JP3470051B2 - Lithium secondary battery - Google Patents

Lithium secondary battery

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Publication number
JP3470051B2
JP3470051B2 JP33429198A JP33429198A JP3470051B2 JP 3470051 B2 JP3470051 B2 JP 3470051B2 JP 33429198 A JP33429198 A JP 33429198A JP 33429198 A JP33429198 A JP 33429198A JP 3470051 B2 JP3470051 B2 JP 3470051B2
Authority
JP
Japan
Prior art keywords
lithium secondary
battery
secondary battery
winding core
core
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.)
Expired - Fee Related
Application number
JP33429198A
Other languages
Japanese (ja)
Other versions
JP2000164257A (en
Inventor
明夫 榎本
宏 根本
賢信 鬼頭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP33429198A priority Critical patent/JP3470051B2/en
Priority to US09/415,164 priority patent/US6387561B1/en
Priority to CA002447501A priority patent/CA2447501C/en
Priority to CA002285764A priority patent/CA2285764C/en
Priority to EP99120325A priority patent/EP0994519A3/en
Publication of JP2000164257A publication Critical patent/JP2000164257A/en
Priority to US10/106,748 priority patent/US6858342B2/en
Priority to US10/106,768 priority patent/US20020106553A1/en
Application granted granted Critical
Publication of JP3470051B2 publication Critical patent/JP3470051B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】 本発明は、電池構造が簡単
であって組立が容易であるために生産性に優れるととも
に非水電解液の充填（注入）、排出を容易かつ迅速に行
うことが可能な、特に電気自動車のモータ駆動用電源等
として好適に用いられる耐振動性に優れたリチウム二次
電池に関する。The present invention relates to the excellent productivity because the assembling is easy battery structure is a simple Rutotomo
Filling (injecting) and discharging non-aqueous electrolyte easily and quickly
In particular, the present invention relates to a lithium secondary battery having excellent vibration resistance, which is preferably used as a power source for driving a motor of an electric vehicle.

【０００２】[0002]

【従来の技術】 近年、リチウム二次電池は、携帯電
話、ＶＴＲ、ノート型コンピュータ等の携帯型電子機器
の電源用電池として、広く用いられるようになってきて
いる。また、リチウム二次電池はエネルギー密度が大き
いことから、前記携帯型電子機器のみならず、最近の環
境問題を背景に、低公害車として積極的に一般への普及
が図られている電気自動車（ＥＶ）あるいはハイブリッ
ド電気自動車（ＨＥＶ）のモータ駆動電源としても注目
を集めている。2. Description of the Related Art In recent years, lithium secondary batteries have come to be widely used as power source batteries for portable electronic devices such as mobile phones, VTRs, and notebook computers. In addition, since the lithium secondary battery has a large energy density, not only the portable electronic device but also an electric vehicle that is actively spread to the general public as a low-emission vehicle due to recent environmental problems ( It has also attracted attention as a motor drive power source for EVs or hybrid electric vehicles (HEVs).

【０００３】 代表的なＥＶ用電池としては、図５に示
すような、集電用タブ（以下、「タブ」という。）５Ａ
・５Ｂが取り付けられた正極板２と負極板３とを互いに
接触しないようにセパレータ４を介して、巻芯６の外周
に捲回した捲回型内部電極体１に、非水電解液を含浸さ
せたものを、筒状の電池ケースに収容した構造を有する
電池が挙げられる。ここで、巻芯６の長さは、正極板２
等の幅、即ち、内部電極体１の長さとほぼ同等とされる
ことが一般的である。As a typical EV battery, a current collecting tab (hereinafter referred to as “tab”) 5A as shown in FIG.
The wound type internal electrode body 1 wound around the outer periphery of the winding core 6 is impregnated with the non-aqueous electrolyte through the separator 4 so that the positive electrode plate 2 and the negative electrode plate 3 to which 5B is attached do not contact each other. An example of the battery is a battery having a structure in which the battery is housed in a cylindrical battery case. Here, the length of the winding core 6 is the positive electrode plate 2
It is general that the widths are equal to each other, that is, substantially equal to the length of the internal electrode body 1.

【０００４】 ところで、ＥＶ用電池には、走行時等の
振動にする耐久性の確保が要求される。例えば、内部電
極体１が電池ケース内部で振動したり、移動等すると、
正極板や負極板に塗工された電極活物質が剥離して電池
容量が減少するばかりでなく、剥離した電極活物質が正
極と負極を短絡させるおそれが生ずるため、好ましくな
い。また、内部電極体１の端面が、当初平面状だったも
のが、振動により螺旋状となる等の変形を起こすこと
も、電池反応を不均一とするために好ましいことではな
い。By the way, the EV battery is required to ensure durability against vibration during traveling. For example, when the internal electrode body 1 vibrates or moves inside the battery case,
Not only is the electrode active material applied to the positive electrode plate and the negative electrode plate peeled off, reducing the battery capacity, but also the peeled electrode active material may short-circuit the positive electrode and the negative electrode, which is not preferable. Further, it is not preferable that the end surface of the internal electrode body 1 is initially flat, but is deformed by vibration into a spiral shape or the like to make the battery reaction non-uniform.

【０００５】 そこで、従来の内部電極体１の固定方法
として、特開平９−９２２４１号公報には、図８に示す
ように、円筒形の巻芯３１を用いて電極渦巻体３５（内
部電極体１に相当する。）を作製し、巻芯３１の中空部
に下部表面が絶縁体カラー１５で覆われた極柱２０を差
し込むと共に、極柱２０がキャップ１３にナット１２を
用いて固定された構造を有する電池１０が開示されてい
る。また、特開平１−１７５１７６号公報には、仮の巻
芯を用いて作製した内部電極体から仮の巻芯を取り除
き、代わりに棒状絶縁体を挿入して電池ケースに収容し
た電池構造が開示されている。Therefore, as a conventional fixing method of the internal electrode body 1, in Japanese Patent Laid-Open No. 9-92241, as shown in FIG. 8, an electrode spiral body 35 (internal electrode body) is used by using a cylindrical winding core 31. 1) was prepared, and the pole 20 whose lower surface was covered with the insulator collar 15 was inserted into the hollow portion of the winding core 31 and the pole 20 was fixed to the cap 13 using the nut 12. A battery 10 having a structure is disclosed. Further, JP-A-1-175176 discloses a battery structure in which a temporary winding core is removed from an internal electrode body produced by using a temporary winding core, and a rod-shaped insulator is inserted instead to be housed in a battery case. Has been done.

【０００６】[0006]

【発明が解決しようとする課題】 しかしながら、この
特開平９−９２２４１号公報に開示された電極渦巻体３
５の固定方法においては、電池ケース１７の内周面と極
柱２０が電極渦巻体３５の径方向の移動を抑制するスト
ッパとして機能しているのみであり、径方向への移動が
完全には抑制されていないのみならず、電極渦巻体３５
の長さ方向には極柱２０との間隙幅だけ移動が容易な構
造となっている。ここで、電極渦巻体３５の長さ方向へ
の移動が起こった場合には、電極渦巻体３５が極柱２０
と衝突して、電極渦巻体３５の端面に取り付けられた電
極リード１１（タブ５Ａ・５Ｂに相当する。）が損傷す
るおそれが生ずる。また、電極渦巻体３５の端部におい
て、電極活物質が剥離する等の損傷を受け易くなると考
えられる。However, the electrode spiral body 3 disclosed in Japanese Patent Laid-Open No. 9-92241 is disclosed.
In the fixing method of No. 5, the inner peripheral surface of the battery case 17 and the pole 20 only function as a stopper that suppresses the radial movement of the electrode spiral body 35, and the radial movement is not complete. Not only is it not suppressed, but the electrode spiral 35
The structure is such that it can be easily moved in the longitudinal direction by the width of the gap with the pole 20. Here, when the movement of the electrode spiral body 35 in the length direction occurs, the electrode spiral body 35 is moved to the pole column 20.
There is a risk that the electrode lead 11 (corresponding to the tabs 5A and 5B) attached to the end surface of the electrode spiral body 35 may be damaged due to the collision with. In addition, it is considered that the end portion of the electrode spiral body 35 is likely to be damaged such as peeling of the electrode active material.

【０００７】 一方、特開平１−１７５１７６号公報記
載の発明においては、内部電極体は、電池ケースの内周
面と内部電極体の芯に挿入された絶縁体からなるムク棒
から圧力を受ける形で固定されているのみで、内部電極
体の長さ方向の移動を抑える構造とはなっていない。こ
のように、従来、内部電極体は径方向での固定が重視さ
れ、長さ方向への移動を積極的に抑える工夫はされてい
なかった。On the other hand, in the invention described in Japanese Unexamined Patent Publication No. 1-175176, the internal electrode body is of a type that receives pressure from a solid rod inserted between the inner peripheral surface of the battery case and the core of the internal electrode body. However, it is not a structure that suppresses the movement of the internal electrode body in the length direction. As described above, conventionally, the internal electrode body is prioritized to be fixed in the radial direction, and no measures have been taken to positively suppress the movement in the length direction.

