JP2019046639A - Sealed electrical storage device - Google Patents

Sealed electrical storage device Download PDF

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JP2019046639A
JP2019046639A JP2017168301A JP2017168301A JP2019046639A JP 2019046639 A JP2019046639 A JP 2019046639A JP 2017168301 A JP2017168301 A JP 2017168301A JP 2017168301 A JP2017168301 A JP 2017168301A JP 2019046639 A JP2019046639 A JP 2019046639A
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electrode
battery
case
storage device
electrode terminal
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JP7205050B2 (en
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雨堤 徹
Toru Amezutsumi
徹 雨堤
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AMAZ TECHNO-CONSULTANT LLC
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AMAZ TECHNO-CONSULTANT LLC
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

To improve a volume energy density by decreasing a useless space making no contribution to power generation mainly around a sealing structure in a sealed electrical storage device.SOLUTION: A sealed electrical storage device comprises: an electrode body (9) including a positive electrode body (3), a negative electrode body (5) and a separator (7); and an outer casing (11) which contains the electrode body (9). The outer casing (11) is provided with: a bottomed cylindrical casing body (13) doubling as one electrode terminal and having, in a bottom part (13a), an insertion-hole (23) to insert the other electrode lead body (21) in; a flat-plate shaped electrode terminal member (15) forming the other electrode terminal; and an adhesive seal member (17) formed from an insulative material, interposed between the flat-plate shaped electrode terminal member (15) and the bottom part (13a) of the casing body (13), and bonding the flat-plate shaped electrode terminal member (15) to an outer surface of the bottom part (13a) of the casing body (13) so as to cover the insertion-hole (23).SELECTED DRAWING: Figure 1

Description

本発明は、例えば電池のような密閉型蓄電装置の内部構造に関する。   The present invention relates to an internal structure of a sealed power storage device such as a battery.

電極体および電解液を収容した外装缶を封口して形成する密閉型電池として、外装缶と外装缶の開口を塞ぐ封口体とを、かしめなどの機械的な圧着により封止するタイプと、レーザ溶接などの溶接によって封止するタイプが一般的に採用されている(例えば、特許文献1,2参照。)。   As a sealed battery formed by sealing an outer can containing an electrode body and an electrolyte solution, a type that seals the outer can and the sealing body that closes the opening of the outer can by mechanical pressure bonding such as caulking, and a laser A type that is sealed by welding such as welding is generally employed (see, for example, Patent Documents 1 and 2).

特開2014−99262号公報JP 2014-99262 A 特開2014−102912号公報JP 2014-102912 A

いずれのタイプにおいても外装缶が一方の電極端子を兼ね、圧着封止タイプでは、絶縁部材を介して外装缶に圧着固定された封口体が他方の電極端子となり、溶接封止タイプでは、封口体に絶縁部材を介して取り付けられた端子部材が他方の電極端子となる。圧着封止タイプでは、絶縁部材を含めたかしめが行われる部分の体積や、封口体自体の体積によって封止部分の体積が増大する。溶接封止タイプでは、溶接封止が行われる部分自体の体積は圧着封止タイプに比べて低減されるものの、溶接代分の体積はなお必要であるし、端子部材と封口体との間の絶縁部材の体積も小さいとはいえない。また、いずれのタイプにおいても、電極体上部におけるリードタブの取り回しなどのための無駄な空間(デッドスペース)が存在している。このように、従来の密閉式電池では、封止構造周辺の体積低減が十分になされていない。   In any type, the outer can also serves as one electrode terminal. In the crimping and sealing type, the sealing body that is crimped and fixed to the outer can via an insulating member becomes the other electrode terminal, and in the welding and sealing type, the sealing body is the sealing body. The terminal member attached via the insulating member is the other electrode terminal. In the pressure sealing type, the volume of the sealing portion increases depending on the volume of the portion including the insulating member that is caulked and the volume of the sealing body itself. In the welded seal type, the volume of the portion where the weld seal is performed is reduced as compared with the crimped seal type, but the volume for the welding allowance is still necessary, and between the terminal member and the sealing body It cannot be said that the volume of the insulating member is small. In any type, there is a useless space (dead space) for handling the lead tabs on the upper part of the electrode body. Thus, in the conventional sealed battery, the volume around the sealing structure is not sufficiently reduced.

本発明の目的は、上記の課題を解決するために、密閉型蓄電装置における、主として封止構造周辺の、電力生成に寄与しない無駄な空間を低減して体積エネルギー密度を向上させることにある。   In order to solve the above-described problems, an object of the present invention is to improve a volume energy density by reducing a useless space that does not contribute to power generation mainly in the vicinity of a sealing structure in a sealed power storage device.

前記した目的を達成するために、本発明に係る密閉型蓄電装置は、正極体と負極体とがセパレータを介して積層または捲回されてなる電極体と、前記電極体を収納する外装ケースと、
を備える密閉型蓄電装置であって、
前記外装ケースが、
一方の電極の端子を兼ねる有底筒状のケース本体であって、底部に他方の電極のリード体を挿通させる挿通孔を有するケース本体と、
他方の電極の端子を構成する平板状電極端子部材と、
前記平板状電極端子部材と前記ケース本体の底部との間に介在して、前記平板状電極端子部材を、前記挿通孔を覆うように前記ケース本体の底部の外表面に接着させる、絶縁性素材で形成された接着性のシール部材と、
を有している。
In order to achieve the above-described object, a sealed power storage device according to the present invention includes an electrode body in which a positive electrode body and a negative electrode body are stacked or wound via a separator, and an outer case that houses the electrode body. ,
A sealed power storage device comprising:
The outer case is
A bottomed cylindrical case body that also serves as a terminal of one electrode, and a case body having an insertion hole through which the lead body of the other electrode is inserted at the bottom,
A plate-like electrode terminal member constituting the terminal of the other electrode;
An insulating material that is interposed between the flat electrode terminal member and the bottom of the case main body and adheres the flat electrode terminal member to the outer surface of the bottom of the case main body so as to cover the insertion hole. An adhesive seal member formed of
have.

