JP6720493B2 - Battery pack pressure relief valve - Google Patents

Battery pack pressure relief valve Download PDF

Info

Publication number
JP6720493B2
JP6720493B2 JP2015197276A JP2015197276A JP6720493B2 JP 6720493 B2 JP6720493 B2 JP 6720493B2 JP 2015197276 A JP2015197276 A JP 2015197276A JP 2015197276 A JP2015197276 A JP 2015197276A JP 6720493 B2 JP6720493 B2 JP 6720493B2
Authority
JP
Japan
Prior art keywords
sheet
shaped member
pack case
reinforcing plate
pack
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.)
Active
Application number
JP2015197276A
Other languages
Japanese (ja)
Other versions
JP2017073195A (en
Inventor
鈴木　直人
直人 鈴木
小林　正和
正和 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2015197276A priority Critical patent/JP6720493B2/en
Publication of JP2017073195A publication Critical patent/JP2017073195A/en
Priority to JP2019155141A priority patent/JP6897730B2/en
Application granted granted Critical
Publication of JP6720493B2 publication Critical patent/JP6720493B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

  • Safety Valves (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Battery Mounting, Suspending (AREA)

Description

この発明は、複数のバッテリをパックケース内に収容したバッテリパックの圧力開放弁、特に、電気自動車の動力源となるような比較的大容量のバッテリパックの圧力開放弁に関する。 The present invention relates to a pressure release valve for a battery pack in which a plurality of batteries are housed in a pack case, and more particularly to a pressure release valve for a battery pack having a relatively large capacity that serves as a power source for an electric vehicle.

例えば電気自動車に用いられるバッテリパックは、雨水や塵埃等の内部への進入を防止するために、パックケースが実質的に密閉された状態に構成される。つまり、充放電や温度変化などに伴うパックケース内の圧力変化を回避するために、比較的少量の空気の出入りを許容するいわゆる呼吸孔等を介してパックケース内外が僅かに連通されているものの、基本的にはパックケースが密閉された状態となっている。 For example, a battery pack used for an electric vehicle has a pack case that is substantially sealed in order to prevent rainwater, dust, and the like from entering the inside. In other words, in order to avoid pressure changes inside the pack case due to charging/discharging or temperature changes, the inside and outside of the pack case are slightly communicated with each other through so-called breathing holes that allow a relatively small amount of air to flow in and out. , Basically, the pack case is sealed.

一方、バッテリの内部短絡等によってバッテリパック内部で多量のガスが急激に発生した場合には、バッテリパックの内部圧力を速やかに逃がすことが必要である。特許文献１には、バッテリパックの一部に開口部を設けるとともに、スリット状の破断部を備えた金属製の薄板からなる封止板によってこの開口部を覆ってなる圧力開放弁が開示されている。このものでは、バッテリパック内の圧力が急激に上昇すると、破断部を起点として封止板が破断し、開口部が開放されて、内部のガスの放出が行われる。 On the other hand, when a large amount of gas is suddenly generated inside the battery pack due to an internal short circuit of the battery or the like, it is necessary to quickly release the internal pressure of the battery pack. Patent Document 1 discloses a pressure release valve in which an opening is provided in a part of a battery pack, and the opening is covered with a sealing plate made of a thin metal plate having a slit-shaped break. There is. In this device, when the pressure inside the battery pack rises sharply, the sealing plate is broken starting from the breaking portion, the opening is opened, and the gas inside is released.

特開２０１４−４１８４１号公報JP, 2014-41841, A

高温高圧のガスの急激な噴出やバッテリパック内部での酸化反応の抑制のためには、バッテリからガスが発生し始めた初期の段階つまりバッテリパック内部の圧力が比較的低い段階で圧力開放弁が開放されることが望ましい。このためには、開口部を覆う封止板を例えば薄い金属箔などから形成し、僅かな圧力差で破断するように構成する必要がある。 In order to suppress the sudden ejection of high-temperature and high-pressure gas and the oxidation reaction inside the battery pack, the pressure release valve should be set at the early stage when gas begins to be generated from the battery, that is, at the stage when the pressure inside the battery pack is relatively low. It is desirable to be open. For this purpose, it is necessary to form the sealing plate that covers the opening from, for example, a thin metal foil, and to break the sealing plate with a slight pressure difference.

しかしながら、このように封止板を僅かな圧力差で破断するように強度が低いものとすると、洗車水等の水圧や風圧などによってパックケースの外側から逆方向に僅かな圧力差が作用したときにも封止板が破断ないし変形してしまう懸念が生じ、結果的に、圧力開放の設定圧を十分に低く設定することが困難であった。 However, if the sealing plate has such low strength that it breaks with a slight pressure difference, when a slight pressure difference acts from the outside of the pack case in the opposite direction due to water pressure of car wash water or wind pressure. However, there is a concern that the sealing plate may be broken or deformed, and as a result, it has been difficult to set the set pressure for releasing the pressure sufficiently low.

