CN212412108U

CN212412108U - Battery pole piece thermal compounding device and battery lamination equipment

Info

Publication number: CN212412108U
Application number: CN202021262024.1U
Authority: CN
Inventors: 赵凯; 郑赫; 王玉涛; 李昆芃
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-01-26
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a battery pole piece thermal recombination device and battery lamination equipment, the utility model provides a battery pole piece thermal recombination device includes main actuating mechanism and heat seal mechanism. The main driving mechanism is provided with two groups of driving units which are respectively arranged above and below the battery pole piece and form clamping and anisotropic rotation on the battery pole piece so as to drive the battery pole piece to move; the heat seal mechanism is arranged at the upstream of the main driving mechanism along the advancing direction of the battery pole piece and is provided with two groups of heating belts which are respectively arranged at the upper part and the lower part of the battery pole piece and sleeved on the rotating roller which can rotate freely and can rotate back and forth; the two heating belts are provided with heating parts capable of increasing the temperature of the heating belts, and the heating parts are tightly attached to the battery pole pieces and rotate along with the advancing of the battery pole pieces so as to form heating and pressing on the battery pole pieces. The utility model discloses a hot set composite of battery sheet can optimize the drive configuration of the hot set composite of battery sheet to promote the uniformity of the battery sheet that is formed by pole piece and diaphragm at heating pressfitting and the in-process speed of marcing.

Description

Battery pole piece thermal compounding device and battery lamination equipment

Technical Field

The utility model relates to a lithium ion equipment technical field, in particular to battery pole piece thermal recombination device. The utility model discloses still relate to a battery lamination equipment.

Background

In the industrial environment of automobiles using traditional energy as power supply, the problem of environmental pollution has led to attention on environmental protection and resource utilization. The active development of new energy automobiles realizes the electrification of the automobile industry, and is a strategic measure for realizing the aim of 'curve overtaking' of the automobile industry in China.

The lithium ion equipment technology is a key technology for the development of electric automobiles. The square lamination technology is one of the most advanced lithium ion battery manufacturing technologies at present, wherein the lamination speed directly determines the whole line productivity and the cell manufacturing cost.

At present, the Z-type lamination technology is mostly adopted, the fastest lamination speed in mass production is 0.6 s/piece, the lamination method is slow in speed, the demand of the number of equipment is large, the occupied area is large, the purchase cost is high, the later maintenance cost and the energy consumption are large, and therefore, a thermal composite lamination mode capable of stacking multiple thermal composite laminations simultaneously becomes the development trend of the lamination technology. But the method is limited by the defects that the alignment degree is difficult to ensure in a common rolling type composite mode, a mature detection scheme is not available, and the problem of pole piece end face fracture exists, so far, the method cannot be used in large batch.

The existing pole piece and diaphragm need to be heated and pressed, the formed battery pole piece needs to move on a processing line, so that a large number of rollers need to be used, and the rollers at multiple positions need to be driven to rotate so as to enable each link to normally operate; this not only needs to dispose driving motor more, and often can produce each link rotational speed inconsistent, and then leads to the battery pole piece to pile up or tear the problem of dragging.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a battery pole piece heat set composite to optimize battery pole piece heat set composite's drive configuration, promote the uniformity of the battery pole piece that is formed by pole piece and diaphragm at heating pressfitting and the in-process speed of marcing.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a battery pole piece heat set composite for with pole piece and the battery pole piece pressfitting as an organic whole that the diaphragm coincide formed, include:

the main driving mechanism is provided with two groups of driving units which are respectively arranged above and below the battery pole piece and form clamping on the battery pole piece, and the two driving units rotate in different directions to form driving on the advancing of the battery pole piece;

the heat seal mechanism is arranged at the upstream of the main driving mechanism along the advancing direction of the battery pole piece and is provided with two groups of heating belts which are respectively arranged on the upper part and the lower part of the battery pole piece, sleeved on a rotating roller capable of rotating freely and capable of rotating in a reciprocating manner; the two heating belts are provided with heating parts capable of increasing the temperature of the heating belts, and the heating belts are tightly attached to the battery pole pieces and rotate along with the battery pole pieces so as to form heating and pressing of the battery pole pieces.

Furthermore, the driving unit comprises a driven roller and a driving roller which are arranged at intervals, and a driving belt which is sleeved on the driven roller and the driving roller, and the driving belt rotates in a reciprocating manner along with the rotation of the driving roller, so that the driving unit drives the battery pole piece to advance.

