Energy storage charging system

Abstract

The utility model relates to the technical field of electric automobile energy storage and charging, in particular to an energy storage and charging system, which not only charges an electric automobile in a direct current to direct current mode and improves the charging efficiency, but also has the functions of direct current discharging and alternating current and direct current charging, and is extremely convenient to use. The charging control module is combined with the state of the energy storage battery to adjust the output voltage and current of the power module, the charging function of the electric automobile can be completed, the display screen can control the charging process through touch signal sending operation and display the information of the energy storage battery, and compared with the prior art, the charging efficiency is higher, and the practicability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle energy storage and charging, in particular to an energy storage and charging system. Background Art

[0002] As the world pays more attention to environmental protection, electric vehicles have gradually replaced pure fuel vehicles in our lives with their more environmentally friendly travel methods. However, the surge in electric vehicles has also led to the charging infrastructure being unable to fully meet the demand in some areas and occasions, and electric vehicles are increasingly running out of power on the road.

[0003] Existing road rescue energy storage charging equipment usually uses a DC to AC and then DC to charge vehicles. This not only increases the intermediate energy conversion steps, but also reduces the efficiency of power application. In addition, the power replenishment operation after the system power is used up is often connected to three-phase AC for charging. Not only is the operation complicated, it also requires professional power maintenance personnel to complete, and the operation and maintenance cost is high. Utility Model Content

[0004] The technical problem solved by the utility model is that the energy conversion efficiency of the DC-to-AC-to-DC mode of the energy storage charging equipment currently used for road rescue is low.

[0005] The basic solution provided by the utility model is: an energy storage charging system, including a box; a battery management system, a high-voltage battery pack, a DC-DC power module and a charging control module are arranged in the box, and a charging gun is arranged on the box; the high-voltage battery pack includes a plurality of single battery management units, and the output voltage of the high-voltage battery pack is not less than 180V;

[0006] The output end of the high-voltage battery pack is electrically connected to the input end of the DC-DC power module, and the output end of the DC-DC power module is electrically connected to the charging gun;

[0007] The charging control module is used to obtain the currently allowed discharge parameters according to the battery status information and control the charging output of the charging gun; the battery management system is used to control the charging and discharging amount, and the DC-DC power module is used to convert the DC power stored in the battery pack into DC power for charging the electric vehicle.

[0008] Furthermore, the positive line and the negative line of the output end of the high-voltage battery pack are electrically connected to the battery management system through a total positive contactor and a total negative contactor respectively.

[0009] Furthermore, the positive line and the negative line at the output end of the DC-DC power module are respectively provided with relays electrically connected to the charging control module, and the relays are opened and closed according to the signal of the charging control module.

[0010] Furthermore, it also includes a display screen, which is electrically connected to the CAN bus of the battery management system and sends a charging start and stop signal to the charging control module through the display screen.

[0011] Furthermore, the charging control module is also electrically connected to an emergency stop switch, and the charging control module controls the opening and closing of the relay according to an emergency interruption signal sent by the emergency stop switch.

[0012] Furthermore, it also includes a DC-DC 200 / 12V direct current converter, the input end of the DC-DC 200 / 12V direct current converter is electrically connected to the output end of the battery pack and a manual switch is provided between its lines, the output end of the DC-DC 200 / 12V direct current converter is electrically connected to the wake-up interface of the battery management system and one end of the start switch, and the other end of the start switch is electrically connected to the DC-DC power module, the display screen, and the charging control module; the DC-DC 200 / 12V direct current converter is used to convert the high-voltage current of the battery pack into a 12V low-voltage current to power the system.

[0013] Furthermore, it also includes an AC charger, the output end of which is electrically connected to the input end of the battery pack, and the AC charger is used to convert household AC power into DC power to supplement the system.

