Energy storage cabinet thermal energy control system and method

Abstract

The present invention belongs to the technical field of energy storage cabinets, specifically a thermal energy control system and method for an energy storage cabinet equipped with an energy storage battery. The system comprises: a refrigeration mechanism; a battery heat exchange circuit connected to the refrigeration mechanism for providing thermal energy exchange for the energy storage battery; a PCS heat exchange circuit connected to the refrigeration mechanism for providing thermal energy exchange for the PCS; and a thermal energy storage circuit with a built-in refrigerant connected to the refrigeration mechanism for storing thermal energy generated by the refrigeration mechanism during periods of flat or low power supply; the thermal energy storage circuit and the battery heat exchange circuit share a refrigerant; and solenoid valves are provided on each of the battery heat exchange circuit, the PCS heat exchange circuit, and the thermal energy storage circuit for regulating the flow rates of the three circuits based on the optimal operating temperature of the energy storage battery and the PCS under the current ambient temperature. The present invention aims to at least address the problem of high power consumption during operation of the energy storage cabinet liquid cooler, which affects the benefits of energy storage users.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage cabinets, and specifically relates to a thermal energy control system and method for an energy storage cabinet. Background Art

[0002] Energy storage cabinets are fundamental energy storage units in power systems. They house a PCS (energy storage alternator) and energy storage batteries. These batteries generate significant heat during operation, hindering their efficiency in high-temperature environments. Currently, energy storage batteries on the market primarily dissipate heat through air cooling. Some manufacturers have developed liquid cooling, which uses a liquid cooler and then cools the battery with cold water, ensuring it operates at a reasonable temperature.

[0003] Currently, liquid cooling is used, and the energy storage battery is started when it is at a high temperature. If it is started during the day, due to the high outside ambient temperature, the liquid cooling mechanism consumes a lot of electricity, which increases the user's electricity expenditure and affects the income of energy storage users to a certain extent. Summary of the Invention

[0004] The present invention aims to solve the problem that the energy storage cabinet liquid cooler consumes a lot of electricity when working, which affects the benefits of energy storage users.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: On one hand, the present invention provides a thermal energy control system for an energy storage cabinet, which is used for an energy storage cabinet equipped with an energy storage battery, comprising:

[0006] Refrigeration mechanism, having cooling and / or heating functions;

[0007] A battery heat exchange circuit, connected to the refrigeration mechanism, is used to provide heat energy exchange for the energy storage battery;

[0008] A PCS heat exchange circuit is connected to the refrigeration mechanism to provide heat energy exchange for the PCS; and

[0009] A thermal energy storage circuit with a built-in refrigerant is connected to the refrigeration mechanism and is used to store the thermal energy generated by the refrigeration mechanism during periods of flat or low power supply;

[0010] The thermal energy storage circuit and the battery heat exchange circuit share a refrigerant;

[0011] Solenoid valves are respectively provided on the battery heat exchange circuit, PCS heat exchange circuit and thermal energy storage circuit, which are used to regulate the flow of the three circuits according to the optimal operating temperature of the energy storage battery and PCS under the current ambient temperature, and release the heat energy generated during the flat or off period of power supply through the thermal energy storage circuit when needed by the energy storage battery and PCS.

[0012] Preferably, the battery heat exchange circuit and the PCS heat exchange circuit are independent of each other, and each uses an independent refrigerant to complete heat energy exchange.

[0013] Preferably, the refrigeration mechanism includes a cold-end heat energy exchange part and a hot-end heat energy exchange part.

[0014] Preferably, the battery heat exchange circuit is divided into a battery heat exchange side and a first heat exchange side; the PCS heat exchange circuit is divided into a PCS heat exchange side and a second heat exchange side;

[0015] The first heat exchange side and the second heat exchange side are respectively attached to the cold end heat energy exchange part of the refrigeration mechanism;

[0016] Or the first heat exchange side and the second heat exchange side are both attached to the cold end heat energy exchange part and the hot end heat energy exchange part of the refrigeration mechanism.

[0017] Preferably, the thermal energy storage circuit includes a liquid storage tank with a built-in refrigerant and a liquid inlet pipe and a liquid outlet pipe connected to the liquid storage tank; the liquid inlet pipe is connected to the first heat exchange side, and the liquid outlet pipe is connected to the battery heat exchange side.

[0018] Preferably, a heat-insulating layer is provided inside the liquid storage tank; the heat-insulating layer mitigates the effect of the external ambient temperature on the refrigerant inside the liquid storage tank.

