CN218939728U

CN218939728U - Pole piece, battery cell, electric equipment and pole piece processing equipment

Info

Publication number: CN218939728U
Application number: CN202320044190.1U
Authority: CN
Inventors: 吴凯; 卢梦迪; 瞿飞
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-04-28
Anticipated expiration: 2033-01-09

Abstract

The utility model discloses a pole piece, an electric core, a battery cell, electric equipment and pole piece processing equipment, wherein the pole piece comprises a current collector, a film layer, an insulating layer and an isolating layer, and the current collector is provided with a first surface; the film layer is arranged on the first surface of the current collector; the insulating layer is arranged on the first surface of the current collector, is arranged between the insulating layer and the film layer, and is provided with an isolation region; the isolation layer is arranged on the first surface of the current collector, and the isolation layer is arranged in the isolation region. The membrane layer and the insulating layer in this example are separated each other through the isolation region for the edge of membrane layer is clear, and then helps discernment and the snatch of pole piece, realizes the quality control of electric core.

Description

Pole piece, battery cell, electric equipment and pole piece processing equipment

Technical Field

The utility model relates to the field of batteries, in particular to a pole piece, an electric core, a battery cell, electric equipment and pole piece processing equipment.

Background

The battery core of the battery comprises a positive pole piece, a negative pole piece and a separator arranged between the positive pole piece and the negative pole piece. The pole piece comprises a current collector and a film layer made of active materials arranged on the current collector. Because operations such as identifying and positioning are needed to be performed on the pole piece in the processing process of the battery cell, in some cases, the position of the active material film layer is unclear, so that the identification and the grabbing are difficult easily, and the quality control of the battery cell is affected.

Disclosure of Invention

The utility model mainly aims to provide a pole piece, and aims to solve the problem of difficult identification and positioning caused by unclear positions of active material film layers of the existing pole piece.

In order to achieve the above object, the pole piece according to the present utility model includes:

a current collector having a first surface;

the film layer is arranged on the first surface of the current collector;

the insulating layer is arranged on the first surface of the current collector, is arranged between the insulating layer and the film layer, and is provided with an isolation region;

and the isolation layer is arranged on the first surface of the current collector, and the isolation layer is arranged in the isolation region.

The film layer and the insulating layer in the example are mutually separated through the isolation area, so that the edges of the film layer are clear, the identification and the positioning of the pole pieces are facilitated, and the quality control of the battery cell is realized. The isolation layer in this example is as the isolation piece between rete and the insulating layer, blocks the insulating layer through the isolation layer simultaneously, prevents the insulating layer and the marginal mutual infiltration of rete and the problem that the rete edge is fuzzy that leads to in the rete drying process.

In some examples, the barrier layer is a fluororesin material.

By adopting the fluorine-containing resin as the isolation layer in this example, the incompatibility of the fluorine-containing resin with the film layer and the insulating layer can be utilized to prevent the fluorine-containing resin from infiltrating with the film layer or the insulating layer.

In some examples, the isolation layer is any one of teflon, perfluoroethylene propylene copolymer, soluble polytetrafluoroethylene, or ethylene-tetrafluoroethylene copolymer.

The isolation layer is made through selecting any one of the materials in this example, can effectively guarantee the insulating nature of isolation layer, avoids the isolation layer to react with the electrolyte in the battery monomer simultaneously, and then helps promoting the single security of battery.

In some examples, the spacer layer has a width from the film layer toward the insulating layer of no less than 0.8mm and no more than 1.5mm.

Through the width that prescribes a limit to the isolation layer in this example, when realizing the mutual isolation of insulating layer and rete, can conveniently control the area of rete, and then promotes the free capacity of battery.

In some examples, the direction from the film layer to the insulating layer is a first direction, the current collector having a first side in the first direction;

the insulating layer extends to the first side of the current collector and is arranged, and the film layer is arranged on one side, away from the first side of the current collector, of the insulating layer.

In this example, the insulating layer is extended to the first side of the current collector, so that the problem of lithium precipitation caused by burrs of the current collector can be prevented when the processes such as cutting the pole piece are performed.

In some examples, the pole piece further comprises:

the electrode lug is connected with the first side edge of the current collector; and

an insulating extension layer partially covering the tab; the insulating extension layer is disposed adjacent to the current collector and is connected to the insulating layer.

Through adopting insulating extension layer to cover the utmost point ear to be connected insulating extension layer and insulating layer, prevent that the position that the utmost point ear is close to the first side of electric current collector from producing the processing defect, and then can promote the free security performance of battery.

In some examples, the insulating extension layer is disposed at an end of the tab adjacent to the current collector, and a width of the insulating extension layer is not less than 1/3 of a width of the tab along the first direction.

