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CN215429971U - Laboratory-Scale Battery Coating Machine

Sep 09,2026
GRANTED UTILITY MODEL · CN215429971U · ACTIVE
Laboratory-Scale Battery Electrode Coating Machine

A complete coating line - unwinder, coating station, dryer, rewinder and an inline slurry mixer - integrated in one compact, portable housing for laboratory battery work.

Full specification and drawings: CN215429971U on Google Patents

Electrode coating sets the capacity, consistency and safety of a lithium cell: slurry must be spread evenly over the current collector and its solvent dried out, and coating quality flows directly into capacity, internal resistance, cycle life and safety. Production coaters do this well at scale - but they are large, built for batch production, and poorly suited to the coating work a laboratory actually needs.

CN215429971U, filed on 9 September 2021, answers that gap with a different geometry: instead of shrinking a production line, it packs the whole coating function - unwinder, coating station, dryer, rewinder and slurry mixer - into a single small housing that sits on a bench and can be carried.

Patent Information

Publication number CN215429971U
Title (original) 一种基于实验室的小型电池涂布机 (Laboratory-Scale Battery Electrode Coating Machine)
Inventors Huang Zhengyao (Dany Huang); Tobey Chen
Current assignee XIAMEN TOB NEW ENERGY TECHNOLOGY Co., Ltd. - the registered entity of TOB NEW ENERGY
Filing date 9 September 2021
Document type Utility model (kind code U)
Legal status Active
Anticipated expiration 9 September 2031
Drawings 6 figures
About titles and terminology on this page. The English title above is a human-reviewed translation by TOB NEW ENERGY's engineering team, standardised to the terminology used across our equipment line; it is not a machine rendering. The original Chinese title and claims are the authoritative text - a reader comparing this page with Google Patents may notice wording differences precisely because the public record there is machine-translated. Figures and mechanism descriptions on this page are drawn from the Chinese specification and claims, not from any translation of them.
A note on patent type. This is a Chinese utility model patent, which protects the mechanical structure of a device rather than a chemical formulation or process. Utility models carry a ten-year term and are examined for novelty and practical applicability. What follows is therefore a structural description - the claims define an apparatus, and the specification does not publish measured performance figures. Any throughput or coating-speed numbers for TOB's production machines come from our equipment datasheets, not from this patent document.

The Production Problem This Patent Solves

The specification identifies the mismatch plainly: battery coating machines on the market are mostly used for batch production. They are large machines, and they are not suited to the coating work of a laboratory cell.

A lab researcher who needs coated electrode rolls faces an awkward choice - commit small development batches to a full-size production coater, or fall back to manual methods with poor uniformity. Neither serves the actual need: a complete, repeatable coating process on a bench-scale footprint.

The Core Approach: A Complete Coating Line in One Small Housing

Rather than scaling a production coater down, CN215429971U re-integrates the coating process around a coating processing table inside a box housing. The web path runs: unwinder → coating station → dryer → rewinder, all inside the enclosure, with an inline slurry mixer between the unwinder and the coating station.

The mixer's delivery pipe discharges slurry exactly between the unwinder and the coating station - the shortest possible path from freshly mixed slurry to the web, so the coated material is always fed from a consistent slurry condition.

Structural Specification

Web path inside the housing

The unwinding device sits at the front end of the coating table: a motor case drives a drum via a rotating shaft to pay out the film roll. The coating device follows - a leveling roller presses slurry onto the web, and a coating brush behind it sweeps away surplus slurry that was not pressed in. The rewinder collects the coated web, and a dryer sits between the coater and the rewinder so the wet layer is cured before winding.

Inline slurry mixing with the shortest delivery path

The slurry mixer is placed between the unwinding device and the coating device, seated in a recess in the housing so it cannot drift during stirring. Inside it, a stirring rod driven by a motor case through a stirring shaft mixes the coating slurry, and an inlet pipe admits raw materials. A delivery pipe carries the stirred slurry to the web - its outlet extends to the midpoint between the unwinding device and the coating device.

