JPS5857271A - Flat type organic solvent battery - Google Patents
Flat type organic solvent batteryInfo
- Publication number
- JPS5857271A JPS5857271A JP15567381A JP15567381A JPS5857271A JP S5857271 A JPS5857271 A JP S5857271A JP 15567381 A JP15567381 A JP 15567381A JP 15567381 A JP15567381 A JP 15567381A JP S5857271 A JPS5857271 A JP S5857271A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- sectional area
- battery
- positive electrode
- cross
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Primary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
本1iIIIlは扁平形状O有機溶媒電池、更に坪しく
は、放電し九とIiの総高変化が極めて小さく、かつ、
放電特性に優れた扁平瀝有機涛媒電池に関する。Detailed Description of the Invention The present 1iIIIl is a flat-shaped O organic solvent battery, and more particularly, the total height change of 9 and Ii during discharge is extremely small, and
This invention relates to a flat organic hydrant battery with excellent discharge characteristics.
有機SS電池はエネルギー51度が高く、広範な@直領
域で操作で亀、を九貯賊特性にt優れている丸め、現在
、電卓、時計、メモリーのパッタアツfIK源畳に広く
使用されている。Organic SS batteries have a high energy of 51 degrees, can be operated in a wide range of direct ranges, have excellent storage characteristics, and are currently widely used in calculators, watches, and memory devices. .
この有機am電mは1通常、図−示したよりな構造にな
りて−る。gは、扁平瀝有機溶媒電池のIIMIを示す
縦断面一である。図にお−で、l嬬正極合剤で、SV系
の電池では一般に二酸化マンガン(MnO,) 7フ化
#l素((CFx)n)、1.5V系の電池では酸化ビ
スv x (B is Om )、酸化銅(Cub)、
硫化鉄(F@8)、二硫化鉄(Fogm)等の正極活物
質の着京を、黒鉛、カー−ノックツク等の導電材の粉末
及び、ぼりテトラフーロエチレン等の結着剤の粉末と混
合し九後、所定断面積(S、)を有するペレツtKjl
形し九ものが用いられて−る。The organic ammonium hydroxide usually has the structure shown in the figure. g is a longitudinal section showing IIMI of a flat organic solvent battery. In the figure, the positive electrode mixture generally contains manganese dioxide (MnO,) 7 fluoride ((CFx)n) in SV type batteries, and bis oxide v x ((CFx)n) in 1.5V type batteries. B is Om), copper oxide (Cub),
Mixing of cathode active materials such as iron sulfide (F@8) and iron disulfide (Fogm) with conductive material powders such as graphite and Kernock, and binder powders such as Bori Tetrafluoroethylene. After that, pellets tKjl with a predetermined cross-sectional area (S, )
Nine shapes are used.
2は負極で1通常は所足断向積(Sm)を有する金属リ
チウムの円板が用−られる。正極合剤lと金属リチウム
の負極2は、グロビレンカーlネート。Reference numeral 2 denotes a negative electrode, and 1 is usually a circular plate of metallic lithium having a sufficient shear area (Sm). The negative electrode 2 of the positive electrode mixture 1 and metallic lithium is globylene carnate.
r−ブチロラクトン、ジメトキシエタン勢O有機醪媒に
過m素駿Vテクム、ホクフク化すテクム尋の電解質t−
溶解して成る有機電解液が保持されたセパレータ3を介
して尚接されている。このようにして、正極合剤、セパ
レータ、負極をこの順序で積層し良ものを発電要素と呼
ぶ。r-Butyrolactone, dimethoxyethane-based organic mortar, permium, and electrolyte T-
It is still in contact with a separator 3 in which a dissolved organic electrolyte is held. In this way, a positive electrode mixture, a separator, and a negative electrode are laminated in this order, and a good product is called a power generation element.
