Low-power-consumption air-cooled liquid cooling and heating management system structure

Abstract

The utility model discloses a low-power-consumption air-cooled liquid cold and heat management system structure, which comprises a cold plate liquid cooling structure, a ventilation structure, a ventilation pipeline structure and an exhaust structure which are arranged on a battery pack, the cold plate liquid cooling structure comprises a cooling plate, and the cooling plate is used for cooling or heating the battery pack; the ventilation structure comprises a front end plate and a rear end plate, the front end plate is provided with a front end plate through hole, the rear end plate is provided with a rear end plate ventilation hole, and the front end plate and the rear end plate are located at the two ends of the battery pack respectively; the ventilation pipeline structure comprises a ventilation pipe, the end of the ventilation pipe is connected with a ventilation hole of the rear end plate, the exhaust structure comprises a fan, the fan is located at the tail end of the ventilation pipe and in front of a switchable double-channel air outlet, and when the energy storage battery pack needs heat dissipation, the fan works, air is pumped out along the ventilation pipe, and heat dissipation and temperature equalization of the battery pack are achieved. When the energy storage battery pack needs to be heated, the fan works, the liquid cooling plate is heated, the double-channel air outlet is switched into the equipment, and heat generated by the equipment is internally circulated. And the effect of reducing the energy consumption of the equipment is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the thermal management technical field of energy storage system, concretely relates to a low -power's air -cooled liquid cooling thermal management system structure. BACKGROUND

[0002] With the proposal of the "double carbon" goal and the continuous development of the new energy storage industry, lithium ion battery energy storage systems are also developing towards greater power, higher energy density, longer cycle life and greater safety, and the heat generation power of lithium ion battery energy storage systems has also increased exponentially. If the internal heat dissipation of the energy storage system cannot be effectively carried out, the battery temperature will be too high, which will cause the battery power to decrease, and further cause the electrochemical reaction of the battery to be unstable, accelerate the attenuation of the battery life, and even cause the battery to be out of control, cause the battery to catch fire, and cause serious safety accidents. Therefore, an efficient thermal management system in the battery energy storage system is an important factor in determining its stable and safe operation. Early lithium ion battery monomers had small capacity and low energy density, and the thermal management system of the lithium ion energy storage system was relatively simple, mainly relying on air natural convection heat dissipation, i.e. passive air cooling. Later, fans were added to speed up air flow or cold air tanks were used to cool air in advance, i.e. active air cooling, and the cooling effect was improved, but the fan noise was large, and the battery temperature was not uniform, which still limited the application of air cooling technology. In order to solve the problems existing in air cooling, researchers have developed liquid cooling technology, which mainly includes cooling plate liquid cooling and immersion liquid cooling. The cooling plate liquid cooling technology uses water-glycol as the medium, and the battery heat is transferred to the cooling medium through the contact between the cooling plate liquid cooling structure and the bottom of the battery. The cooling plate liquid cooling technology is relatively mature, and the cooling effect is good, but it cannot directly cool the heat generating components, the battery temperature uniformity is poor, and it is easy to cause safety hazards such as cooling liquid leakage; immersion liquid cooling is a cooling technology developed in recent years. When the battery module is immersed in the tank filled with cooling liquid, when the battery module is fast charged and fast discharged, a large amount of heat is generated, and the cooling liquid is used to quickly absorb the heat to stabilize the temperature of the battery module, and is circulated to the external cooling radiator for heat dissipation. Immersion cooling liquid mainly includes fluorinated liquid, mineral oil, synthetic oil, silicone oil, etc., among which fluorinated liquid has no color, no smell, stable insulation, and chemical inertness, and excellent comprehensive performance, but its high price and environmental hazards restrict its application in energy storage thermal management. Mineral oil and synthetic oil have the advantages of high boiling point, non-corrosion, environmental friendliness and low cost, but they have poor material compatibility and are not resistant to high pressure. Silicone oil is not biodegradable, has high viscosity and poor heat dissipation capacity, and has low cost performance.

