Charging lithium battery basics 86 questions, worth collecting!

Charging lithium battery basics 86 questions, worth collecting!

1, what is the capacity of the battery of the lithium-ion battery? The capacity of the battery has a rated capacity and the actual capacity. The rated amount of the battery refers to the design and manufacture of a battery or to ensure that the battery should be lowered under certain discharge conditions..

Li-ION specifies that the battery is charged at normal temperature, constant current (1C) constant pressure (4.2V) control, and the actual capacity of the battery refers to the actual power of the battery in a certain discharge condition, important discharge ratio. And the effect of temperature (so strict, battery capacity should refer to the changing charge conditions).

Common units of capacity are: mah, AH = 1000mAh). 2, what is the battery internal resistance? Refers to the resistance of the battery when the battery is flowing through the battery inside the battery..

Emoenthesis and polarized internal resistance two parts. The battery is blocked, which causes the battery discharge operating voltage to decrease, and the discharge time is shortened..

Internal resistance is important to be affected by the materials of the battery, manufacturing process, battery structure and other factors. Is an important parameter measuring battery performance. Note: Generally, the charge is critracted in the charge state.

. Measuring the internal resistance of the battery requires a special internal resistance meter, and can not measure the eminite. 3, what is open circuit voltage? Refers to the battery’s positive and negative electrical pole when the battery is automatically flowing in a non-working state.

. In general, Li-ION is filled with electricity, the open circuit voltage is about 4.1-4.

2V, and the pressurization is 3.0V is 3.0V, and the electricity state of the battery can be judged by the opening voltage of the battery.

. 4, what is a working voltage? Also known as an end voltage, refers to the potential difference between the battery positive and negative electrical poles in the circuit under the working state..

In the battery discharge operation, when the current flows inside the battery, the working voltage is always lower than the opening battery without overcoming the internal resistance of the battery.. LI-ION’s discharge operating voltage is around 3.

6V. 5, what is the discharge platform? The discharge platform is constant to charge the voltage of 4.2V and the electric current is less than 0.

01c, and then put on hold for 10 minutes, discharged at the discharge current of any rate to 3.6V. Discharge time.

It is an important criterion for measuring the quality of the battery.. 6, what is the (charge and discharge) multiplier time? Refers to the current value of the battery to present the rated capacity in the specified time, which is equal to the multiplication of the battery rated capacity on the data value, usually in letter C.

If the nominal rated capacity of the battery is 600mAh is 1C (1 magnification), 300mAh is 0.5c, 6a (600 mAh) is 10c. With this, the time rate is also known as the hour, and when the battery is put on a certain current.

The number of hours required for the rated capacity. If the rated capacity of the battery is 600mAh, the rated capacity is 1 hour with a current of 600 mAh, so that the current of 600mAh is 1 hour, in such a push. 7, what is the self-discharge rate? Also known as the power retention capacity refers to the capacity of the battery stored in the battery in the open circuit.

. Important is affected by factors such as battery manufacturing processes, materials, storage conditions. Is an important parameter that measures battery performance.

Note: After the battery is 100% charging open circuit, a certain degree of self-illumination is normal.. After the GB standard specifies that Li-ION is opened under 20 ± 2 ° C for 28 days.

. Can allow battery capacity loss. 8, what is internal pressure? Refers to the internal air pressure of the battery, which is caused by a gas that occurs during charge and discharge.

It is important to be affected by battery materials, manufacturing processes, battery structures.. Its cause is important because the gas in the battery is moisture and the organic solution decomposes the gas in the battery.

. The sustained charge of high-magnification can cause the battery temperature, increased internal pressure, and the performance of the battery and the appearance of the battery are destructive, such as leakage, drum bottom, battery internal resistance, discharge time and cycle life Be short-term. Any form of li-ion will lead to serious damage, and even exploding.

Helping Li-ION to use constant current constant pressure charge during charging, prevent excessive charge for the battery. 9. Why is the battery to store for a period of time to pack shipments? The storage performance of the battery is an important parameter that measures the level of comprehensive performance of the battery.

. After a battery is stored, the capacity of the battery is allowed to change to a certain degree of change..

After a period of storage, the electrochemical performance of the internal components can be stabilized, you can understand the size of the self-discharge performance of the battery to ensure the quality of the battery.. 10.

