JP2012094569A - Power storage unit - Google Patents
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- JP2012094569A JP2012094569A JP2010238203A JP2010238203A JP2012094569A JP 2012094569 A JP2012094569 A JP 2012094569A JP 2010238203 A JP2010238203 A JP 2010238203A JP 2010238203 A JP2010238203 A JP 2010238203A JP 2012094569 A JP2012094569 A JP 2012094569A
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Classifications
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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
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- Connection Of Batteries Or Terminals (AREA)
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Abstract
Description
本発明は各種電子機器、ハイブリッド自動車や燃料電池車のバックアップ電源用や回生用、あるいは電力貯蔵用等に使用される蓄電ユニットに関するものである。 The present invention relates to a power storage unit used for backup power supply, regeneration, or power storage of various electronic devices, hybrid vehicles, and fuel cell vehicles.
従来から、機器の動作中から停止に移るまでに機器から熱エネルギーなどとして不必要に消費される運動エネルギーを、電気エネルギーとして一旦蓄電素子に貯蔵し、必要な際に再利用することにより、消費されるエネルギーを低減し、効率化することが考えられてきた。 Conventionally, the kinetic energy that is unnecessarily consumed as thermal energy from the device during operation until it stops is temporarily stored as electrical energy in the electricity storage device and reused when necessary. It has been considered to reduce the energy generated and improve the efficiency.
その際に、機器の動作に必要なエネルギーを必要な出力で供給することが出来る蓄電素子を用いた蓄電ユニットが必須となった。その蓄電素子の候補には、大別してキャパシタと蓄電池の2種類があった。 At that time, a power storage unit using a power storage element capable of supplying energy necessary for operation of the device with a required output has become essential. There are two types of storage element candidates: capacitors and storage batteries.
図9は従来の蓄電ユニットの一例を示した分解斜視図である。 FIG. 9 is an exploded perspective view showing an example of a conventional power storage unit.
図9において、この従来の蓄電ユニットは、絶縁部材から構成されたケース100の内部に、仕切り100bによって区切られ形成された収容室100aを複数有している。この収容室100a内に、巻回状でありその巻回軸両端に正極および負極を有するコンデンサ素子101および電解液(図示なし)が収容される。そして、この素子101の正極おおよび負極と金属製の端子板105とが、収容室100a内において電気的に接続されると共に、仕切り100bに形成された連通孔100cを介して端子板105どうしが電気的に接続することにより、他のコンデンサ素子101と電気的に接続している。そして、このケース100の上面を、絶縁部材から成るカバー102が封止し、さらに、このカバー102には各収容室100a内に蓄積されるガスを定期的に外部へ放出する圧力調整弁103が配設されている。 In FIG. 9, this conventional power storage unit has a plurality of storage chambers 100a that are partitioned by a partition 100b inside a case 100 formed of an insulating member. In the storage chamber 100a, a capacitor element 101 having a winding shape and having a positive electrode and a negative electrode at both ends of the winding shaft and an electrolytic solution (not shown) are stored. The positive electrode and the negative electrode of the element 101 and the metal terminal plate 105 are electrically connected in the housing chamber 100a, and the terminal plates 105 are connected to each other through the communication hole 100c formed in the partition 100b. By being electrically connected, the other capacitor element 101 is electrically connected. The upper surface of the case 100 is sealed with a cover 102 made of an insulating member. Further, the cover 102 is provided with a pressure regulating valve 103 that periodically discharges gas accumulated in each storage chamber 100a to the outside. It is arranged.
この構成により、従来の蓄電ユニットは、それぞれのコンデンサ素子101を個々のケース、蓋を使って独立したキャパシタを形成した後に接続部材を用いながら蓄電ユニットを形成する構成と比較して、蓄電ユニット構成に必要な部品点数が低減できるため、生産性向上や小型化によるエネルギー密度向上を図ることができる。 With this configuration, the conventional power storage unit has a power storage unit configuration as compared with a configuration in which each capacitor element 101 is formed using an individual case and a lid and then an independent capacitor is formed and then a connection unit is used to form the power storage unit. Since the number of parts required for the process can be reduced, the productivity can be improved and the energy density can be improved by downsizing.
この従来の蓄電ユニットには他に、仕切り100bに各収容室100aの通気を行う連通孔100cや、ケース100内の複数のコンデンサ素子101の特性ばらつきを抑えるバランス回路104が設けられている。 In addition to this conventional power storage unit, a communication hole 100c that ventilates each storage chamber 100a in the partition 100b and a balance circuit 104 that suppresses variation in characteristics of the plurality of capacitor elements 101 in the case 100 are provided.
なお、この出願の発明に関連する先行技術文献情報としては、例えば、特許文献1が知られている。 As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
確かに、上記構成によって、部品点数低減による生産性の向上を図ることが可能となる。しかし、上記仕切り100bを使った上記蓄電ユニットの場合、個々の蓄電装置が独立して構成された蓄電ユニットに比べて、各収容室内で電解液分解などによって発生するガスをいかに効率的に放出するか、あるいは、他の収容室からの電解液の浸入を防ぐかということが重要であった。 Certainly, the above configuration can improve productivity by reducing the number of parts. However, in the case of the power storage unit using the partition 100b, how efficiently gas generated by electrolytic solution decomposition is released in each storage chamber as compared to a power storage unit in which each power storage device is configured independently. It was also important to prevent the electrolyte from entering from other storage chambers.
これは、この仕切り100bを使った蓄電ユニットは部品点数が減る代わりに、仕切り100bが、単にケース100内の区分けを行うだけでなく、従来の独立したコンデンサのケースの役割を担うためである。 This is because the power storage unit using the partition 100b does not reduce the number of parts, but the partition 100b not only separates the case 100 but also functions as a conventional independent capacitor case.
上記仕切り100bを備えた蓄電ユニットの課題に対し、本発明では、このような課題を解決し、気密性やガス透過性などの信頼性に優れた蓄電ユニットを提供することを目的とする。 With respect to the problem of the power storage unit provided with the partition 100b, an object of the present invention is to solve such a problem and to provide a power storage unit having excellent reliability such as airtightness and gas permeability.
