Conversion connection structure for energy storage DC / DC converter and energy storage system

Abstract

The application discloses a conversion connection structure for an energy storage DC / DC converter and an energy storage system, relates to the technical field of power electronics, and solves the problem of the contradiction between the wide voltage range and high efficiency of the existing conversion scheme. By setting a physical connection unit with a parallel and / or series topology structure, the same group of DC / DC converters can be adapted to energy storage converters of different voltage levels: the parallel mode is adapted to single-phase PCS of a low-voltage bus, and the series mode is adapted to three-phase PCS of a high-voltage bus, without the need to design high and low voltage DC / DC converters for different power grid types; each DC / DC converter can work at its rated output voltage point, without the need to expand the voltage range of a single module, and the parallel or series topology is physically realized by a fixed conductive structure at one time, the fixed conductive structure does not have switching action loss, and the overall system loss is reduced. The first interface group can also be connected with two or more DC / DC converters, and is suitable for more occasions.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a conversion connection structure and energy storage system for an energy storage DC / DC converter. Background Technology

[0002] DC / DC converters are widely used to convert one DC voltage to another. In energy storage applications, batteries are connected to a power conversion system (PCS) via a DC / DC converter, and the PCS is then connected to the power grid. Depending on the grid type, PCS are classified as single-phase or three-phase: single-phase PCS outputs a lower DC bus voltage, while three-phase PCS outputs a higher DC bus voltage.

[0003] In practical applications, to accommodate different bus voltages, it is usually necessary to design separate DC / DC converters for low input voltage and high input voltage. If a single DC / DC converter is used to accommodate both scenarios, its input voltage range will be too wide, leading to a significant decrease in efficiency and an increase in design complexity.

[0004] Therefore, providing a conversion scheme with a wide voltage range without reducing efficiency is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a conversion connection structure and energy storage system for an energy storage DC / DC converter, which solves the problem of the contradiction between the wide voltage range and high efficiency of existing conversion schemes.

[0006] To address the aforementioned technical problems, this application provides a conversion connection structure for an energy storage DC / DC converter, comprising: a physical connection unit and an energy storage converter; The physical connection unit includes: a first interface group for connecting the output terminals of at least two DC / DC converters, and a second interface for connecting the DC input terminal of an energy storage converter; and the first interface group and the second interface are connected by a fixed conductive structure. The fixed conductive structure is a parallel topology and / or a series topology; The parallel topology connects the positive output terminals and negative output terminals of each DC / DC converter to each other. The series topology is to connect two DC / DC converters end to end. When the number of DC / DC converters is greater than two, the series topology is to first connect every two DC / DC converters in series to form a series branch, and then connect each series branch in parallel.

[0007] Optionally, in the above-described conversion connection structure for energy storage DC / DC converters, the physical connection unit is integrated on the printed circuit board of the energy storage converter, and the fixed conductive structure is a copper foil trace or soldered jumper solidified in the printed circuit board layer.

[0008] Optionally, in the above-mentioned conversion connection structure for energy storage DC / DC converters, the physical connection unit is a metal busbar assembly or a terminal box, and the fixed conductive structure is the shaped conductor of the metal busbar assembly or the detachable jumper in the terminal box.

[0009] Optionally, in the above-described conversion connection structure for energy storage DC / DC converters, each of the DC / DC converters has the same rated output voltage and rated power rating.

[0010] Optionally, in the above-mentioned conversion connection structure for energy storage DC / DC converter, the housing of the physical connection unit is provided with a foolproof guide structure; The foolproof guiding structure is as follows: the fixed conductive structure is a parallel topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the single-phase grid-type energy storage converter; the fixed conductive structure is a series topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the three-phase grid-type energy storage converter.

[0011] Optionally, in the above-described conversion connection structure for energy storage DC / DC converters, when the physical connection unit includes a parallel topology and a series topology: The parallel topology and the series topology share the same second interface. The first interface group includes two sets of input terminals, corresponding to the parallel topology and the series topology, respectively.

[0012] Optionally, in the above-described conversion connection structure for energy storage DC / DC converters, the physical connection unit further includes: a fuse; The fuse is connected in series in the output circuit of the DC / DC converter.

