CN113594557A

CN113594557A - Multi-roll off-line lithium battery assembling device

Info

Publication number: CN113594557A
Application number: CN202110855007.1A
Authority: CN
Inventors: 王友路
Original assignee: Gotion High Tech Co Ltd
Current assignee: Gotion High Tech Co Ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-11-02
Anticipated expiration: 2041-07-28
Also published as: CN113594557B

Abstract

The invention relates to the field of battery assembly, in particular to an off-line assembly device for a multi-core lithium battery, comprising a bracket on which a cover plate support plate is horizontally arranged; A rotating shaft is fixedly arranged on the core plate, the rotating shaft is rotatably mounted on the bracket, the rotating shaft is set horizontally, and the rotating shafts on both sides of the cover plate support plate are parallel; The position between the support plate and the core plate, and the folding knife can rotate with the rotating shaft. The advantages of the present invention are: when using the multi-roll core lithium battery off-line assembly device, the operation is relatively convenient when the battery is assembled, and the device has the advantages of simple structure, high precision, low cost, convenient use and the like.

Description

Multi-roll off-line lithium battery assembling device

Technical Field

The invention relates to the field of battery assembly, in particular to an offline assembly device for a multi-roll-core lithium battery.

Background

The lithium battery assembly process is one of the key processes in the lithium battery manufacturing process, and the process forms a battery by combining a formed roll into a core, putting the core into a shell and welding the core. The core closing device is usually adopted to realize the core closing, for example, the chinese utility model patent with publication number CN208368654U discloses a core closing device of a lithium battery, which includes: the bottom plate, the core combining component and the gland component; the core combining component comprises an upright post and two core combining rods; the stand column is arranged on the bottom plate, the two core combining rods are rotatably arranged on the stand column and symmetrically arranged, and the middle parts of the core combining rods protrude towards the other core combining rod to form a station for placing the battery cell; the gland subassembly includes two air cylinder, two stroke cylinders, backup pad and support column of pushing down. The device can realize the core combination operation, but in the assembly of a plurality of winding cores, the battery thickness is increased and the tab length is increased due to the fact that the number of winding cores is large; the utmost point ear length is too big leads to utmost point ear to turn over easily, the damage etc. and the assembly is comparatively inconvenient, when rolling up core and battery cover plate welding back and going into the shell moreover, utmost point ear form is wayward, and the utmost point ear of overlength is easily inserted and is rolled up the inside battery short circuit that causes of core, can't drop into the volume production.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the technical problem of inconvenient battery assembly in the prior art.

The invention solves the technical problems through the following technical means: an off-line assembling device for a multi-winding-core lithium battery comprises a support, wherein a cover plate supporting plate is horizontally arranged on the support;

a core combining plate is respectively arranged at two sides of the cover plate supporting plate, a rotating shaft is fixedly arranged on the core combining plate, the rotating shaft is rotatably arranged on the bracket and horizontally arranged, and the rotating shafts at two sides of the cover plate supporting plate are parallel;

the folding knife is arranged on the rotating shaft in a sliding mode, can slide to the position between the cover plate supporting plate and the core combining plate along the axial direction of the rotating shaft, and can rotate along with the rotating shaft.

The off-line assembling device for the multi-roll-core lithium battery is mainly used for assembling a roll core and a cover plate in practical application, and the typical structure of the roll core and the cover plate is as follows: the apron is located the centre, and the both sides of apron respectively set up a set of book core, and every group includes two upper and lower superimposed book cores, and every group rolls up the core inboard and is provided with two utmost point ears, and utmost point ear is connected with the apron through the connection piece that corresponds respectively. When the device is in an initial state, the cover plate supporting plate and the core plates on two sides are in a horizontal state, the connected cover plate is placed on the cover plate supporting plate in the middle, the two groups of winding cores are respectively placed on the corresponding core plates, the folding knife is moved along the rotating shaft after the two groups of winding cores are placed at corresponding positions, the folding knife is moved to a position between the cover plate supporting plate and the core plates and is positioned outside the corresponding connecting sheet, after the folding knife is moved in place, the two core plates are pulled to rotate around the corresponding rotating shaft, the folding knife rotates along with the rotating shaft, the connecting sheet can be shifted to be bent when the folding knife rotates, the core plates are in a vertical state after being turned for 90 degrees, the two groups of winding cores are turned over and assembled, then the folding knife is withdrawn from the position and reset, the two core plates can be reset, when the device is used for assembling the multi-winding-core lithium battery, the operation is convenient, and the device has a simple structure, High precision, low cost, convenient use and the like.

