Resistor with electrodes at two ends of long side

Abstract

The utility model relates to the technical field of resistors, and discloses a resistor with electrodes at two ends of a long side. The adhesive layer is arranged on the upper surface of the substrate; the alloy layer is arranged on the upper surface of the adhesive layer; the copper electrode is arranged on the upper surface of the alloy layer and extends along the long side direction of the resistor; and a protective layer. According to the resistor with the electrodes at the two ends of the long side, compared with the short-side electrodes, the welding contact surface of the PCB is increased by the long-side electrodes, so that the heat dissipation is increased, the power is improved, and the heat dissipation performance of products with the same size and the same resistance value is better; the four-terminal resistor can be converted into a 4-T design structure, subsequent low-sampling-precision I C is facilitated, meanwhile, the product thickness can be designed to be lower than 0.35 mm, a fast-charging mobile phone lithium battery is protected, meanwhile, the requirement that the four-terminal resistor can be converted into the 4-T design structure is met, and high-precision measurement is achieved through independent current end and voltage end design. The core advantage is that the interference of the lead resistance and the contact resistance on the measurement result is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, specifically a resistor with electrodes at both ends of its long side. Background Technology

[0002] With the trend towards miniaturization and high power in electronic products, the demand for fast charging technology and high-precision current sampling of lithium batteries has placed higher requirements on resistive components. Traditional plastic-encapsulated sampling resistors suffer from problems such as low heat dissipation efficiency, large thickness, and insufficient accuracy, making it difficult to meet the needs of large-capacity battery protection and high-speed circuits.

[0003] Existing short-side electrode resistors have a small PCB soldering contact area, resulting in limited heat dissipation capacity and an inability to be flexibly converted into a four-terminal (4-T) structure. It is also difficult to eliminate the influence of lead resistance and contact resistance on measurement accuracy. Therefore, we propose a resistor with electrodes at both ends of the long side to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a resistor for the electrodes at both ends of the long side, thus solving the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a resistor with electrodes at both ends of its long side, comprising:

[0006] substrate;

[0007] An adhesive layer is disposed on the upper surface of the substrate;

[0008] An alloy layer is disposed on the upper surface of the adhesive layer;

[0009] A copper electrode is disposed on the upper surface of the alloy layer and extends along the long side of the resistor.

[0010] A protective layer covers the non-conductive areas of the alloy layer and part of the copper electrode.

[0011] Furthermore, the copper electrode includes a first elongated electrode and a second elongated electrode. The first elongated electrode and the second elongated electrode are located on the two sides of the upper surface of the alloy layer, and their lengths are consistent with the long side of the resistor. The protective layer covers the middle area between the first elongated electrode and the second elongated electrode, and the edge of the protective layer is spaced apart from the edges of the first elongated electrode and the second elongated electrode.

[0012] Furthermore, the copper electrode includes four block-shaped terminal electrodes located on the upper surface of the alloy layer, and a cross-shaped conductive bridge connecting the four block-shaped terminal electrodes; the protective layer covers the area other than the four block-shaped terminal electrodes and the cross-shaped conductive bridge, and an insulating gap is formed between the protective layer and the outer edges of the four block-shaped terminal electrodes.

[0013] Furthermore, the substrate is made of ceramic or glass fiber with a thickness of ≤0.35mm, the width of the first and second elongated electrodes is 0.3-1.5mm, the adhesive layer is an insulating adhesive layer used to fix the alloy layer, and the alloy layer is a low-resistivity alloy material with a thickness of 5-20 μm.

[0014] Furthermore, the width of the cross-shaped conductive bridge is 0.2-1.0 mm.

[0015] Furthermore, the low-resistivity alloy material is a manganese-copper alloy.

[0016] The beneficial effects of this utility model are:

[0017] 1. The resistance of the electrodes at both ends of the long side increases the PCB soldering contact surface compared to the short side electrodes, thereby increasing heat dissipation and improving power. Products of the same size and resistance value have better heat dissipation. It can be converted into a 4-T design structure, which is beneficial for subsequent ICs with low sampling accuracy. At the same time, the product thickness can be designed as low as less than 0.35mm, protecting the lithium battery of fast-charging mobile phones. It can also be converted into a 4-T design structure. A four-terminal resistor is an electronic component that achieves high-precision measurement through the design of independent current terminals and voltage terminals. Its core advantage lies in eliminating the interference of lead resistance and contact resistance on the measurement results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 is a schematic diagram of the structure of this utility model;

[0020] Figure 2 is a schematic diagram of the long electrode resistor structure at both ends in Embodiment 1 of this utility model;

[0021] Figure 3 is a schematic diagram of the four-terminal long electrode resistor structure of Embodiment 2 of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Substrate; 2. Adhesive layer; 3. Alloy layer; 4. Copper electrode; 41. Long strip electrode one; 42. Long strip electrode two; 43. Four block-shaped terminal electrodes; 44. Cross-shaped conductive bridge; 5. Protective layer. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example

[0024] Referring to Figures 1 and 2, the copper electrode 4 consists of two elongated electrodes, 41 and 42, extending along the long side of the resistor. These two elongated electrodes are collectively referred to as elongated electrodes and are respectively disposed on the two sides of the upper surface of the alloy layer 3. The length of the elongated electrodes 41 and 42 is the same as the length of the long side of the resistor, and the width is 0.3-1.5mm to increase the PCB soldering contact surface. The protective layer 5 covers the middle area of ​​the alloy layer 3 and the non-soldering area of ​​the elongated electrodes 41 and 42, exposing only the ends of the elongated electrodes 41 and 42 as soldering ends.

