Energy storage system and new energy system

Abstract

The utility model discloses an energy storage system and a new energy system, the energy storage system comprises a battery pack, an energy storage converter and a temperature control system, the energy storage converter is electrically connected with the battery pack, the temperature control system comprises a first heat exchange loop, a second heat exchange loop, a bypass branch, a radiator, a first switching device and a second switching device, the first heat exchange loop exchanges heat with the battery pack, and the second heat exchange loop exchanges heat with the energy storage converter; the second heat exchange loop comprises a first sub-circuit and a second sub-circuit which are communicated, the energy storage converter is arranged on the first sub-circuit, the radiator is arranged on the second sub-circuit, the bypass branch is connected with the second sub-circuit in parallel, and the second switching device is connected with the bypass branch, the second sub-circuit and the first sub-circuit. And the second switching device is used for controlling the proportion of the heat exchange medium flowing through the second sub-path and the bypass branch. The energy storage system provided by the utility model can accurately regulate and control the temperature of the battery pack and the energy storage converter so as to improve the energy efficiency of the energy storage system.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and particularly relates to an energy storage system and a new energy system. Background Art

[0002] With the continuous development of new energy, energy storage systems are widely used in multiple fields, such as photovoltaic and electric vehicles. An energy storage system includes a battery pack and an energy storage inverter. With the continuous improvement of the energy density of the energy storage system and in order to improve the energy efficiency of the energy storage system, there is a need for thermal management of the battery pack and the energy storage inverter in the energy storage system. However, the existing energy storage system cannot accurately control the temperature of the battery pack and the energy storage inverter, resulting in low energy efficiency of the energy storage system. Summary of the Utility Model

[0003] The main object of the utility model is to propose an energy storage system and a new energy system, aiming to accurately control the temperature of the battery pack and the energy storage inverter and improve the energy efficiency of the energy storage system.

[0004] To achieve the above object, the energy storage system proposed by the utility model includes a battery pack, an energy storage inverter and a temperature control system. The energy storage inverter is electrically connected to the battery pack, wherein:

[0005] The temperature control system includes a first heat exchange circuit, a second heat exchange circuit, a bypass branch, a radiator, a first switching device and a second switching device. The first heat exchange circuit is arranged for heat exchange with the battery pack, and the second heat exchange circuit is arranged for heat exchange with the energy storage inverter; The first switching device connects the inlet and outlet of the first heat exchange circuit and the inlet and outlet of the second heat exchange circuit, and the first switching device is further used to control the connection or disconnection between the first heat exchange circuit and the second heat exchange circuit;

[0006] The second heat exchange circuit includes a first sub-circuit and a second sub-circuit connected in series. The energy storage inverter is arranged in the first sub-circuit, and the radiator is arranged in the second sub-circuit. The bypass branch is connected in parallel with the second sub-circuit. The second switching device connects the bypass branch, the second sub-circuit and the first sub-circuit, and the second switching device is used to control the proportion of the heat exchange medium flowing through the second sub-circuit and the bypass branch.

[0007] In an embodiment, the second sub-circuit is connected in series with the first sub-circuit. The energy storage inverter is upstream of the radiator in the second heat exchange circuit, and the second switching device is connected to the outlet of the bypass branch and the outlet of the second sub-circuit.

[0008] In one embodiment, the temperature control system further includes a pipe joint. A first interface of the pipe joint communicates with the first sub-circuit, a second interface of the pipe joint communicates with an inlet of the second sub-circuit, and a third interface of the pipe joint communicates with an inlet of the bypass branch.

[0009] In one embodiment, the energy storage system has a first working mode. When the energy storage system is in the first working mode, the temperature control system is configured to control the radiator to work, control the first switching device to connect the first heat exchange circuit and the second heat exchange circuit in series. The heat transfer medium flows through the battery pack and the energy storage converter in sequence, then is split to the radiator and the bypass branch, and the mixing ratio is adjusted by the second switching device, and then flows back to the first heat exchange circuit for circulating flow.

[0010] In one embodiment, the temperature control system further includes a heating device. The heating device is arranged in the first heat exchange circuit and is configured to heat the heat transfer medium flowing through the battery pack.

[0011] In one embodiment, the energy storage system has a second working mode. When the energy storage system enters the second working mode, the temperature control system is configured to control the heating device to work and the radiator not to work, control the first switching device to connect the first heat exchange circuit and the second heat exchange circuit in series. The heat transfer medium flows through the heating device, then flows through the battery pack, the energy storage converter, the bypass branch and the second switching device in sequence, and then flows back to the first heat exchange circuit for circulating flow.

[0012] In one embodiment, the energy storage system has a third working mode. When the energy storage system enters the third working mode, the temperature control system is configured to control the heating device to work and the radiator not to work, control the first switching device to disconnect the first heat exchange circuit and the second heat exchange circuit. The heat transfer medium flows through the heating device, then flows through the battery pack, and circulates along the first heat exchange circuit.

[0013] In one embodiment, the energy storage system has a fourth working mode. When the energy storage system enters the fourth working mode, the temperature control system is configured to control the radiator not to work, control the first switching device to disconnect the first heat exchange circuit and the second heat exchange circuit. The heat transfer medium flows through the battery pack and circulates along the first heat exchange circuit.

[0014] In one embodiment, the temperature control system further includes a second pump body. The second pump body is arranged on the second heat exchange circuit between the inlet of the second heat exchange circuit and the energy storage converter;

[0015] And / or, the temperature control system further includes a closed expansion tank, and the closed expansion tank is arranged on the second heat exchange loop.

[0016] In one embodiment, the first switching device is a four-way valve; and / or, the second switching device is a proportional three-way valve;

[0017] And / or, the radiator is an air-cooled condenser.

[0018] In one embodiment, the temperature control system further includes a third heat exchange loop, and the third heat exchange loop includes a compressor, a first heat exchange device, a first throttle valve, and a second heat exchange device connected in sequence. The first heat exchange device communicates with the second heat exchange loop between the energy storage converter and the inlet of the radiator, and the second heat exchange device communicates with the first heat exchange loop.

[0019] In one embodiment, the first heat exchange device has a first heat exchange channel and a second heat exchange channel arranged for heat exchange with each other, and the second heat exchange device has a third heat exchange channel and a fourth heat exchange channel arranged for heat exchange with each other. The compressor, the first heat exchange channel, the first throttle valve, and the third heat exchange channel are connected in sequence to form a circulation loop, and the second heat exchange channel is connected in series on the second sub-path between the energy storage converter and the radiator.

[0020] In one embodiment, the temperature control system further includes a first pump body, and the first pump body is arranged on the first heat exchange loop between the battery pack and the inlet of the first heat exchange loop. The fourth heat exchange channel is connected in series on the first heat exchange loop between the battery pack and the outlet of the first pump body.

