Immersed battery cooling system

Abstract

An immersion battery cooling system relates to the technical field of energy storage equipment. It includes a battery module, a control system, and a cooling system. The battery module is electrically connected to the control system and the cooling system. The battery module includes a battery box, a battery cell, and an auxiliary liquid spraying pipe. The battery box is a sealed structure filled with coolant. The battery cell is arranged in the battery box. The auxiliary liquid spraying pipe is arranged on the side wall of the battery box, and the auxiliary liquid spraying pipe is located above the battery cell. By arranging the battery cell in a battery box soaked with coolant, and arranging a coolant auxiliary spraying pipe in the battery box to spray coolant from above the battery cell, the coolant is circulated and cooled under the control of the control system, which can not only realize all-round synchronous cooling of the battery cell, but also eliminate the risk of fire of the battery cell, and greatly improve the safety of the battery pack.

Description

Technical Field

[0001] The invention relates to an immersion battery cooling system and to the technical field of energy storage equipment. Background Art

[0002] Battery thermal management systems are critical to the safety of electrochemical energy storage systems. As battery energy density and discharge power increase, traditional heat dissipation solutions can no longer meet current battery heat dissipation requirements, which affects battery performance, life, and safety.

[0003] Traditional cold plate liquid cooling technology has its limitations, because the heat-generating part of the battery cell is mainly the pole ear, and the cooling plate of the plate liquid cooling is at the bottom of the battery cell, so the pole ear cannot be cooled directly. At present, it is very difficult to let the liquid cooling plate stick to the pole ear for cooling, which will affect the measurement of battery cell temperature and voltage. Therefore, most of them use air-cooling structure for cooling, but air-cooling has uneven cooling, and it cannot ensure that all battery cells are controlled at the same temperature. In addition, the air-cooling structure also has the risk of combustion in the event of a fault, and the safety is relatively low. Summary of the invention

[0004] The purpose of the present invention is to provide an immersion battery cooling system to address the defects or shortcomings in the prior art. The system places battery cells in a battery box soaked in coolant, and provides a coolant auxiliary nozzle in the battery box to spray coolant from above the battery cells. The coolant is circulated and cooled under the control of a control system. This not only achieves all-round synchronous cooling of the battery cells, but also eliminates the risk of battery cell fire, thereby greatly improving the safety of battery pack use.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it includes a battery module 1, a control system 2, and a cooling system. The battery module 1 is electrically connected to the control system 2 and the cooling system. The battery module 1 includes a battery box 11, a battery cell 12, and an auxiliary spray pipe 13. The battery box 11 is a sealed structure filled with coolant. The battery cell 12 is arranged in the battery box 11, and the auxiliary spray pipe 13 is arranged on the side wall of the battery box 11, and the auxiliary spray pipe 13 is located above the battery cell 12.

[0006] Furthermore, the auxiliary liquid spray pipe 13 includes a liquid guide pipe 131, a liquid inlet pipe 132, and a nozzle 133. The liquid inlet pipe 132 is arranged at the rear side of the middle of the liquid guide pipe 131 and passes through the battery box 11. A plurality of nozzles 133 are arranged in parallel at the front end of the liquid guide pipe 131, and the opening of the nozzle 133 is flush with the end surface of the battery cell 12.

[0007] Furthermore, a liquid inlet check valve 14 is disposed outside the battery box 11 , and the liquid inlet check valve 14 is connected to the liquid inlet pipe 132 .

[0008] Furthermore, a liquid outlet pipe 15 is provided at the lower part of the battery box 11 on the side opposite to the liquid inlet pipe 132 , and a liquid outlet one-way valve 16 is provided on the liquid outlet pipe 15 .

[0009] Furthermore, a liquid level display window 17 is provided on one side of the outer wall of the battery box 11, and a liquid level gauge 18 is provided on the liquid level display window 17. The detection head of the liquid level gauge 18 extends into the battery box 11, and the liquid level display window 17 and the liquid level gauge 18 are electrically connected to the control system 2.

[0010] Furthermore, a thermometer 101 is provided on one side of the outer wall of the battery box 11 , and the thermometer 101 is electrically connected to the control system 2 .

