Energy storage device

Abstract

The utility model provides an energy storage device, which comprises a plurality of battery packs and a plurality of transmission circuits arranged correspondingly, each transmission circuit is provided with a voltage conversion module, and the battery packs are electrically connected with a direct current bus through the corresponding voltage conversion modules respectively; a shunt switch is arranged between the transmission circuits, when one transmission circuit is disconnected, the shunt switch is closed, direct current output by a battery pack on the other transmission circuit is shunted through the shunt switch, and one path of direct current flows through a voltage conversion module on the original transmission circuit to a direct current bus. And the other path passes through the closed shunt switch, flows through the voltage conversion module on the disconnected transmission circuit, is transmitted to the direct current bus, and is inverted by the DC / AC module to output alternating current. According to the technical scheme, the power output of the battery pack is shunted through the shunt switch and output to the plurality of voltage conversion modules for power allocation, and each voltage conversion module works with low power, so that the heating value of the voltage conversion modules is reduced, and the temperature rise of a parallel circuit of the battery pack is reduced.

Description

Technical Field

[0001] This utility model relates to an energy storage device. Background Technology

[0002] Existing technology CN102122826A (application date: 2011-01-17; publication date: 2011-07-13) discloses a large-capacity battery energy storage bidirectional converter, which supports the connection of multiple branch DC / DC module units. Each battery branch collects DC energy to the DC bus, and then connects to the AC grid or operates independently through the subsequent DC / AC converter. This approach can accommodate the wide range of battery terminal voltage variations. The two-stage (DC / DC + DC / AC) multi-group access structure reduces the capacity of a single battery branch, decreases the number of batteries connected in series and parallel, and solves the circulating current and current sharing problems of battery series and parallel connections. However, the above solution suffers from high cost and high heat generation, requiring further improvement. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problems and provide an energy storage device.

[0004] This utility model provides an energy storage device, which includes:

[0005] Multiple battery packs, suitable for outputting direct current;

[0006] Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack;

[0007] DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power.

[0008] When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes:

[0009] Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs;

[0010] Each of the aforementioned transmission circuits is equipped with a voltage conversion module;

[0011] Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module; wherein,

[0012] A shunt switch is also provided between the transmission circuits. When one of the transmission circuits is disconnected, the shunt switch connected to the disconnected transmission circuit closes. The DC power output from the battery pack on the other transmission circuit connected to the closed shunt switch is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

[0013] Furthermore, the output of the battery pack corresponding to a single transmission circuit is adapted to be shunt by the closed shunt switch to meet the maximum power output of multiple transmission circuits or the maximum power output of the battery pack itself.

[0014] Furthermore, it also includes a microcontroller unit adapted to control the shunt switch to selectively open or close.

[0015] Furthermore, the shunt switch is a normally open switch.

[0016] Furthermore, when all the transmission circuits are on, the shunt switch remains off.

[0017] Furthermore, the voltage conversion module on each of the transmission circuits is adapted to output a consistent voltage or voltages that differ by less than 0.1V.

[0018] Furthermore, it also includes a power switch, which is located between the battery pack and the voltage conversion module.

[0019] Furthermore, the shunt switch and the power switch are respectively controlled by the microcontroller unit to selectively open or close.

[0020] Furthermore, when the battery pack is not connected to the transmission circuit or when the battery pack's discharge cutoff voltage is lower than a preset threshold, the microcontroller controls the power switch to turn off.

[0021] Furthermore, the battery pack includes a built-in discharge switch and a BMS protection board. When the discharge cutoff voltage of the battery pack is lower than a preset threshold, the BMS protection board controls the discharge switch to open.

[0022] Furthermore, the voltage conversion module is a DC / DC module or a bidirectional DC / DC module.

[0023] This utility model provides another energy storage device, which includes:

[0024] Multiple battery packs, suitable for outputting direct current;

[0025] Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack;

[0026] DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power.

[0027] When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes:

[0028] Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs;

[0029] Each of the aforementioned transmission circuits is equipped with a voltage conversion module;

[0030] Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module;

[0031] A shunt switch is also provided between the transmission circuits; wherein...

