CN217655939U

CN217655939U - Feeding device for lithium battery composite core making and lithium battery composite core making system

Info

Publication number: CN217655939U
Application number: CN202221470495.0U
Authority: CN
Inventors: 秦亚伟; 尚旭; 王义武; 宋文锋
Original assignee: Svolt Energy Technology Wuxi Co Ltd
Current assignee: Svolt Energy Technology Wuxi Co Ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-10-25
Anticipated expiration: 2032-06-13

Abstract

The utility model provides a compound loading attachment and the compound system core system of making of lithium cell for core, the utility model discloses a loading attachment, including parallel pole piece unwinding mechanism and the diaphragm unwinding mechanism of arranging, locate the film-making mechanism in pole piece unwinding mechanism low reaches, locate the electrostatic spinning mechanism in diaphragm unwinding mechanism low reaches to and locate the pole piece feeding mechanism in film-making mechanism and electrostatic spinning mechanism low reaches. The electrostatic spinning mechanism comprises a feeding part for storing glue solution, and a spraying part and an electrode receiving part which are oppositely arranged on the upper side and the lower side of a diaphragm unreeled by the diaphragm unreeling mechanism, wherein the spraying part is connected with the feeding part, is connected with an external power supply and is matched with the electrode receiving part, and the glue solution supplied by the feeding part is sprayed to the diaphragm in a filament shape. The pole piece feeding mechanism is used for placing the pole piece on one side of the diaphragm, wherein the side is provided with glue solution. The utility model discloses a loading attachment can directly bond the pole piece and the diaphragm that unreel together, avoids taking place to remove the dislocation problem.

Description

Feeding device for lithium battery composite core making and lithium battery composite core making system

Technical Field

The utility model relates to a lithium cell production facility technical field, in particular to compound system of lithium cell loading attachment for core. And simultaneously, the utility model discloses still relate to a compound system core system of making of lithium cell with loading attachment is used to compound system core of this lithium cell.

Background

At present, for hard-shell and soft-package lithium ion batteries, the core forming process is mainly divided into two routes of winding and lamination. Compared with a winding battery cell, the laminated battery cell has the advantages that the pole pieces are cut into single pieces to be made into cores, the disadvantage that the energy of active substances on the arc edge is low after the winding battery cell is hot-pressed can be avoided, the battery cell is not easy to deform, and the application range is wider and wider.

The traditional lamination process mainly comprises two types, namely a traditional Z-shaped lamination process and a thermal composite core making process, the core making efficiency of the process is higher than that of the Z-shaped lamination process, and the investment cost of a production line can be effectively reduced. However, the thermal compound process in the prior art also has the problem that the pole pieces are easy to be dislocated in the process of thermally compounding and making the core, and has complex structure and high equipment cost.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a loading attachment is used to compound system core of lithium cell can directly bond the pole piece and the diaphragm that unreel together, and can avoid taking place to remove the dislocation problem.

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

a feeding device for composite core making of a lithium battery comprises a pole piece unwinding mechanism and a diaphragm unwinding mechanism which are arranged in parallel, a pole piece making mechanism arranged at the downstream of the pole piece unwinding mechanism, an electrostatic spinning mechanism arranged at the downstream of the diaphragm unwinding mechanism, and a pole piece feeding mechanism arranged at the downstream of the pole piece making mechanism and the electrostatic spinning mechanism;

the pole piece unreeling mechanism is used for unreeling continuous pole pieces, and the sheet-making mechanism is used for making the unreeled continuous pole pieces into pole pieces with preset sizes;

the electrostatic spinning mechanism comprises a feeding part for storing glue solution, and a spraying part and a receiving electrode part which are oppositely arranged on the upper side and the lower side of a diaphragm unreeled by the diaphragm unreeling mechanism, wherein the spraying part is connected with the feeding part, is connected with an external power supply and is matched with the receiving electrode part, and sprays the glue solution supplied by the feeding part onto the diaphragm in a filament shape;

the pole piece feeding mechanism is used for placing the pole piece on one side of the diaphragm, which is provided with the glue solution.