この構成によれば、有底筒状のケース本体の開口部側でなく、底部側に電極端子部材を配置するので、圧着や溶接といった接合が不要となり、さらに、接着性のシール部材および平板状の電極端子部材によって端子側の封止を行うので、密閉型蓄電装置における封止構造周辺の無駄な空間を大幅に削減することが可能となる。   According to this configuration, the electrode terminal member is disposed not on the opening side of the bottomed cylindrical case body but on the bottom side, so that joining such as crimping or welding is unnecessary, and further, an adhesive seal member and a flat plate shape Since the terminal side is sealed by the electrode terminal member, it is possible to greatly reduce the useless space around the sealing structure in the sealed power storage device.

本発明の一実施形態において、前記外装ケースが、さらに、前記ケース本体の底部と反対側に形成された開口部に溶接によって接合された、ほぼ平板状の蓋板部材を有していてもよい。この構成によれば、ケース本体の、電極端子部材が配置される底部と反対側の部分に蓋板部材を配置して溶接により接合するので、蓋板部材の構造を簡素化することができる。その結果として蓄電装置全体の寸法が低減されるとともに、組立工程も簡易化することができる。   In one embodiment of the present invention, the exterior case may further include a substantially flat lid member joined by welding to an opening formed on the side opposite to the bottom of the case body. . According to this configuration, the cover plate member is disposed on the portion of the case body opposite to the bottom where the electrode terminal member is disposed and joined by welding, so that the structure of the cover plate member can be simplified. As a result, the overall size of the power storage device is reduced, and the assembly process can be simplified.

本発明の一実施形態において、前記シール材がヒートシール材であってもよい。この構成によれば、ヒートシール部材を用いて封止を行うことにより、従来の封止構造と遜色ない密閉性を、比較的簡易な工程によって実現することができる。   In one embodiment of the present invention, the sealing material may be a heat sealing material. According to this configuration, by performing the sealing using the heat seal member, it is possible to realize a sealing performance comparable to the conventional sealing structure by a relatively simple process.

以上のように、本発明に係る密閉型蓄電装置によれば、主として封止構造周辺の、電力生成に寄与しない無駄な空間が低減されるので、体積エネルギー密度が向上する。   As described above, according to the sealed power storage device according to the present invention, the useless space that does not contribute to power generation mainly around the sealing structure is reduced, so that the volume energy density is improved.

本発明の第1実施形態に係る密閉型蓄電装置を示す部分破断断面図である。1 is a partially broken cross-sectional view illustrating a sealed power storage device according to a first embodiment of the present invention. 本発明の第2実施形態に係る密閉型蓄電装置を示す部分破断断面図である。It is a partially broken sectional view which shows the sealed electrical storage apparatus which concerns on 2nd Embodiment of this invention. 本発明の一実施例に係る電池の放電特性を示すグラフである。It is a graph which shows the discharge characteristic of the battery which concerns on one Example of this invention.

以下、本発明に係る実施形態を図面に従って説明するが、本発明はこれらの実施形態に限定されるものではない。   Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.

図1に、本発明の第1実施形態に係る密閉型蓄電装置を示す。本実施形態に係る密閉型蓄電装置は、円筒形の電池、より具体的にはリチウムイオン二次電池(以下、単に「電池1」という。)として構成されている。   FIG. 1 shows a sealed power storage device according to the first embodiment of the present invention. The sealed power storage device according to this embodiment is configured as a cylindrical battery, more specifically, as a lithium ion secondary battery (hereinafter simply referred to as “battery 1”).

電池1は、正極体3と負極体5とをセパレータ7を介して捲回してなる電極体9と、電極体9を収納する外装ケース11とを備えている。本実施形態における外装ケース11は、有底筒状(この例では有底円筒状)のケース本体13と、平板状電極端子部材15と、シール部材17と、蓋板部材19とを備えている。   The battery 1 includes an electrode body 9 formed by winding a positive electrode body 3 and a negative electrode body 5 with a separator 7 interposed therebetween, and an outer case 11 that houses the electrode body 9. The exterior case 11 in the present embodiment includes a bottomed cylindrical (bottomed cylindrical in this example) case main body 13, a flat electrode terminal member 15, a seal member 17, and a lid plate member 19. .

ケース本体13は金属(この例ではアルミニウム合金)製であり、一方の電極の端子、この例では正極端子を兼ねている。ケース本体13の底部13a(同図における上部)には、他方の電極の集電のためのリード体21、この例では負極リード体21を挿通させる挿通孔23を有している。挿通孔23は、ケース本体13の底部13aの中央部に、この底部13aを貫通する貫通孔として形成されている。   The case main body 13 is made of metal (in this example, an aluminum alloy), and also serves as a terminal of one electrode, in this example, a positive electrode terminal. A bottom body 13a (upper part in the figure) of the case body 13 has an insertion hole 23 through which the lead body 21 for collecting the other electrode, in this example, the negative electrode lead body 21 is inserted. The insertion hole 23 is formed as a through hole penetrating the bottom portion 13 a at the center of the bottom portion 13 a of the case body 13.

