Stamping fuse convenient to weld

Abstract

The utility model provides a stamping fuse convenient for welding, both sides of a fuse body are provided with PI films, the fuse body is connected with the PI films through hot pressing glue, one end of the fuse body is a soldering tin end, the other end of the fuse body is a fusing end, the soldering tin end is provided with a plurality of rows of welding holes at intervals, each row of welding holes comprises a first welding hole and a second welding hole, first welding holes are formed in the head and the tail of each row, at least one second welding hole is formed between every two adjacent first welding holes, the extending parts are arranged at the two ends of each second welding hole, the extending parts play a role in increasing the welding area, the contact area is large and not prone to deviation during laser welding, solder paste can be diffused between the second welding holes and the extending parts, welding is uniform, and the welding quality is improved. The welding strength is improved and the pseudo soldering probability is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fuse production, and more specifically, to a stamping fuse convenient for welding. Background Art

[0002] As an essential component of a battery pack, battery modules are widely used in the new energy industry. Among them, a battery module is composed of thousands of battery cells connected in series by conductive sheets. At the same time, it is necessary to make large-current connections to the positive and negative electrodes of each battery cell to provide the power required for the vehicle to run. At the same time, it is also necessary to monitor the voltage, current, and temperature of each battery cell and perform balance control adjustment when the electrical energy of the battery cells is unbalanced. The sampling wire harness for relevant signals is usually a flat wire.

[0003] The closest prior art is Application No.: 2024207375159, an anti-backflow mechanism for a flat wire, which discloses a flat wire main body 1 and a lead wire main body 5. The flat wire main body 1 includes insulating layers on the upper and lower sides and a flat conductor sandwiched between the two insulating layers. The lead wire main body 5 includes a fuse structure 51 and first connectors 52 and second connectors 55 at both ends of the fuse structure 51. The flat conductors are multiple, and exposed windows 2 are provided at different positions on at least one of the insulating layers corresponding to different flat conductors for exposing the flat conductors. The first connector 52 is connected to the flat conductor in the flat wire main body 1 through the exposed window 2, and the second connector 55 is used to connect external components. A backflow prevention hole 11 is provided corresponding to the body of the flat conductor connected by each first connector 52. The backflow prevention hole 11 is close to the current output end of the flat conductor and is a through-hole structure, so that when the current reaches the position of the backflow prevention hole 11 through the flat conductor, it does not flow through and can only flow to the first connector 52 corresponding to the backflow prevention hole 11.

[0004] For the fuse provided on the existing flat wire, the welding hole of the fuse is a round hole, and there are the following defects:

[0005] (1) The contact area is small, the structural strength of the welding between the fuse and the wire harness is poor, and the welding effect is not good.

[0006] (2) When the welding laser passes through the round hole, there is an offset, and virtual welding is likely to occur, and the welding effect is not good.

[0007] In view of this, the utility model proposes a stamping fuse with good welding effect, simple structure, and convenient for welding. Utility Model Content

[0008] The purpose of the utility model is to propose a stamping fuse with good welding effect, simple structure, and convenient for welding.

[0009] A stamping fuse convenient for welding, comprising a fuse body 1 and a PI film 2. PI films 2 are provided on both sides of the fuse body 1. The fuse body 1 and the PI films 2 are connected by a hot pressing adhesive. One end of the fuse body 1 is a soldering end 3, and the other end of the fuse body 1 is a fusing end 4. It is characterized in that: multiple rows of welding holes are arranged at intervals on the soldering end 3. Each row of welding holes includes a first welding hole 5 and a second welding hole 6. The first welding holes 5 are provided at both the head and the tail of each row. At least one second welding hole 6 is provided between adjacent first welding holes 5. Extension parts 7 are provided at both ends of the second welding hole 6, and the extension parts 7 play a role in increasing the welding area.

[0010] In some embodiments, the length of the extension part 7 is greater than 80% of the diameter of the second welding hole 6.

