The design of power lithium battery needs to provide the corresponding working power or power supply for the equipment according to the requirements of the power-using equipment. Therefore, the design of power lithium battery must first determine the battery voltage and the required input and output power according to the power demand of the power-using equipment, then optimize the process parameters and compose them into a finished battery pack with certain specifications and indicators. Whether the design of power lithium battery is reasonable, related to the use of battery performance, must be as far as possible to optimize the design.
(A) the design requirements of the power lithium battery
Power lithium battery design, you must understand the power equipment with battery performance indicators and battery conditions, the following aspects should generally be considered:
(1) battery operating voltage.
Battery operating current, i.e., normal discharge current and peak current.
(2) battery operating time.
Including continuous discharge time, service life or cycle life.
3) Battery operating environment.
including the battery working environment and ambient temperature.
(4) the maximum allowable volume of the battery
(a) The maximum volume of the finished battery placement allowed by the space reserved for the battery in the equipment.
Lithium-ion power lithium battery due to its excellent performance, the use of an increasingly wide range, sometimes to be applied to some special occasions, and thus there are some special requirements, such as shock resistance, vibration, high and low temperature resistance, low air pressure, etc.. In considering the above basic requirements, while also considering the source of materials, the determinants of battery characteristics, battery performance, battery manufacturing process, technical and economic analysis and environmental temperature.
(B) How to evaluate the performance of power lithium batteries important indicators
Power lithium battery performance is generally evaluated by the following aspects:
1) Capacity.
Battery capacity refers to the power that can be obtained from the battery under certain discharge conditions, that is, the integration of current to time, generally expressed in Ah, which directly affects the maximum working current and working time of the battery.
(2) Discharge characteristics and internal resistance.
Battery discharge characteristics refers to the battery in a certain discharge regime, the smoothness of its working voltage, the high and low voltage plateau and high current discharge performance, etc., which indicates the battery's ability to carry a load. Battery internal resistance includes ohmic internal resistance and electrochemical resistance, and the influence of internal resistance on the discharge characteristics is especially obvious when discharging at high current.
3) Operating temperature range.
The working environment and use conditions of electricity-using equipment require the battery to have good performance in a specific temperature range.
4) Storage performance.
After a period of storage, the battery will change its performance due to the influence of certain factors, resulting in self-discharge, electrolyte leakage, battery short circuit, etc.
5) Cycle performance.
Cycle life refers to the secondary battery in accordance with a certain system of charging and discharging, its performance decay to a certain degree when the number of cycles, it is important to affect the life of the battery
6) Safety performance.
Importantly, the battery is abused in the conditions of how the battery's safety performance, abuse conditions include overcharging, short circuit, pinprick, extrusion, hot box, heavy impact, vibration, etc., the good or bad performance of anti-abuse is the primary condition to determine whether the battery can be used in large quantities.
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