A shunt resistor

Abstract

The utility model provides a kind of shunt resistor, it includes: resistor body, insulating support, two electrodes and pin.The two electrodes are respectively arranged at the both ends of resistor body, and mounting through hole is set on each electrode;Pin is worn and is arranged mounting through hole, pin has starting end and tail end, starting end is exposed outside mounting through hole, tail end is welded together with mounting through hole, and tail end is equipped with a root gap near the edge of mounting through hole;Insulating support includes pad and multiple profiling buckles on pad and anti-deviation column.Pin is worn and is arranged mounting through hole, compared with blind hole, mounting through hole gives pin greater contact area, pin is not prone to deviation, and fixed connection is more reliable by welding, pin is not prone to fall off;Insulating support and resistor body and electrode keep close, provide support and place repair resistance when resistor body occurs deformation, profiling buckle and anti-deviation column cooperate and limit two electrodes, prevent external force from leading resistance to occur deformation in the process of fixed pin.

Description

Technical Field

[0001] This utility model relates to the field of electronic product technology, and in particular to a shunt resistor. Background Technology

[0002] A shunt resistor is a low-resistance precision resistor used to measure current. When connected to a circuit, it directs current towards itself. The actual voltage across the shunt resistor can be measured using a voltmeter, and the current value of the current in the circuit can be indirectly obtained using Ohm's law. It is commonly used in current detection, overload protection, electricity meters, and battery management systems for electric vehicles.

[0003] In existing shunt resistors, the pin 21 is fixed by riveting. Specifically, a blind hole 23 is made on the electrode 22. After the pin 21 is placed into the blind hole 23, the edge of the blind hole 23 is squeezed by a riveting machine to deform the pressure area and thus fix the pin 21 to the electrode 22. Because the resistor itself is thin and the depth of the blind hole 23 is small, the contact area between the blind hole 23 and the pin 21 is small. As a result, the structural strength of the pin 21 after riveting is small, and there is a problem that it is easy to fall off. Moreover, the compressed part on the electrode 22 is concave and forms irregular burrs. When grinding and deburring, it is easy to scratch the pin 21 itself and cause the pin 21 to fall off. On the other hand, the resistor is subjected to pressure during the riveting process, which can easily cause deformation and defects. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a shunt resistor that optimizes the pin fixing method, improves the connection strength between the pin and the resistor, reduces the phenomenon of detachment, and avoids the resistor from deforming and causing defects when fixing the pin.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A shunt resistor includes: a resistor element, an insulating support, two electrodes, and leads;

[0007] The two electrodes are respectively disposed at both ends of the resistor, and each electrode has a mounting through hole;

[0008] The pin passes through the mounting through hole, and the pin has a starting end and a tail end. The starting end is exposed outside the mounting through hole, and the tail end is welded to the mounting through hole. A root gap is provided at the edge of the mounting through hole.

[0009] The insulating support includes a pad and a plurality of conformal buckles and anti-deviation posts located on the pad. The electrodes and the resistors are both in contact with the pad. The conformal buckles are distributed on the edge of the pad and are used to fasten the edge of the electrodes. The anti-deviation posts are distributed in the interval between two electrodes and are positioned at the boundary between the electrodes and the resistors. The anti-deviation posts are used to prevent the two electrodes from moving closer together.

[0010] In one embodiment, the electrodes have chamfers, and the two electrodes have different shapes.

[0011] In one embodiment, the pin has a rectangular cross-section, and the diameter of the starting end is the same as the diameter of the tail end.

[0012] In one embodiment, the pin has a stepped cross-section, the diameter of the starting end is smaller than the diameter of the tail end, and the mounting through hole is a cylindrical countersunk hole.

[0013] In one embodiment, the pin has a trapezoidal cross-section, the diameter of the starting end is smaller than the diameter of the tail end, and the mounting through hole is a tapered countersunk hole.

[0014] In one embodiment, the pin includes a current pin and a voltage detection pin, the diameter of the current pin being larger than the diameter of the voltage detection pin, the current pin being used to connect to a circuit, and the voltage detection pin being used to connect to a meter to measure voltage.

[0015] In one embodiment, each electrode is provided with one current pin and multiple voltage detection pins.

[0016] In one embodiment, the thickness of the resistive element is less than the thickness of the electrode.

[0017] In one embodiment, the resistive element has a repair surface.

[0018] In one embodiment, the pad has a clearance hole, the diameter of which is larger than the diameter of the mounting through hole.

[0019] Compared with existing technologies, the above-mentioned shunt resistor has the following advantages:

[0020] 1. The pins are mounted through holes. Compared with blind holes, mounting through holes provide a larger contact area for the pins, making them less prone to displacement. Furthermore, the connection is more secure through soldering, and the pins are less likely to fall off.

[0021] 2. The weld slag formed during welding is convex, making it easy to grind, and the grinding process will not cause the pins to fall off;

[0022] 3. The insulating bracket keeps in close contact with the resistor and electrodes, providing support to prevent deformation of the resistor during repair. The conformal buckle and anti-deviation post work together to limit the two electrodes and prevent external force from causing deformation of the resistor during the fixing process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the fixed pin structure in an existing shunt resistor.

