Electric energy conversion fusion unit and energy storage unit

Abstract

The utility model provides an electric energy conversion fusion unit and an energy storage unit. The electric energy conversion and fusion unit comprises a shell, a high-voltage box module and a high-voltage cascade power conversion system PCS module, the high-voltage box module and the high-voltage cascade PCS module are respectively arranged in different cavities in the shell; the high-voltage box module comprises a high-voltage box primary loop and a high-voltage box secondary loop; a layer plate is arranged in a cavity where the high-voltage box module is located, a high-voltage box primary loop and a high-voltage box secondary loop are arranged on an upper layer and a lower layer respectively through the layer plate, and the upper layer loop and the layer plate are insulated and isolated through an insulator or an insulating plate. And a plurality of wiring holes and a plurality of maintenance holes are also formed in the laminate. According to the electric energy conversion and fusion unit, physical isolation of the high-voltage box primary loop and the high-voltage box secondary loop is achieved through layered arrangement, the integration level and the space utilization rate of the electric energy conversion and fusion unit are improved, loss in the electric energy transmission process is reduced, and therefore the overall electric energy conversion efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage battery, and in particular to an electric energy conversion fusion unit and an energy storage unit. BACKGROUND

[0002] The high-voltage cascade energy storage system realizes unified scheduling and control of the entire power system by connecting multiple battery packs in a specific way. The system can directly output a voltage level of 6kV, 10kV or even 35kV or above, without the need for a transformer, thereby reducing system loss and improving efficiency.

[0003] The existing high-voltage cascade energy storage system is mainly composed of a high-voltage box and a PCS module. However, the high-voltage box and the PCS module are designed in a split type, and the overall integration degree is not high. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an electric energy conversion fusion unit and an energy storage unit to solve the problem of low overall integration degree of the high-voltage cascade energy storage system caused by the split arrangement of the existing high-voltage box and PCS module.

[0005] In a first aspect, the present application provides an electric energy conversion fusion unit, comprising: a shell, a high-voltage box module and a high-voltage cascade power conversion system (PCS) module; the high-voltage box module and the high-voltage cascade PCS module are respectively arranged in different cavities in the shell; the high-voltage box module comprises a high-voltage box primary circuit and a high-voltage box secondary circuit;

[0006] The high-voltage box primary circuit comprises a primary circuit fuse, a primary circuit contactor, a pre-charge contactor, a pre-charge resistor and an isolation switch; the primary circuit fuse, the primary circuit contactor and the isolation switch are connected in sequence and connected with the high-voltage cascade PCS module, and the pre-charge contactor is connected in parallel with the primary circuit contactor at the positive electrode through the pre-charge resistor.

[0007] The high-voltage box secondary circuit comprises a power taking fuse, a power taking switch, a power supply module and a battery condition monitoring system (BCMS).

[0008] In the above electric energy conversion fusion unit, optionally, the connection point of the power taking fuse and the primary circuit fuse is between the connection of the primary circuit fuse and the battery cluster.

[0009] In the above electric energy conversion fusion unit, optionally, the cavity where the high-voltage box module is located has a layer plate, and the high-voltage box primary circuit and the high-voltage box secondary circuit are arranged in the upper and lower layers respectively through the layer plate.

[0010] In the power conversion fusion unit, optionally, the high-voltage box primary loop is arranged at the lower layer, and the high-voltage box secondary loop is arranged at the upper layer.

[0011] In the power conversion fusion unit, optionally, the power conversion fusion unit further comprises an optical-electricity switch arranged at the upper layer, and the optical-electricity switch has an insulation gap with the shell.

[0012] In the power conversion fusion unit, optionally, each device in the upper layer is isolated from the layer board by an insulating sub or an insulating board.

[0013] In the power conversion fusion unit, optionally, the layer board has a plurality of wiring openings, and the wiring openings are used for wiring between the high-voltage box primary loop and the high-voltage box secondary loop.

[0014] In the power conversion fusion unit, optionally, the layer board has a plurality of maintenance openings, and the positions of the maintenance openings correspond to the positions of mounting bolts of devices in the high-voltage box secondary loop.

[0015] In the power conversion fusion unit, optionally, copper bar wiring between the high-voltage box module and the high-voltage cascade PCS module is arranged in the shell.

[0016] In a second aspect, the application further provides a power storage unit, comprising a battery cluster and the power conversion fusion unit as described in the first aspect and various possible implementation manners of the first aspect.

