Bestgo Pouch Cell Overview
Lithium Battery Pack for EV
Lithium Battery Pack for EV pouch cells are riding the crest of a new way of thinking with regards to
energy storage. Lithium pouch cells are the new frontier. Bestgo's new pouch
cells are the current ultimate in weight, flexibility, and life. Our
company is getting glowing reports from a variety of customers who are using
pouch cells in robotics, yard maintenance equipment, undersea vehicles and
research products, and other applications where they are replacing small
engines in a variety of applications. Bestgo's factory has a production
capacity of over a million cells a month.
From a very basic level, here are some of the reasons that we like Lithium Battery Pack for EV pouch
Flexibility for your Lithium Battery Pack for EV:
offers completely assembled battery packs with the BMS built in as standard
battery module. With modules customer can assemble them in a parallel
configuration for increased capacity, or in a series configuration for a
voltage increase. If needed, the BMS can offer an output cable for communication.
These battery modules can be charged separately, or charged as a whole
battery pack if assembled.
Single Cell Introduction
uses 10Ah LiFePO4 Pouch cells to build the battery modules, these cells can
offer 3C continuous and 5C burst discharge current and also can accept fast
charge up to 1C. These cells have very long cycle life over than 2,000 times
if discharged no more than 80% DOD per cycle. Cells also have amazing
consistency and identical performance to make sure battery owns high reliable
Battery Module Structure
can offer battery modules fully assembled into complete battery packs. The dimension
and weight of each module can be adjusted to fit your space and weight
requirements. Bestgo will install a properly sized BMS for each module, this
BMS system will monitor the whole system and can be divided with
communication equipment so that the use can monitor and control the balance,
charging and discharging of the entire pack. The module will have a fuse,
indicator lights, a relay outlet for signal and two cables attached to the
Positive and Negative poles of the battery pack.
BMS will supply a balancing function during the charging state. The BMS will
monitor the cell voltage and prevent damage to the battery pack from charging
or discharging. The FUSE is replaceable which is mainly for over current
protection. Whenever the Module is under a abnormal condition the light
indicators will be glow. Also the BMS offer relay output as 5V (or 12V if
customized) for signal generation. The Relay can be triggered by the BMS to
activate related components to cut-off circuit.
Battery Pack Parameters
weight of a 48V 100Ah battery pack is about 113 Lbs. The capacity can be
increased if weight is acceptable. The module can have two (2) or four (4) wires
coming out of the battery pack to the positive and negative poles on the 2
count option and both poles and the charger for the 4 count option. The pack
has relay output for signal transform else has a breaker installed. A pack
can offer any number of voltage and amperage possibilities. The working
temperature for battery pack is -20 ~ 55C. While the best temperature to
obtain best performance is 10~45C.
Cell Specifications for your Lithium Battery Pack for EV:
3.2v LiFePO4 (BP-HK)
3.7v Li-NCM (BP-HK-LP)
Cycle Life: Bestgo has
tested a cell that was randomly picked off the assembly line. After the
accelerated equivalent of more than 12
years (4,400 charge cycles) of constant cycling this 10 AH cell still
registered about 9AH. That is a
very impressive drop of storage capacity after 12 years of about 10%.
View Test Results (1.2 MB)
Comparison of Pouch Cells verses
Many cylindrical cells only offer 1C continuous discharge, while Bestgo LiFePO4
pouch cell offer 3C continuous / 6C peak.
This means that an electric bike or other small vehicles or apparatus will
have much better performance in climbing, accelerating, etc. The vehicle user will feel the improved power
difference. The pouch cell shape is wide
and thin and therefore very suitable for big current applications. As a result the same current level pouch cell
is safer than cylindrical cells.
Reliability: As an example
a 36 volt pack at 10 AH the user will only need 12 pouch cells welded together.