本発明に係るバッテリパックの圧力開放弁は、
実質的に密閉されたパックケース内に複数のバッテリが収容されてなるバッテリパックにおいて、
上記パックケースの内部空間と外部空間とを連通するように上記パックケースの壁に開口形成された開口部と、
この開口部を覆うように配置され、かつ所定の圧力差によって破断する金属箔からなるシート状部材と、
このシート状部材の内側面に重ねられたパンチングメタルからなる補強板と、
を備え、
上記シート状部材と上記補強板とが、パックケース内部のガス圧力をシート状部材が受けたときに当該シート状部材が剥離可能な接着強度でもって互いに接着されている。 The pressure release valve of the battery pack according to the present invention,
In a battery pack in which a plurality of batteries are housed in a substantially sealed pack case,
An opening formed in the wall of the pack case so as to connect the internal space and the external space of the pack case,
A sheet-like member that is arranged so as to cover this opening and is made of a metal foil that breaks due to a predetermined pressure difference,
A reinforcing plate made of punching metal that is stacked on the inner surface of the sheet-shaped member,
Equipped with
The sheet-shaped member and the reinforcing plate are bonded to each other with an adhesive strength such that the sheet-shaped member can be peeled off when the sheet-shaped member receives the gas pressure inside the pack case.

このような構成では、ガス発生時の圧力差によって破断するシート状部材が、その内側面から補強板でもって支持されるため、逆方向の圧力差によっては変形あるいは破断しない。従って、シート状部材が破断する設定圧を比較的低く設定することが可能となる。ガス発生時には、通気性を有する補強板を通してシート状部材にガス圧力が作用するので、シート状部材が補強板から離れて破断に至る。 In such a configuration, the sheet-shaped member that breaks due to the pressure difference when gas is generated is supported by the reinforcing plate from the inner surface thereof, and therefore does not deform or break due to the pressure difference in the opposite direction. Therefore, it is possible to set the set pressure at which the sheet-shaped member breaks relatively low. At the time of gas generation, gas pressure acts on the sheet-shaped member through the reinforcing plate having air permeability, so that the sheet-shaped member separates from the reinforcing plate and is broken.

本発明によれば、洗車水等の水圧や風圧などによってシート状部材に対しパックケースの外側から逆方向に圧力差が作用したときに、シート状部材の変形や破断が生じることがなく、従って、ガス発生時にシート状部材が破断する設定圧を十分に低く設定することが可能となる。 According to the present invention, when a pressure difference acts on the sheet-shaped member from the outside of the pack case in the opposite direction due to water pressure such as car wash water or wind pressure, the sheet-shaped member is not deformed or fractured. It is possible to set the set pressure at which the sheet-shaped member breaks when gas is generated, sufficiently low.

本発明に係る圧力開放弁を備えた一実施例のバッテリパックの外観斜視図。1 is an external perspective view of a battery pack of an embodiment including a pressure release valve according to the present invention. パックケースアッパを取り除いてバッテリパック内部の構成を示した斜視図。The perspective view which removed the pack case upper and showed the composition inside a battery pack. 圧力開放弁の第１実施例を示すパックケース要部の斜視図。The perspective view of the pack case main part which shows 1st Example of a pressure release valve. パックケースの内側から見た圧力開放弁の平面図。The top view of the pressure relief valve seen from the inside of a pack case. 圧力開放弁の分解斜視図。The disassembled perspective view of a pressure release valve. 圧力開放弁の断面図。Sectional drawing of a pressure release valve. 切り込み刃を付加した変形例を示す斜視図。The perspective view which shows the modification which added the cutting blade. シート状部材に十字形に溝を設けた変形例を示す斜視図。The perspective view which shows the modification which provided the cross-shaped groove|channel in the sheet-shaped member. シート状部材の周囲に円形に溝を設けた変形例を示す斜視図。The perspective view which shows the modification which provided the circular groove in the circumference|surroundings of a sheet-shaped member.

以下、本発明の一実施例を図面に基づいて詳細に説明する。 An embodiment of the present invention will be described below in detail with reference to the drawings.

