Liquid cooling temperature control energy storage battery pack and liquid cooling temperature control system thereof

Abstract

The invention provides a liquid cooling temperature control energy storage battery pack and a liquid cooling temperature control system.The energy storage battery pack comprises a battery pack, a liquid supply system and a circulating system, and the battery pack comprises at least one battery fixed in a box body; the circulating system comprises a main manifold liquid inlet layer, a liquid cooling plate and a main manifold water return layer which are sequentially connected, the liquid cooling plate is arranged between adjacent batteries and attached to the surfaces of the batteries, a flow channel is formed in the liquid cooling plate, and a particle layer is arranged on the inner side of the flow channel. An outlet of the spiral pipeline is communicated with the main manifold liquid inlet layer through a pipeline, and an inlet of the liquid pump is communicated with the main manifold water return layer through a pipeline. According to the liquid cooling plate, the particle layer is arranged in the liquid cooling plate to induce the fluid to generate vortex, so that the heat dissipation efficiency and the temperature uniformity are improved. In addition, the closed dry water tank, the spiral pipeline, the liquid pump and other liquid supply system components are arranged outside the box body on one side of the battery, so that the space requirement in the battery pack is reduced.

Description

Technical Field

[0001] The present invention relates to a liquid-cooled temperature-controlled energy storage battery pack. The present invention also relates to a liquid-cooled temperature-controlled system for the energy storage battery pack, belonging to the technical field of heat dissipation systems for energy storage battery packs. Background Art

[0002] Energy storage battery packs are a crucial component of battery energy storage systems, and heat dissipation is a key factor affecting their performance, lifespan, and safety. Traditional cooling systems are inefficient, making it difficult to quickly dissipate large amounts of heat during rapid charging, high-rate discharge, or high-temperature environments, leading to a sudden rise in battery temperature.

[0003] The increase in battery temperature is usually local, or the temperature uniformity is poor, and local hot spots are prone to appear inside the battery pack, accelerating battery degradation and even causing thermal runaway.

[0004] In recent years, liquid cooling systems have attracted widespread attention in high-energy-density applications such as energy storage and electric vehicles due to their strong heat dissipation capabilities and excellent temperature uniformity. Traditional liquid cooling systems improve the heat dissipation efficiency of high-energy-density batteries by utilizing liquid media with high specific heat capacity and thermal conductivity. Their active circulation also increases heat dissipation speed in high-power scenarios. However, existing liquid cooling systems still have design issues that require further optimization:

[0005] 1. Pumps, pipes, heat exchangers and other components are placed inside the battery pack, resulting in an increase in overall space requirements.

[0006] 2. Since key components, such as pumps and heat exchangers, are integrated into the battery pack, subsequent maintenance or replacement is difficult and costly.

[0007] 3. The use of serpentine pipes running through the battery pack results in poor heat dissipation in the center area of ​​the battery pack. Summary of the Invention

[0008] The object of the present invention is to provide a liquid-cooled temperature-controlled energy storage battery pack and a liquid-cooled temperature-control system thereof, so as to improve the heat dissipation effect of the battery pack liquid cooling system.

[0009] The present invention adopts the following technical solutions:

[0010] The present invention provides a liquid-cooled temperature-controlled energy storage battery pack, characterized by comprising:

[0011] Battery pack, liquid supply system and circulation system,

[0012] The battery pack includes: at least one battery (111) fixed in a box (32);

[0013] The circulation system includes: a main manifold liquid inlet layer (25), a liquid cooling plate (26) and a main manifold water return layer (27) connected in sequence.

[0014] The liquid cooling plate (26) is arranged between adjacent batteries (111) and is in contact with the surface of the battery (111). The liquid cooling plate (26) has a flow channel (263) inside, and a particle layer (264) is provided inside the flow channel.

[0015] The liquid supply system comprises a spiral pipe (21) and a liquid pump (24) which are interconnected.

[0016] The outlet of the spiral pipe (21) is connected to the main manifold liquid inlet layer (25) through a pipeline, and the inlet of the liquid pump (24) is connected to the main manifold water return layer (27) through a pipeline.

[0017] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: the side of the liquid cooling plate (26) has a liquid inlet (261) at the bottom and a liquid outlet (262) at the top.

[0018] Furthermore, the liquid-cooled and temperature-controlled energy storage battery pack of the present invention has the following feature: the flow channels are parallel flow channels.

[0019] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: the parallel flow channels of the liquid cooling plate (26) have no duplication of flow areas.

[0020] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: the main manifold liquid inlet layer has a liquid outlet (251) corresponding to the liquid inlet of the liquid cooling plate (26);

[0021] The main manifold liquid return layer has a liquid inlet (271) corresponding to the liquid outlet of the liquid cooling plate (26).

[0022] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: a temperature detector (41) is provided on one side of the battery pack and is attached to the battery.