[0025] Figure 2 This is a schematic diagram of the shunt resistor structure;

[0026] Figure 3 for Figure 2 The diagram shows the breakdown of the shunt resistor.

[0027] Figure 4 This is a schematic diagram showing the fit between the pins and the mounting holes;

[0028] Figure 5 This is a schematic diagram showing the fit between the pin cross-section and the electrode.

[0029] Figure 6 This is a schematic diagram showing the fit between the pin cross-section and the electrode.

[0030] Figure 7 This is a schematic diagram showing the fit between the pin and the electrode when the pin cross-section is a sloping trapezoid.

[0031] Reference numerals: 10, Shunt resistor; 100, Resistor element; 200, Insulating support; 210, Pad; 211, Clearance hole; 220, Contour clip; 230, Anti-deviation post; 300, Electrode; 310, Mounting through hole; 311, Root gap; 320, Chamfer; 400, Pin; 41, Start end; 42, End end; 410, Current pin; 420, Voltage detection pin. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figure 2 and Figure 3 This utility model provides a shunt resistor 10, which includes: a resistor body 100, an insulating support 200, two electrodes 300 and pins 400.

[0036] Please see Figure 2 and Figure 3 Two electrodes 300 are respectively disposed at both ends of the resistor body 100, and the thickness of the resistor body 100 is less than the thickness of the electrode 300. Each electrode 300 has a mounting through hole 310; the mounting through hole 310 penetrates the electrode 300 to which it is located. The resistor body 100 has a resistance adjustment surface, and grooves are made on the resistance adjustment surface to adjust the resistance value of the shunt resistor 10. The resistance adjustment ensures the consistency of the resistance value of each shunt resistor 10 produced.

[0037] Please see Figure 3 and Figure 4 The pin 400 passes through the mounting through hole 310. The pin 400 has a starting end 41 and a tail end 42. The starting end 41 is exposed outside the mounting through hole 310, and the tail end 42 is welded to the mounting through hole 310. A root gap 311 is provided at the edge of the mounting through hole 310. The root gap 311 is the position for welding.

[0038] Please see Figure 2 and Figure 3The insulating support 200 includes a pad 210 and a plurality of contoured buckles 220 and anti-deviation posts 230 located on the pad 210. The electrode 300 and the resistor 100 are both in contact with the pad 210. The contoured buckles 220 are distributed on the edge of the pad 210 and are used to fasten the edge of the electrode 300. The anti-deviation posts 230 are distributed in the interval between the two electrodes 300 and are held at the boundary between the electrode 300 and the resistor 100. The anti-deviation posts 230 are used to place the two electrodes 300 close to each other.

[0039] When manufacturing the shunt resistor 20, electrodes 300 are fixed at both ends of the resistor body 100, with a gap between the two electrodes 300. Each electrode 300 has a mounting through hole 310, resulting in a semi-finished product. An insulating bracket 200 is placed on the semi-finished product, so that the pad 210 fits against the resistor body 100 and the electrode 300. The conformal buckle 220 hooks onto the outer wall of the electrode 300. After the insulating bracket 200 is fixed, the anti-deviation post 230 provides support at the boundary between the electrode 300 and the resistor body 100, preventing the semi-finished product from bending due to external forces generated during the subsequent installation of the pin 400, which could cause defects.

[0040] After fixing the insulating bracket 200, the pin 400 is passed through the mounting through hole 310 and welded at the root gap 311 to fix the pin 400 to the electrode 300. Then, the welded area is ground to make the resistor surface flat. Compared with the original riveting structure, this application does not require the riveting head to apply force to squeeze the electrode 300 when fixing the pin 400, avoiding the problem of external force damaging the semi-finished resistor; at the same time, welding can make the connection between the pin 400 and the electrode 300 more secure, ensuring that the pin 400 is not easy to fall off.

[0041] Furthermore, since the resistor 100 is thinner than the electrode 300, the external force generated during the fixing of the pin 400 and subsequent resistor repair process can easily cause the resistor 100 to break or deform. The conformal buckle 220 on the insulating bracket 200 cooperates with the anti-deviation post 230 to limit the electrode 300 and prevent it from shifting relative to the resistor 100. In addition, the pad 210 is in contact with the resistor 100 and provides support for the resistor 100 during the resistor repair process, so as to avoid damage to the resistor 100 during the processing and reduce the probability of defective products.

[0042] Please see Figure 2 In one embodiment, the electrode 300 is provided with a chamfer 320, and the two electrodes 300 have different shapes. The electrode 300 can be adjusted according to the setting environment of the shunt resistor 20.

[0043] Example 1,

[0044] Please see Figure 5The cross-section of pin 400 is rectangular, and the diameter of the starting end 41 is the same as the diameter of the tail end 42. It is suitable for scenarios where the diameter of pin 400 is large. Pin 400 can be inserted into the mounting through hole 310 from the front or back of electrode 300.

