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New Energy & Battery Assembly Automation Solutions

How Morewell automatic dispensing, potting, screw fastening, and soldering machines help battery pack, BMS, and energy storage manufacturers achieve consistent quality, meet safety standards, and scale production reliably.

01The New Energy Battery Assembly Challenge

Battery cells, modules, and packs for electric vehicles, e-bikes, power tools, and stationary energy storage are among the most demanding assembly environments in manufacturing. Every process step — bonding cells together, applying thermal interface material, sealing the pack enclosure, fastening modules to the tray — directly affects safety, performance, and product lifespan. A void in the potting compound, an inconsistent sealant bead, a missed screw, or a cold solder joint on the BMS board can lead to moisture ingress, thermal runaway, or field failure under vibration — all of which carry serious consequences.

At Morewell, we supply automatic glue dispensing, glue potting, screw fastening, and soldering machines to manufacturers working across the new energy battery supply chain — from cell assemblers and module builders to pack integrators and BMS PCB producers. This page describes the specific assembly processes at each level, the common failure modes, and how our machines address them in real production environments.

Battery assembly is organized around three levels, each with distinct process requirements:

1

Cell Level

Prismatic, cylindrical (18650 / 21700 / 4680), or pouch cells — individual units before grouping

2

Module Level

Cells bonded, stacked, and electrically connected into a module with BMS integration

3

Pack Level

Modules mounted in a tray or housing, thermally managed, sealed, fastened, and tested

Morewell machines are deployed at all three levels. The right machine type depends on which level you are at and what material or process you are working with. This page walks through the most common applications at each level with the real process details that matter.

02Key Assembly Processes and Where Things Go Wrong

Below are the six most common process steps where battery manufacturers run into quality problems with manual assembly — and where Morewell automation delivers consistent, measurable improvement.

Module Level

Cell-to-Cell Adhesive Bonding

✗Manual adhesive application between prismatic or pouch cells creates inconsistent bond lines — too much causes cell deformation under compression; too little means poor structural integrity and vibration sensitivity in the field
✓Automatic glue dispensing applies a precise, continuous adhesive bead across each cell face — volume and position controlled to ±0.1 mm, every cell, every stack, regardless of operator or shift
Module / Pack

Thermal Interface Material (TIM)

✗TIM is a thick, abrasive paste (50,000–300,000 cps) applied between cells/modules and the cooling plate. Manual application leaves air pockets and uneven thickness — both reduce thermal conductivity and can cause localized overheating during operation
✓High-pressure piston dispensing with wear-resistant wetted parts handles abrasive TIM without drift. Serpentine or dot-matrix fill patterns ensure full coverage and controlled layer thickness — confirmed by downstream height measurement
Pack Level

Pack Enclosure FIPG Sealing

✗The pack lid must be sealed with a continuous, void-free bead of silicone FIPG sealant — sometimes over a perimeter of 1.5–2 meters. A single gap or thin spot in the bead allows moisture ingress: the primary cause of corrosion-related pack failures in the field
✓Automatic dispensing traces the full housing perimeter in a single uninterrupted path at constant speed, including corners. The start/stop overlap zone is programmed to prevent any bead gap — eliminating the most common manual sealing failure mode
Pack Level

Module-to-Tray Screw Fastening

✗Battery modules must be secured to the pack tray with specific torque values — too loose causes vibration loosening under operating conditions; over-torque cracks module housings. Torque inconsistency and missed screws are common in high-volume manual assembly, especially across long shifts
✓Automatic screw fastening with closed-loop torque and angle monitoring records every fastener per module per serial number. NG events (wrong torque, stripped thread, missed position) immediately alarm and prevent the unit from advancing to the next station
BMS / PCB Level

BMS PCB Conformal Coating

✗The Battery Management System PCB monitors cell voltage, current, and temperature in real time — it is exposed to humidity, condensation, and electrolyte vapor. Without adequate conformal coating, traces corrode and the BMS can fail, leading to undetected overcharge or cell imbalance
✓Programmable selective conformal coating covers all exposed circuitry with a uniform film while precisely skipping connectors, test points, and heat sink contact areas — repeatable to ±0.5 mm on every board, with no masking tape required
BMS / PCB Level