[0017] The electric energy conversion fusion unit and the energy storage unit provided by the application, the electric energy conversion fusion unit comprises a shell, a high-voltage box module and a high-voltage cascade power conversion system (PCS) module; the high-voltage box module and the high-voltage cascade PCS module are arranged in different cavities in the shell respectively; the high-voltage box module comprises a high-voltage box primary loop and a high-voltage box secondary loop, the high-voltage box primary loop comprises a primary loop fuse, a primary loop contactor, a pre-charging contactor, a pre-charging resistor and an isolation switch; the high-voltage box secondary loop comprises a power taking fuse, a power taking switch, a power supply module and a battery condition monitoring system (BCMS), and the connection point of the power taking fuse and the primary loop fuse is between the primary loop fuse and the connection of the battery cluster; the cavity where the high-voltage box module is located has a layer plate, the high-voltage box primary loop and the high-voltage box secondary loop are arranged in the upper and lower layers respectively through the layer plate, and the upper layer loop is insulated and isolated from the layer plate through an insulating support or an insulating plate; a plurality of wiring openings and a plurality of maintenance openings are further arranged on the layer plate. By arranging the high-voltage box module and the high-voltage cascade PCS module in different cavities in the shell respectively and arranging them in layers, the physical isolation of the high-voltage box primary loop and the high-voltage box secondary loop is realized, the interference of the high-voltage box primary loop on the high-voltage box secondary loop is reduced, the integration and the space utilization of the electric energy conversion fusion unit are improved, and the close integration of the high-voltage box module and the high-voltage cascade PCS module helps to reduce the loss in the process of electric energy transmission, thereby improving the overall electric energy conversion efficiency.

[0018] The construction of the application and other application purposes and beneficial effects thereof will be more obvious and understandable through the description of the preferred embodiments in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 The external structure schematic diagram of the energy storage unit provided by the embodiment of the application;

[0021] Figure 2 The external structure schematic diagram of the electric energy conversion fusion unit provided by the embodiment of the application;

[0022] Figure 3 The structure schematic diagram of the electric energy conversion fusion unit provided by the embodiment of the application;

[0023] Figure 4 The topology schematic diagram of the connection of the high-voltage box module and the high-voltage cascade PCS module provided by the embodiment of the application;

[0024] Figure 5 A cross-sectional structure diagram of a layer plate in a high-voltage box module is provided for an embodiment of the present application.

[0025] Figure 6 A fusion panel diagram of an electric energy conversion fusion unit is provided for an embodiment of the present application.

[0026] Legend of reference signs:

[0027] 100 - electric energy conversion fusion unit

[0028] 110 - shell

[0029] 120 - high-voltage box module

[0030] 121 - high-voltage box primary circuit

[0031] 122 - high-voltage box secondary circuit

[0032] 123 - layer plate

[0033] 124 - wiring opening

[0034] 125 - maintenance opening

[0035] 130 - high-voltage cascade PCS module

[0036] A - first direction

[0037] B - second direction

[0038] C - third direction

[0039] 200 - battery cluster

[0040] 300 - energy storage unit

[0041] The above-described drawings show certain embodiments of the present application. More detailed descriptions of the application will be given in the following. The drawings and the written description are not intended to limit the scope of the present application in any way. Rather, they are intended to explain the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The same reference numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the implementations consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0043] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. In the drawings, the same or similar notations represent the same or similar components or components having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0044] In the description of the embodiments of the present application, it should be understood that, unless specifically defined and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented, for example, in an order other than that illustrated or described herein.

[0046] In the embodiments of the present application, the words "exemplary" or "for example" are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0047] Firstly, the terms involved in the present application are explained,

[0048] High voltage box: as the core container of the energy storage system, the high voltage box is responsible for safely and efficiently packaging and managing the battery pack; it usually has multiple safety mechanisms such as overvoltage protection, overcurrent protection, short circuit protection, etc. to ensure that the battery pack is protected from damage under extreme working conditions.

[0049] PCS module: Power Conversion System, also known as PCS, is responsible for converting the DC power stored in the high-voltage box into AC power required by the grid or load, or converting AC power into DC power for battery charging; PCS module not only requires high efficiency energy conversion, but also needs to have the ability to quickly respond to grid fluctuations, and flexible switching between grid-connected and off-grid modes, to adapt to different application scenarios and needs.