上記課題を解決するために本発明における蓄電ユニットは、隔壁により区切られた複数の収容室を有した有底の外装ケースと、収容室にそれぞれ収容された複数の蓄電素子および電解液と、隔壁を通り前記複数の蓄電素子をそれぞれ電気的に接続する接続部材と、
前記外装ケースを封止する蓋体とを少なくとも備え、隔壁に形成された貫通孔と、この貫通孔を封止するガス透過ゴム体を有することを特徴としている。
In order to solve the above problems, a power storage unit according to the present invention includes a bottomed outer case having a plurality of storage chambers separated by partition walls, a plurality of power storage elements and electrolytes respectively stored in the storage chambers, and partition walls A connecting member for electrically connecting the plurality of power storage elements through
It has at least a lid for sealing the outer case, and has a through hole formed in the partition wall and a gas permeable rubber body for sealing the through hole.
この構成により本発明の蓄電ユニットは、貫通孔を封止するガス透過ゴム体が、付近の収容室内で発生するガスを透過させ、かつ、その貫通孔から電解液が他の収容室あるいは外装ケース外部へ漏液することを防ぐように密封するため、気密性を確保しながら、各収容室間において通気を図ることができ、蓄電ユニットとして信頼性を向上させることができる。 With this configuration, in the power storage unit of the present invention, the gas-permeable rubber body that seals the through-hole allows the gas generated in the nearby storage chamber to pass therethrough, and the electrolyte solution passes through the through-hole to another storage chamber or an outer case. Since sealing is performed so as to prevent leakage to the outside, ventilation can be achieved between the storage chambers while ensuring airtightness, and the reliability of the power storage unit can be improved.
(実施例1)
以下に、図面を用いながら本実施例の蓄電ユニットと請求項1〜4、7、8に記載の発明について説明を行う。
Example 1
Hereinafter, the power storage unit of the present embodiment and the inventions described in claims 1 to 4, 7, and 8 will be described with reference to the drawings.
図1は本実施例の蓄電ユニットを示した分解斜視図である。 FIG. 1 is an exploded perspective view showing a power storage unit of the present embodiment.
図1において、本実施例の蓄電ユニットは、角状のケース1の内部に隔壁1bを複数箇所設け、この隔壁1bによって仕切られた複数の収容室1aを有している。そして、これら各収容室1aにはそれぞれ、充放電を行う素子2および電解液(図示なし)が収容され、これら素子2は、隣接する収容室1aの素子2と電気的に接続するために、金属製の接続部材3と電気的に接続されている。そして各収容室1aを区切る隔壁1bには、隣接する収容室1aどうしを連通させる貫通孔(図示なし)が形成されており、この貫通孔へ、貫通孔を塞ぐように、ガス透過ゴム体4aが付勢された状態で挿入されている(詳細は後述)。このケース1の上方を蓋体5が封止する。そしてこの蓋体5の一部には、その開口端が収容室1aと対向するように排気孔5aが形成されており、この排気孔5aの内部には、排気孔5aを塞ぐように、ガス透過ゴム体4bが配設されている。この排気孔5aの内部には、ガス透過ゴム体4bを係止できるように、例えば階段状などのような内側径が狭まった係止部5bを有している。さらに、排気孔5aのガス透過ゴム体4bを固定するため上面側から、例えば多孔質状のゴム固定具6が排気孔5aへ嵌め込まれている。そして、ケース1において最も外側の収容室1aに収容された素子2と接続された接続部材3はケース1の側壁を貫通して外部端子7と電気的に接合されている。 In FIG. 1, the power storage unit of this embodiment has a plurality of partition walls 1 b provided in a square case 1 and a plurality of storage chambers 1 a partitioned by the partition walls 1 b. Each of the storage chambers 1a stores a charge / discharge element 2 and an electrolyte (not shown), and these elements 2 are electrically connected to the element 2 of the adjacent storage chamber 1a. The metal connection member 3 is electrically connected. The partition wall 1b that separates the storage chambers 1a is formed with a through hole (not shown) that allows the adjacent storage chambers 1a to communicate with each other. The gas permeable rubber body 4a is formed so as to block the through hole. Is inserted in a biased state (details will be described later). A lid 5 seals above the case 1. An exhaust hole 5a is formed in a part of the lid 5 so that the opening end thereof faces the storage chamber 1a. The exhaust hole 5a is filled with a gas so as to close the exhaust hole 5a. A transparent rubber body 4b is provided. Inside the exhaust hole 5a, there is a locking portion 5b having a narrow inner diameter such as a step shape so that the gas permeable rubber body 4b can be locked. Further, for example, a porous rubber fixture 6 is fitted into the exhaust hole 5a from the upper surface side in order to fix the gas permeable rubber body 4b of the exhaust hole 5a. The connection member 3 connected to the element 2 housed in the outermost housing chamber 1 a in the case 1 penetrates the side wall of the case 1 and is electrically joined to the external terminal 7.
図2(a)は本実施例の蓄電ユニットに用いられる素子2と接続部材3を個別に示した分解斜視図であり、図2(b)は同蓄電ユニットに用いられる素子2と接続部材3を接合して示した斜視図である。 FIG. 2A is an exploded perspective view individually showing the element 2 and the connection member 3 used in the electricity storage unit of this embodiment, and FIG. 2B is the element 2 and the connection member 3 used in the electricity storage unit. It is the perspective view which joined and showed.
図3は本実施例における蓄電ユニットに用いられる素子どうしの接続方法を、蓋体を省略して示した上面概略図である。 FIG. 3 is a schematic top view showing a method for connecting elements used in the power storage unit in this embodiment, with the lid omitted.