[0011] In some embodiments, the width of the extension part 7 is less than or equal to the diameter of the second welding hole 6.

[0012] In some embodiments, the diameter of the second welding hole 6 is less than or equal to the diameter of the first welding hole 5.

[0013] In some embodiments, the first welding hole 5 is a round hole.

[0014] In some embodiments, the gap between the first welding hole 5 and the second welding hole 6 ≥ 0.2 mm.

[0015] In some embodiments, the horizontal centerlines of the first welding hole 5 and the second welding hole 6 are on the same straight line. At the same time, the first welding hole 5 is symmetrically arranged longitudinally with respect to the second welding hole 6.

[0016] In some embodiments, the middle part of the fuse body 1 is a connecting part 8. The soldering end 3 and the fusing end 4 are connected through the connecting part 8. The connecting part 8 is S-shaped, increasing the resistance of the fuse body 1. Due to the increased resistance, the fuse body 1 is more likely to fuse when passing through a constant current.

[0017] Furthermore, openings 9 are also provided on the PI film 2 near the connecting part 8, the soldering end 3, and the fusing end 4. The openings 9 are formed along the outer edges of the connecting part 8, the soldering end 3, and the fusing end 4. When the soldering end 3 or the fusing end 4 is stressed, the bilateral stress is effectively decomposed, making the connecting part 8 not easily break.

[0018] In some embodiments, the fuse body 1 is rolled copper.

[0019] Advantages of the present utility model: The present utility model provides a stamping fuse that is convenient for welding. PI films 2 are provided on both sides of the fuse body 1. The fuse body 1 and the PI films 2 are connected by hot melt adhesive. One end of the fuse body 1 is a soldering end 3, and the other end is a fusing end 4. Multiple rows of welding holes are provided at intervals on the soldering end 3. Each row of welding holes includes a first welding hole 5 and a second welding hole 6. The first welding hole 5 is provided at both the head and the tail of each row. At least one second welding hole 6 is provided between adjacent first welding holes 5. Extension parts 7 are provided at both ends of the second welding hole 6. The extension parts 7 play a role in increasing the welding area. During laser welding, the contact area is large and it is not easy to shift. Moreover, the solder paste can spread between the second welding hole 6 and the extension parts 7 for uniform welding, improving the welding strength and reducing the probability of false soldering. Description of the Drawings

[0020] Figure 1 FIG. is a schematic diagram of the overall structure of a stamping fuse that is convenient for welding according to the present application.

[0021] Figure 2 FIG. is a schematic diagram of the structure of the fuse body of a stamping fuse that is convenient for welding according to the present application.

[0022] Figure 3 Table of data for the tensile strength test of the stamping fuse that is convenient for welding after welding in Example 1.

[0023] Figure 4 Table of data for the range of the maximum and minimum tensile strengths of the stamping fuse that is convenient for welding after welding in Example 1.

[0024] Figure 5 Table of data for the tensile strength test of the original stamping fuse after welding.

[0025] Figure 6 Table of data for the range of the maximum and minimum tensile strengths of the original stamping fuse after welding.

[0026] Description of the Main Component Symbols

[0027] Fuse body 1, PI film 2, Soldering end 3, Fusing end 4, First welding hole 5, Second welding hole 6, Extension part 7, Connection part 8, Opening 9.

[0028] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Specific Embodiments

[0029] The following embodiments are described to assist in understanding the present application. The embodiments are not and should not be construed in any way as limiting the scope of protection of the present application.

[0030] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or integrated together (including being integrated within a single system or component).

[0031] At the same time, the connections between components or systems are not intended to be limited to direct connections. Instead, the data between these components may be modified, reformatted, or otherwise changed by intermediate components. Additionally, additional or fewer connections may be used. It should also be noted that the terms "coupled", "connected", or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections.

[0032] Embodiment 1:

[0033] As Figure 1 shown, it is a schematic diagram of the overall structure of a stamping fuse facilitating welding according to the present application; as Figure 2 shown, it is a schematic diagram of the structure of the fuse body of a stamping fuse facilitating welding according to the present application.