Furthermore, the rotating rollers are an inlet rotating roller and an outlet rotating roller which are arranged at intervals, and the radial size of the inlet rotating roller on the upstream of the advancing direction is smaller than that of the outlet rotating roller.

The device further comprises two groups of PET film mechanisms which are arranged above and below the battery pole piece, wherein each PET film mechanism comprises a film collecting and releasing rotating roller and a PET film arranged on the film collecting and releasing rotating roller; the PET film is led out from the film collecting and releasing roller, is converged at the upstream of the heat sealing mechanism, is attached to the upper surface or the lower surface of the battery pole piece, is separated from the downstream of the main driving mechanism and is led back to the film collecting and releasing roller.

Further, the film collecting and releasing roller comprises a film collecting roller which is wound with the PET film and can rotate freely, and a film collecting roller which can drive to rotate so as to wind up the PET film and lead the PET film back.

Furthermore, a tensioning unit is provided on the PET film before the joining and/or after the separating, said tensioning unit forming a tension on the passing PET film under a predetermined force.

The cutting mechanism is arranged at the upstream of the heat seal mechanism, and the pole piece led out by the pole piece unwinding mechanism and the diaphragm led out by the diaphragm unwinding mechanism are separately gathered into the cutting mechanism; a guide roller set and cutting blades capable of cutting the pole pieces at equal length are arranged in the cutting mechanism, the guide roller set rotates under the driving of the diaphragm and forms guide for the pole pieces at the upstream of the cutting blades; the pole piece and the diaphragm passing through the cutting mechanism are overlapped to form the battery pole piece.

Furthermore, a guide roller which is spaced from the heat sealing mechanism and forms a guide for the battery pole piece is arranged at the upstream of the heat sealing mechanism; the battery pole piece thermal compounding device also comprises a CCD detection unit which is arranged between the guide roll and the thermal compounding mechanism and used for detecting the pole pieces cut into sections.

Further, in the traveling direction, the length of a portion of the main drive mechanism constituting a nip portion for the battery pole piece is three times or more the length of the pole piece cut into sections; the distance between the guide roll and the heat sealing mechanism is smaller than the length of the pole piece cut into sections in the advancing direction.

Compared with the prior art, the utility model discloses following advantage has:

(1) battery pole piece heat set composite, adopt the drive unit who rotates and centre gripping battery pole piece to advance in order to order about battery pole piece to through heat seal mechanism, drive the follow-up rotation of heating tape in heat seal mechanism in the in-process through heat seal mechanism, thereby make heat seal mechanism accomplish the heating pressfitting to battery pole piece, driven configuration is succinct effective, the synchronism is good, does benefit to the uniformity that promotes the battery pole piece that is formed by pole piece and diaphragm at heating pressfitting and the in-process speed of advancing.

(2) The driving unit adopts a mode that the driving belt is sleeved on the driven roller and the driving roller, so that the clamping area of the battery pole piece can be effectively increased, and the advancing effect of the battery pole piece is improved.

(3) The rotating roller is assembled by an input end rotating roller with a small size and an output end rotating roller with a large size, and not only is the pressing force on one side of the output end rotating roller increased, but also a heating component with large heating power is convenient to arrange in a heating belt surrounding space close to the output end rotating roller, so that the heating intensity and the pressing force of the battery pole piece during the heat seal process are gradually increased in a matched manner, and the heat seal effect is favorably improved.

(4) The PET membrane mechanism is arranged, so that when the battery pole piece passes through the heat sealing mechanism and the main driving mechanism, the upper surface and the lower surface of the battery pole piece are attached with a layer of transparent PET membrane with good protection and tensile property, the driving capability of the battery pole piece to the upstream mechanism of the main driving mechanism in the advancing process can be improved, and good protection can be formed for the self of the pole piece and the maintenance of the overlapping position of the pole piece on the diaphragm.

(5) The PET film is discharged by using the film discharging roller, and the separated PET film is collected by rotating the film collecting roller matched with the advancing speed of the battery pole piece, so that the whole arrangement of the PET film mechanism is flexible and simple, and the technical implementation is convenient.

(6) The tension unit is additionally arranged on the PET film, so that the adverse effect on the sudden change of the pulling force of the PET film when the drawing or withdrawing speed of the PET film is inconsistent with the advancing speed of the battery pole piece can be improved.