The insulating extension layer in this example can play the effect that prevents that the one end that the utmost point ear is close to the current collector from producing the defect, simultaneously, through making the width of insulating extension layer be not less than 1/3 of the width of utmost point ear, makes insulating extension layer play the supporting effect to the utmost point ear, prevents that the utmost point ear from producing the deformation.

The utility model further provides an example of an electric core based on the pole piece, and the example comprises the pole piece in any example.

The battery cell in the example is provided with the pole piece, and the isolation area is arranged, so that the accuracy of identifying and positioning the pole piece is relatively improved, and then the flaws of the pole piece are reduced, thereby being beneficial to improving the quality of the battery cell.

The utility model further provides an example of a battery cell on the basis of the battery cell, wherein the battery cell comprises the battery cell.

In the example, the battery cell is manufactured by adopting the battery cell, and the safety performance of the battery cell is effectively improved by improving the identification and grabbing accuracy of the pole piece of the battery cell.

In some examples, the battery cell is a lithium iron phosphorus battery.

The utility model further provides an example of electric equipment based on the battery monomer, wherein the electric equipment comprises the battery monomer.

The utility model also discloses an example of pole piece processing equipment based on the pole piece, the pole piece processing equipment is used for processing the pole piece according to any example, and the pole piece processing equipment comprises:

a carrier for carrying the current collector;

a first slurry delivery device disposed adjacent to the carrier, the first slurry delivery device for outputting a slurry forming the film layer to the current collector;

a second paste conveyance device disposed adjacent to the carrier, the second paste conveyance device configured to output paste forming the insulating layer to the current collector; and

and a third slurry delivery device disposed adjacent to the carrier, the third slurry delivery device configured to deliver slurry forming the separator layer to the current collector.

In this example, the slurry output by the first slurry conveying device forms a film layer, the slurry output by the second slurry conveying device forms an insulating layer, and the slurry output by the third slurry conveying device forms an isolating layer, so that a corresponding layered structure is formed on the current collector, and the pole piece is formed by processing.

In some examples, the third slurry conveying device is disposed between the first slurry conveying device and the carrier.

In this example, the slurry output by the third slurry conveying device forms the isolation layer, so that the slurry required by the isolation layer can be first solidified and formed, and then the slurry required by the film layer and the insulating layer is output.

In some examples, the distance between the third slurry conveying device and the first slurry conveying device is no less than 30cm and no more than 50cm.

By defining the distance between the discharge port of the third slurry transporting device and the first slurry transporting device in this example, the spacer layer slurry can have enough setting time, while preventing the problem of the volume of the whole apparatus being excessively large due to the excessively large distance therebetween.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of an exemplary construction of a pole piece of the present utility model;

FIG. 2 is a cross-sectional view taken along the direction 1a-1a in FIG. 1;

FIG. 3 is a schematic diagram of an exemplary cell of the present utility model;

fig. 4 is a schematic structural view of an example of a battery cell according to the present utility model;

FIG. 5 is a schematic diagram of an example of a powered device according to the present utility model;

fig. 6 is a schematic structural view of an example of the pole piece winding device of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				10	Pole piece	11	Current collector
12	Tab	13	Film layer
				14	Insulating layer	15	Isolation region
151	Isolation layer	16	Insulating extension layer
				20	Battery cell	21	Spacer member
30	Battery cell	40	Electric equipment
				41	Controller for controlling a power supply	42	Driving device
50	Bearing piece	60	First slurry conveying device
				70	Second slurry conveying device	80	Third slurry conveying device

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Batteries are widely used in a variety of powered devices including, but not limited to: cell phones, portable devices, notebook computers, battery cars, electric vehicles, ships, spacecraft, electric toys, electric tools, and the like. The battery referred to in the examples of the present disclosure refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. The battery cells are basic units in the battery, and can be generally divided into: cylindrical battery cells, cuboid battery cells and soft package battery cells. Hereinafter, it will be mainly developed around the rectangular parallelepiped battery cells. It should be understood that the embodiments described hereinafter are also applicable in certain respects to cylindrical battery cells or pouch battery cells.

The batteries mentioned in the art can be classified into disposable batteries and rechargeable batteries according to whether they are rechargeable or not. The types of rechargeable batteries that are currently common are: lead acid batteries, nickel hydrogen batteries, and lithium ion batteries. The battery has the overall structure mainly comprising a shell, a battery cell and electrolyte, wherein the battery cell is accommodated in the shell and comprises a positive pole piece, a negative pole piece and an isolating film. Among them, lithium batteries are one of the common batteries, and lithium ion batteries mainly rely on movement of lithium ions between a positive electrode tab and a negative electrode tab.

The materials of the existing lithium battery cell mainly comprise a positive electrode material, a negative electrode material, a diaphragm and electrolyte. The battery cell 30 includes a housing and a battery cell mounted in the housing, the battery cell is composed of a positive electrode plate, a negative electrode plate and a diaphragm, and electrolyte is injected into the housing. The positive electrode plate is provided with a positive electrode active material, and the negative electrode plate is provided with a negative electrode active material.

