Method for improving energy density of single battery cell based on energy storage system

Abstract

The invention relates to the technical field of energy storage, in particular to a method for improving the energy density of a single cell based on an energy storage system, and the method comprises the following steps: selecting and developing a high-energy-density battery material, and designing and manufacturing an electrode; the electrolyte and the diaphragm are optimized; designing a battery structure, and designing a thermal management system; establishing a battery management system; and testing and verifying to verify the performance and safety of the battery. By improving the material, the structure and the design of the battery, the energy density of the single battery cell can be remarkably improved, so that the battery can store more energy under the same volume or mass, the volume and the weight of the battery can be reduced by improving the energy density of the single battery cell, and the cycle life and the stability of the battery can be improved by optimizing the design and the material of the battery; and aging and performance degradation are reduced, so that the requirement of frequently replacing the battery is reduced, and the total cost of ownership is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage technology, and specifically is a method for improving the energy density of a single battery cell based on an energy storage system. Background Art

[0002] Energy storage systems are systems used to store electrical energy for release when needed. They can balance electricity supply and demand, improve grid stability, or provide backup power for equipment. Common energy storage technologies include: battery energy storage, such as lithium-ion batteries, lead-acid batteries, solid-state batteries, etc.; pumped storage, which stores energy by pumping water to a high place and releases it when needed; flywheel energy storage, which stores kinetic energy by rotating flywheels and releases it when needed; supercapacitors, which quickly store and release electrical energy, suitable for high power requirements in a short period of time; compressed air energy storage, which uses compressed air to store energy and drives a generator when released. Existing energy storage systems have high initial investment and maintenance costs, energy density limitations, and limited service life of energy storage devices such as batteries, which need to be replaced regularly. There is energy loss during the energy conversion process, which reduces the overall efficiency. The battery system may have overheating, short circuits or other safety hazards, resulting in low safety. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for improving the energy density of a single cell based on an energy storage system to solve the above technical problems.

[0004] To achieve the above object, the present invention provides the following technical solutions: Methods for improving the energy density of single cells based on energy storage systems include: Select and develop high energy density battery materials, design and manufacture electrodes; Optimize electrolyte and separator; Design battery structure and thermal management system; Establishing a battery management system; Conduct testing and verification to verify the performance and safety of the battery.

[0005] Preferably, the specific steps of selecting and developing high energy density battery materials, designing and manufacturing electrodes include: Research on high energy density materials currently on the market, including high capacity positive electrode materials, negative electrode materials and The properties of the dissolved material; Synthesize and test new materials in the laboratory and optimize the materials; The optimization process includes: Select vapor deposition synthesis method for synthesis, adjust synthesis temperature, time and reaction atmosphere parameters; change the chemical composition of active materials, test the effect of different doping elements, add conductive agents and modify Additives, using cyclic voltammetry to test the electrochemical reaction kinetics of the material; Use constant current charge and discharge tests to evaluate the actual capacity and efficiency of the material, use AC impedance spectroscopy to analyze the conductivity and interface resistance of the material, and use characterization techniques and chemical analysis to detect the composition of the material; Introducing doping elements to improve the electrochemical properties of materials; Coating a protective layer on the surface of the material and improving the crystal structure and electrochemical properties of the material through high-temperature annealing; The material is ball milled to adjust its particle size and distribution.

[0006] Preferably, the desired battery capacity and energy density are set and the electrode thickness is selected; Design the surface area of ​​the electrode; Use computer-aided design software to create the electrode's geometric model, including thickness, area, and shape; Use electrochemical simulation tools to simulate the current distribution, electrochemical reactions and ion transport of electrodes and optimize design parameters; Prepare materials, evenly coat the slurry on a conductive substrate, and calender the coated electrode material; Baking the coated and calendered electrode to solidify the material and remove the solvent; Adjust the electrode geometry based on simulation results; Optimize the spacing and arrangement order between electrodes, and design the electrode spacing and current collector layout; Test the performance of the electrode, adjust the electrode design and manufacturing process based on the test results, and perform iterative optimization.

