Power supply and storage device
View Patent ↗A power supply and storage device comprises a direct current bus, a power conversion system electrically connected to the DC bus, and plural battery clusters connected in parallel. The power conversion system is electrically connected to a first power supply end and converts one of alternating current and direct current into another of the alternating current and the direct current. Each battery cluster includes plural battery modules connected in parallel. Each battery module includes plural cells connected in series. Each battery cluster includes a bidirectional isolated control module electrically connected to the DC bus. Each bidirectional isolated control module is electrically connected to the battery modules of a respective battery cluster and electrically isolates the DC bus from each battery module. A voltage value of the DC bus is decided by an operating power of the power conversion system and the number of the bidirectional isolated control modules in operation.
1 . A power supply and storage device comprising:
a directed current (DC) bus;
a power conversion system electrically connected to the DC bus, wherein the power conversion system is configured to be electrically connected to a first power supply end and to convert one of alternating current and direct current into another of the alternating current and the direct current; and
plural battery clusters connected in parallel, wherein each of the plural battery clusters includes plural battery modules connected in parallel, wherein each battery module includes plural cells connected in series, wherein each battery cluster further includes a bidirectional isolated control module electrically connected to the DC bus, wherein each bidirectional isolated control module is electrically connected to the battery modules of a respective one of the plural battery clusters and electrically isolates the DC bus from each battery module, wherein a voltage value of the DC bus is decided by an operating power of the power conversion system and a number of the bidirectional isolated control modules in operation, and wherein when each bidirectional isolated control modules control charging and discharging of the respective battery cluster according to the voltage value measured on the DC bus, the bidirectional isolated control modules are identical in a charging current value and a charging voltage value during charging and are identical in a discharging current value and a discharging voltage value during discharging.
2 . The power supply and storage device as claimed in claim 1 , wherein a voltage value of the DC bus in operation is between a first voltage value and a second voltage value greater than the first voltage value, wherein a stable voltage value of the DC bus is calculated by equation (1):
V sc =( P 1 /P 2 )*( V 2 −V c )+ V c (1)
wherein V sc is the stable voltage value of the DC bus during charging, V 2 is the second voltage value, V c is an initial charging voltage value, P 2 is the rated charging power of each bidirectional isolated control module, P 1 is a charging power of each bidirectional isolated control module and is equal to OP/N b , wherein OP is an operating power of the power conversion system, and N b is the number of the bidirectional isolated control modules in operation.
3 . The power supply and storage device as claimed in claim 2 , wherein when each battery module is discharging, the stable voltage value is calculated by equation (2):
V sd =V d −( P 3 /P 4 )*( V d −V 1 ) (2)
wherein V sd is a stable voltage value of the DC bus during discharging, V d is an initial discharging voltage value, P 4 is a rated discharging power of the bidirectional isolated control module, and V 1 is the first voltage value, P 3 is a practical discharging power of each bidirectional isolated control module and is equal to OP/N b , wherein OP is the operating power of power conversion system, and N b is the number of the bidirectional isolated control modules in operation.
4 . The power supply and storage device as claimed in claim 3 , wherein the charging current value of each battery module charged by the respective bidirectional isolated control module and the discharging current value of each battery module discharged by the respective bidirectional isolated control module are respectively calculated by equations (3) and (4):
I 1 =I 2 *( V b −V c )/( V 2 −V c ) (3)
I 3 =I 4 *( V a −V b )/( V d −V 1 ) (4)
wherein I 1 is the charging current value of each battery module charged by the respective bidirectional isolated control module, I 2 is a rated charging current of each battery module, V b is a measured real-time voltage value of the DC bus, V c is an initial charging voltage value, V 2 is the second voltage value, I 3 is the discharging current value, I 4 is a rated discharging current of each battery module, V d is the initial discharging voltage value, and V 1 is the first voltage value, and wherein the initial charging voltage value V c is greater than the initial discharging voltage value V d by a value in a range of 5-20V.
