JP2001057190A - Battery pack - Google Patents
Battery packInfo
- Publication number
- JP2001057190A JP2001057190A JP11231658A JP23165899A JP2001057190A JP 2001057190 A JP2001057190 A JP 2001057190A JP 11231658 A JP11231658 A JP 11231658A JP 23165899 A JP23165899 A JP 23165899A JP 2001057190 A JP2001057190 A JP 2001057190A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- battery
- pack
- case
- space
- 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.)
- Granted
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
Landscapes
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯電話機やモバ
イルコンピュータ等の携帯情報機器の電池電源として要
求される小型軽量化及び薄型化を達成する電池パックに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack which is required to be used as a battery power source for a portable information device such as a portable telephone or a mobile computer, and which is small, light and thin.
【０００２】[0002]
【従来の技術】携帯電話機やモバイルコンピュータ等の
携帯情報機器の体積及び重量中に電池が占める比率は少
なくなく、携帯情報機器の小型軽量化及び薄型化の鍵を
電池が握っているといっても過言ではない。この携帯情
報機器の小型軽量化及び薄型化の要求に応えるべく扁平
形状のリチウムイオン二次電池が用いられているが、更
なる軽量化、薄型化を可能とする二次電池としてリチウ
ムポリマー二次電池に期待が寄せられている。特に積層
極板群をラミネートシートによって形成した外装体内に
収容したものは、軽量化や薄型化の実現に効果的であ
る。2. Description of the Related Art The ratio of a battery to the volume and weight of a portable information device such as a cellular phone or a mobile computer is not small, and it is said that the battery holds the key to reducing the size, weight and thickness of the portable information device. Not too much. A flat-shaped lithium ion secondary battery has been used to meet the demand for smaller and lighter portable information devices, but a lithium polymer secondary battery has been used as a secondary battery that can be further reduced in weight and thickness. Expectations have been placed on batteries. In particular, the one in which the laminated electrode plate group is accommodated in an exterior body formed of a laminated sheet is effective in realizing a reduction in weight and thickness.
【０００３】このようなリチウム系二次電池のようにエ
ネルギー密度の高い二次電池では、過充電、過放電、過
大放電電流等による劣化や破損を防止するため、保護回
路やＰＴＣ等を用いて構成した電池保護装置を用いるこ
とが不可欠で、二次電池と共にパックケース内に収容し
て電池パックの形態に構成される。A secondary battery having a high energy density, such as a lithium secondary battery, uses a protection circuit, a PTC, or the like to prevent deterioration or damage due to overcharge, overdischarge, excessive discharge current, or the like. It is indispensable to use the configured battery protection device, and the battery protection device is housed in a pack case together with the secondary battery to be configured in the form of a battery pack.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、二次電
池は充放電の繰り返しや経年変化による極板の膨張が生
じ、過放電や満充電状態での高温放置が継続されると電
解液の分解によりガスが発生し、外装体に膨らみが生じ
ることになる。この二次電池をパックケースに収容する
と、二次電池の膨らみがパックケースに及び、パックケ
ースの外形寸法に変化が生じることになる。携帯電話機
のように小型の携帯機器では、電池パックは僅かな間隙
を隔てて機器の構成要素と対面しているので、パックケ
ースの外形寸法の変化が機器に影響を与えることにな
る。特に、ラミネートシートのように軟質の素材によっ
て外装体を形成した二次電池では、極板の膨張やガスの
発生は、直ちに外装体に膨らみを発生させ、それはパッ
クケースの膨らみとなって外形寸法に変化を与える。However, in a secondary battery, the electrode plate expands due to repeated charge / discharge or aging, and when the battery is left at high temperature in an overdischarged or fully charged state, the electrolyte is decomposed. Gas is generated, and the exterior body swells. When the secondary battery is accommodated in the pack case, the swelling of the secondary battery extends to the pack case, and the external dimensions of the pack case change. In a small portable device such as a mobile phone, the battery pack faces a component of the device with a slight gap, so that a change in the outer dimensions of the pack case affects the device. In particular, in a secondary battery in which an outer package is formed from a soft material such as a laminate sheet, the expansion of the electrode plate and the generation of gas immediately cause the outer package to swell, which becomes the swell of the pack case. Change.
【０００５】また、ラミネートシートのような軟質の外
装体に積層された極板群を収容した構造では、外装体が
積層された各極板を所定位置に拘束する拘束力が弱いた
め、衝撃や振動が加わったときに極板の位置ずれが生じ
やすく、内部短絡やリード破断等の損傷を生じやすい問
題点があった。Further, in a structure in which a group of electrode plates laminated on a soft outer package such as a laminate sheet is housed, the binding force for restricting each of the electrode plates with the outer package laminated at a predetermined position is weak, so that an impact or When vibration is applied, there is a problem in that the electrode plate is easily displaced, and easily damaged such as an internal short circuit or a broken lead.
【０００６】本発明が目的とするところは、ラミネート
シートを外装体とした二次電池を用いた電池パックにお
ける二次電池の極板の膨張を抑制すると同時にガスによ
る外装体の膨らみの影響を抑制し、積層極板群の外装体
内での移動を防止する構造を備えた電池パックを提供す
ることにある。An object of the present invention is to suppress the expansion of an electrode plate of a secondary battery in a battery pack using a secondary battery having a laminate sheet as an exterior body, and at the same time, the effect of swelling of the exterior body due to gas. It is another object of the present invention to provide a battery pack having a structure for preventing the stacked electrode plate group from moving inside the outer package.
