Energy storage system and heat dissipation system thereof

Abstract

The present application relates to an energy storage system and a heat dissipation system thereof, the energy storage system comprising an energy storage converter and a battery pack, the heat dissipation system comprising: a converter heat exchange device, a water supply end of which is connected to a cooling medium, and a water return end of which outputs the cooling medium; a battery heat exchange device, a water supply end of which is connected to the cooling medium, and a water return end of which outputs the cooling medium; a temperature testing device for testing the temperature of the cooling medium output by the water return end of the converter heat exchange device and the battery heat exchange device, obtaining a converter water return temperature and a battery water return temperature; a common heat exchange branch mechanically connected to the converter heat exchange device and the battery heat exchange device; a converter medium cooling branch mechanically connected to the converter heat exchange device; a battery medium cooling branch mechanically connected to the battery heat exchange device; and a control device, which performs at least one of a first control, a second control and a third control according to the temperature difference between the converter water return temperature and the battery water return temperature. The present application has the advantages of good heat dissipation and energy saving effect and no temperature control hysteresis.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and more particularly to energy storage systems and their heat dissipation systems. Background Technology

[0002] Energy storage systems integrate energy storage battery packs (referred to as battery packs) and energy storage converters (i.e., PCS) that require temperature control solutions. Typically, the temperature tolerance of the energy storage converter is higher than that of the battery pack, and the difference in their temperature tolerances is significant. Therefore, in related technologies, two independent cooling systems are generally used for cooling the battery pack and the energy storage converter. For example, the energy storage converter uses an air-cooled unit, while the battery pack uses a more efficient liquid-cooled unit. This results in two temperature control units being used within a single container. However, air cooling is less efficient, leading to high energy consumption and poor energy-saving performance. Moreover, these cooling systems usually use ambient temperature as a criterion to adjust the operation of the air-cooled and liquid-cooled units, thus exhibiting the disadvantages of lag and indirect adjustment. Summary of the Invention

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

[0004] The technical solution adopted by this invention to solve its technical problem is: to construct a heat dissipation system for an energy storage system, wherein 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 has a water supply end connected to a cooling medium and a return end outputting a cooling medium to dissipate heat from the energy storage converter through the cooling medium flowing through its interior.

[0006] A battery heat exchange device has a water supply end connected to a cooling medium and a water return end outputting a cooling medium to dissipate heat from the battery pack through the cooling medium flowing through its interior.

[0007] A temperature testing device is 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, so as to obtain the converter return water temperature and the battery return water temperature.

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

[0009] The converter medium cooling branch is mechanically connected to the converter heat exchange device;

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

[0011] The control device performs at least one of the first control, the second control, and the third control based on the temperature difference between the return water temperature of the inverter and the return water temperature of the battery.

[0012] The first control comprises: controlling the communication of the common heat exchange branch, so that the cooling medium with temperature difference output by the return water end of the inverter heat exchange device and the battery heat exchange device exchanges heat in the common heat exchange branch;

[0013] The second control comprises: controlling the communication of the inverter medium cooling branch, so that at least part of the cooling medium output by the return water end of the inverter heat exchange device is cooled;

[0014] The third control comprises: controlling the communication of the battery medium cooling branch, so that at least part of the cooling medium output by the return water end of the battery heat exchange device is cooled.

[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 inverter 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 inverter 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 the first control is performed, and to control the first valve port and the third valve port of the second three-way valve to be connected when the third control is performed.

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

[0019] an inverter heat exchanger comprising a first circulating pipeline; and

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

[0021] The battery heat exchange device comprises:

[0022] a battery heat exchanger comprising a second circulating pipeline; and

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

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

[0025] a first heat exchange device, which is arranged close to the water outlet end of the inverter heat exchange device and the battery heat exchange device, and comprises 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 inverter 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 medium in the first channel and the second channel can exchange heat with each other when the first control is executed.

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

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

[0028] a first fan, which cooperates with the first radiator and is also electrically connected to the control device to be started when the second control is executed.

