JP2019175552A - Secondary battery module and secondary battery pack - Google Patents

Secondary battery module and secondary battery pack Download PDF

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JP2019175552A
JP2019175552A JP2018058860A JP2018058860A JP2019175552A JP 2019175552 A JP2019175552 A JP 2019175552A JP 2018058860 A JP2018058860 A JP 2018058860A JP 2018058860 A JP2018058860 A JP 2018058860A JP 2019175552 A JP2019175552 A JP 2019175552A
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secondary battery
battery cell
battery module
pack
exterior member
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崇 藤間
Takashi Fujima
崇 藤間
内田 仁
Hitoshi Uchida
仁 内田
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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

Abstract

To provide a secondary battery module and a secondary battery pack that can suppress fluctuations in output performance and can be reduced in size and weight.SOLUTION: A secondary battery module 20 including a secondary battery cell 30 having an electrode body in which a positive electrode and a negative electrode are laminated via a separator, and a battery exterior member (case) that houses the electrode body together with a non-aqueous electrolyte includes a decompression mechanism 200 that depressurizes the inside of the secondary battery cell 30.SELECTED DRAWING: Figure 5

Description

本発明は、例えば、自動車等の車両に搭載され、電極体と非水電解質とが電池外装部材(ケース)内に収容された二次電池セルを備える二次電池モジュールおよび二次電池パックに関する。   The present invention relates to a secondary battery module and a secondary battery pack that are mounted on a vehicle such as an automobile and that include a secondary battery cell in which an electrode body and a nonaqueous electrolyte are housed in a battery exterior member (case).

従来、例えば、携帯電話やパーソナルコンピュータ等の比較的小型の電子機器用の二次電池(二次電池モジュール又は二次電池パック)として、ニッケル水素二次電池やリチウムイオン二次電池に代表される非水電解質二次電池等が知られている。また近年は、電気自動車等の各種車両に搭載される大型の二次電池の開発も進んでいる。   Conventionally, for example, as a secondary battery (secondary battery module or secondary battery pack) for a relatively small electronic device such as a mobile phone or a personal computer, a nickel metal hydride secondary battery or a lithium ion secondary battery is representative. Nonaqueous electrolyte secondary batteries and the like are known. In recent years, development of large-sized secondary batteries mounted on various vehicles such as electric vehicles has been progressing.

このような二次電池が備える二次電池セルの構造としては、例えば、正極板と負極板とがセパレータを介して積層された電極体が非水電解液と共に電池外装部材(ケース)内に収納され、電池外装部材(ケース)が蓋(封止)部材によって密閉されたものがある。また近年は、非水電解液を固体電解質層に代えて二次電池を固体化した、いわゆる全固体電池も開発されている。   As a structure of the secondary battery cell provided in such a secondary battery, for example, an electrode body in which a positive electrode plate and a negative electrode plate are laminated via a separator is housed in a battery exterior member (case) together with a non-aqueous electrolyte. Some battery exterior members (cases) are sealed with a lid (sealing) member. In recent years, a so-called all-solid battery in which the secondary battery is solidified by replacing the non-aqueous electrolyte with a solid electrolyte layer has been developed.

ところで、このような構造の二次電池セルにおいては、充放電時の体積変化やガスの発生に伴う正極・負極間の距離の増減の影響により、二次電池セルの出力性能が変動したり、寿命が短くなるといった問題が生じる虞がある。   By the way, in the secondary battery cell of such a structure, the output performance of the secondary battery cell fluctuates due to the volume change at the time of charge and discharge and the influence of increase / decrease in the distance between the positive electrode and the negative electrode due to gas generation, There is a possibility that problems such as a shortened life may occur.

このような問題を解決するために、二次電池を構成する二次電池セルを拘束して、正極・負極間の距離の増減を抑制するようにしたものがある。例えば、単一または複数の二次電池セルを所定の拘束治具によって拘束し、二次電池セルの平面に任意の拘束圧を印加するようにしたものがある(特許文献1参照)。   In order to solve such a problem, there is a battery in which a secondary battery cell constituting a secondary battery is restrained to suppress an increase or decrease in the distance between the positive electrode and the negative electrode. For example, there is one in which a single or a plurality of secondary battery cells are constrained by a predetermined restraining jig and an arbitrary restraining pressure is applied to the plane of the secondary battery cell (see Patent Document 1).

国際公開第2013/121563号公報International Publication No. 2013/121563

このように拘束治具によって二次電池セルを拘束することで、二次電池セルの膨張を抑制することができる。したがって、内部に収容されている正極・負極間の距離の増減が抑制され、二次電池セルの出力性能の変動等といった問題の発生も抑えられる。   Thus, by restraining the secondary battery cell by the restraining jig, the expansion of the secondary battery cell can be suppressed. Therefore, increase / decrease in the distance between the positive electrode and the negative electrode accommodated in the inside is suppressed, and the occurrence of problems such as fluctuations in the output performance of the secondary battery cell can be suppressed.

