Power battery liquid cooling system

Abstract

The present invention provides a liquid cooling system for a power battery, comprising: a main pipeline; a water pump; a radiator; a water tank; a liquid replenishing pipeline; a degassing valve, which is arranged at the degassing port of the main pipeline and is connected to the main pipeline for discharging the gas in the main pipeline; a solenoid valve, which is arranged inside the main pipeline. When the solenoid valve is opened, the coolant can circulate in the main pipeline, and when the solenoid valve is closed, the coolant cannot circulate in the main pipeline. Wherein, the circulating flow direction of the coolant in the main pipeline is from the water pump to the degassing port, then to the solenoid valve, and then back to the water pump. The embodiment of the present invention can discharge the gas in the system, enabling the coolant replenished from the liquid replenishing pipeline to enter the main pipeline more smoothly, reducing the time consumed for filling the coolant; and having a better heat dissipation effect on the power battery, avoiding the occurrence of excessive local temperature of the power battery.

Description

Technical Field

[0001] The present invention relates to the field of power batteries, and particularly to a liquid cooling system for power batteries. Background Art

[0002] Power batteries play an important role in the development of the new energy industry. To ensure the normal operation of power batteries, a liquid cooling system is usually used to dissipate heat from the power batteries. In the prior art, since multiple power batteries usually work together, the pipeline structure of the liquid cooling system is complex. Once air is mixed in the pipeline, when the user fills the liquid cooling system with coolant, the coolant cannot smoothly enter the liquid cooling system, resulting in difficult coolant filling and consuming a lot of manpower. Moreover, when air is mixed in the pipeline, it will cause uneven heat dissipation of the power battery, resulting in too high a local temperature of the power battery. Summary of the Invention

[0003] An object of the present invention is to provide a liquid cooling system for power batteries, which can discharge the gas in the system, make the coolant supplemented from the replenishing pipeline enter the main pipeline more smoothly, reduce the time and manpower consumed for filling the coolant, and has a better heat dissipation effect on the power battery, avoiding the occurrence of too high a local temperature of the power battery.

[0004] According to an aspect of an embodiment of the present invention, a liquid cooling system for power batteries is disclosed, including:

[0005] A main pipeline, which is in contact with the power battery and is used for allowing the coolant to circulate in the main pipeline to dissipate heat from the power battery;

[0006] A water pump, which is arranged on the main pipeline and is used for driving the coolant to circulate in the main pipeline;

[0007] A radiator, which is arranged on the main pipeline and is used for reducing the temperature of the coolant;

[0008] A water tank, which is arranged above the main pipeline and is used for containing the coolant;

[0009] A replenishing pipeline, the two ends of which are respectively communicated with the main pipeline and the water tank and are used for transporting the coolant in the water tank to the main pipeline;

[0010] An air vent valve, which is arranged at the air vent of the main pipeline and is communicated with the main pipeline for discharging the gas in the main pipeline;

[0011] An electromagnetic valve, which is arranged inside the main pipeline. When the electromagnetic valve is opened, the coolant can circulate in the main pipeline. When the electromagnetic valve is closed, the coolant cannot circulate in the main pipeline;

[0012] Among them, the circulating flow direction of the coolant in the main pipeline is from the water pump to the degassing port, then to the solenoid valve, and then back to the water pump.

[0013] According to an exemplary embodiment of the present invention, the degassing valve is a one-way degassing valve, and the gas flow direction of the one-way degassing valve is from the inside of the main pipeline to the outside of the main pipeline.

[0014] According to an exemplary embodiment of the present invention, the system further includes:

[0015] A degassing pipeline, with both ends of the degassing pipeline respectively communicating with the degassing valve and the water tank, for discharging the gas in the main pipeline to the water tank.

[0016] According to an exemplary embodiment of the present invention, the system further includes:

[0017] A solenoid valve switch, electrically connected to the solenoid valve, for opening or closing the solenoid valve.

