Energy storage parallel operation device

Abstract

The utility model discloses an energy storage parallel operation device which comprises a battery system, a confluence box and a PCS, and the confluence box is electrically connected with the battery system and the PCS respectively. The battery system comprises more than two batteries, each battery comprises a BMS (battery management system), a first parallel operation communication interface and a second parallel operation communication interface, the confluence box is provided with a busbar and a first butting connector, and the positive electrode and the negative electrode of each battery are respectively connected to the corresponding busbar of the confluence box; and the parallel operation communication interfaces of the batteries are connected in parallel and then are connected to the first butting connector together with the busbar. The battery systems are connected in parallel through the confluence boxes, the number of batteries in the battery systems can be changed according to actual needs during use, the confluence boxes are directly connected with the PCS, compared with a management system in which the battery systems are directly connected with the PCS, the signal management is more convenient, the connection scheme is simple and clear, the operation is relatively simple, the integration degree is relatively high, and the cost is low. And management is facilitated.

Description

Technical Field

[0001] The utility model relates to an energy storage parallel machine device, belonging to the field of new energy. Background Art

[0002] With the development of new energy technologies, the field of electrochemical energy storage is in a stage of explosive growth. At the current stage of the continuous growth of electricity demand, the volatility of renewable energy generation, and the lagging construction of grid elastic regulation capabilities, electrochemical energy storage devices have become an important solution tool for maintaining the balance of electricity supply and demand and ensuring the stability of the power system in the energy storage system. Whether it is an industrial power storage method used to achieve peak-valley arbitrage, capacity management, and dynamic capacity expansion, or a user energy storage system used to build a photovoltaic system to avoid the impact of the urban power supply system, the capacity of its battery management system is a very important factor, and the existing capacity management system is often very large in size, not very flexible in assembly, and very inconvenient in use. Utility Model Content

[0003] In order to solve the technical problems of the existing battery capacity management system in the above-mentioned background technology being too large and inconvenient to assemble, the utility model provides an energy storage parallel device, which realizes a high degree of integration of the electric energy storage system by connecting batteries in parallel including BMS and a docking connector and a PCS, so that the number of battery packs can be replaced as needed during use, which is more convenient to operate than the existing energy storage management system; in addition, each connecting component in the utility model is made of waterproof material, which has better waterproof performance than the general energy storage system, and can widely cover the waterproof performance requirements for indoor and outdoor use in actual application scenarios.

[0004] The technical solution to achieve the purpose of this utility model is:

[0005] An energy storage parallel device includes a battery system, a junction box and a PCS, wherein the junction box is electrically connected to the battery system and the PCS respectively; the battery system includes more than two batteries, each battery includes a BMS and a first parallel communication interface and a second parallel communication interface, the junction box is provided with a bus and a first docking connector, the positive and negative poles of the batteries are respectively connected to the corresponding buses of the junction box, and the first parallel communication interface and the second parallel communication interface of each battery are connected in parallel and connected to the first docking connector together with the bus.

[0006] The utility model adopts a junction box to connect the battery system in parallel. When in use, the number of batteries in the battery system can be replaced according to actual needs. The junction box is directly connected to the PCS. Compared with the management system in which the battery system is directly connected to the PCS, its signal management is more convenient.

[0007] Furthermore, after the power supply circuits and communication circuits of multiple battery systems are connected to the junction box in parallel, the parallel connection is completed through the docking connector on the junction box and the wiring harness thrown out by the PCS through the connector. The multiple battery systems after parallel connection collect system information through their respective BMSs and transmit it to the PCS through the communication parallel circuit. The PCS obtains information of all parallel battery systems. When the battery system needs to be charged or discharged, the PCS sends corresponding instructions to the BMS of all battery systems participating in the parallel connection through the communication circuit, and charges and discharges the multiple battery systems participating in the parallel connection through the parallel power supply circuit. This connection scheme is concise and clear, the operation is relatively simple, the integration is relatively high, and it is easy to manage.

[0008] Furthermore, a second docking connector is provided between the junction box and the PCS, so that when the capacity of a single group of energy storage parallel devices is insufficient, multiple groups can be connected in parallel for expansion.

[0009] Furthermore, the battery system, junction box and PCS are electrically connected by a wiring harness, which is more flexible than a fixed connection during the connection and disconnection process.

[0010] Furthermore, the battery system also includes an energy management system to enhance the overall system intelligence of the device.

[0011] Furthermore, the battery system and junction box have a waterproof rating of IP65 or above.

[0012] Furthermore, the first docking connector and the second docking connector have a waterproof rating of IP67 or above.

[0013] The above settings can ensure that the overall system after parallel operation can achieve a waterproof performance of IP65 or above, covering the waterproof performance requirements for indoor and outdoor use in actual application scenarios.

[0014] By adopting the above technical solution, the utility model has the following beneficial effects:

[0015] (1) The utility model adopts a junction box to connect the battery system in parallel. When in use, the number of batteries in the battery system can be replaced according to actual needs. The junction box is directly connected to the PCS. Compared with the management system in which the battery system is directly connected to the PCS, its signal management is more convenient. The junction box and the docking connector are used to sort out the circuit and signal, and the multiple battery systems participating in the parallel operation are charged and discharged through the power supply circuit of the parallel operation. This connection scheme is concise and clear, the operation is relatively simple, the integration is relatively high, and it is easy to manage.

