A disassembly method for the top cover of a power battery

Abstract

The present invention relates to the technical field of power battery disassembly, and particularly relates to a method for disassembling the top cover of a power battery. An embodiment of the present invention provides a method for disassembling the top cover of a power battery, including: outputting a low-temperature fluid to the periphery of the top cover of the power battery by using a low-temperature nozzle; cutting along the top cover of the power battery by using a cutting member; removing the top cover of the power battery and performing low-temperature treatment on it; crushing the top cover of the power battery that has undergone low-temperature treatment; and obtaining metal materials and non-metal materials through screening. An embodiment of the present invention provides a method for disassembling the top cover of a power battery, which can disassemble the top cover of the power battery.

Description

Technical Field

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

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

[0003] With the use of power batteries, their performance will inevitably decrease, and thus they can no longer meet the power requirements of new energy vehicles, and new power batteries need to be replaced. However, some components in the old power batteries still have relatively high utilization value. For example, the anode material and other metal materials in the power batteries. Therefore, the materials with relatively high utilization value can be recycled by disassembling the waste batteries. Among them, the top cover of the power battery is the first and extremely important step in disassembly. Only after the top cover is disassembled can other internal materials be taken out and further disassembled. If the top cover is disassembled improperly, it may be 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 the top cover of a power battery, which can disassemble the top cover of the power battery.

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

[0006] Outputting low-temperature fluid to the periphery of the top cover of the power battery by using a low-temperature nozzle;

[0007] Cutting along the top cover of the power battery by using a cutting member;

[0008] Removing the top cover of the power battery and performing cryogenic treatment on it;

[0009] Crushing the top cover of the power battery that has undergone cryogenic treatment;

[0010] Obtaining metal materials and non-metal materials through screening.

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

[0012] Performing at least one heat treatment and cold treatment on the top cover of the power battery alternately.

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

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

[0015] Judge the area and position of the welding defects around the top cover of the power battery according to the waveform and amplitude of the echo;

[0016] The output of the cryogenic fluid to the periphery of the top cover of the power battery by using the cryogenic nozzle includes:

[0017] Taking the place with the largest defect area inside the welding joint around the top cover of the power battery as the starting point or the place with the largest defect area per unit length as the starting point, and outputting the cryogenic fluid along the periphery of the top cover of the power battery by using the cryogenic nozzle.

[0018] In a possible design, before outputting the cryogenic fluid to the periphery of the top cover of the power battery by using the cryogenic nozzle, it further includes:

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

[0020] Determine the planar position coordinates around the top cover of the power battery according to the position of each limiter;

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

[0022] The output of the cryogenic fluid to the periphery of the top cover of the power battery by using the cryogenic nozzle includes:

[0023] Use the robotic arm to carry the cryogenic nozzle to output the cryogenic fluid to the periphery of the top cover of the power battery according to the planar position coordinates and the height information.

[0024] In a possible design, before outputting the cryogenic fluid to the periphery of the top cover of the power battery by using the cryogenic nozzle, it further includes:

[0025] Output the cryogenic fluid to the liquid injection hole of the top cover of the power battery by using the cryogenic nozzle;

[0026] Use the cutting piece to break the weld at the liquid injection hole;

[0027] Discharge the electrolyte in the power battery in a vacuum environment.

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

[0029] The output of the cryogenic fluid to the periphery of the top cover of the power battery by using the cryogenic nozzle includes:

[0030] Output a sheet of low-temperature air flow using the low-temperature nozzle to make the top cover of the power battery lower than the preset temperature;

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

[0032] The cutting using the cutting member along the top cover of the power battery includes:

[0033] The cutting member is driven by the robotic arm to move above the part of the top cover of the power battery that is lower than the preset temperature;

[0034] Use the cutting member to lower and cut the part of the top cover of the power battery that is lower than the preset temperature;

[0035] After the cutting member cuts, it rises, waiting to cut after the uncut part of the top cover of the power battery drops below the preset temperature.

[0036] In a possible design, after outputting the sheet of low-temperature air flow using the low-temperature nozzle and before the robotic arm moves the low-temperature nozzle by a displacement equal to the length of the cutting member, it further includes:

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

[0038] In a possible design, the cutting member passes through an anti-freezing chamber, the anti-freezing chamber is filled with antifreeze, and the cutting member is hermetically and slidably connected to the upper and lower openings of the anti-freezing chamber;

[0039] The use of the cutting member to lower and cut the part of the top cover of the power battery that is lower than the preset temperature includes:

[0040] Use the cutting member to lower from the anti-freezing chamber to cut the part of the top cover of the power battery that is lower than the preset temperature;

[0041] The rising of the cutting member after cutting includes:

[0042] After the cutting member cuts, it rises into the anti-freezing chamber.

