CN109004262A - 一种弯曲聚合物锂离子电池 - Google Patents
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Abstract
本发明涉及一种弯曲聚合物锂离子电池,包括柔性外壳,所述柔性外壳内填装有正、负极片;所述正、负极片采用冲切刀模进行冲切,冲成栅格形状的若干电极片;所述正极片冲切成固定栅格形状,其中一端留有空箔;所述负极片冲切成固定栅格形状,其中一端留有空箔;所述正极片与负极片所留空箔是为了转接极耳,冲切后的正负极片采用叠片组装的方式形成电池芯包,将所述电池芯包放置于成型的柔性壳体内,对壳体进行封,制得柔性电芯。本发明制作简单、实用,易生产的柔性聚合物锂离子电芯,适用于各移动设备及可穿戴设备。
Description
技术领域
本发明涉及锂离子电池技术领域,具体涉及一种聚合物锂离子电池。
背景技术
锂离子以其高能量密度,高工作电压、长循环寿命环保安全等优点,一直以来在在便携式电子产品中得到大量普及使用。随着电子工业不断发展,便携式消费类电子产品功能越来越多,越来越完善强大,尤其是智能手机、平板电脑、可穿戴设备的出现,其功能强大,元器件繁多,对电量需求较大,充放次数频繁,对随机匹配到的电池能量密度,循环寿命,安全性能要求越来越高,而移动设备、可穿戴设备锂离子电池外型种类多。
发明内容
本发明的目的是针对现技术空缺,提供一种柔性聚合物软包装铝塑膜聚合物锂离子电池,其制作简单、实用,易生产且适用于各移动设备及可穿戴设备。
为解决上述技术问题,本发明提供的技术方案是:
一种弯曲聚合物锂离子电池,包括柔性外壳,所述柔性外壳内填装有正、负极片;所述正、负极片采用冲切刀模进行冲切,冲成栅格形状的若干电极片;所述正极片冲切成固定栅格形状,其中一端留有空箔;所述负极片冲切成固定栅格形状,其中一端留有空箔;所述正极片与负极片所留空箔是为了转接极耳,冲切后的正负极片采用叠片组装的方式形成电池芯包,将所述电池芯包放置于成型的柔性壳体内,对壳体进行封装。
进一步的,所述栅格形状为交叉棱形。
所述外壳体为柔性壳,优选的,采用包含PP、PE、PET、尼龙及与金属层的柔性材质,如铝塑膜,钢塑膜。
所述正、负极电极均为常规锂离子电池材料制得的电极片,通过冲切成规整栅格状。
所述正负极结合组装方式为叠片结构,所述隔膜与正极形成整体结构。
所述隔膜采用为PP、PE或PP与PE混合材质隔膜,在隔膜表面涂有PAA或PVDF或PAA、PVDF与陶瓷粉体的混合物形成的涂覆层。
所述壳体成型冲壳形状为栅格状。
电极片中的栅格长度a为8-20mm,栅格高度b为2-8mm;所述正、负极片栅格交错排列。
所述柔性外壳的厚度C为0.07~0.15mm。
制得的弯曲聚合物锂离子电池的厚度T为0.5~3.0mm。
与现有技术相比,本发明的有益效果是:
本发明主要采用叠片型工艺,其正电极与负电极都采用冲切刀模进行冲切成棱形栅格状,正负极之前采用隔膜纸进行绝缘隔离,电极片顶部留空箔进行转接极耳。叠片制得的芯包放置于成形的栅格形壳体中进行封装制得电芯,电芯因为电极与壳体的交叉棱形分布,所述弯曲柔性电芯主要体现在可正反向进行弯曲,在弯曲的过程中不会损伤内部电极。柔性弯曲的电芯可适用于各移动设备领域,尤其是在穿戴设备有较高的可应用性。
附图说明
图1:正极片、负极片的结构示意图。
图2:电池封头的结构示意图。
图3:电池壳体示意图。
图4:电池芯包的装配立体结构示意图。
图5:成品电池示意图。
图6:成品电池实物图。
图中:1-第一热封头,2-第二热封头,3-第一柔性外壳,4-正极片,5-隔膜,6-负极片,7-第二柔性外壳。
具体实施方式
下面结合具体实施例对本发明作进一步说明。
一种圆柔性弯曲锂离子电池,包括第一柔性外壳3,第二柔性外壳7,所述柔性外壳内填装有正极片4、负极片6;所述正电极片极耳的一个末端外接正极耳,所述负极片的一个末端外接负极耳;,正极片和负极片之间间隔有隔膜5,叠片组装成形成电池芯包;所述电池芯包安装于第一柔性外壳3,第二柔性外壳7内,所述正、负极耳从柔性壳体上方引出,所述柔性壳体用第二热封头2,第一热封头1进行封装。
所述电极片中的栅格长度a为8-20mm,栅格高度b为2-8mm,。所述负正负极片栅格交错排列。所述柔性外壳的厚度C为0.07~0.15mm。所述柔性弯曲锂离子电池厚度T为
0.5~3.0mm。
本发明所述的采用冲切刀模冲切的正、负极片为用电极活性物质涂覆的极片,涂覆可采用的材料和方法均为本领域公知技术,在此不作特别说明。
以下对柔性弯曲锂离子电池的电池容量、尺寸进行测定,所采用的材料等具体内容仅为对发明的柔性型锂离子电池进行实验测定所举例,并非特别限制。
实施例1