[0021] In one embodiment, the energy storage system has a fifth working mode. When the energy storage system enters the fifth working mode, the temperature control system is configured to control the radiator to work, control the first switching device to disconnect the first heat exchange loop from the second heat exchange loop, and control the refrigerant discharged by the compressor to circulate in the third heat exchange loop. The refrigerant flows through the first heat exchange channel to condense and release heat, and then flows through the third heat exchange channel to evaporate and absorb heat;

[0022] The heat exchange medium circulates in the first heat exchange loop, and the heat exchange medium flows through the fourth heat exchange channel and absorbs the cold released by the refrigerant flowing through the third heat exchange channel to cool down, and then flows through the battery pack;

[0023] The heat exchange medium circulates in the second heat exchange loop, and the heat exchange medium flows through the energy storage converter to absorb heat and increase in temperature, then flows through the second heat exchange channel and absorbs the heat released by the refrigerant flowing through the first heat exchange channel to increase in temperature, and then flows through the radiator.

[0024] In one embodiment, the temperature control system further includes a dehumidifying device, which includes a second throttle valve and a dehumidifier connected in series through a pipeline, and the dehumidifying device is connected in parallel with the first throttle valve and the second heat exchange device.

[0025] The present utility model also provides a new energy system, which includes the energy storage system as described above.

[0026] The energy storage system of the present utility model includes a battery pack, an energy storage inverter and a temperature control system. The energy storage inverter is electrically connected to the battery pack. The temperature control system includes a first heat exchange circuit, a second heat exchange circuit, a bypass branch, a radiator, a first switching device and a second switching device. The first heat exchange circuit is arranged for heat exchange with the battery pack to cool down or heat up the battery pack; the energy storage inverter is arranged for heat exchange with the second heat exchange circuit. The second heat exchange circuit includes a first sub-circuit and a second sub-circuit that are communicated. The energy storage inverter is arranged in the first sub-circuit, and the radiator is arranged in the second sub-circuit to cool down the energy storage inverter; the first switching device is connected to the inlet and outlet of the first heat exchange circuit and the inlet and outlet of the second heat exchange circuit, and the first switching device is also used to control the connection or disconnection of the first heat exchange circuit and the second heat exchange circuit, so that the first heat exchange circuit and the second heat exchange circuit can be respectively self-connected or interconnected, so that the energy storage system can have multiple working modes; the bypass branch is connected in parallel with the second sub-circuit, and the second switching device is connected to the bypass branch, the second sub-circuit and the first sub-circuit. The second switching device is used to control the proportion of the heat exchange medium flowing through the second sub-circuit and the bypass branch. The second switching device cooperates with the radiator, so as to be able to adjust and distribute the heat of the heat exchange medium in the second sub-circuit and the bypass branch, that is, to accurately adjust the heat of the heat exchange medium flowing out of the second heat exchange circuit. The heat exchange media with different heats flow through the battery pack and / or the energy storage inverter through the first switching device for heat exchange, so that the energy storage system can have multiple working modes. In this way, the temperature of the battery pack and the energy storage inverter can be accurately controlled, which is beneficial to improving the energy efficiency of the energy storage system, and the structure of the temperature system is simple, which is beneficial to reducing the manufacturing cost of the energy storage system. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic structural diagram of an embodiment of the energy storage system provided by the present utility model;

[0029] Figure 2 ForFigure 1 Schematic diagram of the energy storage system in the first working mode;

[0030] Figure 3 is Figure 1 Schematic diagram of the energy storage system in the second working mode;

[0031] Figure 4 is Figure 1 Schematic diagram of the energy storage system in the third working mode;

[0032] Figure 5 is Figure 1 Schematic diagram of the energy storage system in the fourth working mode;

[0033] Figure 6 is Figure 1 Schematic diagram of the energy storage system in the fifth working mode;

[0034] Figure 7 is Figure 1 Schematic diagram of the energy storage system in the sixth working mode;

[0035] Figure 8 is Figure 1 Schematic diagram of the energy storage system in the seventh working mode.

[0036] Explanation of the reference numerals in the drawings:

[0037] 10. Energy storage system; 100. Battery pack; 200. Energy storage converter; 300. Temperature control system; 301. First switching device; 302. Second switching device; 303. First pump; 304. Second pump; 305. Pipe joint; 306. Closed expansion tank; 310. First heat exchange circuit; 320. Second heat exchange circuit; 321. First sub-circuit; 322. Second sub-circuit; 330. Bypass branch; 340. Radiator; 350. Heating device; 360. Third heat exchange circuit; 361. Compressor; 362. First heat exchange device; 363. First throttle valve; 364. Second heat exchange device; 370. Dehumidification device; 371. Second throttle valve; 372. Dehumidifier.

[0038] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0042] The present utility model provides an energy storage system that can accurately control the temperatures of a battery pack and an energy storage converter, and the energy storage system has high energy efficiency.

[0043] Please refer to Figure 1, in an embodiment of the present utility model, the energy storage system 10 includes a battery pack 100, an energy storage inverter 200, and a temperature control system 300. The energy storage inverter 200 is electrically connected to the battery pack 100. The temperature control system 300 includes a first heat exchange loop 310, a second heat exchange loop 320, a bypass branch 330, a radiator 340, a first switching device 301, and a second switching device 302. The first heat exchange loop 310 is arranged for heat exchange with the battery pack 100, and the second heat exchange loop 320 is arranged for heat exchange with the energy storage inverter 200. The first switching device 301 connects the inlet and outlet of the first heat exchange loop 310 and the inlet and outlet of the second heat exchange loop 320, and the first switching device 301 is further configured to control the connection or disconnection between the first heat exchange loop 310 and the second heat exchange loop 320. The second heat exchange loop 320 includes a first sub-loop 321 and a second sub-loop 322 that are connected in series. The energy storage inverter 200 is arranged in the first sub-loop 321, and the radiator 340 is arranged in the second sub-loop 322. The bypass branch 330 is connected in parallel with the second sub-loop 322. The second switching device 302 connects the bypass branch 330, the second sub-loop 322, and the first sub-loop 321, and the second switching device 302 is configured to control the proportion of the heat exchange medium flowing through the second sub-loop 322 and the bypass branch 330.

[0044] It can be understood that the battery pack 100 is used to store electric energy and release the stored electric energy when needed. Heat is generated during the process of storing and releasing electric energy by the battery pack 100. The battery pack 100 can be defined as a heat generating device in the energy storage system 10. The first heat exchange loop 310 is arranged for heat exchange with the battery pack 100. The first heat exchange loop 310 and the battery pack 100 can form heat exchange by thermal conduction and adhesion, or the battery pack 100 can be connected to the first heat exchange loop 310 through a heat exchange channel to form heat exchange. The energy storage system 10 cools or heats the battery pack 100 through the first heat exchange loop 310. Specifically, in this embodiment, the first heat conducting plate in the first heat exchange loop 310 is arranged in thermal conduction and adhesion with the battery pack 100, and the heat exchange medium flows through the first heat conducting plate to exchange heat with the battery pack 100, so that the battery pack 100 operates under suitable temperature conditions, improving the reliability of the energy storage system 10.

