The invention discloses a parameter acquisition of a liquid metal battery double equivalent circuit model and a switching method, and belongs to the field of liquid metal battery application. The parameter acquisition method comprises the following steps: carrying out a charge-discharge cycle test and a constant-current pulse test on a liquid metal battery; obtaining an open-circuit voltage by using a standing method; calculating the DC internal resistance of a charging and discharging direction Rint model according to the ohm law; calculating an impedance parameter of a Thevenin model; and dividing parameters of a double equivalent circuit models into four types according to the operation conditions. Therefore, a problem that a single equivalent circuit model cannot comprehensively represent the multi-time-scale dynamic characteristics of the liquid metal battery is solved. Besides, the switching method comprises the following steps: keeping or switching parameters of a double equivalent circuit model according to currents input into a battery at the moment t and the moment (t-1), and further calculating the output voltage of the double equivalent circuit model at the moment t. The parameter switching method can be quickly switched to a corresponding model parameter library according to the change of the working condition of the battery, and is easier in practical application.

Parameter acquisition of liquid metal battery double equivalent circuit model and switching method

The invention discloses a lithium battery aging tool and a detection method thereof. The lithium battery aging tool comprises an aging tool outer shell, wherein a communication indicating lamp, a keyI, a key II, a key III and a display screen are fixedly embedded in the outer surface of the aging tool outer shell; an aging equipment connecting module, a discharging module, a charging module, a communication module, a display module and a display screen are embedded and fixed in the interior of the aging tool outer shell; the aging tool outer shell is provided with a charger; the key I, the key II and the key III are electrically connected with a key module by means of lead wires; and the display module is electrically connected with the display screen by means of a lead wire. The single boards of the lithium battery aging tool can be used offline, charging and discharging curves of batteries can be calculated according to voltage, current and discharging time values of different batteries, the capacity of the batteries is calculated according to an ampere method, each single board can serve as an independent channel, the plurality of single boards are connected with one another and further connected in parallel with a computer to form a brand-new multi-channel aging system. The aging tool has the advantages of independence and groupness.

Lithium battery aging tool and detection method thereof

The embodiment of the invention discloses a calibration method for durability of a battery cell. The method comprises the steps of obtaining an influence factor set composed of at least two factors influencing the durability of the battery cell; testing the durability of the battery cell based on the influence factor set to obtain a test result; and analyzing the test result, and determining a calibration result of the battery cell, wherein the calibration result is used for representing a numerical value which reflects the durability of the battery cell after the battery cell is jointly influenced by each factor in the influence factor set. Therefore, the factors influencing the durability of the battery cell in multiple aspects can be comprehensively considered; the durability of the battery cell is tested in combination with the factors in multiple aspects; a perfect and accurate calibration value is obtained; the problem that the durability condition of the battery cell really needed by the user cannot be accurately reflected to the user when a certain factor is used as a single variable for testing and calibration is solved, so that the calibration of the durability of the battery cell when the BEV leaves the factory can accurately reflect the information really needed by the user, and the experience of the user on the battery on the BEV is improved.

Calibration method and device for durability of battery cell

The invention discloses a battery accelerated life test method. On the basis of dynamic feature test and temperature feature test of a battery, the environmental temperature, charging current, discharging current and the like are selected as acceleration stresses, and the battery is subjected to life test under different acceleration stresses respectively in order to obtain a certain quantity and quality of battery experiment data. Basic data are provided for the parameter recognition and state estimation of a battery model.

Battery accelerated life test method

The invention discloses a method, a system and a device for estimating the residual charge of lithium battery. The method includes the steps that: the charge and discharge operations of the lithium battery are carried out in the way of a small rate and in the way of a common charge and discharge rate respectively, and the mapping relationship among the total resistance, residual charge and currentof lithium battery is analyzed according to the results of charge and discharge. The current operating condition type is judged to be dynamic or steady state based on the current sequence of lithiumbattery, and the corresponding model and state equation of lithium battery are selected according to the current operating condition type. The state equation of lithium battery is calculated accordingto the mapping relationship. Based on the state equation of lithium battery under the current operating condition, with the current of lithium battery as input variable and the voltage of lithium battery as output variable, the residual charge of lithium battery is identified on-line by using the unscented Kalman filter algorithm. The method, system and device provided by the invention are suitable for both dynamic and steady state operating conditions, so as to ensure the accuracy of estimating the residual charge of lithium battery.

Method, system and device for estimating remaining power of lithium battery

The invention discloses a battery charging current selection method. According to performance test experimental data of a power battery system, a relational database including the charging multiplyingpower efficiency, the charging electrical-charge efficiency, the charging energy efficiency, the charging time efficiency and a charging current is established, then charging multiplying power optimization is conducted through a main component analysis method, and finally, the charging decision-making choice is optimized according to the battery charging multi-state constraint conditions. According to the method, the purpose of fast, safe and efficient charging can be achieved.

Battery charging current selection method

A parameter identification method based on a linear time-invariant battery model structure firstly obtains the parameter identification test of a design model through the target and prior knowledge, determines the structure of a battery model, identifies parameters of the battery model, and finally verifies the battery model.

Parameter identification method based on linear time-invariant battery model structure

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Battery accelerated life test method

Method, system and device for estimating remaining power of lithium battery

Battery charging current selection method

Parameter identification method based on linear time-invariant battery model structure