[0018] According to an exemplary embodiment of the present invention, the solenoid valve switch is also electrically connected to the water pump, for turning on the water pump while closing the solenoid valve.

[0019] According to an exemplary embodiment of the present invention, the system further includes:

[0020] A water pump switch, electrically connected to the water pump, for opening or closing the water pump.

[0021] According to an exemplary embodiment of the present invention, the system further includes:

[0022] Branch pipelines, each branch pipeline is in contact with a power battery respectively, and the pipeline ports at both ends of each branch pipeline are provided on the pipe wall of the main pipeline and communicate with the main pipeline.

[0023] According to an exemplary embodiment of the present invention, the water pump, the degassing valve and the solenoid valve are all arranged in the main area of the main pipeline, where the main area is the area of the main pipeline not covered by any branch pipeline.

[0024] According to an exemplary embodiment of the present invention, the inlet pipeline ports of each branch pipeline are co-located on an inlet plane, the inlet plane is perpendicular to the main pipeline, wherein the coolant flows out of the main pipeline from the inlet pipeline port of the branch pipeline and re-enters the main pipeline from the outlet pipeline port of the branch pipeline.

[0025] According to an exemplary embodiment of the present invention, the radiator is arranged between the water pump and the inlet plane.

[0026] In an embodiment of the present invention, a water pump is used as the starting point of the circulating flow direction of the coolant in the main pipeline. By setting the degassing port on the main pipeline wall behind the water pump and before the solenoid valve inside the main pipeline, when the solenoid valve is closed, under the action of the water pump, the air in the coolant will be concentrated and pushed towards the degassing port and then discharged from the degassing valve, thereby removing the air mixed in the power battery liquid cooling system. After degassing is completed, the coolant replenished from the replenishing pipeline can enter the main pipeline more smoothly, reducing the time and labor consumed for filling the coolant; and the heat dissipation effect on the power battery is better, avoiding the occurrence of too high local temperature of the power battery.

[0027] Other features and advantages of the present invention will become apparent from the following detailed description, or will be learned in part through the practice of the present invention.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present invention. Brief Description of the Drawings

[0029] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other objects, features and advantages of the present invention will become more apparent.

[0030] Figure 1 Shows the working principle diagram of the power battery liquid cooling system according to an embodiment of the present invention.

[0031] Figure 2 Shows according to an embodiment of the present invention Figure 1 The composition schematic diagram of the power battery liquid cooling system in

[0032] The description of the reference numerals in the drawings is as follows:

[0033] 1 - Power battery liquid cooling system, 2 - Water pump, 3 - Power battery, 4 - Degassing pipe, 5 - Water tank, 6 - Replenishing pipeline, 7 - Water pump inlet pipe, 8 - Branch pipeline, 9 - Replenishing port, 10 - One-way degassing valve, 11 - Degassing port, 12 - Solenoid valve, 13 - Solenoid valve wiring harness, 14 - Solenoid valve switch. Detailed Embodiments

[0034] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these exemplary embodiments are provided so that the description of the present invention will be more complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The drawings are only schematic diagrams of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0035] In addition, the described features, structures, or characteristics may be combined in any suitable manner in one or more exemplary embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the exemplary embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention may be practiced by omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0036] The present invention provides a power battery liquid cooling system for dissipating heat from a power battery. The system includes:

[0037] A main pipeline that is in contact with the power battery and is used for circulating coolant in the main pipeline to dissipate heat from the power battery;

[0038] A water pump that is provided in the main pipeline and is used for driving the coolant to circulate in the main pipeline;

[0039] A radiator that is provided in the main pipeline and is used for reducing the temperature of the coolant;

[0040] A water tank that is provided above the main pipeline and is used for containing the coolant;

[0041] A liquid replenishing pipeline whose two ends are respectively connected to the main pipeline and the water tank and is used for transporting the coolant in the water tank to the main pipeline;

[0042] An air vent valve that is provided at the air vent of the main pipeline and is in communication with the main pipeline and is used for discharging the gas in the main pipeline;

[0043] An electromagnetic valve that is provided inside the main pipeline. When the electromagnetic valve is opened, the coolant can circulate in the main pipeline. When the electromagnetic valve is closed, the coolant cannot circulate in the main pipeline;

[0044] Wherein, the circulating direction of the coolant in the main pipeline is from the water pump to the air vent, then to the electromagnetic valve, and then back to the water pump.