[0007] Preferably, the specific steps of optimizing the electrolyte and the separator include: Select high-concentration liquid electrolytes and optimize the concentration and composition of the electrolyte solution; Use a conductivity tester to measure the ionic conductivity of the electrolyte and evaluate the stability of the electrolyte under high temperature, high voltage and long-term use; Select high stability diaphragm material, design porosity and diaphragm thickness; The diaphragm is prepared by a solution impregnation manufacturing process; Carry out surface modification and conduct performance test on the battery; Analyze the test results, evaluate the compatibility and overall performance of the electrolyte, separator and electrode materials, and optimize based on the test results.

[0008] Preferably, the battery performance test includes: Measuring the mechanical strength and puncture resistance of the diaphragm; Ionic conductivity test and chemical stability test; assembling the selected electrolyte, separator and electrode materials into a battery cell; Testing the corrosiveness and reactivity of electrolytes to electrode materials; Test battery cycle life and capacity retention; Conduct safety tests on overcharge, short circuit and thermal runaway to detect the safety of batteries under extreme conditions; Evaluate the energy density, power density and charge and discharge efficiency of batteries; The evaluation formula is: , In the formula, C is the battery capacity, V is the battery voltage, m is the battery mass, and E is the energy density; Optimize based on the evaluation results; The optimization formula is: , In the formula, To optimize the output value, For the optimized capacity, Add value to voltage.

[0009] Preferably, the specific steps of designing the battery structure and the thermal management system include: The battery is packaged using thin packaging materials; Select packaging materials with excellent chemical corrosion resistance and temperature resistance; Add heat dissipation design to the package; Ensure accurate docking of battery components; Implement quality control during assembly to detect and repair structural defects; Ensure the reliability of insulation and contact parts to avoid short circuit and leakage problems.

[0010] Preferably, a thermal management system is designed, including a heat sink, a thermally conductive material, and a cooling device; Select high thermal conductivity materials for thermal management systems; Integrate the thermal management system with the battery structure.

[0011] Preferably, the specific steps of establishing a battery management system include: Design battery management system, including voltage, current, temperature monitoring and balanced charging functions; Establish dynamic battery charging and discharging model; Verify the effectiveness of battery status monitoring, charging and discharging strategies, and protection functions; Integrate the BMS system into the battery and perform testing and calibration to ensure its compatibility with the battery.

[0012] Preferably, the dynamic battery charging and discharging model formula is: , Where t is the current time step, T is the total time step, The charging cost at time t, is the charging efficiency at time t, The discharge cost at time t, is the discharge efficiency at time t, is the weight coefficient, Energy cost at time t.

[0013] Preferably, the specific steps of testing and verifying the performance and safety of the battery include: Perform charge and discharge cycles to measure the charge and discharge capacity of the battery; Test the performance of the battery under different temperature environments; Simulate short-circuit conditions and measure the battery's response; Charge the battery beyond its maximum charge voltage and monitor the battery response; Discharge the battery below its minimum termination voltage and monitor the battery behavior; Record detailed data of all tests including voltage, current, temperature and status.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By improving battery materials, structure and design, the present application can significantly improve the energy density of single cells, so that more energy can be stored in the same volume or mass. Improving the energy density of single cells can reduce the volume and weight of the battery. Optimizing battery design and materials can improve the cycle life and stability of the battery, reduce aging and performance degradation, and thus reduce the need for frequent battery replacement. Improving battery design and materials can reduce overheating, short circuit and other potential safety risks, and improve the overall safety of the battery. Through more efficient battery design and materials, the battery charging and discharging efficiency can be improved, energy loss can be reduced, and the overall energy efficiency of the system can be improved. Improving battery energy density can reduce the frequency of battery replacement and maintenance costs, thereby reducing the total cost of ownership. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a step flow framework diagram of the present invention. DETAILED DESCRIPTION

[0016] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0017] In the accompanying drawings, the size, dimensions and shapes of the elements have been slightly adjusted for ease of illustration. The drawings are for illustration only and are not strictly drawn to scale. As used herein, the terms "substantially", "approximately" and similar terms are used as terms of approximation, not as terms of degree, and are intended to illustrate the inherent deviations in measurements or calculations that would be recognized by a person of ordinary skill in the art. In addition, in this application, the order in which the processing of each step is described does not necessarily represent the order in which these processes occur in actual operation, unless otherwise specified or can be derived from the context.

