JP2013110033A - Method for manufacturing nonaqueous electrolyte secondary battery - Google Patents

Method for manufacturing nonaqueous electrolyte secondary battery Download PDF

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JP2013110033A
JP2013110033A JP2011255583A JP2011255583A JP2013110033A JP 2013110033 A JP2013110033 A JP 2013110033A JP 2011255583 A JP2011255583 A JP 2011255583A JP 2011255583 A JP2011255583 A JP 2011255583A JP 2013110033 A JP2013110033 A JP 2013110033A
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winding
wound body
case
nonaqueous electrolyte
secondary battery
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Yusuke Onoda
祐介 小野田
Junko Ohira
純子 大平
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

PROBLEM TO BE SOLVED: To provide a technique for performing a liquid injection process of a nonaqueous electrolyte secondary battery for a short time.SOLUTION: A method for manufacturing a nonaqueous electrolyte secondary battery storing a wound body configured by winding an electrode, and a nonaqueous electrolyte in its case includes, when injecting the nonaqueous electrolyte into the case, setting a temperature in a central portion in a winding axial direction of the wound body to be lower than that in an end in the winding axial direction to generate a pressure difference in the wound body. Accordingly, pressure is applied to the nonaqueous electrolyte to be injected into the case to promote permeation of the nonaqueous electrolyte into the central portion of the wound body.

Description

本発明は、非水電解液二次電池の製造方法に関する。   The present invention relates to a method for manufacturing a non-aqueous electrolyte secondary battery.

電池の大容量化の要請に伴い、電極（正極および負極）を捲回して構成した捲回体の大型化が進んでいる。その一方で、大型化した捲回体に非水電解液を含浸させる作業工程の長時間化が問題となっている。   Along with a demand for a large capacity battery, a winding body configured by winding electrodes (a positive electrode and a negative electrode) is increasing in size. On the other hand, there is a problem of lengthening the work process of impregnating the non-aqueous electrolyte into the enlarged winding body.

特許文献１には、真空ポンプ、加圧ポンプ、ガスボンベ及び注液ポンプに連通するチャンバ内で行われる非水電解液二次電池への注液工程が開示されている。
この注液工程は、真空ポンプによってチャンバ内を減圧する第一工程と、ガスボンベから非水電解液に溶解し得る気体を注入する第二工程と、加圧ポンプでチャンバ内を加圧しつつ、注液ポンプから二次電池に注液する第三工程と、真空ポンプで減圧し、第二工程で注入された気体を除去する第四工程とを含む。 Patent Document 1 discloses a liquid injection process to a non-aqueous electrolyte secondary battery performed in a chamber communicating with a vacuum pump, a pressure pump, a gas cylinder, and a liquid injection pump.
The liquid injection process includes a first process in which the inside of the chamber is decompressed by a vacuum pump, a second process in which a gas that can be dissolved in the nonaqueous electrolytic solution is injected from a gas cylinder, and a pressure pump is used while pressurizing the inside of the chamber. A third step of injecting the liquid into the secondary battery from the liquid pump and a fourth step of reducing the pressure by the vacuum pump and removing the gas injected in the second step are included.

特開２００７−３３５１８１号公報JP 2007-335181 A

特許文献１に記載のように、真空ポンプで減圧した状態で電解液を注液する場合、注液用の設備が大型になり高コストに繋がるという課題がある。さらには、電池ケースに減圧用のポートが必要になるが、その開口位置に制約がある。このため、密度が高く、含浸に時間のかかる捲回体中央部への浸透時間を短くすることが困難であるという課題がある。
本発明は、捲回体中央部への非水電解液の浸透時間を短縮し、非水電解液二次電池への注液を短時間で行う技術を提供することを目的とする。 As described in Patent Document 1, in the case of injecting an electrolytic solution in a state where the pressure is reduced by a vacuum pump, there is a problem that a facility for injecting the liquid becomes large and leads to high costs. Furthermore, although a port for decompression is required in the battery case, the opening position is limited. For this reason, there is a problem that it is difficult to shorten the permeation time to the central part of the wound body which is high in density and takes time for impregnation.
An object of the present invention is to provide a technique for shortening the permeation time of a non-aqueous electrolyte into the central part of a wound body and injecting the non-aqueous electrolyte secondary battery in a short time.

