Multi-layer pressing structure

Abstract

The utility model belongs to the field of battery manufacturing equipment, and particularly relates to a multi-layer pressing structure which comprises a fixed large plate, an upper fixed plate, a multi-layer follow-up pressing plate structure arranged between the upper fixed plate and the fixed large plate, and a power unit for providing power for the multi-layer follow-up pressing plate structure, the multi-layer follow-up pressing plate structure comprises a push plate, multi-layer follow-up pressing plates, supporting optical shafts connecting the push plate with the follow-up pressing plates and connecting the push plate with the follow-up pressing plates and connecting the follow-up pressing plates, and cross connecting rod structures achieving linkage between the push plate and the follow-up pressing plates and connecting the push plate with the follow-up pressing plates. The multi-layer pressing mechanism is high in universality and good in compatibility, and can be compatible with hot pressing of a pole group and short circuit detection restraint and helium return restraint of a battery cell through model changing. The laminated plate structures are connected through the crossed connecting rod structure, pressing force is transmitted, and any part does not need to be disassembled, assembled and replaced when a product is remodeled. The structure is simple, manufacturing cost is low, and application is wide.

Description

Technical Field

[0001] The utility model belongs to the field of battery manufacturing equipment, and in particular relates to a multi-layer pressing structure. Background Art

[0002] The compression structure is widely used in the production process of lithium batteries. In the pole group hot pressing equipment in the assembly process, it is usually necessary to hot press the pole group so that the pole group can be formed to a fixed thickness and shape size to facilitate the subsequent assembly process. In the short-circuit test station of the primary injection equipment in the injection process and the helium return station of the secondary injection, it is usually necessary to compress and constrain the battery cell, and then perform a short-circuit test or return helium to the battery cell. In order to improve equipment efficiency, a multi-layer compression structure is usually used to compress the pole group or battery cell.

[0003] The existing multi-layer pressing structure usually adopts a pull rod and a spring structure to connect the follower layer plate structures, or adopts a cylinder to connect the follower layer plate structures.

[0004] When the pull rod and spring structure are used to connect the follower plate structures, the spacing between the follower plate structures cannot be equidistant and synchronously increased or decreased; in addition, limit blocks need to be installed between the follower plate structures to transmit the clamping force. When the product is changed, the thickness of the pole group and the battery cell changes, and the limit blocks need to be replaced synchronously, which is inconvenient and costly.

[0005] When using a cylinder to connect the follower layer plate structures, due to the limited height of the pole group or battery cell, the cylinder is usually installed on the outside of the clamping structure, the structure is complex, the equipment manufacturing cost is high, and it is also necessary to use a limit block to transmit the clamping force, the changeover is more complicated and the changeover cost is higher. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects in the prior art and provide a multi-layer compression structure.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A multi-layer clamping structure includes a lower fixed plate, an upper fixed plate, a multi-layer follower pressure plate structure arranged between the upper fixed plate and the lower fixed plate, and a power unit that provides power for the multi-layer follower pressure plate structure; the multi-layer follower pressure plate structure includes a push plate, a multi-layer follower pressure plate, a supporting optical axis connecting the push plate and the follower pressure plate and between the follower pressure plates, and a cross-link structure that realizes the linkage between the push plate and the follower pressure plate and between the follower pressure plates.

[0009] The cross-link structure comprises two groups, which are respectively arranged on the left and right sides of the multi-layer follower pressure plate structure.

[0010] The cross-link structure includes short link units arranged at the head and tail and a plurality of long link units arranged in the middle;

[0011] The long connecting rod unit is composed of two long connecting rods connected crosswise; a pin bolt mounting hole is arranged in the middle of the long connecting rod, and connecting rod pin mounting holes are arranged at both ends; the pin bolt mounting hole in the middle connects the two crossed long connecting rods through the pin bolt; the connecting rod pin mounting holes at both ends crosswise connect the long connecting rods of the adjacent long connecting rod units;

[0012] The pin bolt connected to the long connecting rod is connected to the follower pressure plate;

[0013] The short connecting rod unit is composed of two short connecting rods connected crosswise: one end of the short connecting rod is provided with a connecting rod pin mounting hole, and the other end is provided with a pin shaft bolt mounting hole; the connecting rod pin mounting hole connects the short connecting rod and the adjacent long connecting rod through a connecting rod pin, and the pin shaft bolt mounting hole is provided with a pin shaft bolt to connect the cross short connecting rods;

[0014] The pin bolts arranged in the top short connecting rod unit and the bottom short connecting rod unit are connected to the push plate and the lower fixing plate respectively.

