Patent
Method of building battery DC inner resistance function
Wei Liu,Geng Yang,Zhichao He +2 more
TLDR
In this paper, a method of building a battery DC inner resistance function is presented, which comprises the following steps: corresponding battery inner resistance data of a battery under different battery SOCs (State of Charge), multiple different charging/discharging currents and multiple different ambient temperatures are acquired; according to the acquired battery inner resistances data, a function of the battery dc inner resistance relative to the battery SUs, the charging and discharging currents, and the ambient temperatures is built; a heat production model, a heat transfer model and a heat dissipation model for the battery are builtAbstract:
The invention provides a method of building a battery DC inner resistance function. The method comprises the following steps: corresponding battery DC inner resistance data of a battery under different battery SOCs (State of Charge), multiple different charging/discharging currents and multiple different ambient temperatures are acquired; according to the acquired battery DC inner resistance data, a function of the battery DC inner resistance relative to the battery SOCs, the charging/discharging currents and the ambient temperatures is built; a heat production model, a heat transfer model and a heat dissipation model for the battery are built, and according to the heat production model, the heat transfer model and the heat dissipation model, the surface temperature of the battery is predicted in real time; and according to the function of the battery DC inner resistance relative to the battery SOCs, the currents and the ambient temperatures and the surface temperature of the battery, a function of the battery DC inner resistance relative to the battery SOCs, the charging/discharging currents and the surface temperature of the battery is built. The function relationship between the battery SOCs, the current and the surface temperature of the battery and the battery DC inner resistance can be described simply, comprehensively, accurately and in real time, realization is easy, and engineering applications are facilitated.read more
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Patent
DC internal resistance measuring method and device of battery
TL;DR: In this paper, a DC internal resistance measuring method and device of a battery is presented, where discharging performance test is carried out on a first battery at different ambient temperatures to obtain current values and voltage values corresponding to different states of charge; the current value and voltage value corresponding to each state of charge are calculated according to a battery equivalent circuit model.
Patent
Power battery temperature prediction system and method
Rong Changru,Sun Huanli,Wang Shuyang,Wang Wenting,Xu Lichao,Liu Yixin,Zhao Ziliang,Jiang Tao,Meng Xiangyu,Ren Yi,Dou Zhi +10 more
TL;DR: In this paper, a power battery temperature prediction system was proposed, which includes an acquisition module and a temperature prediction module, and a key temperature parameter is determined according to multi-objective functions such as the flux ofa lithium ion intercalation reaction, the attenuation amount of the battery capacity and the low-temperature heating charging time, and temperature prediction is performed.
Patent
Internal resistance detection system and method based on weighting compensation degree factor
TL;DR: In this article, a storage battery internal resistance detection system and method based on a weighting compensation degree factor was presented, where sine voltage excitation signals, storage battery temperature parameters, and discharging current parameters are acquired, processed through a signal conditioning circuit and then sent to an MSP430 single-chip microcomputer to carry out data processing.
Patent
Method for performing quick statistics on DC internal resistance under different temperatures and SOC of secondary battery
Xiong Hui,Li Yunjie,Xu Bangnan +2 more
TL;DR: In this paper, a method for performing quick statistics on DC internal resistance under different temperatures and SOC of a secondary battery is proposed, where low-volume testing is performed on batch of secondary batteries by utilizing a rule that the DCR ratios of the secondary battery under two different temperatures are basically same under the same SOC in the DC internal resistances testing of thesecondary battery.
Patent
Method for testing battery SOC-OCV curve and equipment for testing battery SOC-OCV curve
TL;DR: In this paper, a method for testing a battery SOC-OCV curve was proposed, and the method comprises the following steps of charging the battery to the upper limit voltage with a constant current of 0.15C to 0.25C to obtain a first charge curve, wherein the upper-limit voltage refers to the voltage when the battery is fully charged; discharging the battery, with the constantcurrent to obtain the first discharge curve, where the termination voltage referred to the lowest voltage when a battery is discharged.
References
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Patent
Lithium ion battery internal temperature monitoring method
Song Shigang,Lin Yong +1 more
TL;DR: In this article, Li ion battery internal temperature monitoring method is presented, which is simple and easy to implement, small in estimation error and capable of well meeting the requirement for monitoring the battery's internal temperature in real time.
Patent
Nondestructive diagnosis of battery performance
TL;DR: In this paper, a method for determining battery performance according to direct-current internal resistance of a battery, which is calculated according to a transient voltage jump difference value and instantaneous current of a lithium ion battery and a battery pack at the beginning or ending of charging and discharging, is presented.
Patent
Lithium ion battery direct current internal resistance testing method and battery screening method
Zhang Zhixian,Yin Yuxin,Men Peng +2 more
TL;DR: In this article, Li ion battery direct current internal resistance testing method is presented. But the method is not suitable for the case of battery screening, and the battery screening method disclosed by the invention can conveniently and rapidly detect the direct-current internal resistance of the battery, thus being beneficial to improvement of the detection efficiency and reducing the detection cost.
Patent
Method of determining deteriorated condition of storage battery and method of charging it
TL;DR: In this paper, a charging method to control the closed circuit voltage (OCV) of the storage battery and a charged condition (SOC) under 100% was proposed, and a deteriorated condition was determined from ΔIR (ΔIR = the second IR - the first IR) by integrating charging and discharging current values.
Patent
Test method for single body cell DC internal resistance
TL;DR: In this paper, a test method for single body cell DC internal resistance is presented, which consists of the following steps: an SOC value of charge and discharge is arranged to be 50%, ambient temperature of a cell box is adjusted, an electric core is charged with 0.3C rate constant current, and charging is cut-off when voltage upper limit is reached and then the electric core stands for 1 hour; the ambient temperature, the cell box was maintained, the electric cores discharges with a 0.5C rate, change of numerical values of voltage is recorded by a