CN113140806A - Arc-shaped lithium battery and hot-press molding integrated process thereof - Google Patents

Arc-shaped lithium battery and hot-press molding integrated process thereof Download PDF

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Publication number
CN113140806A
CN113140806A CN202110603224.1A CN202110603224A CN113140806A CN 113140806 A CN113140806 A CN 113140806A CN 202110603224 A CN202110603224 A CN 202110603224A CN 113140806 A CN113140806 A CN 113140806A
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Prior art keywords
arc
lithium battery
melt adhesive
hot melt
diaphragm
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CN202110603224.1A
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CN113140806B (en
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刘东凤
刘志伟
李路强
曾贤华
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Huizhou Everpower Technology Co ltd
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Huizhou Everpower Technology Co ltd
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The application provides an arc lithium battery and a hot press molding integrated process thereof. The hot press molding integrated process for the arc-shaped lithium battery comprises the following steps of: manufacturing a positive pole piece, a negative pole piece and a diaphragm; performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with a hot melt adhesive coating layer; winding the positive pole piece, the negative pole piece and the diaphragm with the hot melt adhesive coating layer; welding a positive electrode lug on a positive electrode plate, and welding a negative electrode lug on a negative electrode plate to obtain a lithium battery cell; putting a lithium battery cell into an aluminum-plastic sleeve to obtain a lithium battery to be formed; carrying out hot-press molding operation on the lithium battery to be formed to obtain an arc-shaped lithium battery to be packaged; and carrying out packaging operation on the arc-shaped lithium battery to be packaged to obtain the arc-shaped lithium battery. By adopting the hot press molding integrated process, the radian of the arc-shaped lithium battery is more stable, and the surface of the arc-shaped lithium battery is smoother.

Description

Arc-shaped lithium battery and hot-press molding integrated process thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an arc-shaped lithium battery and a hot press molding integrated process thereof.
Background
Lithium ions have been widely used in portable electronic products in large quantities because of their advantages of high energy density, high operating voltage, long cycle life, environmental protection, safety, etc. In recent years, portable electronic devices have become smaller and smaller, and demands for wearing comfort and cruising ability have become higher and higher. Particularly, for an electronic device worn on the body, the fit and size miniaturization of the electronic device when worn require a battery for supplying power thereto to have a smaller size and weight, and also require a higher space adaptability.
Because the battery is directly put into the electronic device for use, the space reserved for the battery in the electronic device directly determines the cruising ability of the electronic device. However, if the battery is reserved for a lot of space to increase the endurance, the other electronic components inside the electronic device are irregularly positioned. In actual use, the idle space in the electronic device is more, and the traditional battery only can use the cubic space, so that the utilization efficiency of the space is greatly reduced. In order to make the arrangement of various types of electronic components inside an electronic device more compact so as to more effectively utilize the space inside the electronic device, various types of shaped secondary batteries including arc-shaped batteries have been used. The flat battery is prepared according to the traditional process, after the formation of the flat battery is finished, the flat battery is placed between an upper arc clamp and a lower arc clamp, preset pressure is applied to the battery within a certain temperature and time period, and the originally horizontal upper surface and the lower surface of the battery are pressed into an arc shape to obtain the arc-shaped battery.
However, the arc-shaped battery has the following obvious disadvantages in the preparation process: after the battery is formed, an arc pressing machine is adopted to directly bend the formed flat battery into an arc shape, although the process is simple, the appearance of the battery is wrinkled, and the surface smoothness of the battery is poor; and because the arc of battery is once bent and formed, the radian is very unstable, and the radian change will be great in circulation and storage process.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an arc-shaped lithium battery with stable radian and smooth surface and a hot press molding integrated process thereof.
The purpose of the invention is realized by the following technical scheme:
an arc lithium battery hot press molding integrated process comprises the following steps:
manufacturing a positive pole piece, a negative pole piece and a diaphragm;
performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with a hot melt adhesive coating layer;
winding the positive pole piece, the negative pole piece and the diaphragm with the hot melt adhesive coating layer;
welding a positive electrode lug on the positive electrode plate, and welding a negative electrode lug on the negative electrode plate to obtain a lithium battery cell;
putting the lithium battery cell into an aluminum-plastic sleeve to obtain a lithium battery to be formed;
carrying out hot press molding operation on the lithium battery to be formed to obtain an arc-shaped lithium battery to be packaged;
and carrying out packaging operation on the arc-shaped lithium battery to be packaged to obtain the arc-shaped lithium battery.
In one embodiment, the melting point of the hot melt adhesive is less than the melting point of the membrane.
In one embodiment, the melting point of the hot melt adhesive is 100 ℃ to 120 ℃.
In one embodiment, after the steps of manufacturing the positive electrode plate, the negative electrode plate and the separator, before the step of performing a hot melt adhesive coating operation on the surface of the separator to obtain the separator with the hot melt adhesive coating layer, the method further comprises the following steps:
and heating the hot melt adhesive.
In one embodiment, the hot melt adhesive comprises at least one of polyamide, polyester, polyethylene, and polyesteramide.
In one embodiment, after the step of placing the lithium battery cell into an aluminum plastic sleeve to obtain a lithium battery to be formed, before the step of performing a hot press molding operation on the lithium battery to be formed to obtain an arc-shaped lithium battery to be packaged, the method further includes the following steps:
and preheating the lithium battery to be formed.
In one embodiment, the preheating temperature is 100-120 ℃.
In one embodiment, the encapsulating operation specifically includes the following steps:
packaging the top edge of the aluminum-plastic sleeve;
respectively packaging two side edges of the aluminum-plastic sleeve, and reserving a liquid injection port on one side edge of the aluminum-plastic sleeve;
sequentially carrying out liquid injection operation, formation operation and degassing operation on the arc-shaped lithium battery to be packaged through the liquid injection port;
and sealing the liquid injection port.
In one embodiment, the step of performing the hot melt adhesive coating operation on the surface of the membrane specifically comprises: and spraying hot melt adhesive on the surface of the diaphragm.
An arc lithium battery is prepared by adopting the hot press molding integrated process of the arc lithium battery in any embodiment.
Compared with the prior art, the invention has at least the following advantages:
1. according to the arc lithium battery hot press molding integrated process, the hot melt adhesive coating operation is carried out on the surface of the diaphragm, so that the hot melt adhesive coating layer is formed on the surface of the diaphragm, and the hot melt adhesive has good adhesive property, so that the diaphragm is more tightly and firmly adhered to the positive and negative pole pieces. So, after positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating and convolute, can make lithium cell electric core's structure more stable.
2. After the winding operation is completed, the positive electrode tab is welded on the positive electrode plate, and the negative electrode tab is welded on the negative electrode plate, so that the lithium battery cell is obtained. Then put into the aluminium-plastic cover with lithium cell electricity core, obtain the lithium cell of waiting to take shape to the lithium cell of waiting to take shape carries out hot briquetting integration operation, can be with lithium cell electricity core and aluminium-plastic cover integration through hot briquetting integration on the one hand, and on the other hand can be with the arc lithium cell of waiting to take shape the lithium cell bending to predetermineeing the curvature. Compared with the traditional manufacturing method of the arc-shaped lithium battery, the manufacturing method of the arc-shaped lithium battery can realize hot press molding integration, thereby simplifying the manufacturing process of the arc-shaped lithium battery and improving the manufacturing efficiency. In addition, after the hot press forming integrated operation is completed, the surface temperature of the arc lithium battery is reduced, and the hot melt adhesive coated on the surface of the diaphragm is cured and formed again, so that the radian of the arc lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur.
3. In the hot-press forming process, the hot melt adhesive coated on the diaphragm is melted again, and the melted hot melt adhesive can flow in the aluminum plastic sleeve, so that a gap between aluminum plastic and the diaphragm is compensated when the lithium battery is subjected to arc forming, wrinkles generated on the surface of a bent part of the arc lithium battery in the hot-press process can be effectively repaired, the surface of the arc lithium battery is smoother, and the performance of the arc lithium battery is favorably improved.
