JP4819399B2 - Thin battery - Google Patents

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JP4819399B2
JP4819399B2 JP2005154117A JP2005154117A JP4819399B2 JP 4819399 B2 JP4819399 B2 JP 4819399B2 JP 2005154117 A JP2005154117 A JP 2005154117A JP 2005154117 A JP2005154117 A JP 2005154117A JP 4819399 B2 JP4819399 B2 JP 4819399B2
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battery
thin
forming member
passage forming
film
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JP2006331874A (en
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猛 金井
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Subaru Corp
NEC Corp
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NEC Corp
Fuji Jukogyo KK
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    • 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

本発明は、ラミネートフィルム等からなる包装体内に電池要素が電解液と共に収容された薄型電池に関する。   The present invention relates to a thin battery in which a battery element is accommodated together with an electrolyte in a package made of a laminate film or the like.

近年、電気自動車などの駆動用電源として、薄型電池（例えばリチウムイオン二次電池）を複数集合させて構成した組電池を用いることが行われている。また、そのような組電池において、電池の充放電性能を最大限に発揮させるためには（あるいは電池の寿命を短縮させないためには）、電池（薄型電池）を冷却する必要があることが知られている。薄型電池は一般に、ラミネートフィルムからなる包装体内に、金属箔の積層体として構成された電池要素が電解液と共に収容された構造となっている。   In recent years, as a driving power source for an electric vehicle or the like, an assembled battery including a plurality of thin batteries (for example, lithium ion secondary batteries) is used. In such an assembled battery, it is known that the battery (thin battery) needs to be cooled in order to maximize the charge / discharge performance of the battery (or in order not to shorten the battery life). It has been. A thin battery generally has a structure in which a battery element configured as a laminated body of metal foil is housed together with an electrolytic solution in a package made of a laminate film.

図８、図９は、特許文献１に開示された従来の薄型電池の構成を示している。薄型電池３５０は、正極用金属箔（不図示）と負極用金属箔とがセパレータを介して交互に積層された電池要素３０２と、その電池要素３０２を収容するための２枚のラミネートフィル３０１を有している。２枚のラミネートフィルム３０１は、その外周部の４辺において互いに熱シールされており、そのうちの一辺から電極タブ３０２ａが引き出されている。この薄型電池３５０は、ラミネートフィルム３０１が波形状に形成されていることを１つの特徴としており、これにより、例えば、図８の矢印Ａ方向に薄型電池３５０を曲げることができるようになっている。
特開２０００−１７３５５９号公報 8 and 9 show the configuration of a conventional thin battery disclosed in Patent Document 1. FIG. The thin battery 350 includes a battery element 302 in which a positive electrode metal foil (not shown) and a negative electrode metal foil are alternately laminated via separators, and two laminate films 301 for accommodating the battery elements 302. Have. The two laminated films 301 are heat-sealed with each other at the four sides of the outer peripheral portion, and the electrode tab 302a is drawn out from one side. This thin battery 350 is characterized in that the laminate film 301 is formed in a wave shape, and thus, for example, the thin battery 350 can be bent in the direction of arrow A in FIG. .
JP 2000-173559 A

このような薄型電池３５０を用いて組電池を構成する場合、例えば図１０に示すようにして電池を積層すれば、波形状部同士の間に空隙が確保され、これを通風路３７０として利用することができるとも考えられる。これによれば、特別なスペーサ等を用いることなく電池同士の間に通風路が確保されるため、組電池の構成を簡素化できる点で有利である。   When an assembled battery is configured using such a thin battery 350, for example, if the batteries are stacked as shown in FIG. 10, a gap is secured between the corrugated portions, and this is used as the ventilation path 370. It is thought that it is possible. According to this, since a ventilation path is ensured between batteries, without using a special spacer etc., it is advantageous at the point which can simplify the structure of an assembled battery.

しかし、特許文献１はそもそも薄型電池３５０をこのようにして積層することは想定しておらず、次のような理由から、このような積層を実現することは困難であると考えられる。すなわち、図１１に示すように、特許文献１の薄型電池では電池要素３０２とフィルム３０１との間には空洞部３０４が生じており、この部分ではフィルムが比較的変形しやくなっている。そのため、図１０のようにして積層した場合、実際にはフィルムが潰れてしまうおそれもあり、この場合、通風路３７０は確保されないこととなる。   However, Patent Document 1 does not assume that the thin battery 350 is laminated in this way, and it is considered difficult to realize such lamination for the following reasons. That is, as shown in FIG. 11, in the thin battery of Patent Document 1, a cavity 304 is formed between the battery element 302 and the film 301, and the film is relatively easily deformed at this portion. Therefore, when laminated as shown in FIG. 10, the film may actually be crushed. In this case, the ventilation path 370 is not secured.

