Energy storage system and heat dissipation system thereof

Abstract

The invention relates to an energy storage system and a heat dissipation system thereof, the energy storage system comprises an energy storage converter and a battery pack, the heat dissipation system comprises a converter heat exchange device, the water supply end of the converter heat exchange device is connected with a cooling medium, and the water return end of the converter heat exchange device outputs the cooling medium; the water supply end of the battery heat exchange device is connected with a cooling medium, and the water return end outputs the cooling medium; the temperature testing device is used for testing the temperature of the cooling medium output by the water return ends of the converter heat exchange device and the battery heat exchange device to obtain the converter water return temperature and the battery water return temperature; the public heat exchange branch is mechanically connected with the converter heat exchange device and the battery heat exchange device; the converter medium cooling branch is mechanically connected with the converter heat exchange device; the battery medium cooling branch is mechanically connected with the battery heat exchange device; and the control device executes at least one of first control, second control and third control according to the temperature difference between the return water temperature of the converter and the return water temperature of the battery. The LED lamp has the advantages of being good in heat dissipation and energy saving effect and free of hysteresis in temperature control.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to an energy storage system and a heat dissipation system thereof. Background Art

[0002] In the energy storage system, the energy storage battery pack (referred to as the battery pack) and the energy storage inverter (i.e. PCS) that require a temperature control solution are integrated. Usually, the tolerable temperature of the energy storage inverter is higher than that of the battery pack, and the difference in the tolerable temperature of the two is quite large. Therefore, in the related art, two independent heat dissipation systems are generally used to cool the battery pack and the energy storage inverter. For example, the energy storage inverter uses an air-cooled unit, and the battery pack uses a more efficient liquid-cooled unit. This will result in two sets of temperature control units in one container. However, the air cooling efficiency is low, resulting in high energy consumption and poor energy-saving performance of the unit. Moreover, these heat dissipation systems usually use the ambient temperature as a judgment condition to adjust the operation of the air-cooled and liquid-cooled units, so they also have the disadvantages of adjustment hysteresis and indirectness. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an energy storage system and a heat dissipation system thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a heat dissipation system for an energy storage system, the energy storage system includes an energy storage converter and a battery pack, and the heat dissipation system includes:

[0005] A converter heat exchange device, wherein a cooling medium is connected to a water supply end thereof and a cooling medium is outputted from a water return end thereof so as to dissipate heat for the energy storage converter through the cooling medium flowing through the inside thereof;

[0006] A battery heat exchange device, wherein a water supply end of the device is connected to a cooling medium and a water return end of the device outputs the cooling medium, so as to dissipate heat for the battery pack by the cooling medium flowing through the device;

[0007] A temperature testing device, used to test the temperature of the cooling medium output from the return water end of the converter heat exchange device and the battery heat exchange device, and obtain the converter return water temperature and the battery return water temperature;

[0008] A common heat exchange branch, mechanically connected to the converter heat exchange device and the battery heat exchange device;

[0009] A converter medium cooling branch, mechanically connected to the converter heat exchange device;

[0010] a battery medium cooling branch, mechanically connected to the battery heat exchange device; and

[0011] a control device for executing at least one of a first control, a second control and a third control according to a temperature difference between a return water temperature of the converter and a return water temperature of the battery;

[0012] The first control includes: controlling the common heat exchange branch to be connected so that the cooling medium with a temperature difference outputted from the return water ends of the converter heat exchange device and the battery heat exchange device exchanges heat in the common heat exchange branch;

[0013] The second control includes: controlling the inverter medium cooling branch to be connected to cool at least a portion of the cooling medium output from the return water end of the inverter heat exchange device;

[0014] The third control includes: controlling the battery medium cooling branch to be connected, so as to cool at least a portion of the cooling medium outputted from the return water end of the converter heat exchange device.

[0015] Preferably, the heat dissipation system further comprises a first three-way valve and a second three-way valve;

[0016] The first valve port of the first three-way valve is mechanically connected to the return water end of the converter heat exchange device, the second valve port is mechanically connected to the common heat exchange branch, and the third valve port is mechanically connected to the converter medium cooling branch. The first three-way valve is also electrically connected to the control device to control the first valve port and the second valve port of the first three-way valve to be connected when the first control is performed, and to control the first valve port and the third valve port of the first three-way valve to be connected when the second control is performed;

[0017] The first valve port of the second three-way valve is mechanically connected to the return water end of the battery heat exchange device, the second valve port is mechanically connected to the common heat exchange branch, and the third valve port is mechanically connected to the battery medium cooling branch. The second three-way valve is also electrically connected to the control device to control the first valve port and the second valve port of the second three-way valve to be connected when executing the first control, and to control the first valve port and the third valve port of the second three-way valve to be connected when executing the third control.

[0018] Preferably, the converter heat exchange device comprises:

[0019] A converter heat exchanger comprising a first circulation conduit; and

[0020] a first water pump, mechanically connected to the first circulation pipeline and the first valve port of the first three-way valve, so as to provide circulation power for the cooling medium in the first circulation pipeline;

[0021] The battery heat exchange device comprises:

[0022] a battery heat exchanger including a second circulation conduit; and

[0023] The second water pump is mechanically connected to the second circulation pipeline and the first valve port of the second three-way valve to provide circulation power for the cooling medium in the second circulation pipeline.

[0024] Preferably, the common heat exchange branch comprises:

[0025] The first heat exchange device is arranged near the return water end of the converter heat exchange device and the battery heat exchange device, and includes a first channel and a second channel. The water inlet end of the first channel is mechanically connected to the second valve port of the first three-way valve, and the water outlet end is mechanically connected to the water supply end of the converter heat exchange device. The water inlet end of the second channel is mechanically connected to the second valve port of the second three-way valve, and the water outlet end is mechanically connected to the water supply end of the battery heat exchange device, so that the cooling media in the first channel and the second channel can exchange heat with each other when the first control is executed.