Preferably, a roll core placing groove is formed in the core combining plate.

The improved folding knife is characterized in that a protruding strip is arranged on the rotating shaft and parallel to the rotating shaft, a groove matched with the protruding strip is formed in the folding knife, and the folding knife is slidably mounted on the rotating shaft and the protruding strip.

The sand grip can limit the circumferential rotation of the folding knife, so that the axial sliding of the folding knife on the rotating shaft is ensured, the circumferential rotation is avoided, the connecting piece can be bent when the folding knife moves, and the core closing operation is realized.

Preferably, the folding knife comprises a sliding block which is slidably mounted on the rotating shaft, and a folding blade is arranged on the sliding block and is of a long strip-shaped plate-shaped structure.

The optimized sliding block further comprises a shifting block which is slidably mounted on the support, and the sliding direction of the shifting block is parallel to that of the sliding block;

a shifting fork with an opening facing the sliding block is arranged on the shifting block, and the sliding block is positioned in the opening of the shifting fork;

and the support is provided with a shifting block driving mechanism.

The shifting block driving mechanism can drive the shifting block to slide, and then drives the shifting block to stir the sliding block to move, so that the folding knife is inserted and reset.

Optimally, two coaxial rotating shafts are arranged on each core combining plate, and the two rotating shafts corresponding to each core combining plate are respectively positioned at two sides of the core combining plate;

the two shifting blocks are respectively positioned between the rotating shafts at the same ends of the two core-combining plates, two shifting forks are respectively arranged on two sides of each shifting block, and the sliding blocks on two sides of each shifting block are respectively positioned in corresponding shifting fork openings;

the shifting block driving mechanism comprises a telescopic mechanism, the telescopic direction of the telescopic mechanism is perpendicular to the sliding direction of the shifting block, and the movable end of the telescopic mechanism is connected with the two shifting blocks through two connecting rods respectively.

When the movable end of the telescopic mechanism acts, the shifting block can be driven to do reciprocating motion through the connecting rod, so that the folding knife is driven to move, the automation degree is high, and the operation is convenient and reliable.

Preferably, the telescopic mechanism adopts a push rod motor or an air cylinder.

Preferably, the shifting fork is provided with a pair of rollers, the rotating axis of each roller is perpendicular to the sliding direction of the corresponding sliding block, and the sliding block is located between the two rollers on the corresponding shifting fork.

When closing the core operation, the pivot takes place to rotate, and the sword that rolls over can rotate along with the pivot simultaneously, and the setting of gyro wheel can become to slide for rolling, avoids slider and shift fork to take place sliding friction, and the slider rotates comparatively smoothly.

Optimally, the same gears are arranged on the rotating shafts, and the gears corresponding to the two core plates are meshed with each other.

Through gear engagement, when one of them core board that closes of can ensureing to overturn, another closes the core board and can overturn in step thereupon, and then ensures that two sets of book cores can synchronous operation realize closing the core.

Preferably, the gear is driven by a gear drive mechanism.

When the gear driving mechanism works, the two core plates can be driven by the gear to synchronously overturn, and the degree of automation is higher.

