CN113113559B - Battery cell pole piece rolling method and battery cell pole piece - Google Patents
Battery cell pole piece rolling method and battery cell pole piece Download PDFInfo
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- CN113113559B CN113113559B CN202110333827.4A CN202110333827A CN113113559B CN 113113559 B CN113113559 B CN 113113559B CN 202110333827 A CN202110333827 A CN 202110333827A CN 113113559 B CN113113559 B CN 113113559B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
The application provides a battery cell pole piece rolling method and a battery cell pole piece. The method for rolling the battery cell pole piece comprises the following steps: providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section; providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection; sticking a thickness compensation film on the lug connecting surface of the single-side coating subsection to obtain a pole piece semi-finished product; rolling the semi-finished pole piece; and removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product. The single-side coating subsection electrode coating is adhered with the thickness compensation glue in a subsection mode, the single-side coating subsection tab connecting surface is covered with the thickness compensation glue, the total thickness of the single-side coating subsection of the battery cell pole piece can be increased, the compactness of the single-side coating subsection electrode coating is improved, the combination degree of active substances of the electrode coating and conductive agent particles is further improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
Description
Technical Field
The invention relates to the field of battery pole piece processing, in particular to a battery pole piece rolling method and a battery pole piece.
Background
In the processing of electric core, it is an indispensable ring to roll in the pole piece of electric core, and the roll-in of pole piece is through the compression roller to the electrode material on the pole piece compaction for the holistic thickness of pole piece descends, and then can promote the coiling density of electric core, reaches the effect that increases the electric energy reserve volume of battery.
When the battery core pole piece is coated, electrode materials are required to be coated on two surfaces of the current collecting piece body, when the current collecting piece body is coated for a certain length, one surface of the current collecting piece body is temporarily stopped to be coated, so that a section of uncoated area is formed on the surface of the current collecting piece body, and the uncoated part is an area for connecting with a pole lug.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a battery pole piece rolling method and a battery pole piece, which can improve the rolling uniformity of a single-side coating section and a double-side coating section of the pole piece, can improve the compactness of an electrode coating of the single-side coating section, and improve the conduction efficiency of the single-side coating section of the pole piece.
The purpose of the invention is realized by the following technical scheme:
a method for rolling battery cell pole pieces comprises the following steps:
providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section;
providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection;
adhering the thickness compensation film to the lug connecting surface of the single-side coating section to obtain a semi-finished product of the pole piece;
rolling the pole piece semi-finished product;
and removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product.
In one embodiment, in the step of rolling the semi-finished product of the pole piece, the semi-finished product of the pole piece is kept in a straight state in the rolling process.
In one embodiment, the width of the thickness compensation film is equal to the width of the tab connection surface, and the length of the thickness compensation film is smaller than the length of the tab connection surface.
In one embodiment, after the step of providing the cell pole piece and before the step of providing the thickness compensation film, the cell pole piece rolling method further includes the following steps:
measuring the size of the lug connecting surface of the single-side coating subsection;
setting a rolling gap of the battery cell pole piece;
and manufacturing a thickness compensation film according to the size of the lug connecting surface of the single-side coating section and the rolling gap of the battery cell pole piece.
In one embodiment, after the step of adhering the thickness compensation film to the tab connection surface of the single-sided coating segment and before the step of performing a rolling operation on the pole piece semi-finished product, the cell pole piece rolling method further includes the following steps:
and preheating the pole piece semi-finished product.
In one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically comprises:
and rolling the semi-finished product of the pole piece for multiple times.
In one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically comprises: and carrying out multiple rolling operations on the semi-finished product of the pole piece, wherein the rolling gap of the multiple rolling operations is gradually reduced along with the increase of the rolling times.
In one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically comprises:
and rolling the semi-finished product of the pole piece for multiple times, wherein the rolling gap of the multiple rolling operations is gradually reduced along with the increase of the rolling times, and the variable quantity of the rolling gap of any two adjacent rolling operations is equal.
In one embodiment, the pole piece semi-finished product is heated at the same time when being rolled each time, and the temperature of the multiple times of heating is gradually reduced along with the increase of the rolling times.
A battery cell pole piece is prepared by the battery cell pole piece rolling method in any one of the embodiments.
Compared with the prior art, the invention has at least the following advantages:
the single-side coating subsection thickness compensation adhesive is coated and adhered on the single side of the battery cell pole piece in a subsection mode, the single-side coating subsection lug connecting surface is covered by the thickness compensation adhesive, the thickness compensation effect can be achieved on the single-side coating subsection, the total thickness of the single-side coating subsection of the battery cell pole piece is increased, the pressing force of the single-side coating subsection when the single-side coating subsection is rolled by the receiving roller is consistent with that of the double-side coating subsection, the compactness of the electrode coating of the single-side coating subsection is improved, the combination degree of active substances of the electrode coating and conductive agent particles is improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flow chart of a cell pole piece rolling method in an embodiment;
fig. 2 is a schematic structural diagram of a pole piece rolling device adopted in step S400 of the cell pole piece rolling method shown in fig. 1;
fig. 3 is a schematic structural diagram of another view angle of the pole piece rolling device shown in fig. 2.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a cell pole piece rolling method according to an embodiment includes the following steps: providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section; providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection; adhering the thickness compensation film to the lug connecting surface of the single-side coating section to obtain a semi-finished product of the pole piece; carrying out rolling operation on the pole piece semi-finished product; and removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product.
In order to better understand the rolling method of the battery cell pole piece of the present invention, the following further explains the rolling method of the battery cell pole piece of the present invention, and the rolling method of the battery cell pole piece comprises the following steps:
s100, providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section. Uniformly mixing the anode rear negative powder with other ingredients to prepare slurry, coating the slurry on a current collecting sheet body, and cooling the slurry on the current collecting sheet body to form the battery cell pole piece in the step.
And S200, providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection. In this step, a thickness compensation film is provided, one side of the single-side coating section of the battery pole piece, which is not coated with the electrode slurry, is a pole lug connection surface, the shape of the thickness compensation film is matched with that of the pole lug connection surface, and the thickness compensation film is used for being attached to the pole lug connection surface, so that the total thickness of the single-side coating section bonded with the thickness compensation film is increased.
