JP2013205044A - Pressure measuring apparatus for power storage device and method thereof - Google Patents

Pressure measuring apparatus for power storage device and method thereof Download PDF

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JP2013205044A
JP2013205044A JP2012070970A JP2012070970A JP2013205044A JP 2013205044 A JP2013205044 A JP 2013205044A JP 2012070970 A JP2012070970 A JP 2012070970A JP 2012070970 A JP2012070970 A JP 2012070970A JP 2013205044 A JP2013205044 A JP 2013205044A
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storage device
pressure
temperature
electricity storage
pipe
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Makiko Kichise
万希子 吉瀬
Seiji Yoshioka
省二 吉岡
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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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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Abstract

PROBLEM TO BE SOLVED: To provide a pressure measuring apparatus for a power storage device in which a pressure inside the power storage device can be measured accurately even if a disturbance is applied to the power storage device and a temperature of the power storage device itself is elevated suddenly, for example.SOLUTION: The pressure measuring apparatus comprises a pipe (2) of which one end is connected to a power storage device in such a manner that an internal pressure can be measured, a pressure detector (3) connected to another end of the pipe for detecting the pressure inside the power storage device, and temperature managers (4, 5) for performing temperature management by heating or cooling the pipe including the pressure detector.

Description

この発明は、蓄電デバイス内部の圧力を測定する装置及びその方法に関するものである。   The present invention relates to an apparatus and a method for measuring the pressure inside an electricity storage device.

蓄電デバイスの代表として挙げられるリチウム二次電池は、携帯機器のみならず、ＥＶ(電気自動車)や家庭用蓄電池等の大型電源として近年急激に普及している。このリチウム二次電池は、正極活物質にリチウム金属酸化物を、負極活物質にカーボンを、電解液には有機溶媒とリチウム塩からなり、正極活物質と負極活物質の間をリチウムイオンが可逆的にインターカレート−デインターカレートすることにより充放電が行われている。このリチウム二次電池は通常の可逆的な充放電においてはほとんどガスが発生しないが、過充電、過放電や過熱により、電解液が電極表面で分解し、反応生成物としてのガスが発生する。また、電池が過度に劣化すると同様にガスが発生する場合がある。このように電池内におけるガスの発生は電池において発生した事象を解析するための有効な情報であり、ガスが発生した際に電池の内圧を測定してガスの発生量を知ることは、電池内部での反応の解析を進める上で非常に有効である。   In recent years, lithium secondary batteries, which are representative of power storage devices, have rapidly spread as large-scale power sources for not only portable devices but also EVs (electric vehicles) and household storage batteries. This lithium secondary battery consists of a lithium metal oxide as a positive electrode active material, carbon as a negative electrode active material, an organic solvent and a lithium salt as an electrolyte, and lithium ions are reversible between the positive electrode active material and the negative electrode active material. In general, charging / discharging is performed by intercalating and deintercalating. The lithium secondary battery generates almost no gas during normal reversible charging / discharging, but due to overcharging, overdischarging, or overheating, the electrolytic solution is decomposed on the electrode surface to generate gas as a reaction product. Further, when the battery is excessively deteriorated, gas may be generated as well. As described above, the generation of gas in the battery is effective information for analyzing an event occurring in the battery. When the gas is generated, measuring the internal pressure of the battery to know the generation amount of the gas This is very effective for the analysis of the reaction.

このため、蓄電池に直接圧力センサを取り付け、充放電時の圧力変化や電池製造時の圧力管理を行っている例がある(例えば下記特許文献１及び２参照)。   For this reason, there is an example in which a pressure sensor is directly attached to a storage battery and pressure change during charge / discharge and pressure management during battery manufacture are performed (for example, see Patent Documents 1 and 2 below).

特開平９−１２０８４５号公報JP-A-9-120845 特開２０１０−１０２９２８号公報JP 2010-102928 A

このような従来の蓄電デバイスの圧力測定装置にあっては、圧力測定部が蓄電デバイスに直接若しくは蓄電デバイスのごく近傍に設置されているため、蓄電デバイスが過渡的な状態になり、温度が急激に上昇した際には、圧力センサの温度自体も高温になり機能しなくなってしまう、若しくは蓄電デバイスの正確な圧力を測定することができなかった。   In such a conventional pressure measuring device for an electricity storage device, since the pressure measuring unit is installed directly on the electricity storage device or in the vicinity of the electricity storage device, the electricity storage device becomes in a transitional state and the temperature rapidly increases. When the temperature rises, the temperature of the pressure sensor itself becomes too high to function, or the accurate pressure of the electricity storage device cannot be measured.

この発明は、上記のような問題点を解決するためになされたものであり、例えば蓄電デバイスに外乱が加わり、蓄電デバイス自体の温度が急上昇した場合においても、蓄電デバイス内部の圧力を正確に測定可能な蓄電デバイスの圧力測定装置等を提供することを目的としている。   The present invention has been made to solve the above-described problems. For example, even when a disturbance is applied to the power storage device and the temperature of the power storage device itself rises rapidly, the pressure inside the power storage device is accurately measured. An object of the present invention is to provide a pressure measuring device for an electricity storage device that can be used.

この発明は、一端が蓄電デバイスに内部圧力が測定可能に接続された配管と、前記配管の他端に接続されて前記蓄電デバイス内部の圧力を検出する圧力検出部と、前記圧力検出部を含む前記配管を加熱または冷却して温度管理を行う温度管理部と、を備えたことを特徴とする蓄電デバイスの圧力測定装置等にある。   The present invention includes a pipe having one end connected to the electricity storage device so that the internal pressure can be measured, a pressure detection unit connected to the other end of the pipe and detecting the pressure inside the electricity storage device, and the pressure detection unit And a temperature management unit that performs temperature management by heating or cooling the pipe.

この発明によれば、上記の構成としたことにより、蓄電デバイスの温度が急上昇した際においても、圧力検出部の温度が一定であるため、蓄電デバイスの内部温度によらず正確な圧力計側が行える。   According to the present invention, since the temperature of the power storage device rapidly increases, the temperature of the pressure detection unit is constant even when the temperature of the power storage device rapidly rises, so that an accurate pressure gauge side can be performed regardless of the internal temperature of the power storage device. .

この発明による蓄電デバイスの圧力測定装置の構成図である。It is a block diagram of the pressure measuring apparatus of the electrical storage device by this invention. この発明の実施の形態２による蓄電デバイスの圧力測定装置に特に係る部分の具体的な構成を示した図である。It is the figure which showed the specific structure of the part which concerns especially on the pressure measuring device of the electrical storage device by Embodiment 2 of this invention. この発明による蓄電デバイスの圧力測定装置の変形例を説明するための部分構成図である。It is a partial block diagram for demonstrating the modification of the pressure measuring apparatus of the electrical storage device by this invention. この発明による蓄電デバイスの圧力測定装置の別の変形例を説明するための部分構成図である。It is a partial block diagram for demonstrating another modification of the pressure measuring apparatus of the electrical storage device by this invention. 実施例１における温度、電圧、圧力を説明するための図である。It is a figure for demonstrating the temperature in Example 1, a voltage, and a pressure. 比較例１における温度、電圧、圧力を説明するための図である。It is a figure for demonstrating the temperature in the comparative example 1, a voltage, and a pressure.

この発明では、例えば蓄電デバイスに外乱が加わり、蓄電デバイス自体の温度が急上昇した場合においても、蓄電デバイス内部の圧力を正確に測定し、蓄電デバイス内部で発生した事象の解析が行える。   In the present invention, for example, even when a disturbance is applied to the power storage device and the temperature of the power storage device itself rises rapidly, the pressure inside the power storage device can be accurately measured and an event occurring inside the power storage device can be analyzed.

以下、この発明による蓄電デバイスの圧力測定装置及びその方法を各実施の形態に従って図面を用いて説明する。なお、各実施の形態において、同一もしくは相当部分は同一符号で示し、重複する説明は省略する。   Hereinafter, a pressure measuring device and method for an electricity storage device according to the present invention will be described with reference to the drawings according to each embodiment. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

実施の形態１．
図１はこの発明による蓄電デバイスの圧力測定装置の構成図である。１は蓄電デバイス、２は配管、３ａは圧力検出部３を構成する圧力検出器、４はヒータ４ａａと放熱フィン４ａｂを含む加温・冷却機構４ａ、および加温・冷却機構４ａの温度管理をする温度管理器４ｂを含む温度管理部、５は蓄電デバイス１および配管２の温度をそれぞれ検出する温度センサ５ａ，５ｂおよび温度センサ５ａ，５ｂからの信号を受ける温度検出器５ｃを含む温度検出部、６は配管２に挿入された開閉バルブ、７は蓄電デバイス１の電圧を検出する電圧検出部を構成する電圧検出器、１００は圧力検出器３ａ、温度センサ５ａ、電圧検出器７等からの信号を受けて圧力、温度、電圧の測定、これらに基づく種々の解析を行うと共に温度管理器４ｂ、各開閉バルブ６、ガズ流量調整弁２０(図４参照)等の測定動作制御を行う測定制御装置である。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a pressure measuring device for an electricity storage device according to the present invention. 1 is an electricity storage device, 2 is a pipe, 3a is a pressure detector constituting the pressure detector 3, 4 is a heating / cooling mechanism 4a including a heater 4aa and a heat radiation fin 4ab, and temperature management of the heating / cooling mechanism 4a. A temperature management unit 5 including a temperature management unit 4b, and a temperature detection unit 5 including temperature sensors 5a and 5b for detecting temperatures of the power storage device 1 and the pipe 2 and a temperature detector 5c for receiving signals from the temperature sensors 5a and 5b, respectively. , 6 is an open / close valve inserted in the pipe 2, 7 is a voltage detector constituting a voltage detector for detecting the voltage of the electricity storage device 1, and 100 is from the pressure detector 3a, the temperature sensor 5a, the voltage detector 7, etc. In response to the signal, the pressure, temperature and voltage are measured, and various analyzes based on these are performed, and the measurement operation control of the temperature controller 4b, each on-off valve 6 and the gas flow rate adjusting valve 20 (see FIG. 4) is controlled. A control device.

