A. Energy Regeneration Technology —— Revolutionary Upgrade Traditional Pain Points: Old discharge testers convert battery energy into heat and dissipate it (large fans with loud noise, severe heat generation, energy waste). Testing a 1000Ah battery is equivalent to boiling hundreds of kettles of water, and requires air conditioning for cooling. 2026 Status: Mainstream high-end equipment adopts bidirectional inverter technology. During discharge, the battery's DC is inverted to AC and fed back to the grid without distortion. Advantages: Energy saving of over 90%, no heat island effect, no need for large cooling fans, quiet and environmentally friendly. Test costs are significantly reduced. B. AI-Driven Battery Health Diagnosis (AI-SOH) Multidimensional Data Analysis: No longer just looking at cutoff voltage. The equipment has built-in AI algorithms that comprehensively analyze discharge curve slope, temperature rise rate, internal resistance change trends, and cell voltage differences. Fault Prediction: Can identify potential faults such as "micro-short circuits", "plate softening", and "electrolyte drying" in advance, and provide intelligent decisions like "recommend replacement" or "recommend activation", rather than a simple "pass/fail". Cloud Digital Twin: Test data is uploaded to the cloud platform in real-time, establishing a full lifecycle profile of the battery, comparing historical data, and predicting remaining useful life (RUL). C. Modular Parallel Connection and Wireless BMS Integration Unlimited Expansion: Modular design (e.g., each module 20A/50A) allows easy parallel connection to achieve any current output from 10A to 2000A, adapting to needs from small UPS to giant energy storage stations. Wireless Cell Monitoring: Eliminates cumbersome cell voltage collection wires. Uses wireless RF or LoRa technology to automatically collect voltage and temperature of each cell, reducing wiring time from 30 minutes to 3 minutes, and eliminating the risk of short circuits in collection wires. D. Safety Strategies for Lithium Batteries For lithium iron phosphate (LFP) and ternary lithium (NMC) batteries, built-in dedicated BMS communication protocols (CAN/RS485) are included. The tester can directly read battery cluster BMS data. Once the BMS alarms (e.g., over-temperature, over-voltage), the tester cuts off the circuit in milliseconds to ensure absolute safety. 3. Detailed Explanation of Main Test Types Table Test Type Purpose Operation Method Applicable Standards Capacity Verification Test Verify whether the battery meets the rated capacity (e.g., 100% C10) Discharge at 10-hour rate current (I10) to the end voltage, record time GB/T 19638, DL/T 724 Full Capacity Discharge Deep detection to find all weak cells Discharge until battery pack protection activates or reaches 100% depth New installation acceptance, after major repair Shallow Capacity Discharge Routine inspection, quick assessment Discharge 30%-40%, estimate total capacity from curve Annual/quarterly preventive tests Activation Charge Repair weak cells, eliminate sulfation First discharge then charge, or use pulse charge-discharge cycles When capacity is found insufficient Internal Resistance Test Quickly screen deteriorated cells Inject AC signal to measure impedance, no discharge needed Monthly inspections 4. Key Selection Indicators (2026 Edition Guide) Table Indicator Dimension Recommended Parameters/Requirements Description Voltage Range Cover 12V - 500V (or higher) Need to adapt to 48V communication, 110V/220V power, 400V energy storage systems, etc. Discharge Current 1A - 1000A+ (modular adjustable) Resolution needs to reach 0.1A, accuracy ±0.5% Energy Regeneration Essential (efficiency >90%) Strongly recommend regenerative type, energy-saving and environmentally friendly, reduces on-site cooling pressure Cell Monitoring Wireless collection (supports 2V/6V/12V/lithium) Number of channels must match the number of cells in series (e.g., 108 cells, 240 cells) Cooling Method Intelligent temperature-controlled air cooling / silent design Noise <60dB, suitable for computer room environments Safety Protection Reverse connection protection, over-temperature protection, low voltage cutoff, BMS linkage Must have multiple hardware protections Data Interface Wi-Fi/5G/Ethernet, supports cloud upload Convenient for generating automated reports 5. Operation Process and Safety Warnings Standard Process Preparation: Check battery pack appearance, clean terminals; connect tester main circuit (positive and negative poles); install wireless cell voltage/temperature sensors. Parameter Setting: Input battery pack rated capacity, number of cells, end voltage (e.g., 1.80V/cell), discharge current (e.g., 0.1C). Pre-check: The equipment automatically detects wiring polarity and cell voltage balance. If a cell voltage is abnormally low, prompt to handle it first. Start Test: Offline Mode: Disconnect the mains switch, close the tester switch, and the battery begins discharging. Online Mode: Close the tester switch, the equipment automatically shares the load, and the battery slowly discharges. Real-time Monitoring: Observe total voltage, current curve, and lowest cell voltage. Once any cell reaches the end voltage, the equipment should automatically alarm and stop (or switch to charging). Charge Recovery: After the test, immediately use the tester or original charger to perform equalizing charge on the battery pack to replenish capacity. Report Generation: The equipment automatically generates a detailed report including capacity, internal resistance, and list of weak cells. Important Safety Warnings Prevent DC Short Circuit: DC system short-circuit current is extremely large and can produce strong arcs. When wiring, always connect the negative pole first, then the positive pole; when disconnecting, remove the positive pole first, then the negative pole. Be sure to use insulated tools. End Voltage Setting: Strictly prohibit over-discharge! Over-discharge of lead-acid batteries can cause irreversible plate damage. The cell end voltage must be strictly set (usually 1.80V or 1.85V). Heat Dissipation and Ventilation: Even regenerative equipment generates some heat, and batteries release hydrogen gas during discharge (lead-acid), so ensure good ventilation on site and strictly prohibit open flames. Online Test Risk: When conducting online parallel tests, confirm that the tester's inverter output is synchronized with the grid to prevent circulating current impact. Non-professionals are advised to use offline testing. Lithium Battery Specifics: When testing lithium battery packs, the BMS communication line must be connected, relying on the BMS as the final protective barrier to prevent thermal runaway. 6. Mainstream Brands in the Market (2026 Reference) International Brands: Megger (UK): Its BITE series is known for high-precision wireless cell monitoring and powerful analysis software, setting the benchmark in the global high-end market. Hioki (Japan): Leading in battery internal resistance testing and rapid diagnosis technology, with compact and portable equipment. Chroma (Chroma ATE, Taiwan): Holds a significant market share in regenerative charge-discharge test systems, especially in lithium battery and energy storage testing. Leading Domestic Brands: Wuhan Haomai Electric, Wuhan Huatian Electric, Baoding Tianwei Group's instrument factory: Domestic equipment is highly competitive in large-capacity regenerative technology and cost-effectiveness. Their wireless cell monitoring technology is very mature and widely used in State Grid and China Southern Power Grid bidding projects. Guangzhou Zhiyuan Electronics: Has deep accumulation in battery analyzers and embedded test modules. Shenzhen Kelu/Autowell: Outstanding in cluster testing solutions for large energy storage power stations. 7. Quick Reference for Common Fault Diagnosis Severely Insufficient Capacity (<80%): If the entire group is low → → The battery pack is aging overall and needs to be replaced as a whole. If individual cells are low → → That cell has internal short circuit, open circuit, or severe sulfation. Try activation repair; if ineffective, replace the single cell (note: mixing old and new batteries requires caution, preferably from the same batch). Sudden Voltage Drop During Discharge: Usually indicates shedding of active material from plates or excessive contact resistance in connectors. Excessive Temperature Rise: Sign of internal micro-short circuit or electrolyte drying, with risk of thermal runaway; stop the test immediately.
