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CN-117628844-B - Drying device for lithium battery cell production and precise forming process thereof

CN117628844BCN 117628844 BCN117628844 BCN 117628844BCN-117628844-B

Abstract

The invention discloses a drying device for lithium battery cell production and a precise forming process thereof, belonging to the technical field of lithium batteries, and comprising a box body, a plurality of air inlet clapboards arranged in the box body and a hot air drying assembly, wherein the air inlet clapboards are stacked up and down, a gas distribution cavity is formed in the inner layer of the air inlet clapboards, an arc-shaped containing cavity is formed by inward recessing of the outer wall of the air inlet clapboards, and the arc-shaped containing cavities of two adjacent air inlet clapboards are matched with each other and form a cell drying channel capable of containing a cylindrical cell; the hot air outlet of the hot air drying assembly is communicated with the air distribution cavities of the air inlet clapboards, a plurality of air holes are formed in the inner wall of the arc-shaped containing cavity, and the electric core drying channel is communicated with the corresponding air distribution cavities through the air holes. The invention improves the drying uniformity of the moisture on the surface of the battery cell, improves the drying efficiency, ensures the production and preparation performances of the battery cell, and further improves the stability, the safety and the service life of the battery cell.

Inventors

  • WANG MENG

Assignees

  • 无锡新奥龙金属制品有限公司

Dates

Publication Date
20260505
Application Date
20231116

Claims (8)