図１は、本発明を例えば電気自動車用のバッテリパック１に適用した一実施例を示す斜視図である。このバッテリパック１は、略矩形の箱状をなすパックケース２内に多数のバッテリ３（図２参照）を収容したものであって、パックケース２は、下側部分を構成するトレイ状のパックケースロア４と、上側部分を構成するパックケースアッパ５と、から構成されている。パックケースロア４およびパックケースアッパ５は、それぞれ適宜な板厚の鋼板をプレス成形することでトレイ形状に形成されており、周縁部において互いに接合され、かつ図示しないボルト等によって互いに結合されている。両者の接合面は液体ガスケット等の適宜なシール材によってシールされており、これによって、パックケース２内は、外部からの雨水や塵埃等の侵入を防ぐように、実質的に密閉された状態となっている。なお、充放電や温度変化などに伴うパックケース２内の圧力変化を回避するために、例えば図示しない呼吸孔等を介して比較的少量の空気の出入りは許容されている。 FIG. 1 is a perspective view showing an embodiment in which the present invention is applied to a battery pack 1 for an electric vehicle, for example. The battery pack 1 has a large number of batteries 3 (see FIG. 2) housed in a substantially rectangular box-shaped pack case 2, and the pack case 2 is a tray-shaped pack that constitutes a lower portion. It is composed of a case lower 4 and a pack case upper 5 constituting the upper part. The pack case lower 4 and the pack case upper 5 are formed in a tray shape by press-forming steel plates having appropriate plate thicknesses, respectively, and are joined to each other at their peripheral portions and also joined to each other by bolts or the like not shown. .. The joint surface between the two is sealed by a suitable sealing material such as a liquid gasket, so that the inside of the pack case 2 is in a substantially sealed state so as to prevent rainwater, dust and the like from entering from the outside. Has become. In order to avoid a pressure change in the pack case 2 due to charging/discharging or temperature change, for example, a relatively small amount of air is allowed to flow in and out through a breathing hole or the like (not shown).

図２は、パックケースアッパ５を取り除いた状態でバッテリパック１の内部の構成を示している。この実施例においては、各々のバッテリ３は、外装体としてラミネートフィルムでシールされた平坦な形状のリチウムイオンセルを、複数個（例えば４個）重ねて箱状の金属ケース内に収容したバッテリモジュールとして構成されている。偏平な直方体形状をなす複数個のバッテリ３は、パックケース２の長手方向（図中のＹ方向）の一端部においては、いわゆる縦置きに複数個並べて配置されており、パックケース２の残部の領域においては、いわゆる平積み形式に並べて配置されている。パックケース２の長手方向の他端部には、冷却ファン６やジャンクションボックス７等が配置されている。 FIG. 2 shows the internal structure of the battery pack 1 with the pack case upper 5 removed. In this embodiment, each battery 3 is a battery module in which a plurality of (for example, four) flat-shaped lithium ion cells sealed with a laminate film as an exterior body are stacked and housed in a box-shaped metal case. Is configured as. A plurality of batteries 3 having a flat rectangular parallelepiped shape are arranged side by side in a so-called vertical arrangement at one end of the pack case 2 in the longitudinal direction (Y direction in the drawing), and the remaining parts of the pack case 2 are arranged. In the area, they are arranged side by side in a so-called flat-stack form. A cooling fan 6, a junction box 7 and the like are arranged at the other end of the pack case 2 in the longitudinal direction.

図２に明らかなように、バッテリ３を縦置きとした領域では、バッテリ３を平積み形式に並べた領域に比較して、上下方向（図中のＺ方向）の寸法が大きなものとなる。図１に示すように、パックケースアッパ５の天井面は、このようなバッテリ３の配置の凹凸に対応した形状に構成されている。 As is apparent from FIG. 2, in the region where the batteries 3 are vertically placed, the size in the vertical direction (Z direction in the drawing) is larger than that in the region where the batteries 3 are arranged in a flat stacking form. As shown in FIG. 1, the ceiling surface of the pack case upper 5 is formed in a shape corresponding to such unevenness of the arrangement of the batteries 3.

本発明の圧力開放機構１１は、パックケース２の任意の位置に設けることができるが、一実施例においては、パックケースアッパ５の略中央部に圧力開放弁１１が配置されている。 The pressure release mechanism 11 of the present invention can be provided at any position of the pack case 2, but in one embodiment, the pressure release valve 11 is arranged substantially in the center of the pack case upper 5.

図３〜図６は、圧力開放弁１１の第１実施例を示している。この圧力開放弁１１は、パックケース２の内部空間と外部空間とを連通するようにパックケースアッパ５の壁５Ａに開口形成された円形の開口部１２と、この開口部１２を覆うように配置され、かつ所定の圧力差によって破断するシート状部材１３と、このシート状部材１３を内側から補強する通気性を有する補強板１４と、を主体として構成されている。 3 to 6 show a first embodiment of the pressure release valve 11. The pressure release valve 11 is a circular opening 12 formed in the wall 5A of the pack case upper 5 so as to connect the internal space and the external space of the pack case 2, and is arranged so as to cover the opening 12. The sheet-like member 13 that is broken by a predetermined pressure difference and the breathable reinforcing plate 14 that reinforces the sheet-like member 13 from the inside are mainly configured.

上記シート状部材１３は、アルミニウム、銅、ステンレススチール、真鍮、などの金属の箔、ポリエチレン、ポリプロピレン、ナイロン、などの合成樹脂の薄板ないしシート、アルミナ、ジルコニア、などのセラミックスの薄板、などから構成されている。一実施例では、比較的小さな圧力差でもって破断し得るように、厚さが０．０５ｍｍのアルミニウム箔が用いられている。 The sheet-shaped member 13 is composed of a metal foil such as aluminum, copper, stainless steel, or brass, a synthetic resin thin plate or sheet such as polyethylene, polypropylene, or nylon, or a ceramic thin plate such as alumina or zirconia. Has been done. In one embodiment, an aluminum foil with a thickness of 0.05 mm is used so that it can break with a relatively small pressure differential.

