Full liquid cooling energy storage system

Abstract

The utility model discloses a full-liquid-cooling energy storage system. The full-liquid-cooling energy storage system comprises a battery module; a PCS module; the first heat exchange system is connected with the PCS system and is used for carrying out heat exchange on the PCS module; the first temperature sensor is used for acquiring the environment temperature of the battery module; the first heat exchange system is connected with the battery module and is used for heating the battery module at a low temperature according to the environment temperature of the battery module. According to the utility model, the battery is effectively cooled by using the environment temperature at low temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid-cooled energy storage, and particularly relates to a full liquid-cooled energy storage system. Background Technique

[0002] New energy is the key to achieving the dual-carbon goal. However, the charge and discharge efficiency, capacity, safety, and lifespan of batteries are greatly affected by temperature. Excessive, too low temperature, or a large temperature difference between battery packs will directly affect their performance. Therefore, it is necessary to make the batteries operate at an appropriate temperature so as to fully exert the performance of the batteries.

[0003] Currently, for battery systems and liquid-cooled PCS (Power Conversion System), the common solution is to use liquid cooling for cooling, but the liquid-cooled PCS system and the liquid-cooled battery system operate independently. However, in this way, the liquid-cooled battery system usually requires an independent PTC (Thermal Management System) for heating under low-temperature conditions, and it is impossible to effectively dissipate heat from the battery using the ambient temperature at low temperatures.

[0004] In view of the above problems, a full liquid-cooled energy storage system is proposed. Summary of the Invention

[0005] According to one aspect of the present application, a full liquid-cooled energy storage system is provided, which can effectively dissipate heat from the battery using the ambient temperature at low temperatures.

[0006] A full liquid-cooled energy storage system, characterized by comprising:

[0007] A battery module;

[0008] A PCS module;

[0009] A first heat exchange system, which is connected to the PCS module and used for heat exchange of the PCS module;

[0010] A first temperature sensor, used to obtain the ambient temperature where the battery module is located;

[0011] The first heat exchange system is connected to the battery module and heats the battery module at low temperatures according to the ambient temperature where the battery module is located.

[0012] Furthermore, it further includes a second heat exchange system, which is connected to the battery module and used for heat exchange of the battery module;

[0013] The second heat exchange system includes a plate heat exchanger. One side of the plate heat exchanger is connected to the battery module to form a first heat exchange loop. A first three-way ball valve, a first power pump, and a second temperature sensor are arranged on the first heat exchange loop. The third branch of the first three-way ball valve is connected to the first heat exchange system. The second temperature sensor is located on the pipeline of the first heat exchange loop before heat exchange with the battery module.

[0014] The other side of the plate heat exchanger is sequentially connected with a compressor, a first condenser, and a throttling device to form a second heat exchange loop.

[0015] Furthermore, the first heat exchange system and the heat exchange component of the PCS module form a third heat exchange loop through a pipeline. A second power pump, a second condenser, a third temperature sensor, and a second three-way ball valve are arranged on the pipeline of the third heat exchange loop.

[0016] The third branch of the second three-way ball valve is connected to the heat exchange end of the battery module.

[0017] Furthermore, the throttling device is an expansion valve.

[0018] Furthermore, the first condenser and the second condenser share a fan.

[0019] The beneficial effects that can be produced by this application include:

[0020] For a fully liquid-cooled energy storage system provided by this application, by obtaining the ambient temperature of the battery module, when the temperature is too low, during the power conversion of the PCS module, the heat generated is guided to the battery module through the liquid medium, and the heat of the PCS module's heat exchange is used to heat the battery module, avoiding the heating under low-temperature conditions by an independent PTC (thermal management system). Description of the Drawings

[0021] Figure 1 It is a connection schematic diagram of a fully liquid-cooled energy storage system of this application;

[0022] Figure 2 It is a control schematic diagram of a fully liquid-cooled energy storage system of this application;

[0023] In the figure: 1. Battery module; 2. PCS module; 3. First temperature sensor; 4. Plate heat exchanger; 5. First three-way ball valve; 6. First power pump; 7. Second temperature sensor; 8. Compressor; 9. First condenser; 10. Throttling device; 11. Second power pump; 12. Second condenser; 13. Third temperature sensor; 14. Second three-way ball valve. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figure 1-2 , the present utility model provides a fully liquid-cooled energy storage system, which is characterized by including:

[0026] Battery module 1;

[0027] PCS module 2;

[0028] The first heat exchange system, which is connected to the PCS module 2 and is used for heat exchange of the PCS module 2;

[0029] The first temperature sensor 3, which is used to obtain the ambient temperature where the battery module 1 is located;

[0030] The first heat exchange system is connected to the battery module 1 and heats the battery module 1 at low temperature according to the ambient temperature where the battery module 1 is located.

