Battery pack and leakage protection method

Abstract

The application relates to a battery pack and a liquid leakage protection method. The battery pack comprises a battery module, a liquid cooling assembly, a liquid inlet pipe, a pressure sensor and a first control valve. The battery module is arranged on a liquid cooling plate, the liquid inlet pipe is communicated with a liquid inlet of the liquid cooling plate, the pressure sensor and the first control valve are both mounted on the liquid inlet pipe, the pressure sensor is used for detecting the pressure in the liquid inlet pipe, and the first control valve is used for controlling the conduction or cut-off of the liquid inlet pipe. The liquid collecting piece has a flow collecting groove arranged around the circumferential edge of the liquid cooling plate, and the flow collecting groove is used for collecting liquid leakage. An insulation resistance sensor is arranged in the flow collecting groove and is used for detecting the resistance at the position. A battery management system is electrically connected with the pressure sensor, the first control valve and the insulation resistance sensor. The battery management system is used for controlling the cut-off of the liquid inlet pipe through the first control valve according to the detection results of the insulation resistance sensor and the pressure sensor.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery pack and a method for preventing leakage. Background Technology

[0002] As a key component of new energy vehicles, the performance of power batteries directly affects the overall performance of these vehicles. Safety, consistency, high and low temperature performance, lifespan, and cost are the main indicators characterizing battery performance. To ensure these performance characteristics, power batteries require liquid cooling for temperature control. Currently, the coolant used in liquid cooling systems is ethylene glycol + water, which is conductive. Therefore, leakage in the liquid cooling system can easily cause a short circuit and lead to thermal runaway. Existing technology immediately shuts down the liquid cooling system upon detecting leakage within the battery pack.

[0003] However, leakage from the liquid cooling system is not the only source of liquid in the battery pack. It could also be condensation or liquid entering from the outside. Blindly shutting off the liquid cooling system can also cause a sharp drop in the battery pack's heat dissipation performance and may lead to thermal runaway. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery pack and leakage protection method that improves upon the above-mentioned defects, in order to address the problem that blindly disconnecting the liquid cooling system in the existing technology can lead to a sharp decline in the heat dissipation performance of the battery pack and also pose a risk of thermal runaway.

[0005] A battery pack, comprising:

[0006] Battery module;

[0007] The liquid cooling assembly includes a liquid cooling plate, an inlet pipe, a pressure sensor, and a first control valve; the battery module is mounted on the liquid cooling plate, the inlet pipe is connected to the inlet of the liquid cooling plate, the pressure sensor and the first control valve are both mounted on the inlet pipe, the pressure sensor is used to detect the pressure in the inlet pipe, and the first control valve is used to control the inlet pipe to open or close.

[0008] The liquid collection device has a collection groove arranged around the periphery of the liquid cooling plate, the collection groove being used to collect leaked liquid;

[0009] An insulation resistance sensor is installed inside the current collector to detect the resistance at its location.

[0010] The battery management system is electrically connected to the pressure sensor, the first control valve, and the insulation resistance sensor; the battery management system is used to control the liquid inlet pipe to be shut off through the first control valve based on the detection results of the insulation resistance sensor and the pressure sensor.

[0011] In one embodiment, the liquid cooling plate has a cooling area on one side of the surface facing the battery module and a peripheral area surrounding the cooling area; the battery module is disposed in the cooling area, the liquid collecting device is disposed in the peripheral area, and the liquid collecting groove is opened on the side of the liquid collecting device away from the liquid cooling plate.

[0012] In one embodiment, the liquid collecting component further has a first flow guiding slope located outside the collecting groove. The first flow guiding slope is arranged around the collecting groove. The height of the inner side of the first flow guiding slope relative to the liquid cooling plate is a first inner height, and the height of the outer side of the first flow guiding slope relative to the liquid cooling plate is a first outer height. The first outer height is greater than the first inner height.

[0013] The liquid collecting component also has a second flow guiding slope located between the collecting groove and the battery module. The second flow guiding slope is arranged around the battery module. The height of the inner side of the second flow guiding slope relative to the liquid cooling plate is the second inner height, and the height of the outer side of the second flow guiding slope relative to the liquid cooling plate is the second outer height. The second inner height is greater than the second outer height.

[0014] In one embodiment, the liquid collecting component further has a first drainage groove and a first clearance hole. The first drainage groove is formed on the second drainage slope and communicates with the liquid collecting groove. The first clearance hole is located in the first drainage groove and extends through the first drainage groove to the side of the liquid collecting component facing the liquid cooling plate.

[0015] One end of the liquid inlet pipe passes through the first clearance hole and is connected to the liquid inlet of the liquid cooling plate. The insulation resistance sensor is installed in the first drainage groove.

[0016] In one embodiment, the battery pack further includes a first drain valve, a first liquid level sensor, a second drain valve, and a second liquid level sensor, all electrically connected to the battery management system.

[0017] The liquid collecting device has a first end and a second end at its two ends in a preset direction. The first drain valve is connected to the portion of the collecting trough located at the first end, and the second drain valve is connected to the portion of the collecting trough located at the second end. The first liquid level sensor is installed in the collecting trough and located at the first end, and the second liquid level sensor is installed in the collecting trough and located at the second end.

[0018] The battery management system is used to control the opening or closing of the first drain valve based on the detection result of the first liquid level sensor, and is also used to control the opening or closing of the second drain valve based on the detection result of the second liquid level sensor.

[0019] In one embodiment, a leakage protection method for a battery pack as described in any of the above embodiments includes the following steps:

[0020] The insulation resistance sensor monitors the resistance at its location in real time, and the pressure sensor monitors the pressure inside the inlet pipe in real time.

[0021] If the resistance value detected by the insulation resistance sensor is less than the preset resistance value, and the pressure detected by the pressure sensor is less than the preset pressure, the battery management system controls the liquid inlet pipe to be shut off through the first control valve.

[0022] In one embodiment, the first liquid level sensor and the second liquid level sensor respectively monitor the liquid level height at their respective locations in real time;

[0023] After the step of the first control valve controlling the shut-off of the inlet pipe, the method further includes:

[0024] If at least one of the first liquid level sensor and the second liquid level sensor detects a liquid level height greater than a first preset liquid level height, the battery management system controls the relay to disconnect.

[0025] In one embodiment, the battery management system further includes the following step after controlling the relay to disconnect:

[0026] The battery management system controls the opening of the first drain valve and / or the second drain valve;

[0027] If the liquid level height detected by the first liquid level sensor and the second liquid level sensor is both less than the first preset liquid level height, the battery management system controls the relay to close.

[0028] If the liquid level detected by the first liquid level sensor is less than the second preset liquid level, the battery management system controls the first drain valve to close; wherein the second preset liquid level is less than the first preset liquid level.

