JPH11144761A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JPH11144761A JPH11144761A JP9307172A JP30717297A JPH11144761A JP H11144761 A JPH11144761 A JP H11144761A JP 9307172 A JP9307172 A JP 9307172A JP 30717297 A JP30717297 A JP 30717297A JP H11144761 A JPH11144761 A JP H11144761A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- positive electrode
- electrode
- positive
- lithium ion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリチウムイオン２次
電池、特にリチウムイオン２次電池の構造の改良に関す
る。The present invention relates to a lithium ion secondary battery, and more particularly to an improvement in the structure of a lithium ion secondary battery.
【０００２】[0002]
【従来の技術】従来より、リチウムイオン２次電池とし
ては、正負極がペレット型のコイン型電池が知られてい
る。特開平５−２８９８６号公報には、このようなコイ
ン型リチウムイオン２次電池が開示されている。2. Description of the Related Art Conventionally, as a lithium ion secondary battery, a coin type battery having positive and negative electrodes in a pellet type has been known. Japanese Patent Application Laid-Open No. 5-28986 discloses such a coin-type lithium ion secondary battery.
【０００３】図２には、このようなコイン型リチウムイ
オン２次電池の断面図が示される。図２において、正極
１０及び負極１２がセパレータ１４を介して対向配置さ
れており、これらが正極缶１６と負極缶１８とで構成さ
れた電池ケースの中に収められている。なお、正極缶１
６及び負極缶１８は、ガスケット２０により封止されて
いる。上記従来技術においては、コイン型リチウムイオ
ン２次電池の正極１０と正極缶１６及び負極１２と負極
缶１８との電気的接触を保つために、これらの間に金属
製のメッシュ２２が配置されていた。FIG. 2 is a sectional view of such a coin-type lithium ion secondary battery. In FIG. 2, a positive electrode 10 and a negative electrode 12 are opposed to each other with a separator 14 interposed therebetween, and these are housed in a battery case composed of a positive electrode can 16 and a negative electrode can 18. The positive electrode can 1
6 and the negative electrode can 18 are sealed by a gasket 20. In the prior art, in order to maintain electrical contact between the positive electrode 10 and the positive electrode can 16 and between the negative electrode 12 and the negative electrode can 18 of the coin-type lithium ion secondary battery, a metal mesh 22 is arranged between them. Was.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記従来のコ
イン型リチウムイオン２次電池においては、ペレット状
の正極１０、負極１２及び正極缶１６、負極缶１８及び
金属製のメッシュ２２は、共に固い材料で構成されてい
る。従って、正極１０、負極１２や正極缶１６、負極缶
１８等に少しでも反りがあると、両者の接触が片当たり
の状態となり、接触面積が著しく減少する。このため、
電池としての内部抵抗が大きくなるという問題があっ
た。However, in the above-mentioned conventional coin-type lithium ion secondary battery, the pellet-shaped positive electrode 10, the negative electrode 12, the positive electrode can 16, the negative electrode can 18, and the metal mesh 22 are all hard. It is made of material. Therefore, if the positive electrode 10, the negative electrode 12, the positive electrode can 16, the negative electrode can 18 and the like have any warpage, the contact between them becomes one-sided, and the contact area is significantly reduced. For this reason,
There was a problem that the internal resistance as a battery increased.
【０００５】また、金属製のメッシュ２２は、上述のと
おり固い材料であるので、正極缶１６及び負極缶１８を
かしめる際に正極１０、負極１２が割れたり、あるいは
欠けたりする問題があった。Further, since the metal mesh 22 is a hard material as described above, there is a problem that the positive electrode 10 and the negative electrode 12 are cracked or chipped when the positive electrode can 16 and the negative electrode can 18 are caulked. .
【０００６】本発明は、上記従来の課題に鑑みなされた
ものであり、その目的は、正負極と正極缶負極缶との電
気的接触を確実にでき、かつ正極、負極が割れることを
防止できる構造を有するリチウムイオン２次電池を提供
することにある。The present invention has been made in view of the above-mentioned conventional problems, and has as its object to ensure that the positive and negative electrodes and the positive and negative electrodes can be in electrical contact with each other and prevent the positive and negative electrodes from breaking. An object of the present invention is to provide a lithium ion secondary battery having a structure.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、正負極がペレット型のリチウムイオン２
次電池において、正極と正極缶との間及び負極と負極缶
との間に、表面が導電体で覆われた弾性体が配置されて
いることを特徴とする。In order to achieve the above-mentioned object, the present invention provides a lithium ion secondary battery in which the positive and negative electrodes are pellet-type lithium ions.