[0023] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: a temperature detector (41) detects the temperature of the battery pack, and when the temperature reaches a predetermined value, the liquid pump (24) is triggered to operate.

[0024] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: an auxiliary booster pump (23) connected to the liquid pump through a pipeline.

[0025] Furthermore, the liquid-cooled temperature-controlled energy storage battery pack of the present invention also has the following characteristics: it also has: a sealed dry water tank (22) filled with heat-conducting material, and the spiral pipe (21) is embedded in the heat-conducting material.

[0026] The present invention also provides a liquid cooling temperature control system for an energy storage battery pack, characterized by comprising:

[0027] control unit,

[0028] Temperature detector,

[0029] A parameter storage unit stores a series of temperature thresholds and corresponding liquid pump power values;

[0030] When the temperature detected by the temperature detector reaches a threshold value, the control unit sends an electrical signal to control the power of the liquid pump.

[0031] Beneficial effects of the invention: The present invention increases the heat dissipation area by setting micro-rough flow channels in the liquid cooling plate between the batteries, and utilizes the curved surface characteristics of the micro-rough structure to induce vortices in the fluid, promote shear and disturbance between the fluids, enhance the mixing of cold and hot fluids, and reduce the thickness of the temperature boundary layer, so as to achieve improved heat dissipation efficiency and temperature uniformity.

[0032] The liquid cooling plate's parallel flow channels improve temperature uniformity, avoid heat "dead spots," and reduce pump power requirements. Furthermore, the high thermal conductivity of alumina, expanded into high-conductivity particles, accelerates heat transfer from the wall to the coolant.

[0033] In addition, the liquid supply system components such as the sealed dry water tank, spiral pipe and liquid pump are placed outside the box on one side of the battery to reduce the space requirement inside the battery pack and facilitate disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of the liquid-cooled temperature-controlled energy storage battery pack of the present invention;

[0035] Figure 2 This is a schematic diagram of the liquid cooling plate and corresponding pipeline structure in the present invention;

[0036] Figure 3 Schematic diagram of the internal structure of the liquid cooling plate in the present invention;

[0037] Figure 4 This is a schematic diagram of the main manifold and corresponding pipeline structure in the present invention. DETAILED DESCRIPTION

[0038] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0039] like Figures 1 to 4 shown.

[0040] The liquid-cooled temperature-controlled energy storage battery pack includes a battery pack, a liquid supply system, and a circulation system.

[0041] The battery pack 11 includes at least one battery 111 , which is fixed in the box 32 by a cable tie.

[0042] The box body 32 has a first partition plate 33 , a second partition plate 37 and a third partition plate formed by the main manifold liquid inlet layer 25 and the main manifold water return layer 27 .

[0043] The battery pack 11 is separated from the liquid supply system by a first partition 33 , and a second partition 37 is provided on the opposite side.

[0044] In a preferred embodiment, the first partition 33 includes a ceramic fiber insulation layer and a silicone shock-absorbing pad, which can prevent the heat generated by the liquid supply system from entering the battery pack 111 and reduce the impact of vibration generated by the operation of the liquid pump 24.

[0045] The other partitions involved in forming the box body 32 do not have special structures and will not be described in detail here.

[0046] A cable tie plate 31 and cable tie plate ventilation holes 311 are provided above the box body 32 .

[0047] The liquid supply system includes a spiral pipe 21 and a sealed dry water tank 22 and a liquid pump 24 outside the spiral pipe 21 . In some embodiments, an auxiliary booster pump 23 may be added between the spiral pipe 21 and the liquid pump 24 .

[0048] The spiral pipe 21 is placed in a sealed dry water tank 22, and the hollow part is filled with graphene to promote the cooling of the coolant in the spiral pipe. In other embodiments, multi-layer graphene microsheets can be used in the dry water tank.

[0049] Circulation system: includes the main manifold liquid inlet layer 25, the liquid cooling plate 26 and the main manifold water return layer 27.

[0050] like Figure 2 and Figure 3 As shown, the liquid cooling plate 26 has parallel flow channels 263 inside.

[0051] The parallel flow channels 263 of the liquid cooling plate 26 do not have overlapping flow areas, thereby increasing the heat exchange area, reducing the temperature difference on the battery surface, and lowering the pump work requirement.

[0052] like Figure 3 As shown, a particle layer 264 is sprayed on the inner side of the parallel flow channel 263 of the liquid cooling plate 26. When the coolant flows through this layer, it induces the formation of a vortex structure in the coolant, promotes the mixing of cold and hot fluids, effectively reduces the thickness of the temperature boundary layer, and improves the heat exchange efficiency.

[0053] In a preferred embodiment, the particle layer 264 can be formed by spraying aluminum oxide particles. When spraying the aluminum oxide particle layer, the particle size of the aluminum oxide particles used is in the range of 5 μm to 50 μm, which is a closed interval including the endpoint value.

