Welding-free crimping terminal and power module

Abstract

The utility model discloses a welding-free crimping terminal and a power module, and relates to the technical field of welding-free crimping, the welding-free crimping terminal comprises a pin, a fisheye part and a root part which are connected in sequence, a first connecting cross beam and a second connecting cross beam which have an elastic self-recovery function are arranged between arc-shaped elastic members at two sides of the fisheye part, and the first connecting cross beam and the second connecting cross beam are connected with the root part. The first connecting cross beam and the second connecting cross beam are arc-shaped, and the concave side of the first connecting cross beam is opposite to the concave side of the second connecting cross beam; according to the utility model, the fisheye part extrudes the first connecting cross beam and the second connecting cross beam in the process of contacting with the PCB through hole for deformation, the first connecting cross beam and the second connecting cross beam generate deformation towards the protruding sides of the first connecting cross beam and the second connecting cross beam, and certain supporting force is given to the arc-shaped elastic pieces on the two sides; the crimping strength of the arc-shaped elastic piece is effectively improved, plastic deformation of the fisheye part can be avoided, and the reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of solderless crimping technology, and in particular to a solderless crimping terminal and power module. Background Technology

[0002] The connection between modules requires a connection structure. The commonly used connection structures are directly soldered pins or soldered fisheye terminals. A fisheye terminal is formed by setting two arc-shaped elastic elements on the pin to form a fisheye-like structure.

[0003] Directly soldered pins have problems such as high contact resistance and solder contamination;

[0004] During the deformation process of the welded fisheye terminal in contact with the PCB through hole, there may be insufficient holding force, resulting in insufficient lateral contact. Moreover, the stress is mostly concentrated in the middle of the fisheye, which may lead to plastic deformation and failure.

[0005] Therefore, there is an urgent need for a solderless crimp terminal with high crimping strength and high reliability. Utility Model Content

[0006] The purpose of this invention is to provide a weld-free crimp terminal and power module to solve the problems existing in the prior art. By using the first and second connecting beams, deformable support is provided for the arc-shaped elastic elements on both sides of the fisheye portion, which can effectively improve the crimping strength of the fisheye portion and avoid plastic deformation of the fisheye portion, thereby improving reliability.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a solderless crimp terminal, comprising a pin, a fisheye portion, and a root portion connected in sequence. A first connecting beam and a second connecting beam, both having elastic self-recovery function, are provided between the two arc-shaped elastic members on both sides of the fisheye portion. The first connecting beam and the second connecting beam are both arc-shaped, and the concave side of the first connecting beam is arranged opposite to the concave side of the second connecting beam.

[0008] Preferably, the root portion includes a connector and a buffer, the end of the fisheye portion away from the pin is connected to the connector, and the end of the connector away from the fisheye portion is provided with at least one curved buffer.

[0009] Preferably, the buffer is S-shaped.

[0010] Preferably, the end of the connector away from the fisheye portion is provided with two buffer members. Both the connector and the buffer members are plate-shaped. The buffer members are perpendicular to the connector. The ends of the two buffer members away from the connector are connected by a base plate.

[0011] Preferably, the base plate has a slot for the solder to climb.

[0012] Preferably, the connector is provided with a limiting beam for limiting the closing position of the cover plate of the module.

[0013] Preferably, the limiting beam and the connecting member are integrally formed.

[0014] Preferably, the outer wall of the connector is provided with multiple arc-shaped grooves.

[0015] Preferably, the two side walls of the connector are provided with a plurality of arc-shaped grooves.

[0016] This utility model also provides a power module using the above-mentioned solderless crimp terminal, including a substrate, a housing, a top cover plate, and a DBC substrate. The housing is disposed on the substrate, and the top cover plate is fastened to an opening at the end of the housing away from the substrate. The top cover plate has a plurality of through holes for the pins and the fisheye portion to extend out. The DBC substrate is located inside the housing, and the root is soldered to the DBC substrate.

[0017] The present invention achieves the following main technical effects compared to the prior art:

[0018] During the deformation process of the fisheye section in contact with the PCB through-hole, the arc-shaped elastic elements on both sides of the fisheye section deform and move in opposite directions. During the opposite movement of the arc-shaped elastic elements on both sides, they will compress the first connecting beam and the second connecting beam. The first connecting beam and the second connecting beam will deform towards their own convex side and provide a certain support force to the arc-shaped elastic elements on both sides. Due to the deformable characteristics of the connecting beam, this support force is actually a flexible support force, which not only avoids damage to the arc-shaped elastic elements on both sides, but also effectively helps to improve the pressing strength of the arc-shaped elastic elements, and can also prevent plastic deformation of the fisheye section, thereby improving reliability.

[0019] The other solutions of this utility model achieve the following technical effects compared to the prior art:

[0020] The buffer design allows the fisheye section to absorb the pressure generated along the insertion direction during the insertion process based on its own curve design, thereby achieving the purpose of buffering and preventing plastic deformation of the overall structure.