[0019] Based on the above energy storage cabinet thermal energy control system, the present invention further provides an energy storage cabinet thermal energy control method, comprising the following steps:

[0020] S100, setting the ideal operating temperature range of the energy storage battery to a first temperature range, and the ideal operating temperature range of the PCS to a second temperature range;

[0021] S200: Real-time detection to obtain the ambient temperature of the energy storage cabinet, the temperature of the energy storage battery, the PCS temperature, and the refrigerant temperature in the liquid storage tank;

[0022] S300: If the detected temperature of the energy storage battery is less than the first temperature range in step S100, the battery heat exchange circuit and the refrigeration mechanism are activated, and the first heat exchange side transfers heat energy to the battery heat exchange side through the hot end heat energy exchange part to heat the energy storage battery;

[0023] S400: If the detected temperature of the energy storage battery is greater than the first temperature range in step S100, the battery heat exchange circuit and the refrigeration mechanism are activated, and heat energy from the battery heat exchange side is transferred to the first heat exchange side. The first heat exchange side dissipates the heat energy through the cold end heat exchange part to cool the energy storage battery;

[0024] S500: If the detected PCS temperature value is less than the second temperature range in step S100, the PCS heat exchange circuit and the refrigeration mechanism are started, and the second heat exchange side transfers heat energy to the PCS heat exchange side through the hot end heat energy exchange part to heat the PCS;

[0025] S600: If the detected PCS temperature value is greater than the second temperature range in step S100, the PCS heat exchange circuit and the refrigeration mechanism are started, and the heat energy on the PCS heat exchange side is transferred to the second heat exchange side. The second heat exchange side dissipates the heat energy through the cold end heat exchange part to cool the PCS.

[0026] Preferably, after detecting and obtaining the refrigerant temperature value in the liquid storage tank in step S200;

[0027] In step S300, if the detected energy storage battery temperature is lower than the first temperature range in step S100 and lower than the refrigerant temperature, the thermal energy storage circuit is activated first. The heat energy in the liquid storage tank flows from the liquid outlet pipe to the battery heat exchange side through the refrigerant to heat the energy storage battery.

[0028] In step S400, if the detected energy storage battery temperature value is greater than the first temperature range in step S100 and greater than the refrigerant temperature value, the thermal energy storage circuit is activated first, and the refrigerant flows from the liquid outlet pipe to the battery heat exchange side. The heat energy on the battery heat exchange side is transferred to the refrigerant, and the refrigerant flows back to the liquid storage tank to dissipate the heat energy, thereby cooling the energy storage battery.

[0029] Preferably, in step S200;

[0030] If the detected external ambient temperature value is lower than the lower limit of the first temperature range, during the power off period, the thermal energy storage circuit and the refrigeration mechanism are activated. After the refrigerant flows through the first heat exchange side, it absorbs the heat energy of the hot end heat energy exchange part and flows back to the liquid storage tank, completing the heat energy storage until the refrigerant temperature value in the liquid storage tank reaches the first temperature range;

[0031] If the detected external ambient temperature value is greater than the upper limit of the first temperature range, the thermal energy storage circuit and the refrigeration mechanism are started during the low power supply period. After the refrigerant flows through the first heat exchange side, the cold end heat energy exchange part absorbs the heat energy of the refrigerant, and the refrigerant flows back to the liquid storage tank, completing the refrigerant cooling until the refrigerant temperature value in the liquid storage tank reaches the first temperature range.

[0032] Preferably, the first temperature range is 20°C~30°C; the second temperature range is 15°C~35°C.

[0033] The beneficial effects achieved by the present invention using the above structure are as follows: the energy storage cabinet can automatically control the temperature according to the temperature of the energy storage battery, PCS and refrigerant in the liquid storage tank. The battery module can discharge more electricity during the peak period of the day, improve the efficiency of the whole machine, and generate more direct economic value. At the same time, the liquid storage tank can also complete heat storage during the power supply off-peak period, which is used to release heat energy to the energy storage battery and PCS during the power supply peak period. The low price of electricity at night is used to achieve the insulation effect in the liquid storage tank. The water temperature of the water tank is cooled or heated, and different water temperatures are used to achieve cooling and heating of the battery module in different seasons, thereby improving the working efficiency of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a connection block diagram of the thermal energy control system of the energy storage cabinet according to the first embodiment of the present invention;

[0035] Figure 2 This is a flowchart of a method for controlling thermal energy in an energy storage cabinet according to a second embodiment of the present invention;

[0036] Figure 3 This is a connection block diagram of the first implementation method in step S300 of the energy storage cabinet thermal energy control method according to the second embodiment of the present invention;

[0037] Figure 4 This is a connection block diagram of the second implementation method of step S300 of the energy storage cabinet thermal energy control method in embodiment 2 of the present invention;

[0038] Figure 5 This is a connection block diagram of the third implementation method in step S300 of the energy storage cabinet thermal energy control method according to the second embodiment of the present invention;

[0039] Figure 6 This is a connection block diagram of the fourth implementation method in step S300 of the energy storage cabinet thermal energy control method according to the second embodiment of the present invention;

[0040] Figure 7 This is a connection block diagram of the fifth implementation method in step S300 of the energy storage cabinet thermal energy control method according to embodiment 2 of the present invention;

[0041] Figure 8 This is a connection block diagram of the sixth implementation method in step S300 of the energy storage cabinet thermal energy control method according to the second embodiment of the present invention;

[0042] Figure 9 This is a diagram of the deployed state of the energy storage cabinet in the third embodiment of the present invention;

[0043] Figure 10 This is an expanded front view of the energy storage cabinet in Example 3 of the present invention;

[0044] Figure 11 This is a cross-sectional view of the energy storage cabinet in Example 3 of the present invention.

