Double-water-outlet system of parallel cooling battery pack and energy storage converter

Abstract

The utility model provides a double-water-outlet system for cooling a battery pack and an energy storage converter in parallel, and relates to the technical field of electrochemistry. An outlet of a cooling liquid channel of a plate heat exchanger is communicated with a liquid supply port of a cooling liquid channel of the battery pack through an electric heater; a liquid return opening of the battery pack cooling liquid channel is communicated with a cooling liquid channel inlet of the plate heat exchanger through a first water pump; an exhaust port of the compressor communicates with a refrigerant channel inlet of the plate heat exchanger through the first heat exchanger, and a refrigerant channel outlet of the plate heat exchanger communicates with an air inlet of the compressor. An outlet of the second heat exchanger communicates with a liquid supply opening of the cooling liquid channel of the energy storage converter, and a liquid return opening of the cooling liquid channel of the energy storage converter communicates with an inlet of the second heat exchanger through a second water pump. The lithium battery pack and the energy storage converter are subjected to temperature control in two modes, the energy consumption of the temperature control system is saved by using a natural cold source, and the total energy consumption and the wasted energy consumption are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical energy storage, in particular to a dual water outlet system for cooling a battery pack and an energy storage converter in parallel. Background Art

[0002] Renewable energy generation is gradually accounting for an increasing proportion of social electricity. Since photovoltaic, wind power and other renewable energy sources vary greatly with seasons and weather conditions, the introduction of energy storage technology can improve the mismatch between wind power, photovoltaic power generation and electricity load, and has therefore become an important part of energy planning. Energy storage technologies include pumped storage, compressed air, electrochemical energy storage and hydrogen energy storage. Among them, pumped storage and compressed air require suitable locations, while hydrogen energy storage is currently in the research stage. Electrochemical energy storage has entered the industry's field of vision and is gradually becoming an important energy storage technology.

[0003] Among the new energy storage technologies based on electrochemical energy storage, lithium-ion battery energy storage technology is the most widely used new energy storage technology. In energy storage systems, both lithium battery packs and energy storage converters (PCS) need to precisely control the operating temperature to avoid failures caused by exceeding operating conditions. In the existing technology, the lithium battery pack is generally fixed to the battery pack coolant channel, and the heat of the lithium battery pack is removed by the coolant in the battery pack coolant channel; the energy storage converter is fixed to the energy storage converter coolant channel, and the heat of the energy storage converter is removed by the coolant in the energy storage converter coolant channel. The battery pack coolant channel and the energy storage converter coolant channel are both connected to equipment such as compressors and heat exchangers to achieve temperature control, so that the temperature of the lithium battery pack and the energy storage converter are controlled to operate within a specific range.

[0004] However, the energy required for compressor cooling is very high, resulting in high energy demands. Furthermore, while existing temperature control systems can achieve temperature control, they share a common temperature control system, which means both the lithium battery pack and the energy storage inverter are controlled at the same temperature. In reality, the operating temperature requirement of the energy storage inverter is slightly lower than that of the battery pack. This also results in existing temperature control systems wasting energy on the energy storage inverter, failing to fully utilize energy for temperature control. Utility Model Content

[0005] The technical problem to be solved by the present invention is the problem of large and wasteful energy consumption in the temperature control of lithium battery packs and energy storage converters in the prior art. In order to overcome the above defects of the prior art, the present invention provides a dual water outlet system for cooling the battery pack and the energy storage converter in parallel.

[0006] The utility model provides a dual water outlet system for cooling a battery pack and an energy storage converter in parallel, comprising a compressor, a plate heat exchanger, a first heat exchanger, a second heat exchanger, a first water pump, a second water pump and an electric heater;

[0007] The coolant channel outlet of the plate heat exchanger is connected to the liquid supply port of the battery pack coolant channel through an electric heater, and the return port of the battery pack coolant channel is connected to the coolant channel inlet of the plate heat exchanger through a first water pump; the exhaust port of the compressor is connected to the refrigerant channel inlet of the plate heat exchanger through the first heat exchanger, and the refrigerant channel outlet of the plate heat exchanger is connected to the air inlet of the compressor;

[0008] The outlet of the second heat exchanger is communicated with the liquid supply port of the energy storage converter coolant channel, and the liquid return port of the energy storage converter coolant channel is communicated with the inlet of the second heat exchanger through a second water pump.