The invention has the advantages that:

1. the off-line assembling device for the multi-roll-core lithium battery is mainly used for assembling a roll core and a cover plate in practical application, and the typical structure of the roll core and the cover plate is as follows: the apron is located the centre, and the both sides of apron respectively set up a set of book core, and every group includes two upper and lower superimposed book cores, and every group rolls up the core inboard and is provided with two utmost point ears, and utmost point ear is connected with the apron through the connection piece that corresponds respectively. When the device is in an initial state, the cover plate supporting plate and the core plates on two sides are in a horizontal state, the connected cover plate is placed on the cover plate supporting plate in the middle, the two groups of winding cores are respectively placed on the corresponding core plates, the folding knife is moved along the rotating shaft after the two groups of winding cores are placed at corresponding positions, the folding knife is moved to a position between the cover plate supporting plate and the core plates and is positioned outside the corresponding connecting sheet, after the folding knife is moved in place, the two core plates are pulled to rotate around the corresponding rotating shaft, the folding knife rotates along with the rotating shaft, the connecting sheet can be shifted to be bent when the folding knife rotates, the core plates are in a vertical state after being turned for 90 degrees, the two groups of winding cores are turned over and assembled, then the folding knife is withdrawn from the position and reset, the two core plates can be reset, when the device is used for assembling the multi-winding-core lithium battery, the operation is convenient, and the device has a simple structure, High precision, low cost, convenient use and the like.

2. The sand grip can limit the circumferential rotation of the folding knife, so that the axial sliding of the folding knife on the rotating shaft is ensured, the circumferential rotation is avoided, the connecting piece can be bent when the folding knife moves, and the core closing operation is realized.

3. The shifting block driving mechanism can drive the shifting block to slide, and then drives the shifting block to stir the sliding block to move, so that the folding knife is inserted and reset.

4. When the movable end of the telescopic mechanism acts, the shifting block can be driven to do reciprocating motion through the connecting rod, so that the folding knife is driven to move, the automation degree is high, and the operation is convenient and reliable.

5. When closing the core operation, the pivot takes place to rotate, and the sword that rolls over can rotate along with the pivot simultaneously, and the setting of gyro wheel can become to slide for rolling, avoids slider and shift fork to take place sliding friction, and the slider rotates comparatively smoothly.

6. Through gear engagement, when one of them core board that closes of can ensureing to overturn, another closes the core board and can overturn in step thereupon, and then ensures that two sets of book cores can synchronous operation realize closing the core.

7. When the gear driving mechanism works, the two core plates can be driven by the gear to synchronously overturn, and the degree of automation is higher.

Drawings

FIG. 1 is a top view of an offline assembling apparatus for a multi-coiled lithium battery according to an embodiment of the present invention;

FIGS. 2 and 3 are cross-sectional views A-A, B-B, respectively, of FIG. 1;

FIG. 4 is a top view of an offline assembling apparatus for a multi-coiled lithium battery according to a second embodiment of the present invention;

FIGS. 5 and 6 are cross-sectional views C-C, D-D, respectively, of FIG. 4;

FIG. 7 is a top view of an offline assembling apparatus for a multi-coiled lithium battery according to a third embodiment of the present invention;

FIGS. 8 and 9 are cross-sectional views E-E, F-F, respectively, of FIG. 7;

FIG. 10 is a top view of an offline assembling apparatus for a multi-coiled lithium battery according to a fourth embodiment of the present invention;

FIGS. 11 and 12 are sectional views G-G, H-H, respectively, of FIG. 10;

FIG. 13 is a top view of the core and cover plate of an embodiment of the present invention after attachment;

FIG. 14 is a front view of the core and cover plate of an embodiment of the present invention after attachment;

FIG. 15 is a schematic view of the core turning over in an embodiment of the invention;

FIG. 16 is a schematic view of the present invention after the core has been inverted;

wherein,

a bracket-1; mounting a stand column-11;

a cover plate support plate-2;

a core combining plate-3; a rotating shaft-31; a core placing groove-32; raised strips-311; gear-312;

folding knife-4; a slide block-41; a folding blade-42;

a shifting block-5; a shifting fork-51; a roller-52;

a shifting block driving mechanism-6; a telescoping mechanism-61; a connecting rod-62;

a gear driving mechanism-7;

a cover plate-8; a connecting sheet-81;

a roll core-9; and a tab-91.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, an off-line assembling device for a multi-core lithium battery comprises a support 1, a cover plate support plate 2, a core combining plate 3 and a folding knife 4.