電極体9は、巻き芯を兼ねる負極リード体21の回りにシート状の負極体5、セパレータ7および正極体3が捲回された捲回体として形成されている。負極リード体21は、第1絶縁体25を介して挿通孔23の内周面と絶縁された状態で、挿通孔23からケース本体13の外部へ挿通されている。本実施形態における負極リード体21としては、中空のピン状部材であるスプリングピンを使用している。後に説明するように、本実施形態で採用する構造を有する電池において、捲回型電極体9のリード体21兼巻き芯として中空のピン状部材を使用した場合、電池の組立工程において、このリード体21の中空部21aを利用して電解液の注入を容易に行うことができる。   The electrode body 9 is formed as a wound body in which a sheet-like negative electrode body 5, a separator 7, and a positive electrode body 3 are wound around a negative electrode lead body 21 that also serves as a winding core. The negative electrode lead body 21 is inserted from the insertion hole 23 to the outside of the case body 13 while being insulated from the inner peripheral surface of the insertion hole 23 via the first insulator 25. As the negative electrode lead body 21 in the present embodiment, a spring pin which is a hollow pin-shaped member is used. As will be described later, in the battery having the structure employed in this embodiment, when a hollow pin-shaped member is used as the lead body 21 and the winding core of the wound electrode body 9, this lead is used in the battery assembly process. The electrolyte solution can be easily injected using the hollow portion 21a of the body 21.

第1絶縁体25は、より具体的には、円盤状の基部25aと、基部25aの中心部に設けられた突起部25bとを有する。突起部25bの中心部に負極リード体21を挿通および嵌合させる嵌合孔27が形成されている。このように構成された第1絶縁体25は、基部25aがケース本体13の底部13aの底面に接し、突起部25bがケース本体13の挿通孔23に嵌合された状態でケース本体13の内側に取り付けられている。第1絶縁体25の突起部25bの嵌合孔27に負極リード体21が嵌合、挿通されている。また、第1絶縁体25の基部25aによって、負極体5とケース本体13の底部13aとの絶縁が図られている。   More specifically, the first insulator 25 includes a disk-shaped base portion 25a and a protrusion portion 25b provided at the center of the base portion 25a. A fitting hole 27 through which the negative electrode lead body 21 is inserted and fitted is formed at the center of the protrusion 25b. The first insulator 25 configured in this way has the base 25a in contact with the bottom surface of the bottom 13a of the case body 13 and the protrusion 25b fitted into the insertion hole 23 of the case body 13 to the inside of the case body 13. Is attached. The negative electrode lead body 21 is fitted and inserted into the fitting hole 27 of the protrusion 25 b of the first insulator 25. Further, the base 25 a of the first insulator 25 provides insulation between the negative electrode body 5 and the bottom 13 a of the case body 13.

ケース本体13の、底部13aと反対側の端部に形成された開口部13bは蓋板部材19によって閉塞、密閉されている。蓋板部材19はほぼ平板状かつ円盤状に形成された部材である。ここでの「ほぼ平板状」とは、全体として平板形状であるが、強度を確保するための凹凸や開裂型のガス放出弁が設けられていることなどにより完全な平滑面を有しない形状を含むことを意味する。この例では、蓋板部材19は、ケース本体13と同一の金属材料、すなわちアルミニウム合金で形成されている。蓋板部材19は、ケース本体13の開口部13bに、溶接、この例ではレーザ溶接によって接合されている。蓋板部材19の内面には円盤状の第2絶縁体29が設置されており、第2絶縁体29によって蓋板部材19と負極体5および負極リード体21との絶縁が図られている。電極体9は、その外周面に正極体3(正極体3の芯体である金属シート)が露出するように捲回されており、正極体3が直接ケース本体13の内周面13cに接触している。   An opening 13 b formed at the end of the case body 13 opposite to the bottom 13 a is closed and sealed with a lid plate member 19. The cover plate member 19 is a member formed in a substantially flat plate shape and a disk shape. The term “substantially flat plate” as used herein refers to a flat plate shape as a whole, but a shape that does not have a perfectly smooth surface due to the provision of concavities and convexities and a cleavage-type gas release valve for ensuring strength. It means to include. In this example, the cover plate member 19 is formed of the same metal material as the case body 13, that is, an aluminum alloy. The cover plate member 19 is joined to the opening 13b of the case body 13 by welding, in this example, laser welding. A disc-shaped second insulator 29 is provided on the inner surface of the lid plate member 19, and the second insulator 29 insulates the lid plate member 19 from the negative electrode body 5 and the negative electrode lead body 21. The electrode body 9 is wound so that the positive electrode body 3 (metal sheet which is a core body of the positive electrode body 3) is exposed on the outer peripheral surface thereof, and the positive electrode body 3 directly contacts the inner peripheral surface 13c of the case body 13. doing.

負極リード体21の、ケース本体13の外部にわずかに突出した先端には、他方の電極の端子、この例では負極端子を構成する平板状電極端子部材15が接合されている。この例では、スポット溶接によって負極リード体21の先端に平板状電極端子部材15が接合されている。平板状電極端子部材15とケース本体13の底部13aの外表面との間に、絶縁性素材で形成された接着性のシール部材17が介在している。このシール部材17を介して、平板状電極端子部材15が、挿通孔23を覆うようにケース本体13の底部13aの外表面に接着されている。   The tip of the negative electrode lead body 21 slightly protruding outside the case body 13 is joined with a terminal of the other electrode, in this example, a flat electrode terminal member 15 constituting the negative electrode terminal. In this example, the flat electrode terminal member 15 is joined to the tip of the negative electrode lead body 21 by spot welding. An adhesive seal member 17 formed of an insulating material is interposed between the flat electrode terminal member 15 and the outer surface of the bottom portion 13a of the case body 13. Through this seal member 17, the flat electrode terminal member 15 is bonded to the outer surface of the bottom portion 13 a of the case body 13 so as to cover the insertion hole 23.