[0026] Preferably, the converter medium cooling branch comprises:

[0027] a first radiator, mechanically connected between the third valve port of the first three-way valve and the water supply end of the converter heat exchange device; and

[0028] The first fan cooperates with the first radiator and is also electrically connected to the control device so as to be started when the second control is executed.

[0029] Preferably, the battery medium cooling branch comprises:

[0030] A second heat exchange device, comprising a third channel and a fourth channel, wherein a water inlet end of the first channel is mechanically connected to a third valve port of the second three-way valve, a water outlet end of the third channel is mechanically connected to a water supply end of the battery heat exchange device, an air inlet end of the fourth channel is connected to a low-temperature and high-pressure refrigerant, and an air outlet end of the fourth channel outputs a low-temperature and low-pressure refrigerant obtained after heat exchange between the low-temperature and high-pressure refrigerant and the cooling medium of the third channel;

[0031] A compressor, whose input end is mechanically connected to the gas outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant and output the high-temperature and high-pressure refrigerant through its output end;

[0032] a second radiator, the input end of which is mechanically connected to the output end of the compressor;

[0033] a throttle valve mechanically connected between the output end of the second radiator and the air inlet end of the fourth channel to throttle the low-temperature and high-pressure refrigerant input into the fourth channel; and

[0034] The second fan cooperates with the second radiator and is also electrically connected to the control device so as to be started when the third control is executed.

[0035] Preferably, the control device comprises:

[0036] a calculation unit, configured to calculate a difference between the converter return water temperature and the battery return water temperature to obtain the temperature difference; and

[0037] A control unit, configured to perform a thermal management step according to the temperature difference, comprising:

[0038] Determine the temperature interval where the temperature difference is located according to the temperature interval list; wherein the temperature interval includes a first temperature interval [T1,∞], a second temperature interval [T3,T2], a third temperature interval [0°C,T3], a fourth temperature interval [-∞,T4], a fifth temperature interval [T5,T6] and a sixth temperature interval [T6,0°C], wherein T1>T2>T3>0°C, T4<T5<T6<0°C;

[0039] When the temperature difference is within the first temperature range, performing the first control and the third control, and setting the rotation speed of the compressor to a first set speed;

[0040] When the temperature difference is within the second temperature range, the first control and the third control are executed, and the rotation speed of the compressor is set to a second set speed, which is greater than the first set speed;

[0041] When the temperature difference is within the third temperature range, performing the first control, the second control and the third control, and setting the rotation speed of the compressor to the second set speed;

[0042] When the temperature difference is within the fourth temperature interval, executing the first control;

[0043] When the temperature difference is within the fifth temperature interval, executing the first control and the second control;

[0044] When the temperature difference is within the sixth temperature interval, the first control, the second control, and the third control are performed.

[0045] Preferably, the temperature difference between T1 and T2, T2 and T3, T6 and T5, and T5 and T4 ranges from 5 to 10°C.

[0046] Preferably, the heat dissipation system further comprises: a human-computer interaction device for generating a mode setting signal according to a user operation;

[0047] The control unit is also used to set the working mode to the energy-saving working mode or the normal working mode according to the mode setting signal. When in the energy-saving working mode, the thermal management step is performed according to the temperature difference, and when in the normal working mode, the first control is performed.

[0048] The present invention also constructs an energy storage system, including an energy storage converter, a battery pack and the heat dissipation system described above.

[0049] The technical solution of the present invention is implemented by executing at least one of the first control, the second control and the third control according to the temperature difference of the cooling medium output from the return end of the converter heat exchange device and the battery heat exchange device. The first control can be executed to fully utilize the low-temperature cooling medium for cooling, thereby effectively improving energy saving and reducing the energy consumption of the heat dissipation system. The second control or the third control can also be executed to improve the heat dissipation efficiency of the cooling medium output from the return end of the converter heat exchange device or the battery heat exchange device, thereby ensuring that the heat dissipation performance supplied to the converter heat exchange device and the battery heat exchange device meets the requirements, thereby avoiding overheating and damage to the energy storage converter and the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0051] Figure 1 is a schematic diagram of the structure of a heat dissipation system in some embodiments of the present invention;

[0052] Figure 2 is a circuit block diagram of a control device in some embodiments of the present invention;

[0053] Figure 3 is a flowchart of steps S1 to S7 in some embodiments of the present invention. DETAILED DESCRIPTION

[0054] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0055] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0056] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0057] The embodiment of the present invention provides a heat dissipation system, which is used for an energy storage system, wherein the energy storage system includes a battery pack for storing electric energy and an energy storage converter for converting the current or voltage output by the battery pack between AC and DC. The heat dissipation system can dissipate heat for the energy storage converter and the battery pack, and has the advantages of good heat dissipation and energy saving effects, and no hysteresis in temperature control. Figure 1 As shown, the heat dissipation system may include a converter heat exchange device 10, a battery heat exchange device 20, a temperature testing device 30, a common heat exchange branch 40, a converter medium cooling branch 50, a battery medium cooling branch 60 and a control device (not shown).

[0058] It should be noted that, among the various devices and circuits of the present invention, the lines that need to transport cooling medium or refrigerant are all mechanically connected through pipelines, which will not be described in detail below. In addition, the cooling medium can be a liquid or a gas, preferably a liquid such as water or a coolant.

