battery machine and materials solution

Pinery Gong

Pinery Gong, Principal Engineer at TOB NEW ENERGY
Pinery Gong
Principal Engineer
XIAMEN TOB NEW ENERGY TECHNOLOGY Co., Ltd.
Pinery Gong is a battery assembly process and yield engineer. Across pouch, steel-can, prismatic aluminium-shell and energy storage cells, his work has consistently taken defect rates from percentage points down to parts per million — leakage from 6% to 60 ppm, electrode fracture from 10% to 80 ppm, tab defects from 20% to 500 ppm. He has raised PACK yield from 85% to 99%, lifted PACK output from 500 to 15,000 units per shift, and delivered annual cost savings above 5 million CNY. He has built and led process teams of up to 40 engineers.

At a Glance

60 ppmLeakage defect rate, down from 6%
99%PACK yield, up from 85%
30×PACK output increase per shift
5M+ CNYAnnual cost saving delivered
40Largest process team built and led

Yield and Defect Reduction Record

Every figure below is tied to a named employer and period. Defect rates are expressed as originally measured — percentages where the starting point was percentage-level, ppm where the result reached parts-per-million.

Consumer and steel-can cells Wanxiang Technology (Microvast Electronics) · 2020.07 – 2022.11 · 15-person process team

Metric Before After Note
Electrolyte leakage defect 6% 60 ppm Dedicated improvement programme on a core failure mode
Electrode fracture defect 10% 80 ppm Root-cause work on electrode handling and winding
Overall cell pass rate 75% 90% Composite yield across the cell process
PACK pass rate 85% 99% Pack assembly line
PACK output per shift 500 units 15,000 units Full automation rollout and process iteration
Total labour cost Baseline −20% Operation merging, process optimisation, headcount rationalisation

Prismatic aluminium-shell power and storage cells Geely Technology Lixin Energy · 2022.11 – 2024.04 · Process Department Head, 40-person team

Metric Before After Note
NCM-manganese cell short-circuit rate 10% 0.5% Workshop humidity control, bend structure redesign, equipment upgrade
Separator misalignment defect 6% 0.2% Systematic process and equipment modification
Project pass rates (multiple programmes) 70–88% 93–95% DX45AH, NCM40, Geely G2, 50AH storage — B/C sample to SOP
Annual production cost Baseline −5M+ CNY Cumulative saving from systematic process and equipment improvement
Process team size 10 40 Rebuilt the Zhenjiang site process organisation from the ground up

Prismatic power cells — new line commissioning CITIC Lixin Energy · 2017.04 – 2020.07 · Principal Process Engineer, 30-person team

Metric Before After Note
Core process pass rates Below target ≥99% Across all operations after winding, assembly and filling optimisation
Line capacity Baseline ≈2× 4 GWh Korean-imported automated line, commissioning through to volume

3C pouch cells Zhongshan Tianmao Battery · 2012.03 – 2015.12 · and TCL Jinneng · 2009.07 – 2012.02

Metric Before After Note
Tab defect rate 20% 500 ppm TCL Jinneng — tab defects and cell surface deformation
Process cycle time Baseline −25% Baking, filling and hot-press optimisation
Material cost Baseline −5% Material loss system optimisation
Core operation pass rates Variable ≥99% stable Zhongshan Tianmao — parameter iteration and equipment upgrade

Career Timeline

  • present · XIAMEN TOB NEW ENERGY TECHNOLOGY Co., Ltd.

    Principal Engineer — battery assembly process engineering and production line technical support.

  • 2024.04 – 2024.07 · Envision AESC

    Principal Process Development Expert. Product engineering for prismatic and pouch cell assembly, new process transfer to mass production, and process enablement across global manufacturing sites. Delivered the assembly BOM, process specifications, PFMEA and control plans; led C-sample pilot to mass-production conversion. Built a unified assembly process library across sites, and delivered three improvement programmes at the Jiangyin site covering Lyric line equipment damage, stacking efficiency and aluminium-shell assembly efficiency.

  • 2022.11 – 2024.04 · Geely Technology Lixin Energy

    team 10 → 40 Process Department Head. Full process technical management for prismatic aluminium-shell cells. Rebuilt the Zhenjiang site process organisation from scratch, established role definitions, assessment mechanisms and workflows to meet automotive OEM audit standards. Led DX45AH, NCM40, Geely G2 and 50AH storage programmes from B/C sample through to SOP.

  • 2020.07 – 2022.11 · Wanxiang Technology (Microvast Electronics)

    15-person team Senior Process Manager. Steel-can and pouch cell process optimisation, automated line rollout, and customer quality assurance. Delivered dozens of new products from pilot to mass production for customers including OPPO and Amazon. Built the factory efficiency accounting and trial-production management systems.

  • 2017.04 – 2020.07 · CITIC Lixin Energy

    30-person team Principal Process Engineer. Built the first full set of assembly-section process documentation from nothing — parameter standards, PFMEA, SOPs and control plans. Full participation in acceptance, commissioning and production ramp of a 4 GWh Korean-imported automated line. Developed winding core-extraction improvements, multi-tab bending and electrolyte wetting optimisation.