[0045] Among them, 100, refrigeration mechanism, 110, cold-end heat energy exchange part, 120, hot-end heat energy exchange part; 200, battery heat exchange circuit, 210, battery heat exchange side, 220, first heat exchange side; 300, PCS heat exchange circuit, 310, PCS heat exchange side, 320, second heat exchange side; 400, thermal energy storage circuit, 2, liquid storage tank, 3, liquid inlet pipe, 4, liquid outlet pipe; 500, energy storage battery; 600, PCS; 1, energy storage cabinet, 11, battery module, 111, module water inlet, 112, module water outlet, 12, energy storage inverter, 21, insulation layer, 22, water supply port, 5, liquid cooler, 6, module water pipe, 7, PCS water pipe. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] Example 1

[0048] Currently, liquid cooling is used, and the energy storage battery is started when it is at a high temperature. If it is started during the day, due to the high outside ambient temperature, the liquid cooling mechanism consumes a lot of electricity, which increases the user's electricity expenditure and affects the income of energy storage users to a certain extent.

[0049] See also Figure 1 In response to the above technical problems, this embodiment proposes a thermal energy control system for an energy storage cabinet, which is used for an energy storage cabinet with an energy storage battery 500 installed inside. The system includes: a refrigeration mechanism 100, a battery heat exchange circuit 200, a PCS heat exchange circuit 300, and a thermal energy storage circuit 400.

[0050] The refrigeration mechanism 100 includes a cold-end heat energy exchange portion 110 and a hot-end heat energy exchange portion 120 , and has cooling and / or heating functions.

[0051] The battery heat exchange circuit 200 is connected to the refrigeration mechanism 100 to provide heat exchange for the energy storage battery 500. In low-temperature environments, the internal resistance of the energy storage battery 500 increases, and its charge and discharge performance decreases. Therefore, when starting at low temperatures, the energy storage battery 500 needs to be preheated. In this case, the battery heat exchange circuit 200 is connected to the hot-end heat exchange unit 120 of the refrigeration mechanism 100. In high-temperature environments, or during continuous operation, the temperature of the energy storage battery 500 may exceed the ideal operating temperature, requiring cooling. In this case, the battery heat exchange circuit 200 is connected to the cold-end heat exchange unit 110 of the refrigeration mechanism 100.

[0052] Specifically, the battery heat exchange circuit 200 is divided into a battery heat exchange side 210 and a first heat exchange side 220. The battery heat exchange side 210 is located at the energy storage battery 500 and is used to exchange heat with the energy storage battery 500. The first heat exchange side 220 is located at the refrigeration mechanism 100 and is used to absorb or dissipate heat as needed. Therefore, when the energy storage battery 500 needs to be cooled, the first heat exchange side 220 is attached to the cold-end heat exchange section 110 of the refrigeration mechanism 100. When the energy storage battery 500 needs to be preheated, the first heat exchange side 220 is attached to the hot-end heat exchange section 120 of the refrigeration mechanism 100. In actual installation, the battery heat exchange circuit 200 must be fixed, and the piping cannot be replaced as needed. Therefore, in this embodiment, the first heat exchange side 220 is attached to both the cold-end heat exchange section 110 and the hot-end heat exchange section 120 of the refrigeration mechanism 100. A solenoid valve installed on the battery heat exchange circuit 200 switches the operating mode.

[0053] The PCS heat exchange circuit 300 is connected to the refrigeration mechanism 100 to provide heat exchange for the PCS 600. Similarly, when the PCS 600 is in a low or high temperature state and needs to be preheated or cooled, the structure of the connection to the refrigeration mechanism 100 is the same as that of the battery heat exchange circuit 200.

[0054] Specifically, the PCS heat exchange circuit 300 is divided into a PCS heat exchange side 310 and a second heat exchange side 320. The PCS heat exchange side 310 is located at the PCS 600 and is used to exchange heat with the PCS 600. The second heat exchange side 320 is located at the refrigeration mechanism 100 and is used to absorb or dissipate heat as needed. Therefore, when the PCS 600 needs to be cooled, the second heat exchange side 320 is attached to the cold-end heat exchange section 110 of the refrigeration mechanism 100. When the PCS 600 needs to be preheated, the second heat exchange side 320 is attached to the hot-end heat exchange section 120 of the refrigeration mechanism 100. In actual installation, the PCS heat exchange circuit 300 also requires a fixed installation, and the piping cannot be replaced as needed. Therefore, in this embodiment, the second heat exchange side 320 is attached to both the cold-end heat exchange section 110 and the hot-end heat exchange section 120 of the refrigeration mechanism 100, and the operating mode is switched by a solenoid valve installed on the PCS heat exchange circuit 300.

[0055] Unlike the energy storage battery 500, the ideal operating temperature range of the PCS 600 is larger than the ideal operating temperature range of the energy storage battery 500. Therefore, in this embodiment, the battery heat exchange circuit 200 and the PCS heat exchange circuit 300 are independent of each other and use independent refrigerants to complete heat exchange.

[0056] The thermal energy storage circuit 400 contains a refrigerant and is connected to the refrigeration mechanism 100 to store the heat energy generated by the refrigeration mechanism 100 during periods of flat or low power supply. It should be noted that the charging and discharging of the energy storage battery 500 is significantly affected by temperature, requiring a significant amount of energy to preheat or cool it. However, the PCS 600 requires less energy for temperature control. Therefore, in this embodiment, the thermal energy storage circuit 400 and the battery heat exchange circuit 200 share a refrigerant, with the thermal energy storage circuit 400 being used first to preheat or cool the battery, followed by the refrigeration mechanism 100.

