 111 of this utility model. Figure 2 As shown, the spot welding head 111, serving as one end of the electrode rod 110, is formed as a circle with one side cut off. Figure 2 When the vertical direction is taken as the first direction (i.e., the vertical direction in the plane where welding is performed is taken as the first direction), and the horizontal direction is taken as the second direction (i.e., the horizontal direction in the plane where welding is performed is taken as the second direction), the width of the spot weld head 111 in the first direction is a first width d1, which is equal to the diameter of the cylinder. In the second direction, the width of the spot weld head 111 is a second width d2, which is the dimension obtained by subtracting the cut-off edge from the diameter of the cylinder. In other words, the second width d2 is equal to the diameter of the cut-off edge (i.e., the vertical direction in the plane where welding is performed is taken as the first direction). Figure 2 The sum of the distance c from the center of the chord (the chord obtained after the circle is cut) and the radius d1 / 2 of the cylinder.

[0022] Specifically, the electrode rod 110 is preferably an incomplete cylinder formed by cutting 0.65 mm off one side of a concentric cylinder with a diameter of 4.0 mm. That is, the first width d1 is preferably 4.0 mm and the second width d2 is preferably 3.35 mm, thereby facilitating the welding between the guide plate 300, which includes four protrusions 311, and the single cell 200, as described below. The structure of the guide plate 300 is described in detail below.

[0023] Figure 3 This is a front view schematically illustrating the overall structure of the guide plate 300 used in this utility model. (See attached image.) Figure 3As shown, the guide plate 300 to be welded is, for example, an L-shaped guide plate, having a first surface for welding to the end faces where the positive and negative electrodes of the single cell 200 are located. Figure 3 The first surface is shown as a plane, and the second surface is orthogonal to the first surface via a bend, which is disposed on the side of the single cell 200 after welding.

[0024] Furthermore, the first surface of the guide plate 300 includes two interconnected sheet-like portions 310. Each of the two sheet-like portions 310 has two protrusions 311 arranged in a first direction and facing each other at a distance from each other in a second direction. That is, the first surface of the guide plate 300 is configured such that a guide plate flow divider groove is spaced between the two sheet-like portions 310. The protrusions 311 on each sheet-like portion 310 are of the same size, for example, with a diameter of 1.0 mm. The distance b (maximum distance) between the two protrusions 311 on the same sheet-like portion 310 is, for example, 3.0 mm, and the distance a (maximum distance) between the two sheet-like portions 310 in the second direction is, for example, 7.0 mm.

[0025] The dimensions of the electrode rod 110 and the dimensions and spacing of the protrusions 311 described above are merely examples. As long as the first width d1 is greater than the spacing b between the two protrusions 311, so that the electrode rod 110 can simultaneously weld the two protrusions 311 on the same side of the sheet portion 310; and the second width d2 does not exceed half of the distance a between the two sheet portions 310 in the second direction, so that the electrode rod 110 does not interfere with the sheet portion on the other side when welding the two protrusions 311 on the same side of the sheet portion 310.

[0026] The following describes in detail the application of the electrode rod 110 in the welding operation between a guide plate with multiple protrusions and a battery.

[0027] Figure 4 This is a perspective view illustrating welding performed by the spot welding device 100 of this utility model. Figure 4 As shown, the spot welding apparatus 100 includes two electrode rods 110 as described above, a fixture 120, and a power supply 130. The fixture 120 clamps the two electrode rods 110 so that their cross-sections are positioned opposite each other at a distance. In other words, the fixture 120 positions the two electrode rods 110 at a distance in a second direction. The fixture 120 can be any fastening mechanism as long as it can maintain the positional relationship of the two electrode rods 110, so its illustration is simplified. The positive and negative terminals of the power supply 130 are respectively connected to the two electrode rods 110. By turning on the power supply 130, electricity is supplied to the electrode rods 110 to perform welding. In addition, the spot welding apparatus 100 may also have a drive mechanism (not shown) to drive the fixture 120 to move, thereby controlling the position of the two electrode rods 110.

