Three-electrode optical button cell and manufacturing method thereof

Abstract

The invention relates to a three-electrode optical button cell and a manufacturing method thereof, a metal wire is processed to form a reference electrode, the reference electrode is integrated in the button cell, and the reference electrode can provide a potential reference standard for a working electrode in the button cell. Therefore, parameters such as potential change of electrode reaction, electrochemical reaction kinetics and the like can be accurately measured, analysis of a reaction mechanism in the charging and discharging process of the battery is facilitated, performance misjudgment caused by electrode polarization is avoided, and reliable data is provided for research, development and optimization of electrode materials. The detection light beam can be projected to the positive pole piece through the accommodating hole, so that the substance change condition of an electrode material in the battery can be directly observed, for example, optical characteristics such as color change, structural evolution and the like of the electrode material in an electrochemical reaction process can be observed, and an optical detection function is realized.

Description

Technical Field

[0001] The present application relates to the technical field of button batteries, and in particular to a three-electrode optical button battery and a manufacturing method thereof. Background Art

[0002] With the booming development of small electronic devices such as smart watches, electronic thermometers, small wireless sensors, etc., button batteries are widely used to provide power support for these devices due to their small size and stable power supply performance.

[0003] Traditional button batteries usually adopt a simple two-electrode structure, mainly composed of basic components such as positive electrode, negative electrode, separator and electrolyte, and play an important role in meeting conventional power supply needs.

[0004] However, during the charge and discharge process, the electrode itself will undergo polarization, causing its potential to change continuously, which in turn leads to large errors in the measured working electrode potential. Therefore, it is difficult to achieve accurate electrochemical measurements with the traditional button battery structure. Summary of the Invention

[0005] Based on this, it is necessary to provide a three-electrode optical button battery and a manufacturing method thereof to address the problem that existing button batteries have difficulty in achieving accurate electrochemical measurements.

[0006] A method for manufacturing a three-electrode optical button battery, the method comprising:

[0007] Take the positive electrode shell, which is configured with a receiving hole;

[0008] Arrange the positive electrode shell and the negative electrode shell in a spaced manner;

[0009] The positive electrode sheet and the negative electrode sheet are arranged between the positive electrode shell and the negative electrode shell;

[0010] Taking a metal wire coated with a first insulating layer, and removing the first insulating layer at both ends of the metal wire;

[0011] Applying active slurry on one end of the metal wire to form a working area on the one end;

[0012] A second insulating layer is wrapped between the first insulating layer and the working area of ​​the metal wire to form a reference electrode;

[0013] Place the working area of ​​the reference electrode between the positive and negative electrodes;

[0014] Sealing the positive electrode shell;

[0015] The positive electrode shell, positive electrode sheet, reference electrode, negative electrode sheet and negative electrode shell are pressed and packaged.

[0016] In one embodiment, after arranging the positive electrode sheet and the negative electrode sheet between the positive electrode casing and the negative electrode casing, the method further includes: placing two separators between the positive electrode casing and the negative electrode casing.

[0017] In one embodiment, a method for placing a working area of ​​a reference electrode between a positive electrode plate and a negative electrode plate includes placing the reference electrode between two separators.

[0018] In one embodiment, before placing the working area of ​​the reference electrode between the positive electrode sheet and the negative electrode sheet, the method further includes: winding the working area of ​​the reference electrode into a ring shape.

[0019] In one embodiment, before the method of sealing the positive electrode shell, the method further includes: placing a positive electrode current collector between the positive electrode shell and the positive electrode plate, wherein the positive electrode current collector is provided with a through hole.

[0020] In one embodiment, the method for sealing the positive electrode shell includes: covering the receiving hole with quartz glass.

[0021] In one embodiment, after coating one end of the metal wire with active slurry to form a working area on the one end, the method further includes: sending the metal wire into an oven for heat treatment.

[0022] In one embodiment, the end of the reference electrode away from the working area is the measuring area, which extends relative to the negative electrode shell and is located above the negative electrode shell.

