Constant temperature control device for electrolyte of all-vanadium redox flow battery

Abstract

The utility model belongs to the technical field of electrolyte temperature control devices, and particularly relates to a constant temperature control device for an all-vanadium redox flow battery electrolyte, which comprises a positive electrolyte tank and a negative electrolyte tank which are arranged on an all-vanadium redox flow battery, comprising a plurality of liquid exchange devices, a plurality of temperature detection devices, a plurality of heating devices, a positive electrolyte temperature regulation storage container and a negative electrolyte temperature regulation storage container, a main control module is arranged, and the heating device and the temperature detection device are respectively connected with the main control module. The heating device has the advantages that the heating device is more uniform in heating and easier to maintain.

Description

Technical Field

[0001] This utility model belongs to the technical field of electrolyte temperature control devices, and in particular relates to a constant temperature control device for electrolyte in a vanadium redox flow battery. Background Technology

[0002] Vanadium redox flow batteries are an advanced energy storage technology with long life, high safety and large-scale energy storage capabilities. They are widely used in scenarios such as renewable energy grid connection, grid frequency regulation and peak shaving, and independent microgrid systems.

[0003] Its core components include the battery stack, electrolyte, storage tank, circulation system, and control system. The electrolyte, as a critical medium, directly affects the battery's charge / discharge efficiency, electrolyte stability, and overall system performance. Typically, the electrolyte temperature is controlled by a heating device. However, single-point heating suffers from uneven temperature distribution, and multi-point heating may accelerate electrolyte decomposition and side reactions. Coordination between multiple heating points is difficult, and a malfunction at any heating point necessitates adjustments to the control method; otherwise, temperature defects may worsen, increasing maintenance complexity.

[0004] Therefore, it is necessary to optimize the electrolyte heating device to achieve a more uniform heating and easier maintenance. Utility Model Content

[0005] In view of the technical problems existing in the background art, this utility model provides a constant temperature control device for the electrolyte of vanadium redox flow batteries, which can achieve more uniform heating and is easier to maintain.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A constant temperature control device for the electrolyte of a vanadium redox flow battery is provided, which is installed in the positive electrolyte tank and the negative electrolyte tank of the vanadium redox flow battery. It includes multiple liquid exchange devices, multiple temperature detection devices, multiple heating devices, a temperature-controlled storage container for the positive electrolyte, and a temperature-controlled storage container for the negative electrolyte. A main control module is provided. The heating devices and the temperature detection devices are respectively connected to the main control module.

[0008] The bottom of the positive electrolyte temperature-controlled storage container and the bottom of the negative electrolyte temperature-controlled storage container are respectively provided with a first heating device and a second heating device, and the bottom of the positive electrolyte tank and the bottom of the negative electrolyte tank are respectively provided with a third heating device and a fourth heating device.

[0009] The positive electrolyte temperature-controlled storage container and the negative electrolyte temperature-controlled storage container are respectively equipped with a first temperature detection device and a second temperature detection device.

[0010] A first liquid exchange device is provided between the positive electrolyte temperature-controlled storage container and the positive electrolyte tank, and a second liquid exchange device is provided between the negative electrolyte temperature-controlled storage container and the negative electrolyte tank.

[0011] Preferably, the first liquid exchange device includes a plurality of liquid delivery pipes, each of which is equipped with a liquid delivery pump, and the liquid delivery pump is connected to the main control module;

[0012] The input end of the first liquid delivery pipe is located in the positive electrolyte temperature-controlled storage container and the output end is located in the positive electrolyte tank. The output end of the second liquid delivery pipe is located in the positive electrolyte temperature-controlled storage container and the input end is located in the positive electrolyte tank.

[0013] Preferably, the input end of the first liquid delivery pipe is located at the bottom of the positive electrolyte temperature-controlled storage container and the output end is located at the top of the positive electrolyte tank, and the output end of the second liquid delivery pipe is located at the top of the positive electrolyte temperature-controlled storage container and the input end is located at the middle of the positive electrolyte tank.

[0014] Preferably, the second liquid exchange device includes a plurality of liquid delivery pipes, each of which is equipped with a liquid delivery pump, and the liquid delivery pump is connected to the main control module;

[0015] The input end of the third liquid delivery pipe is located in the negative electrolyte temperature-controlled storage container and the output end is located in the negative electrolyte tank. The output end of the fourth liquid delivery pipe is located in the negative electrolyte temperature-controlled storage container and the input end is located in the negative electrolyte tank.

