CN219226357U

CN219226357U - Electric core hot press device

Info

Publication number: CN219226357U
Application number: CN202222552985.1U
Authority: CN
Inventors: 余莹
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2022-09-26
Filing date: 2022-09-26
Publication date: 2023-06-20
Anticipated expiration: 2032-09-26

Abstract

The utility model provides a hot pressing device for an electric core, and belongs to the technical field of new energy battery production equipment. The electric core hot pressing device comprises a bottom plate, a top plate, a supporting column, a pressing plate frame, a hot pressing plate and a driving mechanism. The top plate is connected with the bottom plate through the support column, the driving mechanism is arranged on the top plate, the pressing plate frame is located between the bottom plate and the top plate and connected with the driving mechanism, the inner ring of the pressing plate frame comprises a first side, a second side, a third side and a fourth side which are sequentially and vertically connected, the hot pressing plate is parallel to the bottom plate, two ends of the hot pressing plate are respectively connected with the first side and the third side, and gaps are reserved between the hot pressing plate and the second side and between the hot pressing plate and the fourth side. The electric core hot pressing device can prevent the inner ring pole piece at the arc angle position of the electric core from crease, coating falling and other phenomena during hot pressing, and improves the yield of the electric core.

Description

Electric core hot press device

Technical Field

The utility model relates to the technical field of new energy battery production equipment, in particular to a hot pressing device for a battery cell.

Background

Problems such as environmental pollution and energy shortage are increasingly prominent in recent years. The lithium ion battery has been widely used in the fields of communication and electronic devices, energy storage power stations, new energy automobiles and the like because of the advantages of green environmental protection, high energy density, low self discharge, long cycle life and the like, and plays an important role in improving the energy utilization rate and protecting the environment.

The main structure of the lithium ion battery comprises an anode pole piece, a cathode pole piece, a separation film, electrolyte, an outer packaging shell and the like. The cathode pole piece, the anode pole piece and the isolating film are alternately wound together to form a battery core, and the battery core is packaged by outer packaging and liquid injection, and then the battery core is formed into a complete lithium ion battery through the procedures of capacity formation and the like. In order to improve the volume energy density of the lithium ion battery, the related technology generally carries out hot press shaping on the battery core, reduces the thickness of the battery core, discharges internal air and eliminates wrinkles so as to meet the production requirements of subsequent procedures.

Conventional hot pressing equipment in the related art directly carries out hot pressing to the battery cell by utilizing an upper hot plate and a lower hot plate, when the hot plate contacts with the arc angle positions on two sides of the battery cell, the phenomenon that a pole piece of an inner ring of the battery cell at the position generates folds, a pole piece coating falls off and the like can be caused, the poor probability of the voltage withstanding test of the winding core can be increased, and the risks of short circuit, explosion and the like of a battery can be caused in the later working procedure when the voltage withstanding test is serious.

Disclosure of Invention

The embodiment of the utility model provides a hot pressing device for a battery cell, which can prevent the phenomena of crease, coating falling and the like of an inner ring pole piece at the arc angle position of the battery cell during hot pressing, and improve the yield of the battery cell. The technical scheme is as follows:

the embodiment of the utility model provides a hot pressing device for a battery cell, which comprises:

a bottom plate, a top plate, a support column, a pressing plate frame, a hot pressing plate and a driving mechanism,

the top plate is arranged at intervals in parallel with the bottom plate and is connected with the support columns, the driving mechanism is arranged on the top plate, the pressing plate frame is located between the bottom plate and the top plate and is connected with the driving mechanism, the driving mechanism is configured to drive the pressing plate frame to lift between the bottom plate and the top plate, the inner ring of the pressing plate frame comprises a first side, a second side, a third side and a fourth side which are sequentially and vertically connected, the hot pressing plate is parallel with the bottom plate, two ends of the hot pressing plate are respectively connected with the first side and the third side, and gaps are reserved between the hot pressing plate and the second side and between the fourth side.

Optionally, the hot pressing plate is detachably connected with the pressing plate frame.

Optionally, the outer ring end faces of the pressing plate frame opposite to the first side edge and the third side edge are respectively provided with a plurality of fixing bolt holes matched with the hot pressing plate, and the plurality of fixing bolt holes are uniformly arranged at intervals.

Optionally, four support columns are arranged between the bottom plate and the top plate, and the four support columns are arranged in a rectangular array.

Optionally, four sliding sleeves corresponding to the four support columns one by one are arranged on the frame of the pressing plate, and the four support columns penetrate through the corresponding sliding sleeves.

