Robot Battery Packs

What a robot pack has to match: voltage, peaks, runtime, charging

A robot battery pack is specified from the robot's electrical and physical requirements, not from a standard catalogue item. The first inputs we ask for are nominal voltage, continuous and peak discharge current, runtime target, charging method and the space available for the pack. Get these onto one sheet and the cell configuration, protection circuit and enclosure follow from them.

Voltage is set by the series count and capacity by the parallel count. A 3S2P arrangement and a 48V class pack describe the same idea at different scales: series strings set the voltage window the robot's motor driver and electronics expect, parallel strings set how much charge the pack carries. Both are checked against the continuous and peak current profile before the specification is fixed, because a pack sized for average draw can still trip on a motor start.

Runtime targets translate into capacity only once the load profile is known. Robots rarely draw a flat current, so we work from a duty cycle that shows acceleration peaks, idle periods and the average draw over a shift. That profile also drives the choice of cells: a pack that must deliver high peak current needs cells rated for it, and a pack optimised for runtime may use a different cell.

Charging method closes the loop. Opportunity charging during short pauses, overnight charging on a dock, and manual pack swaps each place different demands on the BMS and on thermal design. The charge profile, connector type and communication with the charger are agreed together with the pack. This is the same starting point we use for AGV batteries, where uptime and dock behaviour dominate the specification.

Smart communication with the host system

A smart robot battery pack can report state of charge and state of health to the robot's controller. That data lets the host decide when to send the robot to a charger, derate performance when the pack is near its limits, and flag a pack that is ageing differently from its fleet mates. For a warehouse robot battery, this is often as important as capacity itself, because fleet uptime depends on knowing which packs are ready.

Communication options include CAN bus, RS485, SMBus-style interfaces, Bluetooth and WiFi. Each is evaluated per project: the host controller's existing bus, the charger's protocol and the service workflow all influence which interface makes sense. The documented industrial pack designs list RS485, RS232, SMBus and CAN support, which covers most mobile equipment controllers.

The battery management circuitry behind those interfaces handles charge and discharge management and SOC/SOH monitoring. Protection thresholds, current limits and reporting intervals are written into the project specification so that the robot integrator and the pack behave as one system. Bluetooth and WiFi are useful for service access and diagnostics where a wired connection is inconvenient, while CAN and RS485 suit hard-wired control loops.

Options are confirmed in the project specification; not every model carries every option. When you spec a robot pack, tell us which bus the host uses and what data it needs, and the communication layer is defined alongside the electrical specification.

Pack shapes for mobile bases and manipulators

The battery compartment usually decides the enclosure. Mobile bases tend to offer a flat, wide volume low in the chassis, while manipulators and articulated arms need mass placed to keep balance and swing inertia predictable. We work from your compartment drawing and mounting points, then propose a pack form that fits without forcing a chassis redesign.

Enclosure forms include soft-pack structures, heat-shrink covering and injection-molded housings. Soft-pack structures suit tight or irregular spaces where a hard case would waste volume. Heat-shrink covering gives a compact, lightweight pack for protected compartments. Injection-molded housings provide a defined shape with mounting features and mechanical protection for exposed installations. The choice interacts with thermal design: how heat leaves the cells depends on the enclosure and on how the pack sits in the robot.

Cell selection, pack voltage and capacity via series/parallel configuration, protection and battery management circuitry, and thermal considerations are all part of the customization scope. Because these decisions are interdependent, we prefer to review the compartment, the load profile and the charging plan together rather than quoting a pack from a single number. Our pack design support process walks through that review step by step.

For robots that must be serviced in the field, connector placement and pack removal are designed in from the start. A pack that takes too long to swap undermines fleet availability regardless of its capacity. Where a robot shares a platform with other machines, the same custom lithium ion packs approach can be reused across variants with adjusted series/parallel counts and enclosures.

Frequently Asked Questions

Can you design packs for our robot's voltage and discharge profile?

Yes. Design starts from your robot's nominal voltage, continuous and peak discharge current, runtime target, charging method and available battery compartment. Pack voltage and capacity are set through series/parallel configuration and checked against the current profile before the specification is written. Send the duty cycle and compartment drawing, and the cell selection, protection circuit and enclosure follow from those inputs.

Do you support smart communication with the host system?

Yes. Smart packs can report state of charge and health data, and communication options include CAN bus, RS485, SMBus-style interfaces, Bluetooth and WiFi. Each option is evaluated per project and confirmed in the specification; the documented industrial pack designs list RS485, RS232, SMBus and CAN support. Tell us which bus your host controller uses and what data it needs.

What information do you need to quote a robot battery pack?

Nominal voltage, continuous and peak discharge current, runtime target, charging method and the available battery compartment are the core inputs. Add the duty cycle, the host communication bus and any mounting or swap requirements. With these, we can propose a configuration and enclosure form and confirm which options apply to your project in the specification.

Are the packs built to order or selected from a catalogue?

Built to order. Customization covers cell selection, voltage and capacity via series/parallel configuration, protection and battery management circuitry, thermal considerations, and enclosure forms including soft-pack structures, heat-shrink covering and injection-molded housings. Options are evaluated per project and confirmed in the specification; not every model carries every option. Start with the requirements sheet and we will map the configuration to it.