JP6056514B2 - battery - Google Patents
battery Download PDFInfo
- Publication number
- JP6056514B2 JP6056514B2 JP2013018698A JP2013018698A JP6056514B2 JP 6056514 B2 JP6056514 B2 JP 6056514B2 JP 2013018698 A JP2013018698 A JP 2013018698A JP 2013018698 A JP2013018698 A JP 2013018698A JP 6056514 B2 JP6056514 B2 JP 6056514B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- insulating member
- power generation
- generation element
- hole
- 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.)
- Active
Links
- 238000010248 power generation Methods 0.000 claims description 55
- 238000002347 injection Methods 0.000 claims description 40
- 239000007924 injection Substances 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 36
- 238000009413 insulation Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 description 26
- 239000003792 electrolyte Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000011255 nonaqueous electrolyte Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012466 permeate Substances 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002904 solvent 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Cell Separators (AREA)
- Filling, Topping-Up Batteries (AREA)
- Secondary Cells (AREA)
Description
本発明は、電池、詳しくは電池ケースと発電要素との間にシート状絶縁部材を備えた電池に関する。 The present invention relates to a battery, and more particularly to a battery including a sheet-like insulating member between a battery case and a power generation element.
電池は、一般に、発電要素を電池ケースに収納した後、電池ケースの注液口から電解液が注液され、注液口を封止栓で封口することによって製造される。 Generally, a battery is manufactured by storing a power generation element in a battery case, injecting an electrolyte from a liquid inlet of the battery case, and sealing the liquid inlet with a sealing plug.
多くの電池では、金属製の電池ケースが使用されている。電池ケースが導電性を有する場合、発電要素と電池ケースとが直接的または間接的に接触して、短絡が発生する虞がある。このような短絡防止のために、発電要素と電池ケースとの間の絶縁を確保する必要があり、例えば発電要素を絶縁部材で覆う手法が用いられる。 In many batteries, a metal battery case is used. When the battery case has electrical conductivity, the power generation element and the battery case may be in direct or indirect contact with each other, causing a short circuit. In order to prevent such a short circuit, it is necessary to ensure insulation between the power generation element and the battery case. For example, a method of covering the power generation element with an insulating member is used.
上記の絶縁部材として様々な部材が用いられており、例えば、非多孔質なシート状絶縁部材や多孔質なシート状絶縁部材が用いられうる。
非多孔質なシート状絶縁部材で発電要素を覆う場合、電解液を注液する際に電解液が絶縁部材を通過しにくく、電解液が円滑に発電要素に浸透しないことが起こりうる。その結果、電解液が発電要素全体に浸透せず、電解液の浸透ムラが生じる。そして、発電要素内で電解液が浸透していない部分が存在すると、その部分に存在する活物質は充放電反応に寄与することはなく、電池の容量減少につながる。
Various members are used as the insulating member, and for example, a non-porous sheet-like insulating member or a porous sheet-like insulating member can be used.
When the power generation element is covered with the non-porous sheet-like insulating member, when the electrolytic solution is injected, the electrolytic solution hardly passes through the insulating member, and the electrolytic solution may not smoothly penetrate into the power generating element. As a result, the electrolytic solution does not permeate the entire power generating element, resulting in uneven permeation of the electrolytic solution. If there is a portion where the electrolytic solution does not permeate in the power generation element, the active material present in the portion does not contribute to the charge / discharge reaction, leading to a reduction in battery capacity.
一方、多孔質なシート状絶縁部材で発電要素を覆う場合は、電解液がシート状絶縁部材を通過できるため、上記のような問題は生じにくい。しかしながら、シート状絶縁部材が多孔質な材料であるため、電解液がシート状絶縁部材に吸収および保持されて、その保持された分の電解液が発電要素に浸透しないおそれがある。その結果、シート状絶縁部材に吸収および保持された分だけ過剰な電解液が必要となり、電池価格や電池重量の面で不利になる。 On the other hand, when the power generation element is covered with a porous sheet-like insulating member, the electrolyte solution can pass through the sheet-like insulating member, and thus the above-described problems are unlikely to occur. However, since the sheet-like insulating member is a porous material, the electrolytic solution is absorbed and held by the sheet-like insulating member, and the retained amount of the electrolytic solution may not permeate the power generation element. As a result, an excessive amount of electrolytic solution is required by the amount absorbed and retained by the sheet-like insulating member, which is disadvantageous in terms of battery price and battery weight.