Further, the receiving electrode part is a receiving electrode roller that is located below the diaphragm and supports the diaphragm.

Furthermore, the feeding part adopts an injector, the injection part is in a needle shape, and the injection part is connected with an injection port of the injector.

Further, a deviation rectifying mechanism is arranged between the pole piece unwinding mechanism and the pole piece manufacturing mechanism; and a deviation rectifying mechanism is arranged between the diaphragm unwinding mechanism and the electrostatic spinning mechanism.

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

lithium cell composite system loading attachment for core, through setting up electrostatic spinning mechanism to steerable glue solution fineness, and can directly bond the pole piece that unreels and diaphragm together, and it is effectual to bond, avoids the pole piece relative diaphragm to take place the dislocation problem before the lamination, simultaneously, still can cancel the use of coating diaphragm in lithium cell manufacture process, saved the cost of manufacture.

In addition, set up receiving electrode roller, can accept and support the diaphragm well, do benefit to and promote the glue solution spraying effect. And the deviation rectifying mechanism is arranged, so that the adjustment of the bonding position of the pole piece and the diaphragm is facilitated, and the bonding quality is ensured.

In addition, after the pole pieces are inserted into the diaphragm adhered with glue solution fibers, the positive pole piece, the negative pole piece and the diaphragm can be directly adhered together through rolling without preheating, compared with a common thermal compound mechanism in the market, the diaphragm has the advantages that the preheating mechanism is omitted, and the process difficulty is reduced.

Another object of the present invention is to provide a lithium battery composite core making system, which includes the above-mentioned feeding device for lithium battery composite core making, and a pressing mechanism and a laminating mechanism arranged in sequence at the downstream of the feeding device; the pressing mechanism comprises two pressing rollers which are arranged up and down so as to roll the pole piece and the diaphragm in a conveyed fit state to form a laminated structure; the lamination mechanism is used for laminating the laminated structure.

Further, the press roll is a hot roll or a cold roll.

Furthermore, the pole piece unreeling mechanism comprises at least one group of positive pole piece unreeling assemblies and negative pole piece unreeling assemblies, wherein the positive pole piece unreeling assemblies and the negative pole piece unreeling assemblies are arranged at intervals;

the diaphragm unwinding mechanisms are respectively in one-to-one correspondence with the positive plate unwinding units and the negative plate unwinding units, and are respectively arranged below the positive plate unwinding units and the negative plate unwinding units;

the pole piece comprises a positive pole piece and a negative pole piece which are manufactured by the pole piece manufacturing mechanism;

the laminated structure is formed by superposing the positive plate, the diaphragm, the negative plate and the diaphragm;

the lamination mechanism comprises a cutting assembly and a lamination assembly which are sequentially arranged at the downstream of the pressing mechanism, the cutting assembly is used for cutting the laminated structure into laminated units with preset sizes, and the lamination assembly is used for stacking the laminated units.

Furthermore, the pole piece unreeling mechanism comprises at least one group of positive and negative pole piece unreeling assemblies, and the positive and negative pole piece unreeling assemblies comprise positive pole piece unreeling units and negative pole piece unreeling units which are arranged at intervals;

the diaphragm unreeling mechanisms are in one-to-one correspondence with the positive and negative pole piece unreeling assemblies and are arranged on the middle layers of the positive pole piece unreeling units and the negative pole piece unreeling units;

the laminated structure is formed by stacking the positive plate, the diaphragm and the negative plate according to different arrangement combinations, and the positive plate and the negative plate are arranged along the length direction of the diaphragm.

Further, the lamination mechanism is a Z-shaped lamination machine and is used for carrying out Z-shaped lamination processing on the laminated structure;

further, the lamination mechanism is a winding lamination machine and is used for winding lamination processing of the laminated structure.

