CN115043194A

CN115043194A - A screening plant for installation of lithium cell group

Info

Publication number: CN115043194A
Application number: CN202210984448.6A
Authority: CN
Inventors: 李洪辉; 许友林; 甘晓尚
Original assignee: Xuzhou Yimao Electronic Technology Co ltd
Current assignee: Xuzhou Yimao Electronic Technology Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2022-09-13

Abstract

The invention discloses a screening device for lithium battery pack installation, which comprises a clamping plate body, a plurality of lithium batteries to be arranged and arranged below the clamping plate body, and a plurality of fixed disks fixed at the bottom of the clamping plate body in an array mode, wherein jacks corresponding to the fixed disks are formed in the clamping plate body, an electric driver is arranged in each fixed disk, a pressing pipe is fixed at the output end of each electric driver, and a lifting disk used for extruding the end face of each lithium battery is arranged at one end, facing the lithium batteries, of each pressing pipe. According to the invention, when the positive electrode end of the lithium battery faces upwards, the clamping point switching mechanism rolls on the surface of the lithium battery, the position of the clamping point is changed at the moment, namely the clamping point moves downwards, and the clamping is unstable at the moment, so that the lithium battery with the upward positive electrode end turns over for 180 degrees due to unstable gravity, namely the positive electrode end of the lithium battery faces downwards, and further the consistent orientation of all the lithium batteries can be realized.

Description

A screening plant for installation of lithium cell group

Technical Field

The invention relates to the technical field of battery pack installation, in particular to a screening device for lithium battery pack installation.

Background

Currently, during the installation of a lithium battery pack, a plurality of single-group lithium batteries are assembled to a fixed mold to form a series-connected lithium battery pack. Wherein the lithium cell group in fixed mould can meet the condition that two adjacent lithium cell positive negative pole tip syntropys were arranged at the in-process of establishing ties, and this condition can lead to unable normal series connection, use lithium cell group. The installation among the prior art generally adopts two erectors, one is used for installing positive terminal lithium cell group up, and another is used for installing negative pole terminal lithium cell group up, and this kind of mounting method all needs to arrange the orientation position that the lithium cell corresponds well in earlier stage usually, then is convenient for the later stage to get and take the installation, but this kind of mode often needs a large amount of preparation in earlier stage, still need to use multiple apparatus and equipment simultaneously, often can cause the problem that the installation effectiveness reduces.

To this end, we have designed a screening device for lithium battery pack installation.

Disclosure of Invention

The invention aims to solve the problems that the end parts of the positive and negative electrodes of two adjacent lithium batteries cannot be normally connected in series and the lithium battery pack cannot be used due to the same-direction arrangement, and provides a screening device for mounting the lithium battery pack.

In order to achieve the purpose, the invention adopts the following technical scheme:

a screening device for lithium battery pack installation comprises a clamping plate body, a plurality of lithium batteries to be arranged and arranged below the clamping plate body, and a plurality of fixed disks fixed at the bottom of the clamping plate body in an array manner, wherein the clamping plate body is provided with an extending hole corresponding to the position of the fixed disks, an electric impeller is arranged in the fixed disks, the output end of the electric impeller is fixedly provided with a pressing pipe, one end of the pressing pipe, facing the lithium batteries, is provided with a lifting disk for extruding the end face of the lithium batteries, two ends of each lithium battery are respectively provided with a fixed plate for clamping and reversing and a clamping point switching mechanism, an induction trigger mechanism for pushing the clamping point switching mechanism to change positions is arranged in each lifting disk, the fixed plates are fixed with the fixed disks, the clamping point switching mechanism is connected with the fixed disks through the pushing switching mechanism, the pushing mechanism comprises a first fixed pipe and a telescopic rod which slides up and down in the first fixed pipe, the telescopic link passes through square inserted bar and links to each other with centre gripping point switching mechanism, first fixed pipe lateral wall is equipped with the fixed pipe of second, and the fixed intraductal drive mechanism that is equipped with of second, be equipped with extrusion point switching mechanism in the fixed plate.

Preferably, the pinch point switching mechanism includes the V-arrangement pole to and set up arc board and the bump board at V-arrangement pole both ends and interconnect, the V-arrangement pole passes through the pillow block and links to each other with square inserted bar tip rotation, and the pillow block links to each other through the clockwork spring that resets with the V-arrangement pole, the arc board is equipped with the arc rubber piece towards lithium cell one end, be equipped with a bump on the bump board.