[0057] In the thermal energy storage circuit 400, the refrigerant is temperature-controlled by the refrigeration mechanism 100, and thermal energy is stored in the refrigerant. That is, at high temperatures, the refrigerant is cooled by the refrigeration mechanism 100 and stored in the thermal energy storage circuit 400; at low temperatures, the refrigerant is heated by the refrigeration mechanism 100 and stored in the thermal energy storage circuit 400. When the energy storage battery 500 needs to be preheated or cooled, the thermal energy in the refrigerant is released through the thermal energy storage circuit 400.

[0058] Specifically, the thermal energy storage circuit 400 includes a liquid storage tank 2 containing refrigerant, and a liquid inlet pipe 3 and a liquid outlet pipe 4 connected to the liquid storage tank 2. The liquid inlet pipe 3 is connected to the first heat exchange side 220 to achieve heat exchange between the refrigerant and the refrigeration mechanism 100; the liquid outlet pipe 4 is connected to the battery heat exchange side 210 to share the refrigerant with the battery heat exchange circuit 200.

[0059] A heat-insulating layer may also be provided inside the liquid storage tank 2 to mitigate the effect of the external ambient temperature on the refrigerant inside the liquid storage tank 2 .

[0060] The energy storage cabinet thermal energy control system provided in this embodiment employs solenoid valves installed on the battery heat exchange circuit 200, the PCS heat exchange circuit 300, and the thermal energy storage circuit 400. The battery heat exchange circuit 200 and the PCS heat exchange circuit 300 are independent of each other and both utilize a refrigeration mechanism 100 to perform heat exchange, independently controlling the temperatures of the energy storage battery 500 and the PCS 600. The thermal energy storage circuit 400 also uses a refrigerant to store heat from electricity during periods of parity or low power consumption for use during peak power periods. Solenoid valves are then used to control the flow rates of the three circuits based on the optimal operating temperatures of the energy storage battery 500 and PCS 600 under the current ambient temperature. The thermal energy storage circuit releases heat generated during periods of parity or low power consumption to the energy storage battery and PCS when needed. The three circuits work in pairs to achieve intelligent thermal control within the energy storage cabinet.

[0061] Example 2

[0062] See also Figure 2Based on the above energy storage cabinet thermal energy control system, this embodiment provides an energy storage cabinet thermal energy control method, including the following steps:

[0063] S100 , setting the ideal operating temperature range of the energy storage battery 500 to a first temperature range, and the ideal operating temperature range of the PCS 600 to a second temperature range.

[0064] The normal operating temperature range of the energy storage battery 500 varies depending on the battery type, but generally requires operation between -20°C and 60°C, with optimal performance typically ranging from 10°C to 35°C. Lithium-ion batteries (lithium iron phosphate / ternary lithium), the mainstream energy storage battery 500, operate within a safe range of -20°C to 60°C. However, performance significantly degrades below 0°C or above 45°C. Optimal performance temperatures are: lithium iron phosphate: 20°C to 25°C (optimal capacity and lifespan); ternary lithium: 15°C to 35°C (highest energy density and charge-discharge efficiency). Therefore, in this embodiment, the first temperature range is set to 20°C to 30°C.

[0065] The operating temperature range of the PCS600 directly impacts its performance, efficiency, and reliability. The PCS600's standard operating temperature range: The PCS600 is generally designed to operate from -25°C to +55°C, with some high-performance models extending this range to -30°C to +60°C. Generally, when operating above 45°C, the PCS600 requires derating (reduced power output), otherwise efficiency decreases and overheating protection may be triggered. For example, in high-temperature environments (>50°C), output power may drop below 80% of the rated value.

[0066] In cold and high-altitude areas, the PCS600 must have a preheating function, i.e., cold start protection, to prevent capacitor failure or control circuit abnormalities at low temperatures. In high-temperature areas, a forced heat dissipation system, such as liquid cooling, is required. Liquid cooling is more efficient than air cooling and can control the temperature difference of the device within ±3°C to ensure full power operation.

[0067] For this purpose, the second temperature range is set to 15°C~35°C.

[0068] S200 , real-time detection to obtain the ambient temperature of the energy storage cabinet, the temperature of the energy storage battery 500 , the temperature of the PCS 600 , and the temperature of the refrigerant in the liquid storage tank 2 .

[0069] This step requires the use of multiple temperature sensors to complete temperature detection and acquisition.

[0070] For example, the ambient temperature outside the energy storage cabinet can be obtained by using temperature sensors installed inside and outside the energy storage cabinet housing.

[0071] The temperature values ​​of the energy storage battery 500 and PCS600 can be measured by contact temperature measurement solutions such as NTC thermistors, PT100 platinum resistors, and thermocouples, or by non-contact temperature measurement solutions such as infrared thermal imaging and fiber grating sensors. New technologies such as surface acoustic wave sensors and AI temperature prediction models can also be used to achieve temperature measurement.

