Capacitor core welded copper band structure and capacitor having the same

Abstract

The utility model discloses copper band structure and capacitor with its of capacitor core welding, include: copper band, the recess of multiple groups along its extension direction is established in copper band both sides, connecting piece, the integral forming is located the recess position department on copper band and is located, the utility model welds when the spraying gold layer of capacitor core with connecting piece, and elastic arm has certain elastic deformation ability, when the slight displacement of core is produced because thermal expansion and cold shrinkage, vibration or assembly error, elastic arm can moderate bending or compression, and the mechanical stress produced thereby is absorbed, and stress concentration is avoided in the welding point department, simultaneously, and the connecting area of expansion portion increases connecting piece and copper band, and the local stress produced by welding is dispersed to greater area, and the stress load on unit area is reduced, and the welding point cracking is reduced, and it is also helpful to the uniform diffusion of welding heat, avoids the soldering material fragilization or core damage caused by partial overheating, and indirectly reduces the adverse effect of thermal stress on the welding point.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor technology, and particularly relates to a copper strip structure for welding capacitor cores and a capacitor having the same structure. Background Technology

[0002] During the manufacturing process, capacitors generally require electrodes, copper strips, or busbars to bring out the positive and negative terminals. For large-capacity capacitors, busbars or copper strips are typically used. This necessitates soldering the busbars or copper strips to the capacitor core.

[0003] Existing welding methods mainly involve directly welding the busbar or copper strip to the gold plating layer of the core. By directly welding the busbar to the gold plating surface of the core, these stresses will continue to act on the connection interface between the solder joint and the gold plating layer of the core during long-term operation of the capacitor. Over time, this can easily lead to problems such as gold plating layer peeling off and solder joint cracking. Therefore, a copper strip structure for welding the capacitor core and a capacitor with this structure are proposed to solve this problem. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution: This utility model provides a copper strip structure for welding capacitor cores, comprising: a copper strip, wherein multiple sets of grooves along its extension direction are formed on both sides of the copper strip; The connector, integrally formed on the copper strip and located in the groove, is used to connect with the capacitor core. The connector includes an enlarged part, two sets of elastic arms extending from both ends of the enlarged part, and a connecting part for connecting the two sets of elastic arms. The two sets of elastic arms together enclose an annular hole.

[0005] In one embodiment, the copper strip has multiple sets of through holes that mate with the core rod of the capacitor along its extension direction to achieve positioning.

[0006] In one embodiment, the outline shape of the annular hole is circular or elliptical.

[0007] In one embodiment, a capacitor includes a copper strip structure for welding the capacitor core as described in any of the preceding claims.

[0008] The beneficial effects of this utility model are as follows: When the connector is soldered to the gold-plated layer of the capacitor core, the elastic arm has a certain elastic deformation capacity. When the core undergoes slight displacement due to thermal expansion and contraction, vibration, or assembly errors, the elastic arm can bend or compress appropriately to absorb the resulting mechanical stress and avoid stress concentration at the solder joint. This significantly reduces the risk of solder joint cracking or fatigue failure. At the same time, the enlarged part increases the connection area between the connector and the copper strip, dispersing the local stress generated by welding to a larger area, reducing the stress load per unit area, reducing solder joint cracking, and also helping to uniformly diffuse the welding heat, avoiding local overheating that could lead to solder embrittlement or core damage, indirectly reducing the adverse effects of thermal stress on the solder joint. Attached Figure Description

[0009] Figure 1 The diagram shown is a schematic representation of the overall structure of this utility model. Figure 2 The present utility model shown Figure 1 Enlarged structural diagram at point A in the middle.

[0010] Reference numerals: 10, copper strip; 11, groove; 12, through hole; 20, connector; 21, elastic arm; 22, connecting part; 23, enlarged part; 24, annular hole. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0012] To meet the demand for large capacitor capacity, capacitors often employ a parallel structure of multiple cores connected and led out via busbars or copper strips. To improve the internal space utilization and energy density, capacitor cores of different sizes can be arranged. However, irregular core arrangement, inconsistent relative distances, and poor consistency in the position and size of solder joints result in high stress at the solder joints. Insulating rods are fitted at the winding axis of the capacitor cores.