シール部材17は、中心部に負極端子部材の挿通孔を有する円盤シート状の部材である。シール部材17は、金属製のケース本体13と平板状電極端子部材15間を電気的に絶縁し、かつ接着することが可能であり、さらに当該電池に使用される電解質に対する耐久性を有する任意の素材から形成することができる。本実施形態では、シール部材17はヒートシール材から形成されている。非水系電解質を用いる本実施形態において、ヒートシール材としては、例えば、変性ポリエチレン、変性ポリプロピレン、ポリエチレンナフタレート等の金属接着性樹脂を使用することができる。例えばニッケル水素二次電池のような水溶液系の電解質を用いる電池の場合には、例えばナイロンをヒートシール材として用いることもできる。   The seal member 17 is a disk sheet-like member having an insertion hole for the negative electrode terminal member at the center. The seal member 17 can electrically insulate and bond between the metal case main body 13 and the plate-like electrode terminal member 15, and can have any durability with respect to the electrolyte used in the battery. It can be formed from a material. In the present embodiment, the seal member 17 is formed from a heat seal material. In this embodiment using a non-aqueous electrolyte, for example, a metal adhesive resin such as modified polyethylene, modified polypropylene, or polyethylene naphthalate can be used as the heat seal material. For example, in the case of a battery using an aqueous electrolyte such as a nickel hydride secondary battery, for example, nylon can be used as a heat seal material.

図2に、本発明の第2実施形態に係る密閉型蓄電装置を示す。本実施形態に係る密閉型蓄電装置は、角形の電池1として構成されている。以下、主として第1実施形態と異なる点について説明し、第1実施形態と共通する点については説明を省略する場合がある。   FIG. 2 shows a sealed power storage device according to the second embodiment of the present invention. The sealed power storage device according to this embodiment is configured as a rectangular battery 1. Hereinafter, differences from the first embodiment will be mainly described, and description of points that are common to the first embodiment may be omitted.

本実施形態において、電極体9は、正極体3と負極体5とをセパレータ7を介して積層してなる電極体9である。また、本実施形態における外装ケース11は、有底筒状(この例では有底角筒状)のケース本体13と、平板状電極端子部材15と、シール部材17と、蓋板部材19とを備えている。   In the present embodiment, the electrode body 9 is an electrode body 9 formed by laminating a positive electrode body 3 and a negative electrode body 5 with a separator 7 interposed therebetween. Further, the exterior case 11 in the present embodiment includes a bottomed cylindrical (bottomed rectangular tube in this example) case main body 13, a flat electrode terminal member 15, a seal member 17, and a lid plate member 19. I have.

ケース本体13は金属(この例ではステンレス鋼)製であり、一方の電極の端子、この例では負極端子を兼ねている。ケース本体13の底部13a(同図における上部)には、他方の電極のリード体21、この例では正極リード体21を挿通させる挿通孔23を有している。挿通孔23は、ケース本体13の底部13aの中央部に、この底部13aを貫通する貫通孔として形成されている。   The case body 13 is made of metal (stainless steel in this example), and also serves as a terminal of one electrode, in this example, a negative electrode terminal. The bottom 13a (upper part in the figure) of the case body 13 has an insertion hole 23 through which the lead body 21 of the other electrode, in this example, the positive electrode lead body 21 is inserted. The insertion hole 23 is formed as a through hole penetrating the bottom portion 13 a at the center of the bottom portion 13 a of the case body 13.

電極体9は、矩形シート状の正極体3と負極体5とを、セパレータ7を介して対向するように交互に積層した積層体として形成されている。本実施形態における正極リード体21は、電極体9の最上部に積層された正極体3の芯体である金属シート(この例ではアルミニウム箔)を部分的に切り起こしたタブとして形成されている。このタブ状の正極リード体21は、第1絶縁体25を介して挿通孔23の内周面と絶縁された状態で、挿通孔23からケース本体13の外部へ挿通されている。   The electrode body 9 is formed as a laminate in which rectangular sheet-like positive electrode bodies 3 and negative electrode bodies 5 are alternately laminated so as to face each other with a separator 7 therebetween. The positive electrode lead body 21 in the present embodiment is formed as a tab partially cut and raised from a metal sheet (aluminum foil in this example) that is a core body of the positive electrode body 3 laminated on the uppermost portion of the electrode body 9. . The tab-shaped positive electrode lead body 21 is inserted from the insertion hole 23 to the outside of the case body 13 while being insulated from the inner peripheral surface of the insertion hole 23 via the first insulator 25.

本実施形態では、第1絶縁体25は、シート状の基部25aと、基部25aの中心部に設けられた角筒状の突起部25bとを有する。突起部25bの中心部が正極リード体21を挿通させる挿通孔23が形成されている。このように構成された第1絶縁体25は、基部25aがケース本体13の底部13aの底面に接し、突起部25bがケース本体13の挿通孔23に接着された状態でケース本体13の内側に取り付けられている。   In the present embodiment, the first insulator 25 includes a sheet-like base portion 25a and a rectangular tube-shaped protrusion 25b provided at the center of the base portion 25a. An insertion hole 23 through which the positive electrode lead body 21 is inserted is formed at the center of the protrusion 25b. The first insulator 25 configured in this manner has a base portion 25a in contact with the bottom surface of the bottom portion 13a of the case body 13 and a projection portion 25b adhered to the insertion hole 23 of the case body 13 inside the case body 13. It is attached.