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 flow chart of an integrated thermal press molding process for an arc-shaped lithium battery in an embodiment;
fig. 2 is a schematic structural diagram of an arc-shaped battery cell in an embodiment;
fig. 3 is a schematic cross-sectional view of the arc-shaped cell structure shown in fig. 2;
fig. 4 is a partially enlarged schematic view of the arc-shaped cell structure shown in fig. 2;
fig. 5 is a schematic structural diagram of an arc-shaped lithium battery including the arc-shaped battery cell 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.
The application provides an arc lithium battery hot press molding integrated process. The hot press molding integrated process for the arc-shaped lithium battery comprises the following steps: manufacturing a positive pole piece, a negative pole piece and a diaphragm; performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with a hot melt adhesive coating layer; winding the positive pole piece, the negative pole piece and the diaphragm with the hot melt adhesive coating layer; welding a positive electrode lug on the positive electrode plate, and welding a negative electrode lug on the negative electrode plate to obtain a lithium battery cell; putting the lithium battery cell into an aluminum-plastic sleeve to obtain a lithium battery to be formed; carrying out hot press molding operation on the lithium battery to be formed to obtain an arc-shaped lithium battery to be packaged; and carrying out packaging operation on the arc-shaped lithium battery to be packaged to obtain the arc-shaped lithium battery.
According to the arc lithium battery hot press molding integrated process, the hot melt adhesive coating operation is carried out on the surface of the diaphragm, so that the hot melt adhesive coating layer is formed on the surface of the diaphragm, and the hot melt adhesive has good adhesive property, so that the diaphragm is more tightly and firmly bonded with the positive and negative pole pieces. So, after positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating and convolute, can make lithium cell electric core's structure more stable. Further, after the winding operation is completed, welding a positive electrode tab to the positive electrode sheet, and welding a negative electrode tab to the negative electrode sheet to obtain the lithium battery cell. Then put into the aluminium-plastic cover with lithium cell electricity core, obtain the lithium cell of waiting to take shape to the lithium cell of waiting to take shape carries out hot briquetting integration operation, can be with lithium cell electricity core and aluminium-plastic cover integration through hot briquetting integration on the one hand, and on the other hand can be with the arc lithium cell of waiting to take shape the lithium cell bending to predetermineeing the curvature. Compared with the traditional manufacturing method of the arc-shaped lithium battery, the manufacturing method of the arc-shaped lithium battery can realize hot press molding integration, thereby simplifying the manufacturing process of the arc-shaped lithium battery and improving the manufacturing efficiency. In addition, after the hot press forming integrated operation is completed, the surface temperature of the arc lithium battery is reduced, and the hot melt adhesive coated on the surface of the diaphragm is cured and formed again, so that the radian of the arc lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur. Furthermore, this application is in the hot briquetting in-process, coat in the hot melt adhesive of diaphragm and melt once more, and the hot melt adhesive after melting can flow in the plastic-aluminum cover to compensate the gap that produces between plastic-aluminum and the diaphragm when the arc shaping to the lithium cell, and then can repair the hot pressing in-process effectively, especially the arc lithium cell buckles that the department surface produced of bending, makes the surface of arc lithium cell level more, is favorable to promoting the performance of arc lithium cell.
In order to better understand the hot press molding integrated process of the arc-shaped lithium battery, the hot press molding integrated process of the arc-shaped lithium battery is further explained as follows:
as shown in fig. 1, the hot press molding integrated process of the arc-shaped lithium battery of an embodiment includes some or all of the following steps:
s100, manufacturing a positive pole piece, a negative pole piece and a diaphragm.
In this embodiment, the manufacturing process of the positive electrode plate is as follows: preparing anode inner layer slurry and anode outer layer slurry, wherein the anode inner layer slurry comprises an anode inner layer active material, the anode outer layer slurry comprises an anode outer layer active material, and the stability of the anode inner layer active material is superior to that of the anode outer layer active material; the active material of the inner layer of the positive electrode comprises one or more of lithium iron phosphate, lithium cobaltate, a nickel-cobalt-manganese ternary material, a nickel-cobalt-aluminum high-nickel material and lithium titanate, and the active material of the outer layer of the positive electrode comprises one or more of lithium iron phosphate, lithium cobaltate, a nickel-cobalt-manganese ternary material, a nickel-cobalt-aluminum high-nickel material and lithium titanate; and coating the positive inner layer slurry and the positive outer layer slurry on a battery positive carrier to obtain the lithium battery positive pole piece. The preparation process of the negative pole piece comprises the following steps: preparing cathode inner layer slurry and cathode outer layer slurry, wherein the cathode inner layer slurry comprises a cathode inner layer active material, the cathode outer layer slurry comprises a cathode outer layer active material, and the stability of the cathode inner layer active material is superior to that of the cathode outer layer active material; the active material of the inner layer of the negative electrode comprises one or more of natural graphite, artificial graphite, a composite material of the natural graphite and the artificial graphite, soft carbon, hard carbon and lithium titanate, and the active material of the outer layer of the negative electrode comprises one or more of the natural graphite, the artificial graphite, the composite material of the natural graphite and the artificial graphite, the soft carbon, the hard carbon and the lithium titanate; and coating the negative inner layer slurry and the negative outer layer slurry on a battery negative carrier to obtain the negative pole piece of the lithium battery. The diaphragm in the embodiment is prepared by adopting a dry diaphragm preparation process.
And S200, performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with the hot melt adhesive coating layer.
In this embodiment, a coating device is used to coat the hot melt adhesive on the surfaces of the two side surfaces of the membrane, so that the membrane is coated with the hot melt adhesive to form the membrane with the hot melt adhesive coating layer. The hot melt adhesive has better adhesive property, so that the diaphragm is more tightly and firmly adhered to the positive and negative pole pieces. So, after positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating and convolute, can make lithium cell electric core's structure more stable.
S300, winding the positive pole piece, the negative pole piece and the diaphragm with the hot melt adhesive coating layer.
In this embodiment, a winding operation is performed on the positive electrode plate, the negative electrode plate, and the separator having the hot melt adhesive coating layer, wherein the separator having the hot melt adhesive coating layer is located between the positive electrode plate and the negative electrode plate. Further, the step of winding the positive electrode plate, the negative electrode plate and the diaphragm with the hot melt adhesive coating layer specifically comprises the following steps: adopt the arc tape measure to carry out vertical coiling to positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating, the arc tape measure includes the fixed part of being connected with the coiling equipment and the winding part that is used for fixed positive pole piece, negative pole piece, diaphragm, is equipped with rectangular shape breach in the middle of the winding part and will convolute the part two halves in pairs, and one side of winding part is the plane, and the opposite side is the arcwall face, the calculation of arcwall face: the width F of the arc measuring tape is equal to B-D, and the arc length H of the arc measuring tape is equal to F-E; wherein, arc length is B in the arc battery, and the winding number of piles of arc battery is C, and the thickness of arc battery is D, and the central angle radius of arc battery is R, carries out N partition to the thickness D of arc battery earlier, and N is (C-2), and the arc length difference of every equal partition is E.
And S400, welding the positive electrode lug on the positive electrode plate, and welding the negative electrode lug on the negative electrode plate to obtain the lithium battery cell.
In this embodiment, after the winding operation is completed, the empty foil spot welding position of the tab with the size of 3mm to 5mm is reserved, and then the tab welding device is used for welding the anode tab at the welding point of the anode tab and the cathode tab at the welding point of the cathode tab, so that the lithium battery cell is obtained.
And S500, placing the lithium battery cell into an aluminum-plastic sleeve to obtain the lithium battery to be formed.
