CN117791827A - Battery pack parallel operation circuit and energy storage device - Google Patents
Battery pack parallel operation circuit and energy storage device Download PDFInfo
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- CN117791827A CN117791827A CN202410211736.7A CN202410211736A CN117791827A CN 117791827 A CN117791827 A CN 117791827A CN 202410211736 A CN202410211736 A CN 202410211736A CN 117791827 A CN117791827 A CN 117791827A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 118
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- 238000010438 heat treatment Methods 0.000 abstract description 4
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery pack parallel circuit which comprises a plurality of battery packs and a plurality of transmission circuits correspondingly arranged, wherein each transmission circuit is provided with a voltage conversion module, and the battery packs are respectively and electrically connected with a direct current bus through the corresponding voltage conversion modules; and when one transmission circuit is opened, the shunt switch is closed, the direct current output by the battery pack on the other transmission circuit is shunted by the shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus by the closed shunt switch. According to the technical scheme, the power output of the battery pack is split and output to the voltage conversion modules through the split switch to carry out power sharing, each voltage conversion module works with low power, the heating value of the voltage conversion module is reduced, and the temperature rise of a parallel operation circuit of the battery pack is reduced. The invention also relates to an energy storage device based on the battery parallel operation circuit.
Description
Technical Field
The invention relates to a battery parallel operation circuit and an energy storage device.
Background
The prior art CN102122826A (application day: 2011-01-17; publication day: 2011-07-13) discloses a high-capacity storage battery energy storage bidirectional converter which supports multi-branch DC/DC module unit access, each storage battery branch gathers direct current energy to a direct current bus, and then the storage battery branch is connected with an alternating current power grid through a later-stage DC/AC converter or independently operates in a load mode. Therefore, the characteristic of wide-range change of the voltage of the battery pack terminal can be considered, the two-stage (DC/DC+DC/AC) multi-group access structure is adopted, the capacity of a single-group storage battery branch is reduced, the number of the battery series-parallel connection is reduced, and the problems of circulation and current sharing of the battery series-parallel connection are solved. However, the above solution has the technical problems of high cost and large heat productivity, and needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problems and provide a battery pack parallel operation circuit and an energy storage device based on the battery pack parallel operation circuit.
The invention provides a battery parallel circuit, which comprises:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs; wherein,
and when one transmission circuit is disconnected, one shunt switch connected with the disconnected transmission circuit is closed, direct current output by the battery pack on the other transmission circuit connected with the closed shunt switch is shunted by the shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the disconnected transmission circuit to the direct current bus.
Further, the output of the corresponding battery pack on a single transmission circuit is suitable for being shunted by the closed shunt switch to meet the maximum power output of the transmission circuit or the maximum power output of the battery pack.
Further, a micro-control unit is also included, which is adapted to control the shunt switch to be selectively opened or closed.
Further, the shunt switch is a normally open switch.
Further, the shunt switch remains open when both of the transmission circuits are on.
Further, the voltage conversion module on each of the transmission circuits is adapted to output a consistent voltage or a voltage differing by less than 0.1V.
Further, the battery pack also comprises a power switch, wherein the power switch is arranged between the battery pack and the voltage conversion module.
Further, the shunt switch and the power switch are controlled by the micro control unit to be selectively opened or closed respectively.
Further, when the battery pack is not connected to the transmission circuit or when the discharge cut-off voltage of the battery pack is lower than a preset threshold value, the micro control unit controls the power switch to be turned off.
Further, the battery pack includes a built-in discharge switch and a BMS protection plate, and when the discharge cutoff voltage of the battery pack is lower than a preset threshold value, the BMS protection plate controls the discharge switch to be turned off.
Further, the voltage conversion module is a DC/DC module or a bidirectional DC/DC module.