Preferably, the induction trigger mechanism comprises a telescopic pipe coaxially fixed on the lifting disc, a circular block sliding in the telescopic pipe and an oil guide pipe fixed in the pressing pipe, the pressing pipe is communicated with the telescopic pipe, the circular block slides in the telescopic pipe in a telescopic manner through a return spring, hydraulic oil is filled between the oil guide pipe and the circular block, and the oil guide pipe is connected with the transmission mechanism through a hose.

Preferably, the pushing and switching mechanism further comprises a first rack which stretches and slides up and down in the first fixed pipe, and a meshing gear which is meshed with the first rack for transmission, and the first rack is fixedly connected with the top of the telescopic rod.

Preferably, drive mechanism includes at the fixed intraductal gliding second rack of second, fix the solid fixed ring at the fixed intraductal wall of second to and at the fixed intraductal gliding piston of second, the piston links to each other with the second rack through the connecting rod that runs through solid fixed ring, the second rack runs through first fixed pipe through the jack, the hose is through fixing connecting pipe and the fixed intraductal intercommunication of second on the fixed pipe of second, all pack in the fixed intraductal and hose on piston right side has hydraulic oil.

Preferably, the square inserted bar slides left and right at the telescopic link through a square hole formed in the telescopic link, one end, far away from the clamping point switching mechanism, of the square inserted bar is fixed with a magnet, and the square inserted bars located on two sides of the telescopic link are respectively sleeved with a first electromagnetic generator used for generating the magnetic poles same as the magnetic poles of the magnet and a buffer spring used for pushing the clamping point switching mechanism.

Preferably, when the reset spring is not acted by external force, the arc plate and the square inserted bar are perpendicular to each other.

Preferably, extrusion point switching mechanism is including seting up the rectangle slide bar in inner chamber, the vertical setting in the fixed plate, gliding iron slider about on the rectangle slide bar to and at the flexible pivoted first suppression piece of fixed plate lateral wall and second suppression piece, first suppression piece and second suppression piece are all through flexible the rotation of dwang on the fixed plate, the dwang is equipped with the ejector pad towards rectangle slide bar one side, be equipped with two spacing rings on the rectangle slide bar, and the iron slider is located between two spacing rings, rectangle slide bar both ends are equipped with second electromagnetic generator and third electromagnetic generator respectively, the fixed plate is equipped with the second extrusion touch panel that is used for starting second electromagnetic generator and the first extrusion touch panel that is used for starting third electromagnetic generator towards the upper and lower both ends on one side of the lithium cell respectively.

The invention has the beneficial effects that:

1. when the positive electrode end of the lithium battery faces upwards, the clamping point switching mechanism rolls on the surface of the lithium battery, the position of the clamping point is changed, namely the clamping point moves downwards, and clamping is unstable at the moment, so that the lithium battery with the upward positive electrode end turns over for 180 degrees due to unstable gravity, namely the positive electrode end of the lithium battery faces downwards, and further the consistent orientation of all the lithium batteries can be realized.

2. When the lithium battery is clamped again after the orientation of the lithium battery is corrected, the first rack penetrates through the fixed disc and extends into the jack on the clamping plate body, so that the jack in the lithium battery to be turned can be inserted by the insertion rod according to different selections, the first rack at the corresponding position is lowered, the purpose of turning the lithium battery in the steps can be achieved, and the selection of the lithium battery sequencing can be further achieved.

Drawings

Fig. 1 is a schematic structural diagram of a screening device for lithium battery pack installation according to the present invention;

FIG. 2 is a schematic structural diagram of a clamping mechanism at two ends of a lithium battery in the screening device for mounting the lithium battery pack, according to the present invention;

FIG. 3 is a schematic diagram illustrating an internal structure of a first fixing tube in a screening device for lithium battery pack installation according to the present invention;

FIG. 4 is a schematic view of an upper portion of a first stationary tube of a screening apparatus for lithium battery pack installation according to the present invention;

FIG. 5 is a partial view of the lower portion of a first stationary tube of a screening apparatus for lithium battery pack installation according to the present invention;

FIG. 6 is a schematic structural diagram of a lifting disc in the screening device for lithium battery pack installation according to the present invention;

FIG. 7 is a schematic diagram illustrating an internal structure of a second fixing tube of a screening device for lithium battery pack installation according to the present invention;

fig. 8 is a schematic diagram of the internal structure of a fixing plate in a screening device for lithium battery pack installation according to the present invention.

