Cascade type battery charging and replacing combined cabinet based on centralized energy storage structure

Abstract

The utility model provides a cascade type battery charging and swapping combined cabinet based on a centralized energy storage structure, which relates to the technical field of cascade type battery charging and swapping cabinets and comprises a plurality of battery charging and swapping cabinets and a centralized energy storage cabinet, one of the plurality of battery charging and swapping cabinets is a main cabinet, and the rest of the battery charging and swapping cabinets are auxiliary cabinets; and the charging power supply ends of the plurality of charging and swapping cabinets are connected together, and the plurality of charging and swapping cabinets are in communication connection through a field bus. The system further comprises a charging and discharging control circuit, an energy storage battery is arranged in the centralized energy storage cabinet, the centralized energy storage cabinet is connected with the charging and discharging control circuit, and the centralized energy storage cabinet is respectively connected with a mains supply and the charging power supply ends of the plurality of charging and swapping cabinets through the charging and discharging control circuit. The device is suitable for the structural design that a plurality of charging and swapping cabinets are arranged together, the space of the charging and swapping cabinets is not occupied while the economic benefit is improved, and the charging and discharging efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of cascade charging and swapping cabinets, and in particular to a cascade charging and swapping combined cabinet based on a centralized energy storage structure. Background Art

[0002] A charging and battery replacement cabinet is a cabinet that can store electric vehicle batteries and charge automatically. It usually has many battery compartments, each of which can store an electric vehicle battery. The electric vehicle battery can be charged and replaced through the display screen or QR code on the cabinet, providing fast and convenient battery charging and battery replacement services to people working in industries such as takeout and express delivery.

[0003] In the past, charging and swapping cabinets for electric vehicle batteries were in a single storage mode. Each charging and swapping cabinet in the single storage mode needs to have an empty battery compartment for charging and swapping, and the battery compartment cannot be full. If multiple charging and swapping cabinets are needed to be arranged together, there are too many empty battery compartments. In order to meet market demand, a design has emerged in which multiple charging and swapping cabinets are arranged together and electrically cascaded. For example, a Chinese patent with publication number CN 209955802 U proposes an electric vehicle intelligent charging cabinet cascade circuit, which controls multiple charging and swapping cabinets as a whole and only requires one empty battery compartment.

[0004] The general charging and swapping cabinets for electric vehicle batteries are not equipped with energy storage devices. If energy storage devices are equipped, the peak and valley electricity prices of the power grid can be utilized to improve economic benefits. In the disclosed prior art, there is a design in which energy storage batteries are arranged inside a separate charging and swapping cabinet. For example, a charging station energy storage cabinet and energy storage system proposed in the Chinese patent with publication number CN 111262141 A. This design occupies the space of the charging and swapping cabinet, which is not large, and is not suitable for use when multiple charging and swapping cabinets are arranged together. Based on this technical defect, it is necessary to design a centralized energy storage structure for the structure in which multiple charging and swapping cabinets are arranged together, reduce the space occupied by the charging and swapping cabinet itself, improve economic benefits while not occupying the space of the charging and swapping cabinet itself, and have high charging and discharging efficiency. Utility Model Content

[0005] In order to solve the technical problems in the background technology, the utility model provides a cascade charging and swapping combination cabinet based on a centralized energy storage structure, which is suitable for the structural design of arranging multiple charging and swapping cabinets together, while improving economic benefits without occupying the space of the charging and swapping cabinet itself, and has high charging and discharging efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A cascade charging and swapping combination cabinet based on a centralized energy storage structure includes multiple charging and swapping cabinets and a centralized energy storage cabinet, one of the multiple charging and swapping cabinets is a main cabinet, and the rest are auxiliary cabinets; the charging power supply ends of the multiple charging and swapping cabinets are connected together, and the multiple charging and swapping cabinets are connected through field bus communication.

[0008] It also includes a charge and discharge control circuit. The centralized energy storage cabinet is provided with an energy storage battery. The centralized energy storage cabinet is connected to the charge and discharge control circuit, which is respectively connected to the mains power supply and the charging power supply terminals of multiple charging and swapping cabinets through the charge and discharge control circuit.

