Used power battery cells and their dismantling methods

Abstract

This application provides a waste power battery cell and its dismantling method. The dismantling method includes: fixing the waste power battery cell; circumferentially cutting the metal casing of the waste power battery cell to form a surface defect area on the metal casing, with surface defect annular grooves of a predetermined depth formed on both sides of the surface defect area; the predetermined depth being less than the thickness of the metal casing; performing an edge-lifting operation on the surface defect area to form a warped structure at the surface defect area of ​​the metal casing; tearing the warped structure to separate the surface defect area from the metal casing; and removing the tabs and electrode rolls of the waste power battery cell. The above-mentioned dismantling method avoids the problem of short circuits in the internal structure of the waste power battery cell, thereby avoiding the problems of fire, explosion, or combustion and exhaust gas generation during battery dismantling, improving the safety and environmental friendliness of battery dismantling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery recycling, and in particular to a waste power battery monomer and a disassembling method thereof. BACKGROUND

[0002] The disassembly of a lithium battery power battery monomer is generally directly broken under the protection of water, nitrogen and the like, and there is direct cutting with a cutter. In the disassembly process, there is a situation of internal short-circuit heat release of the battery, causing fire explosion or combustion to produce waste gas, and further causing the risks of safety and environmental pollution in disassembly. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art, and provides a waste power battery monomer and a disassembling method thereof, which avoid the situation of internal short-circuit heat release of the battery, metal friction heat generation, fire explosion or combustion to produce waste gas.

[0004] The present application is achieved by the following technical solutions:

[0005] A disassembling method of a waste power battery monomer, comprising:

[0006] fixing the waste power battery monomer;

[0007] circumferentially cutting a metal shell of the waste power battery monomer to form a surface defect area on the metal shell of the waste power battery monomer, both sides of the surface defect area being formed with a surface defect ring groove with a predetermined depth; the predetermined depth being less than the thickness of the metal shell;

[0008] performing an edge starting operation on the surface defect area to form a warping structure at the surface defect area of the metal shell;

[0009] performing a tearing operation on the warping structure to tear the surface defect area from the metal shell;

[0010] taking out the tab and the jelly roll of the waste power battery monomer.

[0011] In one embodiment, the step of fixing the waste power battery monomer is specifically:

[0012] the waste power battery monomer is fixed by a fixing clamp.

[0013] In one embodiment, the step of circumferentially cutting the metal shell of the waste power battery monomer is specifically:

[0014] the tab end of the metal shell of the waste power battery monomer is circumferentially cut by a circumferential cutting tool.

[0015] In one of the embodiments, the ring cutter comprises a ring cutter holder, a first cutter blade and a second cutter blade, the first cutter blade and the second cutter blade are arranged on the ring cutter holder, and the first cutter blade and the second cutter blade have a preset interval.

[0016] In one of the embodiments, the preset interval is 5mm-20mm.

[0017] In one of the embodiments, the predetermined depth is 0.4-0.6 times of the thickness of the metal shell.

[0018] In one of the embodiments, the step of performing the edge lifting operation on the surface defect area is specifically:

[0019] In one of the embodiments, the step of performing the beveling operation on the surface defect area is specifically:

[0020] In one of the embodiments, the step of performing the beveling operation on the surface defect area is specifically:

[0021] In one of the embodiments, the step of performing the beveling operation on the surface defect area is specifically:

[0022] In one of the embodiments, the step of performing the tearing operation on the warped structure is specifically:

[0023] In one of the embodiments, the step of performing the tearing operation on the warped structure is specifically:

[0024] An old power battery monomer is disassembled by using the disassembling method of the old power battery monomer according to any one of the above embodiments.

[0025] Compared with the prior art, the present application has at least the following advantages:

[0026] 1. The disassembling method of the old power battery monomer is first fixed; then the metal shell of the old power battery monomer is ring cut to form a surface defect area on the metal shell of the old power battery monomer, and both sides of the surface defect area are formed with a surface defect ring groove with a predetermined depth, and since the predetermined depth is less than the thickness of the metal shell, the metal shell is not pierced when the metal shell is ring cut, so as to avoid the problem of damaging the internal structure of the battery during the ring cutting process and causing short circuit; then the edge lifting operation is performed on the surface defect area to form a warped structure at the surface defect area of the metal shell; then the tearing operation is performed on the warped structure to tear the surface defect area from the metal shell, and finally the tab and the pole are taken out, so as to complete the disassembly of the old power battery monomer.