以下、この発明の実施の形態１の蓄電デバイスの圧力測定装置について説明する。配管２は一端が蓄電デバイス１に蓄電デバイス内部の圧力検出が可能なように接続され、他端が圧力センサ、圧力ゲージなどで圧力を測定し、測定した圧力を電気信号に変換して出力する圧力検出部の、上記圧力センサ、圧力ゲージ等からなる圧力検出器３ａが接続されている。配管２は一般的なＳＵＳ(ステインレス鋼)や銅製の配管で、フレキシブルチューブのように自由度のあるものでもよい。   Hereinafter, the pressure measuring device of the electrical storage device of Embodiment 1 of this invention is demonstrated. One end of the pipe 2 is connected to the electricity storage device 1 so that the pressure inside the electricity storage device can be detected, and the other end is measured with a pressure sensor, a pressure gauge, or the like, and the measured pressure is converted into an electrical signal and output. A pressure detector 3a composed of the pressure sensor, pressure gauge, and the like of the pressure detector is connected. The pipe 2 is a general SUS (stainless steel) or copper pipe, and may be flexible like a flexible tube.

圧力検出器３ａは加温・冷却機構４ａ、温度管理器４ｂを含む温度管理部４により一定温度に保持されている。加温・冷却機構４ａは温度管理器４ｂにより圧力検出器３ａが一定温度になるように制御されている。即ち、蓄電デバイス１の温度が低い場合には、加温・冷却機構４ａで圧力検出器３ａの加熱を行い、また、蓄電デバイス１の温度が高い場合には加温・冷却機構４ａで圧力検出器３ａの冷却をおこなう。   The pressure detector 3a is maintained at a constant temperature by a temperature management unit 4 including a heating / cooling mechanism 4a and a temperature management unit 4b. The heating / cooling mechanism 4a is controlled by the temperature controller 4b so that the pressure detector 3a has a constant temperature. That is, when the temperature of the electricity storage device 1 is low, the pressure detector 3a is heated by the heating / cooling mechanism 4a, and when the temperature of the electricity storage device 1 is high, the pressure is detected by the heating / cooling mechanism 4a. The vessel 3a is cooled.

なお、加温・冷却機構４ａとしては例えばヒータと、放熱フィンと冷却用ファン、又は螺旋配管に水等の比熱の高い液体を還流させたものからなり、温度管理器４ｂはその温度管理する制御を行う。   The heating / cooling mechanism 4a is composed of, for example, a heater, a heat radiating fin, a cooling fan, or a spiral pipe in which a liquid having a high specific heat such as water is circulated. I do.

この構成により、蓄電デバイス１の温度が急上昇した際においても、圧力検出器３ａの温度がコントロールされているため圧力検出器３ａの機能を損なうことなく蓄電デバイス１の正確な圧力が計測できる。   With this configuration, even when the temperature of the power storage device 1 rapidly rises, the accurate pressure of the power storage device 1 can be measured without impairing the function of the pressure detector 3a because the temperature of the pressure detector 3a is controlled.

なおこの場合、例えば後述する温度検出部の配管２の温度を検出する温度センサ５ｂからの信号を温度検出器５ｃを介して測定制御装置１００に入力して、測定制御装置１００が温度管理器４ｂに制御信号を送ってフィードバック制御を行う。   In this case, for example, a signal from a temperature sensor 5b for detecting the temperature of the pipe 2 of the temperature detection unit described later is input to the measurement control device 100 via the temperature detector 5c, and the measurement control device 100 is connected to the temperature manager 4b. A feedback control is performed by sending a control signal to.

