There are some common terms and abbreviations in the section about battery parameters in the BIGLUX solar trailer specification, if you want to know what they mean, you can take a look at this article.
Capacity
Refers to the amount of electricity that can be obtained from the battery lithium under certain discharge conditions. The formula for the amount of electricity is Q=I*t in coulombs, and the capacity of the battery is in Ah (ampere-hours) or mAh (milliampere-hours). It means that a 1AH battery can be discharged for 1 hour with a current of 1A when fully charged.
Charge-rate /Discharge-rate
It refers to the magnitude of the charging and discharging currents, which are generally calculated as a multiple of the nominal capacity of the battery, generally referred to as a few 'C'. For example, for a battery with a capacity of 1500mAh, it is stipulated that 1C=1500mAh, if it is discharged at 2C, it is discharged at 3000mA, and 0.1C is charged and discharged at 150mA.
Open circuit voltage( OCV)
The voltage of the battery generally refers to the nominal voltage of the lithium battery (also called the rated voltage) The nominal voltage of the ordinary lithium battery is generally 3.7V When the battery is 20~80% capacity, the voltage is concentrated at about 3.7V (3.6~3.9V), and the voltage varies greatly when the capacity is too high or too low.
Energy/ Power
The energy (E) that can be released by the battery at a certain standard discharge, in Wh (watt hour) or KWh (kilowatt hour), in addition 1KWh = 1 degree of electricity. e=U*I*t, also equal to the battery voltage multiplied by the capacity of the battery. The formula for power is, P=U*I=E/t, which refers to the amount of energy that can be released per unit of time. The unit is W (watt) or KW (kilowatt). For example, the nominal voltage of a battery with a capacity of 1500mAh is usually 3.7V, so the corresponding energy is 5.55Wh.
Resistance
Since charging and discharging cannot be equated to an ideal power supply, there is a certain internal resistance. Internal resistance is to consume energy, the smaller the internal resistance the better. The unit of internal resistance of the battery is milliohm (mΩ). The general battery internal resistance consists of ohmic internal resistance and polarized internal resistance, and the size of the internal resistance is affected by the battery material, manufacturing process, and the structure of the battery.
Cycle life
Battery charging and discharging once is called a cycle, and cycle life is an important indicator of battery life performance. IEC standard stipulates that the cell phone lithium battery, 0.2C discharge to 3.0V, 1C charge to 4.2 V, repeatedly cycle 500 times after the battery capacity should be maintained at more than 80% of the initial capacity. In other words, the cycle life of lithium battery is 500 times. The national standard stipulates that after 300 cycles, the capacity should remain at 70% of the initial capacity.
Depth of discharge
Defined as the percentage of capacity discharged from the battery to the rated capacity. The deeper the general depth of discharge of a lithium battery, the shorter the battery life.
Cut-off voltage
The cut-off voltage is divided into charging cut-off voltage and discharging cut-off voltage, that is, the voltage at which the battery cannot be charged or discharged, and the life of the battery is greatly affected by further charging or discharging at the cut-off voltage. The charging cut-off voltage of Li-ion battery is generally 4.2V and the discharging cut-off voltage is 3.0V. The deep charging or discharging of Li-ion battery beyond the cut-off voltage is strictly prohibited.
Self-discharge
It refers to the rate of capacity decline of the battery during storage, expressed as the percentage of content decline per unit of time. The self-discharge rate of general lithium battery is 2%~9% / month.
State of charge( SOC)
Refers to the percentage of the remaining battery charge to the total charge that can be discharged, 0~100%. Reflects the remaining battery charge.
Lithium battery naming rules
Different manufacturers have different naming rules, but universal batteries all follow a unified standard, according to the name of the battery can know the size of the battery, etc. IEC61960 provides that the rules for cylindrical and square batteries are as follows.
Cylindrical unit with 3 letters followed by 5 digits
The first letter indicates the negative electrode material, 'I' for lithium ion with built-in, and 'L' for lithium metal or lithium alloy electrode. The second letter indicates the positive electrode material, 'C' for cobalt, 'N' for nickel, 'M' for manganese, and 'V' for vanadium. The third letter is 'R' for cylindrical. The first two numbers indicate the diameter and the last three numbers indicate the height, all in mm.
Square cell, 3 letters followed by 6 more digits
3 letters, the first 2 letters have the same meaning as cylindrical, and the last one is 'P' for square. 6 numbers, the first 2 numbers indicate thickness, the middle 2 indicate width, and the last 2 indicate height (length), also in mm.
For example: ICR 18650 is a universal 18650 cylindrical battery with a diameter of 18mm and a height of 65mm; ICP 053353 is a square battery with a thickness of 5mm, a width of 33mm and a height (length) of 53mm.
Hope this article helps, thanks for reading. BIGLUX is looking forward to more business partner, please feel free to contact us if you're interested in.