上記補強板１４は、アルミニウム、銅、ステンレススチール、などの金属材料、アルミナ、ジルコニア、などのセラミックス材料、ポリエチレン、ポリプロピレン、ナイロン、ポリイミド、ポリフェニレンサルファイドなどの合成樹脂材料、天然繊維、などを用いて、多孔板、網、メッシュ（平織、綾織など）、多孔体、発泡体、多孔質焼結体、などの通気性と適度な剛性とを有する形態に構成したものである。一実施例では、厚さが１ｍｍのステンレススチール板に多数の小孔１４ａを打ち抜き形成したパンチングメタルが用いられている。なお、このパンチングメタルからなる補強板１４は、アルミニウム箔からなるシート状部材１３よりも強度が高く、かつ鋼板からなるパックケースアッパ５の壁５Ａよりは強度が低いものとなる。 The reinforcing plate 14 is made of a metal material such as aluminum, copper or stainless steel, a ceramic material such as alumina or zirconia, a synthetic resin material such as polyethylene, polypropylene, nylon, polyimide or polyphenylene sulfide, or a natural fiber. , Perforated plate, net, mesh (plain weave, twill weave, etc.), porous body, foamed body, porous sintered body, etc., having an air permeability and an appropriate rigidity. In one embodiment, a punching metal in which a large number of small holes 14a are punched and formed in a stainless steel plate having a thickness of 1 mm is used. The reinforcing plate 14 made of punching metal has higher strength than the sheet-shaped member 13 made of aluminum foil, and has lower strength than the wall 5A of the pack case upper 5 made of steel plate.

上記のシート状部材１３および補強板１４は、図５に示すように、それぞれ開口部１２よりも僅かに大きな径の円形に形成されており、補強板１４がシート状部材１３の内側に位置するように互いに重ねられた上で、円環状のフロントプレート１５およびリヤプレート１６を介して壁５Ａの外側面上に固定されている。壁５Ａの外側面と補強板１４周縁部との間には、円環状のシート状をなすゴムパッキング１７が介装され、シート状部材１３周縁部とフロントプレート１５との間には、円環状のゴムパッキング１８が介装されている。壁５Ａの外側に位置するフロントプレート１５と壁５Ａの内側に位置するリヤプレート１６とは、複数本例えば４本のネジ２０によって互いに締結されており、この両者の締付によって、シート状部材１３および補強板１４がゴムパッキング１７，１８とともに挟持されている。ネジ２０は、ゴムパッキング１７の貫通孔２１および壁５Ａの貫通孔２２を貫通し、かつ、リヤプレート１６のネジ孔２３に螺合している。円形をなすシート状部材１３および補強板１４は、４本のネジ２０で囲まれることにより径方向に位置決めされている。 As shown in FIG. 5, the sheet-shaped member 13 and the reinforcing plate 14 are each formed in a circular shape having a diameter slightly larger than the opening 12, and the reinforcing plate 14 is positioned inside the sheet-shaped member 13. As described above, they are stacked on each other and fixed to the outer surface of the wall 5A via the annular front plate 15 and rear plate 16. An annular sheet-shaped rubber packing 17 is interposed between the outer surface of the wall 5A and the peripheral portion of the reinforcing plate 14, and an annular ring is provided between the peripheral portion of the sheet-shaped member 13 and the front plate 15. The rubber packing 18 of FIG. The front plate 15 located outside the wall 5A and the rear plate 16 located inside the wall 5A are fastened to each other by a plurality of, for example, four screws 20, and the sheet-shaped member 13 is fastened by tightening the two. The reinforcing plate 14 is sandwiched between the rubber packings 17 and 18. The screw 20 penetrates the through hole 21 of the rubber packing 17 and the through hole 22 of the wall 5A, and is screwed into the screw hole 23 of the rear plate 16. The circular sheet-shaped member 13 and the reinforcing plate 14 are radially positioned by being surrounded by the four screws 20.

ここで、シート状部材１３と補強板１４とは、単に重ね合わせるだけでもよいが、好ましくは、パックケース２内部のガス圧力を受けたときに容易に剥離し得る比較的弱い接着強度でもって互いに接着しておくとよい。このように互いに接着しておくことで、車両走行振動などに起因した両者間の振動が抑制される。 Here, the sheet-like member 13 and the reinforcing plate 14 may be simply overlapped with each other, but preferably, the sheet-like member 13 and the reinforcing plate 14 are relatively weakly bonded to each other so that they can be easily separated when the gas pressure inside the pack case 2 is received. It is good to glue it. By adhering to each other in this way, vibration between the two caused by vehicle traveling vibration or the like is suppressed.

