Electrochemical oxygen sensor based on anode lead integrated tin layer

Abstract

The utility model discloses an electrochemical oxygen sensor based on an anode lead integrated tin layer. The utility model provides an electrochemical oxygen sensor. The electrochemical oxygen sensor comprises a lower shell, an upper shell and pins, the upper shell comprises an air inlet hole, a cathode plate and a first pair of electrode nickel strap conductive wires; the lower shell comprises a diaphragm, an anode lead block, a second pair of electrode nickel strap conductive wires, a porous nickel net current collector and a tin melting layer; and alkaline electrolyte is injected into the lower shell. According to the utility model, the porous nickel net current collector, the second pair of electrode nickel strap conductive wires and the anode lead block are completely fixed through the integrated tin layer, so that the contact points are not influenced under severe use conditions, the output signal is stable and rapid, and the stable performance of the sensor is ensured. Moreover, the tin melting layer with weaker metallicity than lead is formed in the gap in the center of the bottom of the anode lead block, so that the anode lead block can fully react from inside to outside and from top to bottom, and the service life of the electrochemical oxygen sensor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical oxygen sensors, and more specifically, to an electrochemical oxygen sensor based on an integrally formed stannum layer on an anode lead. Background Art

[0002] ‌An electrochemical oxygen sensor‌ is an instrument used to measure the oxygen content in the environment and works based on the electrochemical principle. This sensor detects the oxygen level by measuring the electrical signal generated by the chemical reaction inside the sensor, and its output signal is proportional to the oxygen concentration. The main applications of electrochemical oxygen sensors include measuring the oxygen content in ambient air and monitoring the oxygen level in specific devices and systems, such as ventilators, respiratory sensors, and blood glucose monitoring devices.

[0003] In the prior art, on the one hand, the electrochemical oxygen sensor is a two-electrode primary battery type (Galinstan battery type) lead-oxygen sensor. Generally, the inner cavity of this lead-oxygen sensor is filled with an alkaline electrolyte solution, and the inner cavity also contains a cathode diaphragm prepared from a noble metal catalyst, an anode lead formed by pressing lead wires, a liquid-retaining insulating diaphragm, a conductive wire, etc. Oxygen undergoes a reduction reaction at the cathode to generate hydroxide ions: O2 + 2H2O + 4e- → 4OH-, and the anode lead wire is oxidized into red-brown lead dioxide Pb + 4OH- → PbO2 + 2H2O + 4e-. When the anode lead wire is completely oxidized, the service life of the lead-oxygen sensor ends. However, problems such as the chemical reaction of the alkaline electrolyte on the surface of the anode lead to form a dense lead oxide film, which prevents the further electrochemical oxidation reaction of the lead wire, and the formation of non-conductive lead oxide on the outer surface of the anode lead restricts the further reaction in the middle and bottom of the cylindrical anode lead will reduce the theoretical service life of the lead-oxygen sensor. On the other hand, as an important type of gas sensor, the electrochemical oxygen sensor is widely used in industrial gas detection, medical and health, environmental emissions and other fields. During use, working conditions such as vibrations and violent shakes that inevitably occur will affect the stability of the contact between components, thereby affecting its performance parameters. Patent CN101339157B discloses an electrochemical gas sensor, which compresses the inside of the electrochemical oxygen sensor to a fully compressed state before assembly, and then seals the sensor upper cover and the sensor housing by ultrasonic welding to ensure that all components are in full contact after encapsulation. However, it ignores that the anode lead block, as an important component of the electrochemical oxygen sensor, is a dynamic process of continuous consumption and volume change during its use. Although it is in full contact at the initial stage of encapsulation, it cannot ensure that all components are always in stable contact during the use of the sensor. Summary of the Utility Model

[0004] In view of this, the present utility model provides an electrochemical oxygen sensor based on an integrally formed tin layer on anode lead, which can ensure that the anode lead can fully react and maintain a stable contact during use, thereby ensuring the service life and performance of the electrochemical oxygen sensor.

[0005] The present utility model provides an electrochemical oxygen sensor based on an integrally formed tin layer on anode lead, comprising: a lower housing, an upper housing disposed on the top of the lower housing, and pins connected to the bottom of the lower housing;

[0006] The upper housing includes an air inlet hole, a cathode sheet, and a first pair of electrode nickel strip conductive wires;

[0007] The air inlet hole is opened at the top of the upper housing, the cathode sheet is disposed at the bottom of the upper housing and is in contact with the air inlet hole; the cathode sheet is connected to one of the pins through the first pair of electrode nickel strip conductive wires;

[0008] The lower housing includes a diaphragm, an anode lead block, a second pair of electrode nickel strip conductive wires, a porous nickel mesh current collector, and a tin layer;

[0009] The diaphragm is disposed at the bottom of the cathode sheet, and the anode lead block is disposed at the bottom of the diaphragm;

[0010] The bottom of the anode lead block has a void, one end of the second pair of electrode nickel strip conductive wires extends into the void, and the other end is connected to another one of the pins;

[0011] The porous nickel mesh current collector wraps the bottom of the anode lead block and one end of the second pair of electrode nickel strip conductive wires extending into the void;

[0012] The tin layer is filled in the void of the anode lead block;

[0013] An alkaline electrolyte is injected into the lower housing.

