Split type energy storage container temperature control system with cold storage / heat storage function

Abstract

The split type energy storage container temperature control system with the cold / heat storage function comprises a heat pump system, and the heat pump system comprises a refrigerating loop and a liquid cooling loop which are connected through a heat exchanger; the temperature control system further comprises a bypass loop arranged on the liquid cooling loop, and the bypass loop is provided with an energy storage water tank with a pre-cold storage / heat storage function. The heat pump system is started according to the working environment of the battery to store cold / heat in advance for the energy storage water tank, and when the energy storage water tank works, the heat load requirement of the battery cell group is dynamically met, so that the situation that a large horse pulls a trolley or the heat pump system is frequently started and stopped is avoided; besides, the energy storage water tank provides cold or heat for the battery cell group mainly, the heat pump system is used as an auxiliary, the controller can timely start the heat pump system for cold and heat compensation according to a temperature change curve of the battery cell group, the working time of the heat pump system is greatly shortened, and the effects of energy conservation and cost reduction in the energy storage temperature control process are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply equipment, and more particularly to a split type energy storage container temperature control system with cold storage / heat storage function. BACKGROUND

[0002] With the rapid construction and large-scale development of new power systems in recent years in the mode of "new energy + energy storage", the application of power supply or grid side container energy storage based on electrochemical energy storage is becoming more and more widespread. The construction of new energy storage, especially electrochemical energy storage, has more prospects. Electrochemical energy storage represented by lithium ion batteries will be the main carrier of domestic power supply or grid side energy storage.

[0003] In order to prevent the charging and discharging performance of energy storage batteries from being reduced, even explosion, thermal runaway and other conditions when working in high temperature or low temperature area, and further improve the safety of energy storage system, the temperature control system with air cooling and liquid cooling as the main technology has become an essential accessory of energy storage container. With the development of energy storage batteries towards high energy density and high charging rate, the heat generation of the batteries is increasing, and the traditional air cooling temperature control system may not meet the heat dissipation demand, and the liquid cooling system has gradually become the development trend of energy storage container temperature control.

[0004] The core of the temperature control system is the heat dissipation module, which is a device for dissipating heat to the surrounding environment. The traditional integrated design integrates the heat dissipation module inside the temperature control system. With the increasing heat dissipation density of the current energy storage batteries, the internal integrated heat dissipation module is affected by the limited heat dissipation area, which affects the corresponding matching of the power of the temperature control system.

[0005] In the actual use process of the liquid cooling system, due to the change of the working condition of the energy storage container with the season, or the deviation between the standard configuration of the temperature control system and the actual application, the supply and demand may not match. When the battery heat dissipation load is less than the power of the temperature control system, the temperature control system may be overpowered, or the temperature control system may be frequently started and stopped, and the stability and energy saving of the temperature control system may also be affected. CONTENT OF THE INVENTION

[0006] The present application provides a split type energy storage container temperature control system with cold storage / heat storage function. The heat pump system is started to pre-store cold / heat in the energy storage water tank according to the working environment of the battery. When the energy storage water tank is working, the controller adjusts the flow rate and temperature of the fluid in the liquid cooling loop to dynamically meet the heat load demand of the battery cell group, so as to avoid the situation of overpowered or frequent start and stop of the heat pump system. In addition, the present application mainly provides cold or heat for the battery cell group with the heat pump system as the supplement. The controller can start the heat pump system in time to compensate for the cold or heat according to the temperature change curve of the battery cell group, greatly reducing the working time of the heat pump system, and realizing the energy saving and cost reduction effect of the energy storage temperature control process.

[0007] The application provides a split type energy storage container temperature control system with cold storage / heat storage function, comprising a heat pump system, the heat pump system comprising a refrigeration circuit and a liquid cooling circuit connected through a heat exchanger;

[0008] The temperature control system further comprises a bypass circuit arranged on the liquid cooling circuit, and the bypass circuit is provided with an energy storage water tank with pre-cold storage / heat storage function.