[0023] In one embodiment, the metal wire is made of copper wire;

[0024] The active slurry is made of lithium titanate;

[0025] The second insulating layer is insulating tape;

[0026] The positive electrode shell, positive electrode sheet, reference electrode, negative electrode sheet and negative electrode shell are pressed and packaged by hydraulic method.

[0027] A three-electrode optical button battery, comprising:

[0028] Battery housing, including positive electrode housing and negative electrode housing;

[0029] A positive electrode sheet and a negative electrode sheet are provided between the positive electrode shell and the negative electrode shell;

[0030] Two diaphragms are provided between the positive electrode sheet and the negative electrode sheet;

[0031] The reference electrode is at least partially disposed between the two diaphragms.

[0032] The three-electrode optical button cell and its manufacturing method are described above. By processing the metal wire to form a reference electrode and integrating it into the button cell, the reference electrode can provide a potential reference for the working electrode in the button cell, allowing for accurate measurement of parameters such as the potential change of the electrode reaction and the electrochemical reaction kinetics. This helps analyze the reaction mechanism during the battery's charge and discharge process, avoids performance misjudgments due to electrode polarization, and provides reliable data for the development and optimization of electrode materials. The detection light beam can be projected through the receiving hole to the positive electrode piece, allowing direct observation of the material changes of the electrode material inside the battery. For example, optical properties such as color changes and structural evolution of the electrode material during the electrochemical reaction can be observed, realizing optical detection functions. Furthermore, optical information such as the spectrum of the electrode material during charge and discharge can be obtained, revealing the material's response to light of different wavelengths and the relationship between energy level state changes and electrochemical reactions. This provides a basis for studying the optical properties of electrode materials and optimizing optical imaging wavelengths, significantly improving the application value of button cells in electrochemical and optical measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0034] Figure 1 This is a flow chart of a method for manufacturing a three-electrode optical button battery provided in one embodiment of the present application.

[0035] Figure 2 A schematic diagram of a three-electrode optical button cell provided in one embodiment of the present application.

[0036] Figure 3 A schematic diagram of a three-electrode optical button battery provided in another embodiment of the present application.

[0037] Figure 4 A schematic diagram of charging and discharging of a three-electrode optical button battery provided in one embodiment of the present application.

[0038] Figure numerals: 110, positive electrode shell; 111, accommodating hole; 120, quartz glass; 130, positive electrode current collector; 140, positive electrode plate; 150, diaphragm; 160, reference electrode; 161, working area; 162, measuring area; 170, negative electrode plate; 180, gasket; 190, negative electrode shell. DETAILED DESCRIPTION

[0039] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0042] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0045] With the rapid development of small electronic devices such as smartwatches, electronic thermometers, and small wireless sensors, button batteries are widely used to power these devices due to their compact size and stable power supply performance. Traditional button batteries typically use a simple two-electrode structure, consisting of basic components such as the positive electrode, negative electrode, separator, and electrolyte, playing an important role in meeting conventional power supply needs.

[0046] The inventors of this application found that when conducting in-depth electrochemical research and optical testing on button batteries in the laboratory, the traditional button battery structure exposed many limitations. In electrochemical measurements, accurately knowing the changes in electrode potential is crucial for understanding the electrochemical reaction mechanism inside the battery and evaluating electrode performance. In the traditional two-electrode structure, it is often difficult to accurately measure the potential change of the working electrode relative to a stable potential reference. Specifically, during the charge and discharge process, the electrode itself will undergo polarization, causing its potential to change continuously, which in turn leads to a large error in the measured working electrode potential, which cannot truly reflect the actual state of the working electrode in the electrochemical reaction, seriously hindering the accurate analysis of the electrochemical behavior of the electrode material and the research and development of high-performance electrode materials, and is not conducive to a comprehensive and in-depth exploration of the electrochemical reaction kinetics of the button battery. In addition, due to its structural design, the battery shell of the traditional button battery is usually opaque, which makes it impossible to directly observe the real-time changes of the electrode material inside the battery during the charge and discharge process. For example, if one wants to understand the optical properties of electrode materials during electrochemical reactions, such as color changes and structural evolution, in order to analyze their correlation with electrochemical performance, traditional button batteries cannot provide the corresponding visual window, making it difficult to conduct in-situ optical detection and analysis. As a result, in laboratory research, different equipment and battery systems need to be used to conduct electrochemical and optical experiments, which is not only cumbersome but also prone to experimental errors due to differences between different systems, affecting the accurate evaluation of the comprehensive performance of button batteries.