Another battery parallel circuit provided by the present invention includes:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs;
a shunt switch is also arranged between the transmission circuits; wherein,
the battery pack parallel circuit comprises at least a first output mode and a second output mode:
when each transmission circuit is conducted in the first output mode, the shunt switch is disconnected, and the corresponding battery pack on each transmission circuit is electrically connected with the direct current bus through the corresponding voltage conversion module;
when a certain transmission circuit is opened, one shunt switch connected with the opened transmission circuit is closed, direct current output by the battery pack on the other transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
The invention provides a battery parallel circuit, which comprises:
n battery packs adapted to output direct current, N >2, respectively;
the transmission circuits are arranged in one-to-one correspondence with the battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery pack is electrically connected with the direct current bus through the voltage conversion module corresponding to the battery pack; wherein,
each of the transmission circuits is configured with a connection node between an output of the battery pack and an input of the voltage conversion module,
a shunt switch is arranged between the connecting nodes, when one transmission circuit is disconnected, one of the shunt switches on two sides of the connecting node on the disconnected transmission circuit is controlled to be disconnected by a preset control logic, the other shunt switch is closed, and the other shunt switches are disconnected;
and one transmission circuit is communicated with the closed shunt switch, the direct current output by the corresponding battery pack is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
Further, when it is detected that only one transmission circuit is turned on, the shunt switches on two sides of the connection node on the turned-on transmission circuit are all turned on, the direct current output by the corresponding battery pack is shunted by the turned-on shunt switches, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other two paths of direct current flows through the voltage conversion module on the turned-off transmission circuit to the direct current bus.
Further, the preset control logic includes:
comparing the voltage of the battery pack on the transmission circuit connected with the other ends of the shunt switches at the two sides of the connection node;
the shunt switch connected with one side of the battery pack with higher voltage is closed, and the shunt switch connected with one side of the battery pack with lower voltage is opened.
The invention provides a battery parallel circuit, which comprises:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs; wherein,
a first node is configured between the output of the battery pack and the input of the voltage conversion module, and the first node is connected with a first shunt switch and a second shunt switch;
the other end of the first shunt switch is connected to a first transmission circuit;
the other end of the second shunt switch is connected to a second transmission circuit;
when the transmission circuit provided with the first node is detected to be opened, one of the first shunt switch and the second shunt switch is controlled to be opened by a preset control logic, the other one of the first shunt switch and the second shunt switch is closed, direct current output by the battery pack on the first transmission circuit or the second transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the closed shunt switch to the direct current bus.
The invention provides an energy storage device, which comprises:
a battery parallel operation circuit as described above;
and the DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current.
Further, the DC/AC module is a bidirectional DC/AC module.
Further, the method further comprises the following steps: the connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs.
Further, when any one of the battery packs is connected to the connection port, the battery pack parallel circuit and the DC/AC module are suitable for supplying power to a first power device; the battery pack is further adapted to supply power to a second power device when any of the battery packs is detached from the connection port.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
the power output of the battery pack can be split and output to a plurality of voltage conversion modules through the split switch to carry out power splitting, each voltage conversion module works with low power, the heating value of the voltage conversion module can be reduced, and the temperature rise of a parallel operation circuit of the battery pack is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1: the specific embodiment of the invention is a schematic block diagram.
Fig. 2: the invention provides a schematic block diagram of a parallel circuit principle of two battery packs.
Fig. 3: the specific embodiment of the invention comprises a schematic block diagram of a power switch.
Fig. 4: the battery pack of the specific embodiment of the invention is provided with a schematic block diagram with a protection principle.
Fig. 5: the battery pack of the specific embodiment of the invention is provided with a protection function and comprises a schematic block diagram of a power switch.
Fig. 6: the invention provides a schematic block diagram of a parallel circuit principle of N battery packs.
Fig. 7: the invention provides a schematic block diagram of a parallel circuit principle of three battery packs.
Fig. 8: in the embodiment of the invention, three battery packs are combined with a schematic block diagram of a circuit principle when only one transmission circuit is conducted.
Fig. 9: the principle schematic diagram of the energy storage device in the embodiment of the invention.