将正极活性物质LiCo2、正极粘结剂PVDF、导电剂碳黑、溶剂NMP以比例100:1.6.1.2:45的配料方式配料混合制得浆料,将浆料采用转移涂布方式均匀涂覆在铝箔集流体上双面并干燥、碾压、分切后制备得正极极片。负极活性物质石墨、负极分散剂CMC、负极粘结剂SBR、导电剂导电碳黑及水溶剂以比例100:2:3:2:90的方式配料混合制得浆料。将浆料采用转移涂布方式均匀涂覆在铜箔集流体上双面并干燥、碾压、冲切后制备得厚度100um、有料面积为10cm2,层数2层、对应负极有相同的层数,其对应负电极宽和高度全覆盖超过正极。
将上述制得的正、负极片与隔膜(PP/PE/PP)一起按一定的按叠片方式成一个方型锂离子电芯、入壳(铝塑包装膜形成)、注液后制得得有电解液的锂离子电池。经预化成后。排气封口、切边、常温静置3天后、分选容量(充电:0.5充电至4.35V,恒压充电至电流小于0.02C,放电以0.5C放电至3.0V)以0.5C充电至3.86V测量其厚度尺寸和容量,制得成品电池。
实施例2
本实施例与实施例1所采用的原材料,生产步骤、检测方法基本相同,唯一不同之处,本例提供厚度100um、有料面积为10cm2,层数4层、对应负极有相同的层数,其对应负电极宽和高度全覆盖超过正极。
实施例3
本实施例与实施例1所采用的原材料,生产步骤、检测方法基本相同,唯一不同之处,本例提供厚度100um、有料面积为10cm2,层数6层、对应负极有相同的层数,其对应负电极宽和高度全覆盖超过正极。
实施例4
本实施例与实施例1所采用的原材料,生产步骤、检测方法基本相同,唯一不同之处,本例提供厚度100um、有料面积为10cm2,层数7层、对应负极有相同的层数,其对应负电极宽和高度全覆盖超过正极。
实施例5
本实施例与实施例1所采用的原材料,生产步骤、检测方法基本相同,唯一不同之处,本本例提供厚度100um、有料面积为10cm2,层数9层、对应负极有相同的层数,其对应负电极宽和高度全覆盖超过正极。
表1
由表1可知,采用本发明制备的锂离子电池与厚度容量正常,本发明新型提供的电极制作方式、及电池外形都极具可操作性用和实际应用。
以上所述,仅是本发明的较佳实施例,并非对本发明作任何形式上的限制,任何熟悉本专业的技术人员,在不脱离本发明技术方案范围内,依据本发明的技术实质,对以上实施例所作的任何简单的修改、等同替换与改进等,均仍属于本发明技术方案的保护范围之内。
Claims (10)
1.一种弯曲聚合物锂离子电池,其特征在于:包括柔性外壳,所述柔性外壳内填装有正、负极片;所述正、负极片采用冲切刀模进行冲切,冲成栅格形状的若干电极片;所述正极片冲切成固定栅格形状,其中一端留有空箔;所述负极片冲切成固定栅格形状,其中一端留有空箔;所述正极片与负极片所留空箔是为了转接极耳,冲切后的正负极片采用叠片组装的方式形成电池芯包,将所述电池芯包放置于成型的柔性壳体内,对壳体进行封装。
2.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述栅格形状为交叉棱形。
3.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述外壳体为柔性壳,采用包含PP、PE、PET、尼龙及与金属层的柔性材质。
4.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述正、负极电极均为常规锂离子电池材料制得的电极片,通过冲切成规整栅格状。
5.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述正负极结合组装方式为叠片结构,所述隔膜与正极形成整体结构。
6.根据权利要求5所述的弯曲聚合物锂离子电池,其特征在于:所述隔膜采用为PP、PE或PP与PE混合材质隔膜,在隔膜表面涂有PAA或PVDF或PAA、PVDF与陶瓷粉体的混合物形成的涂覆层。
7.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述壳体成型冲壳形状为栅格状。
8.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:电极片中的栅格长度a为8-20mm,栅格高度b为2-8mm;所述正、负极片栅格交错排列。
9.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:所述柔性外壳的厚度C为0.07~0.15mm。
10.根据权利要求1所述的弯曲聚合物锂离子电池,其特征在于:制得的弯曲聚合物锂离子电池的厚度T为0.5~3.0mm。
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