Battery pack and repairing method thereof

Abstract

The invention discloses a battery pack and a repairing method thereof, and belongs to the technical field of power batteries, the battery pack comprises a box body and a liquid cooling plate, the box body comprises a bottom plate, and the liquid cooling plate is arranged in the box body and connected with the bottom plate; wherein the liquid cooling plate can be heated to reset under the condition of deformation. The deformation of the liquid cooling plate can be reset through heating, so that the reuse rate of the liquid cooling plate is effectively improved, the rejection rate of the liquid cooling plate can be reduced after the battery pack is collided and deformed, the maintenance and replacement rate is reduced, the maintenance cost is also reduced, and the service life of the whole battery pack is prolonged.

Description

Technical Field

[0001] This application belongs to the technical field of power batteries, and particularly relates to a battery pack and a repair method thereof. Background Art

[0002] Most battery packs use aluminum, steel, composite materials, etc. as the materials for key components such as the lower tray, bottom plate, and cooling plate of the battery pack. When the battery pack undergoes conditions such as scraping the bottom or hitting the bottom, most of the above key components will have irreversible deformation and damage, resulting in the need to replace key components or even the entire battery pack, leading to poor repair performance and high cost of the battery pack. Summary of the Invention

[0003] Object of the Invention: The embodiments of this application provide a battery pack, aiming to solve the problem that when the existing battery pack undergoes conditions such as scraping the bottom or hitting the bottom, resulting in deformation and damage of the bottom components, it is necessary to replace key components or even the entire battery pack, leading to poor repair performance and high cost of the battery pack; another object of the embodiments of this application is to provide a repair method for the battery pack.

[0004] Technical Solution: A battery pack according to an embodiment of this application includes:

[0005] A box body, including a bottom plate;

[0006] A liquid cooling plate, disposed in the box body and connected to the bottom plate;

[0007] Wherein, when the liquid cooling plate is deformed, it can be reset by heating.

[0008] In some embodiments, the liquid cooling plate is integrally formed by a shape memory alloy.

[0009] In some embodiments, it further includes:

[0010] A battery management component, disposed in the box body;

[0011] A first liquid monitoring component, disposed at the outlet end of the liquid cooling plate and communicatively connected to the battery management component, for detecting at least one of the flow rate, flow resistance, and temperature of the liquid at the outlet end.

[0012] In some embodiments, it further includes a second liquid monitoring component, which is disposed at the inlet end of the liquid cooling plate and communicatively connected to the battery management component, for detecting at least one of the flow rate, flow resistance, and temperature of the liquid at the inlet end.

[0013] In some embodiments, it further includes a collision monitoring component, which is disposed between the liquid cooling plate and the bottom plate and connected to the liquid cooling plate or the bottom plate, and the collision monitoring component is communicatively connected to the battery management component.

[0014] In some embodiments, the heat sources for the liquid cooling plate to be reset by heat when deformed include: heating by the liquid temperature rise in the liquid cooling plate or heating by an external heating component.

[0015] Correspondingly, a repair method for a battery pack according to an embodiment of the present application, the battery pack includes a liquid cooling plate and a bottom plate connected to each other, and the liquid cooling plate can be reset by heat when deformed. The repair method includes:

[0016] Determine that the liquid cooling plate is deformed;

[0017] Remove the bottom plate of the battery pack;

[0018] Heat the deformed liquid cooling plate to reset the deformed part of the liquid cooling plate.

[0019] In some embodiments, heating the deformed liquid cooling plate includes:

[0020] Control the temperature of the liquid in the liquid cooling plate to a first preset temperature to perform a primary repair on the liquid cooling plate;

[0021] Control the temperature of the liquid in the liquid cooling plate to a second preset temperature to perform a secondary repair on the liquid cooling plate.

[0022] In some embodiments, heating the deformed liquid cooling plate includes:

[0023] Determine the deformed part of the liquid cooling plate;

[0024] Set an external heating component at the deformed part to perform heating repair on the deformed part.

[0025] In some embodiments, determining that the liquid cooling plate is deformed includes:

[0026] Obtain the parameters of the liquid at the outlet end of the liquid cooling plate;

[0027] Based on the parameters exceeding the preset range, determine that the liquid cooling plate has local deformation.