[0059] See also Figure 1 The water supply end of the converter heat exchange device 10 is connected to the cooling medium, and the return water end of the converter heat exchange device 10 outputs the cooling medium to dissipate heat for the energy storage converter through the cooling medium flowing through the inside thereof.

[0060] In some embodiments, Figure 1 As shown, the converter heat exchange device 10 may include a converter heat exchanger 18 and a first water pump 11 .

[0061] The converter heat exchanger 18 includes a first radiator and a first circulation pipe. The first radiator is provided on the energy storage converter, and the first circulation pipe runs through the first radiator. When a cooling medium with a temperature lower than that of the energy storage converter flows through the first circulation pipe, the cooling medium can exchange heat with the energy storage converter through the first radiator to cool the energy storage converter. It should be noted that the converter heat exchanger 18 can be an existing converter radiator, and the specific structure can refer to the prior art, which will not be described here.

[0062] The first water pump 11 is mechanically connected to the first circulation pipeline, the common heat exchange branch 40 and the converter medium cooling branch 50 to provide circulation power for the cooling medium in the first circulation pipeline. Figure 1 As shown, the input end of the first water pump 11 is mechanically connected to the return end of the first circulation pipeline, and the output end of the first water pump 11 (equivalent to the return end of the converter heat exchange device 10) is mechanically connected to the common heat exchange branch 40 through the first valve port and the second valve port of the first three-way valve 12, and is mechanically connected to the converter medium cooling branch 50 through the first valve port and the third valve port of the first three-way valve 12 in another way, which is equivalent to setting the first water pump 11 on the main road of the first circulation pipeline, so that a single water pump can be used to provide circulation power to all branches mechanically connected to the first circulation pipeline.

[0063] In some embodiments, the first water pump 11 is arranged as close as possible to the return water end of the first circulation pipeline, which can effectively ensure that the common heat exchange branch 40 and the converter medium cooling branch 50 at the rear end of the first water pump 11 generate fewer accumulated bubbles during operation, and ensure that the liquid can more fully exchange heat in the common heat exchange branch 40 and the converter medium cooling branch 50, thereby improving the heat exchange efficiency. In addition, the first water pump 11 can be an existing electric pump. If the first water pump 11 is an electric pump with built-in protection functions, such as leakage detection and liquid shortage detection, then the control device can also output an alarm signal based on the leakage and liquid shortage detection results, so that the user can know the abnormality in advance and deal with it as soon as possible, that is, the protection function of the first water pump 11 can be used to provide a certain degree of protection for the energy storage converter, which can play a role similar to a buffer water tank.

[0064] See also Figure 1 The water supply end of the battery heat exchange device 20 is connected to the cooling medium, and the return water end of the battery heat exchange device 20 outputs the cooling medium to dissipate heat for the battery pack through the cooling medium flowing through the inside thereof.

[0065] In some embodiments, the battery heat exchange device 20 may include a battery heat exchanger 28 and a second water pump 21 .

[0066] The battery heat exchanger 28 includes a second radiator and a second circulation pipe. The second radiator is provided on the battery pack, and the second circulation pipe runs through the second radiator. When the cooling medium with a temperature lower than that of the battery pack flows through the second circulation pipe, the cooling medium can exchange heat with the battery pack through the second radiator to cool the battery pack. It should be noted that the battery heat exchanger 28 can be an existing battery radiator. The specific structure can refer to the existing technology and will not be repeated here.

[0067] The second water pump 21 is mechanically connected to the second circulation pipeline, the common heat exchange branch 40 and the battery medium cooling branch 60 to provide circulation power for the cooling medium in the second circulation pipeline. Figure 1 As shown, the input end of the second water pump 21 is mechanically connected to the return end of the second circulation pipeline, and the output end of the second water pump 21 (equivalent to the return end of the battery heat exchange device 20) is mechanically connected to the common heat exchange branch 40 through the first valve port and the second valve port of the second three-way valve 22, and is mechanically connected to the battery medium cooling branch 60 through the first valve port and the third valve port of the second three-way valve 22. This is equivalent to setting the second water pump 21 on the main road of the second circulation pipeline, so that a single water pump can be used to provide circulation power to all branches mechanically connected to the second circulation pipeline.

[0068] In some embodiments, the second water pump 21 is arranged as close as possible to the return end of the first circulation pipeline, which can effectively ensure that the common heat exchange branch 40 and the battery medium cooling branch 60 at the rear end of the second water pump 21 generate fewer accumulated bubbles during operation, and ensure that the liquid can more fully exchange heat in the common heat exchange branch 40 and the battery medium cooling branch 60, thereby improving the heat exchange efficiency. In addition, the second water pump 21 can be an existing electric pump. If the second water pump 21 is an electric pump with built-in protection functions, such as leakage detection and liquid shortage detection, then the control device can also output an alarm signal based on the leakage and liquid shortage detection results, so that the user can know the abnormality in advance and deal with it as soon as possible, that is, the protection function of the second water pump 21 can be used to provide a certain degree of protection for the energy storage inverter, which can play a role similar to a buffer water tank.

[0069] See also Figure 1 The temperature testing device 30 is connected to the return water end of the converter heat exchange device 10 and the return water end of the battery heat exchange device 20, and is electrically connected to the control device. The temperature testing device 30 is used to test the temperature of the cooling medium output by the return water end of the converter heat exchange device 10 and the battery heat exchange device 20, and input the converter return water temperature that can characterize the temperature of the cooling medium output by the return water end of the converter heat exchange device 10 and the converter return water temperature and the battery return water temperature that can characterize the temperature of the cooling medium output by the return water end of the battery heat exchange device 20 to the control device.