実施の形態２．
図２は図１のうち、この発明の実施の形態２による蓄電デバイスの圧力測定装置に特に係る部分の具体的な構成を示した図である。図２において、蓄電デバイス１近傍の配管２には加温・冷却機構４ａを構成する放熱フィン(冷却機構)４ａｂが設けられている。この放熱フィン４ａｂにより配管２を冷却して蓄電デバイス１で発生した熱が圧力センサ、圧力ゲージ等からなる圧力検出器３ａに伝わることを防ぎ、圧力検出器３ａの損傷を防いでいる。そして蓄電デバイス１の温度が急上昇した場合でも、蓄電デバイス１の正確な圧力が計測できる。圧力検出器３ａはＡ／Ｄ変換器３ｂ、さらには測定制御装置１００に接続される。
なお、圧力検出器３ａとＡ／Ｄ変換器３ｂで圧力検出部を構成する。 Embodiment 2. FIG.
FIG. 2 is a diagram showing a specific configuration of a portion related to the pressure measuring device for an electricity storage device according to Embodiment 2 of the present invention in FIG. In FIG. 2, a heat dissipating fin (cooling mechanism) 4 ab constituting the heating / cooling mechanism 4 a is provided in the pipe 2 in the vicinity of the electricity storage device 1. The heat radiation fin 4ab cools the pipe 2 to prevent heat generated in the power storage device 1 from being transmitted to the pressure detector 3a including a pressure sensor, a pressure gauge, and the like, thereby preventing damage to the pressure detector 3a. And even when the temperature of the electrical storage device 1 rises rapidly, the exact pressure of the electrical storage device 1 can be measured. The pressure detector 3 a is connected to the A / D converter 3 b and further to the measurement control device 100.
The pressure detector 3a and the A / D converter 3b constitute a pressure detector.

放熱フィン４ａｂは図２では薄板状の形状であるが、円盤状、スパイラル状のフィンでもよく、ヒートシンクの役割を果たせばどのような形状でもよい。また、放熱フィンにファン(図示省略)等で風を送って、冷却効果を高めることが可能である(共に冷却機構を構成する)。配管２は蓄電デバイス１の外装缶に開けた開口部にネジ式に固定された接続プラグ１ａにより接続されている。接続プラグ１ａの両側(蓄電デバイス１側と配管２側)にはネジが形成されている。配管２との接続には継ぎ手１ｂが使用されていて、この継ぎ手１ｂはユニオン継ぎ手やフェルール継ぎ手等接続がしやすく、気密性が保てるものが適している。配管２はＳＵＳやテフロン（登録商標）などの材質で、耐腐食性、高温耐性の高いものが好ましい。配管２を長くする場合には、フレキシブルチューブを用いることができる。   The heat dissipating fins 4ab have a thin plate shape in FIG. 2, but may be disk-shaped or spiral fins, or any shape as long as they serve as a heat sink. In addition, it is possible to enhance the cooling effect by sending air to the radiating fins with a fan (not shown) or the like (both constitute a cooling mechanism). The pipe 2 is connected to an opening opened in the outer can of the electricity storage device 1 by a connection plug 1a fixed in a screw manner. Screws are formed on both sides of the connection plug 1a (the electricity storage device 1 side and the pipe 2 side). A joint 1b is used for connection to the pipe 2, and a suitable joint 1b that can be easily connected, such as a union joint or a ferrule joint, and can maintain airtightness is suitable. The pipe 2 is preferably made of a material such as SUS or Teflon (registered trademark) and has high corrosion resistance and high temperature resistance. When making the piping 2 long, a flexible tube can be used.

また、接続プラグ１ａと蓄電デバイス１の外装缶の間にリング状のシール材が固着されていると、蓄電デバイス１の内圧が急上昇した場合でも発生ガスが漏洩することなく配管２に運ばれる。シール材はテフロン（登録商標）やメタル製の耐熱性、耐腐食性の高いガスケットが適しており、これによって気密性が高まる。蓄電デバイス１の外装缶と接続プラグ１ａの接続後に接着剤もしくはシール材を塗布することにより、機密性をあげることも可能である。   Further, when a ring-shaped sealing material is fixed between the connection plug 1a and the outer can of the power storage device 1, even when the internal pressure of the power storage device 1 rises rapidly, the generated gas is conveyed to the pipe 2 without leaking. As the sealing material, Teflon (registered trademark) or a metal-made gasket having high heat resistance and corrosion resistance is suitable, which increases the airtightness. It is possible to improve confidentiality by applying an adhesive or a sealing material after connecting the outer can of the electricity storage device 1 and the connection plug 1a.

配管２の蓄電デバイス１と反対側の先には圧力検出器３ａが接続されており、圧力検出器３ａから、測定した圧力をアナログ信号からデジタル信号に変換して出力するＡ／Ｄ変換器３ｂを通じて出力された信号は、例えばパーソナルコンピュータ(ＰＣ)からなる測定制御装置１００でデータ処理される。圧力検出器３ａ近傍の配管２には加温・冷却機構４ａを構成する例えばヒータ４ａａが巻かれ(加温機構)、温度管理器４ｂで温度管理されている。配管２の温度が低い場合、発生ガスの一部が固化して配管２内壁に付着することがあり、これを防ぐために配管２が加温されている。   A pressure detector 3a is connected to the end of the pipe 2 opposite to the power storage device 1, and an A / D converter 3b that converts the measured pressure from an analog signal to a digital signal and outputs the pressure from the pressure detector 3a. The signal output through is processed by a measurement control device 100 made up of a personal computer (PC), for example. For example, a heater 4aa constituting a heating / cooling mechanism 4a is wound around the pipe 2 in the vicinity of the pressure detector 3a (heating mechanism), and the temperature is managed by the temperature manager 4b. When the temperature of the pipe 2 is low, a part of the generated gas may solidify and adhere to the inner wall of the pipe 2, and the pipe 2 is heated to prevent this.