本発明の非水電解液二次電池の製造方法は、ケース内に、電極を捲回して構成される捲回体及び非水電解液を収容する非水電解液二次電池を製造する方法であって、前記非水電解液を前記ケース内に注液する際に、前記捲回体の捲回軸方向中央部の温度を捲回軸方向端部の温度よりも低くし、当該捲回体内に圧力差を発生させる。   The method for producing a non-aqueous electrolyte secondary battery according to the present invention is a method for producing a non-aqueous electrolyte secondary battery that accommodates a wound body constituted by winding an electrode and a non-aqueous electrolyte in a case. And when pouring the non-aqueous electrolyte into the case, the temperature of the winding body in the winding axis direction is made lower than the temperature of the winding axis direction end, and the winding body A pressure difference is generated.

前記捲回体は、前記電極を捲回した後に扁平状にプレスすることにより構成され、前記捲回した電極を扁平状にプレスして前記捲回体を構成する際に、前記捲回体の捲回軸方向中央部の温度を捲回軸方向端部の温度よりも低くすることが好ましい。   The wound body is formed by pressing the wound electrode into a flat shape, and when forming the wound body by pressing the wound electrode into a flat shape, It is preferable that the temperature at the central portion in the winding axis direction is lower than the temperature at the end portion in the winding axis direction.

本発明によれば、非水電解液二次電池の注液工程を短時間で行うことができる。   ADVANTAGE OF THE INVENTION According to this invention, the liquid injection process of a nonaqueous electrolyte secondary battery can be performed in a short time.

非水電解液二次電池を示す図である。It is a figure which shows a nonaqueous electrolyte secondary battery. 捲回体を示す図である。It is a figure which shows a winding body. 非水電解液を注液する工程を示す図である。It is a figure which shows the process of injecting a non-aqueous electrolyte. 注液工程における捲回体内での圧力の作用を示す図である。It is a figure which shows the effect | action of the pressure in the wound body in a liquid injection process. 捲回体をプレスする工程を示す図である。It is a figure which shows the process of pressing a winding body.

図１に示すように、非水電解液二次電池１（以下、単に「電池１」）は、捲回体２及び非水電解液を収容するケース３と、ケース３の一面から外方に向けて突出する正極・負極の外部端子４・４とを具備する。捲回体２は、電池１の充放電要素となる電極体であって、電極（正極および負極）を捲回して構成されている。外部端子４・４は、捲回体２の正極側・負極側にそれぞれ接続されている。ケース３において、外部端子４・４が突出する面には、ケース３内に非水電解液を注液するための注液口５が設けられている。   As shown in FIG. 1, a non-aqueous electrolyte secondary battery 1 (hereinafter simply “battery 1”) includes a wound body 2 and a case 3 containing a non-aqueous electrolyte, and outward from one surface of the case 3. It has positive and negative external terminals 4 and 4 projecting toward it. The wound body 2 is an electrode body that is a charge / discharge element of the battery 1 and is configured by winding electrodes (a positive electrode and a negative electrode). The external terminals 4 and 4 are connected to the positive electrode side and the negative electrode side of the wound body 2, respectively. In the case 3, a liquid injection port 5 for injecting a non-aqueous electrolyte into the case 3 is provided on the surface from which the external terminals 4 and 4 protrude.

図２に示すように、電極材料が塗工された正極箔１１及び負極箔１２を、セパレータ１３を介して積層し、ロール状に捲回する。さらに、正極箔１１、負極箔１２、セパレータ１３をロール状に捲回した状態から、対向する両側からプレスすることによって、これらを扁平状に成形する。このようにして、ケース３の内部空間に応じた形状に成形された捲回体２が製造される。
捲回体２の捲回軸方向両端部には、正極箔１１及び負極箔１２の前記電極材料が塗工されていない未塗工部が突出しており、その部分において正極箔１１及び負極箔１２と外部端子４・４とがそれぞれ接続される。 As shown in FIG. 2, the positive electrode foil 11 and the negative electrode foil 12 coated with the electrode material are stacked via a separator 13 and wound into a roll shape. Further, the positive foil 11, the negative foil 12, and the separator 13 are rolled into a flat shape by pressing them from opposite sides. In this way, the wound body 2 formed into a shape corresponding to the internal space of the case 3 is manufactured.
Uncoated portions of the positive electrode foil 11 and the negative electrode foil 12 that are not coated with the electrode material protrude from both ends of the wound body 2 in the winding axis direction, and the positive electrode foil 11 and the negative electrode foil 12 are protruded at the portions. And external terminals 4 and 4 are connected to each other.