(7) The cutting mechanism can realize good guide to the pole pieces before and after being cut through the arrangement of the guide roller group, so that the pole pieces can be cut in advance before heat seal, and a single lamination sheet monomer for the lamination process is produced by the device.

(8) A guide roller is arranged at the upstream of the heat seal mechanism, and a guide roller in the cutting mechanism can also be combined into a whole, so that the pole piece and the diaphragm are collected, superposed and guided to form a battery pole piece to enter the heat seal mechanism; a CCD detection unit is additionally arranged between the guide roller and the heat sealing mechanism, and the detection of the pole piece and the overlapping position of the pole piece on the diaphragm can be completed before heat sealing, so that the quality of a product after heat sealing is guaranteed.

(9) The distance between the guide roll and the heat sealing mechanism is set to be smaller than the length of the cut pole piece, so that the pole piece and the diaphragm can be clamped and fixed before the pole piece is heat sealed on the diaphragm, and the position of the cut pole piece on the diaphragm is prevented from changing; the clamping length of the main driving mechanism is set to be more than three times of the length of the pole piece after cutting, so that the battery pole piece can have enough further pressing process and driving stress area.

Another object of the utility model is to provide a battery lamination equipment for press the battery pole piece and lamination with pole piece and diaphragm, use in the battery lamination equipment and have the battery pole piece heat set composite.

Compared with the prior art, the utility model provides a battery lamination equipment has the utility model provides a battery sheet heat recombination device possesses technical advantage.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

fig. 1 is a schematic view of a system configuration of a battery pole piece thermal compound device according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the overall structure of a battery stacking apparatus according to an embodiment of the present invention;

fig. 3 is a schematic configuration diagram of a cutting mechanism shown by reference numeral 3 in fig. 1;

FIG. 4 is an enlarged view of a portion A of FIG. 1;

FIG. 5 is a partial enlarged view of the portion indicated by C in FIG. 4;

FIG. 6 is a partial enlarged view of the portion indicated by B in FIG. 1;

description of reference numerals:

1-pole piece unwinding mechanism, 101-first pole piece, 102-second pole piece, 120-battery pole piece, 121-cutting notch, 2-diaphragm unwinding mechanism, 201-diaphragm, 3-cutting mechanism, 301-leading-in roller set, 302-leading-in matching roller, 303-cutting knife seat, 304-cutting knife plate, 305-cutting knife, 306-leading-out roller and 307-adjusting cylinder;

40-film releasing roller, 400-PET film, 401-guide roller, 411-steering roller, 412-tensioning roller, 42-film collecting roller, 5-CCD detection unit, 6-heat sealing mechanism, 600-heating belt, 601-input end rotating roller, 602-output end rotating roller, 7-main driving mechanism, 700-driving belt, 701-driven roller and 702-driving roller;

8-tension roller, 801-buffer mechanism, 802-secondary drive roller group, 803-turret mechanism, 804-robot, 805-lamination mechanism.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, terms of left, right, up, down, and the like are used for convenience of description and are based on terms in the illustrated state, and should not be construed as limiting the structure of the present invention; references to first, second, third, etc. are also made for ease of description and are not to be construed as indicating or implying relative importance.

The embodiment relates to a thermal compound device of a battery pole piece, which can optimize the driving configuration of the thermal compound device of the battery pole piece and improve the consistency of the advancing speed of the battery pole piece formed by the pole piece and a diaphragm in the heating, pressing and advancing processes. The battery pole piece thermal compounding device is used for pressing battery pole pieces into a whole, and the battery pole pieces are formed by jointly laminating pole pieces and diaphragms. The device comprises a main driving mechanism and a heat sealing mechanism; the main driving mechanism is provided with two groups of driving units which are respectively arranged above and below the battery pole piece and form clamping and anisotropic rotation on the battery pole piece so as to drive the battery pole piece to advance; the heat seal mechanism is arranged at the upstream of the main driving mechanism along the advancing direction of the battery pole piece and is provided with two groups of heating belts which are respectively arranged above and below the battery pole piece, sleeved on a rotating roller capable of rotating freely and capable of rotating back and forth; the two heating belts are provided with heating parts capable of increasing the temperature of the heating belts, and the heating belts are tightly attached to the battery pole pieces and rotate along with the advancing of the battery pole pieces so as to form heating and pressing of the battery pole pieces.