[0029] If the liquid level detected by the second liquid level sensor is less than the second preset liquid level, the battery management system controls the second drain valve to shut off.

[0030] In one embodiment, the step of the battery management system controlling the relay to disconnect includes:

[0031] If the liquid level detected by the first liquid level sensor is greater than or equal to the first preset liquid level, and the liquid level detected by the second liquid level sensor is less than the first preset liquid level, the battery management system controls the first drain valve to open.

[0032] If the liquid level detected by the second liquid level sensor is greater than or equal to the second preset liquid level, the battery management system controls the second drain valve to open; wherein the second preset liquid level is less than the first preset liquid level.

[0033] If the liquid level height detected by the first liquid level sensor and the second liquid level sensor is both less than the first preset liquid level height, the battery management system controls the relay to close.

[0034] If the liquid level detected by the first liquid level sensor is less than the second preset liquid level, the battery management system controls the first drain valve to shut off.

[0035] If the liquid level detected by the second liquid level sensor is less than the second preset liquid level, the battery management system controls the second drain valve to shut off.

[0036] In one embodiment, the step of the battery management system controlling the relay to disconnect includes:

[0037] If the liquid level detected by the second liquid level sensor is greater than or equal to the first preset liquid level, and the liquid level detected by the first liquid level sensor is less than the first preset liquid level, the battery management system controls the second drain valve to open.

[0038] If the liquid level detected by the first liquid level sensor is greater than or equal to the second preset liquid level, the battery management system controls the first drain valve to open; wherein the second preset liquid level is less than the first preset liquid level.

[0039] The aforementioned battery pack and leakage protection method utilizes the detection results of an insulation resistance sensor to determine whether leakage exists. If leakage is detected, the detection results of a pressure sensor are used to determine whether the leakage is coolant. Only when the leakage in the collector is determined to be coolant does the battery management system control the inlet pipe to shut off via the first control valve. This avoids blindly closing the inlet pipe, which would stop cooling the battery module and reduce the risk of thermal runaway of the battery module. Attached Figure Description

[0040] Figure 1 This is an exploded view of a battery pack according to an embodiment of the present invention;

[0041] Figure 2 for Figure 1 The battery pack shown is a top view (with the cover plate omitted);

[0042] Figure 3 for Figure 1 The diagram shows the assembly structure of the liquid collection device and various sensors and other components of the battery pack.

[0043] Figure 4 for Figure 3 A top view of the liquid collection device shown;

[0044] Figure 5 This is a flowchart illustrating the steps of the leakage protection method in the first embodiment of the present invention;

[0045] Figure 6 for Figure 5 The flowchart of the leakage protection method is shown below;

[0046] Figure 7 This is a flowchart illustrating the steps of the leakage protection method in the second embodiment of the present invention;

[0047] Figure 8 This is a flowchart illustrating the steps of the leakage protection method in the third embodiment of the present invention;

[0048] Figure 9 for Figure 7 In the second embodiment shown, and Figure 8 A flowchart of the leakage protection method in the third embodiment described above;

[0049] Figure 10 This is a flowchart illustrating the steps of the leakage protection method in the fourth embodiment of the present invention. Detailed Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0056] Please see Figures 1 to 4 As shown, one embodiment of the present invention provides a battery pack, including a housing 81 and battery modules 10, a liquid cooling assembly (not shown), a liquid collector 30, an insulation resistance sensor 40, and a battery management system 50, all disposed within the housing 81. The liquid cooling assembly includes a liquid cooling plate 21, an inlet pipe 22, a pressure sensor 23, a first control valve 24, and an outlet pipe 25. The battery modules 10 are disposed on the liquid cooling plate 21. Optionally, thermally conductive adhesive is filled between the liquid cooling plate 21 and the battery modules 10 to achieve a fixed connection and heat conduction between the liquid cooling plate 21 and the battery modules 10, thereby improving the cooling effect of the liquid cooling plate 21 on the battery modules 10. One end of the inlet pipe 22 is connected to the liquid inlet 211 of the liquid cooling plate 21, and the other end of the inlet pipe 22 extends outside the housing 81 and is connected to an external pipeline. One end of the outlet pipe 25 is connected to the outlet port 213 of the liquid cooling plate 21, and the other end of the outlet pipe 25 extends out of the housing 81 and is connected to an external pipeline. Coolant enters the liquid cooling plate 21 through the inlet pipe 22 and cools the battery module 10 within the liquid cooling plate 21. The coolant in the liquid cooling plate 21 is then discharged through the outlet pipe 25, thereby carrying away the heat from the battery module 10 to prevent it from overheating. The pressure sensor 23 and the first control valve 24 are both installed on the inlet pipe 22. The pressure sensor 23 is used to detect the pressure inside the inlet pipe 22, and the first control valve 24 is used to control the opening or closing of the inlet pipe 22. When the first control valve 24 controls the inlet pipe 22 to be open, coolant can enter the liquid cooling plate 21 through the inlet pipe 22; when the first control valve 24 controls the inlet pipe 22 to be closed, coolant stops entering the liquid cooling plate 21 through the inlet pipe 22.

[0057] refer to Figure 2 , Figure 3 and Figure 4As shown, the liquid collecting unit 30 has a collection channel 31 arranged around the periphery of the liquid cooling plate 21, surrounding the battery module 10. This collection channel 31 is used to collect leaked liquid. An insulation resistance sensor 40 is disposed in the collection channel 31 of the liquid collecting unit 30 to detect the resistance at its location. When leakage occurs in the battery pack, the leakage is collected in the collection channel 31. Since the leakage is conductive, the insulation resistance sensor 40 can determine the presence of leakage when it detects a decrease in the resistance value in the collection channel 31 (for example, when the insulation resistance sensor 40 detects that the resistance value in the collection channel 31 is lower than a preset resistance value). The battery management system 50 is electrically connected to the pressure sensor 23, the first control valve 24, and the insulation resistance sensor 40 via a wiring harness. The battery management system 50 is used to control the liquid inlet pipe 22 to be shut off via the first control valve 24 based on the detection results of the insulation resistance sensor 40 and the pressure sensor 23.

[0058] In actual use, the first control valve 24 keeps the inlet pipe 22 open, allowing coolant to enter the liquid cooling plate 21 through the inlet pipe 22 and then exit through the outlet pipe 25. The coolant flowing through the liquid cooling plate 21 carries away the heat from the battery module 10, thus cooling the battery module 10. Simultaneously, the insulation resistance sensor 40 monitors the resistance in the collector 31 in real time, and the pressure sensor 23 monitors the pressure in the inlet pipe 22 in real time.

[0059] If the insulation resistance sensor 40 detects that the resistance value in the collector tank 31 is less than a preset resistance value, and the pressure sensor 23 detects that the pressure value in the inlet pipe 22 is greater than or equal to a preset pressure value, it indicates that there is leakage in the collector tank 31, but the leakage is not coolant. At this time, it is necessary to keep the coolant continuously entering the liquid cooling plate 21, that is, to keep cooling the battery module 10 to avoid the battery module 10 overheating and thermal runaway.

