JPS63146348A - Separator for enclosed lead storage battery - Google Patents
Separator for enclosed lead storage batteryInfo
- Publication number
- JPS63146348A JPS63146348A JP61291838A JP29183886A JPS63146348A JP S63146348 A JPS63146348 A JP S63146348A JP 61291838 A JP61291838 A JP 61291838A JP 29183886 A JP29183886 A JP 29183886A JP S63146348 A JPS63146348 A JP S63146348A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- separator
- gas
- glass thin
- hollow
- 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
- 239000003365 glass fiber Substances 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 abstract description 10
- 239000011521 glass Substances 0.000 abstract description 9
- 239000008151 electrolyte solution Substances 0.000 abstract description 8
- 230000000717 retained effect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 1
- 230000036647 reaction Effects 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 11
- 229910001868 water Inorganic materials 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 229920005822 acrylic binder Polymers 0.000 description 2
- 239000011149 active material Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 2
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910052924 anglesite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- YADSGOSSYOOKMP-UHFFFAOYSA-N lead dioxide Inorganic materials O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
- H01M50/434—Ceramics
- H01M50/437—Glass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0002—Aqueous electrolytes
- H01M2300/0005—Acid electrolytes
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Cell Separators (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、負極で０２ガスを吸収する負極吸収式の密閉
形鉛蓄電池用セパレータの改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a separator for a sealed lead-acid battery of a negative electrode absorption type, in which the negative electrode absorbs 02 gas.
従来の技術
近年、電子機器の急速な小形化とポータプル化の動向と
ともに経済性、省資源という観点から小形鉛蓄電池が脚
光を浴びてきている。機器に内蔵される小形鉛蓄電池は
、どのような方向、位置で使用されても液漏れしない密
閉形構造が好ましく、ゲル化剤を入れて電解液をゲル化
し固定する方式と、セパレータに電解液を吸収、保持さ
せるリテーナ式があるが、最近はリテーナ式に移行して
きている。BACKGROUND OF THE INVENTION In recent years, along with the trend of rapid downsizing and portability of electronic devices, small lead-acid batteries have been attracting attention from the viewpoint of economy and resource conservation. Small lead-acid batteries built into equipment preferably have a sealed structure that does not leak no matter where they are used in any direction or position. There is a retainer type that absorbs and retains the water, but recently there has been a shift to the retainer type.
電池の密閉化の方式としては、いくつかの方法がある。There are several methods for sealing a battery.
すなわち、正極の容量を負極より太きくし、過充電時に
、まず負極よりＨ２ガスが発生するようにし、正極に接
続し之補助電極で水に還元する第３電極方式、また、正
衡から発生する０２ガスと負極から発生するＨ２ガスと
を気相触媒により水にもど丁触媒栓方式、さらにまた、
負極の容量を正極より太きくし、正極より０２．ガスだ
けが発生するようにし、これを負極で吸収し水にもどす
負極吸収方式などがあるが、最近では負極吸収方式が主
になってきている。In other words, the capacity of the positive electrode is made larger than that of the negative electrode, so that during overcharging, H2 gas is first generated from the negative electrode, and H2 gas is connected to the positive electrode and reduced to water by the auxiliary electrode. 02 gas and H2 gas generated from the negative electrode are added to water using a gas phase catalyst using a catalyst plug method.
The capacity of the negative electrode is made larger than that of the positive electrode, and the capacity of the negative electrode is made larger than that of the positive electrode. There are negative electrode absorption methods in which only gas is generated, which is absorbed by the negative electrode and returned to water, but recently the negative electrode absorption method has become mainstream.
