Lithium ion battery fully-charged pole piece processing device and method

Abstract

The invention discloses a lithium ion battery fully-charged pole piece processing device and method. The treatment device comprises a discharge tank, a partition plate used for dividing the discharge tank into a working bin and a replacement bin is arranged in the discharge tank, a through hole is formed in the upper portion of the partition plate, the working bin and the replacement bin are each internally provided with a discharge assembly, and lifting assemblies used for controlling the two discharge assemblies to move reversely are arranged at the bottoms of the discharge assemblies. The treatment method comprises the following steps: respectively winding the positive pole piece and the negative pole piece on the two winding columns of the working bin, and injecting electrolyte into the replacement bin at the same time; the lifting plates in the replacement bin and the working bin are controlled to lift reversely, and the electrolyte flows into the working bin from the replacement bin through the through holes; the positive and negative pole pieces are electrically connected with an electric energy recovery device, discharge current is set, and electric energy release and recovery are achieved; and when the electric energy is recovered, winding or unloading operation of the positive and negative pole pieces is carried out. According to the invention, the treatment of the fully-charged negative pole piece can be efficiently and safely completed, and the recycling of the negative pole piece and the energy recovery are realized.

Description

Technical Field

[0001] The present invention relates to an electrode sheet recycling device and method, and in particular to a lithium ion battery fully charged electrode sheet processing device and method. Background Art

[0002] During the development and production of lithium-ion batteries, follow-up inspections are conducted on the process performance and process performance of cells made with new formulas or new materials and abnormal cells in mass production. The method usually adopted is to fully charge and disassemble the cells after formation or capacity separation. The state of the negative electrode surface of the battery in the fully charged state is a key indicator. When abnormal conditions such as black spots, lithium precipitation, and wrinkles appear, the cell design is adjusted in time to avoid greater losses.

[0003] The fully charged negative electrode plates are highly active and prone to spontaneous combustion when the air humidity is high. If the disassembled plates are directly transferred to the outdoor environment, spontaneous combustion will occur, posing a safety hazard. The gases produced during the combustion process will also pollute the environment, so the negative electrode plates need to be processed before being transferred outdoors. The conventional practice is to transfer the fully charged negative electrode plates to an incineration tower for incineration, but the daily operation and maintenance costs of the incineration tower are high, and only the copper current collector of the negative electrode plates after incineration can be recycled, resulting in a waste of resources.

[0004] In response to the above problems, Chinese patent CN208820021U discloses a negative electrode plate processing device that can accurately control the oxidation rate of the negative electrode plate, making it inactive and preventing the negative electrode plate from spontaneously igniting. Ultimately, the safe treatment and secondary recycling of the negative electrode plate are achieved. However, the device has a complex structure and hydrogen is produced during the treatment process, which still poses a safety hazard. In addition, the device is a closed structure, and the fully charged plate cannot be replaced synchronously during the reaction process. Production needs to be carried out batch by batch, and the production efficiency is low. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a device for processing fully charged electrodes of lithium-ion batteries, so as to solve the problem that the existing recycling and processing devices cannot continuously load and unload materials between batches and have low production efficiency; another purpose of the present invention is to propose a method for processing fully charged electrodes of lithium-ion batteries, so as to solve the problem of how to recycle the materials and energy of negative electrode electrodes.

[0006] Technical solution: The present invention discloses a device for processing fully charged pole pieces of lithium-ion batteries, comprising a discharge tank, wherein a partition is provided in the discharge tank for dividing the discharge tank into a working chamber and a replacement chamber, a through hole is provided on the upper part of the partition for connecting the working chamber and the replacement chamber, and a group of discharge components for pole piece discharge operation are sealed and slidably connected in each of the working chamber and the replacement chamber, and a lifting component is provided at the bottom of the discharge component for controlling the reverse movement of the two groups of discharge components.

[0007] Preferably, the discharge assembly includes a lifting plate that is sealingly and slidingly connected to the inner wall of the discharge groove and the partition, the lifting plate is sealed with a support frame, a diaphragm is provided in the support frame, the discharge groove and the partition are correspondingly provided with slots, both sides of the support frame are sealingly and slidingly connected in the slots, two sets of winding mechanisms are provided on the lifting plate, and the diaphragm is arranged between the two sets of winding mechanisms.

