Modular battery pack design and serviceability in electric vehicles

The rapid growth of electric vehicles (EVs) has heightened the demand for battery systems that not only deliver high performance but are also efficient to maintain, scale, and recycle. While much of the industry’s focus has been on energy density and cost optimization, serviceability—defined by ease of maintenance, diagnostic accessibility, and component-level replacement—has emerged as a critical yet underprioritized factor. Traditional EV battery packs, often monolithic and tightly integrated, pose significant challenges for field technicians, including prolonged disassembly times, high-voltage safety risks, and limited diagnostic transparency. These limitations increase downtime, escalate service costs, and constrain the long-term sustainability of EV platforms. This paper explores the transformative role of modular battery pack design in improving serviceability and lifecycle efficiency across EV ecosystems. From a broader perspective, it examines how modularity facilitates streamlined maintenance workflows, safer handling procedures, and standardized replacement strategies. The analysis narrows to compare the design philosophies of leading OEMs such as Tesla, GM, Rivian, and Lucid, evaluating how different architectures impact field repairability and technician safety. Further sections explore the ripple effects of modular design on manufacturing automation, second-life reuse, and end-of-life disassembly for recycling. Emphasis is also placed on interface standardization, diagnostic system integration, and the need for interoperable service protocols. A real-world case study demonstrates how design decisions—such as interlock logic, balancing procedures, and module accessibility—translate into measurable service efficiency improvements. The paper concludes with strategic recommendations for advancing modular, service-oriented battery pack architectures that align with the evolving demands of sustainable, technician-friendly EV platforms.