And S300, adhering the thickness compensation film to the lug connecting surface of the single-side coating subsection to obtain a semi-finished pole piece. In this step, the thickness compensation film provided in the previous step is adhered to the single-side coating section of the battery cell pole piece, so that the thickness compensation film covers the tab connection surface of the single-side coating section, and further the total thickness of the single-side coating section is increased.
S400, rolling the semi-finished product of the pole piece. In this embodiment, the roll squeezer that carries out roll-in processing includes two roll-in axles, two roll-in axle parallel arrangement, and be provided with certain clearance between two roll-in axles, this clearance is the roll-in clearance of electric core pole piece promptly, in inserting into the clearance between two roll-in axles with electric core pole piece, rotate along with two roll-in axles, electric core pole piece will be transported under the frictional force of two roll-in axles, electric core pole piece is rolled in by two roll-in axles jointly at the in-process of being transported, the electrode coating of electric core pole piece will be flattened, make the thickness of electric core pole piece reduce, and then can promote the coiling density of electric core, reach the effect that increases the electric energy reserve volume of battery. In the step, the semi-finished product of the pole piece pasted with the thickness compensation film is rolled, when the single-side coating subsection passes between the two rolling shafts, the two rolling shafts roll the single-side coating subsection pasted with the thickness compensation glue, and the thickness compensation glue increases the total thickness of the single-side coating subsection of the battery cell pole piece, so that the pressing force of the two rolling shafts on the single-side coating subsection is enhanced, the compactness of the electrode coating in the rolled single-side coating subsection is increased, the combination degree of active substances of the electrode coating and conductive agent particles is further improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
And S500, removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product. In the last step, the single-side coating subsection pasted with the thickness compensation glue is rolled by a rolling machine, so that the compactness of the electrode coating in the rolled single-side coating subsection is increased, in the step, the thickness compensation glue on the single-side coating subsection is removed, the lug connecting surface of the battery cell pole piece is exposed again, a pole piece finished product is obtained, and the lug of the battery cell can be in contact connection with the lug connecting surface of the battery cell pole piece.
Further, during the conventional rolling process of the pole piece, since the thicknesses of the single-side coating segment and the double-side coating segment of the pole piece are not consistent, when the rolling device rolls the pole piece, the rolling pressure applied to the single-side coating segment of the pole piece is smaller than that applied to the double-side coating segment, so that the compactness of the electrode coating of the single-side coating segment is low, the combination of active substances in the electrode coating of the single-side coating segment and conductive agent particles is not tight enough, and the reduction of the conductive efficiency of the pole piece is finally caused. In this embodiment, the single-side coating segment of the battery cell pole piece is coated and adhered with the thickness compensation adhesive in a segmented manner, so that the thickness compensation adhesive covers the tab connecting surface of the single-side coating segment, a thickness compensation effect on the single-side coating segment can be achieved, the total thickness of the single-side coating segment of the battery cell pole piece is increased, the pressing force of the single-side coating segment when the single-side coating segment receives the rolling of the rolling wheel is consistent with that of the double-side coating segment, the compactness of the electrode coating of the single-side coating segment is improved, the combination degree of active substances of the electrode coating and conductive agent particles is further improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
In one embodiment, in the step of rolling the semi-finished product of the pole piece, the semi-finished product of the pole piece is kept in a straight state in the rolling process. In the rolling process of the semi-finished pole piece, if the plane of the pole piece is in a bending state when the pole piece passes through a rolling shaft, the electrode material on one surface of the pole piece is stretched, the motor material on the other surface of the pole piece is compressed, after the pole piece in the bending state is rolled, the electrode material on one surface of the pole piece is stretched and is likely to generate cracks after being rolled, so that a current collector is directly exposed, and the electrode material on the other surface of the pole piece is compressed and is likely to be wound and wrinkled after being rolled. Therefore, in the embodiment, the semi-finished product of the pole piece is kept in a flat state in the rolling process, the quality and the state of the electrode materials on two surfaces of the pole piece are uniform when the pole piece is in the flat state, the roller pressure degrees of the two surfaces are consistent when the pole piece is rolled, and the compression molding effect is consistent, so that the compactness of the electrode materials on the two surfaces of the pole piece is consistent, and therefore, each part in the pole piece of the battery cell has better conductive efficiency, and the battery cell after being wound has better electrical performance.
In one embodiment, the width of the thickness compensation film is equal to the width of the tab connection surface, and the length of the thickness compensation film is smaller than the length of the tab connection surface. When the electrode material on the pole piece is rolled by the rolling wheel, the electrode material rolled by the rolling wheel is partially extruded to two sides of the rolling wheel, and when the battery cell pole piece adhered with the thickness compensation glue is rolled, the electrode material on the double-sided coating subsection adjacent to the thickness compensation glue adhered on the single-sided coating subsection is extruded to the thickness compensation glue under the pressure action of the rolling wheel, so that the edge thickness of the single-sided coating subsection adjacent to the double-sided coating subsection is increased, when the edge of the single-sided coating subsection is rolled, the pressure bearing degree of the edge is increased, the electrode material of the single-sided coating subsection is not uniformly pressed, the inconsistency of the conductive efficiency is caused, and in addition, the deformation of the current collecting sheet body is larger due to overlarge pressure, and the conductive effect is further influenced. Therefore, in this embodiment, the width of the thickness compensation film is equal to the width of the tab connection surface, and the length of the thickness compensation film is smaller than the length of the tab connection surface, so that the edge bordering the tab connection surface and the double-sided coating segment is not covered by the thickness compensation film, and when rolling, the electrode material on the double-sided coating segment is pressed to be extruded to the position of the single-sided coating segment, which is not covered by the thickness compensation film, so that the local thickness of the battery cell pole piece caused by overlapping of the electrode material and the thickness compensation film can be avoided from being too large, and the rolling pressure applied to each part of the battery cell pole piece is consistent.
