Multifunctional integrated liquid cooling optical storage system

Abstract

The invention relates to the technical field of optical storage systems, in particular to a multifunctional integrated liquid cooling optical storage system, which comprises an optical storage connection module for converting and transmitting electric power converted by a photovoltaic module; the battery energy storage module is used for carrying out electric energy storage on the electric power converted by the photovoltaic module, and the battery energy storage module is electrically connected with a load; the liquid cooling module is used for carrying out water-cooling heat exchange on the battery energy storage module and maintaining the operation temperature of the battery energy storage module; the control module is used for controlling the operation of the optical storage connection module, the battery energy storage module and the liquid cooling module; and based on the energy storage temperature of the battery energy storage module, the control module is used for correspondingly matching the charging and discharging power of the battery energy storage module and the operation power of the liquid cooling module. The invention has the advantages of stably improving the charging and discharging efficiency of the battery energy storage module and converting the multifunctional application of the power of the photovoltaic module.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic storage systems, and more specifically, to a multifunctional integrated liquid-cooled photovoltaic storage system. Background Art

[0002] As a key link in power grid peak and valley regulation or energy storage, energy storage systems are now widely used.

[0003] Energy storage technology is also widely used to improve the matching degree between grid output and load, reduce grid output fluctuations, reduce power loss, and improve energy utilization efficiency.

[0004] As a part of the energy storage system, the photovoltaic energy storage system is very likely to cause the temperature of the entire photovoltaic energy storage system to be extremely unstable due to the repeated charging and discharging of various converters and power reserves during the entire operation process, which may lead to load carrying. Summary of the invention

[0005] In view of the above-mentioned deficiencies of the prior art, the purpose of the present application is to provide a multifunctional integrated liquid-cooled photovoltaic storage system, which has the advantages of stably improving the charging and discharging efficiency of the battery energy storage module and converting the power of the photovoltaic module.

[0006] The above technical objectives of the present application are achieved through the following technical solutions: A multifunctional integrated liquid-cooled optical storage system, comprising:

[0007] The photovoltaic storage connection module converts and transmits the electricity converted by the photovoltaic modules;

[0008] A battery energy storage module electrically connected to the photovoltaic storage connection module, the battery energy storage module stores the electricity converted by the photovoltaic module, and the battery energy storage module is electrically connected to a load;

[0009] Liquid cooling module, which performs water cooling and heat exchange on the battery energy storage module to maintain the operating temperature of the battery energy storage module;

[0010] A control module, electrically connected to the photovoltaic energy storage connection module, the battery energy storage module and the liquid cooling module, respectively, to control the operation of the photovoltaic energy storage connection module, the battery energy storage module and the liquid cooling module;

[0011] Based on the temperature of energy storage of the battery energy storage module, the control module is used to respectively match the charging and discharging power of the battery energy storage module and the operating power of the liquid cooling module.

[0012] Preferably, a plurality of temperature monitoring areas are established and distributed on the battery energy storage module, a plurality of temperature monitoring points are set in each of the temperature monitoring areas, and temperature detection values ​​of different positions on the temperature monitoring points are obtained by temperature sensors. Based on the temperature detection values, the temperature distribution of the battery energy storage module is determined.

[0013] Preferably, based on the acquired temperature detection values, the average temperature t0 of each temperature monitoring area is calculated, and the control module is provided with a plurality of preset temperatures t1-tn. The power operation size of the liquid cooling module is controlled by the control module, and adaptive operating power matching is performed in conjunction with the comparison between each temperature monitoring area and the preset temperature.

[0014] Preferably, according to the control of the control module, a preset time interval is set to obtain the temperature detection value of each temperature monitoring point on each temperature monitoring area, the average temperature of each temperature monitoring area is temporarily stored, and the increase rate y of the average temperature of the same temperature monitoring area is calculated based on the preset time interval before and after. According to the size of the increase rate y, the liquid cooling module is controlled by the control module to match the corresponding operating power.

[0015] Preferably, a comparison difference z is performed based on the temperature detection values ​​of multiple temperature monitoring points in the same temperature monitoring area, and a preset difference value z1 is used; when z≥z1, the control module controls to increase the operating power of the liquid cooling module.