しかしながら、二次電池セルを拘束治具によって拘束すると、二次電池モジュール及び二次電池パックが大型化し、重量も増加してしまうという問題がある。例えば、車両用の二次電池モジュール及び二次電池パックは多数の二次電池セルを備えているため、全ての二次電池セルを拘束治具によって拘束しようとすると、拘束治具を大型化する必要性が生じ、それに伴い二次電池パックが大型化し、重量も増加してしまう。   However, when the secondary battery cell is restrained by the restraining jig, there is a problem that the secondary battery module and the secondary battery pack are increased in size and weight. For example, since a secondary battery module and a secondary battery pack for a vehicle include a large number of secondary battery cells, if all the secondary battery cells are to be restrained by a restraining jig, the restraining jig is enlarged. The necessity arises, and accordingly, the secondary battery pack is increased in size and weight.

本発明は、このような事情に鑑みてなされたものであり、出力性能の変動を抑制することができると共に、小型・軽量化を図ることができる二次電池モジュール及び二次電池パックを提供することを目的とする。   The present invention has been made in view of such circumstances, and provides a secondary battery module and a secondary battery pack that can suppress fluctuations in output performance and can be reduced in size and weight. For the purpose.

上記課題を解決する本発明の一つの態様は、正極と負極とがセパレータを介して積層された電極体と、前記電極体を非水電解質と共に収容する電池外装部材(ケース)と、を有する二次電池セルを備えた二次電池モジュールであって、前記二次電池セルの前記電池外装部材(ケース)内を減圧させる減圧機構を備えていることを特徴とする二次電池モジュールにある。   One aspect of the present invention that solves the above problems includes an electrode body in which a positive electrode and a negative electrode are laminated via a separator, and a battery exterior member (case) that houses the electrode body together with a nonaqueous electrolyte. A secondary battery module including a secondary battery cell, wherein the secondary battery module includes a decompression mechanism that decompresses the inside of the battery exterior member (case) of the secondary battery cell.

ここで、前記減圧機構は、前記電池外装部材(ケース)に接続される排気通路部材と、該排気通路部材に設けられ前記電池外装部材(ケース)内を排気して減圧させる真空ポンプと、を含むことが好ましい。   Here, the decompression mechanism includes: an exhaust passage member connected to the battery exterior member (case); and a vacuum pump provided in the exhaust passage member to exhaust and decompress the interior of the battery exterior member (case). It is preferable to include.

さらに、二次電池モジュールが前記二次電池セルを複数個備えている場合、前記排気通路部材は、各二次電池セルの前記電池外装部材(ケース)に接続される個別通路部と、各個別通路部が接続される共通通路部と、を含み、前記真空ポンプは、各個別通路部が接続される前記共通通路部の接続部よりも下流側に配置されていることが好ましい。   Furthermore, when the secondary battery module includes a plurality of the secondary battery cells, the exhaust passage member includes an individual passage portion connected to the battery exterior member (case) of each secondary battery cell, and each individual It is preferable that the vacuum pump is disposed downstream of the connection portion of the common passage portion to which each individual passage portion is connected.

また前記排気通路部材には、前記二次電池セル内への排気の逆流を防止する逆止弁が設けられていることが好ましい。   Moreover, it is preferable that the exhaust passage member is provided with a check valve for preventing a backflow of exhaust gas into the secondary battery cell.

また本発明の他の態様は、上記のような二次電池モジュールを備えることを特徴とする二次電池パックにある。   Another aspect of the present invention is a secondary battery pack comprising the secondary battery module as described above.

さらに本発明の他の態様は、正極と負極とがセパレータを介して積層された電極体と、前記電極体を非水電解質と共に収容する電池外装部材と、を有する二次電池セルを備えた二次電池パックであって、前記二次電池セル内を減圧させる減圧機構を備えていることを特徴とする二次電池パックにある。   Furthermore, another aspect of the present invention provides a secondary battery cell comprising a secondary battery cell having an electrode body in which a positive electrode and a negative electrode are laminated via a separator, and a battery exterior member that houses the electrode body together with a nonaqueous electrolyte. The secondary battery pack is provided with a decompression mechanism for decompressing the inside of the secondary battery cell.

かかる本発明によれば、拘束治具によって二次電池セルを拘束することなく、電池外装部材(ケース)内に収容されている電極体を適切に拘束することができる。したがって、出力性能の変動を抑制することができると共に、二次電池モジュール及び二次電池パックの小型・軽量化を図ることができる。   According to the present invention, the electrode body accommodated in the battery exterior member (case) can be appropriately restrained without restraining the secondary battery cell by the restraining jig. Therefore, fluctuations in output performance can be suppressed, and the secondary battery module and the secondary battery pack can be reduced in size and weight.

また拘束治具が必要となった場合でも、拘束治具の簡素化を図ることができる。したがって、この場合でも、二次電池モジュール及び二次電池パックの小型・軽量化を図ることができる。   Even when a restraining jig is required, the restraining jig can be simplified. Therefore, even in this case, the secondary battery module and the secondary battery pack can be reduced in size and weight.