[0015] The connecting rod pin mounting hole and the pin shaft bolt mounting hole are independently provided with roller bearings; and washers are provided in the pin shaft bolt mounting holes.

[0016] The power unit includes a motor, a reducer connected to the motor, and a screw lifting structure connected to the reducer; the screw lifting mechanism includes a bearing seat arranged on the upper fixed plate, a deep groove ball bearing arranged in the bearing seat, a screw nut arranged in the deep groove ball bearing, a ball screw arranged in the screw nut and connected to the screw nut, an expansion type synchronous wheel arranged outside the screw nut and connected to the screw nut, and a lifting connection plate and a screw push plate arranged at both ends of the ball screw;

[0017] The upper fixed plate is located between the lifting connecting plate and the lead screw push plate;

[0018] The expansion type synchronous wheel is connected to the reducer through a synchronous belt;

[0019] The ball screw is provided with a screw anti-rotation optical axis on both sides; the screw anti-rotation optical axis passes through the upper fixed plate and the upper and lower ends are respectively connected to the lifting connecting plate and the upper fixed plate; the screw push plate is connected to the screw anti-rotation optical axis through a linear bearing.

[0020] A pressure sensor is arranged on the push plate below the lead screw push plate; a limiting sleeve is arranged between the lead screw push plate and the push plate.

[0021] Opposing sensor structures are arranged on both sides of the multi-layer follower pressure plate structure; the opposing sensor structure comprises a fixing rod and a plurality of opposing sensors arranged on the fixing rod.

[0022] The fixing rod is provided with a plurality of adjusting fixing rings; the through-beam sensor is connected with the adjusting fixing rings via a fixing sheet metal.

[0023] The upper and lower ends of each layer of follower pressing plate are provided with contact pressing plates or hot pressing plates.

[0024] A limited position fixing block is arranged on each layer of the follower pressure plate; the pin bolt is connected to the limited position fixing block via a fixing joint.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The multi-layer pressing mechanism of the present application adopts a double-sided cross-link structure, which increases the structural strength of the connecting rod arm, has the function of lifting and lowering the follower pressure plates of each layer, and has the function of transmitting pressure. When there is no pole group or battery cell between two layers of follower pressure plates, the remaining follower pressure plates can still press the pole group or battery cell. As a preferred form, cylindrical roller bearings are set at the connecting ends of each connecting rod to eliminate sliding friction, ensure reliable transmission and high transmission efficiency.

[0027] The multi-layer pressing mechanism of the present application has high versatility and good compatibility. By changing the model, it can be compatible with hot pressing of the electrode group, short circuit detection and restraint of the battery cell, and helium return restraint. It is easy to operate, and adopts a cross-link structure to connect the various layer structures to transmit the pressing force. When the product is changed, there is no need to disassemble and replace any parts. It has a simple structure, low manufacturing cost, and wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the multi-layer compression structure of the embodiment of the utility model;

[0029] FIG2 (a) is an exploded schematic diagram of a cross-link structure of a multi-layer compression structure according to an embodiment of the present invention;

[0030] FIG2 (b) is a schematic diagram of the assembly of the cross-link structure of the multi-layer compression structure of the embodiment of the utility model;

[0031] Figure 3 A cross-sectional view of a screw lifting structure of a multi-layer pressing structure according to an embodiment of the utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the through-beam sensor of the multi-layer compression structure of the embodiment of the utility model;

[0033] Figure 5 A schematic diagram of a follower plate structure of a multi-layer compression structure according to an embodiment of the utility model;

[0034] Figure 6 A schematic diagram of using the multi-layer compression structure of an embodiment of the utility model to compress a battery cell;

[0035] Figure 7 This is a flow chart of the battery cell pressing procedure of the embodiment of the utility model;

[0036] Figure 8 A schematic diagram of hot pressing of an electrode group using the multi-layer pressing structure of an embodiment of the utility model;

[0037] Fig. 9 This is a flow chart of the hot pressing procedure of the electrode group in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment.