[0045] The energy storage converter 200 (power conversion system, PCS) can control the charging and discharging processes of the battery pack 100 and perform AC-DC conversion. Heat is also generated during the operation of the energy storage converter 200. Therefore, the energy storage converter 200 can also be defined as a heat-generating device in the energy storage system 10. Correspondingly, the second heat exchange loop 320 is arranged for heat exchange with the energy storage converter 200. The second heat exchange loop 320 and the energy storage converter 200 can form heat exchange by thermal conduction bonding, or the energy storage converter 200 can communicate with the second heat exchange loop 320 through a heat exchange channel to form heat exchange. The energy storage system 10 dissipates heat from the energy storage converter 200 through the second heat exchange loop 320. Specifically, in this embodiment, the second heat conduction plate in the second heat exchange loop 320 is arranged in thermal conduction bonding with the energy storage converter 200, and the heat exchange medium flows through the second heat conduction plate to exchange heat with the energy storage converter 200, enabling the energy storage converter 200 to operate under suitable temperature conditions and improving the reliability of the energy storage system 10.

[0046] Furthermore, the first switching device 301 is connected to the inlet and outlet of the first heat exchange loop 310 and the inlet and outlet of the second heat exchange loop 320. The first switching device 301 is also used to control the connection or disconnection between the first heat exchange loop 310 and the second heat exchange loop 320. With such a setting, the first heat exchange loop 310 and the second heat exchange loop 320 have multiple connection modes. For example, when the inlet and outlet of the first heat exchange loop 310 are connected through the first switching device 301, the first heat exchange loop 310 is self-connected to form a circulation loop, and the heat exchange medium can circulate in the first heat exchange loop 310. When the inlet and outlet of the second heat exchange loop 320 are connected through the first switching device 301, the second heat exchange loop 320 is self-connected to form a circulation loop, and the heat exchange medium can circulate in the second heat exchange loop 320. When the first heat exchange loop 310 and the second heat exchange loop 320 are disconnected through the first switching device 301, the first heat exchange loop 310 and the second heat exchange loop 320 can be self-connected respectively, so that the heat exchange medium can circulate in the first heat exchange loop 310 and the second heat exchange loop 320 respectively. When the first heat exchange loop 310 and the second heat exchange loop 320 are connected through the first switching device 301, the first heat exchange loop 310 and the second heat exchange loop 320 can be connected in series to form a circulation loop, and the heat exchange medium flows through the first heat exchange loop 310 and the second heat exchange loop 320 in sequence for circulation. It can be seen that by setting the first switching device 301, the first heat exchange loop 310 and the second heat exchange loop 320 have multiple connection modes, so that the energy storage system 10 can have multiple working modes. There will be a detailed introduction later, and it will not be elaborated here one by one. The specific structure of the first switching device 301 is not limited. It can be composed of multiple valve bodies or a single multi-way valve.

[0047] It can be understood that the radiator 340 is used to enable the heat exchange medium flowing through the second sub-circuit 322 to form heat exchange with the external air, so that the heat exchange medium is cooled by heat dissipation. The second heat exchange circuit 320 is arranged for heat exchange with the energy storage converter 200. The energy storage converter 200 is arranged in the first sub-circuit 321, and the radiator 340 is arranged in the second sub-circuit 322. The temperature of the heat exchange medium rises after dissipating heat from the energy storage converter 200. The high-temperature heat exchange medium flows through the radiator 340 to dissipate heat and cool down, and then circulates to the first heat exchange circuit 310 or the second heat exchange circuit 320. When specifically arranged, a fan can be arranged near the radiator 340, and the fan can be used to accelerate the flow rate of the air flowing through the radiator 340, thereby improving the heat dissipation performance of the radiator 340.

[0048] The second heat exchange circuit 320 includes a first sub-circuit 321 and a second sub-circuit 322 that are connected. The bypass branch 330 is connected in parallel with the second sub-circuit 322. The second switching device 302 connects the bypass branch 330, the second sub-circuit 322, and the first sub-circuit 321. The second switching device 302 is used to control the proportion of the heat exchange medium flowing through the second sub-circuit 322 and the bypass branch 330. The radiator 340 cools down the heat exchange medium flowing through the second sub-circuit 322. With such an arrangement, that is, the second switching device 302 can distribute the flow rate of the heat exchange medium flowing through the second sub-circuit 322 and the bypass branch 330 to accurately adjust the temperature of the heat exchange medium flowing out of the second switching device 302. The heat exchange medium with the accurately adjusted temperature passes through the first switching device 301 to flow through the battery pack 100 and / or the energy storage converter 200 for heat exchange, thereby realizing the accurate temperature control of the battery pack 100 and / or the energy storage converter 200, and thus improving the energy efficiency of the energy storage system 10. Among them, the second switching device 302 can be connected to the inlet of the bypass branch 330, that is, the second switching device 302 is located at the inlet of the bypass branch 330; or, the second switching device 302 is connected to the outlet of the bypass branch 330, that is, the second switching device 302 is located at the outlet of the bypass branch 330. The specific structure of the second switching device 302 is not limited. It can be composed of multiple valve bodies or can be a single multi-way valve.

[0049] The energy storage system 10 of the present utility model includes a battery pack 100, an energy storage inverter 200, and a temperature control system 300. The energy storage inverter 200 is electrically connected to the battery pack 100. The temperature control system 300 includes a first heat exchange circuit 310, a second heat exchange circuit 320, a bypass branch 330, a radiator 340, a first switching device 301, and a second switching device 302. The first heat exchange circuit 310 is arranged for heat exchange with the battery pack 100 to cool down or heat up the battery pack 100. The energy storage inverter 200 is arranged for heat exchange with the second heat exchange circuit 320. The second heat exchange circuit 320 includes a first sub-circuit 321 and a second sub-circuit 322 which are connected in communication. The energy storage inverter 200 is arranged in the first sub-circuit 321, and the radiator 340 is arranged in the second sub-circuit 322 to cool down the energy storage inverter 200. The first switching device 301 connects the inlet and outlet of the first heat exchange circuit 310 and the inlet and outlet of the second heat exchange circuit 320. The first switching device 301 is further used to control the connection or disconnection between the first heat exchange circuit 310 and the second heat exchange circuit 320, so that the first heat exchange circuit 310 and the second heat exchange circuit 320 can be respectively self-connected or interconnected, so that the energy storage system 10 can have multiple working modes. The bypass branch 330 is connected in parallel with the second sub-circuit 322. The second switching device 302 connects the bypass branch 330, the second sub-circuit 322, and the first sub-circuit 321. The second switching device 302 is used to control the proportion of the heat exchange medium flowing through the second sub-circuit 322 and the bypass branch 330. The second switching device 302 cooperates with the radiator 340 to adjust the heat of the heat exchange medium distributed to the second sub-circuit 322 and the bypass branch 330, that is, to accurately adjust the heat of the heat exchange medium flowing out of the second heat exchange circuit 320. The heat exchange medium with different heats flows through the battery pack 100 and / or the energy storage inverter 200 through the first switching device 301 for heat exchange, so that the energy storage system 10 can have multiple working modes. In this way, the temperatures of the battery pack 100 and the energy storage inverter 200 can be accurately controlled, which is beneficial to improving the energy efficiency of the energy storage system 10, and the structure of the temperature system is simple, which is beneficial to reducing the manufacturing cost of the energy storage system 10.