実施の形態３．
この発明の実施の形態３による蓄電デバイスの圧力測定装置では、図１に示すように蓄電デバイス１及び配管２には温度センサ５ａ，５ｂが取り付けられており、温度センサ５ａ，５ｂと、これらの測定した値を入力する温度検出器５ｃで温度検出部５を構成している。測定制御装置１００は圧力検出器３ａで測定した圧力、及び温度検出部５で測定した温度の値から、発生ガス量を演算する(発生ガスの定量化)。これにより、蓄電デバイス１と配管２に含まれたガスの平均温度及び測定圧力から発生ガスの圧力を正確に求めることができる Embodiment 3 FIG.
In the pressure measuring device for an electricity storage device according to Embodiment 3 of the present invention, as shown in FIG. 1, temperature sensors 5a and 5b are attached to the electricity storage device 1 and the pipe 2, and the temperature sensors 5a and 5b, A temperature detector 5c that inputs the measured value constitutes the temperature detector 5. The measurement control device 100 calculates the amount of generated gas from the pressure measured by the pressure detector 3a and the temperature measured by the temperature detector 5 (quantization of generated gas). Thereby, the pressure of generated gas can be calculated | required correctly from the average temperature and measurement pressure of the gas contained in the electrical storage device 1 and the piping 2. FIG.

また図３に示すように、配管２の圧力検出器３ａの近傍に開閉可能な開閉バルブ６を挿入し、例えば測定制御装置１００の制御により、開閉バルブ６を閉じて開閉バルブ６の出力側に接続されている圧力検出器３ａを切り離し、代わりにガス捕集容器８を接続することにより、ガスをガス捕集容器８内に採集することができる。この開閉バルブ６はボールバルブ、バタフライバルブ等のバルブが適する。ガス捕集容器８はアルミラミネート製、ポリエチレンやポリプロピレン製の容器、ポリビニール製等発生ガスを収集し、密封できるものであればどのような形状でもよい。   As shown in FIG. 3, an openable / closable valve 6 is inserted in the vicinity of the pressure detector 3 a of the pipe 2, and the open / close valve 6 is closed to the output side of the open / close valve 6 under the control of the measurement control device 100, for example. The gas can be collected in the gas collection container 8 by disconnecting the connected pressure detector 3a and connecting the gas collection container 8 instead. The opening / closing valve 6 is suitably a valve such as a ball valve or a butterfly valve. The gas collection container 8 may have any shape as long as it can collect and seal the generated gas such as aluminum laminate, polyethylene or polypropylene, and polyvinyl.

また、開閉バルブ６の出力側にコネクタ１０を接続して、圧力検出器３ａ、ガス捕集容器８を該コネクタ１０に取り換えながら接続してもよい。さらに図４に示すようにコネクタは複数方向に分岐している分岐コネクタ１０ａでもよい。分岐コネクタ１０ａの場合、分岐後の各々の配管に開閉バルブ６を取り付けることにより、目的に応じてガスの流れる方向を切り替えることができる。また、ガス捕集容器８の代わりに直接、ガス分析装置１１を接続することにより、ガスの成分を分析することができる。この場合は、開閉バルブ６とガス分析装置１１の間に、ニードル弁等のガス流量調整弁２０を接続することが好ましい。これによって、一定量のガスをガス分析装置１１に送ることが可能である。また、例えば測定制御装置１００などでの制御により、開閉バルブ６を一定間隔で開閉し、開いた時の圧力変化ΔＰを測定すれば、初期に比べてどの程度変化したかを定量化することが可能である。   Alternatively, the connector 10 may be connected to the output side of the opening / closing valve 6 so that the pressure detector 3 a and the gas collection container 8 are replaced with the connector 10 and connected. Further, as shown in FIG. 4, the connector may be a branch connector 10a that branches in a plurality of directions. In the case of the branch connector 10a, the gas flow direction can be switched according to the purpose by attaching the opening / closing valve 6 to each pipe after branching. Further, the gas component can be analyzed by directly connecting the gas analyzer 11 instead of the gas collection container 8. In this case, it is preferable to connect a gas flow rate adjusting valve 20 such as a needle valve between the opening / closing valve 6 and the gas analyzer 11. Thereby, a certain amount of gas can be sent to the gas analyzer 11. Further, for example, if the pressure change ΔP when the open / close valve 6 is opened / closed and measured when it is opened by the control of the measurement control device 100 or the like, the degree of change compared to the initial value can be quantified. Is possible.

