JPH11213966A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light and thin battery case while improving the molding property thereof by forming a case of an outer layer of polychlorotrifluoroethylene and an inner layer of the sealant having heat sealing property, and performing Al deposition after the molding, and setting thickness of the Al deposition layer in a specified range. SOLUTION: A battery is formed of a case 5 for sealing a positive and a negative electrodes and the electrolyte filled in a battery as battery structural material and a cover material 4, and the case 5 is formed of an outer layer of polychlorotrifluoroethylene 1 and an inner layer 2 of the sealant having heat sealing property. Al deposition is performed after the molding, and thickness of an Al deposition layer 3 is set at 0.1-5 μm. In this case, as for barrier performance after leaving it for 168 hours at 60 deg.C, a reduction rate of electrolyte is 0.5% or less, increase ratio of the moisture into a system is set at 10 ppm or less, thickness of polychlorotrifluoroethylene 1 is set at 15-100 μm, bonding strength between the case 5 and the cover material 4 is set at 5 kg/25 mm or more, and the cover material 4 is formed of the same multilayered film with the case 5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、電池の構成体に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery component.

【０００２】[0002]

【従来の技術】近年、ノート型パソコンを初めとし、二
次電池の需要が伸びてきている。それに伴い、電池のエ
ネルギ密度向上に対する要求も強まり、電池ケースの軽
量化や薄膜化が求められている。また、形状の多様化も
進んでおり、成形性の向上が期待される。従来の電池を
構成する単位セルの包装ケースには、アルミニウム単体
が用いられている。しかし、金属の電池ケースは重くま
た厚みが厚い。また、金属の電池ケースは硬く様々な形
状に成形するのが困難である。2. Description of the Related Art In recent years, demand for secondary batteries, including notebook type personal computers, has been increasing. Along with this, there is a growing demand for an improvement in the energy density of the battery, and there is a demand for a lighter and thinner battery case. In addition, diversification of the shape is progressing, and improvement in moldability is expected. BACKGROUND ART A simple case of aluminum is used for a packaging case of a unit cell constituting a conventional battery. However, metal battery cases are heavy and thick. In addition, metal battery cases are hard and difficult to form into various shapes.

【０００３】[0003]

【発明が解決しようとする課題】本発明は金属単一の電
池ケースに替わり、軽量で薄く、成形性が向上した電池
ケースを使用した電池を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery using a battery case which is lightweight, thin and has improved moldability, instead of a single metal battery case.

【０００４】[0004]

【課題を解決するための手段】本発明は、電池構成材料
である正負極とそこに注入された電解液を封入するケー
スとフタ材からなる電池であって、ケースが、外層はポ
リクロロトリフルオロエチレンであり、内層がヒートシ
ール性を有するシーラントからなり、成形後にAl蒸着を
行い、Al蒸着層の厚みが0.1〜5μｍである電池である。
より好ましくは、電池ケースのバリア性が、60℃・168時
間放置後、電解液減少率が0.5%以下であり、かつ系内へ
の水分増加率が10ppm以下であり、ポリクロロトリフル
オロエチレンの厚みが15〜100μｍであり、ケースとフ
タ材の接着強度が5kg/25mm以上であり、フタ材はケース
と同一多層フィルムである電池である。SUMMARY OF THE INVENTION The present invention relates to a battery comprising a positive electrode and a negative electrode which are constituent materials of a battery, a case for enclosing an electrolyte injected therein, and a lid material, wherein the case has an outer layer of polychlorotrichloride. The battery is a fluoroethylene, in which the inner layer is made of a sealant having a heat sealing property, Al is deposited after molding, and the thickness of the Al deposited layer is 0.1 to 5 μm.
More preferably, the barrier property of the battery case, after standing at 60 ° C. for 168 hours, the electrolyte reduction rate is 0.5% or less, and the water increase rate in the system is 10 ppm or less, and polychlorotrifluoroethylene is used. The battery has a thickness of 15 to 100 μm, an adhesive strength between the case and the lid material of 5 kg / 25 mm or more, and the lid material is the same multilayer film as the case.

