项目背景
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.
关键要求包括：
- IP54防尘防水
- 尺寸公差≤±0.03mm
- 高效散热，实现连续运行
- Lightweight design for enhanced energy efficiency
- Compatibility with standard battery modules and mounting hardware
- 稳定的批量生产质量
- 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.
核心部件制造工艺
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.材料选择和；预处理
- 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.核心制造工艺
- 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.质量控制和；测试
- Dimensional inspection: CMM measurement to confirm tolerance ≤±0.03mm and compatibility with standard battery modules.
- IP54防护测试：根据IEC 60529标准进行防尘防水测试。
- 散热测试：热成像，以验证满载下的有效气流和温度控制。
- Connector fit test: Assembly testing with the client’s battery connectors to ensure seamless fit and electrical integrity.
- 全功能检查：交付前100%检查，无缺陷。
项目挑战与；解决方案
1.挑战：平衡散热和防尘
The battery pack requires efficient airflow to prevent overheating, while also needing to protect internal components from dust and debris common in industrial environments.
解决方案: 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.
解决方案: 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.挑战：批量定制的高一致性
The customer required 1,200 units with uniform appearance, size, and performance across all units.
解决方案自动化生产线和统计过程控制（SPC）用于实时监控加工参数。每50个单元进行一次抽样检查，以确保尺寸、表面光洁度和功能性能的稳定性。
4. Challenge: Compatibility with Standard Battery Modules
The enclosure must seamlessly accommodate standard battery modules and BMS components.
解决方案: 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.
项目成果
- 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.