上記のように構成された圧力開放弁１１においては、セルの内部短絡などによってガスが発生し、パックケース２内の圧力が上昇すると、シート状部材１３が補強板１４から離れて膨張し、やがて破断して開口部１２が開放される。これにより、パックケース２内の高温高圧のガスが放出され、過度の高圧化が回避される。上記実施例では、シート状部材１３の破断が生じる設定圧が比較的低く設定されており、セルからのガスの放出が始まった比較的初期の段階でパックケース２内から内部の空気（つまり酸素）とともにガスを外部へ放出できるので、パックケース２内部での急激な酸化の進行を抑制することができる。 In the pressure relief valve 11 configured as described above, when gas is generated due to an internal short circuit of the cell or the like and the pressure in the pack case 2 rises, the sheet-shaped member 13 separates from the reinforcing plate 14 and expands, and eventually. The opening 12 is opened by breaking. As a result, the high-temperature and high-pressure gas in the pack case 2 is released, and an excessive increase in pressure is avoided. In the above-described embodiment, the set pressure at which the sheet-shaped member 13 breaks is set to be relatively low, and the air (that is, oxygen) inside the pack case 2 is discharged from the inside of the pack case 2 at a relatively early stage when the gas is released from the cell. ) And the gas can be released to the outside, it is possible to suppress the rapid progress of oxidation inside the pack case 2.

ここで、補強板１４は、シート状部材１３の内側面に重ねられているものの、パンチングメタル等として十分な通気性を有しているので、パックケース２内の圧力が補強板１４を通してシート状部材１３に確実に作用する。なお、補強板１４の強度はパックケース２の壁５Ａの強度よりは低いので、圧力上昇の程度が急激な場合には、シート状部材１３が破断した後に、パックケース２内の圧力によってさらに補強板１４が破断することもあり得る。 Here, although the reinforcing plate 14 is laminated on the inner surface of the sheet-shaped member 13, since it has sufficient air permeability as punching metal or the like, the pressure inside the pack case 2 passes through the reinforcing plate 14 to form a sheet shape. It surely acts on the member 13. Since the strength of the reinforcing plate 14 is lower than the strength of the wall 5A of the pack case 2, when the pressure rise is rapid, the pressure inside the pack case 2 is further reinforced after the sheet-shaped member 13 is broken. It is possible for the plate 14 to break.

一方、通常の使用時には、シート状部材１３が補強板１４によって内側から支持されているため、パックケース２の外側から例えば洗車水が衝突したり大きな風圧が作用したとしても、シート状部材１３の内側への変形が抑制され、破断に至ることがない。 On the other hand, during normal use, the sheet-shaped member 13 is supported from the inside by the reinforcing plate 14. Therefore, even if car wash water collides from the outside of the pack case 2 or a large wind pressure acts, the sheet-shaped member 13 is not supported. Inward deformation is suppressed, and it does not break.

なお、上記実施例のパンチングメタルの場合、補強板１４に開口形成される多数の小孔１４ａの径は、外側からの圧力に対してシート状部材１３が破断しない耐圧性の観点から、その最大径が定まる。例えば、シート状部材１３が前述した厚さ０．０５ｍｍのアルミニウム箔であれば、シート状部材１３が破断しないために必要な耐圧性を３．２ｋＰａとしたときに、最大径が約１５ｍｍとなる。従って、パンチングメタルからなる補強板１４の小孔１４ａの径を１５ｍｍよりも小さいものとすれば、外側から加わる３．２ｋＰａの圧力に耐えることができる。 In the case of the punching metal of the above-mentioned embodiment, the diameter of the large number of small holes 14a formed in the reinforcing plate 14 is the maximum from the viewpoint of pressure resistance so that the sheet-like member 13 does not break against pressure from the outside. The diameter is fixed. For example, if the sheet-shaped member 13 is the above-mentioned aluminum foil having a thickness of 0.05 mm, the maximum diameter is about 15 mm when the pressure resistance required to prevent the sheet-shaped member 13 from breaking is 3.2 kPa. .. Therefore, if the diameter of the small hole 14a of the reinforcing plate 14 made of punching metal is smaller than 15 mm, it is possible to withstand a pressure of 3.2 kPa applied from the outside.

