Abstract: A method is described for charging an accumulator having terminals at which a terminal voltage is applied. The method includes the following steps: (a) charging the accumulator using a predefined current or a predefined electrical power until the terminal voltage has reached a predefined first value; (b) determining a time-dependent drop in the terminal voltage of the accumulator at a reduced charge current; (c) determining a second value on the basis of the voltage loss, the second value being greater than the first value; and (d) charging the accumulator using a predefined current or a predefined electrical power until the terminal voltage of the accumulator has reached the second value.

Abstract: A method is described for charging an accumulator having terminals at which a terminal voltage is applied. The method includes the following steps: (a) charging the accumulator using a predefined current or a predefined electrical power until the terminal voltage has reached a predefined first value; (b) determining a time-dependent drop in the terminal voltage of the accumulator at a reduced charge current; (c) determining a second value on the basis of the voltage loss, the second value being greater than the first value; and (d) charging the accumulator using a predefined current or a predefined electrical power until the terminal voltage of the accumulator has reached the second value.

Abstract: A battery device, in particular a battery device for a hand-held power tool, is provided which includes at least one highly functional energy storage unit.

Abstract: The subject matter of the present is a method for manufacturing an electrode for an electrochemical energy reservoir, in particular for a lithium-ion battery, encompassing the method steps of: a) furnishing a mixture of initial substances for formation of a lithium titanate; b) calcining the mixture of initial substances for formation of a lithium titanate; c) adding to the mixture of initial substances for formation of a lithium titanate, before and/or after calcination, a component encompassing sulfur and optionally lithium; and/or d) adding a pore former, before and/or after calcination, to the mixture of initial substances for formation of a lithium titanate; e) sintering the calcined product; and f) optionally removing the pore former from the calcined and optionally sintered product. Electrodes having a particularly defined pore structure can be generated with a method of this kind, thereby making possible particularly good capacity that is stable over the long term.

Abstract: A charging device for electrical charging of a battery pack of a hand-held power tool including a charging interface for establishing an electrical and/or mechanical coupling of the charging device to an interface unit of the battery pack, the charging interface having at least two counter-contact elements for electrical and/or mechanical contacting of corresponding contact elements of the battery pack. The counter-contact elements include a third counter-contact element designed to forward information transmitted by the third contact element with respect to a first set of predefined battery system parameters of the battery pack to the charging control unit, and a fourth counter-contact element designed to forward information transmitted by the fourth contact element with respect to an instantaneous operating parameter of the battery pack to the charging control unit.

Abstract: A system includes a rechargeable electrical energy store having a predetermined nominal capacity and a predetermined maximum capacity, the maximum capacity being higher than the nominal capacity, and a charging unit for controlling a charging process of the energy store. The charging unit is configured for the purpose of charging the energy store until the amount of energy stored in it equals the nominal capacity, and then to determine an end of charging.

Abstract: A rechargeable battery device, in particular to a handheld power tool rechargeable battery device, includes a housing, a mechanical interface unit to a detachable coupling to a handheld power tool, an electrical interface unit to a detachable coupling to the handheld power tool and at least one energy storage unit, which is situated inside the housing and which includes the at least one at least essentially cylindrical lithium-ion secondary cell. The at least one lithium-ion secondary cell has a maximum diameter which has a value from a value range between 19.5 mm and 22.5 mm.

Abstract: The subject matter of the present is a method for manufacturing an electrode for an electrochemical energy reservoir, in particular for a lithium-ion battery, encompassing the method steps of: a) furnishing a mixture of initial substances for formation of a lithium titanate; b) calcining the mixture of initial substances for formation of a lithium titanate; c) adding to the mixture of initial substances for formation of a lithium titanate, before and/or after calcination, a component encompassing sulfur and optionally lithium; and/or d) adding a pore former, before and/or after calcination, to the mixture of initial substances for formation of a lithium titanate; e) sintering the calcined product; and f) optionally removing the pore former from the calcined and optionally sintered product. Electrodes having a particularly defined pore structure can be generated with a method of this kind, thereby making possible particularly good capacity that is stable over the long term.

Abstract: A cathode for a lithium-sulphur cell includes a current collector. A cathode layer system is applied to the current collector in order to achieve a high energy density, current rate and cycle stability. This layer system includes at least one conductive layer and at least one layer that contains sulphur. The at least one conductive layer is in electrical contact with the current collector.