[0047] Based on this, one embodiment of the present application provides a method for fabricating a three-electrode optical button cell. The button cell fabricated by this method can perform electrochemical and optical measurements, significantly improving the application value of the button cell in these applications. The following, combined with the accompanying drawings, provides a detailed description of the method for fabricating a three-electrode optical button cell provided in one embodiment of the present application.

[0048] See Figures 1 to 3 As shown, a method for manufacturing a three-electrode optical button cell provided in one embodiment of the present application includes the following steps:

[0049] In step S110 , a positive electrode casing 110 is obtained. The positive electrode casing 110 is configured with a receiving hole 111 .

[0050] Among them, the accommodating hole 111 can be used to install the reference electrode 160, which can provide a precise installation and positioning space for the reference electrode 160, ensure that the position of the reference electrode 160 inside the battery is stable, and effectively contact the positive and negative electrodes and the electrolyte, thereby building a reliable three-electrode system, which can accurately measure the working electrode potential, avoid the potential measurement error caused by the displacement of the reference electrode 160, and improve the accuracy of electrochemical testing.

[0051] In step S120 , the positive electrode casing 110 and the negative electrode casing 190 are arranged in a spaced relationship.

[0052] The positive electrode casing 110 and the negative electrode casing 190 can be made of metal (such as stainless steel or nickel-plated steel) or polymer materials (such as PPS or ABS). The positive electrode casing 110 and the negative electrode casing 190 cooperate to form a closed or semi-closed cavity that contains the electrolyte, electrode plates, and the separator 150. This ensures ionic conduction between the positive and negative electrodes through the electrolyte and separator 150, forming an electrochemical circuit. In some embodiments, an insulating spacer 180, such as a ceramic sheet or a rigid plastic sheet, is placed between the positive electrode casing 110 and the negative electrode casing 190.

[0053] In step S130 , the positive electrode sheet 140 and the negative electrode sheet 170 are spaced apart and arranged between the positive electrode casing 110 and the negative electrode casing 190 .

[0054] The appropriate positive electrode material can be selected based on the desired button cell performance and application type. For example, graphite slurry is often used for lithium-manganese button cells. The graphite slurry is coated on a copper mesh and dried to form a porous positive electrode sheet 140. Common metallic lithium sheets can be used as the negative electrode material to ensure good electrochemical activity and stability. Before use, they should be properly cleaned to remove surface impurities. The negative electrode sheet 170 should be laid flat on the bottom of the negative electrode casing 190, and the positive electrode sheet 140 should be laid flat on the bottom of the positive electrode casing 110, ensuring that the center of the sheet is aligned with the center of the casing.

[0055] In one embodiment, after arranging the positive electrode sheet 140 and the negative electrode sheet 170 between the positive electrode casing 110 and the negative electrode casing 190 , the method further includes: placing two separators 150 between the positive electrode casing 110 and the negative electrode casing 190 .

[0056] The two separators 150 are flatly covered on the negative electrode sheet 170 and the positive electrode sheet 140, respectively, and the edges of the separators 150 should extend slightly beyond the edges of the positive and negative electrode sheets 140 and 170 to prevent short circuits between the positive and negative electrodes. The separator 150 material can be selected from porous polymer materials such as polyethylene (PE) and polypropylene (PP), and cut to a suitable size. The separator 150 can effectively separate the positive electrode sheet 140 and the negative electrode sheet 170, while also having good ion permeability, ensuring that lithium ions and other ions can pass smoothly, preventing direct contact and short circuits between the positive and negative electrode sheets 140 and 170. Correspondingly, the reference electrode 160 can be placed between the two separators 150.

