A method for disassembling a battery cell

Abstract

The present application relates to a method and device for disassembling a battery cell, and to the field of battery disassembly technology, which includes step one: blowing air between the last layer of the tail diaphragm of the battery cell and the adjacent layer; step two: using an adhesive tape longer than a first size to stick the last layer of the tail diaphragm, and moving the part where the adhesive tape is bonded to the last layer of the tail diaphragm to enlarge the gap between the last layer of the tail diaphragm and the adjacent layer, and the first size is the width of the unfolded diaphragm; step three: cutting the last layer of the tail diaphragm to obtain a diaphragm head separated from the opening end of the tail diaphragm, and the opening end of the tail diaphragm is the end of the diaphragm bonded with the tape; step four: cutting off at least part of the external connection part, and the external connection part is the part where the adhesive tape is not bonded to the diaphragm. The present application uses an adhesive tape to bond the tail diaphragm, and after obtaining the diaphragm head, cuts off the part of the adhesive tape outside the diaphragm, which has the effect of reducing damage to the electrode and diaphragm during disassembly and facilitating the disassembly of the battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of battery disassembly, and in particular to a battery cell disassembly method. Background Art

[0002] At present, the application of lithium batteries is increasing. When untreated waste lithium-ion batteries enter the environment, the metal ions contained in the positive electrode material, the carbon dust of the negative electrode material, the strong alkali and heavy metal ions in the electrolyte can all have an impact on the environment and even cause heavy metal pollution. The cobalt, lithium, copper and plastic in waste lithium batteries are all valuable resources and have recycling value.

[0003] The lithium battery recycling process mainly includes discharge-disassembly-shredding-iron removal-crushing-magnetic separation-crushing-gravity separation-air separation. When disassembling the battery, the outer shell, diaphragm, positive electrode and negative electrode need to be separated and processed separately.

[0004] After the existing battery cell is taken out of the casing, a diaphragm is wrapped around the outside of the battery cell, and the end of the diaphragm is fixed with tape.

[0005] Since the diaphragm and the electrode are relatively fragile, directly removing the tape may damage the diaphragm and the electrode. Summary of the invention

[0006] The present application provides a method for disassembling a battery cell, which reduces damage to pole pieces and diaphragms during disassembly and facilitates disassembly of the battery cell.

[0007] The present application provides a method for disassembling a battery cell, comprising the steps of: blowing air between a last layer of a finishing diaphragm of a battery cell and an adjacent layer to eliminate stress between the last layer of the finishing diaphragm of the battery cell and the adjacent layer, wherein the last layer of the finishing diaphragm is the outermost diaphragm of the battery cell, and the adjacent layer is a diaphragm adjacent to the last layer of the finishing diaphragm; step 2: using an adhesive tape longer than a first size to stick the last layer of the finishing diaphragm, moving the portion where the adhesive tape is bonded to the last layer of the finishing diaphragm, so that the gap between the last layer of the finishing diaphragm and the adjacent layer becomes larger, wherein the first size is the width of the unfolded diaphragm; step 3: cutting the last layer of the finishing diaphragm to obtain a diaphragm start separated from an open end of the finishing diaphragm, wherein the open end of the finishing diaphragm is the end of the diaphragm bonded with the tape; and step 4: cutting off at least part of an external connection portion, wherein the external connection portion is a portion where the adhesive tape is not bonded to the last layer of the finishing diaphragm.

[0008] In the above technical scheme, air is blown into the battery cell, and the gas enters between the last layer of the finishing diaphragm and the adjacent layers, which can facilitate the subsequent increase in the gap between the last layer of the finishing diaphragm and the adjacent layers; after the adhesive tape bonds and moves the last layer of the finishing diaphragm, the gap between the last layer of the finishing diaphragm and the adjacent layers increases, which is convenient for the cutter to cut the last layer of the finishing diaphragm, and avoids damage to the adjacent layers when the cutter cuts the last layer of the finishing diaphragm. After the cutter completes the cutting of the last layer of the finishing diaphragm, the diaphragm start is obtained, which is convenient for clamping the diaphragm start in the subsequent process, and moving the diaphragm start to disassemble the battery cell. This scheme can disassemble the battery cell without tearing off the tape, reducing the risk of damaging the diaphragm and the electrode when tearing off the tape.

[0009] Part of the external portion of the adhesive tape is cut off to reduce or avoid the external portion of the adhesive tape from naturally sagging to the two sides of the battery cell. The external portion is in adhesive contact with the two sides of the battery cell, which affects the subsequent disassembly of the battery cell, thereby facilitating the disassembly of the battery cell.

[0010] The present application also provides a battery cell disassembly device using the above-mentioned battery cell disassembly method, including a bonding component, a cutting component and a laminating component; wherein the bonding component is used to stick an adhesive tape longer than a first size to the last layer of the finishing diaphragm, and move the part where the adhesive tape is bonded to the last layer of the finishing diaphragm to enlarge the gap between the last layer of the finishing diaphragm and the adjacent layer, wherein the last layer of the finishing diaphragm is the outermost diaphragm of the battery cell, and the adjacent layer is a layer of diaphragm adjacent to the last layer of the finishing diaphragm; the cutting component is used to cut the last layer of the finishing diaphragm after the gap with the adjacent layer is enlarged, and obtain a diaphragm start separated from an open end of the finishing diaphragm, and the open end of the finishing diaphragm is the end of the diaphragm bonded with the tape; the cutting component is used to cut off at least part of the external portion after obtaining the diaphragm start, and the external portion is the portion where the adhesive tape is not bonded to the diaphragm.

