A method for controlling a cell current limiting value for a battery management system. In some examples, the method includes determining quadratic reference currents of a battery cell; calculating a corresponding reference time constant for each reference current using a model for the calculation of a RMS value of a cell current by reference to a continuous current; constituting a diagram for the relationship between the reference time constant and the quadratic reference current; determining a predictive time constant by the comparison of a quadratic measured value of a cell current with the quadratic reference currents; calculating a predictive RMS limiting value of the cell current; calculating a first predictive limiting value for a short predictive time, a second predictive limiting value for a long predictive time, and a third predictive limiting value for a continuous predictive time; and calculating additional RMS limiting value for the cell current.

Methods and electronic devices for estimating state of charge (SOC) of a battery pack. Various embodiments provide a model comprising an (electrical) equivalent circuit model, an electrochemical (thermal) model, and a (convective) thermal model. The model estimates parameters pertaining to each cell of the battery pack individually, and determines the variations in the values of the parameters among each of the cells of the battery pack. The parameters include capacity, temperature current, voltage, and SOC. The parameters are computed based on at current drawn by the battery pack, electrochemical parameters, thermal parameters, and cell internal and connection resistances of the individual cells. Various embodiments compute battery pack uptime, chargeable capacity of the battery pack and SOC of the battery pack, based on the values of the parameters.

A method for charging a cell of an electric energy store includes setting the cell into a charging mode; determining a first and a second impedance characteristic, each representative of a complex alternating current impedance of the cell; determining a first and a second temperature characteristic on the basis of the impedance characteristics, each representative of a temperature of the cell; determining a deviation in the temperature characteristics; and reducing a charging current of the cell in the event that the deviation exceeds a specified temperature threshold value.

A lithium battery system comprising a battery and a feedback current control apparatus having a first current capture device that comprises: a first feedback current capture module for capturing feedback current; a first switch module for conducting or unidirectionally cutting off a main circuit; and a control module for receiving a first voltage of one end of a driver on the main circuit, a second voltage of one end of the battery, and the temperature of the battery. When a difference between the first and second voltage is greater than a preset voltage and the temperature of the battery is less than or equal to a preset temperature, the first switch module is controlled to unidirectionally cut off the main circuit to capture feedback current by the first feedback current capture module on a first current capture circuit, greatly reducing the probability of lithium precipitation and risk of thermal runaway.

The present application provide a control method of a power battery heating system. The method includes: controlling all upper bridge arms of a first bridge arm group and all lower bridge arms of a second bridge arm group to be turned on, and all lower bridge arms of the first bridge arm group and all upper bridge arms of the second bridge arm group to be turned off, so as to form a first loop; controlling all the lower bridge arms of the first bridge arm group and all the upper bridge arms of the second bridge arm group to be turned on, and all the upper bridge arms of the first bridge arm group and all the lower bridge arms of the second bridge arm group to be turned off, so as to form a second loop. The method is used to heat the power battery.

A method and apparatus (100) are provided for charging a vehicle battery (108). The apparatus (100) includes a controller (102) designed to influence a charging process of the vehicle battery (108). The apparatus (100) further has a switching device (104) to transmit a signal to the controller (102) in response to operation of the switching device (104) by a user. The controller (102) is designed to influence the vehicle battery (108) before the charging process in response to receiving the signal depending on at least one desired state for the charging process.

A method includes detecting a present temperature value of a battery cell of a battery, determining whether the present temperature value is higher than a lowest threshold temperature value and lower than a highest threshold temperature value, detecting a present electric current value of the battery in association with a determination that the present temperature value is higher than the lowest threshold temperature value and lower than the highest threshold temperature value, determining whether the present electric current value is higher than a threshold current value corresponding to the present temperature value, and stopping a charge-discharge process of the battery cell in response to determining that the present electric current value is higher than the threshold current value.

In a case where an external charging start time is set in an external charging timer when a charging plug is connected to a charging connector, a charging controller is configured to perform standby setting of external charging before the external charging start time and transits to a pause state. The charging controller is intermittently activated during a timer charging setting period from a pause period start time when transition is made to the pause state to the external charging start time, and when a battery temperature at the time of activation of the charging controller is equal to or lower than a predetermined temperature, execute a temperature increase mode in which a heater is operated to increase the temperature of a main battery.

A battery with at least two battery cells, which are connected by at least one electric connection element to one another, and a superordinate control device. Each of the battery cells is provided with at least one galvanic element, a battery cell housing for accommodating the galvanic element, at least one sensor device for detecting a physical and/or chemical feature of the battery cell, and a communication device for communicating with the superordinate device. The superordinate device is adapted to control an energy flow in at least one of the battery cells and/or from at least one of the battery cells as a function of the physical and/or chemical features of the battery cell. The invention further also relates to a motor vehicle with such a battery.

A method for determining a reference energy profile has comparing a first course and a second course. The first course describes an energy absorption of a first battery during a first charge cycle. The second course describes the energy absorption of the first or a second battery during a second charge cycle which follows after the first charge cycle. The comparison is performed for a plurality of time intervals. The method has determining a deviation between the first and the second course for each of the plurality of time intervals. In addition, the method has determining an amount of electrical energy based on the deviation for each of the time intervals, wherein the amount of electrical energy describes a preset default value of the reference energy profile for an amount of energy to be fed to a battery to be formed during a formation process of the battery to be formed for each of the time intervals.