この発電要素線、正極合剤lを下にして、正極端子も兼
ねる金属製(例えばステンレススティール)の電池ケー
ス4の中に収納され、負@0上からは負極端子も兼ね、
その開口部の内側が所定の断面積(8s)を有する金属
製(例えばステンレススティール)の負極封口板5が冠
着される。負極封口板50周縁部は、電気絶縁性のガス
ケツ)(Nえば硬質シム)6を介して電池ケース4の開
口部を気密に封印している0通常、全体の形状は一一ン
状であゐ。This power generating element wire is housed in a metal (for example, stainless steel) battery case 4 which also serves as a positive terminal, with the positive electrode mixture l facing down, and from above the negative @0 also serves as a negative terminal.
A negative electrode sealing plate 5 made of metal (for example, stainless steel) having a predetermined cross-sectional area (8s) is attached to the inside of the opening. The peripheral edge of the negative electrode sealing plate 50 airtightly seals the opening of the battery case 4 via an electrically insulating gasket (hard shim) 6. Usually, the overall shape is a line-shaped one. Wow.
このような有機溶媒電池は、従来から広く使用されてい
る銀電池、水錯電池等に比べてもその放電特性は遜色の
ない程に安定しており、しかも安価に調造できるため、
現在上記した従来電池の代替品として広く注目を集めて
いる。These organic solvent batteries have stable discharge characteristics comparable to those of conventionally widely used silver batteries, water complex batteries, etc., and can be prepared at low cost.
Currently, it is attracting wide attention as an alternative to the conventional batteries mentioned above.
ところで、上記した有機m媒電池にあっては、放電が進
行するとそれに伴い電池内部では、■負極である金属リ
チウムが電解故に漸次溶解し、その厚みを漸減する。■
一方、正極合剤は体積膨張して、その厚みが増大すると
いう現象が進む。By the way, in the above-mentioned organic m-medium battery, as discharge progresses, inside the battery, (1) the metal lithium, which is the negative electrode, gradually dissolves due to electrolysis, and its thickness gradually decreases. ■
On the other hand, the positive electrode mixture expands in volume and increases in thickness.
したがって1両者の現象がバランスしない場合には、負
極と正極合剤との接触不良が起生ずる(■の現象が■の
現象よりも速やかに進行する場合)か、又は、正極合剤
の体積膨張によって電池の総高が増大する(■の現象が
■の現象を凌駕する場合)ことになる。Therefore, if the two phenomena are not balanced, poor contact between the negative electrode and the positive electrode mixture will occur (if the phenomenon of ■ progresses more quickly than the phenomenon of ■), or the volume expansion of the positive electrode mixture will occur. Therefore, the total height of the battery increases (if the phenomenon of ■ exceeds the phenomenon of ■).
一般には、正極合剤の体積膨張に基づく厚みの増大は負
極の厚み減少よりも著しく大きいので、電池総高が増大
し、放電終了時においては所定の寸法規格t−超過して
しまう、このことは、電池の放電容量の低下、放電特性
の不安定化を招いてい友。Generally, the increase in thickness due to volume expansion of the positive electrode mixture is significantly greater than the decrease in the thickness of the negative electrode, so the total height of the battery increases and exceeds the predetermined dimensional standard t- at the end of discharge. This results in a decrease in the battery's discharge capacity and destabilization of its discharge characteristics.
本発@省らは、扁平型有機溶媒taのうち、正極活物質
が二硫化鉄で、負極か金属リチウムである扁平型有機溶
媒電池における上記し九欠点を解消するために鋭意研究
を重ねた結果、正極含銅lO断面積S1、負極20断面
積8■及び負極封口板5の開口部の内側断面積SSが相
互に所定の関係を結ぶとき、上記した■と■の現象がバ
ランスして電池総高変化が極めて小さくなり、かつ放電
特性も優れるとの事興を見出し、本発明を完成する#/
cW4り九。This project@Ministry and colleagues have conducted intensive research to eliminate the above-mentioned nine drawbacks of flat organic solvent batteries in which the positive electrode active material is iron disulfide and the negative electrode is metallic lithium. As a result, when the positive electrode copper-containing IO cross-sectional area S1, the negative electrode 20 cross-sectional area 8■, and the inner cross-sectional area SS of the opening of the negative electrode sealing plate 5 form a predetermined relationship, the above-mentioned phenomena ■ and ■ are balanced. They discovered that the change in total battery height is extremely small and the discharge characteristics are excellent, and completed the present invention.
cW4ri9.
