Direct current charging and discharging power supply management system

Abstract

The invention discloses a direct-current charging and discharging power supply management system, which comprises a charging device, a discharging device, a plurality of storage battery packs and a direct-current charging and discharging channel conversion device, the DC charging and discharging channel conversion device comprises a main power supply conversion module, a signal control module and an electrical interlocking module. The main power supply conversion module is connected with the charging device, the discharging device and the plurality of first storage battery packs to form a DC1000V main electric energy distribution network; the signal control module is in communication connection with a general control unit and an electrical interlocking module of the power management system so as to send a control signal from the general control unit to the electrical interlocking module; and the electrical interlocking module is in communication connection with the main power supply conversion module so as to perform electrical interlocking control on the main power supply conversion module through the preset logic signal and the received control signal. According to the invention, flexible and accurate distribution and reliable protection of electric energy and signals among multiple groups of storage batteries, charging devices and discharging devices can be realized.

Description

Technical Field

[0001] This invention relates to the field of marine power system technology, and in particular to a DC charging and discharging power supply management system. Background Technology

[0002] In DC power systems of large platforms such as ships, multiple sets of batteries, charging devices, and discharging devices are typically configured to ensure a continuous and reliable power supply. Traditional DC charging and discharging systems are relatively simple in design, often employing a fixed "one-to-one" or "one-to-two" connection mode, where one set of charging equipment corresponds to one or two sets of battery banks to form a circuit. In this type of design, the connection between the charging equipment and the batteries is basically limited to charging and discharging power signals.

[0003] As system complexity increases, and the number of battery packs grows, with charging and discharging devices interacting with the battery packs not only through main power connections but also through the exchange of control and communication signals, traditional designs reveal significant shortcomings. Continuing with the old approach requires configuring a complete set of equipment for each charging and discharging circuit, resulting in high system costs, enormous space requirements, and complex wiring. More importantly, traditional solutions cannot achieve flexible, precise, and synchronous switching of power, control signals, and communication signals among the complex multiple battery packs, charging devices, and discharging devices, failing to meet the high reliability, maintainability, and flexibility requirements of modern shipboard electrical systems.

[0004] Therefore, there is an urgent need for an integrated solution to overcome the aforementioned technical shortcomings.

[0005] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a DC charging and discharging power management system that can achieve flexible, accurate distribution and reliable protection of electrical energy and signals among multiple sets of batteries, a single charging device, and a single discharging device.

[0007] To achieve the above objectives, the present invention provides a DC charging and discharging power supply management system, comprising: The system includes a charging device, a discharging device, multiple battery packs, and a DC charge / discharge channel conversion device, wherein the DC charge / discharge channel conversion device is electrically connected between the charging device, the discharging device, and the multiple battery packs to form a charging / discharging circuit. The DC charging and discharging channel conversion device includes: a main power conversion module, a signal control module, and an electrical interlocking module; The main power conversion module, after being connected to the charging device, the discharging device and multiple first battery packs, forms a DC1000V main power distribution network. The signal control module is communicatively connected to the main control unit and the electrical interlocking module of the power management system, so as to send the control signal from the main control unit to the electrical interlocking module; The electrical interlocking module is built based on a PLC controller. The electrical interlocking module is communicatively connected to the main power conversion module to perform electrical interlocking control on the main power conversion module through preset logic signals and received control signals. The main power conversion module includes: The system includes a main power connection line, a first charging channel circuit breaker, a first discharging channel circuit breaker, and multiple first battery channel circuit breakers corresponding to the number of first battery packs. The first charging channel circuit breaker is connected between the main power connection line and the charging device to control the electrical transmission of the main charging circuit. The first discharging channel circuit breaker is connected between the main power connection line and the discharging device to control the electrical transmission of the main discharging circuit. Each first battery channel circuit breaker is connected between the main power connection line and each first battery pack to control each main power supply branch.