[0070] In some embodiments, Figure 1 As shown, the temperature testing device 30 may include a first thermometer 111 connected to the return water end of the converter heat exchange device 10 and a second thermometer 211 connected to the return water end of the battery heat exchange device 20, wherein the first thermometer 111 and the second thermometer 211 may be existing temperature testers or temperature sensors.

[0071] See also Figure 1 The common heat exchange branch 40 is mechanically connected to the converter heat exchange device 10 and the battery heat exchange device 20. When there is a temperature difference between the cooling media output from the return water ends of the converter heat exchange device 10 and the battery heat exchange device 20, the media output from the two can be heat exchanged, thereby maximizing the use of the temperature difference of the cooling media output from the converter heat exchange device 10 and the battery heat exchange device 20 to achieve heat dissipation, which helps to improve economy.

[0072] exist Figure 1In the illustrated embodiment, the common heat exchange branch 40 may include a first heat exchange device 15, the first heat exchange device 15 includes a first channel and a second channel that are not interconnected, the water inlet end of the first channel is mechanically connected to the second valve port of the first three-way valve 12, and the water outlet end is mechanically connected to the water supply end of the converter heat exchange device 10, the water inlet end of the second channel is mechanically connected to the second valve port of the second three-way valve 22, and the water outlet end is mechanically connected to the water supply end of the battery heat exchange device 20, so that the cooling medium in the first channel and the second channel can exchange heat with each other when the first control is executed. The first heat exchange device 15 may be an existing heat exchange device.

[0073] In some embodiments, the first heat exchange device 15 is arranged as close as possible to the return water ends of the inverter heat exchange device 10 and the battery heat exchange device 20. In this way, the high temperature of the cooling medium at the return water ends of the inverter heat exchange device 10 and the battery heat exchange device 20 can be fully utilized, and the condensation water problem caused by the low temperature of the pipeline can be avoided to a greater extent. It can also reduce the amount of thermal insulation cotton used in the pipeline layout to a certain extent, which has a positive effect on improving user experience and reducing costs.

[0074] In other embodiments, the common heat exchange branch 40 may include a first valve, a second valve and a first heat exchange device 15. The first heat exchange device 15 includes a first channel and a second channel that are not connected to each other. The water inlet end of the first channel is mechanically connected to the return water end of the converter heat exchange device 10 (i.e., the output end of the first water pump 11) through the first valve, and the water outlet end is mechanically connected to the water supply end of the converter heat exchange device 10. The water inlet end of the second channel is mechanically connected to the return water end of the battery heat exchange device 20 through the second valve, and the water outlet end is mechanically connected to the water supply end of the battery heat exchange device 20. The first valve and the second valve are also electrically connected to the control device to connect the first valve and the second valve when executing the first control, so that the cooling medium in the first channel and the second channel can exchange heat with each other. Among them, the first heat exchange device 15 can be an existing heat exchange device, and the first valve and the second valve can be existing electric valves. It should be noted that this embodiment is different from Figure 1 The difference between the illustrated embodiment is that the connection and disconnection between the first channel and the second channel and the return water end of the converter heat exchange device 10 can be achieved without relying on the first three-way valve 12 and the second three-way valve 22, and because the opening of the first valve and the second valve can be independently controlled, this embodiment helps to improve the flow control accuracy of the cooling medium input into the first channel and the second channel.

[0075] See also Figure 1 The converter medium cooling branch 50 is mechanically connected to the converter heat exchange device 10, and can quickly cool at least a portion of the cooling medium output from the return water end of the converter heat exchange device 10 when executing the second control, so as to improve the heat dissipation efficiency.

[0076] exist Figure 1In the illustrated embodiment, the converter medium cooling branch 50 may include a first radiator 16 and a first fan 117. The first radiator 16 is mechanically connected between the third valve port of the first three-way valve 12 and the water supply end of the converter heat exchange device 10. The first fan 117 cooperates with the first radiator 16 and is also electrically connected to the control device to start when the second control is executed. The first radiator 16 may be an existing radiator, and the first fan 117 may be an existing fan or blower.

[0077] In other embodiments, the converter medium cooling branch 50 may include a third valve, a first radiator 16 and a first fan 117. The third valve is electrically connected to the control device so as to connect the third valve when the second control is executed. One end of the first radiator 16 is mechanically connected to the return water end of the converter heat exchange device 10 via the third valve, and the other end is mechanically connected to the water supply end of the converter heat exchange device 10. The first fan 117 cooperates with the first radiator 16 and is also electrically connected to the control device so as to start when the second control is executed. Among them, the third valve can be an existing electric valve. It should be noted that this embodiment is different from Figure 1 The difference between the illustrated embodiments is that the on-off connection between the converter medium cooling branch 50 and the return water end of the converter heat exchange device 10 can be achieved without relying on the first three-way valve 12 and the second three-way valve 22. Since the opening of the third valve can be independently controlled, this embodiment helps to improve the flow control accuracy of the cooling medium input to the first radiator 16.

[0078] See also Figure 1 The battery medium cooling branch 60 is mechanically connected to the battery heat exchange device 20, and can quickly cool at least a portion of the cooling medium output from the return water end of the battery heat exchange device 20 when executing the third control, so as to improve the heat dissipation efficiency.

