System and method for battery charging
First Claim
Patent Images
1. A method for charging deep cycle lead acid batteries comprising:
- applying charging energy to such a battery;
identifying a 98% charge point in the charging process;
monitoring the charging energy provided in amp hours;
determining the remaining charging energy to be applied to fully charge the battery and to overcharge the battery by an amount substantially equal to a predetermined percentage of the quantity of energy applied to the battery from the commencement of charging to a point of full charge of the battery; and
applying the remaining charging energy to the battery.
9 Assignments
0 Petitions
Accused Products
Abstract
A method for charging a lead acid storage battery to advantageously extend its life is described. The termination of a charging process is based upon an evaluation of the first derivative (dv/dt) and second derivative (d2v/dt2) of the applied charging voltage. By utilizing the first derivative (dv/dt) and second derivative (d2v/dt2) as charging criteria, an amount of overcharge is applied to the battery that takes into account the precise amount of amp-hours previously removed from the battery. A charger arrangement for performing a charging process of the invention also is described.
-
Citations
11 Claims
-
1. A method for charging deep cycle lead acid batteries comprising:
-
applying charging energy to such a battery;
identifying a 98% charge point in the charging process;
monitoring the charging energy provided in amp hours;
determining the remaining charging energy to be applied to fully charge the battery and to overcharge the battery by an amount substantially equal to a predetermined percentage of the quantity of energy applied to the battery from the commencement of charging to a point of full charge of the battery; and
applying the remaining charging energy to the battery. - View Dependent Claims (2, 3)
-
-
4. A method for charging flooded deep cycle lead acid batteries comprising the steps of applying charging energy to such a battery according to a selected charging profile;
- identifying the point in the process at which the battery state has a known relation to a state of full charge of the battery and determining a first amount of charging energy delivered to the battery from the inception of the process to that point;
determining a second amount of further charging energy, adequate when applied to the battery to cause the battery to be overcharged by a selected amount related to the first amount; and
applying the second amount of charging energy to the battery.
- identifying the point in the process at which the battery state has a known relation to a state of full charge of the battery and determining a first amount of charging energy delivered to the battery from the inception of the process to that point;
-
5. A method for charging flooded deep cycle lead acid batteries comprising the steps of:
-
applying charging energy to such a battery;
monitoring the charging energy as to quantity delivered to the battery and its dv/dt and d2v/dt2 aspects;
by use of information about the amount of charging energy delivered to the battery at a point in the process when dv/dt is a maximum and d2v/dt2=0, determining and delivering to the battery beyond that point a defined quantity of charging energy additive to said amount adequate to overcharge the battery to a predetermined extent related to said amount.
-
-
6. A method for charging flooded deep cycle lead acid batteries comprising the steps of:
-
applying to such a battery an amount of charging energy equal to the initial charge deficiency of the battery, and applying to the battery a further increment of charging determined from information developed from the battery during performance of the method, adequate to overcharge the battery to an extent predetermined as a selected percentage of the charge deficiency.
-
-
7. A battery charging apparatus for charging deep cycle lead acid batteries comprising:
-
a DC current source;
a device operative to quantify the amount of charging energy delivered to a battery from the beginning of a pertinent battery recharge event;
a dv/dt measurement circuit; and
a d2v/dt2 measurement circuit - View Dependent Claims (8, 9, 10)
-
-
11. An apparatus for charging deep cycle lead acid batteries, the improvement comprising the combination which includes a voltage measurement device, a current measurement device, a timer, and a mechanism operative for determining when a battery being charged by the apparatus is at that point in a charging event at which the battery has a predetermined state of charge at or less than full charge and for determining and controlling the application to the battery beyond that point of a quantity of charging energy effective to overcharge the battery by a selected percentage of the amount of charging energy delivered to the battery to that point in that charging event.
Specification