In the figure: 1. a clamping plate body; 2. a lithium battery; 3. an access hole; 4. fixing the disc; 5. a first stationary tube; 6. a telescopic rod; 7. a fixing plate; 8. a lifting plate; 9. a second stationary tube; 10. a first rack; 11. a second rack; 12. a meshing gear; 13. a jack; 14. an arc plate; 15. a bump plate; 16. a V-shaped rod; 17. a pillow block; 18. a square inserted link; 19. a buffer spring; 20. a first electromagnetic generator; 21. a magnet; 22. a circular block; 23. a return spring; 24. a telescopic pipe; 25. an oil guide pipe; 26. pressing a pipe; 27. a hose; 28. a connecting pipe; 29. a fixing ring; 30. a piston; 31. a connecting rod; 32. a first pressing block; 33. rotating the rod; 34. a push block; 35. a second pressing block; 36. an iron slider; 37. a limiting ring; 38. a first press touch plate; 39. a second press pad; 40. a second electromagnetic generator; 41. a third electromagnetic generator; 42. a rectangular slide bar.

Detailed Description

Referring to fig. 1-8, a screening plant for installation of lithium cell group, includes grip block body 1, sets up a plurality of lithium cell 2 of treating the arrangement in grip block body 1 below to and a plurality of array fix the fixed disk 4 in grip block body 1 bottom, set up on grip block body 1 with the hole 3 that stretches into that the 4 positions of fixed disk correspond, wherein treat lithium cell 2 of arrangement and be disordered towards the position, need subsequent processing arrangement.

Be equipped with electronic impeller in the fixed disk 4, electronic impeller's output is fixed with presses down pipe 26, presses down pipe 26 and is equipped with the lifting disk 8 that is used for extrudeing lithium cell 2 terminal surface towards lithium cell 2 one end, can let to press down pipe 26 and take the lifting disk 8 of below to descend and touch the terminal surface of below lithium cell 2 through opening electronic impeller like this, then according to the shape of lithium cell 2 terminal surface through lifting disk 8 feedback to first fixed pipe 5 in, and accomplish further feedback and adjust.

The two ends of the lithium battery 2 are respectively provided with a fixing plate 7 and a clamping point switching mechanism for clamping and reversing, so that the lithium battery 2 can be squeezed into a position between the fixing plate 7 and the clamping point switching mechanism when the clamping plate body 1 descends, and the lithium battery 2 in the middle position can be clamped.

Referring to fig. 5, the pinch point switching mechanism includes V-shaped rod 16, and arc board 14 and bump board 15 that set up at V-shaped rod 16 both ends and interconnect, V-shaped rod 16 rotates with square inserted bar 18 tip through pillow block 17 and links to each other, and pillow block 17 links to each other through the clockwork spring that resets with V-shaped rod 16, arc board 14 is equipped with the arc rubber piece towards 2 one end of lithium cell, it can guarantee to laminate mutually with 2 surfaces of lithium cell arc board 14 to set up like this, the dropping of lithium cell 2 has been avoided, be equipped with a bump on bump board 15 simultaneously, can guarantee like this when the arc board 14 on lithium cell 2 switches into bump board 15, because 2 both ends of lithium cell all become the unstable state, both ends become the point support promptly, thereby lead to lithium cell 2 to take place to deflect. Meanwhile, when the reset spring is not acted by external force, the arc plate 14 and the square insertion rod 18 are perpendicular to each other, so that the initial state can be guaranteed, under the action of the arc plate 14 and the fixing plate 7, one side of the lithium battery 2 is clamped by a face, and the other side of the lithium battery is clamped by a point, and the stable effect can be achieved.

The square insertion rod 18 slides left and right on the telescopic rod 6 through a square hole formed in the telescopic rod 6, a magnet 21 is fixed at one end, away from the clamping point switching mechanism, of the square insertion rod 18, a first electromagnetic generator 20 used for generating a magnetic pole the same as that of the magnet 21 and a buffer spring 19 used for pushing the clamping point switching mechanism are respectively sleeved on the square insertion rods 18 located on two sides of the telescopic rod 6, wherein it needs to be explained that the first electromagnetic generator 20 is arranged to generate a magnetic pole the same as that of the magnet 21, the square insertion rod 18 can be away from the lithium battery 2 due to the arrangement, the effect of loosening the lithium battery 2 is achieved, when the first electromagnetic generator 20 is closed, the square insertion rod 18 at the moment can be reset under the effect of the buffer spring 19, and the effect of resetting the lithium battery 2 between the clamping point switching mechanism and the fixing plate 7 is achieved.