[0032] The battery pack parallel circuit includes at least a first output mode and a second output mode:

[0033] The first output mode is that when each of the transmission circuits is turned on, the shunt switch is turned off, and the battery pack corresponding to each of the transmission circuits is electrically connected to the DC bus through the corresponding voltage conversion module.

[0034] In the second output mode, when one of the transmission circuits is disconnected, a shunt switch connected to the disconnected transmission circuit is closed, and the DC power output from the battery pack on the other transmission circuit is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

[0035] This utility model provides another energy storage device, which includes:

[0036] There are N battery packs, each of which is suitable for outputting direct current, where N>2;

[0037] Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack;

[0038] DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power.

[0039] When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes:

[0040] A transmission circuit is provided that corresponds one-to-one with each of the battery packs;

[0041] Each of the aforementioned transmission circuits is equipped with a voltage conversion module;

[0042] The battery packs are each electrically connected to the DC bus via their corresponding voltage conversion modules; wherein...

[0043] Each of the aforementioned transmission circuits is configured with a connection node between the output of the battery pack and the input of the voltage conversion module.

[0044] A shunt switch is provided between the connection nodes. When a certain transmission circuit is disconnected, a preset control logic controls one of the shunt switches on both sides of the connection node on the disconnected transmission circuit to open, the other to close, and the remaining shunt switches to open.

[0045] Each of the transmission circuits is connected to the closed shunt switch. The DC power output from the corresponding battery pack is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the open transmission circuit to the DC bus.

[0046] Furthermore, when it is detected that only one of the transmission circuits is conducting, the shunt switches on both sides of the connection node on the conducting transmission circuit are closed. The DC power output from the corresponding battery pack is shunted through the closed shunt switches. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, while the other two paths flow through the closed shunt switches through the voltage conversion module on the disconnected transmission circuit to the DC bus.

[0047] This utility model provides another energy storage device, which includes:

[0048] Multiple battery packs, suitable for outputting direct current;

[0049] Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack;

[0050] DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power.

[0051] When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes:

[0052] Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs;

[0053] Each of the aforementioned transmission circuits is equipped with a voltage conversion module;

[0054] Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module; wherein,

[0055] 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 to a first shunt switch and a second shunt switch;

[0056] The other end of the first shunt switch is connected to the first transmission circuit;

[0057] The other end of the second shunt switch is connected to the second transmission circuit;

[0058] When the transmission circuit configured with the first node is detected to be disconnected, a preset control logic controls one of the first shunt switch and the second shunt switch to open and the other to close. The DC power output by the battery pack on the first transmission circuit or the second transmission circuit is shunted through the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

[0059] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0060] The power output of the battery pack can be distributed to multiple voltage conversion modules through a shunt switch. Each voltage conversion module will operate at low power, which can reduce the heat generation of the voltage conversion module and reduce the temperature rise of the battery pack parallel circuit and energy storage device. Attached Figure Description

[0061] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0062] Figure 1 : Schematic block diagram of a specific embodiment of this utility model.

[0063] Figure 2 : A schematic block diagram of the parallel operation circuit of two battery packs in a specific embodiment of this utility model.

[0064] Figure 3 This utility model includes a schematic block diagram illustrating the principle of a power switch in a specific embodiment.

[0065] Figure 4 : A schematic block diagram illustrating the built-in protection principle of the battery pack in a specific embodiment of this utility model.

[0066] Figure 5 This utility model is illustrated in the schematic diagram of a battery pack with built-in protection and a power switch according to a specific embodiment.

[0067] Figure 6 : A schematic block diagram of the parallel circuit principle of N battery packs in a specific embodiment of this utility model.

[0068] Figure 7 : A schematic block diagram of the parallel operation circuit of three battery packs in a specific embodiment of this utility model.

[0069] Figure 8 This utility model is a schematic block diagram illustrating the parallel operation principle of three battery packs when only one transmission circuit is active.

[0070] Figure 9 : Schematic diagram of the energy storage device in a specific embodiment of this utility model.