[0043] In a possible design, it further includes:

[0044] The robotic arm adjusts the angle so that the plane where the low-temperature nozzle and the cutting member are located forms an angle of 45° with both the top surface and the side surface of the power battery.

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

[0046] To facilitate the rapid removal of the top cover and prevent risks such as fire and explosion during the disassembly process, the present application abandons the method of mechanical disassembly after laser melting welds in the prior art. The present application adopts a method of disassembling the top cover of a power battery through a sharp cutting piece after low-temperature treatment. Specifically, first, a low-temperature fluid is sprayed by a low-temperature nozzle around the top cover of the power battery, causing the temperature of the welding positions around the top cover of the power battery to drop rapidly, reducing its toughness, so that when it is cut, it undergoes less deformation or brittle fractures directly without deformation. There are compositional differences between the welds around the top cover itself and the metal plates connected thereto. Under low-temperature treatment, it is more likely to be broken at the welds. After removing the top cover of the power battery, it is subjected to a crushing treatment, preferably crushing. The top cover consists of an insulating rubber material and a metal material. Since the two have different properties, the metal particles are finer after crushing, and the metal of the top cover can be separated by screening for reuse again. Description of the Drawings

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

[0050] Figure 3 is a partial structural schematic diagram of a method for disassembling the 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 piece;

[0055] 4 - Workbench;

[0056] 5 - Robot arm;

[0057] 6 - Limiting piece;

[0058] 7 - Slide rail;

[0059] 8 - Anti-freezing chamber. Detailed Embodiments

[0060] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0061] In the description of the embodiments of the present invention, unless otherwise clearly defined or limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plurality" means two or more; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" 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 those of ordinary skill in the art, 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 orientation terms such as "upper" and "lower" described in the embodiments of the present invention are described from the angles shown in the accompanying drawings and should not be construed 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 "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0063] As Figures 1 to 3 shown, the embodiments of the present invention provide a method for disassembling the top cover of a power battery, including:

[0064] Outputting a low-temperature fluid from a low-temperature nozzle 1 to the periphery of the top cover of the power battery 2;

[0065] Cutting along the top cover of the power battery 2 by a cutting member 3;

[0066] Removing the top cover of the power battery 2 and performing low-temperature treatment on it;

[0067] Crushing the top cover of the power battery 2 that has undergone low-temperature treatment;

[0068] Obtaining metal materials and non-metal materials through screening.

[0069] In this embodiment, in order to facilitate the quick removal of the top cover and prevent risks such as fire and explosion during the disassembly process, the present application abandons the mechanical disassembly method after laser melting welds in the prior art. The present application adopts a method of disassembling the top cover of the power battery 2 with a sharp cutting member 3 after low-temperature treatment. Specifically, first, a low-temperature fluid is sprayed from the low-temperature nozzle 1 around the top cover of the power battery 2, so that the temperature of the welding positions around the top cover of the power battery 2 drops suddenly, reducing its toughness, so that it undergoes less deformation or no deformation and directly brittle fractures when being cut. There are compositional differences between the welds around the top cover and the metal plates connected thereto. Under low-temperature treatment, it is easier to break at the welds. After removing the top cover of the power battery 2, it is subjected to a crushing treatment, preferably crushing. The top cover is composed of an insulating rubber material and a metal material. Since the two have different properties, the metal particles are finer after crushing, and the metal of the top cover can be separated by screening for reuse again.

[0070] In this embodiment, the low-temperature fluid may be a fluid such as liquid helium, liquid nitrogen, and liquid carbon dioxide.

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

[0072] Performing at least one heat treatment and cold treatment on the top cover of the power battery 2 alternately.

[0073] In this embodiment, the heat and cold alternating treatment can generate thermal stress at some joints of the top cover of the power battery 2, and internal defects or enlarged defects, such as defects generated during welding, which facilitates the removal of the top cover by subsequent low-temperature treatment and the cutting member 3.