In this embodiment, put into the aluminium-plastic cover with lithium cell electricity core and carry out the pre-encapsulation, specifically, the aluminium-plastic cover includes epitheca and inferior valve, utilizes to dash box mould punching press out epitheca and inferior valve that has the recess that corresponds with lithium cell electricity core shape, and the epitheca links into an integrated entity with the one end of inferior valve. Put into the recess of inferior valve with lithium cell electricity core, then turn over the epitheca and turn over a cooperation with the inferior valve, utilize the encapsulation head to carry out the pressfitting at epitheca and inferior valve edge, make the plastic-aluminum membrane compress tightly lithium cell electricity core, obtain the lithium cell of waiting to take shape to follow-up lithium cell of waiting to take shape carries out thermoforming integrated operation.
S600, carrying out hot press molding operation on the lithium battery to be formed to obtain the arc-shaped lithium battery to be packaged.
It can be understood that the lithium battery cell is obtained by welding the positive electrode tab to the positive electrode sheet and welding the negative electrode tab to the negative electrode sheet. And then, putting the lithium battery cell into an aluminum-plastic sleeve to obtain the lithium battery to be formed, wherein the lithium battery to be formed is favorable for hot press forming. In this embodiment, treat the lithium cell that takes shape and carry out hot briquetting integration operation, can be with lithium cell electricity core and plastic-aluminum cover integration through hot briquetting integration on the one hand, on the other hand can be with the lithium cell that takes shape the arc lithium cell of bending to predetermineeing the curvature. Compared with the traditional manufacturing method of the arc-shaped lithium battery, the embodiment can realize hot press molding integration, thereby simplifying the manufacturing process of the arc-shaped lithium battery and improving the manufacturing efficiency. In addition, after the hot press forming integrated operation is completed, the surface temperature of the arc lithium battery is reduced, and the hot melt adhesive coated on the surface of the diaphragm is cured and formed again, so that the radian of the arc lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur. In addition, at the hot briquetting in-process, coat in the hot melt adhesive of diaphragm and melt once more, the hot melt adhesive after melting can flow in the plastic-aluminum cover to compensate the gap that produces between plastic-aluminum and the diaphragm when the arc shaping to the lithium cell, and then can repair the hot pressing in-process effectively, especially the arc lithium cell buckles that the department surface produced of bending, makes the surface of arc lithium cell more level and more smooth, is favorable to promoting the performance of arc lithium cell.
S700, carrying out packaging operation on the arc-shaped lithium battery to be packaged to obtain the arc-shaped lithium battery.
It can be understood that after the lithium battery to be formed is subjected to the hot press forming integrated operation, the arc-shaped lithium battery to be packaged with a certain radian is obtained. In order to improve the protection effect of the aluminum plastic film on the arc lithium battery cell, in this embodiment, the arc lithium battery to be packaged is packaged, so that the packaging effect of the aluminum plastic film on the arc lithium battery cell is effectively improved, the protection effect of the aluminum plastic film on the arc lithium battery cell is improved, and the safety and the service life of the arc lithium battery are improved.
In one embodiment, the melting point of the hot melt adhesive is less than the melting point of the membrane. It is understood that the hot melt adhesive is applied to the surface of the separator to form a hot melt adhesive coating layer on the surface of the separator. When waiting to take shape lithium cell when carrying out hot briquetting operation, coat in the hot melt adhesive on diaphragm surface and reach the melting point gradually and begin to melt, the hot melt adhesive after melting can flow in the plastic-aluminum cover to the gap that produces between plastic-aluminum and the diaphragm when the arc shaping to the lithium cell compensates, and then can repair the hot pressing in-process effectively, the crease that the surface produced is bent to especially arc lithium cell, make the surface of arc lithium cell more level and more smooth, be favorable to promoting the performance of arc lithium cell. However, if the melting point of the hot melt adhesive is too high, the hot melt adhesive is difficult to melt in the hot pressing process, and the compensation and repair effect on the surface of the arc lithium battery cannot be achieved. And the melting point of the hot melt adhesive is higher, so that the membrane is easily damaged in the melting process. In this embodiment, the melting point of the hot melt adhesive is less than the melting point of the membrane, so that the hot melt adhesive is easier to melt in the hot pressing process, and in the melting process, the membrane is not damaged due to overheating, and the membrane is protected.
Furthermore, the melting point of the hot melt adhesive is 100-120 ℃. In this embodiment, the melting point of lithium cell diaphragm is 160 ℃, and the melting point of hot melt adhesive is less than the melting point of diaphragm, when treating the lithium cell that takes shape and carrying out hot briquetting operation, can make the hot melt adhesive reach better molten state to it is better to make the mobility of hot melt adhesive, can flow to the inside corner gap of lithium cell better, plays better compensation restoration effect to the surface of arc lithium cell in the hot briquetting in-process, prevents the appearance of fold, makes the surface of arc lithium cell level and smooth more. Meanwhile, the hot melt adhesive can not damage the diaphragm due to overheating in the melting process, and the protection performance of the diaphragm is further improved.
In one embodiment, the temperature in the thermoforming operation is from 130 ℃ to 150 ℃. In this embodiment, treat that shaping lithium cell thermoforming's temperature is greater than the melting point of hot melt adhesive, and is less than the melting point of lithium cell diaphragm, can make coat in the hot melt adhesive on diaphragm surface fully melt, and can not cause the damage to lithium cell diaphragm to make the hot melt adhesive play better compensation repair effect to the surface of arc lithium cell better, guarantee the performance of arc lithium cell simultaneously.
Further, the pressure in the hot press molding operation is 0.4MPa to 0.8 MPa. It can be understood that, in the hot-press molding operation, the hot-press molding integration of the arc-shaped lithium battery is realized by applying certain temperature and pressure to the lithium battery to be molded. However, if the pressure in the hot press molding process is too high, the arc lithium battery is easily damaged; if the pressure in the hot press molding process is too low, the arc-shaped lithium battery is easily unable to be bent to a predetermined curvature. In the embodiment, in the hot press molding operation, a hot press end socket is adopted to apply a pressure of 0.6MPa to the lithium battery to be molded, and meanwhile, the temperature of the hot press end socket is 140 ℃, so that the hot melt adhesive is in a molten state in the hot press process, on one hand, a better compensation and repair effect can be achieved on the surface of the arc lithium battery in the hot press process, and the arc lithium battery can reach a preset curvature and has better surface flatness; on the other hand, the forming effect of the arc-shaped lithium battery is better through the combination of pressure and temperature.
Further, the hot press time in the hot press molding operation is 4 to 7 seconds. In this embodiment, by controlling the hot-pressing time in the hot-pressing operation, the hot-pressing time is 5 seconds, the temperature is 140 ℃, and the pressure is 0.6MPa, so that the arc lithium battery obtained in the hot-pressing operation has a higher forming rate and a better forming effect.
In one embodiment, after the steps of manufacturing the positive electrode plate, the negative electrode plate and the diaphragm, before the step of performing a hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with a hot melt adhesive coating layer, the method further comprises the following steps: and heating the hot melt adhesive. It can be understood that the hot melt adhesive is coated on the surface of the diaphragm, so that the shaping effect of the arc-shaped lithium battery after hot press forming is facilitated, the better compensation and repair effect is achieved on the surface of the arc-shaped lithium battery in the hot press process, and the smoothness of the surface of the arc-shaped lithium battery is further improved. However, the hot melt adhesive is prone to have problems of difficult coating and poor coating uniformity in the coating process of the separator. In order to improve the coating uniformity of the hot melt adhesive on the diaphragm and simultaneously make the coating more convenient, in the embodiment, after the steps of manufacturing the anode pole piece, the cathode pole piece and the diaphragm, the hot melt adhesive coating operation is carried out on the surface of the diaphragm, and before the step of obtaining the diaphragm with the hot melt adhesive coating layer, the hot melt adhesive is heated, so that the hot melt adhesive is in a semi-molten state, the hot melt adhesive is easier to coat, the coating is difficult to drop after the coating is carried out on the diaphragm, and the coating uniformity on the diaphragm is better.
