US2019288320A1PendingUtilityA1
Flow battery system and large scale flow battery energy storage device
Est. expiryAug 17, 2036(~10.1 yrs left)· nominal 20-yr term from priority
H02M 7/49H01M 8/188H01M 8/18H01M 8/24H02M 3/33576H01M 8/04298H02J 7/56Y02E60/50
44
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Claims
Abstract
The present disclosure discloses a flow battery system and a large-scale flow battery energy storage device. The flow battery system comprises multiple flow batteries; each of the flow batteries comprises a battery pack A, a battery pack B, a battery pack C, and a set of electrolyte circulation system used by the battery pack A, the battery pack B and the battery pack C; the battery pack A, the battery pack B and the battery pack C comprised in each flow battery are independent of each other in the circuit. According to the present disclosure, at least two sets of electrolyte circulation system are saved under the same power scale, such that the system stability is improved while the cost is reduced.
Claims
exact text as granted — not AI-modified1 . A flow battery system, comprising:
multiple flow batteries, each of the flow batteries comprises a battery pack A, a battery pack B, a battery pack C, and a set of electrolyte circulation system shared by the battery pack A, the battery pack B and the battery pack C; the battery pack A, the battery pack B and the battery pack C comprised in each flow battery are independent of each other in a circuit.
2 . The flow battery system according to claim 1 , wherein the battery pack A, the battery pack B or the battery pack C comprises multiple cell stacks which are connected in series with each other in the circuit; the electrolyte circulation system at least comprises a positive storage tank, a negative storage tank and an electrolyte circulation pipeline.
3 . The flow battery system according to claim 1 , wherein the battery pack A, the battery pack B and the battery pack C are electrically isolated from each other and are equipotential.
4 . The flow battery system according to claim 1 , wherein the energy storage scale of the flow battery system is changed by increasing the quantity of the flow batteries.
5 . A large-scale energy flow battery storage device, comprising:
the flow battery system according to claim 1 ; and an energy storage converter provided with multiple power units, wherein the multiple power units are divided into three groups, i.e., a power unit group A, a power unit group B and a power unit group C; a cascaded AC side of the power unit group A is connected between an A phase line and a neutral line of a three-phase AC, and a DC side of the power unit group A is connected to the battery packs A comprised in the flow batteries respectively; a cascaded AC side of the power unit group B is connected between a B phase line and the neutral line of the three-phase AC, and a DC side of the power unit group B is connected to the battery packs B comprised in the flow batteries respectively; a cascaded AC side of the power unit group C is connected between a C phase line and the neutral line of the three-phase AC, and a DC side of the power unit group C is connected to the battery packs C comprised in the flow batteries respectively.
6 . The large-scale flow battery energy storage device according to claim 5 , wherein
a DC/DC isolated conversion module is respectively arranged between each power unit and each of the battery pack A, the battery pack B and the battery pack C; or the energy storage device further comprises a transformer A, a transformer B and a transformer C; two ends of a primary winding of the transformer A are connected to the A phase line and the neutral line of the three-phase AC respectively; the transformer A is connected to AC sides of the power units of the power unit group A respectively through a plurality of secondary windings; two ends of a primary winding of the transformer B are connected to the B phase line and the neutral line of the three-phase AC respectively; the transformer B is connected to AC sides of the power units of the power unit group B respectively through a plurality of secondary windings; two ends of a primary winding of the transformer C are connected to the C phase line and the neutral line of the three-phase AC respectively; the transformer C is connected to AC sides of the power units of the power unit group C respectively through a plurality of secondary windings.
7 . The large-scale flow battery energy storage device according to claim 5 , wherein the respective power units comprised in the power unit group A have the same input/output parameters; the respective power units comprised in the power unit group B have the same input/output parameters; the respective power units comprised in the power unit group C have the same input/output parameters; the power unit uses an H-bridge conversion circuit.
8 . The large-scale flow battery energy storage device according to claim 5 , wherein an SOC difference between the battery packs A of the respective flow battery systems is reduced by adjusting a voltage of the AC side of each power unit of the power unit group A; an SOC difference between the battery packs B of the respective flow battery systems is reduced by adjusting a voltage of the AC side of each power unit of the power unit group B; an SOC difference between the battery packs C of the respective flow battery systems is reduced by adjusting a voltage of the AC side of each power unit of the power unit group C.
9 . The large-scale flow battery energy storage device according to claim 8 , wherein
in a charging process, by adjusting a voltage of the AC side of each power unit of the power unit group A, the power absorbed by the battery pack whose SOC value meets a first preset condition is lower than the power adsorbed by the battery pack whose SOC value meets a second preset condition among multiple battery packs A; by adjusting a voltage of the AC side of each power unit of the power unit group B, the power absorbed by the battery pack whose SOC value meets the first preset condition is lower than the power adsorbed by the battery pack whose SOC value meets the second preset condition among multiple battery packs B; by adjusting a voltage of the AC side of each power unit of the power unit group C, the power absorbed by the battery pack whose SOC value meets the first preset condition is lower than the power adsorbed by the battery pack whose SOC value meets the second preset condition among multiple battery packs C; in a discharging process, by adjusting the voltage of the AC side of each power unit of the power unit group A, the power released by the battery pack whose SOC value meets the first preset condition is higher than the power released by the battery pack whose SOC value meets the second preset condition among multiple battery packs A; by adjusting a voltage of the AC side of each power unit of the power unit group B, the power released by the battery pack whose SOC value meets the first preset condition is higher than the power released by the battery pack whose SOC value meets the second preset condition among multiple battery packs B; by adjusting a voltage of the AC side of each power unit of the power unit group C, the power released by the battery pack whose SOC value meets the first preset condition is higher than the power released by the battery pack whose SOC value meets the second preset condition among multiple battery packs C.
10 . The large-scale flow battery energy storage device according to claim 9 , wherein the i th power unit in the power unit group A is modulated by modulating wave ΔV CAi =k 1 ·k 2 ·ΔSOC Ai ·V CA ; the i th power unit in the power unit group B is modulated by modulating wave ΔV CBi =k 1 ·k 2 ·ΔSOC Bi ·V CB ; the i th power unit in the power unit group C is modulated by modulating wave ΔV CCi =k 1 ·k 2 ΔSOC Ci ·V CC ;
wherein, ΔV CAi is the modulating wave for modulating the i th power unit in the power unit group A; ΔV CBi is the modulating wave for modulating the i th power unit in the power unit group B; ΔV CCi is the modulating wave for modulating the i th power unit in the power unit group C;
k
1
=
{
1
I
d
≥
0
-
1
I
d
<
0
;
k 2 =0-2; ΔSOC Ai =SOC A −SOC Ai , wherein SOC A is a SOC average value of the multiple battery packs A,
SOC
A
=
1
n
(
SOC
A
1
+
SOC
A
2
+
…
+
SOC
An
)
;
SOC Ai is a SOC value of the i th battery pack A; V CA is an A phase voltage; SOC B is a SOC average value of the multiple battery packs B,
SOC
B
=
1
n
(
SOC
B
1
+
SOC
B
2
+
…
+
SOC
Bn
)
;
SOC Bi is a SOC value of the i th battery pack B; V CB is a B phase voltage; SOC C is a SOC average value of the multiple battery packs C,
SOC
C
=
1
n
(
SOC
C
1
+
SOC
C
2
+
…
+
SOC
Cn
)
;
SOC Ci is a SOC value of the i th battery pack C; V CC is a C phase voltage; i=1, 2, . . . n; I d is a total current of the DC side of the energy storage converter.Join the waitlist — get patent alerts
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