前述の通り、フィルム３０１に形成された波形状部を利用すれば、スペーサ等を利用せずとも通風路３７０を確保することが可能である。しかし、これを実現するためには、フィルム３０１が変形しないように、つまり、通風路３７０が良好に確保されるように、何らからの対策を講じる必要がある。ここで、例えば、空洞部３０４内に補強部材を配置するなどしてフィルムが変形しないようにすることもできようが、これでは、不要な部材を追加することとなり好ましくない。   As described above, if the corrugated portion formed on the film 301 is used, the ventilation path 370 can be secured without using a spacer or the like. However, in order to realize this, it is necessary to take some measures so that the film 301 is not deformed, that is, the air passage 370 is satisfactorily secured. Here, for example, a reinforcing member may be disposed in the hollow portion 304 to prevent the film from being deformed. However, this is not preferable because an unnecessary member is added.

本発明は、上記問題点に鑑みてなされたものであって、その目的は、特別な部材を追加することなくフィルムの波形状部の剛性を確保することができ、しかも放熱を良好に行うことが可能な薄型電池を提供することにある。   The present invention has been made in view of the above problems, and its purpose is to ensure the rigidity of the corrugated portion of the film without adding a special member, and to perform heat dissipation satisfactorily. It is an object to provide a thin battery that can be used.

上記目的を達成するため本発明の薄型電池は、電気的エネルギーを貯留及び出力するように構成された電池要素が、フィルム包装体の内部に電解液と共に収容された薄型電池において、前記電池要素の断面形状が波形状に形成され、前記フィルム包装体には、前記電池要素の外周面に沿うようにして、前記電池要素の波形状と形状を同じくする波形状部が形成されていることを特徴とする。また、上記本発明に関し、フィルム包装体の内部は真空引きされた状態となっていてもよいし、また、上記電池要素の波形状（フィルムの波形状部も同じ）は、サイン波形または台形波形であってもよい。   In order to achieve the above object, a thin battery according to the present invention is a thin battery in which a battery element configured to store and output electrical energy is housed together with an electrolyte in a film package. The cross-sectional shape is formed into a wave shape, and the film packaging body is formed with a wave shape portion having the same shape as the wave shape of the battery element so as to be along the outer peripheral surface of the battery element. And Further, in the present invention, the inside of the film packaging body may be in a vacuumed state, and the waveform of the battery element (the same as the waveform of the film) is a sine waveform or a trapezoidal waveform. It may be.

上記本発明によれば、電池要素が波形断面とされており、フィルム包装体の波形状部はその電池要素の外周面（表面）に沿うようにして形成されている。すなわち、フィルムと電池要素との間に空洞部を生じることなく、フィルム包装体の波形状部が形成されているため、フィルムの波形状部の剛性が十分に確保されたものとなっている。また、フィルムと電池要素との間の空洞部が生じていないことにより、従来の構成と比較して放熱性も良好なものとなっている（この詳細については〔発明を実施するための最良の形態〕の欄内で述べる）。そして、このように波形状に構成された本発明の薄型電池によれば、組電池を構成する際に特別なスペーサ等を要することなく、電池同士の間に通風路を確保することができる。   According to the said invention, the battery element is made into the waveform cross section, and the waveform part of a film packaging body is formed so that the outer peripheral surface (surface) of the battery element may be met. That is, since the corrugated portion of the film package is formed without generating a cavity between the film and the battery element, the rigidity of the corrugated portion of the film is sufficiently ensured. In addition, since the cavity between the film and the battery element does not occur, heat dissipation is better than that of the conventional configuration (for details, see [Best Mode for Carrying Out the Invention] It will be described in the column of “form”] And according to the thin battery of this invention comprised in this way at the time of comprising an assembled battery, a ventilation path can be ensured between batteries, without requiring a special spacer.

また、本発明の他の薄型電池は、それぞれ電気的エネルギーを貯留及び出力するように構成された２つの電池要素と、該２つの電池要素同士の間に配置された通路形成部材と、前記２つの電池要素及び前記通路形成部材を収容するフィルム包装体とを有する薄型電池であって、前記通路形成部材は、前記フィルム包装体を貫通した状態に延在する冷却風通路を複数有し、前記各電池要素の断面形状は波形状に形成され、前記フィルム包装体には、前記電池要素の外周面に沿うようにして、前記電池要素の波形状と形状を同じくする波形状部が形成されている。   Another thin battery of the present invention includes two battery elements each configured to store and output electrical energy, a passage forming member disposed between the two battery elements, and the 2 A thin battery having one battery element and a film package housing the passage forming member, wherein the passage forming member has a plurality of cooling air passages extending through the film packaging body, The cross-sectional shape of each battery element is formed in a corrugated shape, and the film packaging body is formed with a corrugated portion having the same shape as the corrugated shape of the battery element, along the outer peripheral surface of the battery element. Yes.

この薄型電池は、１つのフィルム包装体の内部に２つの電池要素が配置されたものである。２つの電池要素の間には、通路形成部材が配置されており、この通路形成部材が補強部材として、あるいは、電池要素の冷却用部材として機能するようになっている。したがって、電池全体としての剛性が向上すると共に、放熱性も良好に維持される。この薄型電池においても、上記の薄型電池と同じように、電池要素が波形状とされると共にフィルム包装体には波形状部が形成されているため、上記同様、フィルムの波形状部の剛性が十分に確保され、また放熱性も良好なものとなる。   In this thin battery, two battery elements are arranged inside one film package. A passage forming member is disposed between the two battery elements, and this passage forming member functions as a reinforcing member or a cooling member for the battery element. Therefore, the rigidity of the battery as a whole is improved and the heat dissipation is also maintained well. In this thin battery as well, since the battery element has a wave shape and the film packaging body has a wave shape portion as in the above thin battery, the rigidity of the wave shape portion of the film is the same as above. Sufficiently secured and good heat dissipation.