Based on the general design principles described above, the present invention will be described in detail below with reference to the accompanying drawings and embodiments. An exemplary system configuration of the battery pole piece thermal compound device of the present embodiment is shown in fig. 1, and an exemplary system configuration of the battery lamination apparatus of the present invention is shown in fig. 2; the battery pole piece thermal compounding device is arranged at the upstream section of battery lamination equipment and mainly comprises a heat sealing mechanism 6 and a main driving mechanism 7, and a cutting mechanism 3 can be arranged at the upstream of the heat sealing mechanism 6.

As shown in fig. 1 and fig. 2, two sets of pole piece unwinding mechanisms 1 may be disposed at the beginning of the battery lamination device in an up-down symmetrical manner, and a first pole piece 101 and a second pole piece 102 are respectively sleeved on the pole piece unwinding mechanisms in a coiled manner to serve as a positive pole piece and a negative pole piece. The middle of the two pole piece unwinding mechanisms 1 is provided with a diaphragm unwinding mechanism 2, and a diaphragm 201 is sleeved on the diaphragm unwinding mechanism 2 in a coiled manner. Of course, in addition to the case where the positive electrode sheet and the negative electrode sheet are included by making the electrode sheets two-layered, the case where only one electrode sheet is laminated with the separator 201 is also applicable to the thermal composite device described in the present embodiment.

As shown in fig. 3 and 4, the cutting mechanism 3 located upstream of the heat-sealing mechanism 6 separately collects the two pole pieces led from the two pole piece unwinding mechanisms 1 and the diaphragm 201 led from the diaphragm unwinding mechanism 2; a guide roller group and a cutting knife 305 capable of cutting the pole piece with equal length are arranged in the cutting mechanism 3, the guide roller group is driven by the diaphragm 201 to rotate and form the guide of the pole piece at the upstream of the cutting knife 305; the two pole pieces traveling through the cutting mechanism 3 are superimposed with the separator 201 to form the battery pole piece 120. The cutting mechanism 3 can realize good guide to the pole pieces before and after being cut through the arrangement of the guide roller group, thereby cutting the pole pieces in advance before heat seal, and enabling the device to produce single lamination single pieces for the lamination process.

In order to fold the heat-sealed battery pole piece 120 in the subsequent lamination process, a diaphragm 201 is arranged between two adjacent pole pieces, i.e. the adjacent first pole piece 101 and second pole piece 102 are also separated by the diaphragm 201 due to the folding, as shown in fig. 4, taking the advancing direction of the battery pole piece 120 as the width direction, the width dimension of the cut 121 between the cut pole pieces should be slightly longer than the width dimension of the cut pole pieces, preferably 2 mm. Thus, the diaphragm 201 of the part of the cut 121 is sandwiched between two adjacent pole pieces.

The arrangement form of the guide roller sets has various options, and as shown in fig. 3, the guide roller sets can be divided into two sets located above and below the diaphragm 201; each group comprises two leading-in roller sets 301 which are mutually attached and can be driven to rotate together, and a leading-in matching roller 302 which is positioned on the outer side of the first pole piece 101 or the second pole piece 102; the drawing roller set 301 attached to the diaphragm 201 is driven to rotate by the diaphragm 201, and the other drawing roller set 301 is driven to rotate, and the driven drawing roller set 301 and the drawing matching roller 302 clamp the first pole piece 101 or the second pole piece 102 and advance in a forward guiding manner. In order to achieve the width dimension requirement of the cutting edge 121, as shown in fig. 3, a regulating cylinder 307 can be added on the drawing roller group 301, and the drawing roller group 301 is intermittently regulated to separate from the diaphragm 201, so that the pole pieces are intermittently fed to obtain the width dimension required by the cutting edge 121.

Two sets of cutting blades 305 of the cutting mechanism 3 can be symmetrically arranged for cutting the first pole piece 101 and the second pole piece 102 respectively. The two cutting blades 305 may be fixed on the cutting blade holder 303, and a cutting blade plate 304 may be disposed corresponding to the cutting blade of the cutting blades 305, which can guide the advance of the first pole piece 101 and the second pole piece 102 and can support the cutting of the cutting blade. Two cutting blades 305 can perform a cutting action at fixed intervals to cut the pole piece, and the pole piece cut into segments is guided by a guide-out roller 306 downstream of the cutting blades 305 so that the two pole pieces and the diaphragm 201 are overlapped to form the battery pole piece 120.

