Liquid-cooling piping assembly and energy storage battery system

Abstract

The present application discloses a liquid-cooling piping assembly and an energy storage battery system. The liquid-cooling piping assembly comprises liquid-cooling piping and a magnetic attraction member, wherein the liquid-cooling piping is configured to convey a cooling liquid; and the magnetic attraction member is mounted on the liquid-cooling piping so as to attract metal impurities in the cooling liquid.

Description

Liquid cooling pipe assembly and energy storage battery system

[0001] The present application claims priority to Chinese Patent Application No. 202411333148.7, 202422338314.4, filed on September 24, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a liquid cooling pipe assembly and an energy storage battery system. BACKGROUND

[0003] In a large battery energy storage system, a battery module generates a large amount of heat during charging and discharging. Therefore, the energy storage system needs to use effective cooling technology to dissipate heat, so as to quickly transfer the heat generated by the battery to the heat source medium and control the temperature of the battery module through heat exchange.

[0004] At present, some energy storage batteries use immersion liquid cooling method to cool down. The immersion liquid cooling system directly immerses the battery module in the cooling liquid, and then removes the heat through the circulating cooling liquid. SUMMARY

[0005] However, since the cooling liquid is in direct contact with the battery module, if the cooling liquid contains impurities, it may have a negative impact on the battery module. Especially during the battery production process, it is difficult to avoid leaving some metal dust inside the box where the battery module is placed. These metal dusts have certain electrical conductivity and will flow along with the cooling liquid during circulation, thereby easily causing short circuit and other faults of the battery system.

[0006] In a first aspect, embodiments of the present application provide a liquid cooling pipe assembly applied in an energy storage battery system, comprising:

[0007] A liquid cooling pipe configured to transport a cooling liquid;

[0008] A magnetic attraction element installed on the liquid cooling pipe to adsorb metal impurities in the cooling liquid.

[0009] In a second aspect, embodiments of the present application provide an energy storage battery system, comprising:

[0010] The liquid cooling pipe assembly as above;

[0011] A battery pack comprising a first shell and a battery module, the first shell being provided with an inner cavity, and the battery module being located in the inner cavity, and the inner cavity being further configured to accommodate the cooling liquid for immersing the battery module;

[0012] A liquid cooling device connected to the inner cavity through the liquid cooling pipe to transport the cooling liquid between the inner cavity and the liquid cooling device. Advantages

[0013] The liquid cooling pipe assembly related to the present application comprises a liquid cooling pipe and a magnetic attraction member, wherein the liquid cooling pipe is configured to transport cooling liquid, and the magnetic attraction member is installed on the liquid cooling pipe to adsorb metal impurities in the cooling liquid. Thus, when the metal impurities flow through the area provided with the magnetic attraction member along with the cooling liquid, the metal impurities will be adsorbed by the magnetic attraction member to avoid the metal impurities continuing to flow along with the cooling liquid as much as possible. Thus, the liquid cooling pipe assembly related to the present application can avoid the further flow of metal impurities in the cooling liquid as much as possible, thereby effectively reducing the spread of metal impurities in the cooling liquid, and further protecting external equipment to be cooled, such as energy storage battery systems, etc., from damage caused by metal impurities. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 is a schematic diagram showing some possible implementations of the energy storage battery system related to the present application.

[0015] Fig. 2 is a schematic diagram showing some possible implementations of the liquid cooling pipe assembly related to the present application.

[0016] Fig. 3 is a cross-sectional view showing some possible implementations of the liquid cooling pipe assembly related to the present application.

[0017] Fig. 4 is an exploded view showing some possible implementations of the liquid cooling pipe assembly related to the present application.

[0018] Fig. 5 is a cross-sectional view showing some other possible implementations of the liquid cooling pipe assembly related to the present application.

[0019] Fig. 6 is an exploded view showing some other possible implementations of the liquid cooling pipe assembly related to the present application.

[0020] Fig. 7 is a schematic diagram showing some other possible implementations of the energy storage battery system related to the present application.

[0021] Fig. 8 is a partial structural schematic diagram showing some possible implementations of the energy storage battery system related to the present application.

[0022] Fig. 9 is a partial structural schematic diagram showing some other possible implementations of the energy storage battery system related to the present application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, liquid cooling pipeline assembly; 11, liquid cooling pipeline; 111, convex part; 12, magnetic attraction element; 121, first magnetic attraction element; 122, second magnetic attraction element; 123, magnetic attraction part; 2, battery pack; 21, first shell; 211, inner cavity; 22, second shell; 221, containing cavity; 222, liquid outlet; 3, liquid cooling device; 31, liquid cooling system controller; 32, flow rate sensor; 33, resistance sensor; 34, third water pump; 4, liquid leakage collection device; 5, electromagnetic valve; 6, liquid level detection device; 61, first liquid level sensor; 62, second liquid level sensor; 7, second water pump; 8, battery management system. Embodiments of the application

[0025] Referring to FIG. 1 and FIG. 2, the application provides a liquid cooling pipeline assembly 1 applied in an energy storage battery system. The liquid cooling pipeline assembly 1 comprises a liquid cooling pipeline 11 configured to transport cooling liquid and a magnetic attraction element 12 installed on the liquid cooling pipeline 11 to attract metal impurities in the cooling liquid.

