JP2016194998A - Power storage element inspection method, power storage device inspection method, power storage element manufacturing method and power storage device manufacturing method - Google Patents
Power storage element inspection method, power storage device inspection method, power storage element manufacturing method and power storage device manufacturing method Download PDFInfo
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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
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- Y02E60/10—Energy storage using batteries
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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
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Abstract
Description
本発明は、充放電可能な蓄電素子の検査方法、充放電可能な蓄電素子を備えた蓄電装置の検査方法、前記蓄電素子の検査方法を用いた蓄電素子の製造方法、前記蓄電装置の検査方法を用いた蓄電装置の製造方法に関する。 The present invention relates to a method for inspecting a chargeable / dischargeable power storage element, a method for inspecting a power storage device including a chargeable / dischargeable power storage element, a method for manufacturing a power storage element using the method for inspecting a power storage element, and a method for inspecting the power storage device. The present invention relates to a method for manufacturing a power storage device using a battery.
従来から、マイクロショート（微短絡）の原因となる負極に析出した金属を検知する二次電池の検査方法が知られている（特許文献１参照）。具体的に、この検査方法は、先ず、二次電池の温度が−２５℃から１５℃までの範囲で該二次電池の初回充電を行った後、充放電を繰り返す。続いて、２５℃の環境下で二次電池をエージングさせる。そして、エージングの前後において二次電池の電圧をそれぞれ測定し、エージング前後の電圧差から正極と負極とのマイクロショートを検知する。 2. Description of the Related Art Conventionally, a method for inspecting a secondary battery that detects metal deposited on a negative electrode that causes a micro short circuit (fine short circuit) is known (see Patent Document 1). Specifically, in this inspection method, first, the secondary battery is charged for the first time in the range of −25 ° C. to 15 ° C., and then charging and discharging are repeated. Subsequently, the secondary battery is aged in an environment of 25 ° C. Then, the voltage of the secondary battery is measured before and after aging, and the micro short circuit between the positive electrode and the negative electrode is detected from the voltage difference before and after aging.
上記の検査方法では、マイクロショートに起因する電圧降下からマイクロショートが発生していることを検知している。このため、負極に析出した金属がセパレータを貫通して正極に到達していない場合には、マイクロショートが生じていないため、上記の検査方法によって、負極に析出している金属を検出することができない。 In the above inspection method, the occurrence of a micro short circuit is detected from a voltage drop caused by the micro short circuit. For this reason, when the metal deposited on the negative electrode does not pass through the separator and reaches the positive electrode, no micro short circuit has occurred, so that the metal deposited on the negative electrode can be detected by the above inspection method. Can not.
従って、より精度よく微短絡を検知できる二次電池等の検査法及び製造方法が望まれる。 Therefore, an inspection method and a manufacturing method of a secondary battery and the like that can detect a fine short circuit with higher accuracy are desired.
そこで、本発明は、微短絡をより精度よく検出できる蓄電素子の検査方法、蓄電素子を備えた蓄電装置の検査方法、蓄電素子の製造方法、及び蓄電装置の製造方法を提供することを目的とする。 Accordingly, an object of the present invention is to provide a storage element inspection method, a storage device inspection method, a storage element manufacturing method, and a storage device manufacturing method that can detect a micro short circuit with higher accuracy. To do.
本発明に係る蓄電素子の検査方法は、
セパレータと該セパレータを介して交互に積層された正極及び負極とを含む電極体、及び前記電極体を収容するケースを有する蓄電素子の前記ケースに対し、該ケースの外側から前記正極及び前記負極の積層方向に力を加えることと、
前記蓄電素子を冷却することと、
前記力が加えられ且つ前記冷却された状態の前記蓄電素子における電気的特性を測定することと、を備える。
An inspection method for a power storage device according to the present invention includes:
An electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator, and the case of the electricity storage device having a case for housing the electrode body, the positive electrode and the negative electrode are formed from the outside of the case. Applying force in the stacking direction;
Cooling the electricity storage element;
Measuring electrical characteristics of the storage element in the cooled state when the force is applied.
かかる構成によれば、ケースを介して電極体に前記積層方向の力が加わるため、正極と負極とが互いに接近し、これにより、正極と負極との間に金属（金属粉等）がある場合や、負極において金属が析出している場合（前記力が加わらない状態では正極と負極とが導通しない程度の金属がある若しくは析出している場合）等に正極と負極とを導通し（即ち、微短絡させ）、この状態で該蓄電素子の電気的特性を測定することによって微短絡を精度よく検出することができる。即ち、電極体に前記積層方向の力を加えることで、正極と負極との間に金属がある場合や、負極において金属が僅かに析出している場合に、これら金属に起因する微短絡を電極体において生じさせることができ、これにより、電気的特性を測定することで前記微短絡を検出することができる。 According to such a configuration, since the force in the stacking direction is applied to the electrode body through the case, the positive electrode and the negative electrode come close to each other, and there is a metal (metal powder or the like) between the positive electrode and the negative electrode. In addition, when the metal is deposited in the negative electrode (when there is metal deposited or deposited to such an extent that the positive electrode and the negative electrode do not conduct in the state where the force is not applied), the positive electrode and the negative electrode are conducted (that is, By measuring the electrical characteristics of the electricity storage element in this state, the fine short circuit can be detected with high accuracy. That is, by applying a force in the stacking direction to the electrode body, when there is a metal between the positive electrode and the negative electrode, or when a slight amount of metal is deposited on the negative electrode, a fine short circuit caused by these metals It can be generated in the body, whereby the fine short circuit can be detected by measuring electrical characteristics.
しかも、蓄電素子が冷却されてケース内の圧力が小さくなるため、ケースを介した前記積層方向の力が電極体により効率よく加わり、これにより、正極と負極との間に金属がある場合や、負極において金属が析出している場合等でも、これら金属に起因する微短絡をより確実に生じさせることができる。 In addition, since the power storage element is cooled and the pressure in the case is reduced, the force in the stacking direction through the case is more efficiently applied to the electrode body, thereby, when there is a metal between the positive electrode and the negative electrode, Even when a metal is deposited on the negative electrode, a fine short circuit caused by the metal can be generated more reliably.
この場合、
前記力を加えるときに、前記積層方向において前記ケースの両側に配置される一対の挟持部材と、前記積層方向に延び且つ前記一対の挟持部材同士を接続する金属製の接続部とによって、該力を前記ケースに加え、
前記冷却では、前記蓄電素子と共に前記一対の挟持部材及び前記接続部を冷却することがより好ましい。
in this case,
When applying the force, the force is applied by a pair of sandwiching members disposed on both sides of the case in the stacking direction, and a metal connection portion extending in the stacking direction and connecting the pair of sandwiching members. To the case,
In the cooling, it is more preferable to cool the pair of clamping members and the connection portion together with the power storage element.
かかる構成によれば、冷却によって金属製の接続部が縮むため、この接続部の縮みに起因する前記積層方向の力が一対の挟持部材から電極体に対して加わり、これにより、前記積層方向のより大きな力が電極体に加わる。このため、蓄電素子（電極体）において、正極と負極との間に僅かな金属がある場合や、負極に金属が僅かに析出している場合でも、これら金属に起因する微短絡を生じさせることができる。 According to such a configuration, the metal connection portion contracts due to cooling, and thus the force in the stacking direction due to the contraction of the connection portion is applied to the electrode body from the pair of sandwiching members. A greater force is applied to the electrode body. For this reason, in a power storage element (electrode body), even when there is a slight amount of metal between the positive electrode and the negative electrode or when a slight amount of metal is deposited on the negative electrode, a slight short circuit caused by these metals can occur. Can do.
また、本発明に係る蓄電装置の検査方法は、
セパレータと該セパレータを介して交互に積層された正極及び負極とを含む電極体、及び前記電極体を収容するケースを有する少なくとも一つの蓄電素子を備える蓄電装置において、前記蓄電素子の前記ケースに対し、該ケースの外側から前記正極及び前記負極の積層方向に力を加えることと、
前記蓄電素子を冷却することと、
前記力が加えられ且つ前記冷却された状態の前記蓄電素子における電気的特性を測定することと、を備える。
In addition, an inspection method for a power storage device according to the present invention includes:
In a power storage device including an electrode body including a separator and positive and negative electrodes alternately stacked via the separator, and at least one power storage element having a case for housing the electrode body, Applying force in the stacking direction of the positive electrode and the negative electrode from the outside of the case;
Cooling the electricity storage element;
Measuring electrical characteristics of the storage element in the cooled state when the force is applied.
かかる構成によれば、蓄電装置を構成する蓄電素子において、ケースを介して電極体に前記積層方向の力が加わるため、電極体において正極と負極とが互いに接近し、これにより、正極と負極との間に金属（金属粉等）がある場合や、該負極において金属が析出している場合（前記力が加わらない状態では正極と負極とが導通しない程度の金属がある若しくは析出している場合）等に正極と負極とを導通し（即ち、微短絡させ）、この状態で該蓄電素子の電気的特性を測定することによって該微短絡を精度よく検出することができる。即ち、蓄電装置を構成する蓄電素子の電極体に対し、前記積層方向の力を加えることで、該電極体において正極と負極との間に僅かな金属がある場合や、該電極体の負極において金属が僅かに析出している場合に、これら金属に起因する微短絡を生じさせることができ、これにより、電気的特性を測定することで前記微短絡を精度よく検出することができる。 According to such a configuration, in the power storage element constituting the power storage device, the force in the stacking direction is applied to the electrode body through the case, so that the positive electrode and the negative electrode approach each other in the electrode body. When there is a metal (metal powder, etc.) between the metal and when the metal is deposited on the negative electrode (when there is a metal that is not conductive between the positive electrode and the negative electrode when the force is not applied) ) Or the like is electrically connected to the positive electrode and the negative electrode (that is, short-circuited), and the electrical characteristics of the power storage element are measured in this state, whereby the micro-short-circuit can be detected with high accuracy. That is, by applying a force in the stacking direction to the electrode body of the power storage element constituting the power storage device, there is a slight metal between the positive electrode and the negative electrode in the electrode body, or in the negative electrode of the electrode body When the metal deposits slightly, it is possible to cause a fine short circuit due to the metal, and thereby the fine short circuit can be accurately detected by measuring electrical characteristics.
しかも、蓄電素子が冷却されてケース内の圧力が小さくなるため、ケースを介した前記積層方向の力が電極体により効率よく加わり、これにより、正極と負極との間に僅かな金属がある場合や、負極において僅かな金属が析出している場合等でも、これら金属に起因する微短絡をより確実に生じさせることができる。 In addition, since the electricity storage element is cooled and the pressure in the case is reduced, the force in the stacking direction through the case is more efficiently applied to the electrode body, and thus there is a slight metal between the positive electrode and the negative electrode Even when a slight amount of metal is deposited on the negative electrode, a fine short circuit caused by these metals can be generated more reliably.
前記蓄電装置の検査方法では、
前記蓄電装置は、複数の前記蓄電素子を備え、
前記力を加えるときに、前記複数の蓄電素子のそれぞれの前記ケースに対し、該ケースの外側から前記正極及び前記負極の積層方向に力を加え、
前記電気的特性の測定では、前記複数の蓄電素子のそれぞれの電気的特性を測定してもよい。
In the inspection method of the power storage device,
The power storage device includes a plurality of power storage elements,
When applying the force, for each case of the plurality of power storage elements, apply a force in the stacking direction of the positive electrode and the negative electrode from the outside of the case,
In the measurement of the electrical characteristics, the electrical characteristics of each of the plurality of power storage elements may be measured.
かかる構成によれば、蓄電装置を構成する複数の蓄電素子のそれぞれにおいて、正極と負極との間に金属がある場合や、負極に金属が析出している場合等に、これら金属に起因する微短絡を生じさせることができ、電気的特性の測定によって該微短絡を検出することができる。 According to such a configuration, in each of the plurality of power storage elements constituting the power storage device, when there is a metal between the positive electrode and the negative electrode, or when metal is deposited on the negative electrode, etc. A short circuit can be caused, and the fine short circuit can be detected by measuring electrical characteristics.
また、前記蓄電装置の検査方法では、
前記蓄電装置は、前記蓄電素子を保持する保持部材であって、前記積層方向において該蓄電素子の両側に配置される一対の終端部材、及び前記積層方向に延び且つ前記一対の終端部材同士を接続する金属製の接続部を有する保持部材を備え、
前記保持部材は、前記蓄電素子に前記力を加え、
前記冷却では、前記蓄電素子と共に前記保持部材を冷却してもよい。
Further, in the inspection method of the power storage device,
The power storage device is a holding member that holds the power storage element, the pair of termination members disposed on both sides of the power storage element in the stacking direction, and the pair of termination members that extend in the stacking direction and connect the pair of termination members A holding member having a metal connection part
The holding member applies the force to the power storage element,
In the cooling, the holding member may be cooled together with the power storage element.