【０００８】 ところで、ＥＶ用電池等では、その生産
性を高めて製造コストを低減することも重要である。こ
こで、先に図８に示した端部構造を有する電池１０にお
いては、電池１０の両端に電解液注入口３２や放圧弁１
９を設ける等、電池１０の端部構造が複雑で部品点数が
多いことや、電極リード１１の極柱２０外周への取付を
レーザ溶接により行っていることや、電池ケース１７と
キャップ１３との境界を溶接により密閉封止することか
ら組立作業性、即ち生産性が必ずしもよいものとは言え
ないと考えられる。By the way, in EV batteries and the like, it is also important to increase the productivity and reduce the manufacturing cost. Here, in the battery 10 having the end structure shown in FIG. 8, the electrolyte injection port 32 and the pressure release valve 1 are provided at both ends of the battery 10.
9, the end structure of the battery 10 is complicated and the number of parts is large, the electrode lead 11 is attached to the outer periphery of the pole 20 by laser welding, and the battery case 17 and the cap 13 are Since the boundary is hermetically sealed by welding, the assembly workability, that is, the productivity is not necessarily good.

【０００９】 更に、図８記載の電池１０の構造におい
ては、電解液の充填は、一端の電解液注入口３２から脱
気を行い、電池内部を減圧した状態において、他端の電
解液注入口３２から電解液を注入する手段が取られ、こ
の作業を数回繰り返すことで行われる。しかし、このよ
うな作業を数回行うことは製造工程上不利であり、しか
も、最終的に封止すべき電解液注入口３２を両端に設け
ることは、電解液の漏洩や気密性の低下を招きやすい点
で不利である。Further, in the structure of the battery 10 shown in FIG. 8, the electrolyte solution is filled with the electrolyte solution by degassing from the electrolyte solution inlet 32 at one end, and the inside of the battery is depressurized, and the electrolyte solution inlet at the other end is filled. The means for injecting the electrolytic solution is taken from 32, and this operation is repeated several times. However, performing such an operation several times is disadvantageous in the manufacturing process, and further, providing the electrolytic solution inlet 32 to be finally sealed at both ends causes leakage of the electrolytic solution and deterioration of airtightness. It is disadvantageous in that it is easy to invite.

【００１０】[0010]

【課題を解決するための手段】 本発明は、このような
従来技術の問題点に鑑みてなされたものであり、その目
的とするところは、内部電極体の径方向及び長さ方向の
耐振動性を向上させると共に非水電解液の充填（注
入）、排出を容易かつ迅速に行うことを可能とし、かつ
電池構造を簡単なものとして組立を容易とし、製造コス
トを低減しつつ、しかも信頼性に優れたリチウム二次電
池を提供することにある。すなわち、本発明によれば、
第一に、正極板と負極板とをセパレータを介して巻芯外
周に捲回してなる内部電極体を筒状の電池ケースに収容
し、非水電解液を用いてなるリチウム二次電池であっ
て、当該巻芯が、その端部に孔部又はスリットを備えた
中空円筒形状を有するとともに、当該電池ケースの端面
を封止する蓋により挟持され、当該電池ケースの内部に
収容、固定されてなり、かつ、当該巻芯の中空部の外延
上において、当該蓋の一方に、当該巻芯の中空部及び当
該孔部又はスリットを流路として、当該非水電解液を注
入、排出するための非水電解液注入口が設けられてなる
ことを特徴とするリチウム二次電池、が提供される。Means for Solving the Problems The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent vibration in the radial direction and the longitudinal direction of the internal electrode body. Of the non-aqueous electrolyte solution (Note)
It is possible to easily and quickly perform insertion and removal , and a simple battery structure that facilitates assembly, reduces manufacturing costs, and provides a highly reliable lithium secondary battery. To provide. That is, according to the present invention,
First, there is a lithium secondary battery in which an internal electrode body formed by winding a positive electrode plate and a negative electrode plate around a winding core via a separator is housed in a cylindrical battery case and a nonaqueous electrolytic solution is used. The core has a hole or a slit at its end.
It has a hollow cylindrical shape and is sandwiched by a lid that seals the end surface of the battery case,
Accommodated and fixed, and the outer extension of the hollow part of the core
Above, the hollow part of the core and the
The non-aqueous electrolyte is poured using the hole or slit as a flow path.
Provided is a lithium secondary battery, which is provided with a non-aqueous electrolyte injection port for inserting and discharging .

【００１１】 この本発明のリチウム二次電池において
は、巻芯として、絶縁材料、又はその表面を当該絶縁材
料によって被覆された金属材料からなるものが好適に用
いられる。 In the lithium secondary battery of the present invention, as the winding core, the insulating material or the surface thereof is the insulating material.
A material made of a metal material coated with a material is preferably used .

【００１２】 また、本発明によれば、第二に、正極板
と負極板とをセパレータを介して巻芯外周に捲回してな
る内部電極体を筒状の電池ケースに収容し、非水電解液
を用いてなるリチウム二次電池であって、当該巻芯の両
端に当該巻芯の長さを延長する絶縁部材が配置されてな
り、当該巻芯及び当該絶縁部材が中空円筒形状を有し、
また当該絶縁部材がその端部に孔部又はスリットを備え
てなるとともに、当該巻芯及び当該絶縁部材が当該電池
ケースの端面を封止する蓋により挟持され、当該電池ケ
ースの内部に収容、固定されてなり、かつ、当該巻芯及
び当該絶縁部材の中空部の外延上において、当該蓋の一
方に、当該巻芯及び当該絶縁部材の中空部並びに当該絶
縁部材の孔部又はスリットを流路として、当該非水電解
液を注入、排出するための非水電解液注入口が設けられ
てなることを特徴とするリチウム二次電池、が提供され
る。Further, according to the present invention, secondly, the internal electrode body formed by winding the positive electrode plate and the negative electrode plate around the outer circumference of the winding core with the separator interposed therebetween is housed in the cylindrical battery case, and the non-aqueous electrolysis is carried out. a lithium secondary battery using a liquid, it insulating member extending the length of the core at both ends of the winding core is arranged
The core and the insulating member have a hollow cylindrical shape,
Further, the insulating member has a hole or a slit at its end.
Together comprising Te, is sandwiched by a lid in which the winding core and the insulating member sealing the end face of the battery case, the cell case
It is housed and fixed inside the base, and the core and
And the outside of the hollow part of the insulating member, one of the lids
The core and the hollow part of the insulating member and the insulation.
Using the hole or slit of the edge member as a flow path, the non-aqueous electrolysis
A non-aqueous electrolyte injection port is provided for injecting and discharging the liquid.
Lithium secondary battery characterized by comprising Te, is provided.

【００１３】[0013]

【００１４】 上述した２種類の本発明のリチウム二次
電池において、蓋の一方に非水電解液注入口を設けたこ
とにより、巻芯及び絶縁部材の中空部を利用して非水電
解液の充填を容易かつ迅速に行うことが可能となる。な
お、この場合、電解液が巻芯の中空部から外部へ流れ出
るように、また、電解液の注入による脱ガスが容易とな
るように、巻芯の端部又は絶縁体の側面には、孔部又は
スリットが設けられている。In the above-mentioned two types of lithium secondary batteries of the present invention, one of the lids is provided with a non-aqueous electrolyte injection port.
This makes it possible to fill the nonaqueous electrolytic solution easily and quickly by utilizing the hollow portion of the winding core and the insulating member. In this case, a hole is provided at the end of the winding core or on the side surface of the insulator so that the electrolytic solution flows out from the hollow portion of the winding core to the outside and the degassing by the injection of the electrolytic solution is facilitated. part or <br/> slits Ru provided Empire.

【００１５】 また、本発明のリチウム二次電池におい
ては、当該電池ケースが、内部電極体の端面と当該蓋と
の間において、当該電池ケースの内周側に突出した突起
部を備えてなることが好ましく、このような突起部は、
電池ケースに絞り加工を施すことで容易に形成すること
ができる。そして、前述した突起部を利用して、蓋をか
しめにより当該電池ケースに固定すると、電池の組立が
簡単となり、好ましい。[0015] Further, in the lithium secondary battery of the present invention, the battery case, between the end face and the lid of the internal electrode body, be provided with a projection which projects to the inner peripheral side of the battery case Is preferred, and such protrusions are
It can be easily formed by subjecting the battery case to drawing. Then, it is preferable to fix the lid to the battery case by caulking it by using the above-mentioned protrusion, because the battery can be easily assembled.