[0009] Preferably, the liquid cooling circuit comprises a water pump, a first electromagnetic valve and a second electromagnetic valve arranged in sequence between the water pump and the heat exchanger, a pipeline heater, a third electromagnetic valve arranged in sequence at the rear end of the heat exchanger, and a group of liquid cooling heat exchange plates attached to the battery cell group.

[0010] Preferably, the bypass circuit comprises a fourth electromagnetic valve and the energy storage water tank arranged in parallel on the first electromagnetic valve.

[0011] Preferably, the bypass circuit further comprises a fifth electromagnetic valve arranged at the front end of the water pump and the front end of the third electromagnetic valve.

[0012] Preferably, the temperature control system further comprises a controller, and the controller is configured to control the refrigeration circuit or the pipeline heater to work according to the battery working environment, so as to pre-store cold or heat for the energy storage water tank through the bypass circuit.

[0013] Preferably, the controller is configured to control the power of the refrigeration circuit or the pipeline heater according to the battery working environment, so as to pre-store cold or heat of appropriate temperature for the energy storage water tank through the bypass circuit.

[0014] Preferably, the first condensing component of the refrigeration circuit is arranged at the top of the energy storage container, and the components of the heat pump system other than the first condensing component are arranged inside the energy storage container.

[0015] Preferably, the energy storage water tank is arranged above the components of the energy storage container other than the first condensing component.

[0016] Preferably, the top of the energy storage container is provided with a plurality of air inlet channels and dustproof nets, a first fan of the first condensing component is arranged at the side of the upper part of the energy storage container, a first radiator of the first condensing component is arranged at the inner side of the upper part of the energy storage container, and an exhaust fan is arranged between the first fan and the radiator.

[0017] Preferably, the heat pump system further comprises a natural liquid cooling circuit arranged between the front end of the second electromagnetic valve and the rear end of the heat exchanger, and a second condensing component of the natural liquid cooling circuit is arranged at the top of the energy storage container.

[0018] Other features and advantages of the application will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0020] Figure 1 A control schematic of the split type energy storage container temperature control system with cold storage / heat storage function provided in the present application;

[0021] Figure 2 A structural diagram of the energy storage container and temperature control system provided in the present application;

[0022] Figure 3 and 4 A structural diagram of one embodiment of the condensing assembly at the top of the energy storage container provided in the present application. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0024] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application or its application or uses.

[0025] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0026] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of exemplary embodiments can have different values.

[0027] The present application provides a split type energy storage container temperature control system with cold storage / heat storage function, which pre-cools / heat-stores the energy storage tank according to the working environment of the battery, and uses the energy storage tank to dynamically meet the thermal load demand of the battery cell group by adjusting the flow rate and temperature of the fluid in the liquid cooling loop, avoiding the situation of overloading or frequent starting and stopping of the heat pump system. In addition, the present application mainly provides cold or heat to the battery cell group using the energy storage tank, and the heat pump system is auxiliary. The controller can start the heat pump system in time to compensate for the cold or heat according to the temperature change curve of the battery cell group, greatly reducing the working time of the heat pump system, and achieving the effect of energy saving and cost reduction in the energy storage temperature control process. Further, the condensing assembly and other components of the liquid cooling loop and the natural liquid cooling loop are arranged in a split type, which provides a space for the energy storage tank. Such a split type structure also provides a solution for the development trend of high-power and high-heat flux density of the energy storage container.

[0028] As Figure 1 shown, the split type energy storage container temperature control system with cold storage / heat storage function provided by the present application comprises a controller, a heat pump system and a bypass circuit, and the controller is used to control the electromagnetic valve or other controlled devices in the heat pump system and the bypass circuit.