In one embodiment, the hot melt adhesive comprises at least one of polyamide, polyester, polyethylene, and polyesteramide. It can be understood that, hot melt adhesive coating in the surface of diaphragm, at the hot briquetting in-process, coating in the hot melt adhesive of diaphragm melts once more, and the hot melt adhesive after melting can flow in the plastic-aluminum cover to compensate the gap that produces between plastic-aluminum and the diaphragm when the arc shaping to the lithium cell, and then can repair the hot pressing in-process effectively, especially the arc lithium cell buckles that the department surface produced of bending, makes the surface of arc lithium cell more level and more smooth. After the hot press forming integrated operation is completed, the surface temperature of the arc-shaped lithium battery is reduced, and the hot melt adhesive coated on the surface of the diaphragm is cured and formed again, so that the radian of the arc-shaped lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur. However, some hot melt adhesives cannot be well matched with the hot press molding conditions of the arc-shaped lithium battery, and the problems of high melting point and poor hardness after cooling exist, so that the shaping effect and the stability of the arc-shaped lithium battery are influenced. In order to improve the shaping effect and stability of the arc-shaped lithium battery, in this embodiment, the hot melt adhesive includes at least one of polyamide, polyester, polyethylene, and polyester amide, the melting points of the polyamide, polyester, polyethylene, and polyester amide are all 105 ℃ to 115 ℃, and are less than the melting point of the diaphragm, after the hot press molding operation is completed, the surface of the arc-shaped lithium battery is restored to room temperature, and the room temperature is far less than the melting points of the polyamide, polyester, polyethylene, and polyester amide, so that the arc of the arc-shaped lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur. And the hardness of the polyamide, the polyester, the polyethylene and the polyesteramide is higher, and the cooled polyamide, the polyester, the polyethylene and the polyesteramide are favorable for improving the shaping effect and the stability of the arc-shaped lithium battery.
Further, the polyamide has light weight, excellent crease resistance, good durability, corrosion resistance and heat setting, when the polyamide is coated on the diaphragm, the hot press forming effect of the arc-shaped lithium battery is favorably improved, and the surface of the hot melt adhesive after hot pressing has better crease resistance, so that the structural stability and the electrical property of the arc-shaped lithium battery are favorably improved. Polyester, by the polymer sum of polycondensation of polyol and polybasic acid, in this embodiment, polyester is polyethylene terephthalate, and crystallization rate is very fast when the polyethylene terephthalate fuse-element cools off, is favorable to improving the accuracy and the design efficiency of arc lithium cell design radian, and simultaneously polyethylene terephthalate's quality is light, and mechanical strength is great, is difficult for breaking after the shaping, and stability is high. The polyethylene has good chemical stability, can resist most of acid and alkali erosion, has better corrosion resistance to the electrolyte of the arc lithium battery, has better electrical insulation property, and is beneficial to improving the insulation effect of the diaphragm.
In one embodiment, after the step of placing the lithium battery cell into the aluminum plastic sleeve to obtain the lithium battery to be formed, before the step of performing hot press molding operation on the lithium battery to be formed to obtain the arc-shaped lithium battery to be packaged, the method further includes the following steps: and preheating the lithium battery to be formed. It can be understood that, in the present application, after the winding operation is completed, the positive electrode tab is welded to the positive electrode sheet, and the negative electrode tab is welded to the negative electrode sheet, so as to obtain the lithium battery cell. Then put into the aluminium-plastic cover with lithium cell electricity core, obtain the lithium cell of waiting to take shape to the lithium cell of waiting to take shape carries out hot briquetting integration operation, can be with lithium cell electricity core and aluminium-plastic cover integration through hot briquetting integration on the one hand, and on the other hand can be with the arc lithium cell of waiting to take shape the lithium cell bending to predetermineeing the curvature. However, in the hot press molding process, due to the aluminum plastic film between the hot melt adhesive and the hot press end socket, the heat conduction speed of the hot melt adhesive is low, so that the hot melt adhesive is heated unevenly, and the hot press molding of the arc-shaped lithium battery is influenced. In this embodiment, after the step of placing the lithium battery core into the aluminum-plastic sheath to obtain the lithium battery to be formed, before the step of performing a hot press molding operation on the lithium battery to be formed to obtain the arc-shaped lithium battery to be packaged, the method further includes the following steps: treat the lithium cell that takes shape and preheat the operation, the hot melt adhesive coating on operation messenger diaphragm surface through preheating reaches half molten state in advance, then carry out the hot briquetting operation again, thereby improve the heat conduction speed of hot melt adhesive during hot pressing, it is more even to make being heated of hot melt adhesive, thereby be favorable to the hot briquetting of arc lithium cell, make the hot melt adhesive more comprehensively extend to each corner inside the lithium cell simultaneously, and then can restore the hot pressing in-process more effectively, especially the fold that the surface produced is bent to the arc lithium cell, make the surface of arc lithium cell more level and more smooth, be favorable to promoting the performance of arc lithium cell.
Further, the preheating temperature in the preheating operation is 100 ℃ to 120 ℃. It can be understood that the hot melt adhesive coating on the surface of the diaphragm is pre-heated to reach a semi-molten state, and then hot press molding is carried out, so that the heat conduction speed of hot melt adhesive during hot pressing is improved, the hot melt adhesive is heated more uniformly, and the hot press molding of the arc-shaped lithium battery is facilitated. In order to make the hot melt adhesive layer reach more even and stable molten state, prevent simultaneously that it causes the damage to the diaphragm to preheat the in-process, in this embodiment, preheat the preheating temperature in the operation and be 130 ℃, the hot melt adhesive is close the melting point under this temperature, make the hot melt adhesive layer reach more even and stable molten state, thereby make the hot melt adhesive can extend to each inside corner of lithium cell more comprehensively, and then can restore the hot pressing in-process more effectively, especially the arc lithium cell buckles that the department surface produced of bending, make the surface of arc lithium cell more level and more smooth, be favorable to promoting the performance of arc lithium cell. Furthermore, the melting point of the diaphragm is 160 ℃, and the melting point of the hot melt adhesive is less than that of the diaphragm, so that the damage to the diaphragm in the preheating process can be effectively prevented, and the safety of the arc-shaped lithium battery is further improved.
Further, the preheating operation is specifically a hot air blowing operation performed on the inside of the aluminum plastic sleeve. It will be appreciated that prior to the thermoforming integration operation, the lithium battery cells are placed within an aluminum plastic casing, including a separator coated with a layer of hot melt adhesive. In this embodiment, adopt the air-blower to treat and blow the hot-blast operation in the plastic-aluminum cover of shaping lithium cell, the problem that the heat conduction that the thermal-insulated effect of plastic-aluminum cover brought is slow and the heat conduction is uneven is solved, make the hot melt adhesive reach half molten state to molten state before hot briquetting integration operation, then carry out the hot briquetting operation again, thereby the heat conduction speed of hot melt adhesive when improving the hot pressing, it is more even to make being heated of hot melt adhesive, thereby be favorable to the hot briquetting of arc lithium cell, make the hot melt adhesive extend to each inside corner of lithium cell more comprehensively simultaneously, and then can restore the hot pressing in-process more effectively, especially the fold that the surface produced is bent to the arc lithium cell, make the surface of arc lithium cell more level and more, be favorable to promoting the performance of arc lithium cell. Meanwhile, the hot melt adhesive can permeate into the tab, so that the electrical performance of the arc-shaped lithium battery is improved, and the sealing performance of the arc-shaped lithium battery during subsequent packaging is facilitated. In one embodiment, the air supply direction in the hot air blowing operation makes 360-degree rotation movement relative to the opening of the aluminum plastic sleeve. It can be understood that before the hot-press forming integrated operation is carried out on the lithium battery to be formed, the air blower is adopted to blow hot air in the aluminum plastic sleeve of the lithium battery to be formed, so that the problems of slow heat conduction and uneven heat conduction caused by the heat insulation effect of the aluminum plastic sleeve can be solved, and the hot melt adhesive can reach a semi-molten state to a molten state before the hot-press forming integrated operation. However, in the hot air blowing process, because the air supply direction is too concentrated, the hot air is likely to heat the hot melt adhesive unevenly, so that the melting state of the hot melt adhesive is affected and the preheating rate is likely to be affected. In this embodiment, adjust the mouth of blowing of air-blower through control, make the air supply direction in the hot-blast operation be 360 degrees rotary motion for the opening of plastic-aluminum cover to make hot-blast opening through the plastic-aluminum cover evenly blow to the hot melt adhesive in the plastic-aluminum cover, make hot-blast heating to the hot melt adhesive more even, and then make the hot melt adhesive reach semi-molten state to molten state sooner, more be favorable to the hot pressing effect of arc lithium cell.