In one embodiment, after the step of providing the cell pole piece and before the step of providing the thickness compensation film, the cell pole piece rolling method further includes the following steps: measuring the size of the lug connecting surface of the single-side coating subsection; setting a rolling gap of the battery cell pole piece; and manufacturing a thickness compensation film according to the size of the lug connecting surface of the single-side coating section and the rolling gap of the battery cell pole piece. In this embodiment, after the step of providing the thickness compensation film and before the step of providing the thickness compensation film, the size of the tab connection surface needs to be measured, and the rolling gap of the cell pole piece needs to be preset to obtain a thickness compensation piece with better adaptation degree; the rolling gap of the battery core pole piece is set so that the pressure degrees of the electrode material of the single-side coating subsection and the electrode material of the double-side coating subsection are consistent, specifically, the pressure degrees of the electrode material of the single-side coating subsection and the electrode material of the double-side coating subsection are consistent, the thickness of the thickness compensation film needs to be the same as the thickness of the rolled single-layer electrode material, and the double-side coating subsection sequentially consists of the electrode material layer, the current collector body layer and the electrode material layer And (5) fruit.
After the coating processing is carried out on the battery core pole piece, the battery core pole piece needs to be cooled, the rolling processing can be carried out after the electrode coating on the battery core pole piece is cooled, and the cooled electrode material has lower molecular activity and higher hardness, so that the electrode material is difficult to be uniformly compressed when the rolling processing is carried out, the bonding strength of active substances and a conductive agent in the electrode material is lower, and the conductive efficiency of the pole piece is poorer. Meanwhile, when the cooled pole piece is rolled and processed, the electrode material on the pole piece is difficult to be uniformly compressed, so that the compactness of the inner layer of the electrode material layer is smaller than that of the outer layer, and the combination strength of the electrode material and the current collector is insufficient due to the lower compactness of the inner layer of the electrode material, so that the situation that the electrode material falls off from the current collector body occurs in the use process of the pole piece. In order to solve the problems of low bonding degree of active substances and conductive agents of electrode materials and insufficient bonding strength of the electrode materials and current collectors caused by the fact that the cooled electrode plates are difficult to be uniformly compressed, in one embodiment, after the step of adhering the thickness compensation film to the tab connection surface of the single-side coating segment and before the step of performing rolling operation on the semi-finished electrode plate, the cell electrode plate rolling method further comprises the following steps: and preheating the pole piece semi-finished product. In this embodiment, before carrying out the roll-in to electric core pole piece, preheat electric core pole piece earlier, preheat the back, the molecular activity degree of the electrode material on the electric core pole piece will obtain improving, and electrode material's loose degree promotes for electrode material is compressed tightly by the roll-in axle more easily, helps reducing the time of roll-in processing, improves machining efficiency. Meanwhile, because the looseness and the molecular activity of the electrode material are improved, the pressure of the rolling shaft is easier to act on the internal electrode material adjacent to the current collecting sheet body, so that the uniformity of the internal pressure and the external pressure of the electrode material is better, the active substances in the electrode material are combined with the conductive agent more uniformly and tightly, and the effect of improving the conductive efficiency of the battery core pole piece is achieved. Finally, because the looseness and the molecular activity of the electrode material are improved, the pressure of the rolling shaft is easier to act on the internal electrode material adjacent to the current collecting sheet body, so that the bonding strength of the electrode material and the current collecting sheet body is better, the electrode material is not easy to fall off from the current collecting sheet body in the using process, and the cycle life and the safety performance of the battery are further improved.
When the pole piece is rolled, if the pole piece reaches the preset thickness through single rolling, the rolling processing time of the pole piece in unit area is short, the roller pressure born by the pole piece in unit area formed through single rolling is large, the pole piece is rolled to the preset thickness under the action of rapid and strong pressure, so that the longitudinal and deep rolling degree of the electrode material layer is inconsistent, namely the surface layer part of the electrode material layer adjacent to a rolling shaft is rolled to be compact, and the inner layer part of the electrode material layer adjacent to a current collecting sheet body is loose, so that the integral rolling degree of the electrode material is poor, a large amount of conductive agent particles are not tightly combined with active substances in the electrode material, and the conductive efficiency of the electrode material is poor. Meanwhile, the electrode material is inevitably rebounded to a certain degree after being rolled, and the pole piece formed by single rolling is rolled to a preset thin thickness under the action of rapid and strong pressure, so that the rolled structure of the pole piece is unstable, the electrode material generates a larger rebounding amount, the rolled thickness of the pole piece is unqualified, and the energy density of the battery cell is lower. Meanwhile, when the pole piece is formed by single rolling, the rolling processing time of the electrode material in unit area is short, the rolling shaft cannot well level the pole piece, and some large small hard blocks which are not rolled and crushed exist in the electrode material, so the smoothness and the flatness of the surface of the pole piece are low, when the flatness of the pole piece is low, a large gap is easily generated inside a battery core formed by winding the pole piece, the energy density of the battery is reduced, when the smoothness of the pole piece is low, the pole piece and the diaphragm are wound together to form the battery core, the small hard blocks and burrs on the surface of the pole piece easily pierce the diaphragm, the diaphragm is damaged, and the battery short circuit is caused. The method aims to solve the problems that the compactness of the inner layer and the outer layer of an electrode material is not uniform, the rolled electrode material has large resilience, and the smoothness and the flatness of the surface of a pole piece are low due to single-time rolling forming of the pole piece. In one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically comprises: and rolling the semi-finished product of the pole piece for multiple times. Therefore, in this embodiment, when the semi-finished product of the electrode sheet is rolled, a single rolling operation with a large rolling pressure each time is divided into multiple times, and the pressure of each rolling operation is smaller than the force of each single rolling molding, so that when the electrode sheet is subjected to rolling action with a large number of times and a moderate force, the rolling pressure can better act on the inner layer part of the electrode material, so that the inner and outer layer parts of the electrode material can have a good compactness, the conductive agent particles in the electrode material are tightly combined with the active substance, and further the conductive efficiency of the electrode material is improved. Meanwhile, although the electrode material is subjected to roll-in operation and rebounds, the structure of the electrode material is more and more stable along with the increase of the rolling times, and the rebounding effect of the electrode material is gradually reduced through multiple times of roll-in operation, so that the thickness of the pole piece is more light and thin, and the rolling quality of the pole piece is better. Finally, the pole pieces are rolled for multiple times, so that some larger hard blocks which are not rolled and crushed in the electrode material can be crushed, the smoothness of the surfaces of the pole pieces is improved, the surfaces of the electrode materials are prevented from piercing through the diaphragms, and the safety of the battery cell is improved; the rolling not only can play a thinning role, but also can play a leveling role, and the smoothness of the pole piece can be effectively improved through multiple times of rolling, so that the gap in the wound battery cell is reduced, and the battery cell wound by the pole piece has higher energy density.