本発明は、上記事案を鑑みてなされたものであり、発電要素と電池ケースとの間の絶縁を確保しつつ、電解液が効率よく発電要素全体に浸透し、かつ、過剰な電解液が不要である電池を提供することを目的とする。 The present invention has been made in view of the above-described case, and while ensuring insulation between the power generation element and the battery case, the electrolyte efficiently penetrates the entire power generation element and does not require an excessive electrolyte. It aims at providing the battery which is.
本発明の電池は、注液口を有する電池ケースと、発電要素と、前記電池ケースと前記発電要素との間にシート状絶縁部材とが備えられ、前記シート状絶縁部材は非多孔質材料であり、前記シート状絶縁部材には孔が設けられており、前記注液口と前記孔とが対向していることを特徴とする。 The battery of the present invention includes a battery case having a liquid injection port, a power generation element, and a sheet-like insulating member between the battery case and the power generation element, and the sheet-like insulating member is made of a non-porous material. In addition, the sheet-like insulating member is provided with a hole, and the liquid injection port and the hole face each other.
上記構成のように、発電要素と電池ケースとの間にシート状絶縁部材を備えることで、発電要素と電池ケースとの間の絶縁を確保し、そして電池ケースの注液口と対向するシート状絶縁部材の一部に孔を設けることで、電解液を前記孔を介してシート状絶縁部材を通過させて、電解液を発電要素全体に浸透させることができる。そして、シート状絶縁部材を非多孔質にすることで、電解液がシート状絶縁部材に吸収されるのを防ぎ、かつ、発電要素に浸透した電解液が発電要素の外部に流出するのを防ぐことができる。その結果、余分な電解液が不要となり、電解液を効率良く発電要素全体に浸透させることができる。なお、非多孔質なシート状絶縁部材とは、その空孔率が１０％以下（０％も含む）のシート状絶縁部材を示す。本発明において非多孔質か否かは空孔率によって判断され、空孔率は式（１）により算出される。
空孔率＝｛１−（Ｗ／ρ）／（Ｌ１×Ｌ２×ｔ） 式（１）
Ｗ ： 試験片重量
ρ ： 試験片密度
Ｌ１ ： 試験片幅（側面における長さ）
Ｌ２ ： 試験片全長（平面における上記Ｌ１とは異なる辺の長さ）
ｔ ： 試験片厚み（側面における上記Ｌ１とは異なる辺の長さ）
As in the above configuration, by providing a sheet-like insulating member between the power generation element and the battery case, the insulation between the power generation element and the battery case is ensured, and the sheet shape faces the liquid injection port of the battery case. By providing a hole in a part of the insulating member, the electrolytic solution can pass through the sheet-like insulating member through the hole, and the electrolytic solution can permeate the entire power generating element. By making the sheet-like insulating member non-porous, the electrolytic solution is prevented from being absorbed by the sheet-like insulating member, and the electrolytic solution that has permeated the power generation element is prevented from flowing out of the power generation element. be able to. As a result, an unnecessary electrolytic solution is not required, and the electrolytic solution can efficiently penetrate into the entire power generation element. The non-porous sheet-like insulating member refers to a sheet-like insulating member having a porosity of 10% or less (including 0%). In the present invention, whether or not it is non-porous is determined by the porosity, and the porosity is calculated by the equation (1).
Porosity = {1- (W / ρ) / (L1 × L2 × t) Formula (1)
W: Test piece weight
ρ: Test piece density
L1: Specimen width (length on side surface)
L2: Full length of test specimen (length of side different from L1 on plane)
t: Test piece thickness (length of side different from L1 on side surface)
本発明の電池において、前記孔が複数設けられることが好ましい。 In the battery of the present invention, it is preferable that a plurality of the holes are provided.
上記構成では、シート状絶縁部材に孔が、注液口に対向して設けられており、前記孔が複数設けられている。そのため、シート状絶縁部材に覆われた発電要素を電池ケースに収納した際、仮に、電池ケース注液口とシート状絶縁部材に形成された孔との位置関係が多少ずれても、注液される電解液は円滑にシート状絶縁部材上の孔を通過することが可能となる。 In the above configuration, a hole is provided in the sheet-like insulating member so as to face the liquid injection port, and a plurality of the holes are provided. Therefore, when the power generation element covered with the sheet-like insulating member is stored in the battery case, the liquid is injected even if the positional relationship between the battery case inlet and the hole formed in the sheet-like insulating member is slightly deviated. The electrolyte solution can smoothly pass through the holes on the sheet-like insulating member.
本発明の電池において、前記孔の直径は前記注液口の直径に対して３〜５倍であることが好ましい。 In the battery of the present invention, the diameter of the hole is preferably 3 to 5 times the diameter of the liquid injection port.