Why is it necessary to become a battery manufacturing, a process of activating its internal positive and negative electrode substance, improves the charging and discharge performance of the battery and self-disculating and discharge performance and self-discharge, storage, etc., and the battery powder is chemically Before you can reflect true performance. 11.

What is a partial capacity? During the manufacturing process, the actual capacity of the battery cannot be completely consistent due to process reasons, and the battery is detected by a certain charge and discharge system, and the battery according to the capacity classification is called the separation.. 12.

What is a pressure drop? The battery is charged to more than 80% of the battery, and it is measured to measure its battery no-load voltage.. 5W / 2W battery is used as a load-connected battery positive and negative extreme switch as a broken circuit of the battery, and the means of the passage is connected in series.

. 5 seconds after opening the switch, the voltage drop is not greater than 0. 4V, qualified for test battery load performance.

13. What is a static resistance? That is, the battery internal resistance is 14. What is a dynamic resistance? That is, the battery internal resistance when charging.

15. What is the load capacity of the battery? When the positive and negative electrode of the battery is connected to the electrical appliance, the output power when the electric appliance is powered, that is, the load capacity of the battery..

16, what is charging efficiency? What is discharge efficiency? Charging efficiency means a measure of chemical energy that the battery consumes in the charging process into battery energy savings. Important is affected by battery technology, formula and battery operating ambient temperature, the higher the normal ambient temperature, the charging efficiency should be low. Discharge efficiency refers to the ratio of actual power and rated capacity discharged to the endpoint voltage under certain discharge conditions.

Important discharge ratio, ambient temperature, internal resistance, etc., in general, the higher the discharge magnification, then discharge The lower the efficiency. The lower the temperature, the lower the discharge efficiency.

17. What is the difference between the common rechargeable batteries? Current nickel-cadmium, nickel-hydrogen, and lithium-ion rechargeable batteries are widely used in a variety of portable electrical equipment (such as laptops, cameras, mobile phones, etc.).

A rechargeable battery is self-unique chemistry. The important difference between nickel-cadmium and nickel-hydrogen batteries is that the energy density of nickel-hydrogen battery is relatively high..

Compared with the same model, the nickel-hydrogen battery capacity is twice the nickel-cadmium battery.. This means that the use of NiM hydrogen batteries can greatly extend equipment working hours without adding additional weight of electrical equipment.

. The other advantage of nickel-hydrogen batteries is that a greatly reduces the presence of cadmium batteries: “memory effect” problem, so that the nickel-hydrogen battery can be used more conveniently..

NiMH batteries are more environmentally friendly than nickel-cadmium batteries because there is no toxic weight metal elements inside.. Li-ION has quickly become standard power supplies for portable devices, Li-ION can supply the same energy as the nickel-hydrogen battery, but can reduce approximately 35% in weight, which is about 35%, electricity equipment such as the radiopes and laptops.

It is crucial. Li-Ion does not have a “memory effect” and the advantages of no toxic substances are also important factors for making it a standard power supply..

18. What is the “green battery” currently in use and research? The new green environmental protection battery refers to a class of high-performance, non-pollutable batteries that have been put into use or developed in recent years..

The lithium ion battery, metal hydride nickel battery, which has been used in a large number of lithium-free alkaline zinc manganese batteries and lithium or lithium ion plastic storage batteries that are developing and developed, and the battery, and electrochemical energy storage supercapacitors belong to the new type. Green environmental battery category. In addition, solar cells that have been widely used in photoelectric conversion using solar energy.

19, what battery will dominate the battery market? With the camera, mobile and cordless phones, laptops, with images, multimedia equipment that occupy the sounds in household appliances, more and more important positions, compared with primary batteries, secondary batteries That is, the rechargeable battery is also applied to these fields.. The secondary rechargeable battery will be developed in a small size, light weight, capacity, intelligent direction.

. 20, what is a lithium ion battery? Refers to a charging battery according to a lithium ion as a reaction active material. When the battery is discharged to the termination voltage, it can be recharged to restore the state before discharge.

. 21. Working principle of a lithium ion battery When discharges, lithium in lithium and carbon is dissolved from the negative electrode to form a lithium ion to the electrolyte, and the electrolyte is embedded and embedded in the positive electrode crystal.

The lithium ions embedded in the positive electrode are returned to the electrolyte, and then embedded in the negative electrode and carbon formation, the cycle is started. 22, lithium ion battery and nickel / cadmium, nickel / hydrogen, lead-acid battery compared to the advantage? High energy, low discharge rate, good high and low temperature, long charge and discharge. 23.