【００１６】 更に、正極板及び負極板にそれぞれ取り
付けられた集電用のタブを１カ所に纏めて接続する集合
接続部を有する内部端子を、その集合接続部が巻芯の外
周から内部電極体の外周に至る領域を巻芯の軸方向に外
延した範囲に位置するようにして、少なくとも１つ蓋に
取り付けることも、電池の構造を簡単なものとして電池
の組立作業を容易ならしめるとともに、電池特性の向上
にも寄与し、好ましい。Furthermore, an internal terminal having a collective connecting portion for collectively connecting the current collecting tabs attached to the positive electrode plate and the negative electrode plate at one location, and the collective connecting portion is provided from the outer periphery of the winding core to the internal electrode body. The battery structure can be made simple by facilitating the battery assembling work by arranging the region extending to the outer periphery of the battery in a range extending in the axial direction of the winding core and attaching it to at least one lid. It is preferable because it contributes to the improvement of the characteristics.

【００１７】 本発明のリチウム二次電池は、こうして
耐振動性に優れる特徴を活かして、電気自動車又はハイ
ブリッド電気自動車のモータ駆動用電源として好適に用
いられ、電池容量が２Ａｈ以上の場合に好適に適用され
る。The lithium secondary battery of the present invention is suitable for use as a power source for driving a motor of an electric vehicle or a hybrid electric vehicle, taking advantage of its excellent vibration resistance, and has a battery capacity of 2 Ah or more. It is preferably applied in the case of.

【００１８】[0018]

【発明の実施の形態】 以下、本発明の実施の形態につ
いて図面を参照しながら説明する。先ず、図１は、本発
明のリチウム二次電池に好適に用いられる内部電極体４
０の構造を示す斜視図である。先に図５に示した内部電
極体１と比較すると、巻芯４１が軸方向に長く、正極板
２及び負極板３の端面から突出した形状を有している。
この内部電極体４０は、正極板２と負極板３とが互いに
接触しないようにセパレータ４を介して巻芯４１の外周
に捲回しつつ、その捲回作業中において、集電用の正極
用タブ５Ａ及び負極用タブ５Ｂを、超音波溶接等の手段
により、それぞれ正極板２及び負極板３に取り付けるこ
とで作製される。Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows an internal electrode body 4 preferably used in the lithium secondary battery of the present invention.
It is a perspective view which shows the structure of 0. Compared with the internal electrode body 1 shown in FIG. 5, the winding core 41 is axially long and has a shape protruding from the end faces of the positive electrode plate 2 and the negative electrode plate 3.
The internal electrode body 40 is wound around the outer periphery of the winding core 41 via the separator 4 so that the positive electrode plate 2 and the negative electrode plate 3 do not come into contact with each other, and a positive electrode tab for collecting current during the winding operation. 5A and the negative electrode tab 5B are attached to the positive electrode plate 2 and the negative electrode plate 3, respectively, by means of ultrasonic welding or the like.

【００１９】 ここで正極用タブ５Ａ及び負極用タブ５
Ｂは、１つのタブの受け持つ集電面積がほぼ等しくなる
ようにほぼ等間隔に取り付けられることが好ましく、更
に捲回後に、内部電極体４０の端面において径方向にほ
ぼ直線上に並ぶように取り付けると、タブの集合接続が
容易となり、好ましい。なお、正極用タブ５Ａにはアル
ミニウム箔が、負極用タブ５Ｂには銅箔が、それぞれ好
適に使用される。Here, the positive electrode tab 5 A and the negative electrode tab 5
It is preferable that Bs are attached at substantially equal intervals so that the current collecting areas covered by one tab are substantially equal, and further, after winding, they are attached so as to be arranged substantially linearly in the radial direction on the end surface of the internal electrode body 40. This is preferable because it facilitates collective connection of tabs. Aluminum foil is preferably used for the positive electrode tab 5A, and copper foil is preferably used for the negative electrode tab 5B.

【００２０】 正極板２は、通常、集電体としてのアル
ミニウム箔やチタン箔の両面に正極活物質を所定厚みに
塗工することで作製され、安価なアルミニウム箔を用い
ることが、コスト面から好ましい。正極活物質の塗工
は、正極活物質粉末に溶剤やバインダ等を添加して作製
されるスラリー或いはペーストを、ロールコータ法等を
用いて塗布、固着させることで行われる。好適に用いら
れる正極活物質としては、マンガン酸リチウムやコバル
ト酸リチウム、ニッケル酸リチウム等のリチウム遷移金
属複合酸化物が挙げられる。なお、正極活物質には、ア
セチレンブラック等の炭素微粉末を導電助材として加え
ることが好ましい。The positive electrode plate 2 is usually produced by applying a positive electrode active material to a predetermined thickness on both sides of an aluminum foil or a titanium foil as a current collector, and it is cost-effective to use an inexpensive aluminum foil. preferable. The positive electrode active material is applied by applying and fixing a slurry or paste prepared by adding a solvent, a binder, etc. to the positive electrode active material powder by using a roll coater method or the like. Examples of the positive electrode active material that is preferably used include lithium transition metal composite oxides such as lithium manganate, lithium cobalt oxide, and lithium nickel oxide. It is preferable to add fine carbon powder such as acetylene black to the positive electrode active material as a conductive additive.

【００２１】 一方、負極板３は、集電体としての銅箔
若しくはニッケル箔の両面に負極活物質を塗工すること
で作製される。その作製方法は前述した正極板２の場合
と同様である。なお、負極活物質としては、ソフトカー
ボンやハードカーボンといったアモルファス系炭素質材
料や、人造黒鉛や天然黒鉛等の高黒鉛化炭素質粉末が用
いられる。On the other hand, the negative electrode plate 3 is manufactured by applying a negative electrode active material to both surfaces of a copper foil or a nickel foil as a current collector. The manufacturing method is similar to that of the positive electrode plate 2 described above. As the negative electrode active material, an amorphous carbonaceous material such as soft carbon or hard carbon, or highly graphitized carbonaceous powder such as artificial graphite or natural graphite is used.

【００２２】 更にセパレータ４としては、マイクロポ
アを有するリチウムイオン透過性のポリエチレンフィル
ム（ＰＥフィルム）を、多孔性のリチウムイオン透過性
のポリプロピレンフィルム（ＰＰフィルム）で挟んだ三
層構造としたものが好適に用いられる。これは、内部電
極体４０の温度が上昇した場合に、ＰＥフィルムが約１
３０℃で軟化してマイクロポアが潰れ、リチウムイオン
の移動すなわち電池反応を抑制する安全機構を兼ねたも
のである。そして、このＰＥフィルムをより軟化温度の
高いＰＰフィルムで挟持することによって、ＰＥフィル
ムが軟化した場合においても、ＰＰフィルムが形状を保
持して正極板２と負極板３の接触・短絡を防止し、電池
反応の確実な抑制と安全性の確保が可能となる。Further, the separator 4 has a three-layer structure in which a lithium ion permeable polyethylene film (PE film) having micropores is sandwiched between porous lithium ion permeable polypropylene films (PP film). It is preferably used. This is because when the temperature of the internal electrode body 40 rises, the PE film is about 1
It also functions as a safety mechanism that suppresses the movement of lithium ions, that is, the battery reaction, by softening at 30 ° C. to crush the micropores. By sandwiching this PE film between PP films having a higher softening temperature, even when the PE film is softened, the PP film retains its shape and prevents contact and short circuit between the positive electrode plate 2 and the negative electrode plate 3. Therefore, it is possible to surely suppress the battery reaction and ensure safety.

【００２３】 なお、内部電極体４０の外周がセパレー
タ４で覆われるようにすると、内部電極体４０を電池ケ
ースに挿入した際に、電池ケースとの絶縁が容易に図
れ、好ましい。また、内部電極体４０が解けないよう
に、内部電極体４０の外周は絶縁テープ等で固定するこ
とが好ましい。It is preferable that the outer periphery of the internal electrode body 40 be covered with the separator 4 because the internal electrode body 40 can be easily insulated from the battery case when the internal electrode body 40 is inserted into the battery case. Further, it is preferable to fix the outer periphery of the internal electrode body 40 with an insulating tape or the like so that the internal electrode body 40 cannot be loosened.

【００２４】 さて、上述した内部電極体４０を用いた
本発明に係るリチウム二次電池の構造の一実施形態を示
す断面図を図２に示す。以下、リチウム二次電池５０
（以下、「電池５０」という。）の構造を、その作製手
順に従って説明することとする。電池５０の作製に当た
って、先ず、内部電極体４０の両端に取り付けられてい
る正極用タブ５Ａ、負極用タブ５Ｂをそれぞれ内部端子
７４Ａ・７４Ｂに接続する。ここで、内部端子とはタブ
を電池内部において中間的に集合接続する部材をいい、
正極用タブ５Ａを接続する内部端子７４Ａにはアルミニ
ウムもしくはアルミニウム合金からなるものが、負極用
タブ５Ｂを接続する内部端子７４Ｂには銅もしくは銅合
金からなるものがそれぞれ好適に用いられる。Now, FIG. 2 is a sectional view showing an embodiment of the structure of the lithium secondary battery according to the present invention using the above-mentioned internal electrode body 40. Hereinafter, the lithium secondary battery 50
The structure of (hereinafter, referred to as "battery 50") will be described in accordance with its manufacturing procedure. In producing the battery 50, first, the positive electrode tab 5A and the negative electrode tab 5B attached to both ends of the internal electrode body 40 are connected to the internal terminals 74A and 74B, respectively. Here, the internal terminals refer to members that collectively and collectively connect the tabs inside the battery,
An internal terminal 74A for connecting the positive electrode tab 5A is preferably made of aluminum or an aluminum alloy, and an internal terminal 74B for connecting the negative electrode tab 5B is preferably made of copper or a copper alloy.