[0025] The substrate 1 is made of ceramic or glass fiber with a thickness of ≤0.35mm. The adhesive layer 2 is an insulating adhesive layer used to fix the alloy layer 3. The alloy layer 3 is a low-resistivity alloy material, which is a manganese-copper alloy with a thickness of 5-20 μm, and is formed by semiconductor etching process.

[0026] In this embodiment, the long-side electrode design increases the PCB soldering contact area by 30%-50% compared to the traditional short-side electrode, improves heat dissipation efficiency by more than 20%, and allows the resistance thickness to be controlled below 0.35mm, making it suitable for ultra-thin high-power scenarios. Example

[0027] Referring to Figures 1 and 3, the copper electrode 4 includes four block-shaped terminal electrodes 43, which form a four-terminal long electrode resistor (4-T structure). These four block-shaped terminal electrodes 43 are respectively disposed at the four corners of the alloy layer 3, and each terminal electrode is electrically connected to the alloy layer 3 through a cross-shaped conductive bridge 44 extending along the long side. The four terminal electrodes 43 are divided into two groups: a current input terminal and a voltage sampling terminal. The width of the cross-shaped conductive bridge 44 is 0.2-1.0 mm, and its length covers the long side of the alloy layer 3. The protective layer 5 covers the central area of ​​the alloy layer 3 and the non-conductive area of ​​the cross-shaped conductive bridge 44, exposing only the welding surface of the terminal electrodes.

[0028] The materials and processes of substrate 1, adhesive layer 1 and alloy layer 2 are the same as in Example 1. The terminal electrodes are formed by copper plating and are plated with a nickel or tin protective layer to improve welding reliability.

[0029] In this embodiment, the four-terminal structure independently separates the current path and voltage sampling path, eliminating the influence of lead resistance and contact resistance, thereby improving the sampling accuracy to within 0.1%, which is suitable for high-precision current detection scenarios, while also being compatible with the high heat dissipation characteristics of the long-side electrode.

[0030] The copper electrode is implemented in two ways: a long strip electrode at both ends (Example 1) and a block electrode with four terminals (Example 2). The long side electrode design increases the PCB soldering contact area and improves heat dissipation efficiency, and the thickness can be less than 0.35mm. The four-terminal structure enables high-precision current sampling, which is suitable for scenarios such as mobile phone lithium battery protection and 5G equipment, and solves the problems of insufficient heat dissipation and low accuracy of existing resistors.

[0031] Process flow:

[0032] The resistor is prepared by the following steps:

[0033] Step 1: Stamp the substrate to form a predetermined shape;

[0034] Step 2: Drill holes and apply an adhesive layer to the substrate surface, then attach the alloy foil;

[0035] Step 3: Form the alloy layer pattern and electrode connection structure through photolithography and etching processes;

[0036] Step 4: Apply a protective layer (such as epoxy resin) to cover non-conductive areas;

[0037] Step 5: Perform copper plating and surface treatment on the copper electrodes;

[0038] Step Six: Resistance Repair, Printing, Scribing, Barrel Plating, Testing and Packaging.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A resistor with electrodes at both ends of its long side, characterized in that, include: substrate(1); An adhesive layer (2) is disposed on the upper surface of the substrate (1); An alloy layer (3) is disposed on the upper surface of the adhesive layer (2); A copper electrode (4) is disposed on the upper surface of the alloy layer (3) and extends along the long side of the resistor; A protective layer (5) covers the non-conductive area of ​​the alloy layer (3) and part of the copper electrode (4).

2. The resistor with electrodes at both ends of its long side according to claim 1, characterized in that: The copper electrode (4) includes a first elongated electrode (41) and a second elongated electrode (42). The first elongated electrode (41) and the second elongated electrode (42) are located on the two sides of the upper surface of the alloy layer (3), and their lengths are consistent with the long side of the resistor. The protective layer (5) covers the middle area between the first elongated electrode (41) and the second elongated electrode (42), and the edge of the protective layer (5) is spaced apart from the edges of the first elongated electrode (41) and the second elongated electrode (42).

3. The resistor with electrodes at both ends of its long side according to claim 1, characterized in that: The copper electrode (4) includes four block terminal electrodes (43) located on the upper surface of the alloy layer (3) and a cross-shaped conductive bridge (44) connecting the four block terminal electrodes (43); the protective layer (5) covers the area other than the four block terminal electrodes (43) and the cross-shaped conductive bridge (44), and an insulating gap is formed between the protective layer (5) and the outer edge of the four block terminal electrodes (43).

4. The resistor with electrodes at both ends of its long side according to claim 2, characterized in that: The substrate (1) is made of ceramic or glass fiber material with a thickness of ≤0.35mm. The width of the first long strip electrode (41) and the second long strip electrode (42) is 0.3-1.5mm. The adhesive layer (2) is an insulating adhesive layer used to fix the alloy layer (3). The alloy layer (3) is a low-resistance alloy material with a thickness of 5-20 μm.

5. A resistor with electrodes at both ends of its long side according to claim 3, characterized in that: The width of the cross-shaped conductive bridge (44) is 0.2-1.0 mm.

6. A resistor with electrodes at both ends of its long side according to claim 4, characterized in that: The low-resistivity alloy material is a manganese-copper alloy.

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