[0028] In some embodiments, determining that the liquid cooling plate is deformed further includes:

[0029] Detect whether the bottom plate is collided.

[0030] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application includes a box body and a liquid cooling plate, the box body includes a bottom plate, and the liquid cooling plate is arranged in the box body and connected to the bottom plate; wherein, when the liquid cooling plate is deformed, it can be reset by heat. By setting that the deformation of the liquid cooling plate can be reset by heat, the present application effectively improves the reuse rate of the liquid cooling plate, can reduce the scrap rate of the liquid cooling plate after the battery pack is collided and deformed, thereby reducing the repair and replacement rate, reducing the repair cost, and improving the service life of the whole battery pack.

[0031] Compared with the prior art, a repair method for a battery pack according to an embodiment of the present application. The battery pack includes a liquid cooling plate and a bottom plate connected to each other. The liquid cooling plate can be reset by heating when deformed. The repair method includes: determining that the liquid cooling plate is deformed; removing the bottom plate of the battery pack; heating the deformed liquid cooling plate to reset the deformed part of the liquid cooling plate. The repair method for the battery pack of the present application can, after the liquid cooling plate of the battery pack is deformed, heat the liquid cooling plate to reset the deformed part of the liquid cooling plate, thereby improving the service life of the liquid cooling plate and reducing the maintenance and replacement cost of the battery pack. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 is an exploded view of a battery pack according to an embodiment of the present application;

[0034] Figure 2 is a top view of a battery pack according to an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of a deformed liquid cooling plate according to an embodiment of the present application;

[0036] Figure 4 is Figure 3 an enlarged view of part A in

[0037] Figure 5 is a schematic structural diagram of heating the deformed part of a liquid cooling plate with an external heating component according to an embodiment of the present application;

[0038] Figure 6 is a flowchart of a repair method for a battery pack according to an embodiment of the present application;

[0039] Figure 7 is a flowchart of self-heating repair of a liquid cooling plate in a repair method for a battery pack according to an embodiment of the present application;

[0040] Figure 8 is a flowchart of repairing a liquid cooling plate with an external heating component in a repair method for a battery pack according to an embodiment of the present application;

[0041] Figure 9 is a flowchart of determining that a liquid cooling plate is deformed according to an embodiment of the present application.

[0042] Description of the Reference Numerals:

[0043] 100, Box; 110, Bottom Plate; 200, Liquid Cooling Plate; 210, Outlet End; 220, Inlet End; 230, Bottom Surface; 231, Cooling Flow Channel; 232, Deformed Portion; 300, Battery Management Component; 400, First Liquid Monitoring Component; 500, Second Liquid Monitoring Component; 600, Collision Monitoring Component; 700, Battery Pack; 800, External Heating Component. Detailed Embodiment

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, and at least one means one, two or more, unless otherwise specifically defined. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical. For example, within the range of an included angle of 80° to 100°, it is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel. For example, within the range of 10° of complete parallelism, it is considered parallel.

[0046] In the related art, most battery packs use aluminum, steel, composite materials, etc. as the manufacturing materials for key components such as the battery pack lower tray, bottom plate 110, and cooling plate. When the battery pack undergoes conditions such as scraping the bottom or hitting the bottom, most of the above key components will undergo irreversible deformation and damage, resulting in the battery pack being unable to continue to be used, thus requiring the replacement of key components or even the entire battery pack, resulting in poor maintainability and high costs.

[0047] In view of this, the embodiments of the present application provide a battery pack, aiming to solve the above problems.

[0048] Please refer toFigure 1 and Figure 2 A battery pack includes a box body 100 and a liquid cooling plate 200, wherein the box body 100 includes a bottom plate 110, and the liquid cooling plate 200 is disposed in the box body 100 and connected to the bottom plate 110; wherein the liquid cooling plate 200 can be reset by heat when deformed.

[0049] In the embodiment of the present application, the deformation of the liquid cooling plate 200 is configured to be reset by heat, thereby effectively improving the reuse rate of the liquid cooling plate 200. After the battery pack is deformed by a collision, the scrap rate of the liquid cooling plate 200 can be reduced, thereby reducing the repair and replacement rate, reducing the repair cost, and increasing the service life of the entire battery pack.