[0072] It should be noted that since there are multiple energy storage batteries 500 and PCS600, step S300 is triggered after the temperature value is obtained. This temperature value is not the average of the multiple obtained temperatures, but the highest value among the multiple temperature values. For example, after detecting the temperature values ​​of 10 energy storage batteries 500, one of the energy storage batteries 500 has a temperature value exceeding 30°C, and the remaining 9 energy storage batteries 500 have temperature values ​​below 30°C. At this time, step S300 will still be triggered. The same applies to the PCS600 temperature value.

[0073] The temperature value of the refrigerant in the liquid storage tank 2 can be obtained by providing a temperature sensor in the liquid storage tank 2 or at the inlet or outlet.

[0074] S300: If the detected temperature value of the energy storage battery 500 is less than the first temperature range in step S100, the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started, and the first heat exchange side 220 transfers heat energy to the battery heat exchange side 210 through the hot end heat energy exchange part 120 to heat the energy storage battery 500.

[0075] like Figure 3 As shown, in this step, the temperature value of the energy storage battery 500 is less than the first temperature range, that is, the temperature of the energy storage battery 500 is lower than 20°C. At this time, the energy storage battery 500 is in a low-temperature operating state and cannot exert its optimal performance. The energy storage battery 500 needs to be heated. At this time, the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started. At this time, the temperature of the refrigerant on the battery heat exchange side 210 is the same as the temperature of the energy storage battery 500. After flowing to the first heat exchange side 220, it passes through the hot end heat energy exchange part 120 of the refrigeration mechanism 100 and absorbs heat energy. After flowing to the first heat exchange side 220 again, the heat energy it carries is transferred to the energy storage battery 500, thereby realizing the heating function of the energy storage battery 500.

[0076] In this step, the battery heat exchange circuit 200 and the refrigeration mechanism 100 need to be started simultaneously, and the power consumption thereof is equal to the sum of the power consumptions of the battery heat exchange circuit 200 and the refrigeration mechanism 100 .

[0077] like Figure 4As shown, as a preferred solution, if the detected temperature of the energy storage battery 500 is less than the first temperature range in step S100 and less than the temperature of the refrigerant in the liquid storage tank 2, it can be determined that the liquid storage tank 2 in the thermal energy storage circuit 400 contains refrigerant with a temperature higher than that of the energy storage battery 500. The refrigerant can be preferentially used to heat the energy storage battery 500. In this case, the thermal energy storage circuit 400 is activated first. The refrigerant in the liquid storage tank 2 carries heat energy through the liquid outlet pipe 4 to the battery heat exchange side 210, transferring the carried heat energy to the energy storage battery 500, thereby achieving the heating function of the energy storage battery 500. The power consumption at this time is equal to the sum of the power consumption of the battery heat exchange circuit 200 and the thermal energy storage circuit, which is much less than the power consumption of the refrigeration mechanism 100, thereby achieving the effect of reducing energy consumption.

[0078] When the temperature of the refrigerant in the thermal energy storage circuit 400 is consistent with the temperature of the energy storage battery 500, if it is still lower than the first temperature range, the thermal energy storage circuit 400 is stopped, and the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started.

[0079] S400: If the detected temperature value of the energy storage battery 500 is greater than the first temperature range in step S100, the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started, and the heat energy of the battery heat exchange side 210 is transferred to the first heat exchange side 220. The first heat exchange side 220 dissipates the heat energy through the cold end heat energy exchange part 110 to cool the energy storage battery 500.

[0080] like Figure 5 As shown, in this step, the temperature value of the energy storage battery 500 is greater than the first temperature range, that is, the temperature of the energy storage battery 500 is higher than 30°C. At this time, the energy storage battery 500 is in a high-temperature operating state and cannot exert its optimal performance. The energy storage battery 500 needs to be cooled. At this time, the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started. At this time, the temperature of the refrigerant on the battery heat exchange side 210 is the same as the temperature of the energy storage battery 500. After flowing to the first heat exchange side 220, it passes through the cold end heat energy exchange part 110 of the refrigeration mechanism 100 and releases heat energy. After flowing to the first heat exchange side 220 again, the low-temperature refrigerant takes away the heat energy on the energy storage battery 500, thereby achieving the cooling function of the energy storage battery 500.

[0081] In this step, the battery heat exchange circuit 200 and the refrigeration mechanism 100 need to be started simultaneously, and the power consumption thereof is equal to the sum of the power consumptions of the battery heat exchange circuit 200 and the refrigeration mechanism 100 .

[0082] like Figure 6As shown, as a preferred solution, if the detected temperature value of the energy storage battery 500 is greater than the first temperature range in step S100 and greater than the temperature value of the refrigerant in the liquid storage tank 2, it can be determined that the liquid storage tank 2 in the thermal energy storage circuit 400 contains a refrigerant with a temperature lower than the temperature value of the energy storage battery 500. The refrigerant can be used to cool the energy storage battery 500. At this time, the thermal energy storage circuit 400 is preferentially activated, and the refrigerant flows to the battery heat exchange side 210, taking away the heat energy of the energy storage battery 500 and flowing back to the liquid storage tank 2, thereby achieving the cooling function of the energy storage battery 500.

[0083] The power consumption at this time is equal to the sum of the power consumption of the battery heat exchange circuit 200 and the thermal energy storage circuit, and its power consumption is much less than the power consumption of the refrigeration mechanism 100, thereby achieving the effect of reducing energy consumption.