[0016] Preferably, the comparison difference z is based on the highest temperature detection value t among the temperature detection values ​​of multiple temperature monitoring points. 高 and the minimum temperature detection value t 低 The comparison difference between .

[0017] Preferably, based on the same temperature monitoring area, the current highest temperature detection value t 高 and the current minimum temperature detection value t 低 The average value of 平 Compared with the average temperature T0, the detection abnormality of the temperature monitoring point is judged by comparing the value. The average temperature T0 is calculated by subtracting the current maximum temperature detection value t 高 and the current minimum temperature detection value t 低 The average temperature after removal.

[0018] Preferably, the control module is connected to a central console, and detection abnormalities are displayed on the central console through the control module, thereby reminding the inspection personnel to perform fixed-point maintenance.

[0019] In summary, the present application has the following beneficial effects:

[0020] 1. The photovoltaic module is used to convert and transmit the electricity converted by the photovoltaic module, and the battery energy storage module is used to store the electricity converted by the photovoltaic module. At the same time, the battery energy storage module is electrically connected to the load to provide electricity for the load, so as to achieve the purpose of popularizing the application of electricity converted by photovoltaic modules;

[0021] 2. The battery energy storage module receives the electricity converted by the photovoltaic component through the photovoltaic storage connection module, and then applies it through the load, so as to continue to operate. The temperature of the battery energy storage module will continue to increase. To a certain extent, as the temperature of the battery energy storage module increases, the energy storage efficiency of the battery energy storage module will gradually decrease. For this reason, the operation of the photovoltaic storage connection module, the battery energy storage module and the liquid cooling module are respectively controlled by the control module, and the liquid cooling module is used to perform water cooling heat exchange on the battery energy storage module to maintain the operating temperature of the battery energy storage module and avoid the temperature of the battery energy storage module being too high. Based on the current energy storage temperature of the battery energy storage module, the control module is used to respectively match the charging and discharging power of the battery energy storage module and the operating power of the liquid cooling module, so as to maximize the charging and discharging efficiency of the battery energy storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of electrical connections of an embodiment of the present application.

[0023] Figure numerals: 1. Photovoltaic energy storage connection module; 2. Battery energy storage module; 3. Liquid cooling module; 4. Control module. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.

[0026] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] A multifunctional integrated liquid-cooled optical storage system, see Figure 1 ,include:

[0029] The photovoltaic storage connection module 1 converts and transmits the electricity converted by the photovoltaic module;

[0030] A battery energy storage module 2 electrically connected to the photovoltaic storage connection module 1, wherein the battery energy storage module 2 stores the electricity converted by the photovoltaic module, and the battery energy storage module 2 is electrically connected to a load;

[0031] The liquid cooling module 3 performs water cooling heat exchange on the battery energy storage module 2 to maintain the operating temperature of the battery energy storage module 2;

[0032] The control module 4 is electrically connected to the photovoltaic energy storage connection module 1, the battery energy storage module 2 and the liquid cooling module 3, respectively, to control the operation of the photovoltaic energy storage connection module 1, the battery energy storage module 2 and the liquid cooling module 3;

[0033] Based on the temperature of the energy stored in the battery energy storage module 2 , the control module 4 respectively matches the charging and discharging power of the battery energy storage module 2 and the operating power of the liquid cooling module 3 .

[0034] In this embodiment, the photovoltaic module is converted and transmitted by the photovoltaic module through the photovoltaic energy storage connection module 1, and the photovoltaic module is converted and stored by the battery energy storage module 2. At the same time, the battery energy storage module 2 is electrically connected to the load to provide electrical energy for the load, so as to achieve the purpose of popularizing the application of the electricity converted by the photovoltaic module;

[0035] The battery energy storage module 2 receives the electricity converted by the photovoltaic components through the photovoltaic storage connection module 1, and then applies it through the load, so as to continue operating. The temperature of the battery energy storage module 2 will continue to increase. To a certain extent, as the temperature of the battery energy storage module 2 increases, the energy storage efficiency of the battery energy storage module 2 will gradually decrease. For this reason, the control module 4 controls the operation of the photovoltaic storage connection module 1, the battery energy storage module 2 and the liquid cooling module 3 respectively, and uses the liquid cooling module 3 to perform water cooling heat exchange on the battery energy storage module 2 to maintain the operating temperature of the battery energy storage module 2 and avoid the temperature of the battery energy storage module 2 being too high. Based on the energy storage temperature of the battery energy storage module 2, the control module 4 matches the charging and discharging power of the battery energy storage module 2 and the operating power of the liquid cooling module 3 respectively, so as to maximize the charging and discharging efficiency of the battery energy storage module 2.