[0031] Specifically, the PCS module 2 is a module responsible for power conversion, distribution, or a certain specific power processing. It works in cooperation with the battery module 1 to ensure the stable supply and efficient utilization of electric energy. Generally, during the heat exchange process between the battery module and the PCS module, the two systems operate independently. During the operation of the battery, too low ambient temperature will affect the working efficiency of the battery. Therefore, by obtaining the ambient temperature where the battery module is located, when the temperature is too low and the PCS module is performing power conversion, the generated heat is captured and directed to the battery module, and the heat from the heat exchange of the PCS module is used to heat the battery module, avoiding heating under low-temperature conditions by an independent PTC (thermal management system).

[0032] It further includes a second heat exchange system, which is connected to the battery module 1 and is used for heat exchange of the battery module 1;

[0033] The second heat exchange system includes a plate heat exchanger 4. One side of the plate heat exchanger 4 is connected to the battery module 1 to form a first heat exchange loop. A first three-way ball valve 5, a first power pump 6, and a second temperature sensor 7 are arranged on the first heat exchange loop. The third branch of the first three-way ball valve 5 is connected to the first heat exchange system, and the second temperature sensor 7 is located on the pipeline of the first heat exchange loop before heat exchange of the battery module 1;

[0034] On the other side of the plate heat exchanger 4, there are successively connected a compressor 8, a first condenser 9, and a throttling device 10 to form a second heat exchange circuit.

[0035] Specifically, the second heat exchange system exchanges heat with the battery module 1 to ensure its operation within an appropriate temperature range. One side of the plate heat exchanger 4 is connected to the battery module 1 to form a first heat exchange circuit, receiving heat from the battery module and sending the cooled medium back to the battery module for heat exchange.

[0036] Among them, the plate heat exchanger has high-efficient heat exchange capacity and a compact structure, which is suitable for battery thermal management.

[0037] The first three-way ball valve has three connection ports, two of which are connected to the first heat exchange circuit, and the third branch is connected to the first heat exchange system. By adjusting the position of the three-way ball valve, the flow path of the medium can be controlled to achieve the switching between different working modes. The first power pump 6 provides power for the fluid to circulate in the system to ensure the smooth progress of the heat exchange process. The second temperature sensor is located in the first heat exchange circuit, on the pipeline before the battery module 1 exchanges heat, and is used to monitor the temperature of the medium entering the battery module in real time. This temperature information is crucial for controlling the operation of the entire system because it reflects the current heat dissipation requirements and efficiency of the battery module. The compressor 8 compresses the fluid to increase its temperature and pressure, preparing for the subsequent heat release process in the condenser. The first condenser 9 receives the high-temperature and high-pressure fluid from the compressor and dissipates the heat in it to the environment through heat exchange, cooling and condensing the fluid into a liquid state. The throttling device 10 throttles and reduces the pressure of the condensed fluid, usually a small hole or an expansion valve, to reduce its temperature and pressure, so that it is in an appropriate state before entering the plate heat exchanger 4, preparing for absorbing heat again when entering the plate heat exchanger 4.

[0038] During operation, the heat generated by the battery module 1 is transferred to the plate heat exchanger 4 through the medium in the first heat exchange circuit. Then, these heats are raised in temperature by the compressor 8 in the second heat exchange circuit and dissipated to the environment in the first condenser 9. The medium after being depressurized and cooled by the throttling device 10 enters the plate heat exchanger 4 again to exchange heat with the battery module 1, completing a cycle.

[0039] When heating is required under low-temperature conditions, it can be achieved by adjusting the valve position of the first three-way ball valve 5 to connect with the first heat exchange system.

[0040] The first heat exchange system and the heat exchange component of the PCS module 2 are connected through a third heat exchange circuit of the pipeline. On the pipeline of the third heat exchange circuit, there are provided a second power pump 11, a second condenser 12, a third temperature sensor 13, and a second three-way ball valve 14;

[0041] The third branch of the second three-way ball valve 14 is connected to the heat exchange end of the battery module 1.

