Light-driven lithium battery internal associated magnetic information equivalent simulation device in weak magnetic environment

Abstract

The invention discloses a light-driven lithium battery internal associated magnetic information equivalent simulation device in a weak magnetic environment. The light-driven lithium battery internal associated magnetic information equivalent simulation device is mainly composed of a host, a weak magnetic signal sensor, an optical fiber laser, a single-mode optical fiber, an optical fiber three-dimensional deflection table, a lithium ion battery electrolyte, a lithium ion microsphere, a non-magnetic objective table, a zero magnetic microscopic system, a magnetic shielding chamber and the like. According to the light-driven lithium battery internal associated magnetic information equivalent simulation device in the weak magnetic environment disclosed by the invention, the dynamic movement process of lithium particles in a lithium ion battery electrolyte can be simulated, observed and recorded in a mode of generating thermal turbulence through the optical fiber; and magnetic information generated in the dynamic movement process of lithium particles in the lithium ion battery electrolyte is detected in real time.

Description

Technical Field

[0001] The invention belongs to the field of intelligent manufacturing instruments, and mainly relates to an equivalent simulation device for the internal associated magnetic information of a lithium battery driven by light in a weak magnetic environment. Background Art

[0002] Traditional energy sources such as coal, oil and natural gas have long maintained the high-speed operation of modern industry and society. They support the power supply, transportation and industrialization process of most countries in the world. The widespread use of coal promoted the take-off of the early industrial revolution, and oil played an irreplaceable role in ensuring transportation. The large-scale exploitation and use of these resources has enabled human society to progress and develop rapidly. However, with the globalization of the economy and the increase in population, the dependence on traditional energy has obviously produced some unsustainable environmental and economic impacts. The first to bear the brunt are environmental problems such as air pollution, acid rain and water pollution, which are all caused by the burning of traditional energy such as fossil fuels. In addition, traditional energy itself has the natural property of being non-renewable, and further exploitation and utilization of it will further deplete its reserves. If we still maintain a high dependence on traditional energy, human society will face a systemic social and financial risk caused by the depletion of traditional energy in the next few decades. Considering the severity of these problems, the world is gradually transitioning to renewable energy fields such as wind power, solar energy, geothermal energy, and hydropower to explore a green energy solution that is more sustainable and has less impact on the environment.

[0003] However, current episodic energy sources such as wind, solar, and hydropower are accompanied by irregular, intermittent, and unstable nature of generation time. Therefore, an effective energy storage system is needed to store excess electricity and release it when demand peaks or production is insufficient. This can not only balance the power grid and prevent overload, but also improve the utilization efficiency of renewable energy and reduce dependence on traditional energy. Therefore, the development of energy storage technology will be the most core factor in the large-scale promotion and utilization of new clean energy. In countless visions of future technology, energy storage and conversion always play a central role. As we enter an era of greater environmental protection and efficiency, lithium-ion batteries have become the pioneers of energy storage technology revolution in many fields with their excellent performance. Lithium-ion batteries show good application potential due to their many charge and discharge cycles, low self-discharge rate, and high energy density. First of all, the biggest advantage of lithium-ion batteries is their high energy density, which means that more electrical energy can be stored in a relatively small volume and low weight. This feature makes them an ideal energy choice for portable electronic products such as mobile devices and laptops, helping these products to provide long battery life while remaining lightweight. In addition to portable electronic products, another key application area of ​​lithium-ion batteries is transportation. As the global automotive industry gradually shifts from reliance on fossil fuels to electrification, lithium-ion batteries have become the preferred power source for electric vehicles due to their long life and high efficiency. Not only can they significantly reduce dependence on oil and gas resources and exhaust emissions, promote the development of clean transportation, but they have also driven innovation in the design and manufacturing of the entire automotive industry.

