Energy storage system and liquid cooling heat management system thereof, and converter liquid cooling loop

Abstract

The utility model relates to an energy storage system, a liquid cooling heat management system thereof and a converter liquid cooling loop. The liquid cooling heat management system comprises a battery liquid cooling loop and a converter liquid cooling loop; the battery liquid cooling loop comprises a first main pipeline and a heat exchange branch; the first main pipeline is used for circulating first cooling liquid so as to cool the battery pack; the heat exchange branch is arranged on the first main pipeline in parallel, and a control valve is arranged on the heat exchange branch and used for controlling the flow of the first cooling liquid flowing into the heat exchange branch; the converter liquid cooling loop comprises a second main pipeline; the second main pipeline is used for circulating a second cooling liquid and is arranged in heat exchange with the heat exchange branch, so that the converter is cooled through heat exchange between the first cooling liquid circulating in the heat exchange branch and the second cooling liquid circulating in the second main pipeline; and the temperature of the first cooling liquid flowing into the heat exchange branch is lower than that of the second cooling liquid flowing in the second main pipeline. In this way, condensation can be avoided in the cooling process of the converter.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system and its liquid-cooled thermal management system, and a converter liquid cooling circuit. Background Art

[0002] With the recent rise of new energy industries such as photovoltaics, wind power, and energy storage, inverters, wind power converters, and energy storage converters have been continuously evolving towards high power and integration to meet the demands of large-scale grid connection. Conventional thermal management solutions, such as air cooling and air cooling combined with heat pipes, are increasingly unable to meet the demands of this industry. Liquid cooling solutions, with their higher heat dissipation efficiency and more compact structure, are gaining popularity among practitioners, particularly in the energy storage sector, where liquid battery cooling solutions are already well established.

[0003] As the integration of energy storage systems continues to increase, the transition from air cooling to liquid cooling is becoming a new industry trend for power conversion systems (PCS). Conventional PCS liquid cooling solutions use liquid cooling plates to dissipate heat from power devices and reactors. The principle can be understood as follows: the heat dissipation surface of the device is bonded to the surface of the liquid cooling plate, and coolant flows through the internal cavity of the liquid cooling plate. Heat is transferred from the device heat dissipation surface to the surface of the liquid cooling plate, and then to the coolant. The heat is ultimately carried out of the cold plate by the coolant and dissipated to the ambient environment through an external heat exchanger.

[0004] Currently, conventional energy storage systems typically use PCS liquid cooling solutions that draw coolant directly from the battery liquid cooling circuit. This means the PCS and battery water circuits are connected in parallel. This approach simplifies the thermal management architecture, eliminating the need to develop a new temperature control system and corresponding water supply system. Introducing a liquid-cooled PCS is equivalent to adding a battery pack, making it easy to implement. However, this presents a problem: the water supply temperature in the battery liquid cooling circuit is typically 20°C. This is because the optimal operating temperature of lithium batteries is typically 15-35°C, while the internal operating temperature of the PCS can often reach 80°C or even hundreds of degrees Celsius. The presence of "low-temperature" coolant (e.g., around 20°C) can cause a large amount of condensation, endangering the safe operation of the PCS. Utility Model Content

[0005] Based on this, it is necessary to provide an energy storage system and its liquid-cooled thermal management system, and a converter liquid cooling circuit to address the above technical problems.

[0006] In a first aspect, the present application provides a liquid-cooled thermal management system for an energy storage system, comprising a battery liquid cooling circuit and a converter liquid cooling circuit;

[0007] The battery liquid cooling circuit includes a first main pipeline and a heat exchange branch; the first main pipeline is used for circulating a first coolant and is connected to the battery pack in the energy storage system to cool the battery pack; the heat exchange branch is arranged in parallel on the first main pipeline, wherein a control valve is arranged on the heat exchange branch to control the flow rate of the first coolant flowing into the heat exchange branch.

[0008] The converter liquid cooling circuit includes a second main pipeline; the second main pipeline is used for circulating a second coolant and is connected to the converter in the energy storage system and is arranged for heat exchange with the heat exchange branch, so as to cool the converter through the heat exchange between the first coolant flowing in the heat exchange branch and the second coolant flowing in the second main pipeline, wherein the temperature of the first coolant flowing into the heat exchange branch is lower than the temperature of the second coolant flowing in the second main pipeline.

