Methods and apparatuses for electrochemical cell monitoring and control
View Patent ↗Battery sub-arrays are configured for electrical and mechanical coupling with each other to form a multi-cell battery. A sub-array may be an individual cell or a group of cells. Each sub-array includes a bypass switch to connect the sub-array within the multi-cell battery or bypass the sub-array. Monitor and control circuitry controls the bypass switch in response to voltage measurements, temperature measurements or a combination thereof for the sub-array. Each sub-array is contained in a holder including a housing and a thermal container encompassing a substantial portion of the housing. The housing includes a cell cavity, a sensor cavity, and a circuit cavity. Positive terminals and negative terminals are positioned on sides of the holder such that when holders are mechanically abutted in an array, various electrical connections can be made to connect the cells in series, parallel, or a combination thereof.
1. A multi-cell battery, comprising:
two or more electrochemical cell circuits operably coupled to form the multi-cell battery, wherein each of the two or more electrochemical cell circuits comprises:
a single electrochemical cell;
a bypass switch operably coupled to switch a first holder terminal to either a second holder terminal or a cell terminal of the single electrochemical cell; and
monitor and control circuitry operably coupled to the single electrochemical cell and the bypass switch and configured for:
monitoring a voltage across the single electrochemical cell; and
selectively operating the bypass switch to connect or disconnect the cell terminal from the second holder terminal responsive to the monitoring.
2. The multi-cell battery of claim 1 , wherein each of the two or more electrochemical cell circuits further comprises a temperature sensor operably coupled to the monitor and control circuitry and configured for disposition in a holder for the single electrochemical cell and proximate the single electrochemical cell and wherein the monitor and control circuitry is further configured for:
sampling the temperature sensor to determine temperature information; and
selectively operating the bypass switch to connect or disconnect the cell terminal from the second holder terminal responsive to the temperature information.
3. The multi-cell battery of claim 1 , wherein the two or more electrochemical cell circuits are operably coupled in series.
4. The multi-cell battery of claim 1 , wherein the two or more electrochemical cell circuits are operably coupled in parallel.
5. The multi-cell battery of claim 1 , wherein the two or more electrochemical cell circuits comprise four or more electrochemical cell circuits and at least two of the four or more electrochemical cell circuits are operably coupled in parallel and at least two of the four or more electrochemical cell circuits are operably coupled in series.
6. The multi-cell battery of claim 1 , wherein the bypass switch in each of the two or more electrochemical cell circuits comprises a first transistor operably coupled between the cell terminal and the first holder terminal and a second transistor operably coupled between the first holder terminal and the second holder terminal, and each of the first transistor and the second transistor is controlled by a switch control signal from the monitor and control circuitry.
7. A multi-cell battery, comprising:
a first electrochemical cell circuit, comprising:
a first positive terminal;
a first negative terminal;
a first electrochemical cell including a first cell terminal;
a first bypass switch; and
first monitor and control circuitry operably configured to monitor a first voltage across the first electrochemical cell and to operate the first bypass switch responsive to the monitoring to couple the first positive terminal and the first negative terminal or couple the first cell terminal to one of the first positive terminal and the first negative terminal; and
a second electrochemical cell circuit, comprising:
a second positive terminal;
a second negative terminal;
a second electrochemical cell including a second cell terminal;
a second bypass switch; and
second monitor and control circuitry operably configured to monitor a second voltage across the first electrochemical cell and to operate the second bypass switch responsive to the monitoring to couple the second positive terminal and the second negative terminal or couple the second cell terminal to one of the second positive terminal and the second negative terminal;
wherein the first positive terminal is operably coupled to the second positive terminal and the first negative terminal is operably coupled to the second negative terminal.
8. The multi-cell battery of claim 7 , wherein:
the first electrochemical cell circuit further comprises a first temperature sensor disposed proximate the first electrochemical cell and operably coupled to the first monitor and control circuitry; and
the second electrochemical cell circuit further comprises a second temperature sensor disposed proximate the second electrochemical cell and operably coupled to the second monitor and control circuitry.
9. The multi-cell battery of claim 7 , wherein:
the first bypass switch comprises a first transistor operably coupled between the first cell terminal and the first positive terminal and a second transistor operably coupled between the first positive terminal and the first negative terminal; and
the second bypass switch comprises a third transistor operably coupled between the second cell terminal and the second positive terminal and a fourth transistor operably coupled between the second positive terminal and the second negative terminal.
10. A multi-cell battery, comprising:
a first electrochemical cell circuit, comprising:
a first positive terminal;
a first negative terminal;
a first electrochemical cell including a first cell terminal;
a first bypass switch; and
first monitor and control circuitry operably configured to monitor a first voltage across the first electrochemical cell and to operate the first bypass switch responsive to the monitoring to couple the first positive terminal and the first negative terminal or couple the first cell terminal to one of the first positive terminal and the first negative terminal; and
a second electrochemical cell circuit, comprising:
a second positive terminal;
a second negative terminal;
a second electrochemical cell including a second cell terminal;
a second bypass switch; and
second monitor and control circuitry operably configured to monitor a second voltage across the first electrochemical cell and to operate the second bypass switch responsive to the monitoring to couple the second positive terminal and the second negative terminal or couple the second cell terminal to one of the second positive terminal and the second negative terminal;
wherein the first positive terminal forms a positive battery terminal of the multi-cell battery, the second positive terminal is operably coupled to the first negative terminal, and the second negative terminal forms a negative battery terminal of the multi-cell battery.
11. The multi-cell battery of claim 10 , wherein:
the first electrochemical cell circuit further comprises a first temperature sensor disposed proximate the first electrochemical cell and operably coupled to the first monitor and control circuitry; and
the second electrochemical cell circuit further comprises a second temperature sensor disposed proximate the second electrochemical cell and operably coupled to the second monitor and control circuitry.
12. The multi-cell battery of claim 10 , wherein:
the first bypass switch comprises a first transistor operably coupled between the first cell terminal and the first positive terminal and a second transistor operably coupled between the first positive terminal and the first negative terminal; and
the second bypass switch comprises a third transistor operably coupled between the second cell terminal and the second positive terminal and a fourth transistor operably coupled between the second positive terminal and the second negative terminal.