In order to apply fast charging in 5th generation (5G) mobile telecommunication, smart phones need to be used at higher current. As the resistance of battery pack increases, the charging time, heat generation, and capacity loss increase in proportion to the charging/discharging current. Thus, a low resistance battery pack is essential. Herein, we proposed a new lithium (Li)-ion battery pack consisting of a low-resistance battery cell and protection circuit module (PCM) for Galaxy S10 5G application. The battery cell reduced current density and resistance by loading level of active material and electrode thickness. The resistance of PCM was also reduced by employing low-resistance circuit components and printed circuit board. It lowered resistance to 51 mΩ compared to 71 mΩ of the battery pack for Galaxy S10. For 5G mobile telecommunication and 25 W fast charging, the charging current should be increased from 3 to 5.7 A and the width of the PCM should be increased 2.45 times, but the low-resistance components and optimization pattern design maintain 2.9 mm PCM width without decreasing capacity of battery pack. The experiment results showed that reducing the resistance of the battery pack by 26 mΩ reduced full charging time by 27 minutes and increased discharging time by 1 minute. The low-resistance battery pack met the standard of UL2054 and heating temperature of smart phone. The optimal charging method was also proposed by comparing the charging capacity, charging time, and heat generation by charging current. The proposed charging method reduced the existing 153 minutes of full charging time to 126 minutes. The smart phone with low-resistance battery pack was able to manage the maximum heating temperature below 43.1°C when charging with a 25 W charger. In addition, 0.2 C discharging capacity was 99.3% (4369.5 mAh) compared to the initial capacity after 400 cycles. After 400 cycles, the direct current internal resistance of the battery pack increased, but no Li precipitation was observed on the electrode. This could be applied to a smart phone employing Samsung Electronics' first 1.3 C fast charging for Galaxy S10 5G in the world's first 5G mobile telecommunication.

中文翻译：

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智能手机低内阻锂离子电池组的设计与特性及其快速充电方法

为了在第五代（5G）移动通信中应用快速充电，智能手机需要在更高的电流下使用。随着电池组电阻的增加，充电时间、发热和容量损失与充放电电流成正比增加。因此，低电阻电池组是必不可少的。在此，我们为 Galaxy S10 5G 应用提出了一种由低电阻电池芯和保护电路模块 (PCM) 组成的新型锂 (Li) 离子电池组。电池单元通过活性材料的负载水平和电极厚度降低了电流密度和电阻。PCM的电阻也通过采用低电阻电路元件和印刷电路板来降低。与 Galaxy S10 电池组的 71 mΩ 相比，它将电阻降低到 51 mΩ。5G移动通信和25W快充，充电电流从3增加到5.7A，PCM宽度增加2.45倍，但低阻元件和优化图案设计保持2.9mmPCM宽度不减电池组的容量。实验结果表明，电池组电阻降低 26 mΩ，完全充电时间减少 27 分钟，放电时间增加 1 分钟。低内阻电池组符合UL2054标准和智能手机加热温度。通过比较充电容量、充电时间和充电电流产生的热量，提出了最佳充电方法。建议的充电方法将现有的 153 分钟充满电时间减少到 126 分钟。配备低电阻电池组的智能手机在使用 25 W 充电器充电时能够将最高加热温度控制在 43.1°C 以下。此外，与 400 次循环后的初始容量相比，0.2 C 放电容量为 99.3%（4369.5 mAh）。400次循环后，电池组的直流内阻增加，但电极上未观察到锂析出。这可以应用于采用三星电子在全球首个 5G 移动通信中为 Galaxy S10 5G 提供的第一个 1.3 C 快速充电的智能手机。电池组直流内阻增加，但电极上未观察到锂析出。这可以应用于采用三星电子在全球首个 5G 移动通信中为 Galaxy S10 5G 提供的第一个 1.3 C 快速充电的智能手机。电池组直流内阻增加，但电极上未观察到锂析出。这可以应用于采用三星电子在全球首个 5G 移动通信中为 Galaxy S10 5G 提供的第一个 1.3 C 快速充电的智能手机。