  1. 1. The drying device for the lithium battery cell production is characterized by comprising a box body (1), a plurality of air inlet partition boards (2) and hot air drying assemblies (3) which are arranged in the box body (1), wherein the air inlet partition boards (2) are stacked up and down, an air distribution cavity (21) is formed in the inner layer of the air inlet partition boards (2), an arc-shaped containing cavity (22) is formed in the inner wall of the air inlet partition boards (2) in an inward concave manner, the arc-shaped containing cavities (22) of two adjacent air inlet partition boards (2) are matched, and form a cell drying channel (23) capable of containing a cylindrical cell, a hot air outlet of each hot air drying assembly (3) is communicated with the air distribution cavity (21) of each air inlet partition board (2), a plurality of air holes (221) are formed in the inner wall of each arc-shaped containing cavity (22), and the cell drying channel (23) is communicated with the corresponding air distribution cavity (21) through the air holes (221); A rubber roller (27) is arranged on the inner wall of the arc-shaped containing cavity (22) which is positioned at the top in the electric core drying channel (23), a second notch (223) for installing the rubber roller (27) is formed in the inner wall of the arc-shaped containing cavity (22), the rubber roller (27) is rotationally connected in the second notch (223), and the rubber roller (27) is in butt joint with the outer wall of the electric core; A lifting stacking mechanism (4) is arranged between the air inlet partition plate (2) and the box body (1), the lifting stacking mechanism (4) comprises a lifting oil cylinder (41) and a plurality of guide rods (42), the lifting oil cylinder (41) is fixed on the top wall of the box body (1), a piston rod of the lifting oil cylinder (41) penetrates through the box body (1) and is fixedly connected with the top wall of the air inlet partition plate (2) at the topmost layer, the guide rods (42) are vertically and fixedly arranged in the box body (1), a guide pipe (43) is fixedly arranged on the outer wall, close to the guide rods (42), of each air inlet partition plate (2), the guide pipe (43) is sleeved outside the guide rods (42) in a sliding mode, the air inlet partition plate (2) at the bottommost position is fixed in the box body (1), and a lifting rope (44) is connected between the guide pipes (43) on the other adjacent air inlet partition plates (2) except the air inlet partition plates (2) at the bottommost position; The battery cell deflection mechanism (5) is arranged in the box body (1), and the output end of the battery cell deflection mechanism (5) is connected with the rubber roller (27) to drive the rubber roller (27) to rotate, so that each battery cell is driven to deflect circumferentially.
  2. 2. The drying device for lithium battery cell production is characterized in that the diameter of a cell drying channel (23) is larger than that of a cell, two overhead supporting pieces (25) are arranged on the inner wall of an arc-shaped containing cavity (22) which is positioned at the bottom of the cell drying channel (23) relatively, the overhead supporting pieces (25) are symmetrically arranged on two sides of the bottom of the cell, the cell is connected with the arc-shaped containing cavity (22) through the overhead supporting pieces (25), when the cell is positioned in the cell drying channel (23), the cell and the cell drying channel (23) are coaxial, and a drying air film is reserved between the outer wall of the cell and the inner wall of the cell drying channel (23).
  3. 3. The drying device for lithium battery cell production of claim 2, wherein when a plurality of cells are placed in the cell drying channel (23) for drying, an overhead ball (26) is arranged between two adjacent cells, and the inside of the overhead ball (26) is hollow and the surface of the overhead ball is provided with a plurality of perforations.
  4. 4. The drying device for lithium battery cell production according to claim 2, wherein sealing elements (24) are arranged on two sides of each cell drying channel (23), the sealing elements (24) are located between two adjacent air inlet partition boards (2), the sealing elements (24) are composed of two sealing long gaskets, the two sealing long gaskets are abutted tightly, and the sealing long gaskets are fixedly connected with the outer walls of the adjacent air inlet partition boards (2).
  5. 5. The drying device for lithium battery cell production according to any one of claims 2-4, wherein the overhead supporting piece (25) comprises a core bar (251), a plurality of sleeves (252) and a plurality of supporting blocks, a first notch (222) is formed in the inner wall of the arc-shaped containing cavity (22) which is relatively positioned at the bottom in the cell drying channel (23), the supporting blocks are positioned in the first notch (222) and fixedly connected with the inner walls at two sides of the first notch (222), the core bar (251) is arranged in each supporting block in a penetrating manner and fixedly connected with the supporting blocks, and the sleeves (252) are positioned between two adjacent supporting blocks and sleeved outside the core bar (251).
  6. 6. The drying device for lithium battery cell production according to claim 5, wherein the cell deflection mechanism (5) comprises a synchronizing rod (52), a sliding oil cylinder (51) and a plurality of driving sliding rods (53), each driving sliding rod (53) penetrates through the corresponding air inlet partition plate (2) and is connected with the air inlet partition plate (2) in a sliding mode, the sliding direction between the driving sliding rods (53) and the air inlet partition plate (2) is perpendicular to the axial direction of the cell drying channel (23), an incomplete tooth part (271) is formed on the outer peripheral surface of the rubber roller (27) positioned inside the air inlet partition plate (2), a ruler strip part (54) meshed with the incomplete tooth part (271) is formed at the bottom of the driving sliding rod (53) close to the rubber roller (27), one end of each driving sliding rod (53) penetrates out of the air inlet partition plate (2) and is connected with the synchronizing rod (52) in a sliding mode, the sliding direction of the driving sliding rod (53) is identical to the lifting direction of the air inlet partition plate (2), the sliding oil cylinder (51) is fixed to the outer wall (1), and the sliding oil cylinder (51) is connected with the piston rod (252) in a sliding mode, and the piston rod (252) is connected with the piston rod (251) in a penetrating mode.
  7. 7. The drying device for lithium battery cell production of claim 6, wherein support columns (66) are arranged at two ends of one side, close to a feed inlet of the box body (1), the box body (1) is connected with the support columns (66) in a pivoted mode, the support columns (66) are horizontally arranged with the rotating axis of the box body (1), a lifting mechanism (6) is arranged on the bottom surface, far away from the support columns (66), of the box body (1), the lifting mechanism (6) comprises a driving oil cylinder (61), a first connecting rod (62), a second connecting rod (63), a first connecting seat (64) and a second connecting seat (65), one end of the first connecting rod (62) is hinged to the bottom surface of the box body (1), the other end of the second connecting rod (63) is hinged to the second connecting seat (65), the cylinder body of the driving oil cylinder (61) is hinged to the first connecting seat (64), and one end of the driving oil cylinder (61) is hinged to the second connecting rod (63).
  8. 8. The precise forming process of the lithium battery cell is characterized by comprising the following steps of: s1, winding, namely respectively welding a positive electrode tab and a negative electrode tab on different pole pieces to obtain a positive electrode piece and a negative electrode piece, and winding the positive electrode piece, the diaphragm, the negative electrode piece and the diaphragm to prepare a cylindrical battery core matrix after the positive electrode piece, the diaphragm, the negative electrode piece and the diaphragm are put in sequence; s2, packaging, namely packaging the battery cell matrix into a battery cell shell, and processing the battery cell shell by rolling grooves to enable the battery cell shell to be partially sunken, so that the stability between the battery cell matrix and the battery cell shell is ensured; s3, drying, namely drying the battery cell after the shell is assembled by using a drying device, wherein the drying device comprises the following steps of: a. The lifting mechanism (6) is started to enable a feed inlet of the box body (1) to incline upwards, and then the battery cells are arranged in the battery cell drying channel (23), the battery cells slide into the bottom end of the battery cell drying channel (23) under the action of dead weight and are stacked in sequence, and an overhead ball (26) is placed between two adjacent battery cells in the same battery cell drying channel (23); b. The lifting stacking mechanism (4) is started to drive the air inlet partition boards (2) to descend, so that the air inlet partition boards (2) are stacked, and the rubber roller (27) is abutted with the battery cell; c. The hot air drying assembly (3) guides hot air into the air distribution cavities (21) of the air inlet partition boards (2), and the hot air flows into the electric core drying channels (23) through the air holes (221) to dry the electric cores, so that the surface moisture of the electric cores is removed; d. in the process of carrying out hot air drying on the battery core, the battery core deflection mechanism (5) is started and can drive the circumferential position of the battery core in the battery core drying channel (23) to deflect at a certain angle; e. After the hot air drying is finished, the lifting stacking mechanism (4) drives the air inlet partition board (2) to move upwards, so that the rubber roller (27) is separated from the battery cell, and then the lifting mechanism (6) is started, so that the feeding port of the box body (1) is inclined downwards, and the discharging of the battery cell is finished; s4, injecting electrolyte into the dried battery cell; And S5, packaging, namely welding the caps on the positive electrode tab and the negative electrode tab, and sealing by using a sealing machine to complete the assembly of the battery cell.