[0071] Figure 10 : Schematic diagram of the energy storage device structure of a specific embodiment of this utility model. Detailed Implementation

[0072] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0073] Reference Figure 1 A battery pack parallel circuit 100 shown includes:

[0074] Multiple battery packs 10, which are suitable for outputting direct current;

[0075] Multiple transmission circuits 20 are configured one-to-one with multiple battery packs 10;

[0076] Each transmission circuit 20 is equipped with a voltage conversion module 30;

[0077] Multiple battery packs 10 are electrically connected to the DC bus 40 via their corresponding voltage conversion modules 30; among them,

[0078] A shunt switch 50 is also provided between the transmission circuits 20. When a transmission circuit 20 is disconnected, the shunt switch 50 connected to it is closed. The DC power output from the battery pack 10 on the transmission circuit 20 connected to the closed shunt switch 50 is shunted through the closed shunt switch 50. One path flows through the voltage conversion module 30 on the original transmission circuit 20 to the DC bus 40, and the other path flows through the closed shunt switch 50 through the voltage conversion module 30 on the disconnected transmission circuit 20 to the DC bus 40.

[0079] This battery pack parallel circuit 100 includes at least a first output mode and a second output mode:

[0080] The first output mode is that when each transmission circuit 20 is turned on, the shunt switch 50 is turned off, and the corresponding battery pack 10 on each transmission circuit 20 is electrically connected to the DC bus 40 through the corresponding voltage conversion module 30.

[0081] In the second output mode, when a certain transmission circuit 20 is disconnected, a shunt switch 50 connected to the disconnected transmission circuit 20 is closed. The DC power output from the battery pack 10 on the other transmission circuit 20 is shunted through the closed shunt switch 50. One path flows through the voltage conversion module 30 on the original transmission circuit 20 to the DC bus 40, and the other path flows through the closed shunt switch 50 through the voltage conversion module 30 on the disconnected transmission circuit 20 to the DC bus 40.

[0082] Specifically, refer to Figure 2 The battery pack parallel circuit 100 shown includes a first battery pack 10a and a second battery pack 10b. The first battery pack 10a corresponds to a first transmission circuit 20a, and 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, and a second voltage conversion module 30b is configured on the second transmission circuit 20b. The first battery pack 10a is electrically connected to the DC bus 40 through its corresponding first voltage conversion module 30a, and the second battery pack 10b is electrically connected to the DC bus 40 through its corresponding second voltage conversion module 30b. A shunt switch 50 is also provided between the first transmission circuit 20a and the second transmission circuit 20b.

[0083] Output Mode 1:

[0084] 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 to the DC bus 40 through the first voltage conversion module 30a, and the second battery pack 10b is electrically connected to the DC bus 40 through the second voltage conversion module 30b.

[0085] Output Mode 2:

[0086] The first transmission circuit 20a is disconnected, with the disconnection point located at the front end of connection node N on the transmission circuit. The shunt switch 50 is closed, and the DC power output from the second battery pack 10b on the second transmission circuit 20b is shunted by the shunt switch 50. (Refer to...) Figure 2 As indicated by the middle arrow, one path flows through the original transmission circuit, i.e., the second voltage conversion module 30b on the second transmission circuit 20b to the DC bus 40; the other path flows through the closed shunt switch 50 and through the open transmission circuit, i.e., the first voltage conversion module 30a on the first transmission circuit 20a to the DC bus 40; or,

[0087] The second transmission circuit 20b is disconnected, with the disconnection point located at the front end of the connection node N on the transmission circuit. The shunt switch 50 is closed, and the DC power output from the first battery pack 10a on the first transmission circuit 20a is shunted by the shunt switch 50. One path flows through the original transmission circuit, i.e., the first voltage conversion module 30a on the first transmission circuit 20a to the DC bus 40, and the other path flows through the closed shunt switch 50 through the disconnected transmission circuit, i.e., the second voltage conversion module 30b on the second transmission circuit 20b to the DC bus 40.

[0088] In this way, the power output of the second battery pack 10b can be shunt by the shunt switch 50 to the first voltage conversion module 30a and the second voltage conversion module 30b for power sharing. Each voltage conversion module will work at a low power, which can reduce the heat generation of the voltage conversion module and reduce the temperature rise of the battery pack parallel circuit 100.