図３及び図４に示すように、注液工程では、捲回体２がケース３に収容された状態で、注液口５からケース３内に非水電解液が注液される。ケース３内に注液された非水電解液は、捲回体２の開放端である捲回軸方向端からその中央部に向かって浸透し、捲回体２の内部に含浸する。   As shown in FIG. 3 and FIG. 4, in the liquid injection process, the nonaqueous electrolyte is injected into the case 3 from the liquid injection port 5 in a state where the wound body 2 is accommodated in the case 3. The nonaqueous electrolytic solution poured into the case 3 penetrates from the winding shaft direction end, which is the open end of the winding body 2, toward the center thereof, and impregnates the inside of the winding body 2.

図３に示すように、注液工程中にケース３内に所定の温度分布が生じるように、ケース３の周囲に温度制御装置２０が配置されている。
温度制御装置２０は、ケース３を挿入できる深さを有する箱状に構成され、捲回体２の捲回軸方向中央部に相当する部位に冷却装置２１、捲回体２の捲回軸方向両端部に相当する部位に加熱装置２２・２２が内蔵されている。言い換えれば、加熱装置２２・２２は、捲回体２の開放端近傍に配置されており、冷却装置２１は、加熱装置２２・２２の間に配置されている。 As shown in FIG. 3, a temperature control device 20 is arranged around the case 3 so that a predetermined temperature distribution is generated in the case 3 during the liquid injection process.
The temperature control device 20 is configured in a box shape having a depth into which the case 3 can be inserted, and a cooling device 21 and a winding axis direction of the winding body 2 are provided at a portion corresponding to a central portion in the winding axis direction of the winding body 2. Heating devices 22 and 22 are built in portions corresponding to both ends. In other words, the heating devices 22 and 22 are disposed in the vicinity of the open end of the wound body 2, and the cooling device 21 is disposed between the heating devices 22 and 22.

冷却装置２１は、ケース３の幅広面の表面及び裏面に接する又はケース３の熱を抜熱可能なクーラ（冷却部）を含む。冷却装置２１は、捲回体２の捲回軸方向中央部に相当する位置、つまり電池１の外部端子４・４が配置される間の領域に設けられる。
注液工程において、冷却装置２１は、捲回体２の中央部の温度が他の部位よりも低くなるように電池１を冷却する。例えば、冷却装置２１によって冷却される部分において、捲回体２の温度が１０℃から１５℃程度となるように冷却装置２１の出力等を設定することが好ましい。 The cooling device 21 includes a cooler (cooling unit) that comes into contact with the front surface and the rear surface of the wide surface of the case 3 or can extract heat from the case 3. The cooling device 21 is provided at a position corresponding to the central portion of the winding body 2 in the winding axis direction, that is, in a region between the external terminals 4 and 4 of the battery 1.
In the liquid injection process, the cooling device 21 cools the battery 1 so that the temperature of the central part of the wound body 2 is lower than that of other parts. For example, it is preferable to set the output of the cooling device 21 so that the temperature of the wound body 2 is about 10 ° C. to 15 ° C. in the portion cooled by the cooling device 21.