【００２５】 なお、図２における内部端子７４Ａ・７
４Ｂとしては、タブ５Ａ・５Ｂを圧着して接続するリベ
ット状のものが例示されているが、その形状に制限はな
い。また、アルミニウムや銅は、その表面に酸化被膜を
形成し易いことから、この酸化被膜によってタブ５Ａ・
５Ｂと内部端子７４Ａ・７４Ｂとの接触抵抗が大きくな
り、かつ、その値がばらつく場合がある。そこで、接続
部における接触抵抗のばらつきを抑えるために、内部端
子７４Ａ・７４Ｂへのタブ５Ａ・５Ｂの集合接続は、溶
接又はかしめ、もしくはハトメにより行うことが好まし
く、かしめ又はハトメによる場合には、前述した酸化被
膜が破壊されるほどに十分に大きい圧力であって、しか
もタブ５Ａ・５Ｂが破損、損傷しない範囲内に抑えた圧
力をかけて行うことが好ましい。なお、このようなタブ
５Ａ・５Ｂの集合接続の方法について、本発明者らは、
既に特願平１０−１７１１０５号に、その内容を開示し
ている。In addition, the internal terminals 74A.7 in FIG.
As the 4B, a rivet-like one is illustrated in which the tabs 5A and 5B are connected by crimping, but the shape is not limited. Further, since aluminum and copper easily form an oxide film on the surface thereof, the oxide film forms a tab 5A.
The contact resistance between 5B and the internal terminals 74A and 74B may increase and the value may vary. Therefore, in order to suppress the variation of the contact resistance at the connection portion, the collective connection of the tabs 5A and 5B to the internal terminals 74A and 74B is preferably performed by welding, caulking, or eyelets. In the case of caulking or eyelets, It is preferable to apply a pressure that is large enough to break the oxide film described above and that is kept within a range that does not damage or damage the tabs 5A and 5B. Regarding the method of connecting the tabs 5A and 5B collectively, the present inventors have
The contents thereof have already been disclosed in Japanese Patent Application No. 10-171105.

【００２６】 内部端子７４Ａ・７４Ｂは、それぞれ蓋
７１Ａ・７１Ｂに予め取り付けられ、同時に蓋７１Ａ・
７１Ｂには、それぞれ内部端子７４Ａ・７４Ｂが配設さ
れた別の面に外部端子７３Ａ・７３Ｂが取り付けられて
いることが好ましく、このような状態であっても、タブ
５Ａ・５Ｂの集合接続に何ら支障は生じない。ここで蓋
は電池端部を封止する部材であって、その材料としては
アルミニウムや銅といった内部端子と同じ金属材料が好
適に用いられる。また、外部端子は電流を電池外部へ取
り出すための端子部材であり、固体金属材料であればそ
の材質に特に制限はない。The internal terminals 74A and 74B are pre-mounted on the lids 71A and 71B, respectively, and at the same time, the lids 71A and 74B are simultaneously attached.
It is preferable that the external terminals 73A and 73B are attached to the other surfaces of the 71B on which the internal terminals 74A and 74B are arranged. Even in such a state, the tabs 5A and 5B can be connected together. No hindrance will occur. Here, the lid is a member for sealing the end portion of the battery, and as the material thereof, the same metal material as the internal terminal such as aluminum or copper is preferably used. The external terminal is a terminal member for taking out an electric current to the outside of the battery, and the material thereof is not particularly limited as long as it is a solid metal material.

【００２７】 なお、内部端子７４Ａ・７４Ｂを、その
集合接続部が巻芯４１の外周から内部電極体４０の外周
に至る領域を巻芯４１の軸方向に外延した範囲に位置す
るようにして蓋７１Ａ・７１Ｂに取り付けると、タブ５
Ａ・５Ｂを蓋７１Ａ・７１Ｂの外周部に取り付ける場合
等と比較して、全体的なタブ５Ａ・５Ｂの長さを短くし
て抵抗を低減し、電池特性の向上させることができ、好
ましい。また、外部端子７３Ａ・７３Ｂとしては、一方
に雄ネジ、他方に雌ネジを例示しているが、このような
構造とすることで、複数の電池５０の直列接続を簡単
に、かつ接触抵抗が小さくなるように強固に行うことが
できるようになる。It should be noted that the inner terminals 74 A and 74 B are capped so that their collective connecting portions are located in a range extending in the axial direction of the winding core 41 from the outer circumference of the winding core 41 to the outer circumference of the internal electrode body 40. When attached to 71A / 71B, tab 5
Compared with the case where A.5B is attached to the outer peripheral portions of the lids 71A and 71B, etc., the overall length of the tabs 5A and 5B can be shortened to reduce the resistance and the battery characteristics can be improved, which is preferable. In addition, as the external terminals 73A and 73B, a male screw is illustrated on one side and a female screw is illustrated on the other side. With such a structure, the series connection of the plurality of batteries 50 can be easily performed and the contact resistance can be improved. It becomes possible to perform firmly so that it becomes small.

【００２８】 このような特徴を活かすために、内部端
子７４Ａ・７４Ｂと蓋７１Ａ・７１Ｂ及び蓋７１Ａ・７
１Ｂと外部端子７３Ａ・７３Ｂとは、それぞれが溶接に
より接触抵抗が小さくなるように、かつ、強固に接合さ
れていることが好ましい。勿論、一体的に成型されてい
るものも好適に用いられる。このように蓋７１Ａ・７１
Ｂが金属材料からなる場合には、内部端子７４Ａ・７４
Ｂと外部端子７３Ａ・７３Ｂは必然的に導通して電流路
が形成される。この場合、電池端部の構造が簡単なもの
となり、電池の組立作業性の向上が図られる。In order to utilize such characteristics, the internal terminals 74A and 74B, the lids 71A and 71B, and the lids 71A and 7
It is preferable that 1B and the external terminals 73A and 73B are strongly joined together by welding so that the contact resistance becomes small. Of course, those integrally molded are also preferably used. In this way the lid 71A ・ 71
When B is made of a metal material, the internal terminals 74A, 74
B and the external terminals 73A and 73B are inevitably conducted to form a current path. In this case, the structure of the battery end portion is simplified, and the workability of assembling the battery is improved.

【００２９】 これに対し、蓋７１Ａ・７１Ｂとして硬
質樹脂やセラミックといった絶縁材料を用いることも可
能である。但し、この場合には、蓋７１Ａ・７１Ｂの外
周を利用し、又は蓋７１Ａ・７１Ｂを貫通するように電
流路を形成する必要があり、部品形状が複雑となること
や電池の密閉性の低下を招く可能性がある等の問題を免
れない。On the other hand, it is possible to use an insulating material such as hard resin or ceramic for the lids 71A and 71B. However, in this case, it is necessary to use the outer circumference of the lids 71A and 71B or to form a current path so as to penetrate the lids 71A and 71B, which complicates the shape of parts and lowers the airtightness of the battery. There is a problem such as the possibility of causing

【００３０】 こうして、蓋７１Ａ・７１Ｂ等が取り付
けられた内部電極体４０を筒状の電池ケース７２内に挿
入する。電池ケース７２としては、金属製のパイプが好
適に用いられ、アルミニウム製パイプやステンレス製パ
イプが好適に用いられる。このように、電池ケース７２
として金属部材が用いられることから、電池ケース７２
の内面と内部電極体４０の外周との間に絶縁性フィルム
７９を挟み込み、内部電極体４０と電池ケース７２との
導通及びタブ５Ａ・５Ｂと電池ケース７２との導通を防
止することが好ましい。但し、前述したように、セパレ
ータ４で内部電極体４０の外周全体が被覆されている場
合には、内部電極体４０の外周部分においては絶縁性フ
ィルム７９は必ずしも必要ではない。In this way, the internal electrode body 40 to which the lids 71 A and 71 B and the like are attached is inserted into the cylindrical battery case 72. As the battery case 72, a metal pipe is preferably used, and an aluminum pipe or a stainless pipe is preferably used. In this way, the battery case 72
Since a metal member is used as the battery case 72
It is preferable to sandwich an insulating film 79 between the inner surface of the inner electrode body 40 and the outer periphery of the inner electrode body 40 to prevent conduction between the inner electrode body 40 and the battery case 72 and conduction between the tabs 5A and 5B and the battery case 72. However, as described above, when the entire outer periphery of the internal electrode body 40 is covered with the separator 4, the insulating film 79 is not necessarily required in the outer peripheral portion of the internal electrode body 40.