[0050] It should be noted that the arrows in the accompanying drawings of the specification indicate the flow directions of the heat exchange medium and the refrigerant.

[0051] Please refer to Figure 1 and Figure 2 In an embodiment, the second sub-circuit 322 is connected in series and communication with the first sub-circuit 321. The energy storage inverter 200 is located upstream of the radiator 340 in the second heat exchange circuit 320. The second switching device 302 is connected to the outlet of the bypass branch 330 and the outlet of the second sub-circuit 322.

[0052] It can be understood that the second sub-circuit 322 is connected in series with the first sub-circuit 321. The second sub-circuit 322 is located in the middle of the first sub-circuit 321, that is, the first sub-circuit 321 is divided into two sections, and the second sub-circuit 322 is connected in series between the two sections of the first sub-circuit 321. The energy storage converter 200 is located upstream of the radiator 340. The heat exchange medium first dissipates heat from the energy storage converter 200 in the second heat exchange loop 320, becomes a heat exchange medium at a higher temperature, and then flows through the radiator 340. The radiator 340 cools the heat exchange medium to become a heat exchange medium at a lower temperature. Then, the second switching device 302 controls the proportion of the heat exchange medium flowing through the second sub-circuit 322 and the bypass branch 330 to accurately control the temperature of the heat exchange medium discharged from the second switching device 302.

[0053] In addition, the second switching device 302 is connected to the outlet of the bypass branch 330 and the outlet of the second sub-circuit 322, that is, the second switching device 302 is located at the outlet of the bypass branch 330 and the outlet of the second sub-circuit 322. The second switching device 302 controls the mixing ratio of the heat exchange medium flowing out of the bypass branch 330 and the heat exchange medium flowing out of the second sub-circuit 322 to achieve accurate control of the temperature of the heat exchange medium flowing out of the second heat exchange loop 320. Arranging the second switching device 302 at the outlet of the bypass branch 330 and the outlet of the second sub-circuit 322 is beneficial to improving the accuracy of controlling the temperature of the mixed heat exchange medium.

[0054] In one embodiment, the temperature control system 300 further includes a pipe joint 305. The first interface of the pipe joint 305 is connected to the first sub-circuit 321, the second interface of the pipe joint 305 is connected to the inlet of the second sub-circuit 322, and the third interface of the pipe joint 305 is connected to the inlet of the bypass branch 330. It can be understood that the pipe joint 305 can be a multi-way joint. Specifically, in this solution, the pipe joint 305 is a three-way joint. Connecting the first sub-circuit 321, the inlet of the second sub-circuit 322, and the inlet of the bypass branch 330 respectively through the three-way joint is beneficial to simplifying the pipeline layout, reducing the use of pipeline connectors, and thus saving the installation space of the energy storage system 10.

[0055] Please refer to Figure 2 , in one embodiment, the energy storage system 10 has a first working mode. The temperature control system 300 is used to control the radiator 340 to work in the first working mode, control the first switching device 301 to connect the first heat exchange loop 310 and the second heat exchange loop 320 in series. The heat exchange medium flows through the battery pack 100 and the energy storage converter 200 in sequence, and then is split to the radiator 340 and the bypass branch 330, and the mixing ratio is adjusted by the second switching device 302, and then flows back to the first heat exchange loop 310 for circulating flow.

[0056] It can be understood that the energy storage system 10 is used to cool down the battery pack 100 and the energy storage converter 200 in the first working mode. In Figure 2 the schematic diagram of the energy storage system 10 operating in the first working mode as shown, the first heat exchange loop 310 and the second heat exchange loop 320 are connected in series to form a circulation loop. The heat exchange medium dissipates heat from the battery pack 100 in the first heat exchange loop 310, and then the heat exchange medium after heat exchange dissipates heat from the energy storage converter 200. The heat exchange medium after heat exchange is distributed to the second sub-loop 322 and the bypass branch 330 and then flows through the second switching device 302. The second switching device 302 adjusts the distribution ratio of the heat exchange medium. Among them, the radiator 340 on the second sub-loop 322 cools down the high-temperature heat exchange medium, and the temperature of the heat exchange medium flowing through the bypass branch 330 remains basically unchanged. The cooled heat exchange medium and the heat exchange medium with unchanged temperature adjust the mixing ratio through the second switching device 302, so that the temperature of the heat exchange medium flowing out of the second switching device 302 can be accurately controlled. The accurately temperature-controlled heat exchange medium then flows through the battery pack 100 through the first switching device 301 to achieve accurate regulation of the temperature of the battery pack 100. Because the working temperature of the energy storage converter 200 is relatively high (usually up to 50 °C to 60 °C), the heat exchange medium flowing out of the first heat exchange loop 310 can still form a cooling effect on the energy storage converter 200. As for the specific value of the mixing ratio of the heat exchange medium flowing out of the second sub-loop 322 and the bypass branch 330 adjusted by the second switching device 302, it is not limited here, and it is specifically adjusted according to the temperature of the battery pack 100 and the temperature of the heat exchange medium after being cooled by the radiator 340 to meet the requirements.

[0057] In an embodiment, the energy storage system 10 is used to enter the first working mode when the ambient temperature is in the normal temperature range. This normal temperature range can be 18 °C to 25 °C, or 13 °C to 28 °C, and it is not specifically limited here. The first working mode is applicable to scenarios with moderate ambient temperatures, such as spring and autumn, and temperate regions.

[0058] Please refer to Figure 3 , in an embodiment, the temperature control system 300 further includes a heating device 350. The heating device 350 is arranged in the first heat exchange loop 310, and the heating device 350 is used to heat the heat exchange medium flowing through the battery pack 100. It can be understood that the heating device 350 can heat the heat exchange medium in the first heat exchange loop 310. When the ambient temperature is low, the heated heat exchange medium flows through the battery pack 100 for heat exchange to achieve the function of heating and raising the temperature of the battery pack 100, ensuring the reliability of the operation of the battery pack 100. The specific structure of the heating device 350 is not limited, and the heating device 350 can be an electric heater.

[0059] Please refer toFigure 3 , in one embodiment, the energy storage system 10 has a second operating mode. When the energy storage system 10 enters the second operating mode, the temperature control system 300 is configured to control the heating device 350 to operate and the radiator 340 not to operate, and control the first switching device 301 to connect the first heat exchange loop 310 in series with the second heat exchange loop 320. The heat exchange medium flows through the heating device 350, then successively through the battery pack 100, the energy storage converter 200, the bypass branch 330, and the second switching device 302, and then returns to the first heat exchange loop 310 for circulating flow.

