A busbar box capable of automatically adjusting according to battery discharge difference

Abstract

The utility model discloses a kind of conflux box capable of automatically adjusting according to battery discharge difference, the box body of the conflux box is equipped with box body switch, multiple groups of current input interface and a group of current output interface, copper bar is installed in box body, a conflux circuit of stringing relay and diode is arranged between each group of current input interface and the copper bar, the relay and diode are connected in parallel after stringing and access the copper bar, shunt is arranged between the copper bar and the current output interface, EMS module and DCDC module connecting the copper bar with the EMS module are also provided in the box body, the EMS module is respectively connected with all relays, the EMS module is connected with battery management module by internal CAN bus, external CAN bus is connected with inverter module, the box body is respectively equipped with corresponding internal CAN bus communication interface and external CAN bus communication interface. By the above-mentioned mode, the utility model can guarantee the stability of output current when new and old batteries are connected.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment, and in particular to a combiner box that can automatically adjust according to the difference in battery discharge. Background Technology

[0002] As society continues to develop, most countries still rely on traditional energy sources for power generation, which produces large amounts of harmful gases. With global warming, countries have set carbon neutrality goals, making the development of new energy sources necessary. Combining photovoltaics with residential energy storage is an excellent option, effectively meeting the demands of renewable energy. As people's demand for home appliances increases, so does their electricity consumption. This necessitates expanding the capacity of existing residential energy storage systems. Due to capacity differences, the management of the parallel operation capacity of new and old batteries in combiner boxes faces higher requirements. If the inconsistencies in capacity between new and old batteries during parallel operation are not properly addressed, the entire energy storage system will become unstable, inefficient, and may even pose safety hazards. Existing combiner box technology is insufficient in addressing this issue, making it difficult to accurately and efficiently manage the parallel operation of new and old batteries with different capacities, and thus unable to fully meet the needs of the continuous development of residential high-voltage energy storage systems. Utility Model Content

[0003] The main technical problem solved by this utility model is to provide a combiner box that can automatically adjust according to the difference in battery discharge, thereby reducing the impact of output fluctuations caused by the difference in charge of new and old batteries on the entire energy storage system during parallel operation.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A combiner box capable of automatically adjusting according to battery discharge differences is provided. The combiner box includes a box body, a box cover, a mounting base, and a connecting bracket. A ground wire connector is also provided at the bottom of the box body. A box body switch, multiple sets of current input interfaces, and a set of current output interfaces are arranged in parallel on the box body. A copper busbar is installed inside the box body. Each set of current input interfaces is connected to the copper busbar via a combiner circuit. The multiple combiner circuits are connected in parallel. Each combiner circuit has a relay and a diode connected in series. The relay and diode are connected in parallel to the copper busbar. A shunt is provided between the copper busbar and the current output interface. The box body also contains an EMS module and a DC-DC module connecting the copper busbar and the EMS module. The EMS module is connected to all relays respectively. The EMS module is connected to an external battery management module via an internal CAN bus. The EMS module is also connected to an external inverter module via an external CAN bus. The box body is provided with corresponding internal CAN bus communication interfaces and external CAN bus communication interfaces.

[0005] In a preferred embodiment of this utility model, the battery management module includes a battery module management unit (BMU) and a battery cluster management unit (BCU). Each battery cell is connected to one battery module management unit, and a group of multiple battery module management units can simultaneously communicate bidirectionally with one battery cluster management unit. The multiple battery cluster management units can simultaneously connect to the EMS module via an internal CAN bus.

[0006] In a preferred embodiment of this utility model, the EMS module, DC-DC module, copper busbar and shunt are arranged in sequence from top to bottom on the inner side of the back panel of the enclosure, and the relays and diodes of each bus circuit are arranged in parallel with the copper busbar.

[0007] In a preferred embodiment of this utility model, the enclosure switch, current input interface, current output interface, internal CAN bus communication interface, and external CAN bus communication interface are all located at the bottom of the enclosure.

[0008] In a preferred embodiment of the present invention, an antenna is also provided at the bottom of the housing.

[0009] In a preferred embodiment of the present invention, the back panel of the housing is provided with heat dissipation holes.

[0010] The beneficial effects of this utility model are as follows: Based on the existing combiner box structure, this utility model sets up an EMS module and a DC-DC module. The EMS module can accurately measure the total power fluctuation through the shunt and communicate with the battery management module in real time to determine the operating status of each battery group. By controlling the opening and closing of the corresponding relays based on the real-time status of each battery module, if a difference in capacity between new and old batteries is detected during parallel operation, the overall charging and discharging current can be adjusted in real time by controlling the opening and closing status of the corresponding relays, thereby achieving optimal control of the power and keeping the power output stable. This ensures the overall stability of the energy storage system and improves the overall service life of the energy storage system. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the present invention; Figure 2 This is a top view of the structure of the embodiment shown; Figure 3 This is a schematic diagram of the bottom view structure of the embodiment shown; Figure 4 This is a schematic diagram of the internal structure of the embodiment shown; The components in the attached diagram are labeled as follows: 1. Case body, 2. Case lid, 3. Hanging base, 4. Hanging rack; 101. EMS module, 102. DC-DC module, 103. Shunt, 104. Copper busbar, 105. Diode, 106. Relay, 107. Antenna, 108. Current output interface, 109. Current input interface, 1010. Enclosure switch, 1011. Internal CAN bus communication interface, 1012. External CAN bus communication interface, 1013. Ground connector. Detailed Implementation

