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Siemens presents the new variable BZM evo series for underwater applications

With the compact BZM evo, Siemens can integrate fuel cell modules also into unmanned underwater vehicles.

In these fuel cell plants, the BZM evo modules are connected individually via DC/DC converters to the onboard power supply. With this type of connection, which allows controlling the operation of single modules and secondly increasing the degradation rate of the entire fuel cell plant, the supply of electrical energy to the onboard power grid is more flexible than with previous systems. In addition, the optional integration of backup modules increases redundancy within the plant and therefore improves system availability too.
The evolutionary innovative concept of the BZM evo series can be integrated into various applications. In addition to the conventional operation inside AIP submarines, the compact module design also supports the integration of individual BZM evo modules into unmanned underwater vehicles (UUVs). With this application, in which power ranges from 10 to 60 kW are expected, Siemens can now provide a complete energy system comprising battery, fuel cell module, media storage and control system. Initial system tests using a BZM34 from series production were completed successfully on land last year in the USA.
The BZM evo is a further optimized system from the SINAVY Fuel Cells series, which was originally designed in close cooperation with the German Navy and HDW over 20 years ago. Continuous feedback from the crews of operating AIP submarines which use the BZM34 and BZM120 has been extremely helpful for the optimization of the plant.
With a considerable weight reduction, the new module series is easier to handle and quicker to transport within a submarine. The optimized module replacement process now takes just a few hours and ensures uncomplicated and fast mounting, while the plug and play installation supports easy module commissioning.
The new BZM evo series is available both for new systems and for refitting older AIP plants and should be available on the market from 2023, or a year earlier for UUV integration.
For further information on Marine Solutions, please see

For this press release

Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for more than 170 years. The company is active around the globe, focusing on the areas of electrification, automation and digitalization. One of the largest producers of energy-efficient, resource-saving technologies, Siemens is a leading supplier of efficient power generation and power transmission solutions and a pioneer in infrastructure solutions as well as automation, drive and software solutions for industry. With its publicly listed subsidiary Siemens Healthineers AG, the company is also a leading provider of medical imaging equipment – such as computed tomography and magnetic resonance imaging systems – and a leader in laboratory diagnostics as well as clinical IT. In fiscal 2018, which ended on September 30, 2018, Siemens generated revenue of €83.0 billion and net income of €6.1 billion. At the end of September 2018, the company had around 379,000 employees worldwide. Further information is available on the Internet at .
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Stefan Rauscher

Siemens AG

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