[0060] It can be understood that the energy storage system 10 is used to heat up the battery pack 100 in the second operating mode. In Figure 3 In the schematic diagram showing the energy storage system 10 operating in the second operating mode, the first heat exchange loop 310 and the second heat exchange loop 320 are connected in series to form a circulation loop. The heating device 350 operates, and the heat exchange medium is heated when flowing through the heating device 350 in the first heat exchange loop 310. The high-temperature heat exchange medium then heats the battery pack 100. After heat exchange, the heat exchange medium exchanges heat with the energy storage converter 200 and then heats up. Since the radiator 340 does not operate, the second switching device 302 controls the heat exchange medium to flow through the bypass branch 330 and controls the heat exchange medium not to flow through the second branch 322, so that the heat exchange medium can smoothly flow back to the first heat exchange loop 310 for circulating flow. In the second operating mode, after the heat generated by the heating device 350 and the heat generated by the energy storage converter 200 are absorbed by the heat exchange medium, the heat exchange medium flows through the bypass branch 330 and the second switching device 302 and then returns to the first heat exchange loop 310 to circulate and heat the battery pack 100. The waste heat generated by the energy storage converter 200 is fully utilized, and the heat exchange medium flows along the bypass branch 330, with less heat loss of the heat exchange medium. Thus, it is beneficial to improve the energy efficiency of the energy storage system 10.

[0061] In one embodiment, the energy storage system 10 is configured to enter the second operating mode when the ambient temperature is in a cold range. This cold range can be from -30 degrees Celsius to +13 degrees Celsius, or from -30 degrees Celsius to 0 degrees Celsius, and is not specifically limited herein. The second operating mode is applicable to scenarios with relatively low ambient temperatures, such as winter and cold regions.

[0062] Please refer to Figure 4, in one embodiment, the energy storage system 10 has a third operating mode. When the energy storage system 10 enters the third operating mode, the temperature control system 300 is configured to control the heating device 350 to operate and the radiator 340 not to operate, and control the first switching device 301 to disconnect the first heat exchange loop 310 from the second heat exchange loop 320. The heat exchange medium flows through the heating device 350, then through the battery pack 100, and circulates along the first heat exchange loop 310.

[0063] It can be understood that the energy storage system 10 is used to heat up the battery pack 100 in the third operating mode. Figure 4 In the schematic diagram showing the energy storage system 10 operating in the third operating mode, the first heat exchange loop 310 is disconnected from the second heat exchange loop 320. The inlet and outlet of the first heat exchange loop 310 are connected through the first switching device 301, and the first heat exchange loop 310 is self-connected to form a circulation loop. The heating device 350 operates, and the heat exchange medium flowing through the first heat exchange loop 310 is heated by the heating device 350. The high-temperature heat exchange medium then heats the battery pack 100, and the heat exchange medium after heat exchange then flows through the heating device 350 to be heated again, so as to achieve circulating flow in the first heat exchange loop 310. Moreover, since the radiator 340 does not operate, the heat exchange medium in the second heat exchange loop 320 does not flow, which is beneficial to reducing the energy loss of the energy storage system 10.

[0064] In one embodiment, the energy storage system 10 is configured to enter the third operating mode before the battery pack 100 is charged or discharged if the temperature of the battery pack 100 is less than a first preset value. The specific value of the first preset value is not limited, for example but not limited to: 8 degrees Celsius, 10 degrees Celsius, 13 degrees Celsius, 15 degrees Celsius, etc. The third operating mode is suitable for preheating the battery pack 100.

[0065] Please refer to Figure 5 , in one embodiment, the energy storage system 10 has a fourth operating mode. When the energy storage system 10 enters the fourth operating mode, the temperature control system 300 is configured to control the radiator 340 not to operate, and control the first switching device 301 to disconnect the first heat exchange loop 310 from the second heat exchange loop 320. The heat exchange medium flows through the battery pack 100 and circulates along the first heat exchange loop 310.

[0066] It can be understood that the energy storage system 10 is used to eliminate the temperature difference inside the battery pack 100 or between the battery pack 100 and the external environment in the fourth operating mode. Figure 5In the schematic diagram of the energy storage system 10 operating in the fourth working mode, the first heat exchange circuit 310 is disconnected from the second heat exchange circuit 320. The inlet and outlet of the first heat exchange circuit 310 are connected through the first switching device 301, and the first heat exchange circuit 310 is self-connected to form a circulation loop. The radiator 340 does not work, and the heat exchange medium in the second heat exchange circuit 320 does not flow. The heat exchange medium in the first heat exchange circuit 310 flows through the battery pack 100 for circulating flow. In this way, the self-circulation of the battery pack 100 is realized to ensure the temperature balance of the battery pack 100 and guarantee its performance and service life.

[0067] In an embodiment, the energy storage system 10 is configured to enter the fourth working mode if the temperature difference between the battery pack 100 and the ambient temperature is greater than a second preset value before the battery pack 100 is started. The specific value of this second preset value is not limited, for example but not limited to: 8 degrees Celsius, 10 degrees Celsius, 13 degrees Celsius, 15 degrees Celsius, etc. The fourth working mode is applicable to the self-circulation of the battery pack 100.

[0068] Please refer to Figure 1 , in an embodiment, the temperature control system 300 further includes a second pump body 304, and the second pump body 304 is disposed on the second heat exchange circuit 320 between the inlet of the second heat exchange circuit 320 and the energy storage converter 200. It can be understood that the second pump body 304 is used to drive the heat exchange medium in the second heat exchange circuit 320 to flow, so as to improve the smoothness of the heat exchange medium flow.

[0069] In the present application, there can be various types of heat exchange media, such as but not limited to; refrigerants such as water, water-containing ethanol, and silicone oil.

[0070] In an embodiment, the temperature control system 300 further includes a closed expansion tank 306, and the closed expansion tank 306 is disposed on the second heat exchange circuit 320. It can be understood that the closed expansion tank 306 includes a tank body and an internal rubber diaphragm. The tank body is divided into two parts: one part is the liquid part, which is connected to the heat exchange medium in the energy storage system 10; the other part is the gas part, which is usually filled with air or nitrogen and is used to provide elasticity. The closed expansion tank 306 is used to absorb and buffer the liquid volume change caused by temperature change, maintain the pressure stability of the energy storage system 10, avoid system failures caused by too high or too low pressure, and ensure the safe operation of the system.

[0071] In one embodiment, the first switching device 301 is a four-way valve. It can be understood that the four-way valve controls the self-connection, conduction, or disconnection of the first heat exchange circuit 310 and the second heat exchange circuit 320, so that the energy storage system 10 can have multiple working modes. The structure of the four-way valve is relatively simple and easy to manufacture. Applying it to the energy storage system 10 is beneficial to simplifying the structure of the energy storage system 10, saving development time and reducing manufacturing costs. At the same time, it is also beneficial to improve the operating stability of the energy storage system 10.