図2(a)において、本実施例において用いられる素子2は、明確には図示されていないが、対向する一対の端部に正極および負極がそれぞれ一方ずつ形成されている。上記のように電極が構成されるように例えば素子2は、シート状の集電体の両面に電極層を一端辺は集電体が露出するように(集電体露出部)形成した正極および負極を、上記集電体露出部が互いに逆方向に突出するようにずらして対向させ、対向する正極および負極の間にセパレータを介在させた状態で、巻回状にした構成である。上記構成の素子2が複数個、各巻回軸が並列になるようにケース1内に配置されている。なお、本実施例に用いられる素子2は巻回状に限定されず、逆方向に突出した集電体露出部を有する正極と負極を積層した構成であってもよい。 In FIG. 2A, the element 2 used in the present embodiment is not clearly shown, but a positive electrode and a negative electrode are respectively formed at a pair of opposed end portions. For example, the element 2 includes a positive electrode formed with an electrode layer on both sides of a sheet-like current collector so that the current collector is exposed at one end (current collector exposed portion) so that the electrode is configured as described above. In this configuration, the negative electrode is wound so that the current collector exposed portion protrudes in the opposite direction to face each other, and a separator is interposed between the positive electrode and the negative electrode facing each other. A plurality of elements 2 having the above-described configuration are arranged in the case 1 so that the winding axes are in parallel. The element 2 used in this embodiment is not limited to a wound shape, and may have a configuration in which a positive electrode and a negative electrode having a current collector exposed portion protruding in the opposite direction are stacked.
この構成により、巻回した際に、突出した正極および負極の上記集電体露出部がそれぞれ巻回軸方向両端に束となって密集した素子端部2aをそれぞれ形成する。そして、図2(b)において、この略端面である素子端部2aと接続部材3の素子接合部3aをレーザー溶接などにより融着させて接合させることによって、電気的な接続を図っている。 With this configuration, when wound, the above-described current collector exposed portions of the positive electrode and the negative electrode are respectively formed into bundles at both ends in the winding axis direction to form element end portions 2a densely packed. In FIG. 2B, the element end 2a, which is the substantially end face, and the element joint 3a of the connection member 3 are fused and joined by laser welding or the like to achieve electrical connection.
そして、接続部材3の一端部である外部接続部3bは、突起部3cを備え、他の素子2に設けられた接続部材3の外部接続部3bと、2つの素子の間に介在する隔壁1bに形成された切り欠きである中継部(図示なし)に、互いの突起部3cが挿入されて、抵抗溶接などを用いて接合される。 And the external connection part 3b which is one end part of the connection member 3 is provided with the protrusion part 3c, and the partition 1b interposed between the external connection part 3b of the connection member 3 provided in the other element 2, and two elements Each of the protrusions 3c is inserted into a relay portion (not shown) which is a notch formed in and is joined using resistance welding or the like.
上記のように、本実施例における蓄電ユニットは、ケース1を封止する蓋体5と、一つのケース1の中に複数の素子2を隔壁1bにより区切られた収容室1aに収容した構成であり、この蓄電ユニットの隔壁1bに貫通孔を設け、その貫通孔を塞ぐようにガス透過ゴム体4aが配設されている。 As described above, the power storage unit in the present embodiment has a configuration in which a cover 5 that seals the case 1 and a plurality of elements 2 in one case 1 are accommodated in a storage chamber 1a that is partitioned by a partition wall 1b. There is a through hole in the partition wall 1b of the power storage unit, and a gas permeable rubber body 4a is disposed so as to close the through hole.
この構成により、本実施例の蓄電ユニットは、収容室1aごとの電解液の移動を抑制しながら、収容室1a間で、ガス透過ゴム体4aを通じたガスの排気あるいはガスの移動を効率的に行うことができる。これにより、とある収容室1aから他の収容室1aへ電解液が浸入することを抑制することができる。これにより、電解液増減により各素子2内部の電解液含浸の度合いが不均一になり、充放電バランスが崩れることを抑制することができる。 With this configuration, the power storage unit of the present embodiment efficiently exhausts gas or moves gas through the gas-permeable rubber body 4a between the storage chambers 1a while suppressing movement of the electrolyte solution for each storage chamber 1a. It can be carried out. Thereby, it can suppress that electrolyte solution permeates into the other storage chamber 1a from a certain storage chamber 1a. Thereby, the degree of the electrolyte impregnation in each element 2 becomes uneven due to the increase / decrease in the electrolyte, and the charge / discharge balance can be prevented from being lost.
この効果は、例えば各収容室1a間の通気手段として従来から公知の気液分離膜などを用いた構成が考えられるが、これと比較し、既に収容室1aに収容されている電解液に対するガス透過機能の維持性能が優れている。言い換えれば、気液分離膜は一般的にガスを透過し、液体の透過を防ぐ部材であるが、この膜に液体が含浸されると、膜内におけるガスの透過性が劣化し、液体の含浸が進むにつれ、ガスの透過と共に含浸された液体も同時に透過する恐れがある。 For example, a configuration using a conventionally known gas-liquid separation membrane or the like as a ventilation means between the storage chambers 1a can be considered as this effect. Compared with this, the gas for the electrolyte already stored in the storage chamber 1a is considered. Excellent maintenance performance of transmission function. In other words, the gas-liquid separation membrane is a member that generally permeates gas and prevents liquid permeation. However, when this membrane is impregnated with liquid, the gas permeability in the membrane deteriorates and the liquid impregnation is performed. As the gas travels, the impregnated liquid may permeate simultaneously with the permeation of gas.
これに対し、ガス透過ゴム体4a、4bを用いることにより、ガス透過ゴム体4に電解液が付着しても含浸されにくいため、漏液しにくい構成となる。 On the other hand, by using the gas permeable rubber bodies 4a and 4b, the gas permeable rubber body 4 is hardly impregnated even if an electrolytic solution adheres to it.
当然であるが、上記本発明の効果についてガス透過ゴム体4aを用いて説明を行ったが、ガス透過ゴム体4bについても、同様のことが言える。 Naturally, the effect of the present invention has been described using the gas permeable rubber body 4a, but the same can be said for the gas permeable rubber body 4b.