[0008] Optionally, the main power conversion module is further provided with: a main circuit isolation channel circuit breaker; The main circuit isolation channel circuit breaker is installed on the main power connection line and is located between the first charging channel circuit breaker and the first discharging channel circuit breaker to provide electrical isolation control for the main charging and discharging circuit. Multiple first battery packs are connected to both ends of the main circuit isolation channel circuit breaker via the main power connection line. When the main circuit isolation channel circuit breaker is opened, a portion of the first battery packs are connected to the discharge device via the first discharge channel circuit breaker, and another portion of the first battery packs are connected to the charging device via the first charging channel circuit breaker.

[0009] Optionally, a first fuse is provided between each of the first battery channel circuit breakers and the main power connection line to provide ultimate short-circuit protection and fault isolation for the main power supply branch.

[0010] Optionally, the DC charging and discharging channel conversion device further includes an auxiliary power conversion module, which, after being connected to the charging device, the discharging device and multiple second battery packs, forms a DC300V auxiliary power distribution network. The auxiliary power conversion module includes: Auxiliary power connection line, second charging channel circuit breaker, second discharging channel circuit breaker, auxiliary circuit isolation channel circuit breaker, and multiple second battery channel circuit breakers corresponding to the number of second battery packs; The second charging channel circuit breaker is connected between the auxiliary power connection line and the charging device to control the electrical transmission of the auxiliary charging circuit; the second discharging channel circuit breaker is connected between the auxiliary power connection line and the discharging device to control the electrical transmission of the auxiliary discharging circuit; each second battery channel circuit breaker is connected between the auxiliary power connection line and each second battery pack to control each auxiliary power supply branch respectively; the auxiliary circuit isolation channel circuit breaker is installed on the auxiliary power connection line and located between the second charging channel circuit breaker and the second discharging channel circuit breaker to provide electrical isolation control for the auxiliary charging and discharging circuits; multiple second battery packs are connected to both ends of the auxiliary circuit isolation channel circuit breaker through the auxiliary power connection line. When the auxiliary circuit isolation channel circuit breaker is open, a portion of the second battery packs are connected to the discharging device through the second discharging channel circuit breaker, and another portion of the second battery packs are connected to the charging device through the second charging channel circuit breaker.

[0011] Optionally, the electrical interlocking module is communicatively connected to the first charging channel circuit breaker, the first discharging channel circuit breaker, the main circuit isolation channel circuit breaker, and each of the first battery channel circuit breakers, as well as the second charging channel circuit breaker, the second discharging channel circuit breaker, the auxiliary circuit isolation channel circuit breaker, and each of the second battery channel circuit breakers, so as to synchronously send closing or opening signals to each channel circuit breaker, thereby performing electrical interlocking control on each channel circuit breaker.

[0012] Optionally, the electrical interlocking module is configured as follows: When the electrical interlocking module simultaneously sends a first closing signal to both the main circuit isolation channel circuit breaker and the auxiliary circuit isolation channel circuit breaker, the electrical interlocking module sends a closing signal to one of the charging circuits or the discharging circuit, and simultaneously sends a disconnecting signal to the other; that is, it sends a second closing signal only to the first and second charging channel circuit breakers in the charging circuit, and simultaneously sends a first disconnecting signal to the first and second discharging channel circuit breakers in the discharging circuit; or it sends a third closing signal to the first and second discharging channel circuit breakers in the discharging circuit, and simultaneously sends a second disconnecting signal to the first and second charging channel circuit breakers in the charging circuit.

[0013] Optionally, the electrical interlocking module is further configured to: When the electrical interlocking module simultaneously sends a third tripping signal to both the main circuit isolation channel circuit breaker and the auxiliary circuit isolation channel circuit breaker, the electrical interlocking module simultaneously sends a closing signal to both the charging circuit and the discharging circuit. That is, it simultaneously sends a fourth closing signal to the first charging channel circuit breaker and the second charging channel circuit breaker in the charging circuit, and a fifth closing signal to the first discharging channel circuit breaker and the second discharging channel circuit breaker in the discharging circuit.

[0014] Optionally, when the electrical interlocking module simultaneously sends the first closing signal to the main circuit isolation channel circuit breaker and the auxiliary circuit isolation channel circuit breaker, the electrical interlocking module sends a fourth closing signal to any one of the first battery channel circuit breakers and a seventh closing signal to any one of the second battery channel circuit breakers.