[0039] Figure 1-5 A multi-layer clamping structure is shown, including a lower fixed plate 6, an upper fixed plate 9, a multi-layer follower pressure plate structure 5 arranged between the upper fixed plate 9 and the lower fixed plate 6, and a power unit providing power to the multi-layer follower pressure plate structure; the lower fixed plate 6 is arranged on a fixed large plate 7.

[0040] The multi-layer follower pressure plate structure 5 includes a push plate 10, a multi-layer follower pressure plate 501, a supporting optical axis connecting the push plate 10 and the follower pressure plate 501 and between the follower pressure plates, and a cross-link structure 2 for realizing the linkage between the push plate 10 and the follower pressure plate 501 and between the follower pressure plates 501.

[0041] The supporting optical axes are respectively a first supporting optical axis 101, a second supporting optical axis 102, a third supporting optical axis 103, and a fourth supporting optical axis 104;

[0042] The cross-link structure 2 is composed of two groups, which are respectively arranged on the left and right sides of the multi-layer follower pressure plate structure 5.

[0043] FIG2 shows a cross-link structure 2 , wherein (a) is an exploded view and (b) is an assembled view;

[0044] The cross-link structure 2 includes short link units arranged at the head and tail and a plurality of long link units arranged in the middle; the long link unit is composed of two long links cross-connected; a pin bolt mounting hole is arranged in the middle of the long link, and connecting rod pin mounting holes are arranged at the head and tail ends, and the pin bolt mounting hole in the middle connects the two cross-linked long links through a pin bolt 205; the connecting rod pin mounting holes at the head and tail ends cross-connect the long links of adjacent long link units;

[0045] The pin bolt 205 connected to the long connecting rod is connected to the follower pressure plate 501;

[0046] The short connecting rod unit is composed of two short connecting rods connected crosswise: one end of the short connecting rod is provided with a connecting rod pin mounting hole, and the other end is provided with a pin shaft bolt mounting hole; the connecting rod pin mounting hole connects the short connecting rod and the adjacent long connecting rod through a connecting rod pin, and a pin shaft bolt 205 is provided in the pin shaft bolt mounting hole to connect the crossed short connecting rods;

[0047] The pin bolts 205 provided in the top short connecting rod unit and the bottom short connecting rod unit are connected to the push plate 10 and the lower fixing plate 6 respectively.

[0048] The connecting rod pin mounting hole and the pin bolt mounting hole are independently provided with roller bearings 201, and the roller bearings are used to convert the sliding friction between the connecting ends into rolling friction, thereby improving the transmission efficiency and increasing the service life of the connecting ends (equipment); a washer 206 is provided in the pin bolt mounting hole, and the washer 206 is inserted into the pin bolt 205 to prevent the roller bearing 201 from falling out of the connecting rod fixed end.

[0049] As an illustrative embodiment of the present application, there are three long connecting rod units; therefore, six long connecting rods are provided, namely, a first long connecting rod 2041, a second long connecting rod 2042, a third long connecting rod 2043, a fourth long connecting rod 2044, a fifth long connecting rod 2045, and a sixth long connecting rod 2046; two short connecting rod units are provided at the head and tail; four short connecting rods are provided, namely, a first short connecting rod 2021, a second short connecting rod 2022, a third short connecting rod 2023, and a fourth short connecting rod 2024;

