Liquid cooling system of energy storage unit

Abstract

The utility model belongs to the technical field of energy storage equipment, and discloses an energy storage unit liquid cooling system which comprises a heat exchange module and a heating module, the heat exchange module comprises a compressor, a first heat exchanger and a second heat exchanger, and the compressor, the first heat exchanger and the second heat exchanger are sequentially communicated end to end through a four-way valve to form a heat exchange loop. The heat exchange loop has a direct heating mode for heat absorption of the second heat exchanger and a direct cooling mode for heat release of the second heat exchanger, and the four-way valve can control the heat exchange module to be switched between the direct heating mode and the direct cooling mode; the heating module comprises a PTC heating piece and a fan assembly, the PTC heating piece is installed on one side of the second heat exchanger, and the fan assembly is used for conducting heat generated by the PTC heating piece to the second heat exchanger. The heating module is arranged to heat the refrigerant in the evaporator, so that the evaporation temperature and the evaporation pressure in the evaporator are increased, and the energy efficiency ratio of the whole machine is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage equipment technical field especially relates to a kind of energy storage unit liquid cooling system. BACKGROUND

[0002] With the vigorous development of energy storage industry, energy storage unit liquid cooling system is also widely used. Energy storage unit liquid cooling system is mainly responsible for cooling battery when battery pack charges and discharges, and heat is dissipated through condenser by medium. The relatively novel energy storage unit liquid cooling system on the market currently directly removes the traditional cooling liquid circuit, directly integrates battery cold plate into refrigerant refrigeration circuit, changes the original "water-water heat exchange" into direct heat exchange, so as to achieve the effect of reducing cost and improving heat dissipation efficiency. At the same time, in order to solve the operation problem of battery pack in cold environment, the liquid cooling system usually also needs to play a heating role. However, the direct cooling type liquid cooling system on the market directly heats the battery pack when the ambient temperature is low, the evaporation temperature of the system itself is low, the compressor efficiency is not high, which leads to low overall energy efficiency ratio and unsatisfactory heating effect. SUMMARY

[0003] The utility model aims at providing a kind of energy storage unit liquid cooling system, can improve evaporation temperature, improve compressor efficiency, and then improve overall energy efficiency ratio, guarantee heating effect.

[0004] To achieve this purpose, the utility model adopts the following technical scheme: an energy storage unit liquid cooling system includes a heat exchange module and a heating module, the heat exchange module includes a compressor, a first heat exchanger and a second heat exchanger, the compressor, the first heat exchanger and the second heat exchanger are sequentially communicated by a four-way valve to form a heat exchange circuit, the heat exchange circuit has a direct heating mode of heat absorption of the second heat exchanger and a direct cooling mode of heat release of the second heat exchanger, and the four-way valve can control the heat exchange module to switch between the direct heating mode and the direct cooling mode; the heating module includes a PTC heating element and a fan assembly, the PTC heating element is installed on one side of the second heat exchanger, and the fan assembly is used to conduct heat generated by the PTC heating element to the second heat exchanger.

[0005] As a preferred, the fan assembly is arranged on the side of the second heat exchanger away from the PTC heating element.

[0006] As a preferred, the energy storage unit liquid cooling system further includes an outer frame, and the compressor, the second heat exchanger, the four-way valve and the heating module are all installed in the outer frame.

[0007] As a preferred, the PTC heating element includes a mounting bracket and a PTC main body, the mounting bracket is arranged around the PTC main body and detachably connected with the outer frame.

[0008] Preferably, the mounting frame is in close contact with the side wall of the second heat exchanger.

[0009] Preferably, the mounting frame and the outer frame are bolted.

[0010] Preferably, the outer frame is provided with a support block, which is located below the mounting frame to support the mounting frame.

[0011] Preferably, in the horizontal direction, the compressor, the four-way valve and the PTC heating element are located on the same side of the second heat exchanger.

[0012] Preferably, the second heat exchanger and the PTC heating element are both arranged vertically.

[0013] Preferably, the fan assembly comprises a plurality of axial flow fans, which are arranged in a matrix type.

[0014] The beneficial effects of the utility model are as follows: when the liquid cooling system heats the battery pack, the second heat exchanger functions as an evaporator, at this time, the second heat exchanger absorbs heat from the surrounding environment to heat the refrigerant after heat exchange with the battery pack. By arranging the heating module, the PTC heating element and the fan assembly of the heating module are started when the heat exchange module is in the direct heating mode, the fan assembly conducts the heat generated by the PTC heating element to the surface of the evaporator, heats the refrigerant in the evaporator, thereby improving the evaporation temperature in the evaporator and the evaporation pressure corresponding to the compressor, thereby improving the working efficiency of the compressor, enabling the compressor capacity to be better exerted, achieving the effect of improving the overall efficiency ratio, and ensuring the heating effect of the liquid cooling system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the energy storage unit liquid cooling system of the utility model.

