JPH03134949A - Thin type lithium battery - Google Patents
Thin type lithium batteryInfo
- Publication number
- JPH03134949A JPH03134949A JP1272830A JP27283089A JPH03134949A JP H03134949 A JPH03134949 A JP H03134949A JP 1272830 A JP1272830 A JP 1272830A JP 27283089 A JP27283089 A JP 27283089A JP H03134949 A JPH03134949 A JP H03134949A
- Authority
- JP
- Japan
- Prior art keywords
- case
- aluminum
- gasket
- stainless steel
- 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
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 24
- 229910052744 lithium Inorganic materials 0.000 title claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 14
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 27
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 238000010248 power generation Methods 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 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
- 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、細形リチウム電池の改良に関するものである
。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in slim lithium batteries.
従来の技術
細形リチウム電池の代表的な断面を第１図に示した。１
は負極端子を兼ねる集電棒で、ブチルゴムから成るガス
ケット２の底部と接する部分に円板状のつばが張り出て
いる。集電棒１のつば部より下はまずリチウム３が巻き
付けられている。さらにその上からリチウム３を覆うよ
うにセパレータ４が巻き付けられている。集電棒１の先
端部は、セパレータ４を溶着して集電棒１が正極合剤５
に直接接触しないようにしである。正極合剤５は、芯材
に正極活物質やカーボンのような導電剤を充填したもの
で、一定寸法に打ち抜いたものがアルミニウムからなる
正極端子を兼ねたケース６の中に挿入しである。封口部
は、集電棒１に挿入した円筒状のガスケット２を正極ケ
ース６の上端で内側にカシメる一方、正極ケース側面か
ら内側に向かって環状の溝部を形成し、ガスケット２の
圧縮を行なっている。A typical cross section of a conventional thin lithium battery is shown in FIG. 1
is a current collector rod that also serves as a negative electrode terminal, and has a disk-shaped collar protruding from the portion that contacts the bottom of the gasket 2 made of butyl rubber. Below the collar of the current collector rod 1, lithium 3 is first wound. Further, a separator 4 is wrapped around the lithium 3 so as to cover the lithium 3 from above. A separator 4 is welded to the tip of the current collector rod 1, and the current collector rod 1 is coated with a positive electrode mixture 5.
Avoid direct contact with. The positive electrode mixture 5 has a core material filled with a positive electrode active material and a conductive agent such as carbon, and is punched out to a certain size and inserted into a case 6 made of aluminum that also serves as a positive electrode terminal. The sealing part is formed by caulking the cylindrical gasket 2 inserted into the current collector rod 1 inward at the upper end of the positive electrode case 6, while forming an annular groove inward from the side surface of the positive electrode case to compress the gasket 2. There is.
発明が解決しようとする課題
従来の電池の欠点は、封口部の機密性が悪いため耐漏液
性及び保存性が悪い点にある。封口部の液密性が悪い原
因は主としてケース材質とガスケット材質によるところ
が大きい。細形リチウム電池に使用するケースは、径が
小さく、はぞ長い形状をしているため加工が難しく、材
料の点で制約がある。一般に、リチウム電池やアルカリ
電池のケース材として使われているステンレスや鉄のよ
うに固くて伸びの小さい金属では深絞シ加工ができない
ため軟らかく伸びのある金属が必要となっている。又リ
チウム電池の正極ケース材としては化学的、電気化学的
に腐食をしないことが重要な条件になっている。そのた
めに、コイン形リチウム電池ではステンレスが使われて
いる。特に正極活物質にフッ化黒鉛（ＯＦ）ｎ を用い
たフッ化黒鉛リチウム電池の場合は、クロム含有量の多
い高耐食性ステンレスを用いている。Problems to be Solved by the Invention The disadvantages of conventional batteries are that the leakage resistance and storage stability are poor due to the poor airtightness of the sealing portion. The reason for the poor liquid tightness of the sealing part is mainly due to the case material and gasket material. The cases used for slim lithium batteries are small in diameter and elongated, making them difficult to process and subject to limitations in terms of materials. Generally, metals that are hard and have low elongation, such as stainless steel and iron, which are used as case materials for lithium and alkaline batteries, cannot be deep drawn, so a soft and elongated metal is required. Furthermore, it is an important condition for the positive electrode case material of lithium batteries to be free from chemical and electrochemical corrosion. For this reason, stainless steel is used in coin-type lithium batteries. In particular, in the case of a fluorinated graphite lithium battery using fluorinated graphite (OF) n as the positive electrode active material, highly corrosion-resistant stainless steel with a high chromium content is used.