As shown in fig. 4 and 5, a cut 121 is formed between the two pole pieces by cutting, but the separator 201 is not cut, so that the upper and lower pole pieces are attached to the separator 201 and travel together, and the separator 201 provides a pulling force for the travel of the battery pole piece 120. A guide roller 401 spaced apart from the heat-sealing mechanism 6 and forming a guide for the battery pole piece 120 is provided upstream of the heat-sealing mechanism 6; the battery pole piece thermal compounding device also comprises a CCD detection unit 5 which is arranged between the guide roller 401 and the thermal compounding mechanism 6 and is used for detecting the pole pieces cut into sections. A guide roller 401 is arranged at the upstream of the heat sealing mechanism 6, or a guide roller 306 and the guide roller 401 in the cutting mechanism 3 can be combined into a whole, so that the pole piece and the diaphragm 201 are gathered, overlapped and guided to form a battery pole piece 120 to enter the heat sealing mechanism 6; the CCD detection unit 5 is additionally arranged between the guide roller 401 and the heat sealing mechanism 6, so that the detection of the pole pieces and the overlapped positions of the pole pieces on the diaphragm 201 can be completed before heat sealing, and the quality of a product after heat sealing is guaranteed.

As shown in fig. 1, in this embodiment, the main driving mechanism 7 has two sets of driving units respectively disposed above and below the battery pole piece 120 and configured to clamp the battery pole piece 120, and the two driving units rotate in opposite directions, that is, in opposite directions, so that a movement tangent line at a contact position between the two driving units and the battery pole piece 120 is the same as a direction in which the battery pole piece 120 needs to travel, so as to drive the battery pole piece 120 to travel. The specific structure of the main driving mechanism 7 may be two groups of independent driving rollers 702 clamping the battery pole piece 120 to advance; preferably, as shown in fig. 6, the driving unit includes a driven roller 701 and a driving roller 702 which are arranged at intervals, and a driving belt 700 which is sleeved on the driven roller 701 and the driving roller 702, and the driving belt 700 rotates back and forth with the rotation of the driving roller 702 to form the driving of the battery pole piece 120 by the driving unit. By adopting the mode that the driving belt 700 is sleeved on the driven roller 701 and the driving roller 702, the clamping area of the battery pole piece 120 can be effectively increased, and therefore the effect of driving the battery pole piece 120 to advance is improved.

Along the advancing direction of the battery pole piece 120, the heat seal mechanism 6 is arranged at the upstream of the main driving mechanism 7 and is provided with two groups of heating belts 600 which are respectively arranged on the upper part and the lower part of the battery pole piece 120, sleeved on a rotating roller capable of rotating freely and capable of rotating back and forth; the two heating belts 600 are configured with heating components capable of raising their own temperature, and closely adhere to the battery pole piece 120 and rotate along with the advance of the battery pole piece 120. The surface of the diaphragm 201 is coated with heat-seal glue in advance, and due to the temperature of the heating belt 600 and the clamping pressure of the battery pole piece 120, the heating and pressing of the battery pole piece 120 can be formed, so that the two pole pieces and the diaphragm 201 are pressed into a whole. Preferably, the rotating rollers are an entry rotating roller 601 and an exit rotating roller 602 which are arranged at intervals, and the radial dimension of the entry rotating roller 601 positioned upstream in the traveling direction is smaller than that of the exit rotating roller 602. The assembly mode not only increases the pressing force on one side of the outlet rotating roller 602, but also facilitates the arrangement of heating components with higher heating power in the surrounding space of the heating belt 600 close to the outlet rotating roller 602, so that the heating and temperature rising strength and the pressing force of the battery pole piece 120 are gradually increased in a matching manner in the heat sealing process, and the improvement of the heat compounding effect is facilitated.

It should be noted that the lengths of the heat-sealing mechanism 6 and the main driving mechanism 7 in the direction in which the battery pole piece 120 travels can be flexibly adapted, but preferably, the length of the portion of the main driving mechanism 7 constituting the nip for the battery pole piece 120 is more than three times the length of the pole piece cut into sections; the distance between the guide roll 401 and the heat-sealing mechanism 6 is smaller than the length of the pole piece cut into segments in the traveling direction. The distance between the guide roller 401 and the heat sealing mechanism 6 is set to be smaller than the length of the cut pole piece, so that the clamping fixation between the pole piece and the diaphragm 201 can be kept before the pole piece is heat sealed on the diaphragm 201, and the position change of the cut pole piece on the diaphragm 201 can be prevented; the clamping length of the main driving mechanism 7 is set to be more than three times of the length of the pole piece after cutting, so that the battery pole piece 120 has enough further pressing process and driving stress area.