What is the average voltage of the battery? When the battery is discharged, the voltage average when the start to the discharge is terminated.. 24.

What is the energy density of the battery? Refers to the electrical energy contained in the unit volume of the battery.. 25.

What is the capacity of the battery? Refers to the electrical energy of the active material in the battery to participate in electrochemical reactions to the capacity of the battery. 26, what is the design capacity of the battery? According to the amount of active substance contained in the battery, the capacity of the battery is called the design capacity..

27, what is the battery rated capacity? Refers to the battery process, the battery can reach the capacity of the battery is called the rated capacity.. 28 Relationship.

30. What is the hourly rate of the battery? The number of hours required to put the rated capacity according to a certain output current is called the discharge time rate..

31. The lithium ion battery consists of those raw materials, a positive active material, an anode active material, a collecting piece, a diaphragm, an electrolyte, and a housing..

32. The characteristics of the lithium-ion battery model and the battery are related to the outer shape, wide, high and battery capacity. 33.

What is the two most important factors affecting the cycle of lithium ion batteries? The nature and impurities of active substances, content. 34. How to control the moisture inside the battery during the production process? 1 Workless to prevent moisture, moisture-proof treatment.

2 shorten the operation time, reduce the exposure time in the air. 3 rationally correctly carry out baking homework. 4 Try to work in a dry environment.

35. What is the active positive material of the lithium ion battery? Lithium salt; such as lithium cobaltate, lithium manganate, lithium nickellate, etc..

36. What is the active negative electrode material of a lithium-ion battery? Grill powder 37, the electrode material does the electrode material add to a conductive agent? When the battery is operating, the active material of the battery will not dissolve in the electrolyte regardless of the charge and discharge, in order to enhance the active substance and Net grid, collective electrical conductivity, and discharge conductivity. 38.

What is the composition of the electrolyte of the lithium ion battery? It is commonly used for lithium hexafluorophosphate, lithium tetrafluorophosphate (LiPF6, Liclo4), etc.. 39.

What is the purpose of ingredients? Make the active substances uniform, easy to pull the pulp, and the amount of the upper paste is constant. 40. Please briefly describe the process flow of ingredients.

. 41, three basic parameters of positive, negative electrode pulp. Pulp temperature, speed, dressing.

42. How to control the amount of dressing of the pole piece? According to the solid content of the positive and negative slurry, the proportion of the pulp machine head tool clearance is adjusted, and the thickness of the pulp is controlled to achieve control..

43. How to determine the quality of the polarity during the pulley. The surface is flat, smooth, the dressing is uniform, good adhesion, dry, no deprive, no fits, disadvantage, no dust, no scratches, no bubbles, a polar, defective Bad pole.

44. Important equipment for positive and negative tabs. 铡 paper knife, shearing machine.

45. Important precautions for positive and negative. 1 Check the safety of the knife, not flat, pay attention to the safety of the knife during homework.

2 positive and negative tabs can not be mixed with a knife. 3 Check the quality of the pole during the cutting process, separate the unqualified spacer, can not be confused. 4 After cutting the film, it will be transferred in the future.

. 46. ​​What is the purpose of positive, negative pole baking? Remove the moisture and organic solvent.

47, positive, negative electrode tablets for the purpose of contacting the active material and grid and the current tabs, reducing the moving distance of electrons, reducing the thickness of the pole, newly adding filling, and improves the utilization of battery volume. Thereby increasing the capacity of the battery. 48.

What is the impact on the cell performance? When the thickness of the tablets is too thick, it is easy to reduce the quality of the active activity in the battery, the decrease in the quality of the active activity of the unit volume and the increase of polarization potential, thereby causing the capacity of the battery to reduce the capacity of the battery.. When the thickness of the tablets is too thin, it is easy to cause the quality of the active activity in the battery, and the effective area of ​​the surface surface is reduced, thereby causing waste of the active material and the difficulty of high current.

. 49. What is the purpose of the heighing? Accurately understand and master the amount of dressing.

50. What is the purpose of the sheet?. 51, why do you want to brush? Clear dust, exotic, glitch, etc.

. 52. What kind of ears are used by the positive electrode?.

53, what is the eating of the negative electrode?. 54. Equipment for welding extremes? Positive ultrasonic welder, negative electrode spot welding machine.