[0026] According to the above structure, in the liquid cooling pipeline assembly 1, when the metal impurities flow through the region provided with the magnetic attraction element 12 along with the cooling liquid, the metal impurities will be attracted by the magnetic attraction element 12 to avoid the metal impurities continuing to flow along with the cooling liquid as much as possible. Therefore, the liquid cooling pipeline assembly 1 involved in the application can avoid the further flow of metal impurities in the cooling liquid as much as possible, thereby effectively reducing the spread of metal impurities in the cooling liquid, and further protecting external cooling equipment, such as an energy storage battery system, from potential damage caused by metal impurities.

[0027] In some examples, the magnetic attraction element 12 can be arranged outside the liquid cooling pipeline 11, so that the magnetic attraction element 12 avoids interfering with the normal flow of the cooling liquid in the liquid cooling pipeline 11. In other examples, the magnetic attraction element 12 can also be arranged inside the liquid cooling pipeline 11. It can be understood that when the magnetic attraction element 12 is arranged inside the liquid cooling pipeline 11, the pipe diameter of the liquid cooling pipeline 11 corresponding to the position of the magnetic attraction element 12 needs to be set larger to avoid the magnetic attraction element 12 affecting the flow of the cooling liquid as much as possible.

[0028] In some embodiments, the magnetic attraction element 12 can be a permanent magnet such as a neodymium iron boron magnet, a cobalt magnet, a ferrite magnet, etc.

[0029] Referring to FIG. 3 and FIG. 4, in some embodiments, the magnetic member 12 includes a first magnetic member 121 and a second magnetic member 122. The first magnetic member 121 and the second magnetic member 122 are arranged on the outer wall of the liquid cooling pipe 11, and the first magnetic member 121 and the second magnetic member 122 are magnetically connected and jointly surround the liquid cooling pipe 11. In this way, the first magnetic member 121 and the second magnetic member 122 are simple and convenient to install, and can be easily connected or detached during use. When the liquid cooling pipe 11 needs to be replaced, the user can also detach the first magnetic member 121 and the second magnetic member 122 from the old liquid cooling pipe 11, and occasionally reinstall the first magnetic member 121 and the second magnetic member 122 on the new liquid cooling pipe 11. In addition, since the first magnetic member 121 and the second magnetic member 122 are arranged on the outer wall of the liquid cooling pipe 11, the user can also flexibly adjust the position of the magnetic member 12 according to the use condition, and magnetically attract the first magnetic member 121 and the second magnetic member 122 to different areas on the liquid cooling pipe 11.

[0030] Referring to FIG. 5, in some embodiments, the magnetic member 12 has a cylindrical structure, and the magnetic member 12 is sleeved on the liquid cooling pipe 11. Specifically, the inner wall of the magnetic member 12 having a cylindrical structure can be tightly attached to the outer wall of the liquid cooling pipe 11, thereby achieving better magnetic attraction effect to sufficiently adsorb metal impurities in the cooling liquid.

[0031] Referring to FIG. 6, in some examples, the magnetic member 12 includes a plurality of magnetic members 123 and a fixing member (not shown in the figure). The plurality of magnetic members 123 are arranged around the circumference of the outer wall of the liquid cooling pipe 11, and there is a gap between adjacent two magnetic members 123. The fixing member is connected to the plurality of magnetic members 123 and is arranged to fix the magnetic members 123 to the liquid cooling pipe 11. Since there is a gap between adjacent two magnetic members 123, the use of magnetic member 12 material can be reduced, thereby saving costs. It can be understood that due to the magnetic attraction of the magnetic member 123, even if there is a gap between adjacent two magnetic members 123, it will not significantly affect the adsorption of metal impurities. Specifically, the size of the gap between adjacent two magnetic members 123 can be arranged according to the size of the liquid cooling pipe 11, so that it does not significantly affect the adsorption of metal impurities. In some examples, the fixing member can be a rope, which can bind the plurality of magnetic members 123 to the outer wall of the liquid cooling pipe 11. In other examples, the magnetic member 12 can be first glued to the rope, and then the rope with the magnetic member 12 adhered thereto is bound to the liquid cooling pipe 11.

[0032] Referring to FIG. 2, in some embodiments, the surface of the liquid cooling pipe 11 is provided with two protrusions 111, which are spaced apart along the extension direction of the liquid cooling pipe 11, and the magnetic attraction member 12 is located between the two protrusions 111. Thus, the two protrusions 111 can limit the magnetic attraction member 12 to avoid sliding on the liquid cooling pipe 11. Specifically, the two ends of the magnetic attraction member 12 in the extension direction of the liquid cooling pipe 11 can abut against the two protrusions 111, respectively. The protrusions 111 can be integrally formed with the liquid cooling pipe 11.

