Battery Pack Design
Battery pack design brings together many interdependent decisions: cell selection, electrical architecture, thermal management, structural components & mechanical packaging, safety strategy, BMS integration, ease of manufacture, and cost. A change in one area can affect the performance, lifetime, safety, and commercial viability of the full system.
UnityVolt Solutions helps simplify this process by translating complex technical requirements into a clear engineering pathway. Working with experienced engineering design and analysis partners in the US and India, we support battery pack development from concept through to prototype build, validation, and manufacturing readiness.
Requirements, Use Cases & Design Targets
A robust battery design starts with a clear understanding of how the system will actually be used. We help define the technical and commercial requirements that guide cell selection, pack architecture, validation planning, and manufacturing readiness.
- Application requirements for EV, BESS, marine, industrial, or custom battery systems
- Energy, power, voltage, current, and runtime targets
- Duty cycles and AC/DCFC charge profiles
- Operating environment, thermal limits, and cooling requirements
- Lifetime, degradation, and warranty expectations
- Safety, abuse tolerance, and regulatory constraints
- Cost, manufacturability, and serviceability targets
- System-level trade-offs across performance, safety, lifetime, integration, and cost
This gives the project a clear engineering basis before committing to a cell supplier, pack architecture, or prototype build.
Our Approach
We begin by understanding your application, use cases, operating environment, safety targets, warranty expectations, and commercial constraints. From there, we help define a practical pack solution for e-mobility, BESS, and custom applications, balancing system-level trade-offs across energy, power, weight, safety, lifetime, manufacturing complexity, and cost.
This gives clients a structured route from early requirements and cell selection through to a credible, testable, and scalable battery pack design.
Cell Selection & Supplier Benchmarking
Cell selection is one of the most important decisions in battery pack development. We help compare candidate technologies, suppliers, and datasheet claims against the real performance, safety, lifetime, quality, and commercial needs of your application.
- Cell chemistry, format, and supplier options
- Energy density, power capability, and rate performance
- Cycle & calendar life, and self-discharge
- Thermal behaviour, abuse tolerance, and safety characteristics
- Cell-to-cell variation, supplier Cpk/Ppk, and production consistency
- Cost, availability, scale-up risk, and supply chain suitability
- Independent benchmarking test plans under application-relevant conditions
This helps clients avoid relying solely on supplier datasheets and select cells based on realistic system-level trade-offs.
Pack Architecture & Mechanical Design
Once the application requirements and cell options are understood, the pack architecture can be developed around the required energy, power, voltage, current, safety, thermal, mechanical, and integration constraints.
- Series/parallel configuration and pack voltage architecture
- Module and pack layout concepts
- Busbars, interconnects, fusing, contactors, and protection strategy
- Current paths, sensing points, wiring, and communications architecture
- Mechanical packaging, enclosure concept, tolerances, ingress protection, and serviceability
- Cell spacing, compression strategy, thermal pads, gap fillers, and interface materials
- Cooling approach, temperature uniformity, and thermal interface considerations
- Thermal barriers, flame-retardant materials, venting paths, and thermal propagation mitigation strategy
- System integration with the vehicle, BESS container, charger, inverter, or host equipment
- Early design review for safety, manufacturability, testability, and cost
For detailed CAD, FEA, CFD, structural analysis and prototype engineering, we work with experienced design partners while providing battery-specific technical direction and independent review.
Electro-Thermal, Safety & Lifetime Analysis
We help assess whether a proposed design can meet performance, lifetime, safety, and warranty requirements under real operating conditions using a combination of testing and simulation tools.
Thermal strategy is a key system-level trade-off. For example, higher thermal set points may improve cooling efficiency and reduce auxiliary energy demand, but can accelerate degradation if cells operate at elevated temperatures for longer periods.
- Heat generation estimates during charge, discharge, and duty-cycle operation
- Cell, module, and pack thermal behaviour
- Temperature gradients, hot spots, and temperature uniformity
- Cooling strategy comparison and thermal set-point definition
- Temperature sensor placement and monitoring strategy
- Usable energy, power capability, and derating behaviour
- Degradation, lifetime, and warranty-use-case assessment
- Sensitivity studies across temperature, C-rate, SoC window, duty cycle, and operating environment
Accurate testing and modelling work identifies key design trade-offs, and whether the proposed design has sufficient margin to meet the required performance, lifetime, and safety targets before committing to prototype builds.
BMS Hardware & Software
The Battery Management System is the control and protection layer of the pack, using voltage, current, and temperature data to manage safe operation of the battery. In larger packs, this typically involves local monitoring units coordinated by a master BMS.
- Voltage, current, and temperature sensing
- BMS hardware architecture and sensing locations
- SOC, SOH, SOP, and RUL estimation requirements
- Cell balancing strategy
- Diagnostics, fault detection, and event logging
- Communications, data logging, and cloud connectivity requirements
- Isolation monitoring and electrical protection
- Safe operating limits, derating logic, and control strategy
- Thermal runaway detection and safety response logic
- Anomaly detection and failure-mode considerations
This helps ensure the BMS is properly aligned with the electrical, thermal, mechanical, safety, and lifetime requirements of the battery system.
Where required, we work with specialist partners to support integration of both off-the-shelf and bespoke BMS hardware and software solutions.
Prototype Testing, Validation & Certification Planning
Once the pack design has been defined, the next step is to build and test a physical prototype. We help advise on prototype build strategy, test article definition, and validation planning, and can work with specialist partners to support prototype build and testing where required.
- Prototype build strategy and test article definition
- Prototype design and build support through specialist engineering partners
- Cell, module, and pack validation plans
- Performance, lifetime, thermal, and environmental testing
- Abuse, safety, and fault-response testing
- Supplier qualification and independent benchmarking tests
- Design verification testing against customer requirements
- Certification planning and standards alignment
Relevant standards may include:
UN 38.3, IEC 62660, IEC 62619, UL 2580, UL 9540A, SAE J2464, and ISO 12405, depending on the application, market, and product level.
This helps clients move from concept review to physical validation with a clearer engineering pathway.
Prototype Testing, Validation & Certification Planning
Once the pack design has been defined, the next step is to build and test a physical prototype. We help advise on prototype build strategy, test article definition, and validation planning, and can work with specialist partners to support prototype build and testing where required.
- Prototype build strategy and test article definition
- Prototype design and build support through specialist engineering partners
- Cell, module, and pack validation plans
- Performance, lifetime, thermal, and environmental testing
- Abuse, safety, and fault-response testing
- Supplier qualification and independent benchmarking tests
- Design verification testing against customer requirements
- Certification planning and standards alignment
Relevant standards may include:
UN 38.3, IEC 62660, IEC 62619, UL 2580, UL 9540A, SAE J2464, and ISO 12405, depending on the application, market, and product level.
This helps clients move from concept review to physical validation with a clearer engineering pathway.
From Concept to Validated Prototype
Battery pack design is an iterative process. Requirements, cell selection, pack architecture, thermal strategy, BMS requirements, safety considerations, and validation results all influence each other, so earlier decisions often need to be reviewed as the design matures.
UnityVolt Solutions helps clients move through this process in a structured way, from use-case definition and cell selection through to pack architecture, electro-thermal and lifetime analysis, BMS requirements, prototype build, and validation planning.
Once the prototype design has passed the agreed success criteria, we can work alongside your chosen manufacturing partner to support a smooth transition towards scale-up and production readiness.