Further, the rotation rate of the hot air in the air supply direction is 12 to 20 revolutions per minute, in this embodiment, when the hot air blowing operation is performed, the air outlet of the air supply device is controlled and adjusted, so that the rotation rate of the hot air in the air supply direction is 12 to 20 revolutions per minute, and therefore the hot air heats the hot melt adhesive more uniformly, the hot melt adhesive reaches a semi-molten state to a molten state more quickly, and the hot pressing effect of the arc-shaped lithium battery is more facilitated. Meanwhile, the problem that the hot air is blown at an air supply angle for too long time to cause local overheating in the aluminum plastic sleeve is avoided, and the safety of preheating operation is further improved.
Furthermore, the included angle between the air supply direction and the hot melt adhesive coating layer is 30-60 degrees. In this embodiment, the contained angle between hot-blast air supply direction and the hot melt adhesive coating in the operation of preheating is 30 degrees ~ 60 degrees, increases the area of contact between hot-blast and the hot melt adhesive coating effectively to reach better preheating effect, be favorable to the hot briquetting of arc lithium cell. Meanwhile, the hot air can directly impact the hot melt adhesive coating layer, so that the smoothness of the hot melt adhesive coating layer in the preheating process is good.
In one embodiment, the direction of the positive and negative electrode tabs coincides with the winding direction. In this embodiment, adopt utmost point ear welding direction parallel with the electrode slice, increase the pliability after the lithium cell forms, be convenient for carry out bending forming to the battery and mould etc. and anodal utmost point ear and negative pole utmost point ear's direction is unanimous with the direction of coiling, and the direction of coiling is parallel with the arc direction of shaping, has prevented that inside atress is even and the electric core inner structure that produces when electric core carries out the arc and moulds from damaging, prevents pole piece short circuit or the scheduling problem that opens circuit.
In one embodiment, the packaging operation specifically includes the following steps:
and S710, packaging the top edge of the aluminum plastic sleeve.
In this embodiment, the top sealing operation is performed from the top side by using the lithium battery packaging device, so that partial packaging of the arc-shaped lithium battery is completed, and the subsequent side sealing operation is facilitated.
S720, respectively packaging the two side edges of the aluminum-plastic sleeve, and reserving a liquid injection port on one side edge of the aluminum-plastic sleeve.
In this embodiment, adopt the encapsulation head to encapsulate the both sides limit of plastic-aluminum cover respectively to further encapsulate the arc lithium cell, make the encapsulation leakproofness of plastic-aluminum cover better, and reserve one side and for annotating the liquid mouth, make things convenient for follow-up in pouring into the arc lithium cell of waiting to encapsulate with electrolyte.
And S730, sequentially carrying out liquid injection operation, formation operation and degassing operation on the arc lithium battery to be packaged through the liquid injection port.
In this embodiment, adopt notes liquid machine to annotate the liquid operation from annotating the liquid mouth, annotate the liquid and accomplish the back, adopt to become the device and treat the encapsulation lithium cell and become the operation, then carry out the degasification operation again to be favorable to the follow-up operation of sealing, prevent that the inside gas that produces of lithium cell from causing harmful effects to the performance of lithium cell.
And S740, after the degassing operation is finished, sealing the liquid injection port.
In this embodiment, treat that the encapsulation lithium cell will treat that the inside air of encapsulation lithium cell is all discharged after the degasification operation, makes and treats that the encapsulation lithium cell is inside to keep vacuum, then seals the operation to annotating the liquid mouth to can improve lithium cell encapsulation's leakproofness effectively, and then improve the electrical property of lithium cell. Further, after sealing the liquid injection mouth of reserving, carry out the hem to reserving the limit again, make at last the unilateral packaging mode that adopts the side seal direction carries out the extranal packing encapsulation, can save 0.5 mm's space in battery width direction, promotes the volume energy density of battery in the edge formation first hem of arc plastic-aluminum membrane 5, the second hem of being connected with first hem and the third hem of being connected with the second hem.
In one embodiment, the step of performing the hot melt adhesive coating operation on the surface of the separator specifically comprises: and spraying hot melt adhesive on the surface of the diaphragm. It can be understood that the hot melt adhesive is coated on the surface of the diaphragm, and after the hot press molding is integrated, the hot melt adhesive is melted and then permeates into the tab, so that the tab is not easy to rebound after being pressed, and wrinkles in the hot press process can be repaired. However, the corners of the diaphragm are difficult to coat, and the problem of missing coating is easy to occur, so that the compensation and repair effect of the hot melt adhesive on the arc lithium battery is influenced. In this embodiment, the hot melt adhesive coating operation adopts the spraying mode, can coat the hot melt adhesive more comprehensively on the diaphragm, prevents the phenomenon that the diaphragm corner from leaking to be scribbled, and further, the hot melt adhesive spraying still can carry out the operation of hot briquetting integration after in the diaphragm to carry out the hot pressing with the uneven hot melt adhesive of coating that the spraying probably leads to, make the hot melt adhesive layer level and more smooth, and can play the compensation repair effect better.
Example 1
And manufacturing a positive pole piece, a negative pole piece and a diaphragm. And coating the surfaces of the two side surfaces of the diaphragm with hot melt adhesive by using a coating device, so that the diaphragm is coated with the hot melt adhesive to form the diaphragm with the hot melt adhesive coating layer. Use the arc tape measure to carry out vertical coiling to positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating, the arc tape measure includes the fixed part of being connected with the coiling equipment and the winding part that is used for fixed positive pole piece, negative pole piece, diaphragm, is equipped with rectangular shape breach in the middle of the winding part and will convolute the part two halves to symmetrical, and one side of winding part is the plane, and the opposite side is the arcwall face, the calculation of arcwall face: the width F of the arc measuring tape is equal to B-D, and the arc length H of the arc measuring tape is equal to F-E; wherein, arc length is B in the arc battery, and the winding number of piles of arc battery is C, and the thickness of arc battery is D, and the central angle radius of arc battery is R, carries out N partition to the thickness D of arc battery earlier, and N is (C-2), and the arc length difference of every equal partition is E. After the operation is finished, a 3mm tab spot welding empty foil position is reserved, then a tab welding device is used for welding an anode tab at the welding point of the anode tab, and a cathode tab is welded at the welding point of a cathode tab, so that a lithium battery core is obtained. The method comprises the steps of placing a lithium battery cell into an aluminum-plastic sleeve for pre-packaging, carrying out hot press molding operation on a lithium battery to be formed, wherein the hot press temperature is 130 ℃, the pressure is 0.4MPa, the hot press time is 4 seconds, and carrying out packaging operation on the arc-shaped lithium battery to be packaged after hot press molding is completed to obtain the arc-shaped lithium battery.
