From the energy point of view, a device that directly converts other forms of energy into DC power is commonly called a battery. Batteries can be divided into primary batteries and secondary batteries according to whether they can be reused. Non-rechargeable batteries are called primary batteries; rechargeable batteries are called secondary batteries. The exact definition of a secondary battery: using the reversibility of chemical reactions, a new battery can be assembled, that is, after a chemical reaction is converted into electric energy, the chemical system can be repaired with electric energy, and then the chemical reaction is converted into electric energy. A battery with the above characteristics is called a secondary battery. Generally speaking, the secondary battery refers to a battery that can be used to activate the active material by charging after the battery is discharged. Lithium Cell refers to the most basic electrochemical unit containing lithium (metallic lithium, lithium alloy and lithium ion, lithium polymer) in the electrochemical system. Lithium batteries can be roughly divided into three categories: lithium metal batteries, lithium ion batteries and lithium ion polymer batteries. (1) : The lithium battery in the strict sense is a lithium primary battery (lithium metal battery), which contains pure lithium metal. Lithium primary batteries are generally batteries that use manganese dioxide as the positive electrode material, metal lithium or its alloy metal as the negative electrode material, and use a non-aqueous electrolyte solution. For one-time use, it is a battery. (2) Li-ion batteries (Li-ion Batteries) are secondary batteries that do not contain metallic lithium. Lithium-ion batteries generally use lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolyte. It mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to transfer charge, thereby forming an electric current. (3) Lithium-ion polymer batteries: It is a secondary lithium battery pack
that uses colloidal or solid polymer instead of liquid organic solvents, and has good safety. Also known as lithium polymer battery'. Traditionally, secondary lithium-ion batteries are referred to as lithium-ion batteries, and lithium-ion batteries are also referred to as lithium batteries.u003c/pu003e
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