[0050] It should be noted that the premise for the liquid cooling plate 200 of the embodiment to be reused after being heated and reset is that the liquid cooling plate 200 is only deformed, but the cooling channel 231 does not leak. In this case, by heating and resetting the liquid cooling plate 200, the liquid cooling plate 200 can be put into use again, thereby improving the maintainability of the battery pack and reducing the maintenance cost.

[0051] Specifically, the battery pack of the embodiment of the present application may include a battery pack 700, which is arranged in the box 100 and is located on the side of the liquid cooling plate 200 away from the bottom plate 110. At the same time, the liquid cooling plate 200 can be glued to the battery pack 700, and a thermal conductive glue can be arranged between the two to improve the heat exchange rate. Among them, when the liquid cooling plate 200 is deformed and the flow resistance is large, if the liquid cooling plate 200 cannot be reset, it is necessary to replace the liquid cooling plate 200. However, since the battery pack 700 is glued to the liquid cooling plate 200, the liquid cooling plate 200 is not easy to replace. At this time, it may be necessary to consider directly replacing the entire battery pack, resulting in poor maintenance and high maintenance costs. However, the present application provides a liquid cooling plate 200 that can be reset by heating. At this time, there is no need to replace the liquid cooling plate 200, and only the bottom plate 110 and other components need to be replaced, which effectively improves the maintenance performance of the battery pack and greatly reduces the maintenance cost.

[0052] Among them, the liquid cooling plate 200 of the present application is formed by molding a plurality of concave and convex structures to form a cooling channel 231, and the coolant forms a loop in the cooling channel 231 for cooling and heating the battery pack 700. The bottom plate 110 can be made of aluminum alloy, and the liquid cooling plate 200 is fixed between the bottom plate 110 and the battery pack 700 by gluing or the like. The battery pack may also include a bottom guard plate, which is made of steel and has good structural strength. The bottom guard plate is installed on the side of the bottom plate 110 away from the liquid cooling plate 200, and its outer surface can be sprayed with a protective coating to improve its durability. The bottom guard plate can be fixed to the bottom plate 110 by Roger riveting or the like, so that the bottom guard plate is replaceable. Of course, the bottom plate 110 can also be a detachable structure to facilitate subsequent maintenance and replacement.

[0053] In some embodiments, the liquid cooling plate 200 is integrally formed by a shape memory alloy.

[0054] In the embodiments of the present application, the liquid cooling plate 200 is integrally formed by a shape memory alloy. After the liquid cooling plate 200 is deformed by collision, the deformed part of the liquid cooling plate 200 can be reset by heating, thereby improving the service life of the liquid cooling plate 200, reducing the replacement frequency of the liquid cooling plate 200, further improving the maintainability of the battery pack, and reducing the maintenance cost.

[0055] It should be noted that the shape memory alloy material has shape memory effect and superelasticity. The shape memory alloy of the present application can adopt a one-way shape memory alloy. After the one-way shape memory alloy is heated to a certain temperature, its shape can be restored to the original state and remains in the shape after cooling. Thus, after the liquid cooling plate 200 made of shape memory alloy is deformed, by heating the deformed part 232, the shape memory alloy can be reset and maintain the reset shape after the temperature drops, so as to realize the reset repair of the liquid cooling plate 200 and enable the liquid cooling plate 200 to be put into use again. Only the bottom plate 110 and the corresponding bottom guard plate need to be replaced.

[0056] Certainly, the liquid cooling plate 200 of the present application is integrally formed by a shape memory alloy, which can not only realize the thermal reset of the liquid cooling plate 200 after deformation. At the same time, the integrally formed liquid cooling plate 200 (such as integrally formed by processes such as laser cladding or 3D printing) can effectively reduce joints. At the same time, the shape memory alloy has good corrosion resistance (the corrosion resistance to electrolyte is better than that of copper alloy), which can significantly reduce the leakage probability.