【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
の本発明は、ラミネートシートで形成された外装材内に
複数の正負極板を積層した積層極板群を封入して矩形平
板形状に形成された二次電池をパックケース内に収容し
てなる電池パックにおいて、前記パックケース内に、前
記二次電池の収容位置を規制する位置規制部位と、二次
電池との間に空間を設けた空間形成部位とが形成されて
なることを特徴とする。SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a rectangular plate shape by enclosing a laminated electrode group in which a plurality of positive and negative electrode plates are laminated in an exterior material formed of a laminate sheet. In a battery pack including the formed secondary battery in a pack case, a space is provided between the secondary battery and a position regulating portion that regulates a storage position of the secondary battery in the pack case. And a space forming portion formed therein.
【０００８】上記構成によれば、パックケース内に形成
された位置規制部位は二次電池のパックケース内への収
容位置を規制してパックケース内に位置固定し、衝撃や
振動が加わったときに積層された極板の移動を防止する
と共に、平板面に当接する位置規制部位は極板の積層方
向に緊迫圧を加えて極板の膨張を抑制する。また、空間
形成部位は二次電池との間に空間を形成するので、ガス
発生により外装体に膨らみが生じたとき、ラミネートシ
ートで形成されて軟質な外装体の膨らみを空間形成部位
の空間に逃がし、外装体の膨らみがパックケースの外形
寸法に変化を生じさせないようにする。[0010] According to the above configuration, the position regulating portion formed in the pack case regulates the storage position of the secondary battery in the pack case and fixes the position in the pack case. In addition to preventing the movement of the electrode plates stacked on the flat plate, the position restricting portion that contacts the flat plate surface applies a compressive pressure in the stacking direction of the electrode plates to suppress the expansion of the electrode plates. In addition, since the space forming portion forms a space between the secondary battery and the secondary battery, when swelling occurs in the outer case due to gas generation, the swelling of the soft outer case formed of a laminate sheet is applied to the space of the space forming portion. Escape and prevent the bulge of the exterior body from causing a change in the external dimensions of the pack case.
【０００９】上記構成において、二次電池の平板面に臨
むパックケースの内面に、二次電池への位置規制部位と
空間形成部位とを適宜形成することにより、位置規制部
位は二次電池のパックケース内への収容位置を規制する
と共に緊迫圧を加えて極板の膨張を抑制し、空間形成部
位は外装体の膨らみを吸収することができる。In the above configuration, the position regulating portion and the space forming portion for the secondary battery are appropriately formed on the inner surface of the pack case facing the flat surface of the secondary battery. The accommodation position in the case is regulated, and a compressive pressure is applied to suppress the expansion of the electrode plate, and the space forming portion can absorb the expansion of the exterior body.
【００１０】また、二次電池の側面に臨むパックケース
の内面に、少なくとも二次電池の４隅を囲むように位置
規制部位を形成することにより、矩形形状の二次電池は
その４隅で位置規制部位によって位置規制され、衝撃や
振動が加わったときにも積層された極板の移動がなく、
極板の移動による内部短絡等が防止される。[0010] Further, by forming a position regulating portion on the inner surface of the pack case facing the side surface of the secondary battery so as to surround at least four corners of the secondary battery, the rectangular secondary battery is positioned at the four corners. The position is regulated by the regulating part, and even when shock or vibration is applied, there is no movement of the laminated electrode plates,
An internal short circuit or the like due to the movement of the electrode plate is prevented.
【００１１】[0011]
【発明の実施の形態】以下、添付図面を参照して本発明
の一実施形態について説明し、本発明の理解に供する。
尚、以下に示す実施形態は本発明を具体化した一例であ
って、本発明の技術的範囲を限定するものではない。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.
【００１２】本実施形態に係る電池パックは、携帯電話
機の電池電源として構成した例を示すもので、図１に示
すように、それぞれ半殻体に形成された上ケース２ａと
下ケース２ｂとからなるパックケース２内に、リチウム
ポリマー二次電池として構成された二次電池３と、この
二次電池３を過充電、過放電等から保護する電池保護装
置４とを収容して構成されている。The battery pack according to the present embodiment shows an example in which the battery pack is used as a battery power source of a portable telephone. As shown in FIG. 1, the battery pack is composed of an upper case 2a and a lower case 2b each formed in a half shell. In a pack case 2, a secondary battery 3 configured as a lithium polymer secondary battery and a battery protection device 4 for protecting the secondary battery 3 from overcharge, overdischarge, and the like are housed. .
【００１３】この電池パック１は、携帯電話機に着脱自
在に装填できるように構成されるもので、パックケース
２を構成する上ケース２ａは携帯電話機の外装ケースの
一部を構成する。従って、上ケース２ａは機器外装とし
ての強度と美観を呈するように形成される。この上ケー
ス２ａ及び下ケース２ｂは樹脂成形により形成され、二
次電池３及び電池保護装置４を収容して両ケース間は、
それぞれの周縁部で接合により一体化される。The battery pack 1 is configured to be removably mountable in a mobile phone, and an upper case 2a forming a pack case 2 forms a part of an outer case of the mobile phone. Therefore, the upper case 2a is formed so as to exhibit the strength and aesthetic appearance as a device exterior. The upper case 2a and the lower case 2b are formed by resin molding, accommodate the secondary battery 3 and the battery protection device 4, and
Each peripheral portion is integrated by joining.
【００１４】前記二次電池３は、図２に断面図として示
すように、シート状に形成された正極板と負極板とをポ
リマー電解質シートからなるセパレータを介して複数層
に積層して形成された積層極板群１０を、ラミネートシ
ートからなる柔軟な外装体１１内に収容して構成されて
いる。As shown in the sectional view of FIG. 2, the secondary battery 3 is formed by laminating a sheet-like positive electrode plate and a negative electrode plate into a plurality of layers via a separator made of a polymer electrolyte sheet. The laminated electrode group 10 is accommodated in a flexible exterior body 11 made of a laminated sheet.