[0009] Furthermore, the charge and discharge control circuit includes an AC-DC charger, a charging switch, a DC-AC inverter, and a discharging switch. The charge and discharge control circuit is provided with a mains port connected to the mains power supply, and the mains port is connected to the input end of the AC-DC charger through the charging switch; the output end of the AC-DC charger is connected to the energy storage battery in the centralized energy storage cabinet, and the mains port is also connected to the output end of the DC-AC inverter through the discharging switch, and the input end of the DC-AC inverter is connected to the energy storage battery in the centralized energy storage cabinet; the output end of the DC-AC inverter is connected to the charging power supply ends of multiple charging and swapping cabinets. When the charging switch is closed and the discharging switch is disconnected, the mains charges the energy storage battery. When the charging switch is disconnected and the discharging switch is closed, the energy storage battery is discharged and inverted into AC output, which serves as the charging power supply for multiple charging and swapping cabinets.

[0010] Furthermore, the centralized energy storage cabinet is provided with a plurality of energy storage batteries, the charge and discharge control circuit also includes a plurality of battery independent control switches, and a battery independent control switch is connected between each energy storage battery and the output end of the AC-DC charger and the input end of the DC-AC inverter.

[0011] Furthermore, the charge and discharge control circuit also includes a check diode, which is connected between the energy storage battery and the input end of the DC-AC inverter.

[0012] Furthermore, the charge and discharge control circuit also includes a CPU, which is communicatively connected to the AC-DC charger and the energy storage battery in the centralized energy storage cabinet, and is used to read the BMS information of the energy storage battery and perform charging control on it.

[0013] Furthermore, the field bus is a CAN bus.

[0014] Furthermore, a cloud server is also included, and a main cabinet among the multiple charging and swapping cabinets is communicatively connected to the cloud server.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1) The utility model is a cascade charging and swapping combination cabinet based on a centralized energy storage structure. A centralized energy storage cabinet is separately arranged outside multiple charging and swapping cabinets. It is suitable for the structural design of arranging multiple charging and swapping cabinets together, which improves the economic benefits while not occupying the space of the charging and swapping cabinet itself, and has high charging and discharging efficiency.

[0017] 2) The cascade charging and swapping combination cabinet designed in the utility model adopts a one-master-multiple-subsidiary solution, and field bus communication is used between the main and sub cabinets to control multiple charging and swapping cabinets as a whole, which can effectively reduce empty warehouses and improve the utilization rate of the charging and swapping cabinets.

[0018] 3) The charging and discharging control circuit designed in the utility model connects the energy storage battery in the centralized energy storage cabinet to the input of the DC-AC inverter. The output of the DC-AC inverter serves as the energy storage power source for charging the batteries of multiple charging and swapping cabinets. The centralized energy storage cabinet charges and stores energy during the off-peak period of the mains power, and automatically starts to operate during the peak period of the mains power or in the event of a mains power failure, thereby ensuring the reliable operation of the system while also reducing operating costs.

[0019] 4) The charge and discharge control circuit designed by the utility model has simple functions, reasonable design, reliable and safe charge and discharge. The charge and discharge control circuit can be placed in a centralized energy storage cabinet or separately without restriction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an overall structural diagram of a cascaded charging and swapping combination cabinet based on a centralized energy storage structure of the utility model;

[0021] Figure 2 It is an electrical structure diagram of the charge and discharge control circuit of the utility model. DETAILED DESCRIPTION

[0022] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0023] Embodiment 1

[0024] like Figure 1 As shown, this embodiment provides a cascade charging and swapping combination cabinet based on a centralized energy storage structure, including multiple charging and swapping cabinets and a centralized energy storage cabinet, one of the multiple charging and swapping cabinets is a main cabinet, and the rest are auxiliary cabinets; the charging power supply ends of the multiple charging and swapping cabinets are connected together, and the multiple charging and swapping cabinets are connected through field bus communication.

[0025] It also includes a charge and discharge control circuit, wherein a centralized energy storage cabinet is provided with an energy storage battery ( Figure 2 BAT1-BATn in the figure), the centralized energy storage cabinet is connected to the charge and discharge control circuit, and is respectively connected to the mains power supply and the charging power supply terminals of multiple charging and swapping cabinets through the charge and discharge control circuit.

[0026] In this embodiment, the field bus adopts a CAN bus. In this embodiment, a cloud server is also included, and the main cabinet of the multiple charging and swapping cabinets is communicatively connected with the cloud server.