[0079] exist Figure 1In the illustrated embodiment, the battery medium cooling branch 60 may include a second heat exchange device 25, a compressor 31, a second radiator 32, a throttle valve 33, and a second fan 317. The second heat exchange device 25 includes a third channel and a fourth channel that are not connected to each other. The water inlet end of the first channel is mechanically connected to the third valve port of the second three-way valve 22, the water outlet end of the third channel is mechanically connected to the water supply end of the battery heat exchange device 20, the air inlet end of the fourth channel is connected to the low-temperature and high-pressure refrigerant, and the air outlet end of the fourth channel outputs the low-temperature and low-pressure refrigerant obtained after the low-temperature and high-pressure refrigerant exchanges heat with the cooling medium of the third channel. The input end of the compressor 31 is mechanically connected to the air outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant, and output the high-temperature and high-pressure refrigerant through its output end. The input end of the second radiator 32 is mechanically connected to the output end of the compressor 31. The throttle valve 33 is mechanically connected between the output end of the second radiator 32 and the air inlet end of the fourth channel to throttle the low-temperature and high-pressure refrigerant input to the fourth channel to avoid damaging the fourth channel due to excessive flow. The second fan 317 cooperates with the second radiator 32 and is also electrically connected to the control device so as to be started when the third control is executed.

[0080] In other embodiments, the battery medium cooling branch 60 may include a fourth valve, a second heat exchange device 25, a compressor 31, a second radiator 32, a throttle valve 33 and a second fan 317. The fourth valve is electrically connected to the control device to connect the fourth valve when the third control is executed. The second heat exchange device 25 includes a third channel and a fourth channel that are not connected to each other. The water inlet end of the first channel is mechanically connected to the return water end of the battery heat exchange device 20 through the fourth valve, the water outlet end of the third channel is mechanically connected to the water supply end of the battery heat exchange device 20, the air inlet end of the fourth channel is connected to the low-temperature and high-pressure refrigerant, and the air outlet end of the fourth channel outputs the low-temperature and low-pressure refrigerant obtained after the low-temperature and high-pressure refrigerant exchanges heat with the cooling medium of the third channel. The input end of the compressor 31 is mechanically connected to the air outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant and output the high-temperature and high-pressure refrigerant through its output end. The input end of the second radiator 32 is mechanically connected to the output end of the compressor 31. The throttle valve 33 is mechanically connected between the output end of the second radiator 32 and the air inlet end of the fourth channel to throttle the low-temperature high-pressure refrigerant input to the fourth channel to prevent the fourth channel from being damaged by too much flow. The second fan 317 cooperates with the second radiator 32 and is also electrically connected to the control device to start when the third control is executed. Among them, the fourth valve can be an existing electric valve. It should be noted that this embodiment is different from Figure 1 The difference between the illustrated embodiments is that the on-off connection between the battery medium cooling branch 60 and the return water end of the battery heat exchange device 20 can be achieved without relying on the first three-way valve 12 and the second three-way valve 22. Since the opening of the fourth valve can be independently controlled, this embodiment helps to improve the flow control accuracy of the cooling medium input to the second heat exchange device 25.

[0081] In order to improve the heat dissipation effect of the second radiator 32 , in some embodiments, the refrigerant may be an existing gaseous refrigerant.

[0082] The control device is electrically connected to the converter heat exchange device 10, the battery heat exchange device 20, the temperature testing device 30, the common heat exchange branch 40, the converter medium cooling branch 50 and the battery medium cooling branch 60, and the control device is used to perform at least one of the first control, the second control and the third control according to the temperature difference between the converter return water temperature and the battery return water temperature.

[0083] Among them, the first control includes: controlling the common heat exchange branch 40 to be connected, so that the cooling medium with a temperature difference output by the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 can exchange heat in the common heat exchange branch 40. Specifically, when the control device executes the first control, it will control the common heat exchange branch 40 to be connected with the return water end of the converter heat exchange device 10 and the return water end of the battery heat exchange device 20, respectively, so that the cooling medium with a temperature difference output by the battery heat exchange device 20 and the return water end of the battery heat exchange device 20 can exchange heat inside the common heat exchange branch 40, so that the high-temperature cooling medium can exchange heat with the low-temperature cooling medium. It can be understood that the cooling process of the first control does not need to start equipment such as compressors and radiators, and mainly uses low-temperature cooling medium for cooling. Therefore, executing the first control can achieve energy-saving effects.

[0084] The second control includes: controlling the inverter medium cooling branch 50 to be connected, so as to cool at least a portion of the cooling medium output from the return water end of the inverter heat exchange device 10. Specifically, when the control device executes the second control, it controls the inverter medium cooling branch 50 to be connected with the return water end of the inverter heat exchange device 10, and controls the inverter medium cooling branch 50 to work, so that at least a portion of the cooling medium output from the return water end of the inverter heat exchange device 10 is input into the inverter medium cooling branch 50, and then the inverter medium cooling branch 50 is used to cool this portion of the cooling medium (such as air cooling, liquid cooling, etc.). Since the inverter medium cooling branch 50 has a higher cooling efficiency for the cooling medium than the common heat exchange branch 40, the temperature of this portion of the cooling medium will drop faster, thereby improving the cooling performance of the inverter heat exchange device 10. It can be understood that when the first control and the second control are executed simultaneously, since the cooling medium output by both the inverter heat exchange device 10 and the battery heat exchange device 20 will exchange heat in the common heat exchange branch 40, when the temperature of the cooling medium output from the return water end of the inverter heat exchange device 10 drops rapidly, the heat exchange efficiency of the common heat exchange branch 40 will also be improved.

[0085] The third control includes: controlling the battery medium cooling branch 60 to be connected, so as to cool at least a portion of the cooling medium output from the return water end of the converter heat exchange device 10. Specifically, when the control device executes the second control, it will control the battery medium cooling branch 60 to be connected with the return water end of the battery heat exchange device 20, and control the battery medium cooling branch 60 to work, so that at least a portion of the cooling medium output from the return water end of the battery heat exchange device 20 is input into the battery medium cooling branch 60, and this portion of the cooling medium is cooled (such as air cooling, liquid cooling, etc.). Since the cooling efficiency of the battery medium cooling branch 60 for the cooling medium is higher than that of the converter medium cooling branch 50, the temperature of this portion of the cooling medium will drop significantly, thereby significantly improving the cooling performance of the battery heat exchange device 20. It can be understood that when the first control and the third control are executed simultaneously, since the cooling medium output by both the inverter heat exchange device 10 and the battery heat exchange device 20 will exchange heat in the common heat exchange branch 40, when the temperature of the cooling medium output from the return water end of the battery heat exchange device 20 drops rapidly, the heat exchange efficiency of the common heat exchange branch 40 will also be improved.