[0033] In some embodiments, the liquid cooling pipe 11 includes a magnetic attraction section and a conventional section, the magnetic attraction member 12 is arranged in the magnetic attraction section, and the magnetic attraction section is detachably connected with the conventional section. Thus, when the magnetic attraction section adsorbs too many metal impurities, the staff can detach the magnetic attraction section from the conventional section to clean or replace the magnetic attraction section. It can be understood that when the magnetic attraction section adsorbs too many metal impurities, the inner diameter of the magnetic attraction section will become narrow, thereby affecting the flow of the cooling liquid. In addition, when the magnetic attraction section adsorbs too many metal impurities, the magnetic attraction effect of the magnetic attraction member 12 will also decrease, thereby affecting the continuous adsorption of metal impurities. Therefore, in this embodiment, the magnetic attraction section is arranged in a detachable structure.

[0034] In some examples, the end region of the magnetic attraction section can be provided with an internal thread, and the end region of the conventional section can be provided with an external thread, and the two are connected and fixed by screwing. In addition, in order to improve the sealing connection effect of the magnetic attraction section and the conventional section, a sealing ring can be arranged at the connection position to prevent the leakage of the cooling liquid.

[0035] In other examples, the end of the magnetic attraction section is provided with a first flange plate, the end of the conventional section is provided with a second flange plate, and the first flange plate and the second flange plate are fastened by bolt cooperation. A sealing gasket can be arranged between the first flange plate and the second flange plate to ensure the sealing property of the connection position.

[0036] The application also provides a storage battery system, which includes the liquid cooling pipe assembly 1, the battery pack 2 and the liquid cooling device 3 as described above. The battery pack 2 includes a first shell and a battery module, the first shell is provided with an inner cavity, the battery module is located in the inner cavity, and the inner cavity is also arranged to contain the cooling liquid for soaking the battery module; the liquid cooling device 3 is connected with the inner cavity through the liquid cooling pipe 11 to transport the cooling liquid between the inner cavity and the liquid cooling device 3. Thus, the battery module of the storage battery system is soaked in the cooling liquid, and the storage battery system adopts the immersion liquid cooling mode. The immersion liquid cooling system can quickly absorb heat and take it to the external circulation for cooling, which ensures that the battery operates in the optimal temperature range and effectively suppresses the thermal runaway of the battery, thereby improving the safety of the battery.

[0037] In the energy storage battery system involved in the present application, since the cooling liquid enters the inside of the battery pack, the liquid cooling pipe assembly 1 is adopted to realize the adsorption of metal impurities, so as to reduce the flow of metal impurities into the battery pack 2 of the energy storage battery system as much as possible, thereby avoiding the influence of metal impurities on the normal work of the energy storage battery system as much as possible.

[0038] It can be understood that the liquid cooling pipe assembly 1 can also be used in a cold plate type liquid cooling system. The liquid cooling system using the cold plate transmits heat through the cold plate which is in contact with the battery module. When the battery module transmits heat to the cold plate, the cooling liquid in the cold plate absorbs the heat and carries away the heat through the circulating system. Using the liquid cooling pipe assembly 1 in the cold plate type liquid cooling system can also adsorb the metal impurities in the cooling liquid, avoiding the influence of metal impurities on the heat conduction efficiency of the cooling liquid, thereby affecting the heat dissipation performance of the liquid cooling system.

[0039] Referring to FIG. 1, in some embodiments, the liquid cooling device 3 further comprises a flow rate sensor 32 arranged in the liquid cooling pipe 11 to detect the flow rate of the cooling liquid. Specifically, the liquid cooling system controller 31 can indirectly determine whether there is a metal impurity accumulation in the cooling system by measuring the flow rate through the flow rate sensor 32 detecting the flow speed of the cooling liquid. If too much metal impurities accumulate in the liquid cooling pipe 11, it will cause the inner diameter of the liquid cooling pipe 11 to narrow, and thus the flow rate of the cooling liquid will increase. When the flow rate sensor 32 detects that the flow rate of the cooling liquid is higher than the preset normal range, it may indicate that there is a blockage in the pipe. At this time, the liquid cooling system controller 31 can issue an alarm to prompt the staff to clean or replace the liquid cooling pipe 11.

[0040] In some embodiments, the liquid cooling pipe 11 comprises a magnetic attraction section corresponding to the magnetic attraction member 12, and the flow rate sensor 32 is located in the magnetic attraction section. Specifically, when the metal impurities are adsorbed in the magnetic attraction section, the inner diameter of the magnetic attraction section will become narrow, and thus the flow rate sensor 32 located in the magnetic attraction section can more obviously detect the change of the flow rate of the cooling liquid.

[0041] Referring to FIG. 1, in other embodiments, the liquid cooling pipe 11 comprises a magnetic attraction section corresponding to the magnetic attraction member 12, and the flow rate sensor 32 is located downstream of the magnetic attraction section in the flow direction of the cooling liquid. Specifically, the flow rate sensor 32 can be located at the connection between the magnetic attraction section and the conventional section.

