Process for monitoring the residual charge and capacity of a battery
First Claim
1. A process for monitoring the residual charge and the capacity of a load-carrying battery in a battery system with a limiting voltage level (UGr) and a minimum current (Imin) where:
- at least at an initial time (T1), at least an initial voltage-current-measurement is carried out for an initial load condition of the battery and at least an initial measuring point (M1) is determined, at least at a second different time (T2), at least a second voltage-current measurement is carried out for a second load condition of the battery and at least a second measuring point (M2) is determined, the measuring points (M1 and M2) are always determined at a load condition of the battery that is greater than 30% of the nominal capacity per hour (KN/h), the measuring points (M1 and M2) set a mean curve (3), and the point of intersection (S3) of the mean curve with the limiting voltage level (UGr) is determined and the associated limiting current (IGr) is determined, and the differences between the limiting current (IGr) and the minimum current (Imin) determines a limiting current reserve as the dimension for the residual charge available in the battery.
2 Assignments
0 Petitions
Accused Products
Abstract
Process for monitoring the residual charge and the capacity of a battery, where at least two voltage-current measurements have been carried out on the load-carrying battery. The current load of the battery selected here should be greater than 30% of the nominal capacity per hour, e.g. for a 100 Ah battery, at least 30 amperes. The initial voltage-current measurement is taken at an initial time for an initial load condition of the battery. A second voltage-current measurement is carried out at a second time for a second load condition of the battery. It is essential here that the load condition of the battery has changed because of the current that has been drawn. The current-voltage measurements produce an initial measuring point and a second measuring point. The two measuring points set an interpolation line and determine the point of intersection with a limiting voltage level (UGr). This point of intersection is marked by a so-called limiting current (IGr). The limiting voltage level is decided from the minimum voltage required by the connected consumers in order for them to operate fault-free. The limiting voltage level is therefore stipulated for the technical layout of the battery system and is known. Furthermore, fault-free operation of the connected consumers requires a minimum operating current (Imin), which is also specified and known as a design parameter of the battery system. The difference between the determined limiting current IGr and the minimum operating current Imin is determined and recorded. This difference is a dimension for the residual charge of the battery that is still available and in accordance with the invention is here designated as the limiting current reserve.
19 Citations
14 Claims
-
1. A process for monitoring the residual charge and the capacity of a load-carrying battery in a battery system with a limiting voltage level (UGr) and a minimum current (Imin) where:
-
at least at an initial time (T1), at least an initial voltage-current-measurement is carried out for an initial load condition of the battery and at least an initial measuring point (M1) is determined, at least at a second different time (T2), at least a second voltage-current measurement is carried out for a second load condition of the battery and at least a second measuring point (M2) is determined, the measuring points (M1 and M2) are always determined at a load condition of the battery that is greater than 30% of the nominal capacity per hour (KN/h), the measuring points (M1 and M2) set a mean curve (3), and the point of intersection (S3) of the mean curve with the limiting voltage level (UGr) is determined and the associated limiting current (IGr) is determined, and the differences between the limiting current (IGr) and the minimum current (Imin) determines a limiting current reserve as the dimension for the residual charge available in the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification