Battery Pack Principal Design Engineer

Breathehr; Coventry; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

Breathehr is seeking a Battery Pack Principal Design Engineer to lead the design of battery modules and packs across automotive, marine, defence and industrial sectors. The role involves enclosure design, thermal management and integrating high/low voltage components while meeting standards.

You will collaborate with systems, thermal, electronics and EDS teams, manage BOMs and supplier interfaces, and support rapid prototyping and production projects from Coventry or Prague with some remote

Qualifications

• Degree in automotive, electrical/electronic or mechanical engineering.
• 5+ years of packaging and modelling battery modules and packs in prototyping and production.
• Experience creating 2D component drawings and 3D assembly drawings.
• Experience maintaining 3D electrical component database/catalogue.
• Experience of thermal management including liquid cooling.
• Advanced CAD capabilities (SolidWorks / CATIA / NX).

Responsibilities

• Collaborate with systems, thermal, electronics and EDS teams to develop modern battery module solutions.
• Design enclosures with battery cells and mechanical fixings to support modules and harnesses.
• Create 2D drawings from 3D models and designs.
• Develop 3D wiring harness models within the enclosure.
• Manage thermal interfaces and cooling components.
• Support manufacturability and cost through supplier collaboration.
• Manage component databases and BOMs, adhering to change control processes.
• Deliver tasks and report progress against milestones.

Skills

Battery design

CAD SolidWorks

Thermal management

2D/3D drawings

LV/HV wiring

Education

Degree in engineering

Tools

SolidWorks

CATIA

NX

Job description

Battery Pack Principal Design Engineer (VRF-098)

UK & Prague

Vacancy listed 13/10/2026

Details

Role Purpose:

We require a Battery Pack Principal Design Engineer to design battery modules and packs for a range of applications across multiple industry sectors, including but not limited to, automotive, marine, defence and industrial. The successful candidate will lead battery module and pack design and package battery cells as well as custom and off-the-shelf electrical/electronic components, external connectors, low-voltage harnesses and high-voltage/current interconnect into custom or modified enclosures, dealing with cooling requirements and meeting relevant industry standards and produce cost-effective and manufacturable designs. They will liaise with suppliers and manufacturers and work with the wider multi-disciplinary engineering team to support the delivery of effective engineering solutions.

Key Responsibilities:

• Work closely with the systems team, thermal team, electronics and EDS team and other engineering disciplines, to develop modern, innovative, and practical battery module and pack solutions
• Design of enclosures with battery cells, electro-mechanical component package modelling and associated mechanical fixings, etc. to support modules and harnesses.
• Design of solid components from folded sheet metal, machined solid or 3D printed plastic
• Production of 2D manufacturing drawings from 3D models and designs
• Develop 3D wiring harness models within the enclosure
• Management of thermal interfaces such as cooling fins, liquid flow-through cold plates and vapour chambers
• Support Design for Manufacture reviews and work with suppliers and manufacturing partners to optimise designs for manufacturability and cost
• Develop and manage component database for electrical components for 3D packaging
• Manage assembly structures and BOMs, adhering to company engineering change control processes
• Delivery of engineering tasks and reporting of progress and issues in line with project milestones.

Qualifications, Experience and Skills Required:

• Degree or similar in automotive, electrical/electronic or mechanical engineering
• Extensive experience (5 years+) relevant design experience of packaging and modelling of battery modules and packs gained across multiple projects in a prototyping and production environment.
• Experience of creating 2D component drawings and manufacturing assembly drawings
• Experience of creating and maintaining 3D electrical component database/ catalogue.
• Experience of thermal management techniques including liquid cooling
• Advanced capabilities in CAD software tool e.g., SolidWorks Catia V5/V6 or NX.

Preferred:

• Experience of working in a relevant industry (such as automotive, rail, marine, energy storage aerospace)
• Experience of design of electrical assemblies and components and LV & HV wiring harnesses
• Experience of high voltage busbar/PDU design and required creepage/clearance rules
• Understanding of structural / stress / finite element analysis
• Advanced knowledge of SolidWorks CAD suite.

System or Knowledge:

• Knowledge of GT&D and the correct application into component manufacturing drawings.
• Knowledge of relevant material science including thermal properties, corrosion resistance (including galvanic corrosion), strength and durability.
• Understanding of mechanical manufacturing processes and Design for Manufacture/Assembly
• Understanding of tolerance analysis

Personal Attributes:

• Quality-focussed with an attention to detail
• Flexible and enthusiastic
• Good problem solving and analytical skills
• Strong communication skills – including report writing and presentation
• Self-motivated and enjoys working within a team environment
• Willingness to accept responsibility and challenges required to achieve objectives Commitment to professional development and continuous learning

Location and Travel:

• You must be eligible to work in the UK or CZ and have no restrictions for world-wide travel.
• You must be able to pass UK DBSS check and be willing to work on Defence sector projects.
• This role is based at our Head Office in Coventry, UK, or our Engineering Office In Prague, Czechia, with flexibility for remote working.
• Standard working hours are 0900 to 1700, 5 days a week, however some travel may be required, and flexible working patterns are essential to the role.