本発明に係る二次電池パックの使用態様の一例を示す図である。It is a figure which shows an example of the usage condition of the secondary battery pack which concerns on this invention. 本発明に係る二次電池パックの概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the secondary battery pack which concerns on this invention. 本発明に係る二次電池モジュールの概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the secondary battery module which concerns on this invention. 本発明に係る二次電池セルの内部構造を説明する図である。It is a figure explaining the internal structure of the secondary battery cell which concerns on this invention. 本発明の実施形態1に係る二次電池モジュールの概略構成を説明する図である。It is a figure explaining schematic structure of the secondary battery module concerning Embodiment 1 of the present invention. 本発明の実施形態2に係る二次電池パックの概略構成を示すブロック図である。It is a block diagram which shows schematic structure of the secondary battery pack which concerns on Embodiment 2 of this invention. 本発明の実施形態2に係る二次電池パックの動作を説明するフローチャートである。6 is a flowchart illustrating an operation of a secondary battery pack according to Embodiment 2 of the present invention.

以下、本発明の実施形態について図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(実施形態1)
図1に示す車両1は、例えば、電気自動車やハイブリッド車両等の電動車両であり、図示しないモータに電力を供給するための二次電池パック10が搭載されている。
(Embodiment 1)
A vehicle 1 shown in FIG. 1 is an electric vehicle such as an electric vehicle or a hybrid vehicle, for example, and is mounted with a secondary battery pack 10 for supplying electric power to a motor (not shown).

二次電池パック10は、図2に示すように、パックトレイ11及びパックカバー12とで構成されるパック外装ケース13と、このパック外装ケース13内に収容される二次電池モジュール20と、を備えている。   As shown in FIG. 2, the secondary battery pack 10 includes a pack outer case 13 composed of a pack tray 11 and a pack cover 12, and a secondary battery module 20 accommodated in the pack outer case 13. I have.

二次電池パック10内(パック外装ケース13内)には、図2及び図3に示すように、二次電池モジュール20が複数収容されており、各二次電池モジュール20は、複数の二次電池セル30を備えている。   As shown in FIGS. 2 and 3, a plurality of secondary battery modules 20 are accommodated in the secondary battery pack 10 (in the pack outer case 13), and each secondary battery module 20 includes a plurality of secondary battery modules 20. A battery cell 30 is provided.

なお二次電池モジュール20が備える二次電池セル30の数は、特に限定されるものではない。二次電池モジュール20は、例えば、一つの二次電池セル30を備えるものであってもよい。   In addition, the number of the secondary battery cells 30 with which the secondary battery module 20 is provided is not specifically limited. For example, the secondary battery module 20 may include one secondary battery cell 30.

ここで、二次電池モジュール20を構成する各二次電池セル30は、例えば、リチウムイオン電池である密閉型の電池であり、それ自体は既存の構造である。各二次電池セル30は、図4に示すように、正極板41及び負極板42を備える電極体40と、集電体50,51とが非水電解液(非水電解質)60と共に電池外装部材(ケース)70内に収容されている。電池外装部材(ケース)70の上部は、蓋(封止)部材80で密閉されている。   Here, each secondary battery cell 30 which comprises the secondary battery module 20 is a sealed battery which is a lithium ion battery, for example, and itself is an existing structure. As shown in FIG. 4, each secondary battery cell 30 has an electrode body 40 including a positive electrode plate 41 and a negative electrode plate 42, and current collectors 50 and 51 together with a nonaqueous electrolyte solution (nonaqueous electrolyte) 60. Housed in a member (case) 70. The upper part of the battery exterior member (case) 70 is sealed with a lid (sealing) member 80.

図示は省略するが、電池外装部材(ケース)70内には電池外装部材(ケース)70の内面を覆う絶縁部材が設けられており、電池外装部材(ケース)70と内部に収容される電極体40及び集電体50,51との絶縁が図られている。   Although not shown, an insulating member that covers the inner surface of the battery exterior member (case) 70 is provided in the battery exterior member (case) 70, and the electrode body accommodated in the battery exterior member (case) 70. 40 and current collectors 50 and 51 are insulated.

電極体40の正極板41には集電体50の一端側が接続され、この集電体50の他端側には、蓋(封止)部材80に設けられた貫通孔81から外部に突出する正極端子部材90が接続されている。負極板42には集電体51の一端側が接続されている。この集電体51の他端側には、蓋(封止)部材80に設けられた貫通孔81から外部に突出する負極端子部材100が接続されている。   One end side of the current collector 50 is connected to the positive electrode plate 41 of the electrode body 40, and the other end side of the current collector 50 projects outside from a through hole 81 provided in the lid (sealing) member 80. A positive terminal member 90 is connected. One end of a current collector 51 is connected to the negative electrode plate 42. The other end side of the current collector 51 is connected to a negative electrode terminal member 100 that protrudes to the outside from a through hole 81 provided in the lid (sealing) member 80.

蓋(封止)部材80の上下面側には、各貫通孔81の開口部に対応して絶縁シート部材110がそれぞれ設けられている。正極端子部材90及び負極端子部材100は、この絶縁シート部材110によって蓋(封止)部材80との絶縁が図られている。   Insulating sheet members 110 are provided on the upper and lower surfaces of the lid (sealing) member 80 so as to correspond to the openings of the respective through holes 81. The positive electrode terminal member 90 and the negative electrode terminal member 100 are insulated from the lid (sealing) member 80 by the insulating sheet member 110.