[0014] In a possible implementation, the anode lead block includes lead wires, which are wound and pressed in a cylindrical shape in layers;

[0015] The void is located at the center of the bottom of the anode lead block.

[0016] In a possible implementation, the diameter of the void is 5 mm and the depth is 4 mm.

[0017] In a possible implementation, the materials of the first pair of electrode nickel strip conductive wires, the second pair of electrode nickel strip conductive wires, and the porous nickel mesh current collector are all nickel.

[0018] In a possible implementation, the tin layer is formed by melting a solder sheet.

[0019] In a possible implementation, the anode lead block, the porous nickel mesh current collector, and the stannic layer are integrated.

[0020] In a possible implementation, the pins include two and are connected to the bottom of the lower housing.

[0021] In a possible implementation, the first pair of electrode nickel strip conductive wires are connected to the bottom of the cathode sheet, extend along the inner wall of the housing to the bottom of the housing, and are connected to one of the pins.

[0022] Compared with the prior art, the electrochemical oxygen sensor based on the anode lead integrated stannic layer provided by the present utility model has at least achieved the following beneficial effects:

[0023] In the embodiment provided by the present utility model, by completely fixing the porous nickel mesh current collector, the second pair of electrode nickel strip conductive wires, and the anode lead block through the integrated stannic layer, the electrochemical oxygen sensor is not affected by its contact points under harsh usage conditions, the output signal is stable and rapid, ensuring the stable performance of the sensor. Moreover, since a stannic layer with a lower metallicity than lead is formed in the gap at the center of the bottom of the anode lead block, it is easier to react with the alkaline electrolyte, enabling the anode lead block to react fully from the inside out and from top to bottom, thus ensuring the service life of the electrochemical oxygen sensor.

[0024] Of course, it is not necessarily required for any product implementing the present utility model to achieve all the above-mentioned technical effects simultaneously.

[0025] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present utility model and, together with the description, are used to explain the principles of the present utility model.

[0027] Figure 1 FIG. is a schematic structural diagram of an electrochemical oxygen sensor based on an anode lead integrated stannic layer provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present utility model, its applications, or uses.

[0030] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0031] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0032] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0033] An embodiment of the present utility model provides an electrochemical oxygen sensor based on an integrated tin layer of anode lead. Referring to Figure 1 As shown, an embodiment of the present utility model provides an electrochemical oxygen sensor based on an integrated tin layer of anode lead, including a lower housing 20, an upper housing 10 disposed on the top of the lower housing 20, and pins 30 connected to the bottom of the lower housing 20.

[0034] Further, there are 2 pins 30, which are connected to the bottom of the lower housing 20.

[0035] The upper housing 10 includes an air inlet hole 11, a cathode sheet 12, and a first pair of electrode nickel strip conductive wires 13.

[0036] The air inlet hole 11 is opened at the top of the upper housing 10, and the size of the air inlet hole 11 is in the micron range. The cathode sheet 12 is disposed at the bottom of the upper housing 10 and is in contact with the air inlet hole 11. The cathode sheet 12 is fixed to the bottom of the upper housing 10 by hot pressing. The cathode sheet 12 is connected to one pin 30 through the first pair of electrode nickel strip conductive wires 13. Specifically, the first pair of electrode nickel strip conductive wires 13 are connected to the bottom of the cathode sheet 12, extend along the inner wall of the lower housing 20 to the bottom of the lower housing 20, and are connected to one pin 30. The first pair of electrode nickel strip conductive wires 13 are made of high-purity metal nickel.

[0037] The lower housing 20 includes a diaphragm 21, an anode lead block 22, a second pair of electrode nickel strip conductive wires 23, a porous nickel mesh current collector 24, and a tin layer 25.

[0038] The diaphragm 21 is disposed at the bottom of the cathode sheet 12, and the anode lead block 22 is disposed at the bottom of the diaphragm 21.

[0039] The bottom of the anode lead block 22 has a void. Specifically, the anode lead block 22 includes lead wires, which are wound and pressed in a cylindrical layer to form the anode lead block 22. The purity of the lead wires used is above 99.99%. The void is located at the center of the bottom of the anode lead block 22. The diameter of the void is 5 mm and the depth is 4 mm. One end of the second pair of electrode nickel strip conductive wires 23 extends into the void, and the other end is connected to another pin 30. The porous nickel mesh current collector 24 wraps the bottom of the anode lead block 22 and one end of the second pair of electrode nickel strip conductive wires 23 extending into the void; it should be noted that the materials of the second pair of electrode nickel strip conductive wires 23 and the porous nickel mesh current collector 24 are both nickel. The tin oxide layer 25 is filled in the void of the anode lead block 22.

