Disassembling method of power battery top cover

Abstract

The invention relates to the technical field of power battery disassembly, in particular to a method for disassembling a top cover of a power battery. The embodiment of the invention provides a method for disassembling a top cover of a power battery. The method comprises the following steps: outputting low-temperature fluid to the periphery of the top cover of the power battery by utilizing a low-temperature nozzle; cutting along the top cover of the power battery by using a cutting piece; taking down the top cover of the power battery, and performing low-temperature treatment on the top cover; crushing the top cover of the power battery subjected to low-temperature treatment; and a metal material and a non-metal material are obtained through screening. The embodiment of the invention provides a method for disassembling a top cover of a power battery. The method can be used for disassembling the top cover of the power battery.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery disassembly, and in particular to a method for disassembling a power battery top cover. Background Art

[0002] Power batteries are the source of driving power for new energy vehicles and have high energy density and strong power output.

[0003] As power batteries are used, their performance will inevitably decrease, and they will no longer be able to meet the power requirements of new energy vehicles, and new power batteries will need to be replaced. However, some components in old power batteries still have high utilization value, such as anode materials and other metal materials in power batteries. Therefore, materials with high utilization value can be recycled by disassembling waste batteries. Among them, the top cover of the power battery is the first step in disassembly, and it is also an extremely important step. Only after the top cover is disassembled can other materials inside be taken out and further disassembled. If the top cover is disassembled improperly, it may make it difficult to separate useful materials from waste materials in subsequent steps. Summary of the invention

[0004] An embodiment of the present invention provides a method for disassembling a top cover of a power battery, which can disassemble the top cover of a power battery.

[0005] An embodiment of the present invention provides a method for disassembling a top cover of a power battery, comprising:

[0006] Use a low-temperature nozzle to output low-temperature fluid to the periphery of the power battery top cover;

[0007] Using a cutting piece to cut along the top cover of the power battery;

[0008] Removing the top cover of the power battery and subjecting it to low temperature treatment;

[0009] Breaking the top cover of the power battery that has been subjected to low temperature treatment;

[0010] Metallic materials and non-metallic materials are obtained by screening.

[0011] In a possible design, before using the low-temperature nozzle to output the low-temperature fluid to the periphery of the power battery top cover, it also includes:

[0012] The power battery top cover is subjected to at least one heat treatment and one cold treatment alternately.

[0013] In a possible design, before using the low-temperature nozzle to output the low-temperature fluid to the periphery of the power battery top cover, it also includes:

[0014] Performing ultrasonic pulse detection around the top cover of the power battery to obtain the waveform and amplitude of the echo corresponding to the positions around the top cover of the power battery;

[0015] Determine the area and location of welding defects around the power battery top cover based on the waveform and amplitude of the echo;

[0016] The method of outputting the low-temperature fluid to the periphery of the power battery top cover by using the low-temperature nozzle comprises:

[0017] Taking the point with the largest defect area in the welding part around the power battery top cover as the starting point or the point with the largest defect area per unit length as the starting point, a low-temperature nozzle is used to output low-temperature fluid around the power battery top cover.

[0018] In a possible design, before using the low-temperature nozzle to output the low-temperature fluid to the periphery of the power battery top cover, it also includes:

[0019] Place the power battery cover upward on a workbench, and fix the power battery at the center of the workbench using two pairs of stoppers that can slide on the slide rails; wherein each pair of stoppers is at the same distance from the center of the workbench during the sliding process;

[0020] Determining the plane position coordinates of the periphery of the power battery top cover according to the position of each of the stoppers;

[0021] Collecting height information around the power battery top cover;

[0022] The method of outputting the low-temperature fluid to the periphery of the power battery top cover by using the low-temperature nozzle comprises:

[0023] A low-temperature nozzle is mounted on a robotic arm to output low-temperature fluid around the power battery top cover according to the plane position coordinates and the height information.

[0024] In a possible design, before using the low-temperature nozzle to output the low-temperature fluid to the periphery of the power battery top cover, the method further includes:

[0025] Using a low-temperature nozzle to output low-temperature fluid to the injection hole of the top cover of the power battery;

[0026] Destroying the weld at the injection hole by using a cutting piece;

[0027] The electrolyte in the power battery is discharged under a vacuum environment.