[0072] In one embodiment, the second switching device 302 is a proportional three-way valve. It can be understood that the proportional three-way valve can accurately control the proportion of the heat exchange medium flowing through the second branch 322 and the bypass branch 330. The structure of the proportional three-way valve is relatively simple and easy to manufacture. Applying it to the energy storage system 10 is beneficial to simplifying the structure of the energy storage system 10, saving development time and reducing manufacturing costs. At the same time, it is also beneficial to improve the control accuracy of the temperatures of the battery pack 100 and the energy storage converter 200, thereby improving the overall performance and energy efficiency of the energy storage system 10.

[0073] In one embodiment, the radiator 340 is an air-cooled condenser. It can be understood that the air-cooled condenser dissipates heat from the heat exchange medium. The air-cooled condenser uses air as the cooling medium and does not require water for cooling. This is beneficial to saving water resources, reducing operating costs, and environmental protection. Moreover, it can also improve the operating reliability of the energy storage system 10.

[0074] Please refer to Figure 6 , in one embodiment, the temperature control system 300 further includes a third heat exchange circuit 360. The third heat exchange circuit 360 includes a compressor 361, a first heat exchange device 362, a first throttle valve 363, and a second heat exchange device 364 connected in sequence. The first heat exchange device 362 is connected to the second heat exchange circuit 320 between the energy storage converter 200 and the inlet of the radiator 340, and the second heat exchange device 364 is connected to the first heat exchange circuit 310.

[0075] It can be understood that the compressor 361 is used to boost the pressure of the refrigerant in the third heat exchange circuit 360 to increase the heat exchange power of the third heat exchange circuit 360. The first throttle valve 363 plays a role in throttling and pressure reduction and regulating the flow rate. The first throttle component can be an electronic expansion valve. The second heat exchange device 364 is connected to the first heat exchange circuit 310, that is, the second heat exchange device 364 can exchange heat with the heat exchange medium flowing through the first heat exchange circuit 310.

[0076] Further, the refrigerant discharged by the compressor 361 can circulate in the third heat exchange circuit 360. When the compressor 361 in the third heat exchange circuit 360 operates, the refrigerant flows through the first heat exchange device 362 to condense and release heat, and then flows through the first throttling member and then through the second heat exchange device 364 to evaporate and absorb heat. The cold quantity released by the refrigerant flowing through the second heat exchange device 364 is exchanged with the heat exchange medium flowing through the first heat exchange circuit 310. The heat exchange medium in the first heat exchange circuit 310 absorbs the cold quantity released by the refrigerant and cools down. The cooled heat exchange medium can cool the battery pack 100, thereby improving the heat dissipation capacity of the energy storage system 10 for the battery pack 100. In addition, when the refrigerant flows through the second heat exchange device 364 to condense and release heat, the heat exchange medium in the first heat exchange circuit 310 can absorb the heat released by the refrigerant and heat up. The heated heat exchange medium can heat the battery pack 100, thereby improving the heating capacity of the energy storage system 10 for the battery pack 100. It can be seen that by setting the third heat exchange circuit 360, this solution is more likely to realize the functions of cooling and heating the battery pack 100.

[0077] In one embodiment, the first heat exchange device 362 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The second heat exchange device 364 has a third heat exchange channel and a fourth heat exchange channel that are arranged for heat exchange with each other. The compressor 361, the first heat exchange channel, the first throttle valve 363, and the third heat exchange channel are sequentially connected to form a circulation loop. The second heat exchange channel is connected in series to the second sub-path 322 between the energy storage converter 200 and the radiator 340.

[0078] It can be understood that the first heat exchange device 362 has a first heat exchange channel and a second heat exchange channel that are arranged for heat exchange with each other. The specific shapes of the first heat exchange channel and the second heat exchange channel are not limited, for example, but not limited to, straight tube shape, bent tube shape, spiral shape, etc. The first heat exchange device 362 includes, but is not limited to, a shell-and-tube heat exchanger, a plate heat exchanger, a spiral heat exchanger, a shell-and-tube heat exchanger, etc. The second heat exchange device 364 has a third heat exchange channel and a fourth heat exchange channel that are arranged for heat exchange with each other. The specific shapes of the third heat exchange channel and the fourth heat exchange channel are not limited, for example, but not limited to, straight tube shape, bent tube shape, spiral shape, etc. The second heat exchange device 364 includes, but is not limited to, a shell-and-tube heat exchanger, a plate heat exchanger, a spiral heat exchanger, a shell-and-tube heat exchanger, etc. Among them, the shell-and-tube heat exchanger includes an inner tube and an outer shell, and the outer shell is sleeved outside the inner tube. The inner tube forms the first heat exchange channel, and the second heat exchange channel is formed between the inner tube and the outer shell, or the inner tube forms the second heat exchange channel, and the first heat exchange channel is formed between the inner tube and the outer shell. Preferably, the inner tube forms the first heat exchange channel, and the second heat exchange channel is formed between the inner tube and the outer shell. The plate heat exchanger is composed of multiple plates, and there are gaps between the multiple plates. The first heat exchange channel and the second heat exchange channel can be formed through these gaps to enable heat transfer between two flowing media. The advantages of the plate heat exchanger include a compact design, efficient heat transfer, easy maintenance and cleaning.

[0079] Further, the second heat exchange channel is connected in series on the second sub-circuit 322 and is located between the energy storage converter 200 and the radiator 340, so that the heat exchange medium flowing through the second heat exchange channel can exchange heat with the refrigerant in the third heat exchange circuit 360 and then flow through the radiator 340 for heat dissipation. This is beneficial to increasing the heat release amount of the refrigerant flowing through the first heat exchange channel in the third heat exchange circuit 360, reducing the temperature of the refrigerant flowing into the third heat exchange channel, thereby increasing the heat exchange amount between the heat exchange medium in the first heat exchange circuit 310 and the refrigerant in the third heat exchange channel, making the temperature of the battery pack 100 flowing through lower, achieving efficient cooling of the battery pack 100, and improving the energy efficiency of the energy storage system 10.

[0080] In one embodiment, the temperature control system 300 further includes a first pump body 303. The first pump body 303 is disposed on the first heat exchange circuit 310 between the battery pack 100 and the inlet of the first heat exchange circuit 310. The fourth heat exchange channel is connected in series on the first heat exchange circuit 310 between the battery pack 100 and the outlet of the first pump body 303. It can be understood that the first pump body 303 is used to drive the heat exchange medium in the first heat exchange circuit 310 to flow, so as to improve the smoothness of the heat exchange medium flow. The fourth heat exchange channel is connected in series on the first heat exchange circuit 310 and is located between the battery pack 100 and the first pump body 303. The heat exchange medium pumped by the first pump body 303 can exchange heat with the refrigerant in the third heat exchange circuit 360 when flowing through the fourth heat exchange channel, and then exchange heat with the battery pack 100, thereby improving the energy utilization rate of the energy storage system 10, that is, improving the energy efficiency of the energy storage system 10.