[0036] The charging and discharging power of the battery energy storage module 2 includes charging power and discharging power, wherein the charging power is set in the following manner:

[0037] Pre-charging stage: used to start charging at a low current when the battery energy storage module 2 is very low in power. This helps prevent the battery energy storage module 2 from being damaged by excessive charging current.

[0038] Fast charging stage: In this stage, the battery energy storage module 2 receives the maximum allowable charging current until the battery voltage approaches the set target voltage, and fast charging is performed.

[0039] Constant voltage charging stage: When the battery voltage reaches the target voltage, the charger switches to constant voltage mode and the current gradually decreases until the battery is fully charged.

[0040] The discharge power prevents the battery energy storage module 2 from over-discharging by setting an upper limit of the discharge power, and adjusts the load device or the operating state of the load through the control module 4 to adapt to the discharge capacity of the battery.

[0041] Based on the charging and discharging power mode of the above-mentioned battery energy storage module 2, the charging and discharging power of the battery energy storage module 2 is adjusted by controlling the load and the photovoltaic storage connection module 1 through the control module 4.

[0042] In addition, the battery energy storage module 2 is a lithium-ion battery or a ternary lithium battery, a lead-acid battery, a lithium iron phosphate battery, a sodium-sulfur battery, etc., and the control module 4 is a controller.

[0043] Specifically, multiple temperature monitoring areas are established and distributed on the battery energy storage module 2, multiple temperature monitoring points are set in each of the temperature monitoring areas, and temperature detection values ​​of different positions on the temperature monitoring points are obtained by temperature sensors. Based on the temperature detection values, the temperature distribution of the battery energy storage module 2 is determined.

[0044] In this embodiment, the battery energy storage module 2 is divided into areas, a plurality of temperature monitoring areas are established on the battery energy storage module 2, and a plurality of temperature monitoring points are set in each of the temperature monitoring areas. The temperature detection values ​​at different positions on the temperature monitoring points are obtained by using a temperature sensor, and the sensed temperature of the temperature monitoring area is detected by using the detected temperature detection values.

[0045] Based on this, the temperature values ​​of each temperature monitoring area on the battery energy storage module 2 are determined to monitor the temperature of the battery energy storage module 2.

[0046] Specifically, based on the acquired temperature detection values, the average temperature t0 of each temperature monitoring area is calculated. The control module 4 is provided with a plurality of preset temperatures t1-tn. The power operation size of the liquid cooling module 3 is controlled by the control module 4, and adaptive operating power matching is performed by comparing the temperature of each temperature monitoring area with the preset temperature.

[0047] In this embodiment, at least three preset temperatures are set in the control module 4, namely t1, t2 and t3, wherein the t1 setting temperature is less than 10°C; the t2 setting temperature is 10°C to 30°C; and the t3 setting temperature is greater than 30°C. There are at least three temperature monitoring points in the same temperature monitoring area.

[0048] Based on the settings of three preset temperatures, when the temperature of the temperature monitoring area corresponds to t1, the control module 4 controls the liquid cooling module 3 to operate at low power; when the temperature of the temperature monitoring area corresponds to t2, the control module 4 controls the liquid cooling module 3 to operate at normal power; when the temperature of the temperature monitoring area corresponds to t3, the control module 4 controls the liquid cooling module 3 to operate at high power.

[0049] Specifically, according to the control of the control module 4, a preset time interval is set to obtain the temperature detection value of each temperature monitoring point on each temperature monitoring area, the average temperature of each temperature monitoring area is temporarily stored, and the increase rate y of the average temperature of the same temperature monitoring area is calculated based on the preset time interval before and after. According to the size of the increase rate y, the liquid cooling module 3 is controlled by the control module 4 to match the corresponding operating power.