[0011] Furthermore, the cooling system includes a liquid constant temperature system 3, a liquid circulation pump 4, and a liquid replenishing tank 5. The liquid constant temperature system 3, the liquid circulation pump 4, and the liquid replenishing tank 5 are connected by pipelines. The liquid replenishing tank 5 is connected to the liquid outlet one-way valve 16, and the liquid circulation pump 4 is connected to the liquid inlet one-way valve 14.

[0012] Furthermore, the cooling system further comprises a flow meter 6 , one end of the flow meter 6 is connected to the liquid circulation pump 4 , and the other end of the flow meter 6 is connected to the liquid inlet one-way valve 14 .

[0013] Furthermore, a communication interface 102 is also provided outside the battery box 11 .

[0014] The working principle of the present invention is as follows: a plurality of battery cells 12 are immersed in a battery box 11 filled with coolant. When the energy storage system is working, the coolant is cooled to a certain temperature in the liquid constant temperature system, and then is pressurized and transmitted to the battery module 1 through the liquid circulation pump 4, and enters the auxiliary liquid spray pipe 13 from the liquid inlet check valve 14, and is sprayed out from the spray pipe 133. The sprayed coolant flows through the top of the battery cell 12, and there are gaps between the battery cells 12. Part of the coolant will flow downward along the gaps between the battery cells 12, and most of the coolant will flow in the battery box 11 along the spraying direction and circulate downward, so that the six sides of the battery cell 12 can be The coolant is kept in circulation, so that effective and rapid cooling can be achieved. The liquid level meter 18 and the thermometer 19 monitor the working status of the coolant in the battery box 11. When the liquid level drops or the coolant temperature rises, the control system controls the replenishing tank 5 to work, and provides new coolant to enter the liquid constant temperature system 3 to reach a certain temperature, and then enter the battery box 11. The original coolant in the battery box 11 is discharged from the liquid outlet one-way valve 16 and circulated back to the replenishing tank 5. In this way, the temperature in the battery module 1 can be maintained within the set range, thereby improving the working safety of the energy storage equipment.

[0015] After adopting the above technical scheme, the beneficial effect of the present invention is as follows: by arranging the battery cells in a battery box soaked with coolant, and arranging a coolant auxiliary nozzle in the battery box to spray coolant from above the battery cells, the coolant is circulated and cooled under the control of the control system, which not only can realize all-round synchronous cooling of the battery cells, but also eliminate the risk of battery cell fire, thereby greatly improving the safety of battery pack use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic diagram of the framework structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the battery module 1 of the present invention;

[0019] Figure 3 yes Figure 1 AA section view;

[0020] Figure 4 Schematic diagram of the coordination state between the auxiliary liquid spray pipe 13 and the battery core 12 in the present invention

[0021] Figure 5 It is a schematic structural diagram of the auxiliary liquid spray pipe 13 in the present invention.

[0022] Explanation of the accompanying drawings: battery module 1, control system 2, liquid constant temperature system 3, liquid circulation pump 4, liquid replenishing tank 5, flow meter 6, battery box 11, battery cell 12, auxiliary liquid spray pipe 13, liquid inlet check valve 14, liquid outlet pipe 15, liquid outlet check valve 16, liquid level display window 17, liquid level meter 18, thermometer 101, communication interface 102. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 5As shown, the technical solution adopted in this specific implementation is: it includes a battery module 1, a control system 2, and a cooling system. The battery module 1 is electrically connected to the control system 2 and the cooling system. The battery module 1 includes a battery box 11, a battery cell 12, and an auxiliary liquid spray pipe 13. The battery box 11 is a sealed structure, which is filled with coolant. The battery cell 12 is arranged in the battery box 11, and the auxiliary liquid spray pipe 13 is arranged on the side wall of the battery box 11, and the auxiliary liquid spray pipe 13 is located above the battery cell 12. In this embodiment, the battery module, the control system, and the cooling system constitute an energy storage system. The battery module is provided with several groups, and the battery module is mainly composed of a sealed battery box and several battery cells. The battery box is filled with coolant, and the battery cell is immersed in the coolant, thereby avoiding the occurrence of uneven cooling. Since the battery cell is immersed in the coolant, it cannot catch fire even if a fault occurs, thereby avoiding the occurrence of fire. Since the heat is directly dissipated, the efficiency is higher and the energy consumption is lower.