Fig. 10: the energy storage device in the embodiment of the invention is structurally schematic.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a battery combiner circuit 100 includes:
a plurality of battery packs 10 adapted to output direct current;
a plurality of transmission circuits 20 provided in one-to-one correspondence with the plurality of battery packs 10;
each transmission circuit 20 is provided with a voltage conversion module 30;
the plurality of battery packs 10 are respectively and electrically connected with the direct current bus 40 through the voltage conversion modules 30 corresponding to the battery packs; wherein,
and a shunt switch 50 is further arranged between the transmission circuits 20, when one transmission circuit 20 is opened, the shunt switch 50 connected with the transmission circuit 20 is closed, direct current output by the battery pack 10 on the transmission circuit 20 connected with the closed shunt switch 50 is shunted by the closed shunt switch 50, one path of direct current flows through the voltage conversion module 30 on the original transmission circuit 20 to the direct current bus 40, and the other path of direct current flows through the voltage conversion module 30 on the opened transmission circuit 20 to the direct current bus 40 through the closed shunt switch 50.
The battery parallel operation circuit 100 at least includes a first output mode and a second output mode:
when each transmission circuit 20 is turned on in the first output mode, the shunt switch 50 is turned off, and the corresponding battery pack 10 on each transmission circuit 20 is electrically connected with the dc bus 40 through the corresponding voltage conversion module 30;
when a certain transmission circuit 20 is opened, a shunt switch 50 connected with the opened transmission circuit 20 is closed, the direct current output by the battery pack 10 on the other transmission circuit 20 is shunted by the closed shunt switch 50, one path of the direct current flows through the voltage conversion module 30 on the original transmission circuit 20 to the direct current bus 40, and the other path of the direct current flows through the voltage conversion module 30 on the opened transmission circuit 20 to the direct current bus 40 by the closed shunt switch 50.
Specifically, referring to the battery parallel circuit 100 shown in fig. 2, the battery parallel circuit comprises a first battery pack 10a and a second battery pack 10b, the first battery pack 10a corresponds to a first transmission circuit 20a, the second battery pack 10b corresponds to a second transmission circuit 20b, a first voltage conversion module 30a is configured on the first transmission circuit 20a, a second voltage conversion module 30b is configured on the second transmission circuit 20b, the first battery pack 10a is electrically connected with the dc bus 40 through the first voltage conversion module 30a corresponding thereto, the second battery pack 10b is electrically connected with the dc bus 40 through the second voltage conversion module 30b corresponding thereto, and a shunt switch 50 is further disposed between the first transmission circuit 20a and the second transmission circuit 20 b.
Output mode one:
the first battery pack 10a and the second battery pack 10b are respectively connected to the first transmission circuit 20a and the second transmission circuit 20b, the shunt switch 50 is turned off, the first battery pack 10a is electrically connected with the direct current bus 40 through the first voltage conversion module 30a, and the second battery pack 10b is electrically connected with the direct current bus 40 through the second voltage conversion module 30 b.
Output mode two:
the first transmission circuit 20a is opened, the open point is located at the front end of the connection node N on the transmission circuit, the shunt switch 50 is closed, the direct current output by the second battery pack 10b on the second transmission circuit 20b is shunted by the shunt switch 50, and as indicated by the arrow indication direction in fig. 2, one path of direct current flows through the original transmission circuit, namely, the second voltage conversion module 30b on the second transmission circuit 20b to the direct current bus 40, and the other path of direct current flows through the open transmission circuit, namely, the first voltage conversion module 30a on the first transmission circuit 20a to the direct current bus 40; or alternatively, the first and second heat exchangers may be,
the second transmission circuit 20b is opened, the open point is located at the front end of the connection node N on the transmission circuit, the shunt switch 50 is closed, the direct current output by the first battery pack 10a on the first transmission circuit 20a is shunted by the shunt switch 50, one path of the direct current flows through the original transmission circuit, namely, the first voltage conversion module 30a on the first transmission circuit 20a to the direct current bus 40, and the other path of the direct current flows through the open transmission circuit, namely, the second voltage conversion module 30b on the second transmission circuit 20b to the direct current bus 40.
In this way, the power output of the second battery pack 10b can be split and output to the first voltage conversion module 30a and the second voltage conversion module 30b through the split switch 50 for power splitting, and each voltage conversion module will work with low power, so that the heat productivity of the voltage conversion module can be reduced, and the temperature rise of the battery pack parallel circuit 100 can be reduced.