【００１５】この外装体１１は、アルミニウム層の両側
に複数の樹脂層を形成したラミネートシートを用いて密
閉構造に形成される。図３に示すように、外装体１１を
形成するラミネートシート２０は、中央折り曲げ線Ｔで
２分した一方側に、前記積層極板群１０の外形寸法より
やや大きな矩形状で、積層極板群１０の厚さとほぼ同一
の深さを有する極板収容凹部３３が形成される。この極
板収容凹部３３に積層極板群１０を収容し、中央折り曲
げ線Ｔから２つ折りにすると共に、積層極板群１０の正
極板から正極リード１２、負極板から負極リード１３を
引き出し、電解液を注入して、周辺の３か所Ｐ１、Ｐ
２、Ｐ３を熱接合によりシールして前記極板収容凹部３
３を密閉し、図４（ａ）に示すような二次電池３に形成
する。両サイドのシール辺Ｐ２、Ｐ３は、図４（ｂ）に
示すように、内側に折り返して二次電池３の幅寸法の縮
小を図ると共に、シール性の向上を図っている。The exterior body 11 is formed in a closed structure using a laminate sheet having a plurality of resin layers formed on both sides of an aluminum layer. As shown in FIG. 3, the laminated sheet 20 forming the exterior body 11 has a rectangular shape slightly larger than the outer dimensions of the laminated electrode group 10 on one side divided by a center folding line T, and The electrode plate accommodating recess 33 having substantially the same depth as the thickness of the electrode plate 10 is formed. The stacked electrode plate group 10 is accommodated in the electrode plate accommodating recess 33 and folded in two from the center bending line T, and the positive electrode lead 12 is pulled out from the positive electrode plate and the negative electrode lead 13 is drawn out from the negative electrode plate of the stacked electrode plate group 10. Inject the liquid, and three places P1, P
2, P3 is sealed by thermal bonding, and
3 to form a secondary battery 3 as shown in FIG. As shown in FIG. 4 (b), the sealing sides P2 and P3 on both sides are turned inward to reduce the width of the secondary battery 3 and to improve the sealing performance.
【００１６】上記構成になる二次電池３は、図５に示す
ように、下ケース２ｂ内に電池保護装置４と共に収容さ
れる。下ケース２ｂには、矩形平板状に形成された二次
電池３の側面に臨む部位に、二次電池３の４隅のコーナ
ーをそれぞれ囲んで二次電池３の収容位置を規制する位
置規制部１４ａ、１４ｂ、１４ｃ、１４ｄ、１４ｅ、１
４ｆ（斜線表示）が形成されており、二次電池３の下ケ
ース２ｂへの収容位置を位置決めし、収容位置からの移
動を規制している。また、下ケース２ｂの二次電池３の
図示左右側面に臨む部位の前記位置規制部１４ａ、１４
ｂ、１４ｃ、１４ｄを除く部位は、二次電池３の左右側
面との間に所定距離の隔たりを形成した空間形成部１５
ａ、１５ｂが形成され、図示下側面に臨む部位の前記位
置規制部１４ｅ、１４ｆを除く部位は、二次電池３の下
側面との間に所定距離の隔たりを形成した空間形成部１
５ｃが形成されている。The secondary battery 3 having the above configuration is housed in the lower case 2b together with the battery protection device 4, as shown in FIG. In the lower case 2b, a position regulating portion that regulates a housing position of the secondary battery 3 by surrounding four corners of the secondary battery 3 at a portion facing the side surface of the secondary battery 3 formed in a rectangular flat plate shape. 14a, 14b, 14c, 14d, 14e, 1
4f (indicated by oblique lines) is formed, which positions the storage position of the secondary battery 3 in the lower case 2b and regulates movement from the storage position. Further, the position restricting portions 14a, 14 of the lower case 2b at portions facing the left and right side surfaces in the drawing of the secondary battery 3 are illustrated.
The portions excluding b, 14c and 14d are space forming portions 15 having a predetermined distance from the left and right side surfaces of the secondary battery 3.
a and 15b are formed, and the portion excluding the position regulating portions 14e and 14f facing the lower surface in the figure is a space forming portion 1 having a predetermined distance from the lower surface of the secondary battery 3.
5c is formed.
【００１７】図５に示す二次電池３及び電池保護装置４
を収容した下ケース２ｂに上ケース２ａを接合した状態
で、前記位置規制部１４ｃ、１４ｄの形成位置であるＡ
−Ａ線矢視断面を図６（ａ）に、前記空間形成部１５
ａ、１５ｂの形成位置であるＢ−Ｂ線矢視断面を図６
（ｂ）に示す。図６（ａ）に示すように、位置規制部１
４ｃ、１４ｄの形成位置では、二次電池３の側面（シー
ル辺Ｐ２、Ｐ３の折り返し部分）に近接して二次電池３
の幅方向の収容位置を規制している。一方、位置規制部
１４ａ、１４ｂ、１４ｃ、１４ｄが形成されていない空
間形成部１５ａ、１５ｂの形成位置では、図６（ｂ）に
示すように、二次電池３の側面との間に空間が形成され
ている。The secondary battery 3 and the battery protection device 4 shown in FIG.
In a state where the upper case 2a is joined to the lower case 2b that accommodates the
FIG. 6A is a sectional view taken along line A of FIG.
FIG. 6 is a cross-sectional view taken along the line BB, which is a formation position of a and 15b.
(B). As shown in FIG. 6A, the position regulating unit 1
In the formation positions of 4c and 14d, the secondary battery 3 is located close to the side surface of the secondary battery 3 (the folded portion of the sealing sides P2 and P3).