Example 2
And manufacturing a positive pole piece, a negative pole piece and a diaphragm. And coating the surfaces of the two side surfaces of the diaphragm with hot melt adhesive by using a coating device, so that the diaphragm is coated with the hot melt adhesive to form the diaphragm with the hot melt adhesive coating layer. Use the arc tape measure to carry out vertical coiling to positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating, the arc tape measure includes the fixed part of being connected with the coiling equipment and the winding part that is used for fixed positive pole piece, negative pole piece, diaphragm, is equipped with rectangular shape breach in the middle of the winding part and will convolute the part two halves to symmetrical, and one side of winding part is the plane, and the opposite side is the arcwall face, the calculation of arcwall face: the width F of the arc measuring tape is equal to B-D, and the arc length H of the arc measuring tape is equal to F-E; wherein, arc length is B in the arc battery, and the winding number of piles of arc battery is C, and the thickness of arc battery is D, and the central angle radius of arc battery is R, carries out N partition to the thickness D of arc battery earlier, and N is (C-2), and the arc length difference of every equal partition is E. After the operation is finished, the 5mm pole lug spot welding empty foil position is reserved, then the pole lug welding device is used for welding the positive pole lug at the welding point of the positive pole lug, and the negative pole lug is welded at the welding point of the negative pole lug, so that the lithium battery cell is obtained. The method comprises the steps of placing a lithium battery cell into an aluminum-plastic sleeve for pre-packaging, carrying out hot press molding operation on a lithium battery to be formed, wherein the hot press temperature is 150 ℃, the pressure is 0.8MPa, the hot press time is 7 seconds, and carrying out packaging operation on the arc-shaped lithium battery to be packaged after hot press molding is completed to obtain the arc-shaped lithium battery.
Example 3
And manufacturing a positive pole piece, a negative pole piece and a diaphragm. And coating the surfaces of the two side surfaces of the diaphragm with hot melt adhesive by using a coating device, so that the diaphragm is coated with the hot melt adhesive to form the diaphragm with the hot melt adhesive coating layer. Use the arc tape measure to carry out vertical coiling to positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating, the arc tape measure includes the fixed part of being connected with the coiling equipment and the winding part that is used for fixed positive pole piece, negative pole piece, diaphragm, is equipped with rectangular shape breach in the middle of the winding part and will convolute the part two halves to symmetrical, and one side of winding part is the plane, and the opposite side is the arcwall face, the calculation of arcwall face: the width F of the arc measuring tape is equal to B-D, and the arc length H of the arc measuring tape is equal to F-E; wherein, arc length is B in the arc battery, and the winding number of piles of arc battery is C, and the thickness of arc battery is D, and the central angle radius of arc battery is R, carries out N partition to the thickness D of arc battery earlier, and N is (C-2), and the arc length difference of every equal partition is E. After the operation is finished, a 4mm tab spot welding empty foil position is reserved, then a tab welding device is used for welding an anode tab at the welding point of the anode tab, and a cathode tab is welded at the welding point of a cathode tab, so that a lithium battery core is obtained. The method comprises the steps of placing a lithium battery cell into an aluminum-plastic sleeve for pre-packaging, carrying out hot press molding operation on a lithium battery to be formed, wherein the hot press temperature is 140 ℃, the pressure is 0.6MPa, the hot press time is 5 seconds, and carrying out packaging operation on the arc-shaped lithium battery to be packaged after hot press molding is completed to obtain the arc-shaped lithium battery.
The application also provides an arc lithium battery, the arc lithium battery adopts as above any embodiment the arc lithium battery hot briquetting integration technology prepare and obtain. In one embodiment, the arc lithium battery comprises an arc battery cell and an arc aluminum plastic film coated on the outer surface of the arc battery cell.
As shown in fig. 2 to 4, in one embodiment, the arc-shaped battery cell 10 includes a battery cell body 100, a positive tab 200, and a negative tab 300, where the battery cell body 100 includes a positive tab 110, a first hot-melt adhesive coating layer 140, a separator 130, a second hot-melt adhesive coating layer 150, and a negative tab 120, which are sequentially stacked, the first hot-melt adhesive coating layer 140 and the second hot-melt adhesive coating layer 150 are both bonded to the separator 130, the positive tab 110 is bonded to the first hot-melt adhesive coating layer 140, the negative tab 120 is bonded to the second hot-melt adhesive coating layer 150, the battery cell body 100 is in an arc-shaped structure, the positive tab 200 is welded to the positive tab 110, and the negative tab 300 is welded to the negative tab 120. It should be noted that the arc-shaped battery core can be an arc-shaped lamination, and also can be an arc-shaped winding core.
Foretell arc electricity core 10 includes first hot melt adhesive coating 140 and first hot melt adhesive coating 150, first hot melt adhesive coating 140 bonds in one side of diaphragm 130, first hot melt adhesive coating 150 bonds in one side that diaphragm 130 deviates from first hot melt adhesive coating 140, when carrying out hot briquetting to arc electricity core 10, first hot melt adhesive coating 140 and first hot melt adhesive coating 150 have the cushioning effect to the stress that arc electricity core 10 received, thereby prevent that arc electricity core 10 from breaking or the problem of stereotyping failure appearing at the in-process of bending, and then make arc electricity core 10 change in the stereotyping. Further, first hot melt adhesive coating layer 140 bonds in one side of diaphragm 130, first hot melt adhesive coating layer 150 bonds in the one side that diaphragm 130 deviates from first hot melt adhesive coating layer 140, positive plate 110 bonds on first hot melt adhesive coating layer 140, negative plate 120 bonds on first hot melt adhesive coating layer 150, when arc electricity core 10 carries out the hot briquetting operation, first hot melt adhesive coating layer 140 and first hot melt adhesive coating layer 150 begin to melt and permeate each kink of arc electricity core 10, thereby can repair the fold that the hot pressing in-process produced, make the surface of arc electricity core 10 level and more smooth. In addition, the first hot melt adhesive coating layer 140 and the first hot melt adhesive coating layer 150 start to melt during hot press molding, so that the arc-shaped battery core 10 is easier to mold and has better surface smoothness. After the arc-shaped battery cell 10 is molded, because the surface of the arc-shaped battery cell 10 is restored to the room temperature, the first hot melt adhesive coating layer 140 and the first hot melt adhesive coating layer 150 are cooled and cured again, so that the arc-shaped battery cell 10 keeps the radian after molding, is not easy to rebound, and further achieves a better molding effect.
As shown in fig. 4 and 5, in one embodiment, the first hot melt adhesive coating layer 140 includes a first separator coating part 1420 and a first tab coating part 1430, the first separator coating part 1420 is adhered to one side of the separator 130, the first tab coating part 1430 is coated on the connection part of the positive tab 110 and the positive tab 200, that is, at least a part of the positive tab 200 and a part of the positive tab 110 are coated inside the first tab coating part 1430, and the first tab coating part 1430 is connected to the first separator coating part 1420. It can be understood that the positive tab 200 is connected to the positive plate 110, and when the arc lithium battery is hot-pressed, the arc directions of the positive tab 200 and the positive plate 110 are parallel, so that the connection between the positive tab 200 and the positive plate 110 is easily damaged due to a certain stress applied to the connection between the positive tab 200 and the positive plate 110. In order to improve the stability of the connection between the positive tab 200 and the positive tab 110 during the hot press forming process, in the present embodiment, the first hot melt adhesive coating layer 140 includes a first separator coating portion 1420 and a first tab coating portion 1430, the first separator coating portion 1420 is adhered to one side of the separator 130, the first tab coating portion 1430 is coated on the connection between the positive tab 110 and the positive tab 200, and the first tab coating portion 1430 is connected to the first separator coating portion 1420. In the hot press molding process of the arc-shaped lithium battery, the first diaphragm coating portion 1420 can buffer the stress applied to the pole piece and the diaphragm 130 of the arc-shaped battery cell 10, so that the arc-shaped battery cell 10 can be more easily shaped. The first tab coating portion 1430 is coated at the joint of the positive plate 110 and the positive tab 200, and when the hot press molding operation is performed, the first tab coating portion 1430 can relieve the stress on the joint of the positive plate 110 and the positive tab 200, so that the stability of the joint of the positive tab 200 and the positive tab 110 in the hot press molding process is improved. In addition, in the heat-sealing process of the arc-shaped lithium battery, the first tab coating part 1430 is melted, and a repairing and compensating effect is exerted on the packaging part, so that the bonding of the positive tab 200 is firmer, and the sealing performance is better.