かかる構成によれば、保持部材が電極体に対して前記積層方向の力を加えるため、即ち、保持部材による締め付け力を利用することによって、蓄電装置とは別途の挟持装置等を用いることなく、電極体に前記力を加えることができ、これにより、正極と負極との間に金属がある場合や、負極に金属が析出している場合に、これら金属に起因する微短絡をより確実に生じさせることができる。 According to such a configuration, the holding member applies a force in the stacking direction to the electrode body, that is, by using a clamping force by the holding member, without using a holding device or the like separate from the power storage device, The force can be applied to the electrode body, which can more reliably cause a fine short circuit due to the metal when there is a metal between the positive electrode and the negative electrode or when a metal is deposited on the negative electrode. Can be made.
しかも、冷却によって金属製の接続部が縮むため、この接続部の縮みに起因する前記積層方向の力も一対の終端部材からケースを介して電極体に対して加わり、これにより、前記積層方向のより大きな力が電極体に加わる。即ち、保持部材の冷却によって生じた接続部の縮みに起因する締め付け力を利用することによって、電極体に前記積層方向のより大きな力を加えることができる。このため、蓄電素子（電極体）において、正極と負極との間に僅かな金属がある場合や、負極に金属が僅かに析出している場合でも、これら金属に起因する微短絡を生じさせることができる。 In addition, since the metal connection portion shrinks due to cooling, the force in the stacking direction due to the shrinkage of the connection portion is also applied to the electrode body from the pair of terminal members through the case, thereby A large force is applied to the electrode body. That is, a larger force in the stacking direction can be applied to the electrode body by utilizing the tightening force resulting from the shrinkage of the connecting portion caused by the cooling of the holding member. For this reason, in a power storage element (electrode body), even when there is a slight amount of metal between the positive electrode and the negative electrode or when a slight amount of metal is deposited on the negative electrode, a slight short circuit caused by these metals can occur. Can do.
また、本発明に係る蓄電素子の製造方法は、
セパレータと該セパレータを介して交互に積層された正極及び負極とを含む電極体をケース内に収容して蓄電素子を形成することと、
前記蓄電素子の形成後、上記いずれかの蓄電素子の検査方法を行うことと、を備える。
In addition, a method for manufacturing a power storage device according to the present invention includes:
Accommodating an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator in a case to form a power storage element;
Performing any one of the above-described methods for inspecting a storage element after forming the storage element.
かかる構成によれば、正極と負極との間に金属がある場合や、負極に金属が析出している場合等に、これを微短絡として検出することができるため、前記金属がある状態の蓄電素子を使用することを防ぐことができる。 According to such a configuration, when there is a metal between the positive electrode and the negative electrode, or when a metal is deposited on the negative electrode, this can be detected as a fine short circuit. Use of the element can be prevented.
また、本発明に係る蓄電装置の製造方法は、
セパレータと該セパレータを介して交互に積層された正極及び負極とを含む電極体をケースに収容して蓄電素子を形成することと、
前記蓄電素子の形成後、上記いずれかの蓄電装置の検査方法を行うことと、を備える。
In addition, a method for manufacturing a power storage device according to the present invention includes:
Accommodating an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator in a case to form a storage element;
Performing any one of the above-described methods for inspecting a power storage device after forming the power storage element.
かかる構成によれば、蓄電装置を構成する蓄電素子の電極体において、正極と負極との間に金属がある場合や、負極に金属が析出している場合でも、これを微短絡として検出することができるため、前記金属がある状態の蓄電素子を備える蓄電装置を使用することを防ぐことができる。 According to such a configuration, even when there is a metal between the positive electrode and the negative electrode or when metal is deposited on the negative electrode in the electrode body of the power storage element constituting the power storage device, this can be detected as a fine short circuit. Therefore, the use of a power storage device including a power storage element in a state where the metal is present can be prevented.
以上より、本発明によれば、微短絡をより精度よく検出できる蓄電素子の検査方法、蓄電素子を備えた蓄電装置の検査方法、蓄電素子の製造方法、及び蓄電装置の製造方法を提供することができる。 As described above, according to the present invention, it is possible to provide a storage element inspection method, a storage device inspection method including a storage element, a storage element manufacturing method, and a storage apparatus manufacturing method capable of detecting a fine short circuit with higher accuracy. Can do.
以下、本発明の第一実施形態について、図１〜図９を参照しつつ説明する。尚、本実施形態を含む以下の各実施形態の各構成部材（各構成要素）の名称は、当該実施形態におけるものであり、背景技術における各構成部材（各構成要素）の名称と異なる場合がある。 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition, the name of each component (each component) of each following embodiment including this embodiment is in the said embodiment, and may differ from the name of each component (each component) in background art. is there.
以下では、先ず、検査対象である蓄電装置を説明し、その後、該蓄電装置の検査方法と、この検査方法を用いた蓄電装置の製造方法とを説明する。 In the following, first, a power storage device to be inspected will be described, and then a method for inspecting the power storage device and a method for manufacturing a power storage device using this inspection method will be described.
蓄電装置は、図１に示すように、少なくとも一つの蓄電素子１を備える。具体的に、蓄電装置は、複数の蓄電素子１と、蓄電素子１に隣り合う複数のスペーサ２と、複数の蓄電素子１及び複数のスペーサ２をひとまとめに保持する保持部材３と、を備える。保持部材３は、金属製である。このため、蓄電装置は、蓄電素子１と保持部材３との間に蓄電素子１と保持部材３とを絶縁するインシュレータ４を備える。 As shown in FIG. 1, the power storage device includes at least one power storage element 1. Specifically, the power storage device includes a plurality of power storage elements 1, a plurality of spacers 2 adjacent to the power storage elements 1, and a holding member 3 that holds the plurality of power storage elements 1 and the plurality of spacers 2 together. The holding member 3 is made of metal. For this reason, the power storage device includes an insulator 4 that insulates the power storage element 1 and the holding member 3 between the power storage element 1 and the holding member 3.
蓄電素子は、図２〜図５に示すように、正極５３及び負極５４を含む電極体５と、電極体５を収容するケース１０と、を備える。また、蓄電素子１は、電極体５及びケース１０の他に、ケース１０の外側に配置される外部端子１１、及び電極体５と外部端子１１とを導通させる集電体１２等を備える。 As shown in FIGS. 2 to 5, the power storage element includes an electrode body 5 including a positive electrode 53 and a negative electrode 54, and a case 10 that houses the electrode body 5. In addition to the electrode body 5 and the case 10, the power storage element 1 includes an external terminal 11 disposed outside the case 10, a current collector 12 that electrically connects the electrode body 5 and the external terminal 11, and the like.
電極体５は、巻芯５１と、正極５３と負極５４とが互いに絶縁された状態で積層された積層体５２であって、巻芯５１の周囲に巻回された積層体５２と、を備える。この電極体５においてリチウムイオンが正極５３と負極５４との間を移動することにより、蓄電素子１が充放電する。 The electrode body 5 includes a core 51 and a laminate 52 in which the positive electrode 53 and the negative electrode 54 are laminated in a state of being insulated from each other, and the laminate 52 wound around the core 51. . When the lithium ions move between the positive electrode 53 and the negative electrode 54 in the electrode body 5, the power storage element 1 is charged and discharged.
巻芯５１は、通常、絶縁材料によって形成される。巻芯５１は、筒形状である。本実施形態の巻芯５１は、偏平な筒形状である。本実施形態の巻芯５１は、可撓性又は熱可塑性を有するシートを巻回することによって形成される。 The winding core 51 is usually formed of an insulating material. The winding core 51 has a cylindrical shape. The core 51 of the present embodiment has a flat cylindrical shape. The winding core 51 of this embodiment is formed by winding a sheet having flexibility or thermoplasticity.
前記シートは、合成樹脂によって形成される。シートは、電解液に対して耐性を有する。シートは、例えば、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリフェニレンスルフィド（ＰＰＳ）、ポリエチレンテレフタラート（ＰＥＴ）によって構成される。本実施形態のシートは、例えば、ポリプロピレンによって構成される。巻芯５１を構成するシートの材料は、合成樹脂に限定されず、アルミニウム、銅等の金属でもよい。 The sheet is formed of a synthetic resin. The sheet is resistant to the electrolytic solution. The sheet is made of, for example, polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), or polyethylene terephthalate (PET). The sheet | seat of this embodiment is comprised by the polypropylene, for example. The material of the sheet constituting the winding core 51 is not limited to a synthetic resin, and may be a metal such as aluminum or copper.
積層体５２は、正極５３及び負極５４が積層された（重ねられた）状態で巻芯５１の周囲に巻回されることによって形成される。 The stacked body 52 is formed by being wound around the core 51 in a state where the positive electrode 53 and the negative electrode 54 are stacked (stacked).
正極５３は、金属箔と、金属箔の上に形成された正極活物質層と、を有する。金属箔は帯状である。本実施形態の金属箔は、例えば、アルミニウム箔である。正極５３は、帯形状の短手方向である幅方向の一方の端縁部に、正極活物質層の非被覆部（正極活物質層が形成されていない部位）５３１を有する。正極５３において正極活物質層が形成される部位を被覆部５３２と称する。 The positive electrode 53 includes a metal foil and a positive electrode active material layer formed on the metal foil. The metal foil is strip-shaped. The metal foil of this embodiment is an aluminum foil, for example. The positive electrode 53 has a non-covered portion of the positive electrode active material layer (a portion where the positive electrode active material layer is not formed) 531 at one edge in the width direction, which is the short direction of the band shape. A portion where the positive electrode active material layer is formed in the positive electrode 53 is referred to as a covering portion 532.
前記正極活物質層は、正極活物質と、バインダーと、を有する。 The positive electrode active material layer includes a positive electrode active material and a binder.
前記正極活物質は、例えば、リチウム金属酸化物である。具体的に、正極活物質は、例えば、ＬｉａＭｅｂＯｃ（Ｍｅは、１又は２以上の遷移金属を表す）によって表される複合酸化物（ＬｉａＣｏｙＯ２、ＬｉａＮｉｘＯ２、ＬｉａＭｎｚＯ４、ＬｉａＮｉｘＣｏｙＭｎｚＯ２等）、ＬｉａＭｅｂ（ＸＯｃ）ｄ（Ｍｅは、１又は２以上の遷移金属を表し、Ｘは例えばＰ、Ｓｉ、Ｂ、Ｖを表す）によって表されるポリアニオン化合物（ＬｉａＦｅｂＰＯ４、ＬｉａＭｎｂＰＯ４、ＬｉａＭｎｂＳｉＯ４、ＬｉａＣｏｂＰＯ４Ｆ等）である。本実施形態の正極活物質は、Ｌｉ１．０５Ｎｉ０．１６７Ｃｏ０．６６Ｍｎ０．１６７Ｏ２である。 The positive electrode active material is, for example, a lithium metal oxide. Specifically, the positive electrode active material is, for example, a composite oxide (Li a Co y O 2 , Li a Ni x ) represented by Li a Me b O c (Me represents one or more transition metals). O 2 , Li a Mn z O 4 , Li a Ni x Co y Mn z O 2, etc.), Li a Me b (XO c ) d (Me represents one or more transition metals, and X represents, for example, P , Si, B, a polyanion compounds represented by the representative of the V) (Li a Fe b PO 4, Li a Mn b PO 4, Li a Mn b SiO 4, Li a Co b PO 4 F , etc.). The positive electrode active material of the present embodiment is Li 1.05 Ni 0.167 Co 0.66 Mn 0.167 O 2 .
前記正極活物質層に用いられるバインダーは、例えば、ポリフッ化ビニリデン（ＰＶｄＦ）、エチレンとビニルアルコールとの共重合体、ポリメタクリル酸メチル、ポリエチレンオキサイド、ポリプロピレンオキサイド、ポリビニルアルコール、ポリアクリル酸、ポリメタクリル酸、スチレンブタジエンゴム（ＳＢＲ）である。本実施形態のバインダーは、ポリフッ化ビニリデンである。 Examples of the binder used in the positive electrode active material layer include polyvinylidene fluoride (PVdF), a copolymer of ethylene and vinyl alcohol, polymethyl methacrylate, polyethylene oxide, polypropylene oxide, polyvinyl alcohol, polyacrylic acid, and polymethacrylic acid. Acid, styrene butadiene rubber (SBR). The binder of this embodiment is polyvinylidene fluoride.
前記正極活物質層は、ケッチェンブラック（登録商標）、アセチレンブラック、黒鉛等の導電助剤をさらに有してもよい。本実施形態の正極活物質層は、導電助剤としてアセチレンブラックを有する。 The positive electrode active material layer may further include a conductive additive such as ketjen black (registered trademark), acetylene black, or graphite. The positive electrode active material layer of this embodiment has acetylene black as a conductive additive.