[0008] Preferably, the winding mechanism includes a winding column rotatably connected to the lifting plate, the winding column is provided with a slot, a first motor is provided at the bottom of the lifting plate, the lower end of the winding column is connected to the output shaft of the first motor, and the diaphragm is provided between the two winding columns.

[0009] Preferably, the lifting assembly includes a lifting column arranged at the bottom of the lifting plate, a rack is provided on the inner side of the lifting column, gears are meshed between the racks, a fixed box is provided at the bottom of the discharge tank, the gear is rotatably connected in the fixed box, a second motor is provided outside the fixed phase, and the rotating shaft of the gear is connected to the output shaft of the second motor.

[0010] The present invention further adopts the above device to process fully charged battery plates, and the specific method includes the following steps:

[0011] (1) Wind the disassembled positive and negative electrode sheets on the two winding rods in the working chamber respectively, and inject electrolyte into the replacement chamber at the same time;

[0012] (2) Open the lifting assembly, control the lifting plate in the replacement chamber to rise, and at the same time, the lifting plate in the working chamber to descend, and the electrolyte flows from the replacement chamber into the working chamber through the through hole until the electrolyte in the replacement chamber completely flows into the working chamber, and then close the lifting assembly;

[0013] (3) electrically connecting the wound positive and negative electrode sheets to an energy recovery device, setting a discharge current, and realizing energy release and recovery;

[0014] (4) While the electric energy is being recovered, the winding column in the replacement bin is fully raised to carry out the winding or unloading operation of the positive and negative electrode sheets. When the discharge operation in the working bin is completed, the lifting assembly is rotated in the reverse direction to repeat the discharge and unloading and winding operations alternately.

[0015] Preferably, in step (2), the lifting assembly controls the lifting plate in the replacement bin to rise, while the lifting plate in the working bin to descend by turning on the second motor, which drives the gear to rotate, and the gear drives the racks and lifting columns on both sides to move in the opposite direction, and the lifting columns drive the lifting plates in the working bin and the replacement bin to move in the opposite direction.

[0016] Preferably, in step (4), the unloading operation includes removing the positive and negative electrode sheets that have been inactivated after discharge from the winding column, pulling out the support frame upward along the slot, replacing the diaphragm in the support frame, and then resetting the support frame.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] (1) The fully charged electrode plate processing device and method proposed in the present invention can efficiently and safely complete the processing of fully charged negative electrode plates, thereby realizing the recycling and energy recovery of negative electrode plates.

[0019] (2) The present invention utilizes the working principle of the primary battery to transform a highly active fully charged negative electrode sheet into an uncharged negative electrode sheet. The device has the characteristics of simple structure, low manufacturing cost, and low equipment operation and maintenance cost. The device can recycle and store the electric energy released during the electrode sheet processing to reduce energy waste. The carbon material coated on the surface of the treated negative electrode sheet can be recycled for secondary use, while reducing environmental pollution caused by incineration, which helps to reduce production costs.

[0020] (3) The present invention can complete the loading and unloading operation of the next batch of electrode sheets while the fully charged electrode sheets are discharged, and realize continuous reaction between batches without waiting for the discharge process to be completed. It can also transfer the electrolyte for the discharge reaction of the next batch while separating the electrode sheets and electrolyte of the previous batch, which reduces the amount of electrolyte used and the pollution, and further improves the separation and loading efficiency of the electrolyte between batches, realizing seamless continuous reaction between different batches. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention from a bottom perspective;

[0022] Figure 2 It is a schematic diagram of the overall structure of the present invention from an upper perspective;

[0023] Figure 3 A top view of the present invention;

[0024] Figure 4 for Figure 3 Middle AA section view;

[0025] Figure 5 for Figure 3 Middle BB section view;

[0026] Among them, 1-discharge groove, 11-partition, 111-through hole, 12-slot, 13-working chamber, 14-replacement chamber, 2-lifting plate, 21-winding column, 211-slot, 212-first motor, 3-diaphragm, 31-support frame, 4-lifting column, 41-rack, 6-gear, 7-fixing box, 71-second motor. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0028] like Figure 1-4 As shown, a fully charged electrode plate processing device for a lithium-ion battery comprises a discharge tank 1, wherein a partition 11 is provided in the discharge tank 1 for dividing the discharge tank 1 into a working chamber 13 and a replacement chamber 14, and a through hole 111 is provided on the upper part of the partition 11 for connecting the working chamber 13 and the replacement chamber 14, wherein a group of discharge components for electrode plate discharge operation are sealed and slidably connected in each of the working chamber 13 and the replacement chamber 14, and a lifting component for controlling the reverse movement of the two groups of discharge components is provided at the bottom of the discharge component. The through hole 111 can be set to two, which are disposed on both sides of the diaphragm 3, so that the electrolyte can be transferred into both sides of the diaphragm 3 respectively.