The utility model discloses a compound core system of making of lithium cell is through setting up foretell lithium-ion battery pole piece is compound with loading attachment, can be in the same place the pole piece and the diaphragm that unreel directly bond, and bond effectually, avoid the relative diaphragm of pole piece to take place the dislocation problem before the lamination, simultaneously, still can cancel because of adopting the required mechanism of preheating of coating diaphragm to and the required hot pressing mechanism of design, and then can reduce the equipment use, preferred system architecture saves equipment cost.

Drawings

The accompanying drawings, which form a part of the present disclosure, are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and together with the description serve to explain the present disclosure. In the drawings:

fig. 1 is a schematic view of an overall structure of a feeding device according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of an electrostatic spinning mechanism according to a second embodiment of the present invention;

fig. 3 is a schematic view of an overall structure of a lithium battery composite core manufacturing system according to the second embodiment of the present invention;

fig. 4 is a schematic structural view of a laminated structure of Z-shaped laminates according to a second embodiment of the present invention;

fig. 5 is a schematic structural view of a bare cell after Z-shaped lamination according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a laminated structure when the laminate is wound according to the second embodiment of the present invention;

fig. 7 is a schematic structural view of a winding-type lamination back bare cell according to the second embodiment of the present invention.

Description of reference numerals:

1. a pole piece unwinding mechanism; 101. the positive plate unreeling unit; 1011. a positive plate; 102. the negative plate unreeling unit; 1021. a negative plate;

2. a diaphragm unwinding mechanism; 200. a diaphragm;

3. a sheet making mechanism; 4. an electrostatic spinning mechanism; 401. a feeding section; 402. an injection section; 403. a receiving electrode section; 404. a power source;

5. a pole piece feeding mechanism; 6. a pressing mechanism; 600. pressing rollers;

7. cutting the assembly; 8. a lamellar unit; 9. naked electric core.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", "front", "rear", "left", "right", "top", "bottom" and the like appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in conjunction with the specific situation for a person of ordinary skill in the art.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The utility model relates to a loading attachment is used to compound system core of lithium cell, on overall structure, this loading attachment locates the film-making mechanism 3 in 1 low reaches of pole piece unwinding mechanism including the pole piece unwinding mechanism 1 and the diaphragm unwinding mechanism 2 of arranging in parallel, locates the electrostatic spinning mechanism 4 in 2 low reaches of diaphragm unwinding mechanism to and locate the pole piece feeding mechanism 5 in 3 and the 4 low reaches of electrostatic spinning mechanism of film-making mechanism. The pole piece unreeling mechanism 1 is used for unreeling continuous pole pieces, and the sheet-making mechanism 3 is used for manufacturing the unreeled continuous pole pieces into pole pieces with preset sizes.

The electrostatic spinning mechanism 4 includes a supply unit 401 storing the glue solution, and a spraying unit 402 and a receiving electrode unit 403 which are oppositely arranged on the upper and lower sides of the separator 200 unreeled by the separator unreeling mechanism 2, wherein the spraying unit 402 is connected with the supply unit 401, and the spraying unit 402 is connected with an external power supply 404 and is matched with the receiving electrode unit 403 to spray the glue solution supplied by the supply unit 401 onto the separator 200 in a filament shape. The pole piece feeding mechanism 5 is used for placing the pole piece on one side of the diaphragm 200 with the glue solution.

It should be noted that, in the present embodiment, the pole piece feeding mechanism 5 preferably adopts a conventional clamping and feeding mechanism, such as a clamping mechanism for clamping the pole piece, and a transplanting mechanism for controlling the action of the clamping mechanism. The power supply 404 preferably employs a high voltage power supply 404.

The structural parts not mentioned in the feeding device of this embodiment can refer to the structures of the lithium battery composite lamination device in the prior art, and the glue solution of this embodiment preferably adopts conventional cold glue or thermal gel products, which are not described herein again.

Based on the above overall description, in the present embodiment, as a preferred embodiment, as shown in fig. 1 and fig. 2, the receiving electrode part 403 of the present embodiment is a receiving electrode roller which is located below the diaphragm 200 and supports the diaphragm 200, so as to well receive and support the diaphragm 200, and to be beneficial to improving the glue spraying effect.

