JPH0719088Y2 - Thin battery - Google Patents
Thin batteryInfo
- Publication number
- JPH0719088Y2 JPH0719088Y2 JP1986007426U JP742686U JPH0719088Y2 JP H0719088 Y2 JPH0719088 Y2 JP H0719088Y2 JP 1986007426 U JP1986007426 U JP 1986007426U JP 742686 U JP742686 U JP 742686U JP H0719088 Y2 JPH0719088 Y2 JP H0719088Y2
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- battery
- current collector
- negative electrode
- active material
- 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.)
- Expired - Lifetime
Links
Classifications
-
- Y02E60/12—
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は電池、特に薄型電池に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a battery, particularly a thin battery.
（従来技術） 電池は電極活物質合剤と電極板としての導電性材料との
組合わせにより構成されている。この場合、電極活物質
合剤と電極板との間に電気的接触抵抗が生じるが、これ
をできるだけ低くすることが電池の分極特性、就中、放
電容量を上げることにつながる。接触抵抗の低下は接触
面積の増大、接触荷重の増大等によりなし得るが、電池
の薄型化が進行している現在、これが十分になされない
事が起こる。(Prior Art) A battery is composed of a combination of an electrode active material mixture and a conductive material as an electrode plate. In this case, an electrical contact resistance occurs between the electrode active material mixture and the electrode plate, but making it as low as possible leads to an increase in the polarization characteristics of the battery, and in particular to an increase in the discharge capacity. Although the contact resistance can be reduced by increasing the contact area, increasing the contact load, etc., this may not be done sufficiently in the current progress of thinner batteries.
例えば、通常コイン型電池と呼ばれる範疇の電池におい
ては第７図および第８図に示すような方法で電池活物質
と電極板との集電を行なっている。第７図において、負
極活物質（１）は電極板（４）に担持され、電極板
（４）は負極缶（５）とＡなる個所でスポット溶接され
ている。正極活物質（２）も正極缶（６）とＢなる個所
でスポット溶接されている。（３）はセパレータ、
（７）がシールパッキンである。第８図において、集電
体（８）はパンチメタル、ネット、エクスパンドメタル
などが用いられている。これら集電体と活物質が圧着さ
れ、集電されている。コイン型電池の厚みは通常1.0mm
以上有し、内部にこのような集電体を入れても、活物質
及び電解質の入る空間は充分あるため、問題とならな
い。しかし、電池をより薄く作製しようとした場合、電
池内部へ集電体を入れると、活物質の入る空間はほとん
どなく、集電体は使用しないか、使用しても非常に薄い
形状のものでなければならない。また、薄型形状にした
場合、コイン型電池のようにカシメ技術によって、活物
質と電極板を圧接できないため、集電が非常にむずかし
い。For example, in a battery in a category usually called a coin battery, current is collected between the battery active material and the electrode plate by the method shown in FIGS. 7 and 8. In FIG. 7, the negative electrode active material (1) is carried on the electrode plate (4), and the electrode plate (4) is spot-welded with the negative electrode can (5) at a position A. The positive electrode active material (2) is also spot welded to the positive electrode can (6) at a position B. (3) is a separator,
(7) is a seal packing. In FIG. 8, the collector (8) is made of punched metal, net, expanded metal, or the like. The current collector and the active material are pressure-bonded to each other to collect current. The thickness of a coin cell battery is usually 1.0 mm
Having the above, even if such a current collector is placed inside, there is sufficient space for the active material and the electrolyte, so that there is no problem. However, if you try to make the battery thinner, if you put a current collector inside the battery, there is almost no space for the active material, and either the current collector is not used, or the shape is very thin even if it is used. There must be. Further, in the case of a thin shape, current collection is very difficult because the active material and the electrode plate cannot be pressed by the crimping technique like a coin battery.
薄型電池の集電方法としては、厚さに制限があるため第
９図に示すように正、負の活物質（11）、（10）と正、
負の電極板（14）、（13）を直接接触するか、あるいは
第10図に示すようにカーボン等の弾性体の導電材（16）
を設けて集電している。しかし、このような方法では接
触面積が小さく充分な集電効果は上がらない。As a method of collecting current for thin type batteries, there is a limit to the thickness, so as shown in FIG. 9, positive and negative active materials (11), (10) and positive,
Directly contact the negative electrode plates (14) and (13), or, as shown in FIG. 10, an elastic conductive material (16) such as carbon.