[0060] If the insulation resistance sensor 40 detects that the resistance value in the collector 31 is less than the preset resistance value, and the pressure sensor 23 detects that the pressure value in the inlet pipe 22 is less than the preset pressure value, it indicates that there is leakage in the collector 31, and the leakage is coolant. At this time, the battery management system 50 controls the inlet pipe 22 to be shut off through the first control valve 24, preventing coolant from continuing to enter the liquid cooling plate 21 through the inlet pipe 22 and causing the leakage in the battery pack to continue to increase, thereby avoiding a short circuit.

[0061] Thus, the battery management system 50 in the battery pack of this application determines whether there is leakage by the detection result of the insulation resistance sensor 40. If there is leakage, it uses the detection result of the pressure sensor 23 to determine whether the leakage is leaking coolant. Only when it is determined that the leakage in the collector 31 is leaking coolant will the battery management system 50 control the inlet pipe 22 to be shut off through the first control valve 24. This avoids blindly closing the inlet pipe 22 and stopping the cooling of the battery module 10, thereby improving the cooling effect and reducing the risk of thermal runaway of the battery module 10.

[0062] It should be noted that the liquid collecting component 30 can be made of low-density closed-cell foam material, which is non-absorbent, lightweight, and has a low thermal conductivity, thus providing a certain degree of insulation for the surface of the liquid cooling plate 21. In low-temperature environments, the liquid collecting component 30 can provide insulation for the liquid cooling plate 21, reducing heat loss; in high-temperature environments, the liquid collecting component 30 can reduce the risk of condensation on the surface of the liquid cooling plate 21.

[0063] Specifically, in this embodiment, the housing 81 has an opening 810, and the battery pack further includes a cover plate 82 covering the opening 810 of the housing 81, thereby encapsulating the battery module 10, liquid cooling assembly, liquid collector 30, insulation resistance sensor 40, and battery management system 50 within the housing 81 using the cover plate 82. Furthermore, the battery pack also includes a sealing ring 83 disposed between the housing 81 and the cover plate 82, which seals the gap between the housing 81 and the cover plate 82 to ensure that the sealing performance of the battery pack meets the requirements.

[0064] In a specific embodiment, the liquid cooling assembly further includes a second control valve 26, which is installed on the outlet pipe 25 and used to control the opening or closing of the outlet pipe 25. The second control valve 26 is electrically connected to the battery management system 50 via a wiring harness. When the insulation resistance sensor 40 detects that the resistance value in the collector 31 is less than a preset resistance value, and the pressure sensor 23 detects that the pressure value in the inlet pipe 22 is less than a preset pressure value, the battery management system 50 controls the inlet pipe 22 to close via the first control valve 24. The battery management system 50 also controls the outlet pipe 25 to close via the second control valve 26. This prevents coolant from entering the liquid cooling plate 21 through the inlet pipe 22, thus avoiding further leakage in the collector 31; and also prevents coolant from being drawn back into the liquid cooling plate 21 through the outlet pipe 25, thus avoiding further leakage in the collector 31.

[0065] In embodiments of this application, the battery pack further includes a first drain valve 70, a first liquid level sensor 60, a second drain valve 71, and a second liquid level sensor 61, all electrically connected to the battery management system 50 via wiring harnesses. The liquid collecting member 30 has a first end a1 and a second end a2 at its two ends in a predetermined direction X. The first drain valve 70 communicates with the portion of the collecting trough 31 located at the first end a1, and the second drain valve 71 communicates with the portion of the collecting trough 31 located at the second end a2. The first liquid level sensor 60 is installed in the collecting trough 31 and is located at the first end a1 of the liquid collecting member 30. The second liquid level sensor 61 is installed in the collecting trough 31 and is located at the second end a2 of the liquid collecting member 30.

[0066] The battery management system 50 controls the opening or closing of the first drain valve 70 based on the detection result of the first liquid level sensor 60. The battery management system 50 also controls the opening or closing of the second drain valve 71 based on the detection result of the second liquid level sensor 61. When the first drain valve 70 is open, it drains the leaking liquid in the collector 31 to the outside of the battery pack housing 81; when the first drain valve 70 is closed, it stops draining the leaking liquid from the collector 31. Similarly, when the second drain valve 71 is open, it drains the leaking liquid in the collector 31 to the outside of the battery pack housing 81; when the second drain valve 71 is closed, it stops draining the leaking liquid from the collector 31.

[0067] It should be noted that when the battery pack is used in a vehicle, the first end a1 of the liquid collector 30 is closer to the front of the vehicle, and the second end a2 of the liquid collector 30 is closer to the rear of the vehicle (or the second end a2 of the liquid collector 30 is closer to the front of the vehicle, and the first end a1 of the liquid collector 30 is closer to the rear of the vehicle). If leakage occurs when the vehicle is going uphill, downhill, accelerating, decelerating, or braking, the liquid level at the first end a1 in the collection channel 31 will be different from the liquid level at the second end a2. If the first drain valve 70 and the second drain valve 71 are opened blindly to drain the liquid, it may not achieve the effect of rapid drainage. Instead, it may cause the liquid to accumulate in the box, increasing the safety risk, and may even increase the risk of external substances entering the battery pack box 81.

[0068] Thus, in actual use, the first drain valve 70 and the second drain valve 71 are normally closed. The first liquid level sensor 60 and the second liquid level sensor 61 monitor the liquid level at their respective locations in real time. If the liquid level detected by the first liquid level sensor 60 is greater than or equal to the first preset liquid level, and the liquid level detected by the second liquid level sensor 61 is less than the first preset liquid level, it indicates that the liquid level at the first end a1 of the collecting tank 31 has reached or exceeded the first preset liquid level. The battery management system 50 then controls the first drain valve 70 to open, allowing the first drain valve 70 to drain the leaking liquid from the collecting tank 31 through the first end a1. During the draining process of the first drain valve 70, if the liquid level detected by the second liquid level sensor 61 is greater than or equal to the second preset liquid level (which is less than the first preset liquid level), the battery management system 50 controls the second drain valve 71 to open, allowing the second drain valve 71 to perform auxiliary draining at the second end a2. During the process of draining liquid through the first drain valve 70 and assisting in draining liquid through the second drain valve 71, if the liquid level detected by the second drain valve 71 is lower than the second preset liquid level, the battery management system 50 controls the second drain valve 71 to shut off and stop draining liquid; if the liquid level detected by the first drain valve 70 is lower than the second preset liquid level, the battery management system 50 controls the first drain valve 70 to shut off and stop draining liquid.