In the following battery, an elastic body whose surface is covered with a conductor is disposed between the positive electrode and the positive electrode can and between the negative electrode and the negative electrode can.
【０００８】[0008]
【発明の実施の形態】以下、本発明の実施の形態（以下
実施形態という）を図面に従って説明する。Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.
【０００９】図１には、本発明に係るリチウムイオン２
次電池の断面図が示される。図１においては、図２に示
された従来例と同様に、正極１０及び負極１２がセパレ
ータ１４を介して対向配置されている。この正極１０
は、例えばＬｉＭｎ2Ｏ4、ＬｉＮｉＯ2、ＬｉＣｏＯ2等
の活物質が、カーボンブラック等の導電化剤とＰＶＤＦ
等の結着剤と共に混練され、ペレット化されたものであ
る。また、負極１２は、天然黒鉛、ソフトカーボン、ハ
ードカーボン等の活物質が、ＰＶＤＦ等の結着剤と共に
混練され、ペレット化されたものである。これらの正極
１０、負極１２、セパレータ１４が、正極缶１６及び負
極缶１８とにより構成された電池ケース内に収められて
いる。なお、正極缶１６及び負極缶１８は、ガスケット
２０により封止されている。FIG. 1 shows a lithium ion 2 according to the present invention.
A sectional view of the secondary battery is shown. 1, a positive electrode 10 and a negative electrode 12 are arranged to face each other with a separator 14 interposed therebetween, as in the conventional example shown in FIG. This positive electrode 10
For example, an active material such as LiMn 2 O 4 , LiNiO 2 , and LiCoO 2 is mixed with a conductive agent such as carbon black and PVDF.
And kneaded together with a binder such as The negative electrode 12 is obtained by kneading an active material such as natural graphite, soft carbon, and hard carbon together with a binder such as PVDF and pelletizing the mixture. The positive electrode 10, the negative electrode 12, and the separator 14 are housed in a battery case including a positive electrode can 16 and a negative electrode can 18. The positive electrode can 16 and the negative electrode can 18 are sealed with a gasket 20.
【００１０】図１において特徴的な点は、正極１０と正
極缶１６との間及び負極１２と負極缶１８との間に、表
面が導電体２４で被われた弾性体２６が配置されている
点である。導電体２４としては、正極側では、例えばニ
ッケルメッキ又はニッケル箔が使用され、負極側では、
例えば銅メッキ又は銅箔が使用される。また、弾性体２
６としては、例えばＮＢＲ、ＥＰＤＭ、シリコーンゴム
等のゴム状の弾性体が使用される。この場合、正極１０
と正極缶１６、負極１２と負極缶１８との間の導通は、
弾性体２６の表面の導電体２４によって得ることができ
る。A characteristic point in FIG. 1 is that an elastic body 26 whose surface is covered with a conductor 24 is disposed between the positive electrode 10 and the positive electrode can 16 and between the negative electrode 12 and the negative electrode can 18. Is a point. On the positive electrode side, for example, nickel plating or nickel foil is used as the conductor 24, and on the negative electrode side,
For example, copper plating or copper foil is used. Also, the elastic body 2
As the material 6, a rubber-like elastic material such as NBR, EPDM, or silicone rubber is used. In this case, the positive electrode 10
And between the positive electrode can 16 and the negative electrode 12 and the negative electrode can 18,
It can be obtained by the conductor 24 on the surface of the elastic body 26.
【００１１】このような構成とすることにより、例えば
正極１０あるいは負極１２のペレットや、正極缶１６、
負極缶１８が反っていても、弾性体２６が柔軟性を有す
るため、その接触面全てで正負極１０、１２及び正極缶
１６、負極缶１８との接触を得ることができる。このた
め、接触面積が十分に維持され、リチウムイオン２次電
池の内部抵抗の増加を防止することができる。With such a configuration, for example, pellets of the positive electrode 10 or the negative electrode 12, the positive electrode can 16,
Even if the negative electrode can 18 is warped, the elastic body 26 has flexibility, so that contact with the positive and negative electrodes 10, 12 and the positive electrode can 16 and the negative electrode can 18 can be obtained on all contact surfaces. Therefore, the contact area is sufficiently maintained, and an increase in the internal resistance of the lithium ion secondary battery can be prevented.