Is regulated in the width direction. On the other hand, at the formation positions of the space forming portions 15a and 15b where the position regulating portions 14a, 14b, 14c and 14d are not formed, as shown in FIG. Is formed.
【００１８】また、二次電池３及び電池保護装置４を収
容した下ケース２ｂに上ケース２ａを接合した状態で、
前記位置規制部１４ｂ、１４ｆの形成位置であるＣ−Ｃ
線矢視断面を図７（ａ）に、前記空間形成部１５ｃの形
成位置であるＤ−Ｄ線矢視断面を図７（ｂ）に示す。図
７（ａ）に示すように、位置規制部１４ｂ、１４ｆの形
成位置では、二次電池３の側面に近接して二次電池３の
幅方向の収容位置を規制している。一方、空間形成部１
５ｃの形成位置では、図７（ｂ）に示すように、二次電
池３の側面との間に空間が形成されている。Further, with the upper case 2a joined to the lower case 2b containing the secondary battery 3 and the battery protection device 4,
C-C which is a formation position of the position restricting portions 14b and 14f
FIG. 7A is a cross-sectional view taken along line D-D, and FIG. 7B is a cross-sectional view taken along line D-D of FIG. As shown in FIG. 7A, at the position where the position regulating portions 14 b and 14 f are formed, the accommodation position of the secondary battery 3 in the width direction is regulated close to the side surface of the secondary battery 3. On the other hand, the space forming unit 1
At the formation position of 5c, as shown in FIG. 7B, a space is formed between the secondary battery 3 and the side surface.
【００１９】この二次電池３の側面に対して位置規制部
１４ａ〜１４ｆ及び空間形成部１５ａ〜１５ｃが形成さ
れると同時に、二次電池３の平板面に対しても二次電池
３に当接して二次電池３に緊迫力を加える当接部（位置
規制部位）１６と、二次電池３との間に空間を形成する
間隙部（空間形成部位）１７とが形成される。即ち、図
６に示すように、上ケース２ａの中央部には、二次電池
３の平板面に当接するように肉厚にした当接部１６と、
その両側に二次電池３との間に間隙Ｇが形成されるよう
に肉薄にした間隙部１７とが形成されている。Position regulating portions 14a to 14f and space forming portions 15a to 15c are formed on the side surface of the secondary battery 3, and at the same time, the flat surface of the secondary battery 3 is also applied to the secondary battery 3. A contact portion (position regulating portion) 16 that contacts and applies a tension to the secondary battery 3 and a gap portion (space forming portion) 17 that forms a space between the secondary battery 3 and the contact portion are formed. That is, as shown in FIG. 6, a contact portion 16 having a large thickness so as to contact the flat surface of the secondary battery 3 is provided at the center of the upper case 2a.
A gap portion 17 is formed on both sides thereof so as to form a gap G between itself and the secondary battery 3.
【００２０】本構成になる二次電池３のように、軟質の
外装体１１内に複数の極板を積層した積層極板群１０を
収容した構造では、外装体１１の積層極板群１０を拘束
する力が弱く、衝撃や振動が加わったときに積層された
極板に位置ずれが生じやすくなるが、上記位置規制部１
４ａ、１４ｂは二次電池３のリード引き出し側の左右コ
ーナー部分を囲み、位置規制部１４ｃ、１４ｄ、１４
ｅ、１４ｆは二次電池の後端側の左右コーナー部分を囲
んでいるので、極板の移動が規制される。極板の移動
は、極板間の位置ずれによる内部短絡やリード断線、極
板の移動によって外装体１１のラミネートシートを傷つ
け、その内層のアルミニウム層に極板が接触することに
よる局部電池の発生等の弊害を生じさせる恐れがある
が、位置規制部１４ｃ、１４ｄ、１４ｅ、１４ｆによる
位置規制により、これらの弊害の発生が防止される。ま
た、上ケース２ａに形成された当接部１６によって極板
の積層方向に緊迫力が加わるので、積層された極板間の
摩擦力が大きくなり、極板は更に位置ずれし難い状態と
なる。また、当接部１６による緊迫力は、積層極板群１
０の充放電の繰り返しや経年変化による膨張を抑制する
効果もある。In a structure in which a laminated electrode group 10 in which a plurality of electrode plates are laminated in a soft exterior body 11 like the secondary battery 3 having this configuration is housed, the laminated electrode group 10 of the exterior body 11 is Although the restraining force is weak and the laminated electrode plates are likely to be displaced when an impact or vibration is applied, the position regulating portion 1
Reference numerals 4a and 14b enclose left and right corners of the rechargeable battery 3 on the lead lead-out side.
Since e and 14f surround the left and right corners on the rear end side of the secondary battery, the movement of the electrode plate is restricted. The movement of the electrode plate may cause an internal short circuit or lead disconnection due to displacement between the electrode plates, or damage to the laminate sheet of the exterior body 11 due to the movement of the electrode plate, and a local battery may be generated due to the electrode plate contacting the inner aluminum layer. However, the position regulation by the position regulation units 14c, 14d, 14e, and 14f prevents the occurrence of these problems. Further, since the contact portion 16 formed on the upper case 2a applies a tension force in the stacking direction of the electrode plates, the frictional force between the stacked electrode plates increases, and the electrode plates are more difficult to be displaced. . Further, the tension force caused by the contact portion 16 is the same as that of the laminated electrode group 1.
There is also an effect of suppressing expansion due to repetition of 0 charge / discharge and aging.
