Development of a Semantic Database Model to Facilitate Data
Analytics in Battery Cell Manufacturing
Ozan Yesilyurt
1a
, David Brandt
1b
, Julian Joël Grimm
1c
, Kamal Husseini
2d
,
Aleksandra Naumann
3,4 e
, Julia Meiners
3,4 f
and David Becker-Koch
5g
1
Fraunhofer Institute for Manufacturing Engineering and Automation IPA Nobelstraße 12,
70569 Stuttgart, Germany
2
Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany
3
Technische Universität Braunschweig, Institute of Machine Tools and Production Technology, Langer Kamp 19b,
38106 Braunschweig, Germany
4
Technische Universität Braunschweig, Battery LabFactory Braunschweig, Langer Kamp 8,
38106 Braunschweig, Germany
5
The Centre for Solar Energy and Hydrogen Research Baden-Württemberg, Lise-Meitner-Straße 24,
89081 Ulm, Germany
{al.naumann, j.meiners}@tu-braunschweig.de, david.becker-koch@zsw-bw.de
Keywords: Battery Cell Manufacturing, Database Model, Semantic Model Description.
Abstract: The global demand for batteries is increasing worldwide. To cover this high battery demand, optimizing
manufacturing productivity and improving the quality of battery cells are necessary. Digitalization promises
to offer great potential to address these challenges. Through data collection along the manufacturing processes,
hidden correlations can be identified. However, data is highly diverse in battery cell manufacturing,
complicating data analysis. A semantic data storage can increase the understanding of the relationships
between the datasets, facilitating the identification of the causes of defects in manufacturing processes. To
structure heterogeneous data in a semantically understandable and analyzable form, this paper presents the
development of a semantic database model. The realization of this model enables structuring various datasets
for simplified access and usage for increasing productivity and battery cell quality in battery cell
manufacturing.
1 INTRODUCTION
The global demand for batteries for energy storage is
growing due to the continued development of electric
vehicles and other mobile devices (Asif & Singh,
2017). The growing number of battery-electric
vehicles registered illustrates the increasing global
demand for battery cells (Carlier, 2021). To meet this
high demand of the battery cell users, digitalization of
production offers several opportunities to build a
a
https://orcid.org/0000-0003-3002-3230
b
https://orcid.org/0000-0003-1781-9541
c
https://orcid.org/0000-0002-0559-3752
d
https://orcid.org/0000-0002-7110-4697
e
https://orcid.org/0000-0002-9193-1294
f
https://orcid.org/0000-0002-6564-6537
g
https://orcid.org/0000-0001-5921-5768
flexible, intelligent, adaptable, and efficient
manufacturing system (Zhong, Xu, Klotz, &
Newman, 2017). Data is the key element to realizing
such manufacturing systems, and its availability has
been rapidly growing in the manufacturing industry
(Yin & Kaynak, 2015). Smart manufacturing targets
transforming data towards manufacturing intelligence
to positively affect every manufacturing-related
aspect (O’Donovan, Leahy, Bruton, & O’Sullivan,
2015).
Yesilyurt, O., Brandt, D., Grimm, J., Husseini, K., Naumann, A., Meiners, J. and Becker-Koch, D.
Development of a Semantic Database Model to Facilitate Data Analytics in Battery Cell Manufacturing.
DOI: 10.5220/0011139500003269
In Proceedings of the 11th International Conference on Data Science, Technology and Applications (DATA 2022), pages 13-20
ISBN: 978-989-758-583-8; ISSN: 2184-285X
Copyright
c
2022 by SCITEPRESS Science and Technology Publications, Lda. All rights reser ved
13
The use of data-driven manufacturing
technologies is appealing for battery cell
manufacturing to improve scrap and product quality.
Data in battery cell manufacturing is heterogeneous,
resulting from both converging and diverging
material flows, continuous and non-continuous
processes, and single and batch processes (Turetskyy
et al., 2020). On the one hand, it is essential to build
data storage in battery cell manufacturing to solve
heterogeneous data problems. It is challenging to
collect unstructured data from different
manufacturing processes and perform informative
analyses. On the other hand, it is a major gap in
battery cell manufacturing to create and enable
context-based data in a semantically understandable
way because heterogeneous data consists of different
unrelated datasets, which hinders identifying the
cause of manufacturing process issues and
discovering hidden optimization opportunities in the
manufacturing process.