[0028] In a possible design, the cryogenic nozzle and the cutting piece are both in sheet form and are disposed at one end of the robotic arm;

[0029] The method of outputting the low-temperature fluid to the periphery of the power battery top cover by using the low-temperature nozzle comprises:

[0030] The low-temperature nozzle is used to output a sheet-shaped low-temperature airflow to make the power battery top cover lower than a preset temperature;

[0031] The robot arm moves the low-temperature nozzle to a displacement equal to the length of the cutting piece, and cools down the local position of the power battery top cover again;

[0032] The method of cutting along the top cover of the power battery by using a cutting member comprises:

[0033] The cutting member is driven by the mechanical arm to move above the portion of the power battery top cover which is lower than a preset temperature;

[0034] Using the cutting piece to descend and cut the power battery top cover portion below the preset temperature;

[0035] The cutting member rises after cutting, and waits for the uncut power battery top cover to drop below the preset temperature before cutting.

[0036] In a possible design, after the low-temperature nozzle is used to output the sheet-shaped low-temperature airflow and before the robot arm moves the low-temperature nozzle to a displacement equal to the length of the cutting piece, the method further includes:

[0037] An infrared temperature measuring device is used to determine whether the power battery top cover at the bottom of the low-temperature nozzle is lower than the preset temperature.

[0038] In a possible design, the cutting piece is inserted into an antifreeze bin, the antifreeze bin contains antifreeze liquid, and the cutting piece is sealed and slidably connected to the upper and lower openings of the antifreeze bin;

[0039] The method of using the cutting member to descend and cut the power battery top cover portion below the preset temperature includes:

[0040] Using the cutting piece to descend from the antifreeze compartment and cut the top cover portion of the power battery that is below the preset temperature;

[0041] The cutting member rises after cutting, and comprises:

[0042] The cutting piece is lifted into the antifreeze bin after cutting.

[0043] In one possible design, it also includes:

[0044] The robot arm adjusts its angle so that the included angles between the plane where the low-temperature nozzle and the cutting piece are located and the top surface and the side surface of the power battery are all 45°.

[0045] Compared with the prior art, the present invention has at least the following beneficial effects:

[0046] In order to facilitate the rapid removal of the top cover and to prevent the risk of fire and explosion during the disassembly process, the present application abandons the mechanical disassembly method after laser melting the weld in the prior art. The present application adopts a method of disassembling the top cover of the power battery by using a sharp cutting piece after low-temperature treatment. Specifically, a low-temperature nozzle is first used to spray a low-temperature fluid around the top cover of the power battery, so that the temperature of the welding position around the top cover of the power battery drops sharply, reducing its toughness, so that it undergoes a small deformation when cut or directly brittle fracture without deformation. There is a composition difference between the welds around the top cover and the metal plates connected to it, which makes it easier to break at the welds under low-temperature treatment. After removing the top cover of the power battery, it is crushed, preferably crushed. The composition of the top cover includes insulating rubber material and metal material. Due to the different properties of the two, the metal particles are finer after crushing. The metal of the top cover can be separated by screening for reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 It is a flow chart of a method for disassembling a top cover of a power battery provided by an embodiment of the present invention;

[0049] Figure 2 It is a structural schematic diagram of a method for disassembling a top cover of a power battery provided by an embodiment of the present invention;

[0050] Figure 3 It is a partial structural schematic diagram of a method for disassembling a top cover of a power battery according to an embodiment of the present invention.

[0051] In the figure:

[0052] 1- Low temperature nozzle;

[0053] 2- Power battery;

[0054] 3- Cutting pieces;

[0055] 4- Workbench;

[0056] 5-Robotic arm;

[0057] 6-Limiting parts;

[0058] 7- Slide rail;

[0059] 8- Antifreeze chamber. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0061] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0063] like Figures 1 to 3 As shown, an embodiment of the present invention provides a method for disassembling a top cover of a power battery, comprising:

[0064] Use the low-temperature nozzle 1 to output the low-temperature fluid to the periphery of the top cover of the power battery 2;

[0065] Using the cutting piece 3 to cut along the top cover of the power battery 2;

[0066] Remove the top cover of the power battery 2 and perform low temperature treatment on it;

[0067] Breaking the top cover of the power battery 2 that has been subjected to low temperature treatment;

[0068] Metallic materials and non-metallic materials are obtained by screening.

