CN217522093U - Electrode assembly preparation device - Google Patents

Abstract

The utility model provides an electrode assembly spare preparation facilities, it is including the diaphragm conveying mechanism who is used for carrying the diaphragm, and arranges diaphragm conveying mechanism low reaches pole piece conveying mechanism, pole piece conveying mechanism carries positive plate and negative pole piece respectively to arrive on the relative face of diaphragm, positive plate, diaphragm and negative pole piece form the stack, wherein, electrode assembly spare preparation facilities still includes guiding mechanism, guiding mechanism follows the direction of gravity of stack is arranged pole piece conveying mechanism's low reaches, and the guide the direction of conveyance of stack makes two adjacent stacks and connects the diaphragm of two adjacent stacks becomes the zigzag and carries.

Description

Electrode assembly preparation device

Technical Field

The utility model relates to a battery equipment technical field, concretely relates to electrode assembly spare preparation facilities.

Background

A secondary battery, as an energy storage device, is mainly composed of a positive electrode, a negative electrode, a separator, and an electrolyte. Among them, the electrode assembly may be classified into a winding type and a lamination type according to the structure of the cathode/separator/anode. The winding type electrode assembly part is simple in manufacturing process and high in production efficiency, but the curvature radius of the obtained pole piece is not uniform, so that the reaction degree and the reaction rate of the surface of the pole piece are not uniform in the charging and discharging process, and lithium precipitation of the pole piece can be caused. The laminated electrode assembly has the advantages of uniform internal structure, good surface reaction consistency of the pole piece, difficult deformation and suitability for high-energy density electrode assemblies. However, the laminated structure has a complex manufacturing process and low production efficiency.

The common manufacturing mode of the lamination type structure is that the lamination is carried out by moving the lamination table back and forth, the left and right sheet taking mechanical arm mechanisms of the lamination equipment pick up the pole pieces in the positive and negative material tanks, and the materials are alternately discharged on the lamination table after secondary positioning and workbench positioning. At the moment, the lamination table moves left and right between the two mechanical arms to match the actions of the mechanical arms, the negative electrode is moved to the positive electrode for lamination after being laminated, and the diaphragm forms a Z shape to separate the positive and negative electrode plates. In such lamination equipment, the cyclic reciprocating action of the lamination station generates a large inertia and no tension between the pole pieces and the diaphragm.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a technical problem that an aspect will be solved is how to overcome the shortcoming that traditional electrode assembly spare lamination equipment when operation inertia is great, the easy dislocation of positive and negative pole piece of the electrode assembly spare of assembling into.

Furthermore, other aspects of the present invention are also directed to solving or alleviating other technical problems in the prior art.

The utility model provides an electrode assembly spare preparation facilities particularly, according to the utility model discloses an aspect provides:

an electrode assembly preparation apparatus comprising

A membrane conveying mechanism for conveying the membrane, and

a pole piece conveying mechanism arranged at the downstream of the diaphragm conveying mechanism, wherein the pole piece conveying mechanism respectively conveys a positive pole piece and a negative pole piece to opposite surfaces of the diaphragm, and the positive pole piece, the diaphragm and the negative pole piece form a laminated body,

wherein the electrode assembly manufacturing apparatus further comprises a guide mechanism that is disposed downstream of the pole piece conveying mechanism in a gravity direction of the laminated bodies and guides a conveying direction of the laminated bodies so that adjacent two laminated bodies and a separator connecting the adjacent two laminated bodies are conveyed in a zigzag shape.

Optionally, according to an embodiment of the present invention, the guiding mechanism comprises a plurality of rollers, adjacent two rollers are spaced apart in a direction perpendicular to a direction of gravity of the stack, and a distance between adjacent two rollers is a length of a single stack in a conveying direction thereof.

Optionally, according to the utility model discloses an embodiment, the diaphragm conveying mechanism includes the diaphragm unreeling roller and the dancer roll that follow diaphragm direction of delivery in proper order and arrange, the dancer roll quantity is a plurality of to all dancer rolls do not arrange on same straight line.

Optionally, according to an embodiment of the present invention, the diaphragm conveying mechanism further includes a guide roller, the guide roller is arranged in a downstream of the tension adjusting roller along a conveying direction of the diaphragm, and guides the diaphragm to convey along a gravity direction of the diaphragm.