[0084] When the temperature of the refrigerant in the thermal energy storage circuit 400 is consistent with the temperature of the energy storage battery 500 and is still greater than the first temperature range, the thermal energy storage circuit 400 is stopped and the battery heat exchange circuit 200 and the refrigeration mechanism 100 are started.

[0085] S500: If the detected temperature value of PCS600 is less than the second temperature range in step S100, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 are started, and the second heat exchange side 320 transfers heat energy to the PCS heat exchange side 310 through the hot end heat energy exchange part 120 to heat the PCS600.

[0086] like Figure 7 As shown, in this step, the temperature value of PCS600 is less than the second temperature range, that is, the temperature of PCS600 is lower than 15°C. At this time, PCS600 is in a low-temperature operation state and cannot exert its optimal performance. PCS600 needs to be heated. At this time, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 are started. At this time, the temperature of the refrigerant on the PCS heat exchange side 310 is the same as the temperature of PCS600. After flowing to the second heat exchange side 320, it passes through the hot end heat energy exchange part 120 of the refrigeration mechanism 100 and absorbs heat energy. After flowing to the second heat exchange side 320 again, the heat energy it carries is transferred to PCS600, thereby realizing the heating function of PCS600.

[0087] In this step, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 need to be started simultaneously, and the power consumption thereof is equal to the sum of the power consumptions of the PCS heat exchange circuit 300 and the refrigeration mechanism 100 .

[0088] It should be noted that the ideal operating temperature range of PCS600 is larger than the ideal operating temperature range of the energy storage battery 500. Therefore, only the PCS heat exchange circuit 300 is required to complete the heating or cooling of PCS600, and there is no need to add a thermal energy storage circuit 400. Therefore, in this embodiment, the battery heat exchange circuit 200 and the PCS heat exchange circuit 300 are independent of each other, and each uses an independent refrigerant to complete the heat exchange.

[0089] S600. If the detected temperature value of PCS600 is greater than the second temperature range in step S100, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 are started, and the heat energy of the PCS heat exchange side 310 is transferred to the second heat exchange side 320. The second heat exchange side 320 dissipates the heat energy through the cold end heat energy exchange part 110 to cool the PCS600.

[0090] like Figure 8 As shown, in this step, the temperature value of PCS600 is greater than the second temperature range, that is, the temperature of PCS600 is lower than 35°C. At this time, PCS600 is in a high-temperature operating state and cannot exert its optimal performance. PCS600 needs to be cooled. At this time, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 are started. At this time, the temperature of the refrigerant on the PCS heat exchange side 310 is the same as the temperature of PCS600. After flowing to the second heat exchange side 320, it passes through the cold end heat energy exchange part 110 of the refrigeration mechanism 100 and releases heat energy. After flowing to the second heat exchange side 320 again, PCS600 transfers the heat energy to the low-temperature refrigerant, thereby realizing the cooling function of PCS600.

[0091] In this step, the PCS heat exchange circuit 300 and the refrigeration mechanism 100 need to be started simultaneously, and the power consumption thereof is equal to the sum of the power consumptions of the PCS heat exchange circuit 300 and the refrigeration mechanism 100 .

[0092] As a preferred solution, this embodiment can also fully utilize the difference in peak and valley electricity prices to achieve the effect of reducing operating costs.

[0093] Specifically, if the detected external ambient temperature value is lower than the lower limit of the first temperature range, and the temperature of the refrigerant in the liquid storage tank 2 is also lower than the first temperature range, the thermal energy storage circuit 400 and the refrigeration mechanism 100 are started during the power off period. After the refrigerant flows through the first heat exchange side 220, it absorbs the heat energy of the hot end heat exchange part 120 and flows back to the liquid storage tank 2, completing the heat energy storage until the refrigerant temperature value in the liquid storage tank 2 reaches the first temperature range; if the temperature of the refrigerant in the liquid storage tank 2 is the same as the first temperature range, the thermal energy storage circuit 400 and the refrigeration mechanism 100 can also be started during the power off period to raise the temperature of the refrigerant to the upper limit of the first temperature range again; if the temperature of the refrigerant in the liquid storage tank 2 is higher than the first temperature range, execute steps S100-S600.

[0094] If the detected external ambient temperature value is greater than the upper limit of the first temperature range, and the temperature of the refrigerant in the liquid storage tank 2 is also higher than the first temperature range, the thermal energy storage circuit 400 and the refrigeration mechanism 100 are started during the power off period. After the refrigerant flows through the first heat exchange side 220, the heat energy of the refrigerant is released to the cold end heat exchange part 110, and the low-temperature refrigerant flows back to the liquid storage tank 2, completing the refrigerant cooling until the refrigerant temperature value in the liquid storage tank 2 reaches the first temperature range; if the temperature of the refrigerant in the liquid storage tank 2 is the same as the first temperature range, the thermal energy storage circuit 400 and the refrigeration mechanism 100 can also be started during the power off period to reduce the temperature of the refrigerant to the lower limit of the first temperature range; if the temperature of the refrigerant in the liquid storage tank 2 is lower than the first temperature range, execute steps S100-S600.