[0011] In the above technical solution, the bonding component increases the gap between the last layer of the diaphragm and the adjacent layer, making it easier for the cutter component to cut the last layer of the diaphragm to form the beginning of the diaphragm, and facilitating the subsequent disassembly of the battery cell by clamping and moving the beginning of the diaphragm.

[0012] The cutting assembly cuts off part of the outer portion of the adhesive tape to prevent the outer portion of the adhesive tape from naturally sagging to both sides of the battery cell, and the adhesive tape is in contact with both sides of the battery cell, which affects the subsequent disassembly of the battery cell, thereby facilitating the disassembly of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the structure of a cell to be cut in an embodiment;

[0014] Figure 2 The present invention is a schematic diagram of the structure of the bonding component, the cutting component and the blowing component relative to the battery cell in an embodiment;

[0015] Figure 3 is a schematic diagram of the structure of the cutting components and the adhesive tape relative to the battery cell in an embodiment;

[0016] Figure 4 The schematic diagram of the structure of the battery cell showing the last layer of the finishing diaphragm and the adjacent layers in an embodiment;

[0017] Figure 5 is a schematic diagram of the structure of a cutting component and a bonding component in an embodiment;

[0018] Figure 6 The structure diagram of a pressing mechanism in an embodiment.

[0019] 1. Battery cell; 11. Open end of the finishing diaphragm; 13. Tab; 14. Last layer of the finishing diaphragm; 15. Adjacent layer; 2. Adhesive tape; 3. Blowing assembly; 4. Laminating assembly; 41. Adhesive tape; 411. Adhesive portion; 412. External portion; 42. Clamping jaw; 43. Pressing mechanism; 431. Roller; 432. First drive component; 4321. Second mounting seat; 4322. Third guide rail; 433. Second drive component; 4331. First mounting seat; 4332. First slider; 4333. Reversing rod; 4334. Second slider; 4335. First guide rail; 4336. Second guide rail; 5. Cutter assembly; 6. Cutting assembly; 61. Cutting piece; 611. Blade; 62. Cutting drive. DETAILED DESCRIPTION

[0020] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0021] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0022] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0023] An embodiment of the present application discloses a battery device. This embodiment is explained by taking a square battery cell as an example. The square battery cell includes a diaphragm and pole pieces. The pole pieces include a positive pole piece and a negative pole piece. The diaphragm is located between the positive pole piece and the negative pole piece. The stacking order of each layer in the battery cell is generally diaphragm, positive pole piece, diaphragm, negative pole piece and diaphragm. The diaphragm maintains insulation between the positive pole piece and the negative pole piece.

[0024] The battery cells include laminated cells and wound cells. When the battery cells are produced, no matter after the laminated cells are stacked or the wound cells are wound, the diaphragm will continue to be wound around the battery cells, with at least 1.5 turns. The diaphragm that continues to be wound outside the battery cells is also called the tail diaphragm, and then the end of the diaphragm is fixed to the battery cells with tape. The diaphragm on the outside of the battery cells protects the battery cells. When the battery cells are placed in the outer shell, the diaphragm on the outside of the battery cells can also maintain the insulation between the battery cells and the outer shell.

[0025] Generally, the outer layer of the battery cell is wrapped with at least two layers of diaphragms. When the battery cell is taken out of the shell, the two outer layers of diaphragms are attached to each other, and the end of the outermost diaphragm is fixed with tape. When the tape is directly torn off, the diaphragm and the pole piece are easily damaged because they are thin. This embodiment takes a laminated battery cell as an example for explanation.

[0026] Reference Figure 1 , a battery cell disassembly method, comprising:

[0027] Step 1: Blow air between the last layer 14 of the end diaphragm of the battery cell 1 and the adjacent layer 15 to eliminate the stress between the last layer 14 of the end diaphragm of the battery cell 1 and the adjacent layer 15, wherein the last layer 14 of the end diaphragm is the outermost diaphragm of the battery cell 1, and the adjacent layer 15 is a diaphragm adjacent to the last layer 14 of the end diaphragm;

[0028] Step 2: Use an adhesive tape 41 longer than the first dimension to adhere the last layer 14 of the end diaphragm, and move the portion where the adhesive tape 41 is bonded to the last layer 14 of the end diaphragm to enlarge the gap between the last layer 14 of the end diaphragm and the adjacent layer 15. The first dimension is the width of the unfolded diaphragm.

[0029] Step 3: cutting the last layer 14 of the finishing diaphragm to obtain the beginning of the diaphragm separated from the opening end 11 of the finishing diaphragm, the opening end 11 of the finishing diaphragm being the end of the diaphragm bonded with the adhesive tape 2;

[0030] Step 4: Cut off at least part of the external connection portion, where the external connection portion is the portion of the adhesive tape 41 that is not bonded to the final diaphragm layer 14 .