次に、図７は、シート状部材１３の周縁部の表面に対向して切り込み刃３１を付加した変形例を示している。切り込み刃３１は、帯状金属片を略Ｌ字形に折り曲げ、先端に略三角形の鋭端部３１ａを形成したものであり、圧力開放弁１１を組み立てる前述のネジ２０の１本を利用して、フロントプレート１５の上に重ねて固定されている。鋭端部３１ａは、シート状部材１３の周縁部の表面に対向して位置しており、初期状態では、シート状部材１３の表面に接触しないものの十分に接近した状態となっている。 Next, FIG. 7 shows a modified example in which a cutting blade 31 is added so as to face the surface of the peripheral portion of the sheet-shaped member 13. The cutting blade 31 is formed by bending a strip-shaped metal piece into a substantially L-shape and forming a substantially triangular sharp end portion 31a at the tip, and using one of the above-mentioned screws 20 for assembling the pressure release valve 11, The plate 15 is overlapped and fixed on the plate 15. The sharp end portion 31a is positioned so as to face the surface of the peripheral edge portion of the sheet-shaped member 13, and in the initial state, the sharp end portion 31a does not contact the surface of the sheet-shaped member 13, but is sufficiently close.

この実施例においては、パックケース２内の圧力が上昇してシート状部材１３が外側に僅かに膨らんだ段階において、該シート状部材１３が鋭端部３１ａに接触する。これにより、鋭端部３１ａを起点としてシート状部材１３の破断が生じる。従って、所望の圧力においてより確実にシート状部材１３の破断つまりは圧力開放弁１１の開放動作を生じさせることができる。特に、圧力が上昇し始めてからシート状部材１３が破断するまでの遅れが小さくなる。 In this embodiment, when the pressure inside the pack case 2 rises and the sheet-shaped member 13 slightly bulges outward, the sheet-shaped member 13 contacts the sharp end 31a. As a result, the sheet-shaped member 13 is fractured starting from the sharp end 31a. Therefore, the breakage of the sheet-like member 13, that is, the opening operation of the pressure release valve 11 can be caused more reliably at a desired pressure. In particular, the delay from when the pressure starts to rise until the sheet member 13 breaks becomes small.

次に、図８および図９は、シート状部材１３の一部に破断を促進する脆弱部を設けた例を示している。図８の例では、シート状部材１３の表面に、脆弱部となる凹溝３５が十字形に形成されている。図９の例では、シート状部材１３の表面に、脆弱部となる凹溝３６がゴムパッキング１８の内周に沿って円形に形成されている。 Next, FIGS. 8 and 9 show an example in which a fragile portion that promotes breakage is provided in a part of the sheet-shaped member 13. In the example of FIG. 8, the groove 35, which is a fragile portion, is formed in a cross shape on the surface of the sheet-shaped member 13. In the example of FIG. 9, a concave groove 36, which is a fragile portion, is formed on the surface of the sheet-like member 13 in a circular shape along the inner circumference of the rubber packing 18.

この実施例においては、パックケース２内の圧力が上昇してシート状部材１３が外側に僅かに膨らんだ段階において、脆弱部である凹溝３５，３６を起点としてシート状部材１３の破断が生じる。従って、図７の実施例と同様に、所望の圧力においてより確実にシート状部材１３の破断つまりは圧力開放弁１１の開放動作を生じさせることができる。特に、圧力が上昇し始めてからシート状部材１３が破断するまでの遅れが小さくなる。 In this embodiment, at the stage where the pressure inside the pack case 2 rises and the sheet-shaped member 13 slightly bulges outward, the sheet-shaped member 13 is fractured starting from the concave grooves 35 and 36 which are weak portions. .. Therefore, similarly to the embodiment of FIG. 7, it is possible to more reliably cause the breakage of the sheet-like member 13, that is, the opening operation of the pressure release valve 11 at a desired pressure. In particular, the delay from when the pressure starts to rise until the sheet member 13 breaks becomes small.

なお、脆弱部としては、線状に連続したものでなくともよく、点線のように並んで配置した点状のもの、あるいは離散配置した点状のもの、などであってもよい。 The fragile portion does not have to be linear and continuous, but may be dot-like parts arranged side by side as shown by dotted lines or dot-like parts arranged discretely.

また、上記のように構成される圧力開放弁１１をパックケース２に複数個設けることも可能である。 It is also possible to provide a plurality of pressure relief valve 11 that will be configured as described above in the pack case 2.

２…パックケース
５…パックケースアッパ
５Ａ…壁
１１…圧力開放弁
１２…開口部
１３…シート状部材
１４…補強板
３１…切り込み刃
３５，３６…凹溝
５１…小孔
５３…シート状部材 2... Pack case 5... Pack case upper 5A... Wall 11... Pressure release valve 12... Opening portion 13... Sheet-shaped member 14... Reinforcing plate 31... Cutting blades 35, 36... Recessed groove 51... Small hole 53... Sheet-shaped member

Claims (3)