A possible solution to address these challenges is
creating a semantic database with a model that
facilitates identifying, accessing and processing the
appropriate data. Semantically structured data
enables data scientists to track and evaluate the
manufacturing processes and find optimization
potentials in the battery cell manufacturing with
various analysis tools.
This paper aims to present the requirements for a
specific battery manufacturing scenario and present a
possible implementation of such a semantic database
model as a solution.
The following chapter describes the data storage
transformation. It also presents current data
challenges, introduces developed approaches to solve
them, and derives the scientific gap. Chapter 3
introduces the specific scenario for which the
semantic database model is created. The following
two chapters illustrate the model’s underlying
concept and its realization. The paper concludes with
a summary and highlights the future work with the
developed semantic database model.
2 RELATED WORK
Data is a key element for smart manufacturing to meet
manufacturing needs and inform manufacturing
decision-making areas (O’Donovan et al., 2015).
Relational databases have been used for decades as
regular database systems to store manufacturing data.
A relational database is a digital database used for
electronic data management in computer systems and
is based on a table-based relational database model as
proposed by (Codd, 1970). With the introduction of
IoT technologies, cloud computing, big data analytics,
and AI integrated into manufacturing systems, a high
level of multi-source and heterogeneous data is
generated (Tao, Qi, Liu, & Kusiak, 2018). Therefore,
more and more new database technologies were
integrated into the existing data storage architectures,
such as NoSQL. With these, the challenges associated
with storing the great amount of manufacturing data
could be adressed. NoSQL databases became widely
used around 2009, which process data faster than
relational databases because their data models are
built more simply (Leavitt, 2010). They can be
categorized into five groups (Column-based,
document-based, key-value-based, graph-based,
time-series-based) (Cui, Kara, & Chan, 2020; Yen,
Zhang, Bastani, & Zhang, 2017). The same big data
challenge is also observed in battery cell
manufacturing. Various systems (e.g. equipment,
controls and simulation models) are involved and
generate heterogeneous (e.g. time series, discrete)
data in large volumes. Data is distributed in several
heterogeneous datasets and databases that need to be
linked to enable in-depth analysis for identifying and
addressing issues in battery cell manufacturing
processes.
Some solution approaches are developed to
address this need. A hybrid framework for industrial
data storage to utilize zero-defect manufacturing was
introduced by (Grevenitis et al., 2019), where
unstructured data generated by the IoT devices are
processed in a NoSQL database (Apache Cassandra);
at the same, time the structured data is stored in a SQL
database (MySQL). Then, the filtered data from both
databases is converted into knowledge and stored in a
triplestore database to be used by experts.
Furthermore, (Hildebrand, Tourkogiorgis,
Psarommatis, Arena, & Kiritsis, 2019) developed a
generic algorithm for the automated conversion of
different data types into RDF. With this solution, the
researchers seek to enable data mapping without hard
coding. This solution is reusable across various data
schemas and ontologies, which can be easily
modified to fit other data formats. In addition,
(Wessel, Turetskyy, Wojahn, Abraham, & Herrmann,
2021) presented and implemented a methodology to
develop an ontology-based traceability system in
battery cell manufacturing so that the relations
between the data sources along the manufacturing
chain can be determined. Moreover, (Grimmel,
Wessel, Mennenga, & Herrmann, 2022) introduced
an ontology-based data processing that enables the
creation and distribution of knowledge from
decentralized and unstructured data such as
DATA 2022 - 11th International Conference on Data Science, Technology and Applications
14
warehouse static data, stock exchange data, energy
demand data, machine data and the production plan
of heterogeneous battery processes in a learning
factory. Furthermore, (Malburg, Klein, & Bergmann,
2020) developed 70 semantic web services based on
different ontologies for intelligent manufacturing
control to enable a near real-time verification for
executing cyber-physical workflows. Last, (Kalaycı
et al., 2020) created a framework in that
manufacturing data from the machines of the Bosch
company in Salzgitter for placing electronic
components and automated optical inspection are
semantically integrated to be used in quality analysis
tasks. However, the semantic representation (e.g.
relations between process parameters and mapping of
various discrete and time-series datasets from
equipment, simulation models, and controls) to
enable linked and structured datasets, which can be
used to analyze optimization potentials in the battery
cell manufacturing, has not yet been considered. The
next chapter presents the battery cell manufacturing
use case scenario adressed in this paper.