[0009] In one embodiment, the second main pipeline is arranged for heat exchange with the heat exchange branch through a first heat exchanger.

[0010] In one embodiment, the first main pipeline includes a heat exchange loop and a cooling loop;

[0011] The heat exchange loop is used for circulating the first coolant and is connected to the battery pack;

[0012] The cooling loop is used for circulating a third coolant, and the cooling loop is arranged for heat exchange with the heat exchange loop through a second heat exchanger, so as to cool the battery pack through the heat exchange between the third coolant flowing in the cooling loop and the first coolant flowing in the heat exchange loop, wherein the temperature of the third coolant flowing in the cooling loop is lower than the temperature of the first coolant flowing in the heat exchange loop;

[0013] The heat exchange branch is arranged in parallel on the heat exchange loop.

[0014] In one embodiment, the water outlet of the battery pack is connected to the second heat exchanger through a first pipeline, and the second heat exchanger is connected to the water inlet of the battery pack through a second pipeline to form the heat exchange loop;

[0015] The water inlet of the heat exchange branch is arranged on the second pipeline, the water outlet of the heat exchange branch is arranged on the first pipeline, and the control valve is arranged at the water inlet of the heat exchange branch.

[0016] In one embodiment, a first water pump is arranged on the first pipeline, and a heater is arranged on the second pipeline.

[0017] The water inlet of the heat exchange branch is arranged on the pipeline between the second heat exchanger and the heater, and the water outlet of the heat exchange branch is arranged on the pipeline between the first water pump and the water outlet of the battery pack.

[0018] In one embodiment, the control valve includes a two-way proportional regulating valve;

[0019] The first end of the two-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, and the second end of the two-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

[0020] In one embodiment, the control valve includes a three-way proportional regulating valve;

[0021] The first end of the three-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, the second end of the three-way proportional regulating valve is connected to the heater through a pipeline, and the third end of the three-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

[0022] In one embodiment, the control valve includes a first two-way proportional regulating valve and a second two-way proportional regulating valve;

[0023] The first end of the first two-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, and the second end of the first two-way proportional regulating valve is connected to the second heat exchanger through a pipeline;

[0024] The first end of the second two-way proportional regulating valve is connected to the heater through a pipeline, and the second end of the second two-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

[0025] In one embodiment, the cooling circuit includes a compressor, a condenser and an expansion valve;

[0026] The second heat exchanger is connected to the input port of the condenser through the compressor, and the output port of the condenser is connected to the second heat exchanger through the expansion valve.

[0027] In one embodiment, the cooling circuit further includes a radiator and a four-way valve;

[0028] One end of the control valve is connected to the first heat exchanger through a pipeline, the second end of the control valve is connected to the first end of the four-way valve through a pipeline, the second end of the four-way valve is connected to the second heat exchanger through a pipeline, the third end of the four-way valve is connected to one port of the radiator through a pipeline, and the fourth end of the four-way valve is connected to the other port of the radiator through a pipeline.

[0029] In a second aspect, the present application also provides a liquid cooling circuit for an inverter, which includes a second main pipeline and a heat exchange branch;

[0030] The second main pipeline is used for circulating a second coolant, is connected to the inverter, and is heat-exchanged with the heat exchange branch, so as to cool the inverter by heat exchange between the fourth coolant flowing in the heat exchange branch and the second coolant flowing in the second main pipeline;

[0031] Wherein, the temperature of the fourth coolant flowing into the heat exchange branch is lower than the temperature of the second coolant flowing in the second main pipeline; a control valve is arranged on the heat exchange branch for controlling the flow rate of the fourth coolant flowing into the heat exchange branch from the outside of the liquid cooling circuit of the inverter.

[0032] In a third aspect, the present application also provides an energy storage system, which includes a battery pack, an inverter, and the liquid cooling and heat management system of the energy storage system as described in the first aspect.

[0033] The above-mentioned energy storage system, its liquid cooling and heat management system, and the liquid cooling circuit of the inverter, wherein the cooling and heat management system includes a battery liquid cooling circuit and a liquid cooling circuit of the inverter.