When the pole piece is rolled for multiple times, after the pole piece is rolled for one time, if the pole piece is rolled for the next time by continuously adopting the same rolling gap, the rolling pressure applied to the pole piece is smaller than that of the last rolling operation, so that the subsequent rolling processing efficiency of the electrode material is lower. Meanwhile, if the rolling gap adopted by each rolling is the same, the roller pressure degree borne by the pole piece in the subsequent rolling processing is obviously smaller than that in the first rolling, and the rebound degree of the pole piece is larger when the rolling pressure borne by the pole piece in a single time is larger, so that the rebound degree of the pole piece after the first rolling is larger, and the thickness degree of the pole piece is unqualified. The rolling gap adjusting device aims to solve the problems that rolling efficiency is low and the thickness rebound quantity of a pole piece is large due to the fact that multiple times of rolling operation are conducted on the pole piece through the same rolling gap. In one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically comprises: and carrying out multiple rolling operations on the semi-finished product of the pole piece, wherein the rolling gap of the multiple rolling operations is gradually reduced along with the increase of the rolling times. The rolling gap is a gap between two rolling shafts in the rolling device, the rolling gap of multiple rolling operations is gradually reduced along with the increase of the rolling times, the rolling gap is gradually reduced, namely, the gap between the two rolling shafts is gradually reduced when the rolling operations are carried out for multiple times, so that the rolling pressure applied to the pole piece during rolling at each time can be more consistent when the pole piece is rolled at each time in the process of carrying out multiple rolling processing, the effect of well reducing the thickness of the pole piece can be achieved after each rolling processing, and the rolling processing efficiency of the pole piece is further improved. Meanwhile, when the rolling pressure applied to the pole piece is consistent every time, the rolling pressure applied to the pole piece every time is moderate, so that the rebound quantity of the pole piece is reduced, the thickness of the pole piece is thinner, and the energy density of the battery cell is further improved.
In order to ensure that the rolling pressure born by the pole piece is consistent during the process of rolling the pole piece for multiple times and each time. In one embodiment, the step of performing a rolling operation on the semi-finished product of the pole piece specifically comprises: and rolling the semi-finished product of the pole piece for multiple times, wherein the rolling gap of the multiple rolling operations is gradually reduced along with the increase of the rolling times, and the variable quantity of the rolling gap of any two adjacent rolling operations is equal. In this embodiment, the variation of the roll-in clearance of arbitrary adjacent twice roll-in operation equals, when carrying out the roll-in operation promptly many times, the clearance between two roll-in axles of roll-in device reduces gradually, and the decrement in the clearance of two roll-in axles equals when roll-in operation at every turn, thus, the roll pressure degree that the pole piece received when making at every turn roll-in is comparatively unanimous, make the pole piece can be rolled forming to predetermined thickness gradually under comparatively suitable roll-in pressure effect, can make the electrode material layer when carrying out the roll-in at every turn, roll-in pressure can be used in the interior outer layer of electrode material comparatively evenly, help promoting the uniformity that the interior outer layer of electrode material was rolled in, in order to improve the conductive efficiency of electrode material.
When the pole piece is rolled for multiple times, the pole piece is more difficult to be pressed to be thinner along with the increase of the rolling times, and the rolling processing efficiency of subsequent rolling is reduced. In order to solve the problem that the rolling processing efficiency of subsequent rolling is low when the pole piece is rolled for multiple times, in one embodiment, the pole piece semi-finished product is heated when rolled each time. In this embodiment, when carrying out the roll-in to the pole piece at every turn, heat the pole piece simultaneously, the pole piece is heated the back, and electrode material's molecule activeness will rise, helps making electrode material more loose, and electrode material's the promotion of the degree of looseness can make electrode material more easily by the slimming, helps promoting the machining efficiency of roll-in. Meanwhile, the electrode plate is heated, so that moisture in the electrode material is removed, the water content in the electrode material is reduced, and the electrode material has a better conductive effect.
When the temperature is higher, help carrying out roll-in moulding to electrode material, but electrode material's resilience ability also can improve, and the higher the temperature is the longer the electrode material cooling time also, and the resilience degree of pole piece also can increase promptly, is unfavorable for finally forming frivolous pole piece. In order to solve the problem that the rebound degree of the pole piece is large due to the fact that the pole piece is heated in the rolling process, furthermore, when the pole piece semi-finished product is rolled at each time, the pole piece semi-finished product is heated, and the temperature of multiple times of heating is gradually reduced along with the increase of the rolling times, so that when the rolling operation is about to be completed for multiple times, the heating temperature of the pole piece is low, the cooling time of an electrode material is reduced, the rebound degree of the electrode material is reduced, the thickness of the pole piece is lighter and thinner, and the energy density of an electric core is further improved.
The thickness compensation film is pasted on the single face coating segmentation of pole piece, and the pole piece needs preheat the operation, the roll-in operation, still heat the pole piece in the roll-in operation, under heating and roll-in effect, the mutual acting force of thickness compensation film and the mass flow piece body of pole piece is strengthened, make the thickness compensation film too inseparable attached on the mass flow piece body, because traditional adhesive is chemisorption, chemisorption usually involves the covalent bond, the formation of the chemical bond of ionic bond, the adsorbate reforms into new material in the surface shape of adsorbate, make produce stronger acting force between adsorbate and the adsorbate, cause the condition that the film is difficult to tear off or the cull. In order to solve the problem of colloid residue generated when the interaction force between the thickness compensation film and the current collecting piece body of the pole piece is too strong under the heating and rolling actions, in one embodiment, the thickness compensation film comprises a main body layer and an anti-residue glue bonding layer, wherein the main body layer and the anti-residue glue bonding layer are sequentially connected in a laminated manner, and the anti-residue glue bonding layer is used for bonding with the single-side coating segment. In this embodiment, the main part layer is the main component part of thickness compensation film, main part layer cascade connection has prevents the cull adhesive linkage, it comprises the silica gel material to prevent the cull adhesive linkage, silica gel has the adsorptivity, and the surface of the mass flow lamellar body of constituteing the pole piece is more smooth, when preventing the cull adhesive linkage that comprises silica gel and attaching on the more smooth mass flow lamellar body in surface, the adsorptivity of silica gel will make and prevent the cull adhesive linkage and closely laminate on the mass flow lamellar body, prevent that the air pressure between cull adhesive linkage and the mass flow lamellar body will diminish, make atmospheric pressure be greater than the air pressure between cull adhesive linkage and the mass flow lamellar body, and then make the thickness compensation film attached on the single face coating segmentation. The residual glue prevention bonding layer achieves the attaching effect through the adsorbability of the silica gel and the air pressure, belongs to the physical adsorption effect, and the physical adsorption is the process of gathering adsorbed objects on the surface of the adsorbed objects with weak acting force, such as Vanderwatt force and electrostatic force.