[0027] The cascaded charging and swapping combination cabinet of the utility model can effectively reduce empty warehouses and improve the utilization rate of the charging and swapping cabinets. The combination cabinet adopts a one-master-multiple-sub cabinet solution, and the main and sub cabinets use CAN bus communication. The main cabinet uses polling to collect cabinet, warehouse and battery information of the sub cabinet in real time and report it to the cloud. When the cabinet, warehouse and battery information changes, the sub cabinet actively sends the information to the main cabinet, and the main cabinet immediately reports it to the cloud, thereby fully meeting the real-time information requirements of the charging and swapping combination cabinet.

[0028] The centralized energy storage cabinet charges and stores energy during the off-peak period of the mains power, and automatically starts to work during the peak period of the mains power or in the event of a mains power failure, which ensures the reliable operation of the system while reducing operating costs. A centralized energy storage cabinet is set up separately outside multiple charging and swapping cabinets, which is suitable for the structural design of arranging multiple charging and swapping cabinets together, which improves economic benefits while not occupying the space of the charging and swapping cabinet itself, and has high charging and discharging efficiency.

[0029] Embodiment 2

[0030] This embodiment provides a charge and discharge control circuit based on the first embodiment.

[0031] The charge and discharge control circuit described in the utility model can adopt the charge and discharge control circuit of the prior art, or the charge and discharge control circuit provided by this embodiment, which has simple functions, reasonable design, reliable and safe charge and discharge. The charge and discharge control circuit can be placed in a centralized energy storage cabinet or separately, without limitation.

[0032] like Figure 2 As shown, the charge and discharge control circuit designed in this embodiment includes an AC-DC charger, charging switches KL1 and KN1, a DC-AC inverter, and discharge switches KL2 and KN2. The charge and discharge control circuit is provided with a mains port ( Figure 2 The AC power port is connected to the input of the AC-DC charger through the charging switches KL1 and KN1; the output of the AC-DC charger is connected to the energy storage batteries BAT1-BATn in the centralized energy storage cabinet, and the AC power port is also connected to the output of the DC-AC inverter through the discharge switches KL2 and KN2, and the input of the DC-AC inverter is connected to the energy storage batteries BAT1-BATn in the centralized energy storage cabinet; the output of the DC-AC inverter is the output of the charge and discharge control circuit, which is connected to the charging power supply of multiple charging and swapping cabinets.

[0033] The circuit principle of the charge and discharge control circuit is: when the charging switches KL1 and KN1 are closed and the discharging switches KL2 and KN2 are opened, the AC power supply charges the energy storage batteries BAT1-BATn through the AC-DC charger. On the contrary, the energy storage batteries BAT1-BATn are discharged and inverted into AC output through the DC-AC inverter, which serves as the charging power supply for multiple charging and swapping cabinets.

[0034] The charging switch and the discharging switch in this embodiment are implemented by relays, the charging switches KL1 and KN1 use the normally open contacts of the charging relays, and the discharging switches KL2 and KN2 use the normally closed contacts of the discharging relays. The charging switch and the discharging switch may also use thyristor-type controllable switch devices, and the charging and discharging control circuit of this embodiment also includes a CPU, and the actions of the relays or controllable switch devices are controlled by the CPU.

[0035] Figure 2 An overcurrent protector F1 is provided in the charge and discharge control circuit for discharge overcurrent protection.

[0036] Furthermore, there may be multiple energy storage batteries in the centralized energy storage cabinet, and multiple energy storage batteries are connected in parallel as energy storage units. When multiple energy storage batteries are provided in the centralized energy storage cabinet, the charge and discharge control circuit of this embodiment further includes multiple battery independent control switches K1-Kn, and each energy storage battery is connected to the output end of the AC-DC charger and the input end of the DC-AC inverter with a battery independent control switch K1-Kn. The battery independent control switches K1-Kn can independently control the charge and discharge of the battery.

[0037] Furthermore, the charge and discharge control circuit of this embodiment further includes a non-reverse diode D1-Dn, which is connected between the energy storage batteries BAT1-BATn and the input end of the DC-AC inverter. The non-reverse diode D1-Dn is used to prevent the energy storage batteries with high power in the centralized energy storage cabinet from reversely charging the energy storage batteries with low power in the energy storage cabinet.

