软包锂离子电池用铝塑膜成形性能研究

doi:10.19562/j.chinasae.qcgc.2024.07.003

Abstract

Abstract:

To ensure the reliability of aluminum-plastic film encapsulation for lithium-ion batteries， strict control of the aluminum layer thickness after forming is necessary. However， obtaining the thickness relies heavily on physical experiments， resulting in high cost for both early design optimization and later production process quality monitoring. In this paper， a combination of physical experiments and simulation modeling is adopted to establish a constitutive equation that can well characterize the mechanical properties of the pouch during forming. Additionally， a prediction method for the aluminum layer thickness based on the overall aluminum-plastic film thickness is proposed， enabling precise prediction of the aluminum-plastic film and aluminum layer thickness after forming. Furthermore， based on simulation Design of Experiments （DOE）， key influencing factors are screened to construct a response surface model， facilitating rapid prediction and optimal parameter matching design for different products， which also provides a solution for online monitoring of forming quality during production. The results show that the multi-layer composite aluminum-plastic film exhibits obvious anisotropy during the plastic stage. The 3-parameters Barlat-Lian constitutive model effectively represents the anisotropic properties of the film， and outperforms the single-directional elastic-plastic model， achieving accurate prediction of the aluminum-plastic film performance after forming. The constructed response surface model can replace the refined finite element model， and have excellent prediction accuracy for the thickness of the composite aluminum-plastic film and the aluminum layer， with an error less than 5%. By optimizing the process parameters， the formed thickness of the aluminum layer can be increased by 10%~20%. The integrated development application APP can meet the requirements for quick design evaluation， parameters optimization， and online monitoring of the forming quality.

Key words: lithium-ion batteries, aluminum-plastic film, pouch forming, anisotropy, response surface, prediction and optimization

Daolin Deng. Study on Forming Performance of Aluminum-Plastic Film for Pouch Lithium-Ion Batteries[J].Automotive Engineering, 2024, 46(7): 1157-1166.

Figures/Tables 24

a/μm	b/mm	r/mm	$L 0$ /mm	$L c$ /mm	$L t$ /mm	B/mm	$h 1$ /mm	h/mm
153	15	25	50	90	160	30	20	15

方向	E/MPa	$ν$	抗拉强度/MPa	断裂应变
0°			120.8	0.68
45°	6 000	0.31	113.2	0.54
90°			116.0	0.49

E/MPa	$ν$	m	r₀	r₄₅	r₉₀
6 000	0.31	6	1.234	4.227	1.075

项目	试验值	仿真MAT36	仿真MAT24
材料参数	弹性	E=6000 MPa， $ν = 0.31$
	塑性曲线	0°/45°/90°	0°	45°	90°
	各向异性	m、r₀、r₄₅、r₉₀ 见表4
角位铝塑膜厚度/μm	99	98	84	87	90
角位铝层厚度/μm	24.2	24	19.8	20.7	21.5

References 21

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凸模	长度/mm	宽度/mm	顶边圆角/mm	侧边圆角/mm	顶边棱角/mm
凸模	208.9	116.5	2	5	2
凹模	长度/mm	宽度/mm	圆角/mm	棱边圆角/mm
凹模	209.8	117.4	0.8	2.15
配合参数	压边力/N		凹凸模间隙/mm		中间茎宽/mm
配合参数	70 000		0.45		0.4

参数名称		低水平	高水平
冲压深度	A	5	10
凹凸模间隙	B	0.35	0.7
凸模顶边R角	C	1	3
凸模侧边R角	D	5	10
凸模棱边R角	E	1	3
凹模R角	F	0.8	1.8
中间茎宽	G	0.3	0.6

序号	A/mm	B/mm	C/mm	D/mm	E/mm	F/mm	G/mm	A角位铝塑膜厚度/μm	A角位铝层厚度/μm
1	5	0.35	1	5	1	0.8	0.3	117.52	29.48
2	10	0.7	1	10	1	0.8	0.3	114.17	28.51
3	10	0.7	3	10	3	1.8	0.6	116.63	29.22
4	5	0.7	1	10	3	0.8	0.6	129.58	32.97
5	10	0.35	1	10	3	1.8	0.3	112.21	27.95
6	5	0.35	1	10	1	1.8	0.6	132.67	33.86
7	10	0.7	3	5	3	0.8	0.3	104.33	25.67
8	10	0.35	3	5	1	1.8	0.3	103.63	25.47
9	5	0.7	3	5	1	0.8	0.6	127.46	32.35
10	10	0.35	1	5	3	0.8	0.6	97.25	23.62
11	5	0.35	3	5	3	1.8	0.6	131.13	33.41
12	5	0.7	3	10	1	1.8	0.3	141.88	36.52
13	10	0.7	1	5	1	1.8	0.6	101.29	24.79
14	5	0.7	1	5	3	1.8	0.3	126.33	32.03
15	10	0.35	3	10	1	0.8	0.6	113.50	28.32
16	5	0.35	3	10	3	0.8	0.3	130.88	33.34
17	7.5	0.525	2	7.5	2	1.3	0.45	114.92	28.73

来源	自由度	平方和	均方和	F值	P值
合计	16
模型	12	2 592.7	216.1	525.3	0.000
线性	7	2 514.0	359.2	873.2	0.000
A	1	1 901.8	1 901.8	4 623.7	0.000
B	1	32.8	32.8	79.7	0.001
C	1	92.1	92.1	224.0	0.000
D	1	426.0	426.0	1 035.8	0.000
E	1	0.9	0.9	2.2	0.215
F	1	60.3	60.3	146.6	0.000
G	1	0.1	0.1	0.3	0.605
2因子交互作用	4	64.6	16.2	39.3	0.002
AC	1	9.1	9.1	22.1	0.009
AD	1	19.0	19.0	46.2	0.002
AF	1	30.4	30.4	74.0	0.001
AG	1	6.1	6.1	14.9	0.018
弯曲	1	14.0	14.0	34.1	0.004
误差	4	1.65	41

参数名称		Model_1	Model_2
凸模	长度/mm	208.9	135
	宽度/mm	116.5	83.5
	凸模顶边R角/mm	2	2
	凸模侧边R角/mm	5	6
	凸模棱边R角/mm	2	1.8
凹模	长度/mm	209.8	136.2
	宽度/mm	117.4	84.7
	凹模R角/mm	0.8	1.8
	棱边R角/mm	2.15	1.95
	中间茎宽/mm	0.4	0.6
配合	凹凸模间隙/mm	0.45	0.6

Study on Forming Performance of Aluminum-Plastic Film for Pouch Lithium-Ion Batteries

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Figures/Tables 24

References 21

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