[0027] 2. Because the above-mentioned dismantling method for waste power battery cells avoids the problem of short circuits in the internal structure of the waste power battery cells during dismantling, it avoids the situation of internal short circuits and heat release in the battery cells during dismantling, thereby avoiding the problem of fire, explosion or combustion and exhaust gas generation during battery dismantling, thus improving the safety and environmental protection of battery dismantling. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A flowchart illustrating a method for dismantling a single waste power battery cell, as described in one embodiment;

[0030] Figure 2 for Figure 1 The diagram shows the operation of step S103 in the dismantling method of the waste power battery cell.

[0031] Figure 3 for Figure 1 A schematic diagram of step S105 of the dismantling method for waste power battery cells shown.

[0032] Figure 4 for Figure 1 A schematic diagram of step S107 of the dismantling method for waste power battery cells shown;

[0033] Figure 5 for Figure 2 A schematic diagram of the structure of the circumferential cutting limiting tool used in step S103 of the dismantling method for waste power battery cells shown.

[0034] Figure 6 for Figure 5 The diagram shows a structural schematic of the circumferential cutting limiting tool from another perspective. Detailed Implementation

[0035] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0036] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely used for the purpose of illustration and are not intended to be limiting.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] The application provides a method for disassembling a waste power battery cell, comprising: fixing the waste power battery cell; and / or cutting around the metal shell of the waste power battery cell to form a surface defect area on the metal shell of the waste power battery cell, both sides of the surface defect area being formed with a surface defect ring groove with a predetermined depth; and / or the predetermined depth being less than the thickness of the metal shell; and / or performing an edge lifting operation on the surface defect area to form a buckling structure at the surface defect area of the metal shell; and / or performing a tearing operation on the buckling structure to tear the surface defect area from the metal shell; and / or taking out the tab and the jellyroll of the waste power battery cell.

[0039] The method for disassembling a waste power battery cell described above first fixes the waste power battery cell; then cuts around the metal shell of the waste power battery cell to form a surface defect area on the metal shell of the waste power battery cell, both sides of the surface defect area being formed with a surface defect ring groove with a predetermined depth, so that the cutting around the metal shell does not pierce the metal shell, thereby avoiding the problem of damaging the internal structure of the battery during the cutting process and causing short circuit; then performs an edge lifting operation on the surface defect area to form a buckling structure at the surface defect area of the metal shell; then performs a tearing operation on the buckling structure to tear the surface defect area from the metal shell, and finally takes out the tab and the jellyroll of the waste power battery cell, thereby completing the disassembly of the waste power battery cell. The method for disassembling a waste power battery cell described above avoids the problem of short circuit in the internal structure of the waste power battery cell during disassembly, avoids the situation of internal short circuit and heat release of the battery cell during the disassembly process, and further avoids the problems of fire, explosion or combustion of waste gas during the disassembly process of the battery, thereby improving the safety and environmental protection of the disassembly of the battery.

[0040] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments:

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the dismantling method for a waste power battery cell 10 is used to dismantle the waste power battery cell 10. In this embodiment, the dismantling method for the waste power battery cell 10 is used to dismantle a square waste power battery cell 10. Further, the dismantling method for the waste power battery cell 10 includes some or all of the following steps:

[0042] S101, to fix the waste power battery cells.

[0043] like Figure 2 As shown, in this embodiment, the waste power battery cell 10 is fixed so that subsequent operations such as ring cutting of the waste power battery cell 10 can be reliably performed, thereby improving the accuracy and efficiency of dismantling the waste power battery cell 10.

[0044] S103, the metal casing of the waste power battery cell is circumferentially cut to form a surface defect area on the metal casing of the waste power battery cell.

[0045] like Figure 2 As shown, in this embodiment, the metal casing 100 of the waste power battery cell 10 is circumferentially cut to form a surface defect area 110 on the metal casing 100. A surface defect annular groove 112 of a predetermined depth is formed on both sides of the surface defect area 110. The predetermined depth is less than the thickness of the metal casing 100, so that the metal casing 100 is not punctured during circumferential cutting, thus avoiding damage to the internal structure of the battery and causing a short circuit. This avoids the possibility of internal short circuits and heat release during battery disassembly, thereby preventing fires, explosions, or combustion that could generate exhaust gases during battery disassembly, and improving the safety and environmental friendliness of battery disassembly.