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

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

[0076] 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 position around the top cover of the power battery 2;

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

[0078] Using the low-temperature nozzle 1 to output the low-temperature fluid around the top cover of the power battery 2 includes:

[0079] Starting from the location with the largest defect area inside the welded joints around the top cover of the power battery 2, or starting from the location with the largest defect area per unit length, use the low-temperature nozzle 1 to output low-temperature fluid along the periphery of the top cover of the power battery 2.

[0080] In this embodiment, first use ultrasonic pulse detection technology to detect the welds around the top cover of the power battery 2, and detect the location, type, and size of the defects existing in the welds. Parts with larger and denser defect areas are easily cut and separated. Therefore, determine the starting point for the cutting member 3 to cut according to the defect determination result, and use the cutting member 3 to pierce at the starting point to obtain a breakthrough. After obtaining the breakthrough, it is more conducive to the subsequent cutting of the cutting member 3.

[0081] In this embodiment, judging the defect area according to the waveform and amplitude of the ultrasonic echo is the prior art and will not be elaborated here.

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

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

[0084] Place the top cover of the power battery 2 facing up on the workbench 4, and use two pairs of limit members 6 that can slide on the slide rail 7 to fix the power battery 2 at the center of the workbench 4; wherein, the distance of each pair of limit members 6 from the center of the workbench 4 is the same during the sliding process;

[0085] Determine the planar position coordinates of the periphery of the top cover of the power battery 2 according to the position of each limit member 6;

[0086] Collect the height information of the periphery of the top cover of the power battery 2;

[0087] Using the low-temperature nozzle 1 to output low-temperature fluid to the periphery of the top cover of the power battery 2 includes:

[0088] Use the robotic arm 5 to carry the low-temperature nozzle 1 to output low-temperature fluid to the periphery of the top cover of the power battery 2 according to the planar position coordinates and height information.

[0089] In this embodiment, using two pairs of limit members 6 can fix the power battery 2 at the center position of the workbench 4. Then, according to the position of the limit members 6 on the slide rail 7, the power battery 2 is a columnar body with a rectangular bottom surface. Therefore, the length and width of the top cover and bottom surface of the power battery 2 can be judged. The height position of the power battery 2 can be collected by a vision sensor, a laser range finder, etc. Thus, the spatial coordinates of the power battery 2 can be obtained, facilitating the robotic arm 5 to accurately position the periphery of the top cover of the power battery 2.

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

[0091] In some embodiments of the present invention, before the cryogenic nozzle 1 outputs cryogenic fluid to the periphery of the top cover of the power battery 2, it further includes:

[0092] Outputting cryogenic fluid from the cryogenic nozzle 1 to the liquid injection hole of the top cover of the power battery 2;

[0093] Using the cutting member 3 to break the weld at the liquid injection hole;

[0094] Discharging the electrolyte in the power battery 2 in a vacuum environment.

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

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

[0097] Outputting cryogenic fluid from the cryogenic nozzle 1 to the periphery of the top cover of the power battery 2 includes:

[0098] Outputting a sheet-shaped cryogenic air flow from the cryogenic nozzle 1 to make the top cover of the power battery 2 lower than the preset temperature;

[0099] The robotic arm 5 moves a displacement equal to the length of the cryogenic nozzle 1 and the cutting member 3, and cools a 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 member 3 includes:

[0101] The cutting member 3 is moved by the robotic arm 5 to the upper part of the part of the top cover of the power battery 2 that is lower than the preset temperature;

[0102] Using the cutting member 3 to lower and cut the part of the top cover of the power battery 2 that is lower than the preset temperature;

[0103] After the cutting member 3 cuts, it rises, and waits to cut after the uncut part of the top cover of the power battery 2 drops below the preset temperature.

[0104] In this embodiment, both the cryogenic nozzle 1 and the cutting member 3 are sheet-shaped. First, the cryogenic nozzle 1 is used to cool the area to be cut so that it is lower than the preset temperature, then the robotic arm 5 is moved to make the cryogenic nozzle 1 move to the next area for cooling, and the cutting member 3 moves to the completed area for cutting; after the next area is cooled and the current area is cut, the robotic arm 5 continues to move to complete the cutting of the top cover. Among them, the distance that the robotic arm 5 moves is the length of the cutting member 3. With such a setting, the cutting member 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 the present application does not make specific limitations.

[0106] In some embodiments of the present invention, after the low-temperature nozzle 1 outputs a sheet-shaped low-temperature air flow and before the robotic arm 5 moves the low-temperature nozzle 1 by a displacement equal to the length of the cutting member 3, it further includes:

[0107] Using an infrared temperature measuring device 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.

