Overcharge experiment analysis of the LiFePO4/C battery with prelithiation technology
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Abstract Prelithiation technology can improve the service life of batteries, but whether it will affect the safety of batteries has not been studied. In this paper, the temperature differences between LiFePO 4 /C batteries with prelithiation technology and conventional LiFePO 4 /C batteries in overcharge test are analysed, the shell deformation values of these two types of batteries are compared, and the influence of battery capacity retention rate on overcharge safety of batteries is discussed. The analysis shows that there is no obvious difference in overcharge safety between two types of batteries, and batteries with prelithiation technology are similar to conventional batteries in terms of shell deformation value, the highest temperature of shell and the temperature fluctuation of flue gas escaping from pressure relief valve.Keywords:
Overcharge
Service life
Positive‐grid corrosion rates measured at several temperatures over a range of potentials corresponding to overcharge conditions show that voltage depression at the positive plate of but a few hundredths of a volt can result in corrosion rates decreasing by factors of one ‐third to one‐half or more. Silver and cobalt when added directly to the electrolyte of batteries on SAE Overcharge Life Test depolarize the positive plate overcharge voltage, resulting in increased overcharge life. An identical series of reactions is proposed to explain the depolarizing effects of silver and cobalt. Overcharge corrosion does not play a major role in governing the service life of passenger car batteries. The SAE Overcharge Life Test cannot be expected to evaluate the effects of silver and cobalt on service life.
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The effect of overcharge performance of Lithiun ion battery was summarized by suming up the affecting factors such as active materials of cathode,charge regime, additives of overcharge protection,thermal stability etc,of the overcharging tolerance of the batteries.It is pointed out that prevent the safety hazard through optimizing hot stability of the anodal material and rational system of charging and discharging.The main measures of improving overcharge performance was adaptive overcharge protecting additive.
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Thermal Runaway
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Finite linear diffusion model for design of overcharge protection for rechargeable lithium batteries
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Internal resistance
Thermal Runaway
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Electroactive polymers
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Overcharge
Service life
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Protection of battery cells from overcharge and from over-discharge is an important criteria for the successful operation of battery cells over long lifetimes. Battery level charge control based on cell level parameters also improves battery operation. Circuitry to perform both of these functions has been developed by TRW Systems under contract with the Wright-Patterson Air Force Base Aero Propulsion Laboratory on the 2 KW Long Life Battery Program, Air Force Contract No. F33615-70-C-1627 and on several earlier programs.
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According to the imbalance problem of battery charging,this paper makes a design of battery equalization charging system.This system not only can ensure that each monomer battery can be charged,but also can guarantee that the whole group battery overcharge phenomenon will not occur. This system overcomes the adverse effects of the battery life caused by battery inconsistency,and improves the effective utilization rate of the battery capacity.
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The cells in the battery are affected by materials,production process,and the environmental temperature,during the using period,and their voltage unbalance may occur.The problem gradually increasing that will make the battery overcharge and the overdischarge damage leading to the battery pack can't work normally.The technology of transfering battery equalization introduced.It can completely solve the problem from the external battery that the voltage imbalance in the battery seriously affecting the battery service life.The technology using the active balancing technology makes the voltage difference between the adjacent batteries minimum.The technology research project has been proved by practice.
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