Among the most commonly used materials for the positive electrode material are lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials (polymers of nickel cobalt manganese). Among the negative electrode materials, natural graphite and artificial graphite are mainly used at present, and nitrides, PAS, tin-based oxides, tin alloys, nano negative electrode materials, and other intermetallic compounds and the like are also included. The cathode material is one of four constituent materials of the lithium battery, plays an important role in improving the capacity and cycle performance of the battery, and is a core link in the lithium battery industry. In the construction of lithium batteries, the separator is one of the critical inner layer components. The separator material is mainly a Polyolefin (polyethylene) separator based on Polyethylene (PE) and polypropylene (PP). The electrolyte is generally prepared from high-purity organic solvent, electrolyte lithium salt, additives and other raw materials. The electrolyte plays a role in conducting ions between the positive electrode and the negative electrode of the lithium battery, and ensures that the lithium battery has the advantages of high voltage, high specific energy and the like. In forming an electrode assembly, in some manufacturing processes, it is necessary to perform paste preparation, coating, cold pressing, winding, hot pressing, assembly, liquid injection, and formation.

The design factors of the battery mainly comprise performance parameters such as energy density, cycle life, discharge capacity, charge-discharge multiplying power and the like. In some cases, in the pole piece processing process of the battery, when pole piece slurry dries and contracts, the slurry film layer edge formed by the film layer is not clear, so that in the edge identification process by adopting equipment such as a CCD camera, the film layer edge of the film layer cannot be accurately positioned, further, the detection result is distorted, the risk pole piece material flows out, and further the product quality is influenced.

The utility model provides a pole piece aiming at the problem that the quality of the pole piece is affected due to inconvenient positioning and identification of the edge of the active material film layer of the existing pole piece, so as to conveniently identify and position the edge of the film layer of the pole piece and further effectively ensure the quality of the pole piece.

Referring to fig. 1 and 2, in some examples a pole piece 10 is disclosed, the pole piece 10 comprising a current collector 11, a film layer 13, and an insulating layer 14, the current collector 11 having a first surface; the film layer 13 is arranged on the first surface of the current collector 11; an insulating layer 14 is provided on the first surface of the current collector 11, the insulating layer 14 being spaced apart from the film layer 13, and an isolation region 15 being formed.

The current collector 11 is a structure or a part for collecting current, and is mainly referred to as a metal foil, such as copper foil and aluminum foil, on the lithium ion battery, and the material of the current collector 11 can be determined according to specific usage situations. The current collector 11 mainly collects the current generated by the film layer 13 so as to form a larger current to be output to the outside.

The film layer 13 has a layered structure provided in the thickness direction of the current collector 11. The film layer 13 is formed by an active material, and the specific type of the active material can be selected according to specific situations, for example, when the electrode sheet 10 is a cathode electrode sheet, the film layer 13 can be formed by lithium iron phosphate slurry. The film layer 13 may have a rectangular parallelepiped structure as a whole, or may have another shape. In order to make full use of the space, the general shape of the film layer 13 is the same as that of the current collector 11.

The current collector 11 has a substantially polyhedral structure, and in order to make full use of space, the current collector 11 is generally a sheet-like structure, and the current collector 11 is a sheet-like rectangular parallelepiped structure as shown in fig. 1. The current collector 11 has two surfaces disposed opposite to each other in the thickness direction, wherein any one of the surfaces in the thickness direction may be referred to as a first surface. In some examples, one of the first surfaces of current collector 11 is provided with the above-described film layer 13; in some examples, both first surfaces of the current collector 11 in the thickness direction are provided with the above-described film layer 13.

The insulating layer 14 is disposed on the first surface of the current collector 11 and is spaced from the film layer 13, where the edge of the film layer 13 near the insulating layer 14 is not in contact with the insulating layer 14, so that the film layer 13 and the insulating layer 14 are separated from each other, and a gap between the edges of the film layer 13 and the insulating layer 14 forms an isolation region 15. For convenience of description, the above-described film layer 13 and insulating layer 14 provided on a single first surface of the current collector 11 will be described below as an example.

The direction from the film layer 13 to the insulating layer 14 is a first direction, which is a direction 1b in fig. 1, taking the shape shown in fig. 1 as an example. The isolation region 15 is formed between the film layer 13 and the insulating layer 14. The width direction of the isolation region 15 extends in the direction 1b as in fig. 1, and the length direction of the isolation region 15 coincides with the general direction of the edge of the film layer 13, taking the shape as in fig. 1 as an example, the length direction of the isolation region 15 is the direction 1c as in fig. 1. It will be appreciated that the first surface of the current collector 11 may have other shapes, such as a circular shape or a shaped form, and this is merely a simple example of the length direction and the width direction of the isolation region 15, and is not limited thereto.