As shown in fig. 4 and 5, in one embodiment, the first hot melt adhesive coating layer 150 includes a second separator coating portion 1520 and a second tab coating portion 1530, the second separator coating portion 1520 is adhered to a side of the separator 130 away from the first hot melt adhesive coating layer 140, the second tab coating portion 1530 is coated at a connection portion of the negative electrode tab 120 and the negative electrode tab 300, that is, at least a portion of the negative electrode tab 300 and a portion of the negative electrode tab 120 are coated inside the second tab coating portion 1530, and the second tab coating portion 1530 is connected to the second separator coating portion 1520. It can be understood that the negative electrode tab 300 is connected to the negative electrode sheet 120, and when the arc lithium battery is subjected to hot press molding, the radian directions of the negative electrode tab 300 and the negative electrode sheet 120 are parallel, so that a certain stress is applied to a joint of the negative electrode tab 300 and the negative electrode sheet 120, which may easily damage the connection between the negative electrode tab 300 and the negative electrode sheet 120. In order to improve the stability of the connection between the negative electrode tab 300 and the negative electrode tab 120 during the hot press molding process, in the present embodiment, the first hot melt adhesive coating layer 150 includes a second separator coating portion 1520 and a second electrode tab coating portion 1530, the second separator coating portion 1520 is adhered to the side of the separator 130 away from the first hot melt adhesive coating layer 140, the second electrode tab coating portion 1530 is coated at the connection between the negative electrode tab 120 and the negative electrode tab 300, and the second electrode tab coating portion 1530 is connected to the second separator coating portion 1520. In the hot press molding process of the arc-shaped lithium battery, the second separator coating portion 1520 can buffer the stress applied to the pole piece and the separator 130 in the arc-shaped battery cell 10, so that the arc-shaped battery cell 10 can be more easily shaped. The second tab coating portion 1530 coats the joint of the negative electrode tab 120 and the negative electrode tab 300, and when the hot press molding operation is performed, the second tab coating portion 1530 can relieve stress applied to the joint of the negative electrode tab 120 and the negative electrode tab 300, so that the stability of the joint of the negative electrode tab 300 and the negative electrode tab 120 in the hot press molding process is improved. In addition, in the heat sealing process of the arc lithium battery, the second tab coating portion 1530 is melted, and a repairing and compensating effect is provided to the sealing portion, so that the bonding of the negative tab 300 is firmer, and the sealing performance is better.
In one embodiment, the thickness of the central portion of the first hot melt adhesive coating layer 140 is greater than the thickness of the two side edges of the first hot melt adhesive coating layer 140. It can be understood that, when the arc lithium cell is carrying out hot briquetting, when treating the lithium cell that takes shape promptly and bend the operation, the stress that waits to take shape lithium cell middle part and receive is greater than the stress that its both sides limit received to make the department of bending of arc lithium cell comparatively fragile, overall structure stability is relatively poor. In order to further improve the structural stability of arc lithium cell and to the restoration compensation effect of the portion of bending of arc lithium cell, in this embodiment, the thickness of first hot melt adhesive coating 140 middle part is greater than the thickness on first hot melt adhesive coating 140 both sides limit, first hot melt adhesive coating 140 middle part is corresponding to the portion of bending of arc lithium cell, thereby make treat that the lithium cell that takes shape is in the shaping process of bending, the portion of bending can obtain better restoration compensation effect, and the structural stability of the arc lithium cell after the shaping is higher.
In one embodiment, the thickness of the middle portion of the first hot melt adhesive coating layer 150 is greater than the thickness of the two side edges of the first hot melt adhesive coating layer 150. It can be understood that, when the arc lithium cell is carrying out hot briquetting, when treating the lithium cell that takes shape promptly and bend the operation, the stress that waits to take shape lithium cell middle part and receive is greater than the stress that its both sides limit received to make the department of bending of arc lithium cell comparatively fragile, overall structure stability is relatively poor. In order to further improve the structural stability of arc lithium cell and to the restoration compensation effect of the portion of bending of arc lithium cell, in this embodiment, the thickness of first hot melt adhesive coating 150 middle part is greater than the thickness on first hot melt adhesive coating 150 both sides limit, first hot melt adhesive coating 150 middle part is corresponding to the portion of bending of arc lithium cell, thereby make treat that the lithium cell that takes shape is in the forming process of bending, the portion of bending can obtain better restoration compensation effect, and the structural stability of the arc lithium cell after the shaping is higher.
In one embodiment, the positive electrode sheet 110 includes a positive electrode collector, and the positive electrode collector has a plurality of first pores. It will be appreciated that the current collector functions primarily to collect the current generated by the active materials of the cell to provide a greater current output. To make the contact of the positive electrode current collector with the active material more sufficient and to effectively reduce the internal resistance. In this embodiment, the positive current collector is an aluminum foil, and a plurality of first pores are formed in the aluminum foil, so that the positive current collector is more fully contacted with the active material, and the internal resistance is effectively reduced. For traditional plain noodles foil, the anodal mass flow body can improve more than 5% on volume energy density in this embodiment, and the bending stress of electrode can be released to first pore on the aluminium foil simultaneously, improves electrode coating's pliability, reduces the arc forming process degree of difficulty of lithium cell.
Further, the diameter of the first fine hole is 0.1mm to 0.4 mm. It can be understood that, if the pore diameter of the first fine pores is large, the current collecting effect of the positive electrode current collector and the flexibility of the positive electrode current collector are easily affected; if the pore diameter of the first pores is small, the contact between the positive electrode current collector and the active material is insufficient, and the internal resistance is large. In order to further improve the current collecting effect of the positive current collector and effectively reduce the internal resistance, in this embodiment, the pore diameter of the first pore is 0.2mm, so that the positive current collector is more fully contacted with the active material, the internal resistance is effectively reduced, and the current collecting effect of the positive current collector and the flexibility of the positive current collector can be effectively ensured.
In one embodiment, the negative electrode sheet 120 includes a negative electrode collector having a plurality of second fine holes formed therein. It will be appreciated that the current collector functions primarily to collect the current generated by the active materials of the cell to provide a greater current output. To make the contact of the negative electrode current collector with the active material more sufficient and to effectively reduce the internal resistance. In this embodiment, the negative electrode current collector is a copper foil, and the plurality of second pores are formed in the copper foil, so that the negative electrode current collector is more sufficiently contacted with the active material, and the internal resistance is effectively reduced. For traditional plain noodles foil, the negative pole mass flow body can improve more than 5% on volume energy density in this embodiment, and the second pore on the aluminium foil can release the bending stress of electrode simultaneously, improves the pliability of electrode coating, reduces the arc forming process degree of difficulty of lithium cell.
Further, the diameter of the second pores is 0.1mm to 0.4 mm. It can be understood that, if the pore diameter of the second fine pores is large, the current collecting effect of the negative electrode current collector and the flexibility of the negative electrode current collector are easily affected; if the pore diameter of the second fine pores is small, the contact between the negative electrode current collector and the active material is insufficient, and the internal resistance is large. In order to further improve the current collecting effect of the negative current collector and effectively reduce the internal resistance, in this embodiment, the pore diameter of the second pore is 0.2mm, so that the negative current collector is more fully contacted with the active material, the internal resistance is effectively reduced, and the current collecting effect of the negative current collector and the flexibility of the negative current collector can be effectively ensured.
