储能科学与技术2025，Vol.14Issue(6)：2488-2497,10.DOI:10.19799/j.cnki.2095-4239.2024.1210
储能电池模组膨胀力特性研究及仿真分析
Research and simulation analysis of swelling force characteristics in energy storage battery modules
樊慧敏 1彭浩鸿 1孟辉 1唐梦宏 1易昊昊 1丁静 1刘金成 1徐成善 2冯旭宁2
作者信息
- 1. 惠州亿纬锂能股份有限公司,广东 惠州 516006
- 2. 清华大学,北京 100084
- 折叠
摘要
Abstract
Swelling force is an important parameter for evaluating the performance and safety of LiFePO4(LFP)energy storage batteries,which is affected by the state of charge(SOC)and state of health(SOH)of the battery.However,the evolution and mechanisms of swelling forces over the full lifecycle of high-capacity LFP batteries are not well understood.In this study,we investigated the swelling force variation in a 280 Ah LFP battery under constrained conditions,which was assembled into modules with different string numbers.In addition,we analyze the behavior of the swelling force under full SOC and lifecycle.The results demonstrate that the swelling force changes with the SOC of the battery during a single cycle.Because of the structural characteristics of graphite and lithium iron phosphate materials,during charging,two swelling peaks emerged at approximately 30%and 100%SOC,and two peaks emerged at 100%and 30%SOC during discharging.These peaks evolved with the battery degradation.At 100%SOC,the force gradually changes from maximum to minimum value of the battery ages,whereas at 30%SOC,the force gradually becomes the largest.In addition,after the SOH dropped to approximately 90%,the expansion force exhibited a linear correlation with the SOH.The swelling force growth trend was maintained as the series count increased,and the maximum expansion force of the 1P12S module reached 2365 kgf at 70%SOH.Based on the measured data,the simulation analysis of the swelling force of the module indicates that the design of the module's main components meets the structural safety requirements throughout its lifecycle.This study preliminarily explores the swelling force characteristics of the LFP battery modules,providing a reference for swelling force simulations at the module level.Furthermore,this study provides support for the safe design and development of LFP battery modules in energy storage systems.关键词
磷酸铁锂电池/膨胀力/储能模组/SOC/SOHKey words
LFP battery/swelling force/energy storage module/state of charge(SOC)/state of health(SOH)分类
信息技术与安全科学引用本文复制引用
樊慧敏,彭浩鸿,孟辉,唐梦宏,易昊昊,丁静,刘金成,徐成善,冯旭宁..储能电池模组膨胀力特性研究及仿真分析[J].储能科学与技术,2025,14(6):2488-2497,10.