加熱装置２２は、ケース３の幅広面の表面及び裏面に接する又はケース３に熱を伝達可能なヒータ（加熱部）を含む。加熱装置２２のヒータは、捲回体２の捲回軸方向端部に相当する位置、つまり電池１の外部端子４・４が配置される部位及びその外側に設けられる。
注液工程において、加熱装置２２は、捲回体２の端部の温度が他の部位よりも高くなるように電池１を加熱する。例えば、加熱装置２２によって加熱される部分において、捲回体２の温度が７０℃から８０℃程度となるように加熱装置２２の出力等を設定することが好ましい。ただし、この設定温度の上限値は、捲回体２のセパレータ１３の温度特性等、電池１の構成要素の特性に応じて設定する必要がある。 The heating device 22 includes a heater (heating unit) that is in contact with the front and back surfaces of the wide surface of the case 3 or that can transfer heat to the case 3. The heater of the heating device 22 is provided at a position corresponding to an end of the wound body 2 in the winding axis direction, that is, at a portion where the external terminals 4 and 4 of the battery 1 are disposed and outside thereof.
In the liquid injection process, the heating device 22 heats the battery 1 so that the temperature of the end of the wound body 2 is higher than that of other parts. For example, it is preferable to set the output of the heating device 22 and the like so that the temperature of the wound body 2 is about 70 ° C. to 80 ° C. in the portion heated by the heating device 22. However, the upper limit value of the set temperature needs to be set according to the characteristics of the components of the battery 1 such as the temperature characteristics of the separator 13 of the wound body 2.

以上のように、注液工程において、温度制御装置２０に収容された電池１は、捲回体２の中央部が冷却装置２１によって冷却されるとともに、その両端部が加熱装置２２・２２によって加熱される。
これにより、ケース３（捲回体２）内に温度分布が生じる。注液工程においてケース３内の体積は一定であるため、図４に示すように、捲回体２内には温度分布に応じた圧力分布が生じる。つまり、捲回体２内では、高温部が高圧、低温部が低圧となり、特に捲回軸方向中央部が低圧となる。従って、ケース３内に注入された非水電解液に圧力が作用し、捲回体２の中央部への含浸が促進される。
このように、注液工程において、温度制御装置２０を用いてケース３（捲回体２）内に温度分布を発生させることで、捲回体２の中央部への含浸速度を向上し、注液工程にかかる時間を短縮可能としている。 As described above, in the liquid injection process, the battery 1 housed in the temperature control device 20 is cooled by the cooling device 21 at the center of the wound body 2 and heated by the heating devices 22 and 22 at both ends. Is done.
Thereby, temperature distribution arises in case 3 (winding body 2). Since the volume in the case 3 is constant in the liquid injection process, a pressure distribution corresponding to the temperature distribution is generated in the wound body 2 as shown in FIG. That is, in the wound body 2, the high temperature portion has a high pressure and the low temperature portion has a low pressure, and particularly the central portion in the winding axis direction has a low pressure. Accordingly, pressure acts on the non-aqueous electrolyte injected into the case 3 and the impregnation of the central portion of the wound body 2 is promoted.
In this way, in the liquid injection process, the temperature control device 20 is used to generate a temperature distribution in the case 3 (winding body 2), thereby improving the impregnation rate into the central portion of the winding body 2, The time required for the liquid process can be shortened.

さらに、捲回体２だけでなくケース３内にも温度分布を作ることで、非水電解液がケース３内で対流し、捲回体２への含浸を促進させることができる。
また、電池ケース内を減圧し、ケース内外の圧力差を設ける従来技術と異なり、本実施形態では、ケース３内の捲回体２に温度差を設けて、圧力差を設けている。このため、大きな設備を必要とせず、電池１のケース３を収容し温度分布を付与する温度制御装置２０を導入するだけで良く、設備コストの面で有利である。 Further, by creating a temperature distribution not only in the wound body 2 but also in the case 3, the non-aqueous electrolyte convects in the case 3 and the impregnation into the wound body 2 can be promoted.
Further, unlike the prior art in which the inside of the battery case is depressurized and a pressure difference inside and outside the case is provided, in this embodiment, a temperature difference is provided in the wound body 2 in the case 3 to provide a pressure difference. For this reason, it is only necessary to introduce a temperature control device 20 that accommodates the case 3 of the battery 1 and imparts a temperature distribution without requiring a large facility, which is advantageous in terms of facility cost.