[0042] In some examples, the magnetic attraction section can be located upstream of the battery pack 2 in the flow direction of the cooling liquid. It can be understood that the metal impurities can be adsorbed and retained when the cooling liquid passes through the magnetic attraction section, so that the cooling liquid can reduce the re-entry of metal dust into the battery pack 2 during the circulation of the cooling liquid as much as possible.

[0043] In some examples, the magnetic attraction member 12 can be provided with one or more, which can be set by the user according to the actual situation such as the length of the liquid cooling pipe 11.

[0044] Referring to FIG. 1, in some embodiments, the liquid cooling device 3 further comprises a resistance sensor 33 and / or a conductivity sensor, which is arranged in the liquid cooling pipe 11 to detect the concentration of metal impurities in the cooling liquid. Since the conductivity of the cooling liquid increases when there are more metal impurities in it, the resistance sensor 33 can indirectly infer the degree of pollution by measuring the resistance value of the cooling liquid, or the conductivity sensor can directly measure the conductivity of the cooling liquid.

[0045] Specifically, when the liquid cooling device uses a resistance sensor 33, the higher the content of metal impurities in the cooling liquid, the lower the resistance value is usually. When the cooling liquid is contaminated by metal impurities, the resistance value will change. If the current resistance value is lower than the preset value, it indicates that the content of metal impurities in the cooling liquid exceeds the normal range, and then the liquid cooling system controller 31 can issue an alarm according to the degree of pollution to prompt the staff to replace the cooling liquid. When the liquid cooling device uses a conductivity sensor, the higher the content of metal impurities in the cooling liquid, the higher the conductivity is usually. When the cooling liquid is contaminated by metal impurities, the conductivity will change. If the conductivity is higher than the preset value, it indicates that the content of metal impurities in the cooling liquid exceeds the normal range, and then the liquid cooling system controller 31 can issue an alarm according to the degree of pollution to prompt the staff to replace the cooling liquid.

[0046] It can be understood that the liquid cooling device 3 further comprises a third water pump 34 connected with the liquid cooling pipe 11, which is arranged to circulate the cooling liquid from the water tank in the liquid cooling device 3 to the inner cavity of the battery pack 2, so that the cooling liquid can flow through the battery module and take away the heat generated by the battery module during charging and discharging.

[0047] In summary, in the liquid cooling pipe assembly 1, when the metal impurities flow through the area provided with the magnetic attraction member 12 along with the cooling liquid, the metal impurities will be attracted by the magnetic attraction member 12 to avoid the metal impurities continuing to flow in the cooling liquid as much as possible. Thus, the liquid cooling pipe assembly 1 of the present application can reduce the flow and spread of metal impurities in the cooling liquid, thereby protecting the external cooling equipment such as energy storage batteries.

[0048] Referring to FIG. 7 and FIG. 8, in some embodiments, the energy storage battery system further comprises a second housing 22 provided with a receiving cavity 221, and the first housing 21 is arranged in the receiving cavity 221, and the receiving cavity 221 is arranged to collect the cooling liquid leaked from the inner cavity 211.

[0049] According to the above structure, in the energy storage battery system of the present application, the second shell 22 of the battery pack 2 is sleeved on the first shell 21, when the first shell 21 leaks the cooling liquid, the accommodating cavity 221 of the second shell 22 can preliminarily store the leaked cooling liquid, thereby effectively avoiding the leaked cooling liquid flowing out of the energy storage battery system to pollute the surrounding environment.

[0050] Referring to FIG. 7, in some embodiments, the energy storage battery system further comprises a liquid leakage collecting device 4, which is respectively connected to the accommodating cavity 221 and the liquid cooling device 3, and can collect the cooling liquid in the accommodating cavity 221 and deliver the cooling liquid to the liquid cooling device 3. Thus, the arrangement of the liquid leakage collecting device 4 can also collect the cooling liquid in the accommodating cavity 221, thereby avoiding the excessive cooling liquid in the accommodating cavity 221 from leaking again. Moreover, the cooling liquid collected by the liquid leakage collecting device 4 can be delivered to the liquid cooling device 3 again, so that the leaked cooling liquid reenters the circulation of the energy storage battery system, reducing the waste of the cooling liquid.

[0051] It can be understood that the liquid cooling device 3 is provided with a water tank configured to store the cooling liquid, and the water tank is connected to the inner cavity 211 of the first shell 21 through the liquid cooling pipeline 11. In the related art, when the cooling liquid in the inner cavity 211 leaks, the amount of the cooling liquid in the inner cavity 211 is continuously reduced, and the cooling liquid in the water tank needs to be delivered to the inner cavity 211 to supplement the cooling liquid in the inner cavity 211, so as to avoid the insufficient cooling liquid in the inner cavity 211 from affecting the heat exchange of the battery module. However, after the cooling liquid leaks, the total amount of the cooling liquid in the energy storage battery system is reduced, and usually the staff needs to add the cooling liquid to the water tank to avoid affecting the normal use of the battery energy storage system. Thus, by arranging the liquid leakage collecting device 4, the leaked liquid can be recovered, and the leaked liquid can also be delivered to the liquid cooling device 3 again, so that the leaked cooling liquid reenters the circulation of the energy storage battery system, and the number of times of adding the cooling liquid by the staff is reduced, thereby reducing the workload of the staff.