Further, when p1max is greater than or equal to p1+p2 and p2max is greater than or equal to p1+p2, when any one of the transmission circuits is turned off, the battery pack connected to the other transmission circuit will be shunted to output to the first voltage conversion module 30a and the second voltage conversion module 30b through the shunt switch 50 and satisfy the maximum power output of the first voltage conversion module 30a and the second voltage conversion module 30b, so that the single battery pack can realize the maximum power output of the multiplexing circuit, even realize the maximum power output of the dc bus 40, and in the application of the energy storage device 200, the single battery pack can also satisfy the rated power output of the inverter. Compared with the prior art CN102122826A, the maximum power output of the direct current bus and the rated power output of the inverter can be realized only if two groups of battery packs are connected into the transmission circuit.
When any one of the transmission circuits is turned off, the battery pack connected to the other transmission circuit will be shunted to the first voltage conversion module 30a and the second voltage conversion module 30b through the shunt switch 50 so that the maximum power output of the battery pack can be satisfied when p1+p2> p1max and p1+p2> p2 max.
Wherein, P1max is the maximum output power of the first battery pack 10a, and P2max is the maximum output power of the second battery pack 10 b; p1 is the maximum output power of the first voltage conversion module 30a, and P2 is the maximum output power of the second voltage conversion module 30 b.
Brief description of the drawings:
setting p1max=p2max=400w, p1=p2=150w, at this time, p1max > p1+p2, p2max > p1+p2;
when the first transmission circuit 20a is opened and the shunt switch 50 is closed, the direct current output by the second battery pack 10b on the second transmission circuit 20b is shunted by the shunt switch 50, and the output of the second battery pack 10b can meet the output of the voltage conversion module 30a and the second voltage conversion module 30b on each transmission circuit with the maximum output power of 150W, so that the maximum power output of the first transmission circuit 20a and the second transmission circuit 20b can be realized by only a single second battery pack 10b, in this specific embodiment, the maximum power output of the direct current bus 40 can also be realized, and in the application of the energy storage device 200, the rated power output of the inverter can also be met by only a single second battery pack 10 b.
It will be appreciated that, according to the technical solution of the prior art CN102122826a, when the first transmission circuit 20a is turned off, the second battery pack 10b is required to achieve the maximum power output of the dc bus 40 at substantially 300W, and the maximum output power of the second voltage conversion module 30b is required to be set to 300W, which increases the cost and the heat generation amount of the second voltage conversion module 30 b.
Therefore, compared with the prior art, the technical scheme of the invention has the advantages of low cost and small heating value.
Setting p1max=p2max=400w, p1=p2=300w, at this time p1+p2> p1max, p1+p2> p2max;
when the first transmission circuit 20a is opened and the shunt switch 50 is closed, the direct current output by the second battery pack 10b on the second transmission circuit 20b is shunted by the shunt switch 50, and the power output of each transmission circuit is basically 200W, so that the maximum power output of the second battery pack 10b can be satisfied.
It will also be appreciated that, if the first transmission circuit 20a is turned off according to the prior art CN102122826a solution, the second battery pack 10b can only output at a power of substantially 300W, and the maximum power output cannot be achieved.
In summary, compared with the prior art, the technical scheme of the invention has the beneficial technical effects of low cost and small heating value.
Further, wherein the shunt switch 50 is a normally open switch. Of course, a normally closed switch is also possible.
When the shunt switch 50 is a normally open switch, the shunt switch 50 needs to be controlled to be closed when a certain transmission circuit 20 is opened, and the shunt switch 50 is controlled to be opened when the transmission circuit 20 is detected to be all on.
When the shunt switch 50 is a normally closed switch, the shunt switch 50 needs to be controlled to be kept closed when a certain transmission circuit 20 is opened, and the shunt switch 50 needs to be controlled to be opened when the transmission circuit 20 is detected to be all on.
Specifically, the shunt switch 50 is electrically connected to a Micro Control Unit (MCU), and is controlled by the MCU to selectively open or close.
The shunt switch 50 may be a field effect transistor ("FET") switch or relay, such as a MOSFET.
When the shunt switch 50 is a normally open switch, the Micro Control Unit (MCU) controls the shunt switch 50 to be closed when detecting that a certain transmission circuit 20 is opened, and controls the shunt switch 50 to be opened when detecting that the transmission circuits 20 are all closed.
