I. Testing-Related Standard System
The technical specification system for battery charge-discharge testers is well-established, primarily based on national metrological technical specifications and power industry standards to form core guidelines. Additionally, specialized testing standards have been developed for niche fields such as telecommunications and new energy vehicles, comprehensively covering equipment testing and calibration needs across diverse application scenarios.
(1) Power Industry Standards
The key dedicated standard in the power sector is DL/T 1397.2-2014 “General Technical Conditions for Test Equipment Used in DC Power Systems—Part 2: Battery Capacity Discharge Testers,” issued by the National Energy Administration and officially implemented on March 1, 2015.
This standard complements other supporting standards within the DL/T 1397 series, which include technical specifications for battery internal resistance testers, individual battery activation devices, and related equipment. Together, they establish a complete standard framework for test equipment used in power DC systems, serving as the core reference for the development, inspection, and operation and maintenance of battery testing equipment in power applications.
(2) National Metrological Technical Specifications
The primary national metrology standard is JJF 2039-2023 “Calibration Specification for Battery Charge-Discharge Testers,” officially implemented on December 30, 2023. This specification clearly defines its scope, covering calibration work for battery charge-discharge testers operating within voltage ranges of 1 V to 1 kV and current ranges of 1 mA to 3 kA. Battery chargers and battery capacity testers may also follow this specification for calibration. By integrating multiple national-level metrological regulations, it effectively ensures the standardization, data accuracy, and traceability of measurement values in battery testing equipment calibration.
(3) Sector-Specific Standards
In the telecommunications industry, the YD/T 2344 series of standards establishes specialized testing requirements for phosphate iron lithium battery packs used in communications. These standards define core test items including charge-discharge performance, rated capacity, and cycle life, tailored specifically to backup power applications in telecommunication systems.
In the new energy vehicle sector, a draft of dedicated battery testing and calibration specifications has been developed, establishing standardized requirements for onboard battery pack charge-discharge detection systems. Applicable to test systems with voltages not exceeding 1500 V and currents not exceeding 2000 A, this fills the gap in standardization for high-power automotive batteries in new energy vehicles.
II. Battery Charge-Discharge Testing Methods and Technical Requirements
(1) Verification Discharge Test
The verification discharge test is a critical method for accurately assessing a battery’s actual capacity and evaluating its operational condition. The entire process must adhere to constant-current discharge principles, typically conducted using the I₁₀ standard constant current. The test environment temperature should be maintained between 5°C and 45°C, and the test site must be equipped with adequate ventilation and fire safety facilities.
Two standardized execution modes are available, depending on the battery configuration: For single-battery bank systems, the test can be terminated when the discharge reaches 50% of the rated capacity and the individual cell voltage does not fall below 1.9 V; for dual-battery bank systems, discharge continues until the termination voltage of individual cells reaches 1.8 V.
Regarding maintenance cycles, newly installed or overhauled battery banks must undergo full verification discharge tests to ensure deployment quality. During normal operation, verification discharge tests should be performed every 2 to 3 years. After six years of operation, the frequency should increase to annual testing. If, after three complete charge-discharge cycles, the battery bank’s capacity remains below 80% of its rated capacity, it is considered to have reached performance degradation criteria and should be replaced promptly.
(2) Core Functional Requirements for Charge-Discharge Testers
Battery charge-discharge testers compliant with industry and metrology standards must integrate intelligent, end-to-end testing capabilities to meet various battery operation and inspection requirements. Key functional configurations include: 1. Smart Charging Function: Features a fully automatic three-stage charging mode—constant current → constant voltage → trickle float charging—supporting customizable core parameters such as equalization voltage, float voltage, charging current, and charging duration. The device autonomously completes the entire charging process, adapting to the charging characteristics of various types of batteries.