なお電極体40は、例えば、金属箔からなる正極板41と負極板42とがセパレータ(図示は省略)を介して積層されて形成されている。そして電極体40は、セパレータを介して帯状の正極板41及び負極板42を扁平形状に捲回されて形成されている。帯状の正極板41及び負極板42には、両者が重なる部分に、それぞれ活物質が塗布されている。   The electrode body 40 is formed, for example, by laminating a positive electrode plate 41 and a negative electrode plate 42 made of metal foil via a separator (not shown). The electrode body 40 is formed by winding a strip-like positive electrode plate 41 and a negative electrode plate 42 into a flat shape via a separator. The belt-like positive electrode plate 41 and the negative electrode plate 42 are each coated with an active material at a portion where they overlap each other.

そして二次電池パック10は、このような構成の二次電池セル30(二次電池モジュール20)を複数備えていると共に、各二次電池セル30内(電池外装部材(ケース)70内)を減圧させる減圧機構200を備えている。   The secondary battery pack 10 includes a plurality of secondary battery cells 30 (secondary battery modules 20) having such a configuration, and each secondary battery cell 30 (within a battery exterior member (case) 70). A pressure reducing mechanism 200 for reducing the pressure is provided.

本実施形態では、図5に示すように、このような二次電池セル30を複数備えた二次電池モジュール20が、各二次電池セル30の電池外装部材(ケース)70内を減圧させる減圧機構200を備えている。本発明に係る二次電池パック10および二次電池モジュール20は、この減圧機構200を備える点に特徴がある。   In the present embodiment, as shown in FIG. 5, the secondary battery module 20 including a plurality of such secondary battery cells 30 reduces the pressure inside the battery exterior member (case) 70 of each secondary battery cell 30. A mechanism 200 is provided. The secondary battery pack 10 and the secondary battery module 20 according to the present invention are characterized in that the decompression mechanism 200 is provided.

減圧機構200は、具体的には、排気管(排気通路部材)210と、この排気管210に設けられる真空ポンプ220と、を備えている。排気管210は、その一端側が二次電池セル30の電池外装部材(ケース)70に接続され、電池外装部材(ケース)70内のガスを排出するための通路を形成する。   Specifically, the decompression mechanism 200 includes an exhaust pipe (exhaust passage member) 210 and a vacuum pump 220 provided in the exhaust pipe 210. One end side of the exhaust pipe 210 is connected to the battery exterior member (case) 70 of the secondary battery cell 30 to form a passage for discharging the gas in the battery exterior member (case) 70.

また本実施形態に係る減圧機構200は、各二次電池モジュール20に対してそれぞれ設けられている。つまり二次電池パック10は、二次電池モジュール20と同数の減圧機構200を備えている。そして排気管210は、各二次電池セル30に接続される複数の個別通路部211と、これらの個別通路部211が接続される共通通路部212と、を備えている。真空ポンプ220は、このような排気管210の途中に設けられている。   Moreover, the decompression mechanism 200 according to the present embodiment is provided for each secondary battery module 20. That is, the secondary battery pack 10 includes the same number of decompression mechanisms 200 as the secondary battery module 20. The exhaust pipe 210 includes a plurality of individual passage portions 211 connected to the respective secondary battery cells 30 and a common passage portion 212 to which these individual passage portions 211 are connected. The vacuum pump 220 is provided in the middle of such an exhaust pipe 210.

真空ポンプ220は、例えば、共通通路部212の個別通路部211が接続される接続部212aよりも下流側(二次電池セル30からの排気の流れ方向において下流側)に配設されている。これにより、一台の真空ポンプ220によって二次電池モジュール20を構成する複数の各二次電池セル30内を減圧できるようになっている。   For example, the vacuum pump 220 is disposed on the downstream side (downstream side in the flow direction of exhaust gas from the secondary battery cell 30) with respect to the connection portion 212a to which the individual passage portion 211 of the common passage portion 212 is connected. Thereby, the inside of each of the plurality of secondary battery cells 30 constituting the secondary battery module 20 can be decompressed by a single vacuum pump 220.

かかる本実施形態の二次電池パック10では、例えば、車両1の電源投入時等、予め設定された所定のタイミングで、減圧機構200を構成する真空ポンプ220を所定時間だけ作動させる。   In the secondary battery pack 10 of this embodiment, for example, the vacuum pump 220 constituting the decompression mechanism 200 is operated for a predetermined time at a predetermined timing set in advance, for example, when the vehicle 1 is turned on.

これにより、二次電池セル30内が排気管210を介して排気されて減圧される。すなわち二次電池セル30内は、大気圧よりも低い圧力(負圧)状態となり、好ましくは大気圧より十分に圧力が低い真空状態となる。言い換えれば、二次電池セル30の外面に対し、内側に向かう圧力(大気圧)が印加された状態となる。   Thereby, the inside of the secondary battery cell 30 is exhausted through the exhaust pipe 210 and decompressed. That is, the inside of the secondary battery cell 30 is in a pressure (negative pressure) state lower than atmospheric pressure, and is preferably in a vacuum state whose pressure is sufficiently lower than atmospheric pressure. In other words, the pressure (atmospheric pressure) toward the inside is applied to the outer surface of the secondary battery cell 30.