上記本発明の他の薄型電池に関し、前記通路形成部材は、前記電池要素のそれぞれに対向する第１の面及び第２の面を有し、前記電池要素はいずれも、その一方の面が前記第１の面又は第２の面に密着した状態で配置されていることが好ましい。電池要素が通路形成部材に密着していることで、電池要素の熱が通路形成部材に良好に伝わるようになり、結果的に電池の放熱性がより向上するためである。   With respect to the other thin battery of the present invention, the passage forming member has a first surface and a second surface that face each of the battery elements, and each of the battery elements has one of the surfaces described above. It is preferable that they are arranged in close contact with the first surface or the second surface. This is because when the battery element is in close contact with the passage forming member, the heat of the battery element is transmitted to the passage forming member well, and as a result, the heat dissipation of the battery is further improved.

また、前記フィルム包装体はより具体的には、２枚のラミネートフィルムからなるものであって、前記通路形成部材の、前記冷却風通路が開口する部位の近傍は、前記２枚のラミネートフィルムによって挟み込まれているものであってもよい。また、２つの電池要素は、前記通路形成部材を間において互いに対称の構造となっていることが好ましい。また、前記各電池要素の波形状は台形波形であり、前記フィルム包装体の内部は真空引きされた状態となっているものであってもよい。また、前記各冷却風通路の延在方向が、前記電池要素の波形状における波の稜線方向に一致しているものであってもよい。   More specifically, the film package is composed of two laminated films, and the vicinity of the portion where the cooling air passage opens of the passage forming member is formed by the two laminated films. It may be sandwiched. Moreover, it is preferable that the two battery elements have a symmetrical structure with respect to the passage forming member. The wave shape of each battery element may be a trapezoidal waveform, and the inside of the film package may be evacuated. In addition, the extending direction of each cooling air passage may coincide with the ridge line direction of the wave in the wave shape of the battery element.

上述したように本発明の薄型電池によれば、電池要素が波形断面とされており、フィルムの波形状部はこの電池要素の表面に沿うように形成されているため、特別な部材を追加することなくフィルムの波形状部の剛性を確保することができる。また、フィルムと電池要素の間には空洞部が生じないことから、電池の放熱性も良好なものとなる。   As described above, according to the thin battery of the present invention, the battery element has a corrugated cross section, and the corrugated portion of the film is formed along the surface of the battery element, so a special member is added. The rigidity of the corrugated portion of the film can be ensured without any problem. In addition, since no hollow portion is formed between the film and the battery element, the heat dissipation of the battery is also good.

以下、本発明の実施の形態について図面を参照して説明する。
（第１の実施形態）
図１は、本実施形態の薄型電池の構成を示す断面図である。図１に示すように、薄型電池５０は、基本的には従来の構成同様、フィルム包装体を構成するフィルム２４Ａ、２４Ｂ（以下、単にフィルム２４とも言う）と、フィルム包装体内に電解液（不図示）と共に収容される電池要素２２とを有しており、フィルム２４同士を熱シールした封止部２６からは内部の電池要素２２に電気的に接続された電極タブ２５が引き出されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing the configuration of the thin battery of this embodiment. As shown in FIG. 1, the thin battery 50 basically has a film 24A, 24B (hereinafter also simply referred to as a film 24) constituting a film package and an electrolyte solution (non-conductive) in the film package, as in the conventional structure. The electrode tab 25 electrically connected to the internal battery element 22 is drawn out from the sealing part 26 which heat-sealed the films 24 with each other.

電池要素２２は、正極板２３ａ及び負極板２３ｂがセパレータ（不図示）を介して交互に積層されものであり、本実施形態においてはサイン波形の断面形状に形成されている。電池要素２２の厚さは例えば数ｍｍ〜十ｍｍ程度である。正極板２３ａ及び負極板２３ｂそれぞれの材質は、従来一般に用いられるものであれば特に限定されるものではない。   The battery element 22 is formed by alternately stacking positive plates 23a and negative plates 23b via separators (not shown). In the present embodiment, the battery elements 22 are formed in a sine waveform cross-sectional shape. The thickness of the battery element 22 is, for example, about several mm to 10 mm. The material of each of the positive electrode plate 23a and the negative electrode plate 23b is not particularly limited as long as it is generally used.