[0069] If the liquid level detected by the second liquid level sensor 61 is greater than or equal to the first preset liquid level, and the liquid level detected by the first liquid level sensor 60 is less than the first preset liquid level, it indicates that the liquid level at the second end a2 of the collecting tank 31 has reached or exceeded the first preset liquid level. The battery management system 50 then controls the second drain valve 71 to open, allowing the second drain valve 71 to drain the leaking liquid from the collecting tank 31 at the second end a2. During the draining process of the second drain valve 71, if the liquid level detected by the first liquid level sensor 60 is greater than or equal to the second preset liquid level (which is less than the first preset liquid level), the battery management system 50 controls the first drain valve 70 to open, allowing the first drain valve 70 to perform auxiliary draining at the first end a1. During the process of draining liquid through the second drain valve 71 and assisting in draining liquid through the first drain valve 70, if the liquid level detected by the first drain valve 70 is lower than the second preset liquid level, the battery management system 50 controls the first drain valve 70 to shut off and stop draining liquid; if the liquid level detected by the second drain valve 71 is lower than the second preset liquid level, the battery management system 50 controls the second drain valve 71 to shut off and stop draining liquid.

[0070] If the liquid level detected by the first liquid level sensor 60 is greater than or equal to the first preset liquid level, and the liquid level detected by the second liquid level sensor 61 is also greater than or equal to the first preset liquid level, it indicates that the liquid levels at both the first end a1 and the second end a2 of the collecting tank 31 are greater than or equal to the first preset liquid level. The battery management system 50 then controls the first drain valve 70 and the second drain valve 71 to open, allowing the first drain valve 70 to drain the leaking liquid from the collecting tank 31 at the first end a1, and the second drain valve 71 to drain the leaking liquid from the collecting tank 31 at the second end a2. During the draining process of the first drain valve 70 and the second drain valve 71, if the liquid level detected by the first liquid level sensor 60 is less than the second preset liquid level, the battery management system 50 controls the first drain valve 70 to close and stop draining; if the liquid level detected by the second liquid level sensor 61 is less than the second preset liquid level, the battery management system 50 controls the second drain valve 71 to close and stop draining. By setting the second preset liquid level height, the drain valve can be closed as early as possible, reducing the risk of external substances entering the battery pack housing 81.

[0071] In a specific embodiment, the battery pack also includes an electrical connector 12 and a relay 14. The electrical connector 12 is electrically connected to the battery module 10 via the relay 14, thereby allowing the battery module 10 to output electrical energy to the outside (i.e., discharge) or input external electrical energy to the battery module 10 (i.e., charge) via the electrical connector 12. The relay 14 is electrically connected to the battery management system 50, which controls the relay 14 to close or open based on the detection results of the first liquid level sensor 60 and the second liquid level sensor 61.

[0072] Thus, in actual use, relay 14 is in the closed state, and the first liquid level sensor 60 and the second liquid level sensor 61 monitor the liquid level at their respective locations in real time. If the liquid level detected by the first liquid level sensor 60 and / or the second liquid level sensor 61 is greater than or equal to a first preset liquid level, the battery management system 50 controls relay 14 to open, thereby cutting off the electrical connection between the battery module 10 and the outside world and stopping the power supply to the outside. If the liquid level detected by both the first liquid level sensor 60 and the second liquid level sensor 61 is less than the first preset liquid level, the battery management system 50 controls relay 14 to close, thereby restoring the electrical connection between the battery module 10 and the outside world and continuing to supply power to the outside world.

[0073] In the embodiments of this application, the surface of the liquid cooling plate 21 facing the battery module 10 has a cooling area and a peripheral area surrounding the cooling area. The cooling area is provided with cooling channels, while the peripheral area may not have cooling channels. The battery module 10 is disposed in the cooling area of ​​the liquid cooling plate 21, and the liquid collector 30 is disposed in the peripheral area of ​​the liquid cooling plate 21 to concentrate the cooling capacity and ensure the overall cooling effect. The collection groove 31 is opened on the side of the liquid collector 30 away from the liquid cooling plate 21. Thus, the coolant leaking from the liquid cooling plate 21 is collected in the collection groove 31. When the liquid level in the collection groove 31 is greater than or equal to a first preset liquid level, the risk of the battery module 10 or other conductive components coming into contact with the leaking liquid is relatively high. At this time, it is necessary to drain the leaking liquid in the collection groove 31 to the outside of the battery pack housing 81.

[0074] Furthermore, the liquid collecting component 30 also has a first guiding slope 32 located outside the collecting groove 31, which surrounds the collecting groove 31. The height of the inner side of the first guiding slope 32 relative to the liquid cooling plate 21 is the first inner height, and the height of the outer side of the first guiding slope 32 relative to the liquid cooling plate 21 is the first outer height. The first outer height is greater than the first inner height, making the first guiding slope 32 a slope with a higher outer side and a lower inner side, ensuring that leaked liquid can flow smoothly along the first guiding slope 32 into the collecting groove 31. The liquid collecting component 30 is disposed inside the housing 81 and connected to the side wall of the housing 81, thereby facilitating the guidance of condensation on the side wall of the housing 81 from the first guiding slope 32 into the collecting groove 31, improving the timeliness and accuracy of liquid detection.

[0075] Furthermore, the liquid collecting component 30 also has a second guiding slope 33 located between the collecting groove 31 and the battery module 10. This second guiding slope 33 is arranged around the battery module 10. The height of the inner side (the side closer to the battery module 10) of the second guiding slope 33 relative to the liquid cooling plate 21 is the second inner height, and the height of the outer side of the second guiding slope 33 relative to the liquid cooling plate 21 is the second outer height. This second inner height is greater than the second outer height, making the second guiding slope 33 a slope with a higher inner side and a lower outer side, ensuring that leaked liquid can flow smoothly along the second guiding slope 33 into the collecting groove 31. The relatively arranged first guiding slope 32 and second guiding slope 33 facilitate the collection of leaked liquid and / or condensation into the collecting groove 31, making it easier to detect the liquid level, improving detection timeliness, and ensuring overall safety.

[0076] In a specific embodiment, the liquid collecting component 30 also has a first drainage groove 34 and a first clearance hole 36. The first drainage groove 34 is formed on the second drainage slope 33 and communicates with the collecting groove 31. The first clearance hole 36 is located in the first drainage groove 34 and extends through the first drainage groove 34 to the side of the liquid collecting component 30 facing the liquid cooling plate 21. One end of the liquid inlet pipe 22 passes through the first clearance hole 36 and communicates with the liquid inlet 211 of the liquid cooling plate 21. Thus, since there is a high risk of leakage at the connection between the liquid inlet pipe 22 and the liquid inlet 211 of the liquid cooling plate 21, by providing the first clearance hole 36 and the first drainage groove 34, the leaked liquid at the connection between the liquid inlet pipe 22 and the liquid inlet 211 of the liquid cooling plate 21 can be quickly collected into the collecting groove 31.

