Development and application of a LFP pouch cell module

doi:10.19799/j.cnki.2095-4239.2021.0557

Abstract

Abstract:

The cell module is the key component of an electric vehicle battery system, providing the energy output for the vehicle. In this study, we describe a lithium iron phosphate (LFP) pouch cell module with high energy density and high safety factor. The basis for improving battery system effectiveness and vehicle driving range lies in enhancing volume utilization and group efficiency. To improve volume utilization and bunching efficiency, we investigated the cell module in detail, both internally and externally. From an external perspective, we considered integration with the battery pack envelopes developed by mainstream vehicle manufacturers. From this analysis, we suggest configurations of cell modules to optimize the utilization of battery envelope space and propose a scheme for increasing the height of standard LFP pouch cell modules. We obtained the maximum pouch cell envelope size using theoretical mathematical formulas. Increasing the pouch cell size allows improved volume utilization in the cell modules, with corresponding increases in bunching efficiency and cell module capacity. We then simulated the lightweight cell module by finite element modeling. Once the simulated strength met the stipulated requirements, reliability experiments (e.g., for vibration and impact) were conducted to assess the safety performance of the cell module. Our conclusions are that the goals of high energy density and high safety can both be achieved, assuming a certain energy density. These findings lay the foundation for future popularization and practical application of LFP pouch cells.

Key words: pouch cell module, energy density, volume utilization, bunching efficiency, size chain

CLC Number:

U 469.72

Hengfei LU, Xingwu XU, Shengbin LING, Yongkuan SHEN. Development and application of a LFP pouch cell module[J]. Energy Storage Science and Technology, 2022, 11(5): 1468-1474.

Figures/Tables 11

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References 6

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名称	前期厚度(高度)范围/mm	现阶段厚度 (高度)范围/mm	现阶段选取厚度(高度)/mm
电池箱包络	130～150	130～150	135
电池箱盖	2～5	1～3	2
电池箱体	8～12	3～5	4
热管理装置	10～12	5～7	6
预留间隙	3～20	2～10	3
电池模组	108	—	120

名称	尺寸/mm	公差/mm
模组长度	390	(-1,0)
电芯长度A0	—	—
电气压板厚度A1	1	(-0.1，0.1)
铜排厚度A2	2	(-0.1，0.1)
固定孔加两侧端板壁厚尺寸A3	13	(-0.1，0.1)

名称	尺寸/mm	公差/mm
电芯高度C0	—	—
采集装置厚度C1	0.8	±0.1
预留间隙C2	0.2	±0.2
上下盖板厚度C3	1	±0.1
胶层高度C4	1	±0.2

	加宽电芯	标准电芯
能量密度/(Wh/kg)	200	200
长度/mm	357	354
宽度/mm	116	102
厚度/mm	11.8	11.8
电芯本体长度/mm	321	314
容量/Ah	60	52

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