BMS THT Connector Soldering

✗BMS boards carry both SMD components and through-hole connectors for cell sense wiring, current shunts, and power MOSFETs. Hand-soldering at volume produces cold joints and solder bridges — faults that often pass visual inspection but fail under current load or vibration in the field
✓Selective automatic soldering targets only THT pad locations without thermally stressing adjacent fine-pitch SMD components. Temperature, dwell time, and solder feed are stored per product recipe — consistent joint quality on every board and every shift
⚠️ Safety note: Battery assembly failures — voids in insulation, missing fasteners, degraded BMS protection — can contribute to thermal runaway events. This makes process repeatability and 100% data traceability not just quality targets, but safety requirements. Morewell machines log every process parameter per unit as a standard feature, not an add-on.

03Battery Assembly Stage → Challenge → Morewell Machine

The table below maps common new energy battery assembly stages to the process challenge and the Morewell machine that addresses it:

Assembly Level & Stage Core Process Challenge Morewell Machine
Cell-to-cell adhesive bonding
Module level 		Consistent bead volume & position on every cell face; no overflow into cell terminals Dispensing Automatic Glue Dispensing Machine
TIM application on cooling plate
Module / Pack level 		Full surface coverage; controlled thickness; no air pockets; must handle abrasive TIM paste without valve wear Dispensing High-pressure piston / gear-pump dispenser
Pack enclosure FIPG sealing
Pack level 		Continuous bead over 1–2 m perimeter; uniform cross-section; no gap at start/stop overlap Dispensing Automatic Glue Dispensing Machine
Connector & vent sealing
Pack level 		Micro-bead application in tight geometries; silicone or PU sealant Dispensing Needle valve or micro-jet dispensing
Module-to-tray fastening
Pack level 		Defined torque per fastener; 100% traceability; alarm on missed or stripped screws Screwdriving Automatic Screw Fastening Machine
Pack cover fastening
Pack level 		Multi-fastener sequence (20–60 screws per pack); torque + angle every fastener Screwdriving Multi-spindle Screw Fastening Machine
BMS PCB conformal coating
BMS / PCB level 		Selective coverage of live areas; precise skip over connectors and test points Dispensing Selective conformal coating program
BMS THT connector soldering
BMS / PCB level 		Selective soldering of THT joints without thermal damage to adjacent SMD components Soldering Automatic Soldering Machine
BMS / power module potting
BMS enclosure 		Void-free 2K fill for electrical insulation and vibration protection in stationary or mobile ESS Potting Automatic Glue Potting Machine (2K)
? All Morewell machines are available as standalone desktop cells for R&D and pilot production, or as in-line conveyor systems for mass production. The software interface and valve technology are shared across both formats — so process parameters qualified on a desktop unit transfer directly to the production line without re-qualification from scratch.

04Technical Considerations for Battery Assembly

Adhesive, Sealant, and Compound Materials in Battery Manufacturing

New energy battery assembly uses a wider range of fluid materials than most other industries — and many of them are difficult to dispense. Here are the main material categories Morewell systems are qualified to handle in battery applications, with the key dispensing challenges for each:

Thermal Interface Material (TIM)

50,000–300,000 cps  ·  Highly abrasive

Applied between cells/modules and cooling plates. Requires high-pressure dispensing with wear-resistant stainless-steel or ceramic wetted parts. Serpentine or dot-matrix fill patterns ensure complete coverage without air pockets.

FIPG Sealant (Silicone / PU)

50,000–500,000 cps  ·  1K or 2K

Applied as a continuous bead to seal pack housing lids. Critical parameter: consistent bead cross-section — a flat or undersized bead will not compress to form a seal under clamping force. Start/stop overlap programming is essential.

Structural Adhesive (Epoxy / Acrylic)

5,000–100,000 cps  ·  1K or 2K

Used for cell-to-cell bonding and cell-to-carrier bonding. For 2K formulations, pot life can be as short as 5–15 minutes after mixing — requiring a dispense-and-assemble sequence within that window.