[0077] Furthermore, the insulation resistance sensor 40 is installed within the first drainage channel 34, enabling the insulation resistance sensor 40 to detect leakage more quickly, thereby improving the timeliness and accuracy of leakage detection. Specifically, a first mounting slot 38 is formed within the first drainage channel 34, and the insulation resistance sensor 40 is installed within this first mounting slot 38.

[0078] Specifically, in this embodiment, the liquid collecting component 30 also has a second drainage groove 35 and a second clearance hole 37. The second drainage groove 35 is formed on the second drainage inclined surface 33 and communicates with the collecting groove 31. The second clearance hole 37 is located inside the second drainage groove 35 and extends through the second drainage groove 35 to the side of the collecting component 30 facing the liquid cooling plate 21. One end of the liquid outlet pipe 25 passes through the second clearance hole 37 and communicates with the liquid outlet 213 of the liquid cooling plate 21. Thus, since there is a high risk of leakage at the connection between the liquid outlet pipe 25 and the liquid outlet 213 of the liquid cooling plate 21, by providing the second clearance hole 37 and the second drainage groove 35, the leaked liquid at the connection between the liquid outlet pipe 25 and the liquid outlet 213 of the liquid cooling plate 21 can be quickly collected into the collecting groove 31.

[0079] Furthermore, the insulation resistance sensor 40 is installed within the second drainage channel 35, enabling the insulation resistance sensor 40 to detect leakage more quickly, thus improving the timeliness and accuracy of leakage detection. Specifically, a first mounting groove 38 is provided within the second drainage channel 35, and the insulation resistance sensor 40 is installed within this first mounting groove 38 to accommodate the insulation resistance sensor 40. This not only serves as a limiting function but also isolates the insulation resistance sensor 40 from the liquid cooling plate 21.

[0080] It should be noted that, in addition to setting insulation resistance sensors 40 in the first drainage channel 34 and the second drainage channel 35, one or more first mounting slots 38 can be opened at other positions of the collection channel 31. Each first mounting slot 38 is equipped with an insulation resistance sensor 40. By using each insulation resistance sensor 40 to monitor the resistance at each position of the collection channel 31 in real time, it is beneficial to improve the accuracy and timeliness of leak detection.

[0081] In a specific embodiment, the collection trough 31 is further provided with a second mounting groove 39 and a third mounting groove 391. The second mounting groove 39 is located at the first end a1 of the liquid collecting component 30, and the third mounting groove 391 is located at the second end a2 of the liquid collecting component 30. The first liquid level sensor 60 is installed in the second mounting groove 39, and the second liquid level sensor 61 is installed in the third mounting groove 391. This not only serves as a limiting function but also isolates the liquid level sensors from the liquid cooling plate 21.

[0082] Optionally, the number of second mounting slots 39 can be two or more, and each second mounting slot 39 is equipped with a first liquid level sensor 60. The number of third mounting slots 391 can be two or more, and each third mounting slot 391 is equipped with a second liquid level sensor 61. Specifically... Figure 4In the illustrated embodiment, there are two second mounting slots 39, located at both ends of one side of the liquid collecting member 30 along the preset direction X. There are also two third mounting slots 391, located at both ends of the other side of the liquid collecting member 30 along the preset direction X. That is, two first liquid level sensors 60 are positioned at both ends of one side along the preset direction X, i.e., at both ends of the side of the first end (a1). Two second liquid level sensors 61 are positioned at both ends of the other side along the preset direction X, i.e., at both ends of the side of the second end (a2). The first and second liquid level sensors 60 are arranged opposite each other along the preset direction X, and liquid level sensors are installed at all four positions of the liquid collecting member 60, thereby expanding the detection range and improving detection accuracy. The collecting trough 31 is arranged around the liquid collecting component 30 and is closed and connected. Multiple liquid level sensors are respectively set at the four corners of the collecting trough 31. No matter how the liquid collecting component 60 is tilted or flipped, it can be ensured that the liquid can flow along the collecting trough 31 to different corner positions, so that it can be detected by the liquid level sensor at that corner position, thereby avoiding missed detection and improving overall safety. It is especially suitable for use during driving, such as uphill, downhill, acceleration, deceleration or turning, and can accurately detect liquid for precise drainage. It can be understood that the first drainage valve (70) is set at the first end (a1). When the liquid flows to the first end (a1), precise drainage is achieved by controlling the first drainage valve (70); the second drainage valve (71) is set at the second end (a2). When the liquid flows to the second end (a2), precise drainage is achieved by controlling the second drainage valve (71). To improve accuracy, drain valves can be installed at all four corners of the collection tank 31. When an abnormality is detected in the liquid level sensor 60 at any corner, the corresponding drain valve at that corner can be controlled to drain the liquid, while the drain valves at the other corners are closed, thus ensuring accurate draining. By placing the first drain valve 70 and the second drain valve 71 at the first and second ends, the inertia of the liquid during operation can be utilized to improve draining efficiency and accelerate liquid discharge.

[0083] In one optional embodiment, a first drain valve 70 and a second drain valve 71 are respectively disposed at the first end a1 and the second end a2 of the collecting tank 31. The first drain valve 70 and the second drain valve 71 can be disposed at any position on the side of the first end a1 and the side of the second end a2, respectively. This ensures accurate drainage even when the liquid flows to any corner of the collecting tank 31, reduces the number of drain valves, saves costs, and simplifies the overall structure and control strategy. When any first liquid level sensor 60 located at the first end a1 detects that the liquid level has reached a first preset height, the first drain valve 70 can be controlled to open for drainage. Even if the liquid level detected by the first liquid level sensor 60 near the first drain valve 70 has not reached the first preset height, but there is a large amount of liquid at another corner of the first end a1, drainage can still be achieved through the first drain valve 70. Optionally, when any liquid level sensor far from the drain valve detects that the liquid level has reached the first preset height, the nearest drain valve can be controlled to open for drainage, thereby improving drainage efficiency.

[0084] In another alternative embodiment, reference Figure 3 As shown, a first drain valve 70 and a second drain valve 71 are disposed at the first end a1 and the second end a2 of the collecting trough 31, and at diagonal positions of the collecting component 30. Liquid level sensors are disposed at the four corner positions of the collecting component 30. Drain valves and liquid level sensors located at the same corner position are relatively close to each other to facilitate rapid drainage. This design also shortens the drainage path and prevents liquid from accumulating at the corner positions most of the time when the drain valve is located in the center of the side. Regardless of which corner position the liquid accumulates at, it must flow from the corner position. The drainage path is extended to the center. When the drain valve is set at a diagonal position, even if the level sensor at the corner far from the drain valve detects that the liquid level is higher than the first preset height, the nearest drain valve can be opened to achieve precise and rapid drainage. In order to speed up the drainage rate, the first drain valve 70 and the second drain valve 71 can be opened at the same time. That is, when the level sensor at the corner where no drain valve is set detects that the liquid level is higher than the first preset height, the first drain valve 70 and the second drain valve 71 are opened at the same time to facilitate drainage.

