A battery temperature estimation method includes fitting, when a battery is in an offline state, a first function relationship according to corresponding admittances of the battery at different test temperatures, and obtaining a temperature distribution model of the battery according to the shape and the size of the battery, and determining a second function relationship corresponding to internal temperatures and a surface temperature by combining with the first function relationship. The second function relationship is used for estimating the internal temperature of the battery by using the surface temperature and the admittances of the battery.

A battery temperature estimation method includes fitting, when a battery is in an offline state, a first function relationship according to corresponding admittances of the battery at different test temperatures, and obtaining a temperature distribution model of the battery according to the shape and the size of the battery, and determining a second function relationship corresponding to internal temperatures and a surface temperature by combining with the first function relationship. The second function relationship is used for estimating the internal temperature of the battery by using the surface temperature and the admittances of the battery.

A state of health of cell groups of a battery may be determined based on direct current impedance values of the cell groups. A computing apparatus may be configured to determine a direct current internal resistance (DCIR) value of each of the cell groups of the battery pack to provide a plurality of DCIR values. Each cell group may include a plurality of battery cells. The computing apparatus may be configured to determine an average DCIR value based on the plurality of DCIR values and determine a relative DCIR threshold for at least one of the plurality of cell groups based on the average DCIR value. The computing apparatus may further be configured to provide an alert to a user in response to the DCIR value of the at least one of the plurality of cell groups exceeding the relative DCIR threshold.

A state of health of cell groups of a battery may be determined based on direct current impedance values of the cell groups. A computing apparatus may be configured to determine a direct current internal resistance (DCIR) value of each of the cell groups of the battery pack to provide a plurality of DCIR values. Each cell group may include a plurality of battery cells. The computing apparatus may be configured to determine an average DCIR value based on the plurality of DCIR values and determine a relative DCIR threshold for at least one of the plurality of cell groups based on the average DCIR value. The computing apparatus may further be configured to provide an alert to a user in response to the DCIR value of the at least one of the plurality of cell groups exceeding the relative DCIR threshold.

In an electric battery assembly plant, including a battery assembly line having a station that receives battery cells or modules to be assembled together, a measuring apparatus is configured for measuring the electrical resistance and the electrical voltage of a single battery cell or a battery module. The correct operation of the measuring apparatus is verified by arranging at least one dummy battery cell configured and sized to emulate a real battery cell, and having an electrical resistance of a predetermined value and/or including a voltage generator to generate a voltage of a strictly predetermined value at the terminals of the dummy battery cell. The dummy battery cell may then be used as a gauge to check in a simple and rapid way whether the measuring apparatus is operating correctly and reliably.

In an electric battery assembly plant, including a battery assembly line having a station that receives battery cells or modules to be assembled together, a measuring apparatus is configured for measuring the electrical resistance and the electrical voltage of a single battery cell or a battery module. The correct operation of the measuring apparatus is verified by arranging at least one dummy battery cell configured and sized to emulate a real battery cell, and having an electrical resistance of a predetermined value and/or including a voltage generator to generate a voltage of a strictly predetermined value at the terminals of the dummy battery cell. The dummy battery cell may then be used as a gauge to check in a simple and rapid way whether the measuring apparatus is operating correctly and reliably.

The present invention relates to a method for reconditioning of a battery module (1). The battery module (1) comprises two or more battery cells (2), and has a casing (4) encompassing the battery cells and enclosing a common gas space (5). The method comprises the steps of: obtaining data relating to the number of cells of the battery module and voltage over the battery cells; obtaining (102) an indicative parameter related to an internal resistance (Ri) of at least one of the battery cells; determining (104) based on the indicative parameter and the data on the battery module, determining (105a) whether the voltage indication over the at least one of the battery cells is range of voltage indication threshold (Ut0-Ut1), a filling amount of oxygen to be filled into the battery module; and filling (107) the amount of oxygen into the battery module in order to reduce the indicative parameter to a level below the first threshold value.

The present invention relates to a method for reconditioning of a battery module (1). The battery module (1) comprises two or more battery cells (2), and has a casing (4) encompassing the battery cells and enclosing a common gas space (5). The method comprises the steps of: obtaining data relating to the number of cells of the battery module and voltage over the battery cells; obtaining (102) an indicative parameter related to an internal resistance (Ri) of at least one of the battery cells; determining (104) based on the indicative parameter and the data on the battery module, determining (105a) whether the voltage indication over the at least one of the battery cells is range of voltage indication threshold (Ut0-Ut1), a filling amount of oxygen to be filled into the battery module; and filling (107) the amount of oxygen into the battery module in order to reduce the indicative parameter to a level below the first threshold value.

A method for determining an electric energy storage system state-of-power value. The method includes for each battery unit in the electric energy storage system, determining the battery unit state-of-power value, the battery unit state-of-power value being indicative of the maximum amount of electric load that the battery unit can deliver or receive at a constant load level during the predetermined future time range without violating electro-thermal limits of the battery unit, for each battery unit in the electric energy storage system, obtaining a battery unit measured load value indicative of the electric load actually imparted on the battery unit at a certain time instant, on the basis of the battery unit measured load value for each battery unit in the electric energy storage system, determining a load distribution amongst the battery units of the electric energy storage system, and determining the electric energy storage system state-of-power value on the basis of the battery unit state-of-power values and on the load distribution.

The invention relates to a method for determining the value of one or more parameters relating to the state of health of at least one accumulator of a battery that is intended to provide electrical energy to an external application. A first state-of-health parameter related to the resistance of at least one electrochemical element of the battery is determined according to the method comprising:—a step (1) of determining the value of the state of charge of the electrochemica 1 element, expressed as a percentage of a maximum state of charge; —a step (2) of verifying whether the determined value of the state of charge belongs to a sought range; —a step of repeating, as long as the result of the verification step (2) is not positive, the determination step (1) and then the verification step (2); —calculating the value of the first parameter as a function of at least the value of the state of charge determined during the last determination step (1).