例えば測定制御装置１００の制御により、開閉バルブ６を間欠的に開閉して測定した蓄電デバイス１の内圧と蓄電デバイス１の温度から蓄電デバイス１内部で発生した事象を解析することができる。
また、開閉バルブ６を間欠的に開閉して測定した内圧と蓄電デバイス１の温度から発生ガスを定量化することができる。 For example, under the control of the measurement control device 100, an event occurring inside the electricity storage device 1 can be analyzed from the internal pressure of the electricity storage device 1 and the temperature of the electricity storage device 1 measured by opening and closing the on-off valve 6 intermittently.
Further, the generated gas can be quantified from the internal pressure measured by opening and closing the on-off valve 6 intermittently and the temperature of the electricity storage device 1.

さらに、図１に示したように電圧検出器７、温度検出器５ｃにより蓄電デバイス１の圧力測定時に、電圧、温度のデータを同時に測定することによって、測定制御装置１００で蓄電デバイス１の圧力、電圧、温度の変化を解析して圧力が変化した原因を特定することができる。これによって蓄電デバイス１の内部状態をより正確に把握することが可能である。   Further, as shown in FIG. 1, when the pressure of the electricity storage device 1 is measured by the voltage detector 7 and the temperature detector 5c, the voltage of the electricity storage device 1 is measured by the measurement control device 100 by simultaneously measuring the voltage and temperature data. The cause of the pressure change can be identified by analyzing the change in voltage and temperature. As a result, the internal state of the electricity storage device 1 can be grasped more accurately.

また、蓄電デバイス１での配管２の取り付け場所を接続プラグ１ａに代えてガス放出弁２０とすることで、ガス放出弁２０の作動圧力以上の圧力になってもガス放出弁２０からガスが噴出することがないため、より高い圧力まで圧力を測定することが可能である。   Further, by replacing the connection plug 1a with the gas discharge valve 20 at the place where the pipe 2 is attached in the electricity storage device 1, gas is ejected from the gas discharge valve 20 even when the pressure exceeds the operating pressure of the gas discharge valve 20. Therefore, it is possible to measure the pressure up to a higher pressure.

実施例１．
露点−８０℃のアルゴンドライボックスに、電圧３．０Ｖの市販リチウムイオン電池(１)(容量３０Ａｈ)を入れ、この電池(１)の側面をマイクログラインダーで直径１２ｍｍの円形に開口した。その後、開口部に内径１２ｍｍ、外径１８ｍｍのガスケットを重ね、外径１２ｍｍの接続プラグ(１ａ)を接続し、この接続プラグ(１ａ)に配管(２)、及び圧力センサ(３ａ)、開閉バルブ(６)を予め接続した継ぎ手(コネクタ)(８)を接続した。配管(２)、圧力センサ(３ａ)、及び開閉バルブ(６)は各々真空ボックスで真空引きした後にアルゴンドライボックス内に入れて接続しておいた。 Example 1.
A commercially available lithium ion battery (1) having a voltage of 3.0 V (capacity 30 Ah) was placed in an argon dry box having a dew point of −80 ° C., and the side surface of the battery (1) was opened in a circular shape having a diameter of 12 mm with a micro grinder. Thereafter, a gasket having an inner diameter of 12 mm and an outer diameter of 18 mm is stacked on the opening, and a connection plug (1a) having an outer diameter of 12 mm is connected. The pipe (2), pressure sensor (3a), and open / close valve are connected to the connection plug (1a). A joint (connector) (8) to which (6) was previously connected was connected. The pipe (2), the pressure sensor (3a), and the opening / closing valve (6) were each evacuated in a vacuum box and then connected in an argon dry box.