【０００５】[0005]

【発明の実施の形態】本発明に用いられるAl蒸着層の厚
みは、0.1〜5μｍ、より好ましくは1〜2μｍである。厚
みが0.1μｍ未満では、Al蒸着層にピンホールが生じ
る。厚みが5μｍを超えると、蒸着するのが困難にな
る。本発明に用いられる電池ケースのバリア性は、60℃
・168時間放置後、電解液減少率が0.5%以下であり、かつ
系内への水分増加率が10ppm以下である。電解液減少率
が0.5%を超えると電池容量が低下し信頼性が落ちてしま
う。水分増加率が10ppmを超えると、Liイオンと水分が
化合し充放電特性が劣化する。本発明に用いられるポリ
クロロトリフルオロエチレンの厚みは15〜100μｍ、よ
り好ましくは、20〜50μｍである。厚みが15μｍ未満で
は、成形が困難になる。厚みが100μｍを超えると、多
層フィルムが200μｍより大きくなり、従来の金属単一
ケースの厚みと同等になり、本発明のメリットかなくな
る。本発明に用いられるケースとフタ材の接着強度は5k
gf/25mm以上である。接着強度が5kgf/25mm未満では、内
圧によりケースが破壊され液漏れによる危険が生じる。BEST MODE FOR CARRYING OUT THE INVENTION The thickness of an Al vapor-deposited layer used in the present invention is from 0.1 to 5 μm, more preferably from 1 to 2 μm. When the thickness is less than 0.1 μm, pinholes are generated in the Al vapor-deposited layer. If the thickness exceeds 5 μm, it becomes difficult to deposit. The barrier property of the battery case used in the present invention is 60 ° C.
-After standing for 168 hours, the rate of decrease in the electrolyte is 0.5% or less, and the rate of increase in water in the system is 10 ppm or less. If the rate of decrease in the electrolyte exceeds 0.5%, the battery capacity is reduced and reliability is reduced. If the rate of increase in water exceeds 10 ppm, Li ions and water combine to deteriorate charge / discharge characteristics. The thickness of the polychlorotrifluoroethylene used in the present invention is 15 to 100 μm, more preferably 20 to 50 μm. If the thickness is less than 15 μm, molding becomes difficult. When the thickness exceeds 100 μm, the thickness of the multilayer film becomes larger than 200 μm, which is equivalent to the thickness of the conventional single metal case, and the advantages of the present invention are not obtained. The adhesive strength between the case and the lid material used in the present invention is 5k
gf / 25mm or more. If the adhesive strength is less than 5 kgf / 25 mm, the case is destroyed by the internal pressure, and there is a danger of liquid leakage.

【０００６】[0006]

【実施例】以下の実施例で本発明を説明するが、これは
単なる例示であり本発明はこれに限定されるものではな
い。図1に示した多層フィルムを、ドライラミネート法
により製膜し、冷間成形により成形を行い、Al蒸着を行
い、同種の多層フィルムシートでシールを行い、図2に
示した電池ケースを得た。得られた電池ケースの重量測
定を行い、中に電解液を2.6〜2.8g入れ、60℃・168時間
放置後の電解液減少率と水分増加率の測定を行った。実
施例及び比較例の電池ケース構成と測定結果を表１,２
に示す。 注 PET：ポリエチレンテレフタレート PCTFE：ポリクロロトリフルオロエチレンThe present invention will be described in the following examples, which are merely illustrative and not restrictive. The multilayer film shown in FIG. 1 was formed by a dry lamination method, formed by cold forming, subjected to Al deposition, sealed with a multilayer film sheet of the same type, and obtained the battery case shown in FIG. . The weight of the obtained battery case was measured, 2.6 to 2.8 g of the electrolytic solution was put therein, and the rate of decrease in the electrolytic solution and the rate of increase in water after standing at 60 ° C. for 168 hours were measured. Tables 1 and 2 show the battery case configurations and measurement results of Examples and Comparative Examples.
Shown in Note PET: Polyethylene terephthalate PCTFE: Polychlorotrifluoroethylene

【０００７】（実施例1）外層のフィルムに厚み30μｍ
のPCTFEを使用し、0.2μｍのAl蒸着を行い、接着強度が
6.5kg/25mmとなるシールを行った。 （実施例2）外層のフィルムに厚み35μｍのPCTFEを使用
し、0.5μｍのAl蒸着を行い、接着強度が6.5kg/25mmと
なるシールを行った。 （実施例3）外層のフィルムに厚み45μｍのPCTFEを使用
し、3.0μｍのAl蒸着を行い、接着強度が6.5kg/25mmと
なるシールを行った。Example 1 30 μm thick outer layer film
Using PCTFE, perform Al evaporation of 0.2μm,
Sealing to 6.5 kg / 25 mm was performed. (Example 2) PCTFE having a thickness of 35 µm was used for the outer layer film, Al was deposited to a thickness of 0.5 µm, and a seal having an adhesive strength of 6.5 kg / 25 mm was performed. (Example 3) PCTFE having a thickness of 45 µm was used for the outer layer film, Al was deposited to a thickness of 3.0 µm, and a seal having an adhesive strength of 6.5 kg / 25 mm was performed.