When the shunt switch 50 is a normally closed switch, the Micro Control Unit (MCU) controls the shunt switch 50 to be kept closed when detecting that a certain transmission circuit 20 is opened, and controls the shunt switch 50 to be opened when detecting that all transmission circuits 20 are closed.
Further, with continued reference to fig. 1 and 2, the voltage conversion modules 30 on each transmission circuit 20 are adapted to output a substantially uniform voltage, which means that the voltage conversion modules 30 on each transmission circuit 20 output the same uniform voltage.
Thus, when a plurality of battery packs are assembled on the transmission circuit 20, the voltage output by the voltage conversion module 30 on each transmission circuit 20 can be ensured to be balanced, and the battery packs are effectively prevented from being reversely charged.
Referring to fig. 3, the battery pack parallel operation circuit 100 further includes a power switch 60, the power switch 60 being interposed between the battery pack 10 and the voltage conversion module 30, wherein the power switch 60 is also controlled by a Micro Control Unit (MCU) to be selectively opened or closed.
Specifically, the battery pack 10 is communicatively connected to a Micro Control Unit (MCU), when the battery pack 10 accesses the corresponding transmission circuit 20 and the communication is successfully established, the Micro Control Unit (MCU) controls the power switch 60 on the corresponding transmission circuit 20 to be turned on, otherwise, the power switch is kept turned off, and when the Micro Control Unit (MCU) detects that the battery pack 10 is abnormal or receives abnormal information of the battery pack 10, if the discharge cut-off voltage is lower than a preset threshold, the Micro Control Unit (MCU) controls the power switch 60 on the corresponding transmission circuit 20 to be turned off.
In this way, when the battery pack 10 is not connected to the transmission circuit 20 or the battery pack 10 is abnormal in information, such as the discharge cut-off voltage is lower than a preset threshold, the micro control unit controls the power switch 60 to be turned off.
In addition, the shunt switch 50 is electrically connected to and controlled by a Micro Control Unit (MCU) as described above to be selectively opened or closed.
In another possible embodiment, referring specifically to fig. 4 and 5, the battery pack 10 includes a built-in discharge switch 102 and a BMS protection plate 101, and when the information of the battery pack 10 is abnormal, such as the discharge cut-off voltage is lower than a preset threshold value, the BMS protection plate 101 controls the discharge switch 102 to be turned off, so that the battery pack will have a protection function, and when the information of the battery pack 10 itself is abnormal, the BMS protection plate 101 will cut off the output of the battery pack 10 by turning off the discharge switch 102, particularly when the discharge cut-off voltage of the battery pack 10 is lower than the preset threshold value, the BMS protection plate 101 controls the discharge switch 102 to be turned off, thereby avoiding overdischarge.
At this time, the power switch 60 may be further simultaneously configured on the transmission circuit, and when the BMS protection board 101 of the battery pack 10 controls the discharge switch 102 to be turned off, the Micro Control Unit (MCU) simultaneously controls the power switch 60 to be turned off, thereby forming multiple protection for the battery pack and the battery pack circuit 100.
Further, the voltage conversion module 30 is a DC/DC module, preferably the DC/DC module is a bidirectional DC/DC module, so that the battery pack 10 can be reversely charged by the bidirectional DC/DC module.
In another embodiment, referring specifically to fig. 6, a battery combiner circuit 100 includes:
n battery packs adapted to output direct current, N >2, respectively;
the transmission circuits are arranged in one-to-one correspondence with the battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses 40 through the voltage conversion modules corresponding to the battery packs; wherein,
each transmission circuit is provided with a connection node N between the output of the battery pack and the input of the voltage conversion module,
a shunt switch is arranged between the connecting nodes N, when a certain transmission circuit is detected to be disconnected, one of the shunt switches connected with the connecting nodes N on the disconnected transmission circuit is controlled to be disconnected by a preset control logic, the other shunt switch is closed, and the other shunt switches are disconnected;
one transmission circuit is communicated with the closed shunt switch, and direct current output by the corresponding battery pack is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus 40, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
Wherein, the preset control logic comprises:
comparing the voltage of the battery pack on the transmission circuit connected with the other ends of the shunt switches at the two sides of the connection node N;
the shunt switch connected with one side of the battery pack with higher voltage is closed, and the shunt switch connected with one side of the battery pack with lower voltage is opened.