2. Multi-Mode Constant Current Discharge Function: Supports multiple discharge control modes including constant current, constant power, and constant resistance, enabling simulation of complex real-world battery operating conditions. The equipment incorporates multiple safety shutdown criteria, including test completion, target discharge capacity reached, individual cell protection voltage triggered, or group battery protection voltage triggered. Automatic shutdown occurs upon meeting any one condition, ensuring safe operation during testing.
3. Real-Time Online Monitoring Function: Continuously collects, records, and stores key operational data for both battery banks and individual cells, including voltage, working current, and battery temperature throughout the entire process, providing comprehensive data support for subsequent analysis and status assessment.
4. Battery Activation and Restoration Function: Allows customization of charge-discharge cycle counts, enabling cyclic activation of degraded or less active battery banks through repeated charge-discharge cycles. This effectively repairs mild battery aging issues and restores battery performance.
(III) Key Metrological Requirements
In accordance with national metrology calibration standards, all core parameters of the battery charge-discharge tester must meet precise error tolerances. Calibration procedures must also comply with specific environmental and reference instrument requirements. Specific technical specifications are as follows:
Maximum allowable error for charge/discharge voltage: ±(0.02%FS ~ 0.5%FS);
Maximum allowable error for charge/discharge current: ±(0.05%FS ~ 0.5%FS);
Maximum allowable error for charge/discharge time: ±0.1%;
Maximum allowable error for charge/discharge capacity: ±(0.1% ~ 5.0%);
Current switching controllable range: 1 ms ~ 100 ms;
Maximum allowable error for temperature measurement: ±1.0 ℃.
The maximum allowable error or measurement uncertainty of the calibration reference instruments must not exceed one-third of the corresponding parameter’s maximum allowable error of the device under test, ensuring accurate and reliable calibration results. Calibration operations must be conducted in a standard environment with ambient temperature controlled at (25±5)℃ and relative humidity maintained between 15% and 90%.
III. Application Practice and Technological Development Trends
(I) Core Application Scenarios
Battery charge-discharge testers are widely used across multiple industries for energy storage and backup power testing, particularly in critical applications such as DC power systems in substations, backup power supplies for communication base stations, UPS battery banks in data centers, and new-energy storage power stations. They serve as essential diagnostic tools for ensuring the safe and stable operation of battery systems and accurately assessing battery lifespan.
(II) Industry Technology Development Trends
Battery charge-discharge testing technology continues to evolve rapidly, advancing toward higher precision, green energy efficiency, and intelligent lifecycle management. Key development trends can be summarized into three main dimensions:
1. Extreme Testing Accuracy: New-generation testing equipment continuously optimizes measurement algorithms and hardware configurations, enabling precise detection of microamp-level current changes even at minimum scales. Core voltage measurement accuracy can reach ±0.1%FS, meeting the testing demands of advanced energy storage batteries, high-precision battery R&D, and fine-grained maintenance operations.
2. Green and Energy-Efficient Testing: High-frequency, high-power regenerative testing technologies are increasingly adopted, allowing effective recovery and reuse of electrical energy generated during battery discharging. Equipment energy recovery rates can exceed 90%, significantly reducing energy consumption and losses in large-scale, high-power battery testing, achieving efficient and eco-friendly testing.
3. Full Lifecycle Testing Integration: Testing systems have evolved into comprehensive frameworks covering the entire battery lifecycle—from cell manufacturing and factory inspection to field operation, retirement performance verification, and recycling. A closed-loop testing and management system has been established, ensuring consistent performance stability and safety control throughout the battery’s life cycle.
The use, calibration, and inspection of battery charge-discharge testers must strictly comply with current national metrology standards and industry-specific regulations. Through standardized verification discharge tests, precise metrological calibration, and comprehensive equipment functional configuration, the accuracy and reliability of battery test data can be effectively ensured. This provides scientific and standardized technical support for daily operation and maintenance, performance evaluation, and replacement assessment of battery banks across various applications, contributing to the safe, stable, and efficient operation of energy storage and backup power systems.
Post time: Aug-06-2026