[0013] Optionally, in the above-described conversion connection structure for energy storage DC / DC converters, the physical connection unit further includes: a filter capacitor; The filter capacitor is connected in parallel between the positive and negative terminals of the second interface.

[0014] Optionally, in the above-mentioned conversion connection structure for energy storage DC / DC converters, the outer shell of the physical connection unit is provided with an identification unit; The identification unit includes: Color-coded areas are used to distinguish parallel or series topologies by color. Textual markings are used to identify rated voltage, rated current, or topology type; Electronic tags are used to enable the host computer to automatically identify the topology type.

[0015] To address the aforementioned technical problems, this application also provides an energy storage system, comprising: an energy storage battery cluster, at least two DC / DC converters, and the aforementioned conversion connection structure for the energy storage DC / DC converters.

[0016] The conversion connection structure for energy storage DC / DC converters provided in this application, through the setting of physical connection units with parallel and / or series topologies, allows the same group of DC / DC converters to adapt to energy storage converters of different voltage levels: parallel mode adapts to single-phase PCS on low-voltage buses, and series mode adapts to three-phase PCS on high-voltage buses, eliminating the need to design separate high- and low-voltage DC / DC converters for different grid types. This allows each DC / DC converter to operate at its rated output voltage point without needing to extend the voltage range of a single module. Compared to the solution of using a wide-range DC / DC converter to accommodate two scenarios, which leads to a significant decrease in efficiency, each DC / DC converter in this application always operates at its optimal efficiency point, while the overall system efficiency is higher. In addition, the parallel or series topology is physically implemented in one step by a fixed conductive structure, without involving electronic switches such as relays, contactors, or power switching transistors. Therefore, there is no need for drive circuits, detection circuits, and complex switching control logic. Each DC / DC converter only needs to operate as an independent module, simplifying the control strategy, reducing design costs, and lowering the failure rate. The fixed conductive structure also eliminates switching operation losses, reducing the overall system loss. The first interface group can also connect two or more DC / DC converters, providing good system scalability and adapting to more occasions.

[0017] In addition, this application also provides an energy storage system, which corresponds to the above-described conversion connection structure for energy storage DC / DC converters, and has the same effect. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a conversion connection structure for an energy storage DC / DC converter provided in an embodiment of this application; Figure 2 A schematic diagram of a parallel topology connection of two DC / DC converters on the PCB of a single-phase PCS provided in this application embodiment; Figure 3A schematic diagram of a series connection topology of two DC / DC converters on the PCB of a single-phase PCS provided in this application embodiment; Figure 4 This is a schematic diagram illustrating the connection of two DC / DC converters in series or parallel topology on the PCB of a PCS, as provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0021] The core of this application is to provide a conversion connection structure and energy storage system for an energy storage DC / DC converter.

[0022] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This application provides a conversion connection structure for an energy storage DC / DC converter, such as... Figure 1 As shown, it includes: a physical connection unit and an energy storage converter; The physical connection unit includes: a first interface group for connecting the output terminals of at least two DC / DC converters, and a second interface for connecting the DC input terminal of an energy storage converter; and the first interface group and the second interface are connected by a fixed conductive structure. The fixed conductive structure is a parallel topology and / or a series topology; A parallel topology connects the positive outputs of each DC / DC converter to each other and their negative outputs to each other. The series topology connects two DC / DC converters end to end. When the number of DC / DC converters is greater than two, the series topology is formed by first connecting every two DC / DC converters in series to form a series branch, and then connecting each series branch in parallel.

[0024] The conversion connection structure for energy storage DC / DC converters provided in this embodiment is mainly applied in energy storage systems. Since the DC bus voltage of single-phase grid-type PCS is low, while the DC bus voltage of three-phase grid-type PCS is high, traditional solutions require designing DC / DC converters of different voltage levels separately, or using switching devices such as relays for dynamic switching. The former leads to a wide variety of products, while the latter brings problems of control complexity and decreased reliability.

[0025] This embodiment proposes a technical solution for topology selection through a physical connection unit. The conversion connection structure includes two parts: a physical connection unit and an energy storage converter. The physical connection unit is the core component, and it is equipped with a first interface group and a second interface. The first interface group is used to connect the output terminals of at least two DC / DC converters, each of which can be an independent power unit, used to convert the DC voltage on the battery side into a DC voltage suitable for the PCS input. The second interface is used to connect the DC input terminal of the energy storage converter.