本発明は、電池の総高変化が極めて小さく、かつ放電特
性にも優れる側平蓋有機溶媒電池の提供を目的とする。An object of the present invention is to provide an organic solvent battery with a flat side lid that exhibits extremely small changes in the total height of the battery and has excellent discharge characteristics.
本発明の電池は、金属製の電池ケース8誼電亀ケースに
収納され、二硫化鉄を主成分とする正極合剤と有機電解
液を保持する−に/臂し一タと金属リチウムの負極とを
この順序で積層して成る発電要素;及び、鋏発電11!
票に冠着され、銀電池ケースと電気絶縁性のガスケット
を介して気密に一体化される金属製の負極封口板;とか
ら成る構造の扁平型有機溶媒電池において、該負極のl
llFr面積C8m)が鋏正極合剤の断面積(Sl)の
70%以下であフ、かつ、開時Km負極のv/lIWM
Rが骸負極封口板の内側断面積(8m)の40%以上7
0%以下でiることを特徴とする。The battery of the present invention is housed in a metal battery case, which holds a positive electrode mixture mainly composed of iron disulfide and an organic electrolyte, and a metal lithium negative electrode. A power generating element formed by laminating the above in this order; and the scissors power generating element 11!
In a flat organic solvent battery having a structure consisting of: a metal negative electrode sealing plate which is attached to a metal plate and is airtightly integrated with a silver battery case via an electrically insulating gasket;
llFr area C8m) is 70% or less of the cross-sectional area (Sl) of the scissors positive electrode mixture, and when opened Km negative electrode v/lIWM
R is 40% or more of the inner cross-sectional area (8 m) of the negative electrode sealing plate7
It is characterized by i at 0% or less.
本発明の11aにおいて、正極合剤はF@8s を主
成分とじ断衡積が81のベレットであシ、負4iFi断
aO7IIIがSt o金属リチウムlj(例えば円板
)である。In 11a of the present invention, the positive electrode mixture is a pellet containing F@8s as a main component and having an equilibrium product of 81, and the negative 4iFi fraction aO7III is Sto metal lithium lj (for example, a disk).
本発明電池の特徴の第1線、S、とSmの間にam/S
s≦70%の関係が成立する仁とである。 am/St
が70%を超え石と正極合剤の体積膨張に基づ〈厚みの
増大と負m(!7チクム)の厚み減少とのバランスがく
ずれて上配し九■の現象が進行して電池総高が増大する
。The first line of characteristics of the battery of the present invention is am/S between S and Sm.
This is the relationship between s≦70% and jin. am/St
exceeds 70%, the balance between the increase in the thickness and the decrease in the thickness of the negative m (!7 cm) is disrupted due to the volumetric expansion of the stone and the positive electrode mixture, and the phenomenon described in 9. height increases.
更に、本発明電池の特徴の第2は、負極の断面積と負極
封口板の開口部における内IIl断面積(Sl)との間
に、40%≦Ss/Sm≦70%の関係が成立すること
である* 8雪/8mが40%より小さい場合に扛、負
極(リチウム)の放電容量が小さすぎることと、爽には
放電進行による負極の厚み減少が正極合剤の体積膨張に
基づく厚み増大よりも太き〈な夛、その結果、負極と正
極合剤間の電気化学的接触不良が起生じて放電時間の長
期持続性が阻害される。逆に% Ss/3mが70%を
超えると正極合剤の体積膨張に基づく厚み増大を負fI
i(リチウム)の厚み減少によって緩和し得す、電池総
高の著しい増大を招く。Furthermore, the second characteristic of the battery of the present invention is that a relationship of 40%≦Ss/Sm≦70% is established between the cross-sectional area of the negative electrode and the inner cross-sectional area (Sl) at the opening of the negative electrode sealing plate. * If 8 snow/8 m is less than 40%, the discharge capacity of the negative electrode (lithium) is too small, and the thickness of the negative electrode due to the progress of discharge is due to volume expansion of the positive electrode mixture. If the thickness is thicker than the increase, as a result, poor electrochemical contact between the negative electrode and the positive electrode mixture occurs, and the long-term sustainability of the discharge time is inhibited. Conversely, when %Ss/3m exceeds 70%, the thickness increase due to volume expansion of the positive electrode mixture becomes negative fI.
