TWI472084B - 具有優異產率及安全性之二次電池 - Google Patents
具有優異產率及安全性之二次電池 Download PDFInfo
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Description
本發明係關於一種二次電池,其具有優異的製造操作性及安全性。尤指一種二次電池,其結構係具有一膠捲結構,該膠捲結構係組設於一圓柱型電池盒,其中一板狀絕緣件係組設於該膠捲頂部,且該絕緣件包括一穿孔入口及複數個孔洞,其中該穿孔入口用以進行電極端之氣體排放及滲透;且該複數個孔洞之直徑係為100 μm或以下,該複數個孔洞係遍及該絕緣件之整個表面。
因行動裝置相關技術的發展及其需求的增加帶動以二次電池作為能源的需求快速增加。於二次電池中,以具高能量密度、高放電電壓、以及優異的儲存和電池壽命之鋰二次電池最被積極的研究、商業化以及廣泛的使用。
依據電池盒的形狀,二次電池可分為:組設於圓筒狀金屬筒中的圓筒型電池、組設於矩形金屬筒中的矩形電池、及組設於由鋁製層壓板製成之袋型外殼中的袋型電池。其中,圓筒型電池有相對高的電容量以及優越的結構穩定性。組設於電池殼中的電極組件為能夠進行充電和放電之一電力產生裝置;該電極組件具有一陰極/分隔件/陽極層板結構,可分為膠捲型、堆疊型及堆疊/摺疊型。其中膠捲型係將活性材料塗佈之長片製成陰極與陽極,並將分隔件插入於陰極與陽極間捲曲而成;而堆疊型為製成複數陰
極與負數陽極,並將分隔件插入於陰極與陽極間並依序層狀堆疊而成;而堆疊/摺疊型則為膠捲型和堆疊型之綜合體。於此,膠捲型電極組件具有:簡易製造、及每單位重具有高能量密度之優點。
就此而言,圖1所示為傳統的圓柱型二次電池,圖2及圖3所示為一般使用於圓柱型二次電池之絕緣件之平面圖。
請參考圖示,一圓筒型二次電池100係藉由在一電池盒130中組設一膠捲型(卷繞型)電極組件120,於該電池盒130中注入一電解液,以及將一蓋組件140連接至該殼體130之敞頂部;其中該蓋組件140包含一電極端(例如:一陰極端;圖未示)。
該電極組件120係藉由在一陰極121及一陽極122之間插入一分隔件123,再將此結構捲曲成弧形。一圓柱狀中心銷150係插入該膠捲之核心(中心),該中心銷150通常由金屬所製成以賦予其一預定長度,並且具有一充分彎曲板材料(a roundly bent plate material)之中空狀圓柱結構。此中心銷150固定並支持該電極組件以及作為一通道,使排放經由在充電及放電與操作期間之內部反應所產生之氣體。
此外,一板狀絕緣件180a係組設於該電極組件120之頂部,且該板狀絕緣件180a之中心具有入口181a,其係連通該中心銷150之貫通孔151以排放氣體,且該電極組件120之陰極接頭(cathode tap)142係連接至蓋組件140之蓋板145。
然而,該絕緣件180a排列於該膠捲之頂部,此結構阻隔了一通道,其係於注入一電解液至該電池之過程中,使
該電解液滲入該電池之通道。據此,該電解液僅經由該入口181a滲入該電池,其中該入口181a連通中心銷150及該絕緣件180a之一區域,因此,由於注入電解液需要長時間,因而導致製造效能之衰減,故較為不利。
如圖3所示,為了改善該電解液之滲透性,建議使用之部分連接件180b,其係具有複數個貫通孔182b形成於一入口181b之周圍。
然而,此結構係被發現在安全性上具有嚴重的問題。即,在製造及/或組裝該蓋組件140、該電池盒130等之過程中,所產生之導電雜質微粒(如金屬粉末)係經由形成於該絕緣件180b之貫通孔182b滲入到該電極組件120,導致短路發生或電池壽命衰減之缺點。
有鑑於此,現在亟需一種可維持電安全性、及提升電解液之注入操作性之二次電池。
因此,本發明係用以解決上述問題及其他尚未被解決之技術問題。
本發明之目的係在提供一種二次電池,由於應用一新穎結構之絕緣件,該二次電池得以改善電解液之滲透性及促進電池之安全性、功能及製造操作性。
本發明係提供一種二次電池,其結構係具有一膠捲,該膠捲係具有一陰極/分隔件/陽極結構,且該膠捲係組設於一圓柱型電池盒;其中,一板狀絕緣件係安裝於該膠捲頂