Description

Drying device for lithium battery cell production and precise forming process thereof Technical Field The invention relates to the technical field of lithium batteries, in particular to a drying device for producing a lithium battery cell and a precise forming process thereof. Background Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a positive/negative electrode material. The lithium battery mainly comprises a battery core and a protection board, wherein the protection board mainly comprises a protection chip, an MOS tube, a resistor, a capacitor and a PCB (printed circuit board), and the battery core is equivalent to a heart of the lithium battery and mainly comprises an anode material, a cathode material, electrolyte, a diaphragm and a shell. The lithium battery is widely applied to the fields of electric vehicles, energy storage systems, digital equipment, military products and the like due to the advantages of high energy ratio, environmental protection and the like. Cell injection is one of the key links in the production and preparation process of cylindrical cells, and the cells are usually required to be dried before cell injection so as to remove moisture on the surfaces of the cells. Otherwise, residual moisture after the battery cell is packaged can cause problems of corrosion, short circuit and the like on the battery cell, and the performance and the safety of the battery are affected. Therefore, the uniformity of materials in the battery core can be improved by drying the battery core before filling the battery core, the performance and the cycle life of the battery are improved, the probability of thermal runaway of the battery is reduced, and the stability and the safety of the battery are improved. The current electric core is annotated the stoving processing before the liquid and is adopted and will wait to dry electric core stack in the material dish more, then place in the drying cabinet and carry out the mode of drying, because pile up each other between the electric core, and electric core and the contact of material dish etc. the contact cover face and the stoving speed and the effect of the face of exposing of electric core are obviously different, and the mode of increasing stoving time is through the increase more to guarantee the removal effect to moisture, lead to electric core surface moisture to dry unevenly and drying efficiency is low. Disclosure of Invention In order to improve the drying uniformity of the moisture on the surface of the battery cell, improve the drying efficiency, ensure the production and preparation performances of the battery cell, and improve the stability, the safety and the service life of the battery cell. The invention provides a drying device for lithium battery cell production and a precise forming process thereof. The technical scheme includes that the drying device for lithium battery cell production comprises a box body, a plurality of air inlet partition plates and hot air drying assemblies, wherein the air inlet partition plates and the hot air drying assemblies are arranged in the box body, the air inlet partition plates are stacked up and down, an air distribution cavity is formed in the inner layer of each air inlet partition plate, the outer walls of the air inlet partition plates are inwards sunken to form arc-shaped containing cavities, the arc-shaped containing cavities of two adjacent air inlet partition plates are matched with each other and form a cell drying channel capable of containing a cylindrical cell, a hot air outlet of each hot air drying assembly is communicated with the air distribution cavity of each air inlet partition plate, a plurality of air holes are formed in the inner wall of each arc-shaped containing cavity, and the cell drying channel is communicated with the corresponding air distribution cavity through the air holes. Further, the diameter of the electric core drying channel is larger than that of the electric core, two overhead supporting pieces are arranged on the inner wall of the arc-shaped accommodating cavity in the electric core drying channel, which is positioned at the bottom of the electric core, the overhead supporting pieces are symmetrically arranged on two sides of the bottom of the electric core, the electric core is connected with the arc-shaped accommodating cavity through the overhead supporting pieces, when the electric core is positioned in the electric core drying channel, the electric core and the electric core drying channel are coaxial, and a drying air film is reserved between the outer wall of the electric core and the inner wall of the electric core drying channel. Further, when a plurality of electric cores are placed in the electric core drying channel for drying, an overhead ball is arranged between two adjacent electric cores, and a plurality of perforations are formed in the hollow inner part and the surfa