Is installed to collect electricity. However, in such a method, the contact area is small and a sufficient current collecting effect cannot be obtained.
（考案の目的） 本考案は薄型電池の集電効果を上げることを目的とす
る。(Object of the Invention) The present invention aims to improve the current collecting effect of a thin battery.
（考案の構成） 即ち、本考案は正極板、該正極板に接しかつ微細突起お
よび微細突起孔を正極板の反対側に設けた金属箔シート
の正極集電体、該正極集電体の突起面で接する正極合
剤、正極と負極を分離するセパレーター、該セパレータ
ーで正極と分離された負極合剤、該負極合剤と接する面
に微細突起および微細突起口を設けた金属箔シートの負
極集電体、該負極集電体と接する負極板の順に構成され
封口材で封止された薄型電池を提供する。(Structure of the Invention) That is, the present invention relates to a positive electrode plate, a positive electrode current collector of a metal foil sheet in contact with the positive electrode plate and provided with fine protrusions and fine protrusion holes on the opposite side of the positive electrode plate, and a protrusion of the positive electrode current collector. A positive electrode mixture which is in contact with the surface, a separator which separates the positive electrode and the negative electrode, a negative electrode mixture which is separated from the positive electrode by the separator, and a negative electrode collection of a metal foil sheet which is provided with fine protrusions and fine protrusion ports on the surface in contact with the negative electrode mixture. Provided is a thin battery in which an electric body and a negative electrode plate in contact with the negative electrode current collector are arranged in this order and sealed with a sealing material.
本考案により微細突起孔を設けた金属箔シートの断面図
を第１図に示す。A cross-sectional view of a metal foil sheet provided with fine projection holes according to the present invention is shown in FIG.
本考案によれば、金属箔上に設ける微細突起および微細
突起孔が電池活物質に食い込み、集電効果が向上する。
微細突起および微細突起孔は針状物質による押圧、研摩
粉による押圧、プレス等種々の方法により行われる。金
属箔が押圧により破れて微細突起孔を形成した方が、接
触面積が増大し、好ましい。According to the present invention, the fine protrusions and the fine protrusion holes provided on the metal foil bite into the battery active material to improve the current collecting effect.
The fine protrusions and fine protrusion holes are formed by various methods such as pressing with a needle-shaped substance, pressing with abrasive powder, and pressing. It is preferable that the metal foil is broken by pressing to form fine projection holes because the contact area is increased.
金属箔を形成する金属はアルミニウム、銅、ステンレス
等の導電体であればよいが、強さおよび防食性の観点か
らステンレス箔が特に好ましい。金属箔の厚みは0,1mm
以下、特に0.05mm以下が好適であり、接触面積を増大す
るために突起まはた突起孔の数は多い方が好ましい。通
常、突起部の数は１平方センチ当り、10〜100個、好ま
しくは30〜80個程度である。The metal forming the metal foil may be a conductor such as aluminum, copper or stainless, but stainless foil is particularly preferable from the viewpoint of strength and corrosion resistance. Thickness of metal foil is 0.1 mm
In the following, it is particularly preferably 0.05 mm or less, and it is preferable that the number of projections or projection holes is large in order to increase the contact area. Usually, the number of protrusions is about 10 to 100, preferably about 30 to 80 per 1 cm 2.
本考案の集電体は電池間接続電極として用いてもよい。
また、本考案の集電体は従来用いられている全ての電池
に応用することができ、電極活物質、電解液等の種類に
左右されない。The current collector of the present invention may be used as an inter-battery connecting electrode.
Further, the current collector of the present invention can be applied to all conventionally used batteries, and is not affected by the types of electrode active material, electrolytic solution and the like.
（考案の効果） 本考案により得られた薄型電池は集電効率が高い。特
に、薄型電池で曲げが発生した状態でも高い集電効率が
得られる。(Effect of the Invention) The thin battery obtained by the present invention has a high current collecting efficiency. In particular, high current collection efficiency can be obtained even in a bent state in a thin battery.
（実施例） 本考案を実施例により詳細に説明する。(Examples) The present invention will be described in detail with reference to Examples.
実施例１ 0.02mmのステンレス箔に0.5mm径の針で１平方センチ当
り50個の破断穴を片面に突起が生ずるように作製した。
突起部分を含めた厚みは0.10mmであった。これを10mm径
に切りとり0.05mmのステンレス箔にスポット溶接した。Example 1 A stainless steel foil having a diameter of 0.02 mm was formed with a needle having a diameter of 0.5 mm so that 50 breaking holes per 1 cm 2 were formed so that protrusions were formed on one surface.