This results in a significant increase in the total battery height, which can be alleviated by reducing the thickness of the lithium.
本発明電aは、王妃した2つの特徴を同時に満足しては
じめて効果を発揮するのであって、2つの特徴のうちい
ずれか一方のみを満足してもその目的は達成されない。The present invention (a) will only be effective if it satisfies the two characteristics at the same time, and its purpose will not be achieved if only one of the two characteristics is satisfied.
以上の説明で明らかなように、本発明の電池は従来構造
の5XF−型有櫨#縄!池において、正極合剤、負極、
負極封目板のそれぞれの断面積を所定の関係で相関せし
めることによって放電進行に伴う電池総高の増大を抑制
することができるのでその工業的価値は大である。As is clear from the above explanation, the battery of the present invention has a conventional structure of 5XF-type awning #rope! In the pond, the positive electrode mixture, negative electrode,
By correlating the cross-sectional areas of each of the negative electrode sealing plates in a predetermined relationship, it is possible to suppress an increase in the total height of the battery as discharge progresses, which has great industrial value.
以下に本発明電池を図に則した実施例に基づいて説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION The battery of the present invention will be described below based on examples shown in the drawings.
実施例1
市販のF@8m粉末95重量部及び黒鉛粉末3重量部に
*版のテト)フawxエチレン粉末2重量部を#l珈配
合し虎後、これらをV<キナ−で混合した。得られ九滉
会扮末を成形して直径8.7−厚み0.11簡の円板を
70&作顧し、これを正極合剤lとし友。このll1r
WJ積(S、)は59.4−1である。Example 1 95 parts by weight of commercially available F@8m powder and 3 parts by weight of graphite powder were mixed with 2 parts by weight of * version Tet) Fawx ethylene powder, and then mixed at V<Kina. The resulting material was molded into 70 disks with a diameter of 8.7 mm and a thickness of 0.11 mm, and this was used as a positive electrode mixture. This ll1r
The WJ product (S, ) is 59.4-1.
つ―で、これら正価合Mlと、厚みはいずれもIJi■
であって直径の異なる金属リチウム円板から成る負極と
を、1モル濃度の過#J[素すテクムー1’x溶解して
いる701Nビレシカ−&$−IAヒl、2−ゾメトキ
シェ!ン0混合電解液を含浸保持した竜ノダレーメ3(
4すlロビレン不織布〕を介シテ当接させ、゛負極断面
積(S、)の異なる721類の殆電要lA各種類lO備
針70個を作製し九。The net value of these Ml and the thickness are both IJi■
and a negative electrode consisting of metallic lithium disks with different diameters, a 1 molar concentration of 701N bile & $-IA Hill, 2-zometoxy! Ryunodareme 3 impregnated with 0 mixed electrolyte (
4 L Robyrene non-woven fabric] was brought into contact with the needles through the center, and 70 needles of 721 types with different negative electrode cross-sectional areas (S) were prepared.
ステンレススティール製で開口部の内径が7.0−の負
極封目板sを用意した。この負極封目板の内側断面積(
Sm)は38.5−である。A negative electrode sealing plate s made of stainless steel and having an opening with an inner diameter of 7.0 mm was prepared. The inner cross-sectional area of this negative electrode sealing plate (
Sm) is 38.5-.