[0089] Furthermore, when P1max ≥ P1 + P2 and P2max ≥ P1 + P2, when any transmission circuit is disconnected, the battery pack connected to the other transmission circuit will be shunted through the shunt switch 50 to the first voltage conversion module 30a and the second voltage conversion module 30b, satisfying the maximum power output of the first voltage conversion module 30a and the second voltage conversion module 30b. This allows a single battery pack to achieve the maximum power output of multiple transmission circuits, and even the maximum power output of the DC bus 40. In the application of the energy storage device 200, a single battery pack can also meet the rated power output of the inverter. In contrast, the existing technology CN102122826A requires both battery packs to be connected to the transmission circuit to achieve the maximum power output of the DC bus and the rated power output of the inverter.

[0090] When P1+P2>P1max and P1+P2>P2max, if any transmission circuit is disconnected, the battery pack connected to the other transmission circuit will be shunted through the shunt switch 50 to the first voltage conversion module 30a and the second voltage conversion module 30b so that the maximum power output of the battery pack can be met.

[0091] Wherein, P1max is the maximum output power of the first battery pack 10a, P2max is the maximum output power of the second battery pack 10b; 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 30b.

[0092] Brief examples:

[0093] Set P1max=P2max=400W, P1=P2=150w. At this time, P1max≧P1+P2, P2max≧P1+P2.

[0094] When the first transmission circuit 20a is disconnected and the shunt switch 50 is closed, the DC power output from the second battery pack 10b on the second transmission circuit 20b is shunted by the shunt switch 50. The output of the second battery pack 10b can meet the maximum output power of 150W of the voltage conversion modules 30a and 30b on each transmission circuit, so that the maximum power output of the first transmission circuit 20a and the second transmission circuit 20b can be achieved by the single second battery pack 10b. In this specific embodiment, the maximum power output of the DC bus 40 can also be achieved. In the application of the energy storage device 200, the rated power output of the inverter can also be met by the single second battery pack 10b.

[0095] It is understandable that, according to the existing technology CN102122826A, when the first transmission circuit 20a is disconnected, the second battery pack 10b needs to achieve a maximum power output of 300W for the DC bus 40. Therefore, the maximum output power of the second voltage conversion module 30b needs to be set to 300W. This increases the cost and also causes the second voltage conversion module 30b to generate a lot of heat.

[0096] Therefore, it can be seen that the technical solution of this utility model has lower cost and less heat generation than the existing technology.

[0097] Set P1max = P2max = 400W, P1 = P2 = 300W. At this time, P1 + P2 > P1max, P1 + P2 > P2max.

[0098] When the first transmission circuit 20a is disconnected and the shunt switch 50 is closed, the DC power output from the second battery pack 10b on the second transmission circuit 20b is shunt by the shunt switch 50, and will be output at a power of approximately 200W for each transmission circuit, thus satisfying the maximum power output of the second battery pack 10b.

[0099] Similarly, it is understandable that, according to the existing technology CN102122826A, when the first transmission circuit 20a is disconnected, the second battery pack 10b can only output a basic power of 300W and cannot achieve the maximum power output.

[0100] In summary, the present invention has the advantages of lower cost and less heat generation compared with the prior art.

[0101] Furthermore, the shunt switch 50 is a normally open switch. Of course, it can also be a normally closed switch.

[0102] When the shunt switch 50 is a normally open switch, it is necessary to control the shunt switch 50 to close when a certain transmission circuit 20 is disconnected, and to control the shunt switch 50 to remain open when all transmission circuits 20 are detected to be conducting.

[0103] When the shunt switch 50 is a normally closed switch, it is necessary to control the shunt switch 50 to remain closed when a certain transmission circuit 20 is disconnected, and to control the shunt switch 50 to open when all transmission circuits 20 are detected to be conducting.

[0104] Specifically, the aforementioned shunt switch 50 is electrically connected to a microcontroller unit (MCU) and is controlled by the MCU to selectively open or close.

[0105] The aforementioned shunt switch 50 can be a field-effect transistor ("FET") switch or a relay, such as a MOSFET.