Taking the identification by using a CCD camera as an example, the isolation region 15 is formed between the film layer 13 and the insulating layer 14, and by setting the isolation layer 151, when the film layer 13 is identified by using the CCD camera, the edge position of the film layer 13 can be conveniently positioned, that is, the edge of the film layer 13 is directly positioned by using the CCD camera, so that the accurate identification of the edge position of the film layer 13 can be realized, and the problem of distortion of the detection result is avoided.

When the detection is carried out, as the CCD camera can detect along the length direction of the isolation region 15, the relative position of the isolation region 15 and the film layer 13 is determined, and when the position of the isolation region 15 is determined, the position of the edge of the film layer 13 can be indirectly determined through the position of the isolation region 15, so that the identification and the positioning of the position of the edge of the film layer 13 are further realized.

When the position of the insulating layer 14 is determined, the position of the edge of the film layer 13 can be indirectly determined through the position of the insulating layer 14, so that the identification and the positioning of the edge position of the film layer 13 are realized.

Since the film 13 and the insulating layer 14 are generally formed by solidifying slurry, the opposite edge positions of the film 13 and the insulating layer 14 are separated by arranging the isolation area 15 between the film 13 and the insulating layer 14, so that the problem of blurring of the edge of the film 13 caused by mutual infiltration of materials of the film 13 and the insulating layer 14 is prevented, and the problem of difficult recognition caused by unclear edge of the film 13 is further avoided.

In this example, since the insulating layer 14 and the film layer 13 are isolated from each other, in the molding or coating process of the insulating layer 14 and the film layer 13, a process window of processing can be controlled, so that the process parameters in the processing process can be conveniently adjusted, the repeatability of the processing process can be improved, and the processing cost can be further reduced.

Because the film layer 13 is provided with the active material, the insulation area 15 is arranged to prevent the edge positions of the insulation layer 14 and the film layer 13 from being infiltrated, so that the active material at the edge position of the film layer 13 and the active material at the edge of the film layer 13 caused by the infiltration of the insulation layer 14 cannot play a normal role, and the normal use of the active material of the film layer 13 can be ensured.

Because the active material of the film layer 13 determines the capacity of the battery monomer corresponding to the pole piece 10, the capacity of the battery monomer can be conveniently controlled by accurately identifying the edge position of the film layer 13 and preventing the material of the film layer 13 and the insulating layer 14 from being mixed, so that the effective control of the parameters of the battery monomer 30 is realized.

The insulating layer 14 in this example can be used to prevent the current collector 11 of the pole piece 10 from generating processing defects such as burrs and the like when the pole piece 10 is cut, prevent the burrs of the current collector 11 from generating lithium precipitation, and further help to ensure the quality of the pole piece 10.

In some examples, pole piece 10 further includes a separator 151 disposed on the first surface of current collector 11, separator 151 disposed on separator region 15. In this example, the isolation layer 151 is filled in the isolation region 15, so that the isolation layer 151 is between the insulating layer 14 and the film layer 13, so as to prevent the insulating layer 14 and the film layer 13 from contacting each other, and further avoid the problem of blurring of the edge of the film layer 13 caused by mutual infiltration of the film layer 13 and the insulating layer 14. Because the isolation layer 151 is filled in the isolation region 15, the isolation layer 151 covers the surface of the current collector 11 of the isolation region 15, so that the problem of lithium precipitation caused by the exposure of the current collector 11 is prevented, and the safety of the pole piece 10 is effectively improved.

The isolation layer 151 in this example may be a material that does not wet the film layer 13, and further, in some examples, the isolation layer 151 is made of an insulating material that does not wet the film layer 13 and the insulating layer 14 at the same time.

In some examples, the isolation layer 151 is a fluorine-containing resin material. The fluorine-containing resin is a melt fluorine-containing resin, has stability relative to most solvents, is almost insoluble in any solvent, and further makes the isolation layer 151 not easy to infiltrate with the active materials of the film layer 13, so that the problem of unclear edges of the film layer 13 caused by the mutual infiltration of the isolation layer 151 and the active materials of the film layer 13 is prevented. Because isolation layer 151 can not infiltrate with the active material of membrane layer 13 each other for the active material can normally exert its effect, and then effectively guarantees the free capacity of battery, promotes the free quality of battery.

The isolation layer 151 in this example is made of a fluorine-containing resin, so that the isolation layer 151 has good chemical stability, corrosion resistance and insulation, and further the problem that the quality of the battery monomer 30 is affected due to the mutual reaction between the isolation layer 151 and the electrolyte in the battery monomer 30 can be effectively prevented.

The isolation layer 151 in this example is made of a fluorine-containing resin, so that the isolation layer 151 is incompatible with the insulating layer 14, and thus the normal function of the insulating layer 14 is not affected.