Referring to fig. 7, a battery combining circuit 100 having three battery packs 10 is specifically taken as an example. The battery pack combining circuit 100 includes:
a first battery pack 10a, a first transmission circuit 20a and a first voltage conversion module 30a corresponding thereto;
a second battery pack 10b, a second transmission circuit 20b and a second voltage conversion module 30b corresponding thereto;
a third battery pack 10c, a third transmission circuit 20c and a third voltage conversion module 30c corresponding thereto;
each battery pack is electrically connected with the direct current bus 40 through a voltage conversion module corresponding to the battery pack; wherein,
the first transmission circuit 20a is configured with a first connection node N1 between the output of the first battery pack 10a and the input of the first voltage conversion module 30a;
the second transmission circuit 20b is provided with a second connection node N2 between the output of the second battery pack 10b and the input of the second voltage conversion module 30b;
the third transmission circuit 20c is configured with a third connection node N3 between the output of the third battery pack 10c and the input of the third voltage conversion module 30c;
a first shunt switch 50a is arranged between the first connecting node N1 and the second connecting node N2, a second shunt switch 50b is arranged between the second connecting node N2 and the third connecting node N3, and a third shunt switch 50c is arranged between the third connecting node N3 and the first connecting node N1.
When detecting that the first transmission circuit 20a is opened, a preset control logic is used to control the shunt switches connected to two sides of the first connection node N1 on the first transmission circuit 20a, that is, one of the third shunt switch 50c and the first shunt switch 50a is opened, the other is closed, and the second shunt switch 50b is opened;
the second transmission circuit 20b or the third transmission circuit 20c is communicated with a closed shunt switch, and direct current output by the corresponding second battery pack 10b or third battery pack 10c is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus 40, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus 40.
Specifically, taking the preset logic to control the third shunt switch 50c to be opened, the first shunt switch 50a is closed, the second shunt switch 50b is opened, at this time, the second transmission circuit 20b is connected to the closed shunt switch, the direct current output by the corresponding second battery pack 10b is shunted by the closed first shunt switch 50a, one path of direct current flows through the original transmission circuit, that is, the second voltage conversion module 30b on the second transmission circuit 20b to the direct current bus 40, the other path of direct current flows through the open transmission circuit, that is, the first voltage conversion module 30a on the first transmission circuit 20a to the direct current bus 40, and the third battery pack 10c on the third transmission circuit 20c flows through the corresponding third voltage conversion module 30c to the direct current bus 40.
Further, as shown in fig. 7, the shunt switches on both sides of the first connection node N1 are a first shunt switch 50a and a third shunt switch 50c, respectively, the other end of the first shunt switch 50a is connected to the second transmission circuit 20b, and the other end of the third shunt switch 50c is connected to the third transmission circuit 20c.
In the above-mentioned preset control logic, the voltage of the battery pack 10 on the transmission circuit 20 connected to the other end of the shunt switch at both sides of the first connection node N1 is compared, that is, the voltage of the second battery pack 10b and the voltage of the third battery pack 10c are compared.
When the voltage of the second battery pack 10b is set to be higher than the voltage of the third battery pack 10c, the first shunt switch 50a connected to the second battery pack 10b is closed, the third shunt switch 50c is opened, the rest of the second shunt switches 50b are opened, at this time, the second transmission circuit 20b is connected to the closed first shunt switch 50a, the direct current output by the corresponding second battery pack 10b is shunted by the closed first shunt switch 50a, one path flows through the original transmission circuit, i.e., the second voltage conversion module 30b on the second transmission circuit 20b to the direct current bus 40, the other path flows through the open transmission circuit, i.e., the first voltage conversion module 30a on the first transmission circuit 20a to the direct current bus 40, and the third battery pack 10c on the third transmission circuit 20c flows through the corresponding third voltage conversion module 30c to the direct current bus 40.