負極５４は、金属箔と、金属箔の上に形成された負極活物質層と、を有する。金属箔は帯状である。本実施形態の金属箔は、例えば、銅箔である。負極５４は、帯形状の短手方向である幅方向の他方（正極５３の非被覆部５３１と反対側）の端縁部に、負極活物質層の非被覆部（負極活物質層が形成されていない部位）５４１を有する。負極５４の被覆部（負極活物質層が形成される部位）５４２の幅は、正極５３の被覆部５３２の幅よりも大きい。 The negative electrode 54 includes a metal foil and a negative electrode active material layer formed on the metal foil. The metal foil is strip-shaped. The metal foil of this embodiment is a copper foil, for example. The negative electrode 54 has a non-covered portion of the negative electrode active material layer (negative electrode active material layer formed on the other edge in the width direction that is the short side direction of the band shape (the side opposite to the non-covered portion 531 of the positive electrode 53). (Parts not provided) 541. The width of the covering portion (the portion where the negative electrode active material layer is formed) 542 of the negative electrode 54 is larger than the width of the covering portion 532 of the positive electrode 53.
前記負極活物質層は、負極活物質と、バインダーと、を有する。 The negative electrode active material layer includes a negative electrode active material and a binder.
前記負極活物質は、例えば、グラファイト、難黒鉛化炭素、及び易黒鉛化炭素などの炭素材、又は、ケイ素（Ｓｉ）及び錫（Ｓｎ）などのリチウムイオンと合金化反応を生じる材料である。本実施形態の負極活物質は、難黒鉛化炭素である。 The negative electrode active material is, for example, a material that causes an alloying reaction with carbon materials such as graphite, non-graphitizable carbon, and graphitizable carbon, or lithium ions such as silicon (Si) and tin (Sn). The negative electrode active material of this embodiment is non-graphitizable carbon.
負極活物質層に用いられるバインダーは、正極活物質層に用いられたバインダーと同様のものである。本実施形態のバインダーは、ポリフッ化ビニリデンである。 The binder used for the negative electrode active material layer is the same as the binder used for the positive electrode active material layer. The binder of this embodiment is polyvinylidene fluoride.
前記負極活物質層は、ケッチェンブラック（登録商標）、アセチレンブラック、黒鉛等の導電助剤をさらに有してもよい。本実施形態の負極活物質層は、導電助剤を有していない。 The negative electrode active material layer may further include a conductive additive such as ketjen black (registered trademark), acetylene black, or graphite. The negative electrode active material layer of this embodiment does not have a conductive additive.
本実施形態の電極体５では、以上のように構成される正極５３と負極５４とがセパレータ５５によって絶縁された状態で巻回されている。即ち、本実施形態の電極体５では、正極５３、負極５４、及びセパレータ５５の積層体５２が巻回される。 In the electrode body 5 of the present embodiment, the positive electrode 53 and the negative electrode 54 configured as described above are wound in a state where they are insulated by the separator 55. That is, in the electrode body 5 of the present embodiment, the laminate 52 of the positive electrode 53, the negative electrode 54, and the separator 55 is wound.
セパレータ５５は、絶縁性を有する部材である。セパレータ５５は、正極５３と負極５４との間に配置される。これにより、電極体５（詳しくは、積層体５２）において、正極５３と負極５４とが互いに絶縁される。また、セパレータ５５は、ケース１０内において、電解液を保持する。これにより、蓄電素子１の充放電時において、リチウムイオンが、セパレータ５５を介して（挟んで）交互に積層される正極５３と負極５４との間を移動する。 The separator 55 is an insulating member. The separator 55 is disposed between the positive electrode 53 and the negative electrode 54. Thereby, in the electrode body 5 (specifically, the laminated body 52), the positive electrode 53 and the negative electrode 54 are insulated from each other. The separator 55 holds the electrolytic solution in the case 10. Thereby, at the time of charging / discharging of the electrical storage element 1, lithium ion moves between the positive electrode 53 and the negative electrode 54 which are alternately laminated via the separator 55.
セパレータ５５は、帯状である。セパレータ５５は、例えば、ポリエチレン、ポリプロピレン、セルロース、ポリアミドなどの多孔質膜によって構成される。セパレータ５５は、ＳｉＯ２粒子、Ａｌ２Ｏ３粒子、ベーマイト（アルミナ水和物）等の無機粒子を含んだ無機層を、多孔質膜によって形成された基材の上に設けることで形成されてもよい。本実施形態のセパレータ５５は、例えば、ポリエチレンによって形成される。セパレータの幅（帯形状の短手方向の寸法）は、負極５４の被覆部５４２の幅より僅かに大きい。セパレータ５５は、被覆部５３２同士が重なるように幅方向に位置ずれした状態で重ね合わされた正極５３と負極５４との間に配置される。このとき、正極５３の非被覆部５３１と負極５４の非被覆部５４１とは重なっていない。即ち、正極５３の非被覆部５３１が、正極５３と負極５４との重なる領域から幅方向に突出し、且つ、負極５４の非被覆部５４１が、正極５３と負極５４との重なる領域から幅方向（正極５３の非被覆部５３１の突出方向と反対の方向）に突出する。積層された状態の正極５３、負極５４、及びセパレータ５５、即ち、積層体５２が巻回されることによって、電極体５が形成される。正極５３の非被覆部５３１又は負極５４の非被覆部５４１のみが積層された部位によって、電極体５における非被覆積層部５６が構成される。 The separator 55 has a strip shape. Separator 55 is constituted by porous membranes, such as polyethylene, polypropylene, cellulose, polyamide, for example. The separator 55 is formed by providing an inorganic layer containing inorganic particles such as SiO 2 particles, Al 2 O 3 particles, boehmite (alumina hydrate) on a substrate formed of a porous film. Also good. The separator 55 of the present embodiment is made of polyethylene, for example. The width of the separator (the dimension of the strip shape in the short direction) is slightly larger than the width of the covering portion 542 of the negative electrode 54. The separator 55 is disposed between the positive electrode 53 and the negative electrode 54 that are overlapped in a state of being displaced in the width direction so that the covering portions 532 overlap each other. At this time, the non-covered portion 531 of the positive electrode 53 and the non-covered portion 541 of the negative electrode 54 do not overlap. That is, the non-covered portion 531 of the positive electrode 53 protrudes in the width direction from the region where the positive electrode 53 and the negative electrode 54 overlap, and the non-covered portion 541 of the negative electrode 54 extends from the region where the positive electrode 53 and the negative electrode 54 overlap in the width direction ( It protrudes in a direction opposite to the protruding direction of the non-covered portion 531 of the positive electrode 53. The electrode body 5 is formed by winding the stacked positive electrode 53, negative electrode 54, and separator 55, that is, the stacked body 52. The portion where only the uncoated portion 531 of the positive electrode 53 or the uncoated portion 541 of the negative electrode 54 is stacked constitutes the uncoated stacked portion 56 in the electrode body 5.
非被覆積層部５６は、電極体５の各極に設けられる。即ち、正極５３の非被覆部５３１のみが積層された非被覆積層部５６が電極体５における正極の非被覆積層部を構成し、負極５４の非被覆部５４１のみが積層された非被覆積層部５６が電極体５における負極の非被覆積層部を構成する。 The uncoated laminated portion 56 is provided on each electrode of the electrode body 5. That is, the non-coated laminated part 56 in which only the non-coated part 531 of the positive electrode 53 is laminated constitutes the non-coated laminated part of the positive electrode in the electrode body 5, and the non-coated laminated part in which only the non-coated part 541 of the negative electrode 54 is laminated. 56 constitutes an uncoated laminated portion of the negative electrode in the electrode body 5.
以上のように構成される電極体５は、正極５３、負極５４、及びセパレータ５５が略真っ直ぐ延びた状態で積層されている平坦部５７と、正極５３、負極５４、及びセパレータ５５が湾曲した状態で積層されている湾曲部５８と、を有する。そして、電極体５は、平坦部５７をＸ軸方向（正極５３等の積層方向）からケース１０（詳しくは、後述する一対の長壁部１００ｃ間）に挟み込まれるように該ケース１０に収容されている。 In the electrode body 5 configured as described above, the positive electrode 53, the negative electrode 54, and the separator 55 are stacked in a state where the positive electrode 53, the negative electrode 54, and the separator 55 extend substantially straight, and the positive electrode 53, the negative electrode 54, and the separator 55 are curved. And a curved portion 58 that is laminated. The electrode body 5 is accommodated in the case 10 so that the flat portion 57 is sandwiched between the case 10 (specifically, between a pair of long wall portions 100c described later) from the X-axis direction (stacking direction of the positive electrode 53 and the like). Yes.
ケース１０は、開口を有するケース本体１００と、ケース本体１００の開口を塞ぐ（閉じる）蓋板１０１と、を有する。ケース１０は、電極体５及び集電体１２等と共に、電解液を内部空間１３（図４参照）に収容する。ケース１０は、電解液に耐性を有する金属によって形成される。本実施形態のケース１０は、例えば、アルミニウム、又は、アルミニウム合金等のアルミニウム系金属材料によって形成される。 The case 10 includes a case main body 100 having an opening and a lid plate 101 that closes (closes) the opening of the case main body 100. The case 10 houses the electrolytic solution in the internal space 13 (see FIG. 4) together with the electrode body 5, the current collector 12, and the like. The case 10 is formed of a metal having resistance to the electrolytic solution. The case 10 of the present embodiment is formed of, for example, an aluminum metal material such as aluminum or an aluminum alloy.
前記電解液は、非水溶液系電解液である。電解液は、有機溶媒に電解質塩を溶解させることによって得られる。有機溶媒は、例えば、プロピレンカーボネート及びエチレンカーボネートなどの環状炭酸エステル類、ジメチルカーボネート、ジエチルカーボネート、及びエチルメチルカーボネートなどの鎖状カーボネート類である。電解質塩は、ＬｉＣｌＯ４、ＬｉＢＦ４、及びＬｉＰＦ６等である。本実施形態の電解液は、プロピレンカーボネート、ジメチルカーボネート、及びエチルメチルカーボネートを、プロピレンカーボネート：ジメチルカーボネート：エチルメチルカーボネート＝３：２：５の割合で調整した混合溶媒に、１ｍｏｌ／ＬのＬｉＰＦ６を溶解させたものである。 The electrolytic solution is a non-aqueous electrolytic solution. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. Examples of the organic solvent include cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. The electrolyte salt is LiClO 4 , LiBF 4 , LiPF 6 or the like. The electrolyte solution of this embodiment is prepared by mixing 1 mol / L LiPF 6 in a mixed solvent in which propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate are adjusted at a ratio of propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5. Is dissolved.
ケース１０は、ケース本体１００の開口周縁部１０２と、蓋板１０１の周縁部とを重ね合わせた状態で接合することによって形成される。また、ケース１０は、ケース本体１００と蓋板１０１とによって画定される内部空間１３を有する。本実施形態では、ケース本体１００の開口周縁部１０２と蓋板１０１の周縁部とは、溶接によって接合される。 The case 10 is formed by joining the opening peripheral edge portion 102 of the case main body 100 and the peripheral edge portion of the cover plate 101 in an overlapped state. The case 10 has an internal space 13 defined by the case main body 100 and the lid plate 101. In this embodiment, the opening peripheral part 102 of the case main body 100 and the peripheral part of the cover plate 101 are joined by welding.
ケース本体１００は、板状の閉塞部１００ａと、閉塞部１００ａの周縁に接続される筒状の胴部１００ｂとを備える。 The case main body 100 includes a plate-like closing part 100a and a cylindrical body part 100b connected to the periphery of the closing part 100a.
閉塞部１００ａは、開口が上を向くようにケース本体１００が配置されたときに、ケース本体１００の下端に位置する（即ち、前記開口が上を向いたときのケース本体１００の底壁となる）部位である。閉塞部１００ａは、該閉塞部１００ａの法線方向視において、矩形状である。 The closed portion 100a is located at the lower end of the case body 100 when the case body 100 is arranged so that the opening faces upward (that is, the bottom wall of the case body 100 when the opening faces upward). ) Part. The obstruction | occlusion part 100a is rectangular shape in the normal line view of this obstruction | occlusion part 100a.
以下では、図３に示すように、閉塞部１００ａの短辺方向を直交座標におけるＸ軸方向とし、閉塞部１００ａの長辺方向を直交座標におけるＹ軸方向とし、閉塞部１００ａの法線方向（厚さ方向）を直交座標におけるＺ軸方向とする。 In the following, as shown in FIG. 3, the short side direction of the closed portion 100a is the X-axis direction in the orthogonal coordinates, the long side direction of the closed portion 100a is the Y-axis direction in the orthogonal coordinates, and the normal direction of the closed portion 100a ( (Thickness direction) is defined as the Z-axis direction in orthogonal coordinates.
