How to Choose a Battery for Inspection Robots

Inspection robots are used in industrial facilities, warehouses, power plants, pipelines, outdoor infrastructure, and other environments where regular monitoring is required. These robots often operate with cameras, LiDAR, sensors, communication modules, motors, and onboard computing systems.

The battery is therefore an important part of the robot’s overall design. A suitable battery needs to provide enough energy for the required operating time while also meeting the robot’s voltage, discharge current, size, weight, charging, communication, and environmental requirements.

Lithium batteries, particularly lithium iron phosphate (LiFePO4) batteries, are used in some inspection robot applications because of their cycle life, thermal characteristics, and ability to support rechargeable operation.

This guide explains the key factors to consider when choosing a battery for an inspection robot.

Part 1.What Battery Does an Inspection Robot Need?

There is no single battery specification suitable for every inspection robot.

Battery requirements depend on the robot’s:

• Motorleistung
• Betriebszeit
• Travel speed
• Payload
• Sensors
• Computing system
• Communication equipment
• Betriebsumgebung
• Ladeverfahren
• Available battery space

For example, a compact indoor inspection robot may require a relatively small battery pack, while an outdoor inspection robot designed for extended operation may require a larger battery with higher capacity.

The first step is therefore to determine the robot’s electrical and mechanical requirements before selecting individual cells or a battery pack.

Part 2.Why Is the Battery Important for Inspection Robots?

Inspection robots may need to operate for several hours while continuously powering multiple systems.

A typical inspection robot may include:

• Drive motors
• Cameras
• LiDAR
• Infrared sensors
• Gas sensors
• Industrial sensors
• Wireless communication modules
• GPS
• Embedded computers
• Control systems
• Lighting systems

The battery must provide stable power to these components while also supporting the robot’s movement.

A battery with insufficient capacity can reduce operating time, while insufficient discharge capability can affect acceleration, climbing, or other high-load operations.

Part 3.Key Factors When Choosing an Inspection Robot Battery

1. Battery Voltage

Voltage should be selected according to the robot’s electrical system.

Inspection robots may use different voltage platforms depending on their motors, controllers, sensors, and system architecture. Common battery configurations can include 24V, 36V, 48V, and 51.2V systems, although the correct voltage must be determined by the equipment design.

When selecting a replacement or custom battery, check:

• Motor controller voltage
• Motor operating voltage
• Electronic component requirements
• Ladespannung
• Battery nominal voltage
• Maximum and minimum system voltage

The battery voltage should be compatible with the complete electrical system rather than selected independently.

2. Akkukapazität

Capacity is usually expressed in ampere-hours (Ah) or watt-hours (Wh).

For robot applications, watt-hours can be particularly useful because the energy requirement depends on both voltage and current.

The basic relationship is:

Energie (Wh) = Spannung (V) × Kapazität (Ah)

For example, a 24V 40Ah battery has a nominal energy capacity of approximately:

24V × 40Ah = 960Wh

Actual usable energy will depend on the battery chemistry, operating conditions, discharge rate, BMS settings, and other system factors.

When estimating battery capacity, consider the average power consumption and expected operating time.

Required Energy ≈ Average Power × Operating Time

A suitable design should also account for energy consumed by acceleration, slopes, sensors, computing equipment, communication systems, and other loads.

3. Continuous and Peak Discharge Current

Capacity is not the only important electrical specification.

The battery must also provide sufficient current for the robot’s highest expected load.

Drive motors can create short periods of increased current during:

• Start
• Beschleunigung
• Climbing
• Drehen
• Carrying payloads
• Crossing uneven surfaces

Therefore, battery specifications should include both:

• Kontinuierlicher Entladestrom
• Spitzenableitstrom

The BMS must also be capable of handling the required current without unnecessarily disconnecting the battery during normal robot operation.

4. Battery Size and Weight

Inspection robots have limited internal space, and battery weight can directly affect mobility.

When designing a battery pack, measure:

• Länge
• Breite
• Höhe
• Einbaulage
• Mounting points
• Connector location
• Cable routing

Weight distribution should also be considered.

A battery installed too far from the intended center of gravity may affect the robot’s stability or movement characteristics.

For mobile inspection robots, a compact battery design can help the equipment use its available internal space more efficiently.

5. Battery Chemistry

Different battery chemistries provide different characteristics.

Lithium-Ion Batteries

NMC and other lithium-ion chemistries can provide relatively high energy density, which can be useful when battery space and weight are limited.

