Energy storage heat management multi-fan control system

Abstract

The utility model discloses an energy storage heat management multi-fan control system which comprises a plurality of alternating current to direct current power module water temperature acquisition units, a plurality of direct current to direct current power module water temperature acquisition units, a battery management system unit, an energy storage charging pile host controller, a heat management unit controller and a fan duty ratio control unit. The energy storage charging pile host controller determines the working mode of the heat management unit controller according to the temperatures collected by the AC-DC power module water temperature collection unit and the DC-DC power module water temperature collection unit and the maximum and minimum battery cell temperatures fed back by the battery management system unit. And the heat management unit controller controls the fan duty ratio control unit to work according to the determined working mode. The control logic of starting of the fan is changed, and the fan operates in a variable duty ratio control mode, so that the use requirement of 55dB noise limitation of a community is met while the refrigerating capacity required by development is ensured.

Description

Energy Storage Thermal Management Multi-Fan Control System Technical Field

[0001] This utility model relates to a thermal management system for energy storage charging piles, and more specifically, to a multi-fan control system for energy storage thermal management. Background Technology

[0002] In traditional energy storage projects, when energy storage charging piles provide high-power charging to vehicles, the power modules and batteries experience significant temperature rises, necessitating liquid cooling for both. Currently, liquid cooling solutions primarily involve multiple battery packs, with relatively limited application scenarios (outdoors), focusing on off-peak energy replenishment and peak-peak grid feedback. Liquid cooling relies solely on large water chillers to cool the battery packs. Due to the application scenario, only cooling power is considered, with no additional noise limitations. Traditional outdoor energy storage systems mostly employ fixed-frequency cooling, with fans controlled by a fixed duty cycle.

[0003] Because charging stations need to be installed in residential areas and also operate in commercial districts, strict requirements are placed on the noise level of the entire unit; otherwise, noise pollution will occur. Summary of the Invention

[0004] This invention provides a multi-fan control system for energy storage thermal management, which at least achieves the goal of reducing noise pollution.

[0005] To solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0006] A multi-fan control system for energy storage thermal management includes multiple AC-to-DC power module water temperature acquisition units, multiple DC-to-DC power module water temperature acquisition units, a battery management system unit, an energy storage charging pile host controller, a thermal management unit controller, and a fan duty cycle control unit.

[0007] The AC-to-DC power module water temperature acquisition unit is used to acquire the water temperature signal of the AC-to-DC power module;

[0008] The DC-to-DC power module water temperature acquisition unit is used to acquire the water temperature signal of the DC-to-DC power module;

[0009] The battery management system unit is used to feed back the maximum and minimum temperatures of the battery cells to the main controller of the energy storage charging pile.

[0010] The main controller of the energy storage charging pile determines the working mode of the thermal management unit controller based on the water temperature signal and the maximum and minimum temperatures of the battery cells.

[0011] The thermal management unit controller controls the fan duty cycle control unit to operate according to the determined working mode.

[0012] The AC-to-DC power module water temperature acquisition unit, the DC-to-DC power module water temperature acquisition unit, the battery management system unit, and the thermal management unit controller are all connected to the energy storage charging pile host controller via a CAN bus device.

[0013] Furthermore, it includes a battery pack temperature acquisition unit for acquiring cell temperature and is connected to the battery management system unit.

[0014] Furthermore, it includes an ambient temperature detection signal module for collecting ambient temperature data and connecting it to the thermal management unit controller.

[0015] Furthermore, it includes a refrigerant-side high and low pressure detection signal module, used to collect the compressor outlet pressure and connect to the thermal management unit controller.

[0016] Furthermore, it includes a water-cooled side temperature detection signal module for acquiring the compressor outlet temperature and connecting it to the thermal management unit controller.

[0017] According to the technical solution of this utility model, the main controller of the energy storage charging pile determines the working mode of the thermal management unit controller by the temperature collected by the AC to DC power module water temperature acquisition unit and the DC to DC power module water temperature acquisition unit, as well as the maximum and minimum cell temperatures fed back by the battery management system unit. The thermal management unit controller then controls the fan duty cycle control unit to work according to the determined working mode.

[0018] This invention changes the control logic for fan activation, and the fan operates under a variable duty cycle control mode, thereby ensuring the required cooling capacity while meeting the 55dB noise limit requirement of the residential area. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention.

[0020] Figure 1 is a structural block diagram of the multi-fan control system for energy storage thermal management provided by this utility model;

[0021] Figure 2 is a control logic flowchart of the multi-fan control system for energy storage thermal management provided by this utility model.

[0022] In the diagram, 1 - AC to DC power module I water temperature acquisition unit, 2 - AC to DC power module II water temperature acquisition unit, 3 - AC to DC power module III water temperature acquisition unit, 4 - DC to DC power module I water temperature acquisition unit, 5 - DC to DC power module II water temperature acquisition unit, 6 - DC to DC power module III water temperature acquisition unit.

[0023] CAN bus device, 8-battery pack temperature acquisition unit, 9-battery management system unit, 10-energy storage charging pile main controller, 11-thermal management unit controller.