[0085] Based on the aforementioned battery pack, this application also provides a method for leakage protection. Please refer to [link to relevant documentation]. Figure 5 and Figure 6 As shown, in the first embodiment of this application, the leakage protection method includes the following steps:

[0086] S10. Each insulation resistance sensor 40 monitors the resistance at its respective location in real time, the pressure sensor 23 monitors the pressure in the inlet pipe 22 in real time, and each first liquid level sensor 60 and each second liquid level sensor 61 monitor the liquid level height at their respective locations in real time.

[0087] S20. If the resistance value detected by any insulation resistance sensor 40 is less than the preset resistance value, and the pressure detected by the pressure sensor 23 is less than the preset pressure, the battery management system 50 controls the liquid inlet pipe 22 to be shut off through the first control valve 24, and the battery management system 50 also controls the liquid outlet pipe 25 to be shut off through the second control valve 26, thereby preventing the coolant from continuing to enter the liquid cooling plate 21 and avoiding the continuous increase of leakage.

[0088] Thus, only when the resistance value detected by any insulation resistance sensor 40 is less than the preset resistance value, and the pressure detected by the pressure sensor 23 is less than the preset pressure, can it be determined that there is leakage in the collector tank 31, and that the leakage is coolant leakage. Only then will the first control valve 24 and the second control valve 26 control the inlet pipe 22 and outlet pipe 25 to be shut off, preventing more coolant from entering the liquid cooling plate 21 and causing the leakage to continue to increase. Compared with the prior art, this application avoids blindly cutting off the coolant circulation path, which would greatly reduce the heat dissipation capacity of the battery module 10, ensuring the cooling effect of the battery module 10 and thus reducing the risk of thermal runaway of the battery module 10.

[0089] It should be noted that if the insulation resistance sensor 40 detects a resistance value less than the preset resistance value, and the pressure sensor 23 detects a pressure greater than or equal to the preset pressure, it indicates that the leakage in the manifold 31 is not coolant leakage, i.e., there is no coolant leakage. At this time, the battery management system 50 transmits information to the vehicle, causing the vehicle to take measures such as limiting output power to reduce speed and / or alerting the driver to pull over.

[0090] In a specific embodiment, step S30 is included after step S20:

[0091] If at least one of the first liquid level sensors 60 and the second liquid level sensors 61 detects a liquid level greater than a first preset liquid level, the battery management system 50 controls the relay 14 to disconnect, thereby cutting off the electrical connection between the battery module 10 and the outside world to prevent a short circuit due to excessive liquid level. It should be noted that when the liquid level in the collector tank 31 reaches the first preset liquid level, there is a risk of short circuit due to leakage into the electrical components inside the battery pack housing 81. Therefore, it is necessary to immediately disconnect the conductive circuit (i.e., control the relay 14 to disconnect).

[0092] Furthermore, step S30 is followed by step S40:

[0093] The battery management system 50 controls the opening of the first drain valve 70 and / or the second drain valve 71, thereby using the first drain valve 70 and / or the second drain valve 71 to drain the leaked liquid in the collector 31 to the outside of the battery pack housing 81, preventing the liquid level from continuing to increase.

[0094] Furthermore, step S50 is included after step S40:

[0095] If the liquid level detected by each of the first liquid level sensors 60 and each of the second liquid level sensors 61 is lower than the first preset liquid level, the battery management system 50 controls the relay 14 to close. It should be noted that when the liquid level leaking into the collector 31 is lower than the first preset height, the risk of short circuit due to contact between the electrical components in the battery pack and the leaking liquid is eliminated. At this time, the conductive circuit can be made open (i.e., the relay 14 is controlled to close), thereby restoring the power of the entire vehicle.

[0096] Furthermore, step S60 is included after step S50:

[0097] If the liquid level height detected by each of the first liquid level sensors 60 is less than the second preset liquid level height, the battery management system 50 controls the first drain valve 70 to shut off, thereby stopping the first drain valve 70 located at the first end a1 from draining liquid. This can prevent liquid outside the battery pack from entering the battery pack housing 81 through the first drain valve 70 when the vehicle is wading through water, and also prevent the risk of foreign objects entering the battery pack housing 81.

[0098] If the liquid level height detected by each of the second liquid level sensors 61 is less than the second preset liquid level height, the battery management system 50 controls the second drain valve 71 to shut off, thereby stopping the drain valve 71 located at the second end a2. This can prevent liquid outside the battery pack from entering the battery pack housing 81 through the second drain valve 71 when the vehicle is wading through water, and can also prevent the risk of foreign objects entering the battery pack housing 81.

[0099] It should be noted that when the liquid level in the collection tank 31 is lower than the second preset liquid level, the risk of short circuit due to contact between the electrical components in the battery pack housing 81 and the leaking liquid is eliminated. At this time, because the liquid level in the collection tank 31 is low, the first drain valve 70 and the second drain valve 71 may not be able to continue draining. Therefore, it is necessary to control the first drain valve 70 and the second drain valve 71 to shut off in time, which can also prevent foreign objects from entering the housing 81.

[0100] Please see Figure 7 and Figure 9 As shown, in the second embodiment of this application, the second embodiment is similar to the first embodiment. The differences between the second embodiment and the first embodiment are described below:

[0101] Step S40 is included after step S30:

[0102] If at least one first liquid level sensor 60 detects a liquid level greater than or equal to a first preset liquid level, and all second liquid level sensors 61 detect liquid levels less than the first preset liquid level, the battery management system 50 controls the first drain valve 70 to open, thereby allowing the first drain valve 70 located at the first end a1 to drain the leaking liquid in the collector 31 to the outside of the battery pack housing 81. It should be noted that at this time, due to factors such as the vehicle going uphill or downhill, or acceleration and deceleration, the liquid level at the first end a1 in the collector 31 is higher than the liquid level at the second end a2. Therefore, only the first drain valve 70 located at the first end a1 needs to be opened for draining, which is beneficial for achieving precise draining and also avoids opening another vent valve, which could lead to foreign objects entering and reduce risk.

[0103] Furthermore, step S50 is included after step S40:

[0104] If the liquid level detected by at least one second liquid level sensor 61 is greater than or equal to the second preset liquid level, the battery management system 50 controls the second drain valve 71 to open (at this time, the first drain valve 70 and the second drain valve 71 drain liquid simultaneously), thereby using the second drain valve 71 to assist in draining liquid and increase the draining efficiency.