[0038] Furthermore, the CPU of this embodiment is connected to the AC-DC charger and the energy storage battery in the centralized energy storage cabinet via RS485 communication, so as to read the BMS information of the energy storage battery and control its charging. The BMS information of the battery is accessed and read via RS485, and the control of the AC-DC charger is achieved by sending commands and reading data via the RS485 communication port.

[0039] In this embodiment, the CPU of the charging and discharging control circuit can also be connected to the CAN bus, and the main cabinet charging and swapping cabinet and the cloud server are connected through the CAN bus, so that the charging and discharging of the energy storage battery can be controlled by the local device or through the cloud server.

[0040] The charging and discharging control circuit designed by the utility model connects all the energy storage batteries in the centralized energy storage cabinet in series with the check diode and then in parallel to the input of the DC-AC inverter. The output of the DC-AC inverter serves as the energy storage power source for charging the batteries of multiple charging and swapping cabinets. The centralized energy storage cabinet charges and stores energy during the off-peak period of the mains power, and is automatically put into operation during the peak period of the mains power or in the event of a mains power failure, thereby ensuring the reliable operation of the system while also reducing the operating cost.

[0041] The above embodiments are implemented on the premise of the technical solution of the utility model, and detailed implementation methods and specific operation processes are given, but the protection scope of the utility model is not limited to the above embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A cascade charging and swapping combination cabinet based on a centralized energy storage structure, characterized in that: It includes multiple charging and swapping cabinets and a centralized energy storage cabinet, wherein one of the multiple charging and swapping cabinets is a main cabinet, and the rest are auxiliary cabinets; the charging power supply ends of the multiple charging and swapping cabinets are connected together, and the multiple charging and swapping cabinets are connected through field bus communication; It also includes a charge and discharge control circuit. The centralized energy storage cabinet is provided with an energy storage battery. The centralized energy storage cabinet is connected to the charge and discharge control circuit, and the charging power supply terminals of the mains power supply and multiple charging and swapping cabinets are respectively connected through the charge and discharge control circuit; The charge and discharge control circuit includes an AC-DC charger, a charging switch, a DC-AC inverter, and a discharging switch. The charge and discharge control circuit is provided with a mains port connected to the mains power supply, and the mains port is connected to the input end of the AC-DC charger through the charging switch; the output end of the AC-DC charger is connected to the energy storage battery in the centralized energy storage cabinet, and the mains port is also connected to the output end of the DC-AC inverter through the discharging switch, and the input end of the DC-AC inverter is connected to the energy storage battery in the centralized energy storage cabinet; the output end of the DC-AC inverter is connected to the charging power supply ends of multiple charging and swapping cabinets. When the charging switch is closed and the discharging switch is disconnected, the mains power supply charges the energy storage battery. When the charging switch is disconnected and the discharging switch is closed, the energy storage battery is discharged and inverted into AC output, which serves as the charging power supply for multiple charging and swapping cabinets.

2. According to claim 1, a cascade charging and swapping combined cabinet based on a centralized energy storage structure is characterized in that: The centralized energy storage cabinet is provided with a plurality of energy storage batteries, and the charge and discharge control circuit further comprises a plurality of independent battery control switches, and an independent battery control switch is connected between each energy storage battery and the output end of the AC-DC charger and the input end of the DC-AC inverter.

3. According to claim 1, a cascade charging and swapping combined cabinet based on a centralized energy storage structure is characterized in that: The charge and discharge control circuit further includes a check diode connected between the energy storage battery and the input end of the DC-AC inverter.

4. The cascaded charging and swapping combined cabinet based on a centralized energy storage structure according to claim 1 is characterized in that: The charge and discharge control circuit also includes a CPU, which is connected to the AC-DC charger and the energy storage battery in the centralized energy storage cabinet for communication, and is used to read the BMS information of the energy storage battery and perform charging control on it.

5. The cascaded charging and swapping combined cabinet based on a centralized energy storage structure according to claim 1 is characterized in that: The field bus is a CAN bus.

6. The cascaded charging and swapping combined cabinet based on a centralized energy storage structure according to claim 1 is characterized in that: It also includes a cloud server, and the main cabinet among the multiple charging and swapping cabinets is communicatively connected to the cloud server.

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