ケース本体13の、底部13aと反対側の端部に形成された開口部13bは蓋板部材19によって閉塞、密閉されている。本実施形態における蓋板部材19は、開口部13bの形状に合わせた、矩形のほぼ平板状に形成された部材である。この例では、蓋板部材19は、ケース本体13と同一の金属材料、すなわちステンレス鋼で形成されている。蓋板部材19の内側面に、電極体9の最下部に積層された負極体5の芯体である金属シート(この例では銅箔)が直接接触している。ケース本体13の内壁面には、図示しない絶縁シートが装着されており、これによって正極体3との絶縁が図られている。   An opening 13 b formed at the end of the case body 13 opposite to the bottom 13 a is closed and sealed with a lid plate member 19. The lid plate member 19 in the present embodiment is a member formed in a substantially flat rectangular shape that matches the shape of the opening 13b. In this example, the cover plate member 19 is formed of the same metal material as the case body 13, that is, stainless steel. A metal sheet (copper foil in this example) that is the core of the negative electrode body 5 laminated on the lowermost part of the electrode body 9 is in direct contact with the inner surface of the lid plate member 19. An insulating sheet (not shown) is attached to the inner wall surface of the case main body 13, and thereby insulation from the positive electrode body 3 is achieved.

正極リード体21の、ケース本体13の外部にわずかに突出した先端には、正極端子を構成する平板状電極端子部材15が接合されている。この例では、スポット溶接によって負極リード体21の先端に平板状電極端子部材15が接合されている。平板状電極端子部材15とケース本体13の底部13aの外表面との間に、絶縁性素材で形成された接着性のシール部材17が介在している。このシール部材17を介して、平板状電極端子部材15が、挿通孔23を覆うようにケース本体13の底部13aの外表面に接着されている。   A plate-like electrode terminal member 15 constituting a positive electrode terminal is joined to a tip of the positive electrode lead body 21 slightly protruding outside the case body 13. In this example, the flat electrode terminal member 15 is joined to the tip of the negative electrode lead body 21 by spot welding. An adhesive seal member 17 formed of an insulating material is interposed between the flat electrode terminal member 15 and the outer surface of the bottom portion 13a of the case body 13. Through this seal member 17, the flat electrode terminal member 15 is bonded to the outer surface of the bottom portion 13 a of the case body 13 so as to cover the insertion hole 23.

シール部材17は、中心部に正極のリード体21の挿通孔を有する短冊形状のシート状部材である。本実施形態では、シール部材17はヒートシール材から形成されている。なお、本実施形態では、第1絶縁体25もシール部材17と同一の素材から形成されている。   The seal member 17 is a strip-shaped sheet-like member having an insertion hole for the positive lead body 21 at the center. In the present embodiment, the seal member 17 is formed from a heat seal material. In the present embodiment, the first insulator 25 is also formed from the same material as the seal member 17.

以上説明した各実施形態に係る密閉式蓄電装置(電池1)によれば、有底筒状のケース本体13の開口部13b側でなく、底部13a側に平板状の電極端子部材15を配置するので、圧着や溶接といった接合が不要となり、さらに、接着性のシール部材17および平板状の電極端子部材15によって端子側の封止を行うので、密閉型蓄電装置における封止構造周辺の無駄な空間を大幅に削減することが可能となる。   According to the sealed power storage device (battery 1) according to each embodiment described above, the plate-like electrode terminal member 15 is disposed not on the opening 13b side of the bottomed cylindrical case body 13 but on the bottom 13a side. Therefore, joining such as crimping or welding is not required, and furthermore, the sealing on the terminal side is performed by the adhesive seal member 17 and the flat electrode terminal member 15, and therefore a wasteful space around the sealing structure in the sealed power storage device. Can be greatly reduced.

なお、上記の説明で示したケース本体13、蓋板部材19、絶縁体25,29、正負極芯体等を形成する素材は例示に過ぎず、電池の種類、仕様等に応じて、一般的に用いられている材料から適宜選択してよい。   Note that the materials forming the case main body 13, the cover plate member 19, the insulators 25 and 29, the positive and negative electrode cores, and the like shown in the above description are merely examples, and are generally used according to the type and specifications of the battery. You may select suitably from the material currently used for.

本発明に係る構造は、外装ケース11内のデッドスペースが特に大きくなりがちな小型電池や扁平形電池、例えば、外形寸法の外径/高さ比が2/3以上の円筒形電池や、最小辺寸法が5mm以下の超扁平形電池、外径が曲面で構成された電池等に適用することが特に効果的である。もっとも、本発明に係る構造は、このような大きさ、形状の電池に限らず、いかなる寸法、形状の密閉型電池にも適用することができる。   The structure according to the present invention is a small battery or a flat battery in which the dead space in the outer case 11 tends to be particularly large, such as a cylindrical battery having an outer diameter / height ratio of 2/3 or more of the outer dimensions, It is particularly effective to apply to an ultra flat battery having a side dimension of 5 mm or less, a battery having a curved outer diameter, and the like. However, the structure according to the present invention can be applied not only to a battery having such a size and shape but also to a sealed battery having any size and shape.

また、各実施形態において、本発明が適用される密閉式蓄電装置として円筒形および角形の電池を例として説明したが、本発明は、例えばキャパシタのような電池以外の密閉式蓄電装置にも適用することができる。   In each embodiment, cylindrical and rectangular batteries have been described as examples of sealed power storage devices to which the present invention is applied. However, the present invention is also applicable to sealed power storage devices other than batteries such as capacitors. can do.

以下の実施例により、本発明をさらに具体的に説明するが、本発明はこれらに限定されるものではない。   The following examples further illustrate the present invention, but the present invention is not limited thereto.