[0003] In an existing liquid cooling, air cooling heat dissipation combined cooling cabinet and cooling system, patent application number 201911235618.5, a liquid cooling, air cooling heat dissipation combined cooling cabinet and cooling system is provided, which includes the following components: a cabinet body with a cabinet door; a liquid cooling server, which is arranged inside the cabinet body, and is connected with a main liquid inlet pipe and a main liquid outlet pipe; a first plate heat exchanger, which is arranged on one side of the liquid cooling server, and is connected with a first liquid inlet pipe and a first liquid outlet pipe; a second plate heat exchanger, which is arranged on the opposite side of the liquid cooling server relative to the first plate heat exchanger, and is connected with a second liquid inlet pipe and a second liquid outlet pipe; and a plurality of cross-flow fans, which are arranged on opposite sides of the liquid cooling server, so as to transmit the heat generated by the liquid cooling server to the first plate heat exchanger and the second plate heat exchanger for cooling. The structure has large power consumption, complex structure and high manufacturing cost. In particular, in the field of battery pack technology, the cooling cannot be effectively realized.

[0004] In an existing thermal management system and energy storage system, patent number CN 220527028 U, a thermal management system and energy storage system are disclosed, the thermal management system includes a plurality of water coolers for dissipating the heat of the heat exchanger, and the heat comes from the electrochemical device; wherein the plurality of water coolers include a first water cooler and a second water cooler; when the first water cooler is in a working state, the second water cooler is in a non-working state, and when the first water cooler is in a non-working state, the second water cooler switches to a working state. In this scheme, only liquid cooling can be used for cooling, the application range is small, and the practicality is not strong. Utility model content

[0005] The utility model aims at solving the above problems, providing a kind of low power consumption, integrated air cooling and liquid cooling function, can effectively improve the large-area cold dew when liquid cooling environment humidity is higher, reduce the risk of system insulation failure caused by battery pack condensation.

[0006] To solve the above technical problems, the technical scheme of the utility model is: a low-power air-cooled liquid cooling thermal management system structure, which comprises a cold plate liquid cooling structure, a battery pack ventilation structure, a ventilation duct structure and an exhaust structure installed at the bottom of the battery pack, the cold plate liquid cooling structure comprises a cooling plate, the cooling plate has a thermal management function of cooling or heating the battery pack, the ventilation structure comprises a battery pack front end plate and a rear end plate ventilation hole design, the front end plate lower portion is provided with a front end plate through hole, the rear end plate upper portion is provided with a rear end plate ventilation hole, and the front end plate and the rear end plate are respectively located at the two ends of the battery pack, the ventilation duct structure comprises a battery pack rear end ventilation hole connecting structure and a main ventilation pipe, the battery pack rear end ventilation hole connecting structure is connected with the rear end plate ventilation hole, the exhaust structure comprises a fan and a switchable double-channel air outlet structure, the fan is located at the top of the main ventilation pipe, when the fan works, air flows along the ventilation pipe and is discharged by the fan, the switchable double-channel air outlet structure discharges air to the external environment at one place and discharges air to the internal environment of the energy storage equipment at the other place, and the battery pack can realize rapid temperature equalization.

[0007] Preferably, the cooling plate is an "S" type circulating flow channel, the inside of the flow channel is filled with medium, the medium is a mixed solution of polyethylene glycol and pure water, and the medium supports heating in a -20 DEG C environment.

[0008] Preferably, the first connecting plate is a top cover plate, the second connecting plate is a side connecting plate, the number of the side connecting plates is two, and the bottom plate is the cooling plate. The two second connecting plates are located at the side of the battery pack, the side of the first connecting plate and the side of the second connecting plate are connected, the first connecting plate, the liquid cooling plate and the two second connecting plates form a cuboid structure, and the two ends of the first connecting plate are connected with the front end plate and the rear end plate respectively. The two ends of the second connecting plate are connected with the front end plate and the rear end plate respectively.

[0009] Preferably, a protective grid is additionally arranged on the front end plate through hole.