The thickness including the protrusion was 0.10 mm. This was cut into a 10 mm diameter and spot-welded to a 0.05 mm stainless steel foil.
次に、β−MnO2に導電剤としてアセチレンブラック、粘
結剤としてテフロン粉末を混ぜ、正極活物質合剤とし
て、錠剤成型機で10mm径、厚み0.25mmのものを作製し
た。次に、10mm径、厚み0.1mmのリチウム金属を負極活
物質とした。セパレータに厚み0.1mmのポリプロピレン
不織布を用い、電解液としてプロピレンカーボネートと
ジメトキシエタンの混合溶媒１に１モルの過塩素酸リ
チウムを溶かしたものを用いた。これらを用いて、第２
図に示すような電池を構成した。第２図において（21）
は負極活物質であるリチウム金属（22）は正極合剤、
（23）はセパレータ、（24）は本考案による集電体、
（25）は負極板、（26）は正極板、（27）は封口板であ
る。この電池の厚みは0.60mmであった。これを不活性雰
囲気で100μＡの電流で放電し、放電特性を測定した。
その結果を第３図のＡに示す。Next, β-MnO 2 was mixed with acetylene black as a conductive agent and Teflon powder as a binder to prepare a positive electrode active material mixture having a diameter of 10 mm and a thickness of 0.25 mm by a tablet molding machine. Next, lithium metal having a diameter of 10 mm and a thickness of 0.1 mm was used as a negative electrode active material. A polypropylene non-woven fabric having a thickness of 0.1 mm was used as a separator, and an electrolyte prepared by dissolving 1 mol of lithium perchlorate in a mixed solvent 1 of propylene carbonate and dimethoxyethane was used. With these, the second
A battery as shown in the figure was constructed. In Fig. 2 (21)
Is a negative electrode active material lithium metal (22) is a positive electrode mixture,
(23) is a separator, (24) is a current collector according to the present invention,
(25) is a negative plate, (26) is a positive plate, and (27) is a sealing plate. The thickness of this battery was 0.60 mm. This was discharged at a current of 100 μA in an inert atmosphere, and the discharge characteristics were measured.
The result is shown in A of FIG.
比較例１ 実施例１に使用した本考案による集電体を用いず電池を
構成した。電池の構成材料は実施例１に同じである。こ
の電池の厚みは0.55mmであった。これを不活性雰囲気で
100μＡの電流で放電し、放電特性を測定した。その結
果を第３図のＢに示す。Comparative Example 1 A battery was constructed without using the current collector according to the present invention used in Example 1. The constituent material of the battery is the same as in Example 1. The thickness of this battery was 0.55 mm. In an inert atmosphere
The battery was discharged at a current of 100 μA and the discharge characteristics were measured. The result is shown in FIG. 3B.
比較例２ 厚み0.07mm厚のステンレスメッシュを集電体に用い、電
池を構成した。電池の構成材料は実施例１に同じであ
る。この電池の厚みは0.70mmであった。これを不活性雰
囲気で100μＡの電流で放電し、放電特性を測定した。
その結果を第３図のＣに示す。Comparative Example 2 A battery was constructed using a 0.07 mm thick stainless mesh as a current collector. The constituent material of the battery is the same as in Example 1. The thickness of this battery was 0.70 mm. This was discharged at a current of 100 μA in an inert atmosphere, and the discharge characteristics were measured.
The result is shown in C of FIG.
第３図の結果より本考案による方法によるもの放電特性
は向上し、放電容量は多くなった。比較例による方法に
比べ、集電体の突起部分が、活物質に食い込み、集電効
果をあげていると判断出来る。From the results shown in FIG. 3, the discharge characteristics were improved and the discharge capacity was increased by the method according to the present invention. It can be judged that the protruding portion of the current collector digs into the active material to increase the current collecting effect, as compared with the method according to the comparative example.
次に本考案による集電体を固体電池に用いた場合につい
て説明する。Next, the case where the current collector according to the present invention is used in a solid-state battery will be described.