Preferably, the supply unit 401 of the present embodiment uses a syringe, the injection unit 402 has a needle shape, and the injection unit 402 is connected to an injection port of the syringe. Of course, the structures of the electrospinning mechanism 4 of this embodiment that are not mentioned can be obtained by referring to the conventional electrospinning device.

In addition, the glue solution sprayed by the electrostatic spinning mechanism 4 is fibrous, and the diaphragm adhered with the glue solution fiber can be directly adhered together by rolling the positive and negative pole pieces and the diaphragm after the pole pieces are inserted, without preheating.

In this embodiment, preferably, a deviation rectifying mechanism is arranged between the pole piece unwinding mechanism 1 and the pole piece manufacturing mechanism 3. Also preferably, a deviation rectifying mechanism is arranged between the membrane unwinding mechanism 2 and the electrostatic spinning mechanism 4. So set up, do benefit to the adjustment to pole piece and diaphragm 200 bonding position, and ensure the bonding quality.

The feeding device for the composite core manufacturing of the lithium battery can control the fineness of the glue solution by arranging the electrostatic spinning mechanism 4, the unreeled pole piece and the diaphragm 200 are directly bonded together, the bonding effect is good, the problem that the pole piece is dislocated relative to the diaphragm when the lamination moves is avoided, meanwhile, the use of coating the diaphragm 200 in the manufacturing process of the lithium battery can be eliminated, and the manufacturing cost is saved.

Example two

The present embodiment relates to a lithium battery composite core making system, as shown in fig. 3, the lithium battery composite system includes the feeding device for lithium battery composite core making as described in the first embodiment, and a pressing mechanism 6 and a lamination mechanism arranged in sequence at the downstream of the feeding device.

The pressing mechanism 6 includes two pressing rollers 600 arranged up and down to roll the conveyed pole piece and the diaphragm 200 in the attached state to form a layered structure. The lamination mechanism is used for laminating a laminated structure formed by laminating the pole piece and the diaphragm 200.

In specific implementation, the pressure roller 600 may be a hot roller or a cold roller, so as to form a pressing fit between the pole piece and the diaphragm 200. Here, when the thermal gel is used, the press roller 600 uses a hot roller, and if the glue solution uses a cold gel, the press roller 600 uses a cold roller.

Preferably, the pole piece unreeling mechanism 1 in this embodiment includes at least one set of positive and negative pole piece unreeling assemblies, and the positive and negative pole piece unreeling assemblies include a positive pole piece unreeling unit 101 and a negative pole piece unreeling unit 102 that are arranged at intervals. The plurality of diaphragm unwinding mechanisms 2 in this embodiment correspond to the positive electrode sheet unwinding units 101 and the negative electrode sheet unwinding units 102 one by one, and the diaphragm unwinding mechanisms 2 are respectively arranged below the positive electrode sheet unwinding units 101 and the negative electrode sheet unwinding units 102.

At this time, the electrode sheet in this embodiment includes the positive electrode sheet 1011 and the negative electrode sheet 1021 produced by the sheet producing mechanism 3, and the layered structure is formed by stacking the positive electrode sheet 1011, the separator 200, the negative electrode sheet 1021, and the separator 200 one on top of the other.

The lamination mechanism in this embodiment includes a cutting assembly 7 and a lamination assembly arranged in sequence downstream of the stitching mechanism 6, the cutting assembly 7 being configured to cut the laminated structure into laminated units 8 of a predetermined size, and the lamination assembly being configured to stack the laminated units 8.

Of course, in addition to the lamination form in the present embodiment, a conventional lamination form such as a Z-type lamination form and a winding lamination form may be employed. At this time, preferably, the pole piece unwinding mechanism 1 includes at least one set of positive and negative pole piece unwinding assemblies, and the positive and negative pole piece unwinding assemblies include a positive pole piece unwinding unit 101 and a negative pole piece unwinding unit 102 which are arranged vertically.