また、本実施例において用いるガス透過ゴム体4aはゴム材であるため、一定の加工性を有し、様々な形状に加工することができる。そのため、下記の実施例2でも言及するが、ガス透過ゴム体4aとそれを支持するケース1、隔壁1b、蓋体5の間において、配設箇所の点で、加工を施して様々な形状の箇所へ適応させて配設でき、蓄電ユニットとして設計自由度が向上するという効果を奏する。 Further, since the gas permeable rubber body 4a used in the present embodiment is a rubber material, it has a certain workability and can be processed into various shapes. Therefore, as described in Example 2 below, the gas permeable rubber body 4a and the case 1, the partition 1b, and the lid 5 that support the gas permeable rubber body 4a are processed at various points in terms of arrangement locations. The power storage unit can be arranged and adapted to the location, and the design flexibility is improved.
本実施例のガス透過ゴム体4a、4bに用いられる材料として、例えばブチルゴム、シリコンゴム、エチレンゴムがある。これら、ガス透過ゴム体4a、4bを使って、本実施例の蓄電ユニットでは、複数の隔壁1bにそれぞれガス透過ゴム体4aを嵌め込み、複数の収容室1a間でガスを移動させ、一つの収容室1aからガス透過ゴム体4bを通じて排気を行う。 Examples of materials used for the gas permeable rubber bodies 4a and 4b of the present embodiment include butyl rubber, silicon rubber, and ethylene rubber. Using the gas permeable rubber bodies 4a and 4b, in the power storage unit of this embodiment, the gas permeable rubber bodies 4a are fitted into the plurality of partition walls 1b, respectively, and the gas is moved between the plurality of storage chambers 1a so Exhaust is performed from the chamber 1a through the gas permeable rubber body 4b.
図4(a)は本実施例における蓄電ユニットのガス透過ゴム体配設箇所を抜粋して示した断面概略図であり、図4(b)は同蓄電ユニットの形状の異なるガス透過ゴム体4aの配設箇所を抜粋して示した断面概略図、図4(c)は同蓄電ユニットの形状の異なるガス透過ゴム体の配設箇所を抜粋して示した断面概略図である。 FIG. 4A is a schematic cross-sectional view showing a gas permeable rubber body arrangement portion of the power storage unit in this embodiment, and FIG. 4B is a gas permeable rubber body 4a having a different shape of the power storage unit. FIG. 4C is a schematic cross-sectional view showing extracted locations of gas permeable rubber bodies having different shapes of the electricity storage unit.
さらに、本実施例では、図4(a)のように、ガス透過ゴム体4aが貫通孔を塞ぐだけの構成に限らず、図4(b)、(c)のようにこのガス透過ゴム体4aの挿入方向両端に通気孔から表出すると共に通気孔の径よりも径が大きい鍔部を備えている構成でもよい。この構成により、上記通気孔においてより強固にガス透過ゴム体4aを固定し、電解液の浸入を効率的に抑制することができる。 Furthermore, in the present embodiment, the gas permeable rubber body is not limited to the configuration in which the gas permeable rubber body 4a only blocks the through-hole as shown in FIG. 4 (a), and the gas permeable rubber body as shown in FIGS. 4 (b) and 4 (c). The structure which is provided with the collar part which has a diameter larger than the diameter of a vent hole while it exposes from a vent hole in the both ends of the insertion direction of 4a. With this configuration, the gas-permeable rubber body 4a can be more firmly fixed in the vent hole, and the infiltration of the electrolytic solution can be efficiently suppressed.
なお、本実施例において、接続部材3どうしを隔壁1bを介して接合させるために、例えばこの接合に用いられる貫通孔(図示なし)が設けられ、この貫通孔に互いの突起部3cを挿入した際、互いの突起部3cの間に隙間が形成されるように素子2の配置および接続部材3の寸法を設計することが好ましい。 In the present embodiment, in order to join the connecting members 3 through the partition wall 1b, for example, a through hole (not shown) used for the joining is provided, and the protrusions 3c are inserted into the through holes. At this time, it is preferable to design the arrangement of the elements 2 and the dimensions of the connection member 3 so that a gap is formed between the protrusions 3c.
これにより、抵抗溶接などを行う際に、上記隙間を埋めるように互いの突起部3cを挟み込んで接合を行い、外部接続部3bの突起部3c以外の部分が、より積極的に隔壁1bの壁面に押圧される。これにより、隔壁1bにおける外部接続部3bとの対向箇所の封止強度が向上する。 Thereby, when performing resistance welding or the like, the protrusions 3c are sandwiched and joined so as to fill the gap, and the portions other than the protrusions 3c of the external connection part 3b are more positively connected to the wall surface of the partition wall 1b. Pressed. Thereby, the sealing strength of the location facing the external connection part 3b in the partition 1b is improved.
また、接続部材3の形状において、図2(a)のように板状の部材を加工したものであれば、素子接合部3aと外部接続部3bの平面部が異なる方向を向いた構成が好ましい。 Further, in the shape of the connection member 3, if the plate-like member is processed as shown in FIG. 2A, a configuration in which the planar portions of the element joint portion 3a and the external connection portion 3b are directed in different directions is preferable. .
これは、図3に記載の矢印のように、外部接続部3bが接合される際に、その外部接続部3bに他方の外部接続部3bへ向かう一定の応力がかかる。その際に、素子接合部3aにもその応力がかかり、その応力は、素子接合部3aと素子端部2aの接合界面に対して張力となる。この張力が大きい場合、上記接合界面で剥離が生じる恐れがあり、上記接合界面での接触抵抗が増大する恐れがある。そのため、この張力の方向を素子2の巻回軸方向からずらし、上記接合界面にかかる張力を低減するために、素子接合部3aと外部接続部3bは異なる方向を向いていることが好ましい。 This is because, as indicated by the arrow in FIG. 3, when the external connection portion 3b is joined, a certain stress is applied to the external connection portion 3b toward the other external connection portion 3b. At that time, the stress is also applied to the element bonding portion 3a, and the stress becomes a tension with respect to the bonding interface between the element bonding portion 3a and the element end portion 2a. When this tension is large, peeling may occur at the bonding interface, and contact resistance at the bonding interface may increase. Therefore, in order to shift the direction of the tension from the winding axis direction of the element 2 and reduce the tension applied to the bonding interface, it is preferable that the element bonding portion 3a and the external connection portion 3b are directed in different directions.
