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Dongguan Juneng New Energy Technology Co., Ltd.
137 5142 6524（Miss Gao）
susiegao@power-ing.com
Xinghuiyuan High tech Industrial Park, Dalang Town, Dongguan City, Guangdong Province
A Power Battery PACK Engineer’s 365-Day Ceanza
time：2026-08-03
In July, 2025, Li Ming graduated from a 985 college majoring in materials science and engineering. With a vision for the new energy industry, Li Ming joined the Energy New Energy PACK division. One year later, he has been independently responsible for the process optimization of an energy storage battery package production line. Turning over his Ceanza, we can get a glimpse of how the new energy source forged a fresh graduate into an independent engineer.
First day: production line rotation, from "paper talk" to "down-to-earth"
on the first day of his entry, Li Ming did not enter the office, but changed into ESD coat and stood next to the cell sorting production line.
"Be an operator for three months first. "Mentor-a senior process engineer with 15 years of experience-told him," people who don't know the production line can't design reliable processes. "
in the first month, Li Ming learned the parameter standard of cell matching group, the power curve of laser welding, and the trajectory control of structural adhesive coating. He found that the "optimal parameters" in textbooks often do not work on production lines-cell batch fluctuations of incoming materials, seasonal changes in environmental temperature and humidity, and precision drift caused by equipment wear, flexible adjustment of process parameters is required.
"Once, I set the welding power according to the standard parameters, and as a result, air holes appeared in the weld. "Li Ming recalled," the old master glanced at it and said, 'Today the humidity is 85%, and the power should be reduced by 5% '. This kind of experience cannot be learned in the laboratory. "
day 90: Project and Post, understand the system in actual combat
after the rotation, Li Ming was assigned to a project team of energy storage battery pack, serving as an assistant engineer.
His first task was to optimize the usage of a battery pack thermal pad. The seemingly simple "thin glue layer" actually moves the whole body with one focus-the glue layer is thinned by 0.1mm, the thermal resistance increases, and the temperature difference between cell may exceed the standard; The thinned by 0.2mm, the structural strength decreases, and stratification may occur in vibration test. Li ming used two weeks to establish a three-dimensional model of adhesive layer thickness-thermal resistance-structural strength, and found the optimal solution through DOE (experimental design): gradient gluing is adopted in specific areas, center thickness, the edge is thin, the overall glue consumption is reduced by 12%, and the thermal performance is improved by 3% instead.
"This project makes me understand that PACK engineers are not 'adjusting parameters', but 'balancing paradoxs '. "Li Ming wrote in his diary," cost, performance, safety and manufacturability are always playing games. "
day 180: cross-departmental collaboration to understand "customer voice"
half a year later, Li Ming participated in a customized project for vehicle factory customers. This is the first time that he has faced the needs of customers and realized the gap between "technical language" and "business language.
Customers require "20% reduction in charging time", but are unwilling to increase costs. Li Ming's initial understanding was to "improve the charging rate", but the thermal management team fed back the liquid cooling system to the limit; The BMS team warned that the high rate would accelerate the attenuation; The procurement team pointed out that the price of the high rate cell increased by 15%.
Finally, Li Ming proposed the scheme of "segment fast charge"-the first 50% SOC is charged at 2C, and the second 50% is reduced to 1C, in conjunction with the intelligent preheating strategy. The overall charging time is shortened by 18%, and the cost is only increased by 2%, which is readily accepted by customers.
"That meeting made me understand that the value of engineers is not to achieve the ultimate in technology, but to translate technology into the benefits of customers. "
270 days: independent responsibility, from executor to decision maker
in the ninth month, Li Ming was appointed as the process director of an energy storage production line. This means that he will shift from "completing the task" to "defining the task".
The first challenge he faced was that the transformation time of the production line was as long as 4 hours, which seriously affected the delivery efficiency of multiple orders. Li Ming led the five-member team to analyze the bottleneck with the value flow chart and found that 80% of the time was wasted on the replacement of tooling and fixtures and manual input of parameters. He promoted the development of "quick change system"-the fixture adopts standardized interface and Magnetic positioning, and the parameters are automatically distributed through two-dimensional code. The transformation time was reduced from 4 hours to 45 minutes, and the OEE of the production line increased by 12%.
"Being independent and responsible means that when there is no standard answer, you have to draw the answer yourself. "Li Ming sighed with emotion.
Three hundred sixty-five days: looking back and moving forward
on the first anniversary of joining the company, Li Ming wrote such a passage in the diary:
"A year ago, I thought PACK engineer is 'making batteries'. Now I know that we are 'system-building'-cell, structure, thermal management, BMS, process, and cost are indispensable. The new energy source did not cultivate me into a 'screw', but let me see how the whole machine works. "
this year, he experienced four stages: production line rotation, project actual combat, cross-departmental collaboration and independent responsibility, and completed the transformation from students to engineers. However, the talent training system for gathering energy and new energy is still planning the next step for him: next year, he will go to the German technology center for further study to learn the latest functional safety standards in Europe; Three years later, he is expected to be promoted to project manager, leading the full-cycle delivery of overseas customers.
Contact us
Dongguan Juneng New Energy Technology Co., Ltd.
137 5142 6524（Miss Gao）
susiegao@power-ing.com
Xinghuiyuan High tech Industrial Park, Dalang Town, Dongguan City, Guangdong Province
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