一例として、正極板２３ａは、金属酸化物などの正極活物資に、カーボンブラックなどの導電材と、ポリ四化フッ化エチレンの水性ディスパージョンなどの接着剤とを、重合比で例えば１００：３：１０の割合で混合したものを、正極側集電体としての金属箔（例えばアルミニウム箔）の両面に塗着、乾燥させ、圧延したのちに所定の大きさに切断したものである。負極板２３ｂは、例えば、正極活物質のリチウムイオンを吸蔵及び放出する負極活物質に、スチレンブタジエンゴム樹脂粉末の水性ディスパージョンを例えば固形分比１００：５で混合し、この混合物を、負極側集電体としての金属箔（例えばニッケル箔又は銅箔）の両面に塗着、乾燥させ、圧延したのちに所定の大きさに切断したものである。   As an example, the positive electrode plate 23a includes a positive electrode active material such as a metal oxide, a conductive material such as carbon black, and an adhesive such as an aqueous dispersion of polytetrafluoroethylene in a polymerization ratio of, for example, 100: 3. : A mixture mixed at a ratio of 10 is applied to both surfaces of a metal foil (for example, an aluminum foil) as a positive electrode side current collector, dried, rolled, and then cut into a predetermined size. For example, the negative electrode plate 23b is prepared by mixing an aqueous dispersion of styrene butadiene rubber resin powder in a solid content ratio of, for example, 100: 5 to a negative electrode active material that absorbs and releases lithium ions of the positive electrode active material, and this mixture is mixed with the negative electrode side. The metal foil (for example, nickel foil or copper foil) as a current collector is coated on both sides, dried, rolled, and then cut into a predetermined size.

このような正極板２３ａ及び負極板２３ｂをセパレータを介して交互に重ね、これをプレス加工することで、波形状をなす電池要素２２が得られる。電池要素２２を包装する際、真空引きを行いながら２枚のフィルム２４Ａ、２４Ｂ同士を熱シールすることが好ましい。これにより、フィルム包装体の内部が真空状態（大気圧より低い気圧状態をいう）となり、各フィルム２４Ａ、２４Ｂの内側面が電池要素２２の外周面に密着して沿うこととなる。   Such positive electrode plates 23a and negative electrode plates 23b are alternately stacked via separators and pressed to obtain a battery element 22 having a wave shape. When packaging the battery element 22, it is preferable to heat-seal the two films 24A and 24B while evacuating. Thereby, the inside of a film packaging body will be in a vacuum state (it says the atmospheric pressure state lower than atmospheric pressure), and the inner surface of each film 24A, 24B will closely_contact | adhere to the outer peripheral surface of the battery element 22.

なお、フィルム２４Ａ、２４Ｂに対しては、例えばプレス加工等により予め波形状が付与されていてもよい。フィルムが比較的軟らかい場合、真空引きを行った際にフィルムが電池要素の外形に沿って密着するため、こうした事前のプレス加工は不要である。   It should be noted that the films 24A and 24B may be preliminarily provided with a wave shape by, for example, pressing. When the film is relatively soft, such pre-pressing is not necessary because the film adheres along the outer shape of the battery element when evacuation is performed.

図２は、薄型電池５０を重ね合せて組電池を構成した例を示している。２つの薄型電池５０を、互いのフィルム２４Ｂ同士が対向するように上下を反転させて重ねることで、波形状部の谷部同士の間に通風路７０が形成されることとなる。本実施形態の構成によれば電池同士の間に特別のスペーサ等を介在させなくとも通風路７０が形成されるという利点があるが、もっとも、必要に応じてスペーサ等を用いることも可能である。   FIG. 2 shows an example in which an assembled battery is configured by superimposing thin batteries 50. The two thin batteries 50 are turned upside down so as to face each other so that the films 24B face each other, whereby the ventilation path 70 is formed between the trough portions of the corrugated portion. According to the configuration of the present embodiment, there is an advantage that the ventilation path 70 is formed without interposing a special spacer or the like between the batteries, but it is possible to use a spacer or the like if necessary. .

電極タブ２５同士は、例えばレーザ溶接を利用して互いに接合することができる。波形状部の谷部がこのように通風路７０を構成することに鑑みれば、谷部の延在方向（すなわち波の稜線）は、従来の構成と同じように例えば電池の短手方向にまっすぐとなっていることが好ましく、これにより、通風路７０もまっすぐに形成されることとなる。   The electrode tabs 25 can be joined together using, for example, laser welding. In view of the fact that the trough portion of the corrugated portion constitutes the ventilation path 70 in this way, the extending direction of the trough portion (that is, the ridge line of the wave) is, for example, straight in the short direction of the battery as in the conventional configuration. Preferably, the ventilation path 70 is also formed straight.

本実施形態の薄型電池５０では、電池要素２２が波形断面とされており、フィルム２４には、その電池要素２２の外周面に沿うような波形状部が形成されている。したがって、従来の構成のようにフィルムと電池要素との間に空洞部３０４（図１１参照）が生じることはない。このような構成によれば、フィルム２４の波形状部に剛性が確保されるため、図２のようにして電池同士を重ね合せたとしてもフィルムが変形することはなく、通風路７０が良好に確保されるものとなる。   In the thin battery 50 of the present embodiment, the battery element 22 has a corrugated cross section, and the film 24 is formed with a corrugated portion along the outer peripheral surface of the battery element 22. Therefore, unlike the conventional configuration, the cavity 304 (see FIG. 11) does not occur between the film and the battery element. According to such a configuration, rigidity is ensured in the corrugated portion of the film 24. Therefore, even if the batteries are overlapped as shown in FIG. 2, the film is not deformed, and the ventilation path 70 is excellent. It will be secured.