[0046] S105, perform an edge-raising operation on the surface defect area to form a warped structure at the surface defect area of ​​the metal shell.

[0047] like Figure 3 As shown, in this embodiment, an edge-lifting operation is performed on the surface defect area 110 to form a warped structure 114 at the surface defect area 110 of the metal shell 100, so that a tearing operation can be performed subsequently.

[0048] S107, perform a tearing operation on the warped structure to tear the surface defect area from the metal shell.

[0049] likeFigure 4 As shown, in this embodiment, the warped structure 114 is torn open, so that the surface defect area 110 is torn open from the metal casing 100. Even if the metal casing 100 is torn along the surface defect area 110, a tear is formed on the surface of the metal casing 100 so that the tabs and electrode rolls of the waste power battery cell 10 can be removed later.

[0050] S109, Remove the tabs and electrode rolls from the waste power battery cell.

[0051] In this embodiment, the tabs and electrode rolls of the waste power battery cell 10 are removed, that is, the electrode rolls of the waste power battery cell 10 along with the tabs are removed from the metal casing 100.

[0052] The above-described method for dismantling used power battery cells 10 involves first fixing the used power battery cells 10; then, circumferentially cutting the metal casing 100 of the used power battery cells 10 to form a surface defect area 110 on the metal casing 100. Surface defect annular grooves 112 of a predetermined depth are formed on both sides of the surface defect area 110. Since the predetermined depth is less than the thickness of the metal casing 100, circumferential cutting of the metal casing 100 will not puncture the metal casing 100, thus preventing damage to the internal structure of the battery and potential short circuits during the circumferential cutting process; then, an edge-lifting operation is performed on the surface defect area 110 to allow the metal casing 100 to be lifted. A warped structure 114 is formed at the surface defect area 110 of the 00; then the warped structure 114 is torn open, so that the surface defect area 110 is torn apart from the metal casing 100. Finally, the tabs and electrode rolls of the waste power battery cell 10 are removed, thus completing the dismantling of the waste power battery cell 10. Since the above-mentioned dismantling method of the waste power battery cell 10 avoids the problem of short circuit in the internal structure of the waste power battery cell 10 during dismantling, it avoids the situation of internal short circuit and heat release in the battery cell during the dismantling process, thereby avoiding the problem of fire, explosion or combustion and exhaust gas generation during battery dismantling, improving the safety and environmental protection of battery dismantling.

[0053] In one embodiment, the step of fixing the waste power battery cell 10 specifically involves fixing the waste power battery cell 10 with a fixing clamp to facilitate disassembly of the waste power battery cell 10, improve the subsequent circumferential cutting accuracy, and prevent movement due to tension during the subsequent tearing operation of the warped structure 114. Further, the fixing clamp is a rotating fixing clamp, allowing the waste power battery cell 10 to be rotated and adjusted as needed while fixed to the fixing clamp for circumferential cutting. Even further, the rotating fixing clamp includes a fixing base (not shown) and a rotating clamp body 200, the rotating clamp body 200 being rotatably connected to the fixing base and used to clamp and fix the waste power battery cell 10. In this embodiment, when circumferentially cutting the metal casing 100, adjusting the relative position of the rotating fixing clamp and the fixing clamp achieves better circumferential cutting of the waste power battery cell 10. Specifically, the rotating fixture also includes a rotating handle, which is rotatably connected to the fixed base. The rotational power output end of the rotating handle is connected to the rotating fixture body 200, causing the rotating handle to rotate relative to the fixed base. This, in turn, causes the rotating handle to drive the rotating fixture body 200 to rotate relative to the fixed base, thereby adjusting the relative position of the rotating fixture and the fixed fixture. Figure 2 As shown, the rotary clamp body 200 further comprises an upper clamp assembly 210 and a lower clamp assembly 220. The upper clamp assembly includes multiple upper clamp positioning plates, which are spaced apart on the upper surface of the metal housing 100, and all of these plates are positioned to avoid the surface defect area 110. The lower clamp assembly includes multiple lower clamp positioning plates, which are spaced apart on the lower surface of the metal housing 100, and all of these plates are positioned to avoid the surface defect area 110. This arrangement allows the rotary clamp body 200 to better clamp the metal housing 100, while avoiding interference with subsequent operations such as circumferential cutting, edge trimming, and tearing. It can be understood that the rotary clamp body 200 can be a caliper-type clamp, a jaw clamp, or a toothed clamp.