[0029] As an embodiment, as Figure 1 shown, the heat pump system comprises a refrigeration circuit and a liquid cooling loop connected through a heat exchanger (e.g., a plate heat exchanger). Figure 1

[0030] As Figure 1 shown, the liquid cooling loop comprises a water pump, a first electromagnetic valve and a second electromagnetic valve arranged in sequence between the water pump and the heat exchanger, a pipeline heater arranged at the rear end of the heat exchanger, a third electromagnetic valve, and a set of liquid cooling heat exchange plates attached to the battery cell group. Under the drive of the water pump, the cooling liquid passes through the first electromagnetic valve, the second electromagnetic valve, the heat exchanger, the pipeline heater, the third electromagnetic valve and reaches the liquid cooling heat exchange plate, and after heat exchange with the battery cell group, the cooling liquid returns to the water pump, realizing the circulation of the cooling liquid.

[0031] As Figure 1 shown, the refrigeration circuit comprises a compressor, a first condensing assembly (including a first radiator and a first fan), a liquid accumulator, an electronic expansion valve and a heat exchanger arranged in sequence. After the compressor is started, the refrigerant passes through the first condensing assembly, the liquid accumulator and the electronic expansion valve to reach the heat exchanger, and the heat exchange between the cooling liquid in the liquid cooling loop and the refrigerant in the refrigeration circuit is realized in the heat exchanger. Among them, the controller controls the power of the compressor through the opening degree of the electronic expansion valve, so as to control the flow rate and temperature of the cooling liquid in the liquid cooling loop.

[0032] When the battery cell group needs to be cooled, the refrigeration circuit is started, the pipeline heater is closed, and the temperature of the battery cell group is reduced by reducing the temperature of the cooling liquid. When the battery cell group needs to be heated, the refrigeration circuit is closed, and the pipeline heater is started, and the temperature of the battery cell group is increased by increasing the temperature of the cooling liquid.

[0033] As Figure 1 shown, the bypass circuit is arranged on the liquid cooling loop, and the bypass circuit is provided with an energy storage water tank with pre-cold storage / heat storage function. Specifically, the bypass circuit comprises a fourth electromagnetic valve and an energy storage water tank arranged in parallel on the first electromagnetic valve. The bypass circuit further comprises a fifth electromagnetic valve arranged at the front end of the water pump and the front end of the third electromagnetic valve.

[0034] ​When the heat pump system is not needed to work for the battery pack, preferably in the time period of low electricity price, the heat pump system is started to pre-store cold / heat for the energy storage tank. When pre-storing cold, the refrigeration circuit is started, the pipe heater, the third solenoid valve and the first solenoid valve are closed, under the driving of the water pump, the coolant passes through the fourth solenoid valve, the energy storage tank, the second solenoid valve, the heat exchanger, the pipe heater and the fifth solenoid valve and then returns to the water pump, so that the water in the energy storage tank is cooled. When pre-storing heat, the refrigeration circuit, the third solenoid valve and the first solenoid valve are closed, the pipe heater is opened, under the driving of the water pump, the coolant passes through the fourth solenoid valve, the energy storage tank, the second solenoid valve, the heat exchanger, the pipe heater and the fifth solenoid valve and then returns to the water pump, so that the water in the energy storage tank is heated.

[0035] When the battery pack needs to adjust temperature, the refrigeration circuit, the pipe heater, the first solenoid valve and the fifth solenoid valve are closed, under the driving of the water pump, the coolant passes through the fourth solenoid valve, the energy storage tank, the second solenoid valve, the heat exchanger, the pipe heater and the third solenoid valve and then enters the liquid cooling heat exchange plate, so as to realize the temperature rise (at this time the energy storage tank pre-stores heat) or temperature drop (at this time the energy storage tank pre-stores cold) of the battery pack, and then the coolant returns to the water pump to realize circulation.

[0036] As another embodiment, as shown in Figure 1 the heat pump system further comprises a natural liquid cooling circuit arranged between the front end of the second solenoid valve and the rear end of the heat exchanger, which comprises a sixth solenoid valve, a second condensing assembly (including a second radiator and a second fan) and a seventh solenoid valve.

[0037] Based on the above, the controller controls the refrigeration circuit or the pipe heater to work according to the working environment of the battery, so as to pre-store cold or heat for the energy storage tank through the bypass circuit. For example, in summer, the controller controls the energy storage tank to pre-store cold through the refrigeration circuit. In winter, the controller controls the energy storage tank to pre-store heat through the pipe heater.