[0052] In some embodiments, the energy storage battery system comprises a plurality of battery packs 2, and the accommodating cavities 221 of the plurality of battery packs 2 are connected to the same liquid leakage collecting device 4. In this way, one liquid leakage collecting device 4 can simultaneously collect the cooling liquid delivered from the accommodating cavities 221 of the plurality of battery packs 2, and it is not necessary to independently arrange the liquid leakage collecting device 4 for each battery pack 2, thereby reducing the connection structure and the number of components, thereby reducing the complexity of the structure, reducing the material cost and the installation cost. In addition, the maintenance cost can also be reduced, and the staff only needs to maintain one liquid leakage collecting device 4. Thus, the design of connecting the accommodating cavities 221 of the plurality of battery packs 2 to the same liquid leakage collecting device 4 can not only improve the economy of the energy storage battery system, but also improve the management efficiency.

[0053] Of course, in some examples, a separate liquid leakage collection device 4 can also be connected to each battery pack 2, so that the liquid leakage of each battery pack 2 can be directly monitored in the corresponding liquid leakage collection device 4.

[0054] Referring to FIG. 7, in some embodiments, the liquid leakage collection device 4 is located below the accommodation cavity 221 in the direction of gravity, so that the cooling liquid in the accommodation cavity 221 flows into the liquid leakage collection device 4. In this way, the leaked cooling liquid can flow into the liquid leakage collection device 4 naturally by gravity, without the need for additional power or pumping systems, and without the need for complex conveying structures, thereby reducing the use cost. Moreover, since the liquid leakage collection device 4 is located below, the leaked cooling liquid can be quickly collected, reducing the risk of cooling liquid leaking into the external environment and improving the safety performance of the energy storage battery system.

[0055] In some embodiments, the energy storage battery system further comprises a first water pump connected between the accommodation cavity 221 and the liquid leakage collection device 4, and the first water pump is configured to convey the cooling liquid in the accommodation cavity 221 to the liquid leakage collection device 4. In this way, when the liquid leakage collection device 4 is located higher than the accommodation cavity 221, the first water pump can convey the cooling liquid into the accommodation cavity 221. With this structure, the energy storage battery system can flexibly arrange the battery pack 2, the liquid cooling device 3 and the liquid leakage collection device 4 according to the actual situation, and even without relying on gravity, the first water pump can ensure that the cooling liquid in the cavity 211 of the battery pack 2 can effectively flow to the liquid leakage collection device 4.

[0056] Referring to FIG. 9, in some embodiments, the energy storage battery system further comprises an electromagnetic valve 5 and a liquid level detection device 6. The electromagnetic valve 5 is connected to the liquid outlet 222 of the accommodation cavity 221, and the electromagnetic valve 5 is configured to open or close the liquid outlet 222. The liquid level detection device 6 is arranged in the accommodation cavity 221, and the liquid level detection device 6 is connected to the electromagnetic valve 5. When the liquid level detection device 6 detects that the cooling liquid reaches a preset height, the liquid level detection device 6 triggers the electromagnetic valve 5 to open or close the liquid outlet 222. Specifically, the energy storage battery system comprises a battery management system 8. When the liquid level detection device 6 detects that the cooling liquid in the accommodation cavity 221 is too much and the liquid level has reached the preset height, the battery management system 8 will receive a signal from the liquid level detection device 6. After the battery management system 8 receives the signal that the liquid level has reached the preset height, the battery management system 8 will control the electromagnetic valve 5 to open the liquid outlet 222, so that the cooling liquid flows out of the accommodation cavity 221 and flows to the liquid leakage collection device 4. When the liquid level in the accommodation cavity 221 drops to a safe position, the liquid level detection device 6 will send a signal to the battery management system 8, and the battery management system 8 will control the electromagnetic valve 5 to close the liquid outlet 222 after receiving the signal.

[0057] Referring to FIG. 9, in some embodiments, the liquid level detection device 6 comprises a first liquid level sensor 61 and a second liquid level sensor 62, and the second liquid level sensor 62 is located below the first liquid level sensor 61 along the direction of gravity; the first liquid level sensor 61 is configured to trigger the electromagnetic valve 5 to open the liquid outlet 222 when the liquid level of the coolant reaches a first position; and the second liquid level sensor 62 is configured to trigger the electromagnetic valve 5 to close the liquid outlet 222 when the liquid level of the coolant reaches a second position. Thus, through the cooperation of the first liquid level sensor 61 and the second liquid level sensor 62, precise control of the outflow of the coolant from the containing cavity 221 can be achieved. The first liquid level sensor 61 is configured to prompt the opening of the valve, i.e., when the coolant reaches the first position, it indicates that the coolant needs to be discharged, and then the electromagnetic valve 5 opens the liquid outlet 222; the second liquid level sensor 62 is configured to prompt the closing of the valve, i.e., when the coolant reaches the second position, it indicates that the coolant in the containing cavity 221 has flowed out a sufficient amount or has completely flowed out, and then the electromagnetic valve 5 closes the liquid outlet 222. Specifically, when the coolant in the inner cavity 211 leaks and the coolant leaks into the containing cavity 221, and the liquid level of the coolant rises to the first position, the first liquid level sensor 61 detects the change in the liquid level and sends a signal to the battery management system 8. After the battery management system 8 receives the signal from the first liquid level sensor 61, it controls the electromagnetic valve 5 to open the liquid outlet 222, so that the coolant flows out of the containing cavity 221 and flows to the liquid leakage collection device 4. When the coolant drops to the second position, the second liquid level sensor 62 detects the change in the liquid level and sends a signal to the battery management system 8, and after the battery management system 8 receives the signal, it controls the electromagnetic valve 5 to close the liquid outlet 222.