[0050] BCMS: Battery Cluster Management System, is an electronic system specifically designed to monitor and manage the status of battery clusters, which is mainly responsible for monitoring and managing key parameters such as voltage, current, temperature, etc. of battery clusters to ensure safe, stable and efficient operation of battery clusters; in addition, BCMS can intelligently adjust the charging and discharging strategy according to the actual state of the battery to maximize the available capacity and cycle life of the battery pack.

[0051] IGBT: Insulated Gate Bipolar Transistor, is a high-performance power semiconductor device. IGBT combines the characteristics of metal-oxide-semiconductor field-effect transistor and bipolar transistor, and is a composite full-control voltage-driven power semiconductor device with high voltage and large current handling capability, and has a self-turn-off function.

[0052] Optical switch: also known as optical network switch or fiber switch, is a device used to transmit data in computer networks, which uses optical signals (through optical fibers) instead of electrical signals to forward data packets; compared with traditional copper-based Ethernet switches, optical switches have higher speed, lower delay and longer transmission distance.

[0053] Floating ground system: is a circuit system that floats the circuit system (including equipment grounding / shell part), and the entire electrical equipment and circuit is not connected to the ground.

[0054] High-voltage cascade energy storage system realizes unified scheduling and control of the entire power system by connecting multiple battery packs in a specific way; this system can directly output 6kV, 10kV or even 35kV or higher voltage levels without the need for a transformer, thereby reducing system losses and improving efficiency.

[0055] High-voltage cascade energy storage system is particularly suitable for high-power, high-capacity energy storage power stations such as new energy stations, large industrial and commercial users, and grid-side energy storage, etc. In these scenarios, high-voltage cascade energy storage systems can fully utilize their high efficiency, large capacity and easy-to-manage features to provide stable and reliable power support for users.

[0056] The existing high-voltage cascade energy storage system is a high-efficiency and advanced energy storage solution, and the core components thereof are usually composed of a high-voltage box and a PCS module. This system architecture not only ensures efficient storage and conversion of energy, but also realizes accurate monitoring and management of the state of the battery pack through the built-in BCMS.

[0057] However, the existing high-voltage box and PCS module are usually arranged separately, resulting in a large overall volume of the high-voltage cascade energy storage system and low overall integration. In addition, in the main circuit of the high-voltage cascade energy storage system, once a fuse failure occurs, the BCMS of the entire system may lose power supply and fail to work normally.

[0058] To solve the above technical problems, the embodiments of the present application provide an electric energy conversion fusion unit. By arranging the high-voltage box and the PCS module in different cavities in the same housing, and then layering the devices of the power circuit and the control circuit in the high-voltage box, and making the short-circuit protection of the control circuit independent of the power circuit, the interference of the power circuit on the control circuit is reduced, the appearance design of the high-voltage cascade energy storage system is optimized, the overall integration of the high-voltage cascade energy storage system is improved, and the normal operation of the BCMS is ensured.

[0059] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0060] Figure 1 A structural schematic diagram of an energy storage unit provided by the embodiments of the present application is shown in the figure. Figure 2 An external structural schematic diagram of an electric energy conversion fusion unit provided by the embodiments of the present application is shown in the figure. Figure 3 A structural schematic diagram of an electric energy conversion fusion unit provided by the embodiments of the present application is shown in the figure. Figure 4 A topological schematic diagram of the connection between a high-voltage box module and a high-voltage cascade PCS module provided by the embodiments of the present application is shown in the figure. Figure 5 A cross-sectional structural schematic diagram of a layer plate in a high-voltage box module provided by the embodiments of the present application is shown in the figure. Figure 6 A fusion panel schematic diagram of an electric energy conversion fusion unit provided by the embodiments of the present application is shown in the figure.

[0061] Referring to the drawings Figure 1 and the drawings Figure 2 As shown in the drawings, in the first aspect, the embodiments of the present application provide an energy storage unit 300, which comprises a battery cluster 200 and an electric energy conversion fusion unit 100, and the electric energy conversion fusion unit 100 is arranged in the energy storage unit 300.

[0062] In the embodiments of the present application, the energy storage unit 300 is composed of the battery cluster 200 and the power conversion fusion unit 100. The energy storage unit 300 converts the alternating current of the power grid side to the battery cluster 200 through the power conversion fusion unit 100, and the power conversion process is reversible, thereby improving the energy utilization efficiency and enhancing the stability of the power system. Exemplarily, the battery cluster 200, as the main carrier of stored power, is composed of a plurality of single batteries combined in a specific series-parallel mode, has the characteristics of high energy density and long cycle life, and is the basis for ensuring that the energy storage unit 300 can continuously and stably provide power.