[0009] Compared with the prior art, the dual water outlet system of the present application for parallel cooling of battery packs and energy storage converters has the following advantages: the temperature of the lithium battery pack and the energy storage converter is controlled in two forms to prevent excessive temperature from affecting operation, and natural cold sources are used to save energy consumption of the temperature control system, making full use of energy, reducing total energy consumption and wasted energy, saving energy and operating costs; at the same time, an electric heater is added to perform temperature compensation when the ambient temperature is too low to prevent the lithium battery pack and the energy storage converter from failing to start.

[0010] In one possible embodiment, the outlet of the first water pump is connected to the inlet of the coolant channel of the plate heat exchanger through a first ball valve, the outlet of the first water pump is connected to the inlet of the second heat exchanger through a second ball valve, and the outlet of the second heat exchanger is connected to the inlet of the electric heater through a third ball valve; wherein, the first ball valve is open, and the second and third ball valves are closed; or the first ball valve is closed, and the second and third ball valves are opened.

[0011] Compared with the existing technology, by controlling the opening or closing of three ball valves, the operation of different control pipelines is realized, which is convenient for temperature control of lithium battery packs and energy storage converters in high temperature and low temperature environments.

[0012] In one possible embodiment, the outlet of the first water pump is connected to the coolant channel inlet of the plate heat exchanger through a first ball valve, and the outlet of the first water pump is connected to the inlet of the electric heater through a second ball valve; wherein, the first ball valve is open and the second ball valve is closed; or the first ball valve is closed and the second ball valve is open.

[0013] Compared with the existing technology, by controlling the opening or closing of the two ball valves, the operation of different control pipelines is realized, which is convenient for temperature control of lithium battery packs and energy storage converters in high temperature and low temperature environments.

[0014] In a possible implementation, the outlet of the first heat exchanger is connected to the refrigerant channel inlet of the plate heat exchanger through an electronic expansion valve.

[0015] Compared with the existing technology, the flow opening is adjusted by setting an electronic expansion valve, which facilitates precise temperature control.

[0016] In a possible implementation manner, a first fan is provided on the first heat exchanger.

[0017] Compared with the prior art, the heat exchange effect of the first heat exchanger is improved by providing the first fan.

[0018] In a possible implementation manner, a second fan is provided on the second heat exchanger.

[0019] Compared with the prior art, the heat exchange effect of the second heat exchanger is improved by providing the second fan.

[0020] In a possible implementation, the coolant in the battery pack coolant channel and the energy storage converter coolant channel is water or ethylene glycol.

[0021] Compared with the existing technology, water acts as a solvent and catalyst, and ethylene glycol can increase the density and viscosity of the coolant and improve its heat transfer performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a working schematic diagram of a first embodiment of a dual-water outlet system for parallel cooling of a battery pack and an energy storage converter according to the present invention;

[0023] Figure 2 This is a schematic diagram of the working state of a dual-water outlet system for cooling a battery pack and an energy storage converter in parallel under high ambient temperature according to the first embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the operation of a dual-water outlet system for parallel cooling of a battery pack and an energy storage converter in a low-temperature environment according to the first embodiment of the present invention;

[0025] Figure 4 This is a working schematic diagram of a second embodiment of a dual-water outlet system for parallel cooling of a battery pack and an energy storage converter according to the present invention;

[0026] Figure 5 This is a schematic diagram of the working state of a second embodiment of a dual-water outlet system for cooling a battery pack and an energy storage converter in parallel under high ambient temperature;

[0027] Figure 6 This is a schematic diagram of the operation of a second embodiment of a dual water outlet system for parallel cooling of a battery pack and an energy storage converter in a low-temperature environment according to the present invention.

[0028] Description of reference numerals:

[0029] 1-compressor; 2-plate heat exchanger; 3-first heat exchanger; 31-first fan; 4-second heat exchanger; 41-second fan; 5-first water pump; 6-second water pump; 7-battery pack coolant channel; 8-energy storage converter coolant channel; 91-first ball valve; 92-second ball valve; 93-third ball valve; 10-electronic expansion valve; 11-electric heater. DETAILED DESCRIPTION

[0030] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0031] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0032] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] See also Figures 1 to 3 As shown, an embodiment of the present application discloses a dual water outlet system for cooling a battery pack and an energy storage converter in parallel, including a compressor 1, a plate heat exchanger 2, a first heat exchanger 3, a second heat exchanger 4, a first water pump 5, a second water pump 6 and an electric heater 11.