[0058] In some embodiments, the liquid level detection device 6 comprises a third liquid level sensor; the third liquid level sensor triggers the electromagnetic valve 5 to open the liquid outlet 222 when the cooling liquid reaches a first preset position; the third liquid level sensor triggers the electromagnetic valve 5 to close the liquid outlet 222 when the cooling liquid reaches a second preset position; the second preset position is below the first preset position. In this way, the energy storage battery system can only be provided with one third liquid level sensor, which is configured to detect whether the cooling liquid reaches the first preset position or the second preset position, so as to trigger the electromagnetic valve 5 to open or close the liquid outlet 222. Specifically, when the cooling liquid is below the first preset position, the third liquid level sensor does not detect that the cooling liquid reaches the first preset position, and the electromagnetic valve 5 is in a closed state. When the cooling liquid in the inner cavity 211 leaks and flows into the containing cavity 221, the liquid level of the cooling liquid rises to the first preset position, and the third liquid level sensor detects the change in the liquid level and sends an opening signal to the battery management system 8. After receiving the signal from the third liquid level sensor, the battery management system 8 controls the electromagnetic valve 5 to open the liquid outlet 222. The cooling liquid flows from the liquid outlet 222 to the liquid leakage collection device 4, and the liquid level in the containing cavity 221 begins to drop. After the cooling liquid flows for a period of time, the liquid level drops to the second preset position, and the third liquid level sensor detects the change in the liquid level again. According to the preset logic, the third liquid level sensor sends a closing signal to the battery management system 8. After receiving the signal from the third liquid level sensor, the battery management system 8 controls the electromagnetic valve 5 to close the liquid outlet 222.

[0059] Referring to FIG. 7, in some embodiments, the energy storage battery system further comprises a second water pump 7, which is connected between the liquid leakage collection device 4 and the liquid cooling device 3 and is configured to transport the cooling liquid in the liquid leakage collection device 4 to the water tank of the liquid cooling device 3. In this way, to avoid the cooling liquid in the liquid leakage collection device 4 from overflowing, the second water pump 7 can start to work when the liquid level of the cooling liquid in the liquid leakage collection device 4 reaches a preset height, and transport the cooling liquid to the water tank of the liquid cooling device 3, so that the leaked cooling liquid reenters the circulation of the energy storage battery system. Specifically, the second water pump 7 can be provided with a float switch, which has the characteristic that the float ball rises with the rising of the water level. The float switch can detect the change in the water level and control the start and stop of the second water pump 7 accordingly. With the rising of the liquid level of the cooling liquid in the liquid leakage collection device, the float ball also rises. When the water level reaches a preset high water level, the float ball triggers the switch and sends a signal to the motor control system of the second water pump 7, so that the motor of the second water pump 7 starts to work and transports the cooling liquid in the liquid leakage collection device to the water tank of the liquid cooling device 3. When the liquid level of the cooling liquid drops to a preset low water level, the float ball also drops and triggers the switch, so that the motor of the second water pump 7 is turned off and the transportation of the cooling liquid is stopped. In this way, the second water pump 7 can avoid running when there is no cooling liquid or the liquid level of the cooling liquid is low, so as to avoid damage or waste of electric energy and save energy.

[0060] In some embodiments, the energy storage battery system can also not need to be provided with a second water pump 7. Then along the direction of gravity, the leakage collection tank is arranged at a position higher than the water tank of the liquid cooling device 3, so that the cooling liquid in the leakage collection device 4 flows into the water tank of the liquid cooling device 3. Thus, the cooling liquid can flow naturally by gravity to the leakage collection device 4 without the need for additional power or pumping systems, without the need to set up a complex conveying structure, and the use cost is also reduced. And because the water tank of the liquid cooling device 3 is located below, the leaked cooling liquid can be quickly collected, reducing the risk of cooling liquid leaking to the external environment, and improving the safety performance of the energy storage battery system.

[0061] Referring to FIG. 7, in some embodiments, the liquid cooling pipe 11 connects the containing cavity 221, the leakage collection device 4, the liquid cooling device 3 and the inner cavity 211; since the magnetic attraction member 12 is installed on the liquid cooling pipe 11 to adsorb metal impurities in the cooling liquid. Thus, when the metal impurities flow through the area provided with the magnetic attraction member 12 along with the cooling liquid, the metal impurities will be adsorbed by the magnetic attraction member 12 to as far as possible avoid the metal impurities continue to flow with the cooling liquid, thereby effectively reducing the spread of metal impurities in the cooling liquid, and further protecting the energy storage battery system from the damage of metal impurities.