[0054] The thickness of the particle layer formed by spraying is between 10 μm and 500 μm, and this range is a closed interval and includes the end point value.

[0055] In other embodiments, the particle layer 264 may be formed by spraying graphene-based heat dissipation paint, and the thickness of the formed particle layer is between 10 μm and 500 μm, which is a closed interval and includes the end point value.

[0056] Of course, the particle layer can also be formed by electrostatic spraying, dipping, or the like, which can uniformly attach the particles to the inner wall of the metal.

[0057] like Figure 1 As shown, the liquid inlet of the liquid cooling plate 26 is connected to the main manifold liquid inlet layer 25, and the liquid outlet is connected to the main manifold liquid return layer 27.

[0058] like Figure 4 As shown, the main manifold liquid inlet layer has a liquid inlet pipe 61, and the liquid return layer has a liquid outlet pipe 62. The main manifold liquid inlet layer 25 has a second liquid outlet 251, and the liquid return layer 27 has a second liquid inlet 271.

[0059] like Figure 2 As shown, the liquid supply system comprises a liquid inlet pipe 51 and a liquid outlet pipe 52. The first liquid inlet pipe 51 is communicated with the second liquid outlet pipe 62, and the first liquid outlet pipe 52 is communicated with the second liquid inlet pipe 61.

[0060] The liquid cooling plate 26 has a first liquid inlet 261 at the bottom and a first liquid outlet 262 at the top.

[0061] The first liquid inlet 261 and the first liquid outlet 262 of the liquid cooling plate 26 correspond to the second liquid outlet 251 of the main manifold liquid inlet layer 25 and the second liquid inlet 271 of the liquid return layer 27, respectively, forming a liquid inlet and outlet loop.

[0062] In this embodiment, the heights of the first liquid inlet 261 and the first liquid outlet 262 are respectively consistent with the heights of the second liquid outlet 251 of the main manifold liquid inlet layer and the second liquid inlet 271 of the liquid inlet layer.

[0063] In this embodiment, the connection between the liquid supply system and the main manifold, and between the main manifold and the liquid cooling plate adopts a high-pressure hose and a quick-release connector, and the outside is sealed and fixed by a rubber O-ring, thereby ensuring the airtightness of the heat dissipation system, avoiding leakage of the coolant, and facilitating disassembly and maintenance.

[0064] like Figure 1 As shown, the sealed dry water tank 22 and the liquid pump 24 are placed on the water tank partition 34 and the liquid pump partition 35 respectively.

[0065] like Figure 2 As shown, a temperature detector 41 is provided on one side of the battery pack 11. It is attached to the battery to detect the battery temperature in real time.

[0066] The temperature detector 41 detects the temperature of the battery pack. When the temperature reaches a threshold, the liquid pump 24 is triggered to work, thereby achieving the purpose of energy saving.

[0067] In one embodiment, the temperature thresholds include: a first threshold: 25° C., a second threshold: 35° C., and a third threshold: 45° C., and an overheat alarm is issued when the third threshold is reached.

[0068] The liquid cooling temperature control system provided in this embodiment includes: a control unit, a temperature detector and a parameter storage unit.

[0069] The parameter storage unit stores a series of temperature thresholds and corresponding liquid pump power values. In one embodiment, the stored temperature thresholds are the first threshold of 30°C and the second threshold of 40°C.

[0070] In a preferred embodiment, a series of temperature thresholds are set with 5° C. as a step: 25° C., 30° C., 35° C., 40° C., and 45° C. Corresponding to each temperature threshold, a liquid pump power value is set.

[0071] When the temperature detected by the temperature detector reaches a corresponding threshold, the control unit sends an electrical signal to control the power of the liquid pump.

[0072] The maximum power of the liquid pump is achieved at 40°C. 45°C and above are dangerous values ​​that trigger the overheating alarm.

[0073] The operation process of the above system is as follows:

[0074] (1) The liquid pump 24 is started, and the coolant enters the spiral pipe 21 through the auxiliary booster pump 23;

[0075] (2) The coolant enters the main manifold liquid inlet layer 25 through the spiral pipe 21;

[0076] (3) The coolant enters the first liquid inlet 261 through the second liquid outlet 251 of the main manifold liquid inlet layer 25, and is divided into two streams and enters the liquid cooling plate 26. Under the influence of the parallel flow channel and the inner particle layer, the heat dissipation area is increased and the hot and cold fluids are mixed.

[0077] (4) The coolant flows through the liquid cooling plate, absorbs heat, flows through the main manifold return layer 27, returns to the liquid pump, and is pumped into the spiral pipe 21 again to realize the circulation of the coolant.

