The emergence of low-cost energy storage batteries in the industry is essentially the result of the combined effect of multiple factors such as cost, technology, market competition, and compliance risks. The specific analysis is as follows from several dimensions:
I. Cost Side: Degradation of Materials and Processes
Downgrading of Battery Cell Materials
Some low-cost products use recycled lithium iron phosphate materials, low-nickel ratio ternary materials, or even mix inferior lithium manganate to replace high-specification cathode materials; for the anode, defective artificial graphite or natural graphite is adopted, leading to a significant decline in energy density and cycle life.
Cutbacks in BMS and PACK Processes
Necessary balanci
ng boards and temperature sensors are omitted, or low-precision protection boards are used, resulting in inadequate safety and consistency of the battery system; in the PACK process, structural components are reduced and heat dissipation designs are simplified to further compress costs.
Supply Chain Scale and Inventory
Small and medium-sized manufacturers reduce costs by purchasing inventory battery cells and used modules, or clear inventory at low prices during the window period of falling upstream material prices to ship quickly.
II. Technology Side: Adoption of Outdated or Obsolete Solutions
Outdated Technology Routes
Some low-cost products still use outdated solutions such as lead-acid converted to lithium-ion and small-capacity series-parallel connection instead of mainstream technologies like lithium iron phosphate large modules or CTP (Cell to Pack), with performance and lifespan far below industry standards.
Skipping Verification Links
Necessary reliability tests (such as high-low temperature cycling and vibration impact) are skipped, and even third-party certifications (such as UL and CE) are not obtained to save testing and certification costs.
III. Market Side: Competition and Channel Driven
Industry Overcapacity
The production capacity of energy storage batteries has grown explosively in recent years. To compete for orders, small and medium-sized manufacturers resort to dumping below cost, especially in fragmented markets such as household energy storage and small industrial and commercial energy storage.
White Label and Non-Branded Competition
Non-branded manufacturers rely on low prices to achieve high sales volume, lacking investment in R&D and services. They mainly sell through cross-border e-commerce, small and medium-sized distributors and other channels to avoid competition from branded manufacturers.
Subsidy and Policy Arbitrage
There are loopholes in energy storage subsidy policies in some regions. Some manufacturers obtain subsidies through "fake energy storage" projects (such as low cycle times and false capacity declarations), and their products only meet the minimum acceptance standards.
IV. Risk Side: Hidden Costs and Compliance Issues
High Safety Risks
Low-cost batteries are more prone to problems such as thermal runaway, bulging, and fire, which may lead to high after-sales and compensation costs in the future.
False Labeling of Lifespan and Performance
The nominal cycle life is 5,000 times, but the actual number may be less than 2,000; the nominal capacity is 10kWh, but the actual usable capacity is only 7-8kWh, resulting in higher long-term use costs.
Compliance and Environmental Risks
Some products have not passed environmental certifications such as RoHS and REACH, and may face customs detention and fines when exported; discarded inferior batteries will also bring environmental pollution problems.
Risk Identification Checklist for Low-Cost Energy Storage Batteries | |||
Risk Dimension | Verification Points | Risk Identification Methods | Potential Risk Consequences |
I. False Labeling Risk of Technical Parameters | 1. Nominal capacity (Wh/Ah). 2. Cycle life (times). 3. Charge-discharge rate (C). 4. Operating temperature range. 5. Internal resistance and voltage consistency | 1. Actual capacity test: Conduct charge-discharge tests with professional equipment and compare with nominal values (deviation > 10% indicates false labeling). 2. Cycle test: Randomly sample for 50-100 charge-discharge cycles and observe capacity attenuation rate (excessive attenuation indicates insufficient lifespan). 3. Internal resistance detection: The internal resistance deviation of battery packs in the same batch should be < 5%. | 1. Actual endurance is far lower than expected. 2. Short battery lifespan, frequent replacement increases costs. 3. Failure to work normally in high/low temperature environments. |
II. Cost-Cutting Risk in PACK Process | 1. Battery cell sorting and grouping. 2. Thermal management component configuration. 3. Structural parts and insulation protection4. Completeness of BMS functions | 1. Dismantling and random inspection: Check if battery cells have sorting marks and if cells in the module are from the same batch. 2. Thermal management inspection: Verify whether heat sinks, thermal conductive glue, and temperature control sensors are equipped (often omitted in low-cost products). 3. BMS test: Simulate overcharge, over-discharge, and short-circuit scenarios to verify if protection functions take effect. 4. Observation of structural parts: Shell thickness, copper busbar material (inferior products often use thin copper busbars and brittle plastic). | 1. Poor cell consistency, local. overheating causes bulging and fire. 2. Insulation failure leads to electric leakage and short circuit. 3. BMS malfunction, unable to ensure charge-discharge safety. |
III. Inferior Battery Cell and Material Risk | 1. Battery cell type and source. 2. Cathode material specifications. 3. Whether recycled/used battery cells are used. | 1. Request battery cell supplier qualifications and procurement documents. 2. Battery cell composition testing: Test cathode materials through third-party institutions (e.g., lithium iron phosphate purity, ternary nickel-cobalt-manganese ratio). 3. Visual inspection: Check for scratches or refurbishment traces on the battery cell surface. | 1. Recycled battery cells are prone to thermal runaway, with extremely high safety hazards. 2. Insufficient material purity results in poor energy density and stability. |
IV. Lack of Certification and Compliance Risk | 1. Warranty period and scope. 2. After-sales service outlets. 3. Supplier qualifications and production capacity | 1. Review warranty terms: Low-cost products often only provide 3 months to 1 year of warranty, excluding battery cell wear and tear. 2. Verify suppliers: Confirm if they have formal factories and R&D teams to avoid OEM small workshop products. 3. Understand production capacity: Suppliers with excessively low production capacity are prone to unstable supply and inadequate after-sales support. | 1. Unable to repair or replace batteries after failure. 2. Supplier absconds, leaving no way for subsequent maintenance. 3. Supply delays during bulk purchases. |