[0029] In this embodiment, the discharge assembly includes a lifting plate 2 that is sealed and slidably connected to the inner wall of the discharge tank 1 and the partition 11, a support frame 31 is sealed and inserted on the lifting plate 2, a diaphragm 3 is arranged in the support frame 31, the discharge tank 1 and the partition 11 are correspondingly provided with slots 12, both sides of the support frame 31 are sealed and slidably connected in the slots 12, two groups of winding mechanisms are provided on the lifting plate 2, and the diaphragm 3 is arranged between the two groups of winding mechanisms. The sealed and detachable design of the support frame 31 frame, the partition 11 and the discharge tank 1 facilitates the replacement of the diaphragm 3. The edge of the support frame 31 may be provided with a card slot to facilitate the card connection and removal of the diaphragm 3.

[0030] In this embodiment, the winding mechanism includes a winding column 21 rotatably connected to the lifting plate 2, a slot 211 is provided on the winding column 21, a first motor 212 is provided at the bottom of the lifting plate 2, the lower end of the winding column 21 is connected to the output shaft of the first motor 212, and the diaphragm 3 is provided between the two winding columns 21. The slot 211 provided on the winding column 21 can fix the end of the pole piece, which is convenient for rapid winding and feeding.

[0031] In this embodiment, the lifting assembly includes a lifting column 4 disposed at the bottom of the lifting plate 2, a rack 41 is disposed inside the lifting column 4, a gear 6 is meshed between the racks 41, a fixed box 7 is disposed at the bottom of the discharge tank 1, the gear 6 is rotatably connected inside the fixed box 7, a second motor 71 is disposed outside the fixed box, and the rotating shaft of the gear 6 is connected to the output shaft of the second motor 71. The outer side of the lifting column 4 is slidably connected to the inner wall of the fixed box 7.

[0032] In this embodiment, the components such as the discharge tank 1, the partition 11, the support frame 31, the lifting plate 2 and the like are preferably made of a polymer material such as polypropylene that is resistant to acid and alkali corrosion.

[0033] The method for the above device to process fully charged battery plates is as follows:

[0034] (1) Winding the disassembled positive and negative electrode sheets on the two winding posts 21 of the working chamber 13 respectively, the method is: inserting one end of the electrode sheet into the clamping slot 211, turning on the first motor 212, driving the winding posts 21 to rotate, winding the electrode sheets layer by layer and fixing them on the winding posts 21, one winding post 21 is winding the positive electrode sheet, and the other winding post 21 is winding the negative electrode sheet. At the same time, only the electrolyte is injected into the replacement chamber 14;

[0035] (2) Turn on the second motor 71, the second motor 71 drives the gear 6 to rotate, the gear 6 drives the racks 41 on both sides and the lifting column 4 to move in the opposite direction, and the lifting column 4 drives the lifting plates 2 in the working chamber 13 and the replacement chamber 14 to make reverse lifting movements, that is, the lifting plate 2 in the replacement chamber 14 is controlled to rise, and the lifting plate 2 in the working chamber 13 is controlled to fall, so that the electrolyte flows from the replacement chamber 14 into the working chamber 13 through the through hole 111 until the electrolyte in the replacement chamber 14 completely flows into the working chamber 13, and then turn off the second motor 71; at this time, the winding column 21 and the diaphragm 3 in the replacement chamber 14 are completely exposed from the discharge slot 1, and the next batch of electrode winding operations can be carried out.

[0036] (3) The wound positive and negative electrode sheets are electrically connected to the energy recovery device through a wire, one end of the wire is connected to the energy recovery device, and the other end is provided with a clip to clamp the pole ears of the wound electrode sheet respectively; a discharge current is set to achieve energy release and recovery;

[0037] (4) While the electric energy is being recovered, the winding column 21 in the replacement bin 14 is fully raised to carry out the winding or unloading operation of the next batch of positive and negative electrode sheets. When the discharge operation in the working bin 13 is completed, the lifting assembly is rotated in the opposite direction to repeat the discharge and unloading winding operations alternately. During unloading, the positive and negative electrode sheets that have been inactivated after discharge are removed from the winding column 21, and then the support frame 31 is pulled out upward along the slot 12, and the diaphragm 3 in the support frame 31 is replaced and the support frame 31 is reset.

