JPH0494055A - Thin type cell - Google Patents
Thin type cellInfo
- Publication number
- JPH0494055A JPH0494055A JP2211795A JP21179590A JPH0494055A JP H0494055 A JPH0494055 A JP H0494055A JP 2211795 A JP2211795 A JP 2211795A JP 21179590 A JP21179590 A JP 21179590A JP H0494055 A JPH0494055 A JP H0494055A
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- stainless steel
- dew point
- heat
- thin battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 21
- 239000010935 stainless steel Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000004840 adhesive resin Substances 0.000 claims abstract description 5
- 229920006223 adhesive resin Polymers 0.000 claims abstract description 5
- 229920000098 polyolefin Polymers 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 5
- 239000000565 sealant Substances 0.000 claims description 2
- 239000003566 sealing material Substances 0.000 claims description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007789 sealing Methods 0.000 abstract description 8
- 239000012945 sealing adhesive Substances 0.000 abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052744 lithium Inorganic materials 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000011888 foil Substances 0.000 abstract description 2
- 229940126214 compound 3 Drugs 0.000 abstract 1
- ORTFAQDWJHRMNX-UHFFFAOYSA-M oxidooxomethyl Chemical compound [O-][C]=O ORTFAQDWJHRMNX-UHFFFAOYSA-M 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 13
- 230000001070 adhesive effect Effects 0.000 description 13
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は薄形電池の封口に関するものである。[Detailed description of the invention] Industrial applications The present invention relates to the sealing of thin batteries.
従来技術とその問題点
近年、リチウムを負極活物質とするリチウム電池におい
て、厚みが１ＩＩＩＩ１１以下の薄形電池が商品化され
、小形化、薄形化が進む電子機器の分野で注目を集めて
いる。Conventional technology and its problems In recent years, thin lithium batteries with a thickness of 1III11 or less, which use lithium as the negative electrode active material, have been commercialized and are attracting attention in the field of electronic devices, which are becoming smaller and thinner. .
しかし、現在商品化されている薄形電池は、その封口部
の接着力に劣る。これは接着剤と金属の接着面積が少な
く、単位面積当りの結合の数が少ないためである。封口
部に曲げ等の応力が加わらないようにするべく、厚い金
属を用いて封口部を保護している。従って、現行の薄形
電池は、エネルギー密度が低下し、耐透湿性、封口接着
力、柔軟性に劣るという問題点を有していた。However, the thin batteries currently on the market have poor adhesive strength at their sealing parts. This is because the bonding area between the adhesive and the metal is small, and the number of bonds per unit area is small. In order to prevent stress such as bending from being applied to the sealing part, thick metal is used to protect the sealing part. Therefore, current thin batteries have problems in that they have low energy density and are poor in moisture permeability, sealing adhesive strength, and flexibility.
発明の目的
本発明は上記従来の問題点に鑑みなされたものであり、
エネルギー密度及び耐透湿性に優れた、封口接着力の大
きい、柔軟性のある薄形電池を提供することを目的とす
るものである。Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems.
The object of the present invention is to provide a thin, flexible battery that has excellent energy density and moisture permeability, has high sealing adhesive strength, and has excellent sealing adhesive strength.
発明の構成
本発明は上記従来の問題点を解決するべく、集電体兼外
装材である２枚の金属を封口剤を介して接着した薄形電
池において、熱処理された金属を用いたことを特徴とす
る薄形電池である。Structure of the Invention In order to solve the above-mentioned conventional problems, the present invention utilizes heat-treated metal in a thin battery in which two metal sheets serving as a current collector and exterior material are bonded together via a sealant. This is a thin battery with special characteristics.
尚、金属がステンレス鋼である前記の薄形電池である。The thin battery mentioned above is made of stainless steel.
尚、熱処理の露点が一１０℃以上である前記の薄形電池
である。The thin battery described above has a dew point of 110° C. or higher during heat treatment.
尚、封口材がカルボキシル基を有するポリオレフィン系
の接着性樹脂である前記の薄形電池である。Note that this is the above-mentioned thin battery in which the sealing material is a polyolefin-based adhesive resin having a carboxyl group.