[0042] Specifically, the second power pump 11 is responsible for driving the medium, such as the coolant, to circulate in the third heat exchange circuit, ensuring that heat can smoothly transfer from the PCS module to the second condenser and may further transfer to the battery module. The second condenser 12, as a heat exchanger, dissipates the heat from the PCS module to the environment to cool the medium. This helps to maintain the PCS module operating within its optimal working temperature range. The third temperature sensor 13 is located on the third heat exchange circuit for real-time monitoring of the medium temperature. This temperature information is crucial for controlling the thermal management strategy of the entire system. The second three-way ball valve 14 has three connection ports, two of which are connected to the main path of the third heat exchange circuit and the other is connected to the heat exchange end of the battery module 1. By adjusting the position of the three-way ball valve, the flow path of the medium can be controlled to achieve the switching between different working modes.

[0043] The second three-way ball valve 14 controls the flow direction of the medium. Under normal circumstances, the cooling medium may directly return to the PCS module 2 for re-circulation. However, in specific situations (such as when heating the battery module 1 is required), the second three-way ball valve 14 can adjust its valve position to allow part or all of the liquid path medium to flow through the third branch to the heat exchange end of the battery module 1 to heat the battery module.

[0044] The throttling device 10 is an expansion valve.

[0045] Specifically, the main function of the expansion valve is to throttle the medium. After the medium-temperature and high-pressure liquid refrigerant passes through its throttle orifice, it is transformed into a low-temperature and low-pressure wet steam or mist-like refrigerant. This transformation process creates conditions for the evaporation of the refrigerant, and then the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect.

[0046] The first condenser 9 and the second condenser 12 share a fan.

[0047] It is worth noting that this application uses an electric three-way ball valve for system connection to achieve flow switching under different working conditions. The control method under different heat dissipation and heating conditions is as follows:

[0048] (1) At the initial moment, obtain the ambient temperature T1 through the first temperature sensor;

[0049] (2) When in the range of T1 > 15°C, in the second three-way ball valve, A is open and B is closed, and in the first three-way ball valve, C is open and D is closed. The battery module uses compression refrigeration for liquid cooling heat dissipation, and the PCS module uses forced air cooling for heat dissipation;

[0050] (3) When in the range of 0°C < T1 < 15°C, the second three-way ball valve has A communicating with B, and the first three-way ball valve has C closed and D communicating. The battery module and the PCS module are cooled by forced air cooling to reduce the overall energy consumption during use;

[0051] (4) When in the range of T1 < 0°C, the second three-way ball valve has A communicating and B closed, and the first three-way ball valve has C closed and D closed. Let the PCS act as a heater to raise the temperature of the liquid path, and detect the third temperature sensor T3. When T3 > 10°C, the second three-way ball valve has A communicating with B, and the first three-way ball valve has C closed and D communicating. The battery module and the PCS module are cooled by forced air cooling.

[0052] As described above, these are only several embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, making some changes or modifications using the disclosed technical content is equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A fully liquid-cooled energy storage system, characterized in that, Comprising: Battery module (1); PCS module (2); A first heat exchange system, which is connected to the PCS module (2) and is used for heat exchange of the PCS module (2); A first temperature sensor (3), which is used to obtain the ambient temperature of the battery module (1); The first heat exchange system is connected to the battery module (1) and heats the battery module (1) at low temperature according to the ambient temperature of the battery module (1).

2. The all-liquid-cooled energy storage system according to claim 1, wherein It further comprises a second heat exchange system, which is connected to the battery module (1) and is used for heat exchange of the battery module (1); The second heat exchange system includes a plate heat exchanger (4). One side of the plate heat exchanger (4) is connected to the battery module (1) to form a first heat exchange loop. A first three-way ball valve (5), a first power pump (6) and a second temperature sensor (7) are arranged on the first heat exchange loop. The third branch of the first three-way ball valve (5) is connected to the first heat exchange system, and the second temperature sensor (7) is located on the pipeline of the first heat exchange loop before heat exchange of the battery module (1); The other side of the plate heat exchanger (4) is sequentially connected with a compressor (8), a first condenser (9) and a throttling device (10) to form a second heat exchange loop.

3. The all-liquid-cooled energy storage system according to claim 2, wherein, The heat exchange component of the first heat exchange system and the PCS module (2) form a third heat exchange loop through a pipeline. A second power pump (11), a second condenser (12), a third temperature sensor (13) and a second three-way ball valve (14) are arranged on the pipeline of the third heat exchange loop; The third branch of the second three-way ball valve (14) is connected to the heat exchange end of the battery module (1).

4. The all-liquid-cooled energy storage system according to claim 2, wherein The throttling device (10) is an expansion valve.

5. The all-liquid-cooled energy storage system according to claim 3, wherein, The first condenser (9) and the second condenser (12) share a fan.

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