Conformal Coating (Acrylic / Silicone)

100–2,000 cps  ·  Low viscosity

Applied selectively over BMS PCBs for moisture and contamination protection. Requires low-pressure needle or flat-jet dispensing. The dispense program must precisely skip connector bodies, test pads, and heat sink contact areas.

Potting Compound (Epoxy / PU)

1,000–30,000 cps  ·  2K  ·  Void-sensitive

Used to encapsulate BMS enclosures and power electronics for vibration protection and electrical insulation. Void-free fill is critical — air pockets reduce dielectric performance and create paths for moisture ingress.

Thread-Locker (Anaerobic)

50–500 cps  ·  Micro-volume

Applied as a micro-dot on fastener threads before driving to prevent vibration loosening on module-to-tray and high-voltage connector fasteners. Volume must be tightly controlled — excess material affects the torque specification.

Why TIM Dispensing Requires Special Attention

TIM is one of the most difficult materials to dispense reliably in battery assembly. Its high viscosity and abrasive filler particles — typically alumina, boron nitride, or graphite — cause rapid wear on standard dispensing valves. Using an unsuitable dispenser leads to deposit volume drift over time: the first modules off the line may have adequate thermal contact, while units assembled later in the shift do not. This type of drift is hard to detect without sampling because the deposited material looks visually similar whether the volume is within spec or 20% low. Morewell's TIM dispensing configurations use high-pressure piston technology with stainless-steel or ceramic-lined wetted components selected specifically for this class of material.

Screw Fastening Requirements in Battery Pack Assembly

Battery pack assembly involves multiple fastening operations, each with different screw types and torque specifications:

Standards and Certifications Supported

✓ UN 38.3 Transport Safety ✓ IEC 62619 (Stationary Storage) ✓ ISO 26262 (Automotive Functional Safety) ✓ IATF 16949 Process Traceability ✓ IPC-A-610 Solder Quality Standard ✓ UL 1973 (Energy Storage Systems)

Note: Meeting these standards is the manufacturer's responsibility. Morewell machines support the process quality and per-unit data traceability that these certification audits require.

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TIM Flow: 0.5–500 ml/min

High-pressure piston dispensing range — covers micro-application to large-area cooling plate fill in a single platform

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Bead Position: ±0.1 mm

Gantry repeat positioning — sufficient for cell bonding bead accuracy and FIPG sealing bead consistency

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2K Mix Ratio: ±1%

A:B ratio accuracy for structural epoxy and PU potting — critical for achieving rated cure properties

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Torque Accuracy: ±3%

Closed-loop servo control on every fastener; records torque, angle, and result per serial number

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Solder Temp: ±2°C

Selective soldering for BMS THT joints; SAC305 lead-free or Sn63Pb37; parameters per recipe

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100% Per-Unit Logged

Every dispense volume, torque, solder parameter, and timestamp linked to unit serial number — standard, not optional

05Real-World Application Results

The following four examples are drawn from actual Morewell customer deployments in the new energy and battery industry. All company names are withheld under confidentiality agreements; all figures reflect verified production data.

01
LFP Prismatic Cell Module Manufacturer · Jiangsu

Cell-to-Cell Bonding — Automatic Glue Dispensing of Structural Epoxy

Challenge

A lithium iron phosphate (LFP) prismatic cell module manufacturer was bonding 16-cell modules using a two-component structural epoxy applied manually by squeeze-bottle. The target bond line was 0.5 mm ±0.15 mm in width. Actual production measurements showed a range from 0.2 mm to 1.1 mm — causing variable compression behavior during module clamping. Under-bonded modules were generating field returns related to cell shifting after 8–12 months of use in delivery vehicle battery packs.

Morewell Solution

A single-axis automatic glue dispensing machine with a screw-valve dispenser was deployed. The system applies the structural adhesive in a programmed straight bead along each cell face in 1.8 seconds per cell, with bead width held to 0.5 mm ±0.08 mm. The 2K static mixer is replaced on a timed cycle to prevent pot-life-related quality drift. Mix ratio is metered at ±1% by volume using dual gear pumps.