[0063] Referring to the accompanying drawings Figure 2 to the accompanying drawings Figure 6 In a second aspect, the embodiments of the present application also provide a power conversion fusion unit 100, which comprises a shell 110, a high-voltage box module 120 and a high-voltage cascade power conversion system PCS module. The space in the shell 110 is divided into a plurality of cavities, and the high-voltage box module 120 and the PCS module are arranged in different cavities in the shell 110, respectively. The high-voltage box module 120 comprises a high-voltage box primary circuit 121 and a high-voltage box secondary circuit 122 (not all shown in the figure).

[0064] Referring to the accompanying drawings Figure 2 to the accompanying drawings Figure 6 Specifically, the high-voltage box primary circuit 121 comprises a primary circuit fuse, a primary circuit contactor, a pre-charging contactor, a pre-charging resistor and an isolation switch. The high-voltage box secondary circuit 122 comprises a power taking fuse, a power taking switch, a power supply module and a battery condition monitoring system BCMS (not shown in the figure).

[0065] It can be understood that the internal space of the power conversion fusion unit 100 is divided into a plurality of cavities, and the high-voltage box module 120 and the high-voltage cascade PCS module 130 are arranged in different cavities, respectively. Among them, the high-voltage box module 120 is responsible for receiving high-voltage power from the power grid or the battery cluster 200, and reasonably distributing it to each high-voltage electrical component according to the demand of the power system. The high-voltage cascade PCS module 130 can convert the alternating current in the power grid into direct current and store it in the battery cluster 200. When the power supply of the power grid is insufficient or a backup power source is needed, the high-voltage cascade PCS module 130 can also convert the direct current in the battery cluster 200 into alternating current for users to use.

[0066] Referring to the accompanying drawings Figure 2 The first direction A, the second direction B and the third direction C are perpendicular to each other, for example, the first direction A, the second direction B and the third direction C together constitute a spatial rectangular coordinate system.

[0067] Exemplarily, the appearance of the high-voltage box module 120 and the high-voltage cascade PCS module 130 after fusion is as shown in the accompanying drawings Figure 2As shown, the first direction A is consistent with the width (W) direction of the electrical energy conversion fusion unit 100, the second direction B is consistent with the length (L) direction of the electrical energy conversion fusion unit 100, and the third direction C is consistent with the height (H) direction of the electrical energy conversion fusion unit 100. The outer dimensions LxWxH are about 1055x791x340mm, and the optimization of the traditional split structure is realized.

[0068] Specifically, in the high-voltage box primary loop 121, a primary loop fuse is used to protect the safe operation of the high-voltage box primary loop 121, a pre-charging contactor is used to control the pre-charging of the high-voltage box primary loop 121, a pre-charging resistor is used to ensure the safe pre-charging process of the high-voltage box primary loop 121, to avoid damage to the devices in the high-voltage cascade PCS module 130, and a disconnecting switch is used to control the opening and closing of the high-voltage box primary loop 121. For example, the primary loop fuse can be selected from the RS series, and the pre-charging contactor can be selected from the SCII series. When the current in the high-voltage box primary loop 121 abnormally rises to a certain height, the primary loop fuse can be fused to cut off the current, thereby protecting the safe operation of the circuit.

[0069] In the high-voltage box secondary loop 122, a power taking fuse is used to protect the safe operation of the high-voltage box secondary loop 122, a power taking switch is used to control the opening and closing of the high-voltage box secondary loop 122, and a power supply module can provide power for the BCMS in the high-voltage box secondary loop 122. The BCMS can record, control and manage the relevant data of the battery cluster 200 during the electrical energy conversion process. For example, the power taking fuse can be selected from the RS series.

[0070] Based on the BCMS, the electrical energy conversion fusion unit 100 can realize intelligent distribution and management of electrical energy, automatically adjust the power and efficiency of electrical energy conversion according to factors such as grid state, battery cluster 200 state and power demand, and ensure that the energy storage unit 300 is always in the best working state. More intelligent electrical energy management not only improves the energy efficiency and reliability of the energy storage unit 300, but also provides strong support for the intelligent operation of the power system.

[0071] In the embodiment, the high-voltage box primary loop 121 is a power loop in the electrical energy conversion fusion unit 100, which realizes the electrical energy conversion between the grid side and the battery cluster 200. The high-voltage box secondary loop 122 is a control loop in the electrical energy conversion fusion unit 100, wherein the power supply module in the control loop supplies operating power to the BCMS.