In this embodiment, the main function of the bracket 1 is to provide mounting positions for other parts, the bracket 1 is not limited to a specific shape, as long as the parts can be mounted and matched as required, and corresponding functions are realized, and the bracket 1 is a rectangular plate in this embodiment.

For ease of description and understanding, the perspective of FIG. 1 is taken as the top view perspective, and the remaining orientations are referred to, it being understood that this orientation is set forth merely for convenience of description and understanding and is not to be construed as limiting the present invention.

As shown in fig. 1 and 3, a cover plate support plate 2 is horizontally arranged on the bracket 1; the cover plate supporting plate 2 is a rectangular plate, and the lower part of the cover plate supporting plate is supported by four upright posts.

As shown in fig. 1, two sides of the cover plate supporting plate 2 are respectively provided with a core combining plate 3, specifically, the core combining plates 3 are respectively located at the front side and the rear side of the cover plate supporting plate 2, the core combining plate 3 is of a rectangular plate-shaped structure, the core combining plate 3 is provided with a core placing groove 32, and the opening of the core placing groove 32 is upward and is communicated in the front-rear direction for placing the core 9.

As shown in fig. 1, a rotating shaft 31 is fixedly arranged on the core combining plate 3, the rotating shaft 31 is rotatably mounted on the support 1, the rotating shaft 31 is horizontally arranged, the rotating shafts 31 on two sides of the cover plate supporting plate 2 are parallel, and a core combining plate supporting column 33 is arranged below the core combining plate 3 for supporting the core combining plate 3 to ensure the horizontal state.

As shown in fig. 1, each core plate 3 is provided with two coaxial rotating shafts 31, the rotating shafts 31 are along the left and right direction, and the two rotating shafts 31 corresponding to each core plate 3 are respectively located at two sides of the core plate 3; specifically, the left side and the right side of the core combining plate 3 are respectively fixedly connected with the two rotating shafts 31 on the two sides thereof through a connecting plate.

As shown in fig. 1 and 2, four mounting columns 11 are arranged on the bracket 1, and the rotating shaft 31 is mounted on the corresponding mounting columns 11 through bearings.

As shown in fig. 1, a folding knife 4 is slidably mounted on the rotating shaft 31, the folding knife 4 can axially slide along the rotating shaft 31 to a position between the cover plate supporting plate 2 and the core combining plate 3, and the folding knife 4 can rotate along with the rotating shaft 31.

Specifically, as shown in fig. 1 and 3, a protruding strip 311 is disposed on the rotating shaft 31, the protruding strip 311 is parallel to the rotating shaft 31, a groove matched with the protruding strip 311 is disposed on the folding knife 4, and the folding knife 4 is slidably mounted on the rotating shaft 31 and the protruding strip 311.

As shown in fig. 1, the folding knife 4 includes a slider 41 slidably mounted on the rotating shaft 31, a folding blade 42 is disposed on the slider 41, and the folding blade 42 has a strip-shaped plate-like structure.

Referring to fig. 13 and 14, in practical application, a typical structure of the winding core and the cover plate is as follows: the apron 8 is located the centre, and the both sides of apron 8 respectively set up a set of book core 9, and every group includes two superimposed book cores 9 from top to bottom, and every group rolls up the inboard of core 9 and is provided with two utmost point ears 91, and utmost point ear 91 is connected with apron 8 through the connection piece 81 that corresponds respectively, combines fig. 13, 14, and connection piece 81 is bent by L shape sheet structure and is formed.