[0016] Preferably, the input end of the third liquid delivery pipe is located at the bottom of the negative electrolyte temperature-regulating storage container and the output end is located at the top of the negative electrolyte tank, and the output end of the fourth liquid delivery pipe is located at the top of the negative electrolyte temperature-regulating storage container and the input end is located at the middle of the negative electrolyte tank.

[0017] Preferably, the heating device is an electric heating element.

[0018] Preferably, the temperature detection device uses a PT100 temperature sensor.

[0019] Preferably, the main control module adopts a PLC controller or an STM32 series microcontroller.

[0020] Preferably, a liquid level detector is provided in both the positive electrolyte tank and the negative electrolyte tank, and the liquid level detector is connected to the main control module.

[0021] This utility model has the following advantages and beneficial effects:

[0022] This invention improves charging and discharging efficiency by setting up a temperature detection device to monitor the temperature change of the electrolyte in real time, ensuring that the temperature is always maintained within the optimal working range.

[0023] This invention establishes a circulation system by using a positive electrolyte temperature-controlled storage container and a negative electrolyte temperature-controlled storage container. This allows the electrolyte to flow between the temperature-controlled storage container and the electrolyte tank, ensuring thorough mixing of electrolytes in different parts, reducing local temperature differences, improving temperature uniformity, and preventing battery performance imbalances caused by excessive temperature gradients.

[0024] The additional heating circulation system of this invention is an additional part, located outside the battery electrolyte, which facilitates maintenance and repair, and will not affect the heating operation of the vanadium redox flow battery itself in the event of a malfunction.

[0025] This invention has a simple and easy-to-implement structure, is applicable to all-vanadium redox flow battery energy storage systems of different scales, has a high cost-performance ratio, and is easy to promote and implement. Attached Figure Description

[0026] Figure 1 A schematic diagram of the temperature control device for the electrolyte of the all-vanadium redox flow battery provided by this utility model;

[0027] Figure 2 The electrical schematic diagram provided for this utility model;

[0028] Icons: 101-Positive electrolyte temperature-controlled storage container, 102-First heating device, 103-Third heating device, 104-Positive electrolyte tank, 105-First temperature detection device, 106-First liquid delivery pipe, 107-Second liquid delivery pipe, 201-Negative electrolyte temperature-controlled storage container, 202-Second heating device, 203-Fourth heating device, 204-Negative electrolyte tank, 205-Second temperature detection device, 206-Third liquid delivery pipe, 207-Fourth liquid delivery pipe, 108-Liquid delivery pump, 109-Liquid level detector. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] This embodiment provides a temperature control device for the electrolyte of a vanadium redox flow battery. (See attached document.) Figure 1 The positive electrolyte tank 104 and negative electrolyte tank 204 of the vanadium redox flow battery include multiple liquid exchange devices, multiple temperature detection devices, multiple heating devices, positive electrolyte temperature-controlled storage container 101 and negative electrolyte temperature-controlled storage container 201; a main control module is provided, and the heating devices and the temperature detection devices are respectively connected to the main control module;

[0033] The bottom of the positive electrolyte temperature-controlled storage container 101 and the bottom of the negative electrolyte temperature-controlled storage container 201 are respectively provided with a first heating device 102 and a second heating device 202, and the bottom of the positive electrolyte tank 104 and the bottom of the negative electrolyte tank 204 are respectively provided with a third heating device 103 and a fourth heating device 203.

[0034] The positive electrolyte temperature-controlled storage container 101 and the negative electrolyte temperature-controlled storage container 201 are respectively provided with a first temperature detection device 105 and a second temperature detection device 205.

[0035] A first liquid exchange device is provided between the positive electrolyte temperature-controlled storage container 101 and the positive electrolyte tank 104, and a second liquid exchange device is provided between the negative electrolyte temperature-controlled storage container 201 and the negative electrolyte tank 204.

[0036] In this embodiment, the first liquid exchange device includes a plurality of liquid delivery pipes, and each of the liquid delivery pipes is respectively provided with a liquid delivery pump 108, and the liquid delivery pump 108 is connected to the main control module;

[0037] The input end of the first liquid delivery pipe 106 is located in the positive electrolyte temperature-controlled storage container 101 and the output end is located in the positive electrolyte tank 104. The output end of the second liquid delivery pipe 107 is located in the positive electrolyte temperature-controlled storage container 101 and the input end is located in the positive electrolyte tank 104.

[0038] Furthermore, the input end of the first liquid delivery pipe 106 is located at the bottom of the positive electrolyte temperature-controlled storage container 101 and the output end is located at the top of the positive electrolyte tank 104, while the output end of the second liquid delivery pipe 107 is located at the top of the positive electrolyte temperature-controlled storage container 101 and the input end is located at the middle of the positive electrolyte tank 104.