[0034] The battery liquid cooling circuit includes a first main pipeline and a heat exchange branch; the first main pipeline is used for circulating a first coolant and is connected to the battery pack in the energy storage system for cooling the battery pack; the heat exchange branch is arranged in parallel on the first main pipeline, wherein a control valve is arranged on the heat exchange branch for controlling the flow rate of the first coolant flowing into the heat exchange branch;

[0035] The liquid cooling circuit of the inverter includes a second main pipeline; the second main pipeline is used for circulating a second coolant, is connected to the inverter in the energy storage system, and is heat-exchanged with the heat exchange branch, so as to cool the inverter by heat exchange between the first coolant flowing in the heat exchange branch and the second coolant flowing in the second main pipeline, wherein the temperature of the first coolant flowing into the heat exchange branch is lower than the temperature of the second coolant flowing in the second main pipeline;

[0036] In this way, the low-temperature first coolant in the heat exchange branch of the battery liquid cooling circuit is used to perform heat exchange with the high-temperature second coolant in the second main pipeline of the liquid cooling circuit of the inverter, and the second coolant after this heat exchange is used to cool the inverter. Since the temperature of the second coolant after this heat exchange is within a suitable temperature range that is neither low nor high, the generation of condensation can be avoided during the process of using it to cool the inverter.

[0037] The energy storage system and its liquid cooling thermal management system according to the embodiments of the present application only need to set a heat exchange branch in the original battery liquid cooling loop and arrange heat exchange between the heat exchange branch and the second main pipeline of the converter liquid cooling loop, so that only one ordinary liquid cooling unit can be used to supply coolants at two water temperatures, which are respectively used for cooling the battery pack and the converter. Moreover, the coolant used for cooling the converter can be in a suitable temperature range that is neither too low nor too high, so that condensation can be avoided during the cooling process of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 FIG. 6 is one of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0039] Figure 2 FIG. 10 is the second of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0040] Figure 3 FIG. 14 is the third of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0041] Figure 4 FIG. 18 is the fourth of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0042] Figure 5 FIG. 22 is the fifth of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0043] Figure 6 FIG. 26 is the sixth of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0044] Figure 7 FIG. 30 is the seventh of the schematic structural diagrams of the liquid cooling thermal management system of the energy storage system in an embodiment;

[0045] Figure 8 FIG. 34 is the schematic structural diagram of the converter liquid cooling loop in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] Any energy storage system in the embodiments of the present application includes both a battery pack and an inverter; and any liquid cooling thermal management system is used to cool both the battery pack and the inverter, and during the process of cooling the inverter, condensation can be avoided. It can be understood that the number of inverters and the number of batteries in the battery pack can both be set as required, that is, it can be one or multiple (for example, PCS*n and Pack* n, where n is a positive integer greater than 1).

[0048] In one embodiment, referring to Figure 1 , a liquid cooling thermal management system for an energy storage system is provided. The liquid cooling thermal management system includes a battery liquid cooling loop and an inverter liquid cooling loop.

[0049] The battery liquid cooling loop includes a first main pipeline 110 and a heat exchange branch 130. The first main pipeline 110 is used for circulating a first coolant and is connected to the battery pack in the energy storage system to cool the battery pack; the heat exchange branch 130 is arranged in parallel on the first main pipeline 110. Among them, a control valve 140 is arranged on the heat exchange branch 130 to control the flow rate of the first coolant flowing into the heat exchange branch 130.

[0050] The inverter liquid cooling loop includes a second main pipeline 120. The second main pipeline 120 is used for circulating a second coolant, is connected to the inverter in the energy storage system, and is arranged for heat exchange with the heat exchange branch 130, so as to cool the inverter through the heat exchange between the first coolant flowing in the heat exchange branch 130 and the second coolant flowing in the second main pipeline 120. Among them, the temperature of the first coolant flowing into the heat exchange branch 130 is lower than the temperature of the second coolant flowing in the second main pipeline 120.