[0045] Specifically, the power battery liquid cooling system in the embodiments of the present invention dissipates heat from the power battery through the circulating coolant.

[0046] Driven by the water pump on the main pipeline, the coolant circulates in the main pipeline; the main pipeline is in contact with the power battery. Thus, when the temperature of the coolant flowing through the power battery is lower than the temperature of the power battery, heat exchange occurs between the two, the coolant absorbs the heat of the power battery, and the power battery dissipates heat.

[0047] When the coolant that has absorbed the heat of the power battery flows through the radiator on the main pipeline, the heat in it will be discharged under the action of the radiator, and the temperature of the coolant will decrease. Thus, when the coolant flows through the power battery again, the temperature of the coolant remains at a relatively low level.

[0048] Both ends of the liquid replenishment pipeline are respectively connected to the main pipeline and the water tank. Thus, the user can pour coolant into the water tank, and then the coolant in the water tank flows into the main pipeline through the liquid replenishment pipeline, thereby realizing the replenishment of coolant to the system.

[0049] The degassing valve on the main pipeline degassing port is connected to the main pipeline, so that the gas in the main pipeline can be discharged from the degassing valve. The circulating flow direction of the coolant in the main pipeline is "water pump -> degassing port -> solenoid valve -> water pump". When the solenoid valve is closed and the water pump is turned on, due to the action of the solenoid valve, the coolant cannot circulate in the main pipeline, but at the same time, due to the action of the water pump, the coolant will be subject to a driving force, and this driving force squeezes the coolant from the water pump to the degassing valve and then to the solenoid valve. In this case, when there is air mixed in the coolant, the air will also be squeezed. Since the solenoid valve blocks the passage of liquid and gas, and the degassing valve provides a gas passage, therefore, the air in the coolant will be concentrated and pushed towards the degassing port and then discharged from the degassing valve, thereby removing the air mixed in the power battery liquid cooling system.

[0050] After degassing is completed, since the gas in the main pipeline decreases, the coolant replenished from the liquid replenishment pipeline can enter the main pipeline more smoothly, reducing the time and labor consumed for filling the coolant.

[0051] After degassing is completed, opening the solenoid valve can make the coolant continue to circulate in the main pipeline. Since the gas in the main pipeline decreases, the heat dissipation effect on the power battery is better, avoiding the occurrence of too high local temperature of the power battery.

[0052] It can be seen that in the embodiment of the present invention, taking the water pump as the starting point of the circulating flow direction of the coolant in the main pipeline, by setting the degassing port on the main pipeline wall after the water pump and before the solenoid valve inside the main pipeline, when the solenoid valve is closed, under the action of the water pump, the air in the coolant will be concentrated and pushed towards the degassing port and then discharged from the degassing valve, thereby removing the air mixed in the power battery liquid cooling system. After degassing is completed, the coolant replenished from the liquid replenishment pipeline can enter the main pipeline more smoothly, reducing the time and labor consumed for filling the coolant; and the heat dissipation effect on the power battery is better, avoiding the occurrence of too high local temperature of the power battery.

[0053] In one embodiment, the degassing valve is a one-way degassing valve, and the gas flow direction of the one-way degassing valve is from the inside of the main pipeline to the outside of the main pipeline.

[0054] In this embodiment, the component provided on the wall of the main pipeline for discharging the gas in the main pipeline is a one-way degassing valve, which only allows gas to flow from the inside of the main pipeline to the outside of the main pipeline.