[0035] The coolant channel outlet of the plate heat exchanger 2 is connected to the liquid supply port of the battery pack coolant channel 7 through the electric heater 11, and the return port of the battery pack coolant channel 7 is connected to the coolant channel inlet of the plate heat exchanger 2 through the first water pump 5; the exhaust port of the compressor 1 is connected to the refrigerant channel inlet of the plate heat exchanger 2 through the first heat exchanger 3, and the refrigerant channel outlet of the plate heat exchanger 2 is connected to the air inlet of the compressor 1;

[0036] The outlet of the second heat exchanger 4 is connected to the liquid supply port of the energy storage converter coolant channel 8 , and the liquid return port of the energy storage converter coolant channel 8 is connected to the inlet of the second heat exchanger 4 through the second water pump 6 .

[0037] The temperature of the lithium battery pack and the energy storage converter is controlled in two ways to prevent excessive temperature from affecting operation, and natural cooling sources are used to save energy consumption of the temperature control system, fully utilize energy, reduce total energy consumption and reduce wasted energy consumption, saving energy and operating costs; at the same time, an electric heater 11 is added to perform temperature compensation when the ambient temperature is too low, preventing the lithium battery pack and the energy storage converter from failing to start.

[0038] In this embodiment, the outlet of the first heat exchanger 3 is connected to the refrigerant channel inlet of the plate heat exchanger 2 through an electronic expansion valve 10. By providing the electronic expansion valve 10, the flow opening can be adjusted to facilitate precise control of the cooling temperature.

[0039] In this embodiment, the coolant channel outlet of the plate heat exchanger 2 is connected to the liquid supply port of the battery pack coolant channel 7 via an electric heater 11. The electric heater 11 can be wound around the wall of the liquid infusion tube connecting the coolant channel outlet of the plate heat exchanger 2 and the liquid supply port of the battery pack coolant channel 7, heating the liquid inside by heating the tube wall. Alternatively, the electric heater 11 can be directly installed within the liquid infusion tube, so that the coolant channel outlet of the plate heat exchanger 2 is first connected to the electric heater 11, which then connects to the liquid supply port of the battery pack coolant channel 7.

[0040] The first heat exchanger 3 is provided with a first fan 31. The first fan 31 is provided to improve the heat exchange effect of the first heat exchanger 3.

[0041] The second heat exchanger 4 is provided with a second fan 41. By providing the second fan 41, the heat exchange effect of the second heat exchanger 4 is improved.

[0042] In this embodiment, the coolant in the battery pack coolant channel 7 and the energy storage converter coolant channel 8 is water or ethylene glycol. Water acts as a solvent and catalyst, while ethylene glycol can increase the density and viscosity of the coolant, improving its heat transfer performance.

[0043] In this embodiment, the outlet of the first water pump 5 is connected to the coolant channel inlet of the plate heat exchanger 2 through the first ball valve 91, the outlet of the first water pump 5 is connected to the inlet of the second heat exchanger 4 through the second ball valve 92, and the outlet of the second heat exchanger 4 is connected to the inlet of the electric heater 11 through the third ball valve 93;

[0044] The first ball valve 91 is open, and the second ball valve 92 and the third ball valve 93 are closed; or the first ball valve 91 is closed, and the second ball valve 92 and the third ball valve 93 are open.

[0045] By controlling the opening or closing of the three ball valves, the operation of different control pipelines is realized, which is convenient for temperature control of lithium battery packs and energy storage converters in high temperature and low temperature environments.

