Custom battery enclosure drawing requirements for an OEM should define the permitted envelope, mounting interfaces, connector access and the conditions under which fit will be accepted. Overall length, width and height are a useful start, but they leave assembly and servicing questions unanswered.
The drawing package should let the battery supplier and equipment designer discuss the same physical interface. It should also give the receiving team a clear way to identify the approved revision and inspect the sample.
Define the interface boundary first
State which party controls the battery enclosure, equipment tray, restraint, harness and mating connector. If a component sits outside the battery supplier’s scope, include its interface drawing rather than relying on a verbal description.
NASA’s interface requirements outline identifies coordinate systems, units, tolerances and responsibilities as interface-document content. Those are useful general engineering practices for an OEM brief; they do not make the battery subject to a NASA specification.
Use Customization to discuss the enclosure and equipment interfaces before treating an early sketch as a manufacturing release.
Separate the installed envelope from access space
Show the maximum permitted installed envelope, including protrusions. Identify handles, connectors, cable exits, brackets and anything that moves during insertion or removal. Distinguish these from space needed to reach a latch, operate a tool or remove a cover.
For a removable pack, show the insertion path and the surrounding equipment throughout that movement. For a fixed pack, show how it is placed and secured during assembly. A pack can fit in its final position while remaining impossible to install through the available opening.
Make critical interfaces measurable
| Drawing item | What to show | Question for approval |
|---|---|---|
| Envelope | Maximum dimensions and protrusions | What space is guaranteed available? |
| Reference system | Origin, axes and functional reference surfaces | Are both drawings using the same references? |
| Mounting | Hole pattern, bracket locations and restraint boundary | Which features must align with the equipment? |
| Connector | Position, orientation and mating access | Can it connect without interference? |
| Harness | Exit direction, routing and supplier bend limits | Is the routed assembly represented? |
| Service access | Removal path, tools and accessible features | Can the agreed service task be completed? |
| Revision | Drawing number, revision and approval status | Which file controls the build? |
Identify the features that govern fit and give them tolerances agreed by the responsible engineers. Avoid assigning unusually tight tolerances everywhere: ask which features require close control and how they will be measured. A supplier’s general tolerance note may need additional agreement for a critical mating interface.
Add loads and exposure without inventing specifications
Provide the installed orientation, expected mass constraints and relevant handling or operating loads. Describe vibration, moisture, dust, nearby heat sources and cleaning exposure. These inputs help the parties define evaluation needs; they do not establish a tested protection rating.
If a sealed interface is required, identify the sealing boundary and the installed condition to be evaluated. Do not write “waterproof” on a drawing as a substitute for an agreed requirement and evidence. Likewise, an enclosure dimension does not establish electrical clearances, thermal performance or structural suitability.
Keep unresolved items visible in an issue list, with an owner and the evidence required for closure. An unknown connector model should remain an open interface item rather than becoming a guessed cutout.
Reconcile the digital files and the physical sample
Agree which document controls if a 3D model and dimensioned drawing conflict. Request that sample measurement records cite the drawing revision and show results for the critical features. Check the sample with the intended mating equipment or a justified representative fixture.
NASA’s interface management guidance links controlled interface documentation to integration and verification. For an OEM project, apply that principle by reviewing a moved connector or revised mounting bracket before accepting the change. Do not let an emailed replacement model silently become the production definition.
The Process page provides context on battery pack assembly. To begin a project discussion, share the available-space model, mating interfaces and unresolved dimensions when you discuss your requirements via B2B enquiry. Manufacturing capability, evaluation scope and final tolerances should be confirmed for the proposed design.