JP6932532B2 - バッテリモジュール - Google Patents
バッテリモジュール Download PDFInfo
- Publication number
- JP6932532B2 JP6932532B2 JP2017074123A JP2017074123A JP6932532B2 JP 6932532 B2 JP6932532 B2 JP 6932532B2 JP 2017074123 A JP2017074123 A JP 2017074123A JP 2017074123 A JP2017074123 A JP 2017074123A JP 6932532 B2 JP6932532 B2 JP 6932532B2
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- JP
- Japan
- Prior art keywords
- battery
- exterior body
- positive electrode
- negative electrode
- battery module
- 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.)
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- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M50/50—Current conducting connections for cells or batteries
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- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
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Landscapes
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Description
本発明の一態様は、バッテリと、バッテリを覆う第1の外装体と、を有するバッテリモジュールである。
ここでは、バッテリモジュールの形態として、腕時計型の電子機器に好適に装着することのできるバンド状の形態を例に説明する。なお、以下で説明する方法は、型の形状を変更することにより、様々な形状のバッテリモジュールを作製できることは言うまでもない。
図3(A)乃至(D)に、以下で説明する作製方法例での各段階における断面概略図を示す。ここで例示する方法は、上記作製方法例と比較して、形状の異なる型50c及び型50dを用いる点で相違している。
上記構成例では、バッテリモジュール10の電極として、バッテリ30が有するタブ32の突出した一部を用いた場合の例を示したが、他の構成としてもよい。
上記で例示したように、外装体20をバンド形状としたとき、バッテリ30が設けられている部分の外装体20の厚さは、他の部分の厚さよりも薄くなる場合がある。このとき、外部から局所的に大きな力が、外装体20の表面に垂直な向きにかかった場合には、バッテリ30が変形してしまう、または破損してしまう恐れもある。そこで、バッテリ30の表面を保護する保護部材を、外装体20の内部に配置することが好ましい。
以下では、電子機器を取り付けることのできるフレームを有するバッテリモジュールの例について説明する。
従来の金属などの硬い外装体を用いた場合では、落下させてしまう、またはぶつけてしまうなどの場合に変形や破損してしまう恐れがあった。特に携帯型の電子機器では、このような危険性が高かった。一方、本発明の一態様によれば、弾性体を含む外装体がバッテリを覆って形成できるため、耐衝撃性に優れる。そのため、従来のバッテリモジュールと置き換え可能な構成とすることで、バッテリモジュールを使用する電子機器の信頼性を格段に向上させることができる。
本発明の一態様の外装体の成型方法は、バッテリを有するバッテリモジュールだけに限られず、様々な電子部品を内蔵したモジュールにも適用することができる。これにより、耐衝撃性に優れたモジュールを実現することができる。
以下では、本発明の一態様に用いることのできる二次電池の構成例と、その作製方法例について、図面を参照して説明する。特に、以下では、曲げることのできる二次電池の例について説明する。
図13は二次電池102の外観を示す斜視図である。図14(A)は、図13にA1−A2の一点鎖線で示した部位の断面図である。また、図14(B)は、図13にB1−B2の一点鎖線で示した部位の断面図である。
正極511は、正極集電体501と、正極集電体501上に形成された正極活物質層502などにより構成される。図14ではシート状(又は帯状)の正極集電体501の一方の面に正極活物質層502を有する正極511を1枚、両面に正極活物質層502を有する正極511を1枚有する例を示しているが、本発明の一態様はこれに限らない。正極集電体501の一方の面に正極活物質層502を有する正極511のみを用いてもよい。また両面に正極活物質層502を有する正極511のみを用いてもよい。両面に正極活物質層502を有する正極511を用いることで、二次電池102の容量を大きくすることができる。また3枚以上の正極511を有する二次電池102としてもよい。二次電池102が有する正極511を増やすと、二次電池102の容量を大きくすることができる。
負極515は、負極集電体505と、負極集電体505上に形成された負極活物質層506などにより構成される。図14ではシート状(又は帯状)の負極集電体505の一方の面に負極活物質層506を有する負極515を1枚、両面に負極活物質層506を有する負極515を1枚有する例を示しているが、本発明の一態様はこれに限らない。負極集電体505の一方の面に負極活物質層506を有する負極515のみを用いてもよい。この場合、負極集電体505の負極活物質層506を有さない面同士が接触するように配置すると、摩擦の少ない接触面を形成することができ、二次電池102を湾曲した際の応力を逃がしやすく好ましい。また負極集電体505の両面に負極活物質層506を有する負極515のみを用いてもよい。両面に負極活物質層506を有する負極515を用いることで、二次電池102の容量を大きくすることができる。また3枚以上の負極515を有する二次電池102としてもよい。二次電池102が有する負極515を増やすことで、二次電池102の容量を大きくすることができる。
セパレータ503を形成するための材料として、セルロースや、ポリプロピレン(PP)、ポリエチレン(PE)、ポリブテン、ナイロン、ポリエステル、ポリスルホン、ポリアクリロニトリル、ポリフッ化ビニリデン、テトラフルオロエチレン、ポリフェニレンサルファイド等の多孔性絶縁体を用いることができる。また、ガラス繊維等の不織布や、ガラス繊維と高分子繊維を複合した隔膜を用いてもよい。