[0072] Further, the primary loop fuse, the primary loop contactor and the disconnecting switch are connected in sequence and connected with the high-voltage cascade PCS module 130, and the pre-charging contactor is connected in parallel across the positive primary loop contactor through the pre-charging resistor.

[0073] It can be understood that the pre-charging contactor and the primary circuit contactor can control whether the corresponding circuit is turned on, and the pre-charging contactor and the primary circuit contactor can receive the control signal sent by the BCMS and control the corresponding circuit to be turned on at different times according to the control signal, thereby realizing pre-charging of the high-voltage cascade PCS module 130 before the power conversion fusion unit 100 performs power conversion, ensuring the normal operation of the electronic devices in the high-voltage cascade PCS module 130, and avoiding damage to the devices due to excessively high voltage.

[0074] Referring to the accompanying drawings Figure 4 For example, the high-voltage box module 120 includes a high-voltage box primary circuit 121 and a high-voltage box secondary circuit 122, wherein the high-voltage box primary circuit 121 includes: a primary circuit fuse including FU1, FU2, a primary circuit contactor including KM1, KM2, and a disconnecting switch including QS1; the high-voltage box secondary circuit 122 includes: a power taking fuse including FU3, FU4, a power taking switch including QS2, and a power supply module including DC24 / DC250-1500, and the power supply module is a direct current power supply; wherein the disconnecting switch is communicated by two switches and is respectively arranged at the input side and the output side of the high-voltage cascade PCS module 130, and the high-voltage cascade PCS module 130 is connected with the high-voltage box module 120 through the disconnecting switch, and the disconnecting switches on different sides can be opened and closed at the same time; the power taking switch is also composed of two switches and is respectively arranged at the input side and the output side of the power supply module, and the power taking switches on different sides can be opened and closed at the same time; the high-voltage cascade PCS module 130 includes: a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, and an IGBT module including SIB1, SIB2, SIB3, and SIB4; wherein the first inductor L1 and the second inductor L2 constitute a reactor part in the high-voltage cascade PCS module 130, the first capacitor C1 constitutes a capacitor part in the high-voltage cascade PCS module 130, the reactor part can improve the stability of the power conversion fusion unit 100 and enhance the anti-interference ability of the power conversion fusion unit 100, and the capacitor part can ensure the stability of power transmission, filter out harmonic currents generated by power electronic devices, and improve power quality; the IGBT module is used for realizing power transmission and switching control, realizing power conversion and distribution.

[0075] The power conversion fusion unit 100 provided by the embodiment of the present application arranges the high-voltage box module 120 and the high-voltage cascade PCS module 130 in different cavities of the same shell 110, and uses the high-voltage box primary loop 121 in the high-voltage box module 120 to realize pre-charging and power conversion of the power conversion fusion unit 100, and uses the high-voltage box secondary loop 122 to realize real-time monitoring of the battery state, thereby improving the overall integration of the power conversion fusion unit 100, saving the cost, and the close integration of the high-voltage box module 120 and the high-voltage cascade PCS module 130 helps to reduce the loss in the power transmission process, thereby improving the overall power conversion efficiency.

[0076] As an optional implementation, the connection point of the power-taking fuse and the primary loop fuse is between the connection of the primary loop fuse and the battery cluster 200.

[0077] Specifically, the connection point of the power-taking fuse and the primary loop fuse is between the connection of the primary loop fuse and the battery cluster 200, so that the high-voltage box secondary loop 122 is independent of the high-voltage box primary loop 121, and thus, when the primary loop fuse in the high-voltage box primary loop 121 is fused, the BCMS in the high-voltage box secondary loop 122 can still operate normally, and record the battery cluster parameters before and after the fusion accident, thereby providing data support for analysis of the fusion accident.

[0078] Referring to Figure 4 , the left side of the power conversion fusion unit 100 is connected with the battery cluster 200, and the right side is connected with the power grid, wherein the connection between the power conversion fusion unit 100 and the battery cluster 200 includes a battery cluster positive electrode and a battery cluster negative electrode, and exemplarily, B+ represents the battery cluster positive electrode, and B- represents the battery cluster negative electrode; the high-voltage box primary loop 121 further includes a shunt FL for measuring the current flow size flowing in the B- direction; the secondary loop fuse in the high-voltage box secondary loop 122 includes FU3 and FU4, when the FU3 is connected to the high-voltage box primary loop 121, the connection point is between the positive electrode fuse FU1 and the battery cluster positive electrode, and when the FU4 is connected to the high-voltage box primary loop 121, the connection point is between the negative electrode fuse FU1 and the shunt FL, so as to realize that the high-voltage box secondary loop 122 is independent of the high-voltage box primary loop 121, and ensure the normal operation of the BCMS in the high-voltage box secondary loop 122, that is, the control loop in the power conversion fusion unit 100 is independent of the power loop, the power-taking of the BCMS is not affected by the power loop, and only depends on the control loop.