[0105] Furthermore, step S60 is included after step S50:

[0106] If the liquid level height detected by each of the first liquid level sensors 60 and each of the second liquid level sensors 61 is less than the first preset liquid level height, it indicates that the risk of short circuit due to contact between the electrical components in the battery pack housing 81 and the leakage has been eliminated. At this time, the battery management system 50 controls the relay 14 to close, so that the conductive circuit is connected and the vehicle regains power.

[0107] If the liquid level height detected by each of the first liquid level sensors 60 is less than the second preset liquid level height, it indicates that the liquid level height of the leakage in the collection tank 31 at the first end a1 is low, causing the first drain valve 70 to be unable to continue draining. At this time, the battery management system 50 controls the first drain valve 70 to shut off.

[0108] If the liquid level height detected by each of the second liquid level sensors 61 is lower than the second preset liquid level height, it indicates that the liquid level of the leak in the collection tank 31 at the second end a2 is low, causing the second drain valve 71 to be unable to continue draining. At this time, the battery management system 50 controls the second drain valve 71 to shut off.

[0109] Please see Figure 8 and Figure 9 As shown, in the third embodiment of this application, the third embodiment is similar to the second embodiment. The differences between the third embodiment and the second embodiment are described below:

[0110] Step S40 is included after step S30:

[0111] If the liquid level detected by the first liquid level sensor 60 is less than the first preset liquid level, and the liquid level detected by the second liquid level sensor 61 is greater than or equal to the first preset liquid level, the battery management system 50 controls the second drain valve 71 to open, thereby allowing the second drain valve 71 located at the second end a2 to drain the leaking liquid in the collector 31 to the outside of the battery pack. It should be noted that at this time, due to factors such as the vehicle going uphill or downhill or accelerating and decelerating, the liquid level at the second end a2 in the collector 31 is higher than the liquid level at the first end a1. Therefore, it is only necessary to open the second drain valve 71 located at the second end a2 to drain the liquid, which is beneficial for achieving precise draining.

[0112] Step S40 is followed by step S50:

[0113] If the liquid level detected by at least one first liquid level sensor 60 is greater than or equal to the second preset liquid level, the battery management system 50 controls the first drain valve 70 to open, thereby using the first drain valve 70 to assist in draining (at this time, the first drain valve 70 and the second drain valve 71 drain simultaneously), increasing the draining efficiency.

[0114] Step S50 is followed by step S60:

[0115] If the liquid level height detected by each first liquid level sensor 60 and each second liquid level sensor 61 is less than the first preset liquid level height, it indicates that the risk of short circuit due to contact between the electrical components in the battery pack and the leakage has been eliminated. At this time, the battery management system 50 controls the relay 14 to close, so that the conductive circuit is connected and continues to provide power to the whole vehicle.

[0116] If the liquid level height detected by each of the first liquid level sensors 60 is less than the second preset liquid level height, it indicates that the liquid level at the first end a1 of the collection tank 31 is low, causing the first drain valve 70 to be unable to continue draining. At this time, the battery management system 50 controls the first drain valve 70 to shut off.

[0117] If the liquid level detected by each of the second liquid level sensors 61 is less than the second preset liquid level, it indicates that the liquid level at the second end a2 of the collection tank 31 is low, causing the second drain valve 71 to be unable to continue draining. At this time, the battery management system 50 controls the second drain valve 71 to shut off.

[0118] Please see Figure 10 As shown, in the fourth embodiment of this application, the fourth embodiment is similar to the third embodiment. The differences between the fourth embodiment and the third embodiment are described below:

[0119] Step S40 is included after step S30:

[0120] If the liquid level detected by at least one first liquid level sensor 60 is greater than or equal to the first preset liquid level, and the liquid level detected by at least one second liquid level sensor 61 is also greater than or equal to the first preset liquid level, the battery management system 50 controls the first drain valve 70 and the second drain valve 71 to open, so that the first drain valve 70 located at the first end a1 and the second drain valve 71 located at the second end a2 simultaneously discharge the leaked liquid in the collector 31 to the outside of the battery pack.

[0121] Step S40 is followed by step S50:

[0122] If the liquid level height detected by each first liquid level sensor 60 and each second liquid level sensor 61 is less than the first preset liquid level height, it indicates that the risk of short circuit due to contact between the electrical components in the battery pack and the leakage has been eliminated. At this time, the battery management system 50 controls the relay 14 to close, so that the conductive circuit is connected and continues to provide power to the whole vehicle.

[0123] If the liquid level height detected by each of the first liquid level sensors 60 is less than the second preset liquid level height, it indicates that the liquid level of the leak in the collection tank 31 at the first end a1 is low, causing the first drain valve 70 to be unable to continue draining. At this time, the battery management system 50 controls the first drain valve 70 to shut off.

[0124] If the liquid level height detected by each of the second liquid level sensors 61 is lower than the second preset liquid level height, it indicates that the liquid level at the second end a2 of the collection tank 31 is low, causing the second drain valve 71 to be unable to continue draining. At this time, the battery management system 50 controls the second drain valve 71 to shut off.

[0125] This application provides a leakage detection and handling method that can directly detect whether the liquid cooling plate 21 is leaking, improving the accuracy of leakage detection and avoiding the accidental shutdown of the liquid cooling plate 21 due to false detection of leakage, which would affect the cooling effect. At the same time, it can accurately handle the leakage according to the situation, improving overall work efficiency and safety while ensuring drainage efficiency. It can detect leakage under different working conditions and then perform corresponding drainage treatment. During drainage, it can improve drainage efficiency so that the leakage can be discharged as soon as possible, while also avoiding the situation where the leakage accumulates and cannot be discharged. In addition, it can shut down the drainage in time according to the detection situation, improving overall safety and practicality.

[0126] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Battery module (10); The liquid cooling assembly includes a liquid cooling plate (21), an inlet pipe (22), a pressure sensor (23), and a first control valve (24); the battery module (10) is disposed on the liquid cooling plate (21), the inlet pipe (22) is connected to the inlet (211) of the liquid cooling plate (21), the pressure sensor (23) and the first control valve (24) are both installed on the inlet pipe (22), the pressure sensor (23) is used to detect the pressure in the inlet pipe (22), and the first control valve (24) is used to control the inlet pipe (22) to be open or closed; The liquid collection unit (30) has a collection groove (31) arranged around the periphery of the liquid cooling plate (21), the collection groove (31) being used to collect leaked liquid; An insulation resistance sensor (40) is installed in the current collection tank (31) to detect the resistance at its location; The battery management system (50) is electrically connected to the pressure sensor (23), the first control valve (24) and the insulation resistance sensor (40); the battery management system (50) is used to control the liquid inlet pipe (22) to be shut off through the first control valve (24) according to the detection results of the insulation resistance sensor (40) and the pressure sensor (23).