Because fluorine-containing resin can be adhered to the current collector 11, the problem of powder falling is not easy to occur after the isolating layer 151 is formed, and when the fluorine-containing resin is used as the isolating layer 151 material to be formed on the current collector 11, the isolating layer 151 is not easy to fall off, and the structural stability of the isolating layer 151 can be ensured.

In some examples, at least one of ethyl acetate, butyl acetate, and isopropyl alcohol is used as a solvent, and a fluorine-containing resin material is dispersed in the solvent formed of the at least one material, so that the fluorine-containing resin and the solvent form a slurry to increase a drying speed of the separation layer 151, and after the separation layer 151 is solidified, no solvent residue is generated in the separation layer 151, and thus, before the coating of the film layer 13 and the insulating layer 14 is performed, the separation layer 151 may be first formed on the current collector 11, preventing the slurry from being mixed with the insulating paste. Because the isolation layer 151 can be formed on the current collector 11 before the film layer 13 and the insulating layer 14 are formed, the process window of the processing technology of each part can be prolonged, the equipment is conveniently controlled, the flexibility of controlling each parameter in the process step can be effectively improved, and the processing difficulty of the product can be reduced.

In some examples, barrier layer 151 is any one of teflon (PTFE), perfluoroethylene propylene copolymer (FEP), soluble Polytetrafluoroethylene (PFA), or ethylene-tetrafluoroethylene copolymer (ETFE). Wherein, teflon, perfluoroethylene propylene copolymer and soluble polytetrafluoroethylene are perfluorinated fluoroplastic, and have good flame retardant property and insulating property. The ethylene-tetrafluoroethylene copolymer material has good structural strength when molded, thus enabling the corresponding barrier layer 151 to have good wear resistance, mechanical properties, and corrosion resistance.

In this example, any one of the above materials is used as a solute, and at least one of ethyl acetate, butyl acetate, and isopropyl alcohol is used as a solvent, so as to form a slurry of the isolation layer 151, and since the solvent has volatility, after the slurry is coated on the current collector 11, the solvent can be volatilized rapidly, so that the isolation layer 151 of fluorine-containing resin material without solvent is formed on the current collector 11.

In some examples, the isolation layer 151 is formed by mixing at least two materials of teflon, perfluoroethylene propylene copolymer, soluble polytetrafluoroethylene or ethylene-tetrafluoroethylene copolymer.

With continued reference to fig. 1, in some examples, the spacer 151 has a width of not less than 0.8mm and not more than 1.5mm from the film 13 toward the insulating layer 14 (i.e., 1b in fig. 1). In this example, the isolation layer 151 is blocked between the insulating layer 14 and the film layer 13 to prevent the materials of the insulating layer 14 and the film layer 13 from infiltrating each other. By defining the width of the isolation layer 151, when the width of the isolation layer 151 is less than 0.8mm, the isolation layer 151 is too small in width, which is liable to cause isolation failure; when the width of the separation layer 151 is greater than 1.5mm, the width of the separation layer 151 is excessively large, and the width of the film layer 13 is correspondingly compressed, so that the capacity of the corresponding battery cell is reduced. The width of the barrier layer 151 in this example may be 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or any other value within the above interval.

In some examples, the direction from the film layer 13 toward the insulating layer 14 is a first direction (i.e., direction 1b in fig. 1), and the current collector 11 has a first side in the first direction; the insulating layer 14 is disposed to extend to the first side of the current collector 11, and the film layer 13 is disposed on a side of the insulating layer 14 away from the first side of the current collector 11.

Taking the shape as shown in fig. 1 as an example, the first side is a side of one end of the pole piece 10 in the width direction, the insulating layer 14 extends to the first side position, when cutting is performed, burrs are not easy to be generated at the cutting position of the current collector 11 due to the limitation of the insulating layer 14, and further the problem of lithium precipitation of the battery monomer caused by burrs or other cutting defects at the cutting position of the current collector 11 can be prevented, so that the safety performance of the battery monomer is effectively improved.

In some examples, the first side of the current collector 11 refers to an end surface of the current collector 11 in the first direction, that is, a side end surface in the thickness direction as in fig. 1, and the insulating layer 14 extends to the first side of the current collector 11, that is, the insulating layer 14 covers the side end surface in the thickness direction of the current collector 11.

Referring to fig. 2, in some examples, the first side of the current collector 11 refers to a border portion of the current collector 11 in the first direction, and the insulating layer 14 extends to the first side of the current collector 11, which means that the insulating layer 14 extends along the first direction on the first surface and does not extend to the surface in the thickness direction of the current collector 11.

With continued reference to fig. 1, in some examples, pole piece 10 further includes a tab 12 and an insulating extension layer 16: the tab 12 is connected with a first side edge of the current collector 11; the insulating extension layer 16 partially covers the tab 12, and the insulating extension layer 16 is disposed near the current collector 11 and is connected to the insulating layer 14.