[0079] As an optional implementation, the cavity where the high-voltage box module 120 is located has a layer plate 123, and the high-voltage box primary loop 121 and the high-voltage box secondary loop 122 are arranged in the upper and lower two layers through the layer plate 123.

[0080] In the embodiment of the present application, the cavity in which the high-voltage box module 120 is located has a layer plate 123, which is used to divide the space in the cavity into multiple levels, and the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122 are arranged in different levels of the same cavity, thereby realizing the physical isolation of the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122 and avoiding mutual interference between the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122.

[0081] As an optional implementation, the high-voltage box primary circuit 121 is arranged in the lower layer, and the high-voltage box secondary circuit 122 is arranged in the upper layer.

[0082] In the embodiment of the present application, the high-voltage box primary circuit 121 serves as the main channel for power transmission and undertakes the important task of transmitting high voltage and large current from the input end to the output end. Arranging the high-voltage box primary circuit 121 in the lower layer facilitates physical protection and isolation of the high-voltage circuit, reduces the risk of short circuit or electric shock caused by external factors, and ensures stable operation of the system by better utilizing natural convection or forced air cooling for heat dissipation. In addition, the relatively spacious lower layer facilitates wiring and fixing of high-voltage cables, thereby reducing wiring difficulty and cost.

[0083] The high-voltage box secondary circuit 122 is mainly responsible for real-time monitoring of battery status and auxiliary functions such as signal transmission. Arranging the high-voltage box secondary circuit 122 in the upper layer reduces the influence of electromagnetic interference on signal transmission of the secondary circuit and improves the accuracy and reliability of monitoring data. Since the high-voltage box secondary circuit 122 does not involve high voltage and large current, arranging it in the upper layer facilitates daily maintenance and troubleshooting by technicians. In addition, the upper layer space is more flexible in layout, and the layout and component configuration of the secondary circuit can be adjusted according to actual needs to maximize space utilization.

[0084] The layered arrangement of the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122 not only improves the integration and space utilization of the power conversion fusion unit 100, but also significantly enhances the safety, stability, and maintainability of the power conversion fusion unit 100. Through reasonable layout and component configuration, efficient conversion and precise control of electric energy are realized.

[0085] As an optional implementation, the power conversion fusion unit 100 further comprises an optical-electricity switch (not shown in the figure), which is arranged in the upper layer and has an insulating gap between the optical-electricity switch and the shell 110.

[0086] Specifically, the power conversion fusion unit 100 is additionally provided with an optical-electricity switch, which is arranged in the upper layer area of the cavity where the high-voltage box module 120 is located. As a high-speed and high-reliability data transmission device, the optical-electricity switch can realize efficient and accurate data communication within the power conversion fusion unit 100 or between the power conversion fusion unit 100 and other systems. Arranging the optical-electricity switch in the upper layer is conducive to reducing the cable length and complexity, reducing signal attenuation and interference, and thus improving the stability and efficiency of data transmission.

[0087] In order to ensure the safe operation of the optical-electricity switch in the high-voltage environment, an insulation gap is formed between the optical-electricity switch and the shell 110 by using an insulating plate, thereby effectively isolating the potential difference between the high-voltage electrical part and the optical-electricity switch and preventing electrical breakdown and short-circuit accidents.

[0088] For example, the optical-electricity switch is supported by the insulating plate, and an insulation gap of 4mm is maintained between the switch panel and the shell 110 of the power conversion fusion unit 100 in the second direction B, so as to ensure the safe operation of the optical-electricity switch.

[0089] As an optional embodiment, the devices in the upper layer of the high-voltage box module 120 are isolated from the layer plate 123 by an insulator or an insulating plate.

[0090] Specifically, the devices in the upper layer of the high-voltage box module 120 are isolated from the layer plate 123 by an insulator or an insulating plate. The insulator or the insulating plate has excellent electrical insulation performance and mechanical strength, which can effectively prevent electrical breakdown and short-circuit accidents. In addition, the insulation isolation measure also provides a relatively independent electrical environment for the high-voltage box secondary circuit 122, so that it can work normally without being disturbed by the high-voltage electrical part. Since the high-voltage box secondary circuit 122 is electrically isolated from the high-voltage electrical part, it is more convenient to operate and detect the low-voltage part during system maintenance and fault diagnosis.

