18650 battery 3.7v 2200mah

　　What are the technical parameters of 18650 battery 3.7v 2200mah?

　　Eight main parameters of 18650 battery 3.7v 2200mah:

　　1. Capacity

　　Everyone is paying attention to this main parameter. It has become popular. When we use smartphones, the biggest worry is that the battery is insufficient. We need to charge frequently, and sometimes we can’t find a place to charge. In the early days of use and normal use, the fully charged battery can be powered off for 3 to 5 days, and some products can even be powered off for more than 7 days. However, in the era of smart machines, battery life looks terrible. One of the important reasons is that the power consumption of mobile phones continues to increase, but the capacity of batteries has not increased at the same proportion.

　　The unit of capacitance is generally "mAh" (milliamp) or "Ah" (ampere-hour). In application, it is divided into short-circuit capacity and specific volume. Short-circuit capacity refers to the total power consumption that a fully charged lithium battery can provide when it is charged and discharged to the cut-off voltage at a specific charge-discharge rate (C-rate) under laboratory conditions (ideal temperature and humidity environment). Under normal circumstances, the actual capacitor is not equal to the rated capacitor, which is directly related to temperature, humidity, battery charging rate, etc. Generally speaking, the actual capacitor is slightly smaller than the rated capacitor, sometimes even smaller than the rated capacitor. For example, in the winter in northern China, if the mobile phone is used outdoors, the battery power will decrease rapidly.

　　2. Energy density

　　A rechargeable battery that can store and release electric energy per unit volume or unit weight. It has two types: Wh/kg and Wh/L, which respectively represent the weight energy density and volumetric energy density. This power consumption is the integral of the volume (Ah) and the working standard voltage (V). The index value of specific energy is more guiding than volume when used.

　　With current lithium battery technology, the specific energy level that can be achieved is about 100~200Wh/kg. This value is still low and has become a shortcoming of the use of 18650 battery 3.7v 2200mah in many places. The same problem also occurs in the pure electric vehicle industry, because the specific energy of the battery is strictly limited in terms of volume and weight, forcing pure electric vehicles to reach the maximum mileage at a time, so there is "mileage anxiety". "Emotion" is a unique term. If a battery car has a driving range of 500 kilometers (similar to a traditional gasoline car), the specific energy of a single battery must be above 300Wh/kg.

　　The improvement of battery specific energy is a slow process, far smaller than Moore's Law in the field of integrated circuits. This results in a scissor gap between the improvement of electronic device performance and the improvement of battery specific energy, and it is accompanied by the passage of time. The changes will be bigger and bigger.

　　3. Charge and discharge rate

　　This index will affect the continuous current and maximum current of the lithium battery during operation. Generally, the company is C (class), such as 1/10C, 1/4C, 1C, 4C, 10C, etc. For example, the short-circuit capacity of a certain battery is 10Ah. If its rated battery charging rate is 1C, it means that the battery of this model can be charged several times with a current of 10A until the battery is fully charged. Or the cut-off voltage of charge and discharge has been. If it is larger than [email protected], larger than [email protected], the rechargeable battery can be continuously charged and discharged at 100A current for 10 seconds, and the battery can be continuously charged at 50A current for 10 seconds.

　　The continuous output power and the maximum output power can be obtained by multiplying the current matching the charge and discharge multiples of the lithium battery by the working standard voltage. The more detailed the charge-discharge ratio index value is, the more guiding it will be when used. In particular, 18650 battery 3.7v 2200mah used as electric transportation power devices require continuous single-pulse polyploidy index values under different temperature conditions to ensure that they are within the range of practical use.

　　4. It is the working voltage

　　The working voltage of 18650 battery 3.7v 2200mah includes open circuit voltage, working standard voltage, battery charging cut-off voltage, charging and discharging cut-off voltage and other main parameters. This article will not discuss them independently, but mainly makes an explanation.

　　Working voltage, that is, the battery is connected to an external load or power supply. When the battery is in operation and there is current flowing through it, the potential difference between the positive and negative levels is accurately measured. Generally speaking, due to the presence of internal resistance in the battery, the operating voltage is lower than the open circuit voltage when charging and discharging, and is higher than the open circuit voltage when charging.