言い換えれば、外部接続部3bどうしの接合界面を含む面と、素子接合部3aと素子端部2aの界面を含む面が異なる方向に位置することが好ましい。 In other words, the surface including the bonding interface between the external connection portions 3b and the surface including the interface between the element bonding portion 3a and the element end 2a are preferably located in different directions.
その一例として、本実施例では、外部接続部3bを素子2の横から接合させている。 As an example, in this embodiment, the external connection portion 3 b is joined from the side of the element 2.
さらに、外部接続部3bと素子接合部3aの間にバッファ部を設け、外部接続部3bの角度変更を容易にして、さらに張力を低減した構成などであっても良い。 Furthermore, a configuration in which a buffer portion is provided between the external connection portion 3b and the element joint portion 3a, the angle of the external connection portion 3b is easily changed, and the tension is further reduced may be employed.
このような接続部材3を用いて複数の素子2を接続し、蓄電ユニットを構成することにより、特に巻回軸方向において長い寸法に設計された素子2を用いても、横に倒してケース内へ収容できるため、低背化させることができ、この蓄電ユニットを電子機器に搭載する際に、載置自由度が高まる。 By connecting a plurality of elements 2 using such a connecting member 3 to form a power storage unit, even if the element 2 designed to have a long dimension particularly in the winding axis direction is used, it is tilted sideways and inside the case. Therefore, it is possible to reduce the height, and the degree of freedom of placement increases when this power storage unit is mounted on an electronic device.
また、ケース1および蓋体5の材料は絶縁材料が好ましく、樹脂などが好ましい。そして、蓋体5とケース1を接合する際、ケース1に一度、蓋体5をケース1上部で支持できるように例えばケース1側壁の内周側に切り欠きを設け、超音波溶着などによって接合を行う。 In addition, the material of the case 1 and the lid 5 is preferably an insulating material, preferably a resin. When the lid 5 and the case 1 are joined, a cutout is provided, for example, on the inner peripheral side of the case 1 side wall so that the lid 5 can be supported by the upper portion of the case 1 and joined by ultrasonic welding or the like. I do.
なお、本実施例では、隔壁1bに対してガス透過ゴム体4aを設ける構成を主として説明を行った。しかし、各収容室1aの一部を構成するケース1の外壁の部分にそれぞれガス透過ゴム体4aを設ける、あるいは、蓋体5の各収容室1aの直上に位置する箇所にそれぞれガス透過ゴム体4bを設けた構成であっても、一定のガス排気効率および漏液防止の効果を向上させることができる。 In addition, in the present Example, the structure which provided the gas permeable rubber body 4a with respect to the partition 1b was mainly demonstrated. However, the gas permeable rubber body 4a is provided on the outer wall portion of the case 1 constituting a part of each storage chamber 1a, or the gas permeable rubber body is provided at a position directly above each storage chamber 1a of the lid 5. Even if it is the structure which provided 4b, the fixed gas exhaust efficiency and the effect of liquid leakage prevention can be improved.
(実施例2)
以下に、図面を用いながら本実施例の蓄電ユニットと請求項5、6に記載の発明について説明を行う。なお、実施例1と同じ構成要素には同じ番号を付与して説明を行う。
(Example 2)
Hereinafter, the power storage unit of the present embodiment and the inventions described in claims 5 and 6 will be described with reference to the drawings. Note that the same components as those in the first embodiment are given the same numbers for explanation.
図5は本実施例の蓄電ユニットの一部を部分的に抜粋して示した正面断面図である。 FIG. 5 is a front sectional view showing a part of the power storage unit of the present embodiment.
図5において、本実施例における蓄電ユニットでは、蓋体5に形成された排気孔10に、この排気孔10を塞ぐようにガス透過ゴム体11が配設されている。本実施例に用いられるガス透過ゴム体11は、外部に表出している面、外出面11bと、ケース1内部と対向する面、内呈面11aの面積の大小関係が、外出面11bより内呈面11aの方が大きい構成となっている。 In FIG. 5, in the power storage unit in the present embodiment, a gas permeable rubber body 11 is disposed in an exhaust hole 10 formed in the lid 5 so as to close the exhaust hole 10. The gas permeable rubber body 11 used in the present embodiment has a surface area that is exposed to the outside, the outside surface 11b, a surface that faces the inside of the case 1, and the area of the inside surface 11a that is smaller than the outside surface 11b. The presentation surface 11a has a larger configuration.
この構成により、ガス透過ゴム体11において、ケース1内部のガス透過側である内呈面11aの面積が、水分浸入側の面である外出面11bの面積より大きくなるため、外部からケース1内へ水分が浸入することを抑制しながらより多くのガスを排気することができる。 With this configuration, in the gas permeable rubber body 11, the area of the inner surface 11 a that is the gas permeable side inside the case 1 is larger than the area of the outer surface 11 b that is the surface on the moisture intrusion side. More gas can be exhausted while preventing moisture from entering.
ここで、本実施例における内呈面11aの面積および外出面11bの面積とは、上記排気孔10の両端に位置するそれぞれ開口部の端辺によって囲われた平面の面積のことを指す。 Here, the area of the inner surface 11a and the area of the outer surface 11b in the present embodiment refer to the area of a plane surrounded by the edges of the openings located at both ends of the exhaust hole 10, respectively.