[0039] On the other hand, the second liquid exchange device includes a plurality of liquid delivery pipes, each of which is equipped with a liquid delivery pump 108, and the liquid delivery pump 108 is connected to the main control module;

[0040] The input end of the third liquid delivery pipe 206 is located in the negative electrolyte temperature-regulating storage container 201 and the output end is located in the negative electrolyte tank 204. The output end of the fourth liquid delivery pipe 207 is located in the negative electrolyte temperature-regulating storage container 201 and the input end is located in the negative electrolyte tank 204.

[0041] Based on this, the input end of the third liquid delivery pipe 206 is located at the bottom of the negative electrolyte temperature-regulating storage container 201 and the output end is located at the top of the negative electrolyte tank 204, and the output end of the fourth liquid delivery pipe 207 is located at the top of the negative electrolyte temperature-regulating storage container 201 and the input end is located at the middle of the negative electrolyte tank 204.

[0042] As a preferred embodiment, the heating device uses an electric heating element.

[0043] In addition, the temperature detection device preferably uses a PT100 temperature sensor.

[0044] Furthermore, the main control module preferably adopts a PLC controller or an STM32 series microcontroller.

[0045] The working principle of this embodiment is as follows:

[0046] The temperature is monitored in real time by a temperature detection device and fed back to the main control module. The main control module then selects to turn the heating function of the entire device on or off based on the real-time temperature. Generally, the temperature detection device can be installed on the pipeline leading from the positive electrolyte tank 104 and the negative electrolyte tank 204 to the fuel cell stack. The positive and negative electrolytes react at the charging station to form an electric current.

[0047] When the heating function is activated, the third heating device 103 at the bottom of the positive electrolyte temperature-controlled storage container 101 starts heating. To avoid uneven heating and slow temperature diffusion within the liquid, the first heating device 102 at the bottom of the positive electrolyte temperature-controlled storage container 101 also starts heating. The main control module can control the liquid delivery pump 108 of the first liquid delivery pipe 106 to start. Consequently, the liquid that heats up faster at the bottom of the positive electrolyte temperature-controlled storage container 101 is delivered to the top of the positive electrolyte tank 104, where the heating is slowest, thereby improving heating uniformity and heating speed. Similarly, the fourth heating device 203 at the bottom of the negative electrolyte temperature-controlled storage container 201 starts heating, and to avoid uneven heating and slow temperature diffusion within the liquid... At the same time, the second heating device 202 at the bottom of the negative electrolyte temperature-regulating storage container 201 also starts heating. At this time, the main control module can control the liquid delivery pump 108 of the third liquid delivery pipe 206 to start. Then, the liquid at the bottom of the negative electrolyte temperature-regulating storage container 201 that heats up faster will be delivered to the top of the negative electrolyte tank 204 where the heating is slowest, thereby improving the uniformity of heating and the heating speed.

[0048] The positive electrolyte tank 104 and negative electrolyte tank 204 installed in the vanadium redox flow battery include multiple liquid exchange devices, multiple temperature detection devices, multiple heating devices, positive electrolyte temperature-controlled storage container 101 and negative electrolyte temperature-controlled storage container 201; a main control module is provided, and the heating devices are respectively connected to the main control module.

[0049] While the high-temperature electrolyte in the positive electrolyte temperature-controlled storage container 101 and the negative electrolyte temperature-controlled storage container 201 is being transported to the positive electrolyte tank 104 and the negative electrolyte tank 204, liquid can also be pumped from the middle of the positive electrolyte tank 104 and the negative electrolyte tank 204 to the positive electrolyte temperature-controlled storage container 101 and the negative electrolyte temperature-controlled storage container 201 through the second liquid delivery pipe 107 and the fourth liquid delivery pipe 207, respectively, to achieve liquid exchange and prevent electrolyte overflow. The liquid is drawn from the middle of the positive electrolyte tank 104 and the negative electrolyte tank 204 to avoid the parts with higher temperatures during heating.

[0050] As another preferred embodiment, level detectors 109 are respectively installed in the positive electrolyte tank 104 and the negative electrolyte tank 204, and the level detectors 109 are connected to the main control module. By monitoring the liquid levels in the positive electrolyte tank 104 and the negative electrolyte tank 204, the opening of the second liquid delivery pipe 107 and the fourth liquid delivery pipe 207 can be controlled, and electrolyte will only be output to the positive electrolyte temperature-controlled storage container 101 and the negative electrolyte temperature-controlled storage container 201 when the liquid level is too high.

