Welcome back to The Battery Buildout.
In Part 1 (Project Master Planning and Process Design, Episode 01-08), we covered the decisions that define what the factory must do: the overview, the cell blueprint, the process route, the yield architecture, the material and energy balance, the site layout, the micro-environment, and the safety design. Part 2 (Equipment Selection & Digital Architecture) begins at Episode 09, last episode 11 we discussed long-lead equipment and logistics. This edition addresses what the factory must digitally prove: the IT/OT and MES data backbone architecture that connects every process step to every compliance obligation. This is not an IT project. It is a factory design decision—and it must be made before the first piece of equipment is ordered.
Table of Contents
1. The Regulation That Changed Factory Architecture
The EU Battery Regulation (EU) 2023/1542 is not only a product regulation; it also shapes factory-level data architecture.
From 18 February 2027, every electric vehicle battery, LMT battery, and industrial battery with a capacity above 2 kWh placed on the EU market must have a Digital Battery Passport. The European Commission’s guidance document, updated in August 2026 (Version 2.0), structures the required data into 71 data points across five categories. Depending on battery type and applicability, a subset of these data points will be mandatory at the February 2027 deadline. The passport is accessed via a QR code on the battery, and the record behind it must remain accessible for the battery’s lifetime under the responsibility of the economic operator placing the battery on the EU market.
For factory planners, the critical implication is this: the battery passport requires data that originates at every process step, from slurry mixing to formation to final testing. If the factory's IT/OT architecture was not designed to capture, structure, and transmit that data, no amount of post-construction IT investment can fully compensate. The data must be born digital, at the point of creation.
Then how can we realize this?
2. The ISA-95 Framework: Where MES Sits and Why It Matters
The international standard ISA-95 (IEC 62264) provides the functional hierarchy model for integrating enterprise systems with manufacturing operations. It defines the layers from Level 0 (physical process) through Level 4 (enterprise resource planning), with MES operating at Level 3 (manufacturing operations management).
Research on greenfield battery manufacturing lines confirms that ISA-95 provides a good guideline for MES design, though the underlying data model must be adapted to the specific requirements of battery production. The ISA-95 framework clarifies which data belongs where, which systems own which functions, and where the interfaces between IT and OT must be defined.
The architectural implication is that MES is not a standalone system. It is the orchestrator between the shop floor (PLC, SCADA, sensors) and the enterprise (ERP, PLM, supply chain systems). If the MES architecture is designed as a bolt-on after equipment selection, the factory will have data silos that cannot be integrated—and a battery passport that cannot be populated.
Then is MES enough? Let’s dive into this discussion.