When the pole piece is rolled, the pole piece is heated, after the traditional thickness compensation film is heated, the molecular activity of the internal structure of the traditional thickness compensation film rises, so that the thickness compensation film is easily rolled and thinned by a rolling shaft under the heating and rolling effects, and the thickness compensation film is difficult to play a thickness compensation effect under the condition that the thickness compensation film is thinned per se, so that the roll pressure degree of the electrode material of the single-side coating section of the pole piece is smaller, and the compactness of the electrode material of the single-side coating section is poor. In order to solve the problem of poor compactness of the single-side coated segmented electrode material caused by the fact that the thickness compensation film is easy to be thinned during heating and rolling, in one embodiment, the main body layer comprises a heating-resistant layering, the heating-resistant layering is sequentially connected with the residual glue sticking layer in a stacking mode, and the thickness of the heating-resistant layering accounts for 80% -90% of the total thickness of the thickness compensation film. In this embodiment, the main component of anti-heating layering thickness compensation film, the anti-heating layering comprises the polyimide material, the internal molecular crosslinking effort of polyimide is stronger, make the structural stability of polyimide better, consequently, the anti-heating layering that has polyamide amine to constitute has good high low temperature resistance performance, thickness compensation film is when heating the roll-in, because polyimide has good structural stability and high temperature resistance performance, and the anti-heating layering is the main component of thickness compensation film, account for 80% -90% of thickness compensation film gross thickness, so when heating the roll-in, the anti-heating layering can keep self shape better, make thickness compensation film exert the effect of thickness compensation better, and then promote the roll pressure degree that the electrode material of the single face coating segmentation of pole piece received.
When the roll-in shaft rolls the thickness compensation film, the roll-in of roll-in shaft will produce the horizontal tensile force to the thickness compensation film, and this tensile force will make the thickness compensation film produce transverse deformation, again because thickness compensation film bonds with the mass collector piece body, the deformation of thickness compensation film will lead to the mass collector piece body to warp, leads to the quality degradation of electric core pole piece. In order to solve the problem of quality reduction of the battery pole piece caused by transverse deformation of the thickness compensation film, in one embodiment, the main body layer further comprises a stretch-resistant layer, and the stretch-resistant layer, the heating-resistant layer and the residual glue prevention bonding layer are sequentially connected in a laminated manner. The anti-stretching layer is composed of a polyetherimide material, the polyetherimide material has good strength and rigidity, the anti-stretching and anti-deformation capabilities are good, the anti-stretching layer serves as the top layer of the thickness compensation film and is directly contacted with the roller press shaft in roll-in processing, the transverse stretching force generated in roll-in processing on the thickness compensation film can be effectively absorbed, the transverse stretching force is prevented from acting on the main body layer of the thickness compensation film, the rigidity of the thickness film is improved, the deformation of the current collecting sheet body caused by the roll-in effect is reduced, and the effect of improving the quality of the battery core pole piece is achieved.
As shown in fig. 2 and 3, in one embodiment, the step of performing a rolling operation on the pole piece semi-finished product specifically includes: and rolling the pole piece semi-finished product by using a pole piece rolling device 10. Further, the pole piece rolling device 10 includes a frame 100, a heating and pressing mechanism 200, and a wheel base adjusting mechanism 300. Heating roller mechanism 200 includes first heating roller 210, second heating roller 220, rotary driving member 300 install in frame 100, first heating roller 210 reaches second heating roller 220 all rotate connect in frame 100, the extending direction of first heating roller 210 with the extending direction of second heating roller 220 is parallel, first heating roller 210 with second heating roller 220 sets up relatively, first heating roller 210 with rotary driving member 300's power take off end is connected, first heating roller 210 with second heating roller 220 is used for the common roll pole piece. The wheel base adjusting mechanism 300 is installed on the rack 100, a power output end of the wheel base adjusting mechanism 300 is connected to the second heating roller shaft 220, and the wheel base adjusting mechanism 300 is used for driving the second heating roller shaft 220 to approach or be far away from the first heating roller shaft 210.
In the present embodiment, the pole piece rolling device 10 includes a frame 100, a heating and pressing mechanism 200, and a wheel base adjusting mechanism 300. The heating pressing mechanism 200 comprises a first heating roller shaft 210, a second heating roller shaft 220 and a rotary driving member 300, wherein the first heating roller shaft 210, the second heating roller shaft 220 and the second heating roller shaft 220 are rotatably connected to the frame 100, the extending direction of the first heating roller shaft 210 is parallel to the extending direction of the second heating roller shaft 220, the rotary driving member 300 is installed on the frame 100, the power output end of the rotary driving member 300 is connected with the first heating roller shaft 210, and the rotary driving member 300 is used for driving the first heating roller shaft 210 to rotate. When the pole pieces are rolled and processed, the cell pole pieces are inserted between the first heating roller shaft 210 and the second heating roller shaft 220, after the rotary driving piece 300 is started, the first heating roller shaft 210 rotates, the first heating roller shaft 210 and the pole pieces generate static friction to drive the pole pieces to move, the pole pieces and the second heating roller shaft 220 generate static friction to drive the second heating roller shaft 220 to rotate, the first heating roller shaft 210 and the second heating roller shaft 220 roll the pole pieces in the rotation process, and the whole thickness of the pole pieces is reduced. The axle distance adjusting mechanism 300 is installed on the rack 100, the axle distance adjusting mechanism 300 is connected with the second heating roller, and the axle distance adjusting mechanism 300 can drive the second heating roller shaft 220 to be close to or far away from the first heating roller shaft 210 so as to change the distance between the second heating roller shaft 220 and the first heating roller shaft 210, so as to process the battery cell pole pieces with different thicknesses, and each battery cell pole piece with different thicknesses can be subjected to proper rolling pressure.