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

[0030] a second heat exchange device, which comprises a third channel and a fourth channel, the water inlet end of the first channel is mechanically connected to the third valve port of the second three-way valve, the water outlet end of the third channel is mechanically connected to the water supply end of the battery heat exchange device, the gas inlet end of the fourth channel is connected to low-temperature and high-pressure refrigerant, and the gas outlet end of the fourth channel outputs low-temperature and low-pressure refrigerant obtained by exchanging heat between the low-temperature and high-pressure refrigerant and the cooling medium of the third channel;

[0031] a compressor, the input end of which is mechanically connected to the gas outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant, and the output end of which outputs high-temperature and high-pressure refrigerant;

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

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

[0034] a second fan, which cooperates with the second radiator and is also electrically connected to the control device 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 inverter return water temperature and the battery return water temperature to obtain a temperature difference; and

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

[0038] determining a temperature interval in which the temperature difference is located according to a 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℃;

[0039] when the temperature difference is in the first temperature interval, 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 in the second temperature interval, performing the first control and the third control, and setting the rotation speed of the compressor to a second set speed, the second set speed being greater than the first set speed;

[0041] when the temperature difference is in the third temperature interval, 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 in the fourth temperature interval, performing the first control;

[0043] when the temperature difference is in the fifth temperature interval, performing the first control and the second control;

[0044] when the temperature difference is in the sixth temperature interval, performing the first control, the second control, and the third control.

[0045] Preferably, the temperature difference ranges of T1 and T2, T2 and T3, T6 and T5, and T5 and T4 are 5 to 10℃.

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

[0047] the control unit is further configured to set a working mode to an energy-saving working mode or a regular working mode according to the mode setting signal, wherein the thermal management step is performed according to the temperature difference only when the energy-saving working mode is set, and the first control is performed when the regular working mode is set.

[0048] The application also discloses an energy storage system comprising the energy storage converter, the battery pack and the heat dissipation system.

[0049] The energy storage system of the application can utilize the low-temperature cooling medium to perform the first control, thereby effectively improving the energy saving performance and reducing the energy consumption of the heat dissipation system. BRIEF DESCRIPTION OF DRAWINGS

[0050] The application will be further described below in combination with the drawings and examples, in which:

[0051] Figure 1 is a structural schematic diagram of the heat dissipation system in some embodiments of the application;

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

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

[0054] In order to have a clearer understanding of the technical features, objects and effects of the application, the specific embodiments of the application will be described in detail with reference to the drawings.

[0055] It should be noted that the flowchart shown in the drawings is only illustrative, and does not necessarily include all the contents and operations / steps, nor does it necessarily execute in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so the actual execution order may be changed according to the actual situation.

[0056] The block diagram shown in the drawings is only a functional entity, and does not necessarily correspond to a physically independent entity. That is, the functional entities can be implemented in the form of software, 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 application provides a heat dissipation system for an energy storage system, wherein the energy storage system comprises a battery pack for storing electric energy and a component such as an energy storage converter for converting an output current or voltage of the battery pack into alternating current or direct current, and 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 effect, no temperature control hysteresis and the like. Figure 1 As shown in the figure, the heat dissipation system can comprise 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 the lines for conveying the cooling medium or refrigerant between the devices and the circuits in the present application are mechanically connected through pipelines, and will not be described one by one below. In addition, the cooling medium can be a liquid or a gas, and is preferably a liquid such as water or coolant.

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

[0060] In some embodiments, as shown in Figure 1 , the converter heat exchange device 10 can comprise a converter heat exchanger 18 and a first water pump 11.

[0061] The converter heat exchanger 18 comprises a first heat sink and a first circulating pipeline. The first heat sink is arranged on the energy storage converter, and the first circulating pipeline penetrates through the first heat sink. When the cooling medium with a temperature smaller than that of the energy storage converter flows through the first circulating pipeline, the cooling medium can exchange heat with the energy storage converter through the first heat sink, so as to cool the energy storage converter. It should be noted that the converter heat exchanger 18 can be an existing converter heat sink, 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 circulating pipeline, the common heat exchange branch 40 and the converter medium cooling branch 50, so as to provide circulating power for the cooling medium in the first circulating pipeline. Specifically, as shown in Figure 1 , the input end of the first water pump 11 is mechanically connected to the water return end of the first circulating pipeline, and the output end (equivalent to the water return end of the converter heat exchange device 10) of the first water pump 11 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, which is equivalent to arranging the first water pump 11 on the main channel of the first circulating pipeline, so that a single water pump can provide circulating power for all branches mechanically connected to the first circulating pipeline.