[0086] In some embodiments, Figure 2 As shown, the control device may include a calculation unit 71 and a control unit 72. The calculation unit 71 is electrically connected to the first thermometer 111 and the second thermometer 211 to obtain the inverter return water temperature and the battery return water temperature, calculate the difference between the inverter return water temperature and the battery return water temperature, and output a temperature difference that can characterize the difference between the inverter return water temperature and the battery return water temperature. The calculation unit 71 may be a subtractor.

[0087] See also Figure 2 The control unit 72 is electrically connected to the calculation unit 71, the converter heat exchange device 10, the battery heat exchange device 20, the common heat exchange branch 40, the converter medium cooling branch 50 and the battery medium cooling branch 60, and the control unit 72 is used to perform thermal management steps according to the temperature difference.

[0088] Specifically, Figure 3 As shown, the thermal management step may include step S1, step S2, step S3, step S4, step S5, step S6 and step S7.

[0089] Step S1 includes: determining the temperature interval where the temperature difference is located according to the temperature interval list; wherein the temperature interval includes a first temperature interval [T1,∞], a second temperature interval [T3,T2], a third temperature interval [0℃,T3], a fourth temperature interval [-∞,T4], a fifth temperature interval [T5,T6] and a sixth temperature interval [T6,0℃], wherein T1>T2>T3>0℃, T4<T5<T6<0℃.

[0090] Step S2 includes: when the temperature difference is within the first temperature range, executing the first control and the third control, and setting the speed of the compressor 31 to the first set speed. In this step, when the temperature difference is within the first temperature range (i.e., the temperature difference is greater than or equal to the temperature T1), the control unit 72 executes the first control and the third control. Since the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is large enough, the low-temperature cooling medium has a high efficiency in taking away the heat of the cooling medium with a higher temperature (i.e., the heat exchange effect of the common heat exchange branch 40 is high), the control unit 72 sets the speed of the compressor 31 to the first set speed (less than the maximum speed of the compressor 31) when executing the third control, so that the low-temperature cooling medium can be fully utilized to cool the high-temperature cooling medium, and the speed of the compressor 31 can be reduced, which can reduce the power consumption of the heat dissipation system.

[0091] Step S3 includes: when the temperature difference is within the second temperature range, executing the first control and the third control, and setting the rotation speed of the compressor 31 to a second set speed, which is greater than the first set speed. In this step, when the temperature difference is within the second temperature range (i.e., the temperature difference is between temperature T3 and temperature T2), the control unit 72 executes the first control and the third control. Since the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is relatively small, the heat efficiency of the low-temperature cooling medium taking away the cooling medium with a higher temperature is reduced (i.e., the heat exchange effect of the common heat exchange branch 40 is low). Therefore, when executing the third control, the control unit 72 also sets the speed of the compressor 31 to the second set speed (which can be the maximum speed of the compressor 31), thereby improving the cooling efficiency of the battery medium cooling branch 60, and rapidly reducing the temperature of the cooling medium output from the return water end of the battery heat exchange device 20. When the temperature of the cooling medium output from the return water end of the battery heat exchange device 20 is reduced, the temperature difference will increase again, so that the heat exchange efficiency of the common heat exchange branch 40 will increase again, so that the temperature of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 can be rapidly reduced.

[0092] Step S4 includes: when the temperature difference is within the third temperature range, executing the first control, the second control and the third control, and setting the speed of the compressor 31 to the second set speed. In this step, when the temperature difference is within the third temperature range (i.e., the temperature difference is between 0°C and temperature T3), it means that the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is very small, and the control unit 72 will execute the first control, the second control and the third control, and at the same time set the speed of the compressor 31 to the second set speed (which can be the maximum speed of the compressor 31), improve the cooling efficiency of the battery medium cooling branch 60, and at the same time, the execution of the second control will also make the converter medium cooling branch 50 participate in the cooling work, so that the temperature of the cooling medium output from the return water end of the converter heat exchange device 10 is reduced, so that the temperature of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 can be significantly reduced.

[0093] In order to further improve the cooling efficiency, the step S4 may also include: the control unit 72 also controls the opening between the first valve port and the second valve port, and the first valve port and the third valve port of the second three-way valve 22 according to the temperature difference between the inverter return water temperature and the battery return water temperature, wherein the greater the temperature difference, the greater the opening between the first valve port and the second valve of the second three-way valve 22, and the smaller the opening between the first valve port and the third valve of the second three-way valve 22.

[0094] Step S5 includes: when the temperature difference is within the fourth temperature interval, executing the first control. In this step, when the temperature difference (negative number) is within the fourth temperature interval (i.e., the temperature difference is less than or equal to temperature T4), the control unit 72 executes the first control and the third control. Since the absolute value of the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is large enough, the speed of the compressor 31 can be set to the first set speed, so that the low-temperature cooling medium can be fully utilized to cool the high-temperature cooling medium, which helps to reduce the power consumption of the heat dissipation system.

[0095] Step S6 includes: when the temperature difference is within a fifth temperature interval, executing the first control and the second control.