[0021] Setting up two buffers can improve the cushioning effect, while the design of the base plate can improve the welding strength with the DBC substrate.

[0022] The slots on the base plate allow the solder to climb, further improving the welding strength.

[0023] The limiting beam can limit the position of the upper cover plate when the module's upper cover plate is fastened, ensuring assembly accuracy.

[0024] The arc-shaped groove on the connector can also help to alleviate the pressure generated along the insertion direction during the insertion process, further preventing plastic deformation of the overall structure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view of the solderless crimp terminal in an embodiment of this utility model;

[0027] Figure 2 This is a left view of the solderless crimp terminal in an embodiment of this utility model;

[0028] Figure 3 This is a top view of the power module in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 Sectional view at point BB;

[0030] The components are as follows: 1. Pin; 2. Fisheye part; 3. Root; 4. Arc-shaped elastic element; 5. First connecting crossbeam; 6. Second connecting crossbeam; 7. Connector; 8. Buffer; 9. Base plate; 10. Slot; 11. Limiting crossbeam; 12. Arc-shaped slot; 13. Power module; 14. Base plate; 15. Outer shell; 16. Top cover plate; 17. DBC base plate; 18. Support rod. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] The purpose of this invention is to provide a weld-free crimp terminal and power module to solve the problems existing in the prior art. By using the first and second connecting beams, deformable support is provided for the arc-shaped elastic elements on both sides of the fisheye part, which can effectively improve the crimping strength of the fisheye part and avoid plastic deformation of the fisheye part, thereby improving reliability.

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to the following: Figures 1-4 As shown, a solderless crimp terminal is provided, including a pin 1, a fisheye portion 2, and a root portion 3 connected in sequence. The fisheye portion 2 includes two arc-shaped elastic members 4 with opposite concave sides. The two ends of the two arc-shaped elastic members 4 are respectively connected to the pin 1 and the root portion 3. A first connecting beam 5 and a second connecting beam 6 are provided between the two arc-shaped elastic members 4 on both sides of the fisheye portion 2. Both the first connecting beam 5 and the second connecting beam 6 are arc-shaped, and the concave side of the first connecting beam 5 is opposite to the concave side of the second connecting beam 6.

[0035] The pin 1, the fish-eye part 2, and the root part 3 are made of phosphor bronze, copper-nickel-silicon, beryllium copper, brass, etc. The first connecting beam 5 and the second connecting beam 6 can be made of the same material as the fish-eye part 2, and the first connecting beam 5 and the second connecting beam 6 can be integrated with the arc-shaped elastic parts 4 on both sides to improve the structural strength.

[0036] Pin 1, fisheye part 2, and root part 3 can be integrated to improve structural strength.

[0037] The flexible support, consisting of the first connecting beam 5 and the second connecting beam 6, is positioned in the middle of the fisheye part 2 where plastic deformation is likely to occur, thus ensuring the service life of the fisheye part 2.

[0038] The working principle of the solderless crimp terminal in this embodiment is as follows: During the deformation process of the fisheye portion 2 in contact with the PCB through hole, the arc-shaped elastic elements 4 on both sides of the fisheye portion 2 deform and move in opposite directions. During the opposite movement of the arc-shaped elastic elements 4 on both sides, they will squeeze the first connecting beam 5 and the second connecting beam 6. The first connecting beam 5 and the second connecting beam 6 will deform towards their own protruding side and provide a certain supporting force to the arc-shaped elastic elements 4 on both sides. Due to the deformable characteristics of the connecting beam, this supporting force is actually a flexible supporting force, which not only avoids damage to the arc-shaped elastic elements 4 on both sides, but also effectively helps to improve the crimping strength of the arc-shaped elastic elements 4, and can also avoid plastic deformation of the fisheye portion 2, thereby improving reliability.

[0039] The root 3 includes a connector 7 and a buffer 8. The end of the fisheye portion 2 away from the pin 1 is connected to the connector 7. The end of the connector 7 away from the fisheye portion 2 is provided with at least one curved buffer 8. The end of the buffer 8 away from the connector 7 is used to solder to the copper layer of the DBC substrate 17. The buffer 8 is provided so that the fisheye portion 2 can absorb the pressure generated along the insertion direction during the insertion process according to its own curve design, thereby achieving the purpose of buffering and preventing plastic deformation of the overall structure.

[0040] The buffer 8 can be configured in an S-shape, U-shape, or wave-shaped form, designed to deform in the bending direction when under pressure, so as to absorb pressure and achieve the purpose of buffering.

[0041] In this embodiment, two buffers 8 are provided at the end of the connector 7 away from the fisheye portion 2 to improve the buffering effect. Both the connector 7 and the buffers 8 are plate-shaped, and the buffers 8 are perpendicular to the connector 7. The ends of the two buffers 8 away from the connector 7 are connected by a base plate 9. The design of the base plate 9 can increase the welding area to improve the welding strength with the DBC substrate 17. The curved protrusions of the buffers 8 on both sides are arranged in opposite directions to avoid the overall structure tilting when the buffers 8 on both sides are deformed under pressure.

