BS
Battery string
A series connection of cells or modules reaching the system DC voltage, often with its own fuse or breaker and monitoring.
SLD / Schematic
Symbols · BR
Battery rack
A rack of series-connected battery modules with its own switchgear and battery management unit, forming one DC source.
In plain English
What does Battery rack mean?
In stationary lithium-ion systems a battery rack holds modules connected in series to form one string, together with a rack-level switchgear box containing contactors, fuses, precharge circuit and the rack battery management unit. Racks are then paralleled onto a DC bus feeding the power conversion system.
A simple example
Single-line diagrams draw each rack as a battery symbol within a boundary box that also contains the rack contactors and fuse, with the management unit shown as a small block linked by a communication line. Large systems may show one typical rack and note the number of racks in parallel.
What the drawings help you do
The rack boundary on an electrical drawing does not describe mechanical arrangement, fire separation or cooling. It also does not state whether racks of different capacities can be mixed, which the battery manufacturer must confirm.
This particular reference
A rack of series-connected battery modules with its own switchgear and battery management unit, forming one DC source. A rack is the packaged string with switchgear and management; a plain battery string symbol shows only the series cells.
- DC
- Direct current: electricity flowing in one direction.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Coil
- A wound conductor that can produce a magnetic field when energised.
Read the source: xStorage battery energy storage system · Lynx Smart BMS NG official product and documents
SLD · BR
What it represents
In stationary lithium-ion systems a battery rack holds modules connected in series to form one string, together with a rack-level switchgear box containing contactors, fuses, precharge circuit and the rack battery management unit. Racks are then paralleled onto a DC bus feeding the power conversion system.
Single-line diagrams draw each rack as a battery symbol within a boundary box that also contains the rack contactors and fuse, with the management unit shown as a small block linked by a communication line. Large systems may show one typical rack and note the number of racks in parallel.
The rack boundary on an electrical drawing does not describe mechanical arrangement, fire separation or cooling. It also does not state whether racks of different capacities can be mixed, which the battery manufacturer must confirm.
How to read it
- One typical rack is often drawn with a multiplier note for the rest.
- Rack contactors are opened by the management system, not by the inverter.
Information to show or reference
- State modules per rack and rack voltage.
- Show rack contactors, fuses and precharge.
- Reference number of racks in parallel.
A distinction that matters
A rack is the packaged string with switchgear and management; a plain battery string symbol shows only the series cells.
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 cabinet context.
Lynx Smart BMS NG official product and documents
Public battery management and contactor control documentation context.
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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