5 . The power supply and storage device as claimed in claim 1 , wherein a number of the plural cells connected in series is in a range of 20-30, and wherein a working voltage of each battery module is in a range of 40-60V.
6 . The power supply and storage device as claimed in claim 1 , wherein each battery module includes a battery management system electrically connected to each cell, wherein each battery management system controls a voltage value of each cell after charging to be within a range of allowable error which is ±0.01V-±0.1V.
7 . The power supply and storage device as claimed in claim 1 , wherein each battery module includes a battery management system electrically connected to each cell, wherein each battery management system monitors operational data of each cell including at least a real-time temperature of each cell, wherein when the real-time temperature of one of the plural cell is higher than a preset temperature, a respective one of the bidirectional isolated control modules associated with the one of the plural cells whose real-time temperature is higher than the preset temperature stops charging and/or discharging of a respective one of the plural battery modules associated with the one of the plural cells whose real-time temperature is higher than the preset temperature.
8 . The power supply and storage device as claimed in claim 1 , further comprising:
an energy management system electrically connected to the power conversion system and each bidirectional isolated control module, wherein when each battery cluster is charging, the energy management system controls the power conversion system to convert the alternating current supplied by the first power supply end into the direct current which is supplied to the DC bus, wherein each bidirectional isolated control module uses the direct current of the DC bus to charge the respective battery modules, wherein when each battery cluster is discharging, the respective bidirectional isolated control module uses electricity of the respective battery cluster to generate direct current at the DC bus, and wherein the power conversion system converts the direct current generated at the DC bus into alternating current to be used by at least one load; and
a battery cluster unit electrically connected between the energy management system and each battery cluster, wherein each battery module includes a battery management system electrically connected to each cell, wherein the battery management system of each battery module captures an operational data of each of the associated cells and sends the operational data to the battery cluster unit, wherein the battery cluster unit sends the operational data to the energy management system, wherein the operation data includes a real-time voltage value and a real-time temperature of each of the associated cells,
wherein when the energy management system detects that one of the plural cells has an abnormal real-time voltage value, a respective one of the bidirectional isolated control modules associated with the one of the plural cells having the abnormal temperature stops charging and/or discharging of the respective one of the battery modules associated with the one of the plural cells having the abnormal temperature.
9 . The power supply and storage device as claimed in claim 1 , further comprising a second power supply end comprised of at least one of a green energy system and a recycling power generating system, wherein the second power supply end is electrically connected to the DC bus and is configured to be electrically connected to at least one load, wherein the first power supply end supplies alternating current, wherein the power conversion system converts the alternating current of the first power supply end into direct current which is delivered to the DC bus, wherein each bidirectional isolated control module uses the direct current of the DC bus to charge each battery cluster, and wherein the power conversion system is capable of converting the direct current released from each battery cluster into alternating current to be supplied to the at least one load.
10 . The power supply and storage device as claimed in claim 1 , further comprising:
an energy management system electrically connected to the power conversion system and each bidirectional isolated control module, wherein when the energy management system controls the power conversion system to convert the alternating current supplied by the first power supply end into the direct current and delivers the direct current to the DC bus, each bidirectional isolated control module uses the direct current of the DC bus to charge the respective battery modules, wherein when the energy management system controls the power conversion system to supply electricity to at least one load, each bidirectional isolated control module uses the electricity of the respective battery cluster to generate direct current on the DC bus, and wherein the power conversion system converts the direct current generated on the DC bus into alternating current to be supplied to the at least one load; and
a battery cluster unit electrically connected between the energy management system and each battery cluster, wherein the battery cluster unit is configured to detect whether each battery cluster generates at least one of smoke, flammable gases, volatile organic compounds, carbon monoxide, and hydrogen, and wherein when presence of any one of the generates smoke, flammable gases, volatile organic compounds, carbon monoxide, and hydrogen is detected by the battery cluster unit, the energy management system stops operation of each bidirectional isolated control module, such that all battery modules stop charging and discharging.