[0018] It should also be understood that expressions such as "include", "including", "have", "contain" and / or "comprising" are open rather than closed expressions in this specification, which indicate the presence of the stated features, elements and / or components, but do not exclude the presence of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than just the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0019] Unless otherwise defined, all words (including engineering terms and technical terms) used in this article have the same meaning as commonly understood by ordinary technical citizens in the field to which this application belongs. It should also be understood that, unless otherwise clearly stated in this application, words defined in commonly used dictionaries should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense.

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] The present invention provides a technical solution: A method for improving the energy density of a single cell based on an energy storage system, characterized in that the method for improving the energy density of a single cell includes: Select and develop high energy density battery materials, design and manufacture electrodes; Optimize electrolyte and separator; Design battery structure and thermal management system; Establishing a battery management system; Conduct testing and verification to verify the performance and safety of the battery.

[0022] Further, the specific steps for selecting and developing high energy density battery materials, designing and manufacturing electrodes include: Research on high energy density materials currently on the market, including high capacity positive electrode materials, negative electrode materials and The properties of the dissolved material; Synthesize and test new materials in the laboratory and optimize the materials; The optimization process includes: Select vapor deposition synthesis method for synthesis, adjust synthesis temperature, time and reaction atmosphere parameters; change the chemical composition of active materials, test the effect of different doping elements, add conductive agents and modify Additives, using cyclic voltammetry to test the electrochemical reaction kinetics of the material; Use constant current charge and discharge tests to evaluate the actual capacity and efficiency of the material, use AC impedance spectroscopy to analyze the conductivity and interface resistance of the material, and use characterization techniques and chemical analysis to detect the composition of the material; Introducing doping elements to improve the electrochemical properties of materials; Coating a protective layer on the surface of the material and improving the crystal structure and electrochemical properties of the material through high-temperature annealing; The material is ball milled to adjust its particle size and distribution.

[0023] Further, the required battery capacity and energy density are set and the electrode thickness is selected; Design the surface area of ​​the electrode; Use computer-aided design software to create the electrode's geometric model, including thickness, area, and shape; Use electrochemical simulation tools to simulate the current distribution, electrochemical reactions and ion transport of electrodes and optimize design parameters; Prepare materials, evenly coat the slurry on a conductive substrate, and calender the coated electrode material; Baking the coated and calendered electrode to solidify the material and remove the solvent; Adjust the electrode geometry based on simulation results; Optimize the spacing and arrangement order between electrodes, and design the electrode spacing and current collector layout; Test the performance of the electrode, adjust the electrode design and manufacturing process based on the test results, and perform iterative optimization.

[0024] Further, the specific steps for optimizing the electrolyte and the separator include: Select high-concentration liquid electrolytes and optimize the concentration and composition of the electrolyte solution; Use a conductivity tester to measure the ionic conductivity of the electrolyte and evaluate the stability of the electrolyte under high temperature, high voltage and long-term use; Select high stability diaphragm material, design porosity and diaphragm thickness; The diaphragm is prepared by a solution impregnation manufacturing process; Carry out surface modification and conduct performance test on the battery; Analyze the test results, evaluate the compatibility and overall performance of the electrolyte, separator and electrode materials, and optimize based on the test results.

[0025] Furthermore, the battery performance test includes: Measuring the mechanical strength and puncture resistance of the diaphragm; Ionic conductivity test and chemical stability test; assembling the selected electrolyte, separator and electrode materials into a battery cell; Testing the corrosiveness and reactivity of electrolytes to electrode materials; Test battery cycle life and capacity retention; Conduct safety tests on overcharge, short circuit and thermal runaway to detect the safety of batteries under extreme conditions; Evaluate the energy density, power density and charge and discharge efficiency of batteries; The evaluation formula is: , In the formula, C is the battery capacity, V is the battery voltage, m is the battery mass, and E is the energy density; Optimize based on the evaluation results; The optimization formula is: , In the formula, To optimize the output value, For the optimized capacity, Add value to voltage.