[0051] In the liquid cooling thermal management system of the embodiments of the present application, the low-temperature first coolant in the first main pipeline 110 is used to cool the battery pack. On this basis, by adjusting the opening degree of the control valve 140, the flow rate of the low-temperature first coolant in the first main pipeline 110 flowing into the heat exchange branch 130 can be controlled; furthermore, the low-temperature first coolant flowing into the heat exchange branch 130 will exchange heat with the high-temperature second coolant in the second main pipeline 120 of the inverter liquid cooling loop, and the second coolant after this heat exchange is used to cool the inverter. Because the temperature of the second coolant after this heat exchange is within a suitable temperature range that is neither low nor high, condensation can be avoided during the process of using it to cool the inverter.

[0052] In other words, for the liquid cooling thermal management system of the embodiments of the present application, only a heat exchange branch 130 needs to be arranged in the original battery liquid cooling loop, and the heat exchange branch 130 is arranged for heat exchange with the second main pipeline 120 of the converter liquid cooling loop, so that only one ordinary liquid cooling unit can be used to supply coolants at two water temperatures, which are respectively used for cooling the battery pack and the converter. Moreover, since the coolant used for cooling the converter can be within a suitable temperature range that is neither too low nor too high, condensation can be avoided during the cooling process of the converter.

[0053] In one embodiment, with continued reference to Figure 1 , the second main pipeline 120 is arranged for heat exchange with the heat exchange branch 130 through the first heat exchanger 150. In this way, the heat exchange arrangement is easy to implement and has a simple structure.

[0054] In one embodiment, with reference to Figure 2 , the first main pipeline 110 includes a heat exchange loop 111 and a cooling loop 112. The heat exchange branch 130 is arranged in parallel on the heat exchange loop 111. The heat exchange loop 111 is used for circulating the first coolant and is connected to the battery pack. The cooling loop 112 is used for circulating the third coolant. The cooling loop 112 is arranged for heat exchange with the heat exchange loop 111 through the second heat exchanger 160, so as to cool the battery pack through the heat exchange between the third coolant flowing in the cooling loop 112 and the first coolant flowing in the heat exchange loop 111. Among them, the temperature of the third coolant flowing in the cooling loop 112 is lower than the temperature of the first coolant flowing in the heat exchange loop 111.

[0055] It can be understood that the first coolant flowing in the heat exchange loop 111 exchanges heat with the third coolant flowing in the cooling loop 112 through the second heat exchanger 160. After this heat exchange, the first coolant is used for cooling the battery pack and is also used for being diverted to the heat exchange branch 130 based on the opening degree of the control valve 140 to exchange heat with the second coolant in the second main pipeline 120 of the converter liquid cooling loop.

[0056] In one embodiment, with continued reference to Figure 2 , the water outlet of the battery pack is connected to the second heat exchanger 160 through the first pipeline, and the second heat exchanger 160 is connected to the water inlet of the battery pack through the second pipeline to form the heat exchange loop 111; the water inlet of the heat exchange branch 130 is arranged on the second pipeline, the water outlet of the heat exchange branch 130 is arranged on the first pipeline, and the control valve 140 is arranged at the water inlet of the heat exchange branch 130.

[0057] It can be understood that the first coolant after cooling the battery pack converges with the first coolant after heat exchange with the second coolant in the second main pipeline 120 of the converter liquid cooling circuit, and the converged first coolant exchanges heat with the third coolant flowing in the cooling circuit 112 through the second heat exchanger 160 to cool the first coolant.

[0058] In one embodiment, referring to Figure 3 , a first water pump 1111 is provided on the first pipeline, and a heater 1112 is provided on the second pipeline; the water inlet of the heat exchange branch 130 is provided on the pipeline between the second heat exchanger 160 and the heater 1112, and the water outlet of the heat exchange branch 130 is provided on the pipeline between the first water pump 1111 and the water outlet of the battery pack.

[0059] It can be understood that the first coolant after cooling the battery pack converges with the first coolant after heat exchange with the second coolant in the second main pipeline 120 of the converter liquid cooling circuit, and the converged first coolant is transported to the second heat exchanger 160 by the first water pump 1111. When it is necessary to heat the coolant, the heater 1112 can be turned on to allow the coolant to flow through the heater 1112 to achieve heating of the coolant; when heating is not required, the heater 1112 can be turned off to stop the heater 1112 from heating the coolant.