An induction trigger mechanism for pushing the clamping point switching mechanism to change positions is arranged in the lifting disc 8, and as shown in fig. 6, the induction trigger mechanism comprises an extension tube 24 coaxially fixed on the lifting disc 8, a circular block 22 sliding in the extension tube 24, and an oil conduit 25 fixed in the pressing tube 26, the pressing tube 26 is communicated with the telescopic tube 24, the circular block 22 slides in the telescopic tube 24 in a telescopic manner through a return spring 23, hydraulic oil is filled between the oil conduit 25 and the circular block 22, the oil conduit 25 is connected with a transmission mechanism through a hose 27, it should be noted that the circular block 22 can effectively identify the shape of the end surface of the lithium battery 2 pressed by the lifting disc 8, when the positive end is pressed, the end surface is uneven, so that the positive end presses against the circular block 22, lifting it, and causing the internal hydraulic oil to flow, so that hydraulic oil will flow into the second stationary pipe 9 and open the drive transmission for movement.

Fixed plate 7 is fixed with fixed disk 4, pinch point switching mechanism links to each other with fixed disk 4 through promoting switching mechanism, promote switching mechanism including first fixed pipe 5 and gliding telescopic link 6 from top to bottom in first fixed pipe 5, telescopic link 6 links to each other with pinch point switching mechanism through square inserted bar 18, promote switching mechanism still includes telescopic gliding first rack 10 from top to bottom in first fixed pipe 5, and mesh gear 12 with first rack 10 meshing transmission, first rack 10 and 6 top fixed connection of telescopic link, the lift of first rack 10 just can drive telescopic link 6 of below together go up and down, can make pinch point switching mechanism roll on lithium cell 2 surface, and then can switch into bump board 15 with the arc board 14 on lithium cell 2 surface originally.

The side wall of the first fixed pipe 5 is provided with a second fixed pipe 9, a transmission mechanism is arranged in the second fixed pipe 9, the transmission mechanism comprises a second rack 11 sliding in the second fixed pipe 9, a fixed ring 29 fixed on the inner wall of the second fixed pipe 9, and a piston 30 sliding in the second fixed pipe 9, the piston 30 is connected with the second rack 11 through a connecting rod 31 penetrating through the fixed ring 29, the second rack 11 is connected and penetrates through the first fixed pipe 5 through a jack 13, a hose 27 is communicated with the second fixed pipe 9 through a connecting pipe 28 fixed on the second fixed pipe 9, the second fixed pipe 9 and the hose 27 on the right side of the piston 30 are both filled with hydraulic oil, wherein due to the lifting of the circular block 22, the hydraulic oil can enter the second fixed pipe 9 and can push the piston 30 to drive the second rack 11 to move together, the moving second rack 11 drives the first rack 10 meshed with the meshed gear 12 to move together through the meshed gear 12, in this way, the first rack 10 can be lowered, and the pinch point switching mechanism can roll on the surface of the lithium battery 2.

It should be noted that, when the positive terminal of the lithium battery 2 is upward, the pinch point switching mechanism will roll on the surface of the lithium battery 2, and the pinch point position will change, that is, the clamping point moves downwards, and the clamping is unstable at this time, which causes the lithium battery 2 with the upward positive electrode end to turn 180 degrees due to unstable gravity, namely, the positive electrode terminal of the lithium battery 2 faces downwards at this time, so that the orientations of all the lithium batteries 2 are consistent, then the lithium battery 2 with the changed orientation is placed back into the original battery jar, the first electromagnetic generator 20 is started to prevent the lithium battery 2 from being clamped, the lithium battery 2 with the changed orientation is temporarily placed, then the battery jar is turned over to lead the positive pole end of the lithium battery 2 to face upwards again, the first electromagnetic generator 20 is closed after the height of the lithium battery 2 is adjusted to the same position, under the action of the reset spring, the arc plate 14 is reset, and the lithium battery 2 can be stably clamped again.