[0042] A support rod 18 is provided at the middle of the end of the connector 7 away from the fisheye part 2. In the initial state, the support rod 18 The end furthest from the connector 7 is spaced apart from the base plate 9; the support rod 18 is designed to prevent the buffer 8 from being damaged. Plastic deformation caused by excessive deformation The support rod 18 is designed to abut against the base plate 9 after the buffer 8 bends to a certain extent, preventing the buffer 8 from continuing to deform. .

[0043] A slot 10 can be provided on the base plate 9. The number of slots 10 is not limited; there can be one or more. The slots 10 allow the solder to climb, further improving the welding strength.

[0044] The connector 7 is provided with a limiting beam 11 for limiting the closing position of the module's cover plate. After the actual installation of the weld-free crimp terminal, the limiting beam 11 can limit the position of the upper cover plate 16 when the module's upper cover plate 16 is fastened, ensuring assembly accuracy.

[0045] The limiting beam 11 is integrated with the connector 7 to improve structural strength and reduce the chance of breakage when limiting the upper cover plate 16.

[0046] Multiple arc-shaped grooves 12 are provided on the outer wall of the connector 7. The arc-shaped grooves 12 penetrate the entire outer wall surface. The arc-shaped grooves 12 are designed to provide a certain deformation space when the structure is under pressure. They can also relieve the pressure generated along the insertion direction during the insertion process and further prevent the overall structure from undergoing plastic deformation.

[0047] In this embodiment, multiple arc-shaped grooves 12 are provided on both sides of the connector 7. The corresponding design can prevent the overall structure from tilting when subjected to pressure deformation.

[0048] This utility model also provides a power module 13 using the above-mentioned solderless crimp terminals, including a substrate 14, a housing 15, a top cover 16, and a DBC substrate 17. The housing 15 is disposed on the substrate 14, and the top cover 16 is fastened to the opening at the end of the housing 15 away from the substrate 14. The top cover 16 has a plurality of through holes for the protrusion of the pins 1 and the fisheye portion 2. The DBC substrate 17 is located inside the housing 15, and the root 3 is welded to the DBC substrate 17. The end face of the top cover 16 near the substrate 14 contacts the limiting beam 11 to achieve limiting. The fisheye portion 2 extends out from the through holes. The number of solderless crimp terminals can be selected as needed.

[0049] During the actual crimping process, as the fisheye part 2 is inserted into the PCB through hole, the arc-shaped elastic elements 4 on both sides of the fisheye part 2 contact the PCB through hole and deform, and squeeze the first connecting beam 5 and the second connecting beam 6. The first connecting beam 5 and the second connecting beam 6 will deform towards their own protruding side, and provide a certain support force to the arc-shaped elastic elements 4 on both sides. After the fisheye part 2 is inserted into place, the crimping work is completed.

[0050] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0051] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A solderless crimp terminal, characterized in that, It includes a pin, a fisheye part and a root part connected in sequence. A first connecting beam and a second connecting beam with elastic self-recovery function are provided between the two arc-shaped elastic members on both sides of the fisheye part. The first connecting beam and the second connecting beam are both arc-shaped, and the concave side of the first connecting beam is arranged opposite to the concave side of the second connecting beam.

2. The solderless crimp terminal according to claim 1, characterized in that, The root includes a connector and a buffer. The end of the fisheye portion away from the pin is connected to the connector, and the end of the connector away from the fisheye portion is provided with at least one curved buffer.

3. The solderless crimp terminal according to claim 2, characterized in that, The buffer is S-shaped.

4. The solderless crimp terminal according to claim 2, characterized in that, Two buffer members are provided at the end of the connector away from the fisheye portion. Both the connector and the buffer members are plate-shaped. The buffer members are perpendicular to the connector. The ends of the two buffer members away from the connector are connected by a base plate.

5. The solderless crimp terminal according to claim 4, characterized in that, The base plate has slots for the solder to climb up.

6. The solderless crimp terminal according to claim 2, characterized in that, The connector is provided with a limiting beam for restricting the closing position of the module's cover plate.

7. The solderless crimp terminal according to claim 6, characterized in that, The limiting beam and the connecting piece are integrally formed.

8. The solderless crimp terminal according to claim 2, characterized in that, The outer wall of the connector is provided with multiple arc-shaped grooves.

9. The solderless crimp terminal according to claim 8, characterized in that, The connector has multiple arc-shaped grooves on both sides of its side walls.

10. A power module, characterized in that, The solderless crimp terminal as described in any one of claims 1-9 includes a substrate, a housing, a top cover, and a DBC substrate. The housing is disposed on the substrate, and the top cover is fastened to an opening at the end of the housing away from the substrate. The top cover has a plurality of through holes for the pins and the fisheye portion to extend out. The DBC substrate is located inside the housing, and the root portion is soldered to the DBC substrate.

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