[0016] (2) A second docking connector is also provided between the junction box of the utility model and the PCS, so that when the capacity of a single group of energy storage parallel devices is insufficient, multiple groups can be connected in parallel for expansion.

[0017] (3) The battery system, junction box and PCS of the utility model are electrically connected by a wiring harness, which is more flexible than a fixed connection during the disconnection process.

[0018] (4) The utility model also includes an energy management system, and the overall system intelligence of the device is better than other small-scale energy storage parallel devices.

[0019] (5) Each component of the utility model has a waterproof rating of IP65 or above, and each docking connector has a waterproof rating of IP67 or above, which can ensure that the overall system after parallel operation has a waterproof performance of IP65 or above, covering the waterproof performance requirements for indoor and outdoor use in actual application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the connection relationship of the utility model.

[0022] The reference numerals in the drawings are: battery system 1 , first parallel communication interface 11 , second parallel communication interface 12 , junction box 2 , bus bar 21 , first docking connector 22 , PCS 3 , second docking connector 4 . DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0028] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0029] (Example 1)

[0030] See Figure 1 The energy storage parallel device of this embodiment includes three parts: a battery system 1, a junction box 2, and a PCS3. The battery system includes P+ and P- external interfaces of the power supply circuit, and a parallel communication interface 1 and a parallel communication interface 2 of the parallel communication circuit; the junction box 2 includes a positive bus bar, a negative bus bar, and a first docking connector electrically connected to the battery system 1 and PCS3, and then the junction box 2 is connected to the PCS2 through a second docking connector.

[0031] The positive and negative power supply circuits of the battery system 1 are connected through Figure 1The P+ and P- interfaces are connected to the positive bus and negative bus of the junction box 2 respectively using a wiring harness in parallel, wherein the P+ circuit of each battery system 1 is connected to the positive bus of the junction box 2, and the P- circuit connector of each battery system 1 is connected to the negative bus of the junction box 2. Then the positive bus of the junction box 2 is connected to the first docking connector 22 through the wiring harness, and the negative bus of the junction box 2 is connected to the first docking connector 22 through the wiring harness. The first docking connector 4 is fixed to the outer shell of the junction box 2. Finally, the first docking connector 22 of the junction box 2 is connected to the wiring harness of the PCS3 and the second docking connector 4 to complete the parallel connection of the power circuit.

[0032] Communication circuit parallel connection: the first parallel communication interface 11 of the last battery system N of the battery system 1 is connected to the second parallel communication interface 12 of the next battery system 1 through the communication harness, and the above connection method is repeated to complete the communication connection of each battery system 1 to the second parallel communication interface 12 of the battery system 1 in turn, and the first parallel communication interface 11 of the battery system 1 is connected to the first docking connector 22 on the junction box 2, and finally the communication parallel connection is completed by docking with the second docking connector 4 of PCS2.

[0033] After the connection is completed in the above manner, the multiple battery systems 1 can realize the parallel operation of the power supply circuit and the communication circuit, and finally realize the parallel operation between the multiple battery systems 1 and the PCS 3.

[0034] After the power supply circuit and communication circuit of multiple battery systems 1 are connected to the junction box 2 in parallel, the first docking connector 11 on the junction box 2 and the harness thrown out of PCS2 are connected through the second pair of connectors 4 to complete the parallel connection. The multiple battery systems 1 after the parallel connection are further completed. The system information collected by each BMS is transmitted to PCS3 through the communication parallel circuit, and PCS3 obtains the information of all parallel battery systems 1. When the battery system 1 needs to be charged or discharged, PCS3 sends the corresponding command to the BMS of all battery systems 1 participating in the parallel connection through the communication circuit, and charges and discharges the multiple battery systems 1 participating in the parallel connection through the power supply circuit of the parallel connection.

[0035] To ensure the waterproof effect, the above components have a waterproof grade of IP65 or above, and each docking connector has a waterproof grade of IP67 or above.

[0036] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy storage parallel device, characterized in that: The invention comprises a battery system (1), a junction box (2) and a PCS (3), wherein the junction box (2) is electrically connected to the battery system (1) and the PCS (3) respectively; the battery system (1) comprises more than two batteries, each battery comprises a BMS and a first parallel communication interface (11) and a second parallel communication interface (12); the junction box (2) is provided with a bus (21) and a first docking connector (22); the positive and negative electrodes of the batteries are respectively connected to the corresponding bus (21) of the junction box (2); the first parallel communication interface (11) and the second parallel communication interface (12) of each battery are connected in parallel with the bus (21) and are connected to the first docking connector (22) together.

2. The energy storage parallel device according to claim 1, characterized in that: A second docking connector (4) is also provided between the junction box (2) and the PCS (3).

3. An energy storage parallel device according to any one of claims 1 to 2, characterized in that: The battery system (1), junction box (2) and PCS (3) are electrically connected by a wiring harness.

4. An energy storage parallel device according to any one of claims 1 to 2, characterized in that: The battery system (1) also comprises an energy management system.

5. The energy storage parallel device according to claim 4, characterized in that: The battery system (1) and junction box (2) have a waterproof rating of IP65 or above.

6. The energy storage parallel device according to claim 2, characterized in that: The first docking connector (22) and the second docking connector (4) have a waterproof rating of IP67 or above.

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