CN103762387B - Preparation method of coiled polymer lithium battery and coiled polymer lithium battery - Google Patents
Preparation method of coiled polymer lithium battery and coiled polymer lithium battery Download PDFInfo
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- CN103762387B CN103762387B CN201410035580.8A CN201410035580A CN103762387B CN 103762387 B CN103762387 B CN 103762387B CN 201410035580 A CN201410035580 A CN 201410035580A CN 103762387 B CN103762387 B CN 103762387B
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- 229920000642 polymer Polymers 0.000 title claims abstract description 34
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000011888 foil Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000003292 glue Substances 0.000 claims description 6
- 239000007770 graphite material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 7
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims 1
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 claims 1
- 239000002253 acid Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 claims 1
- 229910017052 cobalt Inorganic materials 0.000 claims 1
- 239000010941 cobalt Substances 0.000 claims 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 38
- 238000004806 packaging method and process Methods 0.000 abstract description 11
- 239000003792 electrolyte Substances 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 10
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 2
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 2
- VLXXBCXTUVRROQ-UHFFFAOYSA-N lithium;oxido-oxo-(oxomanganiooxy)manganese Chemical compound [Li+].[O-][Mn](=O)O[Mn]=O VLXXBCXTUVRROQ-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
技术领域technical field
本发明涉及锂离子电池，特别涉及一种卷绕式聚合物锂电池的制备方法及卷绕式聚合物锂电池。The invention relates to a lithium ion battery, in particular to a preparation method of a winding polymer lithium battery and the winding polymer lithium battery.
背景技术Background technique
软包锂离子电池重量轻、安全性能好等优点，故在蓝牙、2G/3G手机、笔记本电脑、平板电脑、摄像机等移动电子设备以及便携式移动电源等领域的应用日益广泛，尤其是其优异的安全性能，使其越来越多地取代液态的铝壳或钢壳锂离子电池。Soft-pack lithium-ion batteries have the advantages of light weight and good safety performance, so they are increasingly widely used in mobile electronic devices such as Bluetooth, 2G/3G mobile phones, notebook computers, tablet computers, cameras, and portable mobile power supplies, especially for their excellent Safety performance makes it increasingly replace liquid aluminum or steel lithium-ion batteries.
聚合物锂离子电池因其可以量身定做（外形尺寸任意定制）、能量密度高、尽管聚合物锂离子电池具有良好的安全性，但是，卷绕式的机构也存在一定的缺陷，卷绕后注夜的电芯，极片面直接面对注夜口，电解液需要绕过极片面从卷绕层面渗透到卷芯内部和极片内部去，注夜后需要相当长的时间静置，确保电解液的充分吸收。对于较小较窄的电池，当外形尺寸较小，极耳中心距控制成为一个大的难题。因此，现有技术尚有待改进和发展。Polymer lithium-ion batteries can be customized (any size can be customized) and have high energy density. Although polymer lithium-ion batteries have good safety, the winding mechanism also has certain defects. Injected batteries, the electrode surface directly faces the injection port, the electrolyte needs to bypass the electrode surface and penetrate from the winding layer to the inside of the core and the inside of the electrode. After injection, it needs to stand for a long time to ensure electrolysis. full absorption of liquid. For smaller and narrower batteries, when the size is small, the control of the center distance of the tabs becomes a big problem. Therefore, the prior art still needs to be improved and developed.
发明内容Contents of the invention
本发明的目的在于提供一种新型的卷绕式聚合物锂电池的制备方法及实现上述方法的卷绕式聚合物锂电池。The object of the present invention is to provide a novel method for preparing a wound polymer lithium battery and a wound polymer lithium battery for realizing the method.