[0031] Specifically, refer to Figure 4 , which illustrates the shape of the diaphragm in the battery cell 1. The outermost diaphragm of the battery cell 1 is the final diaphragm layer 14, and the diaphragm adjacent to the final diaphragm layer 14 is the adjacent layer 15. The end of the diaphragm is fixed to the battery cell 1 with a tape 2. To facilitate display of the final diaphragm opening end 11, the tape 2 is separated from the diaphragm.

[0032] In step 1, after the battery cell 1 is placed at the set work station, air is blown toward the battery cell 1 to eliminate the stress between the last layer 14 of the end diaphragm of the battery cell 1 and the adjacent layer 15 .

[0033] The stress between the last layer 14 of the tail diaphragm and the adjacent layer 15 is that when the two diaphragms are attached to each other, there is an adsorption force between the two diaphragms, and the movement of the last layer 14 of the tail diaphragm will adsorb the adjacent layer 15 and move synchronously.

[0034] The method of eliminating the stress between the last layer 14 of the tail diaphragm and the adjacent layer 15 is to blow air into the space between the last layer 14 of the tail diaphragm and the adjacent layer 15 so as to separate the last layer 14 of the tail diaphragm and the adjacent layer 15 from each other.

[0035] In the prior art, if air is not blown between the last layer 14 of the finishing diaphragm and the adjacent layer 15, when the last layer 14 of the finishing diaphragm is moved, the adjacent layer 15 will move synchronously with the last layer 14 of the finishing diaphragm. Blowing air between the last layer 14 of the finishing diaphragm and the adjacent layer 15 can facilitate the subsequent separate treatment of the last layer 14 of the finishing diaphragm.

[0036] It should be noted that, in this embodiment, the direction of blowing toward the battery cell 1 is the first direction, which is a direction starting from the opening end 11 of the tail diaphragm and extending along the length direction of the unfolded diaphragm. The first direction is represented by the X direction in the drawings.

[0037] Since the process of blowing air along the first direction toward the battery cell 1 starting from the opening end 11 of the finishing diaphragm is carried out after the process of cutting the pole ear 13 of the battery cell 1, debris will remain at the pole ear 13 when the pole ear 13 is cut. Blowing air along the first direction instead of blowing along the pole ear end avoids the risk of debris entering the battery cell 1 and causing mixing.

[0038] Air is blown toward the battery cell 1 along a first direction starting from the opening end 11 of the tail diaphragm. Since the battery cell 1 has an opening at the opening end 11 of the tail diaphragm, air can be accurately delivered between the last layer 14 of the tail diaphragm and the adjacent layer 15 to eliminate the stress between the last layer 14 of the tail diaphragm and the adjacent layer 15, so that a gap appears between the last layer 14 of the tail diaphragm and the adjacent layer 15.

[0039] In another embodiment, when blowing air into the battery cell 1 to eliminate the stress between the last layer 14 of the finishing separator and the adjacent layer 15 , air is blown toward the end of the battery cell 1 where the tab 13 is provided, and the air flow direction is perpendicular to the first direction.

[0040] Reference Figure 2 In step 2, use an adhesive tape 41 longer than the first size to stick the last layer 14 of the finishing diaphragm, and move the portion where the adhesive tape 41 is bonded to the last layer 14 of the finishing diaphragm to increase the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15.

[0041] For ease of explanation, the second direction and the third direction are defined, the second direction is the width direction of the unfolded diaphragm, and the third direction is the thickness direction of the diaphragm. In the drawings, the second direction is represented as the Y direction, and the third direction is represented as the Z direction.

[0042] Exemplarily, the width of the expanded diaphragm refers to the width of the diaphragm after the diaphragm and the electrode in the battery cell are disassembled and separated and the diaphragm is expanded.

[0043] The length of the adhesive tape 41 is set along the second direction, and the length of the adhesive tape 41 is longer than the dimension of the separator along the second direction. Both ends of the adhesive tape 41 along the second direction are located outside the two ends of the battery cell 1 along the second direction.

[0044] After the adhesive tape 41 is bonded to the last layer 14 of the finishing diaphragm, part of the adhesive tape 41 is still located outside the end of the diaphragm along the second direction. The part of the adhesive tape 41 located outside the diaphragm can drive the part of the adhesive tape 41 bonded to the diaphragm and the last layer 14 of the finishing diaphragm to move, thereby increasing the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15. Figure 1 In the figure, a dotted line frame is used to indicate the bonding position on the last layer 14 of the final separator of the battery cell 1.

[0045] It should be noted that when the last layer 14 of the finishing diaphragm is separated from the adjacent layer 15, an arched space is formed between the two.

[0046] Step 3: Cut the last layer 14 of the finishing diaphragm to obtain the beginning of the diaphragm separated from the opening end 11 of the finishing diaphragm, where the opening end 11 of the finishing diaphragm is the end of the diaphragm bonded with the tape 2.

[0047] Exemplarily, the final separator layer 14 is cut along the second direction of the separator, and the open end of the final separator layer 14 is still bonded and fixed to the separator by the adhesive tape 2, and the beginning of the separator formed after cutting is the new end of the separator. In the figure, the position of the cutting seam on the final separator layer 14 of the battery cell 1 is indicated by a dotted line.