実施例２ 厚み0.02mmのステンレス箔に0.5mm径の針で１平方セン
チ当り70個の破断穴を片面に突起が生ずるように作製し
た。突起部分を含めた厚みは0.10mmであった。これを10
mm径に切りとり0.05mmのステンレス箔にスポット溶接し
た。次に水素貯蔵合金であるTiNiMm合金0.01gを水素化
し粉末化したものに固体電解質、結着剤であるカルボキ
シメチルセルローズ、導電剤であるアセチレンブラック
粉末を混ぜ、負極合剤とした。これを錠剤成型機で10mm
径、厚み0.3mmのペレットにした。固体電解質には五酸
化アンチモンを用いてこれを10mm径、厚み0.2mmのペレ
ットにした。正極合剤はγ−MnO2にアセチレンブラッ
ク、カルボキシメチルセルローズ、固体電解質を用いこ
れを混合し10mm径、厚み0.4mmのペレットにした。これ
らを用いて、第４図に示す電池を構成した。この電池の
厚みは1.05mmであった。第４図において（31）は負極合
剤、（32）は正極合剤、（33）は固体電解質、（34）は
負極板、（35）は正極板、（36）は本考案による集電
体、（37）は封口材である。この電池を75μA/cm2の電
流密度で充放電を行なった。その結果を第５図のＡに示
す。Example 2 A stainless steel foil having a thickness of 0.02 mm was manufactured with a needle having a diameter of 0.5 mm so that 70 breaking holes per square centimeter were formed so that protrusions were formed on one surface. The thickness including the protrusion was 0.10 mm. This 10
It was cut to a diameter of mm and spot-welded to a stainless steel foil of 0.05 mm. Next, 0.01 g of a TiNiMm alloy, which is a hydrogen storage alloy, was hydrogenated and powdered, and a solid electrolyte, carboxymethyl cellulose that was a binder, and acetylene black powder that was a conductive agent were mixed to obtain a negative electrode mixture. This is 10mm with a tablet molding machine
Pellets with a diameter and thickness of 0.3 mm. Antimony pentoxide was used as the solid electrolyte, and this was made into pellets with a diameter of 10 mm and a thickness of 0.2 mm. As the positive electrode mixture, γ-MnO 2 was mixed with acetylene black, carboxymethyl cellulose and a solid electrolyte, which were mixed to form pellets having a diameter of 10 mm and a thickness of 0.4 mm. Using these, the battery shown in FIG. 4 was constructed. The thickness of this battery was 1.05 mm. In FIG. 4, (31) is a negative electrode mixture, (32) is a positive electrode mixture, (33) is a solid electrolyte, (34) is a negative electrode plate, (35) is a positive electrode plate, and (36) is a current collector according to the present invention. The body, (37), is a sealing material. This battery was charged and discharged at a current density of 75 μA / cm 2 . The result is shown in A of FIG.
比較例３ 実施例２に使用した本考案による集電体を用いず電池を
構成した。電池の構成材料は実施例２と同じである。こ
の電池の厚みは1.0mmであった。この電池を75μA/cm2の
電流密度で充放電を行なった。その結果を第５図のＢに
示す。Comparative Example 3 A battery was constructed without using the current collector according to the present invention used in Example 2. The constituent material of the battery is the same as that of the second embodiment. The thickness of this battery was 1.0 mm. This battery was charged and discharged at a current density of 75 μA / cm 2 . The result is shown in FIG. 5B.
第５図の結果より、本考案の集電体を用いることによっ
て電池の厚みを増すことなく、集電効果をあげられる。
また、第６図に示すように金属箔両面に突起が生ずるよ
うにして用いた場合は単電池の接続電極として用いるこ
とが出来る。電池活物質が金属箔集電体に対して腐食作
用がある場合、集電体表面を導電性カーボンペーストで
被覆したものも、集電体としてすぐれた効果を発揮す
る。From the results shown in FIG. 5, by using the current collector of the present invention, the current collecting effect can be enhanced without increasing the thickness of the battery.
Moreover, as shown in FIG. 6, when it is used so that protrusions are formed on both surfaces of the metal foil, it can be used as a connecting electrode of a single cell. When the battery active material has a corrosive action on the metal foil current collector, a current collector whose surface is coated with a conductive carbon paste also exhibits excellent effects as a current collector.