[0004] Lithium-ion batteries (LIBs) are rechargeable batteries that provide energy through the reversible insertion and extraction of lithium ions. Since their commercialization in the early 1990s, they have become a ubiquitous energy source in portable electronic devices due to their excellent energy density, high voltage and long cycle life. In recent years, with the increasing demand for electric vehicles and large-scale energy storage systems, the research and development of lithium-ion batteries has become particularly urgent. However, understanding their working principles is the key to achieving more efficient energy conversion and storage. Lithium-ion batteries are composed of positive electrodes, negative electrodes, lithium-ion battery electrolytes and separators. The positive electrode is usually made of layered or olivine structured materials, and the negative electrode is mostly graphite. During the charge and discharge process, lithium ions migrate between the electrodes, promoting electrochemical reactions, allowing the battery to release energy or store energy. During the discharge phase, lithium ions in the positive electrode migrate to the negative electrode through the internal lithium-ion battery electrolyte. After reaching the negative electrode, the lithium ions are embedded in the interlayers of carbon (graphite), that is, there is enough space between the hexagonal close-packed graphite layers to provide a place for lithium ions to be embedded. Under the action of Coulomb force, each time a lithium ion is embedded, an electron will be guided to flow from the positive electrode to the negative electrode through the external circuit. This process releases electrical energy for use by the external circuit. The charging stage is the reverse process of the discharge process. When the external power supply is used to charge the battery, the potential difference between the electrodes drives the electrons to flow from the negative electrode to the positive electrode through the external circuit in the reverse direction. At the same time, the lithium ions on the negative electrode are released and pass through the lithium-ion battery electrolyte and return to the positive electrode. In this stage, the battery uses external power to make lithium ions "embed" from the negative electrode and "embed" into the positive electrode to achieve energy storage. The role of the lithium-ion battery electrolyte is to provide a channel for lithium ions from one electrode to another. The lithium-ion battery electrolyte is usually a mixture of organic solvents, lithium salts and some additives. Among them, lithium salts such as LiPF6 can provide lithium ions, and organic solvents provide a medium for lithium ion transmission. The diaphragm is an ultra-microporous polymer film, which prevents direct contact between the electrodes to avoid short circuits while allowing lithium ions to pass freely. Although the basic working principle of lithium-ion batteries is relatively simple, their optimized design and charge state management are relatively complex. The selection of electrode materials, the formulation of lithium-ion battery electrolytes, and the precise control of the battery management system are all key factors in improving battery performance and ensuring safe and stable battery operation. For example, the selection of different types of positive electrode materials, such as lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), and lithium iron phosphate (LiFePO4), can affect the battery's energy density, power density, safety, and cost performance indicators. Similarly, the development of negative electrode materials, such as silicon-carbon (Si / C) composites, aims to improve their lithium storage capacity, thereby increasing the energy density of the battery.

[0005] The study of the charging and discharging process of lithium-ion batteries plays an extremely critical role in the current field of science and technology and energy, and has far-reaching research significance. By deeply understanding the charging and discharging mechanism of lithium-ion batteries, key factors affecting their performance, such as the selection of electrode materials, the composition of lithium-ion battery electrolytes, and the ratio of additives, can be identified and optimized to improve the energy density and charging and discharging efficiency of the battery. In addition, the battery will experience capacity decay after multiple charge and discharge cycles. Studying the charging and discharging process can help discover the microscopic causes of the decay, thereby improving the design, reducing the decay rate, and extending the battery life. However, because the charging and discharging process of lithium-ion batteries involves the combined action of multiple mixed compounds including lithium-ion battery electrolytes, positive and negative plates, and diaphragms. And the charging, discharging, and working process of lithium-ion batteries are completely wrapped by external packaging materials, which prevents the naked eye from directly identifying the inside of the battery. The existing research methods cannot intuitively obtain the movement process of lithium ions in lithium-ion battery electrolytes and their impact on the inside of the battery. Electro-thermophoresis is a physical phenomenon that involves the movement of particles under the combined action of electric fields and temperature gradients. When a local area in a liquid is heated with a laser, particles in the liquid move rapidly toward the heated area.

[0006] Therefore, the present invention discloses an equivalent simulation device for the internal associated magnetic information of a lithium battery driven by light under a weak magnetic environment. The electromagnetic thermophoresis effect of the optical fiber tweezers is used to drive the lithium ions in the electrolyte of the lithium ion battery to perform thermal turbulent motion to simulate the charging and discharging process of the lithium ion battery, and the weak magnetic signal sensor is used to collect and receive the weak magnetic information generated during the movement of the lithium ions to analyze the influence of different lithium ion battery electrolyte environments on the energy density and charging and discharging efficiency of the lithium ion battery. Summary of the invention

[0007] The present invention aims to solve the related problems existing in the existing simulation of lithium-ion battery charging and discharging process. The present invention designs and discloses a light-driven lithium battery internal associated magnetic information equivalent simulation device under a weak magnetic environment.

[0008] According to an example of the present invention, a light-driven lithium battery internal associated magnetic information equivalent simulation device in a weak magnetic environment. Among them, the magnetic shielding room is made of seven layers of Permalloy plates, and the interior is a 3m×3m×3m cubic space. The residual magnetism in the central area is less than 0.2nT, which can effectively shield external magnetic information. The device disclosed in the patent of this invention is placed as a whole in the central area of ​​the magnetic shielding room.