[0015] Optionally, when the electrical interlocking module simultaneously sends a third tripping signal to both the main circuit isolation channel circuit breaker and the auxiliary circuit isolation channel circuit breaker, the electrical interlocking module sends an eighth, ninth, tenth, and eleventh closing signal to any one of the first battery channel circuit breakers connected to the first discharge channel circuit breaker, any one of the first battery channel circuit breakers connected to the first charging channel circuit breaker, any one of the second battery channel circuit breakers connected to the second discharge channel circuit breaker, and any one of the second battery channel circuit breakers connected to the second charging channel circuit breaker, respectively.

[0016] Optionally, the signal control module integrates a control signal relay and a communication repeater; The control signal relay is communicatively connected to the main control unit of the power management system to receive control signals; the communication repeater is communicatively connected to the electrical interlocking module and the control signal relay to send the control signals to the electrical interlocking module.

[0017] In summary, compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a DC charging and discharging power management system, which realizes flexible connection between multiple sets of batteries and a single set of charging and discharging equipment through a channel conversion device, greatly reducing the number of redundant configurations of charging and discharging devices, and significantly reducing system cost and installation space occupation.

[0018] 2. The DC charging and discharging power supply management system provided by this invention ensures absolute synchronization and consistency of the paths of the main power supply, auxiliary power supply, control signal and communication signal during switching through innovative linkage control logic and signal following logic. This fundamentally avoids control failure or communication interruption caused by mismatch between signal and power paths, and ensures the reliability of system operation.

[0019] 3. The DC charging and discharging power supply management system provided by this invention has multiple built-in electrical interlocks and software logic control, which strictly limit the establishment of only one complete charging or discharging path at the same time, effectively preventing misoperation and system short circuit risks; in addition, the main circuit is equipped with an isolating switch, which provides a special parallel charging and discharging working mode, enhancing the system's ability to cope with complex working conditions. Attached Figure Description

[0020] Figure 1 This is a system block diagram of the channel conversion device of the present invention; Figure 2 This is a schematic diagram of the DC1000V main power distribution network of the present invention; Figure 3 This is a schematic diagram of the DC300V auxiliary power distribution network of the present invention; Figure 4 This is a schematic diagram of interlocking in one embodiment of the present invention; Figure 5 This is a schematic diagram of interlocking in another embodiment of the present invention. Detailed Implementation

[0021] The following will be combined with the appendix Figures 1-5 The present invention will be further described in detail through preferred embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of the present invention. Please refer to the accompanying drawings to make the objectives, features, and advantages of the present invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives achieved by the present invention, should still fall within the scope of the technical content disclosed in the present invention.

[0022] like Figure 1 As shown, this invention provides a DC charging and discharging power management system, including a charging device 500, a discharging device 600, multiple battery packs 400, and a DC charging and discharging channel conversion device. The DC charging and discharging channel conversion device is electrically connected between the charging device 500, the discharging device 600, and the multiple battery packs 400 to form a charging and discharging circuit. The DC charging and discharging channel conversion device includes: a main power conversion module 100, an auxiliary power conversion module 200, a signal control module 300, and an electrical interlocking module (not shown in the figure).

[0023] In a specific embodiment of the present invention, both the main power conversion module 100 and the auxiliary power conversion module 200 are connected to a portion of the battery pack 400; specifically, the main power conversion module 100 is connected to a plurality of first battery packs 401 in the battery pack 400, and the auxiliary power conversion module 200 is connected to a plurality of second battery packs 402 in the battery pack 400.

[0024] The main power conversion module 100, after being connected to the charging device 500, the discharging device 600 and the plurality of first battery packs 401, forms a DC 1000V main power distribution network.