[0095] In summary, the energy storage cabinet thermal energy control method provided in this embodiment preferentially activates the thermal energy storage circuit 400 when the energy storage battery 500 and the PCS 600 need to be heated or cooled, thereby reducing the energy consumption caused by the activation of the refrigeration mechanism 100. Furthermore, the thermal energy storage circuit 400 can be activated during periods of parity or low power supply to heat or cool the refrigerant to the temperature required by the energy storage battery 500 and the PCS 600, thereby achieving low-cost energy storage and further reducing the energy consumption of the entire system.

[0096] Example 3

[0097] like Figures 9 to 11 As shown, based on the above-mentioned energy storage cabinet thermal energy control system and method, this embodiment provides an energy-saving energy storage cabinet, including an energy storage cabinet 1, a battery module 11 is provided in the energy storage cabinet 1, and an energy storage converter 12 is further provided in the energy storage cabinet 1. The energy storage converter 12 is arranged at the lower end of the energy storage cabinet 1 and below the battery module 11. The battery module 11 is symmetrically provided with a module water inlet 111 and a module water outlet 112. A liquid storage tank 2 is additionally provided above the energy storage cabinet 1, and a water tank water filling port 22 is provided on the top of the liquid storage tank 2. When the liquid storage tank 2 is not filled with water, the water filling port 22 can be sealed. The liquid storage tank 2 is connected to the energy storage cabinet 1 through the liquid inlet pipe 3 and the liquid outlet pipe 4. The liquid storage tank 2 is provided with an insulation layer 21, which reduces the influence of the external ambient temperature on the water temperature inside the liquid storage tank 2. A liquid cooler 5 is provided in the energy storage cabinet 1. The liquid cooler 5 is connected to the energy storage converter 12 through the PCS water pipe 7. The liquid cooler 5 is connected to the battery module 11 in the energy storage cabinet 1 through the module water pipe 6. The liquid cooler 5 is connected to the liquid inlet pipe 3 and the liquid outlet pipe 4. The module water inlet 111 and the module water outlet 112 are respectively connected to the liquid cooler 5 through the module water pipe 6.

[0098] It should be noted that the positions of the liquid inlet pipe 3 and the liquid outlet pipe 4 in this embodiment are different. The water in the liquid storage tank 2 changes density due to thermal expansion and contraction. When heated, the volume of water expands, and its density decreases compared to cold water. Therefore, hot water will float in cold water, and conversely, cold water will sink in hot water. Therefore, in the liquid storage tank 2, the warm water will be at the top and the cold water will be at the bottom. To this end, the water inlet height of the liquid inlet pipe 3 is lower than the water inlet height of the liquid outlet pipe 4. Using this installation structure can fully utilize the hot and cold water in the liquid storage tank 2 and avoid energy waste caused by mixing of hot and cold water.

[0099] There are two specific situations:

[0100] In the summer, when the ambient temperature is high, after the energy storage cabinet 1 is fully charged, the liquid cooler 5 takes advantage of the off-peak electricity price to cool the water to a relatively low temperature. During the daytime peak electricity price period, when discharging, the cold water inside the liquid storage tank 2 is used to dissipate heat from the battery module 11 through the liquid cooler 5. Since the water temperature is relatively low, the main function of the liquid cooler 5 is to compensate for the temperature difference and circulate the water, which greatly reduces the power consumption of the liquid cooler 5.

[0101] In winter, when the ambient temperature is relatively low, the liquid cooler 5 is needed to heat the battery to keep it at a reasonable operating temperature and improve the battery activity. At this time, the low electricity price is used to increase the water temperature through the liquid cooler 5 and store it in the liquid storage tank 2. During the daytime peak period of electricity price, when the battery module 11 needs to be heated at the beginning of discharge, the warm water in the liquid storage tank 2 is used to heat the battery module 11, thereby reducing the power consumption of heating. After the battery module 11 has worked for a period of time, the heat generated by the battery module 11 itself can meet the normal operation of the battery module 11. The excess heat is circulated through the liquid cooler 5 and stored in the energy storage cabinet 1.

[0102] In addition, the energy storage inverter 12 uses liquid cooling to dissipate heat, which does not require increasing the cooling capacity of the energy storage inverter 12 and does not generate additional electricity consumption. The liquid cooling system of the energy storage inverter 12 is not interconnected with the liquid cooling system of the battery module 11. Specifically, a heat exchanger rapid water pump is added to the air outlet of the liquid cooler 5 to allow the air volume of the liquid cooler 5 itself to cool the water in the energy storage inverter 12 system. At this time, the water temperature of the energy storage inverter 12 will be higher than the water temperature on the battery module 11 side, but it will not affect the normal operation of the energy storage inverter 12.

[0103] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0104] Unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.