[0012] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0013] Please see Figures 1 to 4 The embodiments of this utility model include: A combiner box capable of automatically adjusting according to battery discharge differences includes a box body 1, a cover 2, a mounting base 3, and a hanging bracket 4. The cover 2 covers the front of the box body 1, the hanging bracket 4 is fixed to the back plate of the box body 1, the mounting base 3 is fixed to the mounting position by screws, and the combiner box is hung on the mounting base 3 by the hanging bracket 4. The bottom of the box body 1 is also provided with a ground wire connector 1013. A box body switch 1010, three sets of current input interfaces 109, and one set of current output interfaces 108 are arranged in parallel on the box body 1. A copper busbar 104 is installed inside the box body 1. Each set of current input interfaces is provided with a combiner circuit between itself and the copper busbar 104. Multiple combiner circuits are connected in parallel. Each combiner circuit is connected in series with a relay 106 and a diode 105. A branch circuit is provided between the copper busbar 104 and the current output interface 108. The enclosure 1 also includes an EMS module 101 and a DC-DC module 102 connecting the copper busbar 104 and the EMS module 101. The EMS module 101, DC-DC module 102, copper busbar 104, and shunt 103 are arranged from top to bottom on the inner side of the back panel of the enclosure 1. The relays 106 and diodes 105 of the three bus circuits are arranged in parallel with the copper busbar 104. The EMS module 101 is communicatively connected to the shunt 103 and all the relays 106. The EMS module 101 is connected to the battery management module via an internal CAN bus and to the inverter module via an external CAN bus. The enclosure 1 is provided with corresponding internal CAN bus communication interfaces 1011 and external CAN bus communication interfaces 1012. The battery management module includes a Battery Module Management Unit (BMU) and a Battery Cluster Management Unit (BCU). Each battery cell is connected to one BMU, and multiple BMUs can simultaneously communicate bidirectionally with a single BCU. Multiple BCUs are also connected to the EMS module 101 via an internal CAN bus. In this way, the EMS module 101 and the BCUs together form a three-tiered management system. During operation, each BMU collects the temperature and voltage data of its corresponding battery cell in real time, summarizes the data, and transmits it to the corresponding BCU. The EMS module 101 assigns an address to each BCU, manages and summarizes data independently for each BCU via the internal CAN bus, and communicates with the inverter via an external CAN bus to exchange information. This achieves effective control over charging and discharging and enables the combiner box to perform current acquisition, high-voltage acquisition, SOC management, and overcharge protection functions.

[0014] The enclosure switch 1010, current input interface 109, current output interface 108, internal CAN bus communication interface 1011, and external CAN bus communication interface 1012 are all located at the bottom of the enclosure 1. Placing these structures at the bottom of the enclosure 1 can effectively prevent rainwater from affecting their normal function.

[0015] An antenna 107 is also provided at the bottom of the housing 1, and the antenna 107 is connected to the wireless transmission module inside the EMS module 101. By setting the antenna 107, data in the EMS module 101 can be wirelessly transmitted to the central computer and real-time instructions can be received from the central computer.

[0016] The back panel of the housing 1 is provided with heat dissipation holes, which can reduce the accumulation of internal heat during the use of the junction box and improve the service life of each module in the housing 1.

[0017] In practical applications, the combiner box can monitor the power of each battery cluster in real time through the EMS module 101 inside the box, and flexibly adjust the parallel operation strategy to match parameters such as remaining power. When a difference in capacity between new and old batteries is detected, the EMS module 101 can regulate the overall charging and discharging current by controlling the opening and closing of each relay 106, thereby achieving optimal power control and ensuring that the performance and lifespan of the energy storage system are in an ideal state.

[0018] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A combiner box capable of automatically adjusting according to differences in battery discharge, the combiner box comprising a box body, a box cover, a mounting base, and a connecting bracket, wherein the bottom of the box body is further provided with a ground wire connector, characterized in that, The enclosure features a parallel arrangement of an enclosure switch, multiple current input interfaces, and a current output interface. A copper busbar is installed inside the enclosure. Each current input interface is connected to the copper busbar via a busbar, and these busbars are connected in parallel. Each busbar has a relay and a diode connected in series. The relay and diode are then connected in parallel to the copper busbar. A shunt is installed between the copper busbar and the current output interface. The enclosure also contains an EMS module and a DC-DC converter module connecting the copper busbar and the EMS module. The EMS module is connected to all relays. The EMS module is connected to an external battery management module via an internal CAN bus and to an external inverter module via an external CAN bus. The enclosure has corresponding internal and external CAN bus communication interfaces.

2. The combiner box capable of automatically adjusting according to battery discharge differences according to claim 1, characterized in that, The battery management module includes a battery module management unit (BMU) and a battery cluster management unit (BCU). Each battery cell is connected to one battery module management unit, and multiple battery module management units can simultaneously communicate bidirectionally with one battery cluster management unit. Multiple battery cluster management units can simultaneously connect to the EMS module via an internal CAN bus.

3. The combiner box capable of automatically adjusting according to battery discharge differences according to claim 1, characterized in that, The EMS module, DC-DC module, copper busbar and shunt are arranged from top to bottom on the inner side of the back panel of the enclosure. The relays and diodes of each bus circuit are arranged in parallel with the copper busbar.

4. The combiner box capable of automatically adjusting according to battery discharge differences according to claim 1, characterized in that, The enclosure switch, current input interface, current output interface, internal CAN bus communication interface, and external CAN bus communication interface are all located at the bottom of the enclosure.

5. The combiner box capable of automatically adjusting according to battery discharge differences according to claim 1, characterized in that, An antenna is also installed at the bottom of the enclosure.

6. The combiner box capable of automatically adjusting according to battery discharge differences according to claim 1, characterized in that, The back panel of the enclosure is provided with heat dissipation holes.

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