[0060] In one embodiment, continuing to refer to Figure 3 , the second main pipeline 120 may include a second water pump 1211 to transport the second coolant after cooling the converter to the first heat exchanger 150.

[0061] In one embodiment, referring to Figure 4 , the control valve 140 includes a two-way proportional regulating valve 141; the first end of the two-way proportional regulating valve 141 is connected to the water inlet of the heat exchange branch 130 through a pipeline, and the second end of the two-way proportional regulating valve 141 is connected to the second heat exchanger 160 through a pipeline. Among them, the proportional regulating valve refers to an electric valve that combines proportional and integral calculations during execution. The farther the calculated value is from the set value, the faster the stepping motor operates, and it is basically a decaying sine wave.

[0062] It can be understood that the control valve 140 includes a two-way proportional regulating valve 141. By adjusting the opening degree of the two-way proportional regulating valve 141, the flow rate of the first coolant flowing into the heat exchange branch 130 can be controlled. Among them, the larger the opening degree of the two-way proportional regulating valve 141, the larger the flow rate of the first coolant flowing into the heat exchange branch 130. Then, during the heat exchange process between the heat exchange branch 130 and the second main pipeline 120 of the converter liquid cooling loop, more heat of the second coolant in the second main pipeline 120 is taken away. The smaller the opening degree of the two-way proportional regulating valve 141, the smaller the flow rate of the first coolant flowing into the heat exchange branch 130. Then, during the heat exchange process between the heat exchange branch 130 and the second main pipeline 120 of the converter liquid cooling loop, less heat of the second coolant in the second main pipeline 120 is taken away.

[0063] In this embodiment, the control valve 140 adopts a two-way proportional regulating valve 141, so that the structure of the control valve 140 is simple, the cost is low, and it is easy to implement.

[0064] In one embodiment, referring to Figure 5 , the control valve 140 includes a first two-way proportional regulating valve 142 and a second two-way proportional regulating valve 143. The first end of the first two-way proportional regulating valve 142 is connected to the water inlet of the heat exchange branch 130 through a pipeline, and the second end of the first two-way proportional regulating valve 142 is connected to the second heat exchanger 160 through a pipeline. The first end of the second two-way proportional regulating valve 143 is connected to the heater 1112 through a pipeline, and the second end of the second two-way proportional regulating valve 143 is connected to the second heat exchanger 160 through a pipeline.

[0065] In this embodiment, the control valve 140 adopts two two-way proportional regulating valves, so that the control of the flow rate of the first coolant in the first main pipeline 110 and the flow rate of the first coolant in the heat exchange branch 130 is more precise, and it can also avoid the situation where even when a single two-way proportional regulating valve 141 is fully opened, it cannot meet the flow rate of the first coolant required for the converter heat dissipation when the control valve 140 only adopts a single two-way proportional regulating valve 141.

[0066] In one embodiment, referring to Figure 6 , the control valve 140 includes a three-way proportional regulating valve 144. The first end of the three-way proportional regulating valve 144 is connected to the water inlet of the heat exchange branch 130 through a pipeline, the second end of the three-way proportional regulating valve 144 is connected to the heater 1112 through a pipeline, and the third end of the three-way proportional regulating valve 144 is connected to the second heat exchanger 160 through a pipeline.

[0067] In this embodiment, the control valve 140 adopts a three-way proportional control valve 144, which makes it easier to control the flow rate of the first coolant in the first main pipeline 110 and the flow rate of the first coolant in the heat exchange branch 130, and also has a lower cost compared to using two two-way proportional control valves.

[0068] In one embodiment, with continued reference to Figure 6 , the cooling circuit 112 includes a compressor 1121, a condenser 1122, and an expansion valve 1123; the second heat exchanger 160 is connected to the input port of the condenser 1122 through the compressor 1121, and the output port of the condenser 1122 is connected to the second heat exchanger 160 through the expansion valve 1123. In this way, a liquid cooling unit of the liquid-cooled heat management system is formed.