During initial state, the cover plate supporting plate 2 and the core plates 3 on both sides are in a horizontal state, the connected cover plate 8 is placed on the cover plate supporting plate 2 in the middle, the two groups of winding cores 9 are respectively placed on the corresponding core plates 3, after the corresponding positions are placed, the folding knife 4 is moved along the rotating shaft 31, the folding knife 4 is moved to the position between the cover plate supporting plate 2 and the core plates 3, and the folding knife 4 is positioned on the outer side of the corresponding connecting sheet 81. Preferably, the side surface of the folding blade 4 is parallel to the end surface of the winding core 9.

Further, the support 1 is provided with a long hole with a length direction along the front-rear direction, and further comprises two movable plates (not shown in the figure), the two movable plates are respectively mounted in the corresponding long holes in tandem through screws so as to realize front-rear position adjustment, the core plate supporting columns 33 and the mounting columns 11 corresponding to the core plates 3 on the front side and the rear side are respectively mounted on the corresponding movable plates, and the position adjustment between the core plates 3 and the cover plate supporting plates 2 can be realized through the position adjustment of the movable plates.

Example two:

the difference between this embodiment and the first embodiment is:

as shown in fig. 4, the device further comprises a shifting block 5 slidably mounted on the bracket 1, wherein the sliding direction of the shifting block 5 is parallel to the sliding direction of the sliding block 41; i.e. the sliding direction of the paddle 5 is in the left-right direction.

As shown in fig. 4, a shifting fork 51 with an opening facing the sliding block 41 is arranged on the shifting block 5, and the sliding block 41 is located in the opening of the shifting fork 51; and the support 1 is provided with a shifting block driving mechanism 6.

As shown in fig. 4 and 5, two shifting blocks 5 are provided, the two shifting blocks 5 are respectively located between the rotating shafts 31 at the same ends of the two core plates 3, specifically, two pairs of guide posts along the left-right direction are provided between the rotating shafts 31 at the front and rear sides, and the shifting blocks 5 are respectively slidably mounted on the corresponding guide posts.

As shown in fig. 4, two sides of the shifting block 5 are respectively provided with a shifting fork 51, and the sliding blocks 41 on two sides of the shifting block 5 are respectively positioned in the corresponding openings of the shifting forks 51; the shifting block driving mechanism 6 comprises a telescopic mechanism 61 with the telescopic direction perpendicular to the sliding direction of the shifting block 5, the movable end of the telescopic mechanism 61 is respectively connected with the two shifting blocks 5 through two connecting rods 62, namely, the two ends of each connecting rod 62 are respectively hinged on the movable end of the telescopic mechanism 61 and the shifting block 5, and the hinged shaft is arranged along the front-back direction. The telescopic mechanism 61 adopts a push rod motor or an air cylinder. The telescopic mechanism 61 is vertically disposed.

As shown in fig. 4 and 6, the fork 51 is provided with a pair of rollers 52, the rotation axis of the roller 52 is perpendicular to the sliding direction of the slider 41, the slider 41 is located between the two rollers 52 on the corresponding fork 51, the slider 41 is in a disk-shaped structure, the slider 41 is coaxial with the rotating shaft 31, and the axis of the roller 52 is parallel to the radial direction of the disk-shaped slider 41.

In practical application, when telescopic machanism 61 upwards stretches out, connecting rod 62 through both sides can promote shifting block 5 and remove, and shifting block 5 promotes folding knife 4 through gyro wheel 52 and removes, and all folding knives 4 are taken out to both sides, otherwise, when telescopic machanism 61 withdraws downwards, connecting rod 62 through both sides can promote shifting block 5 and remove, and shifting block 5 promotes folding knife 4 through gyro wheel 52 and removes, and all folding knives 4 insert to the centre, insert the back that targets in place, upset core board 3, and pivot 31 rotates, and pivot 31 then drives folding knife 4 through sand grip 311 and rotate together, and folding knife 4 can bend connection piece 81, and folding knife 4 can also hold corresponding book core 9 simultaneously, and simultaneously under gyro wheel 52's effect, folding knife 4 rotates comparatively smoothly.

