Contexte du projet
With the rapid expansion of electric mobility and renewable energy storage systems, a leading battery technology manufacturer launched a targeted customization project in 2026 for battery pack enclosures. These enclosures are critical for protecting internal battery modules, BMS (Battery Management System) components, and wiring, requiring stable performance in both mobile and stationary applications.
Les principales exigences comprenaient :
- Résistance à la poussière et à l'eau IP54
- Tolérance dimensionnelle ≤±0.03mm
- Dissipation de chaleur efficace pour un fonctionnement continu
- Lightweight design for enhanced energy efficiency
- Compatibility with standard battery modules and mounting hardware
- Qualité stable de production par lots
- Durable, corrosion-resistant surface finishes for long-term use
Sanjun Hardware was selected for its precision sheet metal technology, professional heat dissipation design, and proven track record in industrial battery enclosure customization.
Processus de fabrication des composants de base
The battery pack enclosure consists of the main enclosure, top ventilation cover, front connector panel, and mounting brackets. All production follows ISO 9001 quality standards and industrial battery enclosure specifications.
1. Sélection des matériaux & Pré-traitement
- Main enclosure & panels: 1.2mm aluminum alloy sheet, providing high strength-to-weight ratio, excellent thermal conductivity, and natural corrosion resistance.
- Pre-treatment: Fully automated ultrasonic degreasing, derusting, and chromate conversion coating to create a clean, high-adhesion surface base ideal for subsequent finishing.
2. Artisanat de fabrication de base
- Precision Laser Cutting: 8000W fiber laser cutter with ±0.02mm tolerance, using nitrogen assist gas to minimize heat distortion and maintain material integrity. This ensures accurate cuts for ventilation holes, connector cutouts, and mounting slots.
- CNC Bending & Forming: 9-axis CNC bending machine with custom jigs, ensuring springback ≤0.02mm and consistent structural dimensions. This is critical for the precise alignment of internal components and the tight fit of the enclosure.
- Precision Hole Processing: Laser positioning and CNC punching technology are used to ensure the accuracy of component mounting holes, connector openings, and ventilation slots within ±0.01mm. This guarantees seamless integration with internal battery modules and BMS components.
- Heat Dissipation Structure: Precision-punched honeycomb ventilation holes on the top and side panels, designed to optimize airflow and maintain optimal operating temperatures for internal battery components.
- Surface Finishing: Clear anodized coating applied to the aluminum enclosure, offering enhanced corrosion resistance, improved thermal conductivity, and a durable, non-conductive surface for electrical safety. Coating thickness is strictly controlled at 10–15μm for uniform coverage and long-lasting protection.
- Assembly & Sealing: High-density foam gaskets embedded in the enclosure seams to ensure a tight seal. Reinforced mounting brackets with precision holes are integrated into the enclosure for secure installation, while snap-fit locking tabs enable quick and reliable assembly of internal components.
3. Contrôle de qualité & Tests
- Dimensional inspection: CMM measurement to confirm tolerance ≤±0.03mm and compatibility with standard battery modules.
- Test de protection IP54: test de résistance à la poussière et à l'eau selon les normes IEC 60529.
- Test de dissipation de chaleur: imagerie thermique pour vérifier le flux d'air efficace et le contrôle de la température sous pleine charge.
- Connector fit test: Assembly testing with the client’s battery connectors to ensure seamless fit and electrical integrity.
- Inspection fonctionnelle complète: inspection à 100% avant livraison pour zéro défauts.
Défis du projet et Solutions
1. Défi: Équilibrer la dissipation de chaleur et la protection contre la poussière
The battery pack requires efficient airflow to prevent overheating, while also needing to protect internal components from dust and debris common in industrial environments.
Solution: We designed a multi-layer ventilation system with precision-punched honeycomb holes and removable dust filters, allowing for optimal airflow while preventing dust ingress. Each enclosure undergoes airflow testing to ensure performance meets specifications.
2. Challenge: Lightweight Design with Structural Integrity
The enclosure must be lightweight to enhance energy efficiency, yet strong enough to support heavy internal battery modules and withstand mechanical shock.
Solution: Through finite element analysis (FEA), we optimized the internal structure with lightweight reinforcing ribs, improving structural strength by 25% without increasing the overall weight.
3. Défi: Cohérence élevée dans la personnalisation par lots
The customer required 1,200 units with uniform appearance, size, and performance across all units.
SolutionLes lignes de production automatisées et le contrôle statistique des processus (SPC) sont utilisés pour surveiller les paramètres de traitement en temps réel. L'inspection d'échantillonnage est effectuée par 50 unités pour assurer la stabilité de la taille, de la finition de surface et des performances fonctionnelles.
4. Challenge: Compatibility with Standard Battery Modules
The enclosure must seamlessly accommodate standard battery modules and BMS components.
Solution: We used laser positioning technology to ensure the accuracy of mounting rails and component slots within ±0.01mm. Pre-production sample assembly was conducted with the client’s hardware to verify compatibility before mass production.
Résultats du projet
- Delivery: 1,200 units completed and delivered 7 days ahead of the 45-day schedule, with a 100% pass rate in all tests.
- Performance: Enclosures operate stably in both mobile and stationary applications, with no overheating, dust accumulation, or structural issues reported. The lightweight aluminum design has contributed to a 12% improvement in energy efficiency for the client’s battery systems.
- Partnership: The client signed a 3-year strategic cooperation agreement, appointing Sanjun Hardware as the exclusive sheet metal enclosure supplier for its full line of battery pack products.