[0016] In the figure: 100, heat exchange module; 110, compressor; 120, second heat exchanger; 130, four-way valve; 200, heating module; 210, PTC heating element; 211, mounting frame; 212, PTC main body; 220, fan assembly; 300, outer frame; 310, support block. DETAILED DESCRIPTION

[0017] The utility model will be further described in detail in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all structures.

[0018] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0019] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0020] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0021] Referring to Figure 1 As shown in the figure, according to the energy storage unit liquid cooling system provided in the embodiment of the application, it comprises a heat exchange module 100 and a heating module 200, the heat exchange module 100 comprises a compressor 110, a first heat exchanger and a second heat exchanger 120, the compressor 110, the first heat exchanger and the second heat exchanger 120 are sequentially communicated through a four-way valve 130 to form a heat exchange circuit, the heat exchange circuit has a direct heating mode of heat absorption of the second heat exchanger 120 and a direct cooling mode of heat release of the second heat exchanger 120, and the four-way valve 130 can control the heat exchange module 100 to switch between the direct heating mode and the direct cooling mode.

[0022] Specifically, the water inlet end and the water outlet end of the compressor 110 are connected with the four-way valve 130, the water outlet end of the first heat exchanger and the water inlet end of the second heat exchanger 120 are connected with the four-way valve 130 respectively, and the water inlet end of the first heat exchanger and the water outlet end of the second heat exchanger 120 are connected through the expansion valve pipeline. The battery cold plate for heat exchange with the battery pack is connected into the above-mentioned refrigerant circuit through parallel connection, series connection and the like. The four-way valve 130 controls the heat exchange module 100 to enter the direct cooling mode, that is, the four-way valve 130 controls the control mode that the water outlet end of the compressor 110 is communicated with the water inlet end of the second heat exchanger 120 and the water inlet end of the compressor 110 is communicated with the water outlet end of the first heat exchanger. At this time, the first heat exchanger functions as an evaporator, the second heat exchanger 120 functions as a condenser, the refrigerant is heated and pressurized by the compressor 110, enters the second heat exchanger 120 to release heat and condense, and then is cooled and depressurized by the expansion valve, thereby forming a low-temperature and low-pressure liquid to refrigerate the battery cold plate. The refrigerant heated after heat exchange with the battery cold plate enters the evaporator to circulate, thereby realizing direct cooling of the battery pack. The four-way valve 130 controls the heat exchange module 100 to enter the direct heating mode, that is, the four-way valve 130 controls the control mode that the water outlet end of the compressor 110 is communicated with the water outlet end of the first heat exchanger (in the direct heating mode, the first heat exchanger is connected with the refrigerant through the water outlet end), and the water inlet end of the compressor 110 is communicated with the water inlet end of the second heat exchanger 120 (in the direct heating mode, the second heat exchanger 120 is connected with the refrigerant through the water inlet end). At this time, the first heat exchanger functions as a condenser, the second heat exchanger 120 functions as an evaporator, the refrigerant is heated and pressurized by the compressor 110, enters the first heat exchanger to refrigerate the battery cold plate, the refrigerant cooled after heat exchange with the battery cold plate enters the second heat exchanger 120 to release heat and be heated, thereby forming a medium-temperature and low-pressure liquid to circulate in the evaporator, thereby realizing direct heating of the battery pack.

[0023] The heating module 200 comprises a PTC heating element 210 and a fan assembly 220. The PTC heating element 210 is matched with the second heat exchanger 120 in shape, and is installed on one side of the second heat exchanger 120. The fan assembly 220 is used to conduct the heat generated by the PTC heating element 210 to the second heat exchanger 120.