上記構成では、シート状絶縁部材に孔が、注液口に対向して設けられており、前記孔の直径が前記注液口の直径の３〜５倍の大きさになっている。そのため、シート状絶縁部材に覆われた発電要素を電池ケースに収納した際、仮に、電池ケース注液口とシート状絶縁部材に形成された孔との位置関係が多少ずれても、注液される電解液は円滑にシート状絶縁部材上の孔を通過することが可能となる。 In the said structure, the hole is provided in the sheet-like insulating member facing the liquid injection port, and the diameter of the said hole is 3-5 times the diameter of the said liquid injection port. Therefore, when the power generation element covered with the sheet-like insulating member is stored in the battery case, the liquid is injected even if the positional relationship between the battery case inlet and the hole formed in the sheet-like insulating member is slightly deviated. The electrolyte solution can smoothly pass through the holes on the sheet-like insulating member.
本発明の電池によれば、発電要素と電池ケースとの間の絶縁を確保しつつ、電解液が効率よく発電要素全体に浸透し、かつ、過剰な電解液を不要にすることができる。 According to the battery of the present invention, while ensuring insulation between the power generation element and the battery case, the electrolyte can efficiently penetrate into the entire power generation element, and an excessive electrolyte can be made unnecessary.
本発明の電池の実施形態を図１〜５に基づいて説明する。本実施形態では、電池として非水電解質電池（リチウムイオン電池）を例示して説明する。なお、本発明を実施する形態は、以下に記載する実施形態に制限されるものではない。 An embodiment of a battery according to the present invention will be described with reference to FIGS. In the present embodiment, a nonaqueous electrolyte battery (lithium ion battery) will be described as an example. The embodiment for carrying out the present invention is not limited to the embodiment described below.
＜第１実施形態＞
第１実施形態の非水電解質電池１を図１に示す。非水電解質電池１は、有底矩形状に形成されて、開口部を有する金属製の筐体２ａと、前記開口部に被せられて溶接される金属製の蓋部２ｂから構成される電池ケース２を有している。金属製の蓋部２ｂは短冊状の長方形に形成されており、金属製の筐体２ａは全体として扁平な直方体形状を有する。金属製の筐体２ａには、電池ケース２内に電解液を注入するための注液口２ｃが設けられており、注液口２ｃは直径１．２ｍｍの円形の孔である。また、図１に示される非水電解質電池の寸法（端子部分を除く）は、幅１６６ｍｍ、高さ１１９ｍｍ、厚み２３ｍｍである。
<First Embodiment>
A nonaqueous electrolyte battery 1 according to the first embodiment is shown in FIG. The nonaqueous electrolyte battery 1 is formed in a bottomed rectangular shape and includes a metal casing 2a having an opening and a metal lid 2b that is covered with the opening and welded. 2 has. The metal lid 2b is formed in a strip-like rectangle, and the metal casing 2a has a flat rectangular parallelepiped shape as a whole. The metal casing 2a is provided with a liquid injection port 2c for injecting an electrolyte into the battery case 2, and the liquid injection port 2c is a circular hole having a diameter of 1.2 mm. The dimensions (excluding the terminal portion) of the nonaqueous electrolyte battery shown in FIG. 1 are a width of 166 mm, a height of 119 mm, and a thickness of 23 mm.
非水電解質電池１において、筐体２ａと電解液を除いた状態を図２に示す。発電要素３の両側のそれぞれに正極接続部５および負極接続部７が溶接され、それぞれの接続部は正極端子および負極端子に接続されている。正極端子および負極端子はそれぞれ電池ケースの蓋部２ｂ上に形成されている。 In the nonaqueous electrolyte battery 1, a state in which the casing 2a and the electrolytic solution are removed is shown in FIG. The positive electrode connecting portion 5 and the negative electrode connecting portion 7 are welded to both sides of the power generation element 3, and the respective connecting portions are connected to the positive electrode terminal and the negative electrode terminal. The positive electrode terminal and the negative electrode terminal are each formed on the lid 2b of the battery case.
長尺帯状のアルミニウム箔および銅箔の表裏両面に正極活物質および負極活物質をそれぞれ塗布して活物質層を形成した後、正極板および負極板の間にセパレータを挟んだ状態で巻回することによって発要要素３が作製される。正極板および負極板は、いずれも短幅方向に活物質を塗布せずにアルミニウム箔および銅箔が露出した未塗工部３ａが形成されており、巻回する際は、正極板の未塗工部３ａと負極板の未塗工部３ａとが幅方向で反対方向に配置され、正極板の未塗工部３ａと負極板の未塗工部３ａとが発電要素３の両端に露出した状態となる。 By forming the active material layer by applying the positive electrode active material and the negative electrode active material to both the front and back surfaces of the long strip-shaped aluminum foil and copper foil, respectively, by winding with the separator sandwiched between the positive electrode plate and the negative electrode plate The essential element 3 is produced. Each of the positive electrode plate and the negative electrode plate is formed with an uncoated portion 3a in which the aluminum foil and the copper foil are exposed without applying an active material in the short width direction. The working part 3a and the uncoated part 3a of the negative electrode plate are arranged in opposite directions in the width direction, and the uncoated part 3a of the positive electrode plate and the uncoated part 3a of the negative electrode plate are exposed at both ends of the power generating element 3. It becomes a state.