Optionally, the actuating mechanism includes servo motor and lead screw, the lead screw perpendicular to the bottom plate and one end with servo motor transmission is connected, be equipped with the screw thread through-hole on the clamp plate frame, the lead screw cooperation is worn to locate in the screw thread through-hole.

Optionally, the electric core hot pressing device comprises two groups of driving mechanisms, the servo motors in the two groups of driving mechanisms are symmetrically arranged relative to the central line of the top plate, and the pressing plate frame is provided with two threaded through holes corresponding to the two groups of driving mechanisms.

Optionally, a motor bracket is arranged on the top plate, and the servo motor is detachably mounted on the motor bracket.

The technical scheme provided by the embodiment of the utility model has the beneficial effects that at least:

after the battery cell is formed through the procedures of coating, rolling, slitting, tab forming, winding lamination and the like, the pole piece is conveyed to a bottom plate of a battery cell hot pressing device through a mechanical arm on a production line. After the battery cell is placed in place, the driving mechanism on the top plate is used for driving the pressing plate frame to descend, and the hot pressing plate connected to the inner ring of the pressing plate frame is driven to descend together to perform hot pressing on the battery cell on the bottom plate. Through setting up the clearance between hot clamp plate and second side and fourth side, the electric core is put in place the back, and the circular arc angle of electric core both sides falls respectively in above-mentioned two clearance is relative to the orthographic projection region of bottom plate. When the hot pressing plate carries out abutting hot pressing on the battery core, the positions of the arc angles positioned on the two sides of the battery core are respectively opposite to the gaps of the two battery cores. The arc angles at two sides of the battery cell can not be extruded by the hot pressing plate during hot pressing, the phenomena of crease, coating falling and the like of the inner ring pole piece at the arc angle position of the battery cell can be effectively relieved and prevented during hot pressing, and the yield of the battery cell after subsequent pressure-resistant test and the whole product is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a hot press device for a battery cell according to an embodiment of the present utility model;

fig. 2 is a schematic front view of a hot press device for a battery cell according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of the structure shown at A-A in FIG. 2;

fig. 4 is a partially enlarged schematic structural view as at B in fig. 3.

In the figure:

1-a bottom plate; 2-top plate; 3-supporting plates; 4-a platen frame; 5-a hot press plate; 6-a driving mechanism; 7-sliding the sleeve; 41-a first side; 42-a second side; 43-third side; 44-fourth side; 45-fixing bolt holes; 46-threaded through holes; 61-a servo motor; 62-screw rod; 63-a motor bracket; an m-cell; m 1-arc angle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings.

Conventional hot pressing equipment in the related art directly carries out hot pressing on the battery cell by utilizing an upper hot plate and a lower hot plate, when the hot plates contact arc angle positions on two sides of the battery cell, the phenomena of crease generation of a pole piece of an inner ring of the battery cell at the position, falling of a pole piece coating and the like can be caused, the probability of poor Hi-point test of the coil core can be increased, and the risks of short circuit, explosion and the like of a battery can be caused in a later procedure when serious.

Fig. 1 is a schematic perspective view of a hot press device for a battery cell according to an embodiment of the present utility model. Fig. 2 is a schematic front view of a hot press device for a battery cell according to an embodiment of the present utility model. Fig. 3 is a schematic cross-sectional view of the structure shown at A-A in fig. 2. Fig. 4 is a partially enlarged schematic structural view as at B in fig. 3. As shown in fig. 1 to 4, in practice, the applicant provides a cell hot press apparatus comprising a base plate 1, a top plate 2, support columns 3, a press plate frame 4, a hot press plate 5 and a driving mechanism 6.

Wherein, roof 2 and bottom plate 1 parallel interval arrangement just pass through support column 3 connection, and actuating mechanism 6 sets up on roof 2. The platen frame 4 is located between the bottom plate 1 and the top plate 2 and is connected to a drive mechanism 6, the drive mechanism 6 being configured to be able to drive the platen frame 4 to rise and fall between the bottom plate 1 and the top plate 2. The inner ring of the pressing plate frame 4 comprises a first side 41, a second side 42, a third side 43 and a fourth side 44 which are sequentially and vertically connected, the hot pressing plate 5 is parallel to the bottom plate 1, two ends of the hot pressing plate are respectively connected with the first side 41 and the third side 43, and gaps are reserved between the hot pressing plate 5 and the second side 42 and between the hot pressing plate and the fourth side 44.