この電池(１)を大気中に取り出し、圧力センサ(３ａ)と表示計(１００)を接続した。蓄電デバイス(１)に電圧計測用のケーブル(電圧検出器７)を接続し、温度検出用の熱電対(温度センサ５ａ，５ｂ)を貼付した。蓄電デバイス(１)近傍の配管には放熱フィン(４ａｂ)を取り付け、圧力センサ(３ａ)付近の配管(２)にはテープヒータ(４ａａ)を巻き、その外側を断熱材で覆った。このヒータ(４ａａ)の出力を温度管理器(４ｂ)で４０℃になるように調整した。充電状態の蓄電デバイス(１)に別のテープヒータを巻きつけ、このテープヒータを７℃／ｍｉｎの昇温速度で２００℃まで昇温した。この時の電圧(Ｖ)、温度(Ｔ)及び圧力(Ｐ)の関係を図５に示す。温度の上昇に従って電解液溶媒の揮発や電極表面における電解液の分解により徐々に内圧(Ｐ)が上昇し、電圧(Ｖ)降下に伴い蓄電デバイス内部に過大な電流が流れ、温度(Ｔ)が上昇しまた電解液の分解により急激に内圧(Ｐ)が増加し、ある一定圧力に到達すると、ガス放出弁(２０)が作動してガスが放出され、内圧が急激に低下している。   The battery (1) was taken out into the atmosphere, and the pressure sensor (3a) and the indicator (100) were connected. A voltage measurement cable (voltage detector 7) was connected to the electricity storage device (1), and thermocouples (temperature sensors 5a and 5b) for temperature detection were attached. A heat radiating fin (4ab) was attached to the pipe near the electric storage device (1), a tape heater (4aa) was wound around the pipe (2) near the pressure sensor (3a), and the outside was covered with a heat insulating material. The output of the heater (4aa) was adjusted to 40 ° C. by the temperature controller (4b). Another tape heater was wound around the charged electricity storage device (1), and the temperature of the tape heater was increased to 200 ° C. at a temperature increase rate of 7 ° C./min. FIG. 5 shows the relationship between voltage (V), temperature (T), and pressure (P) at this time. As the temperature rises, the internal pressure (P) gradually rises due to the volatilization of the electrolyte solvent and the decomposition of the electrolyte on the electrode surface. As the voltage (V) drops, an excessive current flows inside the electricity storage device, and the temperature (T) When the pressure rises and the internal pressure (P) suddenly increases due to the decomposition of the electrolytic solution and reaches a certain pressure, the gas release valve (20) is actuated to release the gas, and the internal pressure drops rapidly.

比較例１．
上記実施例１において、配管(２)を用いずに、圧力センサ(３ａ)を直接接続プラグ(１ａ)に取り付けたこと以外は全て、上記実施例１と同様にした時の電圧(Ｖ)、温度(Ｔ)及び圧力(Ｐ)の関係を図６に示す。図５の配管(２)を用いた場合と比較すると、圧力(Ｐ)が高く計測され、電圧(Ｖ)降下時の急激な圧力(Ｐ)増加により圧力センサ(３ａ)の測定限界を超えたため、測定不能となった。 Comparative Example 1
In Example 1, the voltage (V) was the same as in Example 1 except that the pressure sensor (3a) was directly attached to the connection plug (1a) without using the pipe (2). The relationship between temperature (T) and pressure (P) is shown in FIG. Compared to the case of using the pipe (2) in FIG. 5, the pressure (P) was measured higher, and the measurement limit of the pressure sensor (3a) was exceeded due to a sudden increase in pressure (P) when the voltage (V) dropped. It became impossible to measure.

以上の結果より、実施例１に示したように圧力測定部(３)を蓄電デバイス(１)から離れた位置に設置し、配管(２)の温度をコントロールすることにより正確な圧力(Ｐ)が測定できる。   From the above results, as shown in Example 1, the pressure measuring unit (3) is installed at a position away from the electricity storage device (1), and the temperature of the pipe (2) is controlled, so that the accurate pressure (P) Can be measured.

１ 蓄電デバイス、１ａ 接続プラグ、１ｂ 継ぎ手、２ 配管、３ 圧力検出部、３ａ 圧力検出器、３ｂ Ａ／Ｄ変換器、４ 温度管理部、４ａ 加温・冷却機構、４ａａ ヒータ、４ａｂ 放熱フィン、４ｂ 温度管理器、５ 温度検出部、５ａ，５ｂ 温度センサ、５ｃ 温度検出器、６ 開閉バルブ、７ 電圧検出器、８ ガス捕集容器、１０ コネクタ、１０ａ 分岐コネクタ、１１ ガス分析装置、１２ ガス流量調整弁、２０ ガス放出弁、１００ 測定制御装置。   DESCRIPTION OF SYMBOLS 1 Power storage device, 1a Connection plug, 1b Joint, 2 Piping, 3 Pressure detection part, 3a Pressure detector, 3b A / D converter, 4 Temperature management part, 4a Heating / cooling mechanism, 4aa heater, 4ab Radiation fin, 4b Temperature controller, 5 Temperature detector, 5a, 5b Temperature sensor, 5c Temperature detector, 6 Open / close valve, 7 Voltage detector, 8 Gas collection container, 10 Connector, 10a Branch connector, 11 Gas analyzer, 12 Gas Flow control valve, 20 gas release valve, 100 measurement control device.