[0034] A stamping fuse facilitating welding includes a fuse body 1 and a PI film 2. PI films 2 are provided on both sides of the fuse body 1. The fuse body 1 and the PI films 2 are connected by a hot melt adhesive. One end of the fuse body 1 is a soldering end 3, and the other end of the fuse body 1 is a fusing end 4. It is characterized in that: multiple rows of welding holes are provided at intervals on the soldering end 3. Each row of welding holes includes a first welding hole 5 and a second welding hole 6. The first welding holes 5 are provided at both the head and the tail of each row. At least one second welding hole 6 is provided between adjacent first welding holes 5. Extension parts 7 are provided at both ends of the second welding hole 6, and the extension parts 7 play a role in increasing the welding area.

[0035] The length of the extension part 7 is greater than 80% of the diameter of the second welding hole 6.

[0036] The width of the extension part 7 is less than or equal to the diameter of the second welding hole 6.

[0037] The diameter of the second welding hole 6 is less than or equal to the diameter of the first welding hole 5.

[0038] The first welding hole 5 is a round hole.

[0039] The gap between the first welding hole 5 and the second welding hole 6 ≥ 0.2 mm.

[0040] The horizontal center lines of the first welding hole 5 and the second welding hole 6 are on the same straight line. At the same time, the first welding hole 5 is symmetrically arranged longitudinally with respect to the second welding hole 6.

[0041] The middle part of the fuse body 1 is the connecting part 8. The soldering end 3 and the fusing end 4 are connected through the connecting part 8. The connecting part 8 is S-shaped, which increases the resistance of the fuse body 1. Due to the increased resistance, the fuse body 1 passes a constant current and is more likely to melt.

[0042] Openings 9 are also provided on the PI film 2 near the connecting part 8, the soldering end 3, and the fusing end 4. The openings 9 are formed along the outer edges of the connecting part 8, the soldering end 3, and the fusing end 4. When the soldering end 3 or the fusing end 4 is stressed, the bilateral stress is effectively decomposed, making the connecting part 8 not easily break.

[0043] The fuse body 1 is rolled copper.

[0044] The following are the data obtained by testing the present application and the original fuse in the same way and the comparison:

[0045] Testing method of the present application: Solder paste is set in the first solder hole 5 and the second solder hole 6, and the fuse body 1 and the connecting piece are welded by an automatic welding machine to obtain a test piece. Among them, extension parts 7 are provided at both ends of the second solder hole 6. 90 test pieces produced on the same day are sampled and divided into 18 groups, with 5 samples in each group. The horizontal tensile force of the two copper terminals of the fuse body 1 is tested. The detailed data are shown in Table 1. Figure 3 .

[0046] Table 1: Test results of the testing method of the present application

[0047]

[0048] The above Table 1 and Figure 3 It can be seen that: The standard tensile force is 1.5 kgf. The maximum value of the horizontal tensile force of the two copper terminals of the tested fuse body 1 is 4.94 Kgf, the minimum value is 2.46 Kgf, and the average value is 3.93 Kgf. The horizontal tensile force data are all greater than the standard tensile force of 1.5 kgf.

[0049] Original testing method: Solder paste is set in the first solder hole 5 and the second solder hole 6, and the fuse body and the connecting piece are welded by an automatic welding machine to obtain a test piece. Among them, both the first solder hole 5 and the second solder hole 6 are circular solder holes, and there are no extension parts 7 at both ends of the second solder hole 6. 90 test pieces produced on the same day are sampled and divided into 18 groups, with 5 samples in each group. The horizontal tensile force of the two copper terminals of the fuse body is tested. The horizontal tensile force of the two copper terminals of the fuse body 1 is tested. The detailed data are shown in Table 2. Figure 5 .

[0050] Table 2: Test results of the original testing method

[0051]

[0052] The above Table 2 and Figure 5It can be known that: the maximum value of the horizontal tensile force of the two copper terminals of the test fuse body 1 is 4.19 Kgf, the minimum value is 1.92 Kgf, and the average value is 2.91 Kgf.