[0055] The advantage of this embodiment is that through the setting of the one-way degassing valve, it avoids the occurrence of the phenomenon that after the power battery liquid cooling system stops running, due to thermal expansion and contraction, a part of the gas returns to the main pipeline through the degassing valve.

[0056] In one embodiment, the system further includes:

[0057] A degassing pipeline, the two ends of which are respectively connected to the degassing valve and the water tank, and is used to discharge the gas in the main pipeline to the water tank.

[0058] In this embodiment, a degassing pipeline is also provided in the power battery liquid cooling system. The degassing valve is connected to the water tank through the degassing pipeline, so that after the gas in the main pipeline is discharged from the degassing valve, it will be further discharged into the water tank.

[0059] The advantage of this embodiment is that through the setting of the degassing pipeline, the gas in the main pipeline will be discharged into the water tank, ensuring the effective control of the discharged gas and avoiding the corrosion of the outer wall of the main pipeline or other components in the power battery liquid cooling system caused by the discharged gas.

[0060] In one embodiment, the system further includes:

[0061] An electromagnetic valve switch, which is electrically connected to the electromagnetic valve and is used to open or close the electromagnetic valve.

[0062] In this embodiment, an electromagnetic valve switch electrically connected to the electromagnetic valve is also provided in the power battery liquid cooling system. The user can manually control the electromagnetic valve switch to open or close the electromagnetic valve.

[0063] In one embodiment, the electromagnetic valve switch is also electrically connected to the water pump and is used to turn on the water pump while closing the electromagnetic valve.

[0064] In this embodiment, the electromagnetic valve switch provided in the power battery liquid cooling system is electrically connected to the electromagnetic valve and also to the water pump. Through this electrical connection configuration, when the user manually controls the electromagnetic valve switch to close the electromagnetic valve, the water pump is turned on, so that the gas in the main pipeline is discharged from the degassing valve.

[0065] The advantage of this embodiment is that through the simultaneous control of the electromagnetic valve and the water pump by the electromagnetic valve switch, the user can achieve the degassing of the power battery liquid cooling system through a single-key operation of the electromagnetic valve switch.

[0066] In one embodiment, the system further includes:

[0067] A water pump switch, which is electrically connected to the water pump and is used to turn on or off the water pump.

[0068] In this embodiment, a water pump switch electrically connected to the water pump is also provided in the power battery liquid cooling system. The user can manually control the water pump switch to turn the water pump on or off.

[0069] In one embodiment, the system further includes:

[0070] Branch pipes, each branch pipe is in contact with a power battery respectively, and the pipe orifices at both ends of each branch pipe are arranged on the pipe wall of the main pipe and are communicated with the main pipe.

[0071] In this embodiment, there are multiple power batteries cooled by the power battery liquid cooling system. In accordance with the number of power batteries, the system is also provided with branch pipes. Each branch pipe is in contact with a power battery; the pipe orifices at both ends of each branch pipe are arranged on the pipe wall of the main pipe and are communicated with the main pipe. Thus, during the process of the coolant circulating in the main pipe, when flowing through the branch pipe, it will be dispersed into the branch pipe, and then the coolant in the branch pipe dissipates heat from the power battery contacted by the branch pipe. After flowing out of the branch pipe, the coolant will converge into the main pipe and continue to circulate in the main pipe.

[0072] In one embodiment, the water pump, the degassing valve and the solenoid valve are all arranged in the main area of the main pipe, where the main area is the area of the main pipe not covered by any branch pipe.

[0073] In this embodiment, according to whether it is covered by the branch pipe, the main pipe is divided into a main area and a non-main area. The non-main area is the area of the main pipe covered by at least one branch pipe, and the main area is the area of the main pipe not covered by any branch pipe. The water pump, the degassing valve and the solenoid valve are all arranged in the main area.

