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Energy Storage: Multi-battery Charge Equalization Circuits
Search All Applications in Energy Storage: Multi-battery Charge Equalization Circuits
Application US20190181656
Published 2019-06-13
Multi-cell Battery Management Device
Multi-cell battery management devices, systems, and method of operation are disclosed herein. A multi-cell battery pack includes a power output terminal and a plurality of battery cells each having a positive terminal and a negative terminal connected in series. Each cell of the plurality of battery cells includes: i) a cell control processor to monitor cell voltage, cell current, cell temperature, and cell fuse status; ii) a programmable cell balance shunt controlled by the cell control processor that varies the internal resistance of each cell of the plurality of battery cells; and iii) a data communications circuit connected to the cell control processor and to the positive terminal and the negative terminal of each cell, the communications circuit enabling data communications over the positive terminal and the negative terminal of each cell, and wherein the cell control processor responds to commands received via the data communications circuit to vary an operating state of the programmable cell balance shunt.
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- 1. A multi-cell battery management device, the device comprising:
a multi-cell battery pack including a power output terminal and a plurality of battery cells each having a positive terminal and a negative terminal and connected in series, and wherein each cell of the plurality of battery cells comprises:
a) a cell control processor that monitors cell voltage, cell current, cell temperature, and cell fuse status;
b) a programmable cell balance shunt controlled by the cell control processor that varies internal resistance of each of the plurality of battery cells; and
c) a data communications circuit connected to the cell control processor and to the positive terminal and the negative terminal of each of the plurality of battery cells, the communications circuit enabling data communications over the positive terminal and the negative terminal of each of the plurality of battery cells, and wherein the cell control processor responds to commands received via the data communications circuit to vary an operating state of the programmable cell balance shunt.
- 12. A method of achieving voltage balancing within a multi-cell battery pack, wherein the multi-cell battery pack has a battery management system (BMS) controller comprising a data communications circuit connected to a power output terminal of the multi-cell battery pack, and wherein the BMS controller performs the following steps:
i) obtaining cell voltage, cell current, cell temperature and cell fuse status data for each of a plurality of battery cells by transmitting and receiving via the data communications circuit, ii) determining desired cell output voltages based on the cell voltage, cell current, cell temperature and cell fuse status for each of the plurality of battery cells, iii) transmitting desired cell output voltage data to the data communications circuit of each of the plurality of battery cells using the data communications circuit of the BMS controller.
