Lithium Batteries Knowledge
The protection function of lithium-ion battery is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the charging and discharging circuit under the environment of -40℃ to +85℃. It can control the on-off of the current loop in time; PTC prevents the battery from being damaged badly in a high temperature environment.
Lithium ion batteries use liquid electrolytes, while polymer lithium batteries use gel electrolytes and solid electrolytes......
1. Types of rechargeable batteries: Nickel-cadmium battery (Ni-Cd), Ni-MH battery (Ni-MH), Lithium ion battery (Li-lon), Li-polymer battery (Li-polymer), Lead-acid battery (Sealed) ...
2. Explanation of battery charging performance terms...
1. The ratio of positive and negative materials for lithium-ion batteries should be reasonable. Since the active materials of the positive and negative electrodes are fixed on the substrate by the binder, the long-term stability of the binder and the good mechanical properties of the battery can delay the decline of the battery life, so to improved the positive electrode material's chemical stability and thermal stability is one of the feasible methods to maintain battery life.
Large-scale energy storage: Generally, comprehensive factors such as environmental protection, service life, and floor space are involved. Generally, it is recommended to use lithium iron phosphate battery cells, especially large-capacity lithium iron phosphate batteries;
Small energy storage: generally 26650, 32650 lithium iron phosphate battery cells can be selected;
Small power: Generally, you can choose the same battery as the small energy storage, or you can choose a relatively safe ternary material system battery; you can take into account the volume ratio energy and weight ratio energy issues;
What are the common positive and negative materials in the lithium-ion battery industry? The main constituent materials of lithium-ion batteries include electrolytes, separator materials, and positive and negative electrodes. Cathode materials and anode materials are one of the key materials that determine the performance of lithium-ion batteries, and are also the main source of lithium ions in current commercial lithium-ion batteries. Their performance and valence have a greater impact on lithium-ion batteries.
The voltage of a lithium ion battery is determined by the electrode potential. Voltage, also known as potential difference, is a physical quantity that measures the energy difference of electric charges in an electrostatic field due to different potentials. The electrode potential of lithium ion is about 3V, and the voltage of lithium ion batteries varies with different materials. For example, a general lithium-ion battery has a rated voltage of 3.7V and a full-charge voltage of 4.2V; while a lithium iron phosphate battery has a rated voltage of 3.2V and a full-charge voltage of 3.65V. In other words, the potential difference between the positive electrode and the negative electrode of a lithium-ion battery in practical use cannot exceed 4.2V, which is an element based on material and use safety.
The current ternary batteries basically refer to ternary lithium-ion batteries, including ternary soft pack batteries and ternary 18650 batteries. How about ternary lithium-ion batteries? The following describes its performance characteristics from the aspects of ternary battery materials, voltage, and energy density.
High-rate polymer lithium-ion battery, let's first understand the concept of rate. How to understand the discharge rate? The discharge rate refers to the current value required by the battery to discharge its rated capacity within a specified time. The data value is equal to the multiple of the battery's rated capacity, usually represented by the letter C. Generally speaking, if the C number is greater than 1, it means a high rate. High rate is a relative concept. The larger the C number of a lithium-ion battery, the higher the rate of the battery.
Due to the wide application of lithium batteries in portable electronic products, coupled with the continuous expansion of the demand for lithium batteries in the electronic product market, many large and small lithium battery manufacturers have been born, and which brand of lithium batteries is good has become an electronic product buyers often have to consider issues, because the quality of lithium battery brands will directly affect the competitiveness and survival cycle of their end products in the market and the space for profit.