Automobile anti-vulcanization thick film chip resistor

Abstract

The utility model relates to the technical field of resistors, in particular to an anti-vulcanization thick-film chip resistor for an automobile. According to the technical scheme, a resistance layer is arranged on a substrate, positive electrodes are arranged on the two sides of the resistance layer, side electrodes wrap the outer sides of the positive electrodes, back electrodes are arranged on the two sides of the bottom end of the substrate, second clamping teeth are arranged on the back electrodes, clamping grooves are formed in the positive electrodes, first clamping teeth and limiting protruding blocks are arranged on the side electrodes, and the limiting protruding blocks are arranged on the first clamping teeth. The side electrode is clamped with the second clamping tooth and the clamping groove through the first clamping tooth and the limiting convex block respectively; the outer side of the side electrode is coated with a nickel-plated layer and a tin-plated layer, and the outer side of the resistive layer is coated with an inner protective layer and an outer protective layer. According to the utility model, through a unique clamping structure, the electrode connection stability is obviously enhanced, the contact resistance is reduced, and the current transmission stability is ensured. Due to the multi-layer protection design, vulcanization and water vapor erosion are effectively resisted, the service life of the resistor is prolonged, and powerful support is provided for reliable operation of an automobile electronic system.

Description

Technical Field

[0001] This utility model relates to the field of resistor technology, specifically to an automotive anti-sulfurization thick film wafer resistor. Background Technology

[0002] Thick film resistors are important components in electronic products and are widely used in thick film circuits. They are a common type of resistor, characterized by screen printing of resistive paste onto a ceramic substrate, followed by a sintering process to solidify and stabilize the resistive paste on the ceramic substrate.

[0003] A search revealed that patent application CN202420374104.8 discloses a thick-film resistor resistant to sulfidation and moisture. While this device enhances the resistor's resistance to sulfidation and moisture to some extent by incorporating multiple electrodes, anti-sulfidation layers, and protective layers, making it suitable for applications such as automotive electronics, the connection structure between the resistor and electrodes is relatively traditional. During vehicle operation, frequent vibrations and bumps can cause the connection to loosen, affecting the stability of current transmission. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an automotive anti-sulfurization thick film wafer resistor, which solves the problems mentioned in the background art.

[0005] The solution to the above-mentioned technical problems provided by this utility model is as follows:

[0006] A thick-film wafer resistor for automotive anti-sulfurization includes a substrate, a resistive layer on the substrate, positive electrodes on both sides of the resistive layer, and side electrodes covering the outside of the positive electrodes.

[0007] The substrate has back electrodes on both sides of its bottom end. The back electrodes have second locking teeth. The positive electrodes have locking slots. The side electrodes have first locking teeth and limiting protrusions. The side electrodes are engaged with the second locking teeth and locking slots respectively through the first locking teeth and limiting protrusions.

[0008] The outer side of the side electrode is covered with a nickel plating layer and a tin plating layer, and the outer side of the resistive layer is covered with an inner protective layer and an outer protective layer.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, after the positive electrode is engaged with the limiting protrusion through the slot, it is protected by the side electrode pressing.

[0011] The beneficial effects of adopting the above-mentioned further solutions are:

[0012] After the positive electrode is initially fixed by the locking protrusion, the pressure-covering protection of the side electrode forms a dual protection mechanism. On the one hand, the side electrode physically wraps around the positive electrode from the outside, preventing external dust, moisture, and other impurities from directly contacting the positive electrode, effectively reducing the risk of oxidation and corrosion, extending the service life of the positive electrode, and ensuring its long-term stable conductivity. On the other hand, the pressure-covering protection further enhances the connection stability between the positive electrode and the side electrode. Even if the vehicle encounters severe vibration or impact while driving, the positive electrode and the side electrode are not prone to loosening or displacement, ensuring the continuity and stability of current transmission, avoiding circuit failures caused by poor connections, and providing a solid guarantee for the stable operation of the vehicle's electrical system.

[0013] Furthermore, the inner protective layer is located between the outer protective layer and the resistive layer.

[0014] The beneficial effects of adopting the above-mentioned further solutions are:

[0015] The inner and outer protective layers form a dual-layer protection system. The inner protective layer, adjacent to the resistive layer, immediately isolates it from external factors that could affect it, such as minute moisture penetration and corrosive gas molecules, providing direct protection. Its material typically possesses excellent insulation and chemical corrosion resistance, preventing physical or chemical changes in the resistive layer due to external factors, maintaining stable resistance characteristics, and ensuring accurate and constant resistance values. This guarantees consistently accurate current regulation. The outer protective layer, acting as a second line of defense, withstands mechanical damage from impacts and friction from larger particles, as well as corrosion from harsher environments such as acid rain and dust. This further enhances the protection of the resistive layer, extends the overall lifespan of the resistor, and improves product reliability in complex automotive environments.