[0106] When the shunt switch 50 is a normally open switch, if the microcontroller unit (MCU) detects that a certain transmission circuit 20 is open, it will control the shunt switch 50 to close. If the microcontroller unit (MCU) detects that all transmission circuits 20 are on, it will control the shunt switch 50 to remain open.

[0107] When the shunt switch 50 is a normally closed switch, if the microcontroller unit (MCU) detects that a certain transmission circuit 20 is open, the microcontroller unit (MCU) controls the shunt switch 50 to remain closed. If the microcontroller unit (MCU) detects that all transmission circuits 20 are open, the microcontroller unit (MCU) controls the shunt switch 50 to open.

[0108] In addition, continue to refer to Figure 1 and Figure 2As shown, the voltage conversion module 30 on each transmission circuit 20 is adapted to output a substantially consistent voltage, which means that the voltage conversion module 30 on each transmission circuit 20 outputs the same consistent voltage.

[0109] In this way, when multiple battery packs are connected to the transmission circuit 20, the voltage output by the voltage conversion module 30 on each transmission circuit 20 can be kept balanced, effectively preventing reverse charging of the battery packs.

[0110] Reference Figure 3 As shown, the battery pack parallel circuit 100 also includes a power switch 60, which is located between the battery pack 10 and the voltage conversion module 30. The power switch 60 is also controlled by a microcontroller unit (MCU) to selectively open or close.

[0111] Specifically, the battery pack 10 is connected to the microcontroller unit (MCU). When the battery pack 10 is connected to the corresponding transmission circuit 20 and communication is successfully established, the microcontroller unit (MCU) controls the power switch 60 on the corresponding transmission circuit 20 to close. Otherwise, the power switch remains open. In addition, when the microcontroller unit (MCU) detects an abnormality in the battery pack 10 or receives abnormal information from the battery pack 10, such as when the discharge cutoff voltage is lower than a preset threshold, the microcontroller unit (MCU) controls the power switch 60 on the corresponding transmission circuit 20 to open.

[0112] Thus, when the battery pack 10 is not connected to the transmission circuit 20 or when the information of the battery pack 10 is abnormal, such as when the discharge cut-off voltage is lower than the preset threshold, the microcontroller controls the power switch 60 to disconnect.

[0113] In addition, as described above, the shunt switch 50 is electrically connected to the microcontroller unit (MCU) and is also controlled by the MCU to selectively open or close.

[0114] In another feasible embodiment, specific reference is made. Figure 4 and Figure 5 As shown, the battery pack 10 includes a built-in discharge switch 102 and a BMS protection board 101. When the information of the battery pack 10 is abnormal, such as when the discharge cut-off voltage is lower than a preset threshold, the BMS protection board 101 controls the discharge switch 102 to open. In this way, the battery pack will have its own protection function. When the information of the battery pack 10 itself is abnormal, the BMS protection board 101 will cut off the output of the battery pack 10 by opening the discharge switch 102. In particular, when the discharge cut-off voltage of the battery pack 10 is lower than the preset threshold, the BMS protection board 101 controls the discharge switch 102 to open to avoid over-discharge.

[0115] At this point, a power switch 60 can be further configured on the transmission circuit. When the BMS protection board 101 of the battery pack 10 controls the discharge switch 102 to open, the microcontroller unit (MCU) simultaneously controls the power switch 60 to open, forming multiple protections for the battery pack parallel circuit 100.

[0116] Furthermore, the voltage conversion module 30 is a DC / DC module, and more preferably, the DC / DC module is a bidirectional DC / DC module, so that the battery pack 10 can also be reverse charged through the bidirectional DC / DC module.

[0117] In another specific embodiment, please refer to the following: Figure 6 As shown, the battery pack parallel circuit 100 includes:

[0118] N battery packs of 10, each suitable for outputting direct current, where N>2;

[0119] A transmission circuit 20 is provided in a one-to-one correspondence with the battery pack 10;

[0120] Each transmission circuit 20 is equipped with a voltage conversion module 30;

[0121] Battery packs 10 are electrically connected to DC bus 40 via their corresponding voltage conversion modules 30; wherein...

[0122] Each transmission circuit 20 has a connection node N between the output of the battery pack 10 and the input of the voltage conversion module 30.