If that same application were to use 18650
cylindrical cells, it will require 72 pieces of 1.5 Ah 18650 cells welded
together. In a series string if any of
the 72 cells have a problem the complete pack will fail. Also 72 cells means 144 nodes, each node represents
one potential fault. So a cylindrical
based pack is not as reliable as a electrically equivalent pouch cell pack
which would only have 24 nodes. In
addition the pouch cell welding procedure is much more reliable than welding cylindrical
Improved Energy Storage: A pouch cells
energy storage capacity is much greater in a given physical space in comparison
to cylindrical cells.
Safety: Whenever either pouch cells or cylindrical
cells have internal problems, pressure builds and they will swell up. In those infrequent situations pouch cells
merely swell up. Cylindrical cells are
traditionally encased in an iron jacket so that when the pressure builds within
a cylindrical whose ends are held captive by other batteries or the case they
can literally explode which could result in a dangerous safety hazard.
Weight: Typically pouch cells weigh less than the
equivalent prismatic or cylindrical battery.
The flat pouch cell energy density is greater than other shaped cells.
entire pouch cell line is manufactured by automatic equipment, thus
eliminating human error in hand made cells.
In between each step of the manufacturing process the cell is automatically
Watch this very short video to actually see how a pouch cell is
has a special PDMS matching system that automatically checks each cell and
allows their cells to have amazing uniformity and consistency.
BP-HKS series is one kind of Lithium Iron Phosphate pouch cell battery
offered by Bestgo Power Co., Ltd. These pouch cells have a very high energy
density, long cycle life, and the ultimate in lithium safety. Their high energy
density results in battery packs which are lighter and smaller. Longer cycle life means they have a lower
daily cost of operation. The LiFePO4 chemistry is the safest battery
available of all lithium battery chemistries. Thus, Bestgo takes pride in
making this high energy density type battery available to fill some light
traction applications such as e-bikes, e-scooters, portable power, etc.
ensure our battery quality, Bestgo starts by purchasing high quality raw
materials and then assemble these materials on a production line using
automated equipment, along with the latest in manufacturing processes and a
high degree of precision quality control. For instance, our LiFePO4 battery
processing, manufacturing and inspection equipment are directly imported from
specialized equipment manufacturers in Taiwan. Other materials like
separators are imported from qualified suppliers in Japan and China. Bestgo
then uses laser equipment to detect the thickness in the coating
process. This laser equipment
communicates with the coating machine in a feedback system to maintain tight
tolerances and make sure that no cells are produced outside preset
limits. Bestgo also deploys a PDMS
(Product Data management System) for quality control. Every step in the manufacturing process is
checked, logged and judged, so that if a problem occurs it will be discovered
early and any faulty product would be discarded. This automated attention to every step of
the manufacturing process results in higher yields and ultimately lower
cell produced at Bestgo?s factory is individually electrically tested on
automated testing equipment and the test results logged into Data Management
System. The results are that Bestgo can then offer well matched cells for
battery packs. When we need to choose the best candidate cells for battery
packs, Bestgo uses this Data Management System to calculate the cell's
electric properties for the best selection. The testing parameters include
the internal resistance, capacity, self-discharge rate, voltage and charge /
discharge curves etc. These are the reasons why Bestgo battery packs have a
superior quality over many other competitors.
Battery Pack + BMS + Charger
offers battery packs with a Battery Management System (BMS) integrated into
the pack if a customer orders these packs with protective regulated
circuitry. This active balancing BMS network will transfer energy from the
higher cells to lower cells in the pack when the battery pack is being
charged or discharged. This balancing and control network assures the user
that all cells will have almost the same voltage, capacity and have less
chance of being damaged due to overcharging or over discharging.
PCB: One of the other benefits to using pouch
cells for smaller applications is the fact that Bestgo can furnish with your
pack a very effective PCB (Protective Circuit Board) to balance the batteries
and protect them from over charging and being over discharged. For
smaller battery applications up to 72 volts The PCB approach is far more cost
effective than the more elaborate BMS systems. Each PCB board will control
up to 20 cells. PCB Spec Sheet (332 kb)
In production quantities the cells will cost less than $1.40 per AH.
discounts show in the “Shopping Pallet”.
We love to meet or beat any
Higher volume discounts, price matching or questions?
Contact Carl, our resident specialist.
9am-9pm Mon-Sat MDT