[0014] The principle and advantage of the utility model are: the scheme provides an energy storage charging system, which can use the high-voltage direct current of the high-voltage battery pack to charge the electric vehicle, directly convert the high-voltage direct current of the battery pack into direct current for the electric vehicle by converting direct current into direct current, with high energy conversion efficiency, saving the AC conversion step of converting direct current into alternating current and then into direct current in the prior art, and facilitating the on-board energy storage charging system to charge and rescue road vehicles. The scheme also monitors the state of the battery pack to automatically control the discharge process of the battery pack, which not only achieves a high conversion efficiency of converting direct current into direct current, but also makes the operation convenient and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a circuit structure diagram of an energy storage charging system embodiment. DETAILED DESCRIPTION

[0016] The following is further described in detail through specific implementation methods:

[0017] The specific implementation process is as follows:

[0018] Embodiment 1

[0019] This embodiment provides an energy storage charging system, including a box, in which a battery management system (BMS), a high-voltage battery pack, a DC-DC power module and a charging control module are arranged. A display screen and a charging gun are arranged on the box. The circuit schematic diagram is shown in the attached Figure 1 As shown. The high-voltage battery pack includes several single-cell battery management units, and the output voltage of the high-voltage battery pack is not less than 180V. The hardware structure of the battery management system is usually divided into a high-voltage area and a low-voltage area. The function of the high-voltage area is mainly concentrated on the direct monitoring and management of the high-voltage battery pack. It is mainly responsible for the collection of single-cell battery voltages, monitoring the total voltage of the entire high-voltage battery pack, and evaluating the overall state of the high-voltage battery pack to prevent electrical failures or safety accidents. The low-voltage area includes the electronic control unit and other auxiliary circuits of the battery management system BMS, which mainly provides a stable low-voltage power supply for the battery management system (BMS), and is responsible for data processing and execution of control algorithms and communication information exchange.

[0020] In this embodiment, the output end of the high-voltage battery pack is electrically connected to the input end of the DC-DC power module to provide a 200V power supply voltage, and the output end of the DC-DC power module is electrically connected to a charging gun, which is used to connect an electric vehicle. Among them, the positive and negative lines at the output end of the high-voltage battery pack are electrically connected to the battery management system through the total positive contactor M1 and the total negative contactor M2, respectively, and the total positive contactor M1 and the total negative contactor M2 are opened and closed according to the signal of the battery management system. The positive and negative lines at the output end of the DC-DC power module are electrically connected to the charging control module through the switch path of relay K1 and the switch path of relay K2, respectively, and relay K1 and relay K2 are opened and closed according to the signal of the charging control module.

[0021] The battery management system is electrically connected to the charging control module, four single battery management units, DCDC power module, and display screen through the CAN bus. The charging control module is connected to the charging gun through the charging CAN. After the charging gun is connected to the electric vehicle, it sends a CC signal to the charging control module through the charging CAN. The single battery management unit in this embodiment is used to collect the system current signal, and the battery management system is used to control the charge and discharge amount according to the current signal. The charging control module is also electrically connected to an emergency stop switch, which sends an emergency interrupt signal through the emergency stop switch.

[0022] In addition, this embodiment also includes a DC-DC 200 / 12V direct current converter, the input end of the DC-DC 200 / 12V direct current converter is electrically connected to the output end of the battery pack and a manual switch is provided between its lines, the output end of the DC-DC 200 / 12V direct current converter is electrically connected to the wake-up interface of the battery management system and one end of the start switch, and the other end of the start switch is electrically connected to the DC-DC power module, the display screen, and the charging control module; the DC-DC 200 / 12V direct current converter is used to convert the high-voltage current of the battery pack into a 12V low-voltage current to power the system.