Further, after coating and processing of the battery core pole piece, the battery core pole piece needs to be cooled, after electrode coating on the battery core pole piece is cooled, roll-in processing can be performed, molecular activity of the cooled electrode material is low, and the electrode material has high hardness, so that roll-in processing is performed, the electrode material is difficult to be uniformly compressed, the pressure of the electrode material on a current collector is large, and the extension deformation of the current collector is serious, therefore, in the embodiment, the first heating roller shaft 210 and the second heating roller shaft 220 can generate heat, the rolled battery core pole piece can be heated, the molecular activity of the heated electrode material is increased, a macroscopic state can be represented by the increase of the softness, the electrode material is more easily deformed by roll pressing, the acting force between the electrode material and the current collector is greatly reduced, the deformation caused by roll-in processing can be effectively reduced, or the current collector can be prevented from being subjected to expansion deformation The battery core pole piece is deformed in an extending way, so that the quality of the battery core pole piece is improved; in addition, the heated electrode material is more easily compressed, so that the electrode material can obtain a better compression effect after being rolled for a short time, the time of rolling processing is favorably shortened, and the rolling processing efficiency is improved; in addition, because the looseness and the molecular activity of the heated electrode material are improved, the pressure of the rolling shaft is easier to act on the internal electrode material adjacent to the current collecting sheet body, so that the uniformity of the internal and external compression of the electrode material is better, and further, the active substances in the electrode material are more uniformly and tightly combined with the conductive agent, and the effect of improving the conductive efficiency of the battery core pole piece is achieved.
As shown in fig. 2 and 3, in one embodiment, the frame 100 is provided with two sliding grooves 110, the two sliding grooves 110 are parallel to each other, the wheel base adjusting mechanism 300 includes a connecting block 310, two sliding blocks 320 and a sliding driving member 330, two ends of the connecting block 310 are respectively connected to the two sliding blocks 320, the two sliding blocks 320 are respectively slidably disposed in the two sliding grooves 110, each sliding block 320 is provided with a through hole 321, two ends of the second heating roller 220 are respectively inserted into the through holes 321 of the two sliding blocks 320, the sliding driving member 330 is mounted on the frame 100, and a power output end of the sliding driving member 330 is connected to the connecting block 310. In this embodiment, the wheel base adjusting mechanism 300 is used to adjust the gap between the first heating roller shaft 210 and the second heating roller shaft 220, two ends of the second heating roller shaft 220 respectively penetrate through the through holes 321 formed in the two sliders 320, the two sliders 320 are respectively slidably disposed in the two sliding slots 110 formed in the rack 100, so that the second heating pipe is slidably connected with the rack 100, the two sliders 320 are respectively connected to two ends of the connecting block 310, the connecting block 310 is connected with the sliding driving member 330, when the rolling gap needs to be adjusted, the sliding driving member 330 can be started, and through the transmission between the connecting block 310 and the sliders 320, the second heating roller shaft 220 can be close to or far away from the first heating roller shaft 210, thereby achieving the purpose of adjusting the rolling gap.
As shown in fig. 2 and 3, in one embodiment, the sliding driving member 330 includes a hydraulic cylinder 331 and a hydraulic pump, the hydraulic pump is connected to the hydraulic cylinder 331, the hydraulic cylinder 331 is mounted on the frame 100, and a power output end of the hydraulic cylinder 331 is connected to the connection block 310. In this embodiment, the sliding driving member 330 includes a hydraulic cylinder 331 and a hydraulic pump, the hydraulic cylinder 331 is used to drive the hydraulic cylinder 331, the hydraulic cylinder 331 is installed on the frame 100 and connected to the connecting block 310, the hydraulic cylinder 331 is used to drive the connecting block 310 to move, so as to drive the second heating roller 220 to approach or move away from the first heating roller 210, thereby achieving the effect of adjusting the rolling gap; meanwhile, the driving part formed by the hydraulic cylinder 331 and the hydraulic pump has better driving force and stability, so that the accuracy of adjusting the rolling gap can be improved, the battery cell pole piece can obtain better roller pressure and compactness, and the quality of the battery cell pole piece is improved.
As shown in fig. 2 and 3, in one embodiment, the frame 100 includes a main frame 130 and two guide plates 120, the two guide plates 120 are connected to the main frame 130, and the two guide plates 120 are respectively disposed at two sides of the heating and pressing mechanism 200. In this embodiment, frame 100 includes main frame body 130 and two guide boards 120, heating roller press mechanism 200 and wheel base adjustment mechanism 300 army are connected with main frame body 130 in, two guide boards 120 all are connected with main frame body 130, and two guide boards 120 set up respectively in heating roller press mechanism 200's both sides, guide board 120 is used for lifting the pole piece that is about to be rolled in and accomplishes the pole piece that the roll-in was accomplished, make the completion roll-in processing that the pole piece can be steady, help improving the stability of roll-in process, and then promote the roll-in quality of pole piece.
As shown in fig. 2 and 3, in one embodiment, the two guide plates 120 are horizontally disposed, and the plate surfaces of the two guide plates 120 are in the same plane as the outer edge of the first heating roller 210 adjacent to the second heating roller 220. In this embodiment, because two guide plates 120 all are the level setting, and two the face of guide plate 120 with first heating roller 210 is close to the outer fringe of second heating roller 220 is in the coplanar, can make the pole piece be close to the process of heating rolling mechanism 200, the pole piece by the process of roll-in and the pole piece keep away from the in-process pole piece of heating rolling mechanism 200 and can keep the straight state, so, can make the roll pressure degree that the two sides of pole piece received more unanimous for the two sides of pole piece have unanimous degree of compaction and electrically conductive efficiency.