電解液504は、電解質として、キャリアイオンが移動可能であり、且つキャリアイオンであるリチウムイオンを有する材料を用いる。電解質の代表例としては、LiPF6、LiClO4、LiAsF6、LiBF4、LiCF3SO3、Li(CF3SO2)2N、Li(C2F5SO2)2N、Li(SO2F)2N等のリチウム塩がある。これらの電解質は、一種を単独で用いてもよく、二種以上を任意の組み合わせ及び比率で用いてもよい。
二次電池の構造としては、様々な構造があるが、本実施の形態では、外装体507の形成にフィルムを用いる。なお、外装体507を形成するためのフィルムは金属フィルム(アルミニウム、ステンレス、ニッケル鋼など)、有機材料からなるプラスチックフィルム、有機材料(有機樹脂や繊維など)と無機材料(セラミックなど)とを含むハイブリッド材料フィルム、炭素含有無機フィルム(カーボンフィルム、グラファイトフィルムなど)から選ばれる単層フィルムまたはこれら複数からなる積層フィルムを用いる。金属フィルムは、エンボス加工を行いやすく、エンボス加工を行って凹部または凸部を形成すると外気に触れる外装体507の表面積が増大するため、放熱効果に優れている。
以下では、上記二次電池102の作製方法の一例について説明する。
まず、セパレータ503上に正極活物質層502が形成された正極511を配置する(図15(A)参照。)。なお図15(A)では、スリットを形成することにより蛇行形状となった正極集電体501の、両面に正極活物質層502を有する例を示す。
次に、負極515を用意する(図15(C)参照)。図15(C)では、スリットを形成することにより蛇行形状となった負極集電体505の、両面に負極活物質層506を有する例を示す。
次に、正極511および負極515を積み重ねる(図16(A)参照。)。本実施の形態では、正極511および負極515を2枚ずつ用いる例を示す。
外装体に用いるフィルム折り曲げ、重なり合った一辺を熱圧着により接合する。図16(B)に外装体507の一辺を熱圧着により接合した部位を、接合部507aとして示す。この外装体507で、正極511および負極515を覆う。
次に、正極リード521が有する封止層520および負極リード525が有する封止層520と重畳する外装体507の一辺を、同様に熱溶着する(図17(A))。その後、図17(A)に示す、外装体507の封止されていない辺507bから、電解液504を外装体507で覆われた領域に入れる。
二次電池102の変形例として、図18(A)に二次電池102を示す。図18(A)に示す二次電池102は、図16の二次電池102と比べて正極リード521と負極リード525の配置が異なる。具体的には、図16の二次電池102では正極リード521および負極リード525が外装体507の同じ辺に配置されているが、図18の二次電池102では正極リード521および負極リード525をそれぞれ外装体507の異なる辺に配置している。このように、本発明の一態様の二次電池は、リード電極を自由に配置することができるため、設計自由度が高い。よって、本発明の一態様の二次電池を用いた製品の設計自由度を高めることができる。また、本発明の一態様の二次電池を用いた製品の生産性を高めることができる。
本実施の形態では、繰り返し曲げ伸ばしを行う用途に適した電池の構成例について説明する。
20 外装体
21 第1の部分
21a スリット
21b スリット
21c スリット
22 第2の部分
23 凹部
24 開口端
25 空間
26a 孔
26b 孔
30 バッテリ
30a バッテリ
31 外装体
32 タブ
33 回路基板
34 FPC
35 保護部材
35a 板部
35b 板部
35c 接合部
41a 第1の部分
41b 第1の部分
42 第2の部分
50a 型
50b 型
50c 型
50d 型
51a 上型
51b 下型
52a 上型
52b 下型
53 中子
54a 中子
54b 中子
55a 注入孔
55b 注入孔
60 バッテリモジュール
61 バンド部
62 バンド部
63 保持部
64 操作ボタン
70 フレーム
71 端子
72 端子
75 ケース
80 電子機器
81 筐体
82 表示部
83 端子
84 端子
90 バッテリモジュール
91 ケース
91a トップカバー
91b ボトムカバー
92 端子
94 凹部
95 第1の部分
96 第2の部分
97 外装体
102 二次電池
200 電池
201 外装体
202 積層体
203 タブ
211 折り曲げ部
213 接合部
214 接合部
221 稜線
222 谷線
225 空間
231 電極
232 電極
501 正極集電体
502 正極活物質層
503 セパレータ
503a 接合部
504 電解液
505 負極集電体
506 負極活物質層
507 外装体
507a 接合部
507b 辺
511 正極
511a 領域
515 負極
520 封止層
521 正極リード
525 負極リード
Claims (1)
- 第1の外装体と、バッテリと、を有するバッテリモジュールであって、
前記バッテリは、第2の外装体と、正極と、負極と、電解質と、一対のタブと、を有し、
前記正極、前記負極、及び前記電解質は、前記第2の外装体内に位置し、
一対の前記タブは、前記第2の外装体の内部から外側に突出して設けられ、
前記第1の外装体は、弾性を示す材料を含み、
前記第1の外装体は、第1の部分と、第2の部分と、前記第1の部分と前記第2の部分とに囲まれた空間と、を有し、
前記第2の外装体は、前記空間内に配置され、
前記第1の部分は、開口端を有する凹部が形成され、
前記開口端の近傍は、斜めに切りかかれた形状を有し、
前記第1の部分と、前記第2の部分とは、前記開口端において互いに接合され、
前記第2の部分は、前記タブの一部、及び前記第2の外装体の端部と接する、バッテリモジュール。
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KR20180132686A (ko) | 2018-12-12 |
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TWI737711B (zh) | 2021-09-01 |
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JP2017195179A (ja) | 2017-10-26 |
US10930904B2 (en) | 2021-02-23 |
US11600883B2 (en) | 2023-03-07 |
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