[0069] In one embodiment, with reference to Figure 7 , the cooling circuit 112 further includes a radiator 1124 and a four-way valve 1125; one end of the control valve 140 is connected to the first heat exchanger 150 through a pipeline, the second end of the control valve 140 is connected to the first end of the four-way valve 1125 through a pipeline, the second end of the four-way valve 1125 is connected to the second heat exchanger 160 through a pipeline, the third end of the four-way valve 1125 is connected to one port of the radiator 1124 through a pipeline, and the fourth end of the four-way valve 1125 is connected to the other port of the radiator 1124 through a pipeline. In this way, a liquid cooling unit of the liquid-cooled heat management system is further formed.

[0070] It can be understood that when the ambient temperature is relatively high, the liquid-cooled heat management system can cool down the circuit by compression refrigeration; when the ambient temperature is relatively low, the liquid-cooled heat management system can dissipate heat through the radiator 1124, and at this time, the compression refrigeration does not work.

[0071] The embodiment of the present application further provides a converter liquid cooling circuit that can be independently set.

[0072] In one embodiment, with reference to Figure 8 , a converter liquid cooling circuit is provided. The converter liquid cooling circuit includes a second main pipeline 120 and a heat exchange branch 130. The second main pipeline 120 is used for circulating a second coolant, is connected to the converter, and is heat-exchanged with the heat exchange branch 130 to cool down the converter through the heat exchange between the fourth coolant flowing in the heat exchange branch 130 and the second coolant flowing in the second main pipeline 120; wherein, the temperature of the fourth coolant flowing into the heat exchange branch 130 is lower than the temperature of the second coolant flowing in the second main pipeline 120; a control valve 140 is provided on the heat exchange branch 130 for controlling the flow rate of the fourth coolant flowing into the heat exchange branch 130 from the outside of the converter liquid cooling circuit.

[0073] It can be understood that a liquid cooling plate can be configured for the converter. The independently provided converter liquid cooling circuit can adopt a compartment design with the converter. The compartment where the converter liquid cooling circuit is located is electrically isolated from the compartment where the converter is located, ensuring the safe use of the converter liquid cooling circuit. Among them, the fourth coolant can be the first coolant in the first main pipeline 110 of the battery liquid cooling circuit, or the coolant in the pipeline of other liquid cooling circuits. This embodiment does not make specific limitations on this.

[0074] The converter liquid cooling circuit and the liquid heat management system provided in the embodiments of the present application belong to the same utility model concept, can solve the same technical problems, and achieve the same technical effects. The repeated content will not be elaborated here.

[0075] The embodiments of the present application also provide an energy storage system, which includes a battery pack, a converter, and the liquid heat management system of the energy storage system provided in any of the above embodiments.

[0076] In another embodiment, the energy storage system may also include a battery pack, a converter, a battery liquid cooling circuit, and an independently provided converter liquid cooling circuit.

[0077] The energy storage system and the liquid heat management system provided in the embodiments of the present application belong to the same utility model concept, can solve the same technical problems, and achieve the same technical effects. The repeated content will not be elaborated here.

[0078] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0079] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A liquid cooling and heating management system for an energy storage system, characterized in that, It includes a battery liquid cooling circuit and a converter liquid cooling circuit; The battery liquid cooling circuit includes a first main pipeline and a heat exchange branch; the first main pipeline is used for circulating a first coolant and is connected to the battery pack in the energy storage system to cool the battery pack; the heat exchange branch is arranged in parallel on the first main pipeline, and a control valve is arranged on the heat exchange branch to control the flow rate of the first coolant flowing into the heat exchange branch; The converter liquid cooling circuit includes a second main pipeline; the second main pipeline is used for circulating a second coolant and is connected to the converter in the energy storage system and is arranged for heat exchange with the heat exchange branch, so as to cool the converter through the heat exchange between the first coolant flowing in the heat exchange branch and the second coolant flowing in the second main pipeline, wherein the temperature of the first coolant flowing into the heat exchange branch is lower than the temperature of the second coolant flowing in the second main pipeline.

2. The liquid cooling and heating management system of the energy storage system according to claim 1, characterized in that, The second main pipeline is arranged for heat exchange with the heat exchange branch through a first heat exchanger.