0.2–1.1 mm
→ 0.42–0.58 mmBond line width (actual production range)
−82%Cell-shifting field returns
1.8 sec/cellDispensing cycle per cell face
02
EV Battery Pack Integrator · Guangdong

Pack Enclosure Lid Sealing — Continuous FIPG Silicone Bead Dispensing

Challenge

An EV battery pack assembler needed to apply a continuous RTV silicone FIPG bead around the full perimeter of an aluminum pack housing — approximately 1.8 meters of bead per pack. Manual application produced bead cross-sections varying from 2 mm to 6 mm width, with occasional gaps at corners where operators repositioned their hand. The IP67 first-pass rate was 84% — meaning 16% of completed packs required rework before the waterproof test could be passed.

Morewell Solution

A three-axis automatic dispensing gantry with a servo-controlled sealant valve was programmed to trace the housing perimeter at 80 mm/sec, applying a 4.0 mm ±0.3 mm bead in a single uninterrupted path including all four corners. The start/stop overlap zone is programmed at 15 mm with a taper-down ramp to prevent bead buildup at the joint point. Total dispense time per pack: 23 seconds.

84% → 99.6%IP67 first-pass rate
−91%Rework incidents per week
23 secFull-perimeter dispense cycle
03
Energy Storage System Manufacturer · Zhejiang

BMS Enclosure Potting — 2K Polyurethane for Vibration & Moisture Protection

Challenge

A manufacturer of industrial energy storage systems (IEC 62619 application) was encapsulating BMS main control boards inside a plastic housing using a two-component polyurethane potting compound. The potted modules must survive temperature cycling from -20°C to 60°C without cracking or delamination. Manual potting was producing an 11% void rate detected by post-cure CT scan sampling, caused by inadequate fill speed and variable A:B mixing during the manual mix stage.

Morewell Solution

A 2K automatic glue potting machine with a dynamic mixing head was deployed, dispensing the polyurethane compound at a controlled fill rate from the cavity bottom upward to push air out ahead of the rising material. A:B ratio is metered at ±0.8% by volume. A post-fill weight check gate confirms every unit is within ±2% of the target fill weight before advancing to cure. Fill time per housing: 35 seconds.

11% → 0.4%Void rate (CT scan sampling)
100%Temperature cycling test pass rate
±0.8%A:B mix ratio in production
04
BMS PCB Assembler · Shenzhen

BMS Main Board — Selective Soldering of THT Power Connectors

Challenge

A BMS PCB assembler producing boards for lithium battery packs had six through-hole power connectors on each board alongside a dense SMD layout including fine-pitch AFE (Analog Front-End) ICs and SMD current shunts. Wave soldering was ruled out due to thermal risk to the SMD components. Hand soldering was producing a 2.1% defect rate (cold joints and solder bridges) and required an average of 52 seconds per board — the bottleneck on the entire PCB assembly line.

Morewell Solution

A selective automatic soldering machine with a nitrogen-protected mini-wave nozzle was programmed to solder all six THT connector positions in a single automated cycle. Solder temperature at the nozzle tip is controlled to ±2°C; dwell time is 2.8 seconds per connector. Lead-free SAC305 solder is used. Total cycle time per board including handling: 18 seconds. All solder parameters are logged per board serial number.

2.1% → 0.08%Solder defect rate
52 → 18 secCycle time per board
SAC305Lead-free, RoHS compliant

06Production Line Integration & Traceability

Battery manufacturers supplying automotive OEMs or regulated energy storage markets face some of the strictest process traceability requirements in manufacturing. Morewell machines meet these requirements as standard:

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Modbus, PROFINET, EtherNet/IP

Compatible with Siemens, Mitsubishi, Omron, and Beckhoff PLC platforms — integrates into existing line control without custom middleware

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Per-Unit Process Records

Every dispensing volume, torque value, solder parameter, and cycle timestamp logged per unit serial number — exported as CSV, XML, or via database API

?️

Barcode / QR / RFID Traceability

Integrated scanners link all process data to the battery module or pack serial number — supports 15-year retention requirements for automotive battery traceability

?