[0050] The temperature detection value of each temperature monitoring point can be monitored in real time, but there will be a lot of detected values. In order to avoid redundant data, an interval preset time is set, that is, the time of recording the temperature detection values ​​of the same temperature monitoring point twice before and after. The interval preset time in this embodiment is ten minutes. The interval preset time can be customized according to your own needs.

[0051] Using the ten-minute interval before and after, collect the temperature detection values ​​twice, calculate the increase rate y of the average temperature in the same temperature monitoring area, and control the liquid cooling module 3 to match the corresponding operating power through the control module 4 according to the size of the increase rate y.

[0052] Assume that the temperature detection value in the previous ten minutes is T1, and the current temperature detection value is T2, and the increase rate y is (T2-T1)\T1.

[0053] By setting the increase rate, the subsequent temperature increase trend of the battery energy storage module 2 can be predicted. In the mode of the traditional liquid cooling module 3, the instant temperature is measured, that is, after the current temperature is measured, the control module 4 responds quickly according to the current temperature to control the matching power of the liquid cooling module 3 corresponding to the current temperature. This process makes the water cooling heat exchange method of the liquid cooling module 3 untimely due to the reaction between the control modules 4 and the setting of the preset interval time. Therefore, by predicting the subsequent temperature increase trend of the battery energy storage module 2 and setting the interval value of the increase rate y, the low-power operation, normal-power operation and high-power operation modes of the liquid cooling module 3 are corresponded.

[0054] Considering that the temperature detection value of a single point is not sufficient to represent the temperature of the temperature monitoring area, the average temperature t0 of each temperature monitoring area is used as the technical basis for determining the increase rate y.

[0055] Specifically, a comparison difference z is performed based on the temperature detection values ​​of multiple temperature monitoring points in the same temperature monitoring area, and a preset difference value z1 is used; when z≥z1, the control module 4 controls to increase the operating power of the liquid cooling module 3.

[0056] Since the temperature sensor performs temperature monitoring at each temperature monitoring point, in order to avoid excessive local temperature in the same temperature monitoring area, a difference value z1 is set, where z1 is 5°C, and the temperature detection values ​​of multiple temperature monitoring points in the same temperature monitoring area are used to compare the difference z. When z≥z1, the control module 4 controls the increase of the operating power of the liquid cooling module 3 to balance the operating temperature in the same temperature monitoring area and improve the charging and discharging efficiency of the battery energy storage module 2.

[0057] Specifically, the comparison difference z is a comparison difference between a highest temperature detection value thigh and a lowest temperature detection value tlow among the temperature detection values ​​of the multiple temperature monitoring points.

[0058] This embodiment uses the highest temperature detection value thigh and the lowest temperature detection value tlow in the same temperature monitoring area, z=thigh-tlow.

[0059] Specifically, based on the same temperature monitoring area, the average temperature t_avg of the current highest temperature detection value t_high and the current lowest temperature detection value t_low is compared with the average temperature T0, and the detection abnormality of the temperature monitoring point is judged by comparing the magnitudes of the values. The average temperature T0 is calculated by taking the average of the current highest temperature detection value t_high and the temperature detection value t_low of the current lowest temperature after division.

[0060] Since each temperature monitoring point is operated independently by each temperature sensor, to avoid abnormalities in the temperature sensors at the temperature monitoring points, the detection abnormality of the temperature monitoring points is achieved through the temperature comparison difference between t_avg and the average temperature T0. The larger the difference between t_avg and the average temperature T0, the more likely there are abnormalities in the temperature monitoring points that collect the t_high temperature and the t_low temperature corresponding to the detected temperature monitoring point.

[0061] Specifically, the control module 4 is connected to the central console, and the detection abnormality is displayed on the central console through the control module 4 to remind the detection personnel to perform fixed-point maintenance.

[0062] After an abnormality occurs in the temperature monitoring point, to ensure the normal operation of the photovoltaic energy storage system, it needs to be repaired immediately. Therefore, in the form of the central console, the temperature monitoring points with abnormalities on the battery energy storage module 2 are displayed for later processing.

[0063] The low-power operation, normal-power operation, and high-power operation modes of the liquid cooling module 3 are three-level adjustments of the operating power of the corresponding liquid cooling module 3 set in this embodiment.

[0064] The power control of the liquid cooling module 3 is controlled by the following methods:

[0065] The liquid cooling module 3 includes water flow control, coolant temperature control, and heat exchanger control.