As shown in fig. 2 and fig. 3, in one embodiment, the pole piece rolling device 10 further includes a baking mechanism 400, the baking mechanism 400 is mounted on the frame 100, and the baking mechanism 400 and the heating and pressing mechanism 200 are sequentially arranged along the conveying direction of the pole piece. In this embodiment, toast mechanism 400 and be used for toasting the heating to the not roll-in electric core pole piece, because electric core pole piece is for carrying out the roll-in, its electrode material's compactness is lower, toasts the heating to it this moment, can the more efficient moisture of locating electric core pole piece, simultaneously, toast the molecular activity promotion of the electrode material after the heating to it is more loose, can be convenient for subsequent roll-in processing, make electrode material faster by the roll-in compaction.
As shown in fig. 2 and fig. 3, in one embodiment, the baking mechanism 400 includes a heating box 410 and a heating element 420, the heating box 410 is provided with a heating cavity 411, a feeding hole 412 and a discharging hole 413, the feeding hole 412 and the discharging hole 413 are both communicated with the heating cavity 411, and the heating element 420 is disposed in the heating cavity 411. In this embodiment, bake mechanism 400 and include heating box 410 and add heat piece 420, heating box 410 has seted up heating cavity 411, feed inlet 412 and discharge gate 413 all communicate with heating cavity 411, the pole piece is through passing feed inlet 412 and getting into in heating cavity 411, add heat piece 420 and set up in heating cavity 411, add heat piece 420 and can give off heat, bake the heating to lieing in heating cavity 411 electric core pole piece, electric core pole piece through baking the heating leaves heating box 410 from discharge gate 413, the heating process before electric core pole piece roll-in has been accomplished promptly.
As shown in fig. 2 and fig. 3, in one embodiment, the heating element 420 includes a first heating set 421 and a second heating set 422, the first heating set 421 and the second heating set 422 are disposed opposite to each other in the heating cavity 411, and the first heating set 421 and the second heating set 422 are used together to heat a pole piece. In this embodiment, the heating element 420 includes a first heating group 421 and a second heating group 422, and the first heating group 421 and the second heating group 422 are relatively disposed in the heating cavity 411, and can heat two faces of the battery cell pole piece in the heating cavity 411 respectively, so that the heating effect on the battery cell pole piece is more uniform and thorough.
As shown in fig. 2 and fig. 3, in one embodiment, the baking mechanism 400 further includes a plurality of conveying rollers 430, the plurality of conveying rollers 430 are disposed in the heating chamber 411, and the plurality of conveying rollers 430 are rotatably connected to the heating box 410, and the plurality of conveying rollers 430 are used for winding and conveying the pole pieces between the feeding opening 412 and the discharging opening 413. In this embodiment, be provided with a plurality of conveying roller 430 in the heating cavity 411, a plurality of conveying roller 430 are used for twining the pole piece that conveys in the heating cavity 411 jointly, so, can increase the heating time of the pole piece of unit area in heating cavity 411 for the pole piece can obtain more abundant heating, the moisture of the reduction pole piece of bigger degree and the looseness that promotes the pole piece.
The application also provides a battery cell pole piece, which is prepared by adopting the battery cell pole piece rolling method in any embodiment. As shown in fig. 1, in one embodiment, the cell pole piece rolling method includes the following steps: providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section; providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection; adhering the thickness compensation film to the lug connecting surface of the single-side coating section to obtain a semi-finished product of the pole piece; carrying out rolling operation on the pole piece semi-finished product; and removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product.
In order to better understand the cell pole piece rolling method of the present invention, the cell pole piece rolling method of the present invention is further explained below, and the cell pole piece rolling method includes the following steps:
s100, providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section. Uniformly mixing the anode rear negative powder with other ingredients to prepare slurry, coating the slurry on a current collecting sheet body, and cooling the slurry on the current collecting sheet body to form the battery cell pole piece in the step.
And S200, providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection. In this step, provide thickness compensation film, the one side of not coating electrode thick liquids is connected the face for utmost point ear in the single face coating segmentation of electric core pole piece, and thickness compensation film's shape and utmost point ear are connected the shape looks adaptation of face, and thickness compensation film is used for attached on utmost point ear is connected the face for the total thickness increase of the single face coating segmentation of thickness compensation film has been bonded.
And S300, adhering the thickness compensation film to the lug connecting surface of the single-side coating section to obtain a semi-finished pole piece. In this step, the thickness compensation film provided in the previous step is adhered to the single-side coating section of the battery cell pole piece, so that the thickness compensation film covers the tab connection surface of the single-side coating section, and further the total thickness of the single-side coating section is increased.
S400, rolling the semi-finished product of the pole piece. The roll squeezer that carries out roll-in processing includes two roll-in axles, two roll-in axle parallel arrangement, and be provided with certain clearance between two roll-in axles, this clearance is the roll-in clearance of electric core pole piece promptly, in inserting into the clearance between two roll-in axles with electric core pole piece, rotate along with two roll-in axles, electric core pole piece will be transported under the frictional force of two roll-in axles, electric core pole piece is being transported the in-process by two roll-in axles roll-in jointly, the electrode coating of electric core will be flattened, make the thickness of electric core pole piece reduce, and then can promote the coiling density of electric core, reach the effect that increases the electric energy reserve volume of battery. In the step, the semi-finished product of the pole piece pasted with the thickness compensation film is rolled, when the single-side coating subsection passes between the two rolling shafts, the two rolling shafts roll the single-side coating subsection pasted with the thickness compensation glue, and the thickness compensation glue increases the total thickness of the single-side coating subsection of the battery cell pole piece, so that the pressing force of the two rolling shafts on the single-side coating subsection is enhanced, the compactness of the electrode coating in the rolled single-side coating subsection is increased, the combination degree of active substances of the electrode coating and conductive agent particles is further improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
And S500, removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product. In the last step, the single-side coating subsection pasted with the thickness compensation glue is rolled by a rolling machine, so that the compactness of the electrode coating in the rolled single-side coating subsection is increased, in the step, the thickness compensation glue on the single-side coating subsection is removed, the lug connecting surface of the battery cell pole piece is exposed again, a pole piece finished product is obtained, and the lug of the battery cell can be in contact connection with the lug connecting surface of the battery cell pole piece.