[0096] In this step, when the temperature difference is within the fifth temperature range (i.e., the temperature difference is between temperature T5 and temperature T6), the control unit 72 executes the first control and the third control. Since the absolute value of the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is relatively small, the heat exchange effect of the common heat exchange branch 40 is low. Therefore, when executing the third control, the control unit 72 also sets the speed of the compressor 31 to the second set speed to improve the cooling efficiency of the battery medium cooling branch 60, so that the temperature of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 drops rapidly.

[0097] Step S7 includes: when the temperature difference is within a sixth temperature interval, executing the first control, the second control and the third control.

[0098] In this step, when the temperature difference is within the third temperature range (i.e., the temperature difference is between temperature T6 and 0°C), it indicates that the absolute value of the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 is very small. The control unit 72 will execute the first control, the second control and the third control, and at the same time set the speed of the compressor 31 to the second set speed (which can be the maximum speed of the compressor 31), thereby improving the cooling efficiency of the battery medium cooling branch 60. At the same time, the execution of the second control will also cause the converter medium cooling branch 50 to participate in the cooling work, thereby reducing the temperature of the cooling medium output from the return water end of the converter heat exchange device 10. In this way, the temperature of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20 can be significantly reduced.

[0099] In order to further improve the cooling efficiency, the step S7 may also include: the control unit 72 also controls the opening between the first valve port and the second valve port, and the first valve port and the third valve port of the second three-way valve 22 according to the temperature difference between the inverter return water temperature and the battery return water temperature, wherein the closer the absolute value of the temperature difference is to 0°C, the larger the opening between the first valve port and the second valve of the second three-way valve 22, and the smaller the opening between the first valve port and the third valve of the second three-way valve 22.

[0100] In some embodiments, the temperature difference between T1 and T2 ranges from 5 to 10°C, the temperature difference between T2 and T3 ranges from 5 to 10°C, the temperature difference between T6 and T5 ranges from 5 to 10°C, and the temperature difference between T5 and T4 ranges from 5 to 10°C.

[0101] In some embodiments, Figure 2 As shown, the heat dissipation system may further include a human-machine interaction device, which is electrically connected to the control unit 72 to generate a mode setting signal according to a user operation. Accordingly, the control unit 72 is also used to set the working mode to an energy-saving working mode or a normal working mode according to the mode setting signal, and when in the energy-saving working mode, the thermal management step is performed according to the temperature difference, and when in the normal working mode, the first control is performed.

[0102] The technical solution of the present invention is implemented, and at least one of the first control, the second control and the third control is performed according to the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20. The first control can be performed to fully utilize the low-temperature cooling medium for cooling, which effectively improves energy saving and reduces the energy consumption of the heat dissipation system. The second control or the third control can also be performed to improve the heat dissipation efficiency of the cooling medium output from the return water end of the converter heat exchange device 10 or the battery heat exchange device 20, ensuring that the heat dissipation performance supplied to the converter heat exchange device 10 and the battery heat exchange device 20 meets the requirements, so as to avoid overheating damage to the energy storage converter and the battery pack. In addition, since the temperature difference calculation of the present invention is obtained by directly collecting the temperature difference of the cooling medium output from the return water end of the converter heat exchange device 10 and the battery heat exchange device 20, it is equivalent to directly using the change in the cooling medium temperature to participate in the control of the common heat exchange branch 40, the converter medium cooling branch 50 and the battery medium cooling branch 60, so it has the advantages of fast control response and no hysteresis in temperature control.

[0103] The present invention also provides an air conditioning device, including an energy storage system and a heat dissipation system provided by an embodiment of the present invention; wherein the energy storage system includes an energy storage inverter and a battery pack.

[0104] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0105] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0106] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0107] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A heat dissipation system for an energy storage system, wherein the energy storage system comprises an energy storage converter and a battery pack, characterized in that: The heat dissipation system comprises: A converter heat exchange device (10), wherein a cooling medium is connected to a water supply end thereof and a cooling medium is outputted from a water return end thereof so as to dissipate heat for the energy storage converter through the cooling medium flowing through the inside thereof; A battery heat exchange device (20), wherein a water supply end thereof is connected to a cooling medium and a water return end thereof outputs the cooling medium so as to dissipate heat for the battery pack through the cooling medium flowing through the inside thereof; A temperature testing device (30) is used to test the temperature of the cooling medium outputted from the return water ends of the converter heat exchange device (10) and the battery heat exchange device (20), and obtain the converter return water temperature and the battery return water temperature; A common heat exchange branch (40) mechanically connected to the converter heat exchange device (10) and the battery heat exchange device (20); A converter medium cooling branch (50) mechanically connected to the converter heat exchange device (10); A battery medium cooling branch (60) mechanically connected to the battery heat exchange device (20); and a control device for executing at least one of a first control, a second control and a third control according to a temperature difference between a return water temperature of the converter and a return water temperature of the battery; The first control comprises: controlling the common heat exchange branch (40) to be connected, so that the cooling medium with a temperature difference outputted from the return water ends of the converter heat exchange device (10) and the battery heat exchange device (20) is heat exchanged in the common heat exchange branch (40); The second control comprises: controlling the inverter medium cooling branch (50) to be connected so as to cool at least a portion of the cooling medium outputted from the return water end of the inverter heat exchange device (10); The third control includes: controlling the battery medium cooling branch (60) to be connected so as to cool at least a portion of the cooling medium output from the return water end of the converter heat exchange device (10).