[0048] In this embodiment, when cutting the last diaphragm layer 14, the cutting position avoids the position where the last diaphragm layer 14 is bonded to the adhesive tape 41. In another embodiment, when cutting the last diaphragm layer 14, the cutting position can be located at the position where the last diaphragm layer 14 is bonded to the adhesive tape 41.

[0049] In the subsequent disassembly operation, clamp and pull the diaphragm head to disassemble the diaphragm and pole piece.

[0050] Reference Figure 3 Step 4: Cut off at least part of the external portion 412 of the adhesive tape 41 , where the external portion 412 is the portion of the adhesive tape 41 that is not bonded to the final diaphragm layer 14 .

[0051] Specifically, the adhesive tape 41 includes an adhesive portion 411 and an externally connected portion 412 . The adhesive portion 411 is a portion of the adhesive tape 41 that is bonded to the final diaphragm layer 14 .

[0052] The external connection part 412 is the part of the adhesive tape 41 that is not bonded to the final diaphragm layer 14. The external connection part 412 is located outside the diaphragm, and the external connection part 412 is the two ends of the adhesive tape 41 along the second direction. The external connection part 412 has two parts, and the adhesive part 411 is located between the two parts of the external connection part 412. In the drawings, in order to easily distinguish the adhesive part 411 from the external connection part 412, the adhesive part 411 is a region filled with scattered dots, and the external connection part 412 is a region filled with a cross pattern.

[0053] Part or all of the external connection portion 412 is cut off and the cut external connection portion 412 is taken away, and only the bonding portion 411 or part of the external connection portion 412 is located on the battery cell 1 .

[0054] When the diaphragm begins to form, the adhesive tape 41 is bonded to the diaphragm. If the clamping of the adhesive tape 41 is directly removed, the external connection part 412 of the adhesive tape 41 outside the diaphragm will naturally droop to the two sides of the battery cell 1, and the adhesive tape 41 will be bonded and connected to the two sides of the battery cell 1, affecting the subsequent disassembly of the battery cell 1.

[0055] In this embodiment, after at least the portion of the adhesive tape 41 outside the diaphragm is cut off, the influence of the adhesion between the external connection portion 412 on the adhesive tape 41 and the side of the battery cell 1 on subsequent disassembly can be reduced or avoided, thereby facilitating disassembly of the battery cell 1 .

[0056] In this embodiment, the end layer 14 of the finishing diaphragm is cut to form the beginning of the diaphragm, thereby avoiding the disassembly between the tape 2 and the opening end 11 of the finishing diaphragm, thereby avoiding damage to the diaphragm and the electrode when the tape 2 is disassembled. The removal of the external connection part 412 can realize the smooth disassembly of the battery cell 1 when the diaphragm beginning is clamped and moved.

[0057] Reference Figure 2 As an optional solution, the adhesive tape 41 is attached to the last layer 14 of the finishing diaphragm, and the method of moving the portion where the adhesive tape 41 is attached to the last layer 14 of the finishing diaphragm includes:

[0058] Step a: The clamping external connection portion 412 is moved to a set position above the last layer 14 of the finishing diaphragm, and the position of the clamped portion of the adhesive tape 41 is kept fixed;

[0059] Step b: driving the adhesive tape 41 located just above the last layer 14 of the tail diaphragm to move and adhere to the tail diaphragm, and at this time, the adhesive tape 41 undergoes elastic deformation;

[0060] Step c: Remove the driving pressure on the portion of the adhesive tape 41 located directly above the last layer of the tail diaphragm, and the adhesive tape 41 recovers its deformation and moves with the last layer of the tail diaphragm 14 to increase the gap between the last layer of the tail diaphragm 14 and the adjacent layer 15.

[0061] Specifically, when bonding the last layer 14 of the finishing diaphragm, the clamping external connection part 412 is moved to the top of the last layer 14 of the finishing diaphragm. At this time, the thickness direction of the adhesive tape 41 is the same as the thickness direction of the last layer 14 of the finishing diaphragm, both along the third direction, the length of the adhesive tape 41 is along the width direction of the diaphragm, and the two parts of the external connection part 412 are both located on the outside of the two ends of the diaphragm along the second direction.

[0062] The adhesive tape 41 includes a deformation strip and an adhesive layer. The adhesive layer is located on one side of the thickness of the deformation strip. When the adhesive tape 41 is located above the final diaphragm layer 14 , the adhesive layer is located on the side of the deformation strip facing the final diaphragm layer 14 .

[0063] The adhesive tape 41 is acted on the portion located directly above the last diaphragm layer 14, so that the portion located directly above the last diaphragm layer 14 moves toward the battery cell 1, so that the adhesive tape 41 is elastically deformed, and the adhesive portion 411 contacts and bonds with the last diaphragm layer 14, thereby achieving the bonding of the adhesive tape 41 to the last diaphragm layer 14. It can also be understood that the adhesive portion 411 moves toward the battery cell 1 to contact and bond with the last diaphragm layer 14, and the position of the external connection portion 412 remains fixed.

[0064] It should be noted that the third direction at this time is the height direction, and the adhesive tape 41 is located directly above the last layer 14 of the finishing separator, which is the state when the battery cell 1 and the adhesive tape 41 are placed in sequence along the third direction.