従来、負極吸収式の密閉形鉛蓄電池は、ＰｂＯ２よりな
る正極板、ｐｂよシなる負極板およびガラス細繊維など
の不織布よりなるセパレータから構成されている。セパ
レータは１〜１０ミクロンのガラス細繊維がアクリル系
のバインダーによりからまった構造の不織布であり、こ
のセパレータおよび正、負極極板に、Ｈ２ＳＯ４よりな
る電解液が吸液２保持されている。ただし、電池をどの
ような方向で使用しても液漏れしないように電解液量は
制限されている。しかしながら電解液も電池活物、−ｊ
ゝ
質であり、ある一定量を必要とする。よって、セパレー
タは必要量の電解液を吸液、保持する几めに正、負極極
板と同じ位の厚みを必要とする。従来の一実施例の電池
断面図を第３図に示す。正極板７はセパレータ８．８′
を介して２枚の負極板９．９′に挾まれてポリプロピレ
ン樹脂からなる電槽１ｏに挿入さｎている。正極板７の
厚みは２ｎ、負極板９．９′の厚みは１闘であり、活物
質の容量比率は１．２ ： １で負極の方が多くなって
いる。セパレータ８．８′は５ミクロンのガラス細繊維
をアクリルバインダーでからませて不織布にし之もので
あり厚みは２０ ｋｇ ／ ｄｍ荷重時で１．２謂であ
る。そして電解液として、比重１．３０の硫酸が正、負
極極板およびセパレータに含浸、保持されている。Conventionally, a sealed lead-acid battery of the negative electrode absorption type is composed of a positive electrode plate made of PbO2, a negative electrode plate made of PB, and a separator made of a nonwoven fabric such as glass fine fiber. The separator is a nonwoven fabric having a structure in which fine glass fibers of 1 to 10 microns are entangled with an acrylic binder, and an electrolytic solution made of H2SO4 is absorbed and held in the separator and the positive and negative electrode plates. However, the amount of electrolyte is limited to prevent leakage no matter what direction the battery is used. However, the electrolyte is also a battery active material, −j
It is a quality and requires a certain amount. Therefore, the separator needs to have the same thickness as the positive and negative electrode plates in order to absorb and retain the required amount of electrolyte. FIG. 3 shows a cross-sectional view of a battery according to a conventional embodiment. The positive electrode plate 7 is a separator 8.8'
It is inserted into a battery case 1o made of polypropylene resin and sandwiched between two negative electrode plates 9 and 9'. The thickness of the positive electrode plate 7 is 2n, the thickness of the negative electrode plate 9.9' is 1mm, and the capacity ratio of the active materials is 1.2:1, with the negative electrode being larger. The separator 8.8' is made of a non-woven fabric made by entwining 5 micron glass fine fibers with an acrylic binder and has a thickness of 1.2 mm at a load of 20 kg/dm. As an electrolytic solution, sulfuric acid having a specific gravity of 1.30 is impregnated and held in the positive and negative electrode plates and the separator.
過充電時には、まず正極が完全充電され０２ガスの発生
が起こる。そして、この０２ガスはセパレータ中を拡散
し負極に到達し、そこで負極と反応し、下記のように負
極は酸化鉛を経て硫酸鉛になる。During overcharging, the positive electrode is first fully charged and 02 gas is generated. Then, this 02 gas diffuses through the separator and reaches the negative electrode, where it reacts with the negative electrode, and the negative electrode becomes lead sulfate through lead oxide as described below.
正極 Ｈ２０→１７ ｏ２＋ ２Ｈ＋ ２６負極
ｐｂ ＋ ４０２→ｐｂ。Positive electrode H20→17 o2+ 2H+ 26 negative electrode
pb + 402 → pb.
ＰｂＯ＋ Ｈ２Ｓｏ４→ＰｂＳＯ４＋ Ｈ２Ｏすなわち
７ｉ［鉛は負極の放電生成物であり、この反応が続くか
ぎり負極は完全充電状態にならず、Ｈ２ガスの発生は起
こらない。よって密閉化が可能となる。PbO+ H2So4→PbSO4+ H2O, or 7i [Lead is a discharge product of the negative electrode, and as long as this reaction continues, the negative electrode will not be fully charged and no H2 gas will be generated. Therefore, sealing becomes possible.
置部は安全弁であり、なんらかの原因で電池内圧が上昇
し次場合には、ゴム弁１１を押し上げて通気孔１３．排
気孔１２を通ってガスが抜けるようにして電池内圧が異
常に上昇しないようにしである。The mounting part is a safety valve, and if the internal pressure of the battery rises for some reason, the rubber valve 11 is pushed up and the ventilation hole 13. Gas is allowed to escape through the exhaust hole 12 to prevent the internal pressure of the battery from rising abnormally.
発明が解決しようとする問題点
このような従来の構成では、大電流で過充電した場合、
セパレータ中には電解液が存在するので０２ガスの負極
への拡散はゆるやかにしか行なわれず負極での吸収反応
は遅いので、ガス吸収による硫酸鉛の生成量よりも、充
電により還元さｎる硫酸鉛量の方が多くなる。よって、
あらかじめ正極よりも多く入れておいた硫酸鉛はなくな
ってしマイ、負極は完全充電状態になり、Ｈ２ガスの発
生が起とり、電池内圧の上昇をきたし０２ガスおよびＨ
２ガスが安全弁より抜は出す。すなわち水が電気分解さ
れて減液する。水が減少すると電解液の濃度が上昇する
ことになり、そうすると電解液の粘度が高くなり液の移
動がしにくくなるので放電特性が悪くなっ之り、また濃
度が高くなると格子が腐食されやすくなるなどの問題が
あった。Problems to be Solved by the Invention In such a conventional configuration, when overcharged with a large current,
Since there is an electrolyte in the separator, the diffusion of 02 gas to the negative electrode occurs only slowly, and the absorption reaction at the negative electrode is slow. The amount of lead will be higher. Therefore,
The lead sulfate, which was added in a larger amount than the positive electrode, is now gone, and the negative electrode is now fully charged, generating H2 gas and increasing the internal pressure of the battery.