また、本実施形態のように電池要素２２が波形状となっている場合、電池要素の外形形状を拡大することなく、正極板２３及び負極板２４の表面積を大きくすることできるため、電池の高出力化にも有利である。また、本実施形態の構成は、図１１の構成のように空洞部３０４が生じるものではないため、放熱の観点からも有利である。すなわち図１１の構成では、空洞部３０４があるため、通風路内に送られる冷媒（冷却風）と電池要素との間の熱交換が効率的に実施されないと考えられる。これに対し、本実施形態の構成では空洞部が生じていないため、冷媒と電池要素２２との間の熱交換が良好になされるものとなる。   Further, when the battery element 22 has a wave shape as in the present embodiment, the surface area of the positive electrode plate 23 and the negative electrode plate 24 can be increased without enlarging the outer shape of the battery element. It is also advantageous for output. Further, the configuration of the present embodiment is advantageous from the viewpoint of heat dissipation because the hollow portion 304 is not generated unlike the configuration of FIG. That is, in the configuration of FIG. 11, since there is the hollow portion 304, it is considered that heat exchange between the refrigerant (cooling air) sent into the ventilation path and the battery element is not efficiently performed. On the other hand, in the configuration of the present embodiment, since no hollow portion is generated, heat exchange between the refrigerant and the battery element 22 is favorably performed.

また、本実施形態の構成では電池要素２２が波形断面とされているため、例えば図８の矢印Ｂ方向の外力が加わったとしても電池の変形は最小限に抑えられる。これは、波の稜線方向に関し、電池要素の剛性が向上したことに起因するものである。   Further, in the configuration of the present embodiment, since the battery element 22 has a corrugated cross section, even if an external force in the direction of arrow B in FIG. This is due to the improved rigidity of the battery element with respect to the wave ridgeline direction.

なお、波形状部の形状（谷部の深さ、あるいは谷部同士の間隔等）は適宜変更可能である。また、波形状はサイン波形に限らず、例えば矩形波形又は台形波形が連続するようなものであってもよい。また、フィルム２４Ａ、２４Ｂの具体的な一例としては、例えば、熱溶融性を有する樹脂層と、金属薄膜などからなる非通気層と、ナイロンなどからなる保護層とがこの順番に積層された３層構造のラミネートフィルムであってもよい。   Note that the shape of the corrugated portion (the depth of the valleys or the interval between the valleys) can be changed as appropriate. Further, the wave shape is not limited to a sine waveform, and for example, a rectangular waveform or a trapezoidal waveform may be continuous. Further, as a specific example of the films 24A and 24B, for example, a resin layer having heat melting property, a non-venting layer made of a metal thin film, and a protective layer made of nylon or the like are laminated in this order. A laminate film having a layer structure may be used.

（第２の実施形態）
電池要素の断面形状が台形波形である薄型電池の例について、図３〜図５を参照して説明する。なお、図３〜図５に示す薄型電池１５０では、電池要素の断面が台形波状とされていることに加え、１つのフィルム包装体内に２つの電池要素１２２Ａ、１２２Ｂが配置された構成となっている。すなわち、この薄型電池１５０は、通路形成部材１３０を挟み込むようにして、２つの電池要素１２２Ａ、１２２Ｂが配置されたいわゆるサンドイッチ型の構造となっている。 (Second Embodiment)
An example of a thin battery in which the cross-sectional shape of the battery element has a trapezoidal waveform will be described with reference to FIGS. In addition, in the thin battery 150 shown in FIGS. 3-5, in addition to the cross section of a battery element being trapezoid wave shape, it becomes the structure by which two battery element 122A, 122B is arrange | positioned in one film packaging body. Yes. That is, the thin battery 150 has a so-called sandwich type structure in which two battery elements 122A and 122B are arranged so as to sandwich the passage forming member 130 therebetween.

まず、このようなサンドイッチ型の構造の基本的な考え方について、図６、図７を参照して説明する。なお、図６、図７では、本実施形態の構成要素と区別するため図３〜図５とは異なる符号を付して各構成要素を示している。   First, the basic concept of such a sandwich type structure will be described with reference to FIGS. In FIG. 6 and FIG. 7, each component is shown with a reference numeral different from that in FIGS. 3 to 5 in order to distinguish it from the component of the present embodiment.

図６、図７に示す薄型電池２５０は、２つの電池要素２２２Ａ、２２２Ｂと、それらの間に配置される偏平な通路形成部材２３０とを有している。１つの電池要素は例えば３．６Ｖ程度の起電力を出力するものであり、本構成ではこれが２つあるために倍の出力（７．２Ｖ程度）が得られるようになっている。   The thin battery 250 shown in FIGS. 6 and 7 has two battery elements 222A and 222B, and a flat passage forming member 230 disposed therebetween. One battery element outputs, for example, an electromotive force of about 3.6V, and in this configuration, since there are two of them, a double output (about 7.2V) can be obtained.