[0063] In some embodiments, the first water pump 11 is arranged as close as possible to the return end of the first circulation pipeline, so that the common heat exchange branch 40 and the inverter medium cooling branch 50 at the rear end of the first water pump 11 can generate less accumulated air bubbles during operation, so that the liquid in the common heat exchange branch 40 and the inverter medium cooling branch 50 can be more fully heat exchanged, and the heat exchange efficiency is improved. In addition, the first water pump 11 can be an existing electric pump. If the first water pump 11 is an electric pump with a self-protection function, such as liquid leakage detection and liquid shortage detection, the control device can also output an alarm signal according to the liquid leakage and liquid shortage detection results, so that the user can know the abnormality in advance to make treatment as soon as possible. That is, the protection function of the first water pump 11 can provide a certain degree of protection for the energy storage inverter, which can play a role similar to a buffer tank.

[0064] Please refer to Figure 1 , the water supply end of the battery heat exchange device 20 is connected to the cooling medium, and the return end of the battery heat exchange device 20 outputs the cooling medium, so as to dissipate heat from the battery pack through the cooling medium flowing through the inside thereof.

[0065] In some embodiments, the battery heat exchange device 20 can 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 pipeline. The second radiator is arranged on the battery pack, and the second circulation pipeline penetrates through the second radiator. When the cooling medium with a temperature lower than that of the battery pack flows through the second circulation pipeline, the cooling medium can exchange heat with the battery pack through the second radiator, so as to cool the battery pack. It should be noted that the battery heat exchanger 28 can be an existing battery radiator, and the specific structure can refer to the prior art, which will not be described 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, so as to provide circulating power for the cooling medium in the second circulation pipeline. Specifically, as shown in Figure 1 , 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 (equivalent to the return end of the battery heat exchange device 20) of the second water pump 21 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, which is equivalent to arranging the second water pump 21 on the main channel of the second circulation pipeline, so that a single water pump can provide circulating power for 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, so as to 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 less accumulated air bubbles during operation, so as to ensure that the liquid in the common heat exchange branch 40 and the battery medium cooling branch 60 can be more fully heat exchanged, 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 a self-protection function, such as a liquid leakage detection and a liquid shortage detection, the control device can also output an alarm signal according to the liquid leakage and liquid shortage detection results, so that the user can know the abnormality in advance to make treatment 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 converter, which can play a role similar to a buffer tank.

[0069] Referring to Figure 1 , the temperature testing device 30 is connected with the return end of the converter heat exchange device 10 and the return end of the battery heat exchange device 20, and is electrically connected with the control device. The temperature testing device 30 is used to test the cooling medium temperature output by the return end of the converter heat exchange device 10 and the return end of the battery heat exchange device 20, and inputs the converter return water temperature representing the cooling medium temperature output by the return end of the converter heat exchange device 10 and the battery return water temperature representing the cooling medium temperature output by the return end of the battery heat exchange device 20 to the control device.

[0070] In some embodiments, as shown in Figure 1 , the temperature testing device 30 can include a first thermometer 111 connected with the return end of the converter heat exchange device 10 and a second thermometer 211 connected with the return end of the battery heat exchange device 20. The first thermometer 111 and the second thermometer 211 can be existing temperature testers or temperature sensors.

[0071] Referring to Figure 1 , the common heat exchange branch 40 is mechanically connected with the converter heat exchange device 10 and the battery heat exchange device 20. When there is a temperature difference between the cooling medium output by the return end of the converter heat exchange device 10 and the return end of the battery heat exchange device 20, the medium output by the two can be heat exchanged, so as to maximize the use of the temperature difference between the cooling medium output by the converter heat exchange device 10 and the battery heat exchange device 20 to achieve heat dissipation, thereby helping to improve the economy.

[0072] In Figure 1In the shown embodiment, the common heat exchange branch 40 can include a first heat exchange device 15, which includes a first channel and a second channel that are not in communication with each other, 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 inverter 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 can be an existing heat exchange device.

[0073] In some embodiments, the first heat exchange device 15 is arranged as close as possible to the water return end of the inverter heat exchange device 10 and the battery heat exchange device 20, so as to make the most of the high temperature characteristics of the cooling medium at the water return end of the inverter heat exchange device 10 and the battery heat exchange device 20, to avoid the problem of condensate water caused by excessively low pipeline temperature to the greatest extent, and to reduce the amount of heat preservation cotton used in pipeline arrangement to some extent, which is positive for improving user experience and reducing cost.