【００２１】また、二次電池は過充電や満充電状態で放
置されたような場合にガスが発生する。二次電池３のよ
うにラミネートシートを外装体１１とした場合には、外
装体が軟質であるため、ガスの発生は直ちに外装体１１
に膨らみを生じさせ、外装体１１の膨らみは電池パック
１に外形形状の変化を及ぼすことになる。このような電
池使用の誤りによるガス発生に対処するため、前記空間
形成部１５ａ〜１５ｃ及び間隙部１７が設けられてお
り、ガス発生による外装体１１の膨らみをパックケース
２内の空間に逃がすようにしている。外装体１１は軟質
であるため、位置規制部１４ａ〜１４ｆや当接部１６が
二次電池３に当接している以外の空間のある部分に膨ら
みを逃がすことができ、万が一のガス発生に対しても電
池パック１の変形が防止される。Also, when the secondary battery is left in an overcharged or fully charged state, gas is generated. When the laminate sheet is used as the outer package 11 as in the secondary battery 3, the gas is generated immediately because the outer package is soft.
Swelling, and the swelling of the exterior body 11 changes the outer shape of the battery pack 1. In order to cope with the gas generation due to such an erroneous use of the battery, the space forming portions 15a to 15c and the gap portion 17 are provided so that the swelling of the exterior body 11 due to the gas generation is released to the space in the pack case 2. I have to. Since the exterior body 11 is soft, the swelling can be released to a part of the space other than the position regulating parts 14a to 14f and the contact part 16 which are in contact with the secondary battery 3, so that in case of gas generation, However, deformation of the battery pack 1 is prevented.
【００２２】図８は、空間形成部１５ｂの形成位置の断
面を示し、図８（ａ）に示すように、ガス発生のない正
常状態では、二次電池３の側面と空間形成部１５ｂとの
間、及び二次電池３の平板面と間隙部１７との間には、
空間が形成されている。前述したような二次電池３の異
常使用により外装体１１内にガスが発生したとき、軟質
の外装体１１は、図８（ｂ）に示すように膨らみ、この
膨らみは空間形成部１５ｂと間隙部１７とによって形成
された空間に逃がすことができる。外装体１１は軟質で
あるため、位置規制部１４ａ〜１４ｆや当接部１６が外
装体１１に当接している以外の空間のある部分に膨らみ
を逃がすことができ、万が一のガス発生に対しても電池
パック１の変形が防止される。FIG. 8 shows a cross section of the formation position of the space forming portion 15b. As shown in FIG. 8 (a), in a normal state where no gas is generated, the side surface of the secondary battery 3 and the space forming portion 15b are connected. And between the flat surface of the secondary battery 3 and the gap 17,
A space is formed. When gas is generated in the exterior body 11 due to abnormal use of the secondary battery 3 as described above, the soft exterior body 11 swells as shown in FIG. It can escape into the space formed by the part 17. Since the exterior body 11 is soft, the swelling can be released to a part of the space other than the position regulating parts 14a to 14f and the contact part 16 which are in contact with the exterior body 11, so that in case of gas generation, Also, the deformation of the battery pack 1 is prevented.
【００２３】図９は、電池パック１を下ケース２ｂ側か
ら見た平面図で、二次電池３の平板面に対面する面は、
図６及び図７に示したように薄肉形成されて、二次電池
３の積層極板群１０が膨張によりその厚さが変化した場
合や、前述のガス発生により外装体１１が膨張した場合
に、弾性的に変形する弾性変形面１８が形成されてい
る。また、この弾性変形面１８を取り囲むように突出形
成された外周部１９が形成されている。更に、弾性変形
面１８は薄肉形成されているので、刃物等による突き刺
しにより二次電池３が損傷を受けることを防止するた
め、弾性変形面１８の周辺部分を除いた部分にステンレ
ス薄板（金属薄板）７が貼着されている。このステンレ
ス薄板７の角部には、外周部１９に当接する突出部７ａ
が形成され、ステンレス薄板７を弾性変形面１８に貼着
するときの位置決めができるように構成されている。FIG. 9 is a plan view of the battery pack 1 as viewed from the lower case 2b side.
As shown in FIGS. 6 and 7, when the laminated electrode group 10 of the secondary battery 3 changes its thickness due to expansion, or when the exterior body 11 expands due to the gas generation described above, , An elastically deformable surface 18 that is elastically deformed is formed. Further, an outer peripheral portion 19 is formed so as to protrude so as to surround the elastic deformation surface 18. Further, since the elastically deformable surface 18 is formed to be thin, a stainless steel plate (metal thin plate) is formed on a portion excluding the peripheral portion of the elastically deformable surface 18 in order to prevent the rechargeable battery 3 from being damaged by piercing with a blade or the like. 7) is affixed. At the corner of the stainless steel plate 7, a protruding portion 7 a contacting the outer peripheral portion 19 is provided.
Are formed so that positioning when the stainless steel thin plate 7 is adhered to the elastically deformable surface 18 can be performed.
【００２４】この構成により二次電池３は、前記弾性変
形面１８と上ケース２ａの当接部１６とに挟まれた状態
になり、弾性変形面１８により弾性加圧を受けて、その
厚さ方向に緊迫力が加わった状態にパックケース２内に
収容されるので、極板の膨張が抑制されると同時に、ガ
ス発生によるパックケース２の厚さ方向の外形変化を抑
制している。With this configuration, the secondary battery 3 is sandwiched between the elastically deformable surface 18 and the contact portion 16 of the upper case 2a, and is elastically pressed by the elastically deformable surface 18 so that its thickness is reduced. Since the accommodating member is housed in the pack case 2 in a state where a tension force is applied in the direction, the expansion of the electrode plate is suppressed, and at the same time, the outer shape change in the thickness direction of the pack case 2 due to gas generation is suppressed.