[0009] According to an example of the present invention, a light-driven lithium battery internal associated magnetic information equivalent simulation device under a weak magnetic environment is provided. In some examples, the host is a 64-bit industrial computer, which can receive weak magnetic information generated by the movement of lithium ions in the electrolyte of the lithium ion battery caused by thermal turbulence collected by the weak magnetic signal sensor.

[0010] According to an example of the present invention, a light-driven lithium battery internal associated magnetic information equivalent simulation device in a weak magnetic environment is provided, wherein the weak magnetic signal sensor is an atomic magnetometer with an accuracy of up to 15fT, and a high spatial resolution sensor measurement array with a spatial resolution of <10mm can be established.

[0011] According to an example of the present invention, a light-driven lithium battery internal associated magnetic information equivalent simulation device under weak magnetic environment. The fiber laser is a fiber laser with a wavelength of 1550nm and a power of 150mW. The fiber laser outer end and the fiber jumper are coupled together by a fiber flange, and extend into the central area of ​​the magnetic shielding room through the ventilation hole between the magnetic shielding room and the outside world, and a beam of infrared laser with a wavelength of 1550nm is injected into the electrolyte of the lithium-ion battery.

[0012] According to an example of the present invention, a light-driven lithium battery internal associated magnetic information equivalent simulation device under a weak magnetic environment is provided. Among them, a single-mode optical fiber is connected to a fiber laser through a flange, and the single-mode laser is introduced into the electrolyte of the lithium-ion battery through a through hole on the wall of the magnetic shielding room. At this time, the three-dimensional deflection table of the optical fiber is adjusted so that the output end face of the clamped single-mode optical fiber has the ability to move in three directions of X, Y, and Z. In the zero-magnetic microscope system, the image clarity of the output end face of the optical fiber is observed at this time, and the optical fiber laser is turned on to introduce a 1550nm single-mode laser into the electrolyte of the lithium-ion battery. After waiting for about 10s, it can be observed that the 1550nm infrared laser produces a thermal turbulence effect in the electrolyte of the lithium-ion battery. At this time, the weak magnetic signal generated by the particles in the electrolyte of the lithium-ion battery due to thermal turbulence is captured by a weak magnetic signal sensor, and the weak magnetic information generated by the movement of particles during the charging and discharging process of the lithium battery is simulated.

[0013] According to some embodiments of the present invention, a light-driven equivalent simulation device for the internal associated magnetic information of a lithium battery under a weak magnetic environment is provided, wherein a fiber laser is used as a micro-area heat source to induce a thermal turbulence effect inside the electrolyte of a lithium-ion battery, and the internal lithium particles are controlled to move in a directional manner under the thermal turbulence effect to generate a weak magnetic signal. Compared with the prior art, the present invention is characterized in that:

[0014] (1) The present invention discloses a light-driven equivalent simulation device for the associated magnetic information inside a lithium battery under a weak magnetic environment, which can simulate, observe and record the dynamic movement of lithium particles inside the electrolyte of a lithium-ion battery by generating thermal turbulence through optical fiber.

[0015] (2) The present invention discloses a light-driven equivalent simulation device for the internal associated magnetic information of a lithium battery under a weak magnetic environment, which detects in real time the magnetic information generated during the dynamic movement of lithium particles in the electrolyte of a lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle of an equivalent simulation device for the internal associated magnetic information of a lithium battery driven by light under a weak magnetic environment in the implementation of the present invention.

[0017] Item numbers in the figure: 1-host, 2-weak magnetic signal sensor, 3-fiber laser, 4-single-mode optical fiber, 5-fiber 3D deflection table, 6-non-magnetic stage, 7-lithium-ion battery electrolyte, 8-zero-magnetic microscope system, 9-magnetic shielding room.

[0018] Figure 2 Schematic diagram of the thermal turbulence front principle in the implementation of the present invention.