根据本发明的一方面，提供了一种卷绕式聚合物锂电池的制备方法，包括如下步骤：According to one aspect of the present invention, there is provided a method for preparing a wound polymer lithium battery, comprising the steps of:
（1）、制备扁平状的正极片和负极片，正极耳、负极耳以及隔膜；(1) Prepare flat positive and negative electrodes, positive tabs, negative tabs and diaphragms;
（2）、先将隔膜缠绕一圈，再将负极片的始端置于上述隔膜之间，然后再将正极片的始端放入，且负极片与正极片由隔膜隔开，接着将负极片、隔膜和正极片相互卷绕在一起，得到卷绕式聚合物锂电池裸电芯的卷绕体；(2) Wrap the diaphragm once, then place the beginning of the negative electrode between the above diaphragms, then put the beginning of the positive electrode, and the negative electrode and the positive electrode are separated by the diaphragm, then put the negative electrode, The separator and the positive electrode sheet are wound together to obtain a wound body of a wound polymer lithium battery bare cell;
（3）、将正极耳焊接在正极片收尾的位置，并与正极片宽度方向垂直,同理将负极耳焊接在负极片收尾的位置，并与负极片宽度方向垂直；(3) Weld the positive tab at the end of the positive plate and be perpendicular to the width direction of the positive plate. Similarly, weld the negative tab at the end of the negative plate and be perpendicular to the width of the negative plate;
（4）、最后将卷绕体装配于包装壳中，并依次进行封装、真空干燥、注夜、封口、化成、分容、检验，得到卷绕式聚合物锂电池。(4) Finally, the winding body is assembled in the packaging case, and the packaging, vacuum drying, injection, sealing, formation, volume separation, and inspection are carried out in sequence to obtain a winding polymer lithium battery.
特别的，步骤（2）还包括如下：在所述正极片的始端以及收尾位置预留空箔位，空箔位采用绿胶沾合。In particular, step (2) further includes the following steps: reserve empty foil positions at the beginning and end of the positive electrode sheet, and stick the empty foil positions with green glue.
特别的，步骤（3）还包括如下：所述正极片、负极片的收尾伸出方向与卷绕体的卷绕方向同向。In particular, the step (3) further includes the following: the extension direction of the positive electrode sheet and the negative electrode sheet is in the same direction as the winding direction of the winding body.
特别的，步骤（3）还包括如下：正极耳的焊接位置靠近正极片的边缘，负极耳的焊接位置离负极片边缘的距离为负极片宽度减去正极片宽度的一半。In particular, step (3) further includes the following steps: the welding position of the positive tab is close to the edge of the positive tab, and the distance between the welding position of the negative tab and the edge of the negative tab is equal to the width of the negative tab minus half of the width of the positive tab.
特别的，步骤（4）还包括如下：卷绕体装配于包装壳时，卷绕体的层数面朝注液气囊袋位置。In particular, step (4) further includes the following: when the winding body is assembled in the packaging shell, the layers of the winding body face the position of the liquid injection air bag.
一种上述方法的卷绕式聚合物锂电池，包括包装壳以及装配于包装壳内的卷绕体，所述卷绕体包括隔膜、正极片以及负极片，所述正极片与负极片通过隔膜隔开并卷绕一定的圈数，在所述正极片与负极片的收尾处分别焊接有正极耳和负极耳，所述正极耳的露出端与所述正极片的宽度方向垂直，所述负极耳的露出端与所述负极片的宽度方向垂直。A winding polymer lithium battery according to the above method, comprising a packaging case and a winding body assembled in the packaging case, the winding body includes a separator, a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet pass through the separator Separate and wind a certain number of turns, and respectively weld a positive pole ear and a negative pole ear at the end of the positive pole piece and the negative pole piece, the exposed end of the positive pole piece is perpendicular to the width direction of the positive pole piece, and the negative pole piece The exposed end of the ear is perpendicular to the width direction of the negative electrode sheet.
特别的，正极耳的始端和收尾端均设置有空白箔，且通过绿胶将空白箔固定。In particular, a blank foil is provided at the beginning and end of the positive tab, and the blank foil is fixed by green glue.
特别的，正极耳的焊接位置靠正极片的边缘，所述负极耳的焊接位置离负极片边缘的距离为负极片宽度减去正极片宽度的一半。In particular, the welding position of the positive tab is close to the edge of the positive tab, and the distance between the welding position of the negative tab and the edge of the negative tab is equal to the width of the negative tab minus half of the width of the positive tab.
特别的，正极片、负极片的收尾伸出方向与卷绕体的卷绕方向同向，正极耳和负极耳的收尾均在卷绕体的拐角处。In particular, the protruding direction of the ends of the positive electrode sheet and the negative electrode sheet is in the same direction as the winding direction of the wound body, and the ends of the positive and negative electrode tabs are both at the corners of the wound body.
特别的，正极片采用钴酸锂、锰酸锂、三元材料和磷酸铁锂材料制成，所述负极片为石墨材料制成的极片。In particular, the positive electrode sheet is made of lithium cobalt oxide, lithium manganese oxide, ternary material and lithium iron phosphate material, and the negative electrode sheet is made of graphite material.
本发明的有益效果是：与现有技术中的卷绕式聚合物锂电池及其正负极片的内部结构相比，调整极耳点焊方式及位置，改变电芯的卷绕结构，减小极耳中心距的偏差，卷芯层数面方向朝气囊袋位置，缩短电解液进入卷芯内部的时间，有利于电解液的快速吸收，减少注夜后静置时间。The beneficial effects of the present invention are: compared with the internal structure of the winding polymer lithium battery and its positive and negative plates in the prior art, the spot welding method and position of the tabs are adjusted, the winding structure of the battery core is changed, and the battery is reduced. The deviation of the center distance of the tabs is small, and the direction of the layers of the core is facing the position of the air bag, which shortens the time for the electrolyte to enter the core, which is conducive to the rapid absorption of the electrolyte and reduces the standing time after injection.
附图说明Description of drawings
图1为本发明的一种卷绕式聚合物锂电池截面结构示意图。Fig. 1 is a schematic cross-sectional structure diagram of a winding polymer lithium battery of the present invention.
图2为图1的卷绕式聚合物锂电池的结构示意图。FIG. 2 is a schematic structural view of the wound polymer lithium battery in FIG. 1 .
具体实施方式detailed description
下面结合附图对本发明作进一步详细的说明。The present invention will be described in further detail below in conjunction with the accompanying drawings.
图1至图2示意性地显示了根据本发明的一种卷绕式聚合物锂电池。1 to 2 schematically show a wound polymer lithium battery according to the present invention.
根据本发明的一方面，提供了一种卷绕式聚合物锂电池的制备方法，包括如下步骤：According to one aspect of the present invention, there is provided a method for preparing a wound polymer lithium battery, comprising the steps of:
（1）、制备扁平状的正极片003和负极片002，正极耳005、负极耳006以及隔膜001；(1) Prepare flat positive electrode sheet 003 and negative electrode sheet 002, positive electrode ear 005, negative electrode ear 006 and separator 001;
（2）、如图1先通过卷针将隔膜001缠绕一圈，再将负极片002的始端置于上述隔膜001之间，然后再将正极片003的始端放入，且负极片002与正极片003由隔膜001隔开，其中在所述正极片003的始端以及收尾位置预留空箔位，空箔位采用绿胶004沾合，防止负极头部毛刺刺穿隔膜001与正极接触短路，接着将负极片002、隔膜001和正极片003卷绕一定的圈数，且其圈数得到卷绕式聚合物锂电池裸电芯的卷绕体，特别说明的是卷绕的圈数在这里并不作具体限定，该圈数可根据实际情况而进行调整不应作为限制本发明方法的条件；(2) As shown in Figure 1, first wind the separator 001 with a winding needle, then place the beginning of the negative electrode sheet 002 between the above separators 001, and then put the beginning of the positive electrode sheet 003, and the negative electrode sheet 002 and the positive electrode The sheet 003 is separated by the diaphragm 001, wherein an empty foil position is reserved at the beginning and end of the positive electrode sheet 003, and the empty foil position is glued with green glue 004 to prevent the burr on the head of the negative electrode from piercing the diaphragm 001 and contacting the positive electrode for short circuit. Then wind the negative electrode sheet 002, the separator 001 and the positive electrode sheet 003 for a certain number of turns, and the number of turns is obtained as a wound body of a wound polymer lithium battery bare cell. In particular, the number of turns of the winding is here Not specifically limited, the number of turns can be adjusted according to actual conditions and should not be used as a condition for limiting the method of the present invention;
（3）、如图2所示，将正极耳005焊接在正极片003收尾的位置，并与正极片003宽度方向垂直,正极耳005的焊接位置靠近正极片003的边缘，同理将负极耳006焊接在负极片002收尾的位置，并与负极片002宽度方向垂直，负极耳006的焊接位置离负极片002边缘的距离为负极片002宽度减去正极片003宽度的一半,上述的正极片003、负极片002的收尾伸出方向与卷绕体的卷绕方向同向；(3) As shown in Figure 2, weld the positive tab 005 to the end position of the positive tab 003 and be perpendicular to the width direction of the positive tab 003. The welding position of the positive tab 005 is close to the edge of the positive tab 003. Similarly, the negative tab 006 is welded at the end position of the negative electrode sheet 002 and is perpendicular to the width direction of the negative electrode sheet 002. The distance between the welding position of the negative electrode ear 006 and the edge of the negative electrode sheet 002 is the width of the negative electrode sheet 002 minus half of the width of the positive electrode sheet 003. 003. The extension direction of the end of the negative electrode sheet 002 is the same as the winding direction of the winding body;
（4）、最后将卷绕体装配于包装壳中，卷绕体的层数面朝注液气囊袋位置,并依次进行封装、真空干燥、注夜、封口、化成、分容、检验，得到卷绕式聚合物锂电池。(4) Finally, the winding body is assembled in the packaging shell, and the layers of the winding body face the position of the liquid injection airbag bag, and the packaging, vacuum drying, injection, sealing, formation, volume separation, and inspection are carried out in sequence to obtain Wound polymer lithium battery.
