| Design condition |
Usually favors PSA-backed |
Usually favors non-adhesive / captured |
| Cells stacked vertically or pad can fall before clamping |
Yes |
Only with a fixture or strong mechanical capture |
| Automated pick-and-place onto cell face |
Often |
Possible with vacuum-friendly encapsulation / carrier |
| Very tight stack-up tolerance |
Patterned / very thin PSA |
Often |
| Frequent service or cell replacement expected |
Low-tack or selective zones |
Often |
| High concern about adhesive aging or chemistry |
Needs extensive validation |
Often |
| Strong, stable module preload available immediately |
Optional assembly aid |
Often sufficient |
| Pad must be positively located through abuse conditions |
Use with geometry |
Use mechanical capture + preload |
What Should You Validate Before Freezing the Aerogel Retention Design?
A retention design is not validated because a prototype stayed in place during one bench assembly. The test plan should deliberately reproduce the forces and dimensional changes that can move the pad. For an automotive program, the following sequence is a practical starting point and should be aligned with the OEM or Tier-1 requirement set.
1. Dimensional and stack-up inspection
- Measure aerogel core thickness, total laminate thickness, adhesive thickness, die-cut outline, tab dimensions, and critical hole or notch location.
- Check edge seal width and any local thickness build-up caused by film overlap or adhesive transitions.
- Confirm the part remains flat enough for automated handling and does not curl excessively after liner removal.
2. Assembly-process retention
- Run the real cell insertion direction and speed, not only hand placement on a flat table.
- Measure pad displacement before and after the next cell or frame component is installed.
- Test worst-case surface cleanliness, liner peel angle, and adhesive application pressure.
- Verify operator and robot access to pull tabs without touching the aerogel or leaving liner fragments in the module.
3. Adhesive peel, shear, and creep testing
If PSA is used, test the bonded system—not only the adhesive supplier’s datasheet. Peel strength is useful for handling, but static shear and creep can be more relevant to a vertically oriented pad. Run samples at high and low temperatures, after humidity exposure, and after thermal aging on the actual substrate coating. Include dwell time because pressure-sensitive adhesives often develop bond strength after application rather than instantly.
4. Vibration and mechanical shock
After module-level vibration and shock testing, tear down the unit and measure actual pad displacement against the original datum. A pass/fail visual check can miss a few millimeters of migration that may be thermally important. Mark or photograph the starting location and define a quantitative displacement limit before the test.
5. Thermal cycling and humidity aging
Repeated cold-hot cycles can change cell dimensions, adhesive modulus, film stiffness, and stack pressure. Humidity can affect some adhesives and carrier constructions. The post-aging inspection should look for edge lift, liner-film delamination, wrinkling, core migration inside an envelope, adhesive ooze, and loss of positional accuracy.
6. Compression fatigue and end-of-life swelling simulation
Retention must survive the changing pressure state of the cell stack. Use the expected swelling envelope or a mechanical surrogate to reproduce beginning-of-life and end-of-life dimensions. Check both the barrier’s compressed thickness and its lateral stability. If a compression pad is combined with aerogel, test the composite stack as a system because the softer layer can redistribute pressure and change friction.
7. Thermal propagation or abuse validation on the final geometry
The final qualification needs to use the production-representative pad, adhesive pattern, carrier film, edge seal, cell spacing, compression, and neighboring hardware. Small changes to cutouts or edge position can create bypass paths that a simple coupon test will not reveal. The retention system has succeeded only if it keeps the thermal barrier in the intended location and the complete module meets the thermal-event requirement.

Common Aerogel Retention Mistakes That Create Field or Production Risk
Mistake 1: Relying on friction before the module is clamped
Final stack compression may be excellent, but the pad can still move during the two or three assembly steps before that compression exists. Temporary retention needs to be designed into the workstation, part, or module geometry.
Mistake 2: Choosing the strongest PSA instead of the right PSA
More peel strength is not automatically more reliability. The adhesive must match substrate energy, thermal aging, chemical exposure, dielectric requirements, rework strategy, and the desired compliance of the stack. Excessively aggressive adhesive can also damage a fragile carrier or make prototype iteration unnecessarily difficult.
Mistake 3: Treating the release liner as packaging rather than a process component
Liner shape, split position, pull-tab length, and peel direction directly affect placement accuracy and cycle time. Many assembly problems can be solved by changing liner architecture without changing the aerogel core at all.
Mistake 4: Ignoring core migration inside an encapsulated pad
An outer film can stay in place while the aerogel core shifts within the envelope if the internal construction is not controlled. Define how the core is registered, bonded, sealed, or constrained inside the laminate and inspect core-to-envelope position after aging and vibration.
Mistake 5: Adding locating cutouts that reduce the thermal barrier
Large notches may make assembly easier but expose direct cell-to-cell pathways. Every cutout should have a functional reason and should be reviewed against the thermal model. Whenever possible, put locating features in carrier extensions outside the required thermal coverage.
