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　　The so-called battery cell refers to a single electrochemical cell containing positive and negative electrodes, which are generally not directly used. Unlike batteries that contain protective circuits and enclosures, they can be used directly. The composition of lithium-ion rechargeable batteries is usually as follows: battery cells+protective circuit boards. Removing the protective circuit board from the rechargeable battery is the battery cell. The battery cell is the storage part of a rechargeable battery. The quality of the battery cell directly determines the quality of the battery. However, in the world of mobile power sources, what we usually refer to as mobile power cells generally includes the protection of circuit boards. In fact, the accurate term should be called lithium-ion batteries. In short, don't worry about distinguishing these details.

　　There are three types of battery cells: aluminum shell cells, soft pack cells (also known as "polymer cells"), and cylindrical cells. Usually, mobile phone batteries use aluminum shell cells, while digital products such as Bluetooth often use soft pack cells. Laptop batteries use a series parallel combination of cylindrical cells.

　　Lithium ion batteries are a type of rechargeable battery that primarily rely on lithium ions moving between the positive and negative electrodes to operate. During the charging and discharging process, Li+is intercalated and de intercalated back and forth between the two electrodes: during the charging cell, Li+is intercalated from the positive electrode and embedded into the negative electrode through the electrolyte, leaving the negative electrode in a lithium rich state; When discharging, the opposite is true. Batteries that generally use materials containing lithium as electrodes are representative of modern high-performance batteries.

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