Energy storage heat management system

Abstract

The utility model discloses an energy storage heat management system, which relates to the technical field of heat management, and comprises a refrigeration module, an energy storage module and an energy storage module, the cooling module is used for providing cooling liquid circulation so as to cool the energy storage equipment; the evaporator communicates with the refrigeration module and the cooling module and exchanges heat with the refrigeration module and the cooling module, so that the refrigerant in the refrigeration module can cool the cooling liquid in the cooling module; wherein the energy storage equipment comprises a plurality of battery packs, the cooling module comprises a cooling liquid main pipeline and a plurality of branch pipelines, each branch pipeline is communicated with each battery pack to cool each battery pack, an electric control valve is arranged on the branch pipeline communicated with a liquid inlet of each battery pack, and a first temperature sensor is arranged on the cooling liquid main pipeline; the electric adjusting valve and the first temperature sensor are both in signal connection with the controller. According to the energy storage thermal management system, uniform control over the temperature of each battery pack is achieved, so that the temperature difference between the battery packs is reduced, and the charging and discharging efficiency of energy storage equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management, in particular to an energy storage thermal management system. Background Art

[0002] Thermal management refers to the management and control of the temperature of the overall system, discrete components or their environment, with the purpose of maintaining the normal operation of each component or improving its performance or life. Currently, thermal management is usually required in fields such as electrochemical energy storage, and thermal management has a significant impact on the performance, life and safety of energy storage systems.

[0003] The existing energy storage thermal management methods mainly include air cooling, liquid cooling and phase change material cooling. Air cooling technology has been widely used in the early development stage of the energy storage market due to its low cost and simple structure. Phase change material cooling has not been widely used due to its low thermal conductivity. As the capacity of battery energy storage systems increases, liquid cooling technology is gradually replacing air cooling technology to become the mainstream technology for battery thermal management systems. Conventional liquid cooling achieves temperature control by changing the cooling capacity of the overall refrigeration unit, resulting in a large temperature difference between the battery packs in the energy storage device, shortening the service life of the energy storage device and easily causing a certain risk of thermal runaway of the energy storage device.

[0004] Therefore, how to provide an energy storage thermal management system to avoid large temperature differences among battery packs in the energy storage device, improve the charging and discharging efficiency of the energy storage device, ensure the normal operation of the energy storage device, and prevent thermal runaway is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide an energy storage thermal management system, which solves the technical problem of large temperature differences between battery packs in existing energy storage devices.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an energy storage thermal management system, comprising:

[0007] a refrigeration module configured to provide a refrigerant cycle;

[0008] A cooling module configured to provide a coolant circulation to cool the energy storage device;

[0009] an evaporator, which is in communication with the refrigeration module and the cooling module and exchanges heat with each other, so that the refrigerant in the refrigeration module can cool the coolant in the cooling module;

[0010] Among them, the energy storage device includes a plurality of arranged battery packs, the cooling module includes a main coolant line and a plurality of branch lines, the main coolant line and the plurality of branch lines constitute a coolant circulation loop, a single branch line is connected to a single battery pack to cool the battery pack, an electric regulating valve is provided on the branch line connected to the liquid inlet of the battery pack, a plurality of first temperature sensors are provided on the main coolant line, and the electric regulating valve and the first temperature sensor both establish signal connections with the controller.

[0011] Preferably, the evaporator comprises a coolant pipeline and a refrigerant pipeline, the coolant pipeline comprises a first inlet and a first outlet, and the refrigerant pipeline comprises a second inlet and a second outlet.

[0012] Preferably, the cooling module also includes a circulating pump, a first stop valve and a second stop valve, the main coolant pipeline includes a coolant input pipeline and a coolant output pipeline, the coolant input pipeline is sequentially connected to the first inlet of the evaporator, the first stop valve and the liquid outlets of several branch pipelines, and the coolant output pipeline is sequentially connected to the first outlet of the evaporator, the circulating pump, the second stop valve and the liquid inlets of several branch pipelines.

[0013] Preferably, a heater is provided on the coolant output pipeline between the circulation pump and the first outlet of the evaporator.

[0014] Preferably, the refrigeration module includes a compressor, a condenser, a throttle valve, a refrigerant input pipeline and a refrigerant output pipeline, the refrigerant input pipeline is used to connect the output port of the condenser and the second inlet of the evaporator, the throttle valve is arranged on the refrigerant input pipeline, the refrigerant output pipeline is used to connect the input port of the condenser and the second outlet of the evaporator, and the compressor is arranged on the refrigerant output pipeline.