[0025] Furthermore, such as Figure 2 As shown, the main power conversion module 100 includes: a main power connection line, a first charging channel circuit breaker 510, a first discharging channel circuit breaker 610, a main circuit isolation channel circuit breaker 710, and a plurality of first battery channel circuit breakers 410 corresponding to the number of first battery packs 401; the first charging channel circuit breaker 510 is connected between the main power connection line and the charging device 500 to control the electrical transmission of the main charging circuit; the first discharging channel circuit breaker 610 is connected between the main power connection line and the discharging device 600 to control the electrical transmission of the main discharging circuit; each first battery channel circuit breaker 410 is connected between the main power connection line and each first battery pack 401 to control each main power supply branch respectively; the main circuit isolation channel circuit breaker 710 is disposed on the main power connection line, located between the first charging channel circuit breaker 510 and the first discharging channel circuit breaker 610, to provide electrical isolation control for the main charging and discharging circuits. Specifically, multiple first battery packs 401 are connected to both ends of the main circuit isolation channel circuit breaker 710 via main power connection lines. Therefore, when the main circuit isolation channel circuit breaker 710 is disconnected, a portion of the first battery packs 401 are connected to the discharge device 600 via the first discharge channel circuit breaker 610, and another portion of the first battery packs 401 are connected to the charging device 500 via the first charging channel circuit breaker 510. After the main power conversion module 100 is connected to the charging device 500, the discharge device 600, and the multiple first battery packs 401 respectively, a configuration is formed as follows: Figure 2 The DC1000V main power distribution network shown.

[0026] Furthermore, a first fuse is provided between each of the first battery channel circuit breakers 410 and the main power connection line to provide ultimate short-circuit protection and fault isolation for the main power supply branch.

[0027] The auxiliary power conversion module 200, after being connected to the charging device 500, the discharging device 600 and the plurality of second battery packs 402, forms a DC300V auxiliary power distribution network.

[0028] Furthermore, such as Figure 3As shown, the auxiliary power conversion module 200 includes: an auxiliary power connection line, a second charging channel circuit breaker 520, a second discharging channel circuit breaker 620, an auxiliary circuit isolation channel circuit breaker 720, and a plurality of second battery channel circuit breakers 420 corresponding to the number of second battery packs 402; the second charging channel circuit breaker 520 is connected between the auxiliary power connection line and the charging device 500 to control the electrical transmission of the auxiliary charging circuit; the second discharging channel circuit breaker 620 is connected between the auxiliary power connection line and the discharging device 600 to control the electrical transmission of the auxiliary discharging circuit; each second battery channel circuit breaker 420 is connected between the auxiliary power connection line and each second battery pack 402 to control each auxiliary power supply branch respectively; the auxiliary circuit isolation channel circuit breaker 720 is disposed on the auxiliary power connection line and located between the second charging channel circuit breaker 520 and the second discharging channel circuit breaker 620 to provide electrical isolation control for the auxiliary charging and discharging circuits. Specifically, multiple second battery packs 402 are connected to both ends of the auxiliary circuit isolation channel circuit breaker 720 via auxiliary power connection lines. Therefore, when the auxiliary circuit isolation channel circuit breaker 720 is disconnected, a portion of the second battery packs 402 are connected to the discharge device 600 via the second discharge channel circuit breaker 620, and another portion of the second battery packs 402 are connected to the charging device 500 via the second charging channel circuit breaker 520. After the aforementioned auxiliary power conversion module 200 is connected to the charging device 500, the discharge device 600, and the multiple second battery packs 402 respectively, a configuration is formed as follows: Figure 3 The DC300V auxiliary power distribution network shown.

[0029] The signal control module 300 is integrated with a control signal relay 310 and a communication repeater 320. The control signal relay 310 is communicatively connected to the main control unit of the power management system to receive control signals. The communication repeater 320 is communicatively connected to both the electrical interlocking module and the control signal relay 310 to send the control signals to the electrical interlocking module.

[0030] The electrical interlocking module is built based on a PLC controller (programmable controller). The electrical interlocking module is communicatively connected to the main power conversion module 100 and the auxiliary power conversion module 200 respectively. Through preset logic signals and received control signals, the main power conversion module 100 and the auxiliary power conversion module 200 are electrically interlocked to ensure that only one charging circuit (including the main charging circuit and the auxiliary charging circuit) or one discharging circuit (including the main discharging circuit and the auxiliary discharging circuit) can be connected at the same time in the same electrical connection path.