A squeezing point switching mechanism is arranged in the fixed plate 7, as shown in fig. 8, the squeezing point switching mechanism comprises an inner cavity arranged in the fixed plate 7, a rectangular sliding rod 42 vertically arranged in the inner cavity, an iron sliding block 36 sliding up and down on the rectangular sliding rod 42, and a first pressing block 32 and a second pressing block 35 rotating telescopically on the side wall of the fixed plate 7, the first pressing block 32 and the second pressing block 35 both rotate telescopically on the fixed plate 7 through a rotating rod 33, a push block 34 is arranged on one side of the rotating rod 33 facing the rectangular sliding rod 42, two limit rings 37 are arranged on the rectangular sliding rod 42, the iron sliding block 36 is positioned between the two limit rings 37, a second electromagnetic generator 40 and a third electromagnetic generator 41 are respectively arranged at two ends of the rectangular sliding rod 42, a second squeezing touch plate 39 for starting the second electromagnetic generator 40 and a first squeezing touch plate 38 for starting the third electromagnetic generator 41 are respectively arranged at the upper and lower ends of one side of the fixed plate 7 facing the lithium battery 2, when the pinch point switching mechanism is arranged to rotate, the lithium battery 2 is pushed to deflect temporarily due to unbalanced stress, wherein the second pressing contact plate 39 for starting the second electromagnetic generator 40 and the first pressing contact plate 38 for starting the third electromagnetic generator 41 are both in the prior art, when the first pressing contact plate 38 and the second pressing contact plate 39 are pressed, the internal circuit is communicated to generate current on the third electromagnetic generator 41 and the second electromagnetic generator 40, and then a magnetic field is generated to play a role of adsorbing the iron sliding block 36, so that the iron sliding block 36 slides on the rectangular sliding rod 42, the lithium battery 2 can extrude the first pressing contact plate 38 in the deflection process, at the moment, the third electromagnetic generator 41 can generate current, and the generated magnetic field can attract the iron sliding block 36 to move towards the second pressing block 35, so that the rotating rod can push the iron sliding block 33 and the pushing block 34, the first pressing block 32 is retracted into the fixing plate 7, and the second pressing block 35 is pushed out, so that the original position of the clamping point of the lithium battery 2 can be changed, and finally the lithium battery 2 can be turned over.

It should be noted that, when the lithium battery 2 is clamped again after being corrected, because the first rack 10 runs through the fixed disk 4 and stretches into the hole 3 on the clamping plate body 1, the hole 3 that stretches into in the lithium battery 2 position that will overturn according to the selection difference can be inserted into the inserted bar, and the first rack 10 that lets the corresponding position descends, and then can realize the upset effect of lithium battery 2 in the above-mentioned step, and then can realize the selection of lithium battery 2 sequencing.

The working principle of the invention is as follows: firstly, lithium batteries 2 which are disordered are clamped between a fixing plate 7 and a clamping point switching mechanism, then a lifting disc 8 is descended, the lifting disc 8 is enabled to sense the position of the end face of the corresponding lithium battery 2, further, all the positive terminals of all the lithium batteries 2 are downward, then the lithium batteries 2 with changed directions are placed back into the original battery jar, a first electromagnetic generator 20 is started to enable the lithium batteries 2 not to be subjected to clamping force, the lithium batteries 2 with changed directions are placed temporarily, then the battery jar is overturned, the positive terminals of the lithium batteries 2 are upward again, the first electromagnetic generator 20 is closed after the heights of the lithium batteries 2 are adjusted to the same position, under the action of a reset spring, an arc plate 14 is reset, the lithium batteries 2 can be clamped stably again, finally, the inserting rods 3 are inserted according to own selection, the first racks 10 at the corresponding positions are descended, and the overturning effect of the lithium batteries 2 in the steps can be realized, and then the selection of the order of the lithium batteries 2 can be realized.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A screening device for lithium battery pack installation comprises a clamping plate body (1), a plurality of lithium batteries (2) to be arranged below the clamping plate body (1) and a plurality of fixed disks (4) fixed to the bottom of the clamping plate body (1) in an array manner, wherein an extending hole (3) corresponding to the position of each fixed disk (4) is formed in each clamping plate body (1), an electric pusher is arranged in each fixed disk (4), and is characterized in that a pressing pipe (26) is fixed at the output end of the electric pusher, a lifting disk (8) used for extruding the end face of each lithium battery (2) is arranged at one end, facing the lithium batteries (2), of each pressing pipe (26), a fixing plate (7) used for clamping and reversing and a clamping point switching mechanism are arranged at two ends of each lithium battery (2), and an induction trigger mechanism used for pushing the clamping point switching mechanism to switch is arranged in each lifting disk (8), fixed plate (7) are fixed with fixed disk (4), the pinch point switching mechanism links to each other with fixed disk (4) through promoting switching mechanism, promote switching mechanism including first fixed pipe (5) and gliding telescopic link (6) from top to bottom in first fixed pipe (5), telescopic link (6) link to each other with the pinch point switching mechanism through square inserted bar (18), first fixed pipe (5) lateral wall is equipped with the fixed pipe of second (9), and is equipped with drive mechanism in the fixed pipe of second (9), be equipped with extrusion point switching mechanism in fixed plate (7).