[0010] Preferably, the rear end plate ventilation hole is additionally provided with a circular-arc-shaped air duct interface, the length of the circular-arc-shaped air duct interface is slightly longer than that of the rear end plate ventilation hole, a rubber gasket is additionally arranged between the ventilation hole and the circular-arc-shaped air duct interface, the circular-arc-shaped air duct interface is fixed by a bolt, and the circular-arc-shaped air duct interface is communicated with the end of the ventilation pipe.

[0011] Preferably, the battery pack is in a rectangular structure, the battery pack needs to be kept 3-10 DEG C higher at the rear end than at the front end during installation, so that air flow is gathered to the rear end of the battery pack, and the battery pack can still form effective air circulation without external power.

[0012] Preferably, the outer surface of the ventilation pipe is covered with a heat preservation material, preferably polyurethane foam, so that the external ventilation duct is heat preserved, and heat loss is reduced when ventilation and heating are needed.

[0013] Preferably, the air outlet of the fan is provided with a switchable double-channel air outlet structure, the double-channel air outlet structure comprising two air outlet channels, namely an internal environment air outlet of the energy storage device and an external environment air outlet of the energy storage device, and an electromagnetic reversing valve is installed in the double-channel air outlet structure, the electromagnetic reversing valve controlling the on-off state of the corresponding air outlet, the internal environment air outlet of the energy storage device being in a normally open state, and the passage of the ventilation pipe being closed to the external environment air outlet of the energy storage device; when the internal temperature of the battery pack is high and the cooling plate needs to be turned on for cooling, the internal channel of the internal environment air outlet of the energy storage device is closed and the channel of the external environment air outlet of the energy storage device is opened by controlling the electromagnetic reversing valve, so that the ventilation pipe is communicated with the external environment air outlet of the energy storage device, the rapid exhaust of hot air flow in the battery pack is accelerated, rapid cooling and uniform temperature effect are realized; when the internal temperature of the battery pack is low and the cooling plate needs to be heated, or the internal temperature of the battery pack does not exceed the critical temperature of refrigeration, the electromagnetic reversing valve is controlled at this time so that the internal environment air outlet of the energy storage device is normally open and the external environment air outlet of the energy storage device is closed, the rapid circulation of hot air flow in the battery pack is accelerated, the rapid uniform temperature effect of each single cell of different battery packs is realized, and the energy loss of the system is reduced.

[0014] The utility model has the advantages of:

[0015] 1. The low-power air-cooled liquid-cooled thermal management system structure is simple in structure, high in compatibility, applicable to single-cluster industrial and commercial energy storage systems, and also applicable to multi-cluster centralized energy storage.

[0016] 3. The utility model utilizes the communication between the rear end of the battery pack and the external ventilation duct, utilizes the thermal field chimney effect of battery heat generation in the charging and discharging process of the battery pack to automatically guide the heat flow or forcibly guide the flow by the axial flow fan at the end of the air duct, realizes the heat exchange inside and outside the battery pack through the switchable double-channel air outlet structure.

[0017] 4、The utility model aims at overcoming the shortcoming that each module needs to be configured with heat exchange fan, fan equipment is much and energy consumption is high in prior single air cooling technology, also overcomes the shortcoming that temperature difference between the pole of electric core and the bottom of electric core is big and temperature is uneven in single liquid cooling plate cooling technology, can effectively improve large area cold dew when liquid cooling environment humidity is higher, reduces the risk of system insulation failure caused by battery pack condensation. Compared with prior air cooling technology, single air cooling technology, module level configuration fan, fan equipment is much, noise is big, energy consumption is higher, operation and maintenance are difficult, the utility model discloses can realize battery whole cluster level unified air cooling heat dissipation, fan equipment quantity reduces, noise reduces, energy consumption reduces, battery temperature control is even, compared with prior liquid cooling technology, single cooling plate liquid cooling technology, temperature difference between the bottom of battery and the pole is big, and the module bottom plate liquid cooling plate of the module air tightness of bad module is easy to occur obvious condensation in the cooling process, reduces battery insulation performance, and there is a security risk, the heat management system that the utility model discloses air cooling liquid cooling is combined can reduce air tightness requirement in the process of battery pack production and manufacturing, and the continuous air cooling mode can effectively alleviate the condensation phenomenon in the battery pack, guarantee the stable operation of energy storage system. The heat management system that the utility model discloses air cooling liquid cooling is combined, compared with single air cooling technology, the module is without fan design, and the grouping volume utilization rate of module is higher, and the technical scheme of the utility model is suitable for the integrated mode of different modules, and the volume energy density of module can be improved.