[0065] When the force applied to the adhesive portion 411 is removed, the adhesive tape 41 recovers its deformation, and the adhesive portion 411 moves upward, and the adhesive portion 411 moves synchronously with the final diaphragm layer 14, so that the gap between the final diaphragm layer 14 and the adjacent layer 15 is further increased.

[0066] Furthermore, the position where the adhesive tape 41 is bonded to the last layer 14 of the finishing diaphragm is located in the middle of the last layer 14 of the finishing diaphragm along the length direction of the diaphragm.

[0067] Reference Figure 1 As an optional solution, in step a, the gap between the adhesive tape 41 and the final diaphragm layer 14 is between 10 mm and 35 mm.

[0068] Specifically, the gap between the adhesive tape 41 and the last layer 14 of the finishing diaphragm is any gap greater than or equal to 10 mm and less than or equal to 35 mm. Exemplarily, the gap between the adhesive tape 41 and the last layer 14 of the finishing diaphragm is 20 mm. Optionally, the gap between the adhesive tape 41 and the last layer 14 of the finishing diaphragm is 10 mm, 13 mm, 15 mm, 18 mm, 23 mm, 25 mm, 30 mm, 32 mm or 35 mm.

[0069] When the gap between the adhesive tape 41 and the last layer 14 of the finishing diaphragm is less than 10 mm, the distance that the adhesive portion 411 moves with the last layer 14 of the finishing diaphragm is less than 10 mm, and the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15 is relatively small, which is not convenient for subsequent cutting of the last layer 14 of the finishing diaphragm.

[0070] The gap between the adhesive tape 41 and the last layer 14 of the finishing diaphragm is larger than 35 mm, the adhesive tape 41 is greatly deformed, and plastic deformation of the adhesive tape 41 may occur. After the action on the adhesive portion 411 is removed, the adhesive portion 411 cannot or can only partially recover the elastic deformation.

[0071] In step a, a suitable gap is selected between the adhesive tape 41 and the final diaphragm layer 14 to facilitate cutting of the final diaphragm layer 14 while ensuring that the adhesive tape 41 can recover its elastic deformation.

[0072] Reference Figure 2 As an optional solution, the method of sticking the adhesive tape 41 to the final diaphragm layer 14 in step 2 includes:

[0073] Step m: Clamp the external connection portion 412 and move it to a set position above the last layer 14 of the finishing diaphragm.

[0074] Step n: driving the adhesive tape 41 to move toward the last layer 14 of the finishing diaphragm to be bonded with the last layer 14 of the finishing diaphragm.

[0075] Specifically, when bonding the last layer 14 of the finishing diaphragm, the clamped adhesive tape 41 is moved to the top of the last layer 14 of the finishing diaphragm. At this time, the thickness direction of the adhesive tape 41 is the same as the thickness direction of the last layer 14 of the finishing diaphragm, the length of the adhesive tape 41 is along the width direction of the diaphragm, and both ends of the length of the adhesive tape 41 are located on the outside of the two ends of the diaphragm width.

[0076] The driving adhesive tape 41 moves to contact and bond with the final diaphragm layer 14 , that is, the adhesive portion 411 is bonded with the final diaphragm layer 14 .

[0077] The adhesive tape 41 is moved away from the battery cell 1 , and the adhesive portion 411 moves with the final separator layer 14 , so that the final separator layer 14 moves away from the battery cell 1 and the gap with the adjacent layer 15 increases.

[0078] Reference Figure 2 , as an optional solution, further comprising a step o after the step n;

[0079] Step o: applying pressure to the portion where the adhesive tape 41 contacts the last layer 14 of the finishing diaphragm, so that the adhesive tape 41 and the last layer 14 of the finishing diaphragm are in close contact.

[0080] Specifically, after the adhesive tape 41 moves to contact and adhere to the last layer 14 of the finishing diaphragm, pressure is applied to the adhesive tape 41 toward the last layer 14 of the finishing diaphragm, so that the adhesive tape 41 and the last layer 14 of the finishing diaphragm are closely attached.

[0081] After the adhesive tape 41 is tightly attached to the last diaphragm layer 14 , the adhesive tape 41 is moved away from the battery cell 1 , so that the adhesive tape 41 moves with the last diaphragm layer 14 to increase the gap between the last diaphragm layer 14 and the adjacent layer 15 .

[0082] The adhesive tape 41 and the last layer 14 of the finishing diaphragm are further pressed to maintain a stable connection between the adhesive tape 41 and the last layer 14 of the finishing diaphragm, ensuring that the adhesive tape 41 can move with the last layer 14 of the finishing diaphragm.

[0083] Reference Figure 2 As an optional solution, after using step m and step n, the method of moving the portion where the adhesive tape is bonded to the last layer 14 of the finishing diaphragm in step 2 includes:

[0084] The external connection portion 412 is lifted in a direction away from the last layer 14 of the finishing diaphragm, and the adhesive tape 41 moves with the last layer 14 of the finishing diaphragm to increase the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15 .

[0085] Specifically, the external connection portion 412 is lifted along the third direction, and the adhesive tape 41 moves as a whole. The adhesive tape 41 moves with the last layer 14 of the finishing diaphragm to increase the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15 .