[0074] In other embodiments, the common heat exchange branch 40 can 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 in communication with each other, the water inlet end of the first channel is mechanically connected to the water return end of the inverter 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 inverter heat exchange device 10; the water inlet end of the second channel is mechanically connected to the water return 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, so as to turn on the first valve and the second valve when the first control is executed, so that the cooling medium in the first channel and the second channel can exchange heat with each other. 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 the difference between this embodiment and the embodiment shown in Figure 1 The difference between the embodiment shown in this embodiment and the embodiment shown in

[0075] Please refer to Figure 1 The inverter medium cooling branch 50 is mechanically connected to the inverter heat exchange device 10, and can rapidly cool at least part of the cooling medium output by the water return end of the inverter heat exchange device 10 when the second control is executed, so as to improve the heat dissipation efficiency.

[0076] In Figure 1In the shown embodiment, the converter medium cooling branch 50 can include the first radiator 16 and the 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 is matched with the first radiator 16 and is electrically connected with the control device to be started when the second control is executed. The first radiator 16 can be an existing radiator and the first fan 117 can be an existing fan or a fan.

[0077] In other embodiments, the converter medium cooling branch 50 can include a third valve, the first radiator 16 and the first fan 117. The third valve is electrically connected with the control device to be turned on when the second control is executed. One end of the first radiator 16 is mechanically connected to the water return end of the converter heat exchange device 10 through 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 is matched with the first radiator 16 and is electrically connected with the control device to be started when the second control is executed. The third valve can be an existing electric valve. It should be noted that the difference between this embodiment and the above-mentioned embodiment is that the third valve is used to control the opening and closing of the converter medium cooling branch 50 and the water return end of the converter heat exchange device 10. Figure 1 The difference between the shown embodiment and the above-mentioned embodiment is that the opening and closing of the converter medium cooling branch 50 and the water return end of the converter heat exchange device 10 can be realized 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 is helpful to improve the flow control accuracy of the cooling medium input to the first radiator 16.

[0078] Please refer to Figure 1 The battery medium cooling branch 60 is mechanically connected with the battery heat exchange device 20 and can rapidly cool at least part of the cooling medium output by the water return end of the battery heat exchange device 20 when the third control is executed to improve the heat dissipation efficiency.

[0079] In Figure 1In the shown embodiment, the battery medium cooling branch 60 can include the second heat exchange device 25, the compressor 31, the second radiator 32, the throttling valve 33 and the second fan 317. The second heat exchange device 25 includes a third channel and a fourth channel which are not communicated with 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 gas inlet end of the fourth channel is connected to the low-temperature and high-pressure refrigerant, and the gas outlet end of the fourth channel outputs the low-temperature and low-pressure refrigerant obtained by the low-temperature and high-pressure refrigerant after heat exchange with the cooling medium of the third channel. The input end of the compressor 31 is mechanically connected to the gas outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant, and the output end of the compressor 31 outputs the high-temperature and high-pressure refrigerant. The input end of the second radiator 32 is mechanically connected to the output end of the compressor 31. The throttling valve 33 is mechanically connected between the output end of the second radiator 32 and the gas inlet end of the fourth channel to throttle the low-temperature and high-pressure refrigerant input to the fourth channel to avoid too large flow to damage the fourth channel. The second fan 317 cooperates with the second radiator 32 and is also electrically connected to the control device to be started when the third control is executed.

[0080] In other embodiments, the battery medium cooling branch 60 can include a fourth valve, the second heat exchange device 25, the compressor 31, the second radiator 32, the throttling valve 33 and the second fan 317. The fourth valve is electrically connected to the control device to be turned on when the third control is executed. The second heat exchange device 25 includes a third channel and a fourth channel which are not communicated with each other. The water inlet end of the first channel is mechanically connected to the water return 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 gas inlet end of the fourth channel is connected to the low-temperature and high-pressure refrigerant, and the gas outlet end of the fourth channel outputs the low-temperature and low-pressure refrigerant obtained by the low-temperature and high-pressure refrigerant after heat exchange with the cooling medium of the third channel. The input end of the compressor 31 is mechanically connected to the gas outlet end of the fourth channel to compress the low-temperature and low-pressure refrigerant, and the output end of the compressor 31 outputs the high-temperature and high-pressure refrigerant. The input end of the second radiator 32 is mechanically connected to the output end of the compressor 31. The throttling valve 33 is mechanically connected between the output end of the second radiator 32 and the gas inlet end of the fourth channel to throttle the low-temperature and high-pressure refrigerant input to the fourth channel to avoid too large flow to damage the fourth channel. The second fan 317 cooperates with the second radiator 32 and is also electrically connected to the control device to be started when the third control is executed. The fourth valve can be an existing electric valve. It should be noted that the difference between the present embodiment and the above-mentioned embodiments is that the battery medium cooling branch 60 can be connected to or disconnected from the water return end of the battery heat exchange device 20 without relying on the first three-way valve 12 and the second three-way valve 22. Since the opening degree of the fourth valve can be independently controlled, the present embodiment is helpful to improve the flow control accuracy of the cooling medium input to the second heat exchange device 25. Figure 2 The difference between the shown embodiment and the above-mentioned embodiments is that the battery medium cooling branch 60 can be connected to or disconnected from the water return end of the battery heat exchange device 20 without relying on the first three-way valve 12 and the second three-way valve 22. Since the opening degree of the fourth valve can be independently controlled, the present embodiment is helpful to improve the flow control accuracy of the cooling medium input to the second heat exchange device 25.