In one embodiment, the sum of the thicknesses of the first hot melt adhesive coating layer 140 and the first hot melt adhesive coating layer 150 is less than the thickness of the membrane 130. It will be appreciated that the membrane 130 is a thin film that serves to separate the anode and cathode from energy lost by direct reaction in the cell. In the structure of a lithium battery, the separator 130 is one of the key internal layer components, and the performance of the separator 130 determines the interface structure, internal resistance, etc. of the battery, and directly affects the characteristics of the battery, such as capacity, cycle, and safety performance. The thickness of the separator 130 also affects the amount of internal resistance of the separator 130 in a lithium battery construction. The first hot melt adhesive coating layer 140 is bonded to one side of the diaphragm 130, the first hot melt adhesive coating layer 150 is bonded to one side of the diaphragm 130 away from the first hot melt adhesive coating layer 140, the positive electrode sheet 110 is bonded to the first hot melt adhesive coating layer 140, and the negative electrode sheet 120 is bonded to the first hot melt adhesive coating layer 150. That is to say, the first hot melt adhesive coating layer 140, the separator 130 and the first hot melt adhesive coating layer 150 form a new separator, and the new separator has a larger thickness, which easily causes a larger internal resistance of the separator, and finally affects the electrical performance of the arc lithium battery. In order to reduce the internal resistance of the new diaphragm composed of the first hot melt adhesive coating layer 140, the diaphragm 130 and the first hot melt adhesive coating layer 150, in this embodiment, the sum of the thicknesses of the first hot melt adhesive coating layer 140 and the first hot melt adhesive coating layer 150 is smaller than the thickness of the diaphragm 130, so that on one hand, the flexibility and the adhesiveness of the diaphragm 130 can be effectively improved, and the arc lithium battery is easier to form; on the other hand, the internal resistance of the new diaphragm can be smaller, so that the electrical performance of the arc-shaped lithium battery is ensured.
In one embodiment, the bending direction of the positive electrode tab 110 and the negative electrode tab 120 is the same as the bending direction of the cell body 100. In this embodiment, adopt hot briquetting integration technology to carry out the shaping operation to electric core body 100, make the crooked direction of positive plate 110 and negative pole piece 120 unanimous with the crooked direction of electric core body 100 to increase the pliability after the electric core shaping, be convenient for carry out bending to the lithium cell and mould etc. and the coiling direction is parallel with arc shaping direction, the inside atress is even and the electric core inner structure that produces when preventing that electric core from carrying out the arc and moulding damages, prevent pole piece short circuit or the scheduling problem that opens circuit.
In one embodiment, the diaphragm is provided with a first groove and a second groove, the first hot melt adhesive coating layer is provided with a first protruding portion, the first protruding portion is embedded and arranged in the first groove, the second hot melt adhesive coating layer is provided with a second protruding portion, and the second protruding portion is embedded and arranged in the second groove. In this embodiment, first bellying inlays to be located in the first recess, and the second bellying inlays to be located in the second recess to it is inseparabler to make the diaphragm bond with first hot melt adhesive coating and second hot melt adhesive coating respectively, prevents effectively that the diaphragm from taking place to slide for first hot melt adhesive coating and second hot melt adhesive coating, and then makes the electric core body in the arc electricity core more stable.
Compared with the prior art, the invention has at least the following advantages:
1. according to the arc lithium battery hot press molding integrated process, the hot melt adhesive coating operation is carried out on the surface of the diaphragm, so that the hot melt adhesive coating layer is formed on the surface of the diaphragm, and the hot melt adhesive has good adhesive property, so that the diaphragm is more tightly and firmly adhered to the positive and negative pole pieces. So, after positive pole piece, negative pole piece and have the diaphragm of hot melt adhesive coating and convolute, can make lithium cell electric core's structure more stable.
2. After the winding operation is completed, the positive electrode tab is welded on the positive electrode plate, and the negative electrode tab is welded on the negative electrode plate, so that the lithium battery cell is obtained. Then put into the aluminium-plastic cover with lithium cell electricity core, obtain the lithium cell of waiting to take shape to the lithium cell of waiting to take shape carries out hot briquetting integration operation, can be with lithium cell electricity core and aluminium-plastic cover integration through hot briquetting integration on the one hand, and on the other hand can be with the arc lithium cell of waiting to take shape the lithium cell bending to predetermineeing the curvature. Compared with the traditional manufacturing method of the arc-shaped lithium battery, the manufacturing method of the arc-shaped lithium battery can realize hot press molding integration, thereby simplifying the manufacturing process of the arc-shaped lithium battery and improving the manufacturing efficiency. In addition, after the hot press forming integrated operation is completed, the surface temperature of the arc lithium battery is reduced, and the hot melt adhesive coated on the surface of the diaphragm is cured and formed again, so that the radian of the arc lithium battery is cured and kept stable, and the rebound phenomenon is not easy to occur.
3. In the hot-press forming process, the hot melt adhesive coated on the diaphragm is melted again, and the melted hot melt adhesive can flow in the aluminum plastic sleeve, so that a gap between aluminum plastic and the diaphragm is compensated when the lithium battery is subjected to arc forming, wrinkles generated on the surface of a bent part of the arc lithium battery in the hot-press process can be effectively repaired, the surface of the arc lithium battery is smoother, and the performance of the arc lithium battery is favorably improved.
The above examples only show some 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 (10)

1. A hot press molding integrated process of an arc-shaped lithium battery is characterized by comprising the following steps:
manufacturing a positive pole piece, a negative pole piece and a diaphragm;
performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with a hot melt adhesive coating layer;
winding the positive pole piece, the negative pole piece and the diaphragm with the hot melt adhesive coating layer;
welding a positive electrode lug on the positive electrode plate, and welding a negative electrode lug on the negative electrode plate to obtain a lithium battery cell;
putting the lithium battery cell into an aluminum-plastic sleeve to obtain a lithium battery to be formed;
carrying out hot press molding operation on the lithium battery to be formed to obtain an arc-shaped lithium battery to be packaged;
and carrying out packaging operation on the arc-shaped lithium battery to be packaged to obtain the arc-shaped lithium battery.
2. The integrated hot press molding process for arc lithium batteries as claimed in claim 1, wherein the melting point of the hot melt adhesive is less than the melting point of the separator.
3. The integrated hot press molding process for arc lithium batteries as claimed in claim 2, wherein the melting point of the hot melt adhesive is 100 ℃ to 120 ℃.
4. The integrated hot press molding process of an arc-shaped lithium battery as claimed in claim 1, wherein after the step of manufacturing the positive electrode plate, the negative electrode plate and the diaphragm, before the step of performing hot melt adhesive coating operation on the surface of the diaphragm to obtain the diaphragm with the hot melt adhesive coating layer, the integrated hot press molding process further comprises the following steps:
and heating the hot melt adhesive.
5. The integrated thermoforming process for arc-shaped lithium batteries as claimed in claim 1, wherein the hot melt adhesive comprises at least one of polyamide, polyester, polyethylene and polyesteramide.
6. The integrated hot press molding process of the arc-shaped lithium battery as claimed in claim 1, wherein after the step of placing the lithium battery cell in the aluminum plastic sleeve to obtain the lithium battery to be molded, before the step of performing hot press molding operation on the lithium battery to be molded to obtain the arc-shaped lithium battery to be packaged, the integrated hot press molding process further comprises the following steps:
and preheating the lithium battery to be formed.
7. The integrated hot press molding process for arc lithium batteries as claimed in claim 6, wherein the preheating temperature for preheating operation is 100 ℃ to 120 ℃.
8. The integrated hot press molding process of an arc-shaped lithium battery as claimed in claim 1, wherein the packaging operation specifically comprises the steps of:
packaging the top edge of the aluminum-plastic sleeve;
respectively packaging two side edges of the aluminum-plastic sleeve, and reserving a liquid injection port on one side edge of the aluminum-plastic sleeve;
sequentially carrying out liquid injection operation, formation operation and degassing operation on the arc-shaped lithium battery to be packaged through the liquid injection port;
and sealing the liquid injection port.
9. The integrated hot press molding process of an arc-shaped lithium battery as claimed in claim 1, wherein the step of performing the hot melt adhesive coating operation on the surface of the separator specifically comprises: and spraying hot melt adhesive on the surface of the diaphragm.
10. An arc lithium battery, characterized in that the arc lithium battery is prepared by the hot press molding integrated process of the arc lithium battery as claimed in any one of claims 1 to 9.
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