[0018] 5、The utility model discloses air cooling liquid cooling combined heat management system, battery pack rear end elevates the design, is favorable to the hot air flow in the battery pack inside gathering in the battery pack rear end. For triggering the battery pack of heat runaway, combustible gas detection device is located at the place where the air flow of battery pack rear end concentrates, and the induction of flue gas is more sensitive, and the design of effective smoke exhaust; the protection of heat runaway is actively protected. The utility model discloses air cooling liquid cooling combined heat management system, simple structure, strong compatibility, can be applicable to different capacity's industrial and commercial energy storage system and large energy storage container, low cost, low energy consumption, and the effect of heat dissipation isomorphism is remarkable, and the charging and discharging efficiency of energy storage system is improved. ACCURACY

[0019] Figure 1 It is a low-power air cooling liquid cooling heat management system structure structure schematic drawing of the utility model;

[0020] Figure 2 It is the front view of the utility model;

[0021] Figure 3 It is the rear view of the utility model;

[0022] Figure 4 It is the structure schematic drawing of cooling plate of the utility model;

[0023] Figure 5is a structure schematic diagram of the utility model for use;

[0024] Figure 6 is a front view of the utility model for use;

[0025] Figure 7 is a lateral structure schematic diagram of the utility model for use;

[0026] Figure 8 is a structure schematic diagram of the utility model double channel air outlet structure;

[0027] Figure 9 is a structure schematic diagram of the utility model fan.

[0028] Mark explanation: 1, cold plate liquid cooling structure;2, ventilation structure;3, ventilation duct structure;4, exhaust structure;11, cooling plate;21, front end plate;22, rear end plate;23, first connecting plate;24, second connecting plate;31, ventilation pipe;41, fan;42, axial flow fan installation position;43, double channel air outlet structure;44, electromagnetic reversing valve;111, cooling plate import;112, cooling plate export;211, front end plate vent;221, rear end plate vent;431, energy storage equipment internal environment air vent;432, energy storage equipment external environment air vent. Specific implementation

[0029] The utility model makes further explanation in connection with the drawings and specific embodiment:

[0030] As Figures 1 to 9 Indicated, the utility model provides a kind of low-power air-cooled liquid cooling thermal management system structure, including the cold plate liquid cooling structure 1, ventilation structure 2, ventilation duct structure 3 and exhaust structure 4 installed on battery pack, the cold plate liquid cooling structure 1 includes cooling plate 11, and the internal circulation water flow passage of cooling plate 11 is capsular type, and water inlet hole is smaller, and inside is larger, and internal flow passage is "S" type distribution;Cooling plate 11 carries out temperature reduction or temperature rise to battery pack.The ventilation structure 2 includes front end plate 21 and rear end plate 22, and front end plate 21 is equipped with front end plate vent 211 in lower part, and rear end plate 22 upper part is equipped with rear end plate vent 221, and front end plate 21 and rear end plate 22 are located at the both ends of battery pack respectively.The ventilation duct structure 3 includes ventilation pipe 31, and the end of ventilation pipe 31 is connected with rear end plate vent 221, and exhaust structure 4 includes fan 41, and fan 41 is located at the end of ventilation pipe 31, and fan 41 works, and air is extracted along ventilation pipe 31, and realizes temperature reduction to battery pack.In this embodiment, fan 41 is axial flow fan.