[0031] Specifically, the electrical interlocking module is communicatively connected to the first charging channel circuit breaker 510, the first discharging channel circuit breaker 610, the main circuit isolation channel circuit breaker 710, and each of the first battery channel circuit breakers 410, as well as the second charging channel circuit breaker 520, the second discharging channel circuit breaker 620, the auxiliary circuit isolation channel circuit breaker 720, and each of the second battery channel circuit breakers 420, so as to synchronously send closing or opening signals to each channel circuit breaker, thereby performing electrical interlocking control on each channel circuit breaker.

[0032] The electrical interlocking module is configured such that when it simultaneously sends a first closing signal to both the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, it sends a closing signal to one of the charging or discharging circuits and a closing signal to the other; that is, it sends a second closing signal only to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520 in the charging circuit, and simultaneously sends a first closing signal to the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620 in the discharging circuit; or it sends a third closing signal to the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620 in the discharging circuit, and simultaneously sends a second closing signal to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520 in the charging circuit.

[0033] When the electrical interlocking module simultaneously sends a third tripping signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module simultaneously sends a closing signal to the charging circuit and the discharging circuit, that is, simultaneously sends a fourth closing signal to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520 in the charging circuit, and sends a fifth closing signal to the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620 in the discharging circuit.

[0034] Furthermore, when the electrical interlocking module simultaneously sends a first closing signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module sends a sixth closing signal to any one of the first battery channel circuit breakers 410 and a seventh closing signal to any one of the second battery channel circuit breakers 420; when the electrical interlocking module simultaneously sends a third tripping signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module sends an eighth, ninth, tenth, and eleventh closing signal respectively to any one of the first battery channel circuit breakers 410 connected to the first discharge channel circuit breaker 610, any one of the first battery channel circuit breakers 410 connected to the first charging channel circuit breaker 510, any one of the second battery channel circuit breakers 420 connected to the second discharge channel circuit breaker 620, and any one of the second battery channel circuit breakers 420 connected to the second charging channel circuit breaker 520.

[0035] Specifically, the following three examples illustrate in detail how the electrical interlocking module functions.

[0036] In the first embodiment of the present invention: like Figure 4 As shown, when the electrical interlocking module sends a first closing signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module also sends a second closing signal to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520. The first charging channel circuit breaker 510 and the second charging channel circuit breaker 520 are closed, and the main and auxiliary charging circuits are connected. At the same time, the electrical interlocking module sends a first opening signal to the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620. The first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620 are opened, and the main and auxiliary discharging circuits are not connected. That is, the electrical interlocking module is configured to only allow the second closing signal to be sent to the first charging channel circuit breaker 510 in the main charging circuit and the second charging channel circuit breaker 520 in the auxiliary charging circuit simultaneously.

[0037] Furthermore, the electrical interlocking module sends a fourth closing signal to any one of the first battery channel circuit breakers 410 and a fifth closing signal to any one of the second battery channel circuit breakers 420 to control the charging device 500 to charge the battery pack 400 connected to the charging circuit through the main and auxiliary charging circuits.

[0038] In the second embodiment of the present invention: like Figure 4As shown, when the electrical interlocking module sends a first closing signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module also sends a third closing signal to the first discharge channel circuit breaker 610 and the second discharge channel circuit breaker 620. The first discharge channel circuit breaker 610 and the second discharge channel circuit breaker 620 are closed, and the main and auxiliary discharge circuits are connected. At the same time, the electrical interlocking module sends a second disconnecting signal to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520. The first charging channel circuit breaker 510 and the second charging channel circuit breaker 520 are opened, and the main and auxiliary charging circuits are not connected. That is, the electrical interlocking module is configured to only allow the third closing signal to be sent to the first discharge channel circuit breaker 610 in the main discharge circuit and the second discharge channel circuit breaker 620 in the auxiliary discharge circuit simultaneously.

[0039] Furthermore, the electrical interlocking module sends a fourth closing signal to any one of the first battery channel circuit breakers 410 and a fifth closing signal to any one of the second battery channel circuit breakers 420 to control the battery pack 400 connected to the discharge circuit to supply power to the discharge device 600 through the main and auxiliary discharge circuits.

