US 11,777,329 B2
Method for controlling a charging or discharging current of a removable battery pack and/or an electrical device and system for carrying out the method
Alexander Osswald, Stuttgart (DE); Christoph Klee, Stuttgart (DE); Holger Wernerus, Pliezhausen (DE); Juergen Mack, Goeppingen (DE); Marc-Alexandre Seibert, Stuttgart (DE); Mickael Segret, Stuttgart (DE); and Tim Brecht, Karlsbad (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Jul. 19, 2021, as Appl. No. 17/379,454.
Claims priority of application No. 10 2020 209 400.4 (DE), filed on Jul. 24, 2020.
Prior Publication US 2022/0029436 A1, Jan. 27, 2022
Int. Cl. H02J 7/00 (2006.01)
CPC H02J 7/0047 (2013.01) [H02J 7/0013 (2013.01); H02J 7/0029 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for controlling (i) a charging current supplied to a removable battery pack, or (ii) a discharging current from the removable battery pack using a first monitoring unit integrated in the removable battery pack, the method comprising:
monitoring a defined control potential of a signal or data contact between the removable battery pack and an electrical device using an evaluation unit of the electrical device, the removable battery pack operably connected to the electrical device;
changing the defined control potential using the first monitoring unit when the first monitoring unit has identified a fault state of the removable battery pack;
signaling the identified fault state by changing a display of the removable battery pack;
forming the defined control potential from (i) at least one first resistor in the removable battery pack at a first reference potential, and (ii) at least one further resistor in the electrical device at a second reference potential different from the first reference potential, wherein changing the defined control potential comprises changing the defined control potential in the removable battery pack in a direction of the second reference potential by bypassing the at least one first resistor when the first monitoring unit has identified the fault state of the removable battery pack;
setting an output signal of the evaluation unit to a LOW level when the defined control potential has changed in the direction of the second reference potential;
supplying the output signal of the evaluation unit and an output signal of a second monitoring unit of the electrical device to a logic link element, wherein an output of the logic link element is a control signal for a switching element;
using the switching element to interrupt or establish the charging current or the discharging current based on the output of the logic link element;
connecting the output signal of the evaluation unit to the second monitoring unit with a first filter element;
connecting an input of the evaluation unit to the second monitoring unit with a second filter element, wherein the input of the evaluation unit is the defined control potential;
detecting the change in the defined control potential using the second monitoring unit; and
logging the identified fault state using the second monitoring unit.