2. The battery pack according to claim 1, characterized in that, The liquid cooling plate (21) has a cooling area and a peripheral area surrounding the cooling area on the side surface facing the battery module (10); the battery module (10) is disposed in the cooling area, the liquid collecting component (30) is disposed in the peripheral area, and the flow channel (31) is opened on the side of the liquid collecting component (30) away from the liquid cooling plate (21).

3. The battery pack according to claim 2, characterized in that, The liquid collecting component (30) also has a first flow guiding slope (32) located outside the flow collecting groove (31). The first flow guiding slope (32) is arranged around the flow collecting groove (31). The height of the inner side of the first flow guiding slope (32) relative to the liquid cooling plate (21) is the first inner height. The height of the outer side of the first flow guiding slope (32) relative to the liquid cooling plate (21) is the first outer height. The first outer height is greater than the first inner height. The liquid collecting component (30) also has a second flow guiding slope (33) located between the flow collecting groove (31) and the battery module (10). The second flow guiding slope (33) is arranged around the battery module (10). The height of the inner side of the second flow guiding slope (33) relative to the liquid cooling plate (21) is the second inner height, and the height of the outer side of the second flow guiding slope (33) relative to the liquid cooling plate (21) is the second outer height. The second inner height is greater than the second outer height.

4. The battery pack according to claim 3, characterized in that, The liquid collecting component (30) also has a first drainage groove (34) and a first clearance hole (36). The first drainage groove (34) is opened on the second drainage inclined surface (33) and communicates with the liquid collecting groove (31). The first clearance hole (36) is located in the first drainage groove (34) and extends through the first drainage groove (34) to the side of the liquid collecting component (30) facing the liquid cooling plate (21). One end of the liquid inlet pipe (22) passes through the first clearance hole (36) and is connected to the liquid inlet (211) of the liquid cooling plate (21). The insulation resistance sensor (40) is provided in the first drainage groove (34).

5. The battery pack according to any one of claims 1 to 4, characterized in that, The battery pack also includes a first drain valve (70), a first liquid level sensor (60), a second drain valve (71), and a second liquid level sensor (61), all of which are electrically connected to the battery management system (50). The liquid collecting component (30) has a first end (a1) and a second end (a2) at its two ends in a preset direction (X). The first drain valve (70) is connected to the portion of the collecting trough (31) located at the first end (a1), and the second drain valve (71) is connected to the portion of the collecting trough (31) located at the second end (a2). The first liquid level sensor (60) is installed in the collecting trough (31) and located at the first end (a1), and the second liquid level sensor (61) is installed in the collecting trough (31) and located at the second end (a2). The battery management system (50) is used to control the first drain valve (70) to open or close according to the detection result of the first liquid level sensor (60), and is also used to control the second drain valve (71) to open or close according to the detection result of the second liquid level sensor (61).

6. A method for leakage protection applied to a battery pack as described in any one of claims 1 to 4, characterized in that, Includes the following steps: The insulation resistance sensor (40) monitors the resistance at its location in real time, and the pressure sensor (23) monitors the pressure inside the liquid inlet pipe (22) in real time. If the resistance value detected by the insulation resistance sensor (40) is less than the preset resistance value, and the pressure detected by the pressure sensor (23) is less than the preset pressure, the battery management system (50) controls the liquid inlet pipe (22) to be shut off through the first control valve (24).

7. The leakage protection method according to claim 6, characterized in that, The battery pack also includes a first drain valve (70), a first liquid level sensor (60), a second drain valve (71), and a second liquid level sensor (61), all electrically connected to the battery management system (50). The liquid collection component (30) has a first end (a1) and a second end (a2) in a preset direction (X). The first drain valve (70) is connected to the portion of the collection tank (31) located at the first end (a1), and the second drain valve (71) is connected to the portion of the collection tank (31) located at the second end (a2). The first liquid level sensor (60) is installed in the collection tank (31) and located at the first end (a1), and the second liquid level sensor (61) is installed in the collection tank (31) and located at the second end (a2). The battery management system (50) is used to control the first drain valve (70) to open or close according to the detection result of the first liquid level sensor (60), and is also used to control the second drain valve (71) to open or close according to the detection result of the second liquid level sensor (61). The first liquid level sensor (60) and the second liquid level sensor (61) respectively monitor the liquid level height at their respective locations in real time; After the first control valve (24) controls the inlet pipe (22) to shut off, the method further includes: If the liquid level detected by at least one of the first liquid level sensor (60) and the second liquid level sensor (61) is greater than the first preset liquid level, the battery management system (50) controls the relay (14) to disconnect.

8. The leakage protection method according to claim 7, characterized in that, The battery management system (50) further includes the following steps after controlling the relay (14) to disconnect: The battery management system (50) controls the opening of the first drain valve (70) and / or the second drain valve (71); If the liquid level height detected by the first liquid level sensor (60) and the second liquid level sensor (61) is both less than the first preset liquid level height, the battery management system (50) controls the relay (14) to close. If the liquid level detected by the first liquid level sensor (60) is less than the second preset liquid level, the battery management system (50) controls the first drain valve (70) to shut off; wherein the second preset liquid level is less than the first preset liquid level. If the liquid level detected by the second liquid level sensor (61) is less than the second preset liquid level, the battery management system (50) controls the second drain valve (71) to shut off.

9. The leakage protection method according to claim 7, characterized in that, The process further includes, after the step of the battery management system (50) controlling the relay (14) to disconnect: If the liquid level height detected by the first liquid level sensor (60) is greater than or equal to the first preset liquid level height, and the liquid level height detected by the second liquid level sensor (61) is less than the first preset liquid level height, the battery management system (50) controls the first drain valve (70) to open. If the liquid level detected by the second liquid level sensor (61) is greater than or equal to the second preset liquid level, the battery management system (50) controls the second drain valve (71) to open; wherein the second preset liquid level is less than the first preset liquid level. If the liquid level height detected by the first liquid level sensor (60) and the second liquid level sensor (61) is both less than the first preset liquid level height, the battery management system (50) controls the relay (14) to close. If the liquid level detected by the first liquid level sensor (60) is less than the second preset liquid level, the battery management system (50) controls the first drain valve (70) to shut off. If the liquid level detected by the second liquid level sensor (61) is less than the second preset liquid level, the battery management system (50) controls the second drain valve (71) to shut off.

10. The leakage protection method according to claim 7, characterized in that, The process further includes, after the step of the battery management system (50) controlling the relay (14) to disconnect: If the liquid level height detected by the second liquid level sensor (61) is greater than or equal to the first preset liquid level height, and the liquid level height detected by the first liquid level sensor (60) is less than the first preset liquid level height, the battery management system (50) controls the second drain valve (71) to open. If the liquid level detected by the first liquid level sensor (60) is greater than or equal to the second preset liquid level, the battery management system (50) controls the first drain valve (70) to open; wherein the second preset liquid level is less than the first preset liquid level.

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