[0038] Further, the controller is configured to control the power of the refrigeration circuit or the pipe heater according to the working environment of the battery, so as to pre-store cold or heat of appropriate temperature for the energy storage tank through the bypass circuit. For example, in spring and autumn, the controller can determine the temperature of the cold or heat in the energy storage tank according to the difference between the temperature of the battery pack and the ambient temperature (at this time the difference is generally small), so as to store cold or heat of appropriate temperature by controlling the power of the refrigeration circuit or the power of the pipe heater. In contrast, in summer and winter, the difference between the ambient temperature and the temperature of the battery pack is large, so the controller needs to increase the power of the refrigeration circuit or the power of the pipe heater to store cold or heat of appropriate temperature.

[0039] On the basis of the above, Figures 2-4 a structural diagram of an embodiment of the energy storage container and the temperature control system is given. As shown in Figure 2As shown, the first condensing assembly 2 of the refrigeration circuit and the second condensing assembly 8 of the natural liquid cooling circuit are arranged at the top of the energy storage container 1, and the components 4 of the heat pump system other than the first condensing assembly 2 and the second condensing assembly 8 having the heat dissipation function are arranged inside the energy storage container 1.

[0040] As shown, Figure 2 The cell group 6 is stacked and arranged at one side inside the energy storage container 1, and one liquid cooling heat exchange plate 7 is attached to each cell. The liquid cooling heat exchange plate 7 is connected with the pipeline 5 of the liquid cooling circuit. The components 4 are arranged at the lower part of the other side inside the energy storage container 1, and the energy storage water tank 3 is arranged above the components 4 inside the energy storage container 1.

[0041] As an embodiment, as shown in Figure 3 and 4 The top of the energy storage container 1 is provided with a plurality of air inlet channels 21 and dustproof nets 22, the first fan 23 of the first condensing assembly is arranged at one side (the right side as shown in Figure 3 ) of the center of the top of the energy storage container 1, the first radiator 24 of the first condensing assembly is arranged at the inner side of the upper part of the energy storage container 1, opposite to the first fan 23, and the first radiator 24 is provided with a drain hole 25. When the temperature control system is working, the air with lower temperature can enter the surrounding of the first radiator 24 through the air inlet channels 21 and the dustproof nets 22, and the first fan 23 can suck the air from the surrounding of the first radiator 24 to dissipate the heat exchanged by the cell group 6 to the surrounding environment.

[0042] In order to reduce the influence of dust, sand, rain, snow and the like in the natural environment on the condensing assembly and reduce the damage or operation accidents of the container liquid cooling temperature control system, preferably, as shown in Figure 3 and 4 The top of the energy storage container 1 is provided with a plurality of air inlet channels and dustproof nets, and the first radiator of the first condensing assembly is arranged at the inner side of the upper part of the energy storage container 1. The difference lies in that the first fan of the first condensing assembly is arranged at the side of the upper part of the energy storage container 1 to realize side air inlet, and the exhaust fan is arranged between the first fan and the first radiator to enhance the air outlet amount and uniformity of the first radiator.

[0043] The arrangement mode of the second condensing assembly in the natural liquid cooling circuit is the same as that of the first condensing assembly.

[0044] The beneficial effects of the present application are as follows:

[0045] 1. The present application mainly provides cold or heat for the cell group by the energy storage water tank, and the heat pump system is auxiliary. The controller controls and adjusts the flow rate and temperature of the liquid cooling loop containing the energy storage water tank according to the change of the cell temperature, and timely starts the heat pump system to realize the precise temperature control of the battery in the energy storage container. The energy storage water tank can realize dynamic adjustment and precise temperature control, which can avoid frequent starting of the heat pump system when the battery is in small load heat dissipation, and realize stable temperature control process;

[0046] 2. When the seasonal load changes, the energy storage water tank pre-stores the cold / heat corresponding to the temperature, which basically meets the demand of the battery cell group, can prolong the interval time of the start of the heat pump system, and realizes energy saving of the system;

[0047] 3. The application can use valley electricity to pre-store cold / heat for the energy storage water tank, and reduce the temperature control cost;

[0048] 4. The energy storage water tank can provide the battery cell with temperature-stable working fluid in the energy storage container, and realizes precise temperature control of the energy storage battery.