[0050] The cross link structure 2 is installed in the following manner: the upper connecting ends of the first short link 2021 and the second short link 2022 are aligned, the washers 206 are placed, and the pin bolts 205 are inserted; the lower connecting ends of the two are respectively inserted into the connecting rod pins 207, and then respectively inserted into the upper connecting ends of the first long link 2041 and the second long link 2042. The middle connecting ends of the first long link 2041 and the second long link 2042 are aligned, the washers 206 are placed, the pin bolts 205 are inserted, and then locked and fixed with the fixed joint 203; the lower connecting ends of the two are respectively inserted into the connecting rod pins 207, and then respectively inserted into the upper connecting ends of the fourth long link 2044 and the third long link 2043. The middle connecting ends of the third long connecting rod 2043 and the fourth long connecting rod 2044 are aligned, and washers 206 are placed, and the pin bolts 205 are inserted, and then the fixed joint 203 is locked and fixed; the lower connecting ends of the two are respectively inserted into the connecting rod pin 207, and then the upper connecting ends of the sixth long connecting rod 2046 and the fifth long connecting rod 2045 are respectively inserted; the middle connecting ends of the fifth long connecting rod 2045 and the sixth long connecting rod 2046 are aligned, washers 206 are placed, and the pin bolts 205 are inserted, and then the fixed joint 203 is locked and fixed; the lower connecting ends of the two are respectively inserted into the connecting rod pin 207, and then the upper connecting ends of the fourth short connecting rod 2024 and the third short connecting rod 2023 are respectively inserted; the lower connecting ends of the third short connecting rod 2023 and the fourth short connecting rod 2024 are aligned, washers 206 are placed, and the pin bolts 205 are inserted. At this point, the cross connecting rod structure 2 is assembled.

[0051] The power unit includes a motor 1, a reducer 8 connected to the motor 1, and a screw lifting structure 3 connected to the reducer ( Figure 3 The lead screw lifting structure is installed at the pressure center of the multi-layer pressing structure, and is used to output the pressing force, drive the follower plate structure to move, and detect the pressing force value;

[0052] The screw lifting mechanism 4 includes a bearing seat 305 arranged on the upper fixed plate 9, a deep groove ball bearing 306 arranged in the bearing seat 305, a screw nut 308 arranged in the deep groove ball bearing 306, a ball screw 303 arranged in the screw nut 308 and connected to the screw nut 308, an expansion type synchronous wheel 304 arranged outside the screw nut 308 and connected to the screw nut 308, and a lifting connection plate 301 and a screw push plate 310 arranged at both ends of the ball screw 303; the upper fixed plate 9 is located between the lifting connection plate 301 and the screw push plate 310;

[0053] The expansion type synchronous wheel 304 is connected to the reducer 8 through a synchronous belt; screw stop optical axis 302 is set on both sides of the ball screw 303; the screw stop optical axis 302 passes through the upper fixed plate 9 and the upper and lower ends are respectively connected to the lifting connecting plate 301 and the upper fixed plate 9; the screw push plate 310 is connected to the screw stop optical axis 302 through a linear bearing.

[0054] A pressure sensor 312 is disposed on the push plate 10 below the lead screw push plate 310 ; a limiting sleeve 311 is disposed between the lead screw push plate 310 and the push plate 10 .

[0055] The lifting connecting plate 301 is installed on the top of the two lead screw anti-rotation optical axes 302, and is used to improve the structural stability of the lead screw anti-rotation optical axes 302 and prevent it from rotating; the lead screw anti-rotation optical axes 302 are installed on both sides of the ball screw 303 and are arranged symmetrically to ensure that the ball screw 303 moves axially; the ball screw 303 is set at the pressure center of the mechanism, and is used to convert the rotational torque of the motor 1 into a clamping force and a pulling force; the expansion type synchronous wheel 304 is installed on the upper end of the lead screw nut 308, and forms a synchronous belt transmission structure with the synchronous belt and the driving synchronous wheel to drive the lead screw nut 308 to rotate; the deep groove ball bearing 306 is installed at the upper and lower ends of the bearing seat 305, and is used to improve the transmission efficiency of the servo motor's rotational torque and fix the lead screw nut 308; the lead screw push plate 310 is used to transmit the clamping force and the pulling force.

[0056] The lead screw lifting structure 3 is assembled in the following manner: four linear bearings, two lead screw anti-rotation optical axes 302, and a pressure sensor 312 are respectively installed on the push plate 10, and then the first support optical axis 101, the second support optical axis 102, the third support optical axis 103, and the fourth support optical axis 104 are inserted. The lead screw push plate 310 is installed with a third linear bearing 3143 and a fourth linear bearing 3144, which are integrally inserted into the two lead screw anti-rotation optical axes 302, and then locked and fixed with the push plate 10 through four limit sleeves 311.