[0081] To improve the heat dissipation effect of the second heat sink 32, in some embodiments, the refrigerant can be an existing gaseous refrigerant.

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

[0083] The first control includes: controlling the common heat exchange branch 40 to be communicated, so that the cooling medium with temperature difference output by the return water ends of the inverter heat exchange device 10 and the battery heat exchange device 20 is heat exchanged in the common heat exchange branch 40. Specifically, when the control device executes the first control, it controls the common heat exchange branch 40 to be communicated with the return water end of the inverter heat exchange device 10 and the return water end of the battery heat exchange device 20 respectively, so that the cooling medium with temperature difference output by the return water ends of the battery heat exchange device 20 and the battery heat exchange device 20 can be heat exchanged in the common heat exchange branch 40, and the high-temperature cooling medium can be heat exchanged with the low-temperature cooling medium. Understandably, the cooling process of the first control does not need to start the compressor and the heat sink and the like, and mainly utilizes the low-temperature cooling medium for cooling, so that the first control can achieve the energy-saving effect.

[0084] The second control includes: controlling the inverter medium cooling branch 50 to be communicated, so as to cool at least part of the cooling medium output by 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 communicated with the return water end of the inverter heat exchange device 10, and controls the inverter medium cooling branch 50 to work, so as to input at least part of the cooling medium output by the return water end of the inverter heat exchange device 10 into the inverter medium cooling branch 50, and then cool the cooling medium by using the inverter medium cooling branch 50 (such as air cooling, liquid cooling and the like). Since the cooling efficiency of the inverter medium cooling branch 50 on the cooling medium is higher than that of the common heat exchange branch 40, the temperature of the cooling medium will decrease faster, thereby improving the cooling performance of the inverter heat exchange device 10. Understandably, when the first control and the second control are executed at the same time, since the cooling medium output by the inverter heat exchange device 10 and the battery heat exchange device 20 is heat exchanged in the common heat exchange branch 40, when the temperature of the cooling medium output by the return water end of the inverter heat exchange device 10 decreases faster, the heat exchange efficiency of the common heat exchange branch 40 is also improved.

[0085] The third control comprises controlling the battery medium cooling branch 60 to be connected to cool at least part of the cooling medium output by the water return end of the battery heat exchange device 20. Specifically, when the second control is performed, the control device controls the battery medium cooling branch 60 to be connected to the water return end of the battery heat exchange device 20, and controls the battery medium cooling branch 60 to work so that at least part of the cooling medium output by the water return end of the battery heat exchange device 20 is input into the battery medium cooling branch 60, and the cooling medium is cooled (e.g. air cooling, liquid cooling, etc.). Since the cooling efficiency of the battery medium cooling branch 60 is higher than that of the inverter medium cooling branch 50, the temperature of the cooling medium will decrease 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 performed at the same time, since the cooling medium output by the inverter heat exchange device 10 and the battery heat exchange device 20 is exchanged in the common heat exchange branch 40, when the temperature of the cooling medium output by the water return end of the battery heat exchange device 20 decreases rapidly, the heat exchange efficiency of the common heat exchange branch 40 is also improved.

[0086] In some embodiments, as shown in Figure 2 The control device can comprise a calculation unit 71 and a control unit 72. The calculation unit 71 is electrically connected to the first temperature meter 111 and the second temperature meter 211 to obtain the inverter water return temperature and the battery water return temperature, calculate the difference between the inverter water return temperature and the battery water return temperature, and output a temperature difference representing the difference between the inverter water return temperature and the battery water return temperature. The calculation unit 71 can be a subtracter.