[0046] For details, see Figure 1 and Figure 2 As shown, when the lithium battery pack and energy storage converter are operating in summer or in a place with very high ambient temperature, the first ball valve 91 is opened, the second ball valve 92 and the third ball valve 93 are closed, the electric heater 11 is turned off, and the refrigeration cycle is started. The temperature control system is divided into two circuits, cooling the lithium battery pack and the energy storage converter respectively:

[0047] The high-temperature water / ethylene glycol solution in the battery pack coolant channel 7 exchanges heat with the refrigerant in the refrigeration cycle through the plate heat exchanger 2 under the action of the first water pump 5. The low-temperature coolant after heat exchange cools the lithium battery pack on the battery pack coolant channel 7 again, and the cycle continues;

[0048] The refrigerant in the refrigeration cycle exchanges heat with the coolant in the battery pack coolant channel 7 in the plate heat exchanger 2, absorbs heat, and evaporates to become a low-temperature, low-pressure gas. After passing through the compressor 1, it becomes a high-temperature, high-pressure gaseous refrigerant, enters the first heat exchanger 3, and is condensed into a high-temperature, high-pressure liquid by the first fan 31. The liquid refrigerant passes through the electronic expansion valve 10 and becomes a low-temperature, low-pressure liquid, which re-enters the plate heat exchanger 2, continuing the cycle.

[0049] Since the operating temperature range of the energy storage inverter is higher, a natural cold source is used to cool the energy storage inverter. The high-temperature return water passes through the second heat exchanger 4 under the action of the second water pump 6, and the temperature is reduced after heat exchange with the external air brought by the second fan 41. It is cooled again and enters the energy storage inverter coolant channel 8. The energy storage inverter coolant channel 8 cools the energy storage inverter thereon and circulates continuously.

[0050] See also Figure 1 and Figure 3 As shown, when the lithium battery pack and energy storage converter are operating in winter or in very low ambient temperatures, and the outside air temperature can meet the operating temperature requirements of both the battery pack and the energy storage converter, the first ball valve 91 is closed, the second ball valve 92 and the third ball valve 93 are opened, the electric heater 11 is turned off, and the refrigeration cycle is activated. The temperature control system is combined into a single loop, with the battery pack coolant channel 7 and the energy storage converter coolant channel 8 connected in series to share a common natural cooling system:

[0051] The high-temperature water / ethylene glycol solution flowing out of the energy storage inverter coolant channel 8 enters the second heat exchanger 4 under the action of the second water pump 6, and is cooled by heat exchange with the outside air guided by the second fan 41. Since the lithium battery pack is more sensitive to the operating temperature than the energy storage inverter, the low-temperature solution first enters the battery pack coolant channel 7 to cool the lithium battery pack on the battery pack coolant channel 7. After heat exchange, it becomes a lower temperature solution to cool the energy storage inverter. After heat exchange, it becomes a high-temperature solution and re-enters the second heat exchanger 4, and the cycle continues.

[0052] If the ambient temperature drops below a certain level, even if the battery pack and energy storage converter are working, the surrounding environment cannot reach the optimal operating temperature. Figure 3 As shown, at this time, the first ball valve 91 is closed, the second ball valve 92 and the third ball valve 93 are open, the electric heater 11 is turned on, the second heat exchanger 4 and the second fan 41 are both turned off, and the heating cycle is started. The temperature control system is combined into a loop, and the battery pack coolant channel 7 and the energy storage converter coolant channel 8 are connected in series to share a natural heating system:

[0053] The electric heater 11 allows the heated water / ethylene glycol solution to enter the battery pack coolant channel 7 to heat the battery pack on the battery pack coolant channel 7, and then the water / ethylene glycol solution is allowed to flow into the energy storage inverter coolant channel 8 through the pipeline through the first water pump 5, and then flow back into the electric heater 11. The water / ethylene glycol solution flowing into the energy storage inverter coolant channel 8 heats the energy storage inverter, and then the water / ethylene glycol solution is returned to the electric heater 11 through the second water pump 5, and the cycle continues.

[0054] The two modes of this embodiment are switched by turning on and off three ball valves.

[0055] When the temperature is high, the liquid cooling system and natural cooling can operate independently, and the cooling power consumption on the side of the energy storage inverter coolant channel 8 is relatively small; when the temperature is low, the refrigerant circulation in the liquid cooling system can be closed, and the coolant circulation on the side of the battery pack coolant channel 7 is connected in parallel with the coolant circulation of the energy storage inverter coolant channel 8. The coolant converges, which can make the system temperature adjustment faster and more accurate, greatly reducing power consumption.

[0056] The liquid cooling system and the natural cooling system are independently turned on in different time periods, or the liquid cooling system and the natural cooling system are operated in parallel, which takes advantage of the natural cooling's low power dissipation and refrigeration, energy saving and environmental protection, simple maintenance and low cost in low temperature environments, thereby reducing the operating power consumption of the dual water outlet system.