また、このガス透過ゴム体11は、内呈面11aが少なくとも並設された2つの収容室1aと対向するように配置されている。これにより、一つのガス透過ゴム体11を用いて複数の収容室1aのガスを排気することができる。 In addition, the gas permeable rubber body 11 is disposed so as to face the two storage chambers 1a in which the inner surface 11a is arranged in parallel. Thereby, the gas of the some storage chamber 1a can be exhausted using the one gas permeable rubber body 11. FIG.
そして図5のように、このガス透過ゴム体11の形状を外周面が多段状の断面を有する形状にし、内呈面11a、外出面11bの面積を調整する構成にすることにより、ガス透過ゴム体11の段差の部分で、ガス透過ゴム体11が上方へ移動することを防ぎ、また、複数の収容室1aの排気をしようとすると、少なくとも1枚の隔壁1bと当接するため、この隔壁1bにより、ガス透過ゴム体11が下方に移動することを抑制し、固定することができる。 Then, as shown in FIG. 5, the gas permeable rubber body 11 has a configuration in which the outer peripheral surface has a multi-step cross section and the area of the inner surface 11a and the outer surface 11b is adjusted. The gas permeable rubber body 11 is prevented from moving upward at the level difference portion of the body 11, and when trying to exhaust the plurality of storage chambers 1a, the partition wall 1b comes into contact with at least one partition wall 1b. Therefore, it is possible to suppress and fix the gas permeable rubber body 11 from moving downward.
また、図5のような複雑な形状を有するガス透過部手段としてガス透過ゴム体11を形成することができるのは、本発明のようにガス透過部手段としてゴム材を加工して使用しているためである。 Further, the gas permeable rubber body 11 can be formed as the gas permeable means having a complicated shape as shown in FIG. 5 because the rubber material is processed and used as the gas permeable means as in the present invention. Because it is.
本実施例におけるガス透過ゴム体11および排気孔10の形状は上記の形状に限定されず、面積が小さい上面が蓋体5の外側に位置するように構成された円錐台状や角錐台状であってもよい。 The shapes of the gas permeable rubber body 11 and the exhaust hole 10 in the present embodiment are not limited to the above-described shapes, and are a truncated cone shape or a truncated pyramid shape configured such that the upper surface having a small area is located outside the lid body 5. There may be.
(実施例3)
以下に、図面を用いて本実施例と請求項9、10に記載の発明について説明を行うが、本実施例は下記の内容に限定されない。
(Example 3)
Hereinafter, the present embodiment and the inventions described in claims 9 and 10 will be described with reference to the drawings, but the present embodiment is not limited to the following contents.
図6は本実施例における蓄電ユニットに用いられるケース21および蓋体22の構成を示した断面図である。 FIG. 6 is a cross-sectional view showing the configuration of the case 21 and the lid 22 used in the power storage unit in the present embodiment.
本実施例の蓄電ユニットは、実施例1、2と同じ素子2を用いるが、ケース21と蓋体22の形状が異なり、本実施例のケース21と蓋体22の形状は、これら部材2つを重ねて円筒状の外装体が構成できるように、それぞれ略半円筒状の形状を有する。 The power storage unit of the present embodiment uses the same element 2 as in the first and second embodiments, but the shapes of the case 21 and the lid 22 are different, and the shapes of the case 21 and the lid 22 of the present embodiment are two of these members. Each has a substantially semi-cylindrical shape so that a cylindrical exterior body can be formed by stacking.
図7(a)は本実施例の接続部材23を示した正面図であり、図7(b)は同接続部材の平面図であり、図7(c)は同接続部材23の側面図である。 FIG. 7A is a front view showing the connecting member 23 of this embodiment, FIG. 7B is a plan view of the connecting member, and FIG. 7C is a side view of the connecting member 23. is there.
またこれに伴い、素子2と接続する接続部材23の形状も、円柱状の収容室21aに則して、素子接合部23aが略円板状であり、この素子接合部23aの外周端から延びる外部接続部23bを有する。 Accordingly, the connecting member 23 connected to the element 2 also has a substantially disc-shaped element joining portion 23a in accordance with the cylindrical storage chamber 21a, and extends from the outer peripheral end of the element joining portion 23a. It has an external connection part 23b.
図7(a)〜(c)のように、本実施例の外部接続部23bは、上記素子接合部23aの一端を内側に折り込み、さらにその折り込まれた部分の一端を外向きに折り曲げられた状態で構成されている。この一端を外向きに折り曲げる際に、略線状に設けられる折り目(図示なし)が、上記外部接続部23bにおいて、上記素子接合部23aと素子2の接合界面に対して略鉛直方向に形成されるように折り曲げることが好ましい。 As shown in FIGS. 7A to 7C, in the external connection portion 23b of this embodiment, one end of the element joint portion 23a is folded inward, and one end of the folded portion is folded outward. Consists of states. When the one end is bent outward, a crease (not shown) provided in a substantially linear shape is formed in the external connection portion 23b in a substantially vertical direction with respect to the joint interface between the element joint portion 23a and the element 2. It is preferable to bend the
このように構成することにより、この外部接続部23bの他の外部接続部23b(図示なし)と接合される箇所が水平面どうしを重ねた状態で接合が行えるため、外壁の形状が複雑であるケース21の側壁に形成する貫通孔または切り欠き(図示なし)を小さくすることができる。 In this case, the outer wall 23b has a complicated outer wall shape because the portion to be joined to the other external connection portion 23b (not shown) can be joined in a state where the horizontal surfaces overlap each other. The through-hole or notch (not shown) formed in the side wall of 21 can be made small.
図8(a)は本実施例のケース21の内壁に圧力が加わった状態を示した部分断面図であり、図8(b)は実施例1におけるケース1の内壁に圧力が加わった状態を示した部分断面図である。 FIG. 8A is a partial cross-sectional view showing a state in which pressure is applied to the inner wall of the case 21 of the present embodiment, and FIG. 8B shows a state in which pressure is applied to the inner wall of the case 1 in the first embodiment. It is the fragmentary sectional view shown.