3 THE VIPRO PROJECT
The concept of the semantic database model for smart
battery cell manufacturing is embedded in the project
ViPro “Virtual Production Systems in Battery Cell
Manufacturing for cross-process production control”.
The project’s objective is to develop and validate a
concept of cross-process control with a virtual
production system. The concepts’ envisioned benefits
are an increase in battery cell manufacturing
productivity and an improvement in the quality of the
produced cells through an efficient operation.
Realistic and low-risk testing of optimization
measures shall be conducted in the virtual space.
Once satisfactory results are achieved, these measures
can be implemented seamlessly in the battery
manufacturing process.
The overall system architecture of ViPro consists
of different components shown in
Figure
1
. The superordinate systems intelligent
operation control and cross-process control are
connected and perform data processing. The
intelligent operation control system includes operator
interfaces, where target conditions can be entered and
relevant data for decisions is displayed. The cross-
process control contains machine learning algorithms
evaluating process control values based on
intermediate product features of preceding process
steps.
Figure 1: ViPro overall system architecture.
Product features are evaluated within the single
process models of the virtual production system based
on the respective process input parameters. The
virtual production system includes coating, stacking,
electrolyte filling, and formation quality prediction
models. All of the virtual process representations
have a corresponding physical system: the coating
machine of the ZSW “research platform for the
industrial production of large lithium-ion cells”, the
stacking machine of the KIT “Battery Technology
Center”, the electrolyte filling unit of the TU
Braunschweig “Battery LabFactory Braunschweig”,
and the formation equipment of the Fraunhofer IPA
“Center for Battery Cell Manufacturing”.
To enable communication between the different
ViPro components, Virtual Fort Knox (VFK) is
implemented as a cloud IoT platform together with
the communication middleware Manufacturing
Service Bus (MSB) (Schel et al., 2018). The
connection from the physical equipment to the VFK-
platform is carried out with Station Connector
(Defranceski, 2021), which enables a control-
independent communication.
To enable and ensure communication between the
different services models, the intelligent operation
control and cross-process control systems, a
representation of the information structure of the
underlying complex process behavior and
relationships, as well as the heterogeneous data, is
needed. This representation of the information
structure builds up a network between the different
services enabling operable communication and direct
data exchange. Furthermore, continuous data
exchange from the physical production equipment is
needed to evaluate the potential for cross-process
control. To address these challenges the semantic
database presented in this paper is developed and
integrated into the ViPro overall system architecture.
Development of a Semantic Database Model to Facilitate Data Analytics in Battery Cell Manufacturing
15
Figure 2: Semantic database concept.
4 SEMANTIC MANUFACTURING
DATABASE CONCEPT
The concept described in this paper aims to develop a
semantic database that structures heterogeneous data
in a semantically understandable and analyzable form,
enabling a solid data foundation to analyze and
optimize battery cell manufacturing. First, the
requirements for developing this database concept are
identifieed, and then the designed concept is
introduced. After that, the semantic database model is
described, consisting of the semantic description of
the four simulation models considered in the ViPro
project. Then, it is explained why the considered
simulation models require this semantic database
model and which quality and general parameters of
this database model are relevant for the simulation
models. Last, the requirements of the intelligent
operation control and cross-process control systems
are introduced. These requirements define what kind
of datasets they need from the semantic database and
which features the semantic database should
additionally have.
The following general requirements have been
identified collaboratively with the project´s process
engineers for the semantic database in the ViPro
scenario:
Different heterogeneous data from the models,
equipment, and control systems such as
experiment, equipment’s process data
(measurement data), and recipe data should be
stored digitally.
The data should be easily accessible and
trackable.
The relationships between different process
parameters of the simulation data should be
representable.
The data from the equipment should be stored
in a time frame of one-second intervals.
The data from the equipment should be linked
to the data from the simulation models.
The database system should be centrally
provisioned and enable access for all partners
involved (e.g. via virtual private networks)
and the possibility to operate across processes.