[0091] In some embodiments, in addition to the insulator or the insulating plate, other multi-layer protection designs such as adding an insulating coating and using a shielding cover can be used to further improve the electrical safety and reliability of the system.

[0092] The application does not specially limit the arrangement of the insulator or the insulating plate.

[0093] By introducing the optoelectronic switch and taking insulation isolation measures of the upper layer device of the high-voltage box module 120, the grounding mode of the high-voltage box secondary circuit 122 is a floating ground system; the floating ground system can effectively isolate the potential difference between the high-voltage electrical part and the low-voltage control and monitoring part, prevent electrical breakdown and short circuit accidents, and thus improve the safety of the system; in addition, the floating ground system can reduce the influence of external interference on the stability of the power conversion fusion unit 100, and improve the anti-interference ability and stability of the power conversion fusion unit 100.

[0094] As an optional implementation, the layer plate 123 has a plurality of wiring openings 124; the wiring openings 124 are used for the wiring connection between the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122.

[0095] In the embodiments of the present application, the layer plate 123 is an important component of the internal structure of the high-voltage box module 120, and its design directly affects the wiring layout, electrical performance and heat dissipation efficiency of the system; in order to optimize the wiring connection between the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122, a plurality of wiring openings 124 and a plurality of maintenance openings 125 are reserved on the layer plate 123.

[0096] It can be understood that, in order to ensure that the wiring connection between the high-voltage box primary circuit 121 and the high-voltage box secondary circuit 122 can be wired in the shortest path and with the smallest bending degree, the positions and the number of the wiring openings 124 are determined, which helps to reduce the loss of the cable and improve the stability and efficiency of signal transmission. The present application does not make special limitation on the determination of the positions and the number of the wiring openings 124.

[0097] As an optional implementation, the layer plate 123 has a plurality of maintenance openings 125; the positions of the maintenance openings 125 correspond to the positions of the mounting bolts of the devices in the high-voltage box secondary circuit 122.

[0098] In the embodiments of the present application, in order to facilitate the maintenance and replacement of the devices in the high-voltage box secondary circuit 122, a plurality of maintenance openings 125 are reserved on the layer plate 123; the positions of the plurality of maintenance openings 125 correspond to the positions of the mounting bolts of the devices in the high-voltage box secondary circuit 122, so that the devices can be directly operated through the maintenance openings 125 without disassembling the entire high-voltage box module 120. The present application does not make special limitation on the determination of the positions and the number of the maintenance openings 125.

[0099] In some embodiments, in order to ensure the safety during operation, special protective devices or warning signs can be arranged at the maintenance openings 125 to remind the technicians to pay attention to electrical safety and protective measures during operation.

[0100] For example, in order to facilitate the wiring and maintenance of the computer fusion unit, two wiring openings 124 and three maintenance openings 125 are reserved on the upper panel of the high-voltage box. Through the three maintenance openings 125, the long rod tool is used to remove the bolts of the outgoing line of the lower primary circuit fuse and the disconnector, without the need to remove the layer plate 123 between the primary circuit 121 of the high-voltage box and the secondary circuit 122 of the high-voltage box, so as to realize the maintenance and replacement of the primary circuit fuse, greatly facilitating the maintenance work of the vulnerable devices in the energy conversion deterioration section. Through the optimization of the wiring openings 124 and the maintenance openings 125 of the layer plate 123, not only the overall performance and safety of the high-voltage box module 120 are improved, but also the maintainability and expansibility of the system are improved.

[0101] As an optional implementation, the copper bar wiring between the high-voltage box module 120 and the high-voltage cascade PCS module 130 is arranged in the shell 110.

[0102] Specifically, in the connection between the high-voltage box module 120 and the high-voltage cascade PCS module 130, the copper bar wiring is used as the main electrical connection mode. In order to maintain the neatness of the system, improve the electrical performance and heat dissipation efficiency, and arrange the copper bar wiring in the shell 110.

[0103] Referring to the drawings Figure 6 The panel of the energy conversion fusion unit 100 is more concise than the panel of the traditional split structure. The wiring between the high-voltage box module 120 and the high-voltage cascade PCS module 130 is located inside the shell 110, thereby maintaining the aesthetics of the energy conversion fusion unit 100.

