Smart battery

• US 5,747,189 A
• Filed: 07/22/1992
• Issued: 05/05/1998
• Est. Priority Date: 07/22/1992
• Status: Expired due to Term

• Current Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Original Assignee: Valence Technology Incorporated (Lithium Werks B.V.)
• Inventors: Perkins, Bradley Alan
• Primary Examiner(s): BARTS, SAMUEL A
• Application Number:
  US07/918,435
• Time in Patent Office: 2,113 Days
• Field of Search: 320/39, 320/48, 429/7, 429/61, 429/91, 429/92
• US Class Current: 429/91
• CPC Class Codes: G01R 31/3004 Current or voltage test
• CPC Class Codes: H02J 7/0024 Parallel/serial switching of connection of batteries to charge or load circuit

Abstract

A battery and circuitry for monitoring state of charge of the battery are housed in a single housing. A display may be provided for displaying an indication of the state of charge, and a communication circuit may be provided for communicating electrical signals representing the state of charge to the exterior of the housing. Preferably, the battery module additionally includes a switch device for connecting the battery to terminals external to the housing and control circuitry responsive to the monitoring circuitry for causing the battery to be connected to and disconnected from the terminals. The control circuitry operates in accordance with thresholds to prevent deep discharge and overcharge.

Claims

1. A configurable battery comprising:

a plurality of battery cells;

means for switchably connecting said plurality of battery cells in series according to one switching condition and in parallel according to another switching condition;

a microprocessor powered by at least one of said battery cells, responsive to electrical signals for causing said one switching condition and for causing said another switching condition;

a unitary housing inside of which said battery cells, said means for switchably connecting, and said control means are all disposed; and

means for communicating electrical signals representing a desired voltage from an exterior of said housing to said microprocessor.

2. The apparatus of claim 1 further comprising display means visibly mounted on said exterior of said housing and responsive to said microprocessor for displaying a nominal voltage of said battery cells as connected.

3. An apparatus comprising:

a battery;

means for storing a multiplicity of data points representing one of an expected charging characteristic and an expected discharging characteristic of said battery;

means for monitoring a state of charge said battery and producing an indication of said state of charge;

means for comparing over time said indication of the state of charge of the battery with ones of said multiplicity of data points; and

housing means for housing said battery, said means for storing, said means for monitoring and said means for comparing.

4. The apparatus of claim 3 further comprising:

means for switchably connecting said battery to terminals external to said housing means; and

control means responsive to said means for comparing for causing said battery to be disconnected from said terminals.

5. The apparatus of claim 3 further comprising:

means responsive to said means for comparing for producing a digital signal indicative of an abnormal condition; and

means for communicating said digital signal to an exterior of said housing means.

6. An apparatus comprising:

a battery;

means for storing a multiplicity of data points representing an expected state of charge of said battery over a multiplicity of charging cycles;

means for monitoring a state of charge of said battery and producing an indication of said state of charge of;

means for comparing over multiple cycles said indication of the state of charge of the battery with ones of said multiplicity of data points; and

housing means for housing said battery, said means for storing, said means for monitoring and said means for comparing.

7. The apparatus of claim 6 further comprising:

means for switchably connecting said battery to terminals external to said housing means; and

control means responsive to said means for comparing for causing said battery to be disconnected from said terminals.

8. The apparatus of claim 6 further comprising:

means responsive to said means for comparing for producing a digital signal indicative of an abnormal condition; and

means for communicating said digital signal to an exterior of said housing means.