[0123] A shunt switch 50 is provided between the connection nodes N. When a certain transmission circuit 20 is detected to be disconnected, a preset control logic controls one of the shunt switches 50 connected to the connection node N on the disconnected transmission circuit 20 to open and the other to close, and all other shunt switches 50 to open.

[0124] A transmission circuit 20 is connected to a closed shunt switch 50. The DC power output from the corresponding battery pack 10 is shunted by the closed shunt switch 50. One path flows through the voltage conversion module 30 on the original transmission circuit 20 to the DC bus 40, and the other path flows through the closed shunt switch 50 through the open voltage conversion module 30 on the transmission circuit 20 to the DC bus 40.

[0125] The aforementioned preset control logic includes:

[0126] Compare the voltage levels of the battery pack 10 on the transmission circuit 20 connected to the other end of the shunt switch 50 on both sides of node N.

[0127] The shunt switch 50 connected to the side of the battery pack 10 with higher voltage is closed, and the shunt switch 50 connected to the side of the battery pack 10 with lower voltage is open.

[0128] Reference Figure 7 As shown, a battery pack parallel operation circuit 100 with three battery packs 10 is specifically used as an example. The battery pack parallel operation circuit 100 includes:

[0129] A first battery pack 10a, a corresponding first transmission circuit 20a and a first voltage conversion module 30a;

[0130] The second battery pack 10b, the corresponding second transmission circuit 20b, and the second voltage conversion module 30b;

[0131] The third battery pack 10b, the corresponding third transmission circuit 20c and the third voltage conversion module 30c;

[0132] Each battery pack is electrically connected to the DC bus 40 via its corresponding voltage conversion module; wherein,

[0133] The first transmission circuit 20a has a first connection node N1 configured between the output of the first battery pack 10a and the input of the first voltage conversion module 30a;

[0134] The second transmission circuit 20b is configured 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;

[0135] The third transmission circuit 20c has a third connection node N3 configured between the output of the third battery pack 10c and the input of the third voltage conversion module 30c;

[0136] A first shunt switch 50a is provided between the first connecting node N1 and the second connecting node N2, a second shunt switch 50b is provided between the second connecting node N2 and the third connecting node N3, and a third shunt switch 50c is provided between the third connecting node N3 and the first connecting node N1.

[0137] When the first transmission circuit 20a is detected to be disconnected, a preset control logic controls the shunt switches connected to both 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 disconnected and the other is closed, and the second shunt switch 50b is disconnected.

[0138] The second transmission circuit 20b or the third transmission circuit 20c is connected to the closed shunt switch. The DC power output from the corresponding second battery pack 10b or third battery pack 10c is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus 40, and the other path flows through the closed shunt switch through the voltage conversion module on the open transmission circuit to the DC bus 40.

[0139] Specifically, taking the preset logic control of the third shunt switch 50c being open, the first shunt switch 50a being closed, and the second shunt switch 50b being open as an example, at this time, the second transmission circuit 20b is connected to the closed shunt switch, and the DC power output from the corresponding second battery pack 10b is shunted through the closed first shunt switch 50a. One path flows through the original transmission circuit, that is, the second voltage conversion module 30b on the second transmission circuit 20b to the DC bus 40, and the other path flows through the closed first shunt switch 50a through the open transmission circuit, that is, the first voltage conversion module 30a on the first transmission circuit 20a to the DC bus 40. Meanwhile, the third battery pack 10c on the third transmission circuit 20c flows to the DC bus 40 through its corresponding third voltage conversion module 30ca.

[0140] Furthermore, continue to refer to Figure 7 As shown, the shunt switches on both sides of the first connection node N1 are the first shunt switch 50a and the 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.

[0141] In the aforementioned preset control logic, the voltage levels of the battery pack 10 connected to the transmission circuit 20 on the other end of the shunt switch on both sides of the first connection node N1 will be compared, that is, the voltage levels of the second battery pack 10b and the third battery pack 10c will be compared.