[0054] like Figure 2As shown, in one embodiment, the step of circumferentially cutting the metal casing 100 of the waste power battery cell 10 specifically involves: circumferentially cutting the tab end of the metal casing 100 of the waste power battery cell 10 using a circumferential cutting limiting cutter 300 to form a surface defect area 110 on the metal casing 100 of the waste power battery cell 10, with surface defect annular grooves 112 of predetermined depth formed on both sides of the surface defect area 110. In this embodiment, the step of circumferentially cutting the tab end of the metal casing 100 of the waste power battery cell 10 using a circumferential cutting limiting cutter 300 specifically involves: circumferentially cutting the portion of the metal casing 100 of the waste power battery cell 10 near the tab end using a circumferential cutting limiting cutter 300. This allows most of the metal casing 100 to be removed after the electrode coil and tab are pulled out. In the subsequent sorting process, most of the metal casing 100 does not need to participate in crushing and sorting, which is beneficial for subsequent crushing and sorting and improves the recycling efficiency of the waste power battery cell 10.

[0055] See also Figure 2 , Figure 5 and Figure 6 In one embodiment, the circumferential cutting limiting tool 300 includes a circumferential cutting tool holder 310, a first cutting edge 320, and a second cutting edge 330. Both the first cutting edge 320 and the second cutting edge 330 are disposed on the circumferential cutting tool holder 310. A preset distance exists between the first cutting edge 320 and the second cutting edge 330, so that when the circumferential cutting limiting tool 300 performs circumferential cutting along the surface of the metal shell 100, it forms a group of surface defect annular grooves with a predetermined spacing. This results in a more uniform surface defect area 110. In this embodiment, the first cutting edge 320 and the second cutting edge 330 are arranged parallel to each other. Further, in one embodiment, the preset distance is 5mm to 20mm. This avoids the problem of an excessively large width of the surface defect area 110 causing a large volume of the circumferential cutting limiting tool 300, and also avoids the problem of an excessively small width of the surface defect area 110 making the subsequent tear opening too small and inconvenient for removing the electrode tabs and electrode coils. This ensures that the width of the surface defect area 110 obtained from the circumferential cutting process adequately meets the requirements for removing the electrode tabs and electrode coils.

[0056] See also Figure 5 and Figure 6Furthermore, both the first blade 320 and the second blade 330 are adjustablely disposed on the circumferential cutting tool holder 310, making the preset distance between the first blade 320 and the second blade 330 adjustable, thereby improving the applicability of the dismantling method for the waste power battery cell 10. In this embodiment, the circumferential cutting limiting tool 300 also includes a first locking member 340 and a second locking member 350. Both the first blade 320 and the second blade 330 are slidably connected to the circumferential cutting tool holder 310. The first blade 320 has a first threaded hole 322, and the circumferential cutting tool holder 310 has a first through hole 312. The first locking member passes through the first through hole and the first threaded hole respectively, so that the first blade 320 is locked and fixed to the circumferential cutting tool holder by the first locking member. The second cutting edge 330 has a second threaded hole 332, and the circumferential cutting tool holder has a second through hole 314. Second locking members are respectively inserted into the second through hole and the second threaded hole, so that the second cutting edge 330 is locked and fixed to the circumferential cutting tool holder by the second locking members. Specifically, both the first and second through holes are oblong holes, allowing the connection position between the first cutting edge 320 and the circumferential cutting tool holder to be adjustable, and the connection position between the second cutting edge 330 and the circumferential cutting tool holder to be adjustable.

