Full
Outline
The effects of applied mechanical stress on the electro-mechanical properties of stacked-pouch lithium-ion batteries are comprehensively investigated at the full cell level. A series of characterization experiments of electro-mechanical behaviors were conducted based on two experimental platforms, i.e., a free expansion bench and a constant-displacement fixture. Phase transition-dependent swelling phase diagrams were established by differential voltage, swelling thickness and force curve analysis, effectively correlating the electrochemical phase transition reaction with swelling properties. The effect of C-rate on the swelling thickness and force was concentrated in the Stage 2-2L phase transition phase, while the initial preload force will mainly affect the amount of curve stretching of the swelling force without affecting the shape of the swelling curve. This was mainly attributed to the initial preload force dependence of elastic modulus. As an assemblage of composite porous materials, the cell had stress-relaxed viscoelastic properties, and it was further found that the stress relaxation was correlated with various factors such as SOC (state-of-charge), C-rate and initial preload force. For the electrical properties, it was found that the initial preload force had a significant effect on the maximum available capacity, C-rate capacity and internal resistance. Experimental results show that the ohmic internal resistance decreased with an increase in the initial preload force, but the opposite was true for the maximum available capacity. Therefore, it was inferred that the dependence of the initial preload force for the C-rate capacity was dominated by the maximum available capacity. A full range of electro-mechanical performance analysis plays a key role for batteries in pack applications.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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