[0019] Item numbers in the figure: 4-single-mode optical fiber, 6-non-magnetic stage, 7-lithium-ion battery electrolyte, 10-lithium-ion microspheres. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. In the description of the present invention, it should be understood that the orientation description, such as the orientation or position relationship indicated by the upper and lower instructions, is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In the description of the present invention, multiple refers to more than two. If there is a description of the first and the second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features. In the description of the present invention, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0022] The host (1) is an industrial computer, which can collect weak magnetic information detected by the weak magnetic signal sensor (2) in conjunction with the control program on it. The host (1) and the weak magnetic signal sensor (2) are connected by a signal line, and the signal line passes through the middle ventilation hole of the wall of the magnetic shielding room (9). The weak magnetic signal sensor (2) can collect and record the weak magnetic information generated by the movement of lithium ions driven by thermal turbulence in the lithium ion battery electrolyte (7), and establish a sensor measurement array with a high spatial resolution of less than 10mm. The fiber laser (3) is a single-mode fiber laser with a wavelength of 1550nm and a power of 150mW, which is used to generate a thermal turbulence effect in the lithium ion battery electrolyte (7) environment. The single-mode optical fiber (4) is connected to the fiber laser (3) through a flange, and the single-mode laser is introduced into the lithium ion battery electrolyte (7) through the ventilation hole on the wall of the magnetic shielding room (9). The optical fiber three-dimensional deflection table (5) is designed to be demagnetized and is made of high-strength polyetheretherketone material. It is used to clamp the single-mode optical fiber (4) and has the ability to move the clamped single-mode optical fiber (4) in the three directions of X, Y, and Z. The non-magnetic stage (6) is designed to be non-magnetic as a whole. The lithium-ion battery electrolyte (7) to be studied is dripped on it. The lithium-ion battery electrolyte (7) contains lithium-ion microspheres (10). The zero-magnetic microscope system (8) is an inverted microscopic observation system. After the zero-magnetic design, it can be used to observe and record the particle motion state inside the lithium-ion battery electrolyte (7) under the thermal turbulence state. The magnetic shielding room (9) is a hollow metal room built with seven layers of permalloy walls. The interior is a cubic space of 3m×3m×3m, and the remanence of the central area is less than 0.2nT.

Claims

1. A light-driven lithium battery internal associated magnetic information equivalent simulation device under weak magnetic environment, characterized in that: The invention comprises the following parts: a host (1), a weak magnetic signal sensor (2), a fiber laser (3), a single-mode optical fiber (4), a fiber optic three-dimensional deflection table (5), a non-magnetic stage (6), a lithium ion battery electrolyte (7), a zero-magnetic microscope system (8), and a magnetic shielding room (9). The host (1) is connected to the weak magnetic signal sensor (2) via a signal line; the weak magnetic signal sensor (2) transmits the collected signal to the host (1); the fiber laser (3) is connected to the single-mode optical fiber (4) via a flange; the fiber optic three-dimensional deflection table (5) is used to clamp the single-mode optical fiber (4); the lithium ion battery electrolyte (7) contains lithium ion microspheres (10) which are dropped on the non-magnetic stage (6); the zero-magnetic microscope system (8) is inverted below the non-magnetic stage (6); and the magnetic shielding room (9) provides a zero-magnetic environment for the whole.

2. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light under a weak magnetic environment as described in claim 1, it is characterized in that: The host (1) is an industrial computer and can collect weak magnetic information detected by the weak magnetic signal sensor (2) in cooperation with the control program thereon.

3. According to the device for simulating the internal associated magnetic information of a lithium battery driven by light under a weak magnetic environment as described in claim 2, it is characterized in that: The weak magnetic signal sensor (2) can realize weak magnetic information generated by the movement of lithium ions driven by thermal turbulence in the lithium ion battery electrolyte (7), and establish a sensor measurement array with a high spatial resolution of less than 10 mm.

4. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light under a weak magnetic environment as described in claim 1, it is characterized in that: The fiber laser (3) is a 1550nm single-mode fiber laser, and is used to generate a thermal turbulence effect in a lithium-ion battery electrolyte (7) environment.

5. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light under a weak magnetic environment as described in claim 1, it is characterized in that: The single-mode optical fiber (4) is connected to the optical fiber laser (3) via a flange, and the single-mode laser is introduced into the interior of the lithium-ion battery electrolyte (7) via a through hole on the wall of the magnetic shielding room (9).

6. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light in a weak magnetic environment as described in claim 1, it is characterized in that: The optical fiber three-dimensional deflection table (5) is used to clamp the single-mode optical fiber (4), and has the ability to move the clamped single-mode optical fiber (4) in three directions: X, Y, and Z.

7. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light under a weak magnetic environment as described in claim 1, it is characterized by: The non-magnetic stage (6) is designed to be non-magnetic as a whole, and a lithium-ion battery electrolyte (7) to be studied is dripped on it. The zero-magnetic microscope system (8) is an inverted microscope observation system, which can be used to observe and record the particle motion state inside the lithium-ion battery electrolyte (7) under thermal turbulence after the zero-magnetic design.

8. According to the device for simulating the equivalent magnetic information of the internal associated magnetic field of a lithium battery driven by light in a weak magnetic environment as described in claim 1, it is characterized by: The magnetic shielding room (9) is a hollow metal room built with seven layers of permalloy walls, the interior of which is a cubic space of 3m×3m×3m, and the remanent magnetism in the central area is less than 0.2nT.

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