以上のように加工性と耐食性の両方の特性を満足させる
ために細形リチウム電池のケース材としテアルミニウム
が使われてきた。アルミニウムケースは加工性が良いと
いう反面、強度が弱い欠点を持っている。特に封目時、
ガスケットをカシメたり、環状溝部を形成してガスケッ
トを圧縮する際に少しでも無理をするとアルミニウムケ
ースの破断が生じてしまう。又、アルミニウムケースを
用いた場合のガスケット材質はゴムのようにアルミニウ
ムの強度より弱いものを用いる必要がある。As described above, aluminum has been used as a case material for small lithium batteries in order to satisfy the characteristics of both workability and corrosion resistance. Although aluminum cases have good workability, they have the disadvantage of low strength. Especially when sealed,
If even the slightest force is applied when caulking the gasket or compressing the gasket by forming an annular groove, the aluminum case will break. Furthermore, when an aluminum case is used, the gasket material needs to be made of a material weaker than aluminum, such as rubber.
例えば、コイン形リチウム電池で使われているポリプロ
ピレン製のガスケノ）・を用いて封口した場合、ポリプ
ロピレン製ガスケットに対するアルミニウムケースのカ
シメの力が弱めため、カシメる以前にアルミニウムのケ
ースが異常に伸びたり変形したシして封口ができない現
象が生じる。このように、細形リチウム電池においては
、ケース材としてアルミニウム、ガスケット材としてゴ
ムを用いることが避けられないこととなっていた。For example, when sealing is done using a polypropylene gasket used in coin-shaped lithium batteries, the force of caulking the aluminum case against the polypropylene gasket is weakened, so the aluminum case may stretch abnormally before caulking. A phenomenon occurs in which the seal becomes deformed and cannot be sealed. Thus, in small lithium batteries, it has become inevitable to use aluminum as the case material and rubber as the gasket material.
従って、封口してもカシメの力や、ガスケットの反発力
が弱いため漏液しやすくなっている。電池の保存性につ
いても同様で、高温保存では電池内の電解液の蒸発によ
る劣化が、多湿中における保存では水分の侵入による特
性の劣化が生じやすくなっている。コイン形リチウム電
池に比べ、耐漏液性や保存性の点で劣るのは以上述べて
きたことによる理由が大きい。又、同じ細形であっても
電池外径が小さくなるほどこれらの欠点が顕著に現われ
てくる。Therefore, even if the seal is sealed, the force of caulking and the repulsive force of the gasket are weak, making it easy for liquid to leak. The same goes for the storage stability of batteries; storage at high temperatures tends to cause deterioration due to evaporation of the electrolyte within the battery, while storage in high humidity tends to cause deterioration of characteristics due to moisture intrusion. The reason why they are inferior to coin-shaped lithium batteries in terms of leakage resistance and storage stability is largely due to the reasons mentioned above. Moreover, even if the battery has the same thin shape, these drawbacks become more noticeable as the outer diameter of the battery becomes smaller.
本発明は、このような問題点を解決することを目的とし
ている。The present invention aims to solve these problems.
課題を解決するための手段
本発明は、前記の目的を達成するために、正極ケースの
材質、！：してステンレスとアルミニウム、又はニッケ
ルとアルミニウムの２層からなる材質を用い、電池内部
にアルミニウム層がくるように成型した正極ケースを用
いたことを特徴とするものである。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a material for the positive electrode case! :The battery is characterized by using a material made of two layers of stainless steel and aluminum, or nickel and aluminum, and using a positive electrode case molded so that the aluminum layer is placed inside the battery.
作用
このようにケース材として、アルミニウムの長所を活か
しつつステンレスやニッケルで強度を補なうと、封目時
のカシメの力が大きくなり機密性が向上する。これによ
り電池の耐漏液性及び保存性が向上する。さらにケース
材質の強化によりガスケット材質としてゴム以外のポリ
プロピレンやポリエチレンのようなプラスチックの使用
が可能となるため、それらと組み合わせて使用すると耐
漏液性や保存性の大幅な向上がはかれる。Function: By utilizing the advantages of aluminum as a case material and supplementing its strength with stainless steel or nickel, the crimp force at the time of sealing increases and airtightness improves. This improves the leakage resistance and storage stability of the battery. Furthermore, by strengthening the case material, it becomes possible to use plastics other than rubber, such as polypropylene and polyethylene, as gasket materials, so when used in combination with these materials, leakage resistance and storage stability can be greatly improved.
実施例 以下、本発明の詳細な説明する。Example The present invention will be explained in detail below.