【００３１】 絶縁性フィルム７９の使用の形態にかか
わらず、内部電極体４０の径方向の移動を抑制するため
に、内部電極体４０の挿入が困難でない程度に、内部電
極体４０の外周と電池ケース７２の内面とのクリアラン
スを小さくすることが好ましく、更に好ましくは、電池
完成後に、内部電極体４０が電池ケース７２から圧縮応
力を受けるように設計されることが好ましい。Regardless of the mode of use of the insulating film 79, in order to suppress the radial movement of the internal electrode body 40, the outer periphery of the internal electrode body 40 and the battery can be inserted to the extent that it is not difficult to insert the internal electrode body 40. The clearance with the inner surface of the case 72 is preferably small, and more preferably, the internal electrode body 40 is preferably designed so as to receive a compressive stress from the battery case 72 after the battery is completed.

【００３２】 こうして、内部電極体４０を電池ケース
７２に挿入した状態において、内部電極体４０の端面近
傍、蓋７１Ａ・７１Ｂとの間において、タブ５Ａ・５Ｂ
と巻芯４１の長さを考慮し、電池ケース７２に絞り加工
を行い、内周側に突出した突起部８１を形成する。この
突起部８１の形成は、蓋７１Ａ・７１Ｂの固定を容易な
らしめるとともに、内部電極体４０の長さ方向への移動
を抑制する補助的な役割を果たす。また、突起部８１の
形成位置は蓋７１Ａ・７１Ｂの固定位置を決める重要な
役割を果たす。Thus, in a state where the internal electrode body 40 is inserted into the battery case 72, the tabs 5A and 5B are provided near the end surface of the internal electrode body 40 and between the lids 71A and 71B.
In consideration of the length of the winding core 41, the battery case 72 is subjected to a drawing process to form the protrusion 81 protruding toward the inner peripheral side. The formation of the projecting portion 81 facilitates fixing of the lids 71A and 71B and also plays a supplementary role of suppressing the movement of the internal electrode body 40 in the longitudinal direction. Further, the formation position of the projection 81 plays an important role in determining the fixing position of the lids 71A and 71B.

【００３３】 形成した突起部８１を利用して、シール
材８２をそれぞれ蓋７１Ａ・７１Ｂと電池ケース７２と
の間に挟み込み、電池ケース７２端部をかしめ加工す
る。こうして電池ケース７２の両端が封止されるととも
に、巻芯４１が蓋７１Ａ・７１Ｂにより挟持されつつ、
電池ケース７２の内部に収容、固定される。このとき、
巻芯４１は、単に蓋７１Ａ・７１Ｂから受ける圧力にの
み依存して固定されてもよいが、蓋７１Ａ・７１Ｂに巻
芯４１の端部形状に相補する溝や突起等を形成してお
き、これらを用いて正確に位置決めを行いつつ、蓋７１
Ａ・７１Ｂに挟持され、固定されることが好ましい。Using the formed projection 81, the sealing material 82 is sandwiched between the lids 71 A and 71 B and the battery case 72, and the end of the battery case 72 is caulked. In this way, both ends of the battery case 72 are sealed, and the core 41 is sandwiched by the lids 71A and 71B,
It is housed and fixed inside the battery case 72 . At this time,
The winding core 41 may be fixed only depending on the pressure received from the lids 71A and 71B, but the lids 71A and 71B are formed with grooves or protrusions complementary to the end shape of the winding core 41, Using these, the lid 71 is accurately positioned.
It is preferable that the A-71B is sandwiched and fixed.

【００３４】 こうして、内部電極体４０は、巻芯４１
によりその軸方向の移動を抑制されることとなる。更
に、前述したように、突起部８１によっても補助的に内
部電極体４０はその長さ方向の移動を抑制される。こう
して、内部電極体４０の長さ方向と径方向の動きが抑制
されるために、従来のリチウム二次電池と比較して、耐
振動性が著しく向上する。In this way, the internal electrode body 40 has the winding core 41.
Therefore, the movement in the axial direction is suppressed. Furthermore, as described above, the protrusion 81 also suppresses the movement of the internal electrode body 40 in the lengthwise direction. Thus, since the movement of the internal electrode body 40 in the length direction and the radial direction is suppressed, the vibration resistance is remarkably improved as compared with the conventional lithium secondary battery.

【００３５】 なお、シール材８２としては、電解液に
対する耐蝕性に優れ、また、かしめ加工において電解液
の漏れを防止するシール性の良好な高分子材料、例え
ば、ポリエチレン、ポリプロピレン、エチレンプロピレ
ンエラストマ、スチレン系エラストマ、オレフィン系エ
ラストマ、エチレンプロピレンゴム、ブチルゴム、スチ
レンブタジエンゴム、フッ素ゴムが好適に用いられる。As the sealing material 82, a polymer material excellent in corrosion resistance to an electrolytic solution and having a good sealing property for preventing leakage of the electrolytic solution during caulking, such as polyethylene, polypropylene, ethylene propylene elastomer, Styrenic elastomers, olefinic elastomers, ethylene propylene rubber, butyl rubber, styrene butadiene rubber, and fluororubber are preferably used.

【００３６】 こうして、内部電極体４０の固定が強固
に行われ、振動等による内部電極体４０自体の振動や移
動が抑制されることにより、電極活物質の剥離や内部電
極体４０自体の変形が抑制されると共に、従来、内部電
極体４０の振動等に起因してタブ５Ａ・５Ｂに掛かって
いた応力また低減され、電池の長寿命化が図られる。In this way, the internal electrode body 40 is firmly fixed, and the internal electrode body 40 itself is prevented from vibrating or moving due to vibration or the like, so that the electrode active material is peeled off or the internal electrode body 40 itself is deformed. In addition to being suppressed, the stress that has been conventionally applied to the tabs 5A and 5B due to the vibration of the internal electrode body 40 and the like is also reduced, and the battery life is extended.

【００３７】 さて、前述したように蓋７１Ａ・７１Ｂ
としては、金属材料が好適に用いられ、巻芯４１が蓋７
１Ａ・７１Ｂと接することから、巻芯４１として絶縁材
料、又はその表面を絶縁材料によって被覆された金属材
料からなるものが好適に用いられる。具体的には、絶縁
材料としては、ポリプロピレンやベークライト等の樹脂
やアルミナ等のセラミックが挙げられる。また、金属材
料としては、アルミニウムや銅、ステンレス等が挙げら
れ、その絶縁コーティングの方法としては、フッ素樹脂
等の固着や熱収縮フィルムによる被膜形成等の方法を挙
げることができる。なお、厳密には巻芯４１は少なくと
もその端面が絶縁材料からなるものであればよく、当然
に、正極板２と負極板３は巻芯４１と絶縁されるように
巻芯４１の外周に捲回される。Now, as described above, the lids 71A and 71B
A metal material is preferably used as the
Since it is in contact with 1A and 71B, an insulating material as the winding core 41 , or a metal material whose surface is covered with an insulating material
Those composed of charge is suitably used. Specifically, examples of the insulating material include resins such as polypropylene and bakelite, and ceramics such as alumina. Further, examples of the metal material include aluminum, copper, stainless steel, and the like, and examples of the method of insulating coating thereof include a method of fixing a fluororesin or the like and forming a film with a heat-shrinkable film. Strictly speaking, at least the end surface of the winding core 41 may be made of an insulating material. Naturally, the positive electrode plate 2 and the negative electrode plate 3 are wound around the outer circumference of the winding core 41 so as to be insulated from the winding core 41. To be turned.

【００３８】 さて、次に、電池５０における非水電解
液（以下、「電解液」という。）の充填方法について説
明する。１つの方法は、電池ケース７２の一方のみを封
止した状態において、他方の開口部を上側として減圧雰
囲気下に載置し、内部電極体４０へ電解液を注入して、
所定量の電解液が十分に内部電極体４０に含浸された後
に、不活性ガス雰囲気下として不要な電解液を排出し、
最後に開口部を封止する方法である。Next, a method of filling the non-aqueous electrolyte solution (hereinafter referred to as “electrolyte solution”) in the battery 50 will be described. One method is to place only one of the battery cases 72 in a sealed state, place the other opening in the decompressed atmosphere with the other opening facing upward, and inject the electrolytic solution into the internal electrode body 40.
After the internal electrode body 40 is sufficiently impregnated with a predetermined amount of electrolytic solution, the unnecessary electrolytic solution is discharged under an inert gas atmosphere,
Finally, it is a method of sealing the opening.

【００３９】 しかしながら、この方法では、内部電極
体４０への電解液の含浸に時間がかかり、また、開口部
を封止するまでの間、電池内部を不活性ガス雰囲気に保
つように配慮する必要がある等、作業性に問題がある。
ここで、巻芯４１の中空部を利用して電解液を封止され
た電池端部（下部）から含浸させることで、含浸時間を
短縮することは可能であるが、電池内部の雰囲気維持に
ついての問題は同様に残存する。However, in this method, it takes time to impregnate the internal electrode body 40 with the electrolytic solution, and it is necessary to take care to keep the inside of the battery in an inert gas atmosphere until the opening is sealed. There is a problem in workability.
Here, it is possible to shorten the impregnation time by impregnating the electrolyte solution from the sealed battery end (lower part) using the hollow part of the winding core 41, but to maintain the atmosphere inside the battery The problem of remains the same.