LiFePO4 Batteries

LiFePO4, or lithium iron phosphate, is another lithium-ion chemistry used in rechargeable battery systems.

Potential characteristics include:

• Langer Lebenszyklus
• Stable thermal characteristics
• Low self-discharge
• Good discharge performance
• Suitable performance for repeated charging and discharging

LiFePO4 can be considered when an inspection robot requires regular cycling and a rechargeable battery system designed for repeated operation.

However, battery chemistry should be selected based on the complete robot design rather than assuming that one chemistry is suitable for every application.

6. Battery Management System

A Battery Management System (BMS) is an important component of a lithium battery pack.

The BMS can monitor and manage parameters such as:

• Zellspannung
• Pack voltage
• Ladestrom
• Entladungsstrom
• Temperatur
• Ladezustand (State of Charge, SOC)
• Zellausgleich

Protection functions can include:

• Schutz vor Überladung
• Schutz vor Überentladung
• Überstromschutz
• Kurzschlussschutz
• Schutz vor Überhitzung
• Kälteschutz

For inspection robots, BMS communication can also be useful.

Depending on the robot controller, communication interfaces may include:

• CAN
• CAN-FD
• RS485
• UART
• Modbus

The communication protocol should be matched with the robot’s control architecture.

7. Operating Temperature

Inspection robots may work indoors or outdoors.

Outdoor applications can expose the battery to:

• High temperatures
• Low temperatures
• Temperaturschwankungen
• Luftfeuchtigkeit
• Staub
• Rain or moisture

Temperature affects battery performance and charging behavior.

For lithium batteries, low-temperature charging requires particular attention. A custom battery pack can incorporate temperature monitoring and appropriate BMS protection based on the expected operating conditions.

The battery’s operating and charging temperature ranges should be confirmed before finalizing the battery design.

8. Charging Requirements

Charging time can affect robot availability.

Before selecting a battery, determine:

• Ladespannung
• Ladestrom
• Aufladezeit
• Ladeverfahren
• Charger type
• Ladehäufigkeit
• Automatic charging requirements

Some inspection robots return to a docking station automatically when the battery reaches a defined SOC.

For this type of application, the battery and charger need to be designed as a compatible system.

If the robot operates continuously, battery swapping can also be considered. A removable battery pack can allow one battery to operate while another is being charged.

9. Battery Communication

Advanced inspection robots may require the battery to communicate with the main controller.

Battery communication can provide information such as:

• SOC
• Batteriespannung
• Aktuell
• Temperatur
• Charging status
• Fault status
• Verbleibende Kapazität

CAN and RS485 are commonly considered for industrial battery communication, depending on the equipment architecture.

Communication requirements should be defined during the battery design stage rather than added after the pack has already been finalized.

10. Mechanical Protection

Inspection robots can experience vibration and mechanical impact during operation.

The battery enclosure should therefore be designed according to the robot’s operating environment.

Depending on the application, the battery may require:

• Protective housing
• Secure mounting
• Vibration-resistant construction
• Appropriate connectors
• Cable protection
• Moisture protection
• Dust protection

For outdoor inspection robots, enclosure and sealing requirements should be evaluated together with the robot’s overall protection design.

Part 4.How to Calculate the Required Battery Capacity

A basic capacity calculation can begin with the robot’s average power consumption.

For example, if an inspection robot consumes an average of 400W and needs to operate for 4 hours:

400W × 4h = 1,600Wh

A battery system providing approximately 1,600Wh of nominal energy would be the starting point for the calculation.

However, the actual battery capacity should normally include an appropriate design margin because not all nominal battery energy is necessarily available for practical operation.

Factors such as:

• Battery discharge limits
• Temperatur
• Motor load
• Batteriealterung
• BMS settings
• Terrain
• Payload
• Sensor load

can affect actual operating time.

Part 5.Example: 48V Inspection Robot Battery

Suppose an inspection robot uses a 48V electrical system and has an average power consumption of 500W.

If the target operating time is 4 hours:

500W × 4h = 2,000Wh

A 48V 40Ah battery provides approximately:

48V × 40Ah = 1,920Wh

This may be close to the calculated energy requirement, but the final battery capacity should be determined after considering usable energy, operating conditions, and system losses.

For a custom battery pack, the cell configuration can then be selected according to the required voltage, capacity, discharge current, physical dimensions, and BMS requirements.

Part 6.Why LiFePO4 Can Be Considered for Inspection Robots

LiFePO4 batteries can be considered for inspection robots that require frequent charging and discharging.