本実施形態の胴部１００ｂは、偏平な角筒形状を有する。胴部１００ｂは、閉塞部１００ａの周縁における長辺から延びる一対の長壁部１００ｃと、閉塞部１００ａの周縁における短辺から延びる一対の短壁部１００ｄとを有する。即ち、一対の長壁部１００ｃは、Ｙ軸方向に間隔（詳しくは、閉塞部１００ａの周縁における短辺に相当する間隔）をあけて対向し、一対の短壁部１００ｄは、Ｙ軸方向に間隔（詳しくは、閉塞部１００ａの周縁における長辺に相当する間隔）をあけて対向する。短壁部１００ｄが一対の長壁部１００ｃの対応（詳しくは、Ｘ軸方向に対向）する端部同士をそれぞれ接続することによって、角筒状の胴部１００ｂが形成される。 The trunk portion 100b of the present embodiment has a flat rectangular tube shape. The trunk | drum 100b has a pair of long wall part 100c extended from the long side in the periphery of the obstruction | occlusion part 100a, and a pair of short wall part 100d extended from the short side in the periphery of the obstruction | occlusion part 100a. That is, the pair of long wall portions 100c oppose each other with a gap in the Y-axis direction (specifically, a gap corresponding to the short side of the periphery of the closing portion 100a), and the pair of short wall portions 100d are spaced in the Y-axis direction. (In detail, they are opposed to each other with an interval corresponding to the long side of the periphery of the closed portion 100a). By connecting the end portions of the short wall portion 100d corresponding to the pair of long wall portions 100c (specifically, facing the X-axis direction), a rectangular tube-shaped body portion 100b is formed.
以上のように、ケース本体１００は、開口方向（Ｚ軸方向）における一方の端部が塞がれた角筒形状（即ち、有底角筒形状）を有する。 As described above, the case main body 100 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end portion in the opening direction (Z-axis direction) is closed.
蓋板１０１は、ケース本体１００の開口を塞ぐ板状の部材である。具体的に、蓋板１０１は、ケース本体１００の開口を塞ぐようにケース本体１００に当接する。この蓋板１０１は、Ｚ軸方向視において、ケース本体１００の開口周縁部１０２に対応した輪郭形状を有する。即ち、蓋板１０１は、Ｚ軸方向視において、Ｙ軸方向に長い矩形状の板材である。 The lid plate 101 is a plate-like member that closes the opening of the case body 100. Specifically, the cover plate 101 contacts the case main body 100 so as to close the opening of the case main body 100. The cover plate 101 has a contour shape corresponding to the opening peripheral edge portion 102 of the case body 100 when viewed in the Z-axis direction. That is, the cover plate 101 is a rectangular plate material that is long in the Y-axis direction when viewed in the Z-axis direction.
外部端子１１は、他の蓄電素子の外部端子又は外部機器等と電気的に接続される部位である。外部端子１１は、導電性を有する部材によって形成される。例えば、外部端子１１は、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料、銅又は銅合金等の銅系金属材料等の溶接性の高い金属材料によって形成される。この外部端子１１は、バスバ等が溶接可能な面１１０を有する。本実施形態の面１１０は、平面である。 The external terminal 11 is a part that is electrically connected to an external terminal of another power storage element or an external device. The external terminal 11 is formed of a conductive member. For example, the external terminal 11 is formed of a metal material having high weldability such as an aluminum-based metal material such as aluminum or aluminum alloy, or a copper-based metal material such as copper or copper alloy. The external terminal 11 has a surface 110 to which a bus bar or the like can be welded. The surface 110 of this embodiment is a flat surface.
集電体１２は、ケース１０内に配置され、電極体５と通電可能に直接又は間接に接続される。集電体１２は、導電性を有する部材によって形成され、ケース１０の内面に沿って配置される。本実施形態の蓄電素子１では、ケース１０内において、電極体５の正極非被覆積層部５６と、負極非被覆積層部５６とにそれぞれ配置される。 The current collector 12 is disposed in the case 10 and is directly or indirectly connected to the electrode body 5 so as to be energized. The current collector 12 is formed of a conductive member and is disposed along the inner surface of the case 10. In the electricity storage device 1 of the present embodiment, the case 10 is disposed in the positive electrode uncoated stacked portion 56 and the negative electrode uncoated stacked portion 56 of the electrode body 5.
正極の集電体１２と負極の集電体１２とは、異なる材料によって形成される。具体的に、正極の集電体１２は、例えば、アルミニウム又はアルミニウム合金によって形成され、負極の集電体１２は、例えば、銅又は銅合金によって形成される。 The positive electrode current collector 12 and the negative electrode current collector 12 are formed of different materials. Specifically, the positive electrode current collector 12 is formed of, for example, aluminum or an aluminum alloy, and the negative electrode current collector 12 is formed of, for example, copper or a copper alloy.
蓄電素子１は、電極体５とケース１０とを絶縁する絶縁部材１４等を備える。本実施形態の絶縁部材１４は、例えば、絶縁カバーである。絶縁部材１４は、ケース１０（詳しくはケース本体１００）と電極体５との間に配置される（図４参照）。絶縁部材１４は、絶縁性を有するシート状の部材によって構成される。本実施形態の絶縁部材１４は、例えば、ポリプロピレン、ポリフェニレンスルフィド等の樹脂によって形成される。本実施形態の絶縁部材１４は、所定の形状に裁断された絶縁性を有するシート状の部材を折り曲げることによって袋状に形成される。本実施形態の蓄電素子１では、袋状の絶縁部材１４に収容された状態の電極体５（詳しくは、電極体５及び集電体１２）がケース１０内に収容される。 The power storage element 1 includes an insulating member 14 that insulates the electrode body 5 from the case 10. The insulating member 14 of this embodiment is an insulating cover, for example. The insulating member 14 is disposed between the case 10 (specifically, the case body 100) and the electrode body 5 (see FIG. 4). The insulating member 14 is configured by a sheet-like member having insulating properties. Insulating member 14 of this embodiment is formed with resin, such as polypropylene and polyphenylene sulfide, for example. The insulating member 14 of the present embodiment is formed into a bag shape by bending an insulating sheet-like member cut into a predetermined shape. In the electricity storage device 1 of the present embodiment, the electrode body 5 (specifically, the electrode body 5 and the current collector 12) accommodated in the bag-like insulating member 14 is accommodated in the case 10.
スペーサ２は、絶縁性を有し、図１及び図６に示すようにＸ軸方向において蓄電素子１と隣接する。スペーサ２は、蓄電素子１（詳しくは、ケース１０、より詳しくは、胴部１００ｂの長壁部１００ｃ）と隣接するベースと、該ベースに隣接する蓄電素子１の位置ずれを防止する規制部とを有する。 The spacer 2 has insulating properties and is adjacent to the power storage element 1 in the X-axis direction as shown in FIGS. 1 and 6. The spacer 2 includes a base adjacent to the power storage element 1 (specifically, the case 10, more specifically, the long wall portion 100c of the body 100b), and a restricting portion that prevents displacement of the power storage element 1 adjacent to the base. Have.
スペーサ２について、より具体的に説明する。蓄電装置は、２種類のスペーサ２（２Ａ，２Ｂ）を備える。具体的に、蓄電装置は、二つの蓄電素子１間に配置される内部スペーサ２Ａと、複数の蓄電素子１のうちの最も端にある蓄電素子１に隣り合う外部スペーサ２Ｂとを備える。 The spacer 2 will be described more specifically. The power storage device includes two types of spacers 2 (2A, 2B). Specifically, the power storage device includes an internal spacer 2 </ b> A disposed between two power storage elements 1 and an external spacer 2 </ b> B adjacent to the power storage element 1 at the end of the plurality of power storage elements 1.
内部スペーサ２Ａは、蓄電素子１（詳しくは、ケース本体１００の長壁部１００ｃ）に隣り合うベース２０Ａと、ベース２０Ａと隣り合う蓄電素子１の該ベース２０Ａに対するＹ軸方向及びＺ軸方向の移動（位置ずれ）を規制する規制部２１Ａと、を有する。 The inner spacer 2A includes a base 20A adjacent to the power storage element 1 (specifically, the long wall portion 100c of the case body 100), and movement of the power storage element 1 adjacent to the base 20A in the Y-axis direction and the Z-axis direction ( And a regulating portion 21A that regulates (positional deviation).
内部スペーサ２Ａのベース２０Ａは、隣り合う二つの蓄電素子１に挟み込まれる。即ち、内部スペーサ２Ａのベース２０ＡのＸ軸方向の両側に、蓄電素子１がそれぞれ配置されている。このベース２０Ａは、該ベース２０ＡとＸ軸方向において隣接する蓄電素子１（詳しくは、長壁部１００ｃ）に沿って拡がる。本実施形態のベース２０Ａは、Ｘ軸方向と直交する方向（Ｙ−Ｚ平面（Ｙ軸とＺ軸を含む平面）方向）に拡がる。このベース２０Ａは、蓄電素子１の長壁部１００ｃと対応する大きさである。 The base 20A of the inner spacer 2A is sandwiched between two adjacent power storage elements 1. That is, the power storage elements 1 are respectively disposed on both sides of the base 20A of the inner spacer 2A in the X-axis direction. The base 20A extends along the power storage element 1 (specifically, the long wall portion 100c) adjacent to the base 20A in the X-axis direction. The base 20A of the present embodiment extends in a direction (YZ plane (plane including the Y axis and Z axis) direction) orthogonal to the X axis direction. The base 20 </ b> A has a size corresponding to the long wall portion 100 c of the electricity storage device 1.
本実施形態の内部スペーサ２Ａのベース２０Ａは、該ベース２０Ａと蓄電素子１との間に、冷却流体（冷却用の流体）を通過させるための通風路２０３を形成する。 The base 20 </ b> A of the internal spacer 2 </ b> A of the present embodiment forms a ventilation path 203 for allowing a cooling fluid (cooling fluid) to pass between the base 20 </ b> A and the power storage element 1.
規制部２１Ａは、Ｘ軸方向の両側にある蓄電素子１の内部スペーサ２Ａ（ベース２０Ａ）に対するＹ−Ｚ平面方向の位置ずれを抑える（規制する）。これにより、規制部２１Ａは、内部スペーサ２Ａに隣接する二つの蓄電素子１同士のＹ−Ｚ平面方向への相対移動を規制できる。具体的に、規制部２１Ａは、ベース２０からＸ軸方向の両側にそれぞれ延びる。この規制部２１Ａが蓄電素子１の四隅を保持する（拘束する）ことによって、蓄電素子１の内部スペーサ２Ａ（ベース２０Ａ）に対するＹ−Ｚ平面方向の位置ずれが規制される。 The restricting portion 21A suppresses (regulates) positional deviation in the YZ plane direction with respect to the internal spacer 2A (base 20A) of the power storage element 1 on both sides in the X-axis direction. Thereby, 21 A of control parts can control the relative movement to the YZ plane direction of the two electrical storage elements 1 adjacent to 2 A of internal spacers. Specifically, the restricting portion 21A extends from the base 20 to both sides in the X-axis direction. When the restricting portion 21A holds (restrains) the four corners of the power storage element 1, the displacement of the power storage element 1 in the YZ plane direction with respect to the inner spacer 2A (base 20A) is restricted.
本実施形態の蓄電装置は、上述のように、複数の蓄電素子１を備え、内部スペーサ２Ａは、隣り合う蓄電素子１同士の間のそれぞれに配置されている。このため、本実施形態の蓄電装置は、複数の内部スペーサ２Ａを備える。 As described above, the power storage device of the present embodiment includes a plurality of power storage elements 1, and the internal spacers 2 </ b> A are disposed between the adjacent power storage elements 1. For this reason, the power storage device of this embodiment includes a plurality of internal spacers 2A.
外部スペーサ２Ｂは、蓄電素子１とＸ軸方向において隣接するベース２０Ｂと、該ベース２０Ｂに隣接する蓄電素子１の該ベース２０Ｂに対する位置ずれを抑える規制部２１Ｂとを有する。本実施形態の外部スペーサ２Ｂは、隣接する蓄電素子１との間に、冷却用の流体を通過させるための通風路２０３を形成する。 The outer spacer 2B includes a base 20B adjacent to the power storage element 1 in the X-axis direction, and a restricting portion 21B that suppresses displacement of the power storage element 1 adjacent to the base 20B with respect to the base 20B. The external spacer 2 </ b> B of the present embodiment forms an air passage 203 for allowing a cooling fluid to pass between the adjacent power storage elements 1.
外部スペーサ２Ｂのベース２０Ｂは、該ベース２０ＢとＸ軸方向において隣接する蓄電素子１（詳しくは、長壁部１００ｃ）に沿って拡がる。本実施形態のベース２０Ｂは、Ｙ−Ｚ平面方向に拡がる。外部スペーサ２Ｂのベース２０Ｂは、蓄電素子１の長壁部１００ｃと略同等の大きさである。 The base 20B of the outer spacer 2B extends along the power storage element 1 (specifically, the long wall portion 100c) adjacent to the base 20B in the X-axis direction. The base 20B of the present embodiment extends in the YZ plane direction. The base 20 </ b> B of the outer spacer 2 </ b> B is approximately the same size as the long wall portion 100 c of the electricity storage device 1.
規制部２１Ｂは、外部スペーサ２Ｂと隣り合う蓄電素子１のベース２０Ｂに対する位置ずれ（相対移動）を規制する。規制部２１Ｂは、外部スペーサ２Ｂのベース２０Ｂから、該ベース２０Ｂと隣り合う蓄電素子１に向かって延びる。この規制部２１Ｂが蓄電素子１の四隅を保持する（拘束する）ことによって、蓄電素子１の外部スペーサ２Ｂ（ベース２０Ｂ）に対するＹ−Ｚ平面方向の位置ずれが規制される。 The restricting portion 21B restricts displacement (relative movement) of the power storage element 1 adjacent to the external spacer 2B with respect to the base 20B. The restricting portion 21B extends from the base 20B of the outer spacer 2B toward the power storage element 1 adjacent to the base 20B. When the restricting portion 21B holds (restrains) the four corners of the electricity storage device 1, the displacement of the electricity storage device 1 in the YZ plane direction with respect to the external spacer 2B (base 20B) is restricted.