Meanwhile, the diaphragm unwinding mechanisms 2 are a plurality of one-to-one correspondence to the positive and negative pole piece unwinding assemblies, and are arranged in the middle layer of each positive pole piece unwinding unit 101 and each negative pole piece unwinding unit 102. And the pole piece comprises a positive pole piece 1011 and a negative pole piece 1021 made by the sheet making mechanism 3. The layered structure (continuous without cutting) is formed by stacking the positive electrode sheet 1011, the separator 200 and the negative electrode sheet 1021 according to different arrangements, and the positive electrode sheet 1011 and the negative electrode sheet 1021 are arranged along the length direction of the separator 200.

If a Z-type lamination form is adopted, the lamination mechanism is a Z-type lamination machine, and is used for performing Z-type lamination processing on the laminated structure, and at this time, as shown in fig. 4, the positive electrode sheet 1011 and the negative electrode sheet 1021 in the laminated structure are arranged in a staggered manner on the upper side and the lower side of the separator 200, and are stacked via the lamination mechanism into the bare cell 9 shown in fig. 5.

If the winding lamination form is adopted, the lamination mechanism is a winding lamination machine and is used for winding and laminating the laminated structure. At this time, as shown in fig. 6, in the above-described layered structure, the positive electrode sheets 1011 are sequentially arranged between two separators 200 arranged in parallel (the two separators 200 are preferably configured by bending one continuous separator 200), the negative electrode sheets 1021 are arranged on the upper and lower sides of the two separators corresponding to the positive electrode sheets 1011, and the negative electrode sheets 1021 are arranged in a staggered manner and stacked via the winding mechanism into the bare cell 9 shown in fig. 7.

The pressing mechanism 6, the cutting assembly 7, the lamination assembly, the Z-type lamination machine, the winding lamination machine, and the like, which are not mentioned in this embodiment, can refer to related equipment products common in the art, and are not described herein again. It should be mentioned that, the positive plate unreeling unit 101, the negative plate unreeling unit 102 and the membrane unreeling mechanism 2 include, but are not limited to, the number setting and arrangement form, and corresponding setting and adjustment can be performed according to actual production operation requirements, for reducing the number of times of stacking, the positive plate unreeling unit 101 and the negative plate unreeling unit 102 can be set to be multiple, and at this time, it is only necessary to ensure that the corresponding membrane unreeling mechanisms 2 are respectively arranged corresponding to the positive plate unreeling units 101 and the negative plate unreeling units 102, so as to improve the core making efficiency.

The composite core system of lithium battery of this embodiment is through setting up the composite core of lithium battery loading attachment for core of embodiment one, can be in the same place the pole piece and the diaphragm 200 that unreel are direct to bond, and it is effectual to bond, avoid moving the relative diaphragm 200 of in-process pole piece and take place the dislocation problem, simultaneously, still can cancel because of adopting the required mechanism of preheating of coating diaphragm 200 to and the required hot pressing mechanism of design, and then can reduce the equipment use, preferred system architecture, save equipment cost.

The above description is only for the 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 loading attachment is used to compound system core of lithium cell which characterized in that:

the feeding device comprises a pole piece unwinding mechanism (1) and a diaphragm unwinding mechanism (2) which are arranged in parallel, a sheet making mechanism (3) arranged at the downstream of the pole piece unwinding mechanism (1), an electrostatic spinning mechanism (4) arranged at the downstream of the diaphragm unwinding mechanism (2), and a pole piece feeding mechanism (5) arranged at the downstream of the sheet making mechanism (3) and the electrostatic spinning mechanism (4);

the pole piece unreeling mechanism (1) is used for unreeling continuous pole pieces, and the pole piece producing mechanism (3) is used for manufacturing the unreeled continuous pole pieces into pole pieces with preset sizes;

the electrostatic spinning mechanism (4) comprises a feeding part (401) storing glue solution, and a spraying part (402) and a receiving electrode part (403) which are oppositely arranged at the upper side and the lower side of a diaphragm (200) unreeled by the diaphragm unreeling mechanism (2), wherein the spraying part (402) is connected with the feeding part (401), the spraying part (402) is connected with an external power supply (404) and matched with the receiving electrode part (403), and the glue solution supplied by the feeding part (401) is sprayed onto the diaphragm (200) in a filament shape;

the pole piece feeding mechanism (5) is used for placing the pole piece on one side of the diaphragm (200) with the glue solution.