Claims (8)

一端が蓄電デバイスに内部圧力が測定可能に接続された配管と、
前記配管の他端に接続されて前記蓄電デバイス内部の圧力を検出する圧力検出部と、
前記圧力検出部を含む前記配管を加熱または冷却して温度管理を行う温度管理部と、
を備えたことを特徴とする蓄電デバイスの圧力測定装置。 A pipe having one end connected to the electricity storage device so that the internal pressure can be measured;
A pressure detector connected to the other end of the pipe to detect the pressure inside the electricity storage device;
A temperature management unit that performs temperature management by heating or cooling the pipe including the pressure detection unit; and
A pressure measuring device for an electricity storage device, comprising: 前記配管の前記蓄電デバイス近傍に設けられた冷却機構をさらに備えることを特徴とする請求項１に記載の蓄電デバイスの圧力測定装置。   The pressure measuring device for an electricity storage device according to claim 1, further comprising a cooling mechanism provided near the electricity storage device of the pipe. 前記蓄電デバイス及び前記配管の温度を検出する温度検出部と、
前記温度検出部により検出された温度と前記圧力検出部により検出された圧力から発生ガスを定量化する測定制御装置と、
を備えたことを特徴とする請求項１に記載の蓄電デバイスの圧力測定装置。 A temperature detector for detecting the temperature of the electricity storage device and the piping;
A measurement control device for quantifying the generated gas from the temperature detected by the temperature detector and the pressure detected by the pressure detector;
The pressure measuring device for an electricity storage device according to claim 1, comprising: 前記蓄電デバイスと前記圧力検出部の間の前記配管に挿入された開閉バルブを備えたことを特徴とする請求項１に記載の蓄電デバイスの圧力測定装置。   The pressure measuring device for an electricity storage device according to claim 1, further comprising an opening / closing valve inserted into the pipe between the electricity storage device and the pressure detection unit. 前記蓄電デバイス及び前記配管の温度を検出する温度検出部と、
前記蓄電デバイスと前記圧力検出部の間の前記配管に挿入された開閉バルブと、
前記開閉バルブを間欠的に開閉して前記温度検出部と前記圧力検出部により前記蓄電デバイスの圧力と温度を測定する測定制御装置と、
を備えたことを特徴とする請求項１に記載の蓄電デバイスの圧力測定装置。 A temperature detector for detecting the temperature of the electricity storage device and the piping;
An on-off valve inserted in the pipe between the electricity storage device and the pressure detection unit,
A measurement control device that intermittently opens and closes the opening and closing valve and measures the pressure and temperature of the power storage device by the temperature detection unit and the pressure detection unit;
The pressure measuring device for an electricity storage device according to claim 1, comprising: 前記配管の取り付け位置が、前記蓄電デバイスのガス放出弁であることを特徴とする請求項１から５までのいずれか１項に記載の蓄電デバイスの圧力測定装置。   The pressure measuring device for an electricity storage device according to any one of claims 1 to 5, wherein the pipe is attached to a gas release valve of the electricity storage device. 前記蓄電デバイスの電圧を検出する電圧検出部と、温度を検出する温度検出部と、前記圧力検出部の圧力と前記電圧検出部の電圧と前記温度検出部の温度から前記蓄電デバイスの状態を測定する測定制御装置と、を備えたことを特徴とする請求項１に記載の蓄電デバイスの圧力測定装置。   A voltage detection unit that detects a voltage of the power storage device, a temperature detection unit that detects a temperature, a pressure of the pressure detection unit, a voltage of the voltage detection unit, and a temperature of the temperature detection unit, and measures the state of the power storage device The pressure measurement device for an electricity storage device according to claim 1, further comprising: a measurement control device that performs measurement. 配管の一端を蓄電デバイスの内部圧力が測定可能なように接続し、他端に前記蓄電デバイス内部の圧力を検出する圧力検出部を接続し、前記圧力検出部を含む前記配管を加熱または冷却して温度管理を行いながら前記蓄電デバイスの圧力測定を行う蓄電デバイスの圧力測定方法。   One end of the pipe is connected so that the internal pressure of the power storage device can be measured, and the other end is connected to a pressure detection unit that detects the pressure inside the power storage device, and the pipe including the pressure detection unit is heated or cooled. A pressure measuring method for the electricity storage device, wherein the pressure of the electricity storage device is measured while performing temperature control.
JP2012070970A 2012-03-27 2012-03-27 Pressure measuring apparatus for power storage device and method thereof Pending JP2013205044A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108827680A (en) * 2018-06-15 2018-11-16 中国电子科技集团公司第十八研究所 Device and method for testing performance of chemical heater
WO2020116851A1 (en) * 2018-12-03 2020-06-11 주식회사 엘지화학 Internal pressure measuring jig for cylindrical battery cell

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108827680A (en) * 2018-06-15 2018-11-16 中国电子科技集团公司第十八研究所 Device and method for testing performance of chemical heater
WO2020116851A1 (en) * 2018-12-03 2020-06-11 주식회사 엘지화학 Internal pressure measuring jig for cylindrical battery cell
US11824171B2 (en) 2018-12-03 2023-11-21 Lg Energy Solution, Ltd. Internal pressure measuring jig for cylindrical battery cell

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