したがって、電池外装部材(ケース)70内に収容されている電極体40は、電池外装部材(ケース)70によって拘束される。従来のように拘束治具によって各二次電池セル30を拘束しなくても、電極体40は、電池外装部材(ケース)70によって十分に拘束される。よって、二次電池セル30の出力性能の変動等を抑制することができる。   Therefore, the electrode body 40 accommodated in the battery exterior member (case) 70 is restrained by the battery exterior member (case) 70. Even if each secondary battery cell 30 is not restrained by a restraining jig as in the prior art, the electrode body 40 is sufficiently restrained by the battery exterior member (case) 70. Therefore, the fluctuation | variation etc. of the output performance of the secondary battery cell 30 can be suppressed.

さらに排気管210には、真空ポンプ220の上流側に、二次電池セル30内からの排気の逆流を防止する逆止弁230が設けられている。本実施形態では、逆止弁230は、真空ポンプ220と同様に、共通通路部212の接続部212aよりも下流側で真空ポンプ220に近接して配置されている。   Further, the exhaust pipe 210 is provided with a check valve 230 on the upstream side of the vacuum pump 220 to prevent the backflow of exhaust from the secondary battery cell 30. In the present embodiment, the check valve 230 is disposed close to the vacuum pump 220 on the downstream side of the connection portion 212 a of the common passage portion 212, similarly to the vacuum pump 220.

このように排気管210に逆止弁230が設けられていることで、各二次電池セル30内からの排気の逆流を防止することができる。したがって、真空ポンプ220を作動させて二次電池セル30内を減圧させた際、各二次電池セル30内をより適切な負圧状態(真空状態)に保持することができる。   Thus, by providing the check valve 230 in the exhaust pipe 210, it is possible to prevent the backflow of the exhaust from each secondary battery cell 30. Therefore, when the inside of the secondary battery cell 30 is depressurized by operating the vacuum pump 220, the inside of each secondary battery cell 30 can be held in a more appropriate negative pressure state (vacuum state).

以上のように、本実施形態に係る二次電池パック10によれば、各二次電池モジュール20が備える各二次電池セル30を拘束治具等により拘束しなくても、電極体40を適切に拘束することができる。したがって、二次電池モジュール20の小型・軽量化を図ることができ、それに伴い、二次電池パック10の小型・軽量化を図ることができる。   As described above, according to the secondary battery pack 10 according to the present embodiment, the electrode body 40 is appropriately disposed without restraining each secondary battery cell 30 included in each secondary battery module 20 with a restraining jig or the like. Can be restrained. Therefore, the secondary battery module 20 can be reduced in size and weight, and accordingly, the secondary battery pack 10 can be reduced in size and weight.

なお本実施形態に係る二次電池モジュール20においても、必要に応じて各二次電池セル30を拘束部材(図示は省略)によって拘束するようにしてもよい。この場合でも、拘束部材によって二次電池セル30を拘束する拘束圧は、従来よりも低くて済む。したがって、拘束部材の小型・軽量化を図ることができ、それに伴い二次電池モジュール20および二次電池パック10の小型・軽量化を図ることができる。   In the secondary battery module 20 according to the present embodiment, each secondary battery cell 30 may be restrained by a restraining member (not shown) as necessary. Even in this case, the restraining pressure for restraining the secondary battery cell 30 by the restraining member may be lower than the conventional one. Therefore, the restraining member can be reduced in size and weight, and accordingly, the secondary battery module 20 and the secondary battery pack 10 can be reduced in size and weight.

ところで、真空ポンプ220の配置は、特に限定されないが、二次電池パック10を構成するパック外装ケース13の外部に配置することが好ましい。排気管210を各二次電池セル30からパック外装ケース13の外側まで延設し、パック外装ケース13の外側で真空ポンプ220に接続することが好ましい。   By the way, the arrangement of the vacuum pump 220 is not particularly limited, but is preferably arranged outside the pack outer case 13 constituting the secondary battery pack 10. It is preferable that the exhaust pipe 210 is extended from each secondary battery cell 30 to the outside of the pack outer case 13 and connected to the vacuum pump 220 on the outer side of the pack outer case 13.

このような構成とすることで、二次電池セル30が収容されたパック外装ケース13の小型・軽量化を図ることができる。パック外装ケース13が小型・軽量化されることで、車両1に対して真空ポンプ220を含む二次電池パック10を搭載し易くなる。   By setting it as such a structure, size reduction and weight reduction of the pack exterior case 13 in which the secondary battery cell 30 was accommodated can be achieved. Since the pack outer case 13 is reduced in size and weight, the secondary battery pack 10 including the vacuum pump 220 can be easily mounted on the vehicle 1.

また排気管210(個別通路部211)の電池外装部材(ケース)70との接続位置は、特に限定されないが、車両1に搭載された状態における電池外装部材(ケース)70の上部に接続されていることが好ましい。また排気管210は、電池外装部材(ケース)70の上部を密封する蓋(封止)部材80に接続されていてもよい。   Further, the connection position of the exhaust pipe 210 (individual passage portion 211) with the battery exterior member (case) 70 is not particularly limited, but is connected to the upper portion of the battery exterior member (case) 70 in the state where it is mounted on the vehicle 1. Preferably it is. Further, the exhaust pipe 210 may be connected to a lid (sealing) member 80 that seals the upper portion of the battery exterior member (case) 70.

