Connection technology for energy storage systems

Energy storage: The key to sector coupling
Connection technology for energy storage systems

Electrical energy storage devices play a crucial role in the implementation of sector coupling. Rely on innovative connection technology from Phoenix Contact for your energy storage solution.

Man with green battery and icons for sector coupling

We are therefore the ideal partner

  • As a company empowering a CO2-neutral world, we support you with leading solutions for sector coupling
  • Implement your individual contacting solutions for battery storage systems and Power-to-X applications
  • Take advantage of reliable connection technology for safe and space-saving wiring of your energy storage
  • Identify optimization potential through professional consultation with our experts for energy storage applications
White paper
Energy storage: The key to sector coupling

Learn what is important in the selection, design, and operation of energy storage systems in this white paper. The issues covered include increasing security of supply through batteries and power-to-X processes, as well as the selection of suitable connection technology.

Download the white paper free of charge
Energy storage with wind turbines and solar panels

Utility-scale storage


Utility-scale storage

Solutions for utility-scale storage

Utility-scale storage systems are used as a backup for the grid. For example, they allow high peak loads at fast charging stations for electric vehicles despite inadequate grid infrastructure. Another use of utility-scale storage systems is the storage and provision of energy depending on the price of electricity in energy trading.

Each level of an energy storage solution places different requirements on the electrical connection technology for signals, data, and power.
The following two application examples for battery module wiring and for battery rack connection illustrate the versatility of device and field wiring.

Components for battery module wiring

Reliable and low-loss connections are required for the reliable distribution of power flows inside the battery module. Innovative connection technologies are used for the efficient connection of signal lines. Data connections in accordance with current product standards ensure high failsafe performance.

Interaktive Image Map: Connectors for energy storage in a battery rack
Battery-pole connectors
Device and cable connectors that are protected against polarity reversal are ideal for use in energy storage systems.
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Battery-pole connectors
Signal connection with insulation displacement connection technology
Transmit information securely and reliably with connectors from Phoenix Contact.
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Signal connection with insulation displacement connection technology
Lever-actuated PCB terminal blocks
New levels of convenience with LPT series PCB terminal blocks.
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Lever-actuated PCB terminal blocks
Lever-actuated PCB connectors
New levels of convenience with LPC-series PCB terminal block connectors.
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Lever-actuated PCB connectors
Board-to-board connectors
Robust FINEPITCH series board-to-board connectors.
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Board-to-board connectors
Signal connection with Push-in Technology
Convenient PCB terminal blocks with a compact size.
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Signal connection with Push-in Technology
Circular connectors
Greater flexibility when it comes to the device connection and system cabling.
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Circular connectors
Single Pair Ethernet connectors
The standardized SPE interfaces are ideally suited for efficient data transmission.
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Single Pair Ethernet connectors

Components for rack BMS insertion

The rack BMS slide-in module connects to the overall system via a blind-mating feature on the rear, thus not endangering the installer in any way. On the front, the individual battery modules of the rack are connected via efficient and user-friendly plug-in connections. Innovative connection technologies for fast and reliable manufacturing processes are used for the internal wiring of power, signal, and data components.

Interactive Image Map: Connection technology for energy storage
Battery-pole connectors
Device and cable connectors that are protected against polarity reversal are ideal for use in energy storage systems.
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Battery-pole connectors
Lever-actuated PCB terminal blocks and PCB connectors
New levels of convenience with LPT and LPC series PCB terminal blocks and PCB connectors.
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Lever-actuated PCB terminal blocks and PCB connectors
Board-to-board connectors
Robust FINEPITCH series board-to-board connectors.
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Board-to-board connectors
IDC female connector strips for BTB connectors
Preassembled IDC female connector strips with flat-ribbon cable for immediate use in the device.
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IDC female connector strips for BTB connectors
RJ45 jacks for PCBs
Reliable data transmission with various connection options such as SMD and wave soldering.
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RJ45 jacks for PCBs
Feed-through connectors
Our product range for PCB connectors offers a variety of connection options – from established screw connection and IDC fast connection to innovative Push-in Technology.
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Feed-through connectors
RJ45 jack insert
Reliable data transmission in a robust design, 10 Gbps, CAT6A special tool-free assembly thanks to IDC connection.
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RJ45 jack insert
Universal current measuring transducers
MCR current and voltage measuring transducers can be used to convert direct, alternating, and distorted currents and voltages into a standard analog signal.
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Universal current measuring transducers
Busbar connection
Connectors for connecting to the busbar simplify the installation of slide-in systems in energy storage systems.
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Busbar connection

Residential storage


Residential storage

Solutions for residential storage

Coupled with a photovoltaic system, energy storage systems play a huge role in homes. The proportion of self-generated electrical energy used in the household’s own electricity consumption is increased significantly. In the event of a fault in the public grid, it enables continuous, self-sufficient supply.

Current residential storage systems have a modular design. The user-friendly stack design enables quick and safe installation and also makes it easy to add more battery modules. Blind-mating hybrid connection systems are particularly suitable for this. They contain all the necessary connections for the storage modules and connect automatically when the individual modules are stacked.