  • 2016.10 – 2017.04 · Chilwee Chuangyuan Group

    Senior Process Engineer. Participated in the setup of the Fourth Business Division — factory planning, process route design and early process documentation. Led improvement of secondary sealing, formation and packaging operations.

  • 2012.03 – 2015.12 · Zhongshan Tianmao Battery

    Principal Process Engineer. 3C pouch cell process development across electrode preparation, winding, packaging and electrolyte filling. Built the full MI process documentation system from scratch and introduced over one hundred new models into mass production. Led adoption of ultra-thin separator, aluminium-plastic film and tab adhesive materials.

  • 2009.07 – 2012.02 · TCL Jinneng Battery

    PE Process Engineer. Pouch cell assembly process maintenance, defect closure and automation upgrade. Led rollout of automated winding equipment.

Technical Focus

  • ▸Battery assembly process — winding, stacking, electrolyte filling, sealing, formation
  • ▸Yield engineering — root-cause analysis and closed-loop correction of short circuit, leakage, internal resistance and dimensional defects
  • ▸Process documentation systems — process specifications, PFMEA, SOP, control plans, standard work hours
  • ▸New line commissioning — equipment requirement definition, technical agreement review, FAT/SAT acceptance, jig and fixture validation
  • ▸Industrial engineering — line layout, takt time, line balancing, capacity debottlenecking
  • ▸Multi-site process standardisation and technical library development
  • ▸Team building — process organisation design, role definition and assessment systems
PFMEA 8D SOP / Control Plan FAT / SAT IE / Line Balancing CPK NPI Cost Reduction

Frequently Asked Questions

What kind of yield problems does Pinery Gong work on?

Assembly-section defects that sit between process and equipment: electrolyte leakage, internal short circuit, electrode fracture, tab defects, separator misalignment, internal resistance and dimensional deviation. The working method is root-cause analysis with closed-loop correction across winding, stacking, electrolyte filling, sealing and formation — typically taking a defect mode from percentage-level down to parts per million rather than trimming it by a few points.

How was electrolyte leakage reduced from 6% to 60 ppm?

Through a dedicated improvement programme on a core failure mode at Wanxiang Technology (Microvast Electronics), 2020–2022, leading a 15-person process team. The same programme took electrode fracture from 10% to 80 ppm and overall cell pass rate from 75% to 90%. Performed at that employer and presented as career history, not as a performance guarantee for a new project.

How was PACK output raised from 500 to 15,000 units per shift?

A thirty-fold increase achieved through full automation rollout combined with process iteration, at Wanxiang Technology (Microvast Electronics). In the same period PACK pass rate moved from 85% to 99% and total labour cost fell 20% through operation merging, process optimisation and headcount rationalisation. Career history at that employer.

What experience does he have with prismatic aluminium-shell cells?

As process department head at Geely Technology Lixin Energy (2022–2024) he held full process technical management for prismatic aluminium-shell power and storage cells. NCM-manganese cell short-circuit rate fell from 10% to 0.5% through workshop humidity control, bend structure redesign and equipment upgrade; separator misalignment fell from 6% to 0.2%. He led the DX45AH, NCM40, Geely G2 and 50AH storage programmes from B/C sample through to SOP, lifting project pass rates from 70–88% to 93–95%. Career history at that employer.

Has he commissioned new production lines?

Yes. At CITIC Lixin Energy (2017–2020) he took full part in acceptance, commissioning and production ramp of a 4 GWh Korean-imported automated line, roughly doubling line capacity, and built the first complete set of assembly-section process documentation from nothing — parameter standards, PFMEA, SOPs and control plans. Core process pass rates reached 99% or above after winding, assembly and filling optimisation. His new-line work covers equipment requirement definition, technical agreement review, FAT/SAT acceptance and jig validation. Career history at that employer.

Can he build a process organisation, not just fix defects?

Yes. At Geely Technology Lixin Energy he rebuilt the Zhenjiang site process organisation from scratch, growing the team from 10 to 40 engineers and establishing role definitions, assessment mechanisms and workflows to meet automotive OEM audit standards. At Envision AESC he built a unified assembly process library across global manufacturing sites, delivering assembly BOM, process specifications, PFMEA and control plans. Career history at those employers.

Which cell formats has he worked across?

Four: 3C pouch cells (TCL Jinneng and Zhongshan Tianmao, where tab defects fell from 20% to 500 ppm and over one hundred new models were introduced into mass production), steel-can and consumer cells (Wanxiang, delivering products for customers including OPPO and Amazon), prismatic aluminium-shell power and storage cells (Geely Lixin, CITIC Lixin), and prismatic plus pouch assembly at Envision AESC. Career history at the employers named on this page.

Fix a yield problem

Leakage, short circuit, dimensional defects or line throughput — describe the symptom and the engineering team can help diagnose it.

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