つまり、排気管210は電池外装部材(ケース)70内に収容されている非水電解液60の液面よりも上方で二次電池セル30(電池外装部材(ケース)70、蓋(封止)部材80)に接続されていることが好ましい(図4参照)。これにより、電池外装部材(ケース)70内のガスを排気管210を介して外部に排出し易くなる。   That is, the exhaust pipe 210 is located above the liquid surface of the nonaqueous electrolyte solution 60 accommodated in the battery exterior member (case) 70, and the secondary battery cell 30 (battery exterior member (case) 70, lid (sealing)). It is preferably connected to the member 80) (see FIG. 4). Thereby, the gas in the battery exterior member (case) 70 can be easily discharged to the outside through the exhaust pipe 210.

(実施形態2)
図6は、実施形態2に係る二次電池パック10の概略構成を示すブロック図であり、図7は、実施形態2に係る二次電池パック10の動作、特に、減圧機構の動作の一例を説明するフローチャートである。なお図中、同一部材には同一符号を付し、重複する説明は省略する。
(Embodiment 2)
FIG. 6 is a block diagram illustrating a schematic configuration of the secondary battery pack 10 according to the second embodiment. FIG. 7 illustrates an example of the operation of the secondary battery pack 10 according to the second embodiment, in particular, the operation of the decompression mechanism. It is a flowchart to explain. In the drawings, the same members are denoted by the same reference numerals, and redundant description is omitted.

上述の実施形態では、予め設定された所定のタイミングで真空ポンプ220を作動させることで、電池外装部材(ケース)70内を負圧状態(好ましくは真空状態)に保持するようにしたが、本実施形態は、電池外装部材(ケース)70の内圧に応じて真空ポンプ220を作動させるようにした例である。   In the above-described embodiment, the inside of the battery exterior member (case) 70 is held in a negative pressure state (preferably a vacuum state) by operating the vacuum pump 220 at a predetermined timing set in advance. The embodiment is an example in which the vacuum pump 220 is operated in accordance with the internal pressure of the battery exterior member (case) 70.

具体的には、図6に示すように、本実施形態に係る二次電池パック10は、各二次電池モジュール20が備える真空ポンプ220の作動状態を制御する制御部(制御装置)300を備えている。なお制御部300は、例えば、入出力装置、記憶装置(ROM、RAM等)、中央処理装置(CPU)、タイマーカウンタ等で構成されている。なお図6では、一つの真空ポンプ220のみを図示しているが、制御部300は、各二次電池モジュールが備える真空ポンプ220のそれぞれを制御する。   Specifically, as shown in FIG. 6, the secondary battery pack 10 according to the present embodiment includes a control unit (control device) 300 that controls the operating state of the vacuum pump 220 included in each secondary battery module 20. ing. The control unit 300 includes, for example, an input / output device, a storage device (ROM, RAM, etc.), a central processing unit (CPU), a timer counter, and the like. In FIG. 6, only one vacuum pump 220 is illustrated, but the control unit 300 controls each of the vacuum pumps 220 included in each secondary battery module.

また各二次電池セル30の電池外装部材(ケース)70内には、二次電池セル30内の圧力(内圧)を検出する圧力センサ310が設けられている。制御部300は、この圧力センサ310の検出結果に応じて、各真空ポンプ220を作動させる。   A pressure sensor 310 that detects the pressure (internal pressure) in the secondary battery cell 30 is provided in the battery exterior member (case) 70 of each secondary battery cell 30. The control unit 300 operates each vacuum pump 220 according to the detection result of the pressure sensor 310.

具体的には、図7のフローチャートに示すように、制御部300は、車両1の電源が投入されると、ステップS1で各二次電池セル30に設けられた圧力センサ310の検出結果に基づいて、二次電池セル30内の圧力Prが、予め設定された第1の閾値P1よりも高いか否かを判定する(内圧判定)。   Specifically, as shown in the flowchart of FIG. 7, when the power of the vehicle 1 is turned on, the control unit 300 is based on the detection result of the pressure sensor 310 provided in each secondary battery cell 30 in step S1. Then, it is determined whether or not the pressure Pr in the secondary battery cell 30 is higher than a preset first threshold value P1 (internal pressure determination).

ここで、二次電池セル30の内圧Prが第1の閾値P1よりも高い場合には(ステップS1:Yes)、ステップS2に進み、真空ポンプ220を作動させて、二次電池セル30内を減圧させる。その後、ステップS3で各二次電池セル30の内圧Prが、予め設定された第2の閾値P2(<P1)よりも低くなったか否かを判定する(内圧判定)。   Here, when the internal pressure Pr of the secondary battery cell 30 is higher than the first threshold value P1 (step S1: Yes), the process proceeds to step S2, the vacuum pump 220 is operated, and the interior of the secondary battery cell 30 is maintained. Reduce pressure. Thereafter, in step S3, it is determined whether or not the internal pressure Pr of each secondary battery cell 30 has become lower than a preset second threshold value P2 (<P1) (internal pressure determination).