【０００８】（比較例1）外層のフィルムに厚み30μｍ
のPCTFEを使用し、接着強度が6.5kg/25mmとなるシール
を行った。 （比較例2）外層のフィルムに厚み30μｍのPETを使用
し、0.5μｍのAl蒸着を行い、接着強度が6.5kg/25mmと
なるシールを行った。 （比較例3）外層のフィルムに厚み45μｍのPCTFEを使用
し、0.01μｍのAl蒸着を行い、接着強度が6.5kg/25mmと
なるシールを行った。 （比較例4）外層のフィルムに厚み10μｍのPCTFEを使用
し、0.2μｍのAl蒸着を行い、接着強度が6.5kg/25mmと
なるシールを行った。 （比較例5）外層のフィルムに厚み30μｍのPCTFEを使用
し、0.2μｍのAl蒸着を行い、接着強度が1.2kg/25mmと
なるシールを行った。(Comparative Example 1) 30 μm thick outer layer film
Sealing was performed by using PCTFE of which adhesive strength was 6.5 kg / 25 mm. (Comparative Example 2) A 30-μm-thick PET film was used for the outer layer film, and a 0.5-μm-thick Al film was deposited to seal the film so that the adhesive strength was 6.5 kg / 25 mm. (Comparative Example 3) PCTFE having a thickness of 45 µm was used for the outer layer film, Al was deposited to a thickness of 0.01 µm, and a seal having an adhesive strength of 6.5 kg / 25 mm was performed. (Comparative Example 4) PCTFE with a thickness of 10 µm was used for the outer layer film, Al was deposited with a thickness of 0.2 µm, and sealing was performed so that the adhesive strength was 6.5 kg / 25 mm. (Comparative Example 5) PCTFE having a thickness of 30 µm was used for the outer layer film, Al was deposited to a thickness of 0.2 µm, and a seal having an adhesive strength of 1.2 kg / 25 mm was performed.

【０００９】[0009]

【表１】 [Table 1]

【００１０】[0010]

【表２】 [Table 2]

【００１１】[0011]

【発明の効果】本発明によれば、防湿性に優れた、軽量
で薄く、成形性が向上した電池ケースを使用した電池を
提供することができ、近年のエネルギ密度向上や形状の
多様化に対する要求に答えることができる。According to the present invention, it is possible to provide a battery using a battery case which is excellent in moisture proofing, lightweight, thin and has improved moldability. Can answer requests.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明で使用される多層フィルムの層構成を示
す断面図である。FIG. 1 is a cross-sectional view showing a layer structure of a multilayer film used in the present invention.

【図２】本発明の電池ケースを示す断面図である。FIG. 2 is a sectional view showing a battery case of the present invention.

【符号の説明】[Explanation of symbols]

1：ポリクロロトリフルオロエチレン 2：内層（ヒートシーラント層） 3：Al蒸着層 4：フタ材 5：ケース 1: Polychlorotrifluoroethylene 2: Inner layer (heat sealant layer) 3: Al deposition layer 4: Lid material 5: Case

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 電池構成材料である正負極とそこに注入
された電解液を封入するケースとフタ材からなる電池で
あって、ケースが、外層はポリクロロトリフルオロエチ
レンであり、内層はヒートシール性を有するシーラント
からなり、成形後にＡｌ蒸着を行い、Ａｌ蒸着層の厚み
が0.1〜5μｍであることを特徴とする電池。1. A battery comprising: a positive / negative electrode which is a battery constituent material; a case for enclosing an electrolyte injected therein; and a lid material, wherein the outer layer is made of polychlorotrifluoroethylene, and the inner layer is made of heat. A battery comprising a sealant having a sealing property, wherein Al is vapor-deposited after molding, and a thickness of an Al-deposited layer is 0.1 to 5 μm. 【請求項２】 ６０℃・１６８時間放置後、電解液減少
率が０．５％以下であり、かつ系内への水分増加率が１
０ppm以下であり、ポリクロロトリフルオロエチレンの
厚みが１５〜１００μｍであり、ケースとフタ材の接着
強度が５kg/２５mm以上であり、フタ材はケースと同一
多層フィルムである請求項１記載の電池。2. After leaving at 60 ° C. for 168 hours, the rate of decrease of the electrolyte is 0.5% or less and the rate of increase of water in the system is 1%.
2. The battery according to claim 1, wherein the battery is 0 ppm or less, the thickness of the polychlorotrifluoroethylene is 15 to 100 μm, the adhesive strength between the case and the lid material is 5 kg / 25 mm or more, and the lid material is the same multilayer film as the case. .