[0026] Within the physical connection unit, the first interface group and the second interface are electrically connected through a fixed conductive structure. This fixed conductive structure refers to a physical connection path formed using rigid or semi-rigid conductors such as copper foil, jumpers, or metal busbars. This path is determined once during product manufacturing or system integration and remains unchanged during operation. The fixed conductive structure can be configured as a parallel topology or a series topology.

[0027] The specific connection method of the parallel topology is to connect the positive output terminals of each DC / DC converter together, and simultaneously connect the negative output terminals of each DC / DC converter together. Then, connect the parallel-connected positive and negative output terminals to the corresponding second interface (including the positive and negative outputs). In this way, the output terminals of multiple DC / DC converters are connected in parallel and then output to the PCS through the second interface. At this point, the voltage received by the PCS is equal to the output voltage of a single DC / DC converter, the total current is the sum of the output currents of each module, and the total power is the sum of the power of each module. This mode is suitable for scenarios requiring a lower DC bus voltage, such as single-phase grid-type PCS.

[0028] In a series topology, two DC / DC converters are connected end-to-end. If there are more than two DC / DC converter modules (one module consists of two DC / DC converters), then every two converters are connected in series and then in parallel. The voltage received by the PCS is the sum of the output voltages of the two DC / DC converters, while the total current is half the number of DC / DC converters, and the total power is still the sum of the power of each module. This mode is suitable for scenarios requiring a higher DC bus voltage, such as three-phase grid PCS.

[0029] This embodiment does not strictly limit the specific number of DC / DC converters; it can be two, four, or more (an even number). It also does not mean that each module must have exactly the same specifications, but using modules of the same specifications can achieve the best voltage and power matching effect. Furthermore, the fixed conductive structure does not contain relays, contactors, or power semiconductor switches, thus eliminating the losses and control complexity issues associated with dynamic switching. Therefore, this embodiment achieves the goal of adapting PCS of different voltage levels using the same set of DC / DC converters through a simple physical connection unit.

[0030] The conversion connection structure for energy storage DC / DC converters provided in this application, through the setting of physical connection units with parallel and / or series topologies, allows the same group of DC / DC converters to adapt to energy storage converters of different voltage levels: parallel mode adapts to single-phase PCS on low-voltage buses, and series mode adapts to three-phase PCS on high-voltage buses, eliminating the need to design separate high- and low-voltage DC / DC converters for different grid types. This allows each DC / DC converter to operate at its rated output voltage point without needing to extend the voltage range of a single module. Compared to the solution of using a wide-range DC / DC converter to accommodate two scenarios, which leads to a significant decrease in efficiency, each DC / DC converter in this application always operates at its optimal efficiency point, while the overall system efficiency is higher. In addition, the parallel or series topology is physically implemented in one step by a fixed conductive structure, without involving electronic switches such as relays, contactors, or power switching transistors. Therefore, there is no need for drive circuits, detection circuits, and complex switching control logic. Each DC / DC converter only needs to operate as an independent module, simplifying the control strategy, reducing design costs, and lowering the failure rate. The fixed conductive structure also eliminates switching operation losses, reducing the overall system loss. The first interface group can also connect two or more DC / DC converters, providing good system scalability and adapting to more occasions.

[0031] Specifically, the physical connection unit is integrated on the printed circuit board of the energy storage converter, and the fixed conductive structure is a copper foil trace or soldered jumper that is solidified in the printed circuit board layer.

[0032] In actual product design, the physical connection unit can be integrated onto the printed circuit board (PCB) of the energy storage converter. That is, the first interface group, the second interface, and the fixed conductive structure are directly fabricated on the PCS's PCB. The fixed conductive structure is specifically manifested as copper foil traces embedded within the PCB layers, or implemented using soldered jumpers. The width of the copper foil traces can be designed according to the current magnitude, while jumpers are suitable for scenarios requiring flexible topology changes during small-batch production or debugging.