そして各二次電池セル30の内圧Prが第2の閾値P2よりも低くなると(ステップS3:Yes)、ステップS4で真空ポンプ220を停止させる(ポンプ制御)。言い換えれば、各二次電池セル30内の圧力Prが第2の閾値P2よりも低くなるまで、真空ポンプ220を作動させる。そして、車両1の電源が投入されている間は、この一連の処理を繰り返し実施する。   And if the internal pressure Pr of each secondary battery cell 30 becomes lower than the 2nd threshold value P2 (step S3: Yes), the vacuum pump 220 will be stopped by step S4 (pump control). In other words, the vacuum pump 220 is operated until the pressure Pr in each secondary battery cell 30 becomes lower than the second threshold value P2. And while the power supply of the vehicle 1 is turned on, this series of processes is repeatedly performed.

このように本実施形態では、各二次電池セル30の内圧に応じて真空ポンプ220を作動させるようにしたので、各二次電池セル30の内圧をより適切に調整することができる。   Thus, in this embodiment, since the vacuum pump 220 was operated according to the internal pressure of each secondary battery cell 30, the internal pressure of each secondary battery cell 30 can be adjusted more appropriately.

なお本実施形態では、各二次電池セル30の内圧を検出し、その検出結果に応じて、真空ポンプ220の動作状態を制御するようにしたが、真空ポンプ220の制御方法は、これに限定されるものではない。例えば、電池外装部材(ケース)70の変位を検出し、その検出結果に応じて真空ポンプ220の作動状態を制御するようにしてもよい。   In the present embodiment, the internal pressure of each secondary battery cell 30 is detected, and the operation state of the vacuum pump 220 is controlled according to the detection result. However, the control method of the vacuum pump 220 is limited to this. Is not to be done. For example, the displacement of the battery exterior member (case) 70 may be detected, and the operating state of the vacuum pump 220 may be controlled according to the detection result.

以上、本発明の実施形態について説明したが、本発明は、上述の実施形態に限定されるものではない。本発明は、その趣旨を逸脱しない範囲で適宜変更が可能なものである。   As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.

例えば、上述の実施形態では、逆止弁を排気管の共通通路部に設けるようにしたが、これに限定されず、各二次電池セルに対応する複数の逆止弁を、個別通路部にそれぞれ設けるようにしてもよい。   For example, in the above-described embodiment, the check valve is provided in the common passage portion of the exhaust pipe. However, the present invention is not limited to this, and a plurality of check valves corresponding to the respective secondary battery cells are provided in the individual passage portion. Each may be provided.

また上述の実施形態では、二次電池モジュール毎に減圧機構(真空ポンプ)を設けた構成を例示したが、二次電池パックが備える減圧機構の数は特に限定されない。二次電池パックは、少なくとも一つの減圧機構を備えていればよい。真空ポンプの性能にもよるが、二次電池パックが備える全ての二次電池セルの内部を一台の真空ポンプで減圧するようにしてもよい。勿論、各二次電池セルに対して個別に減圧機構が設けられていてもよい。   Moreover, although the structure which provided the decompression mechanism (vacuum pump) for every secondary battery module was illustrated in the above-mentioned embodiment, the number of decompression mechanisms with which a secondary battery pack is provided is not specifically limited. The secondary battery pack only needs to include at least one decompression mechanism. Although depending on the performance of the vacuum pump, the inside of all the secondary battery cells included in the secondary battery pack may be decompressed with a single vacuum pump. Of course, a decompression mechanism may be provided for each secondary battery cell.

また上述の実施形態では、電極体が非水電解液と共に電池外装部材(ケース)内に収納された二次電池セルを備える二次電池モジュールおよび二次電池パックを一例として本発明を説明したが、二次電池セルの構成は、これに限定されるものではなく、例えば、非水電解液を固体電解質層に代えて電池を固体化した、いわゆる全固体電池であってもよい。このような全固体電池を収容した二次電池モジュールおよび二次電池パックであっても、上述の実施形態と同様に、小型・軽量化を図ることができる。   In the above-described embodiment, the present invention has been described by taking, as an example, a secondary battery module and a secondary battery pack that include a secondary battery cell in which an electrode body is housed in a battery exterior member (case) together with a non-aqueous electrolyte. The configuration of the secondary battery cell is not limited to this, and may be a so-called all-solid battery in which the non-aqueous electrolyte is replaced with a solid electrolyte layer to solidify the battery. Even in a secondary battery module and a secondary battery pack that accommodate such an all-solid battery, it is possible to reduce the size and weight as in the above-described embodiment.

さらに、上述の実施形態では、電池外装部材として角形の電池ケースを例示したが、電池外装部材は、例えば、パウチ型のものであってもよい。勿論、パウチ型の電池外装部材を用いた場合でも、上述の実施形態と同様に、二次電池モジュール及び二次電池パックの小型・軽量化を図ることができる。   Furthermore, in the above-described embodiment, a rectangular battery case is exemplified as the battery exterior member, but the battery exterior member may be, for example, a pouch-type. Of course, even when a pouch-type battery exterior member is used, the secondary battery module and the secondary battery pack can be reduced in size and weight as in the above-described embodiment.