[0057] See also Figure 5 and Figure 6 Furthermore, the circumferential cutting tool holder 310 has a sliding groove 316, which communicates with the first through hole and the second through hole respectively. The first cutting edge 320 is located in the sliding groove and is slidably connected to the circumferential cutting tool holder, and the second cutting edge 330 is located in the sliding groove and is slidably connected to the circumferential cutting tool holder, so that both the first cutting edge 320 and the second cutting edge 330 are slidably connected to the circumferential cutting tool holder. In this embodiment, a first sliding block protrudes from the outer peripheral wall of the first cutting edge. The first sliding block is located in the sliding groove and is slidably connected to the circumferential cutting tool holder, so that the first cutting edge and the first sliding block are better slidably connected. A second sliding block protrudes from the outer peripheral wall of the second cutting edge. The second sliding block is located in the sliding groove and is slidably connected to the circumferential cutting tool holder, so that the second cutting edge and the second sliding block are better slidably connected.

[0058] In one embodiment, the predetermined depth is equal to 0.4 to 0.6 times the thickness of the metal casing 100. In this embodiment, the predetermined depth is equal to 0.5 times the thickness of the metal casing 100 to avoid damage to the internal structure of the battery and causing a short circuit during the circumferential cutting process. It is understood that the thickness of the metal casing 100 may vary for different used power battery cells 10 and can be set as needed.

[0059] Furthermore, the circumferential cutting and limiting tool 300 also includes a limiter (not shown in the figure), which is movably connected to the circumferential cutting tool holder 310, making the connection position between the limiter and the circumferential cutting tool holder 310 adjustable. In this embodiment, the limiter is threadedly connected to the circumferential cutting tool holder 310, making the limiter movably connected to the circumferential cutting tool holder 310, and the extension direction of the limiter is parallel to the extension direction of the first cutting edge 320, making the extension direction of the limiter parallel to the extension direction of the first cutting edge 320 or the second cutting edge 330. The limiter is used to abut against the metal shell 100 when the first cutting edge 320 cuts into the metal shell 100 to a predetermined depth. By adjusting the connection position between the limiter and the circumferential cutting tool holder 310, the depth to which the first cutting edge 320 or the second cutting edge 330 cuts into the metal shell 100 is adjustable, thereby adapting to waste power battery cells 10 with metal shells 100 of different thicknesses.

[0060] like Figure 2 As shown, further, the contour path for circumferentially cutting the metal casing 100 of the waste power battery cell 10 is equal to 0.75 to 1 times the circumference of the metal casing 100. In this embodiment, the contour path for circumferentially cutting the metal casing 100 of the waste power battery cell 10 is equal to 1 times the circumference of the metal casing 100, that is, circumferential cutting is performed around the surface of the metal casing 100 to avoid partial breakage when tearing the warped structure 114, and at the same time to facilitate the subsequent removal of the tabs and electrode rolls of the waste power battery cell 10.

[0061] In one embodiment, the step of performing the edge-lifting operation on the surface defect area 110 specifically involves: performing a beveling operation on the surface defect area 110 to form a warped structure 114 at the surface defect area 110 of the metal casing 100, so as to facilitate subsequent tearing operations. In one embodiment, the step of performing the beveling operation on the surface defect area 110 specifically involves: performing a beveling operation on the right-angled edge of the metal casing 100 along the circumferential cutting direction on the surface defect area 110, so as to better form the warped structure 114 in the surface defect area 110.

[0062] like Figure 3 As shown, the step of beveling the surface defect area 110 along the circumferential cutting direction on the right-angled edge of the metal casing 100 specifically involves using a beveled cutter 400 to bevel the surface defect area 110 along the circumferential cutting direction on the right-angled edge of the metal casing 100, thereby forming a warped structure 114 at the surface defect area 110 of the metal casing 100 for subsequent tearing operations. Furthermore, the beveled angle of the cutter is 10 to 15 degrees. Because the cutter itself has a beveled surface, when the right-angled end of the battery cell is inserted into the casing, the metal casing 100 curls upwards along the beveled surface of the cutter, while simultaneously allowing the cutter to avoid the internal structure of the battery.

[0063] In one embodiment, the step of tearing the warped structure 114 specifically involves: winding or tearing the warped structure 114 to separate the surface defect area 110 from the metal casing 100. Figure 4 As shown, the specific steps for winding or tearing the warped structure 114 are as follows: the clamping tool 500 is used to clamp the warped structure 114, and then the warped structure 114 is wound or torn. In this embodiment, the clamping tool is a needle-nose pliers, which allows for a good clamping of the warped structure 114, facilitating the winding or tearing operation. Since the needle-nose pliers are long, narrow clamps, after being fixed to the warped structure 114, they can be used for winding and tearing, utilizing the toughness of metal to break open the battery casing through tearing.