Real-Time NG Interlock

Any out-of-tolerance event triggers conveyor stop and alarm — no defective unit can advance to the next station without operator intervention and re-verification

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SPC Data Output

Process data streams feed directly into SPC software for Cpk monitoring — supports IATF 16949 and AIAG process capability submission requirements

07Frequently Asked Questions

This is the most common question we receive from battery manufacturers, and it is a legitimate concern. Standard needle valves and rotary valves are not designed for abrasive TIM pastes and will show measurable wear within weeks of production use — leading to deposit volume drift that is hard to detect without regular sampling. For TIM dispensing, Morewell uses high-pressure piston-type dispensers with stainless-steel or ceramic-lined fluid paths and hardened wetted components selected specifically for this application. Before we quote any TIM dispensing project, we ask for a sample of your specific material — viscosity, filler type, filler particle size, and operating temperature all affect the right selection. We do not apply a one-size-fits-all recommendation because the differences between TIM formulations are significant enough to matter.
Yes. Short pot-life 2K materials are handled with a static or dynamic inline mixer that combines Components A and B only at the point of dispensing — not in a pre-mixed reservoir. Components A and B are stored separately in the machine and only meet at the mixing element immediately before the material exits the nozzle. At the end of a run or during planned downtime, the short mixing element is purged or replaced in under two minutes. The A and B reservoirs contain unmixed material that will not cure — so there is no risk of material hardening inside the pump or hoses even during extended downtime. For pot lives under 5 minutes, we recommend a dynamic mixer configuration for more precise control over when mixing begins.
Morewell screw fastening systems store multi-step product recipes where each fastener position in the sequence can have its own torque target, upper and lower limits, angle monitoring window, and drive approach speed. A 48-fastener program runs as a single sequence — the operator scans the pack serial number, the correct recipe loads automatically, and the system drives all 48 fasteners in order with torque and angle data recorded for each one. If any fastener is outside its individual spec window, the system stops immediately, logs the failure including the specific fastener position and the actual value measured, and does not release the pack for downstream processing. At end-of-shift, complete per-pack fastening records are available for quality reporting and traceability documentation.
Yes, and selective dispensing is one of the most consistent approaches for this application. In a dispensing program, the coating path is defined in software — the dispensing head follows the areas to be coated and lifts or stops when passing over defined exclusion zones (connector bodies, test pads, heat sink contact surfaces). The repeat positioning accuracy of Morewell's motion platform (±0.1 mm) means exclusion zones are respected to within approximately 0.3–0.5 mm of the connector body edge on every board. This eliminates the labor and material cost of applying and removing masking tape and plugs, and produces a fully repeatable result that is independent of operator skill. For BMS boards where coating coverage is safety-critical, we also recommend a downstream camera verification pass to confirm the coating boundary on the first board of each batch.
Yes. Morewell machines export per-unit process records that include timestamp, operator ID, machine ID, recipe version number, and all measured parameters — dispense volume, torque values, solder temperatures, pass/fail result — linked to the unit serial number. These records can be stored in your MES or quality database for the full 15-year automotive traceability window required by major OEMs. The machine software also supports process capability reporting (Cp, Cpk) for critical parameters such as dispense volume and fastener torque, which is required under IATF 16949 process capability submissions. We have supported customers through IATF audits and can provide documentation of our machine's measurement system and logging capabilities to support your quality documentation package.
Yes. Morewell machines store an unlimited number of product recipes identified by name or recipe number. When the operator scans the work order barcode or selects the product on the touchscreen, all parameters for that product — dispense path, speed, volume, torque targets, or solder dwell time — load immediately. Changeover between two completely different product configurations takes under 30 seconds. This is particularly practical for battery manufacturers running EV pack and stationary ESS products on the same assembly infrastructure, since the two product types often differ significantly in geometry, material volume, and fastener specification — but can share the same machine with no hardware changes between runs.

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