Optionally, according to an embodiment of the present invention, the pole piece conveying mechanism is configured to arrange the positive plate conveyor belt and the negative plate conveyor belt and guide on the two sides of the diaphragm conveying line respectively, the positive plate pressing roller and the guide of the positive plate conveyor belt the negative plate pressing roller of the negative plate conveyor belt, the positive plate and the negative plate are conveyed on the conveyor belt at equal intervals from each other, the positive plate pressing roller presses the positive plate onto the diaphragm, and the negative plate pressing roller presses the negative plate onto the diaphragm.

Optionally, according to an embodiment of the present invention, the diaphragm conveying mechanism and the pole piece conveying mechanism are provided with a heating mechanism therebetween, and the pole piece conveying mechanism and the guiding mechanism are provided with a cooling mechanism therebetween.

Optionally, according to an embodiment of the present invention, a clamping mechanism is disposed between the cooling mechanism and the guiding mechanism, and the positive plate and the negative plate are clamped by the clamping mechanism with the diaphragm.

Alternatively, according to an embodiment of the invention, the clamping mechanism is configured as two clamping rollers rotating in opposite directions, the stack passing between the two clamping rollers.

Optionally, according to an embodiment of the present invention, the electrode assembly preparation apparatus further includes a winding mechanism disposed downstream of the guide mechanism, the winding mechanism including a gripper that grips and rotates a stack formed by a plurality of the stacks so that a separator is wound outside the stack.

Optionally, according to an embodiment of the present invention, the electrode assembly preparation apparatus further comprises a cutting mechanism arranged between the guiding mechanism and the winding mechanism, the cutting mechanism cutting the membrane after the winding mechanism rotates the stacked body.

The utility model discloses an useful part includes: the positive and negative pole pieces can be firmly bonded on the diaphragm to form a laminated body by heating the diaphragm coated with the hot melt adhesive; the positive and negative pole pieces are respectively conveyed to the diaphragm through the conveying mechanism, the process is simple, the efficiency is high, and the operation of a mechanical arm is omitted; the plurality of stacked bodies are guided by the guide mechanism and conveyed in a Z shape, so that the stacked bodies can be stacked by the gravity of the stacked bodies, and the inertia caused by the reciprocating motion of the stacking table is reduced.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

fig. 1 shows a schematic structural view of an electrode assembly manufacturing apparatus according to an embodiment of the present invention;

fig. 2 shows a schematic position diagram of a stack and a separator when stacked, in operation of an electrode assembly manufacturing apparatus according to an embodiment of the present invention;

fig. 3 shows a schematic structural view of an electrode assembly obtained by an electrode assembly manufacturing apparatus according to an embodiment of the present invention.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a person skilled in the art can propose various alternative structural modes and implementation modes without changing the essential spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like, are used for descriptive and distinguishing purposes only and are not to be construed as indicating or implying relative importance of the respective components.

Referring to fig. 1, a schematic structural view of an electrode assembly manufacturing apparatus according to an embodiment of the present invention is shown. The electrode assembly preparation device 100 comprises a diaphragm conveying mechanism 1, a heating mechanism 2, a pole piece conveying mechanism 3, a cooling mechanism 4, a clamping mechanism 5, a guide mechanism 6, a cutting mechanism 7 and a winding mechanism 8. For convenience of description, a direction from the heating mechanism 2 to the guide mechanism 6 in the conveying direction of the separator 10 is defined herein as a vertical direction from top to bottom, and since the separator 10 is conveyed into the guide mechanism 6 in its gravitational direction and is finally stacked by its own weight, this direction is also equivalent to the gravitational direction of the separator 10.