部;以及該絕緣件包括一穿孔入口及複數個孔洞,其中該穿孔入口用以進行電極端之氣體排放及滲透;且該複數個孔洞之直徑係為100 μm或以下,該複數個孔洞係遍及該絕緣件之整個表面。
由於該絕緣件係組設於該膠捲頂部,當注入電解液時,該圓柱型二次電池之優點係使電解液滲入遍及該絕緣件之整個表面,與傳統上具有相對大直徑貫通孔之絕緣件相比,本發明可大幅改善液體注入及預防短路發生。
該絕緣件之材料沒有特別限制,可使用任何材料,其僅需具有絕緣性質即可。例如,該絕緣件之材料可為電絕緣聚合物樹脂或一電性絕緣聚合物複合材料,具體而言,該聚合物樹脂係選自由聚丙烯(PP)、聚苯乙烯(PS)、聚乙烯對苯二甲酸酯(PET)、天然橡膠、及合成橡膠所組成之群組。
由於材料之固有特性及薄片之形狀,因此,若有需要,為了促進電解液之滲透,該絕緣件可為一多孔狀不織布結構。
由前述,該絕緣件之孔洞之尺寸,可賦予該絕緣件之電性絕緣性質、固有性質,並在注入電解液時,該絕緣件之孔洞尺寸能使電解液滲入該絕緣件。據此,本發明之絕緣件係具有合適之孔洞。如上所述,該絕緣件之孔洞尺寸係為100 μm或以下。
經本發明之發明人確認,該孔洞尺寸不適合大於100 μm,其係由於在該電池組件之製程中,該蓋組件、電池盒
等會產生相當大小的金屬微粒經由該絕緣件之孔洞滲入膠捲,因此可能會引起短路。
例如,該孔洞之直徑較佳為10 μm至100 μm,以提供電解液之高滲透性。
於一較佳實施例中,遍及該絕緣件之整個表面,該孔洞可彼此以一預定距離間隔。
例如,該預定距離間隔可為10 μm至100 μm,且該距離可表示該絕緣件之孔洞間之距離。
該絕緣件之厚度較佳為0.1 mm至0.5 mm。若該絕緣件之厚度過小,該絕緣件無法發揮足夠的固有電性絕緣性質。
以下情形較為不利,若該二次電池交流電過大,導致在具有相同尺寸之電池盒中,膠捲之尺寸下降,因而使電池容量不利地減少。本發明亦可應用於一鋰二次電池,其係藉由在膠捲中注入含鋰的電解液。
本發明亦提供一種裝置,其包括作為一電源之二次電池。
較佳地,根據本發明之裝置,該裝置可用於如:行動電話、可攜式電腦、電動交通工具(EVs)、複合動力交通工具(HEVs)、插入式複合動力交通工具(PHEV)、及電能儲存系統上,以提供較優異的壽命及安全性。
現在,本發明將參考下述的實施例更加詳細的說明。這些實施例僅提供做為說明本發明之用,不應以此詮釋作為限制本發明之範圍與精神。
圖4係本發明一實施例之絕緣件之平面圖。
參照圖4及圖1,二次電池100之結構係具有一膠捲120,該膠捲120係具有一陰極121/分隔件123/陽極122結構,且該膠捲120係組設於一圓柱型電池盒130;其中,一絕緣件180係組設於該膠捲120之頂部。
絕緣件180c係由聚乙烯對苯二甲酸酯(PET)所組成,且絕緣件180c之厚度約為0.4 mm,又絕緣件180c之一側具有入口181c及遍及整個表面具有複數個微孔182c,該微孔182c之直徑為10至30 μm,且該微孔182c彼此以一預定距離間隔。
據此,透過複數個微孔182c,注入之電解液滲入絕緣件180c之整個表面,故可大幅改善液體注入及預防短路發生。
現在,本發明將參考下述的實施例更加詳細的說明。這些實施例僅提供做為說明本發明之用,不應以此詮釋作為限制本發明之範圍與精神。
如圖4所示,一聚丙烯製成之絕緣件,其厚度為0.4 mm,且一側形成具有6 mm寬、2.5 mm長之矩形入口及均勻分佈之複數個微孔,微孔彼此以一預定距離(約10至30 μm)間隔。接著,該絕緣件組設於一膠捲頂部,該膠捲係以一
中心銷為基礎捲曲一陰極/分隔件/陽極,且製造一18650標準型(直徑:18 mm,長度:65 mm)圓柱狀二次電池,其在電池組件製程中產生的相當大小的細微金屬粉末係排列於絕緣件上。
除了形成之複數個微孔,使用與實施例1相同的實驗方法製造一絕緣件及一二次電池;該複數個微孔之直徑為100 μm,且微孔彼此以一預定距離(約120 μm)間隔並均勻分佈遍及該絕緣件之整個表面。
如圖2所示,使用與實施例1相同的實驗方法製造一絕緣件及一二次電池,但不形成複數個微孔。
如圖3所示,使用與實施例1相同的實驗方法製造一絕緣件及一二次電池,但不形成三個直徑2.5 mm之貫通孔。
使用與實施例1相同的實驗方法製造一絕緣件及一二次電池,但沒有直徑為150 μm之該複數個微孔彼此以一預定距離(約120 μm)間隔並均勻分佈遍及該絕緣件之整個表面。