また上述の実施形態では、車両用の二次電池モジュール及び二次電池パックを一例として本発明を説明したが、勿論、本発明は、車両用だけでなく、他の用途で使用される二次電池モジュールおよび二次電池パックにも適用可能なものである。   In the above-described embodiment, the present invention has been described by taking a secondary battery module and a secondary battery pack for a vehicle as an example. However, the present invention is not limited to a vehicle, but is used for other purposes. The present invention can also be applied to battery modules and secondary battery packs.

1 車両
10 二次電池パック
11 パックトレイ
12 パックカバー
13 パック外装ケース
20 二次電池モジュール
30 二次電池セル
40 電極体
41 正極板
42 負極板
50,51 集電体
60 非水電解液
70 電池外装部材(ケース)
80 蓋(封止)部材
81 貫通孔
90 正極端子部材
100 負極端子部材
110 絶縁シート部材
200 減圧機構
210 排気管
211 個別通路部
212 共通通路部
220 真空ポンプ
230 逆止弁
300 制御部
310 圧力センサ
DESCRIPTION OF SYMBOLS 1 Vehicle 10 Secondary battery pack 11 Pack tray 12 Pack cover 13 Pack exterior case 20 Secondary battery module 30 Secondary battery cell 40 Electrode body 41 Positive electrode plate 42 Negative electrode plate 50, 51 Current collector 60 Non-aqueous electrolyte 70 Battery exterior Member (case)
80 Lid (sealing) member 81 Through-hole 90 Positive electrode terminal member 100 Negative electrode terminal member 110 Insulating sheet member 200 Pressure reducing mechanism 210 Exhaust pipe 211 Individual passage portion 212 Common passage portion 220 Vacuum pump 230 Check valve 300 Control portion 310 Pressure sensor

Claims (6)

正極と負極とがセパレータを介して積層された電極体と、前記電極体を非水電解質と共に収容する電池外装部材と、を有する二次電池セルを備えた二次電池モジュールであって、
前記二次電池セル内を減圧させる減圧機構を備えている
ことを特徴とする二次電池モジュール。
A secondary battery module comprising a secondary battery cell having an electrode body in which a positive electrode and a negative electrode are stacked via a separator, and a battery exterior member that houses the electrode body together with a nonaqueous electrolyte,
A secondary battery module comprising a decompression mechanism for decompressing the inside of the secondary battery cell.
請求項1に記載の二次電池モジュールであって、
前記減圧機構は、前記電池外装部材に接続される排気通路部材と、該排気通路部材に設けられ前記二次電池セル内を排気して減圧させる真空ポンプと、を含む
ことを特徴とする二次電池モジュール。
The secondary battery module according to claim 1,
The decompression mechanism includes an exhaust passage member connected to the battery exterior member, and a vacuum pump provided in the exhaust passage member and exhausting the inside of the secondary battery cell to decompress the secondary battery cell. Battery module.
請求項2に記載の二次電池モジュールであって、
前記二次電池セルを複数個備えており、
前記排気通路部材は、各二次電池セルの前記電池外装部材に接続される個別通路部と、各個別通路部が接続される共通通路部と、を含み、
前記真空ポンプは、各個別通路部が接続される前記共通通路部の接続部よりも下流側に配置されている
ことを特徴とする二次電池モジュール。
The secondary battery module according to claim 2,
A plurality of the secondary battery cells,
The exhaust passage member includes an individual passage portion connected to the battery exterior member of each secondary battery cell, and a common passage portion to which each individual passage portion is connected,
The secondary battery module, wherein the vacuum pump is disposed downstream of a connection portion of the common passage portion to which each individual passage portion is connected.
請求項2又は3に記載の二次電池モジュールであって、
前記排気通路部材には、前記二次電池セル内への排気の逆流を防止する逆止弁が設けられている
ことを特徴とする二次電池モジュール。
The secondary battery module according to claim 2 or 3,
The secondary battery module, wherein the exhaust passage member is provided with a check valve for preventing a reverse flow of exhaust gas into the secondary battery cell.
請求項1から4の何れか一項に記載の二次電池モジュールを備えることを特徴とする二次電池パック。   A secondary battery pack comprising the secondary battery module according to claim 1. 正極と負極とがセパレータを介して積層された電極体と、前記電極体を非水電解質と共に収容する電池外装部材と、を有する二次電池セルを備えた二次電池パックであって、
前記二次電池セル内を減圧させる減圧機構を備えている
ことを特徴とする二次電池パック。
A secondary battery pack comprising a secondary battery cell having an electrode body in which a positive electrode and a negative electrode are laminated via a separator, and a battery exterior member that houses the electrode body together with a nonaqueous electrolyte,
A secondary battery pack comprising a decompression mechanism for decompressing the inside of the secondary battery cell.
JP2018058860A 2018-03-26 2018-03-26 Secondary battery module and secondary battery pack Pending JP2019175552A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4273983A1 (en) * 2022-04-28 2023-11-08 Toyota Jidosha Kabushiki Kaisha Battery, battery module, and method for producing battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4273983A1 (en) * 2022-04-28 2023-11-08 Toyota Jidosha Kabushiki Kaisha Battery, battery module, and method for producing battery

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