Quad lithium battery combined with 18650 battery is an 8 point 4 volt power connector lamp. Quaternary lithium batteries contain more metallic elements than ternary lithium batteries, mainly cobalt. The price and cost of cobalt in the market is very high. Many automakers are hoping to find a cheaper alternative to replacing it with metal. elements with better performance, quaternary lithium ion batteries are exploring abandoning or reducing the cobalt element, such as adding aluminum elements to the high nickel ternary element, and changing the conventional practice of graphite anodes, adding a silicon-carbon layer, forming a more stable quaternary lithium-ion battery.
Contents of 18650 battery
18650 lithium battery is a lithium battery commonly used in electro productsniques. It is often used as a battery core in laptop batteries. The definition rule for its model is for example type 18650, which refers to a cylindrical battery with a diameter of 18 mm and a length of 65 mm.
The theoretical lifespan of the 18650 battery is 1,000 charge cycles. Due to the large capacity per unit density, most of them are used in laptop batteries. In addition, the stability of the 18650 at work is very good. , widely used in various major electronic fields, often used in high-end bright flashlights, portable power supplies, wireless data transmitters, electric thermal clothing, shoes, portable instruments, portable lighting equipment , portable printers, industrial instruments, medical instruments, etc.
The principle of operation of batterieslithium-ion refers to its principle of charge and discharge. When the battery is charged, lithium ions are generated on the positive electrode of the battery and the generated lithium ions move to the negative. The electrode passes through the electrolyte and serves as a negative electrode. Carbon has a layered structure and has many micropores. The lithium ions that reach the negative electrode are integrated into the micropores of the carbon layer. The more lithium ions, the higher the level. charge capacity.
The difference between 3 cell lithium ion batteries and 4 cell batteries
The 18650 battery "Shenhuo" online is seriously mislabeled and is viciously misleading.
The highest capacity of 18650 cylindrical lithium battery is original imported Panasonic 3400mah. So far, no higher capacity has been found.
The all-new domestic battery18650 lithium battery is classified into nine commonly used capacities: 800, 1000, 1200, 1500, 1800, 2000, 2200, 2400 and 2600 mAh. As for the original capacity of the falsely marked "Shenhuo" 6800mah, it depends on the consciousness left by the person who falsely marked. The worst thing is to use garbage to renovate old lithium batteries, and the capacity and lifespan are not guaranteed at all.
You can use the domestically produced 2200 mah or the original Samsung 2600 mah, these two are the most cost effective. You can buy it online, but you still have to be careful to choose a reliable merchant. There are still many counterfeit products.
What does the core of a 4 cell battery mean?
The differences between the two batteries are as follows:
The price of 3-cell lithium batteries is relatively low and the volume is relatively small. The capacity of the ba3-cell lithium batteries are small, so they are suitable for users who use it lightly.
A 4-cell lithium battery means that there are 4 cells inside the battery, usually 3.7V cells, with a total voltage of 14.8V. For 3 cell lithium batteries, 4 cell lithium batteries have larger capacity and can provide longer usage time.
Thinkpad sl300 (4 cell battery), I used a multimeter to measure the voltage of 15V, why does it say it is discharged? Is the computer measurement inaccurate?
1. The core of a 4-cell battery means that there are four lithium batteries inside.
2. The most commonly used battery cell specification in general laptops is 18650, which is 18mm thick and 65mm long. The more cells there are, the more capacity is generally aincreased. three cores are 6 cores, double four cores is 8 cores. The cells are connected in series to achieve the required voltage and in parallel to achieve the required capacity.
The voltage you detected at 15 V is actually very close to vacuum. The lowest voltage of a 4 cell lithium battery is 14.4 volts, not 0 volts. The lowest voltage of a single lithium battery is 3.6 volts. To reach this voltage, the battery was discharged. If it continues to be discharged, the battery will be over-discharged, resulting in permanent damage.
The voltage of a fully charged lithium battery is 4.2 volts. Since the internal cells of the thinkpad's standard lithium battery are connected in series, the voltage of all four cells is 16.8 volts. This is an upper limit that cannot exceed this value. If it exceeds this value, it is overloaded. The consequenceence of lithium battery overcharging is that too many electrons are embedded in the crystal lattice, permanently losing the charge and discharge capacity. can even catch fire. Prevention of overcharging and overdischarging is implemented by the battery safety chip. Once the battery safety chip detects that the voltage is too low, it will no longer discharge and the laptop will display that the battery is empty. As for the 15V voltage you detected, it did not drop to 14.4V. It is possible that one or more of the four lithium batteries were discharged in order to protect these discharged lithium batteries from excessive discharge or reverse charging (which has not yet been done) The discharged battery reverse charges the empty battery. At that time, the empty battery cell voltage will appear negative), and the battery safety chip also stops the discharge ofthe battery, indicating that the battery is empty. This phenomenon is caused by the inconsistent performance of the battery core and is usually caused by assembly. Sometimes cells with similar performance will be selected to assemble a battery, but it cannot be completely avoided that some cells will decompose more quickly.
The voltage of lithium batteries will gradually drop from 4.2V to 3.6V during operation. The voltage change is very small, which is one of the advantages of lithium batteries.
If you have verified that each battery cell has a voltage of approximately 3.8V and the ThinkPad's built-in power management software indicates that the voltage is 15V, you can use the ThinkPad battery scale. Power management software. The calibration function is used to calibrate the battery. It will fill the battery, then drain it thenwill fill it, allowing the battery safety chip to re-identify the charge and discharge curve, correct the deviation and obtain the current true capacity. In addition, call source management software contains detailed battery information, including battery rated capacity, rated voltage, current voltage, remaining capacity, number of uses, etc. If the battery is truly defective, it can provide relevant information.