[0057] In addition, the shape memory alloy has a high strength-to-weight ratio (the tensile strength can reach more than 1000 MPa), which allows the liquid cooling plate 200 to adopt thinner plates (the thickness can be reduced by 30%-50%), reducing the overall weight while maintaining the structural strength, which is more conducive to the lightweight of the battery pack.

[0058] It should also be noted that the shape memory alloy has excellent superelasticity and fatigue resistance. Under the vibration or collision impact during vehicle driving, the structure of the liquid cooling plate 200 is not likely to generate cracks or solder joint detachment due to deformation, reducing the risk of coolant leakage; at the same time, the elastic deformation of the shape memory alloy can absorb vibration energy and extend the service life of the liquid cooling plate 200.

[0059] It should also be noted that the liquid cooling plate 200 of the present application is made of shape memory alloy. Specifically, it is shaped into the target shape, that is, the concave-convex cooling flow channel 231, by heat treatment (annealing) at a high-temperature austenite phase (such as nitinol heated to 400 to 500 °C). At this time, its atomic arrangement forms a stable crystal structure, and this state is memorized as the default form. Then, the liquid cooling plate 200 maintains this form for the coolant to flow and exchange heat. When the shape memory alloy cools to the martensite phase (low-temperature phase), the material becomes relatively soft and can be deformed by external forces (such as bending and compression) without breaking atomic bonds. At this time, the deformed shape is determined by the external force, but the shape memory alloy still remembers the shape of the original austenite state. That is, it is in the deformed state after being deformed by an external force collision. Reheating the shape memory alloy to the austenite phase transition temperature (such as the phase transition temperature range of nitinol is usually 30 to 80 °C), the martensite reversely transforms into austenite, and the atomic arrangement returns to the original structure set during heat treatment, and the shape also returns accordingly. Therefore, when the liquid cooling plate 200 is initially formed, the shape memory alloy forms the initial shape of the liquid cooling plate 200 through high temperature. Subsequently, when the liquid cooling plate 200 is deformed, it is reset by heating. At this time, the heating temperature is much lower than the forming temperature of the initial liquid cooling plate 200. Therefore, the liquid cooling plate 200 will not lose the overall structure of the cooling flow channel 231 due to heating.

[0060] Please refer to Figure 1 and Figure 2 , in some embodiments, it further includes a battery management component 300 and a first liquid monitoring component 400. The battery management component 300 is disposed in the box body 100, and the first liquid monitoring component 400 is disposed at the outlet end 210 of the liquid cooling plate 200 and is communicatively connected to the battery management component 300 for detecting at least one of the flow rate, flow resistance, and temperature of the liquid at the outlet end 210.

[0061] In the embodiments of the present application, by disposing the first liquid monitoring component 400 at the outlet end 210 of the liquid cooling plate 200, it is possible to monitor at least one of the flow rate, flow resistance, and temperature and other relevant information of the coolant at the outlet end 210 of the liquid cooling plate 200 during normal heat exchange operation. By judging whether the liquid information such as the flow rate, flow resistance, and temperature of the coolant at the outlet end 210 is abnormal, it is possible to judge whether there is a deformed part 232 in the cooling flow channel 231. Furthermore, it is possible to repair the battery pack in time and reset and repair the liquid cooling plate 200 in time.

[0062] Specifically, such as Figure 3 and Figure 4As shown, in the embodiment of the present application, after the bottom of the battery pack is knocked, some or multiple cooling channels 231 protruding from the bottom surface 230 of the liquid cooling plate 200 may have concave deformation parts 232. At this time, the flow resistance of the liquid cooling plate 200 will increase, the flow velocity will decrease, and there will also be a difference between the temperature of the coolant after heat exchange and the expected circulating heat exchange temperature. Therefore, the first liquid monitoring component 400 can detect the above abnormal information and feedback the abnormal information to the battery management component 300. The battery management component 300 can correspondingly feedback this information to the vehicle control system to obtain the deformation information of the liquid cooling plate 200, and then can perform targeted battery pack maintenance and corresponding repair of the liquid cooling plate 200. Among them, the repair of the liquid cooling plate 200 can be carried out by heating the deformed part 232 to restore its initial shape.