[0031] The cooling plate 11 is an "S" type circulating flow channel structure, the inside of the flow channel is filled with medium, the medium is a mixed solution of polyethylene glycol and pure water, and is heated in a -20 DEG C environment. In this embodiment, the battery pack is an existing energy storage system, and needs to be heated and warmed up. The most suitable operating temperature of the battery pack is 15-35 DEG C. When the ambient temperature is very low, the bottom plate of the liquid cooling plate needs to be heated to achieve the effect of warming up the battery pack. The two ends of the cooling plate 11 are provided with liquid cooling plate water nozzles, which are directly connected with the existing liquid cooling machine control pipeline. When the liquid cooling machine works, the heat management effect of heat dissipation or warming of the battery pack is realized.

[0032] The cooling plate 11 is provided with a cooling plate inlet 111 and a cooling plate outlet 112. The cooling plate inlet 111 is communicated with the existing liquid cooling machine outside, and provides liquid for the inside of the cooling plate 11. The cooling plate outlet 112 is communicated with the existing recycling device outside, and the liquid flows out from the cooling plate outlet 112 and is recycled, so that the flow and cooling of the liquid are realized. When warming up is needed, the liquid cooling machine is replaced by the existing liquid heating equipment, and the heating liquid is provided for the cooling plate 11 by the existing equipment, so that the warming up is realized, thereby increasing the practicability of the utility model.

[0033] The first connecting plate 23 and the second connecting plate 24 are arranged between the front end plate 21 and the rear end plate 22. The first connecting plate 23 is two in number, and the first connecting plate 23 and the second connecting plate 24 are both designed without openings. The two first connecting plates 23, the second connecting plate 24 and the cooling plate 11 constitute a cuboid structure of the battery pack. The two ends of the first connecting plate 23 are respectively connected with the front end plate 21 and the rear end plate 22, and the two ends of the second connecting plate 24 are respectively connected with the front end plate 21 and the rear end plate 22. The first connecting plate 23 and the second connecting plate 24 are fixedly connected as an integral structure, and the connecting part of the first connecting plate 23 and the second connecting plate 24 does not leak gas. In actual use, the first connecting plate 23 and the second connecting plate 24 can be formed by bending sheet metal.

[0034] The protective grid is arranged on the front end plate through hole 211, and the protective grid is in a rectangular grid structure.

[0035] The rear end plate vent hole 221 is provided with a circular arc shaped air duct interface 222, and the length of the circular arc shaped air duct interface 222 is longer than the diameter of the rear end plate vent hole 221. A rubber gasket is arranged on the circular arc shaped air duct interface 222, and the circular arc shaped air duct interface is fixed to the rear end plate 22 by bolts. The circular arc shaped air duct interface is communicated with the end of the ventilation pipe 31. The circular arc shaped air duct interface 222 is a column structure, the cross section of the circular arc shaped air duct interface 222 is in a circular arc shape, the bottom of the circular arc shaped air duct interface 222 is an open structure, the circular arc shaped air duct interface 222 is arranged on the rear end plate vent hole 221, and the middle part of the circular arc shaped air duct interface 222 is communicated with the ventilation pipe 31 through a pipeline.

[0036] In the embodiment, the battery pack is a mature existing energy storage device, the battery pack has a rectangular structure, the rear end of the battery pack is higher than the front end by 5 degrees when the battery pack is installed, so that air flow is gathered to the rear end of the battery pack, and the battery pack can still form effective air circulation without external power. Good temperature equalization effect is realized on the internal and external environment of the battery pack without external power. At the same time, if thermal runaway occurs in the battery pack, the combustible gas, hydrogen and carbon monoxide in the battery pack will also be gathered to the rear end of the battery pack, which is beneficial to the combustible gas detection device to trigger an alarm in time and plays a safety protection role. The utility model can also play a role in smoke and explosion exhaust.

[0037] The outer surface of the ventilation pipe 31 is covered with a heat preservation material, preferably polyurethane foam. The ventilation pipe 31 is an external ventilation pipe, and the external ventilation pipe is heat-insulated to reduce heat loss when ventilation and heating are needed.