The diaphragm conveying mechanism 1 includes a diaphragm unwinding roller 11, a dancer roller 12, and a guide roller 13 arranged in this order in the diaphragm conveying direction. The separator 10 is first wound on the separator unwinding roller 11 and unwound as the separator unwinding roller 11 rotates. The membrane 10 is removed from the membrane unwinding roller 11 and is first conveyed in a horizontal direction, i.e. perpendicular to the direction of gravity of the membrane 10. Downstream of the membrane unwinding roller 11, a dancer roller 12 is arranged for increasing the surface tension of the membrane 10, facilitating the subsequent adhesion of the pole pieces 20, 30 to the membrane 10. In the embodiment of fig. 1, the number of the dancer rollers 12 is three, the first dancer roller 121 and the second dancer roller 122 are arranged in the direction in which the diaphragm 10 is conveyed out from the diaphragm unwinding roller 11, and the third dancer roller 123 is arranged in the conveying direction between the first dancer roller 121 and the second dancer roller 122 and is spaced apart from these two rollers in the vertical direction so as to apply tension to the diaphragm 10. The tension applied to the diaphragm 10 may be adjusted by adjusting the distance of the third tension adjusting roller 123 from the first tension adjusting roller 121 or the second tension adjusting roller 122 in the vertical direction. The guide roller 13 is disposed downstream of the dancer roller 12 for changing the conveying direction of the separator 10 from the horizontal direction to the vertical direction, in order to subsequently attach the positive and negative electrode sheets 20, 30 to the separator 10 and guide and stack the separator 10. The utility model discloses in diaphragm that uses be the diaphragm 10 that scribbles the hot melt adhesive on the surface to later with positive negative pole piece 20, 30 through the hot melt adhesive bond to diaphragm 10 on two relative surfaces. It should be understood that the diaphragm feed mechanism 1 can also comprise a different number of dancer rollers 12 and guide rollers 13, the relative positions of which can also be varied accordingly.

A heating mechanism 2 is disposed downstream of the guide roller 13, and the heating mechanism 2 heats the separator 10, thereby melting the hot melt adhesive coated on both surfaces of the separator 10 to have good adhesion properties. The heating mechanism 2 may be a heating wire or a laser heating mechanism.

Downstream of the heating mechanism 2, at both sides of the separator 10, there are arranged pole piece conveying mechanisms 3 for conveying the positive pole piece 20 and the negative pole piece 30. In the embodiment of fig. 1, the pole piece conveying mechanism 3 is configured as conveyor belts 31, 32, and the conveyor belts conveying the positive pole piece 20 and the negative pole piece 30 are referred to herein as a positive pole piece conveyor belt 31 and a negative pole piece conveyor belt 32, respectively. The positive electrode sheets 20 are conveyed on the positive electrode sheet conveyor belt 31 and the negative electrode sheets 30 are conveyed on the negative electrode sheet conveyor belt 32 at even intervals from each other in the conveying direction of the conveyor belts, which enables the positive electrode sheets 20 and the negative electrode sheets 30 to be finally bonded to the separator 10 at the same intervals in the conveying direction of the separator 10, so as to facilitate the subsequent arrangement of the guide mechanism 6 and the stacking of the stacked body 200 formed by the positive electrode sheets 20, the separator 10, and the negative electrode sheets 30. This spacing is such that a section is left on the separator 10 where the pole pieces 20, 30 are not adhered, the length of which section should be equal to or greater than the maximum length of the lengths of the positive and negative pole pieces 20, 30 in the conveying direction of the separator 10, preferably equal to the maximum length of the lengths of the positive and negative pole pieces 20, 30 in the conveying direction of the separator 10. In this way, when the stacked body 200 is stacked later, the separator 10 capable of covering the negative electrode sheet 30 or the positive electrode sheet 20 may be present between the negative electrode sheet 30 and the positive electrode sheet 20 of another stacked body to insulate between the individual stacked bodies 200. That is, the portions of the separator 10 where the pole pieces 20 and 30 are not bonded function as insulation between the stacked bodies. The positive electrode sheet conveyor belt 31 has a positive electrode sheet pressing roller 33 that guides the conveyor belt, and the negative electrode sheet conveyor belt 32 has a negative electrode sheet pressing roller 34 that guides the conveyor belt, the positive electrode sheet pressing roller 33 and the negative electrode sheet pressing roller 34 being disposed on both sides of the separator 10, the separator 10 being conveyed from between the positive electrode sheet pressing roller 33 and the negative electrode sheet pressing roller 34. The spacing between the positive electrode sheet pressing roller 33 and the negative electrode sheet pressing roller 34 is larger than the thickness of the separator 10, but smaller than the total thickness of the laminated body 200 formed by the positive electrode sheet 20, the separator 10, and the negative electrode sheet 30, so that when the positive electrode sheet 20 and the negative electrode sheet 30 are conveyed to the separator 10 by the conveyor belts, the positive and negative electrode sheets 20, 30 and the separator 10 can be pressed together by the positive electrode sheet pressing roller 33 and the negative electrode sheet pressing roller 34, causing the positive and negative electrode sheets 20, 30 to adhere to the two opposing surfaces of the separator 10 by the heated hot melt adhesive. In addition, the positive electrode tab conveyor belt 31 and the negative electrode tab conveyor belt 32 are arranged at the same height in the vertical direction, and the position of the positive electrode tab 20 on the positive electrode tab conveyor belt 31 corresponds to the position of the negative electrode tab 30 on the negative electrode tab conveyor belt 32 one by one, so that when the positive electrode tab 20 and the negative electrode tab 30 are bonded to the separator 10, the positive electrode tab 20 and the negative electrode tab 30 can be just opposed in the horizontal direction, forming a stacked body 200 with the positive electrode tab 20 and the negative electrode tab 30 opposed on the left and right sides and the separator 10 in the middle. It should be understood that the pole piece transport mechanism 3 can also be configured in other ways, for example by a robot or the like.