尚、熱処理の露点が一１０℃以上で５０℃以下である前
記の薄形電池である。The thin battery described above has a heat treatment dew point of 110° C. or more and 50° C. or less.
本発明者らは鋭意検討を行なった結果、大気中にて金属
を熱処理することによって接着力が増加することを見い
だした。特に金属がステンレス鋼の場合に接着力の増加
が顕著であった。As a result of extensive research, the inventors of the present invention have found that adhesive strength can be increased by heat-treating metal in the atmosphere. In particular, when the metal was stainless steel, the increase in adhesive strength was remarkable.
この接着力の増加の理由は明らかではないが、次に挙げ
る２点が考えられる。Although the reason for this increase in adhesive strength is not clear, the following two points can be considered.
（１）熱処理によって表面の金属が酸化され、スステン
レス調表面の凹凸が大きくなり、アンカー効果などが現
われたため。(1) The metal on the surface was oxidized by heat treatment, and the unevenness of the stainless steel surface became larger, resulting in an anchor effect.
（２）形成された金属酸化物と水蒸気が反応して表面に
水酸基を多く形成したために、単位面積当りのカルボキ
シル基と表面水酸基との結合が増えたため。(2) Because the formed metal oxide and water vapor reacted to form many hydroxyl groups on the surface, the number of bonds between carboxyl groups and surface hydroxyl groups per unit area increased.
上記理由の中で可能性が高い理由は（２）であ。Among the above reasons, the most likely reason is (2).
なぜなら、熱処理時の露点を一３０°Ｃに下げて試験を
行なったところ、逆に接着力が低下するという知見が得
られたためである。このことから、露点が低く水蒸気が
少ない雰囲気では、水酸基が供給されにくく、表面水酸
基の形成が抑制されて接着力が増加しにくいものと考え
られる。This is because when a test was conducted by lowering the dew point during heat treatment to -30°C, it was found that the adhesive strength was reduced on the contrary. From this, it is considered that in an atmosphere with a low dew point and little water vapor, hydroxyl groups are difficult to be supplied, the formation of surface hydroxyl groups is suppressed, and the adhesive strength is difficult to increase.
実施例 以下、本発明の詳細について実施例により説明する。Example Hereinafter, the details of the present invention will be explained with reference to Examples.
接着力を評価するための試験片として、厚み５０μｍの
ステンレス鋼を幅２５ｍｍ長さ１００１に裁断したもの
を準備した。準備したステンレス鋼をアセトンで超音波
洗浄し、脱脂を行なった。次に熱処理は露点を制御でき
る電気炉を用イて、２００°Ｃで３時間行なった。この
時の電気炉内の露点を一３０°Ｃから１００°Ｃまで変
化させて、そのときの接着力の変化を見た。この試験結
果を第１表に示した。比較例としてアセトンで洗浄した
だけで熱処理せずに接着したときの接着力を同時に示し
た。この場合の接着力は、２枚のステンレス鋼の間にカ
ルボキシル基を有するポリオレフィン系の接着性樹脂を
配して、その上下から加熱してヒートシールした試験片
のＴ型剥離試験から求めたものである。As a test piece for evaluating adhesive strength, a piece of stainless steel having a thickness of 50 μm and cut into a piece having a width of 25 mm and a length of 100 mm was prepared. The prepared stainless steel was ultrasonically cleaned with acetone and degreased. Next, heat treatment was carried out at 200° C. for 3 hours using an electric furnace with a controllable dew point. At this time, the dew point in the electric furnace was varied from -30°C to 100°C, and changes in adhesive strength were observed. The test results are shown in Table 1. As a comparative example, the adhesion strength when bonded only after cleaning with acetone and without heat treatment is also shown. The adhesive strength in this case was determined from a T-peel test using a test piece that was heat-sealed by placing a carboxyl group-containing polyolefin adhesive resin between two pieces of stainless steel and heating it from above and below. It is.