[0016] Furthermore, the nickel plating layer is located between the tin plating layer and the side electrode.

[0017] The beneficial effects of adopting the above-mentioned further solutions are:

[0018] The synergistic effect of the nickel and tin plating layers significantly enhances the protective performance of the side electrode. The nickel plating layer possesses excellent adhesion and corrosion resistance; applying nickel first strengthens the bond between the subsequent tin plating layer and the side electrode, making the tin plating layer less prone to peeling off. Simultaneously, nickel itself exhibits strong resistance to various chemicals, effectively preventing external corrosive substances from eroding the side electrode and slowing down its corrosion rate. The tin plating layer, on the other hand, offers excellent conductivity and solderability. Located on the outermost layer, the tin plating layer not only further reduces the contact resistance when connecting the side electrode to external circuitry, ensuring efficient current transmission, but also prevents oxidation of the side electrode to some extent. Furthermore, during soldering, the tin plating layer reduces soldering difficulty, improves soldering quality, and ensures the reliability of the connection between the side electrode and other circuit components, thereby enhancing the overall performance of the resistor in the automotive electrical system.

[0019] Furthermore, the side electrode increases the tightness of the connection and the contact area with the back electrode and the positive electrode through the first retaining tooth and the limiting protrusion.

[0020] The beneficial effects of adopting the above-mentioned further solutions are:

[0021] In terms of connection tightness, the interlocking of the locking teeth and corresponding structures, along with the precise embedding of the limiting protrusions, creates a mechanical locking structure between the side electrodes and the front and back electrodes, greatly enhancing the connection's strength. During vehicle operation, under complex conditions such as frequent vibrations and bumps, this tight connection effectively prevents relative displacement or loosening between the electrodes, ensuring a stable current transmission path. From the perspective of contact area, according to electrical principles, increasing the contact area significantly reduces contact resistance. The increased contact area between the side electrodes and the front and back electrodes allows for smoother current conduction between the electrodes, reducing energy loss and heat generation caused by contact resistance, improving current transmission efficiency, and thus enhancing the overall electrical performance of the resistor, ensuring the efficient and stable operation of the automotive electrical system.

[0022] This invention provides an anti-sulfurization thick-film wafer resistor for automobiles. It has the following beneficial effects:

[0023] The positive electrode, serving as the current input port, is designed with materials and structure to ensure excellent conductivity, enabling stable reception of external current. The side electrode is tightly connected to the positive and back electrodes via teeth and limiting protrusions, increasing the contact area, reducing contact resistance, ensuring efficient current transmission between electrodes, minimizing energy loss and heat generation due to contact resistance, and providing a stable and efficient current supply to the automotive electrical system.

[0024] As the core component, the resistive layer, based on its specific resistance characteristics, utilizes the collision between electrons and the atoms of the resistive material to generate a resistance effect, converting electrical energy into heat energy, precisely regulating the current magnitude, meeting the strict requirements of various electronic components in the automotive circuit for different current values, and ensuring the normal operation of the automotive electrical system.

[0025] The side electrode engages with the second tooth of the back electrode via a first locking tooth, and a limiting protrusion is embedded in the slot of the positive electrode. This unique structure greatly enhances the tightness of the connection between the side electrode and the positive and back electrodes. Even when the car is in motion and faces complex conditions such as vibration and bumps, the stability of current transmission can be guaranteed, avoiding current interruption due to loose connection and ensuring reliable operation of the resistor.

[0026] The inner and outer protective layers on the outside of the resistive layer effectively prevent external sulfides, moisture, and other substances from corroding the resistive layer, maintaining its stable performance and ensuring that the resistance value is not affected by the external environment. The nickel and tin plating layers on the outside of the side electrodes prevent the side electrodes from being oxidized or corroded, ensuring that they maintain good conductivity and connection stability during long-term use, extending the overall service life of the resistor, and improving the reliability of the product in complex environments. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0028] In the attached diagram:

[0029] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 2 This is a schematic diagram showing the appearance of the side electrode, positive electrode, and back electrode of this utility model after they are spliced ​​together.

[0031] Figure 3 This is a bottom view of the side electrode, positive electrode, and back electrode of this utility model in their spliced ​​state.