[0033] The advantage of this integrated approach is that it eliminates the need for additional physical connection unit housings and wiring harnesses; the entire conversion connection structure is completely built into the PCS, resulting in high system integration and a small footprint. Simultaneously, the copper foil traces on the PCB offer excellent heat dissipation and low parasitic parameters, which improve the system's electrical performance. Therefore, this approach is particularly suitable for energy storage products with high standardization and large production volumes.

[0034] like Figure 2 As shown, the physical connection unit is integrated on the printed circuit board of the energy storage converter and is fixed as a parallel topology. Parallel copper foil wiring or series copper foil wiring is pre-set on the PCB board. The output terminals of the first DC / DC converter and the second DC / DC converter are physically connected in parallel on the PCB board through parallel wiring.

[0035] like Figure 3 As shown, the physical connection unit is integrated on the printed circuit board of the energy storage converter and is fixed as a series topology. The output terminals of the first DC / DC converter and the second DC / DC converter are physically connected in series on the PCB board.

[0036] When there are two DC / DC converters, the PCB board has two sets of output terminal blocks or one set of terminal blocks or plugs with four terminals, which correspond to the output terminals of the first DC / DC converter and the second DC / DC converter, respectively; the two sets of terminal blocks or terminals are connected in parallel or in series through optional copper foil traces or jumpers.

[0037] like Figure 4 As shown, the PCS is designed to be compatible with both three-phase and single-phase PCS PCBs. When manufactured as a single-phase PCS, jumper wires 1 and 2 are soldered; when manufactured as a three-phase PCS, jumper wire 3 is soldered.

[0038] Specifically, the physical connection unit is a metal busbar assembly or a terminal box, and the fixed conductive structure is the molded conductor of the metal busbar assembly or the detachable jumper in the terminal box.

[0039] When metal busbar assemblies are used, the fixed conductive structure is a shaped conductor, which is usually made of copper or aluminum by stamping or machining. The surface can be tin-plated or silver-plated to reduce contact resistance. Metal busbar assemblies have the characteristics of high current carrying capacity and good heat dissipation performance, making them particularly suitable for high-current parallel scenarios.

[0040] When using a terminal box, the fixed conductive structure can be a detachable jumper within the terminal box. That is, multiple terminals and jumper positions are pre-installed inside the terminal box, and parallel or series topologies are selected by installing or removing the jumper. Although this method requires manual jumper installation during production, it still falls into the category of one-time fixed installation, without dynamic switching during operation. The advantage of detachable jumper is that it facilitates on-site adjustments and production changes, making it particularly suitable for small-batch, multi-variety production models.

[0041] Specifically, each DC / DC converter has the same rated output voltage and rated power rating.

[0042] In actual operation, when multiple DC / DC converters are connected in parallel or series, if the rated parameters of each module are inconsistent, it may lead to uneven current or voltage fluctuations between the modules, thus affecting the overall performance of the system. To ensure good matching of output voltage and power after parallel or series connection, it is preferable that each DC / DC converter adopt the same rated output voltage and rated power rating.

[0043] This design allows energy to be evenly distributed among the modules, extending the lifespan of the modules and improving the reliability of the system.

[0044] For example, when there are two DC / DC converter modules with a rated voltage of U and a power of P, when connected in series, the total voltage received by the PCS is the sum of the two DC / DC output voltages, i.e., 2U. The output current is the single-channel current, and the total output power remains 2P, suitable for high-voltage buses. When connected in parallel, the total current received by the PCS is the sum of the two DC / DC output currents, the total output power is 2P, and the output voltage remains U, suitable for low-voltage buses.

[0045] Specifically, the outer casing of the physical connection unit is equipped with a foolproof guide structure; The foolproof guiding structure is as follows: the fixed conductive structure is a parallel topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the single-phase grid-type energy storage converter; the fixed conductive structure is a series topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the three-phase grid-type energy storage converter.

[0046] Since single-phase and three-phase PCS DC input ports typically have different interface definitions or physical dimensions, this foolproof design prevents parallel physical connection units from being inserted into the input port of a three-phase PCS, and series physical connection units from being inserted into the input port of a single-phase PCS. This avoids equipment damage or safety accidents caused by incorrect connections. This embodiment does not strictly limit the specific form of the foolproof structure; it can be implemented in various ways, such as differences in the number of pins, differences in the shape of the socket, and differences in the positioning keyway.