[0064] Further, the step of removing the tabs and electrode rolls of the waste power battery cell 10 specifically involves: applying a pulling force to both sides of the metal casing 100 while simultaneously removing the tabs and electrode rolls of the waste power battery cell 10, so that the tabs and electrode rolls of the waste power battery cell 10 can be better removed from the waste power battery cell 10. In this embodiment, the contour path of the circumferential cut of the metal casing 100 of the waste power battery cell 10 is equal to the perimeter of the metal casing 100, so that the metal casing 100 of the waste power battery cell 10 is divided into two pieces through the surface defect area 110. Thus, by applying a pulling force to both sides of the metal casing 100, the tabs and electrode rolls of the waste power battery cell 10 are pulled out from the other piece along with one piece.

[0065] like Figure 2 As shown, this application also provides a waste power battery cell 10, which is disassembled using the disassembly method for the waste power battery cell 10 described in any of the above embodiments. Further, the disassembly method for the waste power battery cell 10 includes: fixing the waste power battery cell 10; circumferentially cutting the metal casing 100 of the waste power battery cell 10 to form a surface defect area 110 on the metal casing 100, wherein a surface defect annular groove 112 of a predetermined depth is formed on both sides of the surface defect area 110; the predetermined depth is less than the thickness of the metal casing 100; performing an edge-lifting operation on the surface defect area 110 to form a warped structure 114 at the surface defect area 110 of the metal casing 100; tearing the warped structure 114 to separate the surface defect area 110 from the metal casing 100; and removing the tabs and electrode rolls of the waste power battery cell 10.

[0066] During dismantling of the aforementioned waste power battery cell 10, the waste power battery cell 10 is first fixed; then, the metal casing 100 of the waste power battery cell 10 is circumferentially cut to form a surface defect area 110 on the metal casing 100. Surface defect annular grooves 112 of a predetermined depth are formed on both sides of the surface defect area 110. Since the predetermined depth is less than the thickness of the metal casing 100, the circumferential cutting of the metal casing 100 will not puncture the metal casing 100, thus avoiding damage to the internal structure of the battery and causing a short circuit. Then, an edge-lifting operation is performed on the surface defect area 110 to allow the metal casing 100 to be lifted. A warped structure 114 is formed at the surface defect area 110 of the 00; then the warped structure 114 is torn open, so that the surface defect area 110 is torn apart from the metal casing 100. Finally, the tabs and electrode rolls of the waste power battery cell 10 are removed, thus completing the dismantling of the waste power battery cell 10. Since the above-mentioned dismantling method of the waste power battery cell 10 avoids the problem of short circuit in the internal structure of the waste power battery cell 10 during dismantling, it avoids the situation of internal short circuit and heat release in the battery cell during the dismantling process, thereby avoiding the problem of fire, explosion or combustion and exhaust gas generation during battery dismantling, improving the safety and environmental protection of battery dismantling.

[0067] Compared with the prior art, the present invention has at least the following advantages:

[0068] 1. The above-mentioned method for dismantling the waste power battery cell 10 involves first fixing the waste power battery cell 10; then, circumferentially cutting the metal casing 100 of the waste power battery cell 10 to form a surface defect area 110 on the metal casing 100. A surface defect annular groove 112 of a predetermined depth is formed on both sides of the surface defect area 110. Since the predetermined depth is less than the thickness of the metal casing 100, the circumferential cutting of the metal casing 100 will not puncture the metal casing 100, thus preventing damage to the internal structure of the battery and causing a short circuit. Next, an edge-lifting operation is performed on the surface defect area 110 to form a warped structure 114 at the surface defect area 110 of the metal casing 100. Then, the warped structure 114 is torn open, causing the surface defect area 110 to tear open from the metal casing 100. Finally, the tabs and electrode rolls of the waste power battery cell 10 are removed, thus completing the dismantling of the waste power battery cell 10.

[0069] 2. Because the above-mentioned dismantling method of waste power battery cell 10 avoids the problem of short circuit in the internal structure of waste power battery cell 10 during dismantling, it avoids the situation of internal short circuit and heat release in the battery cell during dismantling, thereby avoiding the problem of fire, explosion or combustion and exhaust gas generation during battery dismantling, thus improving the safety and environmental protection of battery dismantling.