[0024] It can be understood that the coolant circuit is omitted, and the refrigerant is directly used for refrigeration or heating of the battery pack. The problems such as leakage of corrosive coolant can be avoided, and the arrangement cost can be effectively reduced. When the liquid cooling system heats the battery pack (i.e., the four-way valve 130 controls the heat exchange module 100 to switch to the direct heating mode), the second heat exchanger 120 functions as an evaporator, at this time, the second heat exchanger 120 absorbs heat from the surrounding environment to heat the refrigerant after heat exchange with the battery pack. By setting the heating module 200, the PTC heating element 210 and the fan assembly 220 of the heating module 200 are started when the heat exchange module 100 is in the direct heating mode. The fan assembly 220 conducts the heat generated by the PTC heating element 210 to the surface of the evaporator, heats the refrigerant in the evaporator, thereby increasing the evaporation temperature in the evaporator, increasing the corresponding evaporation pressure of the compressor 110, thereby improving the working efficiency of the compressor 110, enabling the compressor 110 to better exert its capacity, achieving the effect of improving the overall efficiency ratio, and ensuring the heating effect of the liquid cooling system. In addition, compared with directly installing a PTC on the pipeline at the water inlet end of the second heat exchanger 120, installing a PTC heating element 210 matched with the outer shape of the second heat exchanger 120 on the side wall of the second heat exchanger 120 not only facilitates disassembly and assembly, but also effectively increases the heat exchange area and enhances the heating effect.

[0025] It should be noted that in order to avoid too fast wind speed, the heat of the PTC heating element 210 cannot be uniformly conducted to the second heat exchanger 120 in time, and the fan assembly 220 usually operates at the minimum wind speed. It is particularly stated here to avoid misunderstanding.

[0026] In some embodiments, the fan assembly 220 can be arranged on the side of the PTC heating element 210 away from the second heat exchanger 120 (the PTC heating element 210 has a hollow structure for airflow to pass through), at this time, the fan assembly 220 blows air towards the PTC heating element 210 to make the heat generated by the PTC heating element 210 conducted to the second heat exchanger 120.

[0027] In other embodiments, the fan assembly 220 can also be arranged on the side of the second heat exchanger 120 away from the PTC heating element 210, at this time, the fan assembly 220 blows air away from the PTC heating element 210 to make the heat generated by the PTC heating element 210 conducted to the second heat exchanger 120.

[0028] Arranging the fan assembly 220 on the side of the second heat exchanger 120 away from the PTC heating element 210, on the one hand, the fan assembly 220 does not need to occupy the inside space of the PTC heating element 210, facilitating the arrangement of the fan assembly 220; on the other hand, the fan assembly 220 can discharge heat when the second heat exchanger 120 functions as a condenser to dissipate heat when the four-way valve 130 controls the heat exchange module 100 to switch to the direct cooling mode, thereby improving the practicability of the fan assembly 220.

[0029] Referring to Figure 1 As shown, the energy storage unit liquid cooling system further comprises an outer frame 300. Optionally, the outer frame 300 is a frame structure formed by welding aluminum profiles and the like, and the compressor 110, the second heat exchanger 120, the four-way valve 130 and the heating module 200 are all installed in the outer frame 300.

[0030] By setting the mounting frame, the outer frame 300 can integrate and install the compressor 110, the second heat exchanger 120, the four-way valve 130 and the heating module 200, effectively improving the modular degree of the energy storage unit liquid cooling system, and facilitating subsequent installation and use of the energy storage unit liquid cooling system.

[0031] Among them, in the horizontal direction, the compressor 110, the four-way valve 130 and the PTC heating element 210 are located on the same side of the second heat exchanger 120, that is, the compressor 110 and the four-way valve 130 are located on the side of the PTC heating element 210 away from the second heat exchanger 120, and the four-way valve 130 is located above the compressor 110.

[0032] Arranging the compressor 110, the four-way valve 130 and the PTC heating element 210 on the same side of the second heat exchanger 120 in the outer frame 300 can effectively improve the space utilization rate in the outer frame and improve the integration degree of the energy storage unit liquid cooling system.

[0033] Further, the PTC heating element 210 comprises a mounting bracket 211 and a PTC main body 212, and the mounting bracket 211 is arranged around the PTC main body 212 and detachably connected with the outer frame 300. Optionally, the mounting bracket 211 and the outer frame 300 are detachably connected by screwing, clamping, locking and the like, and the mounting bracket 211 and the PTC main body 212 can be detachably connected by screwing, clamping, locking and the like, or can be directly welded and fixed, which will not be described here.

[0034] By setting the mounting bracket 211 detachably connected with the outer frame 300, the user can conveniently install or dismount the PTC heating element 210, effectively improving the convenience of mounting and dismounting the PTC heating element 210.

[0035] In this embodiment, the mounting bracket 211 and the outer frame 300 are bolted.

[0036] By bolting the mounting bracket 211, the mounting stability of the PTC heating element 210 is effectively improved without affecting the PTC heating element 210.

[0037] Further, the mounting bracket 211 is tightly attached to the side wall of the second heat exchanger 120 on the side facing the PTC heating element 210.