[0040] In the third embodiment of the present invention: like Figure 5 As shown, when the electrical interlocking module sends a third tripping signal to the main circuit isolation channel circuit breaker 710 and the auxiliary circuit isolation channel circuit breaker 720, the electrical interlocking module simultaneously sends a fourth closing signal to the first charging channel circuit breaker 510 and the second charging channel circuit breaker 520, and sends a fifth closing signal to the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620. The first charging channel circuit breaker 510, the second charging channel circuit breaker 520, the first discharging channel circuit breaker 610 and the second discharging channel circuit breaker 620 are all closed, and the main and auxiliary charging circuits, as well as the main and auxiliary discharging circuits, are all connected.

[0041] Furthermore, the electrical interlocking module sends an eighth closing signal to any of the first battery channel circuit breakers 410 connected to the first discharge channel circuit breaker 610, sends a tenth closing signal to any of the second battery channel circuit breakers 420 connected to the second discharge channel circuit breaker 620, sends a ninth closing signal to the first battery channel circuit breaker 410 connected to the first charging channel circuit breaker 510, and sends an eleventh closing signal to the second battery channel circuit breaker 420 connected to the second charging channel circuit breaker 520, so that the main charging circuit, auxiliary charging circuit, main discharge circuit, and auxiliary discharge circuit each operate independently in multiple electrical connection paths.

[0042] In summary, the DC charging and discharging power management system provided by this invention can realize flexible, accurate distribution and reliable protection of electrical energy and signals among multiple sets of batteries, a single charging device, and a single discharging device.

[0043] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] In the description of this invention, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A direct current charge and discharge power management system, characterized by, The direct current charging and discharging channel conversion device is electrically connected between the charging device, the discharging device and the plurality of battery packs, and is used for forming a charging and discharging loop. The main power conversion module is connected to the charging device, the discharging device and the plurality of first battery packs, and forms a DC 1000V main electric energy distribution network. The signal control module and the electrical interlocking module are both in communication connection with the general control unit of the power management system, so as to send the control signal from the general control unit to the electrical interlocking module. The electrical interlocking module is based on a PLC controller, and is in communication connection with the main power conversion module, so as to perform electrical interlocking control on the main power conversion module through a preset logic signal and a received control signal. The main power conversion module comprises: The main electric energy connection line, the first charging channel breaker, the first discharging channel breaker and a plurality of first battery pack channel breakers corresponding in number to the number of the first battery packs; the first charging channel breaker is connected between the main electric energy connection line and the charging device, so as to control the electric transmission of the main charging loop; the first discharging channel breaker is connected between the main electric energy connection line and the discharging device, so as to control the electric transmission of the main discharging loop; and each first battery pack channel breaker is connected between the main electric energy connection line and each first battery pack, so as to control each main battery supply branch respectively. The main power conversion module is further provided with a main loop isolation channel breaker.

2. The direct current charge and discharge power management system of claim 1, wherein, The main loop isolation channel breaker is arranged on the main electric energy connection line and located between the first charging channel breaker and the first discharging channel breaker, so as to perform electrical isolation control on the main charging and discharging loop. The plurality of first battery packs are connected to both ends of the main loop isolation channel breaker through the main electric energy connection line, and when the main loop isolation channel breaker is disconnected, a part of the first battery packs are connected to the discharging device through the first discharging channel breaker, and another part of the first battery packs are connected to the charging device through the first charging channel breaker. A first fuse is arranged between each first battery pack channel breaker and the main electric energy connection line, so as to provide limit short-circuit protection and fault isolation for the main battery supply branch.

3. The direct current charge and discharge power management system of claim 1, wherein, The direct current charging and discharging channel conversion device further comprises an auxiliary power conversion module, which is connected to the charging device, the discharging device and a plurality of second battery packs, and forms a DC 300V auxiliary electric energy distribution network.