[0047] The foolproof design not only improves installation efficiency but also reduces maintenance costs caused by human error.

[0048] Specifically, when the physical connection units include parallel topologies and series topologies: The parallel and series topologies share the same second interface. The first interface group contains two sets of input terminals, corresponding to the parallel and series topologies respectively.

[0049] When both parallel and series topologies are configured within the physical connection unit, a design that uses a shared second interface can be adopted. In this case, the first interface group contains two sets of input terminals, one set corresponding to the parallel topology and the other set corresponding to the series topology. The two sets of input terminals have different physical locations or different interface specifications to prevent confusion when two DC / DC converters are connected simultaneously.

[0050] A single physical connection unit can simultaneously meet the needs of two application scenarios. During production, only one type of material needs to be manufactured. In the final assembly stage, the DC / DC converter can be connected to either the parallel or series input terminal block based on actual requirements. That is, the physical connection unit itself does not need to distinguish between parallel and series versions, reducing material management costs. However, this embodiment is not strictly limited; the parallel and series topologies can each correspond to two independent second interfaces, used to connect different types of energy storage converters. The design of two sets of input terminals allows the system to quickly switch between different topology modes without changing the hardware configuration, thereby adapting to complex operating environments.

[0051] Specifically, the physical connection unit also includes: fuses; The fuse is connected in series in the output circuit of the DC / DC converter.

[0052] Fuses are connected in series in the output circuit of each DC / DC converter. That is, a fuse is inserted in series between the positive or negative output terminal of each DC / DC converter and a fixed conductive structure. When a short-circuit fault occurs in a module, the fuse quickly blows, isolating the faulty module from the system and preventing the fault from spreading to the entire energy storage system. The rated current of the fuse can be selected based on the maximum output current of a single DC / DC converter. Alternatively, circuit breakers can be used instead of fuses, but fuses are more suitable for high-power energy storage scenarios due to their low cost and high breaking capacity.

[0053] Specifically, the physical connection unit also includes: filter capacitors; The filter capacitor is connected in parallel between the positive and negative terminals of the second interface.

[0054] A filter capacitor is connected in parallel between the positive and negative terminals of the second interface. The main function of the filter capacitor is to smooth the DC voltage output of the DC / DC converter and filter out switching frequency ripple. Simultaneously, when the load current on the PCS side experiences a sudden change, the filter capacitor can instantaneously provide or absorb charge, suppressing overshoot and undershoot of the DC bus voltage. The filter capacitor can be a single aluminum electrolytic capacitor, or multiple capacitors connected in parallel, or used in combination with ceramic capacitors or film capacitors to balance low-frequency ripple suppression and high-frequency noise filtering. The capacitance value and voltage rating should be selected based on the system's operating voltage and ripple requirements.

[0055] By introducing a filter capacitor, the ripple amplitude in the output voltage can be effectively reduced, thereby improving the overall power quality.

[0056] Specifically, the outer casing of the physical connection unit is equipped with an identification unit; The identification unit includes: Color-coded areas are used to distinguish parallel or series topologies by color. Textual markings are used to identify rated voltage, rated current, or topology type; Electronic tags are used to enable the host computer to automatically identify the topology type.

[0057] The identification unit includes three forms: color-coded areas, text labels, and electronic tags. Color-coded areas are used to distinguish between parallel and series topologies; for example, a blue tag indicates a parallel topology, while a red tag indicates a series topology. Text labels are used to identify rated voltage, rated current, or topology type, and can be directly printed on the casing surface using laser marking or screen printing. Electronic tags, which can be RFID tags or memory chips, are used by the host computer to automatically identify the topology type. Once the PCS or host computer reads the information from the electronic tag, it can automatically configure operating parameters or perform safety checks.

[0058] It should be noted that these three identification methods can be used individually or in combination. For example, using both color codes and text labels facilitates both human visual identification and automatic reading by equipment. Electronic tags are particularly suitable for large-scale energy storage power stations where there are many devices and centralized management is required.

[0059] During equipment inspections or troubleshooting, maintenance personnel can quickly obtain detailed equipment configuration information through electronic tags without having to consult complex paper documents.