その後、発電要素３の両端から突出した正極板の活物質未塗工部３ａおよび負極板の活物質未塗工部３ａを、それぞれ正極接続部５および負極接続部７に溶接する。そして、正極接続部５および負極接続部７をそれぞれ正極端子および負極端子につなぐことで、図２のように蓋部２ｂと発電要素３とが接続された状態となる。 Thereafter, the positive electrode active material uncoated portion 3 a and the negative electrode active material uncoated portion 3 a protruding from both ends of the power generation element 3 are welded to the positive electrode connecting portion 5 and the negative electrode connecting portion 7, respectively. Then, by connecting the positive electrode connection portion 5 and the negative electrode connection portion 7 to the positive electrode terminal and the negative electrode terminal, respectively, the lid portion 2b and the power generation element 3 are connected as shown in FIG.
本発明の第１実施形態のシート状絶縁部材４を図３に示す。シート状絶縁部材４は、非多孔質な材料からなり、具体的には空孔率０％で、厚み０．２ｍｍのポリプロピレン（ＰＰ）である。また、シート状絶縁部材４には、発電要素３を筐体２ａに挿入した際の注液口２ｃに対向する部分に孔４ａが複数形成されている。孔の直径は０．２ｍｍであり、注液口２ｃの直径の０．１７倍である。 FIG. 3 shows the sheet-like insulating member 4 according to the first embodiment of the present invention. The sheet-like insulating member 4 is made of a non-porous material, and specifically, is polypropylene (PP) having a porosity of 0% and a thickness of 0.2 mm. Further, the sheet-like insulating member 4 is formed with a plurality of holes 4a in a portion facing the liquid injection port 2c when the power generating element 3 is inserted into the housing 2a. The diameter of the hole is 0.2 mm, which is 0.17 times the diameter of the liquid injection port 2c.
本発明の第１実施形態では、シート状絶縁部材４上に、注液口２ｃの中心点を中心にして、注液口２ｃの直径の１０倍の大きさの直径範囲内に直径０．２ｍｍの孔４ａを２０００個設けている。ここでいう、シート状絶縁部材４上における注液口２ｃの１０倍の直径範囲（半径６ｍｍの円の範囲）の面積は３６πｍｍ２であり、シート状絶縁部材４上のその範囲内に形成する孔４ａの合計面積は２０πｍｍ２である。すなわち、シート状絶縁部材４上における注液口２ｃの１０倍の直径範囲の面積（３６πｍｍ２）に対して、シート状絶縁部材４上に形成する孔４ａの合計面積（２０πｍｍ２）は、５６％の割合を占める。 In the first embodiment of the present invention, on the sheet-like insulating member 4, the diameter is 0.2 mm within a diameter range of 10 times the diameter of the liquid injection port 2c with the center point of the liquid injection port 2c as the center. 2000 holes 4a are provided. Here, the area of the diameter range of 10 times the injection hole 2c on the sheet-like insulating member 4 (range of a circle having a radius of 6 mm) is 36πmm 2 , and is formed within that range on the sheet-like insulating member 4. The total area of the holes 4a is 20πmm 2 . That is, the total area (20πmm 2 ) of the holes 4a formed on the sheet-like insulating member 4 is 56 with respect to the area (36πmm 2 ) of the diameter range 10 times the injection port 2c on the sheet-like insulating member 4. % Of the total.
シート状絶縁部材４上における注液口２ｃの１０倍の直径範囲の面積に対して、シート状絶縁部材４上に形成する孔４ａの合計面積を、３０〜９０％の割合とすることが好ましい。この割合になるように孔４ａを形成することで、電解液を注液する際、たとえ１つの孔を通過しない電解液が生じても、その電解液が直接別の孔を通過する、もしくは電解液がシート状絶縁部材４に付着してシートをつたい、別の孔に到達して通過することで、発電要素に浸透しない電解液が生じることを低減することが可能になる。 It is preferable that the total area of the holes 4a formed on the sheet-like insulating member 4 is set to a ratio of 30 to 90% with respect to the area of the diameter range of 10 times the injection port 2c on the sheet-like insulating member 4. . By forming the holes 4a so as to have this ratio, even when an electrolyte solution that does not pass through one hole is generated when the electrolyte solution is injected, the electrolyte solution passes directly through another hole or is electrolyzed. When the liquid adheres to the sheet-like insulating member 4 and joins the sheet and reaches and passes through another hole, it is possible to reduce the generation of an electrolyte that does not penetrate into the power generation element.