そして、本実施例のケース21および蓋体22が接合され、略円筒体を構成することにより、図8(b)のように、収容室1aにおいてガスが発生した際に、ケース1の場合、その底面にかかるガスの応力は、曲げ応力となり、底面が膨らむということになる、これにより、ケース1は、寸法がズレ、蓋体5との接合部などが剥離をおこす恐れなどがある。また、この曲げ応力に耐性を持たせるために、ケース1の側壁や底面の厚みをより厚くするという方法があるが、この方法の場合、厚みを厚くする分だけ材料コストを多く要すると共に、蓄電ユニットとして、大型化や重量増大を招く恐れがある。 Then, when the case 21 and the lid body 22 of this embodiment are joined to form a substantially cylindrical body, as shown in FIG. 8B, when gas is generated in the housing chamber 1a, The stress of the gas applied to the bottom surface becomes a bending stress, which means that the bottom surface swells. As a result, the case 1 may be misaligned and the joint portion with the lid 5 may be peeled off. Further, in order to provide resistance to this bending stress, there is a method of increasing the thickness of the side wall and the bottom surface of the case 1. In this method, the material cost is increased as much as the thickness is increased. As a unit, there is a risk of increasing the size and weight.
これに対して図8(a)のように、ケース21および蓋体22の内底面または内側面、これらの外表面が曲面状である。言い換えれば、収容室21aは円柱状の空洞を形成し、ケース21は、波状の壁部を有し、円筒状のケースが連なった形状となっている。上記の構成より、ガスが収容室21a内で発生した場合、内周面にかかるガスの応力はケース21において壁面の引っ張り応力となる。そして、このガスの応力は、内周面に対して放射線状にかかることとなるため、それぞれ応力に生じる引っ張り応力が相殺されるため、より薄い壁の厚みにおいて、ガス発生時の内圧上昇による膨れなどに対して優れた耐性を得ることができる。このため、蓄電ユニットとして、信頼性を保ちながら軽量化を図ることができる。 On the other hand, as shown in FIG. 8A, the inner bottom surface or the inner side surface of the case 21 and the lid 22 and the outer surfaces thereof are curved. In other words, the storage chamber 21a forms a columnar cavity, and the case 21 has a wavy wall portion and is formed by connecting cylindrical cases. With the above configuration, when gas is generated in the storage chamber 21 a, the stress of the gas applied to the inner peripheral surface becomes the tensile stress of the wall surface in the case 21. Since the stress of the gas is applied radially to the inner peripheral surface, the tensile stress generated in each stress is canceled out. Therefore, in the thinner wall thickness, the swelling due to the increase in internal pressure at the time of gas generation It is possible to obtain excellent resistance to the above. For this reason, as an electrical storage unit, weight reduction can be achieved, maintaining reliability.
因みに、本実施例で説明した接続部材23は、実施例1、2においても用いることができる。 Incidentally, the connection member 23 described in the present embodiment can also be used in the first and second embodiments.
なお、実施例1、2の蓄電ユニットに用いる素子2として、上記集電体には、例えばアルミニウム、銅、鉄、ニッケル、またはそれらの合金などが挙げられる。また、これら集電体にエッチング処理などを施した構成であっても良い。そして、集電体の束である素子端面2aと接合される接続部材3も同様の材料から構成されていることが好ましい。 In addition, as the element 2 used for the electrical storage unit of Examples 1 and 2, examples of the current collector include aluminum, copper, iron, nickel, and alloys thereof. Moreover, the structure which gave the etching process etc. to these electrical power collectors may be sufficient. And it is preferable that the connection member 3 joined to the element end surface 2a which is a bundle of current collectors is also made of the same material.
上記電極層には、活性炭などの炭素材料が好ましい。また、さらにセルロース類などのバインダや、アセチレンブラックなどの導電助剤などを含んだ構成であってもよい。 The electrode layer is preferably a carbon material such as activated carbon. Further, it may be configured to further contain a binder such as celluloses or a conductive aid such as acetylene black.
上記セパレータには、多孔性で絶縁性である材料が用いられる。多孔性で絶縁性である材料としては、セルロース系の紙、ポリプロピレン、ポリエチレンテレフタレート(PET)、ポリイミドなどが用いられる。 The separator is made of a porous and insulating material. Cellulose paper, polypropylene, polyethylene terephthalate (PET), polyimide, etc. are used as the porous and insulating material.
上記電解液には、溶媒にプロピレンカーボネート、エチレンカーボネート、ジメチルカーボネートなどのカーボネート類やラクトン類などの有機溶媒を少なくとも一種用いることが好ましく、電解質には、テトラエチルアンモニウムテトラフルオロボレート(TEABF4)や、トリエチルメチルアンモニウムテトラフルオロボレート(TEMABF4)、1−エチル−3−メチルイミダゾリウムテトラフルオロボレート(EMIBF4)、1−エチル−2、3−ジメチルイミダゾリウムテトラフルオロボレート(EDMIBF4)、1、2、3−トリメチルイミダゾリウムテトラフルオロボレート(TMIBF4)及び1、3−ジメチルイミダゾリウムテトラフルオロボレート(DMIBF4)やアニオンに上記BF4 -以外にもPF6 -などのフッ素原子を含んだアニオンが好ましい。 In the electrolytic solution, it is preferable to use at least one organic solvent such as carbonates such as propylene carbonate, ethylene carbonate, and dimethyl carbonate and lactones as the solvent, and tetraethylammonium tetrafluoroborate (TEABF 4 ), Triethylmethylammonium tetrafluoroborate (TEMABF 4 ), 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF 4 ), 1-ethyl-2,3-dimethylimidazolium tetrafluoroborate (EDMIBF 4 ), 1, 2 , 3-trimethyl imidazolium tetrafluoroborate (TMIBF 4) and 1,3-dimethyl-imidazolium tetrafluoroborate (DMIBF 4) or anions to the BF 4 - Besides PF 6 - I The preferred anion of containing a fluorine atom.