[0032] Figure 4 This is a front view schematic diagram of the side electrode, positive electrode, and back electrode of this utility model in their spliced ​​state.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Outer protective layer; 2. Tin plating layer; 3. Positive electrode; 301. Slot; 4. Nickel plating layer; 5. Side electrode; 501. First locking tooth; 502. Limiting bump; 6. Back electrode; 601. Second locking tooth; 7. Inner protective layer; 8. Resistive layer; 9. Substrate. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1 to 4 As shown, the embodiments provided by this utility model are as follows:

[0037] Example 1

[0038] A thick-film wafer resistor for automotive anti-sulfurization includes a substrate 9, a resistive layer 8 on the substrate 9, positive electrodes 3 on both sides of the resistive layer 8, side electrodes 5 covering the outside of the positive electrodes 3, and back electrodes 6 on both sides of the bottom end of the substrate 9. The back electrodes 6 have second locking teeth 601, the positive electrodes 3 have locking grooves 301, and the side electrodes 5 have first locking teeth 501 and limiting protrusions 502. The side electrodes 5 are engaged with the second locking teeth 601 and locking grooves 301 respectively through the first locking teeth 501 and limiting protrusions 502. The first locking teeth 501 and limiting protrusions 502 increase the tightness of the connection and the contact area between the side electrodes 5 and the back electrodes 6 and the positive electrodes 3. In terms of tightness of connection, the interlocking of the locking teeth with the corresponding structures and the precise embedding of the limiting protrusions 502 form a mechanical locking structure between the side electrodes 5 and the positive and back electrodes 6, which greatly enhances the firmness of the connection. When a car is subjected to frequent vibrations and bumps during operation, this tight connection effectively prevents relative displacement or loosening between the electrodes, ensuring a stable current transmission path. From the perspective of contact area, according to electrical principles, increasing the contact area significantly reduces contact resistance. The increased contact area between the side electrode 5 and the positive and back electrodes 6 makes current conduction between the electrodes smoother, reducing energy loss and heat generation caused by contact resistance, improving current transmission efficiency, and thus enhancing the overall electrical performance of the resistor. This ensures the efficient and stable operation of the automotive electrical system. After the positive electrode 3 is engaged with the limiting protrusion 502 via the slot 301, it is protected by the pressure of the side electrode 5. After the positive electrode 3 and the limiting protrusion 502 are initially fixed, the pressure protection of the side electrode 5 forms a dual protection mechanism. On the one hand, the side electrode 5 physically wraps the positive electrode 3 from the outside, preventing external dust, moisture, and other impurities from directly contacting the positive electrode 3, effectively reducing the risk of oxidation and corrosion, extending the service life of the positive electrode 3, and ensuring its long-term stable conductivity. On the other hand, the pressure protection further enhances the connection stability between the positive electrode 3 and the side electrode 5. Even if the car encounters severe vibration or impact while driving, the positive electrode 3 and the side electrode 5 are not prone to loosening or displacement, ensuring the continuity and stability of current transmission, avoiding circuit failures caused by poor connection, and providing a solid guarantee for the stable operation of the car's electrical system.

[0039] Example 2

[0040] To improve the overall performance of the resistor in the automotive circuit system, for example, such as Figures 1 to 4As shown, this utility model also includes: a nickel plating layer 4 and a tin plating layer 2 covering the outer side of the side electrode 5. The nickel plating layer 4 is located between the tin plating layer 2 and the side electrode 5. The nickel plating layer 4 and the tin plating layer 2 work together to greatly improve the protective performance of the side electrode 5. The nickel plating layer 4 has good adhesion and corrosion resistance. Plating nickel on the surface of the side electrode 5 first can enhance the bonding force between the subsequent tin plating layer 2 and the side electrode 5, making the tin plating layer 2 less likely to fall off. At the same time, nickel itself has a strong resistance to a variety of chemical substances, which can effectively block the corrosion of the side electrode 5 by external corrosive substances and slow down the corrosion rate of the side electrode 5. The tin plating layer 2 possesses excellent conductivity and solderability. Located on the outermost layer, the tin plating layer 2 not only further reduces the contact resistance when the side electrode 5 is connected to the external circuit, ensuring efficient current transmission, but also prevents the side electrode 5 from being oxidized to a certain extent. Furthermore, during the soldering process, the tin plating layer 2 reduces soldering difficulty, improves soldering quality, and ensures the reliability of the connection between the side electrode 5 and other circuit components, thereby enhancing the overall performance of the resistor in the automotive electrical system. The resistor layer 8 is covered by an inner protective layer 7 and an outer protective layer 1. The inner protective layer 7 is located between the outer protective layer 1 and the resistor layer 8, forming a double-layer protection system. The inner protective layer 7 is adjacent to the resistor layer 8, immediately isolating it from external factors that may affect it, such as minute moisture penetration and corrosive gas molecules, providing the most direct protection. Its material typically possesses good insulation and chemical corrosion resistance, preventing physical or chemical changes in the resistor layer 8 due to external factors, maintaining stable resistance characteristics, ensuring accurate and constant resistance values, and thus guaranteeing accurate current regulation. The outer protective layer 1 serves as the second line of defense, withstanding mechanical damage such as impacts and friction from larger external particles, as well as corrosion from harsher environments such as acid rain and sandstorms. This further enhances the protection of the resistor layer 8, extends the service life of the entire resistor, and improves the reliability of the product in complex automotive environments.