[0053] As Figure 3 , Figure 4 shown, the average actual tensile force of the existing stamping fuses that are easy to weld after welding is 3.93 Kgf, which is much greater than the standard tensile force of 1.5 kgf, and the discrete degree of the tensile force extreme difference is small.

[0054] As Figure 5 , Figure 6 shown, for the tensile force of the original stamping fuse after welding, the average actual tensile force is 2.91 Kgf. The average tensile force is less than that of the existing stamping fuse, and the discrete degree of the tensile force extreme difference is slightly larger.

[0055] Summary: From the results in Table 1, the maximum value is 4.94 Kgf, the minimum value is 2.46 Kgf, and the average value is 3.93 Kgf. From the results in Table 2, the maximum value is 4.19 Kgf, the minimum value is 1.92 Kgf, and the average value is 2.91 Kgf. Therefore, extension parts 7 are provided at both ends of the second solder hole 6. By increasing the welding area, the solder paste can spread between the second solder hole 6 and the extension parts 7 for uniform welding, so that the welding strength is increased from 2.91 Kgf to 3.93 Kgf. At the same time, Figures 3-6 it can be seen that the addition of the extension parts 7 in this application makes the discrete degree smaller, thus reducing the probability of false soldering.

[0056] Although this application has disclosed multiple aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. The multiple aspects and embodiments disclosed in this application are only for illustrative purposes and are not intended to limit this application. The actual protection scope of this application is subject to the claims.

Claims

1. A stamped fuse that is easy to weld, comprising a fuse body (1) and a PI film (2), wherein the PI film (2) is provided on both sides of the fuse body (1), the fuse body (1) and the PI film (2) are connected by hot pressing adhesive, one end of the fuse body (1) is a solder end (3), and the other end of the fuse body (1) is a fuse end (4), characterized in that: The solder end (3) is provided with a plurality of rows of welding holes at intervals, each row of welding holes comprising a first welding hole (5) and a second welding hole (6), the first welding hole (5) is provided at the head and the tail of each row, at least one second welding hole (6) is provided between adjacent first welding holes (5), and extension portions (7) are provided at both ends of the second welding hole (6).

2. The punched fuse for easy welding as claimed in claim 1, characterized in that: The length of the extension portion (7) is greater than 80% of the diameter of the second welding hole (6).

3. The punched fuse for easy welding as claimed in claim 1, characterized in that: The width of the extension portion (7) is less than or equal to the diameter of the second welding hole (6).

4. The punched fuse for easy welding as claimed in claim 1, characterized in that: The diameter of the second welding hole (6) is smaller than or equal to the diameter of the first welding hole (5).

5. The punched fuse for easy welding as claimed in claim 1, characterized in that: The first welding hole (5) is a round hole.

6. The punched fuse for easy welding as claimed in claim 1, characterized in that: The gap between the first welding hole (5) and the second welding hole (6) is greater than or equal to 0.2 mm.

7. The punched fuse for easy welding as claimed in claim 1, characterized in that: The transverse center lines of the first welding hole (5) and the second welding hole (6) are in the same straight line, and the first welding hole (5) is symmetrically arranged with respect to the second welding hole (6) in the longitudinal direction.

8. The punched fuse for easy welding as claimed in claim 1, characterized in that: The middle part of the fuse body (1) is a connecting part (8), the solder end (3) and the fuse end (4) are connected via the connecting part (8), and the connecting part (8) is S-shaped.

9. The punched fuse for easy welding as claimed in claim 8, characterized in that: The PI film (2) is also provided with openings (9) near the connection part (8) and the solder end (3) and the fuse end (4), and the openings (9) are formed along the outer edges of the connection part (8) and the solder end (3) and the fuse end (4).

10. The punched fuse for easy welding as claimed in claim 1, characterized in that: The fuse body (1) is made of rolled copper.

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