Connectors for the Power Control Unit in the residential storage system

The Power Control Unit is the central control element of the residential storage system. It organizes the charging and discharging processes of the battery modules and ensures their safe operating state. To do this, it monitors currents and voltages and the temperatures inside the modules.

Interactive Image Map: Power control unit in residential storage systems
EtherCAT P
The DMCC 0,5 PCB connector features CAT5 transmission properties and EtherCAT P qualification.
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EtherCAT P
SPTAF series PCB terminal blocks with a low installed height
The low installed height of the SPTAF PCB terminal block is ideal for energy storage systems and flat modules.
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SPTAF series PCB terminal blocks with a low installed height
Board-to-board connectors
Robust FINEPITCH series board-to-board connectors provide shielded and unshielded solutions for signal and data transmission.
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Board-to-board connectors
Lever-actuated PCB connectors
Benefit from a new level of convenience with LPC series PCB terminal block connectors.
Find out more.
Lever-actuated PCB connectors
Feed-through connectors
Our product range for PCB connectors offers a variety of connection options – from established screw connection and IDC fast connection to innovative Push-in Technology.
Find out more
Feed-through connectors
RJ45 connectors
Compact RJ45 connectors and patch cables support high-speed data transmission of up to 10 Gbps.
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RJ45 connectors
Connectors for DC and AC cabling
The portfolio ranges from connection technology for photovoltaic panels, to DC connectors for field cabling, right through to device connections for signals, data, and power.
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Connectors for DC and AC cabling

Connectors for residential storage battery modules

Battery modules are the heart of energy storage systems. They contain battery cells in which the electrical charge is stored as chemical energy. Each battery module features cell balancing, which ensures that all the battery cells maintain an equal state of charge.

Interactive Image Map: Residential storage battery module
Lever-actuated PCB connectors
Benefit from new levels of convenience with LPC series PCB terminal block connectors.
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Lever-actuated PCB connectors
PCB terminal blocks and PCB connectors
Benefit from versatile connection technology solutions in different shapes, colors, and connection options as well as from our extensive development and manufacturing expertise for your individual connection solution.
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PCB terminal blocks and PCB connectors
Free sample
Order your personal sample

Would you like to test our connection solutions for energy storage? Order your free sample package and experience the convenient operation of our connectors first hand.

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Battery connectors

Core element of the All Electric Society


The key to a CO2-neutral society lies in the efficient use of renewable energy. Energy storage systems are the basis for this. The reliability and efficiency of the storage systems depend not least on the cabling and the electrical connections. They form the cardiovascular system of the energy storage concept.

Dr. Rüdiger Meyer - Phoenix Contact, Expert for energy storage systems
Dr. Rüdiger Meyer, expert for energy storage systems at Phoenix Contact

Dr. Rüdiger Meyer, expert for energy storage systems at Phoenix Contact

Questions and answers about energy storage systems The answers to a large number of questions are already available. Just take a look at our FAQs. Please email us if you cannot find a suitable answer.

Utility-scale storage
Sign “Security on Board”
Technician controlling energy storage systems
Assembly of a battery-pole connector
Connectors for energy storage
Utility-scale storage

Energy storage systems are used in a huge range of applications – for example, for providing electricity in the event of grid outages. Energy storage systems have an important role to play in the energy revolution, especially with the increased use of renewable energies. This is because renewables are not available at all times to meet demand. The supply of and demand for electrical energy are quite often out of sync. Energy storage systems can bring synchronization to this equation by storing excess electricity produced by solar power and wind power systems. Whenever the demand for energy from the grid is higher than that available, the energy storage systems can make this excess electricity available again.

Sign “Security on Board”

Despite occasional reports of fires or other accidents, battery energy storage systems do not pose any significant dangers. State-of-the-art battery energy storage systems are produced by the manufacturers in accordance with applicable directives and standards, and are installed and commissioned by specialists. That said, battery energy storage systems are also to be considered as devices and plants with a very high energy content. Dangerous conditions can arise in the event of unauthorized access, willful destruction, or circumvention of the safety measures and equipment. However, the manufacturers themselves take such scenarios into account with failure mode and effects analyses.

Technician controlling energy storage systems

As is the case with most technical devices and systems, battery energy storage systems should also be checked and serviced regularly. Depending on the storage media used, this maintenance work can be reduced significantly to just visual inspections, the tight fit of screw connections, and so on – as is the case with common lithium-ion batteries. With other systems, however, the amount of work can also be higher, for example in lead-acid batteries, where the electrolyte has to be checked and topped up regularly.

Assembly of a battery-pole connector

The Phoenix Contact battery-pole connectors can be plugged in and pulled out in any orientation. Moreover, they can be rotated through 360° when plugged in. This makes maintenance and troubleshooting so much easier. Moreover, it increases flexibility when designing the system.

Connectors for energy storage

Unintentional polarity reversal of the battery connection can cause enormous damage and, in the worst case, endanger life and limb. That is why Phoenix Contact battery-pole connectors are color-coded and mechanically coded. The positive pole only fits into the positive position, and the negative pole only into the negative position. Moreover, it is also ensured that the two polarities cannot be short-circuited. Because of the high energy content of a battery, a fault of this kind would cause the conductors to melt and would very likely result in a fire in the system.