[0057] Step S140 , taking a metal wire with a surface coated with a first insulating layer, and removing the first insulating layer from both ends of the metal wire.

[0058] Among them, the material of the metal wire can be copper wire. Copper has excellent conductivity and can efficiently transmit current, ensuring the accuracy of the potential measurement of the reference electrode 160, allowing the battery electrochemical signal to be transmitted stably, and helping to accurately obtain the electrode potential data. In the electrochemical environment common in button batteries, copper wire is not prone to rapid corrosion, oxidation and other reactions, and can maintain a relatively stable structure and performance, ensuring that the reference electrode 160 functions continuously and effectively. Copper wire is soft in texture and flexible, making it convenient for cutting, bending, packaging and other operations. It is conducive to arrangement in the limited space of button batteries, adapting to the miniaturized structure of batteries, and is widely available and relatively inexpensive, making it convenient for large-scale application and production.

[0059] In other embodiments, materials such as lithium titanate and lithium iron phosphate can also be used as reference electrode 160 after in-situ lithiation. These materials have stable potentials and good cycling performance, can maintain a relatively constant potential during battery operation, and some materials are highly safe. However, the preparation and in-situ lithiation processes are relatively complex and require precise control of conditions.

[0060] In some embodiments, the first insulating layer (insulating varnish) and impurities at both ends of the copper wire may be removed by soaking in sulfuric acid solution, polishing with sandpaper, or scraping with a scraper to make the surface smooth.

[0061] In step S150 , active slurry is coated on one end of the metal wire to form a working area 161 at the one end.

[0062] Among them, an active slurry can be deposited on the surface of the metal wire through an electrochemical reaction, such as depositing active slurries such as lithium titanate and lithium iron phosphate, so as to form a uniform, stable and appropriately thick lithium metal layer at one end of the metal wire, construct a stable reference electrode 160 potential, ensure potential stability during the cycle, assist in monitoring the potential changes of the positive and negative electrodes, and provide a stable and known potential reference for battery electrochemical measurements. Lithium titanate can achieve lithium ion insertion and extraction reactions by virtue of its own good electrochemical reversibility. For example, in a lithium-ion battery system, lithium ions are embedded in the lithium titanate lattice during charging and extracted during discharge, and the corresponding electrode reaction is stable. At the same time, the volume change of lithium titanate during the charging and discharging process is extremely small, which can ensure the stability of the structure of the working area 161, reduce problems such as active material shedding and poor contact caused by electrode expansion or contraction, and improve the battery cycle life and reliability.

[0063] In one embodiment, after coating one end of the metal wire with active slurry to form the working area 161 at the one end, the method further includes: sending the metal wire into an oven for heat treatment.

[0064] Heat treatment can promote the formation of a more regular and ordered crystal structure in the active material. A suitable crystal state facilitates the insertion and extraction of ions into and out of the active material lattice, enhancing the electrochemical activity of the electrode. During the preparation and coating process, the active material may be contaminated with impurities (such as inadequately dispersed agglomerated particles and dust from the air). The material itself also contains a certain amount of solvents and small volatile molecules. During heat treatment in an oven, the higher temperature volatilizes or decomposes these impurities and volatiles, thereby purifying the components of the working region 161. This helps reduce the interference of impurities on the electrochemical performance of the electrode, mitigates problems such as electrode polarization and increased internal resistance caused by impurities, and improves the overall performance of the battery. Removing volatiles and impurities enhances the chemical stability of the working region 161, making it more resistant to electrolyte corrosion and potential side reactions within the battery. For example, residual organic solvents may react with lithium salts, affecting the performance of the electrolyte. Heat treatment removes these substances, maintaining a favorable chemical environment for the electrolyte and ensuring the proper operation of the battery.