通路形成部材２３０は樹脂成形品であり、リブによって仕切られた冷却風通路２３２（高さ寸法が例えば１．５〜２．０ｍｍ程度）を複数有している。薄型電池の完成状態では、図７に示すように、この通路形成部材２３０の短手方向の両端がフィルムの封止部２２６に挟み込まれている。これにより、冷却風通路２３２はフィルムによって塞がれることなく、フィルム外包体を貫通した状態となっている。この冷却風通路２３２内に冷却風を送ることにより、電池要素からの熱が外部に逃がされるようになっている。   The passage forming member 230 is a resin molded product, and has a plurality of cooling air passages 232 (height dimensions are about 1.5 to 2.0 mm, for example) partitioned by ribs. In the completed state of the thin battery, as shown in FIG. 7, both ends in the short direction of the passage forming member 230 are sandwiched between the sealing portions 226 of the film. Thus, the cooling air passage 232 is in a state of penetrating the film outer package without being blocked by the film. By sending cooling air into the cooling air passage 232, heat from the battery element is released to the outside.

通路形成部材２３０を用いることなく、単に２つの電池要素２２２Ａ、２２２Ｂを積層する構成では電池要素の内部に熱がこもりやすく、それに起因した問題も生じやすい。これに対して、図６、図７に示すサンドイッチ型の構造によれば、電池要素同士の間に冷却風通路２３２が確保されているため、放熱を良好に行うことができるという利点がある。また、この薄型電池では、通路形成部材２３０が補強部材としても機能することから、薄型電池全体としての剛性が向上するという利点もある。   In the configuration in which the two battery elements 222A and 222B are simply stacked without using the passage forming member 230, heat easily accumulates in the battery elements, and problems due to the heat tend to occur. On the other hand, according to the sandwich type structure shown in FIGS. 6 and 7, since the cooling air passage 232 is secured between the battery elements, there is an advantage that heat radiation can be performed satisfactorily. Further, in this thin battery, since the passage forming member 230 also functions as a reinforcing member, there is an advantage that the rigidity of the thin battery as a whole is improved.

再び図３を参照する。本実施形態に係る薄型電池１５０は、こうしたサンドイッチ型構造の利点を保ちつつ、電池要素の断面形状を波形状にしたものである。すなわち、図６の電池要素２２２Ａ、２２２Ｂに代えて電池要素１２２Ａ、１２２Ｂが配置されており、通路形成部材２３０に代えて、複数の冷却風通路１３２を有する通路形成部材１３０が配置されている。   Refer to FIG. 3 again. The thin battery 150 according to the present embodiment is obtained by corrugating the cross-sectional shape of the battery element while maintaining the advantages of such a sandwich structure. That is, battery elements 122A and 122B are arranged instead of the battery elements 222A and 222B of FIG. 6, and a passage forming member 130 having a plurality of cooling air passages 132 is arranged instead of the passage forming member 230.

各電池要素１２２Ａ、１２２Ｂはいずれも同じ構成であり、その断面形状は台形の波形状となっている。各電池要素を構成する正極板１２３ａ及び負極板１２３ｂは、第１の実施形態の正極板２３ａ及び負極板２３ｂと同様のものを使用可能である。   Each of the battery elements 122A and 122B has the same configuration, and the cross-sectional shape thereof is a trapezoidal wave shape. The positive electrode plate 123a and the negative electrode plate 123b constituting each battery element can be the same as the positive electrode plate 23a and the negative electrode plate 23b of the first embodiment.

２つの電池要素１２２Ａ、１２２Ｂは、通路形成部材１３０を間において互いに対称の構造となっており、一方の電池要素の山部１２７の反対側には、他方の電池要素の山部１２７が存在している。それぞれの山部１２７ではフィルムの表面が平坦になっており、これにより、電池同士の重ね合せが良好にできるようになっている。   The two battery elements 122A and 122B have a symmetric structure with respect to the passage forming member 130. On the opposite side of the peak part 127 of one battery element, the peak part 127 of the other battery element exists. ing. In each peak portion 127, the surface of the film is flat so that the batteries can be satisfactorily overlapped.

図４は、薄型電池１５０を重ね合せて組電池を構成した例を示している。２つの薄型電池１５０を、各電池の山部１２７同士が互いに接触するように重ねることで、波形状部の谷同士の間に断面六角形状の通風路１７０が形成される。通風路１７０は、冷却風通路１３２と同じ方向に延在しており、また、通風路１７０の開口と冷却風通路１３２の開口とはいずれも同じ方向を向いている。このような構成によれば、各通路１３２、１７０に冷却風を送り込むためのダクト（不図示）を構成しやすいという利点がある。   FIG. 4 shows an example in which an assembled battery is configured by superimposing thin batteries 150. By stacking the two thin batteries 150 so that the peak portions 127 of each battery are in contact with each other, an air passage 170 having a hexagonal cross section is formed between the valleys of the corrugated portions. The ventilation path 170 extends in the same direction as the cooling air passage 132, and the opening of the ventilation path 170 and the opening of the cooling air passage 132 both face the same direction. According to such a structure, there exists an advantage that it is easy to comprise the duct (not shown) for sending cooling air into each channel | path 132,170.