[0038] (5) The inactive electrode sheet and the diaphragm 3 are taken out and dried, and then recycled.

Claims

1. A lithium-ion battery fully charged electrode processing device, characterized in that: The invention comprises a discharge tank (1), wherein a partition (11) is provided in the discharge tank (1) for dividing the discharge tank (1) into a working chamber (13) and a replacement chamber (14), a through hole (111) is provided on the upper part of the partition (11) for connecting the working chamber (13) and the replacement chamber (14), a group of discharge components for pole piece discharge operation are each sealed and slidably connected in the working chamber (13) and the replacement chamber (14), and a lifting component for controlling the reverse movement of the two groups of discharge components is provided at the bottom of the discharge component.

2. The lithium-ion battery fully charged electrode processing device according to claim 1, characterized in that: The discharge assembly comprises a lifting plate (2) which is sealingly and slidably connected to the inner wall of the discharge tank (1) and the partition (11); a support frame (31) is sealingly inserted on the lifting plate (2); a diaphragm (3) is arranged in the support frame (31); slots (12) are correspondingly arranged on the discharge tank (1) and the partition (11); two sides of the support frame (31) are sealingly and slidably connected in the slots (12); two groups of winding mechanisms are arranged on the lifting plate (2); and the diaphragm (3) is arranged between the two groups of winding mechanisms.

3. The lithium-ion battery fully charged electrode processing device according to claim 2, characterized in that: The winding mechanism comprises a winding column (21) rotatably connected to the lifting plate (2), a clamping seam (211) is provided on the winding column (21), a first motor (212) is provided at the bottom of the lifting plate (2), the lower end of the winding column (21) is connected to the output shaft of the first motor (212), and the diaphragm (3) is arranged between the two winding columns (21).

4. The lithium-ion battery fully charged electrode processing device according to claim 2, characterized in that: The lifting assembly comprises a lifting column (4) arranged at the bottom of the lifting plate (2), a rack (41) is arranged on the inner side of the lifting column (4), a gear (6) is meshed between the racks (41), a fixed box (7) is arranged at the bottom of the discharge tank (1), the gear (6) is rotatably connected inside the fixed box (7), a second motor (71) is arranged outside the fixed box, and the rotating shaft of the gear (6) is connected to the output shaft of the second motor (71).

5. A method for processing fully charged battery electrodes using the device described in any one of claims 1 to 4, characterized in that: The steps include: (1) Wind the disassembled positive and negative electrode sheets on the two winding rods in the working chamber respectively, and inject electrolyte into the replacement chamber at the same time; (2) Open the lifting assembly, control the lifting plate in the replacement chamber to rise, and at the same time, the lifting plate in the working chamber to descend, and the electrolyte flows from the replacement chamber into the working chamber through the through hole until the electrolyte in the replacement chamber completely flows into the working chamber, and then close the lifting assembly; (3) electrically connecting the wound positive and negative electrode sheets to an energy recovery device, setting a discharge current, and realizing energy release and recovery; (4) While the electric energy is being recovered, the winding column in the replacement bin is fully raised to carry out the winding or unloading operation of the positive and negative electrode sheets. When the discharge operation in the working bin is completed, the lifting assembly is rotated in the reverse direction to repeat the discharge and unloading and winding operations alternately.

6. The method for processing a fully charged battery electrode according to claim 5, characterized in that: In step (2), the lifting assembly controls the lifting plate in the replacement bin to rise, while the lifting plate in the working bin to descend by turning on the second motor, which drives the gear to rotate, and the gear drives the racks and lifting columns on both sides to move in the opposite direction, and the lifting columns drive the lifting plates in the working bin and the replacement bin to move in the opposite direction.

7. The method for processing a fully charged battery electrode according to claim 6, characterized in that: In step (4), the unloading operation includes removing the positive and negative electrode sheets that have been inactivated after discharge from the winding column, then pulling out the support frame upward along the slot, replacing the diaphragm in the support frame, and then resetting the support frame.

Images