[0063] Please refer to Figure 1 and Figure 2 , in some embodiments, it further includes a second liquid monitoring component 500. The second liquid monitoring component 500 is arranged at the inlet end 220 of the liquid cooling plate 200 and is communicatively connected to the battery management component 300, and is used to detect at least one of the flow velocity, flow resistance, and temperature of the liquid at the inlet end 220.

[0064] In the embodiment of the present application, the designer arranges the second liquid monitoring component 500 at the inlet end 220 of the liquid cooling plate 200, which can further collect relevant parameter information of the liquid initially input into the liquid cooling plate 200. At this time, it is convenient to compare with the relevant parameter information obtained by the first liquid monitoring component 400, so as to more accurately judge whether there is an abnormality in the relevant parameter information of the liquid (coolant) output from the outlet end 210 of the coolant.

[0065] It should be noted that the first liquid monitoring component 400 and the second liquid monitoring component 500 in the embodiment of the present application can be sensors with corresponding functions, such as a liquid flow velocity sensor for flow velocity detection, a temperature sensor for temperature detection, and a sensor for liquid flow resistance detection, etc.

[0066] Such as Figure 2 As shown, in some embodiments, it further includes a collision monitoring component 600. The collision monitoring component 600 is arranged between the liquid cooling plate 200 and the bottom plate 110 and is connected to the liquid cooling plate 200 or the bottom plate 110. The collision monitoring component 600 is communicatively connected to the battery management component 300.

[0067] In the embodiments of the present application, by arranging a collision monitoring component 600 between the liquid cooling plate 200 and the bottom plate 110, it is possible to detect in real time whether the battery pack is collided or knocked during vehicle driving, and more accurately identify whether the liquid cooling plate 200 of the battery pack is collided and abnormal. The battery management component 300 obtains the abnormal information of the collision monitoring component 600 in real time and reports the relevant information to the vehicle control system, so as to facilitate real-time acquisition of the safety status information of the battery pack and facilitate timely maintenance of the battery pack.

[0068] It should be noted that the collision monitoring component 600 in the embodiments of the present application may be a collision sensor.

[0069] It should also be noted that the collision monitoring component 600 in the embodiments of the present application can be used in combination with the first liquid monitoring component 400 and the second liquid monitoring component 500, so as to more accurately identify whether the liquid cooling plate 200 of the battery pack has collided and become abnormal.

[0070] In some embodiments, the heat sources that enable the liquid cooling plate 200 to be reset by heat when deformed include: heating by the liquid temperature rise inside the liquid cooling plate 200, or heating by an external heating component 800.

[0071] In the embodiments of the present application, by circulating and inputting and outputting high-temperature liquid through the liquid cooling plate 200 to heat the liquid cooling plate 200, the reset repair of the deformed part 232 of the liquid cooling plate 200 can be realized. Of course, it is also possible to use the external heating component 800 to perform targeted local heating on the deformed part 232 for heating to achieve rapid reset of the liquid cooling plate 200.

[0072] It should be noted that the liquid cooling plate 200 in the embodiments of the present application is usually connected to an external liquid circulation system. By controlling the temperature of the internal liquid and circulating and transporting the high-temperature liquid into the liquid cooling plate 200, the temperature of the liquid cooling plate 200 can be increased. After multiple circulations, the sunken deformed part 232 will gradually recover.

[0073] As Figure 5 shown, it should also be noted that the external heating component 800 in the embodiments of the present application may be a heating film. At this time, the heating film is attached to the deformed part 232, and by being heated to a certain temperature by energization, the reset repair of the deformed part 232 can be realized. The external heating component 800 may also be an infrared heating component or an electromagnetic heating component. By bringing the infrared heating component or the electromagnetic heating component close to or in contact with the deformed part 232 for heat exchange, the reset repair of the deformed part 232 is realized after reaching a certain temperature.

[0074] Correspondingly, a method for repairing a battery pack according to an embodiment of the present application. The battery pack includes a liquid cooling plate 200 and a bottom plate 110 connected to each other. The liquid cooling plate 200 can be reset by heating when deformed. The repair method includes: determining that the liquid cooling plate 200 is deformed; removing the bottom plate 110 of the battery pack; heating the deformed liquid cooling plate 200 to reset the deformed part 232 of the liquid cooling plate 200.

