摘要
在单体电池的生产制造过程中,细微的不一致性(品控问题)及长期充放电运行过程中的复杂因素导致电池组工作时出现单体电池的电压、内阻和SOC不一致,进一步加剧了电池组性能的不均衡。这种不一致性可能引发类似于“木桶效应”的情况,其中劣化最严重的电池单体影响整个电池组的性能,甚至导致电池组报废,缩短了使用寿命。蓄电池在充放电过程中的特性变化包括内阻的变化,因此需要确保每个单体的特性在充放电过程中同步变化,即每个蓄电池单体的充放电特性曲线是重合或接近重合的。尽管核容试验关注整组电池容量和规定放电时长后单体电压是否达标,但缺乏对蓄电池动态特性曲线的充分反映。现存的异常单体一致性测试方法基于硬性标准和大数据,不适用于同组运行电池组的单体异常查找,也存在简便性的不足。
Due to subtle inconsistencies in the production process of individual batteries(quality control issues)and the complex factors affecting long-term charge-discharge operations,the inconsistency of voltage,internal resistance,and State of Charge(SOC)of individual batteries in a battery pack is further exacerbated during operation.This inconsistency,due to the“barrel effect”of battery pack performance,can lead to the most degraded battery cell causing the entire battery pack to be scrapped,thereby shortening the overall lifespan of the battery pack.The characteristics of rechargeable batteries change during the charge-discharge process,such as the internal resistance composed of ohmic polarization(conductive resistance)and electrochemical polarization resistance,and concentration polarization resistance.As the resistance changes during charge-discharge,it is desirable that the characteristics of each cell in the battery pack change synchronously during the charge-discharge process,meaning that the charge-discharge characteristic curves of each battery cell overlap or are close to overlapping.Capacity testing only focuses on whether the individual voltages meet standards after specified discharge times,lacking the reflection of dynamic characteristic curves of rechargeable batteries.Existing methods for testing abnormal cell consistency are based on rigid standards and big data,making them unsuitable for identifying anomalies in cells within a battery pack operating as a unit.Moreover,they lack simplicity.
作者
庞世论
黄仁俊
唐家淳
王家铧
PANG Shilun;HUANG Renjun;TANG Jiachun;WANG Jiahua
出处
《电力系统装备》
2024年第4期16-18,共3页
Electric Power System Equipment
关键词
单体电池
不一致性
充放电特性曲线
电池组性能
individual battery
inconsistency
charge-discharge characteristic curves
battery pack performance