[0026] Furthermore, the specific steps of designing the battery structure and the thermal management system include: The battery is packaged using thin packaging materials; Select packaging materials with excellent chemical corrosion resistance and temperature resistance; Add heat dissipation design to the package; Ensure accurate docking of battery components; Implement quality control during assembly to detect and repair structural defects; Ensure the reliability of insulation and contact parts to avoid short circuit and leakage problems.

[0027] Furthermore, a thermal management system is designed, including a heat sink, thermal conductive materials, and cooling devices; Select high thermal conductivity materials for thermal management systems; Integrate the thermal management system with the battery structure.

[0028] Furthermore, the specific steps of establishing a battery management system include: Design battery management system, including voltage, current, temperature monitoring and balanced charging functions; Establish dynamic battery charging and discharging model; Verify the effectiveness of battery status monitoring, charging and discharging strategies, and protection functions; Integrate the BMS system into the battery and perform testing and calibration to ensure its compatibility with the battery.

[0029] Furthermore, the dynamic battery charging and discharging model formula is: , Where t is the current time step, T is the total time step, The charging cost at time t, is the charging efficiency at time t, The discharge cost at time t, is the discharge efficiency at time t, is the weight coefficient, Energy cost at time t.

[0030] Further, the specific steps for testing and verification to verify the performance and safety of the battery include: Perform charge and discharge cycles to measure the charge and discharge capacity of the battery; Test the performance of the battery under different temperature environments; Simulate short-circuit conditions and measure the battery's response; Charge the battery beyond its maximum charge voltage and monitor the battery response; Discharge the battery below its minimum termination voltage and monitor the battery behavior; Record detailed data of all tests including voltage, current, temperature and status.

[0031] The advantages of the present invention are: Improve the energy density of single cells so that they can store more energy in the same volume or mass, and reduce the volume and weight of the battery; Optimizing battery design and materials improves battery cycle life and stability, reduces aging and performance degradation, and thus reduces the need for frequent battery replacement; Improving battery design and materials can reduce overheating, short circuits and other potential safety risks, improve the overall safety of the battery, and through more efficient battery design and materials, improve the battery's charging and discharging efficiency, reduce energy loss, and improve the overall energy efficiency of the system; Reduces battery replacement frequency and maintenance costs, thereby lowering total cost of ownership.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for improving the energy density of a single cell based on an energy storage system, characterized in that: Methods to increase the energy density of single cells include: Select and develop high energy density battery materials, design and manufacture electrodes; Optimize electrolyte and separator; Design battery structure and thermal management system; Establishing a battery management system; Conduct testing and verification to verify the performance and safety of the battery.

2. The method for increasing the energy density of a single cell based on an energy storage system according to claim 1, characterized in that: The specific steps for selecting and developing high energy density battery materials, designing and manufacturing electrodes include: Research on high energy density materials currently on the market, including high capacity positive electrode materials, negative electrode materials and The properties of the dissolved material; Synthesize and test new materials in the laboratory and optimize the materials; The optimization process includes: Select vapor deposition synthesis method for synthesis, adjust synthesis temperature, time and reaction atmosphere parameters; change the chemical composition of active materials, test the effect of different doping elements, add conductive agents and modify Additives, using cyclic voltammetry to test the electrochemical reaction kinetics of the material; Use constant current charge and discharge tests to evaluate the actual capacity and efficiency of the material, use AC impedance spectroscopy to analyze the conductivity and interface resistance of the material, and use characterization techniques and chemical analysis to detect the composition of the material; Introducing doping elements to improve the electrochemical properties of materials; Coating a protective layer on the surface of the material and improving the crystal structure and electrochemical properties of the material through high-temperature annealing; The material is ball milled to adjust its particle size and distribution.