[0060] Finally, this application provides an energy storage system, including: an energy storage battery cluster, at least two DC / DC converters, and the above-described conversion connection structure for the energy storage DC / DC converters.

[0061] The energy storage battery cluster serves as an energy storage unit, with its output terminals connected to the input terminals of various DC / DC converters. The output terminals of each DC / DC converter are connected via the first interface group of the conversion connection structure. After the conversion connection structure electrically connects the outputs of each module according to a preset topology (parallel or series), it outputs the power to the DC input terminal of the energy storage converter via the second interface. The energy storage converter then converts the DC power into AC power and feeds it into the power grid.

[0062] Therefore, the entire energy storage system achieves the ability to adapt to different voltage levels of the power grid using the same set of DC / DC converters and battery clusters by introducing a simple, non-dynamically switching conversion connection structure. Compared with traditional solutions, this system does not require the design of two separate sets of DC / DC converters for low voltage and high voltage, nor does it require complex relay switching control, and features a simple structure, low cost, and high reliability.

[0063] The conversion connection structure and energy storage system for an energy storage DC / DC converter provided in this application have been described in detail above. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

[0064] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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. Without further limitations, 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 the element.

Claims

1. A conversion connection structure for an energy storage DC / DC converter, characterized in that, include: Physical connection unit, energy storage converter; The physical connection unit includes: a first interface group for connecting the output terminals of at least two DC / DC converters, and a second interface for connecting the DC input terminal of an energy storage converter; and the first interface group and the second interface are connected by a fixed conductive structure. The fixed conductive structure is a parallel topology and / or a series topology; The parallel topology connects the positive output terminals and negative output terminals of each DC / DC converter to each other. The series topology is to connect two DC / DC converters end to end. When the number of DC / DC converters is greater than two, the series topology is to first connect every two DC / DC converters in series to form a series branch, and then connect each series branch in parallel.

2. The conversion connection structure for an energy storage DC / DC converter according to claim 1, characterized in that, The physical connection unit is integrated on the printed circuit board of the energy storage converter, and the fixed conductive structure is a copper foil trace or soldered jumper solidified in the printed circuit board layer.

3. The conversion connection structure for an energy storage DC / DC converter according to claim 1, characterized in that, The physical connection unit is a metal busbar assembly or a terminal box, and the fixed conductive structure is a shaped conductor of the metal busbar assembly or a detachable jumper in the terminal box.

4. The conversion connection structure for an energy storage DC / DC converter according to any one of claims 1-3, characterized in that, Each of the aforementioned DC / DC converters has the same rated output voltage and rated power rating.

5. The conversion connection structure for an energy storage DC / DC converter according to claim 3, characterized in that, The outer shell of the physical connection unit is provided with a foolproof guide structure; The foolproof guiding structure is as follows: the fixed conductive structure is a parallel topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the single-phase grid-type energy storage converter; the fixed conductive structure is a series topology, and the physical shape or pin arrangement of the second interface corresponds to the input port of the three-phase grid-type energy storage converter.

6. The conversion connection structure for an energy storage DC / DC converter according to claim 3, characterized in that, When the physical connection unit includes parallel topology and series topology: The parallel topology and the series topology share the same second interface. The first interface group includes two sets of input terminals, corresponding to the parallel topology and the series topology, respectively.

7. The conversion connection structure for an energy storage DC / DC converter according to claim 1, characterized in that, The physical connection unit also includes: a fuse; The fuse is connected in series in the output circuit of the DC / DC converter.

8. The conversion connection structure for an energy storage DC / DC converter according to claim 1, characterized in that, The physical connection unit further includes: a filter capacitor; The filter capacitor is connected in parallel between the positive and negative terminals of the second interface.

9. The conversion connection structure for an energy storage DC / DC converter according to claim 1, characterized in that, The outer shell of the physical connection unit is provided with an identification unit; The identification unit includes: Color-coded areas are used to distinguish parallel or series topologies by color. Textual markings are used to identify rated voltage, rated current, or topology type; Electronic tags are used to enable the host computer to automatically identify the topology type.

10. An energy storage system, characterized in that, include: The energy storage battery cluster, at least two DC / DC converters, and the conversion connection structure for the energy storage DC / DC converter as described in any one of claims 1 to 9.

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