[0078] During this process, the temperature detector monitors the battery temperature in real time. When the battery temperature reaches a specific value, the liquid pump is triggered to start working, starting the above-mentioned heat dissipation process to achieve energy saving.

[0079] Compared with the prior art, the advantages of the present invention are:

[0080] The present invention increases the contact area between the inner wall of the flow channel and the coolant and enhances heat conduction by setting up micro-rough flow channels in the liquid cooling plate between the batteries. It also utilizes the curved surface characteristics of the micro-rough structure to induce vortices in the fluid, promote shear and disturbance between the fluids, enhance the mixing of hot and cold fluids, and reduce the thickness of the temperature boundary layer, thereby achieving improved heat dissipation efficiency and temperature uniformity.

[0081] The micro-rough structure in the particle layer inside the parallel flow channel uses aluminum oxide particles, which causes less resistance while enhancing heat dissipation. In addition, the high thermal conductivity of aluminum oxide is expanded into material particles with high thermal conductivity, which can accelerate the transfer of heat from the wall to the coolant.

[0082] Compared with traditional spoiler structures such as fins and baffles, it can reduce pumping power and improve energy efficiency while maintaining the same heat dissipation effect.

[0083] The liquid cooling plate flow channels are set as parallel channels, which improves temperature uniformity while avoiding the occurrence of heat "dead corners" to a certain extent and reduces the demand for pump power.

[0084] In addition, the liquid supply system components such as the sealed dry water tank, spiral pipes and liquid pumps are placed outside the box on one side of the battery to save space inside the battery pack and facilitate disassembly and maintenance.

[0085] The sealed water tank, spiral pipe, auxiliary boost pump and liquid pump are placed on one side of the battery pack and separated from the battery pack by a partition made of a ceramic fiber insulation layer and a silicone shock-absorbing pad to reduce the heat input of the liquid and equipment vibration.

[0086] The present invention is applicable to various heat dissipation systems, especially heat dissipation systems of high energy density batteries.

[0087] In addition, the heat dissipation system provided by the present invention is also applicable in other heat dissipation scenarios, such as industrial and scientific research applications such as electronic equipment and chip heat dissipation and energy systems.

[0088] The terms “first”, “second”, etc. in the above embodiments are only used to distinguish similar structures, rather than to indicate the number and order of the structures.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other variation to the technical solution and technical contents disclosed herein shall be deemed to be within the scope of the present invention and still fall within the scope of protection of the present invention.

Claims

1. A liquid-cooled temperature-controlled energy storage battery pack, characterized in that: include: Battery pack, liquid supply system and circulation system, The battery pack includes: at least one battery (111) fixed in a box (32); The circulation system includes: a main manifold liquid inlet layer (25), a liquid cooling plate (26) and a main manifold water return layer (27) connected in sequence. The liquid cooling plate (26) is disposed between adjacent batteries (111) and is in contact with the surface of the battery (111). The liquid cooling plate (26) has a flow channel (263) inside, and a particle layer (264) is provided inside the flow channel. The liquid supply system comprises a spiral pipe (21) and a liquid pump (24) which are interconnected. The outlet of the spiral pipe (21) is connected to the main manifold liquid inlet layer (25) through a pipeline, and the inlet of the liquid pump (24) is connected to the main manifold water return layer (27) through a pipeline.

2. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: The side surface of the liquid cooling plate (26) has a liquid inlet (261) at the bottom and a liquid outlet (262) at the top.

3. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: The flow channels are parallel flow channels.

4. The liquid-cooled temperature-controlled energy storage battery pack according to claim 3, characterized in that: The parallel flow channels of the liquid cooling plate (26) do not have repeated flow areas.

5. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: The main manifold liquid inlet layer has a liquid outlet (251) corresponding to the liquid inlet of the liquid cooling plate (26); The main manifold liquid return layer has a liquid inlet (271) corresponding to the liquid outlet of the liquid cooling plate (26).

6. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: A temperature detector (41) is provided on one side of the battery pack and is attached to the battery.

7. The liquid-cooled temperature-controlled energy storage battery pack according to claim 6, characterized in that: The temperature detector (41) detects the temperature of the battery pack, and when the temperature reaches a predetermined value, the liquid pump (24) is triggered to operate.

8. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: Also features: An auxiliary booster pump (23) is connected to the liquid pump through a pipeline.

9. The liquid-cooled temperature-controlled energy storage battery pack according to claim 1, characterized in that: Also features: A sealed dry water tank (22) is filled with a heat-conducting material, and the spiral pipe (21) is embedded in the heat-conducting material.

10. A liquid cooling temperature control system for an energy storage battery pack, characterized in that: include: control unit, Temperature detector, A parameter storage unit stores a series of temperature thresholds and corresponding liquid pump power values; When the temperature detected by the temperature detector reaches a threshold value, the control unit sends an electrical signal to control the power of the liquid pump.

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