[0069] In this embodiment, in order to facilitate the rapid removal of the top cover and to prevent the risk of fire and explosion during the disassembly process, the present application abandons the method of mechanical disassembly after laser melting the weld in the prior art. The present application adopts a method of disassembling the top cover of the power battery 2 by a sharp cutting piece 3 after low temperature treatment. Specifically, a low temperature nozzle 1 is first used to spray a low temperature fluid around the top cover of the power battery 2, so that the temperature of the welding position around the top cover of the power battery 2 drops sharply, reducing its toughness, so that it undergoes a small deformation when cut or directly brittle fracture without deformation. There is a difference in composition between the weld around the top cover and the metal plate connected to it, which makes it easier to break at the weld under low temperature treatment. After removing the top cover of the power battery 2, it is crushed, preferably crushed. The composition of the top cover includes insulating rubber material and metal material. Due to the different properties of the two, the metal particles are finer after crushing. The metal of the top cover can be separated by screening to prepare for its reuse.

[0070] In this embodiment, the cryogenic fluid may be liquid helium, liquid nitrogen, liquid carbon dioxide or the like.

[0071] In some embodiments of the present invention, before using the low-temperature nozzle 1 to output the low-temperature fluid to the periphery of the top cover of the power battery 2, the method further includes:

[0072] The top cover of the power battery 2 is subjected to at least one heat treatment and one cold treatment alternately.

[0073] In this embodiment, the alternating hot and cold treatment can cause thermal stress to be generated at some joints of the top cover of the power battery 2, resulting in internal defects or enlarged defects, such as defects generated during welding, so as to facilitate the removal of the top cover by low temperature treatment and cutting piece 3 later.

[0074] In this embodiment, the heat treatment may be a hot air treatment, the cold treatment may be a low temperature fluid treatment, the treatment temperature of the heat treatment may be 50 to 80°C, and the temperature of the cold treatment may be -10 to 0°C.

[0075] In some embodiments of the present invention, before using the low-temperature nozzle 1 to output the low-temperature fluid to the periphery of the top cover of the power battery 2, the method further includes:

[0076] Perform ultrasonic pulse detection around the top cover of the power battery 2 to obtain the waveform and amplitude of the echo corresponding to the positions around the top cover of the power battery 2;

[0077] Determine the area and location of the welding defects around the top cover of the power battery 2 according to the waveform and amplitude of the echo;

[0078] The low-temperature fluid is output to the periphery of the top cover of the power battery 2 by using the low-temperature nozzle 1, including:

[0079] Taking the point with the largest defect area in the welding part around the top cover of the power battery 2 as the starting point or the point with the largest defect area per unit length as the starting point, the low-temperature nozzle 1 is used to output the low-temperature fluid around the top cover of the power battery 2 .

[0080] In this embodiment, ultrasonic pulse detection technology is first used to detect the welds around the top cover of the power battery 2 to detect the location, type and size of the defects in the welds. The parts with larger and denser defects are easy to be cut and separated. Therefore, the starting point of the cutting of the cutting piece 3 is determined according to the defect determination result, and the cutting piece 3 is used to puncture at the starting point to obtain a breakthrough. After the breakthrough is obtained, it is more conducive to the subsequent cutting of the cutting piece 3.

[0081] In this embodiment, judging the defect area based on the waveform and amplitude of the ultrasonic echo is a prior art and will not be described in detail here.

[0082] It should be noted that a defect density threshold can be set to determine whether to use the point with the maximum defect density as the starting point. If the defect density per unit length is lower than the defect density threshold, the point with the maximum defect area is selected as the starting point.