Mistake 6: Validating room-temperature fit only
A pack is not a room-temperature fixture. Adhesives soften or stiffen, films shrink or expand, cells swell, and module preload evolves. Retention validation needs environmental and life-cycle conditions, not just a golden sample on the bench.
Industry Insight: Aerogel Retention Is Becoming a System-Level Requirement
The EV industry is moving from material selection toward integrated thermal-propagation architecture. Commercial barrier suppliers emphasize compression durability, vibration/shock resistance, and encapsulated constructions—not only thermal conductivity. Patent activity similarly shows adhesive layers, assembly-pressure retention, integrated holding portions, and mechanically captured barriers. The direction is clear: the market increasingly expects the insulation part to be designed for the mechanical life of the battery, not merely to survive a flame or hot-plate test.
This matters even more under tightening battery-safety expectations. China’s GB 38031-2025 traction-battery safety standard became effective on July 1, 2026 and strengthened thermal-propagation safety requirements compared with the 2020 edition. The standard does not prescribe ‘use PSA on aerogel,’ but the engineering implication is important: every passive barrier must perform as installed. A high-performance material that migrates away from its intended location cannot deliver the protection assumed by the module design.
For sourcing teams, this shifts the supplier question from ‘Can you cut aerogel?’ to ‘Can you deliver an automotive-ready converted part with controlled laminate thickness, adhesive location, edge construction, positioning features, clean handling, traceability, and repeatable validation data?’ That is a much higher-value capability—and it is where precision die-cutting and lamination become part of battery safety engineering.
What Should Be Included in an RFQ for Anti-Shifting Aerogel Pads?
A detailed RFQ shortens DFM time and prevents the supplier from optimizing the wrong parameter. Send the information below even if some values are preliminary.
- Cell type and module architecture: prismatic, pouch, cylindrical grouping, cell count, orientation, and stack direction.
- Aerogel function: cell-to-cell propagation barrier, module side barrier, end-plate insulation, pack-lid insulation, or multi-function spacer.
- Required nominal thickness and allowed compressed-thickness window.
- Required thermal coverage area and all keep-out zones for vents, terminals, busbars, sensors, cooling interfaces, and fasteners.
- Expected beginning-of-life and end-of-life stack pressure or cell-swelling envelope.
- Retention preference: no adhesive, one-side PSA, two-side PSA, patterned adhesive, carrier tabs, frame capture, or open to DFM recommendation.
- Substrate material and surface finish to be bonded: coated aluminum cell can, polymer film, PC frame, mica, foam, metal enclosure, etc.
- Environmental conditions: temperature range, humidity, thermal cycling, vibration/shock requirement, and chemical exposure concerns.
- Assembly sequence: manual placement, robot pick-and-place, cell stacking order, liner removal method, temporary fixtures, and takt time.
- Quality documents: PPAP level, control plan, material certificates, dimensional Cpk requirements, lot traceability, and change-control expectations.
- Drawing files: DXF/DWG/STEP/PDF plus critical-to-quality dimensions and tolerance notes.
- Prototype quantity, validation schedule, target SOP volume, and annual demand.

How Boost Insulation Can Support Production-Ready Aerogel Retention
Boost Insulation positions its aerogel business around more than raw material supply. The company states that its engineering team provides DFM review for aerogel insulation, including optimization of material selection, thickness, and structural layout. Its current manufacturing scope includes die-cutting, CNC processing, multi-layer lamination of aerogel with adhesive and protective films, controlled cleanroom production, adhesive peel-strength testing, high-temperature aging, and rapid prototyping.
That combination is useful for pad-retention projects because the retention mechanism often belongs in the converted part. Instead of asking an assembly plant to separately buy aerogel, adhesive tape, carrier film, release liner, and a locating frame, the part can be engineered as a ready-to-place subassembly. Depending on the design, Boost can support one-side or patterned adhesive constructions, protective film lamination, custom tabs and notches, kiss-cut liners, and precision geometry that matches the module datum strategy.
For EV battery module programs, Boost also states that it supports automotive-grade manufacturing workflows including IATF 16949, APQP/PPAP support, lot traceability, cleanroom die-cutting and assembly, in-house tooling, and 48-hour rapid prototyping for custom parts. These capabilities are particularly relevant when the engineering team needs to iterate liner geometry, adhesive coverage, corner radii, tabs, or multi-layer stack-up before locking production tooling.
Recommended next step for an RFQ: Send the cell/module drawing, target aerogel thickness, expected compression or swelling range, and your current assembly sequence. Ask for a DFM review focused specifically on pad retention, liner design, and thermal keep-out zones—not only an outer-shape quotation.
