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In the deep drawing of battery housings, microcracks in the corners are critical defects that compromise structural integrity. These cracks arise when local strain exceeds the material’s forming limits, directly weakening the housing’s ability to withstand mechanical impact and maintain airtightness. To systematically eliminate this risk, one cannot rely on a single adjustment alone; instead, it is necessary to start from the mechanical fundamentals of material flow and comprehensively optimize the constraint strategy and lubrication scheme for draw beads, thereby achieving precise control over metal flow. This article will explore in depth how this systematic engineering approach can ensure the stability and reliability of the deep drawing process for battery housings. Key Challenge: Maintaining Structural Integrity at the Fillet of the Battery Housing For functional components such as custom battery housings, the structural integrity of the fillet in deep-drawn corners is a fundamental prerequisite for their in-service performance. The danger of microcracks in this area lies precisely in their concealment—they […]

The battery housing serves as the structural backbone and primary protective barrier of an energy storage system, shielding highly sensitive battery components from mechanical shocks, temperature fluctuations, and environmental degradation. Among these threats, corrosion remains one of the most insidious failure mechanisms—it can compromise the housing’s integrity, leading to seal failure and ultimately triggering short circuits or thermal runaway events. The 1,000-hour neutral salt spray (NSS) test, in accordance with ASTM B117 or ISO 9227, has become the de facto qualification benchmark. Achieving this level of corrosion resistance for custom battery housings requires more than simply selecting a high-quality off-the-shelf coating. It demands a systematic approach that integrates forward-thinking design, rigorous pretreatment, and standardized process control. This article examines these stages from the perspective of battery housing manufacturing, identifying the sources of corrosion resistance—as well as the causes of failure. The 1,000-Hour NSS Benchmark Test and Its Significance for Battery Housings As defined by the ASTM B117 and ISO 9227

For electric vehicle battery packs, the flatness (or coplanarity) of the battery housing’s bottom surface is not merely a dimensional requirement; it is a functional prerequisite that directly affects the thermal management efficiency and structural integrity of the entire energy storage system. When deviations in the bottom surface of an EV battery housing exceed acceptable tolerance limits, the liquid-cooling plate cannot make tight contact with the bottom surface, creating air gaps that increase thermal resistance and reduce heat dissipation efficiency. At the same time, mounting brackets and cell modules are subject to uneven stress distribution, which accelerates fatigue in welded joints and compromises the long-term reliability of the battery pack. This article provides an in-depth analysis of the root causes of flatness deviations in battery housing manufacturing and proposes proven countermeasures to ensure consistent compliance with coplanarity requirements. Definition of Flatness Requirements: What constitutes an acceptable battery housing bottom? The acceptability of an EV battery housing bottom is defined by

Outdoor electric vehicle charging infrastructure faces a range of unique engineering challenges. Among the most commonly overlooked—yet critically important to operations—are water accumulation on the tops of EV charging station housings and screen glare caused by embedded human-machine interfaces (HMIs). These issues are not merely cosmetic; they directly impact equipment lifespan, user experience, and compliance. Water accumulation on the flat roof surfaces of custom EV charging station housings accelerates electrochemical corrosion at fastening points, exacerbates coating degradation, and increases the risk of moisture infiltration through seams and gaskets. In climates with freeze-thaw cycles, frozen water expands, potentially causing panels to warp and compromising seal integrity. At the same time, HMI screens installed flush with the cabinet’s exterior surface are unable to withstand direct sunlight, rendering the display unreadable under strong ambient light conditions, while rainwater flows directly over the touchscreen surface. The root cause of these failures lies in the failure to consider outdoor ergonomics during the sheet metal design

The electrification of the automotive industry has presented unprecedented challenges for battery housing manufacturing. Among the many quality considerations in production—including dimensional accuracy, weld integrity, and thermal management—there is one failure mode that is most easily overlooked yet can lead to catastrophic failures: sharp edges and residual burrs. In high-voltage battery systems, the insulating barrier between conductive components and the battery housing serves as a critical line of defense against electrical failures. When an EV battery housing has sharp edges or residual burrs resulting from processes such as stamping, laser cutting, or machining, vehicle vibrations and thermal cycling can cause these protrusions to penetrate the insulating film, separator material, or wiring harness sheath. The result is partial discharge, arcing, or catastrophic short circuits. Eliminating burr-related risks is not merely a cosmetic issue—it is a fundamental safety requirement that demands systematic engineering controls, clear specifications, and validated process capabilities. Battery Housing Burr Issues: Risk Assessment During the stamping, laser cutting, or

For high-voltage battery housings, the effectiveness of electromagnetic interference (EMI) and radio frequency interference (RFI) shielding is directly related to the system’s functional safety and reliability. Even the slightest shielding leakage can cause sensitive control circuits to malfunction or generate unacceptable interference with external communication devices. From a sheet metal manufacturing perspective, the core challenge in achieving a complete Faraday cage effect for custom battery housings lies not in material selection, but in eliminating potential structural conductive discontinuities through precise process control. Improper coating treatment of flange surfaces, ill-conceived fastener layouts, or insufficiently compressed conductive gaskets can all introduce gaps in what would otherwise be a continuous conductive path, creating sources of high-frequency leakage. This article will delve into these shielding failure modes caused by manufacturing processes, focusing on the entire workflow from prototype validation to mass production, and provide a set of practical engineering solutions to ensure that every battery housing meets its stringent electromagnetic compatibility (EMC) performance specifications.

The accelerated deployment of public charging infrastructure has exposed EV charging station housings to unprecedented physical risks—acts of vandalism such as minor vehicle collisions, blows from blunt objects, and forced entry via lock tampering directly result in equipment downtime and high repair costs. The IK10 protection rating defined by the IEC 62262 standard requires the housing to withstand an impact energy of 20 joules—equivalent to the impact force generated by a 5-kg object dropped from a height of 400 mm—while ensuring that the IP protection rating remains unaffected after testing and that the door operation and locking points remain undamaged. However, achieving IK10 compliance is not simply a matter of increasing material thickness. From the perspective of EV charging station housing manufacturing, the failure modes of 2.5 mm aluminum alloy and 1.5 mm stainless steel under impact are fundamentally different—aluminum absorbs energy through plastic deformation, while stainless steel faces the risk of cracking due to stress concentration. At the structural

As the global penetration rate of electric vehicles continues to rise, the deployment of outdoor charging infrastructure is proceeding at an unprecedented pace. EV charging station housings, serving as the first line of defense for protecting internal electrical components, are continuously exposed to corrosive environments such as rain, condensation, temperature cycling, and road salt spray. The bottom of the housing and the lower edge of the door panel are prime targets for corrosion—these areas are constantly exposed to capillary water absorption from concrete bases or accumulate salt-laden liquid splashed from the road. Once rust forms, it spreads rapidly, leading to coating peeling, reduced structural strength, and even compromising the safety of the internal electrical components. While the NEMA 250 and UL 50E standards provide a graded framework for environmental protection of outdoor electrical enclosures, issues such as insufficient corrosion resistance of the base material (e.g., standard SPCC), a lack of drainage design at the bottom, and inadequate pretreatment before coating