【００４０】 そこで、巻芯４１として中空円筒形状を
有するものを用い、電池ケース７２の両端部を封止する
際に、巻芯４１の中空部の外延上において、蓋７１Ａ・
７１Ｂのいずれか一方（図２においては、蓋７１Ａ）に
電解液注入口７７が位置するように構成することによっ
て、電池ケース７２の封止後に巻芯４１の中空部を利用
して電解液の充填を容易かつ迅速に行うことが可能とな
る。また、電解液の漏洩や気密性の低下につながる電解
液注入口を１箇所のみの配設に止めることができ、信頼
性の向上を図ることができる。[0040] Therefore, using the one having a hollow cylindrical shape as a winding core 41, when <br/> sealing the both ends of the battery case 72, on the extension of the hollow portion of the core 41, the lid 71A ·
(In FIG. 2, the lid 71A) either one of 71B due to the electrolyte injection hole 77 is configured to be positioned
Te, it is possible to perform the filling of the hollow portion electrolyte using a winding core 41 after sealing of the battery case 72 easily and quickly
It Further, the electrolyte solution inlet that leads to leakage of the electrolyte solution and deterioration of airtightness can be stopped at only one location, and reliability can be improved.

【００４１】 この場合、巻芯４１の中空部から電解液
が巻芯４１の外部へ流れ出るように、また電解液の注入
による脱ガスが容易となるようにする必要がある。図３
は巻芯４１の好適な実施の形態を示す斜視図であるが、
巻芯４１の端部に孔部４２又はスリット４３等を設けて
いる。In this case, it is necessary to allow the electrolytic solution to flow out from the hollow portion of the winding core 41 to the outside of the winding core 41 and to facilitate degassing by injecting the electrolytic solution. Figure 3
FIG. 3 is a perspective view showing a preferred embodiment of the winding core 41,
Provided holes 42 or slits 43 and the like on the end portion of the core 41
There is .

【００４２】 こうして、内部に巻芯４１を収容して両
端が封止された電池ケース７２を減圧雰囲気に載置し、
電解液注入口７７を通して、電解液注入用ノズルの先端
を対向する端面（電池５０の下部）付近まで挿入して、
所定量の電解液を注入して含浸処理を十分に行う。そし
て不活性雰囲気とした後、電解液注入用ノズルを排出用
ノズルとして用いて電池５０の下部や巻芯４１の中空部
に残留する不要な電解液を排出する。最後に、不活性雰
囲気において、電解液注入口をネジ等を用いて封止する
ことで、電池５０の組立が終了する。In this way, the battery case 72 having the core 41 housed therein and having both ends sealed is placed in a reduced pressure atmosphere,
Through the electrolyte injection port 77, insert the tip of the electrolyte injection nozzle into the vicinity of the opposite end face (lower part of the battery 50),
Sufficient impregnation is performed by injecting a predetermined amount of electrolytic solution. Then, after the atmosphere is made inert, the unnecessary electrolyte remaining in the lower portion of the battery 50 or the hollow portion of the winding core 41 is discharged by using the electrolyte injection nozzle as a discharge nozzle. Finally, the assembly of the battery 50 is completed by sealing the electrolyte injection port with a screw or the like in an inert atmosphere.

【００４３】 なお、電解液としては、エチレンカーボ
ネート（ＥＣ）、ジエチルカーボネート（ＤＥＣ）、ジ
メチルカーボネート（ＤＭＣ）といった炭酸エステル系
のもの、プロピレンカーボネート（ＰＣ）やγ−ブチロ
ラクトン、テトラヒドロフラン、アセトニトリル等の有
機溶媒の単独溶媒又は混合溶媒に、電解質としてのＬｉ
ＰＦ6やＬｉＢＦ4等のリチウム錯体フッ素化合物、ある
いはＬｉＣｌＯ4といったリチウムハロゲン化物等を１
種類又は２種類以上を溶解した非水電解液が好適に用い
られる。また、電解液の注入量は、片端のみ封止した電
池を用いて、その水位を観察しつつ予め実験的に求めて
おけばよい。また、外部端子７３Ａ・７３Ｂ間の抵抗を
測定しつつ、含浸処理を行えば、抵抗値が所定の値まで
低下した時点で含浸処理の終了を判断することができ
る。As the electrolytic solution, a carbonate-based one such as ethylene carbonate (EC), diethyl carbonate (DEC) and dimethyl carbonate (DMC), an organic solvent such as propylene carbonate (PC), γ-butyrolactone, tetrahydrofuran and acetonitrile. Li as an electrolyte in a single solvent or a mixed solvent of solvents
A lithium complex fluorine compound such as PF 6 or LiBF 4 , or a lithium halide such as LiClO 4 is used.
A non-aqueous electrolyte solution in which one kind or two or more kinds are dissolved is preferably used. Further, the injection amount of the electrolytic solution may be experimentally obtained in advance while observing the water level using a battery whose one end is sealed. Further, if the impregnation process is performed while measuring the resistance between the external terminals 73A and 73B, it is possible to determine the end of the impregnation process when the resistance value decreases to a predetermined value.

【００４４】 さて、一般的に、リチウム二次電池に
は、過充電や過放電時によって電池温度が上昇した場
合、電解液が蒸発して電池内圧が上昇し、電池が破裂す
る事故を防ぐための安全機構として、放圧弁が電池端部
に設けられるが、上述した電池５０の構造において、放
圧弁の配設には何ら悪影響が及ばないことはいうまでも
ない。例えば、図４は、電池５０の長さ方向からみた電
池５０の端面、即ち蓋７１Ａの平面図であるが、蓋７１
Ａの一部に孔部８５を設け、この孔部を閉塞するよう
に、金属箔８６を溶接等により取り付けると、金属箔８
６は、電池内圧が上昇した場合には、金属箔８６のみが
破裂することで、電池内圧が大気圧に開放される放圧弁
として機能する。Generally, in a lithium secondary battery, when the battery temperature rises due to overcharging or overdischarging, the electrolyte solution evaporates and the internal pressure of the battery rises to prevent the battery from bursting. As a safety mechanism, the pressure relief valve is provided at the end of the battery, but it goes without saying that the structure of the battery 50 described above has no adverse effect on the disposition of the pressure relief valve. For example, FIG. 4 is a plan view of the end surface of the battery 50, that is, the lid 71 </ b> A as viewed in the length direction of the battery 50.
A hole 85 is provided in a part of A, and the metal foil 86 is attached by welding or the like so as to close the hole.
6 functions as a pressure release valve that releases the battery internal pressure to the atmospheric pressure by rupturing only the metal foil 86 when the battery internal pressure rises.

【００４５】 次に、本発明に係るリチウム二次電池の
別の実施の形態を示す断面図を図６に示す。図６記載の
電池６０においては、内部電極体として、図５に示した
従来型の内部電極体１、即ち、巻芯６の長さが正極板２
等とほぼ同等であって巻芯６が極端に突出していないも
のを用い、巻芯６の両端に巻芯６の長さを延長する絶縁
部材７が配置されている。そして、巻芯６及び絶縁部材
７が電池ケース７２の端面を封止する蓋７１Ａ・７１Ｂ
により挟持され、電池ケース７２の内部に固定された構
造となっている。Next, FIG. 6 shows a sectional view showing another embodiment of the lithium secondary battery according to the present invention. In the battery 60 shown in FIG. 6, as the internal electrode body, the conventional internal electrode body 1 shown in FIG. 5, that is, the length of the winding core 6 is the positive electrode plate 2.
And the like, and the winding core 6 does not project extremely, and the insulating members 7 that extend the length of the winding core 6 are arranged at both ends of the winding core 6. Then, the winding core 6 and the insulating member 7 seal lids 71A and 71B for sealing the end surface of the battery case 72.
It is sandwiched by and is fixed inside the battery case 72 .

【００４６】 ここで、巻芯６の両端への絶縁部材７の
配置の方法としては、図６に示されるように、絶縁部材
７に肉厚を変えることで外径の異なる部分を設け、外径
の短い部分を巻芯６の中空部へ嵌挿する方法や、図７に
示すように、巻芯６の端部に凹凸部８を設け、この凹凸
部８に噛み合う端部形状を有する絶縁部材７を用いる方
法等が挙げられる。Here, as a method of arranging the insulating members 7 on both ends of the winding core 6, as shown in FIG. 6, a portion having a different outer diameter is provided by changing the thickness of the insulating member 7, A method of inserting a portion having a short diameter into the hollow portion of the winding core 6 or an insulating member having an uneven portion 8 provided at an end portion of the winding core 6 as shown in FIG. A method of using the member 7 may be used.