[0038] The air flow at the rear end of the battery pack is gathered and led out, and is connected with the external ventilation pipe 31. The heat preservation of the external ventilation pipe mainly aims to reduce heat loss when the system needs ventilation and heating. When thermal runaway occurs in the battery pack and the battery cell explosion valve is broken, the combustible gas in the battery pack can be led out in time. The purpose of explosion prevention and smoke exhaust can be achieved. The occurrence of internal deflagration and explosion of the equipment is prevented.

[0039] The ventilation pipe 31 is provided with an axial flow fan mounting position 42, and the fan 41 is mounted at the axial flow fan mounting position 42 at the end of the ventilation pipe 31. A switchable double-channel air outlet structure 43 is arranged at the air outlet of the fan 41, and the double-channel air outlet structure 43 includes two air outlet channels, namely an internal environment ventilation port 431 of the energy storage device and an external environment ventilation port 432 of the energy storage device. The end portions of the two air outlet channels are connected and communicated with the end portion of the ventilation pipe 31 where the fan 41 is mounted, and the other ends of the two air outlet channels extend outward in a V-shaped structure. The internal environment ventilation port 431 of the energy storage device faces the energy storage device.

[0040] The double-channel control electromagnetic reversing valve 44 is installed in the double-channel air outlet structure 43, and the number of the electromagnetic reversing valve 44 is two and is located in the inside of the inside environment air outlet 431 and the outside environment air outlet 432 of the energy storage device respectively, a circular valve is installed on the electromagnetic reversing valve 44, the electromagnetic reversing valve 44 controls the movement of the valve and thus opens and closes the corresponding air outlet. When one of the air outlets needs to be switched on or off, the corresponding electromagnetic reversing valve 44 is controlled to work. The inside environment air outlet 431 and the outside environment air outlet 432 of the energy storage device are controlled by the electromagnetic reversing valve 44 to be connected or disconnected with the ventilation pipe 31. In actual use, the inside environment air outlet 431 of the energy storage device is always open, that is, the electromagnetic reversing valve 44 is always open, the ventilation pipe 31 is connected with the inside environment air outlet 431 of the energy storage device, and the passage of the outside environment air outlet 432 of the energy storage device is closed. When the temperature inside the battery pack is high and the cooling plate 11 needs to be cooled, the inside passage of the inside environment air outlet 431 of the energy storage device is closed and the passage of the outside environment air outlet 432 of the energy storage device is opened by controlling the electromagnetic reversing valve 44, so that the ventilation pipe 31 is connected with the outside environment air outlet 432 of the energy storage device, the hot air flow in the battery pack is quickly discharged, the temperature is quickly reduced, and the temperature equalization effect is achieved. When the temperature inside the battery pack is low and the cooling plate 11 needs to be heated, or the temperature inside the battery pack does not exceed the critical temperature of refrigeration, the electromagnetic reversing valve 44 is controlled so that the inside environment air outlet 431 of the energy storage device is always open and the outside environment air outlet 432 of the energy storage device is closed, the hot air flow in the battery pack is quickly circulated, the fast temperature equalization effect of each single cell of the battery pack is achieved, and the energy loss of the system is reduced.

[0041] In actual use, the energy storage device is used in a plurality of battery packs in series connection, and the air-cooled liquid-cooled thermal management system structure is used in multiple cases. The ventilation hole openings of each air-cooled liquid-cooled thermal management system structure correspond to the battery packs one by one, so that the air flow passes through each module of the battery, and good cooling and temperature equalization effects are achieved.

[0042] The low-power air-cooled liquid-cooled thermal management system structure has the following modes during work.

[0043] Natural air cooling mode, also called temperature equalization mode: without external fan power, relying on the heat generated in the internal cell charging and discharging process of the battery pack, forming a thermal pressure, the outside environment air outlet 432 of the energy storage device is closed, and the inside environment air outlet 431 of the energy storage device is in an open state, facing the structure of the utility model. That is, the internal cell of the battery pack in the energy storage device and the outside environment of the battery pack form a heat exchange.