[0057] The deep groove ball bearing 306 is installed into the bearing mounting holes at both ends of the bearing seat 305; the two bearing end covers 307 respectively fasten the outer rings of the two deep groove ball bearings 306, and then are locked and fixed with the bearing seat 305. The lead screw nut 308 is inserted into the inner ring of the deep groove ball bearing 306 in the bearing seat 305; then, the blocking washer is inserted, the expansion type synchronous wheel 304 is inserted, and locked and held with the lead screw nut 308. The two lead screw connecting flanges 309 are respectively locked and fixed with the two shaft ends of the ball screw 303;

[0058] The upper end surface of the upper fixed plate 9 is installed with the first linear bearing 3141 and the second linear bearing 3142, which are integrally inserted into the two screw anti-rotation optical axes 302; the lower end surface is locked and fixed with the top of each supporting optical axis. The screw connection flange 309 fixed at the lower end of the ball screw 303 is locked and fixed with the screw push plate 310; the bearing seat 305 is locked with the upper fixed plate 9; finally, the lifting connection plate 301 is fixed with the upper ends of the two screw anti-rotation optical axes 302 respectively, and then locked with the screw connection flange 309 fixed at the upper end of the ball screw 303. At this point, the screw lifting structure 3 is assembled.

[0059] The multi-layer follow-up pressure plate structure 5 is provided with a corresponding sensor structure 4 on both sides. Figure 4 As shown); the through-beam sensor structure 4 includes a fixed rod, and a plurality of through-beam sensors 403 arranged on the fixed rod. The fixed rod is provided with a plurality of adjustment fixing rings 404; the through-beam sensor 403 is connected to the adjustment fixing ring 404 via a fixed sheet metal 405. As an embodiment of the present application, the fixed rod includes a left fixed rod 401 and a right fixed rod 402; the through-beam sensor 403 is used to detect the presence or absence of a pole group or a battery cell; the adjustment fixing ring 404 is installed on the fixed rod and is used to adjust the sensor height and the through-beam angle;

[0060] The through-beam sensor structure 4 is assembled in the following manner: the left fixed rod 401 and the right fixed rod 402 are spaced apart from the main structure and arranged diagonally on the fixed large plate 7. Four adjustable fixed rings 404 are sleeved and fixed on the left fixed rod 401, and the other four adjustable fixed rings 404 are sleeved and fixed on the right fixed rod 402. The through-beam sensor 403 is installed on the fixed sheet metal 405 and locked with the adjustable fixed rings 404. At this point, the through-beam sensor structure 4 is assembled.

[0061] Figure 5 The following pressure plate is shown, and three layers are taken as an example in this application. The upper and lower ends of the following pressure plate 501 of each layer are provided with contact pressure plates 503. A limited position fixing block 502 is provided on the following pressure plate 501 of each layer; the pin bolt 205 is connected to the limited position fixing block 502 through a fixing joint 203.

[0062] The multi-layer follower platen is installed in the following manner: two contact plates 503 (or hot plates 602) are installed on the upper and lower end surfaces of the follower plate 501; two limit fixing blocks 502 are spaced apart from the contact plates 503 and locked at the edge of the follower plate 501. The first follower linear bearing 5041, the second follower linear bearing 5042, the third follower linear bearing 5043, and the fourth follower linear bearing 5044 are respectively inserted into the machined holes around the 501 follower plate and locked and fixed to each other.

[0063] The limit fixing blocks 502 are four in total, which are respectively installed on the edges of the upper and lower end surfaces of the follower plate, and are used in conjunction with the fixing joint 203 to drive the follower plate structure to reciprocate; the contact pressure plate 503 is two in total, made of Teflon material, and is respectively installed on the upper and lower end surfaces of the follower plate 501 to contact the battery housing; the upper fixing plate 9 is installed on the top of the first to fourth supporting optical axes, and is the basic installation plate for the power unit and the screw substructure. The push plate 10 is the basic installation plate for the pressure sensor and the limit sleeve, and is used to drive the follower plate structure to perform mechanical movement.

[0064] The mechanical movement process of the multi-layer compression structure is as follows:

[0065] The power unit composed of motor 1 (servo motor) and reducer 8 outputs torque, drives the expansion type synchronous wheel 304 connected to the screw nut 308 to rotate, and the screw nut 308 rotates on the bearing seat 305, driving the ball screw 303 to move downward, pushing the screw push plate 301 to contact the pressure sensor 312, and the push plate 10 moves downward along the supporting optical axis, compressing the cross-link structure 2, driving the follower layer structure 5 to move downward synchronously, and finally pressing the pole group or battery cell. The pressure sensor 312 outputs the pressure value to the PLC. When the pressure value reaches the set value, the PLC controls the motor 1 to stop rotating; after the pressing (hot pressing) time reaches the set value, the motor reverses, the screw push plate 301 pulls the limit sleeve 311, drives the push plate 10 to move upward, unfolds the cross-link structure 2, and drives each follower layer 501 to move upward at an equal distance.

