Photovoltaic controller and parallel matching battery management device

Abstract

The utility model discloses a kind of photovoltaic controller parallel matching battery management equipment, it is related to new energy technology field, comprising: battery management system;Photovoltaic controller, it is equipped with multiple, the output end of multiple photovoltaic controller is electrically connected to the input end of battery management system;CAN communication module.The photovoltaic controller parallel matching battery management equipment, by the use of CAN communication module, the working operating state of battery pack can be obtained, then adjust the output current of each photovoltaic controller in parallel system, to reach the best charging output current, realize the stable parallel operation of multiple controller system, current control, to ensure that the reasonable distribution of current stress and thermal stress between module, the photovoltaic controller parallel matching battery management equipment can effectively utilize photovoltaic energy, improve the utilization of photovoltaic panel, increase income, initiative and passive combination protect the safety of lithium battery, increase the service life of lithium battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically a photovoltaic controller parallel matching battery management device. Background Technology

[0002] With the continued growth of global demand for renewable energy, photovoltaic (PV) power generation systems, as an important green energy solution, are being used more and more widely. In PV power generation systems, PV controllers play an important role. With the development of the energy storage field, the demand for large-capacity energy storage systems is increasing, which inevitably puts higher demands on PV controllers. Parallel connection of multiple units to increase output power is a popular direction for expanding the application scenarios of PV controllers.

[0003] With the development of energy storage technology, a single photovoltaic controller in a high-power energy storage system cannot meet the power requirements. In this case, photovoltaic controller parallel technology is required, which has many advantages such as capacity expansion and improved maintainability. However, parallel connection can lead to instability between systems. If not handled properly, it can reduce the lifespan or damage the energy storage battery. Conventional multi-machine parallel connection is achieved through dry node control. There is no data exchange between systems. They can only follow the commands of the energy storage lithium battery to perform simple start and stop charging operations. Furthermore, there is no communication between the controllers, so they cannot obtain the operating parameters and status of other controllers. The current output is independent, which can easily lead to a mismatch between the system current and the battery demand current, causing damage to the energy storage battery.

[0004] To address the aforementioned issues, a photovoltaic controller parallel matching battery management device is needed to improve the matching of charging current output and the utilization rate of photovoltaic energy, resolve the instability problem of the parallel system, and maximize benefits. Utility Model Content

[0005] This invention provides a photovoltaic controller parallel matching battery management device. By using a CAN communication module, the operating status of the battery pack can be obtained, and then the output current of each photovoltaic controller in the parallel system can be adjusted to achieve the optimal charging output current. This enables stable parallel operation of multiple controller systems and current control to ensure a reasonable distribution of current and thermal stress among modules. It can effectively utilize photovoltaic energy, improve the utilization rate of photovoltaic panels, increase revenue, and combine active and passive protection to ensure the safety of lithium batteries and increase their service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a photovoltaic controller parallel matching battery management device, comprising:

[0007] Battery management system;

[0008] A photovoltaic controller is provided, wherein multiple photovoltaic controllers are provided, and the output terminals of the multiple photovoltaic controllers are electrically connected to the input terminal of the battery management system;

[0009] The CAN communication module is provided in multiple groups, and each group of CAN communication modules is electrically connected between every two photovoltaic controllers.

[0010] Furthermore, it also includes multiple photovoltaic panels, the output of each of which is electrically connected to the input of each photovoltaic controller.

[0011] Furthermore, each pair of photovoltaic controllers is electrically connected to a dry node communication module.

[0012] Furthermore, one end of one of the dry node communication modules (4) is electrically connected to the input end of the battery management system (1).

[0013] Furthermore, one end of one of the CAN communication modules (5) is electrically connected to the input end of the battery management system (1).

[0014] This invention provides a photovoltaic controller for parallel matching with a battery management device. It offers the following advantages:

[0015] (1) The photovoltaic controller is matched with the battery management equipment in parallel. Through the use of the CAN communication module, the working status of the battery pack can be obtained. Then, the output current of each photovoltaic controller in the parallel system is adjusted to achieve the best charging output current, realize the stable parallel operation of multiple controller systems, and control the current to ensure the reasonable distribution of current stress and thermal stress between modules.

[0016] (2) The photovoltaic controller is matched with the battery management equipment in parallel, which can effectively utilize photovoltaic energy, improve the utilization rate of photovoltaic panels, increase revenue, and protect the safety of lithium batteries by combining active and passive protection, thereby increasing the service life of lithium batteries. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention.

[0018] In the diagram: 1. Battery Management System; 2. Photovoltaic Controller; 3. Photovoltaic Panel; 4. Dry Node Communication Module; 5. CAN Communication Module. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] Please see Figure 1 This utility model provides a technical solution: a photovoltaic controller parallel matching battery management device, comprising:

[0021] Battery Management System 1;

[0022] Photovoltaic controller 2, which is provided in multiple ways, and the output terminals of multiple photovoltaic controller 2 are electrically connected to the input terminal of battery management system 1;

[0023] The CAN communication module 5 is provided in multiple groups, and each group of CAN communication modules 5 is electrically connected between each pair of photovoltaic controllers 2.