以上のように構成される外部スペーサ２Ｂは、Ｘ軸方向において、蓄電素子１と保持部材３との間に配置される。このとき、外部スペーサ２Ｂは、保持部材３（詳しくは、後述する終端部材３０）との間にも、冷却用の流体を通過させるための通風路２０３を形成する。 The external spacer 2B configured as described above is disposed between the power storage element 1 and the holding member 3 in the X-axis direction. At this time, the external spacer 2 </ b> B also forms a ventilation path 203 for allowing a cooling fluid to pass between the holding member 3 (specifically, a terminating member 30 described later).
本実施形態の蓄電装置は、一対の外部スペーサ２Ｂを備える。一対の外部スペーサ２Ｂのそれぞれは、複数の蓄電素子１のうちの最も端にある蓄電素子１に隣り合う。即ち、一対の外部スペーサ２Ｂは、整列する複数の蓄電素子１をＸ軸方向において挟み込むように配置される。 The power storage device of this embodiment includes a pair of external spacers 2B. Each of the pair of external spacers 2B is adjacent to the power storage element 1 at the end of the plurality of power storage elements 1. That is, the pair of external spacers 2B are arranged so as to sandwich the plurality of aligned storage elements 1 in the X-axis direction.
保持部材３は、蓄電素子１とスペーサ２とをＸ軸方向に締め込む（即ち、電極体５の平坦部５７における正極５３、負極５４、及びセパレータ５５の積層方向（以下、単に「正極５３等の積層方向」と称する。）に挟み込む）ように保持する。具体的に、保持部材３は、図１及び図６に示すように、Ｘ軸方向において、整列する複数の蓄電素子１の両側に配置される一対の終端部材３０と、該一対の終端部材３０同士を接続するフレーム３１とを備える。 The holding member 3 fastens the power storage element 1 and the spacer 2 in the X-axis direction (that is, the stacking direction of the positive electrode 53, the negative electrode 54, and the separator 55 in the flat portion 57 of the electrode body 5 (hereinafter simply referred to as “positive electrode 53 etc. It is held in such a manner as to be sandwiched in the “stacking direction” of FIG. Specifically, as illustrated in FIGS. 1 and 6, the holding member 3 includes a pair of termination members 30 disposed on both sides of the plurality of power storage elements 1 aligned in the X-axis direction, and the pair of termination members 30. And a frame 31 connecting the two.
一対の終端部材３０のそれぞれは、蓄電素子１（詳しくは、長壁部１００ｃ）に沿って拡がる。本実施形態の終端部材３０は、Ｙ−Ｚ平面方向に拡がる。各終端部材３０は、外部スペーサ２Ｂと対向する。本実施形態の終端部材３０は、Ｘ軸方向視において略矩形状（蓄電素子１と対応する形状）である。 Each of the pair of termination members 30 extends along the power storage element 1 (specifically, the long wall portion 100c). The termination member 30 of the present embodiment extends in the YZ plane direction. Each termination member 30 faces the outer spacer 2B. The terminating member 30 of the present embodiment has a substantially rectangular shape (a shape corresponding to the power storage element 1) when viewed in the X-axis direction.
フレーム３１は、一対の終端部材３０同士を接続する接続部３１０、３１１を有する。具体的に、フレーム３１は、内部スペーサ２Ａを介してＸ軸方向に並ぶ複数の蓄電素子１のそれぞれの角部に沿って延びる複数（本実施形態の例では二つ）の接続部３１０、３１１を有する。本実施形態の保持部材３は、Ｙ軸方向の一端と他端とにフレーム３１を有する。一対のフレーム３１のそれぞれは、蓄電素子１の蓋板１０１と対応する位置に配置される第一接続部３１０と、蓄電素子１の閉塞部１００ａと対応する位置に配置される第二接続部３１１とを有する。第一接続部３１０は、Ｘ軸方向に延びる。第二接続部３１１も、第一接続部３１０と同様に、Ｘ軸方向に延びる。また、フレーム３１は、第一接続部３１０と第二接続部３１１とを接続する支持部３１２を有する。支持部３１２は、Ｙ軸方向において蓄電素子１に対して同じ側にある一対の接続部（第一接続部３１０及び第二接続部３１１）の対応する端部同士を接続する。また、フレーム３１は、Ｚ軸方向に隣り合う第一接続部３１０と第二接続部３１１との中間部同士を接続する補強部３１４を有する。 The frame 31 includes connection portions 310 and 311 that connect the pair of termination members 30 to each other. Specifically, the frame 31 includes a plurality (two in the example of the present embodiment) of connecting portions 310 and 311 extending along respective corners of the plurality of power storage elements 1 arranged in the X-axis direction via the internal spacer 2A. Have The holding member 3 of the present embodiment has frames 31 at one end and the other end in the Y-axis direction. Each of the pair of frames 31 includes a first connection part 310 disposed at a position corresponding to the cover plate 101 of the power storage element 1 and a second connection part 311 disposed at a position corresponding to the closing part 100 a of the power storage element 1. And have. The first connection part 310 extends in the X-axis direction. Similarly to the first connection portion 310, the second connection portion 311 extends in the X-axis direction. Further, the frame 31 has a support portion 312 that connects the first connection portion 310 and the second connection portion 311. The support portion 312 connects corresponding end portions of a pair of connection portions (first connection portion 310 and second connection portion 311) on the same side with respect to the power storage element 1 in the Y-axis direction. In addition, the frame 31 includes a reinforcing portion 314 that connects intermediate portions between the first connection portion 310 and the second connection portion 311 that are adjacent in the Z-axis direction.
以上のように構成されるフレーム３１のＸ軸方向の両端部（詳しくは、第一接続部３１０と第二接続部３１１の両端部）が一対の終端部材３０に固定される。このとき、第一接続部３１０及び第二接続部３１１は、フレーム３１が一対の終端部材３０に接続されたときに該一対の終端部材３０がＸ軸方向に並ぶ複数の蓄電素子１を同方向に締め込むような長さ寸法に設定されている。このため、各終端部材３０は、外部スペーサ２ＢをＸ軸方向に押圧する。これにより、Ｘ軸方向に並ぶ各蓄電素子１において、一対の長壁部１００ｃのそれぞれに対して内部空間１３側への力が加わる。このとき、上述のように、電極体５は、平坦部５７が該平坦部５７における正極５３等の積層方向において一対の長壁部１００ｃに挟み込まれるようにケース１０内に収容（配置）されている。このため、平坦部５７は、正極５３等の積層方向（本実施形態の例ではＸ軸方向）の力が加わった状態となっている。 Both ends of the frame 31 configured as described above in the X-axis direction (specifically, both ends of the first connecting portion 310 and the second connecting portion 311) are fixed to the pair of termination members 30. At this time, when the frame 31 is connected to the pair of termination members 30, the first connection portion 310 and the second connection portion 311 have the plurality of power storage elements 1 arranged in the X-axis direction in the same direction when the frame 31 is connected to the pair of termination members 30. The length is set so that it is tightened. For this reason, each termination | terminus member 30 presses the outer spacer 2B to a X-axis direction. Thereby, in each electrical storage element 1 arranged in the X-axis direction, a force toward the internal space 13 is applied to each of the pair of long wall portions 100c. At this time, as described above, the electrode body 5 is accommodated (arranged) in the case 10 so that the flat portion 57 is sandwiched between the pair of long wall portions 100c in the stacking direction of the positive electrode 53 and the like in the flat portion 57. . For this reason, the flat portion 57 is in a state where a force in the stacking direction of the positive electrode 53 and the like (in the example of the present embodiment, the X-axis direction) is applied.
また、フレーム３１は、上述のように金属製であり、冷却されることによって僅かに収縮する。 Further, the frame 31 is made of metal as described above, and slightly contracts when cooled.
インシュレータ４は、絶縁性を有する材料で構成され、蓄電素子１と保持部材３との間を絶縁する。本実施形態の蓄電装置は、図１及び図６に示すように、一対のインシュレータ４を備える。一対のインシュレータ４のそれぞれは、第一接続部３１０とスペーサ２（内部スペーサ２Ａの規制部２１Ａ及び外部スペーサ２Ｂの規制部２１Ｂ）との間に配置される第一絶縁部４０と、第二接続部３１１とスペーサ２（内部スペーサ２Ａの規制部２１Ａ及び外部スペーサ２Ｂの規制部２１Ｂ）との間に配置される第二絶縁部４１とを有する。また、インシュレータ４は、第一絶縁部４０と第二絶縁部４１とを接続する第三絶縁部であって、外部スペーサ２Ｂと、フレーム３１の支持部３１２との間に配置される第三絶縁部４２を有する。さらに、インシュレータ４は、第一絶縁部４０の途中位置と第二絶縁部４１の途中位置とを接続する第四絶縁部４３であって、蓄電素子１とフレーム３１の補強部３１４との間に配置される第四絶縁部４３を有する。 The insulator 4 is made of an insulating material and insulates between the electricity storage element 1 and the holding member 3. The power storage device of the present embodiment includes a pair of insulators 4 as shown in FIGS. 1 and 6. Each of the pair of insulators 4 includes a first insulating portion 40 disposed between the first connecting portion 310 and the spacer 2 (the restricting portion 21A of the inner spacer 2A and the restricting portion 21B of the outer spacer 2B), and a second connection. A second insulating portion 41 disposed between the portion 311 and the spacer 2 (the restricting portion 21A of the inner spacer 2A and the restricting portion 21B of the outer spacer 2B). The insulator 4 is a third insulating part that connects the first insulating part 40 and the second insulating part 41, and is a third insulating part disposed between the outer spacer 2 </ b> B and the support part 312 of the frame 31. Part 42. Furthermore, the insulator 4 is a fourth insulating part 43 that connects the midway position of the first insulating part 40 and the midway position of the second insulating part 41, and is between the power storage element 1 and the reinforcing part 314 of the frame 31. It has the 4th insulating part 43 arrange | positioned.
次に、蓄電装置の製造方法について、図７〜図９も参照しつつ説明する。 Next, a method for manufacturing the power storage device will be described with reference to FIGS.
正極５３、負極５４、及びセパレータ５５が巻回された電極体５がケース本体１００内に配置された状態で、ケース本体１００の開口部が蓋板１０１によって塞がれる（密閉される）。このとき、外部端子１１、集電体１２、及び絶縁部材１４等も所定の位置にそれぞれ配置又は組み付けられている。これにより、蓄電素子１が形成される（ステップＳ１）。 With the electrode body 5 around which the positive electrode 53, the negative electrode 54, and the separator 55 are wound disposed in the case main body 100, the opening of the case main body 100 is closed (sealed) by the cover plate 101. At this time, the external terminal 11, the current collector 12, the insulating member 14, and the like are also arranged or assembled at predetermined positions. Thereby, the electrical storage element 1 is formed (step S1).
次に、複数の蓄電素子１と複数のスペーサ２とがＸ軸方向に交互に並べられ、この並べられた状態の複数の蓄電素子１及び複数のスペーサ２をひとまとめに保持部材３に保持させる。これにより、蓄電装置の組み立て工程が終了する（ステップＳ２）。 Next, the plurality of power storage elements 1 and the plurality of spacers 2 are alternately arranged in the X-axis direction, and the plurality of power storage elements 1 and the plurality of spacers 2 in the arranged state are collectively held by the holding member 3. Thereby, the assembly process of an electrical storage apparatus is complete | finished (step S2).
蓄電装置の組み立て工程が終了すると、蓄電装置の検査が行われる。この検査は、蓄電素子１の組み立て時等において電極体５内に混入した金属（例えば、正極５３、負極５４等を切断等したときに生じた金属粉、製造装置の摩耗クズ、構成部材を組み付けるときの摩耗クズ等の金属）の有無や、これら金属が負極５４に析出しているか否かを調べる（ステップＳ３）。具体的には、以下の通りである。 When the assembly process of the power storage device is completed, the power storage device is inspected. This inspection is performed by assembling metal (for example, metal powder generated when the positive electrode 53, the negative electrode 54, etc. are cut, the wear debris of the manufacturing apparatus, and the constituent members) mixed in the electrode body 5 when the power storage element 1 is assembled. And the presence or absence of these metals deposited on the negative electrode 54 (step S3). Specifically, it is as follows.