Compact, portable housing

A controller on the front face governs unwinding, stirring and coating. The housing is closed by a cover with a switch handle, fitted with carrying handles on both sides for transport, and stands on support plates via connecting columns. The control panel carries an operating key, a display lamp panel and a peripheral interface.

Claimed Benefits

Benefit Mechanism responsible
Complete coating work in a small footprint Unwinder, coater, dryer, rewinder and mixer integrated inside the housing
Consistent slurry at the point of coating Mixer placed between unwinder and coater, delivery pipe outlet at the midpoint
Controlled wet layer thickness Leveling roller pressing slurry, coating brush removing surplus
Cured web before rewinding Dryer between the coating device and the rewinder
Portable for laboratory use Carrying handles and compact enclosure

How It Compares with a Conventional Coating Setup

Production coaters coat well at scale, but they are large machines built for batch output and poorly suited to laboratory battery work; the common alternative, manual coating, gives poor uniformity. This patent instead packs the complete coating path - unwinder, coating station, dryer, rewinder and an inline slurry mixer - into one compact housing that sits on a bench and can be carried.

Dimension Conventional approach This patent design
Footprint Full-size production coater sized for batch runs Complete coating path inside one compact, portable housing
Slurry supply Mixed remotely and transported to the coater Inline mixer whose delivery pipe discharges at the midpoint between unwinder and coater
Laboratory use Poor fit for small development batches; manual methods lack uniformity Repeatable coating process on a bench-scale footprint

Where This Technology Is Used Today

This patent covers the mechanical architecture of TOB's laboratory-scale electrode coating machines. The integrated design it protects - complete coating path with inline slurry mixing inside a compact housing - is how our lab coaters bring production-style coating quality to research quantities.

Related equipment enquiries: request a quote

Patent Drawings

CN215429971U Figure 1 - front view with the cover closed
Figure 1 - Front view with the cover closed
CN215429971U Figure 2 - external perspective view of the compact laboratory coater
Figure 2 - External perspective view of the compact coater
CN215429971U Figure 3 - internal structure, cover removed, first perspective view
Figure 3 - Internal perspective view 1 with the cover removed
CN215429971U Figure 4 - internal structure, cover removed, second perspective view
Figure 4 - Internal perspective view 2 with the cover removed
CN215429971U Figure 5 - internal structure, cover removed, third perspective view
Figure 5 - Internal perspective view 3 with the cover removed
CN215429971U Figure 6 - top view of the internal layout with the cover removed
Figure 6 - Top view with the cover removed

Frequently Asked Questions

What does patent CN215429971U cover?

A laboratory-scale battery electrode coating machine that integrates an unwinder, a coating station with a leveling roller and a coating brush, a dryer, a rewinder and an inline slurry mixer inside a single compact housing, with the slurry delivery pipe outlet opening between the unwinder and the coating station.

Why deliver the slurry between the unwinder and the coating station?

The slurry mixer sits between the unwinder and the coating station, and its delivery pipe discharges exactly between the two. Freshly mixed slurry reaches the web over the shortest possible path, which avoids the settling and consistency drift that can occur when slurry is transported over a long distance from a remote mixer.

How does the machine control wet coating thickness?

A leveling roller presses the slurry onto the moving web, and a coating brush behind it sweeps away the surplus slurry that was not pressed in. Together they set a uniform wet layer before the web enters the dryer.

Why integrate a complete coating line in a small housing?

Conventional coating machines are built for batch production - they are large and poorly suited to laboratory battery work. Housing the unwinder, coater, dryer, rewinder and mixer in one portable enclosure lets a lab produce coated electrode rolls with a small footprint that can be carried.

Is patent CN215429971U still in force?

Yes. It is Active, filed on 9 September 2021 with anticipated expiration on 9 September 2031.

Full specification and drawings: CN215429971U on Google Patents