Example three:

the difference between this embodiment and the second embodiment is:

as shown in fig. 7-9, the same gears 312 are disposed on the rotating shaft 31, and the corresponding gears 312 of the two core plates 3 are engaged with each other.

Example four:

the difference between this embodiment and the third embodiment is that:

as shown in fig. 10 to 12, the gear 312 is driven by a gear driving mechanism 7, specifically, the gear driving mechanism 7 includes a motor disposed on the bracket 1, and an output shaft of the motor is connected to the gear 312 through a coupler, or a driving gear is disposed on the output shaft of the motor and is engaged with one of the gears 312, so as to drive the core plate 3 to turn over.

The working principle is as follows:

in practical application, the offline assembly device for the multi-core lithium battery is mainly used for assembling a core and a cover plate, and as shown in fig. 13 and 14, a typical core and cover plate structure is as follows: the apron 8 is located the centre, and the both sides of apron 8 respectively set up a set of book core 9, and every group includes two superimposed book cores 9 from top to bottom, and every group rolls up the inboard of core 9 and is provided with two utmost point ears 91, and utmost point ear 91 is connected with apron 8 through the connection piece 81 that corresponds respectively. In the initial state, the cover plate support plate 2 and the core plates 3 on both sides are in the horizontal state, the connected cover plate 8 is placed on the cover plate support plate 2 in the middle, the two groups of winding cores 9 are respectively placed on the corresponding core plates 3, after the corresponding positions are placed, the folding knife 4 is moved along the rotating shaft 31 and is moved to the position between the cover plate support plate 2 and the core plates 3, the folding knife 4 is positioned at the outer side of the corresponding connecting piece 81, after the corresponding positions are moved in place, the two core plates 3 are pulled to rotate the core plates 3 around the corresponding rotating shaft 31, at the moment, the folding knife 4 rotates along with the rotating shaft 31, the connecting piece 81 can be shifted to bend when the folding knife 4 rotates, namely, the core plates 3 are in the state shown in fig. 15, after being turned over for 90 degrees, the vertical state, at the moment, the two groups of winding cores 9 are turned over and assembled, namely, the state shown in fig. 16, then the folding knife 4 is withdrawn and reset, and the two core plates 3 are reset, when the multi-roll-core lithium battery offline assembly device is used for assembling batteries, the operation is convenient, and the multi-roll-core lithium battery offline assembly device has the advantages of simple structure, high precision, low cost, convenience in use and the like.

The raised strips 311 can limit circumferential rotation of the folding knives 4, so that circumferential rotation of the folding knives 4 is avoided while the folding knives 4 axially slide on the rotating shaft 31, and the connecting sheet 81 can be bent while the folding knives 4 move, so that core closing operation is realized.

The shifting block driving mechanism 6 can drive the shifting block 5 to slide, and then drives the shifting block 5 to stir the sliding block 41 to move, so that the folding knife 4 is inserted and reset.

When the movable end of the telescopic mechanism 61 acts, the connecting rod 62 can drive the shifting block 5 to reciprocate at the same time, so that the folding knife 4 is driven to move, the automation degree is high, and the operation is convenient and reliable.

When closing the core operation, pivot 31 takes place to rotate, and folding knife 4 can rotate along with pivot 31 simultaneously, and the setting of gyro wheel 52 can become to slide for rolling, avoids slider 41 and shift fork 51 to take place sliding friction, and slider 41 rotates comparatively smoothly.

Through gear engagement, when one of them core board 3 that closes of can guaranteeing to overturn, another core board 3 that closes can overturn in step thereupon, and then ensures that two sets of book cores 9 can synchronous operation realize closing the core.