[0057] Example 2

[0058] See also Figures 4-6 As shown, this embodiment is basically the same as the first embodiment, except that the arrangement of the ball valve is different. In this embodiment:

[0059] The outlet of the first water pump 5 is connected to the coolant channel inlet of the plate heat exchanger 2 through the first ball valve 91, and the outlet of the first water pump 5 is connected to the inlet of the electric heater 11 through the second ball valve 92;

[0060] The first ball valve 91 is open and the second ball valve 92 is closed; or the first ball valve 91 is closed and the second ball valve 92 is open.

[0061] By controlling the opening or closing of the two ball valves, the operation of different control pipelines is realized, which is convenient for temperature control of lithium battery packs and energy storage converters in high temperature and low temperature environments.

[0062] For details, see Figure 4 and Figure 5 As shown, when the lithium battery pack and energy storage converter are operating in summer or in a place with very high ambient temperature, the first ball valve 91 is opened, the second ball valve 92 is closed, the electric heater 11 is turned off, and the refrigeration cycle is started. The temperature control system is divided into two circuits, cooling the lithium battery pack and the energy storage converter respectively:

[0063] The high-temperature water / ethylene glycol solution in the battery pack coolant channel 7 exchanges heat with the refrigerant in the refrigeration cycle through the plate heat exchanger 2 under the action of the first water pump 5. The low-temperature coolant after heat exchange cools the lithium battery pack on the battery pack coolant channel 7 again, and the cycle continues;

[0064] The refrigerant in the refrigeration cycle exchanges heat with the coolant in the battery pack coolant channel 7 in the plate heat exchanger 2, absorbs heat, and evaporates to become a low-temperature, low-pressure gas. After passing through the compressor 1, it becomes a high-temperature, high-pressure gaseous refrigerant, enters the first heat exchanger 3, and is condensed into a high-temperature, high-pressure liquid by the first fan 31. The liquid refrigerant passes through the electronic expansion valve 10 and becomes a low-temperature, low-pressure liquid, which re-enters the plate heat exchanger 2, continuing the cycle.

[0065] Since the operating temperature range of the energy storage inverter is higher, a natural cold source is used to cool the energy storage inverter. The high-temperature return water passes through the second heat exchanger 4 under the action of the second water pump 6, and the temperature is reduced after heat exchange with the external air brought by the second fan 41. It is cooled again and enters the energy storage inverter coolant channel 8. The energy storage inverter coolant channel 8 cools the energy storage inverter thereon and circulates continuously.

[0066] See also Figure 4 and Figure 6 As shown, when the lithium battery pack and energy storage converter are operating in winter or in very low ambient temperatures, and the outside air temperature can meet the operating temperature requirements of both the battery pack and the energy storage converter, the first ball valve 91 is closed, the second ball valve 92 is opened, the electric heater 11 is turned off, and the refrigeration cycle is activated. The temperature control system is combined into a single loop, with the battery pack coolant channel 7 and the energy storage converter coolant channel 8 connected in series to share a common natural cooling system:

[0067] The high-temperature water / ethylene glycol solution flowing out of the energy storage inverter coolant channel 8 enters the second heat exchanger 4 under the action of the second water pump 6, and is cooled by heat exchange with the outside air guided by the second fan 41. Since the lithium battery pack is more sensitive to the operating temperature than the energy storage inverter, the low-temperature solution first enters the battery pack coolant channel 7 to cool the lithium battery pack on the battery pack coolant channel 7. After heat exchange, it becomes a lower temperature solution to cool the energy storage inverter. After heat exchange, it becomes a high-temperature solution and re-enters the second heat exchanger 4, and the cycle continues.

