Interpretation of the structural characteristics of the lithium battery pack. Lithium battery pack is the core of the stored energy in the lithium battery UPS, its importance is self-evident. Today, the storage of electric small series will bring you the structural characteristics of the lithium battery pack. Interpretation.
Lithium battery pack structure
Lithium battery packs generally include a positive electrode, a negative electrode, an electrolyte, a separator, a positive lead, a negative lead, a center terminal, an insulating material, a safety valve, a sealing ring, a positive temperature control terminal, a battery case, and the like.
▉ positive
The positive electrode material occupies a large proportion in the lithium battery pack (the mass ratio of the positive and negative materials is 3:1~4:1), because the performance of the positive electrode material directly affects the performance of the lithium battery pack, and the cost directly determines the battery pack. The cost is high and low.
Bismuth electrolyte
As an important part of the lithium battery pack, the electrolyte plays the role of transporting ion conduction current between the positive and negative electrodes. The selection of a suitable electrolyte is also a lithium battery pack with high energy density and power density, long cycle life and good safety performance. The essential.
Diaphragm
In the structure of the lithium battery pack, the diaphragm is one of the key inner layer components. The performance of the diaphragm determines the interface structure, internal resistance, etc. of the battery pack, which directly affects the capacity, cycle and safety performance of the battery pack. It plays an important role in improving the overall performance of the battery.
The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two poles from contacting and short-circuit, and also have the function of allowing electrolyte ions to pass.
Closer to home, talking about the structural characteristics of the lithium battery pack, in addition to its physical structure, its chemical properties are also the content of this small series.
Chemical characteristics of lithium battery packs
▄ charging voltage
Charging voltage refers to the power supply of the lithium battery pack when it is charged. The external voltage is added to the power supply at both ends of the battery. Therefore, before charging the lithium battery pack, it is best to confirm the charging voltage. The long-term use of the inconsistent voltage charging will seriously affect its use. life.
▄Battery capacity
Battery capacity refers to the amount of electricity obtained from the battery. It is usually indicated by C. The unit is usually represented by Ah or mAh. Capacity is an important indicator of the electrical performance of lithium batteries.
The capacity of the battery pack is determined by the capacity of the electrode. If the capacity of the electrode is not equal, the capacity of the battery depends on the electrode with a small capacity, not the sum of the positive and negative electrodes.
▄Storage performance
One of the main features of the lithium battery pack is that it can discharge electrical energy when in use, and can store electrical energy when not in use. This performance of storing electrical energy is a good charge retention capability for lithium battery packs.
▄cycle life
For lithium battery packs, the length of service life is an important parameter to measure its performance.
Lithium battery packs have reasonable conditions and range of use, such as charge and discharge cutoff voltage, charge and discharge ratio, operating temperature range, storage temperature range, etc. If long-term unreasonable use, it will cause irreversible chemical reaction inside the battery, resulting in battery mechanism The destruction, accelerate the aging of the battery, resulting in a rapid decline in cycle life, in serious cases, it will also cause a safety accident.