[0015] Preferably, a refrigerant addition port and a second temperature sensor are provided on the refrigerant input pipeline, and two groups of pressure sensors and a third temperature sensor are provided on the refrigerant output pipeline.

[0016] Preferably, the evaporator is an evaporator.

[0017] Preferably, a fan is provided on one side of the condenser for introducing air into the condenser to achieve heat exchange.

[0018] Compared with the above background technology, the energy storage thermal management system provided by the present invention has the following beneficial effects:

[0019] The circulating coolant of the cooling module cools the energy storage device. The cooperation of the refrigeration module and the evaporator can cool the coolant in the cooling module, and then circulate to cool the energy storage device. Since the energy storage device includes a plurality of arranged battery packs, a plurality of branch pipelines are set to be connected to the battery packs one by one to achieve cooling of each battery pack. Since a plurality of first temperature sensors are provided on the main coolant pipeline, an electric regulating valve is provided on the branch pipeline connected to the battery pack inlet. When the monitoring value of the first temperature sensor is greater than the maximum threshold, the controller increases the opening of each electric regulating valve to increase the flow of coolant entering the battery pack. When the monitoring value of the first temperature sensor is less than the minimum threshold, the controller decreases the opening of each electric regulating valve to decrease the flow of coolant entering the battery pack, thereby achieving uniform control of the temperature of each battery pack, thereby reducing the temperature difference between the battery packs, improving the charging and discharging efficiency of the energy storage device, ensuring the normal operation of the energy storage device, and increasing the service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of an energy storage thermal management system provided by an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the branch pipeline and battery pack structure provided in an embodiment of the utility model.

[0023] in:

[0024] 1- refrigeration module, 2- cooling module, 3- energy storage device, 4- evaporator;

[0025] 11- compressor, 12- condenser, 13- throttle valve, 14- refrigerant input pipeline, 15- refrigerant output pipeline, 16- refrigerant addition port, 17- second temperature sensor, 18- pressure sensor, 19- third temperature sensor;

[0026] 21-branch pipeline, 22-electric regulating valve, 23-first temperature sensor, 24-circulating pump, 25-first stop valve, 26-second stop valve, 27-coolant input pipeline, 28-coolant output pipeline, 29-heater;

[0027] 31-Battery pack. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] See also Figure 1-Figure 2 , the present application provides an energy storage thermal management system, comprising:

[0031] A refrigeration module 1, which is configured to provide a refrigerant cycle;

[0032] A cooling module 2, which is configured to provide a coolant circulation to cool the energy storage device 3;

[0033] an evaporator 4, which is in communication with the refrigeration module 1 and the cooling module 2 respectively and exchanges heat with each other, so that the refrigerant in the refrigeration module 1 can cool the coolant in the cooling module 2;

[0034] Among them, the energy storage device 3 includes a plurality of arranged battery packs 31, the cooling module 2 includes a cooling liquid main line and a plurality of branch lines 21, the cooling liquid main line and the plurality of branch lines 21 constitute a cooling liquid circulation loop, a single branch line 21 is connected to a single battery pack 31 to cool the battery pack 31, an electric regulating valve 22 is provided on the branch line 21 connected to the liquid inlet of the battery pack 31, and a plurality of first temperature sensors 23 are provided on the cooling liquid main line. Specifically, the first temperature sensor 23 is used to measure the temperature of the cooling liquid after cooling the battery pack 31, and the electric regulating valve 22 and the first temperature sensor 23 both establish signal connections with the controller.

[0035] That is to say, through the use of the energy storage thermal management system of the present application, the circulating coolant of the cooling module 2 cools the energy storage device 3, and the cooperation of the refrigeration module 1 and the evaporator 4 can cool the coolant in the cooling module 2, and then circulate to cool the energy storage device 3. Since the energy storage device 3 includes a plurality of battery packs 31 arranged in an array, a plurality of branch pipes 21 are provided to be connected one by one with the battery packs 31 to achieve cooling of each battery pack 31. Since a plurality of first temperature sensors 23 are provided on the main coolant pipe, an electric regulating valve 22 is provided on the branch pipe 21 connected to the liquid inlet of the battery pack 31. When the monitoring value of the first temperature sensor 23 is large, the electric regulating valve 22 is provided on the branch pipe 21 connected to the liquid inlet of the battery pack 31. When the maximum threshold is reached, the controller widens the opening of each electric regulating valve 22 to increase the flow of coolant entering each battery pack 31. When the monitoring value of the first temperature sensor 23 is less than the minimum threshold, the controller narrows the opening of each electric regulating valve 22 to reduce the flow of coolant entering each battery pack 31. Since the adjustment range of each electric regulating valve 22 is consistent, the temperature of each battery pack 31 can be uniformly controlled to reduce the temperature difference between each battery pack 31, so that each battery pack 31 is within a safe operating temperature range, thereby improving the charging and discharging efficiency of the energy storage device 3, ensuring the normal operation of the energy storage device 3, and increasing the service life of the energy storage device 3.