[0105] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A thermal energy control system for an energy storage cabinet, used for an energy storage cabinet equipped with an energy storage battery, characterized by: include: Refrigeration mechanism, having cooling and / or heating functions; A battery heat exchange circuit, connected to the refrigeration mechanism, is used to provide heat energy exchange for the energy storage battery; The PCS heat exchange circuit is connected to the refrigeration mechanism to provide heat energy exchange for the PCS; as well as A thermal energy storage circuit with a built-in refrigerant is connected to the refrigeration mechanism and is used to store the thermal energy generated by the refrigeration mechanism during periods of flat or low power supply; The thermal energy storage circuit and the battery heat exchange circuit share a refrigerant; Solenoid valves are respectively provided on the battery heat exchange circuit, PCS heat exchange circuit and thermal energy storage circuit to regulate the flow of the three circuits according to the optimal operating temperature of the energy storage battery and PCS under the current ambient temperature, and to release the heat generated during the flat or off period of power supply to the energy storage battery and PCS when needed through the thermal energy storage circuit; The battery heat exchange circuit and the PCS heat exchange circuit are independent of each other and use independent refrigerants to complete heat energy exchange; The refrigeration mechanism includes a cold end heat energy exchange part and a hot end heat energy exchange part; The battery heat exchange circuit is divided into a battery heat exchange side and a first heat exchange side; the PCS heat exchange circuit is divided into a PCS heat exchange side and a second heat exchange side; The first heat exchange side and the second heat exchange side are respectively attached to the cold end heat energy exchange part of the refrigeration mechanism; Or the first heat exchange side and the second heat exchange side are both attached to the cold end heat energy exchange part and the hot end heat energy exchange part of the refrigeration mechanism; The thermal energy storage circuit includes a liquid storage tank with a built-in refrigerant and a liquid inlet pipe and a liquid outlet pipe connected to the liquid storage tank; the liquid inlet pipe is connected to the first heat exchange side, and the liquid outlet pipe is connected to the battery heat exchange side.

2. The energy storage cabinet thermal energy control system according to claim 1, characterized in that: A heat-insulating layer is provided inside the liquid storage tank; the heat-insulating layer mitigates the influence of the external ambient temperature on the refrigerant inside the liquid storage tank.

3. A method for regulating thermal energy of an energy storage cabinet based on the thermal energy regulation system of an energy storage cabinet according to claim 1, characterized in that: The following steps are involved: S100, setting the ideal operating temperature range of the energy storage battery to a first temperature range, and the ideal operating temperature range of the PCS to a second temperature range; S200: Real-time detection to obtain the ambient temperature of the energy storage cabinet, the temperature of the energy storage battery, the PCS temperature, and the refrigerant temperature in the liquid storage tank; S300: If the detected temperature of the energy storage battery is less than the first temperature range in step S100, the battery heat exchange circuit and the refrigeration mechanism are activated, and the first heat exchange side transfers heat energy to the battery heat exchange side through the hot end heat energy exchange part to heat the energy storage battery; S400: If the detected temperature of the energy storage battery is greater than the first temperature range in step S100, the battery heat exchange circuit and the refrigeration mechanism are activated, and heat energy from the battery heat exchange side is transferred to the first heat exchange side. The first heat exchange side dissipates the heat energy through the cold end heat exchange part to cool the energy storage battery; S500: If the detected PCS temperature value is less than the second temperature range in step S100, the PCS heat exchange circuit and the refrigeration mechanism are started, and the second heat exchange side transfers heat energy to the PCS heat exchange side through the hot end heat energy exchange part to heat the PCS; S600: If the detected PCS temperature value is greater than the second temperature range in step S100, the PCS heat exchange circuit and the refrigeration mechanism are started, and the heat energy on the PCS heat exchange side is transferred to the second heat exchange side. The second heat exchange side dissipates the heat energy through the cold end heat exchange part to cool the PCS.

4. The method for regulating thermal energy of an energy storage cabinet according to claim 3, characterized in that: After the refrigerant temperature value in the liquid storage tank is detected and obtained in step S200; In step S300, if the detected energy storage battery temperature is lower than the first temperature range in step S100 and lower than the refrigerant temperature, the thermal energy storage circuit is activated first. The heat energy in the liquid storage tank flows from the liquid outlet pipe to the battery heat exchange side through the refrigerant to heat the energy storage battery. In step S400, if the detected energy storage battery temperature value is greater than the first temperature range in step S100 and greater than the refrigerant temperature value, the thermal energy storage circuit is activated first, and the refrigerant flows from the liquid outlet pipe to the battery heat exchange side. The heat energy on the battery heat exchange side is transferred to the refrigerant, and the refrigerant flows back to the liquid storage tank to dissipate the heat energy, thereby cooling the energy storage battery.

5. The method for regulating thermal energy of an energy storage cabinet according to claim 4, characterized in that: In step S200; If the detected external ambient temperature value is lower than the lower limit of the first temperature range, during the power off period, the thermal energy storage circuit and the refrigeration mechanism are activated. After the refrigerant flows through the first heat exchange side, it absorbs the heat energy of the hot end heat energy exchange part and flows back to the liquid storage tank, completing the heat energy storage until the refrigerant temperature value in the liquid storage tank reaches the first temperature range; If the detected external ambient temperature value is greater than the upper limit of the first temperature range, the thermal energy storage circuit and the refrigeration mechanism are started during the low power supply period. After the refrigerant flows through the first heat exchange side, the cold end heat energy exchange part absorbs the heat energy of the refrigerant, and the refrigerant flows back to the liquid storage tank, completing the refrigerant cooling until the refrigerant temperature value in the liquid storage tank reaches the first temperature range.

6. The method for regulating thermal energy of an energy storage cabinet according to claim 5, characterized in that: The first temperature range is 20°C to 30°C; the second temperature range is 15°C to 35°C.

Images