[0070] 3. The dismantling method for waste power battery cells 10 described in this application can solve the common safety risks of power battery breakage in the battery recycling industry. Utilizing the toughness of the battery cell casing, the cell is dismantled by tearing the metal casing 100 without puncture, effectively ensuring the integrity of the battery's internal structure. This avoids short circuits, heat release, combustion, and explosions caused by damage to the internal battery cells during dismantling. Therefore, this method solves the problem of difficult casing breaking during dismantling of power battery cells in the industry, reduces safety risks, and avoids environmental pollution caused by combustion.

[0071] 4. The dismantling method of the waste power battery cell 10 in this application is simple and easy to implement. With reasonable equipment planning, automated dismantling can be achieved. It has low energy consumption cost, is safe and stable, and is green and environmentally friendly with considerable economic value.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for disassembling a used power battery cell, characterized in that, The method comprises the following steps: fixing the waste power battery monomer; circumferential cutting of the metal shell of the waste power battery monomer to form a surface defect area on the metal shell of the waste power battery monomer, both sides of the surface defect area being formed with a surface defect ring groove with a predetermined depth, the predetermined depth being less than the thickness of the metal shell; edge starting operation on the surface defect area to form a buckling structure at the surface defect area of the metal shell; winding or tearing operation on the buckling structure to tear the surface defect area on the metal shell; extending the tab and the tab roll of the waste power battery monomer; The step of circumferential cutting of the metal shell of the waste power battery monomer is specifically circumferential cutting of the tab end of the metal shell of the waste power battery monomer by a circumferential cutting limiting tool; the circumferential cutting limiting tool comprises a circumferential cutting tool holder, a first cutting edge and a second cutting edge, the first cutting edge and the second cutting edge are arranged on the circumferential cutting tool holder, the first cutting edge and the second cutting edge have a predetermined distance, and the circumferential cutting limiting tool forms a surface defect ring groove group with a predetermined distance when circumferentially cutting the surface of the metal shell; the circumferential cutting tool holder is formed with a sliding groove, the sliding groove is in communication with the first through hole and the second through hole, the first cutting edge is located in the sliding groove and is in sliding connection with the circumferential cutting tool holder, and the second cutting edge is located in the sliding groove and is in sliding connection with the circumferential cutting tool holder; The circumferential cutting limiting tool further comprises a limiting device, the limiting device is movably connected to the circumferential cutting tool holder, and the connection position of the limiting device and the circumferential cutting tool holder is adjustable; The step of edge starting operation on the surface defect area is specifically inclined cutting operation on the surface defect area in the circumferential direction of the right-angle edge of the metal shell by using an inclined cutting tool. The step of winding or tearing operation on the buckling structure is specifically winding or tearing operation on the buckling structure by clamping the buckling structure by a clamping tool.

2. The method of claim 1, wherein the method further comprises: The step of fixing the waste power battery monomer is specifically fixing the waste power battery monomer by a fixing clamp.

3. The method for disassembling the waste power battery monomer according to claim 1, wherein The first cutting edge and the second cutting edge are movably arranged on the circumferential cutting tool holder. The circumferential cutting limiting tool further comprises a first locking member and a second locking member, the first cutting edge and the second cutting edge are in sliding connection with the circumferential cutting tool holder, the first cutting edge is provided with a first threaded hole, the circumferential cutting tool holder is provided with a first through hole, and the first locking member is respectively arranged in the first through hole and the first threaded hole; the second cutting edge is provided with a second threaded hole, the circumferential cutting tool holder is provided with a second through hole, and the second locking member is respectively arranged in the second through hole and the second threaded hole; and the first through hole and the second through hole are both waist-shaped holes.

4. The method according to claim 3, wherein The predetermined distance is 5mm-20mm.

5. The method according to claim 4, wherein The predetermined depth is equal to 0.4-0.6 times the thickness of the metal shell.

6. The method of claim 1, wherein the method further comprises: The method for disassembling the waste power battery monomer is disassembled by using the method for disassembling the waste power battery monomer according to any one of claims 1-6.

7. A used power battery cell, characterized by, ​

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