[0086] Reference Figure 2 This embodiment also discloses a battery cell disassembly device using the above-mentioned battery cell disassembly method, including a bonding component 4, a cutter component 5 and a cutting component 6.

[0087] The laminating component 4 is used to adhere the adhesive tape 41 longer than the first dimension to the last layer 14 of the finishing diaphragm, and move the portion where the adhesive tape 41 is bonded to the last layer 14 of the finishing diaphragm to increase the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15 .

[0088] The cutter assembly 5 is used to cut the last layer 14 of the finishing diaphragm after the gap with the adjacent layer 15 is enlarged, so as to obtain the diaphragm start separated from the opening end 11 of the finishing diaphragm.

[0089] The cutting assembly 6 is used to cut off at least a portion of the external portion 412 after obtaining the diaphragm start.

[0090] Specifically, the laminating component 4 adheres to the last layer 14 of the tail diaphragm and drives the last layer 14 of the tail diaphragm to move away from the adjacent layer 15 along the thickness direction, so that a gap appears between the last layer 14 of the tail diaphragm and the adjacent layer 15 .

[0091] Reference Figure 3Exemplarily, the bonding component 4 includes a group of jaws 42 and an adhesive tape 41. The group of jaws 42 includes two jaws 42. The two jaws 42 respectively clamp the two ends of the adhesive tape 41 in the length direction. The jaws of the jaws 42 clamp the adhesive tape 41. The jaws 42 clamp the adhesive tape 41 and move it to above the last layer 14 of the finishing diaphragm.

[0092] After the adhesive portion 411 moves to bond with the last layer 14 of the finishing diaphragm, the adhesive portion 411 moves away from the battery cell 1, and the adhesive tape 41 moves synchronously with the last layer 14 of the finishing diaphragm to increase the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15. Exemplarily, only the adhesive portion 411 of the adhesive tape 41 moves to bond with the last layer 14 of the finishing diaphragm, and the external portion 412 remains fixed; optionally, the adhesive tape 41 moves as a whole to bond the adhesive portion 411 to the last layer 14 of the finishing diaphragm.

[0093] When only the adhesive portion 411 in the adhesive tape 41 moves to bond with the last layer 14 of the finishing diaphragm and the external portion 412 remains fixed, the bonding component 4 also includes a pressing piece, which applies a downward pressure on the adhesive portion 411 toward the last layer 14 of the finishing diaphragm, and the adhesive tape 41 undergoes elastic deformation until the adhesive portion 411 bonds with the last layer 14 of the finishing diaphragm.

[0094] When the adhesive tape 41 moves as a whole and the adhesive portion 411 is bonded to the last layer 14 of the finishing diaphragm, the clamping jaws 42 directly drive the adhesive tape 41 to move toward the last layer 14 of the finishing diaphragm and the adhesive portion 411 is bonded to the last layer 14 of the finishing diaphragm.

[0095] The cutter assembly 5 cuts the last layer 14 of the finishing membrane to form the beginning of the membrane. Exemplarily, the cutter assembly 5 includes a cutter and a linear drive member, and the linear drive member drives the cutter to reciprocate along the width direction of the membrane. The cutter and the linear drive member are not shown in the drawings.

[0096] When the bonding component 4 adheres to the last layer 14 of the finishing diaphragm and moves, and the gap between the last layer 14 of the finishing diaphragm and the adjacent layer 15 increases, the linear drive member drives the cutter to move. The moving direction can be first moving back to the third direction to start cutting the last layer 14 of the finishing diaphragm, and then moving along the second direction to continue cutting the last layer 14 of the finishing diaphragm. After the cutter cuts the last layer 14 of the finishing diaphragm, the beginning of the diaphragm is obtained.

[0097] Reference Figure 5 The cutting assembly 6 is used to cut off at least a portion of the external portion 412 after obtaining the diaphragm start.

[0098] As an optional solution, the cutting assembly 6 includes two cutting pieces 61, which are located between the two clamping jaws 42, and the two cutting pieces 61 are fixedly connected to the two clamping jaws 42 in a one-to-one correspondence; the cutting piece 61 includes two blades 611, and the two blades 611 are hinged to each other.

[0099] The cutting assembly 6 further includes two cutting driving members 62 , which drive the two cutting members 61 one by one. The cutting driving members 62 drive the two blades 611 to rotate relative to or opposite to each other to the first position or the second position.

[0100] Specifically, the cutting drive member 62 is fixed on the clamping jaw 42, and the cutting drive member 62 moves with the clamping jaw 42. It should be noted that the movement of the clamping jaw 42 refers to the state change inside the clamping jaw 42 itself, which is not considered as the movement of the clamping jaw 42.

[0101] The driving end of the cutting drive member 62 is connected to the two blades 611. When the cutting drive member 62 moves, it drives the two blades 611 to move synchronously. It should be noted that when the driving end of the cutting drive member 62 drives the two blades 611 to rotate, it is not considered as the movement of the cutting drive member 62.

[0102] When the two blades 611 rotate to the first position, the angle between the two blades 611 is the largest. When the clamping jaws 42 clamp the adhesive tape 41, the adhesive tape 41 is completely located between the two blades 611 in the first position.