[0142] If the voltage of the second battery pack 10b is set to be higher than the voltage of the third battery pack 10c, then the first shunt switch 50a connected to the second battery pack 10b is closed, the third shunt switch 50c is open, and the remaining second shunt switches 50b are open. At this time, the second transmission circuit 20b is connected to the closed first shunt switch 50a. The DC power output from the corresponding second battery pack 10b is shunted through the closed first shunt switch 50a. One path flows through the original transmission circuit, that is, the second voltage conversion module 30b on the second transmission circuit 20b to the DC bus 40. The other path flows through the closed first shunt switch 50a through the open transmission circuit, that is, the first voltage conversion module 30a on the first transmission circuit 20a to the DC bus 40. Meanwhile, the third battery pack 10c on the third transmission circuit 20c flows to the DC bus 40 through its corresponding third voltage conversion module 30ca.

[0143] Additionally, refer to Figure 8As shown, when only one transmission circuit 20 is detected to be conducting, the shunt switches 50 on both sides of the connection node N on the conducting transmission circuit 20 are closed, and the remaining shunt switches are open. The DC power output from the corresponding battery pack 10 is shunted through the closed shunt switch 50. One path flows through the voltage conversion module 30 on the original transmission circuit 20 to the DC bus 40, and the other two paths flow through the closed shunt switch 50 through the voltage conversion module 30 on the open transmission circuit 20 to the DC bus 40.

[0144] Specifically, with only the second transmission circuit 20b corresponding to the second battery pack 10b being 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 closed, and the third shunt switch 50c is open. The DC power output from the second battery pack 10b flows through the second voltage conversion module 30b on the original second transmission circuit 20b to the DC bus 40, and the other two flows through the closed first shunt switch 50a and the second shunt switch 50b respectively through the voltage conversion modules on the open first transmission circuit 20a and the third transmission circuit 20c to the DC bus 40.

[0145] In addition, this utility model also relates to an energy storage device 200, as detailed in the following reference. Figure 9 and Figure 10 As shown, the energy storage device 200 includes:

[0146] Such as the battery pack parallel circuit 100 mentioned above;

[0147] DC / AC module 200a, which is electrically connected to DC bus 40, is suitable for converting the DC power output from DC bus 40 into AC power.

[0148] Furthermore, the DC / AC module 200a is a bidirectional DC / AC module 200a.

[0149] Furthermore, it also includes:

[0150] The connection port 200b is configured to correspond one-to-one with the battery pack 10, and is suitable for mechanical and electrical connection to the battery pack 10, and is detachably connected to the battery pack 10.

[0151] Furthermore, when any one of the battery packs 10 is connected to the connection port 200b, it is adapted to supply power to the first power device through the battery pack parallel circuit 100 and the DC / AC module 200a; when any one of the battery packs 10 is removed from the connection port 200b, the battery pack 10 is also adapted to supply power to the second power device.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An energy storage device, characterized in that, include: Multiple battery packs, suitable for outputting direct current; Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack; DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power. When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes: Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs; Each of the aforementioned transmission circuits is equipped with a voltage conversion module; Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module; wherein, A shunt switch is also provided between the transmission circuits. When one of the transmission circuits is disconnected, the shunt switch connected to the disconnected transmission circuit closes. The DC power output from the battery pack on the other transmission circuit connected to the closed shunt switch is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

2. The energy storage device according to claim 1, characterized in that: The output of the battery pack corresponding to a single transmission circuit is adapted to be shunt via the closed shunt switch to meet the maximum power output of multiple transmission circuits or the maximum power output of the battery pack itself.

3. The energy storage device according to claim 1 or 2, characterized in that: It also includes a microcontroller unit adapted to control the shunt switch to selectively open or close.

4. The energy storage device according to claim 3, characterized in that: The shunt switch is a normally open switch.

5. The energy storage device according to claim 4, characterized in that: When all the transmission circuits are on, the shunt switch remains off.

6. The energy storage device according to claim 1, characterized in that: The voltage conversion module on each of the transmission circuits is adapted to output a consistent voltage or voltages that differ by less than 0.1V.

7. The energy storage device according to claim 1, characterized in that: It also includes a power switch, which is located between the battery pack and the voltage conversion module.