[0087] As shown in Figure 3 The control unit 72 is electrically connected to the calculation unit 71, the inverter heat exchange device 10, the battery heat exchange device 20, the common heat exchange branch 40, the inverter medium cooling branch 50, and the battery medium cooling branch 60. The control unit 72 is configured to perform a thermal management step according to the temperature difference.

[0088] Specifically, as shown in Figure 2 The thermal management step can comprise steps S1, S2, S3, S4, S5, S6, and S7.

[0089] Step S1 comprises determining a temperature interval in which the temperature difference is located according to a temperature interval list. The temperature interval comprises 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 in the first temperature interval, executing the first control and the third control, and setting the rotation speed of the compressor 31 to a first set speed. In this step, when the temperature difference is in the first temperature interval (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 outputted by the inverter heat exchange device 10 and the battery heat exchange device 20 is large enough, the efficiency of the low-temperature cooling medium taking away the heat of the high-temperature cooling medium is high (i.e. the heat exchange effect of the common heat exchange branch 40 is high), therefore, the control unit 72 sets the rotation speed of the compressor 31 to the first set speed (less than the maximum rotation speed of the compressor 31) when executing the third control, so that the low-temperature cooling medium can sufficiently cool the high-temperature cooling medium, and the rotation speed of the compressor 31 can be reduced, thereby reducing the power consumption of the heat dissipation system.

[0091] Step S3 includes: when the temperature difference is in the second temperature interval, executing the first control and the third control, and setting the rotation speed of the compressor 31 to a second set speed, the second set speed is greater than the first set speed. In this step, when the temperature difference is in the second temperature interval (i.e. the temperature difference is between the temperature T3 and the temperature T2), the control unit 72 executes the first control and the third control, since the temperature difference of the cooling medium outputted by the inverter heat exchange device 10 and the battery heat exchange device 20 is relatively small, the efficiency of the low-temperature cooling medium taking away the heat of the high-temperature cooling medium is low (i.e. the heat exchange effect of the common heat exchange branch 40 is low), therefore, the control unit 72 sets the rotation speed of the compressor 31 to the second set speed (which can be the maximum rotation speed of the compressor 31) when executing the third control, thereby improving the cooling efficiency of the battery medium cooling branch 60, and rapidly reducing the temperature of the cooling medium outputted by the return water end of the battery heat exchange device 20, when the temperature of the cooling medium outputted by the return water end of the battery heat exchange device 20 is reduced, the temperature difference will become large again, so that the heat exchange effect of the common heat exchange branch 40 will increase again, so that the temperature of the cooling medium outputted by the return water end of the inverter heat exchange device 10 and the battery heat exchange device 20 can be rapidly reduced.

[0092] Step S4 includes: when the temperature difference is in the third temperature interval, executing the first control, the second control and the third control, and setting the rotation speed of the compressor 31 to the second set speed. In this step, when the temperature difference is in the third temperature interval (i.e. the temperature difference is between 0℃ and the temperature T3), it is indicated that the temperature difference of the cooling medium outputted by the inverter heat exchanger 10 and the battery heat exchanger 20 is very small, and the control unit 72 will execute the first control, the second control and the third control, and set the rotation speed of the compressor 31 to the second set speed (which can be the maximum rotation speed of the compressor 31), so as to improve the cooling efficiency of the battery medium cooling branch 60, and the execution of the second control also makes the inverter medium cooling branch 50 participate in the cooling work, so that the temperature of the cooling medium outputted by the inverter heat exchanger 10 is reduced, and thus the temperature of the cooling medium outputted by the inverter heat exchanger 10 and the battery heat exchanger 20 can be significantly reduced.

[0093] In order to further improve the cooling efficiency, the step S4 can further include: the control unit 72 controls the opening degree 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, and the greater the temperature difference, the greater the opening degree between the first valve port and the second valve port of the second three-way valve 22, and the smaller the opening degree between the first valve port and the third valve port of the second three-way valve 22.

[0094] Step S5 includes: when the temperature difference is in the fourth temperature interval, executing the first control. In this step, when the temperature difference (negative number) is in the fourth temperature interval (i.e. the temperature difference is less than or equal to the temperature T4), the control unit 72 executes the first control and the third control, and sets the rotation speed of the compressor 31 to the first set speed, so as to make full use of the low-temperature cooling medium to cool the high-temperature cooling medium, and help to reduce the power consumption of the heat dissipation system.