また、１つの孔４ａの孔径は、注液口２ｃの孔径の０．０５〜０．３倍の大きさであることが好ましい。１つの孔４ａの孔径が注液口２ｃの孔径の０．０５倍の大きさより小さい場合、孔４ａを通過しない電解液が生じる虞が高くなる。一方、１つの孔４ａの孔径が注液口２ｃの孔径の０．３倍の大きさより大きい場合、密接して孔４ａを設けられず、そして孔４ａの個数が減少することから、孔４ａを通過しない電解液が生じる虞が高くなる。 Moreover, it is preferable that the hole diameter of one hole 4a is 0.05 to 0.3 times the hole diameter of the injection hole 2c. When the hole diameter of one hole 4a is smaller than 0.05 times the hole diameter of the liquid injection port 2c, there is a high possibility that an electrolyte that does not pass through the hole 4a is generated. On the other hand, when the hole diameter of one hole 4a is larger than 0.3 times the hole diameter of the liquid injection port 2c, the holes 4a cannot be provided closely, and the number of holes 4a is reduced. There is a high risk that an electrolyte that does not pass through will be generated.
図３において点線で示した箇所を谷折りにすることで、シート状絶縁部材４を有底矩形筒体状に形成する。この有底矩形筒体状に形成されたシート状絶縁部材４の内側に発電要素３を配することで、発電要素３を非多孔質なシート状絶縁部材４で覆う形態とする。また、広げた状態のシート状絶縁部材４の上に発電要素３を置いた後に、図３の点線で示した箇所を折り曲げることで発電要素３を非多孔質なシート状絶縁部材４で覆う形態としてもよい。すなわち、シート状絶縁部材４を筒体状に形成した後に発電要素３を挿入してもよいし、シート状絶縁部材４の上に発電要素３に置いた後にシート状絶縁部材４を筒体状に形成してもよい。 The sheet-like insulating member 4 is formed into a bottomed rectangular cylindrical shape by making the portion indicated by the dotted line in FIG. 3 into a valley fold. By arranging the power generating element 3 inside the sheet-like insulating member 4 formed in the shape of a bottomed rectangular cylinder, the power generating element 3 is covered with the non-porous sheet-like insulating member 4. Further, after the power generation element 3 is placed on the sheet-like insulating member 4 in the spread state, the power generation element 3 is covered with the non-porous sheet-like insulating member 4 by bending a portion indicated by a dotted line in FIG. It is good. In other words, the power generation element 3 may be inserted after the sheet-like insulating member 4 is formed in a cylindrical shape, or after the sheet-like insulating member 4 is placed on the power generation element 3 on the sheet-like insulating member 4, the sheet-like insulating member 4 is cylindrical. You may form in.
図５に示すように、シート状絶縁部材４で発電要素３を覆う際、有底矩形筒体状にしたシート状絶縁部材４の開口側に蓋部２ｂが配置されるようにする。シート状絶縁部材４に形成された孔４ａと筐体２ａに形成された注液口２ｃとが対向するように、シート状絶縁部材４で覆われた発電要素３を筐体２ａに収納した後に、筐体２ａの開口部と蓋部２ｂを溶接する。そして、注液口２ｃから電解液を注液し、注液口２ｃを封口することで非水電解質電池１が完成される。 As shown in FIG. 5, when covering the electric power generation element 3 with the sheet-like insulating member 4, the cover part 2b is arrange | positioned at the opening side of the sheet-like insulating member 4 made into the bottomed rectangular cylinder shape. After housing the power generation element 3 covered with the sheet-like insulating member 4 in the casing 2a so that the hole 4a formed in the sheet-like insulating member 4 and the liquid injection port 2c formed in the casing 2a face each other. The opening of the housing 2a and the lid 2b are welded. And the nonaqueous electrolyte battery 1 is completed by injecting electrolyte solution from the injection port 2c, and sealing the injection port 2c.
＜第２実施形態＞
次に、本発明の第２実施形態について説明する。
本発明の第２実施形態は、上記第１実施形態とは、シート状絶縁部材４上に形成する孔４ａの形態が異なる。そして、それ以外の各部の構成は、上記第１実施形態のものと同一の構成を有しており、説明を省略する。
Second Embodiment
Next, a second embodiment of the present invention will be described.