8. The energy storage device according to claim 7, characterized in that: The shunt switch and the power switch are respectively controlled by the microcontroller unit to selectively open or close.

9. The energy storage device according to claim 8, characterized in that: When the battery pack is not connected to the transmission circuit or when the battery pack discharge cutoff voltage is lower than a preset threshold, the microcontroller controls the power switch to turn off.

10. The energy storage device according to claim 1, 7, 8, or 9, characterized in that: The battery pack includes a built-in discharge switch and a BMS protection board. When the discharge cutoff voltage of the battery pack is lower than a preset threshold, the BMS protection board controls the discharge switch to open.

11. The energy storage device according to claim 1, characterized in that: The voltage conversion module is a DC / DC module or a bidirectional DC / DC module.

12. An energy storage device, characterized in that, include: Multiple battery packs, suitable for outputting direct current; Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack; DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power. When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes: Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs; Each of the aforementioned transmission circuits is equipped with a voltage conversion module; Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module; A shunt switch is also provided between the transmission circuits; wherein... The battery pack parallel circuit includes at least a first output mode and a second output mode: The first output mode is that when each of the transmission circuits is turned on, the shunt switch is turned off, and the battery pack corresponding to each of the transmission circuits is electrically connected to the DC bus through the corresponding voltage conversion module. In the second output mode, when one of the transmission circuits is disconnected, a shunt switch connected to the disconnected transmission circuit is closed, and the DC power output from the battery pack on the other transmission circuit is shunted by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

13. An energy storage device, characterized in that, include: There are N battery packs, each of which is suitable for outputting direct current, where N>2; Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack; DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power. When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes: A transmission circuit is provided that corresponds one-to-one with each of the battery packs; Each of the aforementioned transmission circuits is equipped with a voltage conversion module; The battery packs are each electrically connected to the DC bus via their corresponding voltage conversion modules; wherein... Each of the aforementioned transmission circuits is configured with a connection node between the output of the battery pack and the input of the voltage conversion module. A shunt switch is provided between the connection nodes. When a certain transmission circuit is disconnected, a preset control logic controls one of the shunt switches on both sides of the connection node on the disconnected transmission circuit to open, the other to close, and the remaining shunt switches to open. The transmission circuit is connected to the closed shunt switch. The DC power output by the corresponding battery pack is split by the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the open transmission circuit to the DC bus.

14. The energy storage device according to claim 13, characterized in that: When it is detected that only one of the transmission circuits is conducting, the shunt switches on both sides of the connection node on the conducting transmission circuit are closed. The DC power output from the corresponding battery pack is shunted through the closed shunt switches. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, while the other two paths flow through the closed shunt switches through the voltage conversion module on the disconnected transmission circuit to the DC bus.

15. An energy storage device, characterized in that, include: Multiple battery packs, suitable for outputting direct current; Connection ports are provided one-to-one with the battery pack, suitable for mechanical and electrical connection to the battery pack, and detachably connected to the battery pack; DC / AC module, which is electrically connected to the DC bus, is suitable for inverting the DC power output from the DC bus to AC power. When any of the battery packs is connected to the connection port, it is adapted to supply power to a first power device through the battery pack parallel circuit and the DC / AC module; when any of the battery packs is detached and removed from the connection port, the battery pack is also adapted to supply power to a second power device; wherein, the battery pack parallel circuit includes: Multiple transmission circuits are configured to correspond one-to-one with each of the aforementioned battery packs; Each of the aforementioned transmission circuits is equipped with a voltage conversion module; Each of the battery packs is electrically connected to the DC bus via its corresponding voltage conversion module; 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 to a first shunt switch and a second shunt switch; The other end of the first shunt switch is connected to the first transmission circuit; The other end of the second shunt switch is connected to the second transmission circuit; When the transmission circuit configured with the first node is detected to be disconnected, a preset control logic controls one of the first shunt switch and the second shunt switch to open and the other to close. The DC power output by the battery pack on the first transmission circuit or the second transmission circuit is shunted through the closed shunt switch. One path flows through the voltage conversion module on the original transmission circuit to the DC bus, and the other path flows through the closed shunt switch through the voltage conversion module on the disconnected transmission circuit to the DC bus.

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