The tab 12 is connected to the current collector 11, and the tab 12 is free of active material. The tab 12 serves as a current lead-out portion. The tab 12 of the positive electrode sheet 10 may be an aluminum alloy material, the tab 12 of the negative electrode sheet 10 may be a nickel material, and the negative electrode may be a copper nickel plating material. In some examples, tab 12 is integrally formed with current collector 11. When the current collector 11 is processed, the tab 12 structure may be simultaneously processed. In some examples, tab 12 is welded to current collector 11.

The insulating extension layer 16 covers one end of the tab 12 near the current collector 11, and the insulating extension layer 16 partially covers the tab 12, so that a portion of the tab 12, which is not covered with the insulating extension layer 16, can be butted with an external structure.

The insulating extension layer 16 is connected to the insulating layer 14 and extends in a first direction. The insulating extension layer 16 is used for forming an insulating material region at a position of the tab 12 close to the current collector 11, and when the current collector 11 or the tab 12 is cut, burrs or other cutting defects are prevented from being generated at the edge position of the tab 12 by the insulating extension layer 16, so that the problem of lithium precipitation of the battery cell is prevented. The insulating extension layer 16 in this example may be made of the same material as the insulating layer 14, or may be made of a different material.

The position that is provided with insulating extension layer 16 on the utmost point ear 12 in this example, the thickness of insulating extension layer 16 and utmost point ear 12 superposes each other, and then makes the structural strength of utmost point ear 12 promoted to make utmost point ear 12 be difficult to produce the deformation, when carrying out the equipment of battery monomer 30 and fixed, can avoid the dislocation of utmost point ear 12, effectively promote the stability of equipment or fixed process, and then improve battery monomer 30's machining efficiency.

In some examples, the insulating extension layer 16 is disposed at an end of the tab 12 adjacent to the current collector 11 in the first direction, and the width of the insulating extension layer 16 is not less than 1/3 of the width of the tab 12. Because the insulation extending layer 16 is matched with the tab 12, the overall thickness of the portion of the tab 12 provided with the insulation extending layer 16 is increased, and after the insulation extending layer 16 is solidified, the insulation extending layer 16 supports the tab 12, so that the structure of the tab 12 is relatively stable, and the tab is conveniently in butt joint with an external structure. By limiting the width of the insulation extension layer 16 to be not less than 1/3 of the width of the tab 12, the insulation extension layer 16 is supported at least at one end portion of the tab 12 close to the current collector 11, and the tab 12 can be in a certain unfolding state, so that subsequent connection and fixation are facilitated. In this example, the width of the insulating extension layer 16 is less than the width of the tab 12 to enable the tab 12 to be used to interface with external structures.

Referring to fig. 3, the present utility model further proposes an example of a battery cell 20 based on the above-mentioned pole piece 10, where the battery cell 20 includes the pole piece 10 according to any of the above examples.

The battery cell 20 in this example includes a positive electrode tab 10 and a negative electrode tab 10, and a separator 21 disposed between the positive electrode tab 10 and the negative electrode tab 10, wherein at least one of the positive electrode tab 10 and the negative electrode tab 10 is the tab 10 described in any of the above examples. By adopting the pole piece 10, the film 13 of the pole piece 10 can be conveniently identified and positioned, so that the problem of the quality reduction of the battery cell 20 caused by the outflow of the pole piece 10 with risk is prevented. It will be appreciated that the cells 20 in this example may be generally rectangular parallelepiped in shape as shown in fig. 3, and that the cells 20 may be other shapes, such as cylindrical shapes wound with pole pieces 10.

It should be noted that, since the example of the battery cell 20 of the present utility model is based on the example of the pole piece 10, the example of the battery cell 20 of the present utility model includes all the technical solutions of all the examples of the pole piece 10, and the achieved technical effects are identical, and are not repeated herein.

Referring to fig. 4, the present utility model further provides an example of a battery cell 30 based on the above-mentioned battery cell 20, where the battery cell 30 includes the battery cell 20 as described in the above example.

The battery cell 30 in this example adopts the above-mentioned electric core 20, and can effectively prevent the pole piece 10 that has risk from being output to the next process because the membrane layer 13 of the pole piece 10 can be more easily identified and positioned, and then the security of the battery cell 30 is guaranteed. Because the membrane layer 13 is mutually isolated from the insulating layer 14 through the isolation region 15, the edge position of the membrane layer 13 cannot be infiltrated with the insulating layer 14, and active materials of the membrane layer 13 can fully play a role, so that the battery monomer capacity is stable, and the product quality is effectively ensured. It should be understood that fig. 4 is only an example of the form of the battery cell 30, and is not intended to limit the form of the battery cell 30.