一种上述方法的卷绕式聚合物锂电池，包括包装壳以及装配于包装壳内的卷绕体，所述卷绕体包括隔膜001、正极片003以及负极片002，所述正极片003与负极片002通过隔膜001隔开并卷绕一定的圈数，在所述正极片003与负极片002的收尾处分别焊接有正极耳005和负极耳006，所述正极耳005的露出端与所述正极片003的宽度方向垂直，正极耳005的焊接位置靠正极片003的边缘，所述负极耳006的露出端与所述负极片002的宽度方向垂直，所述负极耳006的焊接位置离负极片002边缘的距离为负极片002宽度减去正极片003宽度的一半，特别的是正极片003、负极片002的收尾伸出方向与卷绕体的卷绕方向同向，正极耳005和负极耳006的收尾均在卷绕体的拐角处，在正极耳005的始端和收尾端均设置有空白箔，且通过绿胶004将空白箔固定。A winding polymer lithium battery according to the above method, comprising a packaging case and a winding body assembled in the packaging case, the winding body comprising a separator 001, a positive electrode sheet 003 and a negative electrode sheet 002, the positive electrode sheet 003 and the negative electrode sheet 002 The negative electrode sheet 002 is separated by a diaphragm 001 and wound for a certain number of turns. A positive electrode ear 005 and a negative electrode ear 006 are respectively welded at the ends of the positive electrode sheet 003 and the negative electrode sheet 002. The exposed end of the positive electrode ear 005 is connected to the The width direction of the positive electrode sheet 003 is vertical, the welding position of the positive electrode ear 005 is close to the edge of the positive electrode sheet 003, the exposed end of the negative electrode ear 006 is perpendicular to the width direction of the negative electrode sheet 002, and the welding position of the negative electrode ear 006 is away from The distance from the edge of the negative electrode sheet 002 is the width of the negative electrode sheet 002 minus half of the width of the positive electrode sheet 003. In particular, the extension direction of the positive electrode sheet 003 and the negative electrode sheet 002 is in the same direction as the winding direction of the winding body, and the positive electrode ear 005 and The ends of the negative tabs 006 are all at the corners of the wound body, and blank foils are provided at the beginning and end of the positive tabs 005, and the blank foils are fixed by green glue 004.
在本实施例中可正极片003采用钴酸锂、锰酸锂、三元材料和磷酸铁锂材料任意一种材料制成，所述负极片002为石墨材料制成的极片，当然需要说明的是此处所提及的材料仅为一种示意性的举例，使用同等功能的材料替换上述材料亦可视为本发明的保护范围之内。In this embodiment, the positive electrode sheet 003 can be made of any material such as lithium cobalt oxide, lithium manganese oxide, ternary material, and lithium iron phosphate material, and the negative electrode sheet 002 is a electrode sheet made of graphite material, of course it needs to be explained It is noted that the materials mentioned here are only illustrative examples, and the replacement of the above-mentioned materials with materials with equivalent functions can also be considered within the protection scope of the present invention.
本发明的有益效果是：与现有技术中的卷绕式聚合物锂电池及其正负极片002的内部结构相比，调整极耳点焊方式及位置，改变电芯的卷绕结构，减小极耳中心距的偏差，卷芯层数面方向朝气囊袋位置，缩短电解液进入卷芯内部的时间，有利于电解液的快速吸收，减少注夜后静置时间。The beneficial effects of the present invention are: compared with the internal structure of the wound polymer lithium battery and its positive and negative plates 002 in the prior art, the spot welding method and position of the tabs are adjusted, the winding structure of the battery core is changed, Reduce the deviation of the center distance of the tabs, and the direction of the layers of the core is towards the position of the air bag, shortening the time for the electrolyte to enter the core, which is conducive to the rapid absorption of the electrolyte and reducing the standing time after injection.
最后应当说明的是，以上实施例仅用以说明本发明的技术方案，而非对本发明保护范围的限制，尽管参照较佳实施例对本发明作了详细地说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的实质和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand , the technical solution of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solution of the present invention.
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