The database should provide the interfaces so
that required data can be processed via these
interfaces by other IT systems in the ViPro
project
To cover the requirements, the proposed solution
is a combination of several databases for the different
types of data and a service that manages the
referencing of the data (see Figure 2). Since the
relationships between the different types of data and
their underlying knowledge need to be stored, a
knowledge graph is used to store data. A knowledge
graph represents a self-describing knowledge base
that stores data and its schema in a graph format and
illustrates their relationship (Fensel et al., 2020). A
graph database is used in this paper to store the
knowledge graph. Due to the requirements of storing
DATA 2022 - 11th International Conference on Data Science, Technology and Applications
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and accessing data in real-time, a time-series database
(TSDB) is used. The TSDB stores the data with an
additional tag such as experiment ID to reference the
experiment data, stored in a graph database. The
graph database stores this reference key (experiment
ID) to describe the simulation data semantically. With
this design, the service can store different forms of
data and respond to other ViPro IT systems’ requests.
A middleware enables fast and low-overhead
integration of smart objects and IT services (e.g.,
equipment, simulation models, and database service).
Therefore, a middleware that understands different
protocols is used to access the data and to connect to
the database service.
After introducing the designed concept for the
semantic database, the semantic database model is
described below. A semantic database model is
required to identify the relations between the
heterogeneous stored datasets in databases so that
they can be easily exported from databases with their
linked information to analyzing tools.
Communication between the different services
models, the intelligent operation control, and cross-
process control systems must be ensured. Therefore,
data has to be transferred fast from and to the database.
Figure 3: Semantic database model description.
Furthermore, the simulation models' heterogeneous
input and output data need to be considered. That is
time-series data from the process execution and
control data from the cross-process control and the
intelligent operation control systems. To do so, a
representation of the information structure of the
simulation models concerning behavior and
relationship has to be implemented in the semantic
database. This representation of the simulation
models’ information structure is the semantic
database model. It is developed based on the
description of the four simulation models considered
in the ViPro architecture and described in the
following paragraphs.
Figure 3 shows the structure of the semantic
database model description. Various experiments are
carried out in which data of input and output
parameters are stored in the graph database. Each
experiment contains the considered battery cell
manufacturing processes. The input data are divided
into general input parameters and control parameters.
The general input parameters include, for example,
material parameters and specifications regarding the
cell format, whereas the control parameters include
the setting parameters on the respective production
machine. The output parameters are further
subdivided into general output parameters and quality
parameters. The general output parameters include
values that each process step contains. These are, for
example, statements about the energy requirements of
the process and the throughput. The quality
parameters provide information about the respective
intermediate product properties or process quality.
The structure described can be transferred into a data
exchange format such as JSON or XML.
Four processes of battery cell manufacturing are
considered for the semantic description of the models,
which need to be integrated into the overall system of
cross-process control: Electrode coating, assembly,
electrolyte filling, and formation. The models are
based on different approaches, and each of them
focuses on specific key quality parameters.
The model of the electrode coating process is
based on historical data. A Kernel density estimation
is used to determine the relationships between input
and output parameters and tested via cross validation
and optimized with a grid search (Hasilová & Vališ,
2018). The key parameter of this model is the coating
weight per unit area, which has a major impact on
final cell performance. The next model considers the
process of cell assembly. For this purpose, a
simulation is implemented using Simcenter Amesim,
which depicts the separation of electrodes and the
stacking process. In particular, the target web tension
Development of a Semantic Database Model to Facilitate Data Analytics in Battery Cell Manufacturing
17
Figure 4: Semantic database components.
and the web speed are the parameters that determine
the final dimensional accuracy of sheets. Furthermore,
the electrolyte filling of battery cells is considered.
Due to the lack of quality data on the filling process,
known historical relationships of various publications
are used to map the process. The amount of
electrolyte filled in is a decisive factor in determining
the quality parameter wetting degree. The last model
represents the process of formation. It is implemented
as a grey-box model in MATLAB/Simulink and
consists of a discrete-event-simulation and a database
model part. The key parameters of the formation
process equal the parameters for final cell
performance, which are cell capacity and efficiency.
To access data fast, the described structure of the
database needs to be built up logically and according
to the intelligent operation control and cross-process
control systems that work together closely. They both
need similar individually compiled datasets for
different applications. One important requirement is
that certain data types can be extracted from other
experiments. For the human-machine interface, the
control and machine learning modules, default
datasets of process parameters, and historical and
real-time data are needed from the database and the
cross-process control system, respectively. The
datasets are used for monitoring and decision support.
Since the intelligent operation control system should
be able to access and present all types of data related
to the whole manufacturing process, including
different analyses, the interfaces must be defined and
designed accordingly.