In some examples, the battery cell 30 is a lithium iron phosphorus battery cell. Because the problem that the edges of the film layer 13 are unclear is more likely to occur in the slurry of the lithium iron phosphorus battery monomer than in the slurry of the ternary lithium battery monomer, the above-mentioned battery cell 20 is adopted for the lithium iron phosphorus battery monomer 30 in this example, so as to ensure the safety and stability of the lithium iron phosphorus battery monomer 30.

The present utility model also provides an example of the electric device 40 based on the battery cell 30, where the electric device 40 includes the battery cell 30 according to any one of the examples.

In this example, powered device 40 includes, but is not limited to: cell phones, portable devices, notebook computers, battery cars, electric vehicles, boats, spacecraft, electric toys, and electric tools, etc., for example, spacecraft including airplanes, rockets, space planes, and spacecraft, etc., electric toys including fixed or mobile electric toys, for example, game machines, electric vehicle toys, electric ship toys, and electric plane toys, etc., electric tools including metal cutting electric tools, grinding electric tools, fitting electric tools, and railway electric tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

Referring to fig. 5, for convenience of description, the following embodiments take the electric device 40 according to an embodiment of the present application as an example of a vehicle.

For example, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application, where the vehicle may be a fuel-oil vehicle, a gas-fuel vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A driving device 42 may be provided in the vehicle, and the driving device 42 may be a motor, a controller 41 and a battery unit 30, where the controller 41 is configured to control the battery unit 30 to supply power to the motor. For example, the battery cell 30 may be provided at the bottom or the head or tail of the vehicle. The battery cell 30 may be used for power supply of the vehicle, for example, the battery cell 30 may be used as an operating power source for the vehicle, for circuitry of the vehicle, for example, for starting, navigation, and operational power requirements of the vehicle when running. In another embodiment of the present application, the battery cell 30 may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle. To meet different power usage requirements, the vehicle may include a plurality of battery cells 30, where the plurality of battery cells 30 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to a mixture of series and parallel connections.

Referring to fig. 6, the present utility model further proposes an example of a pole piece 10 processing apparatus on the basis of the above example of the pole piece 10, where the pole piece 10 processing apparatus is used for processing the pole piece 10 according to any one of the above examples, and the pole piece 10 processing apparatus includes a carrier 50, a first slurry conveying device 60, a second slurry conveying device 70, and a third slurry conveying device 80; the carrier 50 is used for carrying the current collector 11; a first slurry transporting device 60 is disposed adjacent to the carrier 50, the first slurry transporting device 60 being configured to output slurry forming the film layer 13 to the current collector 11; a second paste transfer device 70 is provided adjacent to the carrier 50, the second paste transfer device 70 being for outputting paste forming the insulating layer 14 to the current collector 11; a third slurry delivery device 80 is provided adjacent to the carrier 50, the third slurry delivery device 80 being configured to deliver slurry forming the separator layer 151 to the current collector 11.

The carrier 50 is used for carrying the current collector 11, wherein the carrier 50 may be a roller structure or other structures capable of supporting and/or conveying and being three-dimensional.

In some examples, the first slurry delivery device 60 and the second slurry delivery device 70 are integrally provided. The first slurry transporting device 60 and the second slurry transporting device 70 are respectively provided with output ports to simultaneously output the corresponding slurries respectively at both sides of the isolating layer 151 in the width direction.

When the pole piece 10 processing apparatus is operated, the isolating layer 151 may be formed on the current collector 11, and after the isolating layer 151 is solidified and formed, the film layer 13 and/or the insulating layer 14 may be formed on the current collector 11. Since the isolation layer 151 is formed first, after the isolation layer 151 is solidified, the isolation layer 151 material cannot infiltrate the film 13 layer, so as to prevent the edge of the film 13 from being unclear.

In some examples, the third slurry transporting device 80 is disposed between the first slurry transporting device 60 and the carrier 50, such that the third slurry transporting device 80 first forms the separator 151 on the current collector 11, and after the separator 151 is solidified and formed, the film layer 13 and the insulating layer 14 are formed.

In this example, the molding time of the isolation layer 151 may be controlled by controlling the operation state of the carrier 50, so that the isolation layer 151 is in a solidified state when the film layer 13 and the insulating layer 14 are coated, preventing the isolation layer 151 and the film layer 13 from being mutually infiltrated.

In some examples, the separation layer 151 is formed by mixing a fluorine-containing resin and a volatile solvent to form a mixed slurry, and after the separation layer 151 is coated on the current collector 11, the volatile solvent is volatilized before the current collector 11 is conveyed to the first slurry conveying device 60 and the second slurry conveying device 70, the fluorine-containing resin is solidified and formed to form a separation layer 151 structure, and the separation layer 151 is completely solidified by controlling the running speed and/or the running path of the current collector 11 and then the coating of the film layer 13 is performed.

In some examples, the distance between the third slurry delivery device 80 and the first slurry delivery device 60 is no less than 30cm and no more than 50cm.

