Lithium-ion batteries (LIB) provide high energy density, low self-discharge rate, long cycle life, and superior suitability for a wide range of applications, such as portable electronic devices, electric vehicles, and renewable energy systems. In this investigation, we prepared 18650 LIB cells with various discharging rates (1C, 2C, 3C, and 4C) using specified conditions for static discharging experiment, and recorded the battery discharge current (), discharge time (), central surface maximum temperature (), temperature fluctuation, discharge capacity (), discharge energy (), and voltage at different time intervals. We studied the association between the discharge rate and the thermal stability of LIB specimens. In the discharge process, it was observed that operating at an increased discharge rate exhibited a direct correlation with a higher temperature rise. The findings indicate that batteries prepared with a higher discharge rate exhibit greater instability in terms of inherent property. During the 4C discharge rate, the , , and values were 96.6 °C, 3.117 Ah, and 9.021 Wh, respectively. These results indicate that a discharging rate of 4C is inappropriate for batteries, while the discharging rates of 1C, 2C, and 3C are suitable in terms of thermal stability.

中文翻译：

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18650锂离子电池在不同放电倍率下的热危害评估

锂离子电池 (LIB) 具有高能量密度、低自放电率、长循环寿命以及优异的适用性，适用于便携式电子设备、电动汽车和可再生能源系统等广泛应用。本次研究中，我们制备了不同倍率（1C、2C、3C、4C）的18650锂离子电池，在规定的条件下进行静态放电实验，记录了电池的放电电流（）、放电时间（）、中心表面最高温度（ )、不同时间间隔的温度波动、放电容量()、放电能量()、电压。我们研究了锂离子电池样品的放电速率和热稳定性之间的关系。在放电过程中，观察到以增加的放电速率运行与较高的温升直接相关。研究结果表明，以较高放电倍率制备的电池在固有性能方面表现出更大的不稳定性。在4C倍率放电期间， 、 、 和 值分别为96.6℃、3.117Ah和9.021Wh。这些结果表明，4C的放电倍率对于电池来说是不合适的，而1C、2C和3C的放电倍率在热稳定性方面是合适的。