2nd Embodiment of this invention differs from the said 1st Embodiment in the form of the hole 4a formed on the sheet-like insulating member 4. FIG. And the structure of each part other than that has the same structure as the thing of the said 1st Embodiment, and abbreviate | omits description.
第２実施形態では、注液口と対向するシート状絶縁部材４の部分に１つの孔４ａが設けられている。孔４ａの直径は６ｍｍであり、注液口２ｃの直径の５倍の大きさである。 In 2nd Embodiment, the one hole 4a is provided in the part of the sheet-like insulating member 4 facing a liquid injection port. The diameter of the hole 4a is 6 mm, which is five times the diameter of the liquid injection port 2c.
シート状絶縁部材４に形成された孔４ａの直径は、注液口の直径に対して３〜５倍であることが好ましい。シート状絶縁部材４で覆われた発電要素３を筐体２ａに収納した際、筐体２ａの注液口２ｃに対向する部分にシート状絶縁部材４に形成された孔４ａが必ずしも配置されるとは限らない。そのため、発電要素３を筐体２ａに収納する際の筐体２ａに対する発電要素３の配置の精度が高くなくても、シート状絶縁部材４に注液口の直径より大きい直径を有する孔４ａを設けることで、シート状絶縁部材４に阻害されて孔４ａを通過せずに発電要素に浸透することのない電解液が生じる可能性が低くすることができる。 The diameter of the hole 4a formed in the sheet-like insulating member 4 is preferably 3 to 5 times the diameter of the liquid injection port. When the power generation element 3 covered with the sheet-like insulating member 4 is housed in the housing 2a, the hole 4a formed in the sheet-like insulating member 4 is necessarily arranged in a portion of the housing 2a that faces the liquid injection port 2c. Not necessarily. Therefore, the hole 4a having a diameter larger than the diameter of the liquid injection port is formed in the sheet-like insulating member 4 even if the accuracy of the arrangement of the power generation element 3 with respect to the case 2a when the power generation element 3 is stored in the case 2a is not high. By providing, it is possible to reduce the possibility that an electrolytic solution that is inhibited by the sheet-like insulating member 4 and does not pass through the hole 4a and does not penetrate into the power generation element is generated.
以上のように本発明の第１実施形態、および第２実施形態では、発電要素３の両端に接続された正極接続部５、負極接続部７および発電要素３が電池ケースと接触して短絡しないように、正極接続部５および負極接続部７が接続された状態の発電要素３がシート状絶縁部材４によって覆われる。しかし、注液口２ｃから電解液を注液する際、注液口２ｃと発電要素３との間には非多孔質のシート状絶縁部材４が存在していると、電解液の発電要素３への浸透が阻害される。本発明では、注液口２ｃと発電要素３との間に存在するシート状絶縁部材４の一部に孔４ａを設けることにより、非多孔質のシート状絶縁部材４を用いた場合でも電解液の発電要素３への浸透が阻害されるのを防ぐことができる。なお、正極板と負極板との間に備えられるセパレータの空孔率は一般的に３０〜６０％であり、セパレータを本発明のシート状絶縁部材４として用いた場合、電解液がシート状絶縁部材４に吸収されて過剰の電解液が必要となる。 As described above, in the first embodiment and the second embodiment of the present invention, the positive electrode connecting portion 5, the negative electrode connecting portion 7 and the power generating element 3 connected to both ends of the power generating element 3 are in contact with the battery case and do not short-circuit. As described above, the power generation element 3 in a state where the positive electrode connection portion 5 and the negative electrode connection portion 7 are connected is covered with the sheet-like insulating member 4. However, when the non-porous sheet-like insulating member 4 exists between the injection port 2c and the power generation element 3 when the electrolyte is injected from the injection port 2c, the power generation element 3 of the electrolyte is present. Penetration into the body is inhibited. In the present invention, by providing a hole 4a in a part of the sheet-like insulating member 4 existing between the liquid injection port 2c and the power generation element 3, even when the non-porous sheet-like insulating member 4 is used, the electrolytic solution Can be prevented from penetrating into the power generation element 3. In addition, the porosity of the separator provided between the positive electrode plate and the negative electrode plate is generally 30 to 60%. When the separator is used as the sheet-like insulating member 4 of the present invention, the electrolytic solution is sheet-like insulating. Excess electrolyte is required by being absorbed by the member 4.