2. The screening device for the lithium battery pack installation according to claim 1, wherein the clamping point switching mechanism comprises a V-shaped rod (16), an arc plate (14) and a convex point plate (15), the arc plate and the convex point plate are arranged at two ends of the V-shaped rod (16) and are connected with each other, the V-shaped rod (16) is rotatably connected with the end part of a square insertion rod (18) through a boss (17), the boss (17) is connected with the V-shaped rod (16) through a reset spring, an arc rubber block is arranged at one end, facing the lithium battery (2), of the arc plate (14), and a convex point is arranged on the convex point plate (15).

3. The screening device for the lithium battery pack installation according to claim 1, wherein the induction trigger mechanism comprises a telescopic pipe (24) coaxially fixed on the lifting disc (8), a circular block (22) sliding in the telescopic pipe (24), and an oil guide pipe (25) fixed in a pressing pipe (26), the pressing pipe (26) is communicated with the telescopic pipe (24), the circular block (22) slides in the telescopic pipe (24) in a telescopic way through a return spring (23), hydraulic oil is filled between the oil guide pipe (25) and the circular block (22), and the oil guide pipe (25) is connected with a transmission mechanism through a hose (27).

4. The screening device for lithium battery pack installation according to claim 1, wherein the pushing and switching mechanism further comprises a first rack (10) which slides up and down telescopically in the first fixed pipe (5), and an engaging gear (12) which is in meshing transmission with the first rack (10), and the first rack (10) is fixedly connected with the top of the telescopic rod (6).

5. A screening device for lithium battery pack installation according to claim 3, wherein the transmission mechanism comprises a second rack (11) sliding in the second fixed tube (9), a fixed ring (29) fixed on the inner wall of the second fixed tube (9), and a piston (30) sliding in the second fixed tube (9), the piston (30) is connected with the second rack (11) through a connecting rod (31) penetrating through the fixed ring (29), the second rack (11) penetrates through the first fixed tube (5) through a jack (13), the hose (27) is communicated with the second fixed tube (9) through a connecting pipe (28) fixed on the second fixed tube (9), and hydraulic oil is filled in the second fixed tube (9) on the right side of the piston (30) and the hose (27).

6. The screening device for the lithium battery pack installation according to claim 1, wherein the square insertion rod (18) slides left and right on the telescopic rod (6) through a square hole formed in the telescopic rod (6), a magnet (21) is fixed at one end of the square insertion rod (18) far away from the clamping point switching mechanism, and the square insertion rod (18) positioned at two sides of the telescopic rod (6) is respectively sleeved with a first electromagnetic generator (20) for generating the same magnetic pole as the magnet (21) and a buffer spring (19) for pushing the clamping point switching mechanism.

7. A screening device for lithium battery pack installation according to claim 2, wherein the arc plate (14) and the square insertion rod (18) are arranged perpendicular to each other when the reset spring is not acted by external force.

8. The screening device for the lithium battery pack installation according to claim 1, wherein the extrusion point switching mechanism comprises an inner cavity arranged in the fixed plate (7), a rectangular sliding rod (42) vertically arranged in the inner cavity, an iron sliding block (36) vertically sliding on the rectangular sliding rod (42), and a first pressing block (32) and a second pressing block (35) telescopically rotating on the side wall of the fixed plate (7), the first pressing block (32) and the second pressing block (35) both telescopically rotate on the fixed plate (7) through a rotating rod (33), the rotating rod (33) is provided with a pushing block (34) towards one side of the rectangular sliding rod (42), the rectangular sliding rod (42) is provided with two limiting rings (37), the iron sliding block (36) is positioned between the two limiting rings (37), the two ends of the rectangular sliding rod (42) are respectively provided with a second electromagnetic generator (40) and a third electromagnetic generator (41), and the upper end and the lower end of one side, facing the lithium battery (2), of the fixing plate (7) are respectively provided with a second extrusion contact plate (39) for starting a second electromagnetic generator (40) and a first extrusion contact plate (38) for starting a third electromagnetic generator (41).