先ず、図８に示すように、蓄電装置を恒温槽等の雰囲気温度の管理が可能な試験室７０等に配置し、各蓄電素子１の電気的特性を測定できるように、蓄電装置を構成する各蓄電素子１の外部端子１１に導線等をそれぞれ接続する（ステップＳ３１）。このとき、蓄電装置の各蓄電素子１は充電された状態である。ここで、電気的特性とは、蓄電素子１において電気的に測定される特性であれば限定されず、例えば、電圧、電気抵抗等が挙げられる。本実施形態では、電圧を測定する。 First, as shown in FIG. 8, the power storage device is arranged in a test chamber 70 or the like capable of managing the ambient temperature such as a thermostatic bath, and the power storage device is configured so that the electrical characteristics of each power storage element 1 can be measured. A conducting wire or the like is connected to the external terminal 11 of each power storage element 1 (step S31). At this time, each power storage element 1 of the power storage device is in a charged state. Here, the electrical characteristic is not limited as long as it is a characteristic that is electrically measured in the power storage element 1, and examples thereof include voltage, electrical resistance, and the like. In this embodiment, the voltage is measured.
続いて、試験室７０の温度を下げて蓄電装置を冷却する（ステップＳ３２）。所定の温度（本実施形態の例では、１０℃以下の所定の温度）まで試験室７０の温度が下がると、検査終了までこの温度が維持される。 Subsequently, the temperature of the test chamber 70 is lowered to cool the power storage device (step S32). When the temperature of the test chamber 70 is lowered to a predetermined temperature (a predetermined temperature of 10 ° C. or less in the example of the present embodiment), this temperature is maintained until the end of the inspection.
蓄電装置が試験室７０の温度程度まで十分に冷却され、該蓄電装置の温度が安定すると、各蓄電素子１の電圧（第一の電圧）を測定し（ステップＳ３３）、測定された各蓄電素子１の第一の電圧を記録する。本実施形態の検査方法では、各蓄電素子１の第一の電圧は、前記導線が接続された検査装置７１等の記録部（ハードディスク、メモリ等）７２に記録される。 When the power storage device is sufficiently cooled to about the temperature of the test chamber 70 and the temperature of the power storage device is stabilized, the voltage (first voltage) of each power storage element 1 is measured (step S33), and each measured power storage element is measured. Record the first voltage of 1. In the inspection method of the present embodiment, the first voltage of each power storage element 1 is recorded in a recording unit (hard disk, memory, etc.) 72 such as the inspection device 71 to which the conducting wire is connected.
次に、第一の電圧が測定されてから所定の期間（本実施形態の例では０．８日以上且つ３日以下の所定の期間）の経過後に、各蓄電素子１の電圧（第二の電圧）を測定する（ステップＳ３４）。尚、少なくとも第一の電圧の測定から第二の電圧の測定までの間、試験室７０の温度は、前記所定の温度に維持されている。 Next, after the elapse of a predetermined period (a predetermined period of 0.8 days or more and 3 days or less in the example of the present embodiment) after the first voltage is measured, the voltage (second Voltage) is measured (step S34). Note that the temperature of the test chamber 70 is maintained at the predetermined temperature at least from the measurement of the first voltage to the measurement of the second voltage.
各蓄電素子１の第二の電圧が測定されると、前記検査装置７１等は、この測定された第二の電圧と対応する第一の電圧を前記記録部から引き出し、これら第一の電圧と第二の電圧とから（即ち、同じ蓄電素子１から測定された第一の電圧と第二の電圧とから）、当該第一及び第二の電圧が測定された蓄電素子１において微短絡が生じているか否かの判断を行う（ステップＳ３５）。本実施形態の検査装置７１等は、第一の電圧が測定されたときから第二の電圧が測定されたときまでの蓄電素子１における電圧降下を求め、この電圧降下が所定値（閾値）より大きいときに、該蓄電素子１において微短絡が発生していると判断する。 When the second voltage of each power storage element 1 is measured, the inspection device 71 or the like extracts the first voltage corresponding to the measured second voltage from the recording unit, From the second voltage (that is, from the first voltage and the second voltage measured from the same power storage element 1), a short circuit occurs in the power storage element 1 from which the first and second voltages are measured. It is determined whether or not (step S35). The inspection device 71 or the like of the present embodiment obtains a voltage drop in the electric storage element 1 from the time when the first voltage is measured to the time when the second voltage is measured, and this voltage drop is based on a predetermined value (threshold). When it is large, it is determined that a slight short circuit has occurred in the electricity storage element 1.
この微短絡は、負極５４に析出した金属に起因するものである。具体的には、以下の通りである。蓄電素子１の製造時において、蓄電素子１の製造設備の金属摩耗クズ等の金属不純物（以下、単に「金属」とも称する。）が電極体５の内部（詳しくは、正極５３近傍）に混入すると、該電極体５を備えた蓄電素子１が充電されたときに正極５３の電位によって不純物の一部が溶解する。そして、この溶解した金属は、電解液中を拡散して負極５４に到達し、負極５４の電位によって析出する。このように、正極５３と負極５４との間に混入した金属（金属粉、金属摩耗クズ等）や、負極５４において析出した金属がセパレータ５５を貫通して正極５３と負極５４とを導通させることで微短絡が発生する。 This fine short circuit is caused by the metal deposited on the negative electrode 54. Specifically, it is as follows. When manufacturing the electricity storage element 1, metal impurities (hereinafter also simply referred to as “metal”) such as metal wear debris of the facility for manufacturing the electricity storage element 1 are mixed inside the electrode body 5 (specifically, in the vicinity of the positive electrode 53). A part of the impurities is dissolved by the potential of the positive electrode 53 when the electricity storage device 1 including the electrode body 5 is charged. The dissolved metal diffuses in the electrolytic solution and reaches the negative electrode 54, and is deposited by the potential of the negative electrode 54. In this way, the metal (metal powder, metal wear debris, etc.) mixed between the positive electrode 53 and the negative electrode 54 or the metal deposited on the negative electrode 54 penetrates the separator 55 and makes the positive electrode 53 and the negative electrode 54 conductive. A slight short circuit occurs.
上述の蓄電装置の検査において微短絡が発生していると判断された蓄電素子１が、取り替えられ、これにより、蓄電装置が完成する。 The power storage element 1 that is determined to have a slight short circuit in the above-described inspection of the power storage device is replaced, thereby completing the power storage device.
以上の蓄電装置の検査方法によれば、蓄電装置を構成する蓄電素子１において、保持部材３により、ケース１０を介して電極体５（詳しくは平坦部５７）にＸ軸方向（平坦部５７における正極５３等の積層方向）の力が加わっている。このため、電極体５において正極５３と負極５４とが互いに接近し、これにより、正極５３と負極５４との間にある金属や、負極５４において析出している金属（前記力が加わらない状態では正極５３と負極５４とが導通しない程度の金属がある場合）等が正極５３と接触し（即ち、微短絡し）、この状態で所定間隔をおいて測定された第一の電圧と第二の電圧とから前記金属に起因する微短絡を精度よく検出することができる。即ち、蓄電装置を構成する蓄電素子１の電極体５に対し、正極５３等の積層方向の力を加えることで、電極体５において正極５３と負極５４との間にある金属や負極５４において僅かに析出している金属に起因する微短絡を生じさせることができ、この微短絡を第一の電圧と第二の電圧とから検出することができる。その結果、該蓄電素子１の正極５３と負極５４との間にある金属や負極５４において析出している金属等を精度よく検出することができる。 According to the above method for inspecting a power storage device, in the power storage element 1 constituting the power storage device, the holding member 3 causes the electrode body 5 (specifically, the flat portion 57) to pass through the case 10 in the X-axis direction (in the flat portion 57). A force in the stacking direction of the positive electrode 53 and the like is applied. For this reason, in the electrode body 5, the positive electrode 53 and the negative electrode 54 approach each other, so that the metal between the positive electrode 53 and the negative electrode 54 or the metal deposited on the negative electrode 54 (in the state where the force is not applied). The positive electrode 53 and the negative electrode 54 are in a state in which the metal does not conduct) or the like is in contact with the positive electrode 53 (that is, slightly short-circuited), and the first voltage and the second voltage measured at a predetermined interval in this state From the voltage, it is possible to accurately detect a fine short circuit caused by the metal. That is, by applying a force in the stacking direction of the positive electrode 53 or the like to the electrode body 5 of the power storage element 1 constituting the power storage device, the metal between the positive electrode 53 and the negative electrode 54 in the electrode body 5 or the negative electrode 54 is slightly changed. It is possible to cause a fine short circuit due to the metal deposited on the first electrode, and to detect the fine short circuit from the first voltage and the second voltage. As a result, it is possible to accurately detect the metal between the positive electrode 53 and the negative electrode 54 of the power storage element 1, the metal deposited on the negative electrode 54, and the like.
本実施形態の蓄電装置の検査方法では、保持部材３によってＸ軸方向に並ぶ複数の蓄電素子１が締め込まれることで、各蓄電素子１のケース１０（詳しくは該ケース１０を介して電極体５の平坦部５７）に対し、電極体５の積層方向の内側へ向かう力が加わっている。このため、蓄電装置を構成する複数の蓄電素子１のそれぞれにおいて、正極５３と負極５４との間にある金属や、負極５４に析出している金属を精度よく検出することができる。 In the method for inspecting a power storage device according to the present embodiment, the plurality of power storage elements 1 arranged in the X-axis direction are tightened by the holding member 3, so that the case 10 of each power storage element 1 (specifically, the electrode body via the case 10). 5 is applied with a force toward the inner side of the electrode body 5 in the stacking direction. For this reason, in each of the some electrical storage element 1 which comprises an electrical storage apparatus, the metal which exists between the positive electrode 53 and the negative electrode 54, and the metal which has precipitated on the negative electrode 54 can be detected accurately.
また、本実施形態の蓄電装置の検査方法では、保持部材３が電極体５（平坦部５７）に対してＸ軸方向（平坦部５７における正極５３等の積層方向）の力を加えるため、即ち、保持部材３による締め付け力を利用することによって、蓄電装置とは別途の挟持装置（締め付け装置）等を用いることなく、電極体５に前記力を加えることができる。これにより、正極５３と負極５４との間にある金属や、負極５４に析出している金属等の検出を精度よく行うことができる。 Further, in the inspection method of the power storage device of the present embodiment, the holding member 3 applies a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) to the electrode body 5 (flat portion 57). By using the clamping force by the holding member 3, the force can be applied to the electrode body 5 without using a clamping device (clamping device) separate from the power storage device. Accordingly, it is possible to accurately detect the metal between the positive electrode 53 and the negative electrode 54, the metal deposited on the negative electrode 54, and the like.
また、本実施形態の蓄電装置の検査方法では、蓄電装置全体を冷却しているため、蓄電装置を構成する蓄電素子１が冷却されてケース１０内の圧力が小さくなる。このため、ケース１０を介したＸ軸方向（平坦部５７における正極５３等の積層方向）の力が電極体５により効率よく加わる。しかも、冷却によって金属製の接続部３１０、３１１が縮むため、この接続部３１０、３１１の縮みに起因するＸ軸方向（前記積層方向）の力も一対の終端部材３０から電極体５に対して加わる。これにより、Ｘ軸方向（前記積層方向）のより大きな力が電極体５に加わる。即ち、保持部材３の冷却によって生じた接続部３１０、３１１の縮み起因する締め付け力を利用することによって、電極体５にＸ軸方向（前記積層方向）のより大きな力を加えることができる。このため、蓄電素子１（電極体５）において、正極５３と負極５４との間に僅かに金属がある場合や、負極５４に金属が僅かに析出している場合に、これら金属に起因する微短絡を生じさせることができ、その結果、前記金属をより精度よく検出することができる。 Further, in the power storage device inspection method of the present embodiment, since the entire power storage device is cooled, the power storage element 1 constituting the power storage device is cooled and the pressure in the case 10 is reduced. For this reason, a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) through the case 10 is efficiently applied to the electrode body 5. In addition, since the metal connection portions 310 and 311 are contracted by cooling, a force in the X-axis direction (the stacking direction) due to the contraction of the connection portions 310 and 311 is also applied to the electrode body 5 from the pair of termination members 30. . Thereby, a greater force in the X-axis direction (the stacking direction) is applied to the electrode body 5. That is, a larger force in the X-axis direction (the stacking direction) can be applied to the electrode body 5 by using the tightening force resulting from the shrinkage of the connection portions 310 and 311 caused by the cooling of the holding member 3. For this reason, in the electricity storage device 1 (electrode body 5), when there is a slight amount of metal between the positive electrode 53 and the negative electrode 54, or when a slight amount of metal is deposited on the negative electrode 54, the fineness caused by these metals A short circuit can be caused, and as a result, the metal can be detected more accurately.
また、本実施形態の蓄電装置の製造方法では、蓄電装置の組み立て工程の後に、上述の検査（負極５４に析出している金属の検出）を行うため、蓄電装置を構成する蓄電素子１の電極体５における正極５３と負極５４との間に金属がある場合や、負極５４に金属が析出している場合において、これら金属を精度よく検出することができる。このため、正極５３と負極５４との間に金属がある状態や、負極５４に金属が析出した状態の蓄電素子１を備える蓄電装置を使用することを防ぐことができる。 Further, in the method for manufacturing the power storage device of the present embodiment, the electrode of the power storage element 1 constituting the power storage device is provided after the assembly process of the power storage device to perform the above-described inspection (detection of metal deposited on the negative electrode 54). When there is a metal between the positive electrode 53 and the negative electrode 54 in the body 5 or when a metal is deposited on the negative electrode 54, these metals can be detected with high accuracy. For this reason, it can prevent using the electrical storage apparatus provided with the electrical storage element 1 in the state with a metal between the positive electrode 53 and the negative electrode 54, or the state in which the metal deposited on the negative electrode 54.
