24V IFR32700 18Ah Lifepo4 Battery Portable UPS Batteries
species |
Lithium Iron Phosphate |
Voltage | 32700-24V |
capacity | 18AH |
Batteries | IFR26650 3.2V 3.3Ah |
size | 182*77*169mm |
weight | 3.3KG |
Maximum charging current | 25A |
Maximum discharge current | 25A |
Display screen | No |
Communication support | Bluetooth |
At present, there are more and more articles promoting the fast
charging of power batteries, some manufacturers' publicity, some
excessive, and some experts also follow the trend and say that 30
minutes, 15 minutes can complete the charging of electric vehicles,
and more ridiculous, saying that the charging task can be completed
within 5 minutes. The author expressed concern that these
propaganda will be detrimental to the development of the industry,
and people engaged in engineering understand that "the principle
does not work, and the engineering cannot be passed", and the
principle of lithium-ion batteries has told people that they cannot
be charged quickly.
1. What is fast and slow charging?
On-board batteries have positive and negative poles, and those that
can charge the battery must be a DC power supply with positive and
negative poles. What do you mean? The alternating current from the
grid cannot directly charge the on-board battery.
However, to charge electric vehicles, they are all 220V for
civilian use, or 380V alternating current for factories. Why is
that? This is a "alternating current-to-direct current (AC/DC)"
device used by engineers to turn alternating current into direct
current. For the average user, keep in mind that:
(1) The power supply for charging the on-board battery must be DC
power supply, and the AC power supply cannot "directly" charge the
lithium-ion battery.
(2) Where is the DC power supply? At present, the electricity in
the power grid is alternating current. The direct current used to
charge an electric vehicle is converted through an "alternating
current-to-direct current (AC/DC)" device.
(3) "ALTERNATING CURRENT-DC (AC/DC)" is a device that meets the
requirements of the standard. If this device is installed in the
car, the car and the charging interface are the AC charging
interface; If this device is installed under the car (ground), the
car and the charging interface are AC and DC interfaces.
(4) The alternating current (AC/DC) device can be made into a
high-power device on the ground (note: the greater the power, the
larger the volume and the heavier the mass; However, automobiles
have insulation requirements, volume and weight restrictions, so
the AC/DC in the vehicle is low power.
The first level is the concept of "fast and slow". The charging
speed of the DC interface is faster than that of the AC charging
interface. In principle, the charging speed of the DC interface is
3 hours to 4 hours, and the AC charging interface is 6 hours to 8
hours. (Note: The power grid can guarantee the provision of 220V
for civil use, or 380V AC for factory use)
The second level is the concept of "fast and slow". At present, the
charging speed of the theoretical DC interface is 3 to 4 hours,
compared with 5 minutes of refueling for fuel vehicles. Due to the
limitations of the principle, some experts put forward the concept
of "30 minutes (or 15) charging to 80%", there is still 20% space,
and the charging time is ignored. In other words, the whole process
of charging is segmented.
The third level is the concept of "fast and slow". The DC interface
cannot be fast, which means that the whole process is from 3% to
99%, and it is fully charged; The DC port can be charged quickly,
basically referring to 20% to 80% of the entire space. This is part
of the lithium-ion battery charge (discharge) curve. Some
manufacturers have made some optimizations to this curve. In
principle, there is no substantial innovation.