5 IMPLEMENTATION
This chapter introduces the selected database
software systems first. Then, the realization of the
database systems for ViPro is described. At last, it is
examined whether this realization fulfills the
predefined requirements and can be implemented in
all battery cell manufacturing processes.
Neo4j is used as a graph database for storing the
model data and its references to the control data and
equipment data in a synchronized manner. The
determining factor was Neo4j’s numerous advantages
in points of performance, flexibility, and
interoperability.
The process data of four different ViPro equipment
should be stored in one-second intervals in a database.
According to the executed benchmark and the test
results of (Hao et al., 2021), InfluxDB has the best
compression performance, the highest performance at
writing data at high concurrency and handles queries
faster compared to the other three TSDBs.
The realization of the database systems for ViPro
is illustrated in Figure 4. A database service with
InfluxDB and Neo4j connectors which can process
data according to the relevant database, was
developed and implemented. It is called Semantic
Database Query Engine (SDQE). Using the Neo4j
connector, the SDQE can store the simulated model
data in a knowledge graph, as shown in Figure 2. The
InfluxDB connector was developed in SDQE for
storing the control and equipment data. The SDQE
controls the underlying data with the service layer and
decides which data structure is stored in which
database. An application programming interface
(API) layer was defined that can process the
requests from the MSB middleware and the databases.
According to the defined data structure in Figure
3, a schema was created in Neo4j. The structure in
Figure 5 shows the different information and their
relationships. It shows that the "Experiment" node is
connected to the "Process" node, which in turn may
have the "InputParameter" and "OutputParameter"
nodes. The parameter nodes then store the value and
its reference to the TSDB. The "Unit" node is not
DATA 2022 - 11th International Conference on Data Science, Technology and Applications
18
stored directly in the parameter to make the nodes as
atomic as possible for better scalability.
As described above, the implementation solution
consists of a Neo4j graph database and Influx TSDB.
Neo4j graph database contains the data of simulation
models, while InfluxDB allows storing the data from
the equipment and control systems. To query these
databases, two database interfaces with InfluxQL and
GraphQL were developed in the SDQE. Furthermore,
every stored data is identified with a reference key in
both databases so that the data from the databases can
be accessed and used more efficiently. The data
stored in the Neo4j graph database is built after the
semantic database model description. This design
aims to visualize the relationships of the simulation
data with each other and to create a fundamental
database for further analysis.
Figure 5: Data schema in Neo4j.
Moreover, both databases are deployed in a cloud
platform so that only certain services and users have
access to these systems via VPN. In addition, the first
tests are performed with the equipment. The
equipment's process data (measurement data) can be
read out in a one-second time cycle and stored with a
tag (experiment ID, which is created by the Neo4j
graph database) in the InfluxDB.
The proposed semantic database model is a generic
model for all battery cell manufacturing processes.
Only the input and output parameters should be
adjusted for the new manufacturing processes. Thanks
to the Neo4j IT architecture, new processes can be
easily added to the database with new input and output
parameters. Additionally, the equipment data of the
new processes can be stored in the InfluxDB as new
measurements. With a new reference key, which
SDQE creates, the data from Neo4j can be linked to the
equipment data from the InfluxDB.
6 CONCLUSIONS
A semantic database with a model is developed
considering the ViPro use case for smart battery cell
manufacturing. First, requirements that enable
managing heterogeneous data in a semantically
comprehensible and analyzable format are identified.
Then, the designed concept is introduced. Last, the
realization of two different database technologies and
a connecting middleware was presented.
The developed concept shows that the
heterogeneous data from the simulation models,
equipment, and controls can be stored in a
semantically understandable way. Various datasets
are linked and structured for all manufacturing
processes, which can be used later to analzye and
exploit battery cell manufacturing optimization
potentials. In future work, the communication
solution is built for the ViPro use cases so that the
ViPro IT-components exchange data with each other
and retain the data as in the created concept. Future
developments can include the inclusion of further
processes and models or a transfer to different use
cases and industries.
ACKNOWLEDGEMENTS
This research was conducted within the scope of the
project “Virtuelle Produktionssysteme in der
Batteriezellfertigung zur prozessübergreifenden
Produktionssteuerung” (ViPro). The authors
gratefully acknowledge the financial support of the
German Federal Ministry of Education and Research
(BMBF). D.B.-K. would like to thank Steffen
Stökler-Thurn for the introduction to the subject and
the support.
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