[0068] If the ambient temperature drops to a certain level, even if the lithium battery pack is working, the surrounding environment cannot reach the optimal operating temperature. In this case, the surrounding environment of the lithium battery pack needs to be changed. Figure 6 As shown, at this time, the first ball valve 91 is closed, the second ball valve 92 and the third ball valve 93 are open, the electric heater 11 is turned on, the second heat exchanger 4 and the second fan 41 are both turned off, and the heating cycle is started. The temperature control system is divided into two circuits. The battery pack coolant channel 7 uses the heating system, and the energy storage converter coolant channel 8 uses the natural cooling system:

[0069] The electric heater 11 allows the heated water / ethylene glycol solution to enter the battery pack coolant channel 7 to heat the battery pack on the battery pack coolant channel 7, and then the water / ethylene glycol solution is allowed to flow back into the electric heater 11 through the pipeline through the first water pump 5; the water / ethylene glycol solution flowing out of the energy storage inverter coolant channel 8 enters the second heat exchanger 4 under the action of the second water pump 6, exchanges heat and cools with the external air guided by the second fan 41, and re-enters the energy storage inverter coolant channel 8, and circulates continuously.

[0070] The two modes of this embodiment are switched by turning on and off the two ball valves.

[0071] When the temperature is high, the liquid cooling system and natural cooling can operate independently, and the refrigeration power consumption on the side of the energy storage inverter coolant channel 8 is relatively small; when the temperature is low, the refrigerant circulation in the liquid cooling system can be closed, and the coolant circulation on one side of the battery pack coolant channel 7 is connected in parallel with the coolant circulation of the energy storage inverter coolant channel 8, and the coolant does not converge. It can be selected whether to close the refrigerant circulation and operate in parallel. There are many operation control modes, and the circulation temperatures of the battery pack coolant channel 7 and the energy storage inverter coolant channel 8 can be controlled separately, which greatly reduces power consumption.

[0072] The liquid cooling system and the natural cooling system are independently turned on in different time periods, or the liquid cooling system and the natural cooling system are operated in parallel, which takes advantage of the natural cooling's low power dissipation and refrigeration, energy saving and environmental protection, simple maintenance and low cost in low temperature environments, thereby reducing the operating power consumption of the dual water outlet system.

[0073] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0074] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A dual water outlet system for parallel cooling of battery packs and energy storage converters, characterized in that: It comprises a compressor (1), a plate heat exchanger (2), a first heat exchanger (3), a second heat exchanger (4), a first water pump (5), a second water pump (6) and an electric heater (11); The coolant channel outlet of the plate heat exchanger (2) is communicated with the liquid supply port of the battery pack coolant channel (7) through the electric heater (11), and the liquid return port of the battery pack coolant channel (7) is communicated with the coolant channel inlet of the plate heat exchanger (2) through the first water pump (5); the exhaust port of the compressor (1) is communicated with the refrigerant channel inlet of the plate heat exchanger (2) through the first heat exchanger (3), and the refrigerant channel outlet of the plate heat exchanger (2) is communicated with the air inlet of the compressor (1); The outlet of the second heat exchanger (4) is connected to the liquid supply port of the energy storage converter coolant channel (8), and the liquid return port of the energy storage converter coolant channel (8) is connected to the inlet of the second heat exchanger (4) through the second water pump (6).

2. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1 is characterized in that: The outlet of the first water pump (5) is connected to the inlet of the coolant channel of the plate heat exchanger (2) through a first ball valve (91), the outlet of the first water pump (5) is connected to the inlet of the second heat exchanger (4) through a second ball valve (92), and the outlet of the second heat exchanger (4) is connected to the inlet of the electric heater (11) through a third ball valve (93); The first ball valve (91) is opened, and the second ball valve (92) and the third ball valve (93) are closed; or the first ball valve (91) is closed, and the second ball valve (92) and the third ball valve (93) are opened.

3. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1, characterized in that: The outlet of the first water pump (5) is communicated with the inlet of the coolant channel of the plate heat exchanger (2) through a first ball valve (91), and the outlet of the first water pump (5) is communicated with the inlet of the electric heater (11) through a second ball valve (92); The first ball valve (91) is opened and the second ball valve (92) is closed; or the first ball valve (91) is closed and the second ball valve (92) is opened.

4. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1, characterized in that: The outlet of the first heat exchanger (3) is connected to the refrigerant channel inlet of the plate heat exchanger (2) through an electronic expansion valve (10).

5. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1, characterized in that: The first heat exchanger (3) is provided with a first fan (31).

6. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1, characterized in that: The second heat exchanger (4) is provided with a second fan (41).

7. The dual water outlet system for parallel cooling of battery packs and energy storage converters according to claim 1, characterized in that: The coolant in the battery pack coolant channel (7) and the energy storage converter coolant channel (8) is water or ethylene glycol.

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