[0044] Forced air cooling mode, under the action of additional axial fan power, air flow transmission is accelerated, the energy storage equipment external environment ventilation opening 432 is in an open state, the energy storage equipment internal environment ventilation opening 431 is in a closed state, air is directly discharged to the external environment, and the effect of rapid cooling is achieved.

[0045] Heat cycle mode, the utility model is in the heating state, additional fan 41 power, the energy storage equipment internal environment ventilation opening 43 is in an open state, internal hot air circulation is accelerated, and the internal temperature of the battery pack is rapidly and uniformly increased.

[0046] When the temperature of the battery pack exceeds 33 DEG C or the temperature difference of each cell exceeds 3 DEG C, the forced air cooling mode is started, and if the temperature or the temperature difference is not effectively controlled, the temperature continues to increase to 38 DEG C or the temperature difference exceeds 5 DEG C, and the existing liquid cooling machine is started, and the cooling effect is strengthened.

[0047] When the internal temperature of the battery pack is in the range of 18-33 DEG C, the utility model is in the natural air cooling mode, the energy storage equipment external environment ventilation opening 432 is closed, and the energy storage equipment internal environment ventilation opening 431 is in an open state, air flow is internally circulated, and the internal temperature of the battery pack is uniformly achieved.

[0048] When it is detected that the internal temperature of the battery pack is lower than 18 DEG C, the liquid cooling machine heating cycle is started, and meanwhile, the utility model is in the heat cycle mode, additional fan 41 power is added, the energy storage equipment external environment ventilation opening 432 is closed, and the energy storage equipment internal environment ventilation opening 431 is in an open state, internal air circulation is accelerated, and the internal temperature of the battery pack is rapidly and uniformly increased.

[0049] The utility model discloses a battery pack front end panel without fan design, only in the battery pack front, rear panel and battery module bottom, the position of pole high position is opened ventilation opening, the vent hole of battery pack front end panel is added protective grid, and the vent hole of battery pack rear end panel is connected with external ventilation pipeline. Axial flow fan is arranged at the end of the ventilation pipeline and is used as additional air volume controller. The air outlet at the end of the ventilation pipeline is set as switchable double-channel air outlet, one air outlet directly discharges air to the external environment, and the other air outlet is connected with the internal environment of the energy storage equipment, the internal temperature of the battery pack is rapidly and uniformly achieved. When the temperature of the internal battery of the utility model structure is too high and is in the state of heat dissipation, the air outlet directly discharges air to the external environment of the utility model structure and dissipates heat. When the temperature of the utility model structure is low and is in the state of heating, the air outlet is switched to the internal environment of the utility model structure, the heating of the internal liquid cooling plate of the battery pack and the effective utilization of the battery heat production temperature are realized, the heat loss in the process of temperature increase is reduced, and energy loss is reduced.

[0050] Those skilled in the art will understand that the embodiments described herein are for the purpose of helping the reader understand the principles of the present application, and should be understood as the protection scope of the present application is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspirations disclosed in the present application without departing from the essence of the present application, and these modifications and combinations are still within the protection scope of the present application.

Claims

1. A low-power air-cooled liquid cooling thermal management system structure, characterized in that: The application relates to a battery pack liquid cooling structure (1), a ventilation structure (2), a ventilation duct structure (3) and an exhaust structure (4) installed on the battery pack, wherein the battery pack liquid cooling structure (1) comprises a cooling plate (11) for cooling or heating the battery pack; the ventilation structure (2) comprises a front end plate (21) and a rear end plate (22), the front end plate (21) is provided with a front end plate through hole (211), the rear end plate (22) is provided with a rear end plate ventilation hole (221), and the front end plate (21) and the rear end plate (22) are located at two ends of the battery pack respectively; the ventilation duct structure (3) comprises a ventilation pipe (31), the end of the ventilation pipe (31) is connected with the rear end plate ventilation hole (221), the exhaust structure (4) comprises a fan (41), and the fan (41) is located at the end of the ventilation pipe (31) and before a switchable double-channel air outlet; when the energy storage battery pack needs to be cooled, the fan (41) works, air is extracted along the ventilation pipe (31), and the battery pack is cooled and evenly heated; when the energy storage battery pack needs to be heated, the liquid cooling plate is heated, the fan works, the double-channel air outlet is switched to the inside of the equipment, the heat generated by the equipment is internally circulated, and the energy consumption of the equipment is reduced.