2 Gas is removed from the safety valve. In other words, water is electrolyzed and the liquid is reduced. When water decreases, the concentration of the electrolyte increases, which increases the viscosity of the electrolyte and makes it difficult for the liquid to move, resulting in poor discharge characteristics.Also, as the concentration increases, the grid becomes more susceptible to corrosion. There were other problems.
本発明はこのような問題を解決するもので、過充電時に
まず正極より発生する０２ガスの負極への拡散、吸収を
良好にせしめて、大・電流での過充電特性、すなわち負
極のガス吸収能を改善することを目的とするものである
。The present invention solves this problem by improving the diffusion and absorption of 02 gas generated from the positive electrode into the negative electrode during overcharging, thereby improving the overcharging characteristics at large currents, that is, the gas absorption of the negative electrode. The purpose is to improve performance.
問題点を解決するための手段
この問題点を解決するために本発明は、セパレータの中
空繊維状のガラス細繊維を含む構成にし次ものである。Means for Solving the Problems In order to solve this problem, the present invention employs a structure in which the separator includes hollow glass fibers.
作用
この構成により、電解液はまず最初に、毛管現象により
セパレータのガラス細繊維の中空部に吸液、保持される
。よって電池反応に必要な電解液量はガラス細繊維の中
空部に保持されるので、ガラス細繊維間の空隙部にはほ
とんど電解液が存在しない。すなわち、ガス層ができる
のでセパレータを通ってガスの拡散がしやすくなる。Operation With this configuration, the electrolytic solution is first absorbed and retained in the hollow part of the glass fibers of the separator by capillary action. Therefore, the amount of electrolyte required for the battery reaction is retained in the hollow portions of the glass fine fibers, so that almost no electrolyte exists in the voids between the glass fine fibers. That is, since a gas layer is formed, gas can easily diffuse through the separator.
実施例
第１図は本発明の一実施例による七）（レータの拡大断
面図である。第１図において、ガラス細繊維１は約１０
ミクロン径の大きさであり、その中心部には２〜６ミク
ロン径の中空部２が貫通している。そして、中空部２に
は電解液３が吸液、保持されている。またガラス細繊維
１がからまシあった位置にも電解液３′が存在するが、
空隙部４のほとんどは電解液の存在しないガス層になっ
ている。Embodiment FIG. 1 is an enlarged cross-sectional view of a plater according to an embodiment of the present invention. In FIG.
It has a diameter of microns, and a hollow part 2 with a diameter of 2 to 6 microns penetrates through its center. An electrolytic solution 3 is absorbed and held in the hollow portion 2 . Electrolyte solution 3' also exists in the position where the glass fibers 1 were entangled.
Most of the void 4 is a gas layer in which no electrolyte exists.
第２図に、本発明のセパレータ６および従来のセパレー
タ６を用い７’（２ムｈ容量の密閉形鉛蓄電池を各種充
電電流で１週間過充電し次ときの重量減少を示しである
。重量減少は、既に述べたように負極による０２ガス吸
収能を評価する手段となりつる。第２図から明らかなよ
うに、本発明のセパレータは良好なガス吸収能を有して
おり、０．１５ＯＡ充電では従来品に比べて１０倍のガ
ス吸収能があることがわかる。FIG. 2 shows the weight loss after overcharging sealed lead-acid batteries with a capacity of 7' (2 μh) using the separator 6 of the present invention and the conventional separator 6 at various charging currents for one week. As mentioned above, the decrease can be used as a means to evaluate the 02 gas absorption ability of the negative electrode.As is clear from FIG. 2, the separator of the present invention has a good gas absorption ability, and the It can be seen that the gas absorption capacity is 10 times that of conventional products.
発明の効果
以上のように本発明によれば、電解液はセパレータのガ
ラス細繊維の中空部に大部分が吸液、保持さｎるので、
セパレータ中に空隙部が存在するようになりガスが通過
しやすい。すなわち過充電時にまず、正極で発生する０
２ガスはすみやかに負極板上に拡散することができるの
で、大電流で過充電しても負極は０２ガス吸収反応をよ
り早く行なうことができるので常に未充電状態にあり、
ゆえにＨ２ガスの発生は起こらず、水分解による減液は
起こらない。よって減液による電池性能劣化を防ぎ、１
次格子の腐食を防ぐという効果が得られる。Effects of the Invention As described above, according to the present invention, most of the electrolyte is absorbed and retained in the hollow part of the glass fibers of the separator.