In addition, referring to fig. 8, when it is detected that only one transmission circuit 20 is turned on, the shunt switches 50 on both sides of the connection node N on the transmission circuit 20 that is controlled to be turned on are all turned on, the other shunt switches are turned off, the direct current output by the corresponding battery pack 10 is shunted by the turned-on shunt switches 50, one path of direct current flows through the voltage conversion module 30 on the original transmission circuit 20 to the direct current bus 40, and the other two paths of direct current flows through the voltage conversion module 30 on the turned-off transmission circuit 20 to the direct current bus 40 via the turned-on shunt switches 50.
Specifically, when only the second transmission circuit 20b corresponding to the second battery pack 10b is turned on, the first shunt switch 50a and the second shunt switch 50b on both sides of the second connection node N2 on the second transmission circuit 20b are controlled to be closed, the third shunt switch 50c is opened, one path of the direct current output by the second battery pack 10b flows through the second voltage conversion module 30b on the original second transmission circuit 20b to the direct current bus 40, and the other two paths of direct current respectively flow through the closed first shunt switch 50a and the second shunt switch 50b to the direct current bus 40 via the opened voltage conversion modules on the first transmission circuit 20a and the third transmission circuit 20c.
In addition, the present invention relates to an energy storage device 200, and in particular, referring to fig. 9 and 10, the energy storage device 200 includes:
the battery pack parallel circuit 100 as described above;
the DC/AC module 200a is electrically connected to the DC bus 40, and is adapted to invert the DC power collected and output by the DC bus 40 to output AC power.
Further, wherein the DC/AC module 200a is a bi-directional DC/AC module 200a.
Further, the method further comprises the following steps:
and connection ports 200b, which are provided in one-to-one correspondence with the battery packs 10, are adapted to mechanically and electrically connect the battery packs 10, and are detachably connected with the battery packs 10.
Further, when any one of the battery packs 10 is connected to the connection port 200b, the circuit 100 and the DC/AC module 200a are connected in parallel by the battery pack to supply power to the first power device; the battery pack 10 is also adapted to supply power to the second power device when any of the battery packs 10 is detached from the connection port 200 b.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (20)
1. A battery pack parallel operation circuit, comprising:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs; wherein,
and when one transmission circuit is opened, one shunt switch connected with the opened transmission circuit is closed, the direct current output by the battery pack on the other transmission circuit connected with the closed shunt switch is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
2. The battery pack parallel operation circuit according to claim 1, wherein: the output of the corresponding battery pack on the single transmission circuit is suitable for being shunted by the closed shunt switch so as to meet the maximum power output of the transmission circuit or the maximum power output of the battery pack.
3. The battery pack parallel operation circuit according to claim 1 or 2, wherein: and a micro-control unit adapted to control the shunt switch to be selectively opened or closed.
4. A battery pack parallel operation circuit according to claim 3, wherein: the shunt switch is a normally open switch.
5. The battery pack parallel operation circuit according to claim 4, wherein: when the transmission circuits are all on, the shunt switch is kept off.
6. The battery pack parallel operation circuit according to claim 1, wherein: the voltage conversion modules on each of the transmission circuits are adapted to output a consistent voltage or a voltage differing by less than 0.1V.
7. The battery pack parallel operation circuit according to claim 1, wherein: the battery pack also comprises a power switch, wherein the power switch is arranged between the battery pack and the voltage conversion module.
8. The battery pack parallel operation circuit according to claim 7, wherein: the shunt switch and the power switch are respectively controlled by the micro-control unit to be selectively opened or closed.
9. The battery pack parallel operation circuit according to claim 8, wherein: and when the battery pack is not connected into the transmission circuit or the discharge cut-off voltage of the battery pack is lower than a preset threshold value, the micro control unit controls the power switch to be disconnected.
10. The battery pack parallel operation circuit according to claim 1 or 7 or 8 or 9, wherein: the battery pack comprises a built-in discharge switch and a BMS protection board, and when the discharge cut-off voltage of the battery pack is lower than a preset threshold value, the BMS protection board controls the discharge switch to be disconnected.