本実施形態では、注液口２ｃは、筐体２ａの側面のうち面積が大きい方の面に設けてある。しかしながら、注液口２ｃを設ける箇所は特に制限されるものではなく、注液口２ｃと発電要素３との間にシート状絶縁部材があれば、例えば、注液口２ｃは、筐体２ａの底面部や、蓋部２ｂ上に設けてもよい。 In the present embodiment, the liquid injection port 2c is provided on the surface having the larger area among the side surfaces of the housing 2a. However, the location where the liquid injection port 2c is provided is not particularly limited, and if there is a sheet-like insulating member between the liquid injection port 2c and the power generation element 3, for example, the liquid injection port 2c is connected to the housing 2a. You may provide on a bottom face part or the cover part 2b.
また、本実施形態ではシート状絶縁部材４としてポリプロピレン（ＰＰ）を用いたが、本発明におけるシート状絶縁部材としては、絶縁性や加工性の観点から、例えば、ポリエチレン（ＰＥ）、ポリフェニレンサルファイド（ＰＰＳ）を用いることができる。 Further, in the present embodiment, polypropylene (PP) is used as the sheet-like insulating member 4. However, as the sheet-like insulating member in the present invention, for example, polyethylene (PE), polyphenylene sulfide ( PPS) can be used.
シート状絶縁部材４を薄膜化すれば、シート状絶縁部材４が占める容積を小さくすることができ、発電要素３の容積を大きくすることができるため、電池容量を大きくすることが可能になる。しかしながら、シート状絶縁部材４を薄くしすぎると、シート状絶縁部材４の強度が低下するため、電池に衝撃等が加わった際にシート状絶縁部材４が破損する可能性がある。シート状絶縁部材４が電池ケース２内で占める体積や、シート状絶縁部材４の強度の観点から、シート状絶縁部材４の厚さは０．１〜０．５ｍｍであることが好ましい。 If the sheet-like insulating member 4 is made thin, the volume occupied by the sheet-like insulating member 4 can be reduced, and the volume of the power generating element 3 can be increased, so that the battery capacity can be increased. However, if the sheet-like insulating member 4 is made too thin, the strength of the sheet-like insulating member 4 is reduced, and thus the sheet-like insulating member 4 may be damaged when an impact or the like is applied to the battery. From the viewpoint of the volume occupied by the sheet-like insulating member 4 in the battery case 2 and the strength of the sheet-like insulating member 4, the thickness of the sheet-like insulating member 4 is preferably 0.1 to 0.5 mm.
シート状絶縁部材４に形成された孔４ａの形成手法は、特に制限されるものではない。例えば、孔４ａの径を有した針状物でシート状絶縁部材４をパンチングする手法、もしくはシート状絶縁部材４が溶解する溶剤を液滴の大きさを調節して滴下する手法などを用いることができる。 The formation method of the hole 4a formed in the sheet-like insulating member 4 is not particularly limited. For example, a method of punching the sheet-like insulating member 4 with a needle-like object having a diameter of the hole 4a, or a method of dropping a solvent in which the sheet-like insulating member 4 is dissolved by adjusting the size of the droplet is used. Can do.
発電要素３をシート状絶縁部材４で覆う形態は、上記の本実施形態に制限されるものではない。本実施形態では、シート状絶縁部材４を有底矩形筒体状に成形して発電要素３を覆う形態を示したが、それ以外に、例えば、集電体の接続部が接続された発電要素３をシート状絶縁部材４で巻回する形態や、シート状絶縁部材４を予め袋状に成形してその袋状に発電要素３を収納する形態でもよい。 The form which covers the electric power generation element 3 with the sheet-like insulating member 4 is not restrict | limited to said this embodiment. In the present embodiment, the form in which the sheet-like insulating member 4 is formed into a bottomed rectangular cylindrical shape to cover the power generation element 3 is shown, but in addition to this, for example, the power generation element to which the connecting portion of the current collector is connected 3 may be wound around the sheet-like insulating member 4, or the sheet-like insulating member 4 may be formed into a bag shape in advance and the power generation element 3 may be stored in the bag shape.
また、上記実施形態では、扁平形巻回型の発電要素３を備えた非水電解質電池について説明したが、発電要素や電池の形態や種類は任意であり、実施形態で示した巻回型の発電要素に限定されない。 Moreover, although the said embodiment demonstrated the nonaqueous electrolyte battery provided with the flat winding type electric power generation element 3, the form and kind of an electric power generation element and a battery are arbitrary, and the winding type shown in embodiment is of the winding type. It is not limited to power generation elements.
また、上記実施形態では、金属製の蓋部と筐体から構成される電池ケースを用いた場合を示したが、例えば、金属箔と樹脂層とが積層されたラミネートフィルムなどで構成される電池ケースなどを用いることもできる。 Moreover, in the said embodiment, although the case where the battery case comprised from a metal cover part and a housing | casing was shown, for example, the battery comprised by the laminated film etc. with which metal foil and the resin layer were laminated | stacked Cases can also be used.