[0075] In the embodiment of the present application, the repair method of the battery pack can, after the liquid cooling plate 200 of the battery pack is deformed, heat the liquid cooling plate 200 to reset the deformed part 232 of the liquid cooling plate 200, thereby increasing the service life of the liquid cooling plate 200 and reducing the maintenance and replacement cost of the battery pack.

[0076] In the embodiment of the present application, the repair method is mainly applied to the liquid cooling plate 200 that can reset the deformed part 232 by heating. Among them, the liquid cooling plate 200 can be made of shape memory alloy. At this time, the shape memory alloy forms the initial shape of the liquid cooling plate 200 (formed with concave and convex cooling channels 231) through high temperature, and the liquid cooling plate 200 can maintain this shape throughout its life cycle. When local deformation occurs due to collision, by heating the deformed part 232, the reset of the deformed part 232 is realized.

[0077] The repair method of the embodiment of the present application is mainly for the repair of the battery pack after being collided and deformed. Please refer to Figure 6 , and the specific repair method includes the following steps:

[0078] S100: Determine that the liquid cooling plate 200 is deformed.

[0079] S200: Remove the bottom plate 110 of the battery pack.

[0080] S300: Heat the deformed liquid cooling plate 200 to reset the deformed part 232 of the liquid cooling plate 200.

[0081] It should be noted that since the battery pack is assembled and used in the whole vehicle, for the repair of the battery pack, it is necessary to confirm that the battery pack has collided and the liquid cooling plate 200 is indeed deformed before performing battery repair. At the same time, since the bottom plate 110 and the like are structural parts that cannot be restored, therefore, the repair method of the battery pack of the present application is mainly for the repair of the liquid cooling plate 200, and then replace parts such as the bottom plate 110 to complete the repair of the battery pack. Among them, when repairing the liquid cooling plate 200 again, based on the fact that the liquid cooling plate 200 can be reset by heating, heat the deformed part 232, and when the corresponding temperature is reached, the deformation of the liquid cooling plate 200 will gradually reset.

[0082] Please refer to Figure 7 , in some embodiments, heating the deformed liquid cooling plate 200 includes:

[0083] S310: Control the temperature of the liquid in the liquid cooling plate 200 to a first preset temperature to perform a first repair on the liquid cooling plate 200.

[0084] S320: Control the temperature of the liquid in the liquid cooling plate 200 to a second preset temperature to perform a second repair on the liquid cooling plate 200.

[0085] In the embodiment of the present application, the repair of the liquid cooling plate 200 can adopt the self-repair method of the liquid cooling plate 200 itself. At this time, by increasing the temperature of the liquid circulating in the liquid cooling plate 200 until the temperature rises to the first preset temperature, the liquid cooling plate 200 can be gradually reset to achieve the first repair. Continue to increase the temperature of the liquid to the second preset temperature. Through multiple circulations of the liquid, the temperature of the deformed part 232 of the liquid cooling plate 200 can be increased to the second preset temperature, thereby achieving the second repair and achieving the complete repair of the deformed part 232 of the liquid cooling plate 200.

[0086] It should be noted that the embodiment of the present application adopts a multi-level self-repair scheme. For the slightly deformed liquid cooling plate 200, the first repair can be used to complete the repair. For the severely deformed part, the second repair can be used to further increase the temperature of the liquid in the liquid cooling plate 200, thereby performing the second repair to achieve a better repair effect. Adopting a multi-level repair scheme can effectively improve the repair efficiency and reduce the repair energy consumption.

[0087] In the embodiment of the present application, the first preset temperature and the second preset temperature can be correspondingly set according to the specific performance of the shape memory alloy. Usually, the range of the first preset temperature can be from 25°C to 50°C, specifically any value among 25, 30, 35, 40, 45, 50 or the range value between any two values. The range of the second preset temperature can be from 50°C to 90°C, specifically any value among 50, 55, 60, 65, 70, 75, 80, 85, 90 or the range value between any two values. For example, the phase change temperature range of Nitinol (a kind of shape memory alloy) is usually from 30 to 80°C, then the first preset temperature of the liquid cooling plate 200 made of this shape memory alloy can be set to 30°C and the second preset temperature can be set to 80°C during the repair process.