2. The feeding device for the composite core of the lithium battery as claimed in claim 1, wherein:

the receiving electrode part (403) is a receiving electrode roller that is located below the separator (200) and supports the separator (200).

3. The feeding device for the composite core of the lithium battery as claimed in claim 1, wherein:

the feeding part (401) adopts a syringe, the spraying part (402) is in a needle shape, and the spraying part (402) is connected with an injection port of the syringe.

4. The feeding device for the composite core making of the lithium battery as claimed in claim 1, wherein:

a deviation rectifying mechanism is arranged between the pole piece unreeling mechanism (1) and the pole piece making mechanism (3); and a deviation rectifying mechanism is arranged between the diaphragm unreeling mechanism (2) and the electrostatic spinning mechanism (4).

5. The utility model provides a lithium cell composite core system which characterized in that:

the lithium battery composite core-making feeding device comprises the lithium battery composite core-making feeding device as claimed in any one of claims 1 to 4, and a pressing mechanism (6) and a laminating mechanism which are arranged in sequence and are arranged at the downstream of the feeding device;

the pressing mechanism (6) comprises two pressing rollers (600) which are arranged up and down so as to press the pole piece and the diaphragm (200) in a conveyed attaching state to form a laminated structure;

the lamination mechanism is used for laminating the laminated structure.

6. The lithium battery composite coremaking system according to claim 5, wherein:

the press roll (600) is a hot roll or a cold roll.

7. The lithium battery composite coremaking system according to claim 5, wherein:

the pole piece unreeling mechanism (1) comprises at least one group of positive and negative pole piece unreeling assemblies, and the positive and negative pole piece unreeling assemblies comprise positive pole piece unreeling units (101) and negative pole piece unreeling units (102) which are arranged at intervals;

the membrane unreeling mechanisms (2) are respectively in one-to-one correspondence with the positive electrode piece unreeling units (101) and the negative electrode piece unreeling units (102), and the membrane unreeling mechanisms (2) are respectively arranged below the positive electrode piece unreeling units (101) and the negative electrode piece unreeling units (102);

the pole piece comprises a positive pole piece (1011) and a negative pole piece (1021) which are manufactured by the pole piece manufacturing mechanism (3);

the laminated structure is formed by superposing the positive electrode sheet (1011), the diaphragm (200), the negative electrode sheet (1021) and the diaphragm (200);

the lamination mechanism comprises a cutting assembly (7) and a lamination assembly which are sequentially arranged at the downstream of the pressing mechanism (6), wherein the cutting assembly (7) is used for cutting the laminated structure into laminated units (8) with preset sizes, and the lamination assembly is used for stacking the laminated units (8).

8. The lithium battery composite coremaking system according to claim 5, wherein:

the membrane unreeling mechanisms (2) are in one-to-one correspondence with the positive and negative pole piece unreeling assemblies and are arranged in the middle layers of the positive pole piece unreeling units (101) and the negative pole piece unreeling units (102);

the laminated structure is formed by stacking the positive electrode sheet (1011), the diaphragm (200) and the negative electrode sheet (1021) according to different arrangements, and the positive electrode sheet (1011) and the negative electrode sheet (1021) are arranged along the length direction of the diaphragm (200).

9. The lithium battery composite coremaking system of claim 8, wherein:

the lamination mechanism is a Z-shaped lamination machine and is used for carrying out Z-shaped lamination processing on the laminated structure.

10. The lithium battery composite coremaking system of claim 8, wherein:

the lamination mechanism is a winding lamination machine and is used for winding and laminating the laminated structure.