[0013] Example 1 A copper strip structure for welding capacitor core, copper strip 10, wherein multiple sets of grooves 11 along its extension direction are formed on both sides of the copper strip 10. The connector 20 is integrally formed on the copper strip 10 and located at the groove 11 for connecting with the capacitor core. The connector 20 includes an enlarged portion 23, two sets of elastic arms 21 extending from both ends of the enlarged portion 23, and a connecting portion 22 for connecting the two sets of elastic arms 21. The two sets of elastic arms 21 together enclose an annular hole 24.

[0014] Specifically, the connector 20 structure can be used as a connection point with the gold plating layer of the core. When the connector 20 is welded or pressed with the gold plating layer of the capacitor core, the elastic arm 21 has a certain elastic deformation capability. When the core undergoes slight displacement due to thermal expansion and contraction, vibration or assembly errors, the elastic arm can bend or compress appropriately to absorb the mechanical stress generated therefrom, avoiding stress concentration at the solder joint, thereby significantly reducing the risk of solder joint cracking or fatigue failure. At the same time, the enlarged part 23 increases the connection area between the connector 20 and the copper strip 10, dispersing the local stress generated by welding to a larger area, reducing the stress load per unit area, reducing solder joint cracking, and also helping to uniformly diffuse the welding heat, avoiding local overheating that leads to solder embrittlement or core damage, indirectly reducing the adverse effects of thermal stress on the solder joint.

[0015] In one embodiment, the copper strip 10 has multiple sets of through holes 12 that mate with the capacitor core rod along its extension direction for positioning. The core function of these through holes 12 is to achieve precise positioning and mating between the copper strip and the capacitor core rod. During capacitor assembly, the insulating core rod at the winding axis of the capacitor core will pass into the through holes 12. Through the gap fit between the core rod and the through holes 12, the copper strip 10 is fixed in a preset position. Since the position of the core rod is fixed relative to the capacitor housing, the copper strip 10, through the mating with the core rod via the through holes 12, can indirectly achieve position calibration of each capacitor core during arrangement, avoiding subsequent welding deviations caused by irregular core arrangement and inconsistent relative distances, thus laying the foundation for precise docking of the subsequent connector 20 with the gold-plated layer of the core.

[0016] In one embodiment, the annular hole 24 has a circular or elliptical outline. The circular or elliptical outline has a continuous and smooth curvature without sharp corners or abrupt structures, which can effectively avoid stress concentration. During the welding process or when the capacitor is running, the small deformation caused by temperature changes, mechanical vibrations, etc. will be evenly distributed through the flexible boundary of the annular hole 24, preventing excessive local stress from causing the weld to crack. The annular hole 24 is formed by two sets of elastic arms 21. Its circular or elliptical outline allows the elastic arms 21 to deform evenly in a symmetrical direction when subjected to force (such as radial contraction or expansion), avoiding the transmission of torque or shear stress caused by asymmetrical bending to the weld.

[0017] Example 2 A capacitor includes the copper strip structure for welding the capacitor core described in Embodiment 1.

[0018] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A copper strip structure for welding capacitor cores, characterized in that, include: A copper strip (10) has multiple sets of grooves (11) on both sides along its extension direction. The connector (20) is integrally formed on the copper strip (10) and located at the groove (11) position for connecting with the capacitor core. The connector (20) includes an enlarged part (23), two sets of elastic arms (21) extending from both ends of the enlarged part (23), and a connecting part (22) for connecting the two sets of elastic arms (21). The two sets of elastic arms (21) together enclose an annular hole (24).

2. The copper strip structure for welding capacitor cores according to claim 1, characterized in that, The copper strip (10) has multiple sets of through holes (12) that cooperate with the core rod of the capacitor along its extension direction to achieve positioning.

3. The copper strip structure for welding capacitor cores according to claim 2, characterized in that, The outline shape of the annular hole (24) is circular or elliptical.

4. A capacitor, characterized in that, Includes the copper strip structure for capacitor core welding as described in any one of claims 1 to 3.

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