次に、本発明の第二実施形態について、図１０〜図１２を参照しつつ説明する。具体的に、本実施形態では、蓄電素子１の検査方法と、この検査方法を用いた蓄電素子１の製造方法とについて説明する。尚、本実施形態の検査対象である蓄電素子１は、上記第一実施形態の蓄電素子１と同じ構成である。 Next, a second embodiment of the present invention will be described with reference to FIGS. Specifically, in the present embodiment, a method for inspecting the electricity storage device 1 and a method for manufacturing the electricity storage device 1 using this inspection method will be described. In addition, the electrical storage element 1 which is a test target of the present embodiment has the same configuration as the electrical storage element 1 of the first embodiment.
先ず、蓄電素子１を恒温槽等の雰囲気温度の管理が可能な試験室等に配置し、電圧を測定できるように、蓄電素子１の外部端子１１に導線等を接続する（ステップＳ１１）。このとき、蓄電素子１は、充電された状態である。また、蓄電素子１は、図１２に示すように、挟持（締め付け）装置８０によって、Ｘ軸方向（平坦部５７における正極５３等の積層方向）に締め付けられた状態で試験室等に配置される（ステップＳ１２）。尚、ステップＳ１１とステップＳ１２とは、順序が逆でもよく、同時に行われてもよい。 First, the electricity storage device 1 is placed in a test chamber or the like capable of managing the ambient temperature, such as a thermostat, and a lead wire or the like is connected to the external terminal 11 of the electricity storage device 1 so that the voltage can be measured (step S11). At this time, the electric storage element 1 is in a charged state. Further, as shown in FIG. 12, the power storage element 1 is arranged in a test chamber or the like while being clamped in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) by a clamping (tightening) device 80. (Step S12). Note that the order of step S11 and step S12 may be reversed or may be performed simultaneously.
ここで、挟持装置８０によれば、蓄電素子１に対し、Ｘ軸方向（平坦部５７における正極５３等の積層方向）の力を加え続けることができる。即ち、挟持装置８０は、蓄電素子１をＸ軸方向に挟持し続けることができる。この挟持装置８０は、蓄電素子１が配置されたときに、Ｘ軸方向（平坦部５７における正極５３等の積層方向）においてケース１０の両側に配置される一対の挟持部材８１と、Ｘ軸方向に延び且つ一対の挟持部材８１同士を直接又は間接に接続する金属製の接続部８２と、を備える。また、挟持装置８０は、回転操作部８３を回転操作することにより、一対の挟持部材８１の間隔を調整する間隔調整機構８４を備える。 Here, according to the sandwiching device 80, a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) can be continuously applied to the power storage element 1. That is, the clamping device 80 can continue to clamp the power storage element 1 in the X-axis direction. The sandwiching device 80 includes a pair of sandwiching members 81 disposed on both sides of the case 10 in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) when the power storage element 1 is disposed, and the X-axis direction. And a metal connection portion 82 that directly or indirectly connects the pair of sandwiching members 81 to each other. The clamping device 80 also includes an interval adjustment mechanism 84 that adjusts the interval between the pair of clamping members 81 by rotating the rotation operation unit 83.
ステップＳ１２以降は、第一実施形態における蓄電装置の検査方法と同様である。具体的には以下の通りである。 Step S12 and subsequent steps are the same as the method for inspecting a power storage device in the first embodiment. Specifically, it is as follows.
試験室を所定の温度（本実施形態の例では、１０℃以下の所定の温度）まで下げて蓄電素子１を冷却する（ステップＳ１３）。蓄電素子１が十分に冷却された後、蓄電素子１の電圧（第一の電圧）を測定し（ステップＳ１４）、第一の電圧が測定されてから所定の期間（本実施形態の例では０．８日以上且つ３日以下の所定の期間）の経過後に、蓄電素子１の電圧（第二の電圧）を測定する（ステップＳ１５）。第一の電圧と第二の電圧とから蓄電素子１において微短絡が生じているか否かの判断を行う（ステップＳ１６）。本実施形態の蓄電素子の検査方法では、第一実施形態の蓄電装置の検査方法と同様に、第一の電圧が測定されたときから第二の電圧が測定されたときまでの蓄電素子１における電圧降下が所定値（閾値）より大きいときに、該蓄電素子１において微短絡が発生していると判断する。 The test chamber is lowered to a predetermined temperature (predetermined temperature of 10 ° C. or lower in the example of the present embodiment) to cool the power storage device 1 (step S13). After the storage element 1 is sufficiently cooled, the voltage (first voltage) of the storage element 1 is measured (step S14), and a predetermined period (0 in the example of this embodiment) is measured after the first voltage is measured. After a lapse of a predetermined period of 8 days or more and 3 days or less), the voltage (second voltage) of the storage element 1 is measured (step S15). It is determined from the first voltage and the second voltage whether or not a slight short circuit has occurred in the storage element 1 (step S16). In the storage element inspection method of the present embodiment, in the storage element 1 from when the first voltage is measured to when the second voltage is measured, similarly to the inspection method of the storage device of the first embodiment. When the voltage drop is larger than a predetermined value (threshold value), it is determined that a slight short circuit has occurred in the electricity storage element 1.
以上の蓄電素子１の検査方法は、例えば以下に示すように、蓄電素子１の製造方法に用いられる。 The above-described inspection method for the electricity storage device 1 is used in a method for manufacturing the electricity storage device 1 as described below, for example.
正極５３、負極５４、及びセパレータ５５が巻回された電極体５がケース本体１００内に配置された状態で、ケース本体１００の開口部が蓋板１０１によって塞がれる（密閉される）。このとき、外部端子１１、集電体１２、及び絶縁部材１４等も所定の位置にそれぞれ配置又は組み付けられている。これにより、蓄電素子１が形成される（ステップＳ２１）。 With the electrode body 5 around which the positive electrode 53, the negative electrode 54, and the separator 55 are wound disposed in the case main body 100, the opening of the case main body 100 is closed (sealed) by the cover plate 101. At this time, the external terminal 11, the current collector 12, the insulating member 14, and the like are also arranged or assembled at predetermined positions. Thereby, the electrical storage element 1 is formed (step S21).
蓄電素子１の組み立て工程が終了すると、上述の蓄電素子１の検査、即ち、蓄電素子１の組み立て時等において電極体５内に金属が混入したか否かや、負極５４に金属が析出しているか否かを調べる（ステップＳ２２）。この検査において微短絡が発生していると判断された蓄電素子１は、不良品として、出荷等されない。一方、前記検査において微短絡が発生していないと判断された蓄電素子１は、完成品として出荷等される。 When the assembly process of the storage element 1 is completed, whether or not a metal is mixed in the electrode body 5 during the above-described inspection of the storage element 1, that is, when the storage element 1 is assembled, It is checked whether or not there is (step S22). The storage element 1 that is determined to have a slight short circuit in this inspection is not shipped as a defective product. On the other hand, the electrical storage element 1 determined that no fine short circuit has occurred in the inspection is shipped as a finished product.
以上の蓄電素子１の検査方法によれば、挟持装置８０によって、ケース１０を介して電極体５（詳しくは平坦部５７）にＸ軸方向（平坦部５７における正極５３等の積層方向）の力が加わるため、正極５３と負極５４とが互いに接近し、正極５３と負極５４との間に金属がある場合や負極５４に金属が析出している場合（前記力が加わらない状態では正極５３と負極５４とを導通させない程度の金属がある場合）に正極５３と負極５４とを導通させる（即ち、微短絡する）。この微短絡した状態で所定間隔をおいて測定された第一の電圧と第二の電圧とから前記金属を精度よく検知することができる。即ち、電極体５にＸ軸方向（前記積層方向）の力を加えることで、正極５３と負極５４との間にある僅かな金属や、負極５４において僅かに析出している金属に起因する微短絡を電極体５において生じさせ、この微短絡を第一の電圧と第二の電圧とから検出することによって、負極５４に析出した金属を精度よく検出することができる。 According to the inspection method of the electricity storage device 1 described above, the force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) is applied to the electrode body 5 (specifically, the flat portion 57) by the clamping device 80 via the case 10. Therefore, when the positive electrode 53 and the negative electrode 54 come close to each other and there is a metal between the positive electrode 53 and the negative electrode 54 or when metal is deposited on the negative electrode 54 (in the state where the force is not applied, the positive electrode 53 and The positive electrode 53 and the negative electrode 54 are electrically connected (that is, they are slightly short-circuited) when there is a metal that does not electrically connect the negative electrode 54). The metal can be accurately detected from the first voltage and the second voltage measured at a predetermined interval in the state of being slightly short-circuited. That is, by applying a force in the X-axis direction (the stacking direction) to the electrode body 5, a slight amount of metal caused by a slight amount of metal between the positive electrode 53 and the negative electrode 54 or a slight amount of metal deposited on the negative electrode 54. By causing a short circuit in the electrode body 5 and detecting this fine short circuit from the first voltage and the second voltage, the metal deposited on the negative electrode 54 can be accurately detected.
本実施形態の蓄電素子１の検査方法では、第一の電圧の測定から第二の電圧の測定までの間、蓄電素子１を冷却しているため、ケース１０内の圧力が小さくなる。このため、ケース１０を介した挟持装置８０によるＸ軸方向（平坦部５７における正極５３等の積層方向）の力が電極体５により効率よく加わり、これにより、正極５３と負極５４との間にあるより僅かな金属や、負極５４において析出したより僅かな金属に起因する微短絡を生じさせることができる。その結果、負極５４に析出している金属をより精度よく検出することができる。 In the method for inspecting the electricity storage device 1 of the present embodiment, since the electricity storage device 1 is cooled from the measurement of the first voltage to the measurement of the second voltage, the pressure in the case 10 is reduced. For this reason, a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) by the clamping device 80 via the case 10 is efficiently applied to the electrode body 5, and thereby, between the positive electrode 53 and the negative electrode 54. A slight short circuit caused by a slight amount of metal or a slight amount of metal deposited on the negative electrode 54 can be generated. As a result, the metal deposited on the negative electrode 54 can be detected with higher accuracy.
また、本実施形態の蓄電素子１の検査方法では、蓄電素子１と共に、金属製の接続部８２を備え且つ該蓄電素子１を締め付け（挟持し）ている挟持装置８０も冷却している。このため、冷却によって金属製の接続部８２が縮み、この接続部８２の縮みに起因するＸ軸方向（前記積層方向）の力が一対の挟持部材８１から電極体５に対して加わる。これにより、Ｘ軸方向（前記積層方向）のより大きな力が電極体５に加わる。このため、蓄電素子１（電極体５）において、正極５３と負極５４との間にあるより僅かな金属や、負極５４で析出しているより僅かな金属に起因する微短絡を生じさせることができ、その結果、負極５４に析出している金属をより精度よく検出することができる。 Further, in the inspection method for the power storage element 1 of the present embodiment, the power storage element 1 and the clamping device 80 that includes the metal connection portion 82 and clamps (holds) the power storage element 1 are also cooled. For this reason, the metal connection portion 82 is contracted by cooling, and a force in the X-axis direction (the stacking direction) resulting from the contraction of the connection portion 82 is applied to the electrode body 5 from the pair of clamping members 81. Thereby, a greater force in the X-axis direction (the stacking direction) is applied to the electrode body 5. For this reason, in the electrical storage element 1 (electrode body 5), a slight short circuit caused by a smaller amount of metal between the positive electrode 53 and the negative electrode 54 or a smaller amount of metal deposited on the negative electrode 54 may occur. As a result, the metal deposited on the negative electrode 54 can be detected with higher accuracy.
また、本実施形態の蓄電素子１の製造方法では、蓄電素子１の組み立て工程の後に、上述の検査（負極５４に析出している金属の検知）を行うため、蓄電素子１の電極体５の正極５３と負極５４との間にあるより僅かな金属や、負極５４において析出している金属を精度よく検出することができる。このため、正極５３と負極５４との間に金属がある状態や、負極５４に金属が析出した状態の蓄電素子１を使用することを防ぐことができる。 Moreover, in the manufacturing method of the electrical storage element 1 of this embodiment, in order to perform the above-mentioned inspection (detection of the metal deposited on the negative electrode 54) after the assembly process of the electrical storage element 1, It is possible to accurately detect a smaller amount of metal between the positive electrode 53 and the negative electrode 54 and a metal deposited on the negative electrode 54. For this reason, it can prevent using the electrical storage element 1 in the state with a metal between the positive electrode 53 and the negative electrode 54, or the state in which the metal deposited on the negative electrode 54.