55. What is the impact of the humidity between the winding burst? When the humidity in the winding house is large, the water absorption of the pole is large, and the moisture content is added, and the amount of gas is added in the battery, so that the battery New internal pressure, hazarding battery safety. New increase in water consumption of live materials in batteries to reduce battery capacity.

Small and RESODS 56. 57. Whether the windshore is wiped by water? Cannot 58, the important considerations of winding the battery core? 1 polar and diaphragm paper.

When you hold the pole and diaphragm paper with your hand, you will be moderately uniform.. Battery core rolls properly.

2 Note that there is no scratch, foam, absence, pores, bubbles, etc., and have no bad paper, if there is a waste treatment. 3 When you are winding, pay attention to the harmonic adjustability of your hands and feet, not being scratched by the needle.

. 59. The purpose and location of the battery core sticker paper? The position of the battery core sticker is not deformed after the battery is wound.

Bottom adhesive paper prevents the bottom of the positive electrode on the battery and the battery case to contact the battery. Side stickers allow the electrical core to wrap the formation is not deformed. Bottom adhesive paper prevents the bottom of the positive electrode on the battery and battery housing to contact the battery short circuit.

60. Adopting extorted tip welding to the cover using those equipment? Ultrasonic, the welder. 61.

Battery core resistance requirements? More than 20mΩ 62, how to do the electrical resistance of the battery core does not require it? Rework 63, why do you have to stick your tape? New firmness and prevent short circuits. 64. Before using the battery cover, do you test? Size, shape, thickness, insulation, sealing, corrosion resistance, material, etc.

. 65. How much is the maximum pressure that the battery cover can afford? 0.

4MPa66, how to prevent battery leakage? Prevent battery leakage should be done in the following aspects: 1 When welding battery housing and cap, it should be welded firmly, sealed, Welding without leakage, solder, weld without crack, crack, etc.. 2 When the steel ball is sealed, the steel ball is appropriate, the steel ball material and the cap material are the same.

. Welding free, crack and welding firm. 3 Caps of the cap are close, no gap, and the insulating seal is flexible, corrosion resistant, not easy to aging.

67. How to prevent unsealed batteries from absorbing water in the workshop under the existing conditions? 1 Working battery should be many times. Shorten battery exposure time in air.

2 The battery has been transferred in time to the next step. Try to shorten the stagnation time of the battery in the process. 68.

The humidity requirements for drying rooms? Relative humidity is below 6%. 69. What effect does the humidity of the drying room affect the performance of the battery? Humidity adds to increase the water absorption of the battery core, so that the capacity of the battery is lowered, and the internal pressure is added.

. 70, how to try to prevent moisture from entering the dry room? Less random, open the door, the door of the dry room can not open at the same time. 71.

Do you think dry room can wipe the floor with water?. 72. Before the battery should do those treatment? Glue and vacuum baking treatment.

73. Why should the battery have vacuum baking before the liquid? Try to remove the moistures and solvents included in the battery..

74. Why is the battery weigh before the liquid? In order to accurately calculate the amount of liquidation. 75.

Battery fluid method? Nething operation with manual injection machine or automatic tissue machine. 76. How to verify whether the battery is filled with electrolyte? With vacuum suction test, in vacuo, the electrolyte is smoked, and there is no expiration of 77, the use of Liof6 in the electrolyte? Conductive electrolyte.

78. The concentration of LiPF6 in the electrolyte? 1 mol / l79, use of solvent in an electrolyte? Dissolve electrolyte to make electrolyte ionization. 80.

Electrolytic fluid conductivity range? 8 × 10-3Ω-181, electrical conductivity affects battery operating current? The conductivity affects the magnification discharge rate, and the internal resistance of the battery, and the voltage of the battery.. 82.

The internal resistance of the battery affects those factors? The electrical conductivity of the electrolyte, the properties of the battery of the battery, the electrical conductivity of the pole, and the cross-sectional area of ​​the extreme ear material. Battery welding quality. 83.

The capacity of the battery is affected by those factors. The characteristics of the positive and negative electrode materials and the type, model and active substance of the material..

Correct proportion of positive and negative active substances. Concentration and species of electrolyte. Production process.

84. How do you think how to control the moisture in the battery in the battery life? Strictly control the humidity of the environment in the production process and the hydrothermal hydraulic hydraulic battery. 85.

Can the battery measuring the resistor when charging? Can 86, what should I pay attention to when chemical into a large-capacity battery? Pay attention to whether the total power of the battery exceeds the power of the chemical machine. .

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