[0049] 5. Since the split structure design of the condensing assembly and other assemblies is adopted, the original condensing assembly in the energy storage container is placed on the top of the energy storage container, which increases the power and performance of the heat pump system, and the saved space can provide the built-in condition of the energy storage water tank in the energy storage container, increase the heat exchange area between the heat pump system and the external environment, and can improve the power of the heat pump system, and adapt to the energy storage container with higher heat dissipation demand.

[0050] In summary, functionally, the cooling liquid of the application is directly circulated in the energy storage water tank, and is not indirectly exchanged through a secondary loop in the energy storage water tank; structurally, the application uses the saved space to arrange the energy storage water tank inside the energy storage cabinet, which has better safety performance and is less affected by the external environment (sand, rain, snow, etc.); in terms of cost, the energy storage water tank has the ability of heat storage and cold storage, and can provide accurate temperature control according to the actual demand of the system; in terms of controllable temperature range, the application can adjust the power of refrigeration or heating according to the temperature of the battery cell group, and provide timely variable temperature conditions for the battery cell group.

[0051] Although some specific embodiments of the application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A split type energy storage container temperature control system with cold and heat storage functions, characterized in that, The heat pump system comprises a refrigeration circuit and a liquid cooling loop connected by a heat exchanger; The temperature control system further comprises a bypass circuit provided on the liquid cooling loop, and the bypass circuit is provided with an energy storage water tank with a pre-cooling / heat storage function.

2. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 1, characterized in that, The liquid cooling loop comprises a water pump, a first electromagnetic valve and a second electromagnetic valve arranged in sequence between the water pump and the heat exchanger, a pipeline heater, a third electromagnetic valve arranged in sequence at the rear end of the heat exchanger, and a set of liquid cooling heat exchange plates attached to the battery cell group.

3. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 2, characterized in that, The bypass circuit comprises a fourth electromagnetic valve and the energy storage water tank arranged in parallel on the first electromagnetic valve.

4. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 3, characterized in that, The bypass circuit further comprises a fifth electromagnetic valve arranged at the front end of the water pump and the front end of the third electromagnetic valve.

5. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 2, characterized in that, The controller is used to control the operation of the refrigeration circuit or the pipeline heater according to the battery working environment, so as to pre-store cold or heat in the energy storage water tank through the bypass circuit.

6. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 5, characterized in that, The controller is used to control the power of the refrigeration circuit or the pipeline heater according to the battery working environment, so as to pre-store cold or heat of appropriate temperature in the energy storage water tank through the bypass circuit.

7. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 1, characterized in that, The first condensing assembly of the refrigeration circuit is arranged at the top of the energy storage container, and the components of the heat pump system other than the first condensing assembly are arranged inside the energy storage container.

8. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 7, characterized in that, The energy storage water tank is arranged above the components of the refrigeration circuit in the energy storage container other than the first condensing assembly.

9. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 7, characterized in that, The top of the energy storage container is provided with a plurality of air inlet channels and dustproof nets, a first fan of the first condensing assembly is arranged on the side of the upper part of the energy storage container, a first radiator of the first condensing assembly is arranged on the inner side of the upper part of the energy storage container, and an exhaust fan is arranged between the first fan and the radiator.

10. The split-type thermal energy storage container temperature control system with cold and heat accumulation functions according to claim 1, characterized in that, The heat pump system further comprises a natural liquid cooling loop arranged between the front end of the second electromagnetic valve and the rear end of the heat exchanger, and a second condensing assembly of the natural liquid cooling loop is arranged at the top of the energy storage container.

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