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

[0096] In this step, when the temperature difference is in the fifth temperature interval (i.e. the temperature difference is between the temperature T5 and the temperature T6), the control unit 72 executes the first control and the third control, and sets the rotation speed of the compressor 31 to the second set speed, so as to improve the cooling efficiency of the battery medium cooling branch 60, and make the temperature of the cooling medium outputted by the inverter heat exchanger 10 and the battery heat exchanger 20 quickly decrease, because the absolute value of the temperature difference of the cooling medium outputted by the inverter heat exchanger 10 and the battery heat exchanger 20 is relatively small, and the heat exchange effect of the common heat exchange branch 40 is low.

[0097] Step S7 includes: when the temperature difference is within the sixth temperature range, 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℃), it indicates that the absolute value of the temperature difference between the cooling medium output from the return water end of the inverter heat exchanger 10 and the battery heat exchanger 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) to improve the cooling efficiency of the battery medium cooling branch 60. At the same time, the execution of the second control will also make the inverter 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 inverter heat exchanger 10 is reduced. In this way, the temperature of the cooling medium output from the return water end of the inverter heat exchanger 10 and the battery heat exchanger 20 can be significantly reduced.

[0099] To further improve cooling efficiency, step S7 may also include: the control unit 72 further controls the opening degree between the first and second valve ports and between the first and third valve ports of the second three-way valve 22 based on 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 degree between the first and second valve ports of the second three-way valve 22 and the smaller the opening degree between the first and third valve ports of the second three-way valve 22.

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

[0101] In some embodiments, such as ​ As shown, the heat dissipation system may also include a human-machine interface device, which is electrically connected to the control unit 72 to generate a mode setting signal based on user operation. Accordingly, the control unit 72 is also used to set the operating mode to an energy-saving operating mode or a normal operating mode according to the mode setting signal. When in the energy-saving operating mode, thermal management steps are performed based on the temperature difference; when in the normal operating mode, the first control is performed.

[0102] The technical scheme of the present application is implemented by performing 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 water return end of the converter heat exchange device 10 and the battery heat exchange device 20, wherein the first control is performed to make full use of the low-temperature cooling medium for cooling, thereby effectively improving the energy saving performance and reducing the energy consumption of the heat dissipation system, and the second control or the third control is performed to improve the heat dissipation efficiency of the cooling medium output from the water return end of the converter heat exchange device 10 or the battery heat exchange device 20, thereby ensuring that the heat dissipation performance of the converter heat exchange device 10 and the battery heat exchange device 20 meets the requirements, so as to avoid over-temperature damage of the energy storage converter and the battery pack, and the temperature difference is calculated by directly collecting the temperature of the cooling medium output from the water return end of the converter heat exchange device 10 and the battery heat exchange device 20, which is equivalent to directly using the change of 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, thereby having the advantages of fast control response and no temperature control hysteresis.

[0103] The present application also provides an air conditioning equipment, comprising an energy storage system and the heat dissipation system provided by the embodiment of the present application.

[0104] The embodiments in the specification are 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 embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0105] The skilled person can further realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical scheme. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0106] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be directly implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can 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 embodiments of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation to the patent scope of the present application; it should be pointed out that the above technical features can be freely combined without departing from the concept of the present application for those skilled in the art, and a number of modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification made to the patent claim scope of the present application shall belong to the coverage of the patent claim of the present application.