2. The low-power air-cooled liquid cooling thermal management system structure according to claim 1, characterized in that: The cooling plate (11) is a "S" type circulating flow channel, the internal circulating water flow channel of the cooling plate is in a capsule type, the water inlet hole is small, the internal flow channel is large, the internal flow channel is filled with medium, the medium is a mixed solution of polyethylene glycol and pure water, and the support is heated in a -20 DEG C environment.

3. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: First connecting plates (23) and second connecting plates (24) are arranged between the front end plate (21) and the rear end plate (22), the number of the first connecting plates (23) is two, the first connecting plates (23) and the second connecting plates (24) are both designed without openings, the two first connecting plates (23), the second connecting plates (24) and the cooling plate (11) form a cuboid structure of the battery pack, the two ends of the first connecting plate (23) are connected with the front end plate (21) and the rear end plate (22) respectively, and the two ends of the second connecting plate (24) are connected with the front end plate (21) and the rear end plate (22) respectively.

4. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: The front end plate through hole (211) is arranged at a position where the lower part of the front end plate is flush with the bottom of the battery, and a protective grid is additionally arranged outside the front end plate through hole (211).

5. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: The rear end plate ventilation hole (221) is arranged at a position where the upper part of the rear end plate is flush with the battery pole, and a circular arc air duct interface is additionally arranged, and the interface is in communication with the end of the ventilation pipe (31).

6. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: The battery pack is in a rectangular structure, the rear end of the battery pack is higher than the front end by 3-10 DEG, so that air flow is gathered to the rear end of the battery pack, heat pressure is formed, and the battery pack can still form effective air flow under the action of no external power.

7. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: The outer surface of the ventilation pipe (31) is covered with a heat preservation material, such as polyurethane foam.

8. The low-power air-cooled liquid cooling thermal management system structure of claim 1, wherein: The ventilation pipe (31) is an external ventilation duct, the external ventilation duct is heat-preserved, and heat loss can be reduced when heating is needed.

9. The low-power liquid cooling thermal management system structure of claim 1, wherein: The air outlet of the fan (41) is provided with a switchable double-channel air outlet structure (43), which includes two air outlet channels, namely an internal environment air outlet (431) of the energy storage device and an external environment air outlet (432) of the energy storage device, and an electromagnetic reversing valve (44) is installed inside the double-channel air outlet structure (43), which controls the on-off state of the corresponding air outlet. The internal environment air outlet (431) of the energy storage device is in a normally open state, and the ventilation pipe (31) is closed with the passage of the external environment air outlet (432) of the energy storage device. When the internal temperature of the battery pack is high and the cooling plate (11) needs to be cooled, the internal channel of the internal environment air outlet (431) of the energy storage device is closed and the channel of the external environment air outlet (432) of the energy storage device is opened by controlling the electromagnetic reversing valve (44), so that the ventilation pipe (31) is communicated with the external environment air outlet (432) of the energy storage device, the rapid exhaust of hot air flow in the battery pack is accelerated, rapid cooling and uniform temperature effect are realized; when the internal temperature of the battery pack is low and the cooling plate (11) needs to be heated, or the internal temperature of the battery pack does not exceed the critical temperature of refrigeration, the electromagnetic reversing valve (44) is controlled at this time, so that the internal environment air outlet (431) of the energy storage device is always open and the external environment air outlet (432) of the energy storage device is closed, the rapid circulation of hot air flow in the battery pack is accelerated, the rapid uniform temperature effect of each single cell of different battery packs is realized, and the system energy loss is reduced.

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