[0066] Embodiment 1: Figure 6 The multi-layer clamping structure of the present application is used to clamp the battery cell. The implementation process is as follows: the battery cell 601 is placed on each contact pressure plate 503 of the multi-layer follower pressure plate structure 5, and the corresponding sensor structure 4 detects that the battery cell is in place; the motor 1 rotates forward, drives the synchronous pulley structure to rotate, drives the screw nut 308 to rotate on the bearing seat 305, and the ball screw 303 moves downward, pushing the screw push plate 301 to contact the pressure sensor 312; the push plate 10 moves downward along the supporting optical axis, compresses the cross-link structure 2, and drives each follower layer plate structure 5 to move downward synchronously, and finally clamps the battery cell. The pressure value output by the pressure sensor 312 to the PLC reaches the set value, the PLC controls the motor 1 to stop rotating, and the program starts to count the clamping time. After the clamping time reaches the set value, the motor 1 reverses, the screw push plate 301 structure pulls the limit sleeve 311, drives the push plate 10 to move upward, unfolds the cross-link structure 2, and drives each follower layer plate 501 to move upward at an equal distance. When the push plate 10 reaches the stop position sensor detection position, the motor 1 stops rotating. When the motor is running upward and downward, the upper and lower limit detection are set for emergency stop protection to prevent equipment damage caused by over-limit operation. Figure 7 Flowchart of the cell pressing procedure.

[0067] Embodiment 2: Figure 8 The multi-layer clamping structure of the present application is used to hot-press the electrode group. The implementation process is as follows: the electrode group 603 is placed on each hot pressing plate 602 of the multi-layer follower plate structure, and the hot pressing plate 602 is preheated synchronously. The shooting sensor structure 4 detects that the electrode group is in place; the motor 1 rotates forward, drives the synchronous belt structure to rotate, drives the screw nut 308 to rotate on the bearing seat 305, and the ball screw 303 moves downward, pushing the screw push plate 301 to contact the pressure sensor 312; the push plate 10 moves downward along the supporting optical axis, compresses the cross-link structure 2, and drives the three-layer follower plate 501 to move downward synchronously, and finally compresses the electrode group. The pressure value output by the pressure sensor 312 to the PLC reaches the set value. At the same time, after the hot pressing plate 602 is heated to the set temperature, the PLC controls the servo motor to stop rotating, and the program starts timing the clamping time. After the clamping time reaches the set value, the motor 1 reverses, the lead screw push plate 301 structure pulls the limit sleeve 311, drives the push plate 10 to move upward, unfolds the cross link structure 2, and drives each follower layer 501 to move upward at an equal distance. The push plate 10 reaches the stop position sensor detection position, and the motor 1 stops rotating. During the upward and downward movement of the motor, the upper and lower limit detections are set for emergency stop protection to prevent equipment damage caused by over-limit operation. See for details Fig. 9 Flow chart of the electrode group hot pressing procedure.

[0068] The multi-layer pressing mechanism of the present application adopts a double-sided cross-link structure, which increases the structural strength of the connecting rod arm, has the function of lifting and lowering the follower pressure plates of each layer, and has the function of transmitting pressure. When there is no pole group or battery cell between two layers of follower pressure plates, the remaining follower pressure plates can still press the pole group or battery cell. As a preferred form, cylindrical roller bearings are set at the connecting ends of each connecting rod to eliminate sliding friction, ensure reliable transmission and high transmission efficiency.

[0069] From the above, it can be seen that the multi-layer clamping mechanism of the present application has high versatility and good compatibility. By changing the model, it can be compatible with hot pressing of the electrode group, short circuit detection and restraint of the battery cell, and helium return restraint. It is easy to operate, and adopts a cross-link structure to connect each layer structure to transmit the clamping force. When the product is changed, there is no need to disassemble and replace any parts. It has a simple structure, low manufacturing cost, and wide application.

