Smart battery algorithm for reporting battery parameters to an external device

A battery is charged by repeatedly alternating between test and charge cycles During the test cycle, the dynamic voltage-current characteristic of the battery is obtained as a function of the charge condition of the battery During the charge cycle, a gradually varying voltage is supplied to the battery, substantially without controlling the current supplied thereto, for a predetermined time The rate at which this supplied voltage varies is related to the dynamic voltage-current characteristic obtained during the test cycle Alternating between test and charge cycles continues until the dynamic voltage-current characteristic last obtained is substantially identical to the preceding dynamic voltage-current characteristic, whereupon the charging of the battery is terminated

Method and apparatus for charging a battery

A device for determining the charge condition of a battery (10) comprises a current-frequency converter (50) which generates pulses of a frequency is dependent on the battery charge or discharge current. These pulses are counted and are used for computing the battery charge condition. In order to indicate a correct relative charge condition, especially in the case of a battery capacity which has changed due to, for example, ageing, the device comprises detection means (53) which detects an actual battery charge condition and correction means (52) for correcting the charge condition computed by a computing means (51). In one embodiment the correction means are integrated with the current-frequency converter and the frequency of the generated pulses is adapted to the present capacity of the battery.

Device for determining the charge condition of a battery

A method of and an apparatus for monitoring the state of charge of a rechargeable battery are disclosed which use a reference value corresponding to a defined state of charge stored in a memory. During each battery charging and discharging cycle, the terminal voltage, the current and time are measured and are converted into energy delivered to the battery or by the battery depending on the direction of current flow. The actual state of charge is then calculated from the reference value stored. The characteristic terminal voltage curve during charging and discharging is used for minimizing the differences between the quantities measured and the actual state of charge of the battery so monitored by monitoring the rate of change in the terminal voltage during the charging and the discharging cycles, by determining, after a phase of a relatively steady and small rate of change in voltage, at least one point at which the rate of change in voltage is higher and by adjusting the actual state of charge determined at this point by coulometry to the predetermined reference value.

Method of and apparatus for monitoring the state of charge of a rechargeable battery

Hearing aids include rechargeable batteries and contacts accessible from outside of the hearing aid casing for the battery. A charging case includes solar cells mounted on the charging case for outputting energy for charging the batteries in the hearing aids. The charging case may include silos for supporting an over-the-ear hearing aid or a recess for receiving a volume control on the hearing aid.

Solar powered hearing aid

Monitoring the state of charge consists of providing a magnitude g (e.g. a frequency F1) which is proportional to the storage battery charging or discharge current I (sensed at 2) and of algebraically integrating said magnitude (e.g. in an up/down counter K4, K5) into data which is the image of the state of charge of the storage battery; the proportionality constant a=g/I between said magnitude and said current being given a lower value during charging than during discharging, and the value of the constant a being varied during charging as an increasing function of the current I.

Method and device for monitoring the state of charge of a storage battery

L'invention concerne la charge des accumulateurs. Le suivi de l'etat de charge consiste a elaborer une grandeur g proportionnelle au courant I de charge ou de decharge de l'accumulateur, a integrer algebriquement ladite grandeur en une information qui est l'image de l'etat de charge de l'accumulateur, en donnant au coefficient de proportionnalite a = g/l entre ladite grandeur et ledit courant une valeur plus faible en charge qu'en decharge, et a faire varier la valeur du coefficient a en charge en fonction croissante du courant 1. Application aux accumulateurs.

Method and device to watch the charged state of an accumulator

L'invention concerne la charge des accumulateurs Le suivi de l'etat de charge consiste a elaborer une grandeur g proportionnelle au courant I de charge ou de decharge de l'accumulateur, a integrer algebriquement ladite grandeur en une information qui est l'image de l'etat de charge de l'accumulateur, en donnant au coefficient de proportionnalite a = g/l entre ladite grandeur et ledit courant une valeur plus faible en charge qu'en decharge, et a faire varier la valeur du coefficient a en charge en fonction croissante du courant 1 Application aux accumulateurs

Pierre Belot

Papers

Method and device for monitoring the state of charge of a storage battery

Method and device to watch the charged state of an accumulator

Procédé et dispositif de suivi de l'état de charge d'un accumulateur