[0083] In some embodiments of the present invention, before using the low-temperature nozzle 1 to output the low-temperature fluid to the periphery of the top cover of the power battery 2, the method further includes:

[0084] Place the power battery 2 with the top cover facing upward on the workbench 4, and fix the power battery 2 at the center of the workbench 4 using two pairs of stoppers 6 that can slide on the slide rails 7; wherein each pair of stoppers 6 has the same distance from the center of the workbench 4 during the sliding process;

[0085] According to the position of each stopper 6, the plane position coordinates around the top cover of the power battery 2 are determined;

[0086] Collecting height information around the top cover of the power battery 2;

[0087] The low-temperature fluid is output to the periphery of the top cover of the power battery 2 by using the low-temperature nozzle 1, including:

[0088] The low-temperature nozzle 1 is carried by the robot arm 5 to output low-temperature fluid around the top cover of the power battery 2 according to the plane position coordinates and height information.

[0089] In this embodiment, two pairs of stoppers 6 are used to fix the power battery 2 at the center of the workbench 4. Then, according to the position of the stoppers 6 on the slide rail 7, the power battery 2 is a column with a rectangular bottom surface. Therefore, the length and width of the top cover and bottom surface of the power battery 2 can be determined. The height position of the power battery 2 can be collected by a visual sensor and a laser ranging sensor, thereby obtaining the spatial coordinates of the power battery 2, which facilitates the robot arm 5 to accurately locate the top cover of the power battery 2.

[0090] In addition, a high-precision visual sensor may be mounted on the robotic arm 5 to identify and locate the power battery 2 .

[0091] In some embodiments of the present invention, before using the low-temperature nozzle 1 to output the low-temperature fluid to the periphery of the top cover of the power battery 2, it also includes:

[0092] The low-temperature nozzle 1 is used to output the low-temperature fluid to the injection hole of the top cover of the power battery 2;

[0093] Use the cutting piece 3 to break the weld at the injection hole;

[0094] The electrolyte in the power battery 2 is discharged under a vacuum environment.

[0095] In this embodiment, the injection hole of the top cover of the power battery 2 is welded and sealed, which can be broken first to discharge the electrolyte for the subsequent disassembly steps.

[0096] In some embodiments of the present invention, the cryogenic nozzle 1 and the cutting member 3 are both in sheet form and are disposed at one end of the robotic arm 5;

[0097] The low-temperature fluid is output to the periphery of the top cover of the power battery 2 by using the low-temperature nozzle 1, including:

[0098] The low-temperature nozzle 1 is used to output a sheet-shaped low-temperature airflow to make the top cover of the power battery 2 lower than a preset temperature;

[0099] The robot arm 5 moves the low-temperature nozzle 1 by a displacement equal to the length of the cutting piece 3, and cools down the local position of the top cover of the power battery 2 again;

[0100] Cutting along the top cover of the power battery 2 using the cutting piece 3 includes:

[0101] The cutting member 3 is driven by the mechanical arm 5 to move above the portion of the top cover of the power battery 2 which is lower than the preset temperature;

[0102] Using the cutting piece 3 to descend and cut the top cover portion of the power battery 2 which is below a preset temperature;

[0103] The cutting piece 3 rises after cutting, and waits for the top cover of the power battery 2 that has not been cut to drop below a preset temperature before cutting.

[0104] In this embodiment, the low-temperature nozzle 1 and the cutting piece 3 are both in the form of sheets. The low-temperature nozzle 1 is first used to cool the area to be cut to a temperature lower than the preset temperature, and then the mechanical arm 5 is moved to move the low-temperature nozzle 1 to the next area for cooling, and the cutting piece 3 is moved to the completed area for cutting; after the next area is cooled and the current area is cut, the mechanical arm 5 continues to move to complete the top cover cutting. The distance that the mechanical arm 5 moves is the length of the cutting piece 3. With this arrangement, the cutting piece 3 can completely cut the edge of the top cover of the power battery 2.

[0105] It should be noted that the preset temperature can be determined according to the material of the weld and empirical values, for example, it can be -180 to -50°C, and this application does not make any specific limitation.

[0106] In some embodiments of the present invention, after the cryogenic nozzle 1 outputs the sheet-shaped cryogenic airflow and before the robot arm 5 moves the cryogenic nozzle 1 to a displacement having the same length as the cutting member 3, the method further includes:

[0107] An infrared temperature measuring device is used to determine whether the top cover of the power battery 2 at the bottom of the low-temperature nozzle 1 is lower than a preset temperature.