[0070] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A multi-layer compression structure, characterized in that: It includes a lower fixed plate, an upper fixed plate, a multi-layer follower pressure plate structure arranged between the upper fixed plate and the lower fixed plate, and a power unit that provides power for the multi-layer follower pressure plate structure; the multi-layer follower pressure plate structure includes a push plate, a multi-layer follower pressure plate, a supporting optical axis connecting the push plate and the follower pressure plate and between the follower pressure plates, and a cross-link structure that realizes the linkage between the push plate and the follower pressure plate and between the follower pressure plates.

2. The multi-layer compression structure according to claim 1, characterized in that: The cross-link structure comprises two groups, which are respectively arranged on the left and right sides of the multi-layer follower pressure plate structure.

3. The multi-layer compression structure according to claim 2, characterized in that: The cross-link structure includes short link units arranged at the head and tail and a plurality of long link units arranged in the middle; The long connecting rod unit is composed of two long connecting rods connected crosswise; a pin bolt mounting hole is arranged in the middle of the long connecting rod, and connecting rod pin mounting holes are arranged at both ends; the pin bolt mounting hole in the middle connects the two crossed long connecting rods through the pin bolt; the connecting rod pin mounting holes at both ends crosswise connect the long connecting rods of the adjacent long connecting rod units; The pin bolt connected to the long connecting rod is connected to the follower pressure plate; The short connecting rod unit is composed of two short connecting rods connected crosswise: a connecting rod pin mounting hole is provided at one end of the short connecting rod, and a pin bolt mounting hole is provided at the other end; the connecting rod pin mounting hole connects the short connecting rod and the adjacent long connecting rod through a connecting rod pin, and a pin bolt is provided in the pin bolt mounting hole to connect the crossed short connecting rods; the pin bolts arranged in the top short connecting rod unit and the bottom short connecting rod unit are respectively connected to the push plate and the lower fixed plate.

4. The multi-layer compression structure according to claim 3, characterized in that: The connecting rod pin mounting hole and the pin shaft bolt mounting hole are independently provided with roller bearings; and washers are provided in the pin shaft bolt mounting holes.

5. The multi-layer compression structure according to claim 1, characterized in that: The power unit includes a motor, a reducer connected to the motor, and a screw lifting structure connected to the reducer; the screw lifting mechanism includes a bearing seat arranged on the upper fixed plate, a deep groove ball bearing arranged in the bearing seat, a screw nut arranged in the deep groove ball bearing, a ball screw arranged in the screw nut and connected to the screw nut, an expansion type synchronous wheel arranged outside the screw nut and connected to the screw nut, and a lifting connection plate and a screw push plate arranged at both ends of the ball screw; The upper fixed plate is located between the lifting connecting plate and the lead screw push plate; The expansion type synchronous wheel is connected to the reducer through a synchronous belt; The ball screw is provided with a screw anti-rotation optical axis on both sides; the screw anti-rotation optical axis passes through the upper fixed plate and the upper and lower ends are respectively connected to the lifting connecting plate and the upper fixed plate; the screw push plate is connected to the screw anti-rotation optical axis through a linear bearing.

6. The multi-layer compression structure according to claim 5, characterized in that: A pressure sensor is arranged on the push plate below the lead screw push plate; a limiting sleeve is arranged between the lead screw push plate and the push plate.

7. The multi-layer compression structure according to claim 1, characterized in that: Opposing sensor structures are arranged on both sides of the multi-layer follower pressure plate structure; the opposing sensor structure comprises a fixing rod and a plurality of opposing sensors arranged on the fixing rod.

8. The multi-layer compression structure according to claim 7, characterized in that: The fixing rod is provided with a plurality of adjusting fixing rings; the through-beam sensor is connected with the adjusting fixing rings via a fixing sheet metal.

9. The multi-layer compression structure according to claim 1, characterized in that: The upper and lower ends of each layer of follower pressing plate are provided with contact pressing plates or hot pressing plates.

10. The multi-layer compression structure according to claim 3, characterized in that: A limited position fixing block is arranged on each layer of the follower pressure plate; the pin bolt is connected to the limited position fixing block via a fixing joint.

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