When the gear driving mechanism 7 works, the two core plates 3 can be driven to synchronously turn over through the gear 312, and the degree of automation is high.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a many rolls up core lithium cell off-line assembly quality which characterized in that: comprises a bracket (1), wherein a cover plate supporting plate (2) is horizontally arranged on the bracket (1);

two sides of the cover plate supporting plate (2) are respectively provided with a core combining plate (3), a rotating shaft (31) is fixedly arranged on the core combining plate (3), the rotating shaft (31) is rotatably arranged on the bracket (1), the rotating shaft (31) is horizontally arranged, and the rotating shafts (31) on the two sides of the cover plate supporting plate (2) are parallel;

sliding mounting has folding knife (4) on pivot (31), and folding knife (4) can be followed pivot (31) axial slip to apron backup pad (2) and close the position between core plate (3), and folding knife (4) can rotate along with pivot (31).

2. The off-line assembling device for the multi-roll lithium battery as claimed in claim 1, wherein: and a winding core placing groove (32) is arranged on the core combining plate (3).

3. The off-line assembling device for the multi-roll lithium battery as claimed in claim 1, wherein: be provided with sand grip (311) on pivot (31), sand grip (311) are on a parallel with pivot (31), be provided with on folding knife (4) with sand grip (311) complex recess, folding knife (4) slidable mounting is on pivot (31) and sand grip (311).

4. The off-line assembling device for the multi-roll lithium battery as claimed in claim 1, wherein: the folding knife (4) comprises a sliding block (41) which is slidably mounted on the rotating shaft (31), a folding blade (42) is arranged on the sliding block (41), and the folding blade (42) is of a long strip-shaped plate-shaped structure.

5. The off-line assembling device for the multi-roll lithium battery as claimed in claim 4, wherein: the sliding device also comprises a shifting block (5) which is arranged on the bracket (1) in a sliding manner, and the sliding direction of the shifting block (5) is parallel to the sliding direction of the sliding block (41);

a shifting fork (51) with an opening facing the sliding block (41) is arranged on the shifting block (5), and the sliding block (41) is positioned in the opening of the shifting fork (51);

the support (1) is provided with a shifting block driving mechanism (6).

6. The off-line assembling device for the multi-roll lithium battery as claimed in claim 5, wherein: each core combining plate (3) is provided with two coaxial rotating shafts (31), and the two rotating shafts (31) corresponding to each core combining plate (3) are respectively positioned at two sides of the core combining plate (3);

the two shifting blocks (5) are arranged, the two shifting blocks (5) are respectively positioned between the rotating shafts (31) at the same ends of the two core plates (3), two shifting forks (51) are respectively arranged on two sides of each shifting block (5), and the sliding blocks (41) on two sides of each shifting block (5) are respectively positioned in the openings of the corresponding shifting forks (51);

the shifting block driving mechanism (6) comprises a telescopic mechanism (61) with the telescopic direction perpendicular to the sliding direction of the shifting block (5), and the movable end of the telescopic mechanism (61) is connected with the two shifting blocks (5) through two connecting rods (62) respectively.

7. The off-line assembling device for the multi-roll lithium battery as claimed in claim 6, wherein: the telescopic mechanism (61) adopts a push rod motor or an air cylinder.

8. The off-line assembling device for the multi-roll lithium battery as claimed in claim 5, wherein: the shifting fork (51) is provided with a pair of rollers (52), the rotating axis of each roller (52) is perpendicular to the sliding direction of the corresponding sliding block (41), and the sliding block (41) is located between the two rollers (52) on the corresponding shifting fork (51).

9. The off-line assembling device for the multi-roll lithium battery as claimed in claim 1, wherein: the same gears (312) are arranged on the rotating shaft (31), and the gears (312) corresponding to the two core plates (3) are meshed with each other.

10. The off-line assembling apparatus for multi-roll lithium battery as claimed in claim 9, wherein: the gear (312) is driven by a gear driving mechanism (7).