The cooling mechanism 4 is arranged at the downstream of the pole piece conveying mechanism 3, after the diaphragm 10 passes through the pole piece conveying mechanism 3, the positive pole piece 20 and the negative pole piece 30 are bonded on the diaphragm 10, and at the moment, the laminated body 200 is cooled through the cooling mechanism 4, so that the hot melt adhesive is rapidly cooled, and the bonding of the positive pole piece 20 and the negative pole piece 30 is firmer. The cooling mechanism 4 is configured, for example, as a cooling mechanism using air cooling or water cooling, or the like.

Downstream of the cooling mechanism 4, a clamping mechanism 5 is arranged, which clamping mechanism 5 is configured in the embodiment of fig. 1 as two clamping rollers, which are arranged on both sides of the membrane 10 in the horizontal direction, respectively, and whose directions of rotation are opposite to each other. Between the two clamping rollers there remains a gap through which the membrane 10 passes. The width of the gap is larger than the thickness of the separator 10 but smaller than the thickness of the laminated body 200 so as to clamp the positive and negative electrode sheets 20, 30 with the separator 10, thereby increasing the strength of adhesion.

Downstream of the clamping mechanism 5, a guide mechanism 6 is arranged, and in the embodiment of fig. 1, the guide mechanism 6 is provided to include a plurality of rollers, and these rollers are arranged so that the adjacent two laminated bodies and the separator 10 connected therebetween are conveyed in a zigzag shape. Referring to fig. 2, there is shown a schematic view of the position of a stack 200 and a separator 10 when stacked, in operation of an electrode assembly manufacturing apparatus according to an embodiment of the present invention. That is, the adjacent two laminated bodies 200 constitute upper and lower sides of the zigzag, respectively, and a side connecting the middle of the upper and lower sides of the zigzag is formed only by the separator 10. In the embodiment of fig. 1, the guide mechanism includes 4 rollers spaced apart in the gravitational direction of the stacked body 200, wherein the first roller and the fourth roller are disposed in the conveying direction of the separator 10 as it is output from the clamping mechanism 5, and the second roller and the third roller are spaced apart from the first roller and the fourth roller in the horizontal direction. The distance between the adjacent two rollers is the same, and the distance is equal to the length of the stacked body 200 in the diaphragm conveying direction. In this way, the transport path between the four rollers is formed in a zigzag shape, and the diaphragms passing through the four rollers and the laminated body path can be just formed in a zigzag shape in which the upper and lower sides are laminated bodies and the sides connected at the middle are laminated bodies. The laminated body 200 and the separator 10 are changed in their conveying direction while passing through the guide mechanism 6, guided by the guide mechanism 6 to form a zigzag shape, and finally stacked on a horizontal plane. As can be seen from fig. 2, the first stack falls horizontally on a horizontal plane as the lowermost side of the zigzag, the middle side of the zigzag, i.e. the separator 10, falls on the uppermost electrode of this stack due to gravity, and subsequently the second stack falls with its lowermost pole piece on the separator 10. This results in a stack of stacked bodies, separators, and stacked bodies, and the positional relationship of the positive and negative electrodes is the same for each stacked body 200, and for example, in fig. 2, each stacked body 200 has the negative electrode on the top and the positive electrode on the bottom. It should be understood that the guide 6 may also have more than 4 rollers, and that the positions of the rollers may also be arranged differently than in fig. 1, as long as the transport path between each 4 rollers can form a zigzag.