[0065] In step S160 , a second insulating layer is formed between the first insulating layer and the working area 161 to form a reference electrode 160 .

[0066] Taking the example of a copper wire as the metal wire and an insulating varnish as the first insulating layer, a second insulating layer is provided in the transition region between the insulating varnish and the working area 161 to protect the active slurry and prevent external impurities and moisture from entering the working area 161 and affecting the performance of the lithium titanate active slurry and the electrochemical behavior of the electrodes. This further strengthens the insulation effect, forming a double insulation protection, greatly reducing the risk of short circuits between the electrodes and ensuring that the electrochemical reactions within the button battery can proceed in a safe and stable electrically isolated environment. At the same time, the second insulating layer can reduce the interference of external factors on electrochemical parameters such as the potential of the working area 161, making the measured potential changes of the working electrode relative to the reference electrode 160 more realistic and reliable, facilitating accurate analysis of the electrochemical reaction mechanism within the battery and performance changes of the electrode materials.

[0067] In some embodiments, the second insulating layer may be an insulating tape. In other embodiments, the second insulating layer may also be a polytetrafluoroethylene (PTFE) tube tightly wrapped around the working area 161, using heat shrinking or other methods to ensure a firm wrapping and provide insulation.

[0068] In one embodiment, after the reference electrode 160 is formed, the working area 161 of the reference electrode 160 may be wound into a ring shape.

[0069] Arranging the reference electrode 160's working area 161 in a ring shape allows it to contact the battery's internal electrolyte and the electrochemical environment of the positive and negative electrodes from multiple directions, thereby more comprehensively and evenly sensing the battery's internal potential. Compared to single-point or local potential sensing methods, the ring structure can average the effects of potential fluctuations caused by different locations, providing a more uniform and stable potential reference for measuring the working electrode's potential changes relative to it, facilitating more accurate analysis of the electrode's electrochemical behavior, such as accurately determining whether redox reactions at various locations on the electrode surface are proceeding synchronously and uniformly. Because the ring-shaped working area 161 is spatially distributed, it can more closely align with the electrolyte environment surrounding the positive and negative electrode sheets 170, reducing potential measurement errors caused by distance. For example, when conducting high-precision electrochemical testing, the ring-shaped reference electrode 160's working area 161 can more quickly and accurately capture subtle changes in potential near the positive and negative electrode sheets 170, allowing the measured potential data to better reflect the true electrochemical state within the battery, thereby improving the accuracy of battery performance assessment. The internal space of the button battery is limited. The annular reference electrode 160 working area 161 can make full use of its shape characteristics to achieve a larger area or length of the working area 161 without taking up too much extra space, so that it can be better integrated into the internal structure of the battery.

[0070] In step S170 , the working area 161 of the reference electrode 160 is placed between the positive electrode sheet 140 and the negative electrode sheet 170 .

[0071] The working area 161 of the reference electrode 160 is located between the positive and negative pole pieces 170, and can sense the electrochemical environment inside the battery more directly and accurately. Due to its own stable potential characteristics, it can provide a reliable and accurate benchmark for measuring the potential changes of the positive pole piece 140 and the negative pole piece 170 relative to it. During the charging and discharging process of the button battery, the accurate value of the working electrode potential can be obtained in real time, which helps to accurately analyze the redox reaction process on the electrode surface and judge the embedding and extraction of key ions such as lithium ions. At the same time, because the reference electrode 160 is close to the positive and negative pole pieces 170, the working area 161 of the reference electrode 160 can capture the real potential changes faster and more accurately, making the measurement data closer to the actual electrochemical behavior, thereby improving the accuracy of the electrode performance evaluation.

[0072] In one embodiment, the method further includes: placing a positive electrode current collector 130 between the positive electrode casing 110 and the positive electrode plate 140 , wherein the positive electrode current collector 130 is provided with a through hole.