また、カチオンにリチウムイオンを用い、負極の電極層に含まれる炭素材料に一定量のリチウムイオンを吸蔵させて大幅に負極と正極の電位差が広がった素子2を用いてもよい。その場合、炭素材料には、例えば黒鉛、ソフトカーボン、低温焼成炭素、ハードカーボンなどが挙げられる。 Alternatively, the element 2 may be used in which lithium ions are used as cations and a carbon material contained in the electrode layer of the negative electrode is occluded with a certain amount of lithium ions, so that the potential difference between the negative electrode and the positive electrode is greatly widened. In that case, examples of the carbon material include graphite, soft carbon, low-temperature fired carbon, and hard carbon.
上記素子2を構成する材料は、素子2にキャパシタを用いた蓄電ユニットとして挙げているが、本発明の蓄電ユニットはこれだけに限定されず、リチウム二次電池などの電解液中のイオンと反応する電極層とそれを支持する集電体を備えた蓄電池を素子2に用いた蓄電ユニットにも適用が可能である。 Although the material which comprises the said element 2 is mentioned as the electrical storage unit which used the capacitor for the element 2, the electrical storage unit of this invention is not limited only to this, It reacts with the ion in electrolyte solutions, such as a lithium secondary battery. The present invention can also be applied to a power storage unit in which a storage battery including an electrode layer and a current collector that supports the electrode layer is used for the element 2.
以上のように、本発明の蓄電ユニットは、ケース内を仕切り収容室を形成する隔壁に貫通孔を形成し、その貫通孔を塞ぐように、ガス透過性を有したゴム部材を配設した。これにより、ケース内部における通気、排気を効率的に行うことができると共に、その貫通孔から他の収容室へ電解液が浸入することを抑制することができ、蓄電ユニットとして信頼性が向上できる。 As described above, in the power storage unit of the present invention, the through hole is formed in the partition wall that partitions the inside of the case and forms the accommodation chamber, and the rubber member having gas permeability is disposed so as to close the through hole. Thereby, ventilation | gas_flowing and exhaust_gas | exhaustion inside a case can be performed efficiently, and it can suppress that electrolyte solution penetrate | invades into another storage chamber from the through-hole, and can improve reliability as an electrical storage unit.
本発明の蓄電ユニットは、特にケース内部で発生するガスの排気において信頼性に優れているため、過酷な環境条件での充放電を要求される車載用蓄電装置や、その他電子機器などの蓄電装置として利用することが期待される。 The power storage unit of the present invention is excellent in reliability particularly in exhausting gas generated inside the case, so that the power storage device for in-vehicle use and other electronic devices that are required to be charged / discharged under severe environmental conditions It is expected to be used as
1、21 ケース
1a 収容室
1b 隔壁
2 素子
2a 素子端部
3、23 接続部材
3a、23a 素子接合部
3b、23b 外部接続部
3c 突起部
4a、4b、11 ガス透過ゴム体
5、22 蓋体
5a、10 排気孔
5b 係止部
6 ゴム固定具
7 外部端子
11a 内呈面
11b 外出面
DESCRIPTION OF SYMBOLS 1, 21 Case 1a Storage chamber 1b Partition 2 Element 2a Element end part 3, 23 Connection member 3a, 23a Element junction part 3b, 23b External connection part 3c Protrusion part 4a, 4b, 11 Gas-permeable rubber body 5, 22 Lid 5a DESCRIPTION OF SYMBOLS 10 Exhaust hole 5b Locking part 6 Rubber fixture 7 External terminal 11a Inner surface 11b Outer surface
Claims (10)
複数の前記収容室へそれぞれ、共に収容された蓄電素子および電解液と、
前記複数の蓄電素子をそれぞれ電気的に接続する接続部材と、
前記外装ケースを封止する蓋体とを少なくとも備え、
前記隔壁に貫通孔が設けられ、この貫通孔を封止するガス透過ゴム体が設けられたことを特徴とした蓄電ユニット。 A bottomed outer case having a plurality of storage chambers separated by a partition;
A storage element and an electrolytic solution accommodated together in each of the plurality of storage chambers,
A connection member for electrically connecting the plurality of power storage elements respectively;
And at least a lid for sealing the outer case,
A power storage unit, wherein the partition wall is provided with a through hole, and a gas permeable rubber body for sealing the through hole is provided.
前記素子接合部と前記蓄電素子の界面を含む面と、前記外部接続部と他の接続部材の界面を含む面とが、異なる向きにある請求項1に記載の蓄電ユニット。 The pair of connection members are electrically connected to other connection members through the partition, and element junctions that are electrically connected to positive and negative electrodes formed at a pair of opposing ends of the power storage element, respectively. Each having at least an external connection,
The power storage unit according to claim 1, wherein a surface including an interface between the element joint portion and the power storage element and a surface including an interface between the external connection portion and another connection member are in different directions.
前記外部接続部は、前記素子接合部の一端により構成されると共にこの一端を内側に折り曲げて形成された請求項7に記載の蓄電ユニット。 The connection member connected to at least one of the electricity storage elements is composed of a plate material,
The power storage unit according to claim 7, wherein the external connection portion is configured by one end of the element joint portion and is formed by bending the one end inward.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012227099A (en) * | 2011-04-22 | 2012-11-15 | Primearth Ev Energy Co Ltd | Battery |
KR20170065771A (en) * | 2015-12-04 | 2017-06-14 | 주식회사 엘지화학 | Battery Pack Comprising Battery Modules Having Battery Cells Arranged in Different Directions |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012227099A (en) * | 2011-04-22 | 2012-11-15 | Primearth Ev Energy Co Ltd | Battery |
KR20170065771A (en) * | 2015-12-04 | 2017-06-14 | 주식회사 엘지화학 | Battery Pack Comprising Battery Modules Having Battery Cells Arranged in Different Directions |
KR102092112B1 (en) | 2015-12-04 | 2020-03-23 | 주식회사 엘지화학 | Battery Pack Comprising Battery Modules Having Battery Cells Arranged in Different Directions |
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