[0074] Wherein, being covered means that in the direction of the circulating flow, if the inlet pipe orifice of a branch pipe is at position A of the main pipe and its outlet pipe orifice is arranged at position B of the main pipe, then the area of the main pipe from position A to position B is covered by the branch pipe. The inlet pipe orifice refers to the branch pipe orifice where the coolant flows out of the main pipe and into the branch pipe; the outlet pipe orifice refers to the branch pipe orifice where the coolant flows out of the branch pipe and re-enters the main pipe.

[0075] The advantage of this embodiment is that by arranging the water pump, the degassing valve and the solenoid valve in the main area, it is ensured that the degassing can take effect on all branch pipes.

[0076] In one embodiment, the inlet pipe openings of each branch pipe are co-located on an inlet plane that is perpendicular to the main pipe. Here, the coolant flows out of the main pipe from the inlet pipe openings of the branch pipes and re-enters the main pipe from the outlet pipe openings of the branch pipes.

[0077] In this embodiment, the inlet pipe openings of all the branch pipes are co-located on an inlet plane that is perpendicular to the main pipe. That is, the inlet pipe openings of the branch pipes are perpendicular to the axial direction of the main pipe and are arranged around the main pipe in a circular pattern.

[0078] The advantage of this embodiment is that by co-locating the inlet pipe openings of all the branch pipes on the inlet plane, the coolant in the main pipe can be simultaneously dispersed into each branch pipe.

[0079] In one embodiment, the radiator is disposed between the water pump and the inlet plane.

[0080] In this embodiment, the inlet pipe openings of all the branch pipes are co-located on the inlet plane, and the radiator is disposed between the water pump and the inlet plane. Thus, it can be seen that the direction of the coolant circulation flow is from the water pump to the radiator and then to the inlet plane. Therefore, before the coolant in the main pipe is simultaneously dispersed into each branch pipe, it will undergo a cooling process.

[0081] The advantage of this embodiment is that by cooling the coolant before it is simultaneously dispersed into each branch pipe in the main pipe, it ensures that the coolant in each branch pipe is at a relatively low temperature, thereby ensuring the heat dissipation effect for each power battery.

[0082] Figure 1 The working principle diagram of the power battery liquid cooling system according to an embodiment of the present invention is shown.

[0083] Reference Figure 1 As shown, in this embodiment, the pipes of the power battery liquid cooling system 1 pass through multiple power batteries 3. Under the action of the water pump 2, the coolant circulates in the pipes to dissipate heat from each power battery 3.

[0084] While the liquid filling pipe 6 is in communication with the power battery liquid cooling system 1, it is also in communication with the water tank 5. When it is necessary to replenish the coolant into the power battery liquid cooling system 1, the user can open the lid of the water tank 5, pour the coolant into the water tank 5, and then it flows into the liquid filling pipe 6 and finally into the power battery liquid cooling system 1.

[0085] While the gas removal pipe 4 is in communication with the power battery liquid cooling system 1, it is also in communication with the water tank 5. After the gas removal of the power battery liquid cooling system 1 is completed, the gas discharged from the power battery liquid cooling system 1 is finally discharged into the water tank 5 through the gas removal pipe 4.

[0086] Figure 2 shows a schematic diagram of the composition of a power battery liquid cooling system according to an embodiment of the present invention Figure 1 in the present invention

[0087] Refer to Figure 2 As shown, in this embodiment, the water pump inlet pipe 7 is the part of the main pipeline connected to the water pump 2; the branch pipeline 8 is equivalent to a branch of the main pipeline, and the coolant in the main pipeline will be dispersed into the branch pipeline 8 according to the liquid flow direction of the branch pipeline shown in the figure; the liquid filling port 9 is the interface between the liquid filling pipeline 6 and the main pipeline