電池のサイズは、外径２閣、高さ１１酎の細形リチウム
電池であり、その構成は第１図と同じとした。図中１は
負極端子を兼ねる集電棒で、外径が０．６＃のステンレ
スからできている。２はポリプロピレン製のガスケット
で、集電棒１のつば部の上に載っている。３は負極リチ
ウムで、シート状のリチウム箔を一定寸法に切断したも
のを集電棒１に巻きつけである。４はポリプロピレン製
の不織布からなるセパレータで、集電棒１に巻きつけた
リチウム３を覆うように巻きつけである。５は正極合剤
で、チタン製の芯材にフッ化炭素とカーボンの合剤を充
填したシートを、一定寸法に打ち抜いた後正極ケース６
の内壁に密着するように挿入されている。正極ケース６
は厚さ０．１ ｒｔａｎのアルミニウム層厚す０．１朋
のステンレス（ＳＵＳ３０４）をはり合わせたクラッド
村からなり、ケース内面にアルミニウム面がくるように
成型されている。封口部は、集電棒１に挿入した円筒状
のガスケット２を正極ケース６の上端で内側にカシメる
一方、正極ケース側面から内側に向かって環状の溝部を
形成し、ガスケット２の圧縮を行なっている。電解液は
γ−ブチロラクトン、１．２−ジメトキシエタン、ホウ
フッ化リチウムから成り、セパレータ４や正極合剤５に
含浸されている。The size of the battery was a slim lithium battery with an outer diameter of 2 mm and a height of 11 mm, and its configuration was the same as that shown in Figure 1. In the figure, numeral 1 is a current collector rod that also serves as a negative electrode terminal, and is made of stainless steel with an outer diameter of 0.6#. 2 is a gasket made of polypropylene, and is placed on the collar of the current collector rod 1. 3 is a negative electrode lithium, which is a sheet-like lithium foil cut into a certain size and wound around the current collector rod 1. Reference numeral 4 denotes a separator made of a nonwoven fabric made of polypropylene, which is wound so as to cover the lithium 3 wound around the current collector rod 1. 5 is a positive electrode mixture, and a sheet made of a titanium core material filled with a mixture of fluorocarbon and carbon is punched out to a certain size, and then a positive electrode case 6
It is inserted so that it fits tightly against the inner wall of the Positive electrode case 6
The case is made of a cladding made of a 0.1 rtan aluminum layer laminated with a 0.1 m thick stainless steel (SUS304), and is molded so that the aluminum surface is on the inside of the case. The sealing part is formed by caulking the cylindrical gasket 2 inserted into the current collector rod 1 inward at the upper end of the positive electrode case 6, while forming an annular groove inward from the side surface of the positive electrode case to compress the gasket 2. There is. The electrolytic solution consists of γ-butyrolactone, 1,2-dimethoxyethane, and lithium borofluoride, and is impregnated into the separator 4 and the positive electrode mixture 5.
次に本発明品と従来品の漏液試験の比較を表１に、高温
保存試験の比較を表２に示した。漏液試愉は一り０℃〜
６０’（、のヒートショック（２ｈ／サイクル）中で行
ない１週毎に顕微鏡で漏液のチエツクを行なった。高温
保存試験は、電池を８０℃で保存し、２０日毎に取り出
した後２２にΩで放電し１，８ｖになるまでの放電持続
時間を測定した。Next, Table 1 shows a comparison of the liquid leakage test between the product of the present invention and the conventional product, and Table 2 shows a comparison of the high temperature storage test. Leakage test is at 0℃~
The test was carried out under heat shock (2 h/cycle) of 60' (2 h/cycle), and leakage was checked with a microscope every week. In the high temperature storage test, the battery was stored at 80 °C and removed every 20 days. The discharge duration until the voltage reached 1.8V after discharging at Ω was measured.
〈表 １〉
く 表
２ 〉
表１の漏液試験の結果、本発明品の電池はヒートショッ
ク６週経過後も漏液の発生はなかったが、従来電池は２
週目ですでに漏液の発生があり、３週目以後は急激に増
加している。又表２の高温保存試験の結果では、本発明
品の放電持続時間の劣化に対し、従来品の劣化が非常に
大きいことがわかる。<Table 1> Table 2> As a result of the leakage test shown in Table 1, the battery of the present invention did not leak even after 6 weeks of heat shock, but the conventional battery did not
Leakage has already occurred in the first week, and increases rapidly after the third week. Furthermore, the results of the high temperature storage test shown in Table 2 show that the deterioration of the discharge duration of the product of the present invention is much greater than that of the conventional product.