１ 非水電解質電池
２ 電池ケース
２ａ 筐体
２ｂ 蓋部
２ｃ 注液口
３ 発電要素
３ａ 活物質合材未塗工部
４ シート状絶縁部材
４ａ 孔
５ 正極接続部
６ 正極端子
７ 負極接続部
８ 負極端子
DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte battery 2 Battery case 2a Case 2b Cover part 2c Injection port 3 Power generation element 3a Active material compound uncoated part 4 Sheet-like insulating member 4a Hole 5 Positive electrode connection part 6 Positive electrode terminal 7 Negative electrode connection part 8 Negative electrode Terminal
Claims (2)
A battery case having a liquid injection port, a power generation element, and a sheet-like insulating member between the battery case and the power generation element, the sheet-like insulating member is a non-porous material, and the sheet-like insulation A hole is provided in the member, the liquid injection port and the hole are opposed to each other, and the diameter of the hole is 3 to 5 times the diameter of the liquid injection port. battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013018698A JP6056514B2 (en) | 2013-02-01 | 2013-02-01 | battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013018698A JP6056514B2 (en) | 2013-02-01 | 2013-02-01 | battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2014149996A JP2014149996A (en) | 2014-08-21 |
| JP6056514B2 true JP6056514B2 (en) | 2017-01-11 |
Family
ID=51572809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2013018698A Active JP6056514B2 (en) | 2013-02-01 | 2013-02-01 | battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6056514B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020090409A1 (en) * | 2018-10-29 | 2020-05-07 | 三洋電機株式会社 | Rectangular electricity storage device |
| JP7318333B2 (en) * | 2019-06-13 | 2023-08-01 | 株式会社Ｇｓユアサ | Storage element |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5127386B2 (en) * | 2007-09-28 | 2013-01-23 | 株式会社東芝 | Square non-aqueous electrolyte battery |
| JP4470124B2 (en) * | 2008-06-13 | 2010-06-02 | トヨタ自動車株式会社 | battery |
| JP2011049064A (en) * | 2009-08-27 | 2011-03-10 | Toshiba Corp | Battery |
| KR101116577B1 (en) * | 2010-02-03 | 2012-02-24 | 에스비리모티브 주식회사 | Secondary battery and method thereof |
| JP2011171079A (en) * | 2010-02-17 | 2011-09-01 | Toshiba Corp | Battery cell |
| JP5777093B2 (en) * | 2011-06-30 | 2015-09-09 | 株式会社東芝 | Secondary battery and method for manufacturing secondary battery |
-
2013
- 2013-02-01 JP JP2013018698A patent/JP6056514B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014149996A (en) | 2014-08-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6339592B2 (en) | Battery cell including step structure | |
| US9929445B2 (en) | Incorporating reference electrodes into battery pouch cells | |
| CN103996806B (en) | Charge storage element and electrical storage device | |
| JP6284532B2 (en) | Battery cell including electrode assembly with offset arrangement | |
| KR102411957B1 (en) | A method for manufacturing an electrode stack for a battery cell, and a battery cell | |
| JP2017069207A (en) | Lithium ion secondary battery and manufacturing method for the same | |
| JP2011054555A (en) | Electrode assembly, and rechargeable battery with the same | |
| JP6063049B2 (en) | Battery cell having a housing cover plate with a raised central region | |
| JP6638315B2 (en) | Lithium ion capacitor | |
| KR102238367B1 (en) | electrode assembly and secondary battery having electrode assembly | |
| JP2015088605A (en) | Method of manufacturing power storage device and power storage device | |
| JP2017183539A (en) | Electrochemical device | |
| JP2015185470A (en) | Power storage element | |
| CN108028350B (en) | Electrochemical energy storage device | |
| KR101357931B1 (en) | Secondary battery | |
| JP6056514B2 (en) | battery | |
| JP6414577B2 (en) | Stacked battery | |
| JP2017208177A (en) | Power storage element and method of manufacturing power storage element | |
| JP2014203885A (en) | Sealing structure of power storage device and electric double layer capacitor | |
| KR20210039568A (en) | Lithium air battery package | |
| JP6346449B2 (en) | Secondary battery | |
| JP2017183619A (en) | Power storage device | |
| JP5956249B2 (en) | Secondary battery | |
| JP6657565B2 (en) | Storage element | |
| KR102198002B1 (en) | Electrode assembly and secondary battery having the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20151016 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20160817 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20160823 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20161014 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20161108 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20161121 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6056514 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |