Special-shaped welding strip for battery
By setting up multiple sets of longitudinally extending grooves at the bottom of the main body of the welding tape, the secondary gate part is trapped into the groove, which solves the problems of small contact area, insufficient tension and poor conductivity of the existing welding tape, and improves welding performance and optimizes electrical performance.
Patent Information
- Application Number
- CN202421939078.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-12
AI Technical Summary
When welding with the secondary gate, the existing round wire welded belt has a small contact area, insufficient tensile force, and poor conductivity, resulting in unsatisfactory welding performance and affecting electrical performance and equipment efficiency.
A special-shaped welding tape is designed, and a number of longitudinally extending grooves are provided on the bottom of the welding tape main body along the length direction, so that the secondary gate part is trapped in the groove and increases the contact area.
By increasing the contact area, the welding performance is improved, the mechanical combination and electrical performance of the welding points are enhanced, the solder joint resistance is reduced, and the efficiency and reliability of the equipment are improved.
Smart Images
Figure CN223024878U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of solar modules, and particularly relates to a special-shaped solder ribbon for a battery. Background Art
[0002] The existing solder ribbons are mostly round wire solder ribbons about 0.2 mm, which are mainly used for welding precision electronic devices such as solar panels. When this round wire solder ribbon is welded to the sub-grid (such as the silver grid line on a solar cell), due to the small contact area, the tensile force and contact conduction effect after welding are not ideal; the specific disadvantages are as follows: small contact area: the contact between the round wire solder ribbon and the sub-grid is only limited to the circumferential part of the solder ribbon, resulting in insufficient contact area and restricting the effective transmission of current; insufficient tensile force: the mechanical strength of the welding point is low, and the problem of solder joint fracture is likely to occur during use; poor conduction effect: due to the small contact area, the resistance of the solder joint is large, affecting the overall electrical performance and reducing the efficiency and reliability of the device; light reflection problem: the incident light of the conventional round wire solder ribbon will be reflected back by the solder ribbon, reducing the light energy utilization efficiency. Summary of the Invention
[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and provides a special-shaped solder ribbon for a battery. By forming grooves on one side of the round wire solder ribbon and using this side to contact the sub-grid, the sub-grid part is sunk into the grooves, thereby increasing the contact area and improving the welding performance. The specific technical solutions are as follows:
[0004] To achieve the above technical purposes, the technical solution adopted by the utility model is:
[0005] A special-shaped solder ribbon for a battery, which includes a solder ribbon main body. A plurality of groups of grooves are arranged along the length direction at the bottom of the solder ribbon main body. The grooves extend longitudinally in the circumferential direction of the solder ribbon main body, and the side surface of the solder ribbon main body is a flat cross-section.
[0006] Preferably, for the special-shaped solder ribbon for a battery, a plurality of groups of grooves are equidistantly arranged along the length direction at the bottom of the solder ribbon main body.
[0007] Preferably, for the special-shaped solder ribbon for a battery, the shape of the grooves is selected from one of semi-circular, V-shaped, and trapezoidal.
[0008] Preferably, for the special-shaped solder ribbon for a battery, the depth of the grooves < 12 μm and the width < 40 μm.
[0009] Preferably, for the special-shaped solder ribbon for a battery, the solder ribbon main body is welded to the battery cell, and a sub-grid is arranged on the surface of the battery cell, and the sub-grid is connected to the grooves.
[0010] The beneficial effects brought by the technical solution provided by the embodiment of the present utility model are as follows:
[0011] (1) For the special-shaped solder ribbon for batteries of the present utility model, by arranging multiple groups of grooves along the length direction at the bottom of the solder ribbon body, the contact area between the special-shaped solder ribbon and the sub-grid is increased, and the current transmission efficiency is improved; the grooves make the mechanical combination of the welding points more compact, increasing the tensile force and durability of the welding points. The increased contact area reduces the resistance of the welding points and improves the overall electrical performance, which helps to improve the equipment efficiency.
[0012] (2) For the special-shaped solder ribbon for batteries of the present utility model, the welding effect between the special-shaped solder ribbon and the battery chip is better, reducing rework and maintenance caused by welding point problems and lowering the overall manufacturing and maintenance costs.
[0013] (3) For the special-shaped solder ribbon for batteries of the present utility model, the side of the solder ribbon body has a flat cross-section. After cutting the side of the solder ribbon flat, part of the incident light will be reflected onto the battery chip, increasing the irradiance and improving the power generation. Description of the Drawings
[0014] Figure 1 It is a schematic structural diagram of the special-shaped solder ribbon for batteries of the present utility model.