11. The battery pack parallel operation circuit according to claim 1, wherein: the voltage conversion module is a DC/DC module or a bidirectional DC/DC module.
12. A battery pack parallel operation circuit, comprising:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs;
a shunt switch is also arranged between the transmission circuits; wherein,
the battery pack parallel circuit comprises at least a first output mode and a second output mode:
when each transmission circuit is conducted in the first output mode, the shunt switch is disconnected, and the corresponding battery pack on each transmission circuit is electrically connected with the direct current bus through the corresponding voltage conversion module;
when a certain transmission circuit is opened, one shunt switch connected with the opened transmission circuit is closed, direct current output by the battery pack on the other transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
13. A battery pack parallel operation circuit, comprising:
n battery packs adapted to output direct current, N >2, respectively;
the transmission circuits are arranged in one-to-one correspondence with the battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery pack is electrically connected with the direct current bus through the voltage conversion module corresponding to the battery pack; wherein,
each of the transmission circuits is configured with a connection node between an output of the battery pack and an input of the voltage conversion module,
a shunt switch is arranged between the connecting nodes, when one transmission circuit is disconnected, one of the shunt switches on two sides of the connecting node on the disconnected transmission circuit is controlled to be disconnected by a preset control logic, the other shunt switch is closed, and the other shunt switches are disconnected;
and one transmission circuit is communicated with the closed shunt switch, the direct current output by the corresponding battery pack is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the voltage conversion module on the opened transmission circuit to the direct current bus.
14. The battery pack parallel operation circuit according to claim 13, wherein: when detecting that only one transmission circuit is conducted, the shunt switches on two sides of the connecting node on the conducted transmission circuit are all closed, the direct current output by the corresponding battery pack is shunted by the closed shunt switches, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other two paths of direct current flows through the voltage conversion module on the disconnected transmission circuit to the direct current bus.
15. The battery pack parallel operation circuit according to claim 13, wherein: the preset control logic comprises:
comparing the voltage of the battery pack on the transmission circuit connected with the other ends of the shunt switches at the two sides of the connection node;
the shunt switch connected with one side of the battery pack with higher voltage is closed, and the shunt switch connected with one side of the battery pack with lower voltage is opened.
16. A battery pack parallel operation circuit, comprising:
a plurality of battery packs adapted to output direct current;
a plurality of transmission circuits arranged in one-to-one correspondence with the plurality of battery packs;
each transmission circuit is configured with a voltage conversion module;
the battery packs are respectively and electrically connected with the direct current buses through the voltage conversion modules corresponding to the battery packs; wherein,
a first node is configured between the output of the battery pack and the input of the voltage conversion module, and the first node is connected with a first shunt switch and a second shunt switch;
the other end of the first shunt switch is connected to a first transmission circuit;
the other end of the second shunt switch is connected to a second transmission circuit;
when the transmission circuit provided with the first node is detected to be opened, one of the first shunt switch and the second shunt switch is controlled to be opened by a preset control logic, the other one of the first shunt switch and the second shunt switch is closed, direct current output by the battery pack on the first transmission circuit or the second transmission circuit is shunted by the closed shunt switch, one path of direct current flows through the voltage conversion module on the original transmission circuit to the direct current bus, and the other path of direct current flows through the closed shunt switch to the direct current bus.
17. An energy storage device, comprising:
a battery parallel operation circuit according to any one of claims 1 to 16;
and the DC/AC module is electrically connected with the direct current bus and is suitable for inverting the direct current converged and output by the direct current bus to output alternating current.
18. The energy storage device of claim 17, wherein: the DC/AC module is a bidirectional DC/AC module.
19. The energy storage device of claim 17, further comprising:
the connecting ports are arranged in one-to-one correspondence with the battery packs, are suitable for mechanically and electrically connecting the battery packs and are detachably connected with the battery packs.
20. The energy storage device of claim 19, wherein: when any one of the battery packs is connected to the connection port, the battery pack parallel circuit and the DC/AC module are suitable for supplying power to a first power device; the battery pack is further adapted to supply power to a second power device when any of the battery packs is detached from the connection port.
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| CN2024100804923 | 2024-01-19 | ||
| CN202410080492 | 2024-01-19 |
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