[0036] Based on the above embodiment, the evaporator 4 includes a coolant pipeline and a refrigerant pipeline. The coolant pipeline includes a first inlet and a first outlet, and the refrigerant pipeline includes a second inlet and a second outlet. Specifically, the evaporator 4 directly uses existing mature technology.

[0037] Based on the above embodiment, the cooling module 2 also includes a circulating pump 24, a first stop valve 25 and a second stop valve 26, and the main coolant pipeline includes a coolant input pipeline 27 and a coolant output pipeline 28. The coolant input pipeline 27 is connected to the first inlet of the evaporator 4, the first stop valve 25 and the liquid outlets of several branch pipelines 21 in sequence, and the coolant output pipeline 28 is connected to the first outlet of the evaporator 4, the circulating pump 24, the second stop valve 26 and the liquid inlets of several branch pipelines 21 in sequence.

[0038] Specifically, the number of battery packs 31 is the same as the number of branch pipelines 21. Five battery packs 31 are arranged in the energy storage device 3 of the present application, and thus the number of branch pipelines 21 is also 5. The liquid inlets of the five branch pipelines 21 are connected to the coolant output pipeline 28 through a five-way valve, and the liquid outlets of the five branch pipelines 21 are connected to the coolant input pipeline 27 through a five-way valve, thereby forming a circulation channel for the coolant.

[0039] That is to say, the circulating pump 24 is configured to provide power for the coolant in the cooling module 2 so that the coolant circulates in the cooling module 2, and the first stop valve 25 and the second stop valve 26 correspondingly realize the opening or closing of the coolant input pipeline 27 and the coolant output pipeline 28.

[0040] Specifically, there are two first temperature sensors 23, one is arranged on the coolant input pipeline 27, and is used to measure the coolant temperature after cooling the battery pack 31, that is, the coolant temperature before entering the evaporator 4, and the other is arranged on the coolant output pipeline 28, and is used to measure the temperature of the coolant after refrigeration.

[0041] Specifically, the circulation pump 24 is a variable frequency pump, and the circulation pump 24 is electrically connected to the controller.

[0042] Specifically, an infrared thermometer is provided in the energy storage device 3, and a signal connection is established between the infrared thermometer and the controller to monitor the temperature of the battery pack 31 of the energy storage device 3. By using the infrared thermometer, the temperature of the battery pack 31 can be accurately monitored in real time. When the monitored value is greater than the maximum threshold value, the controller increases the operating frequency of the circulation pump 24, accelerates the rotation speed of the circulation pump 24, and speeds up the flow rate of the coolant to improve the cooling effect; when the monitored value is less than the minimum threshold value, the controller reduces the operating frequency of the circulation pump 24, reduces the rotation speed of the circulation pump 24, reduces the flow rate of the coolant, and reduces the cooling effect, so that the temperature of the battery pack 31 is within a safe operating temperature range.

[0043] On the basis of the above embodiment, a heater 29 is provided on the coolant output pipeline 28 between the circulation pump 24 and the first outlet of the evaporator 4, and the heater 29 establishes a signal connection with the controller.

[0044] Specifically, when the monitored value is less than the minimum threshold, the refrigeration module 1 stops working and the heater 29 is turned on to heat the coolant and increase the temperature of the coolant so that the temperature of the battery pack 31 is within a safe operating temperature range.

[0045] Specifically, the pipes in the energy storage device 3 are provided with heat-insulating materials to prevent the hot air in the energy storage device from contacting the pipes to generate condensation, thereby eliminating the risk of short circuit in the thermal management system caused by condensed water.

[0046] Based on the above embodiment, the refrigeration module 1 includes a compressor 11, a condenser 12, a throttle valve 13, a refrigerant input pipeline 14 and a refrigerant output pipeline 15. The refrigerant input pipeline 14 is used to connect the output port of the condenser 12 and the second inlet of the evaporator 4. The throttle valve 13 is arranged on the refrigerant input pipeline 14. The refrigerant output pipeline 15 is used to connect the input port of the condenser 12 and the second outlet of the evaporator 4. The compressor 11 is arranged on the refrigerant output pipeline 15.