(実施例1電池の作製)
下記の仕様の小型円筒形のリチウムイオン二次電池を作製し、実施例1電池とした。
電池サイズ:φ11.6mm×高さ10.8mm(CR-1/3Nと同サイズ)
外装ケース(ケース本体):アルミニウム合金缶(肉厚0.5mm,底部にφ3.0mmの挿通孔あり)
外装ケース(蓋板部材):アルミニウム合金円板
正極体:活物質 コバルト酸リチウム/芯体 アルミニウム箔(厚み16μm)/電極厚み:115μm/電極サイズ:8.5mm×145mm
負極体:活物質 黒鉛系合剤/芯体 銅箔(厚み16μm)/電極厚み:115μm/電極サイズ:9.5mm×150mm
セパレータ:ポリエチレン微多孔膜(20μm厚)
電解液:EC/DMC=3/7の溶媒に電解質として1MのLiPFを溶解したもの
Example 1 Production of Battery
A small cylindrical lithium ion secondary battery having the following specifications was produced as Example 1 battery.
Battery size: φ11.6mm x Height 10.8mm (same size as CR-1 / 3N)
Exterior case (case body): Aluminum alloy can (thickness 0.5 mm, with a insertion hole of φ3.0 mm at the bottom)
Exterior case (cover plate member): Aluminum alloy disc Positive electrode: Active material Lithium cobaltate / core Aluminum foil (thickness 16 μm) / electrode thickness: 115 μm / electrode size: 8.5 mm × 145 mm
Negative electrode: Active material Graphite-based mixture / core copper foil (thickness 16 μm) / electrode thickness: 115 μm / electrode size: 9.5 mm × 150 mm
Separator: Polyethylene microporous membrane (20 μm thick)
Electrolyte: 1M LiPF 6 dissolved as an electrolyte in a solvent of EC / DMC = 3/7

上記の仕様の円筒形電池を、以下の手順で作製した。   A cylindrical battery having the above specifications was produced by the following procedure.

上記の正極体、負極体とセパレータとを、φ2.0のステンレス製中空スプリングピンを巻芯として捲回し、最外周外側がアルミニウム箔となる電極体9を構成した。設計容量は約50mAhである。   The positive electrode body, the negative electrode body, and the separator were wound using a φ2.0 stainless steel hollow spring pin as a core to form an electrode body 9 in which the outermost outer periphery was an aluminum foil. The design capacity is about 50mAh.

電極体の上下両端にポリプロピレン製の絶縁板(実施形態の第1絶縁体、第2絶縁体)を設置し、ケース本体に挿入した。缶底(実施形態の底部)側には、巻き芯を兼ねる負極リード体であるスプリングピンを挿通させる挿通孔が形成されている。また、第1絶縁体である絶縁板にはφ3.0×0.5mmの突起部も設けられている。第2絶縁体29である絶縁板は単純な円板である。ケース本体の開口部に蓋板部材を嵌合させ、レーザ溶接によってシールした。   Polypropylene insulating plates (first and second insulators in the embodiment) were installed on both upper and lower ends of the electrode body, and inserted into the case body. An insertion hole through which a spring pin that is a negative electrode lead body that also serves as a winding core is inserted is formed on the can bottom (bottom portion of the embodiment) side. The insulating plate, which is the first insulator, is also provided with a protrusion of φ3.0 × 0.5 mm. The insulating plate that is the second insulator 29 is a simple disk. A lid plate member was fitted into the opening of the case body and sealed by laser welding.

上記のように外装ケースに電極体を挿入したものを100℃で1時間真空乾燥した。その後、ドライボックス内で電解液をスプリングピンの中空孔から所定量注液した。注液後に所定時間放置した後、容量の10%に相当する電気量を充電し、ガスを発生させた。その後、予め片面にヒートシール材がシールされたニッケル円板(実施形態の平板状電極端子部材)でケース本体の底部にヒートシールして封止した。この組立体をドライボックスから取り出した後、ニッケル円板とスプリングピンをスポット溶接で接合し、規定の初期充放電を行って完成電池とした。   The electrode case inserted into the outer case as described above was vacuum-dried at 100 ° C. for 1 hour. Thereafter, a predetermined amount of electrolyte was injected from the hollow hole of the spring pin in the dry box. After being left for a predetermined time after the injection, an amount of electricity corresponding to 10% of the capacity was charged to generate gas. Then, it heat-sealed and sealed to the bottom part of the case main body with the nickel disc (flat electrode terminal member of embodiment) by which the heat seal material was previously sealed on one side. After the assembly was taken out of the dry box, the nickel disk and the spring pin were joined by spot welding, and prescribed initial charge / discharge was performed to complete the battery.

(電池内部空間の比較)
実施例1電池と、これと同サイズのCR-1/3N電池の内部空間を比較した結果を下表1に示す。なお、リチウムイオン二次電池である実施例1電池と、リチウム1次電池であるCR-1/3N電池では電池系が異なるが、内部空間という構造面の比較を行うため、実施例1電池と同サイズのCR-1/3N電池を比較例電池として比較する。
(Comparison of battery internal space)
The results of comparing the internal space of the Example 1 battery and the CR-1 / 3N battery of the same size are shown in Table 1 below. In addition, although the battery system is different between the battery of Example 1 which is a lithium ion secondary battery and the CR-1 / 3N battery which is a lithium primary battery, in order to compare the structural aspect of the internal space, the battery of Example 1 A CR-1 / 3N battery of the same size is compared as a comparative battery.