[0081] Please refer to Figure 6 , in one embodiment, the energy storage system 10 has a fifth working mode. When the energy storage system 10 enters the fifth working mode, the temperature control system 300 is used to control the radiator 340 to work, control the first switching device 301 to disconnect the first heat exchange circuit 310 from the second heat exchange circuit 320, and control the refrigerant discharged by the compressor 361 to circulate in the third heat exchange circuit 360. The refrigerant flows through the first heat exchange channel to condense and release heat, and then flows through the third heat exchange channel to evaporate and absorb heat; the heat exchange medium circulates in the first heat exchange circuit 310, and the heat exchange medium flows through the fourth heat exchange channel and absorbs the cold released by the refrigerant flowing through the third heat exchange channel to cool down, and then flows through the battery pack 100; the heat exchange medium circulates in the second heat exchange circuit 320, and the heat exchange medium flows through the energy storage converter 200, and then flows through the second heat exchange channel and absorbs the heat released by the refrigerant flowing through the first heat exchange channel to heat up, and then flows through the radiator 340.

[0082] It can be understood that the energy storage system 10 is used to dissipate heat from the battery pack 100 and the energy storage converter 200 in the fifth working mode. In Figure 6 the schematic diagram of the energy storage system 10 operating in the fifth working mode shown, the first heat exchange circuit 310 is disconnected from the second heat exchange circuit 320. The inlet and outlet of the first heat exchange circuit 310 are connected through the first switching device 301, and the first heat exchange circuit 310 is self-connected to form a circulation loop. The inlet and outlet of the second heat exchange circuit 320 are connected through the first switching device 301, and the second heat exchange circuit 320 is self-connected to form a circulation loop.

[0083] The refrigerant in the third heat exchange circuit 360 circulates, and the heat exchange medium circulates in the first heat exchange circuit 310. Among them, the refrigerant flows through the first heat exchange channel to condense and release heat, and then flows through the third heat exchange channel to evaporate and absorb heat before returning to the compressor 361. When the refrigerant flows through the third heat exchange channel, it absorbs the heat of the heat exchange medium in the first heat exchange circuit 310, causing the heat exchange medium flowing towards the battery pack 100 to release heat and cool down. The cooled heat exchange medium then flows through the battery pack 100 for heat exchange to achieve heat dissipation and cooling of the battery pack 100.

[0084] The heat exchange medium circulates in the second heat exchange circuit 320. The second pump body 304 pumps the low-temperature heat exchange medium to the energy storage converter 200 to dissipate heat and cool down the energy storage converter 200. The heat exchange medium after heat exchange flows along the second sub-path 322. The heat exchange medium first flows through the second heat exchange channel and absorbs the heat released by the refrigerant flowing through the first heat exchange channel. Then the heat exchange medium flows through the radiator 340 on the second sub-path 322. The radiator 340 cools down the high-temperature heat exchange medium. The cooled heat exchange medium returns towards the second pump body 304 to form a circulation loop, thereby achieving heat dissipation and cooling of the energy storage converter 200. During this process, the second switching device 302 adjusts the heat exchange medium not to flow through the bypass branch 330, which is beneficial to shortening the flow path of the heat exchange medium, reducing the power consumption of the energy storage system 10, that is, improving the energy efficiency of the energy storage system 10.

[0085] In one embodiment, the energy storage system 10 is configured to enter the fifth operating mode when the ambient temperature is in a high temperature range. This high temperature range can be from 25 degrees Celsius to 60 degrees Celsius, or from 25 degrees Celsius to 55 degrees Celsius, and is not specifically limited herein. The fifth operating mode is applicable to scenarios where the ambient temperature is relatively high, such as in summer and tropical regions.

[0086] Please refer to Figure 6 and Figure 7 , in one embodiment, the temperature control system 300 further includes a dehumidifying device 370. The dehumidifying device 370 includes a second throttle valve 371 and a dehumidifier 372 connected in series through a pipeline. The dehumidifying device 370 is connected in parallel with the first throttle valve 363 and the second heat exchange device 364.

[0087] It can be understood that the dehumidifying device 370 is used to condense the moisture in the environment where the energy storage system 10 is located. When the refrigerant circulates in the path composed of the compressor 361, the first heat exchange device 362, the second throttle valve 371, and the dehumidifier 372, the temperature of the dehumidifier 372 will be relatively low, so that the water vapor in the environment where the dehumidifier 372 is located condenses into water to reduce the humidity of the environment where the energy storage system 10 is located. In addition, due to the relatively low temperature around the dehumidifier 372, it is also beneficial to keep the battery pack 100 in a relatively low temperature environment. In addition, in this solution, the dehumidifier 372 can be an evaporator.

[0088] Please refer to Figure 7 In one embodiment, the energy storage system 10 has a sixth working mode. When the energy storage system 10 enters the sixth working mode, the temperature control system 300 is configured to control the refrigerant discharged from the compressor 361 to flow through the first heat exchange channel of the first heat exchanger 362 to condense and release heat, then flow through the second throttle valve 371 for throttling and then through the dehumidifier 372 to evaporate and absorb heat, and then return to the compressor 361. It can be understood that by controlling the refrigerant discharged from the compressor 361 to evaporate and absorb heat when flowing through the dehumidifier 372, the dew point temperature of the air is reduced, causing the water vapor in the air to condense into water, thereby achieving the purpose of dehumidification.

[0089] In one embodiment, the energy storage system 10 is configured to enter the sixth working mode when the dew point temperature is higher than a third preset value, and exit the sixth working mode until the dew point temperature drops to a fourth preset value. The specific value of the third preset value is not limited, for example but not limited to: 13 °C, 15 °C, etc.; the specific value of the fourth preset value is not limited, for example but not limited to: 12 °C, 10 °C, etc. The sixth working mode is applicable to dehumidifying the environment where the battery pack 100 is located.

[0090] Please refer to Figure 8 In one embodiment, the energy storage system 10 has a seventh working mode. When the energy storage system 10 enters the seventh working mode, the temperature control system 300 is configured to control the radiator 340 to operate, control the first switching device 301 to disconnect the first heat exchange circuit 310 from the second heat exchange circuit 320, and control the refrigerant discharged from the compressor 361 to circulate in the third heat exchange circuit 360. The refrigerant flows through the first heat exchange channel to condense and release heat, and then is split to evaporate and absorb heat in the third heat exchange channel and to evaporate and absorb heat in the dehumidifier 372; the heat transfer medium circulates in the first heat exchange circuit 310, and the heat transfer medium flows through the fourth heat exchange channel and absorbs the cold released by the refrigerant flowing through the third heat exchange channel to cool down, and then flows through the battery pack 100; the heat transfer medium circulates in the second heat exchange circuit 320, and the heat transfer medium flows through the energy storage converter 200, then flows through the second heat exchange channel and absorbs the heat released by the refrigerant flowing through the first heat exchange channel to heat up, and then flows through the radiator 340.