[0088] It should also be noted that in the embodiment of the present application, when the parameters such as the flow rate and flow resistance of the liquid detected by the first liquid level monitoring component meet the preset range, it is determined that the liquid cooling plate 200 has completed the reset repair, and at this time, the heating can be stopped.

[0089] Please refer to Figure 8 , in some embodiments, heating the deformed liquid cooling plate 200 includes:

[0090] S330: Determine the deformed part 232 of the liquid cooling plate 200;

[0091] S340: An external heating component 800 is provided at the deformed part 232 to heat and repair the deformed part 232.

[0092] In the embodiment of the present application, manual repair can also be performed. Specifically, after the bottom plate 110 is removed, by observing the deformed part 232 of the cooling channel 231 of the liquid cooling plate 200, the external heating component 800 is set at the corresponding deformed part 232, and through local heating, the deformed part 232 is reset and repaired. Among them, when heating with an external heating component, the first preset temperature and the second preset temperature can also be correspondingly set for multi-level heating repair, improving the repair efficiency and reducing the repair energy consumption.

[0093] Among them, the external heating component can be a heating film, infrared heating, electromagnetic heating, etc.

[0094] It should be noted that in the embodiment of the present application, it can be determined whether the liquid cooling plate 200 is reset by visual inspection, or whether the parameters at the outlet end 210 of the liquid cooling plate 200 meet the preset range. When the parameters of the liquid at the outlet end 210 meet the preset range, it can be determined that the reset is completed, and the heating can be stopped correspondingly.

[0095] Please refer to Figure 9 , in some embodiments, determining that the liquid cooling plate 200 is deformed includes:

[0096] S120: Obtain the parameters of the liquid at the outlet end 210 of the liquid cooling plate 200;

[0097] S130: Based on the parameters exceeding the preset range, determine that the liquid cooling plate 200 has local deformation.

[0098] In the embodiment of the present application, a first liquid level monitoring component can be correspondingly provided at the outlet end 210 of the liquid cooling plate 200 to correspondingly obtain the parameters of the liquid at the outlet end 210, such as parameters such as flow rate, flow resistance, and temperature. By judging whether the corresponding parameters are abnormal, that is, judging whether the parameters exceed the preset range. When the parameters exceed the preset range, it is correspondingly determined that the liquid cooling plate 200 has local deformation, and at this time, the battery pack can be repaired.

[0099] It should be noted that the preset range in the embodiments of the present application can be that when the flow resistance is greater than 10% - 15% of the rated standard flow resistance of the liquid cooling plate 200, it can be determined at this time that the flow channel of the liquid cooling plate 200 has a deformation problem. For example, if the conventional standard flow resistance is 50 Kpa and the flow resistance exceeds the conventional flow resistance by 5 Kpa, it can be determined that the flow resistance is abnormal. At this time, it can be determined that the cooling flow channel 231 of the liquid cooling plate 200 has a deformation. When the flow velocity of the liquid cooling plate 200 is reduced by 25% - 35% compared with the conventional rated flow velocity, it can be determined that the flow velocity of the liquid cooling plate 200 is abnormal. At this time, it can be determined that the cooling flow channel 231 of the liquid cooling plate 200 has a deformation. When the temperature of the liquid flowing out of the liquid cooling plate 200 exceeds ±30% of the conventional temperature under the same working conditions and environment, it indicates that the temperature of the liquid flowing out of the liquid cooling plate 200 is abnormal. At this time, it can be determined that the cooling flow channel 231 of the liquid cooling plate 200 has a deformation.

[0100] Please refer to Figure 9 , in some embodiments, determining that the liquid cooling plate 200 is deformed further includes:

[0101] S110: Detect whether the bottom plate 110 is collided.