[0040] It should be noted that the tin oxide layer 25 is formed by filling a crescent-shaped solder sheet into a groove, adding a combustion aid and then melting at high temperature. The molten solder sheet forms the tin oxide layer 25 in the groove and forms an integral body with the anode lead block 22 and the porous nickel mesh current collector 24. Further, the soldering flux is one or more of citric acid, sodium citrate, potassium citrate, lactic acid, and rosin acid. The selected soldering flux is easy to solder and clean. By adopting the above technical solution, the anode lead integrated tin oxide layer is completely fixed, and the contact sites will not move under harsh operating conditions such as vibration and shaking during the use of the electrochemical oxygen sensor. The electrons generated after the electrochemical oxidation reaction of the anode lead can be quickly transmitted, making the output current signal of the electrochemical oxygen sensor more stable and rapid.

[0041] Further, an alkaline electrolyte is injected into the lower housing 20.

[0042] The working principle of the electrochemical oxygen sensor provided by the present invention is as follows:

[0043] The oxygen to be measured enters the inside of the sensor from the air inlet hole 11 and reaches the cathode plate 12, where a reduction reaction occurs: O2 + 2H2O + 4e- → 4OH-. The generated hydroxide ions are transmitted through the alkaline electrolyte from the closely contacting diaphragm 21 to the anode lead block 22, where an oxidation reaction occurs: Pb + 4OH- → PbO2 + 2H2O + 4e-. The anode lead block 22, the second pair of electrode nickel strip conductive wires 23, and the porous nickel mesh current collector 24 use a crescent-shaped solder sheet to form an integrated tin oxide layer 25 after adding a soldering flux and melting at high temperature. Finally, the generated current signal is transmitted through the pin 30 to an external instrument, where it is collected and processed to obtain the oxygen concentration in the detection environment.

[0044] It can be understood that the metallicity of the tin oxide layer 25 is weaker than that of lead and it is easier to react with the alkaline electrolyte. Therefore, the anode lead can react fully from the inside out and from top to bottom, ensuring that the normal service life of the electrochemical oxygen sensor can reach more than 95% of the designed theoretical life (generally 2 years).

[0045] In summary, the electrochemical oxygen sensor based on the integrated tin layer of anode lead provided by the present utility model at least achieves the following beneficial effects:

[0046] In the embodiment provided by the present utility model, by completely fixing the porous nickel mesh current collector, the second pair of electrode nickel strip conductive wires and the anode lead block through the integrated tin layer, the electrochemical oxygen sensor is not affected by its contact points under harsh usage conditions, and the output signal is stable and rapid, ensuring the stable performance of the sensor. Moreover, since a tin layer with a weaker metallic property than lead is formed in the void at the center of the bottom of the anode lead block, it is easier to react with the alkaline electrolyte, so that the anode lead block can react fully from the inside to the outside and from top to bottom, thus ensuring the service life of the electrochemical oxygen sensor.

[0047] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. An electrochemical oxygen sensor based on an integrated tin layer of anode lead, characterized in that, Comprising: A lower housing, an upper housing disposed on top of the lower housing, and pins connected to the bottom of the lower housing; The upper housing includes an air inlet hole, a cathode plate, and a first pair of electrode nickel strip conductive wires; The air inlet hole is opened at the top of the upper housing, the cathode plate is disposed at the bottom of the upper housing and is in contact with the air inlet hole; the cathode plate is connected to one of the pins through the first pair of electrode nickel strip conductive wires; The lower housing includes a separator, an anode lead block, a second pair of electrode nickel strip conductive wires, a porous nickel mesh current collector, and a tin layer; The separator is disposed at the bottom of the cathode plate, and the anode lead block is disposed at the bottom of the separator; The bottom of the anode lead block has a gap, one end of the second pair of electrode nickel strip conductive wires extends into the gap, and the other end is connected to the other pin; The porous nickel mesh current collector wraps the bottom of the anode lead block and one end of the second pair of electrode nickel strip conductive wires extending into the gap; The tin layer fills the gap of the anode lead block; An alkaline electrolyte is injected into the lower housing.

2. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 1, characterized in that, The anode lead block includes lead wires, and the lead wires are wound and pressed in a cylindrical shape; The gap is located at the center of the bottom of the anode lead block.

3. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 2, characterized in that, The diameter of the gap is 5 mm and the depth is 4 mm.

4. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 1, wherein, The materials of the first pair of electrode nickel strip conductive wires, the second pair of electrode nickel strip conductive wires, and the porous nickel mesh current collector are all nickel.

5. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 1, characterized in that, The tin layer is formed by melting a solder sheet.

6. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 5, wherein, The anode lead block, the porous nickel mesh current collector, and the tin layer are integrated.

7. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 1, characterized in that, There are 2 pins, which are connected to the bottom of the lower housing.

8. The electrochemical oxygen sensor based on the integrated tin layer of anode lead according to claim 7, characterized in that The first pair of electrode nickel strip conductive wires connect the bottom of the cathode plate, extend along the inner wall of the lower housing to the bottom of the lower housing, and are connected to one of the pins.

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