In addition, as shown in fig. 1 in combination with fig. 4 and fig. 6, in this embodiment, the battery pole piece thermal compound device further includes two PET film mechanisms disposed above and below the battery pole piece 120, where each PET film mechanism includes a film receiving and releasing roller and a PET film 400 disposed on the film receiving and releasing roller; the PET film 400 is led out from the film collecting and releasing roller, is converged at the upstream of the heat sealing mechanism 6, is attached to the upper surface or the lower surface of the battery pole piece 120, is separated from the downstream of the main driving mechanism 7 and is led back to the film collecting and releasing roller. The arrangement of the PET film mechanism can ensure that when the battery pole piece 120 passes through the heat sealing mechanism 6 and the main driving mechanism 7, the upper surface and the lower surface of the battery pole piece 120 are attached with a layer of transparent PET film 400 with good protection and tensile property, so that the driving capability of the battery pole piece 120 to an upstream mechanism of the main driving mechanism 7 in the advancing process can be improved, and good protection can be formed for the self of the pole piece and the maintaining of the overlapping position of the pole piece on the diaphragm 201.

Wherein, the film-collecting and releasing roller can be a plurality of matched guide rollers, so that the PET film 400 can rotate in a reciprocating way; the PET film 400 is separated from the main driving mechanism 7 and then converged into film collecting and releasing rollers, and then converged into the battery pole piece 120 from the front end of the heat sealing mechanism 6 after being guided by the film collecting and releasing rollers. In this embodiment, the film take-up and take-up roller includes a film take-up roller 40 wound with the PET film 400 and freely rotatable, and a film take-up roller 42 rotatably driven to take up the PET film 400 and take up the PET film 400. The PET film 400 is discharged by using the film discharging roller 40, and the separated PET film 400 is collected by rotating the film collecting roller 42 matched with the advancing speed of the battery pole piece 120, so that the whole arrangement of the PET film mechanism is flexible and simple, and the technical implementation is convenient.

In order to improve the condition that the drawing-out or drawing-back speed of the PET film 400 is inconsistent with the advancing speed of the battery pole piece 120, a tensioning unit can be arranged on the PET film 400 before the PET film 400 is merged in and/or after the PET film 400 is separated out, and the tensioning unit can tension the passing PET film 400 under a preset force; thereby improving adverse effects on the sudden change in the pulling force of the PET film 400. Specifically, as shown in fig. 1, the tension unit includes two steering rollers 411 for guiding, and a tension roller 412 that can form an elastic tension to the PET film 400; between the turning roll 411 and the tension roll 412, a certain amount of buffering length of the PET film 400 exists, and the elastic force of the tension roll 412 can be flexibly adjusted according to the pulling force of the PET film 400 under the working condition so as to be preset.

As shown in fig. 2, in the present embodiment, the battery lamination apparatus further includes a tension roller 8, a buffer mechanism 801, a secondary drive roller set 802, a turret mechanism 803, a robot 804 and a lamination mechanism 805, which are located downstream of the battery pole piece thermal compound device and arranged in sequence.

The tension roller 8 can adopt a structural form similar to that of the tension roller 412, and the battery pole piece 120 passing through the tension roller 8 can be buffered for a certain length at the buffer mechanism 801 and then enters the turret mechanism 803 through the guidance of the secondary drive roller group 802. The whole process from the pressing and lamination of the pole pieces is completed by the grabbing movement of the manipulator 804 on the turret mechanism 803 and the lamination of the lamination mechanism 805, and finally the lamination stack for packaging into a battery cell is formed. The turret mechanism 803, the manipulator 804 and the lamination mechanism 805 may be implemented by using the existing and well-known technologies, and the detailed structure thereof will not be described in detail.