[0024] 12-Fan I duty cycle control unit, 13-Fan II duty cycle control unit, 14-Fan III duty cycle control unit, 15-Ambient temperature detection signal module, 16-Refrigerant side high and low pressure detection signal module, 17-Water cooling side temperature detection signal module. Detailed Implementation

[0025] To enable those skilled in the art to better understand this utility model, the present utility model will be further described clearly and completely below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0026] A typical embodiment of this utility model provides a multi-fan control system for energy storage thermal management, as shown in Figure 1. It includes multiple AC-to-DC power module water temperature acquisition units, multiple DC-to-DC power module water temperature acquisition units, a battery management system unit 9, an energy storage charging pile host controller 10, a thermal management unit controller 11, and a fan duty cycle control unit.

[0027] The AC-to-DC power module water temperature acquisition unit, the DC-to-DC power module water temperature acquisition unit, the battery management system unit 9, and the thermal management unit controller 11 are respectively connected to the energy storage charging pile host controller 10 through the CAN bus device 7 and realize communication interaction.

[0028] The AC-to-DC power module water temperature acquisition unit is used to acquire the water temperature signal of the AC-to-DC power module. Exemplarily, it includes AC-to-DC power module I water temperature acquisition unit 1, AC-to-DC power module II water temperature acquisition unit 2, and AC-to-DC power module III water temperature acquisition unit 3, which are respectively connected to the energy storage charging pile host controller 10 via a CAN bus device 7 and achieve communication interaction.

[0029] The DC-to-DC power module water temperature acquisition unit is used to acquire the water temperature signal of the DC-to-DC power module. Exemplarily, it includes a DC-to-DC power module I water temperature acquisition unit 4, a DC-to-DC power module II water temperature acquisition unit 5, and a DC-to-DC power module III water temperature acquisition unit 6, which are respectively connected to the energy storage charging pile host controller 10 via a CAN bus device 7 and achieve communication interaction.

[0030] The battery management system unit 9 is used to feed back the maximum and minimum temperatures of the battery cells to the energy storage charging pile host controller 10. The battery pack temperature acquisition unit 8 is connected to the battery management system unit 9 and is used to acquire the temperature of the battery cells, transmitting the temperature of the battery cells to the battery management system unit 9 through signal transmission.

[0031] The main controller 10 of the energy storage charging pile determines the working mode of the thermal management unit controller 11 based on the water temperature signal and the maximum and minimum temperatures of the battery cells, including cooling mode, self-circulation mode, heating mode, etc.

[0032] The thermal management unit controller 11 controls the fan duty cycle control unit to operate according to the determined working mode.

[0033] The thermal management unit is the core component of the overall thermal management system for energy storage charging piles. The entire unit controls the liquid temperature, providing heating and cooling functions to manage heat exchange in the energy storage charging pile system. The entire unit should be able to autonomously control the entire thermal management process. Major components include a compressor, PTC, water pump, thermal management fan, expansion tank, condenser, electronic expansion valve, piping, high and low voltage wiring harnesses, thermal management unit controller (HCU), and various sensors.

[0034] The fan duty cycle control unit includes fan I duty cycle control unit 12, fan II duty cycle control unit 13, and fan III duty cycle control unit 14.

[0035] In a relatively specific embodiment, the energy storage thermal management multi-fan control system provided by this utility model further includes an ambient temperature detection signal module 15, a refrigerant-side high and low pressure detection signal module 16, and a water-cooled-side temperature detection signal module 17.

[0036] The ambient temperature detection signal module 15, the refrigerant side high and low pressure detection signal module 16, and the water-cooled side temperature detection signal module 17 are all connected to the thermal management unit controller.

[0037] The ambient temperature detection signal module 15 is used to collect ambient temperature. The refrigerant-side high and low pressure detection signal module 16 is used to collect compressor outlet pressure. The water-cooled side temperature detection signal module 17 is used to collect compressor outlet temperature.

[0038] The overall concept of this utility model is that the main controller 10 of the energy storage charging pile determines the working mode of the thermal management unit controller 11 by using the temperature collected by the AC to DC power module water temperature acquisition unit and the DC to DC power module water temperature acquisition unit, as well as the maximum and minimum cell temperatures fed back by the battery management system unit 9.

[0039] During implementation, the system requires extensive information exchange between the EMS (Electronic Management System), BMS (Battery Management System), and HCU (Thermal Management Unit), including operating mode, ambient temperature, maximum and minimum battery pack temperatures, maximum water temperature of the power module, and compressor exhaust temperature and pressure. This multi-level information exchange is essential for efficient and precise system operation. All control logic decisions can be implemented within the BMS controller, eliminating the need for the AFC (Automatic Function Control) controller to collect all the information and execute these decisions.

[0040] As shown in Figure 2, when the maximum cell temperature fed back by the battery management system unit 9 is greater than 30°C or the maximum water temperature fed back by the AC to DC power module water temperature acquisition unit and the DC to DC power module water temperature acquisition unit is greater than or equal to 35°C, the energy storage charging pile host controller 10 will send a thermal management operation "cooling mode" command to the thermal management unit controller 11. The thermal management unit controller 11 will execute the "cooling mode" operation, start the compressor, run the fan, and adjust the opening and closing of the electronic expansion valve.