[0038] The mounting rack 211 is arranged close to the second heat exchanger 120, so that the gap between the second heat exchanger 120 and the PTC heating element 210 can be greatly reduced, the heat generated by the PTC heating element 210 can be prevented from being greatly lost in the conduction process, the heating effect of the PTC heating element 210 on the refrigerant in the second heat exchanger 120 can be affected, the heating efficiency of the PTC heating element 210 can be ensured, and the structural compactness of the energy storage unit liquid cooling system can be improved.

[0039] With reference to the Figure 1 It can be understood that the outer frame 300 is provided with a supporting block 310, and the supporting block 310 is arranged below the mounting rack 211 to support the mounting rack 211.

[0040] By arranging the supporting block 310, the supporting block 310 can support the PTC heating element 210 below the PTC heating element 210, so that the installation stability of the PTC heating element 210 can be effectively improved.

[0041] Further, the second heat exchanger 120 and the PTC heating element 210 are vertically arranged.

[0042] The second heat exchanger 120 and the PTC heating element 210 are vertically arranged, so that the width dimension of the outer frame 300 can be reduced, the four-way valve 130 and the pipelines between the four-way valve 130 and the second heat exchanger 120 and the compressor 110 can be arranged in the vertical space, the space utilization in the outer frame can be further improved, and the floor area of the energy storage unit liquid cooling system can be reduced.

[0043] Further, the fan assembly 220 comprises a plurality of axial flow fans, and the plurality of axial flow fans are arranged in a matrix type.

[0044] By arranging the plurality of axial flow fans, the plurality of axial flow fans can be matched, so that the flow area can be effectively improved, and the refrigerant at each position of the second heat exchanger 120 can be uniformly heated. In addition, even if the wind speed of a single axial flow fan is small, the plurality of axial flow fans can also guide the heat of the PTC heating element 210 to be uniformly and stably conducted to the second heat exchanger 120, so that the heating efficiency of the PTC heating element 210 can be ensured.

[0045] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A liquid cooling system for an energy storage unit, characterized in that, include: The heat exchange module (100) includes a compressor (110), a first heat exchanger, and a second heat exchanger (120). The compressor (110), the first heat exchanger, and the second heat exchanger (120) are connected end to end by a four-way valve (130) to form a heat exchange circuit. The heat exchange circuit has a direct heating mode in which the second heat exchanger (120) absorbs heat and a direct cooling mode in which the second heat exchanger (120) releases heat. The four-way valve (130) can control the heat exchange module (100) to switch between the direct heating mode and the direct cooling mode. The heating module (200) includes a PTC heating element (210) and a fan assembly (220). The PTC heating element (210) is installed on one side of the second heat exchanger (120), and the fan assembly (220) is used to conduct the heat generated by the PTC heating element (210) to the second heat exchanger (120).

2. The liquid cooling system for the energy storage unit according to claim 1, characterized in that, The fan assembly (220) is arranged on the side of the second heat exchanger (120) away from the PTC heating element (210).

3. The liquid cooling system for the energy storage unit according to claim 2, characterized in that, The liquid cooling system of the energy storage unit also includes an outer frame (300), and the compressor (110), the second heat exchanger (120), the four-way valve (130) and the heating module (200) are all installed inside the outer frame (300).

4. The liquid cooling system for the energy storage unit according to claim 3, characterized in that, The PTC heating element (210) includes a mounting bracket (211) and a PTC body (212), the mounting bracket (211) being arranged around the PTC body (212) and detachably connected to the outer frame (300).

5. The liquid cooling system for the energy storage unit according to claim 4, characterized in that, The mounting bracket (211) is attached to the side wall of the second heat exchanger (120).

6. The liquid cooling system for the energy storage unit according to claim 4, characterized in that, The mounting bracket (211) and the outer frame (300) are bolted together.

7. The liquid cooling system for an energy storage unit according to any one of claims 4-6, characterized in that, The outer frame (300) is provided with a support block (310), which is located below the mounting bracket (211) to support the mounting bracket (211).

8. The liquid cooling system for an energy storage unit according to any one of claims 1-6, characterized in that, In the horizontal direction, the compressor (110), the four-way valve (130) and the PTC heater (210) are located on the same side of the second heat exchanger (120).

9. The liquid cooling system for an energy storage unit according to any one of claims 1-6, characterized in that, The second heat exchanger (120) and the PTC heating element (210) are both arranged vertically.

10. The liquid cooling system for an energy storage unit according to claim 1, characterized in that, The fan assembly (220) includes multiple axial fans arranged in a matrix.

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