Conclusion: Keep the Barrier Where the Thermal Model Put It
Preventing aerogel pads from shifting in EV packs is a mechanical-design and manufacturing problem as much as a materials problem. PSA can make assembly much more reliable, but adhesive should not automatically be the only retention mechanism. Encapsulation improves handling and dimensional stability; tabs and frame features provide positive location; and controlled stack compression can provide durable retention after the module is clamped. The most robust automotive design often combines these methods so no single process variation can move the barrier into a dangerous position.
If your current aerogel pad slides during cell stacking, lifts at the corners, wrinkles under compression, sheds dust, or requires too much manual alignment, the fix may be a relatively small DFM change: a different carrier film, a patterned PSA, a split release liner, a locating tab, a revised edge seal, or a tolerance adjustment. Those changes are far easier to implement before tooling and validation are frozen.
Need a custom aerogel pad that stays positioned through assembly and vehicle life? Send your drawing and module requirements to Boost Insulation for a manufacturability review and prototype recommendation. Request a quote or upload your design file.
Frequently Asked Questions
Can you use double-sided adhesive on aerogel pads in an EV battery pack?
Yes, some barrier constructions can use adhesive on one or both sides, but double-sided bonding should be selected carefully. It can improve placement stability, yet it also couples the barrier mechanically to two moving cell surfaces. If the cells need to breathe or swell independently, a one-side adhesive plus stack compression may be easier to control. Validate the actual adhesive, substrate, compression, thermal cycling, and service strategy before choosing two-sided bonding.
Is stack compression alone enough to keep aerogel from moving?
It can be, especially after the cell stack is fully clamped. Published battery thermal-sheet designs note that assembly pressure can hold stacked components in place without exposed adhesive.[6] The risk is the assembly period before full preload exists and any life-cycle condition that reduces local pressure. If the part can move before clamping, use temporary adhesive, a fixture, or a mechanical locating feature.
Why are aerogel pads often encapsulated in film?
Encapsulation improves handling, contains dust, protects the edges, and creates a stable surface for adhesive, printing, and automated placement. It can also make the pad easier to integrate with compression foam or other layers. Commercial EV battery products are available as encapsulated aerogel pads for intercell use.
What is the best way to stop a pad from sliding during prismatic-cell stacking?
A practical solution is to attach the pad lightly to the first cell with a thin, validated PSA, add a tab or datum feature if space permits, and design the module so final stack compression holds the barrier after assembly. This gives the line a stable part during insertion without making the adhesive solely responsible for long-term retention.
How much pad movement is acceptable after vibration testing?
There is no universal displacement value because the acceptable shift depends on the thermal coverage margin, cell geometry, and OEM specification. Define the maximum allowable X-Y movement from the thermal model and keep-out zones, then measure the pad location before and after vibration, shock, and environmental aging. A visible ‘still there’ inspection is not precise enough for a critical barrier.
Can Boost Insulation make adhesive-backed or laminated aerogel parts?
Boost Insulation states that its aerogel manufacturing services include multi-layer lamination of aerogel, adhesive, and protective films, precision die-cutting, cleanroom production, adhesive peel-strength testing, and rapid prototyping. For a specific project, the final construction should be confirmed through drawing review, material validation, and DFM before production release.
Technical References and Editorial Verification
- Aspen Aerogels – Thermal Runaway Barriers — Notes compression performance, compression-fatigue resilience, vibration/shock durability, and EV thermal-runaway barrier use. Source
- Saint-Gobain Tape Solutions – EV Battery Cell / TRP Pads — Lists an encapsulated aerogel intercell pad and discusses cell breathing/swelling and mechanical behavior. Source
- Google Patents – US20230282905A1, Battery Cell Thermal Runaway Barrier — Describes optional hot-melt or pressure-sensitive adhesive on encapsulated thermal barriers with release liners. Source
- Google Patents – EP4113714A1, Intercell Spacer and Battery Module — Describes a holding portion that makes a heat-resistant barrier easier to fix in position during module assembly. Source
- Google Patents – US20250062444A1, Thermal Barrier Assembly for Traction Battery Pack — Illustrates mechanically integrated thermal-barrier fingers/slots around battery terminal features. Source
- Google Patents – WO2021183493A1, Thermal Management Multilayer Sheet for a Battery — States that sheets can be placed or adhered and that battery assembly pressure can hold stacked components in place. Source
- China National Standard Information Public Service Platform – GB 38031-2025 — Official record: published March 28, 2025; effective July 1, 2026; replaces GB 38031-2020. Source
- Boost Insulation – Aerogel Insulation — Current Boost page describing DFM, lamination, die-cutting, cleanroom production, adhesive peel testing, high-temperature aging, and rapid prototyping. Source
- Boost Insulation – EV Battery Module Insulation / Home — Current Boost page describing automotive-grade production, IATF 16949, cleanroom manufacturing, prototyping, and EV module support. Source