【００４７】 なお、巻芯６としは、電池構造を維持す
るための機械的強度と、耐電解液腐食性を有するもので
あれば、金属、樹脂、セラミック等の種々の材料を用い
ることが可能である。また、絶縁部材７としては、ポリ
プロピレンやベークライト等の絶縁性樹脂やアルミナ等
のセラミックを用いることが好ましい。As the core 6, various materials such as metal, resin, and ceramic can be used as long as they have mechanical strength for maintaining the battery structure and electrolytic solution corrosion resistance. Is. Further, as the insulating member 7, it is preferable to use an insulating resin such as polypropylene or bakelite or a ceramic such as alumina.

【００４８】 こうして、絶縁部材７により巻芯６が延
長された内部電極体１を用いることにより、前述した電
池５０の場合と同様の作製方法を用いて、電池６０を作
製することができる。ここで、巻芯６及び絶縁部材７が
図６に示されるような中空円筒形状で、一方の蓋、例え
ば、蓋７１Ａにおける巻芯６と絶縁部材７の中空部の外
延上の位置に電解液注入口７７を設けることで、前述し
た電池５０における電池封止後の電解液充填方法を用い
ることが可能となる。この場合、図３に示した孔部４２
又はスリット４３と同様の孔部やスリットを、図７に示
すように絶縁部材７に、特に絶縁部材７の蓋７１Ａ・７
１Ｂと接触する端部側に、設けている。Thus, by using the internal electrode body 1 in which the winding core 6 is extended by the insulating member 7, the battery 60 can be manufactured by the same manufacturing method as that of the battery 50 described above. Here, in a hollow cylindrical shape as the winding core 6 and the insulating member 7 is shown in FIG. 6, one of the lid, for example, electrolyte extensional on position of the hollow portion of the core 6 and the insulating member 7 in the lid 71A By providing the injection port 77, it is possible to use the above-described method of filling the battery 50 with the electrolytic solution after the battery is sealed. In this case, the hole 42 shown in FIG.
Alternatively, a hole or slit similar to the slit 43 may be formed in the insulating member 7 as shown in FIG.
It is provided on the end side that contacts 1B.

【００４９】 以上、本発明のリチウム二次電池の実施
の形態について説明してきたが、本発明が上記実施の形
態に限定されるものでないことはいうまでもない。本発
明のリチウム二次電池は、電池構造が簡単であるために
製造が容易であり、更に部品点数が少ないので軽量化を
図ることも可能となる。従って、本発明のリチウム二次
電池の有する耐振動性に優れるという特徴、並びに軽量
性を活かして、本発明のリチウム二次電池は、ＥＶ又は
ＨＥＶ等のモータ駆動用電源として好適に用いることが
できる。なお、電池容量は、このような用途や上述した
電池の組立方法、電池構造等を考慮し、２Ａｈ以上が好
適とされる。Although the embodiment of the lithium secondary battery of the present invention has been described above, it goes without saying that the present invention is not limited to the above embodiment. The lithium secondary battery of the present invention is easy to manufacture due to the simple battery structure, and further, it is possible to reduce the weight because the number of parts is small. Therefore, the lithium secondary battery of the present invention is suitable for use as a power source for driving a motor such as EV or HEV, taking advantage of the excellent vibration resistance and lightness of the lithium secondary battery of the present invention. it can. The battery capacity is preferably 2 Ah or more in consideration of such applications, the battery assembling method described above, the battery structure, and the like.

【００５０】[0050]

【発明の効果】 上述の通り、本発明のリチウム二次電
池においては、内部電極体が長さ方向においては巻芯に
より固定され、かつ径方向においては電池ケースにより
固定されているので、振動による内部電極体の移動や変
形が起こり難く、優れた耐振動特性が得られるととも
に、巻芯の中空部分を電解液の充填（注入）、排出時に
おける電解液の流路として積極的に利用することにより
非水電解液の充填（注入）、排出を容易かつ迅速に行う
ことが可能となる。また、電池構造が簡単であるために
組立が容易であり、しかも軽量化が図られる。これによ
り、本発明のリチウム二次電池は、信頼性と耐久性の向
上並びに生産性の向上という顕著な効果を奏する。この
効果は、ＥＶ等のモータ駆動用電源等の振動環境下で用
いられる場合に、特に顕著に得ることができる。As described above, in the lithium secondary battery of the present invention, the internal electrode body is fixed by the winding core in the lengthwise direction and is fixed by the battery case in the radial direction. difficult to occur the movement and deformation of the internal electrode body, the excellent vibration resistance is obtained together
At the time of filling (injecting) and discharging the hollow core core,
By positively using it as the electrolyte flow path in
Filling (injecting) and discharging non-aqueous electrolyte easily and quickly
It becomes possible. Further, since the battery structure is simple, it is easy to assemble and the weight is reduced. As a result, the lithium secondary battery of the present invention has remarkable effects of improving reliability and durability and improving productivity. This effect can be particularly remarkably obtained when used in a vibrating environment such as a motor driving power source such as an EV.

【図面の簡単な説明】[Brief description of drawings]

【図１】 本発明に好適に用いられる捲回型内部電極体
の構造を示す斜視図である。FIG. 1 is a perspective view showing the structure of a wound internal electrode body preferably used in the present invention.

【図２】 本発明のリチウム二次電池に好適に採用され
る電池構造の一実施形態を示す断面図である。FIG. 2 is a cross-sectional view showing an embodiment of a battery structure that is preferably adopted in the lithium secondary battery of the present invention.

【図３】 本発明のリチウム二次電池の内部電極体に好
適に用いられる巻芯の一形態を示す斜視図である。FIG. 3 is a perspective view showing one form of a winding core that is preferably used for the internal electrode body of the lithium secondary battery of the present invention.

【図４】 本発明のリチウム二次電池の端面に好適に配
設される放圧弁の一形態を示す平面図である。FIG. 4 is a plan view showing one form of a pressure release valve that is preferably arranged on the end surface of the lithium secondary battery of the present invention.

【図５】 従来の捲回型内部電極体の一般的な構造を示
す斜視図である。FIG. 5 is a perspective view showing a general structure of a conventional wound type internal electrode body.

【図６】 本発明のリチウム二次電池に好適に採用され
る電池構造の別の実施形態を示す断面図である。FIG. 6 is a cross-sectional view showing another embodiment of a battery structure suitably adopted for the lithium secondary battery of the present invention.

【図７】 本発明のリチウム二次電池における巻芯の延
長方法の一実施形態を示す斜視図である。FIG. 7 is a perspective view showing an embodiment of a winding core extension method in the lithium secondary battery of the present invention.

【図８】 従来のリチウム二次電池の端部構造の一例を
示す断面図である。FIG. 8 is a cross-sectional view showing an example of an end structure of a conventional lithium secondary battery.

【符号の説明】[Explanation of symbols]

１…内部電極体、２…正極板、３…負極板、４…セパレ
ータ、５Ａ・５Ｂ…タブ、６…巻芯、７…絶縁部材、８
…凹凸部、１０…電池、１１…電極リード、１２…ナッ
ト、１３…キャップ、１５…絶縁体カラー、１７…電池
ケース、１９…放圧弁、２０…極柱、３１…巻芯、３２
…電解液注入口、３５…電極渦巻体、４０…内部電極
体、４１…巻芯、４２…孔部、４３…スリット、５０…
リチウム二次電池（電池）、６０…電池、７１Ａ・７１
Ｂ…蓋、７２…電池ケース、７３Ａ・７３Ｂ…外部端
子、７４Ａ・７４Ｂ…内部端子、７７…電解液注入口、
７９…絶縁フィルム、８１…突起部、８２…シール材、
８５…孔部、８６…金属箔。DESCRIPTION OF SYMBOLS 1 ... Internal electrode body, 2 ... Positive electrode plate, 3 ... Negative electrode plate, 4 ... Separator, 5A / 5B ... Tab, 6 ... Core, 7 ... Insulating member, 8
... concavo-convex portion, 10 ... battery, 11 ... electrode lead, 12 ... nut, 13 ... cap, 15 ... insulator collar, 17 ... battery case, 19 ... pressure relief valve, 20 ... pole column, 31 ... core, 32
... Electrolyte injection port, 35 ... Electrode spiral body, 40 ... Internal electrode body, 41 ... Core, 42 ... Hole portion, 43 ... Slit, 50 ...
Lithium secondary battery (battery), 60 ... Battery, 71A / 71
B ... Lid, 72 ... Battery case, 73A / 73B ... External terminal, 74A / 74B ... Internal terminal, 77 ... Electrolyte injection port,
79 ... Insulating film, 81 ... Protrusion, 82 ... Sealing material,
85 ... Hole, 86 ... Metal foil.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−333599（ＪＰ，Ａ) 特開 平８−250084（ＪＰ，Ａ) 特開 平10−125347（ＪＰ，Ａ) 特開 平10−144339（ＪＰ，Ａ) 特開 平７−14609（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 10/36 - 10/40 H01M 10/04 H01M 2/04 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-333599 (JP, A) JP-A-8-250084 (JP, A) JP-A-10-125347 (JP, A) JP-A-10- 144339 (JP, A) JP, 7-14609 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01M 10/36-10/40 H01M 10/04 H01M 2/04

