Glass fiber, as an outstanding inorganic non-metallic material, boasts excellent insulation, high heat resistance, superior corrosion resistance, and high mechanical strength. In recent years, in the field of battery casing manufacturing that pursues ultimate lightweight and strength, glass fiber composite materials have become key materials due to their outstanding performance. Battery casings need to have good mechanical and insulation properties to ensure the safe and stable operation of batteries, and glass fiber precisely meets these strict requirements. However, traditional processing methods often encounter problems such as burrs, delamination, taper deformation, and severe edge carbonization when cutting this "tough nut," which not only affects the product's airtightness and structural strength but also hinders overall production efficiency. GW Laser, with its decade-long dedication to laser technology, has introduced a revolutionary high-brightness fiber laser cutting solution, setting a new benchmark and industry standard for glass fiber cutting with no taper, neat edges, and almost no carbon black!

Pain Terminator: The Precise "Surgical Knife" of High-Brightness Laser 

The effect of traditional laser cutting on glass fiber: rough edges, severe carbon black. 

When traditional lasers cut glass fibers, energy diffusion often leads to a "taper" phenomenon where the cut is wider at the top and narrower at the bottom (taper value ΔT = |W_top - W_bottom| / 2, where W_top is the width of the upper cut seam and W_bottom is the width of the lower cut seam), as well as excessive heat-affected zones causing material scorching, carbonization delamination, and the formation of a distinct carbon black layer along the edge. The high-brightness fiber laser from GW Laser is like equipping the cutting process with a high-precision "scalpel", especially achieving the ultimate suppression of the carbonization layer. 

Highly concentrated energy and extremely small spot size: The core lies in its ultra-high beam quality (BPP). The laser energy is compressed into an extremely small focused spot, and the power density soars geometrically. When facing glass fibers, it can achieve instantaneous vaporization of the material rather than melting, compressing the heat-affected zone (HAZ) to the micrometer level. The material achieves optimal absorption of the laser, thereby eliminating the generation of carbon black from the source and presenting a clean original color at the edge. 

Zero taper, vertical as a wall: The extremely small light spot and precisely controlled beam directivity ensure that the energy acts perpendicularly and uniformly along the cutting path. Whether it is thin plates or multi-layer structures, the two sides of the cut are smooth and vertical, with consistent upper and lower widths (ΔT approaches 0), achieving true "zero taper" cutting. This nearly vertical cut wall means: 

Perfect dimensional accuracy and fit: laying a perfect foundation for subsequent high-precision assembly (such as the tight fit between the battery seal cover plate and the shell), avoiding assembly gaps or stress concentration caused by taper. 

Maximizing effective connection area: In processes requiring bonding or welding, vertical wall surfaces offer the largest effective contact area, significantly enhancing connection strength and sealing reliability. 

Uniform structural strength: The entire cross-section of the cut is uniform, with no weak areas, maintaining the original structural integrity of the material. 

The edge is presented neatly: The high-brightness laser processing feature effectively avoids the burrs, chipping, and carbonization discoloration (yellowing and blackening) of the material layer caused by traditional processing. The cutting edge is smooth and neat, with uniform color, and almost no carbonization marks can be observed. This greatly enhances the appearance quality and structural integrity of the battery casing and reduces the need for manual carbonization removal processes.

The effect of GW laser cutting glass fiber: vertical and smooth edges, no visible carbonization. 

The taper value ΔT = (8.969 - 8.908) / 2 = 0.0305 ≈ 0 

Empowering Battery Manufacturing: The Precise Foundation of Reliable Shells 

The battery casing has extremely strict requirements for sealing, insulation and dimensional accuracy. GW Laser's high-brightness fiber laser cutting technology brings disruptive advantages to the processing of glass fiber for battery casings: 

Perfect airtightness guarantee: "Zero taper" (ΔT ≈ 0) cut and smooth, non-carbonized edge ensure seamless assembly or encapsulation of the shell, eliminating the risk of electrolyte leakage and building the first line of defense for the safe operation of the battery. 

High-strength non-destructive connection: Avoid interface weakening caused by thermal damage, delamination and carbonization layer, maintain the original strength and clean surface of the glass fiber substrate, and ensure that the cut components retain optimal mechanical properties and long-term reliability in subsequent bonding or assembly. 

High efficiency and high yield: Laser cutting is non-contact, fast and highly accurate. Combined with automated equipment, it significantly boosts production efficiency while nearly eliminating scrap rates caused by cutting defects such as taper deviation and carbonization pollution. 

Easily handle complex designs: Precisely process the irregular holes, fine contours and slits required for battery casings, meeting the increasingly complex structural design requirements of batteries, while maintaining low taper and no carbonization on the edges of complex shapes. 

As a global leader in high-brightness fiber lasers, GW Laser has always been committed to technological innovation and breakthroughs. The successful application in the field of glass fiber cutting not only demonstrates its profound expertise in laser technology but also injects strong impetus into the development of related industries. Our high-brightness fiber laser cutting solution has core breakthroughs in two major industry challenges: "cone control" and "carbonization inhibition". 

* Taper (ΔT): A key indicator for quantifying the verticality of the cut (ΔT = |W_top - W_bottom| / 2). The GW solution achieves ΔT approaching zero, ensuring precise dimensions, tight assembly, and undiminished strength. 

Carbonization control: Through the cutting mechanism of ultra-high power density, the optimal absorption of laser by the material is achieved, resulting in almost no visible carbon black at the edge, ensuring the intrinsic properties and clean appearance of the material. 

Bid farewell to tapering and carbonization troubles, embrace perfect cutting, and choose GW Laser to infuse your battery shell manufacturing with surging innovative momentum and ultimate reliable precision quality!