実質的に密閉されたパックケース内に複数のバッテリが収容されてなるバッテリパックにおいて、
上記パックケースの内部空間と外部空間とを連通するように上記パックケースの壁に開口形成された開口部と、
この開口部を覆うように配置され、かつ所定の圧力差によって破断する金属箔からなるシート状部材と、
このシート状部材の内側面に重ねられたパンチングメタルからなる補強板と、
を備え、
上記シート状部材と上記補強板とが、パックケース内部のガス圧力をシート状部材が受けたときに当該シート状部材が剥離可能な接着強度でもって互いに接着されている、バッテリパックの圧力開放弁。 In a battery pack in which a plurality of batteries are housed in a substantially sealed pack case,
An opening formed in the wall of the pack case so as to connect the internal space and the external space of the pack case,
A sheet-like member that is arranged so as to cover this opening and is made of a metal foil that breaks due to a predetermined pressure difference,
A reinforcing plate made of punching metal that is stacked on the inner surface of the sheet-shaped member,
Equipped with
A pressure release valve for a battery pack , wherein the sheet-shaped member and the reinforcing plate are adhered to each other with an adhesive strength capable of peeling the sheet-shaped member when the gas pressure inside the pack case is received by the sheet-shaped member. .. 実質的に密閉されたパックケース内に複数のバッテリが収容されてなるバッテリパックにおいて、In a battery pack in which a plurality of batteries are housed in a substantially sealed pack case,
上記パックケースの内部空間と外部空間とを連通するように上記パックケースの壁に開口形成された開口部と、 An opening formed in the wall of the pack case so as to connect the internal space and the external space of the pack case,
この開口部を覆うように配置され、かつ所定の圧力差によって破断する金属箔からなるシート状部材と、 A sheet-like member that is arranged so as to cover this opening and is made of a metal foil that breaks due to a predetermined pressure difference,
このシート状部材の内側面に重ねられたパンチングメタルからなる補強板と、 A reinforcing plate made of punching metal that is stacked on the inner surface of the sheet-shaped member,
を備え、 Equipped with
上記シート状部材と上記補強板とが、パックケース内部のガス圧力をシート状部材が受けたときに当該シート状部材が剥離可能な接着強度でもって互いに接着されており、 The sheet-shaped member and the reinforcing plate are bonded to each other with an adhesive strength such that the sheet-shaped member can be peeled off when the sheet-shaped member receives the gas pressure inside the pack case,
この互いに接着されたシート状部材および補強板が、２つのゴムパッキングとともに上記パックケースの壁の外側面と環状プレートとの間に挟持されて固定されている、バッテリパックの圧力開放弁。 A pressure release valve for a battery pack, in which the sheet-shaped member and the reinforcing plate, which are adhered to each other, are sandwiched and fixed between the outer surface of the wall of the pack case and the annular plate together with the two rubber packings. 実質的に密閉されたパックケース内に複数のバッテリが収容されてなるバッテリパックにおいて、
上記パックケースの内部空間と外部空間とを連通するように上記パックケースの壁に開口形成された開口部と、
この開口部を覆うように配置され、かつ所定の圧力差によって破断する金属箔からなるシート状部材と、
このシート状部材の内側面に重ねられたパンチングメタルからなる補強板と、
を備え、
上記シート状部材と上記補強板とが、パックケース内部のガス圧力をシート状部材が受けたときに当該シート状部材が剥離可能な接着強度でもって互いに接着されており、
上記補強板は、上記シート状部材よりも強度が高く、かつ上記バッテリパックの上記壁よりも強度が低い、バッテリパックの圧力開放弁。 In a battery pack in which a plurality of batteries are housed in a substantially sealed pack case,
An opening formed in the wall of the pack case so as to connect the internal space and the external space of the pack case,
A sheet-like member that is arranged so as to cover this opening and is made of a metal foil that breaks due to a predetermined pressure difference,
A reinforcing plate made of punching metal that is stacked on the inner surface of the sheet-shaped member,
Equipped with
The sheet-shaped member and the reinforcing plate are bonded to each other with an adhesive strength such that the sheet-shaped member can be peeled off when the sheet-shaped member receives the gas pressure inside the pack case,
The reinforcing plate has strength greater than the sheet-like member, and a lower strength than the wall of the battery pack, the pressure release valve Bas Tteripakku.
JP2015197276A 2015-10-05 2015-10-05 Battery pack pressure relief valve Active JP6720493B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2015197276A JP6720493B2 (en) 2015-10-05 2015-10-05 Battery pack pressure relief valve
JP2019155141A JP6897730B2 (en) 2015-10-05 2019-08-28 Battery pack pressure release valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015197276A JP6720493B2 (en) 2015-10-05 2015-10-05 Battery pack pressure relief valve

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2019155141A Division JP6897730B2 (en) 2015-10-05 2019-08-28 Battery pack pressure release valve

Publications (2)

Publication Number Publication Date
JP2017073195A JP2017073195A (en) 2017-04-13
JP6720493B2 true JP6720493B2 (en) 2020-07-08

Family

ID=58537360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015197276A Active JP6720493B2 (en) 2015-10-05 2015-10-05 Battery pack pressure relief valve

Country Status (1)