実施例1電池では、比較例電池に比べて電極の有効幅を約20%増加させることができた。このような電極の有効幅の増大は、電池容量の増大に直接寄与する。また、実施例電池では捲回された電極体の外周に露出させた芯体を直接ケース本体の内周面に接触させているのに対し、比較例電池では電極体と外装ケースとの間に内缶を介在させていることから、実施例1電池では、比較例電池に比べて、外装ケース内径と電極体の外径とのギャップが低減される。実施例1電池では、電極体の外径を比較例電池の電極体よりも0.4〜0.5mm程度大きくすることが可能である。この外径寸法は今回試作した電極体仕様で半周〜1周分に相当する。最外周の1周分は容量に対する寄与率が大きく、φ10mmの外周と想定した場合で電極が30mm程度延長できることになり、実施例1電池では30%程度の容量増に相当する。これらの結果から、実施例1電池の構造では、従来品に比べて、電池内の無駄な空間を大幅に減少させることができ、体積エネルギー密度を向上させるために極めて効果的であることが理解される。   In the battery of Example 1, the effective width of the electrode could be increased by about 20% compared to the comparative battery. Such an increase in the effective width of the electrode directly contributes to an increase in battery capacity. Further, in the example battery, the core exposed on the outer periphery of the wound electrode body is directly in contact with the inner peripheral surface of the case body, whereas in the comparative example battery, the core body is interposed between the electrode body and the outer case. Since the inner can is interposed, the gap between the outer diameter of the outer case and the outer diameter of the electrode body is reduced in the battery of Example 1 as compared with the comparative battery. In the battery of Example 1, the outer diameter of the electrode body can be made approximately 0.4 to 0.5 mm larger than the electrode body of the comparative battery. This outer diameter dimension corresponds to half to one turn in the prototype electrode body specification. The contribution to the capacity is large for one circumference of the outermost circumference, and the electrode can be extended by about 30 mm when assuming an outer circumference of φ10 mm, which corresponds to an increase in capacity of about 30% in the battery of Example 1. From these results, it is understood that the structure of the battery of Example 1 can greatly reduce the useless space in the battery as compared with the conventional product, and is extremely effective for improving the volume energy density. Is done.

(保存試験結果)
密閉性の比較を行うため、実施例1電池と、市場で入手可能な3000mAhクラスの18650サイズの円筒形リチウムイオン二次電池と3548120サイズのラミネート電池(リチウムイオン二次電池)とを60℃90%環境下で所定期間保存し、容量劣化率を比較した。下表2にその結果を示す。
(Results of preservation test)
In order to compare the sealing properties, the battery of Example 1 and a commercially available 3000 mAh class 18650 size cylindrical lithium ion secondary battery and a 3548120 size laminated battery (lithium ion secondary battery) were heated at 60 ° C. 90 ° C. It was stored for a predetermined period in% environment and the capacity deterioration rate was compared. The results are shown in Table 2 below.

実施例1電池の保存特性は、大容量の円筒形電池である比較例1電池と比べて遜色のない特性であり、ラミネート電池である比較例2電池と比べるとむしろ良好な特性が得られた。これらの結果から、実施例1電池でも従来の市販電池と比べて遜色のない十分な密閉性が確保できていることが確認された。   The storage characteristics of the battery of Example 1 are inferior to those of Comparative Example 1 which is a large-capacity cylindrical battery, and rather favorable characteristics are obtained compared to Comparative Example 2 which is a laminated battery. . From these results, it was confirmed that the battery of Example 1 was able to secure sufficient hermeticity comparable to that of the conventional commercially available battery.

(実施例2電池の作製)
電池を使用する機器によっては、電池を装着するために実質的に必要となる機器側の体積に対するエネルギー密度の観点から、円筒型電池よりも角形電池が有利となる場合もある。そこで、本発明に係る構造を適用し、実施例2電池として、まだ市場に出ていない下記の仕様の小型角形のリチウムイオン二次電池を作製し、充放電特性を確認した。
電池サイズ:□11.5mm×厚さ5.4mm
外装ケース(ケース本体,蓋板部材):SUS304製(肉厚0.2mm,底部にφ3.0mmの挿通孔あり)
正極体:活物質 コバルト酸リチウム/芯体 アルミニウム箔(厚み15μm)/電極厚み:115μm/電極サイズ:9.5mm×9.0mm
負極体:活物質 黒鉛系合剤/芯体 銅箔(厚み15μm)/電極厚み:115μm/電極サイズ:10.5mm×10.0mm
セパレータ:ポリエチレン微多孔膜(20μm厚)
電解液:EC/DMC=3/7の溶媒に電解質として1MのLiPFを溶解したもの
Example 2 Production of Battery
Depending on the device using the battery, a rectangular battery may be more advantageous than the cylindrical battery from the viewpoint of energy density with respect to the volume on the device side that is substantially necessary for mounting the battery. Therefore, the structure according to the present invention was applied, and a small prismatic lithium ion secondary battery having the following specifications that was not yet on the market was manufactured as Example 2 battery, and the charge / discharge characteristics were confirmed.
Battery size: □ 11.5mm x thickness 5.4mm
Exterior case (case body, cover plate member): Made of SUS304 (thickness 0.2 mm, with insertion hole of φ3.0 mm at the bottom)
Positive electrode body: active material lithium cobalt oxide / core aluminum foil (thickness 15 μm) / electrode thickness: 115 μm / electrode size: 9.5 mm × 9.0 mm
Negative electrode body: active material Graphite-based mixture / core copper foil (thickness 15 μm) / electrode thickness: 115 μm / electrode size: 10.5 mm × 10.0 mm
Separator: Polyethylene microporous membrane (20 μm thick)
Electrolyte: 1M LiPF 6 dissolved as an electrolyte in a solvent of EC / DMC = 3/7

上記の仕様の角形電池を、以下の手順で作製した。   A prismatic battery having the above specifications was produced by the following procedure.