3. The method for improving the energy density of a single cell based on an energy storage system according to claim 2, wherein Features include: Set the required battery capacity and energy density, and select the electrode thickness; Design the surface area of ​​the electrode; Use computer-aided design software to create the electrode's geometric model, including thickness, area, and shape; Use electrochemical simulation tools to simulate the current distribution, electrochemical reactions and ion transport of electrodes and optimize design parameters; Prepare materials, evenly coat the slurry on a conductive substrate, and calender the coated electrode material; Baking the coated and calendered electrode to solidify the material and remove the solvent; Adjust the electrode geometry based on simulation results; Optimize the spacing and arrangement order between electrodes, and design the electrode spacing and current collector layout; Test the performance of the electrode, adjust the electrode design and manufacturing process based on the test results, and perform iterative optimization.

4. The method for increasing the energy density of a single cell based on an energy storage system according to claim 3, characterized in that: The specific steps to optimize the electrolyte and separator include: Select high-concentration liquid electrolytes and optimize the concentration and composition of the electrolyte solution; Use a conductivity tester to measure the ionic conductivity of the electrolyte and evaluate the stability of the electrolyte under high temperature, high voltage and long-term use; Select high stability diaphragm material, design porosity and diaphragm thickness; The diaphragm is prepared by a solution impregnation manufacturing process; Carry out surface modification and conduct performance test on the battery; Analyze the test results, evaluate the compatibility and overall performance of the electrolyte, separator and electrode materials, and optimize based on the test results.

5. The method for increasing the energy density of a single cell based on an energy storage system according to claim 1, characterized in that: The battery performance test includes: Measuring the mechanical strength and puncture resistance of the diaphragm; Ionic conductivity test and chemical stability test; assembling the selected electrolyte, separator and electrode materials into a battery cell; Testing the corrosiveness and reactivity of electrolytes to electrode materials; Test battery cycle life and capacity retention; Conduct safety tests on overcharge, short circuit and thermal runaway to detect the safety of batteries under extreme conditions; Evaluate the energy density, power density and charge and discharge efficiency of batteries; The evaluation formula is: ， In the formula, C is the battery capacity, V is the battery voltage, m is the battery mass, and E is the energy density; Optimize based on the evaluation results; The optimization formula is: ， In the formula, To optimize the output value, For the optimized capacity, Add value to voltage.

6. The method for increasing the energy density of a single cell based on an energy storage system according to claim 5, characterized in that: The specific steps for designing the battery structure and thermal management system include: The battery is packaged using thin packaging materials; Select packaging materials with excellent chemical corrosion resistance and temperature resistance; Add heat dissipation design to the package; Ensure accurate docking of battery components; Implement quality control during assembly to detect and repair structural defects; Ensure the reliability of insulation and contact parts to avoid short circuit and leakage problems.

7. The method for increasing the energy density of a single cell based on an energy storage system according to claim 6, characterized in that: Design thermal management systems, including heat sinks, thermally conductive materials, and cooling devices; Select high thermal conductivity materials for thermal management systems; Integrate the thermal management system with the battery structure.

8. The method for increasing the energy density of a single cell based on an energy storage system according to claim 1, characterized in that: The specific steps to establish a battery management system include: Design battery management system, including voltage, current, temperature monitoring and balanced charging functions; Establish dynamic battery charging and discharging model; Verify the effectiveness of battery status monitoring, charging and discharging strategies, and protection functions; Integrate the BMS system into the battery and perform testing and calibration to ensure its compatibility with the battery.

9. The method for increasing the energy density of a single cell based on an energy storage system according to claim 1, characterized in that: in, The dynamic battery charge and discharge model formula is: ， Where t is the current time step, T is the total time step, The charging cost at time t, is the charging efficiency at time t, The discharge cost at time t, is the discharge efficiency at time t, is the weight coefficient, Energy cost at time t.

10. The method for increasing the energy density of a single cell based on an energy storage system according to claim 1, characterized in that: The specific steps for testing and verifying the performance and safety of the battery include: Perform charge and discharge cycles to measure the charge and discharge capacity of the battery; Test the performance of the battery under different temperature environments; Simulate short-circuit conditions and measure the battery's response; Charge the battery beyond its maximum charge voltage and monitor the battery response; Discharge the battery below its minimum termination voltage and monitor the battery behavior; Record detailed data of all tests including voltage, current, temperature and status.

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