次に尭電要素をステンレススティール製の電池ケース4
の中に収納し、この上がら負極封口板5會、端lls縁
に設は友ガスケット(例えばゴム)6を介して冠着し、
更に電池ケース4の開口部を内側KND−げて対口し気
密構造とした。かくして、直径9.4■、総高3.5観
の図に示しえよつな扁平履有機溶媒電池70個を作製し
た。なお、これらの電池組立ては、いずれの場合も、相
対5it2−以下の乾燥響囲気中て行なった。Next, place the electric element into the stainless steel battery case 4.
The negative electrode sealing plate 5 is placed on top of the negative electrode sealing plate 5, and the edge of the negative electrode sealing plate 5 is capped with a companion gasket (for example, rubber) 6 interposed therebetween.
Furthermore, the opening of the battery case 4 was opened to the inside to provide an airtight structure. In this way, 70 flat organic solvent batteries as shown in the figure, each having a diameter of 9.4 cm and a total height of 3.5 mm, were manufactured. In each case, these battery assemblies were carried out in a dry atmosphere with a relative humidity of 5 it2 or less.
以上70個の電池につき、常温で6.5KQO定負荷款
電を行なi、放電持続時間及び放電終了時における電池
総高を一1定した。The above 70 batteries were subjected to a constant load of 6.5 KQO at room temperature, and the discharge duration and total battery height at the end of discharge were kept constant.
結果t−6種類の電池につき平均値として一括して宍に
示した。Results t-6 types of batteries are collectively shown as an average value.
実施例2
市販のFoam粉末95重量部及び黒鉛粉末3重量部に
市販のテトラ7Rロ工チレン粉末2重量部を添加配合し
た後、これらをVtキサ−で混合した。得られた混合粉
末t−底成形て直径8.7謡厚み0.9−の円板を11
0枚作製し、これを正極合剤lとした。この断面積(S
l)は59.4−である。Example 2 2 parts by weight of commercially available Tetra 7R polyethylene powder were added to 95 parts by weight of commercially available Foam powder and 3 parts by weight of graphite powder, and then mixed using a Vt mixer. The obtained mixed powder was molded into 11 discs with a diameter of 8.7 mm and a thickness of 0.9 mm.
0 sheets were produced, and this was used as positive electrode mixture 1. This cross-sectional area (S
l) is 59.4-.
ついで、これら正極合剤lと、厚みはいずれ41.8■
であって直径の異なる金属リチウム円板から成る負極と
を、1モル1lIfO過塩素リチウムが溶解しているプ
ロピレンカーがネート及びl、 2−ジメトキシエタ
ンの拠金電解液を含浸保持したセパレータ3(−リデロ
ピレン不織布)を介して当接させ、負極断面積(& )
0異なゐ1111111の発電要票各種*10傭針1
10個を作側した。Next, the thickness of these positive electrode mixtures will be 41.8 cm.
A separator 3 impregnated with a propylene car in which 1 mol of 1 IfO lithium perchlorate is impregnated with a donor electrolyte of nate and l,2-dimethoxyethane ( −rideropyrene nonwoven fabric), and the negative electrode cross-sectional area (& )
0 different 1111111 various power generation forms *10 needle 1
I made 10 pieces.
次にこれら発電要嵩tl12図に示すがタン製電池形式
の特値測定用電池セルのステンレススティール調の電池
ケース4の中に収納し、この上をステンレススティール
製の集電体7を備えたテフロン1it)7タ8で押えた
。Next, as shown in Figure 12, these power generation requirements are stored in a stainless steel-like battery case 4 of a battery cell for special value measurement in the form of a tan battery, and a stainless steel current collector 7 is provided on top of the battery case 4. Pressed with Teflon 1it) 7ta 8.