[0041] Working principle:

[0042] The current is first introduced into the positive electrode 3 from the external circuit. As the initial port for current input, the positive electrode 3 is designed with materials and structure to ensure good conductivity and stably receive external current.

[0043] Current is conducted from the positive electrode 3 to the resistive layer 8. The resistive layer 8 is the core of the entire resistor, using its specific resistive characteristics to impede the current flow, thereby regulating the current magnitude to meet the different current requirements of various electronic components in the automotive circuit. Its working principle is based on the physical properties of the resistive material. When current passes through the resistive layer 8, electrons collide with atoms in the resistive material, generating a resistance effect that converts electrical energy into heat energy, thus limiting the current magnitude.

[0044] The current, after being regulated by the resistive layer 8, is then conducted to the side electrode 5. The side electrode 5 is engaged with the second tooth 601 of the back electrode 6 via the first tooth 501, and the limiting protrusion 502 is embedded in the slot 301 of the positive electrode 3. This ingenious design is of great significance. From a principle perspective, based on the contact resistance theory in electricity, increasing the contact area can effectively reduce contact resistance. This engagement structure greatly increases the contact area between the side electrode 5 and the positive and back electrodes 6, making current conduction between the electrodes smoother, reducing energy loss and heat generation caused by contact resistance, and ensuring that the current can be efficiently conducted from the positive electrode 3 to the side electrode 5, and then stably transmitted to the back electrode 6. From an operational perspective, during vehicle operation, various vibrations, bumps, and other complex conditions occur. The tight engagement between the side electrode 5 and the positive and back electrodes 6 greatly enhances the connection tightness, ensuring that current transmission remains stable even in harsh environments and will not be interrupted due to loose connections. This provides a continuous and stable supply of the regulated current to the vehicle's electrical system, effectively guaranteeing the reliability of the entire resistor operation. The back electrode 6 serves as the current output terminal, delivering the regulated current to other parts of the automotive circuit to meet the normal operation requirements of the automotive electrical system.

[0045] Throughout the current transmission process, the inner protective layer 7 and outer protective layer 1 on the outside of the resistor layer 8, as well as the nickel plating layer 4 and tin plating layer 2 on the outside of the side electrode 5, continuously provide protection. The inner protective layer 7 and outer protective layer 1 prevent external sulfides, moisture, and other substances from corroding the resistor layer 8, maintaining the stability of the resistor layer 8 and ensuring that its resistance value is not affected by the external environment. The nickel plating layer 4 and tin plating layer 2 protect the side electrode 5 from oxidation or corrosion, ensuring that the side electrode 5 maintains good conductivity and connection stability during long-term use, thereby ensuring the reliable operation of the entire resistor.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A thick-film wafer resistor for automotive anti-sulfurization, comprising a substrate (9), wherein a resistive layer (8) is disposed on the substrate (9), positive electrodes (3) are disposed on both sides of the resistive layer (8), and side electrodes (5) are covered on the outside of the positive electrodes (3), characterized in that: The substrate (9) has back electrodes (6) on both sides of its bottom end. The back electrodes (6) have a second locking tooth (601). The positive electrode (3) has a locking groove (301). The side electrode (5) has a first locking tooth (501) and a limiting protrusion (502). The side electrode (5) is engaged with the second locking tooth (601) and the locking groove (301) respectively through the first locking tooth (501) and the limiting protrusion (502). The side electrode (5) is covered with a nickel plating layer (4) and a tin plating layer (2) on the outside, and the resistor layer (8) is covered with an inner protective layer (7) and an outer protective layer (1) on the outside.

2. The automotive anti-sulfurization thick film wafer resistor according to claim 1, characterized in that: After the positive electrode (3) is engaged with the limiting protrusion (502) through the slot (301), it is protected by the side electrode (5).

3. The automotive anti-sulfurization thick film wafer resistor according to claim 1, characterized in that: The inner protective layer (7) is located between the outer protective layer (1) and the resistive layer (8).

4. The automotive anti-sulfurization thick film wafer resistor according to claim 1, characterized in that: The nickel plating layer (4) is located between the tin plating layer (2) and the side electrode (5).

5. The automotive anti-sulfurization thick film wafer resistor according to claim 1, characterized in that: The side electrode (5) increases the tightness of the connection and the contact area with the back electrode (6) and the positive electrode (3) through the first retaining tooth (501) and the limiting protrusion (502).

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