Claims

1. A heat dissipation system for an energy storage system, the energy storage system comprising an energy storage converter and a battery pack, characterized by, The heat dissipation system comprises: a converter heat exchange device (10) having a water supply end connected to a cooling medium and a water return end outputting the cooling medium to dissipate heat from the energy storage converter by the cooling medium flowing through the inside of the converter heat exchange device; a battery heat exchange device (20) having a water supply end connected to the cooling medium and a water return end outputting the cooling medium to dissipate heat from the battery pack by the cooling medium flowing through the inside of the battery heat exchange device; a temperature testing device (30) for testing the temperature of the cooling medium outputted by the water return end of the converter heat exchange device (10) and the battery heat exchange device (20) to obtain a converter water return temperature and a battery water return 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), wherein the cooling efficiency of the battery medium cooling branch (60) is higher than that of the converter medium cooling branch (50); and a control device performing at least one of a first control, a second control and a third control according to the temperature difference between the converter water return temperature and the battery water return temperature; the first control comprises controlling the common heat exchange branch (40) to be connected so that the cooling medium outputted by the water return end of the converter heat exchange device (10) and the battery heat exchange device (20) having a temperature difference is heat exchanged in the common heat exchange branch (40); the second control comprises controlling the converter medium cooling branch (50) to be connected to cool at least part of the cooling medium outputted by the water return end of the converter heat exchange device (10); the third control comprises controlling the battery medium cooling branch (60) to be connected to cool at least part of the cooling medium outputted by the water return end of the battery heat exchange device (20); the control device comprises: a control unit for performing a heat management step according to the temperature difference, comprising: determining a temperature interval in which the temperature difference is located according to a temperature interval list; when the temperature difference is in a first temperature interval or a second temperature interval, performing the first control and the third control; when the temperature difference is in a third temperature interval, performing the first control, the second control and the third control; when the temperature difference is in a fourth temperature interval, performing the first control; when the temperature difference is in a fifth temperature interval, performing the first control and the second control; when the temperature difference is in a sixth temperature interval, performing the first control, the second control and the third control; wherein the temperature interval comprises 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℃], T1 > T2 > T3 > 0℃, T4 < T5 < T6 < 0℃.

2. The heat dissipation system of claim 1, wherein, 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 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 to 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 of claim 2, wherein, The converter heat exchange device (10) comprises: a converter heat exchanger (18) comprising a first circulating pipeline; and a first water pump (11) mechanically connected to the first circulating pipeline and the first valve port of the first three-way valve (12) to provide circulating power for the cooling medium in the first circulating pipeline; The battery heat exchange device (20) comprises: a battery heat exchanger (28) comprising a second circulating pipeline; and a second water pump (21) mechanically connected to the second circulating pipeline and the first valve port of the second three-way valve (22) to provide circulating power for the cooling medium in the second circulating pipeline.

4. The heat dissipation system of claim 2, wherein, The common heat exchange branch (40) comprises: a first heat exchange device (15) disposed close to the return water end of the converter heat exchange device (10) and the battery heat exchange device (20), comprising 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 (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.

5. The heat dissipation system of claim 2, wherein, 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 the water supply end of the converter heat exchange device (10); and a first fan (117) cooperating with the first radiator (16) and also electrically connected to the control device to be started when the second control is executed. The battery medium cooling branch (60) comprises:

6. The heat dissipation system of claim 4, wherein, ​ The second heat exchange device (25) comprises a third channel and a fourth channel, 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 gas inlet end of the fourth channel is connected to low-temperature and high-pressure refrigerant, and the gas outlet end of the fourth channel outputs low-temperature and low-pressure refrigerant obtained by the low-temperature and high-pressure refrigerant after heat exchange with the cooling medium of the third channel; The compressor (31) is mechanically connected to the gas outlet end of the fourth channel, compresses the low-temperature and low-pressure refrigerant, and outputs high-temperature and high-pressure refrigerant through the output end thereof; 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 gas inlet end of the fourth channel, and throttles the low-temperature and high-pressure refrigerant input into the fourth channel; The second fan (317) cooperates with the second radiator (32) and is electrically connected to the control device to be started when the third control is performed. The control device further comprises:

7. The heat dissipation system of claim 6, wherein, A calculation unit for calculating the difference between the return water temperature of the current transformer and the return water temperature of the battery to obtain the temperature difference; The control unit performs the heat management step according to the temperature difference, and further comprises: When the temperature difference is in the first temperature range, the rotating speed of the compressor (31) is set to a first set speed; When the temperature difference is in the second temperature range, the rotating speed of the compressor (31) is set to a second set speed, and the second set speed is greater than the first set speed; When the temperature difference is in the third temperature range, the rotating speed of the compressor (31) is set to the second set speed. The temperature difference ranges of T1 and T2, T2 and T3, T6 and T5, and T5 and T4 are 5-10℃.

8. The heat dissipation system of claim 7, wherein, The heat dissipation system further comprises a man-machine interaction device for generating a mode setting signal according to user operation; 9. The heat dissipation system of claim 7, wherein, The control unit is further configured to set the working mode to an energy-saving working mode or a regular working mode according to the mode setting signal, and only perform the heat management step according to the temperature difference when in the energy-saving working mode, and perform the first control when in the regular working mode. The heat dissipation system comprises an energy storage current transformer, a battery pack, and a heat dissipation system according to any one of claims 1-9.

10. An energy storage system characterized by, ​

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