In the implementation of the utility model, after the battery cell m is formed through the procedures of coating, rolling, slitting, tab forming, winding lamination and the like, the pole piece is conveyed to the bottom plate 1 of the battery cell hot pressing device through a mechanical arm on a production line. After the electric core m is placed in place, the driving mechanism 6 on the top plate 2 is used for driving the pressing plate frame 4 to descend, and the hot pressing plate 5 connected to the inner ring of the pressing plate frame 4 is driven to descend together to carry out hot pressing on the electric core m on the bottom plate 1. By providing a gap between the hotplate 5 and the second and

fourth sides

42, 44, the circular arc angles m1 on both sides of the cell m after the cell m is placed in place respectively fall within the forward projection areas of the two gaps with respect to the base plate 1. When the hot press plate 5 performs contact hot press on the battery cell m, the positions of the arc angles m1 positioned on both sides of the battery cell m are respectively opposite to the two gaps. The arc angles m1 on two sides of the battery cell m can not be extruded by the hot pressing plate 5 during hot pressing, the phenomena of crease, coating falling and the like of the inner ring pole piece at the position of the arc angle m1 of the battery cell can be effectively relieved and prevented during hot pressing, and the yield of the battery cell after subsequent pressure-resistant test and the whole product is improved.

Optionally, the hot pressing plate 5 is detachably connected with the pressing plate frame 4. In the embodiment of the utility model, the overall width and the dimensions of the arc angles m1 on both sides in the length direction of the battery cells m with different specifications are different. Through setting up hot pressing board 5 to with clamp plate frame 4 detachable connected mode, correspond electric core m of different specifications, can correspond to change not unidimensional hot pressing board 5 and carry out corresponding processing, make and flow sufficient clearance between hot pressing board 5 and second side 42 and the fourth side 44 and dodge circular arc angle m1 position, improved electric core hot press unit's suitability.

Optionally, the outer ring end faces of the platen frame 4 opposite to the first side edge 41 and the third side edge 43 are respectively provided with a plurality of fixing bolt holes 45 matched with the hot pressing plate 5, and the plurality of fixing bolt holes 45 are uniformly arranged at intervals. Illustratively, in the embodiment of the present utility model, the corresponding assembly end surface of the hot platen 5 is provided with a bolt countersink (not shown in the figure) corresponding to the fixing bolt hole 45, and the hot platen 5 may be fixed in the platen frame 4 by screwing the fastening bolt from the outer ring end surface of the platen frame 4. And through setting up a plurality of fixed bolt holes 45 in the interval, the hot pressing plate 5 to different width sizes all can use corresponding fixed bolt hole 45 to cooperate the assembly, has further improved electric core hot press unit's suitability.

Optionally, four support columns 3 are arranged between the bottom plate 1 and the top plate 2, and the four support columns 3 are arranged in a rectangular array. In the embodiment of the utility model, the bottom plate 1 and the top plate 2 are square, the four support columns 3 are arranged in a rectangular array to support and fix the top plate 2 at four corners of the bottom plate 1, the four support columns 3 are uniformly stressed and stably supported, and the assembly stability of the cell hot-pressing device is effectively improved.

Optionally, four sliding sleeves 7 corresponding to the four support columns 3 one by one are arranged on the pressing plate frame 4, and the four support columns 3 are arranged in the corresponding sliding sleeves 7 in a penetrating mode. Illustratively, in the present embodiment, the sliding sleeves 7 are provided on the platen frame 4 to be cooperatively connected with the four support columns 3. When the driving mechanism 6 is utilized to drive the pressing plate frame 4 to lift, the four support columns 3 can also limit and guide the lifting path of the pressing plate frame 4 and the hot pressing plate 5 in the vertical direction perpendicular to the bottom plate 1, so that the hot pressing plate 5 can stably descend to the top hot pressing position of the battery cell m for hot pressing, hot pressing machining size deviation is avoided, and machining accuracy of the battery cell hot pressing device is further improved.

Optionally, the driving mechanism 6 includes a servo motor 61 and a screw rod 62, the screw rod 62 is perpendicular to the base plate 1, one end of the screw rod 62 is in transmission connection with the servo motor 61, the platen frame 4 is provided with a threaded through hole 46, and the screw rod 62 is matched and penetrated in the threaded through hole 46. Illustratively, in the embodiment of the present utility model, the output shaft of the servo motor 61 rotates to drive the screw rod 62 in driving connection with the screw rod to rotate, the screw rod 62 is cooperatively connected with the platen frame 4 through the threaded through hole 46 to form a screw rod sportswear, and the whole platen frame 4 can be driven to lift along the axis direction of the screw rod 62, namely, the vertical direction through clockwise or anticlockwise rotation of the screw rod 62. Compared with the mode of directly utilizing telescopic link drive through cylinder or electric cylinder, adopt the driving mode of lead screw sportswear to drive the lift of clamp plate frame 4 and hot pressboard 5, transmission efficiency is higher, and servo motor 61's drive power also can be corresponding setting less, more energy saving and consumption reduction can effectively reduce electric core hot press device's working operation cost.