図５には、薄型電池１５０の側縁部の一部が拡大して示されている。図示するように、通路形成部材１３０は、冷却風通路１３２が開口する部位の近傍が２枚のフィルム１２４Ａ、１２４Ｂによって挟み込まれている。この場合、各フィルムの内側面が、例えば熱シールにより通路形成部材の外周面に接合されていてもよい。あるいは、接着剤等を介在させた状態で、フィルムの内側面と通路形成部材の外周面とが接合されていてもよい。   FIG. 5 shows an enlarged part of the side edge of the thin battery 150. As shown in the drawing, the passage forming member 130 is sandwiched between two films 124A and 124B in the vicinity of a portion where the cooling air passage 132 is opened. In this case, the inner surface of each film may be joined to the outer peripheral surface of the passage forming member by heat sealing, for example. Or the inner surface of a film and the outer peripheral surface of a channel | path formation member may be joined in the state which interposed the adhesive agent etc.

以上説明した本実施形態によれば、電池要素１２２Ａ、１２２Ｂが波形状とされていることによる、第１の実施形態同様の利点が得られる。また、薄型電池１５０は、２つの電池要素が通路形成部材を挟み込むように配置されたサンドイッチ型構造となっているため、放熱性や剛性を損なうことなく、電池要素２個分の出力が得られるようになっている。   According to the present embodiment described above, advantages similar to those of the first embodiment can be obtained because the battery elements 122A and 122B have a wave shape. Further, since the thin battery 150 has a sandwich structure in which two battery elements are arranged so as to sandwich the passage forming member, an output equivalent to two battery elements can be obtained without impairing heat dissipation and rigidity. It is like that.

なお、電池要素からの熱を良好に放熱する観点からすれば、電池要素１２２Ａの下面と通路形成部材１３０の上面（第１の面）とが密着するような構成となっていることが好ましい。すなわち、電池要素の下面と通路形成部材の上面とが相補的な形状となっていることが好ましい。これは、電池要素１２２Ｂの上面と通路形成部材１３０の下面（第２の面）との関係においても同様である。このように、電池要素と通路形成部材とが互いに密着する構成となっていることにより、電池要素の熱が通路形成部材に良好に伝わるようになる。通路形成部材に伝わった熱は、冷却風通路１３２内に送られる冷媒（冷却風）との間で熱交換され外部に逃がされる。   From the viewpoint of favorably dissipating heat from the battery element, it is preferable that the lower surface of the battery element 122A and the upper surface (first surface) of the passage forming member 130 are in close contact with each other. That is, it is preferable that the lower surface of the battery element and the upper surface of the passage forming member have a complementary shape. The same applies to the relationship between the upper surface of the battery element 122B and the lower surface (second surface) of the passage forming member 130. As described above, since the battery element and the passage forming member are in close contact with each other, the heat of the battery element is favorably transmitted to the passage forming member. The heat transmitted to the passage forming member is exchanged with the refrigerant (cooling air) sent into the cooling air passage 132 and released to the outside.

なお、通路形成部材１３０における冷却風通路１３２同士の間隔は特に限定されるものではないが、各冷却風通路１３２は等間隔で配置されていることが好ましい。これにより、電池要素に対する冷却が均一的なものとなる。通路形成部材１３０は樹脂成形品に限らず、例えば絶縁性の２枚の板部材が対向配置されてなるものであってもよい。具体的な材質の一例を挙げれば、該板部材は、例えば金属等の熱良導体に電気絶縁材をコーティングしたものであってもよい。金属等の熱良導体を用いることによって、冷却風通路１３２内の冷媒と電池要素との間の熱交換が良好になされるものとなる。   The interval between the cooling air passages 132 in the passage forming member 130 is not particularly limited, but the cooling air passages 132 are preferably arranged at equal intervals. Thereby, the cooling with respect to a battery element becomes uniform. The passage forming member 130 is not limited to a resin molded product, and for example, two insulating plate members may be arranged to face each other. If an example of a specific material is given, this plate member may be obtained by coating an electrically insulating material on a heat good conductor such as metal. By using a good heat conductor such as a metal, heat exchange between the refrigerant in the cooling air passage 132 and the battery element can be performed satisfactorily.

以上、本発明について２つの実施形態を例に挙げて説明したが、各実施形態の構成は互いに組み合わされて使用されてもよい。例えば、第２の実施形態の構成において電池要素の波形状をサイン波形とすることも可能である。   As described above, the present invention has been described by taking two embodiments as examples. However, the configurations of the embodiments may be used in combination with each other. For example, in the configuration of the second embodiment, the waveform of the battery element can be a sine waveform.