[0045] Example 2,

[0046] Please see Figure 6 The pin 400 has a stepped cross-section, with the diameter of the starting end 41 being smaller than the diameter of the tail end 42. The mounting through hole 310 is a cylindrical countersunk hole. The difference from Embodiment 1 is that the tail end 42 of the pin 400 forms a step with the starting end 41. This is suitable for scenarios where the pin 400 has a small diameter and is difficult for a robotic arm to grasp. The step formed by the size difference between the starting end 41 and the tail end 42 serves as a limit, allowing the pin 400 to be smoothly fixed within the mounting through hole 310.

[0047] Example 3,

[0048] Please see Figure 7 The pin 400 has a trapezoidal cross-section, with the diameter of the starting end 41 being smaller than the diameter of the tail end 42. The mounting through hole 310 is a tapered countersunk hole. The difference from Embodiment 2 is that there is a tapered guide surface between the starting end 41 and the tail end 42. After being inserted into the mounting through hole 310, the tapered guide surface and the tapered countersunk hole cooperate to guide the starting end 41 to the center position of the mounting through hole 310, making it suitable for scenarios requiring high positional accuracy of the pin 400.

[0049] In one embodiment, the pin 400 includes a current pin 410 and a voltage detection pin 420. The diameter of the current pin 410 is larger than the diameter of the voltage detection pin 420. The current pin 410 is used to connect to the circuit, and the voltage detection pin 420 is used to connect to a meter to measure voltage. Preferably, each electrode 300 is provided with one current pin 410 and multiple voltage detection pins 420. The current pin 410 and the voltage detection pin 420 are fixed to the electrode 300 in the same manner, and the electrode 300 has a mounting through hole 310 of a matching size.

[0050] Preferably, the pad 210 has a clearance hole 211, the diameter of which is larger than the diameter of the mounting through hole 310, so as to provide enough space for the installation of the pin 400.

[0051] Compared with the prior art, the above-mentioned shunt resistor 10 has the following advantages:

[0052] 1. The pin 400 passes through the mounting through hole 310. Compared with the blind hole, the mounting through hole 310 provides a larger contact area for the pin 400, making the pin 400 less prone to displacement. Moreover, the connection is more secure by soldering, and the pin 400 is less likely to fall off.

[0053] 2. The weld slag formed during welding is convex, making it easy to grind, and the grinding process will not cause the pin 400 to fall off;

[0054] 3. The insulating bracket 200 is in close contact with the resistor 100 and the electrode 300 to provide support for the resistor 100 to deform during the repair process. The conformal buckle 220 and the anti-deviation post 230 work together to limit the two electrodes 300 to prevent the resistor from deforming due to external force during the fixing of the pin 400.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A shunt resistor, characterized in that, include: Resistor, insulating support, two electrodes and pins; The two electrodes are respectively disposed at both ends of the resistor, and each electrode has a mounting through hole; The pin passes through the mounting through hole. The pin has a starting end and a tail end. The starting end is exposed outside the mounting through hole, and the tail end is wrapped by the mounting through hole. A root gap is provided at the edge of the mounting through hole. The insulating support includes a pad and a plurality of conformal buckles and anti-deviation posts located on the pad. The electrodes and the resistors are both in contact with the pad. The conformal buckles are distributed on the edge of the pad and are used to fasten the edge of the electrodes. The anti-deviation posts are distributed in the interval between two electrodes and are positioned at the boundary between the electrodes and the resistors. The anti-deviation posts are used to prevent the two electrodes from moving closer together.

2. The shunt resistor according to claim 1, characterized in that, The electrodes have chamfers, and the two electrodes have different shapes.

3. The shunt resistor according to claim 1, characterized in that, The pin has a rectangular cross-section, and the diameter of the starting end is the same as the diameter of the tail end.

4. The shunt resistor according to claim 1, characterized in that, The pin has a stepped cross-section, the diameter of the starting end is smaller than the diameter of the tail end, and the mounting through hole is a cylindrical countersunk hole.

5. The shunt resistor according to claim 1, characterized in that, The pin has a trapezoidal cross-section, the diameter of the starting end is smaller than the diameter of the tail end, and the mounting through hole is a tapered countersunk hole.

6. The shunt resistor according to claim 1, characterized in that, The pins include a current pin and a voltage detection pin. The diameter of the current pin is larger than the diameter of the voltage detection pin. The current pin is used to connect to the circuit, and the voltage detection pin is used to connect to a meter to measure the voltage.

7. The shunt resistor according to claim 6, characterized in that, Each electrode is provided with one current pin and multiple voltage detection pins.

8. The shunt resistor according to claim 1, characterized in that, The thickness of the resistive element is less than the thickness of the electrode.

9. The shunt resistor according to claim 1, characterized in that, The resistor has a resistance-repairing surface.

10. The shunt resistor according to claim 1, characterized in that, The pad has a clearance hole, the diameter of which is larger than the diameter of the mounting through hole.

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