4. The direct current charge and discharge power management system of claim 1, wherein, The auxiliary power conversion module comprises: An auxiliary electric energy connection line, a second charging channel breaker, a second discharging channel breaker, an auxiliary loop isolation channel breaker and a plurality of second battery pack channel breakers corresponding in number to the number of the second battery packs. ​ The second charging channel breaker is connected between the auxiliary power connection line and the charging device to control the electric transmission of the auxiliary charging circuit; the second discharging channel breaker is connected between the auxiliary power connection line and the discharging device to control the electric transmission of the auxiliary discharging circuit; each second battery channel breaker is connected between the auxiliary power connection line and each second battery pack to control each auxiliary battery supply circuit respectively; the auxiliary circuit isolation channel breaker is arranged on the auxiliary power connection line and located between the second charging channel breaker and the second discharging channel breaker to control the electrical isolation of the auxiliary charging and discharging circuit. A plurality of second battery packs are connected across the auxiliary circuit isolation channel breaker through the auxiliary power connection line, and when the auxiliary circuit isolation channel breaker is disconnected, a part of the second battery packs are connected to the discharging device through the second discharging channel breaker, and the other part of the second battery packs are connected to the charging device through the second charging channel breaker.

5. The direct current charging and discharging power management system of claim 4, wherein the electrical interlocking module is in communication connection with the first charging channel breaker, the first discharging channel breaker, the main circuit isolation channel breaker and each first battery channel breaker, and the second charging channel breaker, the second discharging channel breaker, the auxiliary circuit isolation channel breaker and each second battery channel breaker respectively, to synchronously send a closing or opening signal to each channel breaker respectively, and then to control the electrical interlocking of each channel breaker. The electrical interlocking module is configured to:

6. The direct current charge and discharge power management system of claim 5, wherein, When the electrical interlocking module simultaneously sends a first closing signal to the main circuit isolation channel breaker and the auxiliary circuit isolation channel breaker, the electrical interlocking module sends a closing signal to one of the charging circuit or the discharging circuit, and simultaneously sends an opening signal to the other; that is, only the first charging channel breaker and the second charging channel breaker in the charging circuit are sent a second closing signal, and the first discharging channel breaker and the second discharging channel breaker in the discharging circuit are sent a first opening signal; or the first discharging channel breaker and the second discharging channel breaker in the discharging circuit are sent a third closing signal, and the first charging channel breaker and the second charging channel breaker in the charging circuit are sent a second opening signal. The electrical interlocking module is further configured to:

7. The direct current charge and discharge power management system of claim 5, wherein, When the electrical interlocking module simultaneously sends a third opening signal to the main circuit isolation channel breaker and the auxiliary circuit isolation channel breaker, the electrical interlocking module simultaneously sends a closing signal to the charging circuit and the discharging circuit, that is, the first charging channel breaker and the second charging channel breaker in the charging circuit are sent a fourth closing signal, and the first discharging channel breaker and the second discharging channel breaker in the discharging circuit are sent a fifth closing signal. ​ 8. The direct current charge and discharge power management system of claim 6, wherein, When the electrical interlocking module sends the first close signal to the main circuit isolation passage circuit breaker and the auxiliary circuit isolation passage circuit breaker at the same time, the electrical interlocking module sends the fourth close signal to any one of the first battery passage circuit breakers and the seventh close signal to any one of the second battery passage circuit breakers.

9. The direct current charge and discharge power management system of claim 7, wherein, When the electrical interlocking module sends the third open signal to the main circuit isolation passage circuit breaker and the auxiliary circuit isolation passage circuit breaker at the same time, the electrical interlocking module sends the eighth, ninth, tenth and eleventh close signals to any one of the first battery passage circuit breakers connected to the first discharge passage circuit breaker, any one of the first battery passage circuit breakers connected to the first charge passage circuit breaker, any one of the second battery passage circuit breakers connected to the second discharge passage circuit breaker and any one of the second battery passage circuit breakers connected to the second charge passage circuit breaker, respectively.

10. The direct current charge and discharge power management system of claim 1, wherein, The signal control module is integrated by a control signal relay and a communication repeater; The control signal relay is in communication connection with the general control unit of the power management system to receive the control signal; the communication repeater is in communication connection with the electrical interlocking module and the control signal relay to send the control signal to the electrical interlocking module.

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