BAT
Battery
An electrochemical electrical source or storage element represented in a circuit.
SLD / Schematic
Symbols · BS
Battery string
A series connection of cells or modules reaching the system DC voltage, often with its own fuse or breaker and monitoring.
In plain English
What does Battery string mean?
A battery string is a group of cells or modules connected in series to reach the operating DC voltage of an inverter, UPS or DC system. Several strings may run in parallel to increase capacity, and each string normally has its own protective device and disconnect so that one string can be isolated without shutting down the others.
A simple example
Drawings show the battery symbol with the cell or module count annotated, a dashed line indicating omitted cells, and the string fuse or breaker at the positive and sometimes negative terminal. String current sensors and the battery management connections are often drawn at the same point.
What the drawings help you do
The symbol does not state how strings share current or what happens when one string has a weak cell. Parallel strings of different ages or states of health share current unevenly, which the drawing alone cannot reveal.
This particular reference
A series connection of cells or modules reaching the system DC voltage, often with its own fuse or breaker and monitoring. A string is one series chain; a battery bank or rack may contain several strings in parallel.
- DC
- Direct current: electricity flowing in one direction.
- Terminal
- An identified point where a conductor connects.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
Read the source: xStorage battery energy storage system · IEC graphical symbols for diagrams
SLD / Schematic · BS
What it represents
A battery string is a group of cells or modules connected in series to reach the operating DC voltage of an inverter, UPS or DC system. Several strings may run in parallel to increase capacity, and each string normally has its own protective device and disconnect so that one string can be isolated without shutting down the others.
Drawings show the battery symbol with the cell or module count annotated, a dashed line indicating omitted cells, and the string fuse or breaker at the positive and sometimes negative terminal. String current sensors and the battery management connections are often drawn at the same point.
The symbol does not state how strings share current or what happens when one string has a weak cell. Parallel strings of different ages or states of health share current unevenly, which the drawing alone cannot reveal.
How to read it
- Read the annotated number of cells or modules in series.
- Each parallel string should have its own isolation and protection.
Information to show or reference
- State cells or modules in series and nominal string voltage.
- Show string fuse or breaker and disconnect.
- Reference string current measurement.
A distinction that matters
A string is one series chain; a battery bank or rack may contain several strings in parallel.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
xStorage battery energy storage system
Public battery energy storage system context including string arrangements.
IEC graphical symbols for diagrams
IEC graphical symbol context for batteries.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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BR
Battery rack
A rack of series-connected battery modules with its own switchgear and battery management unit, forming one DC source.
SLD
GB cell
Single battery cell
One electrochemical cell drawn as a single long plate and short plate pair, marking cell-level voltage and polarity.
Schematic
PACK I
Battery pack current measurement
Pack-current measurement reports current entering or leaving the battery.
Schematic
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