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1
®
AN167.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Using Cell Balancing to Maximize the Capacity of
Multi-cell Li-Ion Battery Packs
Introduction
Common multiple cell configurations for LiIon cells in battery
packs consist of three or four cells in series, with one or
more cells in parallel. This combination gives both the
voltage and power necessary for Portable Computer,
medical, test and industrial applications. While these
configurations are common today, they may not be as
efficient as they could be. The reason for this is that any
capacity mismatch between cells in a series connection of
cells results in a reduction of overall pack capacity.
There are two kinds of mismatch in the pack,
State-of-Charge (SOC) and capacity/energy (C/E)
mismatch. Each problem limits the pack capacity (mAh) to
the capacity of the weakest cell. It is important to recognize
that the cell mismatch results more from limitations in
process control and inspection than from variations inherent
in the Lithium Ion chemistry. As such, these types of cell to
cell variation more likely occur in LiIon prismatic cells, due to
more extreme mechanical stresses, and in LiIon Polymer,
due to the newer processes involved.
The use of cell balancing can improve the performance of
series connected LiIon Cells by addressing both
State-of-Charge and Capacity/Energy issues. SOC
mismatch can be remedied by balancing the cell during an
initial conditioning period and subsequently only during the
charge phase. C/E mismatch can be remedied by balancing
during both charge and discharge periods. Even though the
defect level for a given cell manufacturer may be very low,
the extra confidence that a pack will not be returned,
because of an early end of life, may be well worth the extra
effort. It provides another level of quality assurance.
To provide some insight into the issues, this article discusses
cell balancing, offers some guidelines for implementing cell
balancing, and provides some actual results achieved
through cell balancing techniques.
Definition of Cell Balancing
For portable systems requiring 6V or more of operating
voltage, battery packs utilize battery cells connected in
series. A series connection results in a pack voltage equal to
the sum of the cell voltages. For portable computers (PCs),
the battery pack typically has 3 or 4 cells in series with
nominal voltages of 10.8V or 14.4V. In the majority of these
applications, the system requires more energy than is
provided by a single series string of battery cells. Since the
largest cell typically available (i.e. 18650) has a capacity
2000mAh, a PC requiring 50–60 Whr. of energy (5000–6000
mAh) requires three cells connected in parallel to each of the
series cells.
Cell balancing is defined as the application of differential
currents to individual cells (or combinations of cells) in a
series string. Normally, of course, cells in a series string
receive identical currents. A battery pack requires additional
components and circuitry to achieve cell balancing.
Cell balancing is only considered when multiple cells in a
battery pack are connected in series and usually when there
are three or more series cells. Battery pack cells are
balanced when all the cells in the battery pack meet two
conditions.
1. If all cells have the same capacity, then they are balanced
when they have the same relative State of Charge (SOC.)
SOC is usually expressed in terms percent of rated
capacity. In this case, the Open Circuit Voltage (OCV) is
a good measure of the SOC. If, in an out of balance pack,
all cells can be differentially charged to full capacity
(balanced) then they will subsequently cycle normally
without any additional adjustments. This is mostly a one
shot fix. The customer usually has instructions with a new
pack to provide an overnight conditioning on the first
cycle. Overnight conditioning typically consists of one
complete discharge, followed by one complete charge
cycle. Conditioning the pack overnight reduces the
demands on the cell balance circuitry by minimizing the
load and maximizing the charge time.
2. If the cells have different capacities, they are also
considered balanced when the SOC is the same. But,
since SOC is a relative measure, the absolute amount of
capacity for each cell is different. To keep the cells with
different capacities at the same SOC, cell balancing must
provide differential amounts of current to cells in the
series string during both charge and discharge on every
cycle. Since charge and discharge cycles times can be
shorter than the initial charge time, this process demands
higher currents. Therefore, it is a much more demanding
issue.
When the cells in the battery pack are not balanced, the
battery pack has less available capacity. The capacity of the
weakest cell in the series string determines the overall pack
capacity. In an unbalanced battery pack, during charging,
one or more cells will reach the maximum charge level
before the rest of the cells in the series string. During
discharge the cells that are not fully charged will be depleted
before the other cells in the string, causing early
undervoltage shutdown of the pack.
Manufactured cell capacities are usually matched within 3%.
If less than optimal Li-ion cells are introduced in to a series
string pack or cells have been on the shelf for a long period
prior to pack assembly, a 150mV difference at full charge is
possible. This could result in a 13-18% reduction in battery
pack capacity.
Application Note
Authors: Carlos Martinez, Dave Sorlien, Raymond Goodrich,
Lance Chandler, Doug Magnuson
June 7, 2005