[0108] In some embodiments of the present invention, the cutting member 3 is inserted into the antifreeze chamber 8, the antifreeze chamber 8 contains antifreeze liquid, and the cutting member 3 is sealed and slidably connected to the upper and lower openings of the antifreeze chamber 8;

[0109] The cutting member 3 is used to descend and cut the top cover portion of the power battery 2 which is below a preset temperature, including:

[0110] The cutting member 3 is lowered from the antifreeze chamber 8 to cut the top cover portion of the power battery 2 which is below the preset temperature;

[0111] The cutting member 3 rises after cutting, and comprises:

[0112] The cutting piece 3 is lifted into the antifreeze bin 8 after cutting.

[0113] Since the low-temperature nozzle 1 is close to the cutting piece 3, long-term use will reduce the temperature of the cutting piece 3, causing it to become brittle and fragile. Therefore, an antifreeze bin 8 is set, and there is antifreeze in the antifreeze bin 8. When not cutting, the cutting piece 3 is displaced into the antifreeze bin 8, and the temperature of the antifreeze is room temperature, so that the cutting piece 3 is kept warm; when cutting, the cutting piece 3 pops out of the antifreeze bin 8, quickly pierces and retracts the part to be cut, so that the cutting piece 3 is exposed to the outside world for a short time, and the surface of the cutting piece 3 is covered with antifreeze after it pops out, which can further protect the cutting piece 3. The pressure at the sliding sealing connection of the cutting piece 3 can be set to achieve both sealing the antifreeze to prevent leakage and allowing the surface of the cutting piece 3 to be covered with a small amount of antifreeze when it pops out. Of course, in order to prevent the leakage of antifreeze, it is also possible to abandon the covering of the cutting piece 3 with antifreeze after it pops out, and increase the pressure at the sealing. In addition, the ejection cutting method can also increase the instantaneous passive deformation rate at the weld of the top cover, so that the cutting edge at the cutting position is regular.

[0114] In this embodiment, the antifreeze liquid can be water, fat or lubricating oil, etc.

[0115] It should be noted that in order to prevent leakage of antifreeze liquid, the cutting piece 3 cannot be completely retracted into the antifreeze bin 8. The contact length of the sealed connection between the antifreeze bin 8 and the cutting piece 3 can be increased so that the cutting piece 3 can seal the antifreeze bin 8 without being exposed to the outside.

[0116] In some embodiments of the present invention, it further comprises:

[0117] The robot arm 5 adjusts the angle so that the included angles between the plane where the low-temperature nozzle 1 and the cutting piece 3 are located and the top surface and the side surface of the power battery 2 are all 45°.

[0118] In this embodiment, when the cutting piece 3 pops out, the two components of its force are directed to the top surface and the side surface of the power battery 2 respectively, which is equivalent to the force acting on the entire top surface and the side surface of the power battery 2 respectively, which will not cause deformation of the power battery 2 and the incision will be smoother and more stable.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for disassembling a top cover of a power battery, characterized in that: include: Using a low-temperature nozzle (1) to output low-temperature fluid to the periphery of the top cover of the power battery (2); Using a cutting piece (3) to cut along the top cover of the power battery (2); removing the top cover of the power battery (2) and subjecting it to low-temperature treatment; crushing the top cover of the power battery (2) that has been subjected to low temperature treatment; Metallic materials and non-metallic materials are obtained by screening.

2. A method for disassembling a top cover of a power battery according to claim 1, characterized in that: Before using the low-temperature nozzle (1) to output the low-temperature fluid to the periphery of the top cover of the power battery (2), the method further comprises: The top cover of the power battery (2) is subjected to at least one heat treatment and one cold treatment alternately.

3. A method for disassembling a top cover of a power battery according to claim 1 or 2, characterized in that: Before using the low-temperature nozzle (1) to output the low-temperature fluid to the periphery of the top cover of the power battery (2), the method further comprises: Performing ultrasonic pulse detection around the top cover of the power battery (2) to obtain the waveform and amplitude of the echo corresponding to the positions around the top cover of the power battery (2); Determine the area and position of welding defects around the top cover of the power battery (2) according to the waveform and amplitude of the echo; The method of outputting a low-temperature fluid to the periphery of a top cover of a power battery (2) using a low-temperature nozzle (1) comprises: Taking the point with the largest defect area in the welding part around the top cover of the power battery (2) as the starting point or the point with the largest defect area per unit length as the starting point, a low-temperature nozzle (1) is used to output low-temperature fluid along the top cover of the power battery (2).

