The "Final Inspection" of Lithium Battery PACK - Aging Test

The essence of lithium battery aging is a performance degradation process of the chemical system under cyclic charging/discharging or high-temperature environments, involving electrode material structure damage, electrolyte decomposition, SEI film thickening, etc. Aging tests accelerate these reactions to shorten the evaluation cycle. For example, high-temperature environments (such as 55℃-85℃) can speed up side reaction rates, making weeks of testing equivalent to years of actual use.

After the assembly of lithium battery PACK, aging testing via an aging chamber is mandatory before shipment. It is a core link to ensure the safety, reliability, and performance stability of the battery pack. Through test items including cycle life, high/low temperature resistance, storage, and simulated comprehensive environments, potential defects are exposed in advance to eliminate defective products, while the overall performance of the battery pack reaches a stable state.

A lithium battery PACK consists of multiple components such as cells, BMS/protection boards, connectors, casings, and auxiliary materials. Invisible defects may occur during the manufacturing process. These hazards are difficult to detect initially but may quickly lead to failures during product application. The key purpose of aging testing is to expose all defects before the battery pack leaves the factory: For instance, hidden issues at the cell level such as micro-shorts, diaphragm damage, and active material shedding may show normal voltage and capacity in initial tests, but are prone to capacity plummeting, voltage abnormalities, or even leakage and swelling under cyclic charging/discharging or high temperatures. At the structural and connection level, problems like poor welding, loose connections, or excessive contact resistance may cause interface melting and local overheating of the battery pack due to heat accumulation during aging, and in severe cases, local ablation or thermal runaway. BMS protection boards may also have faults such as parameter deviations, balancing abnormalities, or communication interruptions, which can be triggered by abnormal charging/discharging during the aging cycle. With composite tests under multiple conditions such as high temperature, multi-cycle charging/discharging, and standing, the aging process can amplify these early failure risks, enabling precise screening of defective products and preventing unsafe or underperforming products from entering the market and causing safety accidents.

Application scenarios include energy storage batteries and systems, portable outdoor power supplies, home energy storage, solar street lights, industrial and commercial energy storage, and communication base stations.

The performance of lithium battery PACK is often unstable in the initial stage. In particular, the SEI film of the cells may not be fully formed, and there may inevitably be slight performance differences between cells after PACK assembly. The aging process can effectively promote performance stabilization: The SEI film formed after the first charging/discharging of cells may be loose and uneven, and small-current charging/discharging during aging cycles can make the SEI film more stable, reducing capacity degradation in subsequent use (avoiding the "fast power loss" phenomenon when users first start using it). Even after preliminary screening, multiple cells in the PACK may still have subtle differences in capacity and internal resistance. During the aging process, cells with weaker performance will show capacity degradation faster, facilitating further calibration through the balancing function of the BMS and reducing the risk that the entire battery pack is compromised by a single cell in subsequent use.

Lithium battery PACK needs to cope with diverse application environments. Aging tests verify the adaptability of battery packs under different conditions by simulating actual scenarios such as high/low temperatures, continuous operation, and comprehensive application environments. For example, automotive batteries need to withstand high/low temperatures; aging chambers can perform high/low temperature cycles to test the charging/discharging efficiency, capacity retention rate, and BMS adaptability (such as whether low-temperature protection is falsely triggered) of the battery pack under extreme temperatures. Energy storage batteries require long-term voltage stability and self-discharge control under float charging to ensure no rapid power loss or overcharging in actual use.

Both international and domestic standards such as IEC 62133, UN38.3, and GB/T 31467.3 clearly stipulate that lithium battery PACK must complete aging tests before leaving the factory. This is not only a mandatory standard requirement but also a key measure for enterprises to assume product quality responsibility and ensure user safety. More than 20 years of practice by Guihang New Energy has proven that battery packs undergoing sufficient aging tests can reduce the early failure rate by over 99%, significantly helping customers improve product experience/application and enhance brand reputation.

In summary, aging chamber testing is the "ultimate physical examination" of lithium battery PACK before delivery: Although this link requires an additional 1–3 days, it can avoid terminal failures and safety risks from the source, and is an indispensable quality control and core step in the manufacturing system of the lithium battery industry.

Hongda Test Plan

Shenzhen Hongda New Energy Co., Ltd. accurately anchors the core impact of aging testing on the quality of lithium batteries, and launches a series of battery aging testing products, targeting the pain points and needs of the industry. This series of products integrates cutting-edge electronic control and high-precision sensing technology, which can achieve micrometer level parameter control and accurately replicate the charging and discharging environment of the battery under real working conditions; Its voltage/current detection accuracy is as high as ± 0.05% FS, with a dynamic response time of ≤ 10ms, and its performance indicators far exceed industry standards, providing a solid guarantee for the accuracy and reliability of test data. The battery pack that has undergone sufficient aging testing of the device can significantly reduce the early failure rate by more than 99%, which can effectively help customers greatly improve product experience and application performance, and steadily consolidate brand reputation. From research and development to mass production, the Hongda battery aging equipment deeply injects the "safety gene" into the entire life cycle of batteries: not only is it equipped with a triple hardware protection mechanism of overcurrent, overvoltage, short circuit, and explosion-proof, but it also comprehensively safeguards testing safety; More innovative use of energy feedback technology, with a feedback efficiency of over 90%, helps customers significantly reduce energy consumption costs and efficiently respond to the "dual carbon" strategy. With outstanding performance advantages, this device has successfully empowered many leading enterprises such as new energy vehicles, energy storage giants, and consumer electronics leaders, effectively helping customers improve product consistency, successfully passing ISO/CE strict certification, significantly reducing after-sales costs, and demonstrating the strength of hardcore products.