3. The liquid cooling and heating management system of the energy storage system according to claim 1 or 2, characterized in that The first main pipeline includes a heat exchange circuit and a cooling circuit; The heat exchange circuit is used for circulating the first coolant and is connected to the battery pack; The cooling circuit is used for circulating a third coolant, and the cooling circuit is arranged for heat exchange with the heat exchange circuit through a second heat exchanger, so as to cool the battery pack through the heat exchange between the third coolant flowing in the cooling circuit and the first coolant flowing in the heat exchange circuit, wherein the temperature of the third coolant flowing in the cooling circuit is lower than the temperature of the first coolant flowing in the heat exchange circuit; The heat exchange branch is arranged in parallel on the heat exchange circuit.

4. The liquid cooling and heating management system of the energy storage system according to claim 3, wherein The water outlet of the battery pack is connected to the second heat exchanger through a first pipeline, and the second heat exchanger is connected to the water inlet of the battery pack through a second pipeline to form the heat exchange circuit; The water inlet of the heat exchange branch is arranged on the second pipeline, the water outlet of the heat exchange branch is arranged on the first pipeline, and the control valve is arranged at the water inlet of the heat exchange branch.

5. The liquid cooling and heating management system of the energy storage system according to claim 4, characterized in that A first water pump is arranged on the first pipeline, and a heater is arranged on the second pipeline; The water inlet of the heat exchange branch is arranged on the pipeline between the second heat exchanger and the heater, and the water outlet of the heat exchange branch is arranged on the pipeline between the first water pump and the water outlet of the battery pack.

6. The liquid cooling and heating management system of the energy storage system according to claim 5, characterized in that, The control valve includes a two-way proportional regulating valve; The first end of the two-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, and the second end of the two-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

7. The liquid cooling and heating management system of the energy storage system according to claim 5, characterized in that, The control valve includes a three-way proportional regulating valve; The first end of the three-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, the second end of the three-way proportional regulating valve is connected to the heater through a pipeline, and the third end of the three-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

8. The liquid cooling and heating management system of the energy storage system according to claim 5, characterized in that, The control valve includes a first two-way proportional regulating valve and a second two-way proportional regulating valve; The first end of the first two-way proportional regulating valve is connected to the water inlet of the heat exchange branch through a pipeline, and the second end of the first two-way proportional regulating valve is connected to the second heat exchanger through a pipeline; The first end of the second two-way proportional regulating valve is connected to the heater through a pipeline, and the second end of the second two-way proportional regulating valve is connected to the second heat exchanger through a pipeline.

9. The liquid cooling and heating management system of the energy storage system according to claim 5, characterized in that, The cooling circuit includes a compressor, a condenser, and an expansion valve; The second heat exchanger is connected to the input port of the condenser through the compressor, and the output port of the condenser is connected to the second heat exchanger through the expansion valve.

10. The liquid cooling and heating management system of the energy storage system according to claim 9, wherein, The cooling circuit further includes a radiator and a four-way valve; One end of the control valve is connected to the first heat exchanger through a pipeline, the second end of the control valve is connected to the first end of the four-way valve through a pipeline, the second end of the four-way valve is connected to the second heat exchanger through a pipeline, the third end of the four-way valve is connected to one port of the radiator through a pipeline, and the fourth end of the four-way valve is connected to the other port of the radiator through a pipeline.

11. A liquid cooling circuit for an inverter, characterized in that, It includes a second main pipeline and a heat exchange branch; The second main pipeline is used for circulating the second coolant, is connected to the converter, and is heat-exchanged with the heat exchange branch, so as to cool the converter through the heat exchange between the fourth coolant flowing in the heat exchange branch and the second coolant flowing in the second main pipeline; Wherein, the temperature of the fourth coolant flowing into the heat exchange branch is lower than the temperature of the second coolant flowing in the second main pipeline; a control valve is arranged on the heat exchange branch for controlling the flow rate of the fourth coolant flowing into the heat exchange branch from the outside of the liquid cooling circuit of the converter.

12. An energy storage system, characterized in that, A liquid cooling heat management system including a battery pack, a converter, and the energy storage system according to any one of claims 1-10.

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