Downstream of the guide mechanism 6, a winding mechanism 8 is arranged, the winding mechanism 8 being configured as an automated mechanism with grippers, by means of which the winding mechanism 8 grips the stack 200 when it is stacked to a certain number, i.e. when a stack comprising a certain number of stacks 200 is formed, and brings it to rotate by a predetermined angle, for example 360 degrees, so that the membrane 10 is completely wound outside the pole pieces 20, 30. Thereby completely isolating electrode assembly 100 from the outside with separator 10.

A cutting mechanism 7 is arranged between the guide mechanism 6 and the winding mechanism 8. After the winding mechanism 8 completes the rotation of the stacked body. The cutting mechanism 7 cuts the separator 10, thereby obtaining the electrode assembly 300.

After cutting the separator 10, the separator 10 needs to be fixed to the outer surface of the electrode assembly 300 with an adhesive tape or glue 400. Referring to fig. 3, there is shown a schematic structural view of an electrode assembly finally obtained by the electrode assembly preparation apparatus according to an embodiment of the present invention.

It should be understood that all the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above may be made by those skilled in the art without departing from the spirit of the invention.

Claims (10)

1. An electrode assembly preparation device, comprising

A membrane conveying mechanism for conveying the membrane, and

a pole piece conveying mechanism arranged at the downstream of the diaphragm conveying mechanism, wherein the pole piece conveying mechanism respectively conveys a positive pole piece and a negative pole piece to opposite surfaces of the diaphragm, and the positive pole piece, the diaphragm and the negative pole piece form a laminated body,

characterized in that the electrode assembly manufacturing apparatus further comprises a guide mechanism which is disposed downstream of the pole piece conveying mechanism in the direction of gravity of the laminated bodies and guides the conveying direction of the laminated bodies so that adjacent two laminated bodies and a separator connecting the adjacent two laminated bodies are conveyed in a zigzag shape.

2. An electrode assembly preparation apparatus according to claim 1, wherein the guide mechanism comprises a plurality of rollers spaced apart along the direction of gravity of the stack, two adjacent rollers being spaced apart along a direction perpendicular to the direction of gravity of the stack, and the distance between two adjacent rollers being the length of a single stack along its transport direction.

3. An electrode assembly manufacturing apparatus according to claim 1 or 2, wherein the membrane conveying mechanism includes a membrane unwinding roller and a dancer roller which are arranged in this order in a membrane conveying direction, the dancer roller is plural in number, and all the dancer rollers are not arranged on the same line.

4. The electrode assembly manufacturing apparatus according to claim 3, wherein the separator conveying mechanism further includes a guide roller that is arranged downstream of the tension adjusting roller in a conveying direction of the separator and guides the separator to be conveyed in a gravity direction of the separator.

5. An electrode assembly preparation apparatus according to claim 1 or 2, wherein the pole piece conveying mechanism is configured as a positive pole piece conveyor belt and a negative pole piece conveyor belt arranged on both sides of the separator conveying line, respectively, on which the positive pole piece and the negative pole piece are conveyed at even intervals from each other, and a positive pole piece pressing roller guiding the positive pole piece conveyor belt and a negative pole piece pressing roller guiding the negative pole piece conveyor belt, which press the positive pole piece onto the separator, respectively.

6. An electrode assembly preparation device according to claim 1 or 2, wherein a heating mechanism is arranged between the membrane transport mechanism and the pole piece transport mechanism, and a cooling mechanism is arranged between the pole piece transport mechanism and the guiding mechanism.

7. An electrode assembly manufacturing apparatus according to claim 6, wherein a clamping mechanism that clamps the positive electrode sheet and the negative electrode sheet with the separator is provided between the cooling mechanism and the guide mechanism.

8. An electrode assembly preparation apparatus according to claim 7, wherein the clamping mechanism is configured as two pinch rollers rotating in opposite directions, the stack passing between the two pinch rollers.

9. An electrode assembly preparation device according to claim 1 or 2, further comprising a winding mechanism arranged downstream of the guide mechanism, the winding mechanism comprising a gripper that grips and rotates a stack formed by a plurality of the laminates such that a separator is wound outside the stack.

10. An electrode assembly preparation device according to claim 9, further comprising a cutting mechanism arranged between the guiding mechanism and the winding mechanism, the cutting mechanism cutting the separator after the winding mechanism rotates the stack.

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