[0066] The water flow control is based on an electric pump equipped in the liquid cooling system to push the coolant to flow. Controlling the speed of the electric pump can adjust the flow rate, thereby changing the cooling effect, and an adjustable valve is used to adjust the flow rate of the coolant to optimize the cooling efficiency.

[0067] The coolant temperature control optimizes the heat exchange efficiency by controlling the temperature of the coolant.

[0068] The heat exchanger control is that the radiator in the liquid cooling system improves the heat exchange efficiency by adjusting the working state of the radiator.

[0069] The photovoltaic energy storage connection module 1 is an inverter that converts the direct current generated by the photovoltaic module into direct current or alternating current with a voltage and frequency suitable for the photovoltaic energy storage system or the power grid.

[0070] The above embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A multifunctional integrated liquid-cooled light storage system, characterized by: include: The photovoltaic storage connection module converts and transmits the electricity converted by the photovoltaic modules; A battery energy storage module electrically connected to the photovoltaic storage connection module, the battery energy storage module stores the electricity converted by the photovoltaic module, and the battery energy storage module is electrically connected to a load; Liquid cooling module, which performs water cooling and heat exchange on the battery energy storage module to maintain the operating temperature of the battery energy storage module; A control module, electrically connected to the photovoltaic energy storage connection module, the battery energy storage module and the liquid cooling module, respectively, to control the operation of the photovoltaic energy storage connection module, the battery energy storage module and the liquid cooling module; Based on the temperature of energy storage of the battery energy storage module, the control module is used to respectively match the charging and discharging power of the battery energy storage module and the operating power of the liquid cooling module.

2. The multifunctional integrated liquid-cooled optical storage system according to claim 1 is characterized in that: Based on the establishment and distribution of multiple temperature monitoring areas on the battery energy storage module, multiple temperature monitoring points are set in each of the temperature monitoring areas, and temperature detection values ​​of different positions on the temperature monitoring points are obtained by temperature sensors. Based on the temperature detection values, the temperature distribution of the battery energy storage module is determined.

3. The multifunctional integrated liquid-cooled optical storage system according to claim 2 is characterized in that: Based on the acquired temperature detection values, the average temperature t0 of each temperature monitoring area is calculated. The control module is provided with a plurality of preset temperatures t1-tn. The power operation size of the liquid cooling module is controlled by the control module, and adaptive operation power matching is performed in conjunction with the comparison between each temperature monitoring area and the preset temperature.

4. The multifunctional integrated liquid-cooled optical storage system according to claim 3 is characterized by: According to the control of the control module, the preset time interval is set to obtain the temperature detection value of each temperature monitoring point on each temperature monitoring area, the average temperature of each temperature monitoring area is temporarily stored, and the increase rate y of the average temperature of the same temperature monitoring area is calculated based on the preset time interval before and after. According to the size of the increase rate y, the control module is used to control the liquid cooling module to match the corresponding operating power.

5. The multifunctional integrated liquid-cooled optical storage system according to claim 4 is characterized in that: A comparison difference z is performed based on the temperature detection values ​​of multiple temperature monitoring points in the same temperature monitoring area, and a preset difference value z1 is used; when z≥z1, the control module controls to increase the operating power of the liquid cooling module.

6. The multifunctional integrated liquid-cooled optical storage system according to claim 5 is characterized in that: The comparison difference z is based on the highest temperature detection value t among the temperature detection values ​​of multiple temperature monitoring points. 高 and the minimum temperature detection value t 低 The comparison difference between .

7. The multifunctional integrated liquid-cooled optical storage system according to claim 6 is characterized in that: Based on the same temperature monitoring area, the current highest temperature detection value t 高 and the current minimum temperature detection value t 低 The average value of 平 Compared with the average temperature T0, the detection abnormality of the temperature monitoring point is judged by comparing the value. The average temperature T0 is calculated by subtracting the current maximum temperature detection value t 高 and the current lowest temperature detection value t 低 The average temperature after removal.

8. The multifunctional integrated liquid-cooled optical storage system according to claim 7 is characterized in that: The control module is connected to a central console, and detection abnormalities are displayed on the central console through the control module, thereby reminding the inspection personnel to perform fixed-point maintenance.

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