[0073] The thickness and dimensions of the positive electrode current collector 130 are determined by the specifications of the button cell. The positive electrode current collector 130 is typically made of a material with excellent conductivity, enabling it to quickly collect and conduct electrons generated during the electrochemical reaction of the positive electrode plate 140. The inclusion of through-holes in the positive electrode current collector 130 further increases the number of paths available for electron transmission, allowing electrons to be conducted through multiple channels, including the through-holes and the surface of the current collector. This effectively reduces the resistance to electron transmission and improves the efficiency of electron conduction. Furthermore, the presence of through-holes allows for closer and more complete contact between the positive electrode current collector 130 and the positive electrode plate 140. During battery assembly, when the positive electrode plate 140 is overlaid on the current collector with through-holes, portions of the plate material can be embedded in the through-holes, increasing the contact area between the two and reducing electron transmission barriers caused by poor contact. This helps ensure that electrons can smoothly transfer from the positive electrode plate 140 to the current collector and then to the external circuit, ensuring good overall conductivity of the battery. In some embodiments, the positive electrode current collector 130 may be copper foil.

[0074] Step S180 : sealing the positive electrode casing 110 .

[0075] Sealing the positive electrode housing 110 maintains a stable chemical environment within the battery, preventing external impurities from entering the battery and maintaining a stable electrode potential. Sealing prevents the positive and negative electrodes inside the battery from accidentally contacting external conductive objects through the housing 111, reducing the risk of short circuits.

[0076] In one embodiment, the method for sealing the positive electrode casing 110 includes covering the receiving hole 111 with quartz glass 120. Quartz glass 120 has excellent insulation properties and a very high resistivity, effectively blocking the passage of current. Covering the receiving hole 111 with quartz glass prevents the positive and negative electrodes inside the battery from accidentally making conductive contact with the outside through the receiving hole 111, significantly reducing the possibility of short circuits. Furthermore, quartz glass 120 enables transparent visualization of button cells. It allows light to pass through, enabling in-situ optical observation and testing without disrupting the battery seal, providing a convenient visualization method for gaining a deeper understanding of the battery's internal reaction mechanisms and evaluating battery performance. In some embodiments, the quartz glass 120 and the positive electrode casing 110 are bonded together using a sealing insulating adhesive. For example, a layer of sealing insulating adhesive is applied to the edge of the receiving hole 111 of the positive electrode casing 110, and then the quartz glass 120 is pressed onto the positive electrode casing 110. After flattening, the sealing insulating adhesive can be cured in an oven, thereby achieving a sealed connection between the quartz glass 120 and the positive electrode casing 110.

[0077] In step S190 , the positive electrode casing 110 , the positive electrode sheet 140 , the reference electrode 160 , the negative electrode sheet 170 and the negative electrode casing 190 are press-fitted and packaged.

[0078] By pressing and packaging, the components such as the positive electrode shell 110, the positive electrode sheet 140, the reference electrode 160, the negative electrode sheet 170 and the negative electrode shell 190 can be tightly fitted together, fixing them in their respective relatively accurate positions, and preventing the components from shifting or loosening during the subsequent use, transportation and storage of the battery. For example, if the reference electrode 160 is displaced inside the battery, it may affect its accurate measurement of the potential, and the press-fit packaging can ensure that it is stable in the set position and functions reliably. The pressing process will make the contact between the positive electrode sheet 140 and the positive electrode shell 110, the negative electrode sheet 170 and the negative electrode shell 190, and each electrode closer, reducing the contact resistance, ensuring that electrons can be smoothly conducted between the electrodes, the current collector and the shell, improving the conductivity of the battery, and facilitating the battery to achieve efficient energy conversion during the charging and discharging process, thereby improving the charging and discharging efficiency.