Potential advantages include:

Lange Lebensdauer

Inspection robots may operate frequently, resulting in repeated battery cycles. A battery chemistry designed for repeated cycling can be useful in these applications.

Stable Thermal Characteristics

LiFePO4 is known for its thermal characteristics, which can be relevant to mobile equipment operating in variable environments.

Low Self-Discharge

Lower self-discharge can help reduce energy loss during periods when the robot is not operating.

BMS-Integration

A LiFePO4 battery pack can incorporate a BMS to monitor cell and pack conditions and provide protection functions.

These characteristics do not eliminate the need for correct battery design. Cell selection, electrical configuration, BMS parameters, enclosure design, charging strategy, and operating temperature still need to be evaluated.

Part 7.Custom Battery Packs for Inspection Robots

Robot manufacturers may have different requirements for voltage, capacity, size, current, communication, and installation.

A custom battery pack can be designed around these requirements.

The customization process may include:

1. Define the robot’s electrical requirements
2. Determine voltage and energy requirements
3. Calculate continuous and peak current
4. Select battery cells
5. Design the cell configuration
6. Configure the BMS
7. Design the battery enclosure
8. Select connectors and cables
9. Conduct electrical and mechanical testing
10. Verify charging and communication functions

This approach can be useful when a standard battery cannot fit the robot’s available space or does not meet its current and communication requirements.

Part 8.Battery Testing for Inspection Robot Applications

Before deployment, the battery pack should be evaluated under conditions representative of the intended application.

Testing may include:

• Prüfung der Kapazität
• Prüfung von Ladung und Entladung
• Overcurrent protection testing
• Short-circuit protection testing
• Temperaturprüfung
• BMS communication testing
• Vibrationsprüfung
• Connector testing
• Enclosure testing

The specific tests and applicable certifications depend on the battery design, transportation requirements, target market, and final application.

Part 9.How to Choose an Inspection Robot Battery Manufacturer

When sourcing a custom inspection robot battery, consider whether the manufacturer can support the technical requirements of the project.

Zu den wichtigen Faktoren zählen:

• Battery cell selection
• PACK design capability
• BMS-Entwicklung
• Mechanical design
• Kommunikationsprotokolle
• Entwicklung von Prototypen
• Battery testing
• Qualitätsmanagement
• Unterstützung bei der Zertifizierung
• OEM/ODM capability

It is also useful to provide the battery manufacturer with detailed equipment information, including voltage, power consumption, operating time, peak current, dimensions, charging method, operating temperature, and communication requirements.

The more complete the technical information is, the easier it is to develop a battery pack that matches the robot.

FAQ

What type of battery is suitable for an inspection robot?

Lithium-ion and LiFePO4 batteries can be considered for inspection robots. The appropriate chemistry depends on energy requirements, weight, operating environment, cycle requirements, and the robot’s electrical system.

Is LiFePO4 suitable for inspection robots?

LiFePO4 can be suitable for inspection robots that require rechargeable battery systems with repeated cycling. The final battery design should consider voltage, capacity, discharge current, BMS, charging, temperature, and mechanical requirements.

How long can an inspection robot run on one battery?

Operating time depends on battery energy and the robot’s average power consumption. A basic estimate can be made using battery energy in Wh divided by average power consumption in W.

What voltage does an inspection robot battery use?

There is no universal voltage. Inspection robots can use different voltage platforms depending on their motors, controllers, sensors, and system architecture.

Does an inspection robot need a BMS?

Lithium battery packs generally require an appropriate BMS to monitor and protect the battery. For robotic applications, the BMS may also communicate with the robot’s main controller.

Can an inspection robot use a custom battery pack?

Yes. A custom battery pack can be designed around the robot’s voltage, capacity, current, dimensions, connectors, BMS, communication protocol, and installation requirements.

Schlussfolgerung

Choosing a battery for an inspection robot requires an evaluation of the entire power system rather than focusing on capacity alone.

Voltage, energy capacity, discharge current, dimensions, weight, battery chemistry, BMS, charging, temperature, communication, and mechanical protection should all be considered during the design process.

LiFePO4 batteries can be considered for inspection robots that require repeated charging and discharging, stable battery operation, and an integrated battery management system. For OEM robot manufacturers, a custom battery pack can also be designed around the robot’s electrical, mechanical, and environmental requirements.

A well-designed battery pack can provide the electrical characteristics needed by the robot while fitting the available installation space and supporting its intended operating cycle.