[0024] In this implementation scheme: The battery management system 1 is equipped with multiple cell modules, a charging input module, an I-BMS module, a dry contact input control port module, and a CAN communication input port module. Multiple photovoltaic controllers 2 output corresponding DC currents, which are connected in parallel via a bus to obtain a total output current I-OUT. The total output current I-OUT is connected to the charging input I-BMS module of the battery management system 1. I-BMS is the charging current required by the battery management system. The CAN communication module 5 obtains the working status of the battery pack and then adjusts the output current of each photovoltaic controller 2 in the parallel system to achieve the optimal charging output current. Multiple photovoltaic controllers 2 output currents I-1, I-2, I-3, ..., IN respectively. When the system has sufficient energy, the photovoltaic controllers 2 output current to charge the battery in a current-equalizing manner. When the system has insufficient energy, the photovoltaic controllers 2 output current to charge the battery in an adaptive non-uniform current-equalizing manner. The parallel system adjusts the current of each individual unit based on the total output current I-OUT to achieve the best effect.

[0025] Specifically, it also includes multiple photovoltaic panels 3, the output of each photovoltaic panel 3 being electrically connected to the input of each photovoltaic controller 2.

[0026] In this embodiment, multiple photovoltaic panels 3 are connected to the corresponding photovoltaic controller 2 via PV input to complete their respective use.

[0027] Specifically, each pair of photovoltaic controllers 2 is electrically connected to a dry node communication module 4.

[0028] In this embodiment, the dry node communication module 4 can realize the stable parallel operation of multiple controller systems and current control. The dry node communication module 4 is combined with the CAN communication module 5 to ensure the safety of the lithium battery system.

[0029] Specifically, one end of one of the dry node communication modules 4 is electrically connected to the input end of the battery management system 1.

[0030] In this embodiment: the dry node communication modules 4 of each photovoltaic controller 2 are connected in parallel, and one of the dry node communication modules 4 is connected to the dry node input control port module in the battery management system 1 to complete the use.

[0031] Specifically, one end of one of the CAN communication modules 5 is electrically connected to the input end of the battery management system 1.

[0032] In this embodiment, the CAN communication modules 5 of each photovoltaic controller 2 are connected in parallel, and one of the CAN communication modules 5 is connected to the CAN communication port input module in the battery management system 1 to complete the use.

[0033] In operation, the photovoltaic controller 2 obtains the real-time demand charging current I-BMS from the battery management system 1 via the CAN communication module 5. Simultaneously, it obtains the number of photovoltaic controllers 2 connected in parallel via the CAN communication module 5. The average current is calculated by dividing the real-time demand current I-BMS of the battery management system 1 by the number of connected photovoltaic controllers, and this average current is used to control the output current of each photovoltaic controller 2. When the calculated current is greater than the maximum output current of a single controller, the output is controlled based on the maximum current of the single controller. When the demand current I-BMS of the battery management system 1 changes, the photovoltaic controller 2 synchronously calculates the required current in real time to adjust the output. Once the demand current I-BMS of the battery management system 1 is less than the maximum total output current I-OUT that the photovoltaic controller 2 can provide, the photovoltaic controller 2 begins to switch to a different parallel control strategy. The photovoltaic controller 2 monitors and obtains the output current of each photovoltaic controller 2 in real time, calculates the summed total current I-OUT, and when I-OUT is less than I-BMS, it begins to adjust... The output current corresponding to each photovoltaic controller 2, i.e., I-1, I-2, I-3, ..., IN, is adjusted. Starting with the photovoltaic controller 2 with parallel address 1, the output current I-1 is increased so that the total current I-OUT equals the current I-BMS required by the battery management system 1. If the requirement is not met, the output current I-2 of the photovoltaic controller 2 with parallel address 2 is increased, and so on. When the photovoltaic panel 3 of a certain photovoltaic controller 2 abnormally reduces its power generation, the system can adjust and increase the output current of other photovoltaic controllers 2 according to the magnitude of the total output current I-OUT to improve the utilization rate of the photovoltaic panel 3 and create greater benefits. When one of the parallel photovoltaic controllers 2 fails, it automatically stops working, and the remaining photovoltaic controllers 2 in the system recalculate the output current of the photovoltaic controller 2. When the CAN communication module 5 is abnormal, the start and stop of the photovoltaic controller 2 can still be controlled through the dry node communication module 4 to ensure the safe operation of the system.

[0034] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic controller parallel matching battery management device, characterized in that, include: Battery Management System (1); A photovoltaic controller (2) is provided, and the output terminals of the multiple photovoltaic controllers (2) are electrically connected to the input terminal of the battery management system (1); The CAN communication module (5) is provided in multiple groups, and each group of the CAN communication module (5) is electrically connected between each two photovoltaic controllers (2).

2. The photovoltaic controller parallel matching battery management device according to claim 1, characterized in that, It also includes multiple photovoltaic panels (3), the output of each photovoltaic panel (3) being electrically connected to the input of each photovoltaic controller (2).

3. The photovoltaic controller parallel matching battery management device according to claim 2, characterized in that, Each pair of photovoltaic controllers (2) is electrically connected to a dry node communication module (4).

4. A photovoltaic controller parallel matching battery management device according to claim 3, characterized in that, One end of one of the dry node communication modules (4) is electrically connected to the input end of the battery management system (1).

5. A photovoltaic controller parallel matching battery management device according to claim 4, characterized in that, One end of one of the CAN communication modules (5) is electrically connected to the input end of the battery management system (1).

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