尚、本発明の蓄電素子１の検査方法、蓄電素子１を備える蓄電装置の検査方法、蓄電素子１の製造方法、及び蓄電素子１を備える蓄電装置の製造方法は、第一及び第二実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。 In addition, the inspection method of the electrical storage element 1 of the present invention, the inspection method of the electrical storage device including the electrical storage element 1, the manufacturing method of the electrical storage element 1, and the manufacturing method of the electrical storage device including the electrical storage element 1 are the first and second embodiments. Of course, various modifications can be made without departing from the scope of the present invention. For example, the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of an embodiment can be deleted.
上記第一実施形態の蓄電装置の検査方法、及び第二実施形態の蓄電素子１の検査方法（以下、単に「第一及び第二実施形態の検査方法」と称する。）では、少なくとも第一の電圧の測定から第二の電圧の測定までの間、蓄電装置又は蓄電素子１が冷却された状態であるが、この構成に限定されない。第一の電圧の測定から第二の電圧の測定までの間、蓄電装置又は蓄電素子が冷却されてなくてもよい。かかる構成によっても、電極体５（平坦部５７）にＸ軸方向（平坦部５７における正極５３等の積層方向）の両側から力が加わるため、正極５３と負極５４との間にある（混入した）金属や、負極５４に析出している金属を精度よく検知することができる。 In the inspection method of the power storage device of the first embodiment and the inspection method of the power storage element 1 of the second embodiment (hereinafter simply referred to as “the inspection method of the first and second embodiments”), at least the first. The power storage device or the power storage element 1 is in a cooled state during the period from the voltage measurement to the second voltage measurement, but is not limited to this configuration. The power storage device or the power storage element may not be cooled from the measurement of the first voltage to the measurement of the second voltage. Even with such a configuration, force is applied to the electrode body 5 (flat portion 57) from both sides in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57), so that it is between the positive electrode 53 and the negative electrode 54 (mixed). ) The metal and the metal deposited on the negative electrode 54 can be accurately detected.
また、蓄電装置等の冷却は、第一の電圧の測定から第二の電圧の測定までの間の一部の期間だけでもよい。かかる構成であっても、冷却している間はケース内の圧力が低下する。このため、電極体５に対して正極５３等の積層方向に加わる力のみでは微短絡が生じない程度しか析出していない金属を、その間（冷却している間）微短絡させることができ、これにより、通常の放電のみの場合よりも大きな電圧降下を検出できるため、前記金属を検出することができる。 Further, cooling of the power storage device or the like may be performed only during a part of the period from the measurement of the first voltage to the measurement of the second voltage. Even in such a configuration, the pressure in the case decreases while cooling. For this reason, the metal which has precipitated only to such an extent that only a force applied to the electrode body 5 in the stacking direction of the positive electrode 53 or the like does not cause a fine short circuit can be finely short circuited (while cooling). As a result, a larger voltage drop than in the case of only normal discharge can be detected, and thus the metal can be detected.
上記第一及び第二実施形態の検査方法では、蓄電装置等を１０℃以下の所定温度まで冷却しているが、この構成に限定されない。蓄電装置等が検査前に保管等されているときのケース１０の内部空間１３の温度より低い温度に冷却されればよい。これにより、ケース１０の内部の圧力を下げることができ、外部からの力がケース１０を介して電極体５に伝わり易くなる。 In the inspection methods of the first and second embodiments, the power storage device and the like are cooled to a predetermined temperature of 10 ° C. or lower, but the configuration is not limited to this. What is necessary is just to cool to the temperature lower than the temperature of the internal space 13 of the case 10 when an electrical storage apparatus etc. is stored before a test | inspection. Thereby, the pressure inside the case 10 can be lowered, and the force from the outside is easily transmitted to the electrode body 5 via the case 10.
上記第一実施形態の蓄電装置の検査方法では、保持部材３によるＸ軸方向の締め付け力のみによって、正極５３と負極５４との間にある（混入した）より僅かな金属や、負極５４に僅かに析出した金属を正極５３と負極５４とに接触させている（微短絡させている）が、この構成に限定されない。挟持（締め付け）装置８０等によって、蓄電装置をＸ軸方向にさらに締め付ける構成であってもよい。 In the inspection method of the power storage device of the first embodiment, only a slight amount of metal between the positive electrode 53 and the negative electrode 54 (mixed) or a slight amount of the negative electrode 54 is obtained by only the tightening force in the X-axis direction by the holding member 3. Although the metal deposited on the positive electrode 53 and the negative electrode 54 is brought into contact (slightly short-circuited), the structure is not limited to this. A configuration in which the power storage device is further tightened in the X-axis direction by a clamping (tightening) device 80 or the like may be used.
上記第一及び第二実施形態の検査方法の検査対象は、正極５３等が巻回されたいわゆる巻回型の蓄電素子１であるが、略矩形状の正極５３、負極５４及びセパレータ５５が積層されたいわゆる積層型の蓄電素子であってもよい。 The inspection object of the inspection methods of the first and second embodiments is a so-called winding type power storage element 1 around which the positive electrode 53 and the like are wound, but the substantially rectangular positive electrode 53, negative electrode 54 and separator 55 are laminated. A so-called stacked power storage element may be used.
上記第一及び第二実施形態では、第一の電圧及び第二の電圧に基づいて、蓄電素子及び蓄電装置を検査しているが、これに限定されない。即ち、例えば、蓄電素子及び蓄電装置において測定される電気的特性の基準値を設定し、当該基準値に基づいて検査してもよい。具体的には、例えば、蓄電素子の抵抗値を測定し、当該抵抗値が基準値よりも大きい場合に、微短絡が発生していると判断してもよい。 In said 1st and 2nd embodiment, although an electrical storage element and an electrical storage apparatus are test | inspected based on a 1st voltage and a 2nd voltage, it is not limited to this. That is, for example, a reference value of electrical characteristics measured in the power storage element and the power storage device may be set and inspected based on the reference value. Specifically, for example, the resistance value of the power storage element may be measured, and when the resistance value is larger than the reference value, it may be determined that a slight short circuit has occurred.
１…蓄電素子、１０…ケース、１００…ケース本体、１００ａ…閉塞部、１００ｂ…胴部、１００ｃ…長壁部、１００ｄ…短壁部、１０１…蓋板、１０２…開口周縁部、１１…外部端子、１１０…面、１２…集電体、１３…内部空間、１４…絶縁部材、２…スペーサ、２Ａ…内部スペーサ、２Ｂ…外部スペーサ、２０、２０Ａ、２０Ｂ…ベース、２０３…通風路、２１Ａ、２１Ｂ…規制部、３…保持部材、３０…終端部材、３１…フレーム、３１０…第一接続部（接続部）、３１１…第二接続部（接続部）、３１２…支持部、３１４…補強部、４…インシュレータ、４０…第一絶縁部、４１…第二絶縁部、４２…第三絶縁部、４３…第四絶縁部、５…電極体、５１…巻芯、５２…積層体、５３…正極、５４…負極、５３１、５４１…非被覆部、５３２、５４２…被覆部、５５…セパレータ、５６…非被覆積層部、正極非被覆積層部、負極非被覆積層部、５７…平坦部、５８…湾曲部、７０…試験室、７１…検査装置、８０…挟持装置、８１…挟持部材、８２…接続部、８３…回転操作部、８４…間隔調整機構 DESCRIPTION OF SYMBOLS 1 ... Power storage element, 10 ... Case, 100 ... Case main body, 100a ... Closure part, 100b ... Trunk part, 100c ... Long wall part, 100d ... Short wall part, 101 ... Cover plate, 102 ... Opening peripheral part, 11 ... External terminal , 110 ... surface, 12 ... current collector, 13 ... internal space, 14 ... insulating member, 2 ... spacer, 2A ... internal spacer, 2B ... external spacer, 20, 20A, 20B ... base, 203 ... ventilation path, 21A, 21B ... Regulating part, 3 ... Holding member, 30 ... Terminal member, 31 ... Frame, 310 ... First connecting part (connecting part), 311 ... Second connecting part (connecting part), 312 ... Supporting part, 314 ... Reinforcing part DESCRIPTION OF SYMBOLS 4 ... Insulator, 40 ... 1st insulation part, 41 ... 2nd insulation part, 42 ... 3rd insulation part, 43 ... 4th insulation part, 5 ... Electrode body, 51 ... Core, 52 ... Laminated body, 53 ... Positive electrode, 54... Negative electrode, 531, 541. 532, 542 ... Covering part, 55 ... Separator, 56 ... Uncoated laminated part, Positive electrode uncoated laminated part, Negative electrode uncoated laminated part, 57 ... Flat part, 58 ... Curved part, 70 ... Test chamber, 71 ... Inspection device, DESCRIPTION OF SYMBOLS 80 ... Holding apparatus, 81 ... Holding member, 82 ... Connection part, 83 ... Rotation operation part, 84 ... Space | interval adjustment mechanism
Claims (7)
前記蓄電素子を冷却することと、
前記力が加えられ且つ前記冷却された状態の前記蓄電素子における電気的特性を測定することと、を備える、蓄電素子の検査方法。 An electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator, and the case of the electricity storage device having a case for housing the electrode body, the positive electrode and the negative electrode are formed from the outside of the case. Applying force in the stacking direction;
Cooling the electricity storage element;
Measuring the electrical characteristics of the electricity storage device in the cooled state, to which the force is applied, and to inspect the electricity storage device.
前記冷却では、前記蓄電素子と共に前記一対の挟持部材及び前記接続部を冷却する、請求項１に記載の蓄電素子の検査方法。 When applying the force, the force is applied by a pair of sandwiching members disposed on both sides of the case in the stacking direction, and a metal connection portion extending in the stacking direction and connecting the pair of sandwiching members. To the case,
The method for testing a storage element according to claim 1, wherein in the cooling, the pair of clamping members and the connection portion are cooled together with the storage element.
前記蓄電素子を冷却することと、
前記力が加えられ且つ前記冷却された状態の前記蓄電素子における電気的特性を測定することと、を備える、蓄電装置の検査方法。 In a power storage device including an electrode body including a separator and positive and negative electrodes alternately stacked via the separator, and at least one power storage element having a case for housing the electrode body, Applying force in the stacking direction of the positive electrode and the negative electrode from the outside of the case;
Cooling the electricity storage element;
Measuring the electrical characteristics of the storage element in the cooled state, to which the force is applied, and to check the storage device.
前記力を加えるときに、前記複数の蓄電素子のそれぞれの前記ケースに対し、該ケースの外側から前記正極及び前記負極の積層方向に力を加え、
前記電気的特性の測定では、前記複数の蓄電素子のそれぞれの電気的特性を測定する、請求項３に記載の蓄電装置の検査方法。 The power storage device includes a plurality of power storage elements,
When applying the force, for each case of the plurality of power storage elements, apply a force in the stacking direction of the positive electrode and the negative electrode from the outside of the case,
The electrical storage device inspection method according to claim 3, wherein the electrical characteristics are measured by measuring electrical characteristics of each of the plurality of electrical storage elements.
前記保持部材は、前記蓄電素子に前記力を加え、
前記冷却では、前記蓄電素子と共に前記保持部材を冷却する、請求項４に記載の蓄電装置の検査方法。 The power storage device is a holding member that holds the power storage element, the pair of termination members disposed on both sides of the power storage element in the stacking direction, and the pair of termination members that extend in the stacking direction and connect the pair of termination members A holding member having a metal connection part
The holding member applies the force to the power storage element,
The method for testing a power storage device according to claim 4, wherein, in the cooling, the holding member is cooled together with the power storage element.
前記蓄電素子の形成後、請求項１又は２に記載の蓄電素子の検査方法を行うことと、を備える、蓄電素子の製造方法。 Accommodating an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator in a case to form a power storage element;
A method for manufacturing a power storage element, comprising: performing the method for testing a power storage element according to claim 1 after forming the power storage element.
前記蓄電素子の形成後、請求項３〜５のいずれか１項に記載の蓄電装置の検査方法を行うことと、を備える、蓄電装置の製造方法。 Accommodating an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator in a case to form a storage element;
A method for manufacturing a power storage device comprising: performing the method for testing a power storage device according to any one of claims 3 to 5 after forming the power storage element.
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| JP2010153275A (en) * | 2008-12-26 | 2010-07-08 | Toyota Motor Corp | Method for deciding quality of secondary battery, and method for manufacturing secondary battery |
| JP2012084346A (en) * | 2010-10-08 | 2012-04-26 | Toyota Motor Corp | Method for producing lithium ion secondary battery |
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| JP2013114986A (en) * | 2011-11-30 | 2013-06-10 | Toyota Motor Corp | Secondary battery manufacturing method |
| US20140123472A1 (en) * | 2012-11-06 | 2014-05-08 | Toyota Jidosha Kabushiki Kaisha | Manufacturing method of battery pack |
| JP2013055070A (en) * | 2012-12-19 | 2013-03-21 | Sanyo Electric Co Ltd | Battery pack |
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| JP2019192553A (en) * | 2018-04-26 | 2019-10-31 | トヨタ自動車株式会社 | Li precipitation evaluation method |
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