FACTORY · PRODUCTION & QC
Production & Quality Control: From Cell Inspection to Shipment
LiHua Lighting is a source factory, so the same company that designs your product also assembles, tests and ships it. This page shows how an order moves through our Jiangmen Factory and Shenzhen Factory, from the LiFePO4 cells coming in to the cartons going out.
Two factories, one team
Jiangmen Factory – energy storage & lighting
No.17 Keyuan West Road, Jianghai High-tech Zone, Jiangmen, Guangdong, China
Shenzhen Factory – custom LED displays
Custom LED displays, poster screens and pole screens, built to order.
Our production and quality-control process, step by step
- Cell sourcing. Grade A lithium iron phosphate (LFP) cells from tier-1 manufacturers such as CATL, EVE, Sunwoda, CALB and Ganfeng. Every pack uses cells from one manufacturer, one batch and one production date.
- Incoming inspection and consistency sorting. Cells are tested for capacity, AC internal resistance and open-circuit voltage before they are grouped. See the details below.
- Terminal cleaning. Oxide and oil are removed from the cell terminals before welding or fastening.
- Series/parallel assembly. 3.2V LiFePO4 cells are configured in series and parallel to reach the voltage and capacity the project needs.
- BMS fitting and wiring. Each custom pack gets a BMS matched to its application, with sampling lines, balancing lines and temperature sensors routed and placed for accurate readings.
- Battery testing. Finished packs are tested in-house before they move on.
- Aging test. Products are run for a period before final inspection, so that early failures show up in the factory and not at your site. Aging tests are carried out at our Jiangmen Factory.
- Lighting & display production. Lighting is built on the SMT and assembly lines at our Jiangmen Factory and checked there with waterproof and temperature tests. Custom LED displays are produced at our Shenzhen Factory.
- Final quality control. Every order is inspected and tested before it leaves the factory.
- Packing & shipping. Goods are packed, in your own branded packaging for OEM orders, and shipped once the balance is paid.
Before mass production, a sample is built for your approval. Energy storage samples take 15–20 days.
LiHua Lighting Energy Storage Battery Packs: Strict Batch and Model
A LiFePO4 pack is only as good as its weakest cell. If one cell holds less charge or has higher resistance than its neighbours, it limits the whole pack and ages faster. That is why we control which cells go together before assembly starts.
One manufacturer, one batch, one production date
We never mix cells within a pack. Every cell in a pack comes from the same manufacturer, the same production batch and the same production date, so the cells start life with the same chemistry and the same history.
Three-point consistency sorting before grouping
Before grouping, every cell is measured in a professional capacity testing cabinet and sorted on three values:
- Capacity: the capacity difference between cells in a group is typically controlled within 1% or 3mAh, so all cells reach full and empty at the same time.
- AC internal resistance (ACIR): differences are kept very small, at the milliohm level. When resistance varies between cells, the higher-resistance cells heat up more at high current, which creates local hot spots and uneven ageing.
- Open-circuit voltage (OCV): after the cells have settled, the voltage difference within a group is generally below 5mV.
Clean terminals for low contact resistance
Before welding or fastening, oxide and oil are cleaned off the cell terminals. A clean contact surface keeps contact resistance to a minimum, so connections stay cool under load.
Series and parallel configuration to your specification
Our packs are built from 3.2V LiFePO4 cells, connected in series for voltage and in parallel for capacity. For example, 16 cells in series give a 51.2V nominal pack, and adding parallel strings raises the amp-hour rating. The configuration is set to the voltage and capacity your system needs.
BMS wiring that reads accurately
- BMS voltage-sampling lines and balancing lines are routed away from the high-current main circuit, to avoid electromagnetic interference and false alarms.
- NTC temperature sensors are placed at the hottest, least-cooled spot of each module, so the BMS reacts to the real worst-case temperature.
A battery pack is more than cells combined: a matched BMS
Every custom pack is fitted with a BMS chosen for its application. Depending on the use case, it provides:
- Overcharge and over-discharge protection
- Overcurrent and short-circuit protection
- Temperature monitoring
- Cell balancing
- Charging management
Specifications are for reference only. Please confirm with our sales team before ordering.
Battery cells and cycle life
Rated cycle life for our LiFePO4 batteries is 6000 cycles, tested under industry standard conditions. Where a model’s datasheet states its own figure, the datasheet applies.
Specifications are for reference only. Please confirm with our sales team before ordering.
Inside our Jiangmen Factory: workshop photos
All photos in this section were taken in our own workshops at the LiHua Lighting Jiangmen Factory.
Frequently asked questions
How do you match cells in a LiFePO4 battery pack?
Every pack uses cells from one manufacturer, batch and production date. Before grouping, each cell is measured in a capacity testing cabinet and sorted on three values: capacity (difference typically controlled within 1% or 3mAh), AC internal resistance (milliohm-level differences) and open-circuit voltage after settling (generally below 5mV).
Why does each custom battery pack need its own BMS?
A battery pack is more than cells combined. The BMS is matched to the application and, depending on the use case, provides overcharge, over-discharge, overcurrent and short-circuit protection, temperature monitoring, cell balancing and charging management.
Do you assemble the battery packs yourselves?
Yes. LiHua Lighting assembles its LiFePO4 battery packs in-house.
Which battery cells go into your packs?
Grade A lithium iron phosphate (LFP) cells, sourced from tier-1 manufacturers such as CATL, EVE, Sunwoda, CALB and Ganfeng. Rated cycle life is 6000 cycles, tested under industry standard conditions.
Is every order inspected before shipment?
Yes. Quality control and testing is a fixed step before shipment for every order. If your market needs specific certifications, they can be obtained on request.
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We reply to every inquiry within 24 hours.
Email: sales@mileds.com