[0104] The electric energy conversion fusion unit 100 provided by the embodiment of the present application comprises a shell 110, a high-voltage box module 120 and a high-voltage cascade power conversion system PCS module; the high-voltage box module 120 and the high-voltage cascade PCS module 130 are respectively arranged in different cavities in the shell 110; the high-voltage box module 120 comprises a high-voltage box primary loop 121 and a high-voltage box secondary loop 122, the high-voltage box primary loop 121 comprises a primary loop fuse, a primary loop contactor, a pre-charging contactor, a pre-charging resistor and an isolation switch; the high-voltage box secondary loop 122 comprises a power taking fuse, a power taking switch, a power supply module and a battery condition monitoring system BCMS, the connection point of the power taking fuse and the primary loop fuse is between the primary loop fuse and the connection of the battery cluster 200; the cavity where the high-voltage box module 120 is located has a layer plate 123, the high-voltage box primary loop 121 and the high-voltage box secondary loop 122 are respectively arranged in the upper and lower layers through the layer plate 123, and the upper layer loop is insulated and isolated from the layer plate 123 through an insulator or an insulating plate; a plurality of wiring openings 124 and a plurality of maintenance openings 125 are further arranged on the layer plate 123. By arranging the high-voltage box module 120 and the high-voltage cascade PCS module 130 in different cavities in the shell 110 respectively, and realizing the physical isolation of the high-voltage box primary loop 121 and the high-voltage box secondary loop 122 through layered arrangement, the interference of the high-voltage box primary loop 121 on the high-voltage box secondary loop 122 is reduced, the integration and space utilization of the electric energy conversion fusion unit 100 are improved, and the close integration of the high-voltage box module 120 and the high-voltage cascade PCS module 130 helps to reduce the loss in the process of electric energy transmission, thereby improving the overall electric energy conversion efficiency.

[0105] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0106] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. An electrical energy conversion fusion cell, characterized by, The application relates to an electric energy conversion fusion unit. The electric energy conversion fusion unit comprises a shell, a high-voltage box module and a high-voltage cascade PCS module; the high-voltage box module and the high-voltage cascade PCS module are arranged in different cavities in the shell respectively; the high-voltage box module comprises a high-voltage box primary loop and a high-voltage box secondary loop; The high-voltage box primary loop comprises a primary loop fuse, a primary loop contactor, a pre-charging contactor, a pre-charging resistor and an isolation switch; the primary loop fuse, the primary loop contactor and the isolation switch are connected in sequence and connected with the high-voltage cascade PCS module; the pre-charging contactor is connected in parallel to the primary loop contactor of the positive electrode through the pre-charging resistor; The high-voltage box secondary loop comprises a power taking fuse, a power taking switch, a power supply module and a battery condition monitoring system (BCMS).

2. The electrical energy conversion fusion cell of claim 1, wherein, The connection point of the power taking fuse and the primary loop fuse is between the connection of the primary loop fuse and a battery cluster.

3. The electrical energy conversion fusion cell of claim 1, wherein, The cavity where the high-voltage box module is arranged has a layer plate, and the high-voltage box primary loop and the high-voltage box secondary loop are arranged in the upper and lower layers respectively through the layer plate.

4. The electrical energy conversion fusion cell of claim 3, wherein, The high-voltage box primary loop is arranged in the lower layer, and the high-voltage box secondary loop is arranged in the upper layer.

5. The electrical energy conversion fusion cell of claim 4, wherein, The application further comprises an optical-electricity switch arranged in the upper layer, and an insulation gap between the optical-electricity switch and the shell. Each device in the upper layer is isolated from the layer plate through an insulating sub or an insulating plate.

6. The electrical energy conversion fusion cell of claim 5, wherein, The layer plate has a plurality of wiring openings; the wiring openings are used for wiring connection between the high-voltage box primary loop and the high-voltage box secondary loop.

7. The electrical energy conversion fusion cell of claim 3, wherein, The layer plate has a plurality of maintenance openings; the positions of the maintenance openings correspond to the positions of mounting bolts of devices in the high-voltage box secondary loop.

8. The electrical energy conversion fusion cell of claim 6, wherein, Copper bar connection between the high-voltage box module and the high-voltage cascade PCS module is arranged in the shell.

9. The electrical energy conversion fusion cell according to any one of claims 1-7, characterized in that, The application further relates to a battery cluster and the electric energy conversion fusion unit.

10. An energy storage unit characterized by, ​ ​

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