[0103] When the two blades 611 rotate to the second position, the two blades 611 partially overlap. When the two blades 611 rotate from the first position to the second position, the cutting member 61 cuts the adhesive tape 41 .

[0104] The cutting piece 61 is used to cut the position where the adhesive portion 411 is connected to the external portion 412, or to cut a part of the external portion 412, so that the external portion 412 on the adhesive tape 41 is reduced or eliminated, avoiding the external portion from hanging down to the side of the battery cell 1 and adhering to the side of the battery cell 1, affecting the subsequent disassembly of the battery cell 1.

[0105] In another embodiment, the cutting assembly 6 includes a cutter and a fourth driving member. The size of the cutter along the first direction is greater than the width of the adhesive tape 41 along the first direction. The fourth driving member drives the cutter to reciprocate along the thickness direction of the diaphragm. The cutter is located directly above the adhesive tape 41.

[0106] After the cutter assembly 5 cuts the last layer 14 of the finishing diaphragm, the fourth driving member drives the cutter to move along the third direction toward the adhesive tape 41 , and the cutter cuts the adhesive tape 41 to achieve cutting of the external portion 412 , so that no or only a portion of the external portion 412 remains on the adhesive portion 411 .

[0107] Reference Figure 2 As an optional solution, the cutter is a hot cutter. Specifically, the temperature of the cutter is between 150°C and 250°C.

[0108] The diaphragm is elastic and includes a ceramic layer. Ordinary cutters have poor cutting effects on the diaphragm, and long-term friction between ordinary cutters and the ceramic layer shortens the life of the cutter. Hot cutters have good cutting effects on the diaphragm and have a long service life.

[0109] Reference Figure 5 As an optional solution, the laminating component 4 further includes a laminating mechanism 43 , and the laminating mechanism 43 includes a roller 431 , a first driving component 432 and a second driving component 433 .

[0110] The first driving component 432 can drive the roller 431 to move toward or away from the adhesive tape 41 and can drive the roller 431 to move to a first position, where the roller 431 contacts the adhesive tape 41 and bonds the adhesive tape 41 to the last layer 14 of the finishing diaphragm.

[0111] The second driving component 433 can drive the roller 431 located at the first position to move on the surface of the adhesive tape 41 to attach the adhesive tape 41 to the last layer 14 of the finishing diaphragm.

[0112] Reference Figure 6 The first driving component 432 can drive the roller 431 to move toward or away from the adhesive tape 41. For example, the first driving component 432 can drive the roller 431 to reciprocate along the third direction. Optionally, the first driving component 432 can drive the roller 431 to reciprocate along a direction having an angle with the third direction.

[0113] The first driving component 432 includes a second fixed mounting seat 4321 , a third guide rail 4322 and a first driving member. The second mounting seat 4321 is fixed relative to the ground, and the first driving member and the third guide rail 4322 are fixed on the second mounting seat 4321 .

[0114] The second driving component 433 can drive the drivable roller 431 to move on the surface of the adhesive tape 41. Exemplarily, the second driving component 433 can drive the drivable roller 431 to move in the second direction; optionally, the second driving component 433 can drive the drivable roller 431 to move in the first direction.

[0115] This embodiment is described by taking the example that the second driving component 433 can drive the roller 431 to move along the second direction, the second driving component 433 is mounted on the third guide rail 4322 to slide along the third direction, the first driving member drives the second driving component 433 to slide back and forth along the third direction on the third guide rail 4322, and can lock the second driving component 433 in a set position. Exemplarily, the first driving member is a cylinder, which is not shown in the drawings.

[0116] The second driving component 433 includes a first slider 4332 , a reversing rod 4333 , a second slider 4334 , a first mounting seat 4331 and a second driving member.

[0117] The first mounting seat 4331 is assembled on the third guide rail 4322 so as to slide along the third direction. When the first mounting seat 4331 slides on the third guide rail 4322 along the third direction, the second driving component 433 slides synchronously as a whole.

[0118] The first slider 4332 is slidably connected to the first mounting seat 4331 along the second direction, and the second slider 4334 is slidably connected to the first mounting seat 4331 along the third direction. Both ends of the reversing rod 4333 are respectively hinged to the first slider 4332 and the second slider 4334, and the axis of relative rotation between the reversing rod 4333 and the first slider 4332 is along the second direction, and the axis of relative rotation between the reversing rod 4333 and the second slider 4334 is along the second direction.

[0119] The second driving member is fixed on the first mounting seat 4331, and the driving end of the second driving member is fixedly connected to the second slider 4334. The second driving member drives the second slider 4334 to slide back and forth along the third direction. Exemplarily, the first driving member is a cylinder, the cylinder body of the cylinder is fixed to the first mounting seat 4331, and the piston rod of the cylinder is fixedly connected to the second slider 4334. The second driving member is not shown in the drawings.

[0120] When the second slider 4334 slides along the third direction, the second slider 4334 drives the first slider 4332 to slide along the second direction through the reversing rod 4333. The roller 431 is rotatably mounted on the first slider 4332, and the rolling axis of the roller 431 is along the second direction.

[0121] When the first driving member locks the second driving member 433 at the set position, the roller 431 is located at the first position. At this time, the roller 431 contacts and presses the adhesive tape 41, and the adhesive tape 41 in the contact and pressing area with the roller 431 is bonded to the last layer 14 of the finishing diaphragm.