　　The battery charging cut-off voltage refers to the maximum and minimum working standard voltage allowed by the battery. Exceeding this level will cause certain irreversible damage to the battery, resulting in reduced battery performance. In severe cases, it may even cause fires, explosions and other production safety accidents. The open circuit voltage and working standard voltage of the lithium battery pack have a certain corresponding relationship with the volume of the lithium battery pack.

　　5. Service life

　　With use and storage, the service life of 18650 battery 3.7v 2200mah will gradually decrease and will have more significant performance. Let’s take smartphones as an example. After using a mobile phone for a period of time, you will obviously feel that the rechargeable battery on the mobile phone is not durable. At first, it is likely to be charged only once a day, and then it is likely to be charged twice a day. , which is the main manifestation of reduced battery cycle times.

　　The service life of 18650 battery 3.7v 2200mah can be divided into cycle service life and schedule service life. Cycle time Cycle time is generally expressed in terms of frequency, which indicates how often the battery can be recharged. Of course, there are standards for this. Generally, under ideal temperature and humidity, deep battery charging is carried out according to the rated battery charging current (100% or 80% DOD), and the battery power attenuation coefficient is calculated to reach 80% of the short-circuit capacity. The number of cycles experienced.

　　The definition of the service life of the battery is more complicated. The battery cannot always be charged, stored and idle, nor can it always be in an ideal environment. It will experience various temperature and humidity conditions. The battery The charging rate also changes at any time and at any time, so the specific service life must be simulated and tested. To put it simply, the planned service life is the time required for the battery to reach the end of service life (such as volume attenuation to 80%) under specific operating conditions and operating conditions. The use period of the schedule is closely related to the actual use requirements. It generally requires actual use conditions, environmental conditions, storage time, etc.

　　Planned service life is more realistic than cycle life. However, because the accurate measurement of plan service life is very complicated and takes too long, battery manufacturers generally only provide data on cycle life. If you need to get data on the life of the calendar, you usually have to pay extra and have to wait a long time.

　　6. Internal resistance

　　The internal resistance of a lithium battery refers to the resistance caused by the current passing through the interior of the battery during the working process. It includes the ohmic resistance and the polarization resistance, and the polarization resistance includes the photoelectric polarization resistance. Resistance and concentration polarization internal resistance.

　　The electrolytic resistor consists of metal electrodes, lithium battery electrolyte, diaphragm resistors and each part of the loop resistance. Electrical internal resistance refers to the resistor caused by electric polarization in electrochemical corrosion, including organic chemical electric polarization and concentration polarization.

　　Generally, the internal resistance value is milliohms (mΩ). A rechargeable battery with a large internal resistance value will consume a lot of internal power when the battery is being charged, and will become very hot, which will cause the rechargeable battery to become more brittle and reduce its service life. , and also limits the use of battery charging in large spaces. Therefore, the smaller the internal resistance is, the longer the service life and multiple of the lithium battery will be.

　　7. Self-discharge

　　When placed, the volume of the rechargeable battery continues to decrease, and the rate of volume decrease is called the lithium battery life rate, which is generally expressed as a percentage: %/month.

　　Self-charge and discharge is something we don’t want to see. A fully charged rechargeable battery will consume significantly less power after being left for a few months. Therefore, we hope that the self-charge-discharge ratio of 18650 battery 3.7v 2200mah will be as low as possible.

　　It should be noted here that once the battery life of the lithium battery causes the battery to lose power, the damage caused is generally irreversible. Even if the battery is recharged, the usable capacity of the battery will be greatly reduced, and the battery's The service life will also decrease quickly. Therefore, if you leave unused 18650 battery 3.7v 2200mah for a long time, you must remember to charge them on time to avoid battery loss due to battery life, which will seriously affect the performance.

　　8. Operating temperature range

　　Because of its compound properties, 18650 battery 3.7v 2200mah have a valid operating temperature range (general materials are between -40°C and 60°C). If the use temperature exceeds this range, it will cause great harm to the battery performance.

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