[0062] In this application, the battery modules are immersed in the cooling liquid, which can quickly absorb heat through immersion liquid cooling and take it to the outside circulation for cooling, ensuring that the battery operates within the optimal temperature range, effectively inhibiting battery thermal runaway, and improving the safety of the battery. But also because the cooling liquid will circulate in the battery pack 2, by adopting the liquid cooling pipe 11 assembly to realize the adsorption of metal impurities, so as to as far as possible reduce the flow of metal impurities into the battery pack 2 of the energy storage battery system, thereby as far as possible avoiding the metal impurities affecting the normal work of the energy storage battery system.

[0063] In some embodiments, the liquid cooling pipe 11 includes a first pipe section connecting the liquid cooling device 3 and the inner cavity 211, and the magnetic attraction member 12 is installed on the first pipe. It can be understood that, without considering the leakage of the cooling liquid, the cooling liquid circulates between the liquid cooling device 3 and the inner cavity 211 of the battery pack 2, and the cooling liquid flows from the liquid cooling device 3 to the inner cavity 211, and the cooling liquid exchanges heat with the battery modules in the inner cavity 211, and then flows from the inner cavity 211 to the liquid cooling device 3. Thus, along the flow direction of the cooling liquid, the magnetic attraction member 12 is installed on the first pipe, i.e. the magnetic attraction member 12 is located upstream of the battery pack 2. It can be understood that, when the cooling liquid passes through the magnetic attraction section, the metal impurities can be adsorbed and retained, so that the cooling liquid can as far as possible reduce the metal dust from entering the battery pack 2 again during the circulation of the cooling liquid.

[0064] In some examples, the magnetic attraction member 12 can be arranged outside the liquid cooling pipe 11, so that the magnetic attraction member 12 avoids interfering with the normal flow of the cooling liquid in the liquid cooling pipe 11. In other examples, the magnetic attraction member 12 can also be arranged inside the liquid cooling pipe 11. It can be understood that when the magnetic attraction member 12 is arranged inside the liquid cooling pipe 11, the pipe diameter of the liquid cooling pipe 11 corresponding to the position of the magnetic attraction member 12 needs to be set larger, so as to avoid the magnetic attraction member 12 affecting the flow of the cooling liquid as much as possible.

[0065] In summary, in the energy storage battery system of the present application, the second shell 22 of the battery pack 2 is sleeved on the first shell 21, when the first shell 21 leaks the cooling liquid, the containing cavity 221 of the second shell 22 can preliminarily store the leaked cooling liquid, thereby effectively avoiding the leaked cooling liquid flowing out of the energy storage battery system and polluting the surrounding environment. In addition, the arrangement of the liquid leakage collecting device 4 can also collect the cooling liquid in the containing cavity 221, thereby avoiding the cooling liquid in the containing cavity 221 being too much and causing leakage again. Moreover, the cooling liquid collected by the liquid leakage collecting device 4 can be transported to the liquid cooling device 3 again, so that the leaked cooling liquid reenters the circulation of the energy storage battery system, thereby reducing the waste of the cooling liquid.

Claims

1. A liquid cooling pipe assembly (1) applied to an energy storage battery system, comprising: a liquid cooling pipe (11) configured to transport a cooling liquid; and a magnetic attraction member (12) mounted on the liquid cooling pipe (11) to attract metal impurities in the cooling liquid. The magnetic attraction member (12) comprises a first magnetic attraction member (121) and a second magnetic attraction member (122). The first magnetic attraction member (121) and the second magnetic attraction member (122) are arranged on the outer wall of the liquid cooling pipe (11), and the first magnetic attraction member (121) and the second magnetic attraction member (122) are magnetically connected and jointly surround the liquid cooling pipe (11).

2. The liquid cooling tube assembly (1) according to claim 1, wherein The magnetic attraction member (12) has a cylindrical structure and is sleeved on the liquid cooling pipe (11). The magnetic attraction member (12) comprises a plurality of magnetic attraction portions (123) and a fixing member.

3. The liquid cooling tube assembly (1) according to claim 1 or 2, wherein The plurality of magnetic attraction portions (123) are arranged around the circumference of the outer wall of the liquid cooling pipe (11), and there is a gap between any two adjacent magnetic attraction portions (123).

4. The liquid-cooled tubing assembly (1) according to any one of claims 1 to 3, wherein, The liquid cooling pipe (11) comprises a magnetic attraction section and a conventional section, the magnetic attraction member (12) is arranged on the magnetic attraction section, and the magnetic attraction section and the conventional section are detachably connected. 7.An energy storage battery system, comprising: the liquid cooling pipe assembly (1) according to any one of claims 1 to 6; a battery pack (2) comprising a first housing (21) and a battery module, the first housing (21) being provided with an inner cavity (211), and the battery module being arranged in the inner cavity (211), the inner cavity (211) being further configured to accommodate a cooling liquid for soaking the battery module; and a liquid cooling device (3) connected to the inner cavity (211) through the liquid cooling pipe (11) to transport the cooling liquid between the inner cavity (211) and the liquid cooling device (3).