Ｔ型剥離試験は、２枚のステンレス鋼の他端を互いに反
対方向に引っ張り、剥離するときの接着力を求めるもの
である。The T-peel test involves pulling the other ends of two pieces of stainless steel in opposite directions and determining the adhesive strength when they are peeled off.
以下余白
第 １ 表
第１表よりの結果より、露点−１０℃以上での熱処理は
、従来の熱処理・無よりも大きな接着力が得られた。From the results shown in Table 1, heat treatment at a dew point of -10° C. or higher resulted in greater adhesive strength than conventional heat treatment or no heat treatment.
一方、露点１５″Ｃの大気中で熱処理温度を変えて熱処
理を行なったところ、熱処理温度１００℃以下では、５
時間以上の熱処理を行なってもほとんど酸化反応が進ま
ず接着力の増加はほとんど認められなかった。逆に熱処
理温度５００℃以上では１０分足らずの間に酸化反応が
進みすぎたためと思われるステンレス鋼の変質が認めら
れた。On the other hand, when heat treatment was carried out at different heat treatment temperatures in the atmosphere with a dew point of 15''C, it was found that when the heat treatment temperature was 100℃ or less,
Even if the heat treatment was performed for more than 1 hour, the oxidation reaction hardly progressed and almost no increase in adhesive strength was observed. On the other hand, when the heat treatment temperature was 500° C. or higher, deterioration of the stainless steel was observed in less than 10 minutes, probably because the oxidation reaction progressed too much.
次に、熱処理をしたステンレス鋼を実際の薄形電池に使
用した場合の特性を評価するために、薄形電池を試作し
透湿試験を行なった。試作した電池の断面図を第１図に
示した。ステンレス鋼は熱処理温度と時間を２００℃、
３時間として、露点を−１０，１０，３０，５０，７５
゜１００″Ｃに変化させて熱処理したものを使用した。Next, in order to evaluate the characteristics when heat-treated stainless steel is used in an actual thin battery, a thin battery was prototyped and a moisture permeability test was conducted. A cross-sectional view of the prototype battery is shown in Figure 1. For stainless steel, the heat treatment temperature and time are 200℃,
3 hours, dew point -10, 10, 30, 50, 75
The material was heat treated at 100"C.
以下に薄形電池の組立について述べる。まず、集電体兼
外装であるステンレス鋼（１゜２）を用意し、アセトン
で洗浄した後、上記熱処理条件で熱処理する。次にそれ
ぞれの条件で熱処理した２枚のステンレス鋼に、各々正
極合剤（３）と負極リチウム箔（４）を載置し、セパレ
ータ（５）を介して積層し、封口部のステンレス鋼の間
にカルボキシル基を有するポリオレフィン系接着性樹脂
を配し、その封口部（６）をヒートシールすることによ
り薄形電池が得られる。The assembly of the thin battery will be described below. First, a stainless steel (1°2) serving as a current collector and exterior is prepared, washed with acetone, and then heat treated under the above heat treatment conditions. Next, a positive electrode mixture (3) and a negative electrode lithium foil (4) are placed on two sheets of stainless steel that have been heat-treated under the respective conditions, and are laminated with a separator (5) in between. A thin battery is obtained by disposing a polyolefin adhesive resin having a carboxyl group therebetween and heat sealing the sealing portion (6).
試作した薄形電池の耐透湿試験は、温度４０°Ｃ１湿度
９０％の恒温恒温炉の中に１０日間保存して、保存後の
放電容量の変化を測定して比較した。The moisture permeation resistance test of the prototype thin battery was performed by storing it in a constant temperature oven at 40° C. and 90% humidity for 10 days, and measuring and comparing the change in discharge capacity after storage.
試験結果を第２図に示した。ステンレス鋼の熱処理時の
露点が５０”Ｃよりも高い場合には、なんらかの原因で
水分が電池内に浸透し、放電容量を劣化させることが判
った。The test results are shown in Figure 2. It has been found that if the dew point of stainless steel during heat treatment is higher than 50''C, moisture will penetrate into the battery for some reason, degrading the discharge capacity.