本発明品のねらいは、ケース材質として耐腐食性のアル
ミニウムをケース内面に、強度の強いステンレスやニッ
ケルを外面にすることによりそれぞれの長所を活かした
ととるにある。実施例ではステンレスとアルミニウムを
はり合わせたクラツド材について説明したが、ニッケル
とアルミニウムのクラツド材でも同様の結果が得られて
いる。The aim of the product of the present invention is to take advantage of the advantages of both materials by using corrosion-resistant aluminum for the inner surface of the case and strong stainless steel or nickel for the outer surface. In the example, a clad material made of stainless steel and aluminum was explained, but similar results were obtained with a clad material of nickel and aluminum.
又、アルミニウムと他の金属との厚みの割合はケース厚
みによって種々のケースが考えられるが、アルミニウム
層の厚みは少なくとも０．１ｗ以上あることが望ましい
。これは、アルミニウムの厚みが薄くなると封口時に環
状溝部を設けた際にアルミニウム層にひび割れが生じ腐
食が生じるからである。Furthermore, various cases can be considered for the ratio of the thickness of aluminum to other metals depending on the thickness of the case, but it is desirable that the thickness of the aluminum layer is at least 0.1w or more. This is because when the thickness of aluminum becomes thinner, the aluminum layer cracks and corrosion occurs when an annular groove is provided during sealing.
発明の効果
以上の実施例からも明らかなように、正極ケースの材質
としてステンレスとアルミニウム、又はニッケルとアル
ミニウムの２層から成る材質を用いた本発明の電池は、
耐漏液性及び保存性が大幅に向上した。Effects of the Invention As is clear from the above examples, the battery of the present invention using a material consisting of two layers of stainless steel and aluminum or nickel and aluminum as the material of the positive electrode case has the following effects:
Leak resistance and storage stability have been significantly improved.
第１図は代表的な細形リチウム電池を示す半断面図であ
る。
１・・・・・・集電棒、２・・・・・・ガスケット、３
・・・・・・リチウム、４・・・・・・セパレータ、６
・・・・・・正りｂ合剤、６・・・正極ケース。
１−菓（棒FIG. 1 is a half-sectional view of a typical thin lithium battery. 1... Current collector rod, 2... Gasket, 3
...Lithium, 4...Separator, 6
...Correct b mixture, 6...Positive electrode case. 1- Confectionery (stick)
Claims (1)
ス６と、ガスケット２を介してその中心部に位置し、負
極リチウム３を巻き付けた負極集電棒１からなる電池で
あって、前記ケース６はその材質がステンレスとアルミ
ニウム、又はニッケルとアルミニウムの２層から成り、
電池内部にアルミニウム層がくるように成型したことを
特徴とする細形リチウム電池。The battery consists of a bottomed cylindrical case 6 that contains a power generation element and also serves as a positive terminal, and a negative electrode current collector rod 1 that is located at the center of the case with a gasket 2 interposed therebetween and around which a negative electrode lithium 3 is wound. The material is made of two layers of stainless steel and aluminum, or nickel and aluminum.
A slim lithium battery characterized by being molded with an aluminum layer inside the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1272830A JPH03134949A (en) | 1989-10-19 | 1989-10-19 | Thin type lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1272830A JPH03134949A (en) | 1989-10-19 | 1989-10-19 | Thin type lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03134949A true JPH03134949A (en) | 1991-06-07 |
Family
ID=17519364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1272830A Pending JPH03134949A (en) | 1989-10-19 | 1989-10-19 | Thin type lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03134949A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0899799A2 (en) * | 1997-08-29 | 1999-03-03 | Sumitomo Electric Industries, Ltd. | Jar can for secondary battery |
| JP2005203169A (en) * | 2004-01-14 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Oblong nonaqueous electrolyte battery |
| CN112736333A (en) * | 2019-10-10 | 2021-04-30 | 瓦尔达微电池有限责任公司 | Secondary lithium battery and method of manufacturing the same |
-
1989
- 1989-10-19 JP JP1272830A patent/JPH03134949A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0899799A2 (en) * | 1997-08-29 | 1999-03-03 | Sumitomo Electric Industries, Ltd. | Jar can for secondary battery |
| JPH11135079A (en) * | 1997-08-29 | 1999-05-21 | Sumitomo Electric Ind Ltd | Battery jar for secondary battery |
| EP0899799A3 (en) * | 1997-08-29 | 2000-04-26 | Sumitomo Electric Industries, Ltd. | Jar can for secondary battery |
| US6127064A (en) * | 1997-08-29 | 2000-10-03 | Sumitomo Electric Industries, Ltd. | Jar can for secondary battery |
| JP2005203169A (en) * | 2004-01-14 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Oblong nonaqueous electrolyte battery |
| CN112736333A (en) * | 2019-10-10 | 2021-04-30 | 瓦尔达微电池有限责任公司 | Secondary lithium battery and method of manufacturing the same |
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