Country Link
JP (1) JP6720493B2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107035900B (en) * 2017-05-03 2023-05-12 惠州市沃瑞科技有限公司 Be applied to and open balanced explosion-proof valve of power failure source
KR101923169B1 (en) * 2017-10-20 2019-02-27 에프디씨 주식회사 A rupture disc assembly for vehicle
CN108511661B (en) * 2018-05-04 2020-12-04 安徽上造智能设备科技有限公司 Battery packaging explosion-proof device for electric vehicle
DE102018119144A1 (en) * 2018-08-07 2020-02-13 R. Stahl Schaltgeräte GmbH Pressure relief device and housing with such
JP7379812B2 (en) * 2018-10-01 2023-11-15 大日本印刷株式会社 Valve structure, container including the same, and electricity storage device with valve structure
JP7236653B2 (en) * 2019-02-26 2023-03-10 パナソニックＩｐマネジメント株式会社 battery unit
JP7059226B2 (en) 2019-05-29 2022-04-25 株式会社ニフコ Pressure release valve for battery pack
WO2021253354A1 (en) * 2020-06-18 2021-12-23 东莞新能安科技有限公司 Explosion-proof valve, battery set shell with explosion-proof valve, and battery set
WO2022006900A1 (en) * 2020-07-10 2022-01-13 宁德时代新能源科技股份有限公司 Pressure relief mechanism, battery box, battery cell, battery, preparation method and device
CN116250128A (en) * 2021-02-09 2023-06-09 宁德时代新能源科技股份有限公司 Battery cell, battery, electricity utilization device and method for preparing battery cell
CN221102323U (en) * 2021-03-26 2024-06-07 江苏时代新能源科技有限公司 Battery cell, battery, power utilization device and manufacturing equipment
EP4120448B1 (en) * 2021-06-01 2024-05-22 Contemporary Amperex Technology Co., Limited End cover assembly, battery cell, battery and power-consuming apparatus
WO2023183109A1 (en) * 2022-03-25 2023-09-28 Tyco Fire Products Lp Battery pack with condition-sensitive membranes
CN114678651B (en) * 2022-04-14 2024-04-19 北京科易动力科技有限公司 Explosion-proof valve and battery pack with same
CN114744361B (en) * 2022-04-14 2024-04-19 北京科易动力科技有限公司 Ejector pin type explosion-proof valve and battery pack with same
CN117810641A (en) * 2024-02-28 2024-04-02 宁德新能源科技有限公司 Battery core and electricity utilization device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0935703A (en) * 1995-07-14 1997-02-07 Denso Corp Safety mechanism of battery
JP3494607B2 (en) * 1999-01-28 2004-02-09 日本碍子株式会社 Lithium secondary battery
JP4195306B2 (en) * 2003-01-09 2008-12-10 株式会社オプトニクス精密 Electrochemical element
JP5535969B2 (en) * 2011-03-09 2014-07-02 三菱重工業株式会社 Secondary battery
JP2013254660A (en) * 2012-06-07 2013-12-19 Toyota Industries Corp Power storage device
CN103474599B (en) * 2013-09-15 2018-08-31 宁德新能源科技有限公司 Lithium ion battery with desired Safety performance and battery pack
KR20150061200A (en) * 2013-11-27 2015-06-04 삼성에스디아이 주식회사 Secondary battery
JP2015164111A (en) * 2014-02-28 2015-09-10 株式会社豊田自動織機 power storage device

Also Published As

Publication number Publication date
JP2017073195A (en) 2017-04-13

Similar Documents

Publication Publication Date Title
JP6720493B2 (en) Battery pack pressure relief valve
JP5966922B2 (en) Electricity storage element
JP6376273B2 (en) Power supply
CN109428028B (en) Electricity storage module
EP3361526B1 (en) Pressure release mechanism for battery pack
JP2021523528A (en) A battery module having a structure that can prevent the inflow of air into the module when a thermal runaway phenomenon occurs, and a battery pack containing the battery module.
JP2014060165A (en) Battery case and battery pack
JP5597740B2 (en) Battery module
JP2007141778A (en) Battery and battery pack
WO2013122005A1 (en) Battery fire-prevention apparatus
JP6897730B2 (en) Battery pack pressure release valve
EP2573836B1 (en) Battery unit
KR20150139938A (en) Safety-device-fitted electrochemical device and safety device for electrochemical device
CN103972429B (en) Battery unit with expansion explosion region
JP4069565B2 (en) Sealed battery
JP2005235531A (en) Sealed battery
JP5530882B2 (en) Battery pack
JP2018018614A (en) Battery pack
JP2015164111A (en) power storage device
JP2009021171A (en) Label wound battery pack
JP2016201368A (en) Electricity storage element
JP6438171B2 (en) Blister pack for button battery
WO2023190646A1 (en) Partitioning member and battery assembly
JP6686788B2 (en) Battery pack
JP2023532678A (en) Pouch type battery cell including sealing part venting adjustment means

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180827

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20190702

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190828

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20191029

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200519

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200601

R151 Written notification of patent or utility model registration

Ref document number: 6720493

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151