[0122] When the roller 431 is in the first position, the second driving member drives the second slider 4334 to slide along the third direction, and the second slider 4334 drives the first slider 4332 to slide along the second direction through the reversing rod 4333. The roller 431 rolls on the surface of the adhesive tape 41 along the second direction, pressing the adhesive tape 41 and the last layer 14 of the finishing diaphragm together.

[0123] Furthermore, the reversing rod 4333 is a telescopic rod with an adjustable length and a fixed length.

[0124] Furthermore, two first sliders 4332 and reversing rods 4333 are provided. One end of the two reversing rods 4333 is hinged to the second slider 4334, and the other end is respectively hinged to the two first sliders 4332 in a one-to-one correspondence. When the second slider 4334 slides along the third direction, the second slider 4334 drives the two first sliders 4332 to slide relative to or opposite to each other along the second direction through the two reversing rods 4333.

[0125] Furthermore, the pressing mechanism 43 further includes a first guide rail 4335 and a second guide rail 4336. The first guide rail 4335 is arranged along the third direction and is fixed on the first mounting seat 4331; the first slider 4332 is slidably mounted on the first guide rail 4335. The second guide rail 4336 is arranged along the second direction and is fixed on the first mounting seat 4331; the second slider 4334 is slidably mounted on the second guide rail 4336.

[0126] Reference Figure 2 As an optional solution, it also includes a blowing component 3, which is used to blow air toward the battery cell 1 to eliminate the stress between the last layer 14 of the end diaphragm of the battery cell 1 and the adjacent layer 15.

[0127] Specifically, the blowing assembly 3 blows air toward the battery cell 1 along the first direction. Exemplarily, the blowing assembly 3 includes an air nozzle, which is arranged at one end of the battery cell 1 along the first direction where the opening end of the tail diaphragm is arranged, and the air nozzle blows air toward the battery cell 1. Optionally, the blowing assembly 3 includes a fan.

[0128] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0129] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect" and "connect" should be understood in a broad sense. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0130] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A method for disassembling a battery cell, characterized in that: include: Step 1: blowing air between the last layer of the finishing diaphragm of the battery cell and the adjacent layer to eliminate the stress between the last layer of the finishing diaphragm of the battery cell and the adjacent layer, wherein the last layer of the finishing diaphragm is the outermost diaphragm of the battery cell, and the adjacent layer is a diaphragm adjacent to the last layer of the finishing diaphragm; Step 2: Use an adhesive tape longer than the first dimension to adhere the last layer of the end diaphragm, move the portion where the adhesive tape is adhered to the last layer of the end diaphragm, so that the gap between the last layer of the end diaphragm and the adjacent layer becomes larger, and the first dimension is the width of the diaphragm after expansion; Step 3: cutting the last layer of the finishing diaphragm to obtain the beginning of the diaphragm separated from the opening end of the finishing diaphragm, wherein the opening end of the finishing diaphragm is the end of the diaphragm bonded with the tape; Step 4: Cut off at least part of the external connection portion, where the external connection portion is the portion of the adhesive tape that is not bonded to the last layer of the finishing diaphragm.

2. The battery cell disassembly method according to claim 1, characterized in that: The method of sticking the adhesive tape to the last layer of the finishing diaphragm and moving the portion where the adhesive tape is stuck to the last layer of the finishing diaphragm comprises: Step a: clamping the external connection portion and moving it to a set position above the last layer of the finishing diaphragm, keeping the clamped portion of the adhesive tape fixed; Step b: driving the portion of the adhesive tape located directly above the last layer of the finishing diaphragm to move and adhere to the finishing diaphragm, and at this time, the adhesive tape undergoes elastic deformation; Step c: removing the driving pressure on the portion of the adhesive tape located directly above the last layer of the finishing diaphragm, and allowing the adhesive tape to recover its deformation and move with the last layer of the finishing diaphragm to increase the gap between the last layer of the finishing diaphragm and the adjacent layer.

3. The battery cell disassembly method according to claim 2, characterized in that: In step a, the gap between the adhesive tape and the last layer of the finishing diaphragm is between 10 mm and 35 mm.

4. The battery cell disassembly method according to claim 1, characterized in that: The method of sticking the last layer of the finishing diaphragm with the adhesive tape in step 2 includes: Step m: clamping the external connection portion and moving it to a set position above the last layer of the finishing diaphragm; Step n: driving the adhesive tape to move toward the last layer of the finishing diaphragm to be bonded with the last layer of the finishing diaphragm.

5. The battery cell disassembly method according to claim 4, characterized in that: Also includes a step o after step n; The step o is to pressurize the contact portion between the adhesive tape and the last layer of the finishing diaphragm so that the adhesive tape and the last layer of the finishing diaphragm are closely attached.

6. The battery cell disassembly method according to claim 4 or 5, characterized in that: The method of moving the portion where the adhesive tape is bonded to the last layer of the finishing diaphragm in step 2 comprises: The external connection portion is lifted in a direction away from the last layer of the finishing diaphragm, and the adhesive tape moves with the last layer of the finishing diaphragm to increase the gap between the last layer of the finishing diaphragm and the adjacent layer.

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