[0047] On the basis of the above embodiment, a refrigerant addition port 16 and a second temperature sensor 17 are provided on the refrigerant input pipeline 14 , and two groups of pressure sensors 18 and a third temperature sensor 19 are provided on the refrigerant output pipeline 15 .

[0048] Specifically, the refrigerant is fluorine.

[0049] Based on the above embodiment, a fan is provided on one side of the condenser 12 for introducing air into the condenser 12 to achieve heat exchange. Specifically, the cooling of the condenser 12 is achieved by the fan, and the cooling can also be achieved by a cooling tower in combination with cooling water.

[0050] Specifically, the condenser 12, the fan, the compressor 11, the throttle valve 13, the second temperature sensor 17, the pressure sensor 18 and the third temperature sensor 19 are all connected to the controller by signals.

[0051] That is to say, the first temperature sensor 23 arranged on the coolant input pipeline 27 is used to measure the coolant temperature after cooling the battery pack 31, that is, the coolant temperature before entering the evaporator 4. Another first temperature sensor 23 arranged on the coolant output pipeline 28 is used to measure the temperature of the coolant after cooling. When the coolant temperature after cooling is met, the fan operating frequency can be adjusted according to the coolant temperature controller before entering the evaporator 4 to reduce the operating power consumption of the refrigeration module.

[0052] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0053] This article uses specific examples to illustrate the principle and implementation of an energy storage thermal management system provided by the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An energy storage thermal management system, characterized in that: include: A refrigeration module (1) configured to provide a refrigerant cycle; A cooling module (2) configured to provide a cooling liquid circulation to cool the energy storage device (3); an evaporator (4), which is respectively in communication with the refrigeration module (1) and the cooling module (2) and performs heat exchange therewith, so that the refrigerant in the refrigeration module (1) can cool the coolant in the cooling module (2); The energy storage device (3) comprises a plurality of battery packs (31) arranged in an array, the cooling module (2) comprises a cooling liquid main line and a plurality of branch lines (21), the cooling liquid main line and the plurality of branch lines (21) constitute a cooling liquid circulation loop, a single branch line (21) is connected to a single battery pack (31) to cool the battery pack (31), an electric regulating valve (22) is provided on the branch line (21) connected to the liquid inlet of the battery pack (31), a plurality of first temperature sensors (23) are provided on the cooling liquid main line, and the electric regulating valve (22) and the first temperature sensor (23) are both connected to a controller by signal.

2. The energy storage thermal management system according to claim 1, characterized in that: The evaporator (4) comprises a cooling liquid pipeline and a refrigerant pipeline, the cooling liquid pipeline comprises a first inlet and a first outlet, and the refrigerant pipeline comprises a second inlet and a second outlet.

3. The energy storage thermal management system according to claim 2, characterized in that: The cooling module (2) further comprises a circulation pump (24), a first stop valve (25) and a second stop valve (26); the main cooling liquid pipeline comprises a cooling liquid input pipeline (27) and a cooling liquid output pipeline (28); the cooling liquid input pipeline (27) is sequentially connected to a first inlet of the evaporator (4), the first stop valve (25) and a plurality of liquid outlets of the branch pipelines (21); the cooling liquid output pipeline (28) is sequentially connected to a first outlet of the evaporator (4), the circulation pump (24), the second stop valve (26) and a plurality of liquid inlets of the branch pipelines (21).

4. The energy storage thermal management system according to claim 3, characterized in that: A heater (29) is provided on the coolant output pipeline (28) between the circulation pump (24) and the first outlet of the evaporator (4).

5. The energy storage thermal management system according to claim 2, characterized in that: The refrigeration module (1) comprises a compressor (11), a condenser (12), a throttle valve (13), a refrigerant input pipeline (14) and a refrigerant output pipeline (15); the refrigerant input pipeline (14) is used to connect the output port of the condenser (12) and the second inlet of the evaporator (4); the throttle valve (13) is arranged on the refrigerant input pipeline (14); the refrigerant output pipeline (15) is used to connect the input port of the condenser (12) and the second outlet of the evaporator (4); and the compressor (11) is arranged on the refrigerant output pipeline (15).

6. The energy storage thermal management system according to claim 5, characterized in that: The refrigerant input pipeline (14) is provided with a refrigerant addition port (16) and a second temperature sensor (17), and the refrigerant output pipeline (15) is provided with two groups of pressure sensors (18) and a third temperature sensor (19).

7. The energy storage thermal management system according to claim 6, characterized in that: A fan is provided on one side of the condenser (12) for introducing air into the condenser (12) to achieve heat exchange.

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