上記の正極体、負極体とセパレータとを、図2に示した態様でそれぞれ5層積層し、最上部に正極芯体であるアルミニウム箔が、最下部に負極芯体である銅箔が配置された積層体である電極体を構成した。設計容量は35mAhである。   The positive electrode body, the negative electrode body, and the separator are laminated in the form shown in FIG. 2, and an aluminum foil that is a positive electrode core is disposed at the top and a copper foil that is a negative electrode core is disposed at the bottom. An electrode body which is a laminated body was constructed. The design capacity is 35mAh.

ケース本体の底部の外表面には、正極の平板状電極端子部材である0.1mm厚のアルミニウムシートがヒートシール材を介してヒートシールされており、これによって挿通孔が封止されている。電極体をケース本体に挿入した後に100℃で1時間真空乾燥し、その後、ドライボックス内で電解液を所定量注液した。注液後に密閉容器内に収納して所定時間放置した後、容量の10%に相当する電気量を充電し、ガスを発生させた。その後、ケース本体の開口部に蓋板部材を嵌合させ、レーザ溶接によってシールした。この組立体をドライボックスから取り出した後、アルミニウムシートと正極リードタブをスポット溶接で接合し、規定の初期充放電を行って完成電池とした。   On the outer surface of the bottom of the case body, a 0.1 mm-thick aluminum sheet, which is a positive electrode terminal member of the positive electrode, is heat-sealed through a heat seal material, thereby sealing the insertion hole. After the electrode body was inserted into the case body, it was vacuum-dried at 100 ° C. for 1 hour, and then a predetermined amount of electrolyte solution was injected in the dry box. After injecting the solution, it was stored in a sealed container and allowed to stand for a predetermined time, and then an amount of electricity corresponding to 10% of the capacity was charged to generate gas. Thereafter, a lid plate member was fitted into the opening of the case body and sealed by laser welding. After the assembly was taken out of the dry box, the aluminum sheet and the positive electrode lead tab were joined by spot welding, and prescribed initial charge / discharge was performed to complete the battery.

(充放電試験結果)
以下の充放電条件で充放電サイクル試験を行った。
・充電:定電流−定電圧:0.2C-4.2V(0.02Cカット)
・放電:定電流:0.2C(3.0Vカット)
この試験における1回目の放電特性を図3に示す。放電容量として3.0Vカットで設計通りの35mAhが得られた。また、500サイクル後の放電容量維持率は約79%であり、実用上問題ないサイクル特性が得られた。
(Charge / discharge test results)
A charge / discharge cycle test was conducted under the following charge / discharge conditions.
・ Charging: Constant current-Constant voltage: 0.2C-4.2V (0.02C cut)
・ Discharge: Constant current: 0.2C (3.0V cut)
FIG. 3 shows the first discharge characteristics in this test. The discharge capacity was 35Vh as designed with a 3.0V cut. In addition, the discharge capacity retention rate after 500 cycles was about 79%, and a cycle characteristic with no practical problem was obtained.

以上のとおり、図面を参照しながら本発明の好適な実施形態を説明したが、本発明の趣旨を逸脱しない範囲内で、種々の追加、変更または削除が可能である。したがって、そのようなものも本発明の範囲内に含まれる。   As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

1 電池
3 正極体
5 負極体
7 セパレータ
9 電極体
11 外装ケース
13 ケース本体
13a ケース本体の底部
13b ケース本体の開口部
15 平板状電極端子部材
17 シール部材
19 蓋板部材
21 リード体
23 挿通孔
DESCRIPTION OF SYMBOLS 1 Battery 3 Positive electrode body 5 Negative electrode body 7 Separator 9 Electrode body 11 Case 13 Case body 13a Case body bottom 13b Case body opening 15 Flat electrode terminal member 17 Seal member 19 Cover plate member 21 Lead body 23 Insertion hole

Claims (3)

正極体と負極体とがセパレータを介して積層または捲回されてなる電極体と、
前記電極体を収納する外装ケースと、
を備える密閉型蓄電装置であって、
前記外装ケースが、
一方の電極の端子を兼ねる有底筒状のケース本体であって、底部に他方の電極のリード体を挿通させる挿通孔を有するケース本体と、
他方の電極の端子を構成する平板状電極端子部材と、
前記平板状電極端子部材と前記ケース本体の底部との間に介在して、前記平板状電極端子部材を、前記挿通孔を覆うように前記ケース本体の底部の外表面に接着させる、絶縁性素材で形成された接着性のシール部材と、
を有する、密閉型蓄電装置。
An electrode body in which a positive electrode body and a negative electrode body are laminated or wound through a separator;
An outer case for housing the electrode body;
A sealed power storage device comprising:
The outer case is
A bottomed cylindrical case body that also serves as a terminal of one electrode, and a case body having an insertion hole through which the lead body of the other electrode is inserted at the bottom,
A plate-like electrode terminal member constituting the terminal of the other electrode;
An insulating material that is interposed between the flat electrode terminal member and the bottom of the case main body and adheres the flat electrode terminal member to the outer surface of the bottom of the case main body so as to cover the insertion hole. An adhesive seal member formed of
A sealed power storage device.
請求項1に記載の密閉型蓄電装置において、前記外装ケースが、さらに、前記ケース本体の底部と反対側に形成された開口部に溶接によって接合された、ほぼ平板状の蓋板部材を有する密閉型蓄電装置。   2. The sealed power storage device according to claim 1, wherein the exterior case further includes a substantially flat lid member joined by welding to an opening formed on the side opposite to the bottom of the case body. Type power storage device. 請求項1または2に記載の密閉型蓄電装置において、前記シール部材がヒートシール材から形成されている密閉型蓄電装置。   3. The sealed power storage device according to claim 1, wherein the seal member is formed of a heat seal material.
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