4. The method for disassembling a top cover of a power battery according to claim 1, characterized in that: Before using the low-temperature nozzle (1) to output the low-temperature fluid to the periphery of the top cover of the power battery (2), the method further comprises: The power battery (2) is placed on a workbench (4) with its top cover facing upward, and the power battery (2) is fixed at the center of the workbench (4) using two pairs of stoppers (6) that can slide on slide rails (7); wherein each pair of stoppers (6) is at the same distance from the center of the workbench (4) during the sliding process; Determining the plane position coordinates of the periphery of the top cover of the power battery (2) according to the position of each of the limiting members (6); Collecting height information around the top cover of the power battery (2); The method of outputting a low-temperature fluid to the periphery of a top cover of a power battery (2) using a low-temperature nozzle (1) comprises: A low-temperature nozzle (1) is mounted on a mechanical arm (5) to output low-temperature fluid around the top cover of the power battery (2) according to the plane position coordinates and the height information.

5. The method for disassembling the top cover of a power battery according to claim 1, characterized in that: The method of using the low-temperature nozzle (1) to output the low-temperature fluid to the periphery of the top cover of the power battery (2) also includes: Using a low-temperature nozzle (1) to output low-temperature fluid to the injection hole of the top cover of the power battery (2); Using a cutting piece (3) to break the weld at the injection hole; The electrolyte in the power battery (2) is discharged under a vacuum environment.

6. The method for disassembling the top cover of a power battery according to claim 1, characterized in that: The low-temperature nozzle (1) and the cutting piece (3) are both in sheet form and are arranged at one end of the mechanical arm (5); The method of outputting a low-temperature fluid to the periphery of a top cover of a power battery (2) using a low-temperature nozzle (1) comprises: The low-temperature nozzle (1) is used to output a sheet-shaped low-temperature airflow, so that the top cover of the power battery (2) is lower than a preset temperature; The mechanical arm (5) moves the low-temperature nozzle (1) by a displacement having the same length as that of the cutting piece (3), and cools down a local position of the top cover of the power battery (2) again; The method of cutting along the top cover of the power battery (2) using a cutting piece (3) comprises: The cutting member (3) is driven by the mechanical arm (5) to move above a portion of the top cover of the power battery (2) that is lower than a preset temperature; Using the cutting piece (3) to descend and cut the top cover portion of the power battery (2) that is below the preset temperature; The cutting member (3) rises after cutting, waiting for the top cover of the power battery (2) that has not been cut to drop below the preset temperature before cutting.

7. A method for disassembling a top cover of a power battery according to claim 6, characterized in that: After the low-temperature nozzle (1) is used to output a sheet-shaped low-temperature airflow and before the mechanical arm (5) moves the low-temperature nozzle (1) to a displacement having the same length as the cutting member (3), the method further comprises: An infrared temperature measuring device is used to determine whether the top cover of the power battery (2) at the bottom of the low-temperature nozzle (1) is lower than the preset temperature.

8. The method for disassembling the top cover of a power battery according to claim 6, characterized in that: The cutting piece (3) is inserted into the antifreeze bin (8), the antifreeze bin (8) contains antifreeze liquid, and the cutting piece (3) is sealed and slidably connected to the upper and lower openings of the antifreeze bin (8); The method of using the cutting member (3) to descend and cut the top cover portion of the power battery (2) which is below the preset temperature comprises: The cutting piece (3) is lowered from the antifreeze chamber (8) to cut the top cover portion of the power battery (2) which is below the preset temperature; The cutting member (3) rises after cutting, and comprises: The cutting piece (3) is lifted into the antifreeze bin (8) after cutting.

9. The method for disassembling the top cover of a power battery according to claim 6, characterized in that: Also includes: The mechanical arm (5) adjusts its angle so that the included angles between the plane where the low-temperature nozzle (1) and the cutting piece (3) are located and the top surface and the side surface of the power battery (2) are all 45 degrees.

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