[0088] Based on the circulating flow direction of the coolant, that is, based on the liquid flow direction of the main pipeline shown in the figure, the water pump 2 is arranged in front of the one-way degassing valve 10, and the one-way degassing valve 10 is arranged in front of the solenoid valve 12. Thus, when the solenoid valve 12 is closed and the water pump 2 is turned on, the gas in the main pipeline will be concentrated and pushed towards the degassing port 11, and then discharged from the one-way degassing valve 10. Moreover, due to the one-way property of the one-way degassing valve 10, the gas will not return to the main pipeline through the one-way degassing valve 10

[0089] Among them, the degassing port 11 is the interface between the one-way degassing valve 10 and the main pipeline; the solenoid valve switch 14 is electrically connected to the solenoid valve 12 through the solenoid valve wire harness 13. The user can close the solenoid valve 12 by pressing the button of the solenoid valve switch 14

[0090] It should be noted that Figure 1 and Figure 2 only exemplarily shows alternative embodiments of the present invention, and should not limit the functions and usage scope of the present invention

[0091] Those skilled in the art will easily think of other implementation schemes of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the appended claims

Claims

1. A power battery liquid cooling system, characterized in that, Comprising: A main pipeline, which is in contact with the power battery and is used for allowing the coolant to circulate in the main pipeline to dissipate heat from the power battery; A water pump, which is arranged in the main pipeline and is used for driving the coolant to circulate in the main pipeline; A radiator, which is arranged in the main pipeline and is used for reducing the temperature of the coolant; A water tank, which is arranged above the main pipeline and is used for containing the coolant; A liquid replenishing pipeline, the two ends of which are respectively communicated with the main pipeline and the water tank and are used for transporting the coolant in the water tank to the main pipeline; An air vent valve, which is arranged at the air vent of the main pipeline and is communicated with the main pipeline and is used for discharging the gas in the main pipeline; An air vent pipeline, the two ends of which are respectively communicated with the air vent valve and the water tank and are used for discharging the gas in the main pipeline to the water tank; An electromagnetic valve, which is arranged in the main region of the main pipeline and is located between the air vent and the water pump. When the electromagnetic valve is opened, the coolant can circulate in the main pipeline. When the electromagnetic valve is closed, the coolant cannot circulate in the main pipeline; An electromagnetic valve switch, which is electrically connected to the electromagnetic valve and is used for opening or closing the electromagnetic valve; Wherein, the electromagnetic valve switch is also electrically connected to the water pump and is used for closing the electromagnetic valve and simultaneously opening the water pump; when the electromagnetic valve is closed, the water pump automatically starts to push the coolant towards the air vent, so that the air in the coolant is concentrated and extruded to the air vent and is unidirectionally discharged into the water tank through the air vent pipeline; the circulating flow direction of the coolant in the main pipeline is from the water pump to the air vent, then to the electromagnetic valve, and then back to the water pump.

2. The system according to claim 1, wherein The air vent valve is a one-way air vent valve, and the gas flow direction of the one-way air vent valve is from the inside of the main pipeline to the outside of the main pipeline.

3. The system according to claim 1, wherein The system further comprises: A water pump switch, which is electrically connected to the water pump and is used for opening or closing the water pump.

4. The system according to claim 1, wherein The system further comprises: Branch pipelines, each of which is in contact with a power battery, and the pipe orifices at both ends of each branch pipeline are arranged on the pipe wall of the main pipeline and are communicated with the main pipeline.

5. The system according to claim 4, wherein Both the water pump and the air vent valve are arranged in the main region of the main pipeline, wherein the main region is the region of the main pipeline that is not covered by any branch pipeline.

6. The system according to claim 4, wherein The inlet pipe orifices of each branch pipeline are co-located on an inlet plane, and the inlet plane is perpendicular to the main pipeline. Wherein, the coolant flows out of the main pipeline from the inlet pipe orifice of the branch pipeline and re-enters the main pipeline from the outlet pipe orifice of the branch pipeline.

7. The system according to claim 6, wherein The radiator is arranged between the water pump and the inlet plane.

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