Alternatively, the cell hot press device comprises two groups of driving mechanisms 6, the servo motors 61 in the two groups of driving mechanisms 6 are symmetrically arranged relative to the central line of the top plate 2, and the press plate frame 4 is provided with two threaded through holes 46 corresponding to the two groups of driving mechanisms 6. In the embodiment of the utility model, the lifting of the pressing plate frame 4 is driven by the two groups of symmetrically arranged driving mechanisms 6, so that the stress points of the matched connection of the pressing plate frame 4 and the driving mechanisms 6 are more average, the damage caused by the over-high stress of a single stress point in the lifting process can be avoided, and the overall service life of the electric core hot pressing device is effectively prolonged.

Optionally, a motor bracket 63 is provided on the top plate 2, and the servo motor 61 is detachably mounted on the motor bracket 63. Illustratively, in the embodiment of the present utility model, by providing the additional motor support 63 to detachably mount the servo motor 61, the direct contact between the servo motor 61 and the top plate 2 can be avoided, and the vibration generated when the servo motor 61 works can be buffered. Meanwhile, the servo motor 61 is conveniently taken down for maintenance and replacement when not in use, and the overall service life of the cell hot-pressing device is further prolonged.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships, which may also change accordingly when the absolute position of the object to be described changes.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model, but rather, the utility model is to be construed as limited to the appended claims.

Claims

1. A cell hot press device, comprising: a bottom plate (1), a top plate (2), a support column (3), a pressing plate frame (4), a hot pressing plate (5) and a driving mechanism (6),

roof (2) with bottom plate (1) parallel interval arrangement just passes through support column (3) are connected, actuating mechanism (6) set up in on roof (2), clamp plate frame (4) are located bottom plate (1) with between roof (2) and with actuating mechanism (6) are connected, actuating mechanism (6) are configured to can drive clamp plate frame (4) bottom plate (1) with go up and down between roof (2), the inner circle of clamp plate frame (4) is including first side (41), second side (42), third side (43) and fourth side (44) that connect perpendicularly in proper order, hot pressboard (5) with bottom plate (1) are parallel and both ends respectively with first side (41) with third side (43) are connected, hot pressboard (5) with second side (42) with all have the clearance between fourth side (44).

2. The cell hot press device according to claim 1, wherein the hot press plate (5) is detachably connected to the press plate frame (4).

3. The cell hot press device according to claim 2, wherein the outer ring end faces of the pressing plate frame (4) opposite to the first side edge (41) and the third side edge (43) are respectively provided with a plurality of fixing bolt holes (45) matched with the hot press plate (5), and the plurality of fixing bolt holes (45) are uniformly arranged at intervals.

4. The cell hot press device according to claim 1, wherein four support columns (3) are arranged between the bottom plate (1) and the top plate (2), and the four support columns (3) are arranged in a rectangular array.

5. The cell hot press device according to claim 4, wherein four sliding sleeves (7) corresponding to the four support columns (3) one by one are arranged on the pressing plate frame (4), and the four support columns (3) are arranged in the corresponding sliding sleeves (7) in a penetrating manner.

6. The hot press device for the electric core according to claim 1, characterized in that the driving mechanism (6) comprises a servo motor (61) and a screw rod (62), the screw rod (62) is perpendicular to the bottom plate (1) and one end of the screw rod is in transmission connection with the servo motor (61), a threaded through hole (46) is formed in the pressing plate frame (4), and the screw rod (62) is matched and penetrated in the threaded through hole (46).

7. The cell hot press device according to claim 6, characterized in that it comprises two sets of said driving mechanisms (6), said servomotors (61) of both sets of said driving mechanisms (6) being symmetrically arranged with respect to the midline of said top plate (2), said platen frame (4) having two said threaded through holes (46) corresponding to both sets of said driving mechanisms (6).

8. The cell hot press device according to claim 7, wherein a motor bracket (63) is provided on the top plate (2), and the servo motor (61) is detachably mounted on the motor bracket (63).