[0028] Specifically, the fixture 120 clamps two electrode rods 110 such that the cross-sections of each electrode rod 110 in the second direction do not exceed the axis of symmetry AA of the two sheet-like portions 310 in the first direction. In other words, the cross-sections of each electrode rod 110 in the second direction do not exceed the centerline of the guide plate diversion groove between the two sheet-like portions 310. Furthermore, the fixture 120 clamps the two electrode rods 110 such that the distance between the cross-sections of the two electrode rods 110 in the second direction does not exceed the distance between the two sheet-like portions 310. Even further, the distance between the cross-sections of the two electrode rods 110 in the second direction does not exceed twice the difference between the first width d1 and the second width d2. In other words, because the distance between the two sheet-like portions 310 is small, if the electrode rod 110 is a complete cylinder and its size allows for simultaneous welding of two protrusions 311 on the same side sheet-like portion 310, interference will occur between the two electrode rods 110. By setting the shape of the electrode rod 110 as an incomplete cylinder with one side cut off, while ensuring that one electrode rod 110 can simultaneously weld two protrusions 311 on the same side of the sheet portion 310, the two electrode rods 110 connected to the positive and negative terminals of the power supply 130 do not interfere with each other. Thus, by using the two electrode rods 110 to perform welding once, it is possible to achieve 1 welding of 4 points.

[0029] Figure 5 This is a top view schematically illustrating welding performed by the spot welding device 100 of this utility model. (See attached image.) Figure 5 As shown, during a 1-to-4 point welding operation, the first width d1 of the electrode rod 110 is greater than the distance b between the two protrusions 311, thus one electrode rod 110 can simultaneously weld two protrusions 311 on the same side of the sheet-like portion 310. Furthermore, the second width d2 of the electrode rod 110 does not exceed the axis of symmetry AA in the second direction, therefore the electrode rod 110 does not interfere with the sheet-like portion 310 on the other side, nor with the electrode rod 110 on the other side. Moreover, the second width d2 of the electrode rod 110 is not less than the width L in the second direction of the sheet-like portion 310, so during the welding operation, the spot welding head 111 of the electrode rod 110 can cover the entire width of the sheet-like portion 310, facilitating welding positioning.

[0030] By using the electrode rod 110 constructed as described above and the spot welding device 100 employing the electrode rod 110, it is possible to achieve 1-to-4 spot welding, avoiding deformation and warping of the sheet-like portion 310 caused by two welding operations. Furthermore, since the size of the spot welding head 111 is larger than that of 2-to-4 spot welding, it avoids negative electrode depression and deformation of the single cell 200 after welding caused by concentrated pressure. Moreover, by achieving 1-to-4 spot welding, the overall efficiency of the welding operation is improved, and the service life of the spot welding device 100 employing the electrode rod 110 is also extended.

[0031] Furthermore, although the above description uses an incomplete cylinder with one side cut off as the shape of the electrode rod 110, other shapes of electrode rods 110 can also be used, as long as the first width d1 of the electrode rod 110 is greater than the distance b between the two protrusions 311, and the second width d2 of the electrode rod 110 does not exceed half the distance a between the two sheet-like portions 310 in the second direction. For example, an elliptical cylindrical or rectangular electrode rod 110 can also be used. When using an elliptical cylindrical or rectangular isoaxially symmetrical electrode rod 110, it is only necessary to set the second width d2 to be less than the distance between two adjacent protrusions 311 of the guide plate 300 in the second direction (i.e., the two protrusions including one protrusion 311 of each of the two sheet-like portions 310 on different sides).

[0032] This utility model can be modified in various ways without departing from its spirit and essence. These embodiments and their variations are all included within the scope or spirit of the utility model, and simultaneously within the scope of the claims and their equivalents.

Claims

1. An electrode rod, characterized in that, The electrode rod is used to weld the guide plate with multiple protrusions to the battery. The guide plate includes two interconnected sheet-like portions, each having two protrusions arranged in a first direction and facing each other at a distance in a second direction orthogonal to the first direction. The electrode rod is configured in the following shape: The first width in the first direction is greater than the distance between two adjacent protrusions of the guide plate in the first direction. The second width in the second direction does not exceed half of the maximum spacing between the two sheet-like portions in the second direction.

2. The electrode rod as described in claim 1, characterized in that, The electrode rod is an incomplete cylinder with one side cut off. The first width is the diameter of the cylinder. The second width is the sum of the chord distance of the tangent edge and the radius of the cylinder.

3. The electrode rod as described in claim 2, characterized in that, The second width is less than the distance between two adjacent protrusions of the guide plate in the second direction.

4. The electrode rod as described in claim 3, characterized in that, The second width is not less than the width of each of the two sheet-like portions in the second direction.

5. The electrode rod as described in claim 2, characterized in that, The first width is 4.0 mm. The second width is 3.35mm.

6. A spot welding device, characterized in that, have: Two electrode rods, each being an electrode rod as described in any one of claims 1 to 5; A fixture holds the two electrode rods so that the two electrode rods are positioned opposite each other at a distance in the second direction; as well as The power supply connects the positive and negative terminals to the two electrode rods respectively.

7. The spot welding device as described in claim 6, characterized in that, The distance between the two electrode rods in the second direction does not exceed twice the difference between the first width and the second width.

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