[0024] In order to make the coolant circulate better in the battery box to cool the battery cells, an auxiliary spray pipe is also set up. External coolant is sprayed into the battery box from the auxiliary spray pipe, so that the coolant keeps flowing in the battery box, achieving uniform cooling of the six sides of the battery cells, thereby effectively improving the cooling effect and the safety of the energy storage equipment.

[0025] The control system includes a data transmission module and a control module, which can set the specific coolant circulation mode and temperature control.

[0026] More specifically, the auxiliary liquid spray pipe 13 includes a liquid guide pipe 131, a liquid inlet pipe 132, and a nozzle 133. The liquid inlet pipe 132 is arranged at the rear side of the middle part of the liquid guide pipe 131 and passes through the battery box 11. A plurality of nozzles 133 are arranged in parallel at the front end of the liquid guide pipe 131, and the opening of the nozzle 133 is flush with the end face of the battery cell 12. In this embodiment, the auxiliary liquid spray pipe is a spray pipe structure, and the liquid guide pipe is a hollow horizontal pipe. The front end thereof is a plurality of nozzles arranged in parallel, and the rear end is a liquid inlet pipe. The coolant enters from the liquid inlet pipe and is distributed from the liquid guide pipe to each nozzle, and the surface of the battery cell is fully sprayed to achieve stable circulation of the coolant.

[0027] More specifically, a liquid inlet check valve 14 is provided outside the battery box 11, and the liquid inlet check valve 14 is connected to the liquid inlet pipe 132. By providing a check valve, the backflow of the coolant during installation and maintenance can be prevented, thereby reducing the loss of the coolant.

[0028] To be more specific, a liquid outlet pipe 15 is provided at the lower part of the battery box 11 on the side opposite to the liquid inlet pipe 132, and a liquid outlet check valve 16 is provided on the liquid outlet pipe 15. Similarly, providing a check valve on the liquid outlet pipe can prevent the backflow of the coolant during installation and maintenance, thereby reducing the loss of the coolant.

[0029] To be more specific, a liquid level display window 17 is provided on one side of the outer wall of the battery box 11, and a liquid level gauge 18 is provided on the liquid level display window 17. The detection head of the liquid level gauge 18 extends into the battery box 11, and the liquid level display window 17 and the liquid level gauge 18 are electrically connected to the control system 2. By setting the liquid level gauge, the use of the coolant in the battery box can be monitored, and the specific data is displayed through the liquid level display window. After the data is fed back to the control system, the control system determines whether a refilling cycle is needed according to the set data to increase the retention amount of the coolant.

[0030] To be more specific, a thermometer 101 is also provided on one side of the outer wall of the battery box 11. The thermometer 101 is electrically connected to the control system 2. The thermometer monitors the temperature of the coolant in the battery box and feeds back to the control system. The control system determines whether it is necessary to start the circulation and the circulation speed, thereby accurately controlling the temperature of the coolant in the battery box.

[0031] To be more specific, the cooling system includes a liquid constant temperature system 3, a liquid circulation pump 4, and a liquid replenishing tank 5. The liquid constant temperature system 3, the liquid circulation pump 4, and the liquid replenishing tank 5 are connected by pipelines. The liquid replenishing tank 5 is connected to the liquid outlet one-way valve 16, and the liquid circulation pump 4 is connected to the liquid inlet one-way valve 14. In this embodiment, the cooling system is composed of multiple parts, among which the liquid constant temperature system can control the temperature of the coolant, mainly for cooling. The coolant in the liquid replenishing tank is re-temperature-controlled in the liquid constant temperature system and then transmitted to the battery box by the liquid circulation pump. At the same time, the coolant in the battery box will circulate back to the liquid replenishing tank, thereby forming a cycle to achieve precise control of the battery cell temperature.

[0032] More specifically, the cooling system also includes a flow meter 6, one end of the flow meter 6 is connected to the liquid circulation pump 4, and the other end is connected to the liquid inlet check valve 14. The flow meter detects the flow rate of the coolant, so that the control system can accurately control the circulation speed of the coolant and achieve precise constant temperature.

[0033] To be more specific, a communication interface 102 is further provided on the outside of the battery box 11 , and the communication interface is connected to the control system to enable the control system to control the battery cells and various components.