[0023] In specific implementation, the battery management system collects the status of the energy storage system through four single-cell battery management units, and uses a shunt to collect the current on the energy storage system side, so that the energy storage system can calculate the charge and discharge amount. When the system closes the manual switch, the battery management system is awakened and the battery management system is always powered. After the start switch is closed, the energy storage system is powered on. The battery management system closes the total negative contactor M2 and the total positive contactor M1 according to the working status of the single-cell battery monitored by the single-cell battery management unit, completes the power-on operation on the energy storage system side and sends the monitored battery status information on the CAN bus. The charging control module collects and judges the information uploaded by the battery management system, calculates the status of the energy storage system to obtain the currently allowed discharge parameters, and the display screen can control the start and stop of the system's external charging. The DCDC power module can convert the stored DC power into DC power for charging electric vehicles to charge the on-board batteries of electric vehicles.

[0024] In addition, this solution also includes an AC charger, which is used to convert household AC power into DC power to supplement the system when the stored power is insufficient. When the charging system is connected to an AC charging socket, the AC charger receives the CC1 signal and sends a charging request signal to the CAN bus. The battery management system then controls the closing of the total positive relay and the total negative relay according to the charging request signal and sends a charging permission instruction to the AC charger. The AC charger feeds back the charging status, and the battery management system controls the total positive relay and the total negative relay based on the feedback.

[0025] This solution is not only based on high-voltage direct current, but also uses direct current to direct current to charge electric vehicles, which improves charging efficiency. It also has the functions of direct current discharge to the outside and alternating current to charge it, which is extremely convenient to use. The charging control module adjusts the output voltage and current of the power module in combination with the state of the energy storage battery, which can complete the charging function of the electric vehicle. The display screen can also control the charging process and display the information of the energy storage battery through touch signal transmission, which has obvious advantages over the existing technology.

[0026] The above are only embodiments of the utility model. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. An energy storage charging system, characterized in that: It includes a box; the box is provided with a battery management system, a high-voltage battery pack, a DC-DC power module and a charging control module, and the box is provided with a charging gun; the high-voltage battery pack includes a plurality of single battery management units, and the output voltage of the high-voltage battery pack is not less than 180V; The output end of the high-voltage battery pack is electrically connected to the input end of the DC-DC power module, and the output end of the DC-DC power module is electrically connected to the charging gun; The charging control module is used to obtain the currently allowed discharge parameters according to the battery status information and control the charging output of the charging gun; the battery management system is used to control the charging and discharging amount, and the DC-DC power module is used to convert the DC power stored in the battery pack into DC power for charging the electric vehicle.

2. An energy storage charging system according to claim 1, characterized in that: The positive and negative lines at the output end of the high-voltage battery pack are electrically connected to the battery management system through a total positive contactor and a total negative contactor, respectively.

3. An energy storage charging system according to claim 2, characterized in that: The positive and negative lines at the output end of the DC-DC power module are respectively provided with relays electrically connected to the charging control module, and the relays are opened and closed according to the signal of the charging control module.

4. An energy storage charging system according to claim 3, characterized in that: It also includes a display screen, which is electrically connected to the CAN bus of the battery management system and sends a charging start and stop signal to the charging control module through the display screen.

5. An energy storage charging system according to claim 4, characterized in that: The charging control module is also electrically connected to an emergency stop switch, and the charging control module controls the opening and closing of the relay according to an emergency interruption signal sent by the emergency stop switch.

6. An energy storage charging system according to claim 5, characterized in that: It also includes a DC-DC 200 / 12V direct current converter, the input end of the DC-DC 200 / 12V direct current converter is electrically connected to the output end of the battery pack and a manual switch is provided between the lines, the output end of the DC-DC 200 / 12V direct current converter is electrically connected to the wake-up interface of the battery management system and one end of the start switch, and the other end of the start switch is electrically connected to the DC-DC power module, the display screen, and the charging control module; The DC-DC 200 / 12V DC converter is used to convert the high voltage current of the battery pack into a low voltage current of 12V to power the system.

7. An energy storage charging system according to claim 6, characterized in that: It also includes an AC charger, the output end of which is electrically connected to the input end of the battery pack, and the AC charger is used to convert household AC power into DC power to supplement the system.

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