將實施例1及2與比較例1至3中所製造的二次電池進行電解液含浸測試(electrolytic solution impregnation test)。實驗結果如下表1所示。電解液含浸測試係藉由注入1 M LiPF6
碳酸電解液至該製造之圓柱型電池盒,測量該膠捲之含浸比(impregnation ratio)達到100%所需之時間,重複此程序四次並計算四個值之平均。此外,焊接一蓋組件至該製造之二次電池之敞頂部,各組產生10個樣品。將此樣品進行充電及放電測試並確認短路現象。結果如下表1所示。
由表1可知,根據本發明實施例1及2之電池,其與比較例1相比,可大幅縮短電解液之含浸時間。藉此,電解液可經由絕緣件之複數個微孔而有效滲透。
與比較例1相比,比較例2之電池顯示有改善浸透,但短路增加;而比較例3之電池亦比比較例1、2之電池更加浸
透,但短路比較高。其原因在於:金屬粉末滲入相對大之孔洞,而在該膠捲內部引起短路。
另一方面,雖然比較例1之電池上組設有絕緣件,而該絕緣件不具有如實施例1及2之微孔,但與實施例1及2相比,比較例1之電池顯示有高短路比。
造成高短路比之原因在於:在實施例1及2之電池中,當金屬粉末陷入微孔,金屬粉末的移動即被限制。反觀在比較例1之電池中,金屬粉末係自由移動於該絕緣件之平滑表面、及透過入口或絕緣件週邊移動至膠捲。
上述實施例僅係為了方便說明而舉例而已,本技術領域之人在不違背本發明揭露之申請專利範圍之範圍及精神下,可變化修改、添加及取代。
綜上所述,根據本發明之二次電池,其包含絕緣件,絕緣件之整個表面上具有複數個預定尺寸以下之微孔,故可有效防止短路發生;並使電解液經由絕緣件滲透,最終大幅改善電池之安全性、功能、壽命及製造操作性。
100‧‧‧圓筒型二次電池
120‧‧‧電極組件
121‧‧‧陰極
122‧‧‧陽極
123‧‧‧分隔件
130‧‧‧電池盒
140‧‧‧蓋組件
142‧‧‧陰極接頭
145‧‧‧蓋板
150‧‧‧中心銷
151‧‧‧貫通孔
180a,180b,180c‧‧‧絕緣件
181a,181b,181c‧‧‧入口
182a,182b,182c‧‧‧微孔
圖1係代表性圓柱型二次電池之剖面示意圖。
圖2係用於圖1之二次電池之絕緣件之平面圖。
圖3係用於圖1之二次電池之另一絕緣件之平面圖。
圖4係本發明一實施例之絕緣件之平面圖。
180c‧‧‧絕緣件
181c‧‧‧入口
182c‧‧‧微孔
Claims (10)
- 一種二次電池,其結構係具有一膠捲,該膠捲係具有一陰極/分隔件/陽極結構,且該膠捲係組設於一圓柱型電池盒;其中,一板狀絕緣件係組設於該膠捲頂部;該絕緣件包括一穿孔入口及複數個孔洞,其中該穿孔入口用以進行電極端之氣體排放及滲透;且該複數個孔洞之直徑係為100μm或以下,該複數個孔洞係遍及該絕緣件之整個表面,其中,該絕緣件具有一不織布結構。
- 如申請專利範圍第1項所述之二次電池,其中,該絕緣件係由一電性絕緣聚合物樹脂或一電性絕緣聚合物複合材料所製成。
- 如申請專利範圍第2項所述之二次電池,其中,該聚合物樹脂係選自由聚丙烯(PP)、聚苯乙烯(PS)、聚乙烯對苯二甲酸酯(PET)、天然橡膠、及合成橡膠所組成之群組。
- 如申請專利範圍第1項所述之二次電池,其中,在注入一電解液時,該絕緣件之孔洞之尺寸係能使該電解液通過該孔洞。
- 如申請專利範圍第4項所述之二次電池,其中,該絕緣件之孔洞之尺寸係為10μm至100μm。
- 如申請專利範圍第1項所述之二次電池,其中,該孔洞係彼此以一預定距離間隔,遍及該絕緣件之整個表面。
- 如申請專利範圍第1項所述之二次電池,其中,該絕緣件之厚度係為0.1mm至0.5mm。
- 如申請專利範圍第1項所述之二次電池,其中,該電池係為一鋰二次電池。
- 一種裝置,包括:一如申請專利範圍第1項至第8項中任一項所述之二次電池以作為一電源。
- 如申請專利範圍第9項所述之裝置,其中,該裝置係選自於一行動電話、一可攜式電腦、一電動交通工具(EV)、一複合動力交通工具(HEV)、一插入式複合動力交通工具(PHEV)、及一電能儲存裝置。
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