Further, during the conventional rolling process of the pole piece, since the thicknesses of the single-side coating segment and the double-side coating segment of the pole piece are not consistent, when the rolling device rolls the pole piece, the rolling pressure applied to the single-side coating segment of the pole piece is smaller than that applied to the double-side coating segment, so that the compactness of the electrode coating of the single-side coating segment is low, the combination of active substances in the electrode coating of the single-side coating segment and conductive agent particles is not tight enough, and the reduction of the conductive efficiency of the pole piece is finally caused. In this embodiment, the single-side coating segment of the battery cell pole piece is coated and adhered with the thickness compensation adhesive in a segmented manner, so that the thickness compensation adhesive covers the tab connecting surface of the single-side coating segment, a thickness compensation effect on the single-side coating segment can be achieved, the total thickness of the single-side coating segment of the battery cell pole piece is increased, the pressing force of the single-side coating segment when the single-side coating segment receives the rolling of the rolling wheel is consistent with that of the double-side coating segment, the compactness of the electrode coating of the single-side coating segment is improved, the combination degree of active substances of the electrode coating and conductive agent particles is further improved, and the effect of improving the conductive efficiency of the battery cell pole piece is achieved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method for rolling a battery cell pole piece is characterized by comprising the following steps:
providing a battery cell pole piece, wherein the battery cell pole piece comprises a single-side coating section and a double-side coating section;
providing a thickness compensation film, wherein the shape of the thickness compensation film is matched with the shape of the lug connecting surface of the single-side coating subsection; the thickness compensation film comprises a main body layer and an anti-residual glue bonding layer, wherein the main body layer and the anti-residual glue bonding layer are sequentially connected in a laminated manner, and the anti-residual glue bonding layer is used for bonding with the single-side coating subsection; the main body layer comprises an anti-heating layering, the anti-heating layering is sequentially connected with the residual glue prevention bonding layer in a laminated mode, and the thickness of the anti-heating layering accounts for 80% -90% of the total thickness of the thickness compensation film;
adhering the thickness compensation film to the lug connecting surface of the single-side coating section to obtain a semi-finished product of the pole piece;
preheating the semi-finished product of the pole piece;
carrying out rolling operation on the pole piece semi-finished product;
removing the thickness compensation film on the pole piece semi-finished product to obtain a pole piece finished product; the width of the thickness compensation film is equal to the width of the pole lug connection surface, and the length of the thickness compensation film is smaller than the length of the pole lug connection surface.
2. The cell pole piece rolling method according to claim 1, wherein in the step of performing the rolling operation on the pole piece semi-finished product, the pole piece semi-finished product is kept in a straight state during the rolling process.
3. The cell pole piece rolling method according to claim 1, wherein after the step of providing the cell pole piece and before the step of providing the thickness compensation film, the cell pole piece rolling method further comprises the steps of:
measuring the size of the lug connecting surface of the single-side coating subsection;
setting a rolling gap of the battery cell pole piece;
and manufacturing a thickness compensation film according to the size of the lug connecting surface of the single-side coating section and the rolling gap of the battery cell pole piece.
4. The cell pole piece rolling method according to claim 1, wherein the step of performing rolling operation on the pole piece semi-finished product specifically comprises:
and rolling the semi-finished product of the pole piece for multiple times.
5. The cell pole piece rolling method according to claim 4, wherein the step of performing rolling operation on the pole piece semi-finished product specifically comprises:
and rolling the semi-finished product of the pole piece for multiple times, wherein the rolling gap of the multiple rolling operation is gradually reduced along with the increase of the rolling times.
6. The cell pole piece rolling method according to claim 5, wherein the step of performing rolling operation on the pole piece semi-finished product specifically comprises:
and rolling the semi-finished product of the pole piece for multiple times, wherein the rolling gap of the multiple rolling operations is gradually reduced along with the increase of the rolling times, and the variable quantity of the rolling gap of any two adjacent rolling operations is equal.
7. The cell pole piece rolling method according to claim 4, wherein the pole piece semi-finished product is heated at the same time when the pole piece semi-finished product is rolled each time, and the temperature of the multiple heating is gradually reduced along with the increase of the rolling times.
8. A battery cell pole piece, characterized in that, the battery cell pole piece is prepared by the battery cell pole piece rolling method of any one of claims 1 to 7.
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| CN113619143B (en) * | 2021-10-14 | 2022-01-28 | 三一技术装备有限公司 | Dry method electrode film preparation device and battery production line thereof |
| CN114309063B (en) * | 2021-12-16 | 2024-02-27 | 江苏润孚机械轧辊制造有限公司 | Lithium battery pole piece rolling mill |
| CN114442680B (en) * | 2022-04-07 | 2022-06-10 | 东莞海裕百特智能装备有限公司 | Lithium battery pole piece thickness control method and system and readable storage medium |
| CN115101721B (en) * | 2022-07-29 | 2023-06-02 | 广东利元亨智能装备股份有限公司 | Electrode film forming method and device and pole piece manufacturing method and device |
| CN116914068B (en) * | 2023-09-06 | 2023-11-24 | 常州纳科诺尔精密轧制设备有限公司 | Pole piece hot rolling mechanism and using method thereof |
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| CN106450149A (en) * | 2016-08-31 | 2017-02-22 | 合肥国轩高科动力能源有限公司 | Pole piece processing technology |
| CN208352428U (en) * | 2018-05-28 | 2019-01-08 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece rolling device |
| CN111952546A (en) * | 2020-08-04 | 2020-11-17 | 梅州市量能新能源科技有限公司 | Double-roller continuous rolling device, lithium battery and manufacturing method of positive plate of lithium battery |
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| CN101212039B (en) * | 2006-12-27 | 2010-08-25 | 比亚迪股份有限公司 | Battery pole plate, method for producing the battery pole plate, and pole plate core and secondary battery |
| CN208690417U (en) * | 2018-08-27 | 2019-04-02 | 宁德新能源科技有限公司 | Battery core and electrochemical appliance |
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| CN106450149A (en) * | 2016-08-31 | 2017-02-22 | 合肥国轩高科动力能源有限公司 | Pole piece processing technology |
| CN208352428U (en) * | 2018-05-28 | 2019-01-08 | 东莞塔菲尔新能源科技有限公司 | A kind of pole piece rolling device |
| CN111952546A (en) * | 2020-08-04 | 2020-11-17 | 梅州市量能新能源科技有限公司 | Double-roller continuous rolling device, lithium battery and manufacturing method of positive plate of lithium battery |
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