第１図は本考案による集電体の断面図である。 第２図は実施例１で得られた電池の断面図である。 第３図は実施例１および比較例１〜２で得られた電池の
充放電特性を示すグラフである。 第４図は実施例２で得られた固体電池の断面構造図であ
る。 第５図は実施例２および比較例３で得られた電池の放電
特性を示すグラフである。 第６図は本考案の集電体の別の態様を示す断面図であ
る。 第７〜10図は従来のボタン型および薄型電池の断面図で
ある。 図中の番号は以下の通りである： （１）…負極活物質、（２）…正極活物質、（３）…セ
パレータ、（４）…電極板、（５）…負極缶、（６）…
正極缶、（７）…シールパッキン、（８）…集電体、
（10）…負極活物質、（11）…正極活物質、（12）…セ
パレータ、（13）…負極板、（14）…正極板、（15）…
封口体、（16）…導電性材料、（21）…負極活物質、
（22）…正極活物質、（23）…セパレータ、（24）…集
電体、（25）…負極板、（26）…正極板、（27）…封口
材、（31）…負極活物質、（32）…正極活物質、（33）
…固体電解質、（34）…負極板、（35）…正極板、（3
6）…集電体、（37）…封口材。FIG. 1 is a sectional view of a current collector according to the present invention. FIG. 2 is a sectional view of the battery obtained in Example 1. FIG. 3 is a graph showing charge / discharge characteristics of the batteries obtained in Example 1 and Comparative Examples 1 and 2. FIG. 4 is a sectional structural view of the solid-state battery obtained in Example 2. FIG. 5 is a graph showing the discharge characteristics of the batteries obtained in Example 2 and Comparative Example 3. FIG. 6 is a sectional view showing another embodiment of the current collector of the present invention. 7 to 10 are sectional views of conventional button type and thin type batteries. The numbers in the figure are as follows: (1) ... Negative electrode active material, (2) ... Positive electrode active material, (3) ... Separator, (4) ... Electrode plate, (5) ... Negative electrode can, (6) …
Positive electrode can, (7) ... Seal packing, (8) ... Current collector,
(10) ... Negative electrode active material, (11) ... Positive electrode active material, (12) ... Separator, (13) ... Negative electrode plate, (14) ... Positive electrode plate, (15) ...
Sealing body, (16) ... Conductive material, (21) ... Negative electrode active material,
(22) ... Positive electrode active material, (23) ... Separator, (24) ... Current collector, (25) ... Negative electrode plate, (26) ... Positive electrode plate, (27) ... Sealing material, (31) ... Negative electrode active material , (32) ... Positive electrode active material, (33)
… Solid electrolyte, (34)… Negative electrode plate, (35)… Positive electrode plate, (3
6)… Current collector, (37)… Sealant.
Claims (1)
び微細突起孔を正極板の反対側に設けた金属箔シートの
正極集電体、該正極集電体の突起面で接する正極合剤、
正極と負極を分離するセパレーター、該セパレーターで
正極と分離された負極合剤、該負極合剤と接する面に微
細突起および微細突起孔を設けた金属箔シートの負極集
電体、該負極集電体と接する負極板の順に構成され封口
材で封止された薄型電池。1. A positive electrode plate, a positive electrode current collector of a metal foil sheet which is in contact with the positive electrode plate and is provided with fine protrusions and fine protrusion holes on the opposite side of the positive electrode plate, and a positive electrode mixture which is in contact with the protrusion surface of the positive electrode current collector. Agent,
A separator for separating the positive electrode and the negative electrode, a negative electrode mixture separated from the positive electrode by the separator, a negative electrode current collector of a metal foil sheet provided with fine protrusions and fine protrusion holes on the surface in contact with the negative electrode mixture, the negative electrode current collector A thin battery in which a negative electrode plate in contact with the body is formed in order and sealed with a sealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986007426U JPH0719088Y2 (en) | 1986-01-21 | 1986-01-21 | Thin battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986007426U JPH0719088Y2 (en) | 1986-01-21 | 1986-01-21 | Thin battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62120257U JPS62120257U (en) | 1987-07-30 |
| JPH0719088Y2 true JPH0719088Y2 (en) | 1995-05-01 |
Family
ID=30790861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986007426U Expired - Lifetime JPH0719088Y2 (en) | 1986-01-21 | 1986-01-21 | Thin battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0719088Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2752377B2 (en) * | 1988-06-29 | 1998-05-18 | 株式会社リコー | Sheet electrode |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56143773U (en) * | 1980-03-28 | 1981-10-29 |
-
1986
- 1986-01-21 JP JP1986007426U patent/JPH0719088Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62120257U (en) | 1987-07-30 |
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