The battery pole piece heat composite device and the battery lamination equipment thereof in the embodiment adopt the driving unit which rotates and clamps the battery pole piece 120 to drive the battery pole piece 120 to advance, so that the heat sealing mechanism 6 drives the heating belt 600 in the heat sealing mechanism 6 to rotate along with the heat sealing mechanism 6 in the process of passing through the heat sealing mechanism 6, and the heat sealing mechanism 6 completes the heating and pressing of the battery pole piece 120.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a battery pole piece heat set composite for battery pole piece (120) pressfitting as an organic whole that forms with pole piece and diaphragm (201) coincide, its characterized in that includes:

the main driving mechanism (7) is provided with two groups of driving units which are respectively arranged on the upper part and the lower part of the battery pole piece (120) and form clamping on the battery pole piece (120), and the two driving units rotate in different directions to form driving on the battery pole piece (120);

the heat sealing mechanism (6) is arranged at the upstream of the main driving mechanism (7) along the advancing direction of the battery pole piece (120), and is provided with two groups of heating belts (600) which are respectively arranged on the upper part and the lower part of the battery pole piece (120), sleeved on a rotating roller capable of rotating freely and capable of rotating in a reciprocating manner; the two heating belts (600) are provided with heating parts capable of increasing the temperature of the heating belts, and are tightly attached to the battery pole pieces (120) and rotate along with the battery pole pieces (120) so as to form heating and pressing on the battery pole pieces (120).

2. The battery pole piece thermal compounding device of claim 1, wherein: the driving unit comprises a driven roller (701) and a driving roller (702) which are arranged at intervals, and a driving belt (700) sleeved on the driven roller (701) and the driving roller (702), wherein the driving belt (700) rotates in a reciprocating mode along with the rotation of the driving roller (702) so as to drive the battery pole piece (120) to advance.

3. The battery pole piece thermal compounding device of claim 1, wherein: the live rollers are an input end live roller (601) and an output end live roller (602) which are arranged at intervals, and the radial size of the input end live roller (601) which is positioned at the upstream of the advancing direction is smaller than that of the output end live roller (602).

4. The battery pole piece thermal compounding device of claim 1, wherein: the device also comprises two groups of PET film mechanisms which are arranged above and below the battery pole piece (120), wherein each PET film mechanism comprises a film collecting and releasing rotating roller and a PET film (400) arranged on the film collecting and releasing rotating roller; the PET film (400) is led out from the film collecting and releasing roll, is converged at the upstream of the heat sealing mechanism (6), is attached to the upper surface or the lower surface of the battery pole piece (120), is separated from the downstream of the main driving mechanism (7) and is led back to the film collecting and releasing roll.

5. The battery pole piece thermal compounding device of claim 4, wherein: the film collecting and releasing roller comprises a film collecting roller (40) which is wound with the PET film (400) and can rotate freely, and a film collecting roller (42) which can drive to rotate to wind up the PET film (400) and lead the PET film (400) back.

6. The battery pole piece thermal compounding device of claim 5, wherein: a tensioning unit is provided on the PET film (400) before the joining and/or after the separating, said tensioning unit forming a tension to the passing PET film (400) with a predetermined force.

7. The thermal compounding device of a battery pole piece of any one of claims 1-6, wherein: the cutting mechanism (3) is arranged at the upstream of the heat sealing mechanism (6), and the pole piece led out by the pole piece unwinding mechanism (1) and the diaphragm (201) led out by the diaphragm unwinding mechanism (2) are separately gathered into the cutting mechanism (3); a guide roller set and a cutting knife (305) capable of cutting the pole piece with equal length are arranged in the cutting mechanism (3), the guide roller set rotates under the drive of the diaphragm (201) and forms guide for the pole piece at the upstream of the cutting knife (305); the pole piece and the diaphragm (201) passing through the cutting mechanism (3) are superimposed to form the battery pole piece (120).

8. The battery pole piece thermal compounding device of claim 7, wherein: a guide roller (401) which is spaced from the heat sealing mechanism (6) and is used for guiding the battery pole piece (120) is arranged at the upstream of the heat sealing mechanism (6); the battery pole piece thermal compounding device further comprises a CCD detection unit (5) which is arranged between the guide roller (401) and the thermal sealing mechanism (6) and used for detecting the pole pieces cut into sections.

9. The battery pole piece thermal compounding device of claim 8, wherein: in the advancing direction, the length of the part of the main driving mechanism (7) which clamps the battery pole piece (120) is more than three times of the length of the pole piece which is cut into sections; the distance between the guide roll (401) and the heat sealing mechanism (6) is smaller than the length of the pole piece cut into sections in the advancing direction.

10. A battery lamination apparatus for laminating and laminating a pole piece and a separator (201) to a battery pole piece (120), wherein the battery lamination apparatus employs the battery pole piece thermal compound device of any one of claims 1 to 9.