[0108] In some embodiments of the present invention, the cutting member 3 passes through the antifreeze chamber 8, the antifreeze chamber 8 is filled with antifreeze, and the cutting member 3 is hermetically and slidably connected to the upper and lower openings of the antifreeze chamber 8;

[0109] Using the cutting member 3 to lower and cut the part of the top cover of the power battery 2 below the preset temperature includes:

[0110] Using the cutting member 3 to lower from the antifreeze chamber 8 to cut the part of the top cover of the power battery 2 below the preset temperature;

[0111] After the cutting member 3 cuts, it rises, including:

[0112] After the cutting member 3 cuts, it rises into the antifreeze chamber 8.

[0113] Since the low-temperature nozzle 1 is relatively close to the cutting member 3, long-term use will reduce the temperature of the cutting member 3, making it brittle and fragile. Therefore, an antifreeze chamber 8 is provided, and there is antifreeze in the antifreeze chamber 8. When not cutting, the cutting member 3 is displaced into the antifreeze chamber 8, and the temperature of the antifreeze is normal temperature to keep the cutting member 3 warm; when cutting, the cutting member 3 pops out of the antifreeze chamber 8, quickly pierces and retracts the part to be cut, so that the cutting member 3 is exposed to the outside for a short time, and after the cutting member 3 pops out, its surface is covered with antifreeze, which can further protect the cutting member 3. The pressure at the sliding and sealing connection of the cutting member 3 can be set to achieve both sealing the antifreeze to prevent its leakage and allowing a little antifreeze to cover the surface when the cutting member 3 pops out. Of course, in order to prevent the leakage of antifreeze, the antifreeze covering the cutting member 3 after popping out can also be abandoned, and the pressure at the sealing part can be increased. In addition, the way of ejecting and cutting can also increase the instantaneous passive deformation rate at the weld of the top cover, making the cutting edge at the cutting part regular.

[0114] In this embodiment, the antifreeze can be water, fats or lubricating oils, etc.

[0115] It should be noted that in order to prevent the leakage of antifreeze, the cutting member 3 cannot be completely retracted into the antifreeze chamber 8, and the contact length at the sealing connection between the antifreeze chamber 8 and the cutting member 3 can be increased, so that the cutting member 3 can both block the antifreeze chamber 8 and not be exposed to the outside.

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

[0117] The robotic arm 5 adjusts its angle so that the planes where the cryogenic nozzle 1 and the cutting member 3 are located form an angle of 45° with both the top surface and the side surface of the power battery 2.

[0118] In this embodiment, when the cutting member 3 pops out, the two components of its force respectively point to the top surface and the side surface of the power battery 2, which is equivalent to the force acting on the entire top surface and the side surface of the power battery 2 respectively, and will not cause deformation of the power battery 2, and the cut is more flat and 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, 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 make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for disassembling a top cover of a power battery, characterized in that: include: A cryogenic fluid is outputted to the periphery of a top cover of a power battery (2) using a cryogenic nozzle (1); wherein the cryogenic fluid is liquid helium, liquid nitrogen or liquid carbon dioxide; 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; Breaking the top cover of the power battery (2) that has been subjected to low temperature treatment; Metallic and non-metallic materials are obtained by screening; 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; 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 location of welding defects around the top cover of the power battery (2) based on the waveform and amplitude of the echo; The method of outputting low-temperature fluid to the periphery of the top cover of the power battery (2) using the low-temperature nozzle (1) comprises: Taking the point with the largest defect area in the weld 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 around the power battery (2).

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 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 low-temperature fluid to the periphery of the top cover of the power battery (2) using the 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.

3. 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 a low-temperature fluid to a liquid injection hole on a top cover of a 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.

4. The method for disassembling a 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 the form of sheets and are arranged at one end of the mechanical arm (5); The method of outputting low-temperature fluid to the periphery of the top cover of the power battery (2) using the low-temperature nozzle (1) comprises: Utilizing the low-temperature nozzle (1) 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 the cutting piece (3), thereby cooling 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.

5. A method for disassembling a top cover of a power battery according to claim 4, 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 piece (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.

6. A method for disassembling a top cover of a power battery according to claim 4, 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 sealingly and slidably connected to the upper and lower openings of the antifreeze bin (8); The method of utilizing 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.

7. The method for disassembling the top cover of a power battery according to claim 4, 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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