By defining the distance between the third slurry transporting device 80 and the first slurry transporting device 60 in this example, the setting time of the separator 151 may be determined as needed, and thus the separator 151 slurry may be in a set state when the first slurry transporting device 60 coats the slurry on the current collector 11. In this example, when the distance between the third slurry transporting device 80 and the first slurry transporting device 60 is less than 30cm, the slurry form is unstable due to the insufficient setting time of the slurry of the separation layer 151, and the slurry coating of the film layer 13 is affected. When the distance between the third slurry transporting device 80 and the first slurry transporting device 60 is greater than 50cm, the volume of the overall structure is excessively large, so that the space occupied by the apparatus is excessively large. The distance between the first slurry transporting device 60 and the third slurry transporting device 80 in this example may be 30cm, 35cm, 40cm, 45cm, 50cm, or any other value within the above-mentioned interval.

Since the separator 151 is first formed in a solidified state on the current collector 11, the first slurry transporting device 60 and the second slurry transporting device 70 may be provided as an integrated structure when the coating of the film layer 13 and the insulating layer 14 is performed, and thus the first slurry transporting device 60 and the second slurry transporting device 70 may simultaneously coat the film layer 13 and the insulating layer 14 on both sides of the separator 151 in the width direction, so that the rapid formation of the pole piece 10 is achieved.

Referring to fig. 1 to 6, in some examples, a pole piece 10 is disclosed, the pole piece 10 having a current collector 11 and a film layer 13 and an insulating layer 14 provided on one end face in a thickness direction of the current collector 11, the film layer 13 and the insulating layer 14 having a gap therebetween, and a separation layer 151 formed of fluorine-containing resin filled in the gap between the film layer 13 and the insulating layer 14. By arranging the isolation layer 151, the film layer 13 and the insulating layer 14 are prevented from being mutually infiltrated, and the problems of inaccurate identification and positioning caused by unclear edges of the film layer 13 can be avoided. Due to the blocking of the mutual infiltration between the film layer 13 and the insulating layer 14, active materials at the edge position of the film layer 13 close to the insulating layer 14 can also be kept in a stable state, and participate in the electrochemical reaction of the battery monomer 30, so that the capacity of the battery monomer 30 is effectively ensured, and the safety of the battery monomer 30 is further improved. Because the isolating layer 151 adopts the fluorine-containing resin, the fluorine-containing resin does not react with the electrolyte and is insoluble in the materials of the film layer 13 and the insulating layer 14, the structure of the isolating layer 151 is relatively stable, and the normal use of the battery cell 30 is not affected.

Further, in this example, the third slurry transporting device 80 for transporting the slurry required for the separator 151 is disposed between the carrier 50 of the current collector 11 and the first slurry transporting device 60 for transporting the slurry required for the film 13, and the distance between the third slurry transporting device 80 and the first slurry transporting device 60 is not less than 30cm and not more than 50cm, so that the separator 151 slurry can have a sufficient setting time, and the volume of the whole apparatus can be reduced as much as possible, effectively improving the quality of the produced pole piece 10.

The foregoing description is only a preferred example of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model in the specification and drawings, or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A pole piece, comprising:

a current collector having a first surface;

the film layer is arranged on the first surface of the current collector;

the insulating layer is arranged on the first surface of the current collector, is arranged between the insulating layer and the film layer, and is provided with an isolation region; and

2. The pole piece of claim 1, wherein the separator is a fluororesin material.

3. The pole piece of claim 2, wherein the separator is any one of teflon, perfluoroethylene propylene copolymer, soluble polytetrafluoroethylene or ethylene-tetrafluoroethylene copolymer.

4. A pole piece according to claim 1, characterized in that the width of the isolating layer is not less than 0.8mm and not more than 1.5mm from the film layer towards the insulating layer.

5. A pole piece according to any of claims 1-4, characterized in that the direction from the film layer to the insulating layer is a first direction, the current collector having a first side in the first direction;

6. The pole piece of claim 5, further comprising:

7. The pole piece of claim 6, wherein the insulating extension layer is disposed at an end of the tab adjacent the current collector, and wherein the insulating extension layer has a width along the first direction that is not less than 1/3 of the width of the tab.

8. A cell comprising a pole piece according to any one of claims 1 to 7.

9. A battery cell comprising the cell of claim 8.

10. The battery cell of claim 9, wherein the battery cell is a lithium iron phosphorus battery.

11. A powered device comprising the battery cell of claim 10.

12. A pole piece processing apparatus for processing the pole piece as claimed in any one of claims 1 to 7, characterized in that the pole piece processing apparatus comprises:

a carrier for carrying the current collector;

13. A pole piece processing device as claimed in claim 12, wherein the third slurry delivery means is provided between the first slurry delivery means and the carrier.

14. The pole piece processing device of claim 13, wherein the distance between the third slurry delivery means and the first slurry delivery means is no less than 30cm and no more than 50cm.