[0015] Figure 2 It is a cross-sectional view of the special-shaped solder ribbon for batteries of the present utility model.
[0016] Figure 3 It is a cross-sectional view of the solder ribbon groove of the special-shaped solder ribbon for batteries of the present utility model.
[0017] Figure 4 It is a schematic diagram of the butt joint before welding between the special-shaped solder ribbon for batteries of the present utility model and the battery chip.
[0018] Figure 5 It is a schematic diagram after welding between the special-shaped solder ribbon for batteries of the present utility model and the battery chip. Detailed Embodiments
[0019] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "inside, outside", "above, below", "front, back", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the protection scope of the present utility model.
[0020] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0021] As Figure 1 , a special-shaped solder strip for a battery, which includes a solder strip main body 1. Along the length direction of the bottom of the solder strip main body 1, multiple groups of grooves 2 are provided. The grooves 2 extend longitudinally in the circumferential direction of the solder strip main body 1, and the side surface of the solder strip main body 1 is a flat cross-section 6.
[0022] Multiple groups of grooves 2 are equidistantly arranged along the length direction of the bottom of the solder strip main body 1; the shape of the grooves 2 is selected from one of a semicircle, a V shape, and a trapezoid; the depth of the grooves 2 < 12 μm, and the width < 40 μm; the solder strip main body 1 is welded to a battery cell 3, and auxiliary grids 4 are provided on the surface of the battery cell 3, and the auxiliary grids 4 are in contact with the grooves 2.
[0023] The side of the special-shaped solder strip with the grooves 2 is in contact with the auxiliary grids 4, and during the welding process, part of the auxiliary grids 4 sink into the grooves, forming a stable mechanical and electrical connection; the solder strip can use a highly conductive material, such as copper or tin-plated copper, to ensure the electrical performance and corrosion resistance after welding; the side surface of the solder strip is flattened, so that part of the incident light is reflected onto the battery cell, increasing the irradiance and improving the power generation.
[0024] As Figure 2 , for the incident light 5, a flat cross-section 6 is formed on the side surface of the solder strip, and more light is reflected onto the surface of the battery cell.
[0025] Figure 4 In
[0026] Figure 5 , the solder strip main body 1 is placed parallel to the surface of the battery cell 3. The battery cell 3 serves as a welding base, and the auxiliary grids 4 are located on the surface of the battery cell and are about to be in contact with the grooves of the solder strip.
[0027] Embodiment 1
[0028] On an existing 0.2 mm copper solder strip, semicircular grooves are formed longitudinally every 1 mm, with a depth of 10 μm and a width of 30 μm. This solder strip is used for the welding of the auxiliary grids of a 0BB battery. The test shows that the contact resistance is reduced by 20% and the welding tensile force is increased by 15%.
[0029] Embodiment 2
[0030] V-shaped grooves are formed longitudinally every 0.8 mm on the existing 0.25-mm tin-plated copper solder strip, with a depth of 8 μm and a width of 25 μm, and it is ensured that the tin plating layer at the groove position is intact without exposing the copper. This solder strip is used for the welding of the auxiliary grid of the 0BB battery, and the test shows that the contact resistance is reduced by 25% and the welding tensile force is increased by 20%.
[0031] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present utility model rather than to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.
Claims
1. A special-shaped welding strip for a battery, characterized in that: It comprises a welding strip body (1), wherein a plurality of groups of grooves (2) are arranged at the bottom of the welding strip body (1) along the length direction, the grooves (2) extend longitudinally in the circumferential direction of the welding strip body (1), and the side surface of the welding strip body (1) is a flat cross section (6).
2. The special-shaped welding strip for battery according to claim 1, characterized in that: A plurality of groups of grooves (2) are arranged at equal intervals on the bottom of the welding strip body (1) along the length direction.
3. The special-shaped welding strip for battery according to claim 1, characterized in that: The shape of the groove (2) is selected from one of a semicircular shape, a V shape, and a trapezoidal shape.
4. The special-shaped welding strip for battery according to claim 1, characterized in that: The groove (2) has a depth of less than 12 μm and a width of less than 40 μm.
5. The special-shaped welding strip for battery according to claim 1, characterized in that: The welding strip body (1) and the battery cell (3) are welded, a secondary grid (4) is arranged on the surface of the battery cell (3), and the secondary grid (4) is connected to the groove (2).