[0051] In addition to faster and more uniform heating, this embodiment removes the positive electrolyte temperature-regulating storage container 101 and the negative electrolyte temperature-regulating storage container 201, which is a conventional heating method. Even if the additional heating components malfunction, it will not affect normal heating, making maintenance convenient.

[0052] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A temperature control device for the electrolyte of a vanadium redox flow battery, disposed in the positive electrolyte tank (104) and the negative electrolyte tank (204) of the vanadium redox flow battery, characterized in that... It includes multiple liquid exchange devices, multiple temperature detection devices, multiple heating devices, a positive electrolyte temperature-controlled storage container (101) and a negative electrolyte temperature-controlled storage container (201); it is equipped with a main control module, and the heating devices and the temperature detection devices are respectively connected to the main control module; The bottom of the positive electrolyte temperature-controlled storage container (101) and the bottom of the negative electrolyte temperature-controlled storage container (201) are respectively provided with a first heating device (102) and a second heating device (202), and the bottom of the positive electrolyte tank (104) and the bottom of the negative electrolyte tank (204) are respectively provided with a third heating device (103) and a fourth heating device (203); The positive electrolyte temperature-controlled storage container (101) and the negative electrolyte temperature-controlled storage container (201) are respectively provided with a first temperature detection device (105) and a second temperature detection device (205); A first liquid exchange device is provided between the positive electrolyte temperature-controlled storage container (101) and the positive electrolyte tank (104), and a second liquid exchange device is provided between the negative electrolyte temperature-controlled storage container (201) and the negative electrolyte tank (204).

2. The constant temperature control device for electrolyte of a vanadium redox flow battery according to claim 1, characterized in that: The first liquid exchange device includes multiple liquid delivery pipes, each of which is equipped with a liquid delivery pump (108), and the liquid delivery pump (108) is connected to the main control module; The input end of the first liquid delivery pipe (106) is located in the positive electrolyte temperature-controlled storage container (101) and the output end is located in the positive electrolyte tank (104). The output end of the second liquid delivery pipe (107) is located in the positive electrolyte temperature-controlled storage container (101) and the input end is located in the positive electrolyte tank (104).

3. The constant temperature control device for electrolyte of a vanadium flow battery according to claim 2, characterized in that: The input end of the first liquid delivery pipe (106) is located at the bottom of the positive electrolyte temperature-controlled storage container (101) and the output end is located at the top of the positive electrolyte tank (104). The output end of the second liquid delivery pipe (107) is located at the top of the positive electrolyte temperature-controlled storage container (101) and the input end is located at the middle of the positive electrolyte tank (104).

4. The constant temperature control device for electrolyte of a vanadium flow battery according to claim 1, characterized in that: The second liquid exchange device includes multiple liquid delivery pipes, each of which is equipped with a liquid delivery pump (108), and the liquid delivery pump (108) is connected to the main control module; The input end of the third liquid delivery pipe (206) is located in the negative electrolyte temperature-controlled storage container (201) and the output end is located in the negative electrolyte tank (204). The output end of the fourth liquid delivery pipe (207) is located in the negative electrolyte temperature-controlled storage container (201) and the input end is located in the negative electrolyte tank (204).

5. The constant temperature control device for electrolyte of a vanadium flow battery according to claim 4, characterized in that: The input end of the third liquid delivery pipe (206) is located at the bottom of the negative electrolyte temperature-controlled storage container (201), and the output end is located at the top of the negative electrolyte tank (204). The output end of the fourth liquid delivery pipe (207) is located at the top of the negative electrolyte temperature-controlled storage container (201), and the input end is located at the middle of the negative electrolyte tank (204).

6. The constant temperature control device for electrolyte of a vanadium flow battery according to claim 1, characterized in that: The heating device adopts an electric heating pipe.

7. The constant temperature control device for electrolyte of a vanadium flow battery according to claim 1, characterized in that: The temperature detecting device adopts a temperature sensor with a model of PT100. 8.The constant temperature control device for electrolyte of a vanadium redox flow battery according to claim 1, characterized in that: The main control module adopts a PLC controller or an STM32 series single-chip microcomputer. 9.The constant temperature control device for electrolyte of a vanadium redox flow battery according to claim 1, characterized in that: Liquid level detectors (109) are arranged in the positive electrolyte tank (104) and the negative electrolyte tank (204) respectively, and the liquid level detectors (109) are connected to the main control module.

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