Although lead-acid batteries have been gradually used by lithium batteries – especially lithium iron phosphate batteries that can perfectly replace lead-acid batteries – the price has been falling, it seems that the future of lead-acid batteries is extremely bleak.

　　Although SES Power has been engaged in the development and production of lithium-ion batteries, we have been paying attention to the situation of lead-acid batteries, which we believe will still have very broad applications for a long time in the future. This is the result of the difference between lead-acid batteries and lithium batteries.

　　Among them, EFB lead-acid batteries are suitable for scenarios with harsh temperature environment and high current demand, which are ideal for use in start-stop devices of automobiles, which have stronger advantages than AGM lead-acid batteries. although SES Power has successfully used high rate lithium iron phosphate batteries to make products that can replace EFB lead-acid batteries, there is no denying that the price advantage of EFB lead-acid batteries is quite obvious The price advantage of EFB lead-acid batteries is undeniable.

　　A: EFB Battery Overview

　　The full name of EFB battery is enhanced maintenance-free lead-acid battery, which is an upgrade of the ordinary liquid-rich battery, while new materials, new technologies and new production equipment to ensure the stability of the EFB battery performance and quality, in terms of battery life, low-temperature starting, water loss, etc. have been greatly improved. The battery is mainly used in cars equipped with start-stop system.

　　B: Characteristics of EFB battery

　　1. performance characteristics of EFB battery in addition to the use of no need to add supplementary water and no other maintenance, but also should have: Ø low self-discharge, after a longer period of storage can still be used (3 months) Ø low temperature starting power, adapt to frequent starting Ø charging reception performance is good Ø long service life (3 ~ 5 years) Ø safe explosion-proof Ø small water loss

　　2. structural features: EFB battery adopts new alloy, new lead paste formula and new spacer, this series of measures make EFB battery in battery life, water loss, low temperature starting, etc. has been greatly improved, the unique tight assembly makes the battery in the process of use effectively prevent the battery lead paste softening off, the battery internal new patented design infusion device can effectively prevent the acid stratification phenomenon, at the same time The new patented design of "labyrinth lattice" design of the large cover effectively prevents the overflow of acid and acid mist, which increases the safety of battery use.

　　3. Use characteristics: EFB battery has low self-discharge and long service life. Maintenance-free lead-acid batteries generally last 2 to 3 years, while EFB batteries can last 3 to 5 years. At the same time, EFB battery adopts new technology, low temperature starting current has been greatly improved compared with ordinary maintenance-free battery.

　　C: The difference between EFB battery and common maintenance-free battery battery

　　EFB battery cover uses new structure; common maintenance-free battery cover uses traditional structure EFB uses new partition; common maintenance-free uses PE partition EFB uses new design plate grid; common maintenance-free uses traditional design plate grid EFB low-temperature starting current is large; common maintenance-free low-temperature starting current is relatively small EFB service life is 3-5 years; common maintenance-free service life is 2-3 years EFB Adopt constant-voltage current-limiting charging; ordinary maintenance-free adopts constant-voltage charging

　　D: Maintenance and management of EFB battery

　　The EFB battery is characterized by the fact that no other maintenance is required during use, except for storage under normal battery conditions.

　　Ø EFB batteries are strictly prohibited to be stored at a loss of power (voltage cannot be lower than 12.6V)

　　Ø EFB batteries are strictly prohibited to be stored under sunlight and non-ventilated conditions

　　Ø EFB batteries are strictly prohibited to be inverted or tilted 45° for more than 60 minutes during storage

　　Ø EFB batteries need to be replenished after being stored for a long time, generally once every 3 months.

　　E: Charging of EFB battery

　　1. Charging method: Another feature of EFB battery compared with ordinary maintenance-free lead-acid battery is the use of constant voltage and current limiting charging. As we know, at the end of constant current charging of ordinary batteries, the terminal voltage of the battery can reach 2.6-2.8 volts/single cell, and a large amount of gas will be generated in the battery at such high charging voltage. Even for maintenance-free batteries, a large amount of gas will be produced, which will affect the service life of the battery.

　　2. Charging value setting: EFB battery charging should implement constant voltage current limiting charging method, charging voltage is 16V, charging current ≤ 5I20 (I20 is the rated capacity of the battery divided by the value of 20, for example, EFB 70Ah battery, I20=3.5A), charging process should detect the battery temperature change, every 2 hours to accurately observe the battery reflecting the situation, such as the temperature is too high should immediately stop charging .

　　F: Detection of fault

　　EFB battery compared with ordinary lead-acid battery, its failure rate is very low, it is in addition to the use of new materials, which has a lot to do with its manufacturing process, EFB battery a liquid charge, the battery is filled after the test after the second filling acid heat sealing, such as battery quality problems, before the heat sealing has been exposed. So, don’t worry about the quality of EFB battery on your hands.

　　But there is no absolute 100% of any product, so EFB batteries also have relative quality problems, the following is a brief description of the EFB battery testing method.

　　Appearance judgment method

　　Ø first tilt the battery on all sides to see if the battery heat sealing liquid seepage or leakage Ø tilt the battery left and right to see if the battery filter is off or exhaust hole whether there is liquid outflow

　　Voltage detection method

　　Ø test the battery voltage voltages are normal, such as 12.75V electricity is sufficient, 12.6V electricity is slightly loss, 12V loss, 10V may have short circuit problems, but also refer to the color of the battery capacity visualizer Determine.

　　Charging check method

　　Ø less than 12V battery charging requirements in accordance with the charging check, such as 12-18 hours to reach 12V battery may have short-circuit problems, analyze the causes into parallel processing. In the charging process to reach 14V to continue charging until the battery to the fully charged state.