5. The liquid-cooled tubing assembly (1) according to any one of claims 1 to 4, wherein, The liquid cooling device (3) further comprises: a flow rate sensor (32) arranged in the liquid cooling pipe (11) to detect the flow rate of the cooling liquid.

6. The liquid-cooled tubing assembly (1) according to any one of claims 1 to 5, wherein, The liquid cooling pipe (11) comprises a magnetic attraction section corresponding to the magnetic attraction member (12), and the flow rate sensor (32) is arranged in the magnetic attraction section; or The liquid cooling pipe (11) comprises a magnetic attraction section corresponding to the magnetic attraction member (12), and the flow rate sensor (32) is arranged downstream of the magnetic attraction section in the flow direction of the cooling liquid. The liquid cooling device (3) further comprises: a resistance sensor (33) and / or a conductivity sensor arranged in the liquid cooling pipe (11) to detect the concentration of metal impurities in the cooling liquid. ​ ​ 8. The energy storage battery system of claim 7, wherein, ​ ​ 9. The energy storage battery system of claim 8, wherein, ​ ​ 10. The energy storage battery system of any one of claims 7-9, wherein, ​ ​ 11. The energy storage battery system of any one of claims 7 to 10, wherein, The battery pack (2) further comprises a second shell (22) provided with a receiving cavity (221), and the first shell (21) is arranged in the receiving cavity (221), and the receiving cavity (221) is arranged to collect the leaked cooling liquid from the inner cavity (211).

12. The energy storage battery system of claim 11, wherein, The energy storage battery system further comprises a liquid leakage collecting device (4) connected to the receiving cavity (221) and the liquid cooling device (3) respectively, and the liquid leakage collecting device (4) can collect the cooling liquid in the receiving cavity (221) and deliver the cooling liquid to the liquid cooling device (3).

13. The energy storage battery system according to claim 12, comprising a plurality of battery packs (2), and the receiving cavities (221) of the plurality of battery packs (2) are connected to the same liquid leakage collecting device (4).

14. The energy storage battery system of claim 12 or 13, wherein, In the direction of gravity, the liquid leakage collecting device (4) is located below the receiving cavity (221) so that the cooling liquid in the receiving cavity (221) flows into the liquid leakage collecting device (4).

15. The energy storage battery system according to claim 12, further comprising a first water pump connected to the receiving cavity (221) and the liquid leakage collecting device (4), and the first water pump is arranged to deliver the cooling liquid in the receiving cavity (221) to the liquid leakage collecting device (4).

16. The energy storage battery system according to any one of claims 11 to 15, further comprising an electromagnetic valve (5) and a liquid level detecting device (6), the electromagnetic valve (5) is connected to a liquid outlet (222) of the receiving cavity (221), and the electromagnetic valve (5) is arranged to open or close the liquid outlet (222); the liquid level detecting device (6) is arranged in the receiving cavity (221), the liquid level detecting device (6) is connected to the electromagnetic valve (5), and the liquid level detecting device (6) is arranged to trigger the electromagnetic valve (5) to open or close the liquid outlet (222) when the cooling liquid reaches a preset height.

17. The energy storage battery system of claim 16, wherein, The liquid level detecting device (6) comprises a first liquid level sensor (61) and a second liquid level sensor (62), and in the direction of gravity, the second liquid level sensor (62) is located below the first liquid level sensor (61); the first liquid level sensor (61) is arranged to trigger the electromagnetic valve (5) to open the liquid outlet (222) when the liquid level of the cooling liquid reaches a first position; the second liquid level sensor (62) is arranged to trigger the electromagnetic valve (5) to close the liquid outlet (222) when the liquid level of the cooling liquid reaches a second position.

18. The energy storage battery system of claim 16 or 17, wherein, The liquid level detecting device (6) comprises a third liquid level sensor; the third liquid level sensor triggers the electromagnetic valve (5) to open the liquid outlet (222) when the cooling liquid is at a first preset position; the third liquid level sensor triggers the electromagnetic valve (5) to close the liquid outlet (222) when the cooling liquid is at a second preset position; the second preset position is located below the first preset position.

19. The energy storage battery system according to any one of claims 12 to 18, further comprising a second water pump (7) connecting the liquid leakage collecting device (4) and the liquid cooling device (3), the second water pump (7) being configured to deliver the cooling liquid of the liquid leakage collecting device to the liquid cooling device (3).

20. The energy storage battery system of any one of claims 12 to 19, wherein, The liquid cooling pipe (11) connects the containing cavity (221), the liquid leakage collecting device (4), the liquid cooling device (3) and the inner cavity (211).

21. The energy storage battery system of claim 20, wherein, The liquid cooling pipe (11) comprises a first pipe segment connecting the liquid cooling device (3) and the inner cavity (211), and the magnetic attraction member (12) is mounted on the first pipe segment.

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