[0079] In some embodiments, a hydraulic system can be used to press-fit and package multiple components. The hydraulic system can provide stable and uniform pressure distribution. During the press-fit packaging process, each component, such as the positive electrode housing 110, the electrode sheet, and the reference electrode 160, is subjected to relatively consistent pressure, whether in the center or at the edge of the battery. This helps avoid problems such as loose fitting or excessive squeezing of components due to local pressure differences. For example, it prevents certain parts from being sealed due to insufficient pressure, or some electrode sheets from being damaged or deformed due to excessive pressure, thereby ensuring the integrity and stability of the entire internal structure of the button battery. The hydraulic system can include a hydraulic pump, a hydraulic cylinder, and a hydraulic valve. The hydraulic pump (such as a gear pump or a vane pump) converts mechanical energy into hydraulic energy, the hydraulic cylinder converts hydraulic energy into mechanical energy, and the hydraulic valve (such as a relief valve, a pressure reducing valve, a throttle valve, a speed regulating valve, and a reversing valve) controls the pressure, flow, and direction of the hydraulic oil in the hydraulic system.

[0080] In some other embodiments, mechanical pressing can be used to achieve packaging. In other embodiments, thermal pressing can be used.

[0081] See Figure 2 and Figure 3 As shown, in one embodiment, one end of the reference electrode 160 away from the working area 161 is a measuring area 162 . The measuring area 162 extends relative to the negative electrode casing 190 and is located above the negative electrode casing 190 .

[0082] When performing electrochemical measurements, the position of measurement area 162, extending above the negative electrode housing 190, facilitates easier connection of measurement leads. Operators can easily and accurately place the measurement probe into contact with measurement area 162, making the measurement process more efficient and accurate. Because measurement area 162 is located above the negative electrode housing 190, it is away from areas within the battery where the positive and negative electrode tabs 170 could accidentally short-circuit. This effectively prevents short circuits caused by improper operation (such as accidentally contacting the positive and negative electrodes with the measurement leads) when connecting the measurement equipment for potential measurements.

[0083] The above-mentioned manufacturing method forms a reference electrode 160 by processing the metal wire and integrating it into the button cell. The reference electrode 160 can provide a potential reference for the working electrode in the button cell, so as to accurately measure the potential change of the electrode reaction, the electrochemical reaction kinetics and other parameters. This helps to analyze the reaction mechanism during the battery charging and discharging process, avoids performance misjudgment due to electrode polarization, and provides reliable data for the development and optimization of electrode materials. The detection light beam can be projected onto the positive electrode plate 140 through the receiving hole 111, thereby directly observing the material changes of the electrode material inside the battery. For example, the color change and structural evolution of the electrode material during the electrochemical reaction can be observed, realizing the optical detection function. In addition, optical information such as the spectrum of the electrode material during charging and discharging can be obtained, revealing the material's response to light of different wavelengths and the relationship between energy level state changes and electrochemical reactions. This provides a basis for studying the optical properties of electrode materials and optimizing optical imaging wavelengths, significantly improving the application value of button cells in electrochemical and optical measurements.

[0084] like Figure 4 As shown, it is a schematic diagram of the charge and discharge of a three-electrode optical button battery provided in an embodiment of the present application. Among them, the horizontal axis represents time, the unit is seconds, which is used to measure the time process of the battery test process, reflects the state at different times from the beginning to the end of the test, and reflects the changes in the electrochemical behavior of the battery over time during the discharge process. The vertical axis represents the 1 / 10C discharge voltage, the unit is volts, which reflects the voltage performance of the battery when it is discharged at a 1 / 10C rate (C is the concept of charge and discharge rate related to the battery capacity, 1 / 10C means discharging at a current of one tenth of the battery capacity), and shows the voltage values ​​and change trends of the battery at different time points. It can be seen that due to the provision of a reference electrode 160 in this button battery, the potential of graphite relative to lithium is relatively stable and has small fluctuations, which can avoid the interference of electrode polarization on the measurement and accurately capture the electrochemical behavior of the working electrode.

[0085] Further, see Figure 2 and Figure 3As shown, an embodiment of the present application also provides a three-electrode optical button battery, including a battery housing, a positive electrode sheet 140, a negative electrode sheet 170, two separators 150 and a reference electrode 160; the battery housing includes a positive electrode housing 110 and a negative electrode housing 190; the positive electrode sheet 140 and the negative electrode sheet 170 are arranged between the positive electrode housing 110 and the negative electrode housing 190; the two separators 150 are arranged between the positive electrode sheet 140 and the negative electrode sheet 170; the reference electrode 160 is at least partially arranged between the two separators 150.