これらのことから、熱処理時の露点は−１０から５０°
Ｃが適当であるといえる。From these reasons, the dew point during heat treatment is -10 to 50°.
It can be said that C is appropriate.
一方、熱処理温度に関しては１００”Ｃ以下では反応が
進みにくく、また５００°Ｃ以上では反応が進みすぎ制
御がしにくくステンレス鋼が変質してしまうため１００
℃から５００°Ｃで熱処理することが望ましいが、熱処
理時間の制御をうまく行えれば、５００°Ｃ以上の高温
でも処理が可能であるため前記範囲に限定するものでは
ない。On the other hand, regarding the heat treatment temperature, if the temperature is below 100"C, the reaction will not proceed smoothly, and if it is above 500"C, the reaction will proceed too much and will be difficult to control, resulting in deterioration of the stainless steel.
Although it is preferable to perform the heat treatment at a temperature of 500°C to 500°C, the temperature is not limited to the above range because the treatment can be performed at a high temperature of 500°C or higher if the heat treatment time is well controlled.
なお、本実施例では熱処理を恒温恒温炉で行なったが熱
処理方法はこれだけに限定されるものではなく、露点を
コントロールした空気をステンレス鋼に吹き付けたり、
露点をコントロールした室内で開放型の炉の中をステン
レス鋼を通したり、さらには封口部以外をマスキングし
て熱処理してもよい。Note that in this example, the heat treatment was performed in a constant-temperature furnace, but the heat treatment method is not limited to this, and may include blowing air with a controlled dew point onto the stainless steel,
Heat treatment may be performed by passing the stainless steel through an open furnace in a room with a controlled dew point, or by masking the parts other than the sealed part.
発明の効果
上述した如く、本発明はエネルギー密度及び耐透湿性に
優れた、封口接着力の大きい、柔軟性のある薄形電池を
提供することが出来るので、その工業的価値は極めて大
である。Effects of the Invention As described above, the present invention can provide a flexible thin battery with excellent energy density and moisture permeation resistance, strong sealing adhesive strength, and therefore has extremely great industrial value. .
第１図は本発明の薄形電池の断面図、第２図は露点と放
電容量の関係を示したものである。FIG. 1 is a sectional view of the thin battery of the present invention, and FIG. 2 shows the relationship between dew point and discharge capacity.
Claims (5)
て接着した薄形電池において、熱処理された金属を用い
たことを特徴とする薄形電池。(1) A thin battery in which two metal sheets serving as current collectors and exterior materials are bonded together via a sealant, characterized in that heat-treated metal is used.
池。(2) The thin battery according to claim 1, wherein the metal is stainless steel.
の薄形電池。(3) The thin battery according to claim 1, wherein the dew point of the heat treatment is -10°C or higher.
系の接着性樹脂である請求項１記載の薄形電池。(4) The thin battery according to claim 1, wherein the sealing material is a polyolefin adhesive resin having a carboxyl group.
請求項３記載の薄形電池。(5) The thin battery according to claim 3, wherein the dew point of the heat treatment is -10°C or higher and 50°C or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211795A JPH0494055A (en) | 1990-08-09 | 1990-08-09 | Thin type cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2211795A JPH0494055A (en) | 1990-08-09 | 1990-08-09 | Thin type cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0494055A true JPH0494055A (en) | 1992-03-26 |
Family
ID=16611735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2211795A Pending JPH0494055A (en) | 1990-08-09 | 1990-08-09 | Thin type cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0494055A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388908B1 (en) * | 2000-10-16 | 2003-06-25 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| CN109585904A (en) * | 2017-09-29 | 2019-04-05 | 辉能科技股份有限公司 | Bendable lithium battery |
-
1990
- 1990-08-09 JP JP2211795A patent/JPH0494055A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388908B1 (en) * | 2000-10-16 | 2003-06-25 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| CN109585904A (en) * | 2017-09-29 | 2019-04-05 | 辉能科技股份有限公司 | Bendable lithium battery |
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