[0102] In the embodiments of the present application, a collision monitoring component 600 can be arranged between the bottom plate 110 and the liquid cooling plate 200 to monitor in real time whether the bottom plate 110 is collided based on the collision monitoring component 600. In the case where the bottom plate 110 is collided, the parameters detected by the first liquid monitoring component 400 can be further combined to confirm whether the liquid cooling plate 200 is deformed. When the bottom plate 110 of the battery pack is collided, but the first liquid monitoring component 400 does not detect parameter abnormalities, it indicates that only the bottom plate 110 is collided and the cooling flow channel 231 of the liquid cooling plate 200 has not deformed. In this case, the situation is not urgent. It is possible to correspondingly check whether the bottom plate 110 is deformed or damaged. If the bottom plate 110 is deformed or damaged, the bottom plate 110 can be correspondingly replaced. If the bottom plate 110 is not deformed or damaged, the bottom plate 110 does not need to be replaced. Nor is it necessary to repair the liquid cooling plate 200.

[0103] Of course, if the first liquid monitoring component 400 is not provided in the embodiments of the present application, after detecting that the bottom plate 110 is collided, it is correspondingly necessary to confirm whether the bottom plate 110 is deformed or damaged. In the case where the bottom plate 110 is deformed or damaged, the bottom plate 110 is removed, and at the same time, it is possible to correspondingly check whether the cooling flow channel 231 of the liquid cooling plate 200 is deformed.

[0104] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0105] The above has introduced in detail a battery pack and its repair method provided by the embodiments of the present application, and specific examples have been used to illustrate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that, Comprising: A box body, including a bottom plate; A liquid cooling plate, disposed inside the box body and connected to the bottom plate; Wherein, when the liquid cooling plate is deformed, it can be reset by heat.

2. The battery pack according to claim 1, wherein The liquid cooling plate is integrally formed by a shape memory alloy.

3. The battery pack according to claim 2, characterized in that, Further comprising: A battery management component, disposed inside the box body; A first liquid monitoring component, disposed at the outlet end of the liquid cooling plate and communicatively connected to the battery management component, for detecting at least one of the flow rate, flow resistance, and temperature of the liquid at the outlet end.

4. The battery pack according to claim 3, characterized in that, Further comprising a second liquid monitoring component, the second liquid monitoring component is disposed at the inlet end of the liquid cooling plate and communicatively connected to the battery management component, for detecting at least one of the flow rate, flow resistance, and temperature of the liquid at the inlet end.

5. The battery pack according to any one of claims 2 to 4, characterized in that, Further comprising a collision monitoring component, the collision monitoring component is disposed between the liquid cooling plate and the bottom plate and connected to the liquid cooling plate or the bottom plate, and the collision monitoring component is communicatively connected to the battery management component.

6. The battery pack according to claim 1, wherein The heat source for the liquid cooling plate to be reset by heat when deformed includes: heating by the liquid inside the liquid cooling plate rising in temperature, or heating by an external heating component.

7. A repair method for a battery pack, characterized in that, The battery pack includes a liquid cooling plate and a bottom plate connected to each other. When the liquid cooling plate is deformed, it can be reset by heat. The repair method includes: Determining that the liquid cooling plate is deformed; Removing the bottom plate of the battery pack; Heating the deformed liquid cooling plate to reset the deformed part of the liquid cooling plate.

8. The repair method of the battery pack according to claim 7, characterized in that, The heating of the deformed liquid cooling plate includes: Controlling the temperature of the liquid inside the liquid cooling plate to a first preset temperature to perform a primary repair on the liquid cooling plate; Controlling the temperature of the liquid inside the liquid cooling plate to a second preset temperature to perform a secondary repair on the liquid cooling plate.

9. The repair method of the battery pack according to claim 7, wherein, The heating of the deformed liquid cooling plate includes: Determining the deformed part of the liquid cooling plate; Setting an external heating component at the deformed part to perform heating repair on the deformed part.

10. The repair method of the battery pack according to claim 7, wherein, The determining that the liquid cooling plate is deformed includes: Obtaining the parameters of the liquid at the outlet end of the liquid cooling plate; Based on the parameters exceeding the preset range, determining that the liquid cooling plate has local deformation.

11. The repair method of the battery pack according to claim 10, characterized in that, The determining that the liquid cooling plate is deformed further includes: Detecting whether the bottom plate is collided.

Images