第１の実施形態に係る薄型電池の構成を示す断面図である。It is sectional drawing which shows the structure of the thin battery which concerns on 1st Embodiment. 図１の薄型電池を重ね合せて組電池を構成した例を示す図である。It is a figure which shows the example which comprised the thin battery of FIG. 第２の実施形態に係る薄型電池の構成を示す断面図である。It is sectional drawing which shows the structure of the thin battery which concerns on 2nd Embodiment. 図３の薄型電池を重ね合せて組電池を構成した例を示す図である。It is a figure which shows the example which comprised the thin battery of FIG. 3 on which the assembled battery was comprised. 図３の薄型電池の側縁部を一部拡大して示す斜視図である。It is a perspective view which expands and partially shows the side edge part of the thin battery of FIG. 第２の実施形態に係る薄型電池の基本的な構成について説明するための分解斜視図である。It is a disassembled perspective view for demonstrating the basic structure of the thin battery which concerns on 2nd Embodiment. 図６の薄型電池の完成状態を示す外観斜視図である。It is an external appearance perspective view which shows the completion state of the thin battery of FIG. 従来の薄型電池の構成を示す外観斜視図である。It is an external appearance perspective view which shows the structure of the conventional thin battery. 図８の薄型電池の構成を示す分解斜視図である。It is a disassembled perspective view which shows the structure of the thin battery of FIG. 従来の薄型電池を重ね合せて組電池を構成した例を示す図である。It is a figure which shows the example which comprised the conventional thin battery and overlapped and comprised the assembled battery. 図８の薄型電池の内部構造を示す断面図である。It is sectional drawing which shows the internal structure of the thin battery of FIG.

符号の説明Explanation of symbols

２２、１２２Ａ、１２２Ｂ 電池要素
２３ａ、１２３ａ 正極板
２３ｂ、１２３ｂ 負極板
２４Ａ、２４Ｂ、１２４Ａ、１２４Ｂ フィルム
２５、１２５ 電極タブ
２６ 封止部
１２７ 山部
１３０ 通路形成部材
１３２ 冷却風通路
５０、１５０ 薄型電池
７０、１７０ 通風路 22, 122A, 122B Battery element 23a, 123a Positive electrode plate 23b, 123b Negative electrode plate 24A, 24B, 124A, 124B Film 25, 125 Electrode tab 26 Sealing portion 127 Mountain portion 130 Passage forming member 132 Cooling air passage 50, 150 Thin battery 70, 170 Ventilation path

Claims (6)

それぞれ電気的エネルギーを貯留及び出力するように構成された２つの電池要素と、該２つの電池要素同士の間に配置された通路形成部材と、前記２つの電池要素及び前記通路形成部材を収容するフィルム包装体とを有する薄型電池であって、
前記通路形成部材は、前記フィルム包装体を貫通した状態に延在する冷却風通路を複数有し、前記各電池要素の断面形状は波形状に形成され、前記フィルム包装体には、前記電池要素の外周面に沿うようにして、前記電池要素の波形状と形状を同じくする波形状部が形成されている薄型電池。 Two battery elements each configured to store and output electrical energy, a passage forming member disposed between the two battery elements, and the two battery elements and the passage forming member are accommodated. A thin battery having a film package,
The passage forming member has a plurality of cooling air passages extending in a state of penetrating the film packaging body, and each battery element has a corrugated cross-sectional shape. A thin battery in which a corrugated portion having the same shape as the corrugated shape of the battery element is formed along the outer peripheral surface of the battery. 前記通路形成部材は、前記電池要素のそれぞれに対向する第１の面及び第２の面を有し、前記電池要素はいずれも、その一方の面が前記第１の面又は第２の面に密着した状態で配置されている、請求項１に記載の薄型電池。 The passage forming member has a first surface and a second surface facing each of the battery elements, and each of the battery elements has one surface on the first surface or the second surface. The thin battery according to claim 1 , wherein the thin battery is arranged in close contact. 前記フィルム包装体は２枚のラミネートフィルムからなるものであって、前記通路形成部材の、前記冷却風通路が開口する部位の近傍は、前記２枚のラミネートフィルムによって挟み込まれている、請求項１又は２に記載の薄型電池。 The film package can be comprised of two laminated films, near the site where the passage forming member, said cooling air passage is opened is sandwiched by the two laminated films, according to claim 1 Or the thin battery of 2 . 前記２つの電池要素は、前記通路形成部材を間において互いに対称の構造となっている、請求項１乃至請求項３のいずれか１項に記載の薄型電池。 It said two battery elements, wherein has the structure symmetrical with each other during the passage forming member, thin battery according to any one of claims 1 to 3. 前記各電池要素の波形状は台形波形であり、前記フィルム包装体の内部は真空引きされた状態となっている、請求項１乃至請求項４のいずれか１項に記載の薄型電池。 The corrugated each battery element is a trapezoidal waveform, the interior of the film package is in a state of being evacuated, thin battery according to any one of claims 1 to 4. 前記各冷却風通路の延在方向が、前記電池要素の波形状における波の稜線方向に一致している、請求項１乃至請求項５のいずれか１項に記載の薄型電池。 The extending direction of the cooling air passages, the match in the ridge line direction of the wave in the battery element of the wave-shaped, thin battery according to any one of claims 1 to 5.
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