[0086] By integrating the reference electrode 160 into the button cell, the reference electrode 160 can provide a potential reference for the working electrode in the button cell, allowing for accurate measurement of parameters such as the potential change of the electrode reaction and the electrochemical reaction kinetics. This helps analyze the reaction mechanism during the battery's charge and discharge process, avoids performance misjudgments due to electrode polarization, and provides reliable data for the development and optimization of electrode materials. The detection light beam can be projected onto the positive electrode plate 140 through the receiving hole 111, thereby directly observing the material changes of the electrode material inside the battery. For example, optical properties such as color changes and structural evolution of the electrode material during the electrochemical reaction can be observed, realizing optical detection functions. Furthermore, optical information such as the spectrum of the electrode material during charge and discharge can be obtained, revealing the material's response to light of different wavelengths, the relationship between energy level state changes and electrochemical reactions, and providing a basis for studying the optical properties of electrode materials and optimizing optical imaging wavelengths, significantly improving the application value of button cells in electrochemical and optical measurements.

[0087] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for manufacturing a three-electrode optical button battery, characterized in that: The manufacturing method of the three-electrode optical button cell comprises: Take the positive electrode shell, which is configured with a receiving hole; Arrange the positive electrode shell and the negative electrode shell in a spaced manner; The positive electrode sheet and the negative electrode sheet are arranged between the positive electrode shell and the negative electrode shell; Taking a metal wire coated with a first insulating layer, and removing the first insulating layer at both ends of the metal wire; coating one end of the metal wire with an active slurry to form a working area at one end; A second insulating layer is wrapped between the first insulating layer and the working area of ​​the metal wire to form a reference electrode; Place the working area of ​​the reference electrode between the positive and negative electrodes; Sealing the positive electrode shell; The positive electrode shell, positive electrode sheet, reference electrode, negative electrode sheet and negative electrode shell are pressed and packaged.

2. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: After arranging the positive electrode sheet and the negative electrode sheet between the positive electrode shell and the negative electrode shell, the method further includes: placing two separators between the positive electrode shell and the negative electrode shell.

3. The method for manufacturing a three-electrode optical button cell according to claim 2, wherein: A method for placing a working area of ​​a reference electrode between a positive electrode sheet and a negative electrode sheet includes placing the reference electrode between two diaphragms.

4. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: Before placing the working area of ​​the reference electrode between the positive electrode piece and the negative electrode piece, the method further includes: winding the working area of ​​the reference electrode into a ring shape.

5. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: Before the method of sealing the positive electrode shell, the method further includes: placing a positive electrode current collector between the positive electrode shell and the positive electrode plate, and the positive electrode current collector is provided with a through hole.

6. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: The method for sealing the positive electrode shell includes: covering the accommodating hole with quartz glass.

7. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: After coating one end of the metal wire with active slurry to form a working area on the one end, the method further includes: sending the metal wire into an oven for heat treatment.

8. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: One end of the reference electrode away from the working area is a measuring area, which extends relative to the negative electrode shell and is located above the negative electrode shell.

9. The method for manufacturing a three-electrode optical button cell according to claim 1, wherein: The material of the metal wire is copper wire; The active slurry is made of lithium titanate; The second insulating layer is insulating tape; The positive electrode shell, positive electrode sheet, reference electrode, negative electrode sheet and negative electrode shell are pressed and packaged by hydraulic method.

10. A three-electrode optical button battery, characterized in that: include: Battery housing, including positive electrode housing and negative electrode housing; A positive electrode sheet and a negative electrode sheet are provided between the positive electrode shell and the negative electrode shell; Two diaphragms are provided between the positive electrode sheet and the negative electrode sheet; The reference electrode is at least partially disposed between the two diaphragms.

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