【００２５】図６及び図７に示すように、前記弾性変形
面１８は本構成においては厚さ０．２２ｍｍに薄肉形成
され、この弾性変形面１８の周囲には、所定高さに外周
部１９が形成されている。この外周部１９の頂部と弾性
変形面１８に貼着されたステンレス薄板７の表面との間
には段差Ｈができるように外周部１９の突出高さが形成
される。尚、本構成での段差Ｈは０．４ｍｍに設定され
ている。As shown in FIGS. 6 and 7, in the present construction, the elastic deformation surface 18 is formed to be thin with a thickness of 0.22 mm. Are formed. A protruding height of the outer peripheral portion 19 is formed between the top of the outer peripheral portion 19 and the surface of the stainless steel plate 7 adhered to the elastic deformation surface 18 so that a step H is formed. Note that the step H in this configuration is set to 0.4 mm.
【００２６】充放電の繰り返しや経年変化により積層極
板群１０が膨張して二次電池３の厚さが増加して上ケー
ス２ａと下ケース２ｂとの間の電池収容空間の高さを越
えたとき、二次電池３の膨張による圧力は薄肉形成され
て変形しやすくなっている弾性変形面１８を押し出して
弾性変形させる。弾性変形面１８は二次電池３と接触す
る面が平均的に押し上げられ、図８（ｂ）に示すよう
に、変形は外周部１９に接する周辺部で弾性変形する。
本構成におけるリチウムポリマー二次電池の厚さは３．
９１ｍｍで、これが充放電を繰り返した全寿命経過にお
ける膨張による厚さは４．３１ｍｍとなり、０．４ｍｍ
の膨張が生じるデータが取得されている。前述したよう
に、弾性変形面１８上には外周部１９に囲まれた高さ
０．４ｍｍの段差Ｈによる空間が形成されているため、
電池パック１の全寿命が経過した状態でも電池パック１
の最大厚さに変化は生じない。また、弾性変形面１８の
表面には、その周囲を残してステンレス薄板７が貼着さ
れていることにより、二次電池３の平均的な厚さ変化と
相まって周囲の弾性変形により平面状態を保って均等に
外周部１９内に膨出する。Due to repeated charging and discharging and aging, the stacked electrode group 10 expands and the thickness of the secondary battery 3 increases, exceeding the height of the battery housing space between the upper case 2a and the lower case 2b. At this time, the pressure due to the expansion of the secondary battery 3 pushes out the elastically deformable surface 18 which is formed to be thin and is easily deformed, and is elastically deformed. As shown in FIG. 8B, the elastically deforming surface 18 is pushed up on the surface in contact with the secondary battery 3, and the elastically deforming surface 18 elastically deforms in the peripheral portion in contact with the outer peripheral portion 19.
The thickness of the lithium polymer secondary battery in this configuration is 3.
The thickness due to expansion over the entire life after repeated charging and discharging was 4.31 mm, which was 0.4 mm.
The data that causes the expansion of has been acquired. As described above, since the space formed by the step H having a height of 0.4 mm surrounded by the outer peripheral portion 19 is formed on the elastic deformation surface 18,
Even when the entire life of the battery pack 1 has elapsed, the battery pack 1
There is no change in the maximum thickness. Further, since the stainless steel plate 7 is adhered to the surface of the elastic deformation surface 18 except for the periphery thereof, the flat state is maintained by the elastic deformation of the periphery in combination with the average thickness change of the secondary battery 3. And swells evenly in the outer peripheral portion 19.
【００２７】この極板の膨張は、二次電池３の平板面の
一方側の面は弾性変形面１８に当接して弾性圧力が加え
られ、他方側の面はその中央部で上ケース２ａの当接部
１６に当接しているので、二次電池３は積層極板群１０
の積層方向に緊迫力が加えられ、極板の膨張が抑制され
るので、上記のようなパックケース２の厚さの増加はよ
り少なくなる。In the expansion of the electrode plate, one side of the flat surface of the secondary battery 3 is brought into contact with the elastically deformable surface 18 and elastic pressure is applied thereto, and the other side of the plate is in the center of the upper case 2a. Since the secondary battery 3 is in contact with the contact portion 16, the secondary battery 3
Is applied in the stacking direction, and the expansion of the electrode plate is suppressed, so that the increase in the thickness of the pack case 2 as described above is further reduced.
【００２８】また、ガス発生の場合は、弾性変形面１８
によって二次電池３は緊迫力が加えられた状態となって
いるので、外装体１１の膨らみは空間形成部１５ａ〜１
５ｃ及び間隙部１７に逃げ、膨らみを吸収する余地がな
くなったとき、弾性変形面１８が外方に押し出されるこ
とになる。In the case of gas generation, the elastic deformation surface 18
As a result, the secondary battery 3 is in a state in which a tension force is applied, so that the swelling of the exterior body 11 is reduced by the space forming portions 15a to 15a.
When the space 5c and the gap 17 escape and there is no room to absorb the bulge, the elastically deformable surface 18 is pushed outward.
【００２９】以上説明した電池パック１における二次電
池３は、図１０（ａ）に示すように、封筒状に形成した
ラミネートシートに寄って形成した外装体１１ａ内に積
層極板群１０ａを収容して、図１０（ｂ）に示すような
形態に構成した二次電池３ａを用いても同様に構成する
ことができる。As shown in FIG. 10 (a), the secondary battery 3 in the battery pack 1 described above accommodates the laminated electrode group 10a in an exterior body 11a formed close to an envelope-shaped laminated sheet. Then, the same configuration can be obtained by using the secondary battery 3a configured as shown in FIG. 10B.
【００３０】また、本実施形態は、携帯電話機の電池電
源として適用した例について述べたが、モバイルコンピ
ュータや電子手帳、トランシーバ等においても同様の構
成を適用することができる。Although the present embodiment has been described with respect to an example in which the present invention is applied to a battery power source of a mobile phone, the same configuration can be applied to a mobile computer, an electronic organizer, a transceiver, and the like.
【００３１】[0031]
【発明の効果】以上の説明の通り本発明によれば、ラミ
ネートシートによって外装体を形成した二次電池をパッ
クケース内に収容して電池パックを構成した場合に、ガ
ス発生により外装体に膨らみが生じたときにも、二次電
池との間に形成された空間形成部に膨らみを逃がすこと
ができるので、電池パックの外形形状に変化を及ぼして
機器に影響を与えることがない。また、二次電池は位置
規制部によって収容位置からの移動が規制されるので、
振動や衝撃が加わったときの移動がなく、軟質の外装体
内に収容された極板の移動による内部短絡の発生も防止
される。As described above, according to the present invention, when a secondary battery having an outer package formed of a laminate sheet is housed in a pack case to form a battery pack, the battery swells due to gas generation. When swelling occurs, the swelling can be released to the space forming portion formed between the battery and the secondary battery, so that the external shape of the battery pack is not changed and the device is not affected. In addition, since the movement of the secondary battery from the storage position is regulated by the position regulating unit,
There is no movement when vibration or impact is applied, and the occurrence of an internal short circuit due to the movement of the electrode plate accommodated in the soft exterior body is also prevented.
【図１】実施形態に係る電池パックの概略構成を示す斜
視図。FIG. 1 is a perspective view showing a schematic configuration of a battery pack according to an embodiment.
【図２】二次電池の構成を示す断面図。FIG. 2 is a cross-sectional view illustrating a configuration of a secondary battery.
【図３】外装体の構造を示す（ａ）は外装体の平面図、
（ｂ）はＥ−Ｅ線矢視断面図。FIG. 3A is a plan view showing the structure of an exterior body, and FIG.
(B) is a sectional view taken along line EE.
【図４】二次電池の構成を示す（ａ）は平面図、（ｂ）
は側面図。FIG. 4A is a plan view showing a configuration of a secondary battery, and FIG.
Is a side view.
【図５】下ケースに電池保護装置及び電池を配設した状
態を示す平面図。FIG. 5 is a plan view showing a state where a battery protection device and a battery are provided in a lower case.
【図６】電池パックとして完成した状態での（ａ）はＡ
−Ａ線矢視断面図、（ｂ）はＢ−Ｂ線矢視断面図。FIG. 6 (a) shows a state A in a state where the battery pack is completed.
FIG. 3 is a cross-sectional view taken along line A-A, and FIG.
【図７】電池パックとして完成した状態での（ａ）はＣ
−Ｃ線矢視断面図、（ｂ）はＤ−Ｄ線矢視断面図。FIG. 7 (a) shows a state in which C is completed as a battery pack.
FIG. 3 is a sectional view taken along line C-C, and FIG. 3B is a sectional view taken along line D-D.
【図８】ガス発生による二次電池の膨張状態を説明する
（ａ）は正常時、（ｂ）はガス発生時の断面図。FIGS. 8A and 8B are cross-sectional views illustrating the expansion state of the secondary battery due to gas generation, in which FIG. 8A is normal and FIG.
【図９】電池パックとして完成した状態での下ケース側
から見た平面図。FIG. 9 is a plan view of the completed battery pack as seen from the lower case side.
【図１０】二次電池の別態様を示す（ａ）は組み立て
図、（ｂ）は完成状態の斜視図。FIGS. 10A and 10B show another embodiment of a secondary battery, in which FIG. 10A is an assembled view and FIG.
１ 電池パック ２ パックケース ２ａ 上ケース ２ｂ 下ケース ３ 二次電池 １０ 積層極板群 １１ 外装体 １４ａ、１４ｂ、１４ｃ、１４ｄ、１４ｅ、１４ｆ 位
置規制部 １５ａ、１５ｂ、１５ｃ 空間形成部 １６ 当接部 １７ 間隙部DESCRIPTION OF SYMBOLS 1 Battery pack 2 Pack case 2a Upper case 2b Lower case 3 Secondary battery 10 Laminated electrode group 11 Outer body 14a, 14b, 14c, 14d, 14e, 14f Position regulation part 15a, 15b, 15c Space formation part 16 Contact part 17 gap
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤原 潤司 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H011 AA13 BB04 5H020 AA06 AS06 KK11 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junji Fujiwara 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5H011 AA13 BB04 5H020 AA06 AS06 KK11
Claims (3)
に複数の正負極板を積層した積層極板群を封入して矩形
平板形状に形成された二次電池をパックケース内に収容
してなる電池パックにおいて、 前記パックケース内に、前記二次電池の収容位置を規制
する位置規制部位と、二次電池との間に空間を設けた空
間形成部位とが形成されてなることを特徴とする電池パ
ック。1. A battery in which a package formed by laminating a plurality of positive and negative electrode plates in a package made of a laminate sheet and containing a secondary battery formed in a rectangular plate shape is housed in a pack case. In the pack, a battery is characterized in that a position regulating portion that regulates a storage position of the secondary battery and a space forming portion that provides a space between the secondary battery are formed in the pack case. pack.
内面に、二次電池への位置規制部位と空間形成部位とが
適宜形成されてなる請求項１記載の電池パック。2. The battery pack according to claim 1, wherein a position regulating portion and a space forming portion for the secondary battery are appropriately formed on the inner surface of the pack case facing the flat surface of the secondary battery.
面に、少なくとも二次電池の４隅を囲むように位置規制
部位が形成されてなる請求項１記載の電池パック。3. The battery pack according to claim 1, wherein a position regulating portion is formed on an inner surface of the pack case facing a side surface of the secondary battery so as to surround at least four corners of the secondary battery.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23165899A JP3579618B2 (en) | 1999-08-18 | 1999-08-18 | Battery pack |
| EP99943317A EP1033766B1 (en) | 1998-09-11 | 1999-09-13 | Battery pack |
| US09/530,556 US6451474B1 (en) | 1998-09-11 | 1999-09-13 | Resiliently deformable battery pack |
| EP08163835A EP1995819B1 (en) | 1998-09-11 | 1999-09-13 | Battery pack with protective circuit |
| PCT/JP1999/004994 WO2000016416A1 (en) | 1998-09-11 | 1999-09-13 | Battery pack |
| DE69940252T DE69940252D1 (en) | 1998-09-11 | 1999-09-13 | BATTERY PACK |
| NO20002365A NO20002365L (en) | 1998-09-11 | 2000-05-05 | battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23165899A JP3579618B2 (en) | 1999-08-18 | 1999-08-18 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001057190A true JP2001057190A (en) | 2001-02-27 |
| JP3579618B2 JP3579618B2 (en) | 2004-10-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23165899A Expired - Fee Related JP3579618B2 (en) | 1998-09-11 | 1999-08-18 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3579618B2 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003085754A1 (en) * | 2002-04-11 | 2003-10-16 | Nec Corporation | Module containing flat secondary battery |
| WO2005106988A1 (en) * | 2004-04-28 | 2005-11-10 | Toyota Jidosha Kabushiki Kaisha | Laminate type secondary battery and battery pack thereof |
| JP2006190601A (en) * | 2005-01-07 | 2006-07-20 | Central Res Inst Of Electric Power Ind | Laminated cell |
| US7338733B2 (en) | 2002-04-30 | 2008-03-04 | Sanyo Electric Co., Ltd. | Battery pack |
| JP2009526362A (en) * | 2006-02-09 | 2009-07-16 | エルジー・ケム・リミテッド | Battery module |
| CN103367809A (en) * | 2012-03-26 | 2013-10-23 | 苏州纳新新能源科技有限公司 | Explosion-proof battery |
| JP2014053322A (en) * | 2013-11-11 | 2014-03-20 | Dainippon Printing Co Ltd | Electrochemical cell |
| JP2014187036A (en) * | 2012-02-23 | 2014-10-02 | Global Battery Co Ltd | Battery cell case utilizing intaglio structure |
| JP2015032549A (en) * | 2013-08-06 | 2015-02-16 | 株式会社豊田自動織機 | Power storage device |
| JP2018142483A (en) * | 2017-02-28 | 2018-09-13 | オートモーティブエナジーサプライ株式会社 | Secondary battery |
| EP3731295A1 (en) | 2019-04-26 | 2020-10-28 | Toyota Jidosha Kabushiki Kaisha | Secondary battery |
| KR20200125495A (en) | 2019-04-26 | 2020-11-04 | 도요타 지도샤（주） | Secondary battery |
| JP2022156903A (en) * | 2021-03-31 | 2022-10-14 | トヨタ自動車株式会社 | power storage device |
-
1999
- 1999-08-18 JP JP23165899A patent/JP3579618B2/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003085754A1 (en) * | 2002-04-11 | 2003-10-16 | Nec Corporation | Module containing flat secondary battery |
| US7338733B2 (en) | 2002-04-30 | 2008-03-04 | Sanyo Electric Co., Ltd. | Battery pack |
| WO2005106988A1 (en) * | 2004-04-28 | 2005-11-10 | Toyota Jidosha Kabushiki Kaisha | Laminate type secondary battery and battery pack thereof |
| US8334068B2 (en) | 2004-04-28 | 2012-12-18 | Toyota Jidosha Kabushiki Kaisha | Laminate battery with deformation restricting member |
| JP2006190601A (en) * | 2005-01-07 | 2006-07-20 | Central Res Inst Of Electric Power Ind | Laminated cell |
| JP4591923B2 (en) * | 2005-01-07 | 2010-12-01 | 財団法人電力中央研究所 | Multilayer secondary battery |
| JP2009526362A (en) * | 2006-02-09 | 2009-07-16 | エルジー・ケム・リミテッド | Battery module |
| JP2014187036A (en) * | 2012-02-23 | 2014-10-02 | Global Battery Co Ltd | Battery cell case utilizing intaglio structure |
| CN103367809A (en) * | 2012-03-26 | 2013-10-23 | 苏州纳新新能源科技有限公司 | Explosion-proof battery |
| JP2015032549A (en) * | 2013-08-06 | 2015-02-16 | 株式会社豊田自動織機 | Power storage device |
| JP2014053322A (en) * | 2013-11-11 | 2014-03-20 | Dainippon Printing Co Ltd | Electrochemical cell |
| JP2018142483A (en) * | 2017-02-28 | 2018-09-13 | オートモーティブエナジーサプライ株式会社 | Secondary battery |
| EP3731295A1 (en) | 2019-04-26 | 2020-10-28 | Toyota Jidosha Kabushiki Kaisha | Secondary battery |
| KR20200125495A (en) | 2019-04-26 | 2020-11-04 | 도요타 지도샤（주） | Secondary battery |
| US11355802B2 (en) | 2019-04-26 | 2022-06-07 | Toyota Jidosha Kabushiki Kaisha | Secondary battery having improved manufacturability and performance |
| JP2022156903A (en) * | 2021-03-31 | 2022-10-14 | トヨタ自動車株式会社 | power storage device |
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|---|---|
| JP3579618B2 (en) | 2004-10-20 |
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