【００１２】また、正負極１０、１２及び正極缶１６、
負極缶１８と直接接触するのは柔軟性を有する弾性体２
６であるので、正極缶１６と負極缶１８との間の応力を
緩和することができる。これにより、正極缶１６と負極
缶１８とをかしめる際の正負極１０、１２のペレットの
割れ等を防止することができる。The positive and negative electrodes 10, 12 and the positive electrode can 16,
The elastic body 2 having flexibility is in direct contact with the negative electrode can 18.
6, the stress between the positive electrode can 16 and the negative electrode can 18 can be reduced. This can prevent cracks and the like of the pellets of the positive and negative electrodes 10 and 12 when the positive electrode can 16 and the negative electrode can 18 are swaged.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
弾性体により正極と正極缶との間及び負極と負極缶との
間の接触面積を十分に確保でき、リチウムイオン２次電
池の内部抵抗の増加を防止できる。また、弾性体によ
り、正極缶と負極缶とをかしめる際の応力が緩和され、
正極及び負極のペレットが割れることを防止することが
できる。As described above, according to the present invention,
The elastic body can ensure a sufficient contact area between the positive electrode and the positive electrode can and between the negative electrode and the negative electrode can, and can prevent an increase in the internal resistance of the lithium ion secondary battery. In addition, due to the elastic body, stress when caulking the positive electrode can and the negative electrode can is relaxed,
Cracking of the positive and negative electrode pellets can be prevented.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明に係るリチウムイオン２次電池の断面
図を示す図である。FIG. 1 is a cross-sectional view of a lithium ion secondary battery according to the present invention.
【図２】 従来におけるリチウムイオン２次電池の断面
図である。FIG. 2 is a cross-sectional view of a conventional lithium ion secondary battery.
１０ 正極、１２ 負極、１４ セパレータ、１６ 正
極缶、１８ 負極缶、２０ ガスケット、２２ メッシ
ュ、２４ 導電体、２６ 弾性体。Reference Signs List 10 positive electrode, 12 negative electrode, 14 separator, 16 positive electrode can, 18 negative electrode can, 20 gasket, 22 mesh, 24 conductor, 26 elastic body.
Claims (1)
次電池において、正極と正極缶との間及び負極と負極缶
との間に、表面が導電体で覆われた弾性体が配置されて
いることを特徴とするリチウムイオン２次電池。1. A lithium ion 2 having a positive electrode and a negative electrode of a pellet type.
In a secondary battery, an elastic body whose surface is covered with a conductor is disposed between a positive electrode and a positive electrode can and between a negative electrode and a negative electrode can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9307172A JPH11144761A (en) | 1997-11-10 | 1997-11-10 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9307172A JPH11144761A (en) | 1997-11-10 | 1997-11-10 | Lithium ion secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11144761A true JPH11144761A (en) | 1999-05-28 |
Family
ID=17965911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9307172A Pending JPH11144761A (en) | 1997-11-10 | 1997-11-10 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11144761A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015064951A (en) * | 2013-09-24 | 2015-04-09 | 株式会社豊田自動織機 | Power storage device and power storage module |
| WO2020066323A1 (en) | 2018-09-26 | 2020-04-02 | マクセルホールディングス株式会社 | Flat solid-state battery and method for manufacturing same |
| WO2021192978A1 (en) * | 2020-03-23 | 2021-09-30 | Fdk株式会社 | Alkaline storage battery |
| WO2022102639A1 (en) | 2020-11-13 | 2022-05-19 | マクセル株式会社 | All-solid-state battery |
-
1997
- 1997-11-10 JP JP9307172A patent/JPH11144761A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015064951A (en) * | 2013-09-24 | 2015-04-09 | 株式会社豊田自動織機 | Power storage device and power storage module |
| WO2020066323A1 (en) | 2018-09-26 | 2020-04-02 | マクセルホールディングス株式会社 | Flat solid-state battery and method for manufacturing same |
| JPWO2020066323A1 (en) * | 2018-09-26 | 2021-03-18 | マクセルホールディングス株式会社 | Flat all-solid-state battery and its manufacturing method |
| JP2022000865A (en) * | 2018-09-26 | 2022-01-04 | マクセル株式会社 | Flat type all-solid battery and manufacturing method thereof |
| WO2021192978A1 (en) * | 2020-03-23 | 2021-09-30 | Fdk株式会社 | Alkaline storage battery |
| WO2022102639A1 (en) | 2020-11-13 | 2022-05-19 | マクセル株式会社 | All-solid-state battery |
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