Resistance exterior force property of lithium‐ion pouch batteries with different positive materials

Abstract

Summary Lithium‐ion pouch battery (LIPB) is widely applied in different engineering fields, such as electric vehicles, aeronautics, astronautics, and among others. However, few complete mechanical models with deformation field are presented to predict internal short circuit (ISC) and resistance exterior force property of LIPB under exterior loading. In the present research, the indentation theoretical models with sinusoidal shape function are established to investigate resistance exterior force property of batteries with different positive materials under different punch shapes loading. The effects of indentation displacement and deformation region on indentation force are carried out. By the comparison of indentation force, present theoretical and numerical results are consistent with previous experimental results. The indentation force increases with the punch radius increase, but decreases with the indentation displacement increase. On the basis of energy conservation law, it is concluded that LIPB is more likely to produce mechanical failure and ISC when normalized deformation region is greater than or equal to 0.4 and plastic strain energy ratio is greater than or equal to 1.5. In addition, from resistance exterior force property point of view, LIPB has a better property to resist external force when LiMnNiCoO2, rather than LiCoO2 and Nanophosphate, is used as positive material. The research provides a reference for assessing the safety of LIPB and selecting suitable positive material, which possesses high energy capacity and resistance exterior force property.

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“…[1][2][3][4][5][6][7][8][9][10] Lithium-ion battery (LIB) is the best comprehensive rechargeable battery system software at this stage. 3,[11][12][13][14][15][16][17][18][19][20][21][22][23] At present, LIB is mainly used in mobile electronic equipment, and its application has begun to develop to the small size and lightweight of microelectrical appliances, as well as large electric equipment. [24][25][26][27][28] By contrast with traditional LIB materials such as LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiFePO 4 , and so on.…”

“…With the globalization of economic development and the improvement of energy supply, finding new energy storage devices has become focused attention of the new energy technology industry 1‐10 . Lithium‐ion battery (LIB) is the best comprehensive rechargeable battery system software at this stage 3,11‐23 . At present, LIB is mainly used in mobile electronic equipment, and its application has begun to develop to the small size and lightweight of microelectrical appliances, as well as large electric equipment 24‐28 .…”

Self-Polymerized Dopamine Nanoparticles Modified Separators for Improving Electrochemical Performance and Enhancing Mechanical Strength of Lithium-Ion Batteries

“…LIBs mainly consist of positive electrodes, negative electrodes, electrolytes, and macromolecular separators. The separators are placed between positive and negative electrodes to protect against an internal short circuit and provide favorable channels for lithium ions migration [8]. When separators suffer mechanical failure under external loading, the lithium dendrites may puncture the separators, leading to an internal short circuit or even the explosion of the batteries, due to direct contact between positive and negative electrodes [9,10].…”

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“…Lithium-ion battery (LIB) has received considerable attention as a popular electrochemical energy source for a wide range of applications, including electric vehicles and cell phones, and so on [1,2]. Many researchers strove to develop the electrochemical performance [3][4][5] and mechanical properties [6,7] of batteries both experimentally and by simulation. The LIB mainly consists of a positive electrode, negative electrode, and separator, and the separator is set up between positive and negative electrodes to prevent internal short circuit [8,9].…”