Claims (8)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 正極板と負極板とをセパレータを介して
巻芯外周に捲回してなる内部電極体を筒状の電池ケース
に収容し、非水電解液を用いてなるリチウム二次電池で
あって、 当該巻芯が、その端部に孔部又はスリットを備えた中空
円筒形状を有するとともに、当該電池ケースの端面を封
止する蓋により挟持され、当該電池ケースの内部に収
容、固定されてなり、かつ、 当該巻芯の中空部の外延上において、当該蓋の一方に、
当該巻芯の中空部及び当該孔部又はスリットを流路とし
て、当該非水電解液を注入、排出するための非水電解液
注入口が設けられてなる ことを特徴とするリチウム二次
電池。1. A lithium secondary battery in which a non-aqueous electrolyte is used in which an internal electrode body formed by winding a positive electrode plate and a negative electrode plate around a winding core with a separator interposed therebetween is housed in a cylindrical battery case. And the core is hollow with a hole or slit at its end.
It has a cylindrical shape and seals the end surface of the battery case.
It is clamped by the lid that holds it and is stored inside the battery case.
Volume, fixed, and on the outer extension of the hollow part of the winding core, on one of the lids,
The hollow part of the core and the hole or slit are used as the flow path.
Non-aqueous electrolyte for injecting and discharging the non-aqueous electrolyte
A lithium secondary battery, which is provided with an inlet . 【請求項２】 当該巻芯が、絶縁材料、又はその表面を
当該絶縁材料によって被覆された金属材料からなること
を特徴とする請求項１記載のリチウム二次電池。2. The winding core comprises an insulating material or a surface thereof.
The lithium secondary battery according to claim 1, wherein the lithium secondary battery is made of a metal material coated with the insulating material . 【請求項３】 正極板と負極板とをセパレータを介して
巻芯外周に捲回してなる内部電極体を筒状の電池ケース
に収容し、非水電解液を用いてなるリチウム二次電池で
あって、 当該巻芯の両端に当該巻芯の長さを延長する絶縁部材が
配置されてなり、 当該巻芯及び当該絶縁部材が中空円筒形状を有し、また
当該絶縁部材がその端部に孔部又はスリットを備えてな
るとともに、当該巻芯及び当該絶縁部材が当該電池ケー
スの端面を封止する蓋により挟持され、当該電池ケース
の内部に収容、固定されてなり、かつ、 当該巻芯及び当該絶縁部材の中空部の外延上において、
当該蓋の一方に、当該巻芯及び当該絶縁部材の中空部並
びに当該絶縁部材の孔部又はスリットを流路として、当
該非水電解液を注入、排出するための非水電解液注入口
が設けられてなる ことを特徴とするリチウム二次電池。3. A lithium secondary battery comprising a non-aqueous electrolytic solution in which an internal electrode body formed by winding a positive electrode plate and a negative electrode plate around a winding core via a separator is housed in a cylindrical battery case. there are, insulating member extending the length of the core at both ends of the winding core will be is arranged, the winding core and the insulating member has a hollow cylindrical shape,
The insulating member shall have holes or slits at its end.
In addition, the winding core and the insulating member are
The battery case is sandwiched by the lid that seals the end surface of the battery
Is housed and fixed inside, and on the outer extension of the hollow portion of the winding core and the insulating member,
On one side of the lid, the hollow core of the winding core and the insulating member is aligned.
And the hole or slit of the insulating member as a flow path.
Non-aqueous electrolyte injection port for injecting and discharging the non-aqueous electrolyte
A lithium secondary battery characterized by being provided with . 【請求項４】 当該電池ケースが、内部電極体の端面と
当該蓋との間において、当該電池ケースの内周側に突出
した突起部を備えてなることを特徴とする請求項１〜３
のいずれか一項に記載のリチウム二次電池。4. The battery case projects between the end surface of the internal electrode body and the lid toward the inner peripheral side of the battery case.
Claim 1-3, characterized in that it comprises an the protrusion
The lithium secondary battery according to any one of 1. 【請求項５】 当該蓋が、かしめにより当該電池ケース
に固定されてなることを特徴とする請求項１〜４のいず
れか一項に記載のリチウム二次電池。5. The battery case , wherein the lid is caulked.
The lithium secondary battery according to any one of claims 1 to 4, is fixed, characterized in Rukoto such in the. 【請求項６】 当該正極板及び当該負極板にそれぞれ取
り付けられた集電用のタブを１カ所に纏めて接続する集
合接続部を有する内部端子が、当該集合接続部が当該巻
芯の外周から当該内部電極体の外周に至る領域を当該巻
芯の軸方向に外延した範囲に位置するようにして、少な
くとも１つ当該蓋に取り付けられていることを特徴とす
る請求項１〜５のいずれか一項に記載のリチウム二次電
池。6. An internal terminal having a collective connecting part for collectively collecting and connecting the current collecting tabs attached to the positive electrode plate and the negative electrode plate at one location, wherein the collective connecting part is provided from the outer periphery of the core. the region extending to the outer periphery of the internal electrode body so as to be positioned in the range that is extension in the axial direction of the winding core, claim 1-5, characterized in that attached to at least one said lid The lithium secondary battery according to item 1. 【請求項７】 電気自動車又はハイブリッド電気自動車
のモータ駆動用電源として用いられることを特徴とする
請求項１〜６のいずれか一項に記載のリチウム二次電
池。7. A lithium secondary battery according to any one of claims 1 to 6, characterized in that used as a power source for driving a motor of an electric vehicle or hybrid electric vehicle. 【請求項８】 ２Ａｈ以上の電池容量を有することを特
徴とする請求項１〜７のいずれか一項に記載のリチウム
二次電池。8. A lithium secondary battery according to any one of claims 1 to 7, characterized in that it has a battery capacity of more than 2Ah.
JP33429198A 1998-10-13 1998-11-25 Lithium secondary battery Expired - Fee Related JP3470051B2 (en)

Priority Applications (7)

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JP33429198A JP3470051B2 (en) 1998-11-25 1998-11-25 Lithium secondary battery
US09/415,164 US6387561B1 (en) 1998-10-13 1999-10-08 Electrolyte-solution filling method and battery structure of lithium secondary battery
CA002285764A CA2285764C (en) 1998-10-13 1999-10-12 Electrolyte solution filling method and battery structure of lithium secondary battery
EP99120325A EP0994519A3 (en) 1998-10-13 1999-10-12 Electrolyte solution filling method and battery structure of lithium secondary battery
CA002447501A CA2447501C (en) 1998-10-13 1999-10-12 Structure of a lithium secondary battery
US10/106,748 US6858342B2 (en) 1998-10-13 2002-03-26 Electrolyte solution filling method and battery structure of lithium secondary battery
US10/106,768 US20020106553A1 (en) 1998-10-13 2002-03-26 Electrolyte solution filling method and battery structure of lithium secondary battery

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JP33429198A JP3470051B2 (en) 1998-11-25 1998-11-25 Lithium secondary battery

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JP4802365B2 (en) * 2000-12-20 2011-10-26 日産自動車株式会社 battery
KR100646536B1 (en) * 2005-03-24 2006-11-23 삼성에스디아이 주식회사 Cylindrical Li Secondary Battery
KR100846071B1 (en) 2006-07-18 2008-07-14 주식회사 엘지화학 Electrode Assembly Having Noble Lead-Tap Joint and Electrochemical Cell Containing the Same
JP5098285B2 (en) * 2006-10-18 2012-12-12 パナソニック株式会社 Non-aqueous electrolyte secondary battery and manufacturing method thereof
JP5091507B2 (en) * 2007-03-08 2012-12-05 日立ビークルエナジー株式会社 Winding battery
FR2936653B1 (en) * 2008-09-30 2011-02-11 Commissariat Energie Atomique LIQUID ELECTROLYTE ACCUMULATOR AND FILLING METHOD
US8574749B2 (en) 2009-10-14 2013-11-05 Samsung Sdi Co., Ltd. Lithium secondary battery
JP5437133B2 (en) * 2010-03-31 2014-03-12 古河電池株式会社 Lithium ion battery and method for producing lithium ion battery
JP2012216653A (en) * 2011-03-31 2012-11-08 Shin Kobe Electric Mach Co Ltd Power storage device
JP5729562B2 (en) * 2011-12-26 2015-06-03 三菱自動車工業株式会社 battery
KR101549174B1 (en) * 2012-12-18 2015-09-01 주식회사 엘지화학 Secondary battery and method for manufacturing the same
CN110190205A (en) * 2019-05-15 2019-08-30 广东微电新能源有限公司 Non- crimping cylindrical battery
CN212085151U (en) 2020-05-15 2020-12-04 宁德时代新能源科技股份有限公司 Secondary battery, battery module, and device
CN113659187B (en) * 2021-07-22 2023-04-07 风帆有限责任公司 Storage battery and assembly process
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