[0041] Specific control logic for fans and noise:

[0042] When the thermal management unit controller 11 is selected as "cooling mode", it intelligently sends control signals to the fan I duty cycle control unit 12, fan II duty cycle control unit 13, and fan III duty cycle control unit 14 based on the "compressor outlet pressure" detected by the refrigerant side high and low pressure detection signal module 16 and the "ambient temperature" detected by the ambient temperature detection signal module 15. In modes other than those mentioned above, the condenser fan is turned off (PWM=0%).

[0043] The electric fan's status adjustment range has three levels: Level 1 is 15%~35% PWM; Level 2 is fixed at 50% PWM; and Level 3 is fixed at 60% PWM. When the electric fan requests to start, the number of fans to be turned on is determined based on the "ambient temperature," and the initial fan speed is determined based on the "compressor discharge pressure."

[0044] a. When the ambient temperature is ≤ 10℃, only one electric fan will be activated initially;

[0045] b. When 10℃ < ambient temperature ≤ 20℃, the two electronic fans are started initially;

[0046] c. When 20℃ < ambient temperature, the three electric fans are activated initially.

[0047] Fan normal operation adjustment:

[0048] During normal operation, the electric fan speed is 15% to 35% of the PWM value corresponding to the "compressor discharge pressure" of 1.0 MPa (A) to 2.0 MPa (A).

[0049] Medium to high speed is only applied when three electric fans are already running:

[0050] a. When the compressor outlet pressure is ≥ 2.15 MPa (A), the condenser fan operates at medium speed (PWM=50%).

[0051] b. When the compressor outlet pressure is ≥ 2.35 MPa (A), the condenser fan operates at high speed (PWM=60%).

[0052] Fan control to operate at a lower speed:

[0053] a. If all three electronic fans maintain PWM=15% for 30 minutes continuously, or if the compressor outlet pressure is ≤ 0.8Mpa(A), turn off one electronic fan, and at the same time adjust the other two electronic fans to PWM=35% for 60 seconds, and then adjust them according to normal operation.

[0054] b. If both electronic fans maintain PWM=15% for 30 minutes continuously, or if the compressor outlet pressure is ≤ 0.8Mpa(A), turn on the other electronic fan and adjust it to PWM=35% for 60 seconds, while turning off the two running electronic fans. Then adjust according to normal operation.

[0055] Fan control for upshifting operation:

[0056] a. If one electronic fan maintains PWM=35% for 30 minutes continuously, or if the compressor outlet pressure is ≥ 2.15Mpa(A), turn on the other two electronic fans and adjust them to PWM=15% for 30 seconds, while turning off one of the running electronic fans. Then adjust according to normal operation.

[0057] b. If both electronic fans maintain PWM=35% for 30 minutes continuously, or if the compressor outlet pressure is ≥ 2.15Mpa(A), turn on another electronic fan and adjust all three electronic fans to PWM=15% for 30 seconds, and then adjust according to normal operation.

[0058] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. For those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-fan control system for energy storage thermal management, characterized in that, The system includes multiple AC-to-DC power module water temperature acquisition units, multiple DC-to-DC power module water temperature acquisition units, a battery management system unit, an energy storage charging pile main controller, a thermal management unit controller, and a fan duty cycle control unit. The AC-to-DC power module water temperature acquisition units are used to acquire the water temperature signals of the AC-to-DC power modules. The DC-to-DC power module water temperature acquisition units are used to acquire the water temperature signals of the DC-to-DC power modules. The battery management system unit is used to feed back the maximum and minimum cell temperatures to the energy storage charging pile main controller. The energy storage charging pile main controller determines the operating mode of the thermal management unit controller based on the water temperature signals and the maximum and minimum cell temperatures. The thermal management unit controller controls the fan duty cycle control unit to operate according to the determined operating mode. The AC-to-DC power module water temperature acquisition units, DC-to-DC power module water temperature acquisition units, battery management system unit, and thermal management unit controller are all connected to the energy storage charging pile main controller via a CAN bus device.

2. The multi-fan control system for energy storage thermal management according to claim 1, characterized in that, It includes a battery pack temperature acquisition unit, which is used to acquire cell temperature and is connected to the battery management system unit.

3. The multi-fan control system for energy storage thermal management according to claim 1 or 2, characterized in that, It includes an ambient temperature detection signal module, which is used to collect ambient temperature and connect to the thermal management unit controller.

4. The multi-fan control system for energy storage thermal management according to claim 3, characterized in that, It includes a refrigerant-side high and low pressure detection signal module, which is used to collect the compressor outlet pressure and connect to the thermal management unit controller.

5. The multi-fan control system for energy storage thermal management according to claim 4, characterized in that, It includes a water-cooled side temperature detection signal module, which is used to collect the compressor outlet temperature and connect to the thermal management unit controller.

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