[0034] The working principle of the present invention is as follows: a plurality of battery cells 12 are immersed in a battery box 11 filled with coolant. When the energy storage system is working, the coolant is cooled to a certain temperature in the liquid constant temperature system, and then is pressurized and transmitted to the battery module 1 through the liquid circulation pump 4, and enters the auxiliary liquid spray pipe 13 from the liquid inlet check valve 14, and is sprayed out from the spray pipe 133. The sprayed coolant flows through the top of the battery cell 12, and there are gaps between the battery cells 12. Part of the coolant will flow downward along the gaps between the battery cells 12, and most of the coolant will flow in the battery box 11 along the spraying direction and circulate downward, so that the six sides of the battery cell 12 can be The coolant is kept in circulation, so that effective and rapid cooling can be achieved. The liquid level meter 18 and the thermometer 19 monitor the working status of the coolant in the battery box 11. When the liquid level drops or the coolant temperature rises, the control system controls the replenishing tank 5 to work, and provides new coolant to enter the liquid constant temperature system 3 to reach a certain temperature, and then enter the battery box 11. The original coolant in the battery box 11 is discharged from the liquid outlet one-way valve 16 and circulated back to the replenishing tank 5. In this way, the temperature in the battery module 1 can be maintained within the set range, thereby improving the working safety of the energy storage equipment.

[0035] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An immersion battery cooling system, characterized in that: It comprises a battery module (1), a control system (2) and a cooling system. The battery module (1) is electrically connected to the control system (2) and the cooling system. The battery module (1) comprises a battery box (11), a battery cell (12) and an auxiliary liquid spraying pipe (13). The battery box (11) is a sealed structure filled with cooling liquid. The battery cell (12) is arranged in the battery box (11). The auxiliary liquid spraying pipe (13) is arranged on the side wall of the battery box (11), and the auxiliary liquid spraying pipe (13) is located above the battery cell (12).

2. The immersion battery cooling system according to claim 1, characterized in that: The auxiliary liquid spray pipe (13) comprises a liquid guide pipe (131), a liquid inlet pipe (132), and a nozzle (133); the liquid inlet pipe (132) is arranged at the rear side of the middle of the liquid guide pipe (131) and passes through the battery box (11); a plurality of nozzles (133) are arranged in parallel at the front end of the liquid guide pipe (131), and the opening of the nozzle (133) is flush with the end surface of the battery cell (12).

3. The immersion battery cooling system according to claim 1, characterized in that: A liquid inlet check valve (14) is arranged outside the battery box (11), and the liquid inlet check valve (14) is connected to the liquid inlet pipe (132).

4. The immersion battery cooling system according to claim 1, characterized in that: A liquid outlet pipe (15) is provided at the lower part of the battery box (11) on the side opposite to the liquid inlet pipe (132), and a liquid outlet one-way valve (16) is provided on the liquid outlet pipe (15).

5. The immersion battery cooling system according to claim 1, characterized in that: A liquid level display window (17) is provided on one side of the outer wall of the battery box (11), a liquid level gauge (18) is provided on the liquid level display window (17), a detection head of the liquid level gauge (18) extends into the battery box (11), and the liquid level display window (17), the liquid level gauge (18) and the control system (2) are electrically connected.

6. The immersion battery cooling system according to claim 1, characterized in that: A thermometer (101) is also provided on one side of the outer wall of the battery box (11), and the thermometer (101) is electrically connected to the control system (2).

7. The immersion battery cooling system according to claim 1, characterized in that: The cooling system comprises a liquid constant temperature system (3), a liquid circulation pump (4), and a liquid replenishing tank (5); the liquid constant temperature system (3), the liquid circulation pump (4), and the liquid replenishing tank (5) are connected via pipelines; the liquid replenishing tank (5) is connected to a liquid outlet one-way valve (16); and the liquid circulation pump (4) is connected to a liquid inlet one-way valve (14).

8. The immersion battery cooling system according to claim 1, characterized in that: The cooling system further comprises a flow meter (6), one end of the flow meter (6) is connected to the liquid circulation pump (4), and the other end is connected to the liquid inlet non-return valve (14).

9. The immersion battery cooling system according to claim 1, characterized in that: A communication interface (102) is also provided on the outside of the battery box (11).

Images