以上110個の電−につき、常温で6.5 KB の定
負荷放電を行ない、放電持続時間、及び放電終了時にお
ける電電総高変化を測定した。それらの結果を各種類の
電池につき平均値として一括して表に示した。A constant load discharge of 6.5 KB was performed on the above 110 batteries at room temperature, and the discharge duration and the change in the total height of the batteries at the end of the discharge were measured. The results are collectively shown in the table as average values for each type of battery.
表から明らかなように、Ss/Stが70%を超えると
総高変化が急激に増加する仁とがわかる。As is clear from the table, when Ss/St exceeds 70%, the total height change rapidly increases.
第1図は、代表的な扁平型有機溶課電akO!IfFW
I図、第2図は特性測定用電池竜ルの断面図である。
l・・・正極合剤、2・・・負極、3・・・有機電解液
を保持する七ノ々レータ、4・・・電池ケース、5・・
・負極封目板、6・・・ガスケット、7・・・集電体、
8・・・チアミン製のフタ、Sl・・・正極合剤の断面
積、81・・負極の断面積、Ss・・・負極封目板の内
側断面積。Figure 1 shows a typical flat type organic electrolyte akO! IfFW
FIG. I and FIG. 2 are cross-sectional views of the battery tube for measuring characteristics. 1...Positive electrode mixture, 2...Negative electrode, 3...Nanonorator for holding organic electrolyte, 4...Battery case, 5...
・Negative electrode sealing plate, 6... gasket, 7... current collector,
8... Lid made of thiamine, Sl... Cross-sectional area of positive electrode mixture, 81... Cross-sectional area of negative electrode, Ss... Inner cross-sectional area of negative electrode sealing plate.
Claims (1)
合剤と有機電解液を保持するセ・奢し−メと金属リチウ
ムの負極とをこの順序で積層して成る発電!!嵩;及び
、 腋尭電要素Kj!i!着され、腋電池ケースと電気絶縁
性のガスケットを介して気11に一体化される金属性の
負極封目板、点から成る構造oiaXPrtit有機l
lI謀電−において、 鋏負極の断面積が鋏正極金剤の断面積07011以下で
あ)、 かつ、同時に 鋏負極の断面積が鋏負極封口板の内側II?面積040
−以よ70−以下である ことを特徴とする扁平瀝有4#&溶媒電池。[Scope of Claims] Metallic/AO battery case: A battery case that was used in the war and that holds a positive electrode mixture mainly composed of iron disulfide and an organic electrolyte, and a battery case made of metallic lithium. Power generation is achieved by stacking the negative electrode and the negative electrode in this order! ! Bulk; and armpit electric element Kj! i! OIA
In the case of lI electrical conduction, the cross-sectional area of the scissors negative electrode is less than or equal to the cross-sectional area of the scissors positive electrode gold material (07011), and at the same time, the cross-sectional area of the scissors negative electrode is inside the scissors negative electrode sealing plate II? Area 040
A flat 4# & solvent battery characterized in that: -70- or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15567381A JPS5857271A (en) | 1981-09-30 | 1981-09-30 | Flat type organic solvent battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15567381A JPS5857271A (en) | 1981-09-30 | 1981-09-30 | Flat type organic solvent battery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5857271A true JPS5857271A (en) | 1983-04-05 |
Family
ID=15611075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15567381A Pending JPS5857271A (en) | 1981-09-30 | 1981-09-30 | Flat type organic solvent battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5857271A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253170A (en) * | 1985-05-02 | 1986-11-11 | Canon Inc | Laser soldering device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51115626A (en) * | 1975-02-25 | 1976-10-12 | Union Carbide Corp | Nonnaqueous battery using electrolytic solution based on 33methyll22oxasolidone |
-
1981
- 1981-09-30 JP JP15567381A patent/JPS5857271A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51115626A (en) * | 1975-02-25 | 1976-10-12 | Union Carbide Corp | Nonnaqueous battery using electrolytic solution based on 33methyll22oxasolidone |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61253170A (en) * | 1985-05-02 | 1986-11-11 | Canon Inc | Laser soldering device |
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