There are voids in the separator, allowing gas to easily pass through. In other words, during overcharging, the 0 generated at the positive electrode first
2 gas can quickly diffuse onto the negative electrode plate, so even if it is overcharged with a large current, the negative electrode can carry out the 02 gas absorption reaction more quickly, so it is always in an uncharged state.
Therefore, generation of H2 gas does not occur, and liquid reduction due to water decomposition does not occur. Therefore, battery performance deterioration due to liquid reduction is prevented, and 1
This has the effect of preventing corrosion of the secondary grid.
第１図は本発明の一実施例によるセパレータの拡大断面
図、第２図は本発明および従来のセパレータを用いた場
合の各充電電流による過充電時の重量変化を示す図、第
３′図は従来の密閉形鉛蓄電池の断面図である。
１・・・・・・ガラス細繊維、２・・・・・・中空部、
３・ ３′・・・・・・電解液、４・・・・・・空隙部
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名３−
電解源
了−電＠Ｊ
４− 望陳鄭
第１図
θ、０５ σｌ θ、１５
充電覧流（Ｃ旬Figure 1 is an enlarged sectional view of a separator according to an embodiment of the present invention, Figure 2 is a diagram showing weight changes during overcharging due to various charging currents when using the present invention and a conventional separator, and Figure 3'. is a cross-sectional view of a conventional sealed lead acid battery. 1...Glass fine fiber, 2...Hollow part,
3. 3'... Electrolyte, 4... Vacancy. Name of agent: Patent attorney Toshio Nakao and 1 other person3-
Electrolytic source Li-Electric @J 4- Wangchen Zheng Fig. 1 θ, 05 σl θ, 15 Charging flow (C
Claims (1)
蓄電池用セパレータ。A separator for sealed lead-acid batteries characterized by containing hollow glass fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61291838A JPS63146348A (en) | 1986-12-08 | 1986-12-08 | Separator for enclosed lead storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61291838A JPS63146348A (en) | 1986-12-08 | 1986-12-08 | Separator for enclosed lead storage battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63146348A true JPS63146348A (en) | 1988-06-18 |
Family
ID=17774071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61291838A Pending JPS63146348A (en) | 1986-12-08 | 1986-12-08 | Separator for enclosed lead storage battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63146348A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225298A (en) * | 1989-02-27 | 1993-07-06 | Yuasa Battery Co., Ltd. | Sealed lead acid battery and separator for use in sealed lead acid battery |
| US5281498A (en) * | 1991-05-23 | 1994-01-25 | Nippon Sheet Glass Co., Ltd. | Sheet-like separator and valve regulated lead acid battery |
| US9293748B1 (en) | 2014-09-15 | 2016-03-22 | Hollingsworth & Vose Company | Multi-region battery separators |
| US9786885B2 (en) | 2015-04-10 | 2017-10-10 | Hollingsworth & Vose Company | Battery separators comprising inorganic particles |
-
1986
- 1986-12-08 JP JP61291838A patent/JPS63146348A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5225298A (en) * | 1989-02-27 | 1993-07-06 | Yuasa Battery Co., Ltd. | Sealed lead acid battery and separator for use in sealed lead acid battery |
| US5281498A (en) * | 1991-05-23 | 1994-01-25 | Nippon Sheet Glass Co., Ltd. | Sheet-like separator and valve regulated lead acid battery |
| US9293748B1 (en) | 2014-09-15 | 2016-03-22 | Hollingsworth & Vose Company | Multi-region battery separators |
| US9577236B2 (en) | 2014-09-15 | 2017-02-21 | Hollingsworth & Vose Company | Multi-region battery separators |
| US9627668B1 (en) | 2014-09-15 | 2017-04-18 | Hollingsworth & Vose Company | Multi-region battery separators |
| US9728756B2 (en) | 2014-09-15 | 2017-08-08 | Hollingsworth & Vose Company | Multi-region battery separators |
| US10431796B2 (en) | 2014-09-15 | 2019-10-01 | Hollingsworth & Vose Company | Multi-region battery separators |
| US9786885B2 (en) | 2015-04-10 | 2017-10-10 | Hollingsworth & Vose Company | Battery separators comprising inorganic particles |
| US10644289B2 (en) | 2015-04-10 | 2020-05-05 | Hollingsworth & Vose Company | Battery separators comprising inorganic particles |
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