2. The heat dissipation system according to claim 1, characterized in that: The heat dissipation system further comprises a first three-way valve (12) and a second three-way valve (22); The first valve port of the first three-way valve (12) is mechanically connected to the return water end of the converter heat exchange device (10), the second valve port is mechanically connected to the common heat exchange branch (40), and the third valve port is mechanically connected to the converter medium cooling branch (50); the first three-way valve (12) is also electrically connected to the control device, so as to control the first valve port and the second valve port of the first three-way valve (12) to be connected when the first control is executed, and control the first valve port and the third valve port of the first three-way valve (12) to be connected when the second control is executed; The first valve port of the second three-way valve (22) is mechanically connected to the return water end of the battery heat exchange device (20), the second valve port is mechanically connected to the common heat exchange branch (40), and the third valve port is mechanically connected to the battery medium cooling branch (60). The second three-way valve (22) is also electrically connected to the control device to control the first valve port and the second valve port of the second three-way valve (22) to be connected when the first control is executed, and to control the first valve port and the third valve port of the second three-way valve (22) to be connected when the third control is executed.

3. The heat dissipation system according to claim 2, characterized in that: The converter heat exchange device (10) comprises: A converter heat exchanger (18) comprising a first circulation conduit; and A first water pump (11) is mechanically connected to the first circulation pipeline and the first valve port of the first three-way valve (12) to provide circulation power for the cooling medium in the first circulation pipeline; The battery heat exchange device (20) comprises: a battery heat exchanger (28) comprising a second circulation conduit; and The second water pump (21) is mechanically connected to the second circulation pipeline and the first valve port of the second three-way valve (22) to provide circulation power for the cooling medium in the second circulation pipeline.

4. The heat dissipation system according to claim 2, characterized in that: The common heat exchange branch (40) comprises: The first heat exchange device (15) is arranged near the return water ends of the converter heat exchange device (10) and the battery heat exchange device (20), and comprises a first channel and a second channel, wherein the water inlet end of the first channel is mechanically connected to the second valve port of the first three-way valve (12), and the water outlet end is mechanically connected to the water supply end of the converter heat exchange device (10), and the water inlet end of the second channel is mechanically connected to the second valve port of the second three-way valve (22), and the water outlet end is mechanically connected to the water supply end of the battery heat exchange device (20), so that the cooling media in the first channel and the second channel can exchange heat with each other when the first control is executed.

5. The heat dissipation system according to claim 2, characterized in that: The converter medium cooling branch (50) comprises: A first radiator (16) mechanically connected between the third valve port of the first three-way valve (12) and a water supply end of the converter heat exchange device (10); as well as The first fan (117) cooperates with the first radiator (16) and is also electrically connected to the control device so as to be started when the second control is executed.

6. The heat dissipation system according to any one of claims 2 to 5, characterized in that: The battery medium cooling branch (60) comprises: A second heat exchange device (25), comprising a third channel and a fourth channel, wherein a water inlet end of the first channel is mechanically connected to a third valve port of the second three-way valve (22), a water outlet end of the third channel is mechanically connected to a water supply end of the battery heat exchange device (20), an air inlet end of the fourth channel is connected to a low-temperature and high-pressure refrigerant, and an air outlet end of the fourth channel outputs a low-temperature and low-pressure refrigerant obtained after heat exchange between the low-temperature and high-pressure refrigerant and the cooling medium of the third channel; A compressor (31), whose input end is mechanically connected to the gas outlet end of the fourth channel, so as to compress the low-temperature and low-pressure refrigerant and output the high-temperature and high-pressure refrigerant through its output end; A second radiator (32), an input end of which is mechanically connected to an output end of the compressor (31); a throttle valve (33) mechanically connected between the output end of the second radiator (32) and the air inlet end of the fourth channel to throttle the low-temperature and high-pressure refrigerant input into the fourth channel; as well as The second fan (317) cooperates with the second radiator (32) and is also electrically connected to the control device so as to be started when the third control is executed.

7. The heat dissipation system according to claim 6, characterized in that: The control device comprises: a calculation unit, configured to calculate a difference between the converter return water temperature and the battery return water temperature to obtain the temperature difference; and A control unit, configured to perform a thermal management step according to the temperature difference, comprising: Determine the temperature interval where the temperature difference is located according to the temperature interval list; wherein the temperature interval includes a first temperature interval [T1,∞], a second temperature interval [T3,T2], a third temperature interval [0°C,T3], a fourth temperature interval [-∞,T4], a fifth temperature interval [T5,T6] and a sixth temperature interval [T6,0°C], wherein T1>T2>T3>0°C, T4<T5<T6<0°C; When the temperature difference is within the first temperature range, the first control and the third control are executed, and the rotation speed of the compressor (31) is set to a first set speed; When the temperature difference is within the second temperature range, the first control and the third control are executed, and the rotation speed of the compressor (31) is set to a second set speed, wherein the second set speed is greater than the first set speed; When the temperature difference is within the third temperature range, the first control, the second control and the third control are executed, and the rotation speed of the compressor (31) is set to the second set speed; When the temperature difference is within the fourth temperature interval, executing the first control; When the temperature difference is within the fifth temperature interval, executing the first control and the second control; When the temperature difference is within the sixth temperature interval, the first control, the second control, and the third control are performed.

8. The heat dissipation system according to claim 7, characterized in that: The temperature difference between T1 and T2, T2 and T3, T6 and T5, and T5 and T4 ranges from 5 to 10°C.

9. The heat dissipation system according to claim 7, characterized in that: The heat dissipation system further comprises: a human-computer interaction device for generating a mode setting signal according to a user operation; The control unit is also used to set the working mode to the energy-saving working mode or the normal working mode according to the mode setting signal. When in the energy-saving working mode, the thermal management step is performed according to the temperature difference, and when in the normal working mode, the first control is performed.

10. An energy storage system, characterized in that: It comprises an energy storage converter, a battery pack and a heat dissipation system as claimed in any one of claims 1 to 9.

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