[0091] It can be understood that when the energy storage system 10 operates in the fifth working mode and the sixth working mode simultaneously, that is, when it operates in the seventh working mode, at this time, the energy storage system 10 is not only used to dissipate heat from the battery pack 100 and the energy storage converter 200, but also used to dehumidify the environment where the battery pack 100 is located. As for the specific operation processes of the fifth working mode and the sixth working mode, reference can be made to the foregoing content and will not be elaborated herein one by one.

[0092] The present utility model further provides a new energy system, which includes the energy storage system 10 as described above. The specific structure of the energy storage system 10 refers to the above embodiments. Since this new energy system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the new energy system can specifically be a photovoltaic system or an electric vehicle system, etc., which is not limited herein.

[0093] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An energy storage system, characterized in that: It includes a battery pack, an energy storage converter and a temperature control system, wherein the energy storage converter is electrically connected to the battery pack, wherein: The temperature control system includes a first heat exchange circuit, a second heat exchange circuit, a bypass branch, a radiator, a first switching device and a second switching device, wherein the first heat exchange circuit is configured for heat exchange with the battery pack, and the second heat exchange circuit is configured for heat exchange with the energy storage converter; the first switching device is connected to the inlet and outlet of the first heat exchange circuit and the inlet and outlet of the second heat exchange circuit, and the first switching device is also used to control the connection or disconnection of the first heat exchange circuit and the second heat exchange circuit; The second heat exchange circuit includes a first sub-circuit and a second sub-circuit that are connected, the energy storage inverter is arranged in the first sub-circuit, the radiator is arranged in the second sub-circuit, the bypass branch is connected in parallel with the second sub-circuit, the second switching device connects the bypass branch, the second sub-circuit and the first sub-circuit, and the second switching device is used to control the ratio of the heat exchange medium flowing through the second sub-circuit and the bypass branch.

2. The energy storage system according to claim 1, characterized in that: The second sub-path is connected in series with the first sub-path, the energy storage converter is located upstream of the radiator on the second heat exchange circuit, and the second switching device is connected with the outlet of the bypass branch and the outlet of the second sub-path.

3. The energy storage system according to claim 2, characterized in that: The temperature control system also includes a pipe joint, a first interface of the pipe joint is connected to the first sub-path, a second interface of the pipe joint is connected to the inlet of the second sub-path, and a third interface of the pipe joint is connected to the inlet of the bypass branch.

4. The energy storage system according to claim 1, characterized in that: The energy storage system has a first working mode. The temperature control system is used to control the operation of the radiator in the first working mode, and control the first switching device to connect the first heat exchange circuit and the second heat exchange circuit in series. The heat exchange medium flows through the battery pack and the energy storage inverter in sequence, and then is diverted to the radiator and the bypass branch, and then the mixing ratio is adjusted by the second switching device, and then flows back to the first heat exchange circuit for circulation.

5. The energy storage system according to claim 1, characterized in that: The temperature control system further includes a heating device, which is disposed in the first heat exchange circuit and is used to heat a heat exchange medium flowing through the battery pack.

6. The energy storage system according to claim 5, characterized in that: The energy storage system has a second working mode. The temperature control system is used to control the heating device to work and the radiator to stop working when the energy storage system enters the second working mode, and control the first switching device to connect the first heat exchange circuit and the second heat exchange circuit in series. The heat exchange medium flows through the heating device, and then flows through the battery pack, the energy storage inverter, the bypass branch and the second switching device in sequence before flowing back to the first heat exchange circuit for circulation.

7. The energy storage system according to claim 5, characterized in that: The energy storage system has a third working mode. The temperature control system is used to control the heating device to work and the radiator to stop working when the energy storage system enters the third working mode, and control the first switching device to disconnect the first heat exchange circuit from the second heat exchange circuit, so that the heat exchange medium flows through the heating device, then flows through the battery pack, and circulates along the first heat exchange circuit.

8. The energy storage system according to claim 1, characterized in that: The energy storage system has a fourth operating mode, and the temperature control system is used to control the radiator to stop working when the energy storage system enters the fourth operating mode, and control the first switching device to disconnect the first heat exchange circuit from the second heat exchange circuit, so that the heat exchange medium flows through the battery pack and circulates along the first heat exchange circuit.

9. The energy storage system according to claim 1, characterized in that: The temperature control system further includes a second pump body, which is arranged on the second heat exchange circuit between the inlet of the second heat exchange circuit and the energy storage converter; And / or, the temperature control system further includes a closed expansion tank, and the closed expansion tank is arranged on the second heat exchange circuit.

10. The energy storage system according to claim 1, characterized in that: The first switching device is a four-way valve; and / or the second switching device is a proportional three-way valve; And / or, the radiator is a dry cooler.

11. The energy storage system according to any one of claims 1 to 10, characterized in that: The temperature control system also includes a third heat exchange circuit, which includes a compressor, a first heat exchange device, a first throttle valve and a second heat exchange device connected in sequence, the first heat exchange device is connected to the second heat exchange circuit between the energy storage inverter and the inlet of the radiator, and the second heat exchange device is connected to the first heat exchange circuit.

12. The energy storage system according to claim 11, characterized in that: The first heat exchange device has a first heat exchange channel and a second heat exchange channel arranged to exchange heat with each other, the second heat exchange device has a third heat exchange channel and a fourth heat exchange channel arranged to exchange heat with each other, the compressor, the first heat exchange channel, the first throttle valve and the third heat exchange channel are connected in sequence to form a circulation loop, and the second heat exchange channel is connected in series to the second sub-channel between the energy storage inverter and the radiator.

13. The energy storage system according to claim 12, characterized in that: The temperature control system also includes a first pump body, which is arranged on the first heat exchange circuit between the battery pack and the inlet of the first heat exchange circuit, and the fourth heat exchange channel is connected in series on the first heat exchange circuit between the battery pack and the outlet of the first pump body.

14. The energy storage system according to claim 13, characterized in that: The energy storage system has a fifth working mode, and the temperature control system is used to control the radiator to work when the energy storage system enters the fifth working mode, control the first switching device to disconnect the first heat exchange circuit from the second heat exchange circuit, and control the refrigerant discharged from the compressor to circulate in the third heat exchange circuit, so that the refrigerant flows through the first heat exchange channel to condense and release heat, and then flows through the third heat exchange channel to evaporate and absorb heat; The heat exchange medium circulates in the first heat exchange circuit, and the heat exchange medium flows through the fourth heat exchange channel and absorbs the cold released by the refrigerant flowing through the third heat exchange channel to cool down, and then flows through the battery pack; The heat exchange medium circulates in the second heat exchange circuit, passes through the energy storage converter, passes through the second heat exchange channel and absorbs heat released by the refrigerant passing through the first heat exchange channel to increase the temperature, and then passes through the radiator.

15. The energy storage system according to claim 11, characterized in that: The temperature control system further includes a dehumidification device, which includes a second throttle valve and a dehumidifier connected in series through a pipeline, and the dehumidification device is connected in parallel with the first throttle valve and the second heat exchange device.

16. A new energy system, characterized in that: Comprising the energy storage system as claimed in any one of claims 1 to 15.

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