なお、温度制御装置２０の形態は、上記のような箱状のものに限らず、電池１のケース３の幅広面の全体を両側から挟み込むことが可能であれば良い。例えば、冷却装置２１及び加熱装置２２・２２を含む平板を二つ組み合わせて、ケース３の幅広面に当接させるなどの形態を採用できる。
また、冷却装置２１及び加熱装置２２・２２の配置は、非水電解液の含浸速度を向上したい部位（捲回体２の捲回軸方向中央部）が低温となり、その他の部位（捲回軸方向端部）が高温となるような温度分布を付与できるものであれば良く、上記の実施形態に限定されない。 The form of the temperature control device 20 is not limited to the box shape as described above, and it is sufficient that the entire wide surface of the case 3 of the battery 1 can be sandwiched from both sides. For example, a configuration in which two flat plates including the cooling device 21 and the heating devices 22 and 22 are combined and brought into contact with the wide surface of the case 3 can be employed.
Further, the arrangement of the cooling device 21 and the heating devices 22 and 22 is such that the portion where the impregnation speed of the nonaqueous electrolyte is to be improved (the central portion in the winding axis direction of the winding body 2) is low, and the other portions (the winding shaft) Any material can be used as long as it can provide a temperature distribution such that the (direction end) becomes high, and the present invention is not limited to the above embodiment.

図５に示すように、捲回体２をプレスする際に用いるプレス装置３０は、温度制御装置２０と同様の温度調整機能を有する。
すなわち、ロール状に捲回される捲回体２の相対する両側面を押圧し、扁平状にプレス成形するためのプレス装置３０は、捲回体２の捲回軸方向中央部分に相当する部位に冷却装置３１、捲回体２の捲回軸方向両端部に相当する部位に加熱装置３２・３２を備える。 As shown in FIG. 5, the press device 30 used when pressing the wound body 2 has the same temperature adjustment function as the temperature control device 20.
That is, the pressing device 30 for pressing the opposite side surfaces of the wound body 2 wound in a roll shape and press-molding it into a flat shape is a portion corresponding to the central portion of the wound body 2 in the winding axis direction. In addition, the cooling device 31 and heating devices 32 and 32 are provided at portions corresponding to both ends of the winding body 2 in the winding axis direction.

冷却装置３１は、温度制御装置２０の冷却装置２１と同様に構成され、捲回体２の幅広面の表面及び裏面の熱を抜熱するものである。加熱装置３２は、温度制御装置２０の加熱装置２２と同様に構成され、捲回体２の幅広面の表面及び裏面を加熱するものである。
プレス装置３０によって捲回体２をプレスする際に、冷却装置３１及び加熱装置３２・３２によって、捲回体２自体に、注液工程で付与する温度分布と同様の温度分布を付与する。 The cooling device 31 is configured in the same manner as the cooling device 21 of the temperature control device 20, and removes heat from the front and back surfaces of the wide surface of the wound body 2. The heating device 32 is configured similarly to the heating device 22 of the temperature control device 20, and heats the front surface and the back surface of the wide surface of the wound body 2.
When the winding body 2 is pressed by the pressing device 30, the cooling device 31 and the heating devices 32 and 32 give the winding body 2 itself a temperature distribution similar to the temperature distribution applied in the liquid injection process.

以上のように、注液工程の前工程である捲回体２のプレス工程において、プレス装置３０によって捲回体２をプレスするとともに、捲回体２の捲回軸方向に沿って温度分布を付与することによって、注液工程における温度制御装置２０による温度分布の付与にかかる時間を短縮することができる。従って、注液工程にかかる時間をさらに短縮できる。   As described above, in the pressing process of the wound body 2 which is a pre-process of the liquid injection process, the wound body 2 is pressed by the pressing device 30 and the temperature distribution is changed along the winding axis direction of the wound body 2. By applying, the time required for applying the temperature distribution by the temperature control device 20 in the liquid injection process can be shortened. Accordingly, the time required for the liquid injection process can be further shortened.

１：非水電解液二次電池、２：捲回体、３：ケース、２０：温度制御装置、２１：冷却装置、２２：加熱装置、３０：プレス装置、３１：冷却装置、３２：加熱装置   1: non-aqueous electrolyte secondary battery, 2: wound body, 3: case, 20: temperature control device, 21: cooling device, 22: heating device, 30: press device, 31: cooling device, 32: heating device

Claims (2)

ケース内に、電極を捲回して構成される捲回体及び非水電解液を収容する非水電解液二次電池を製造する方法であって、
前記非水電解液を前記ケース内に注液する際に、前記捲回体の捲回軸方向中央部の温度を捲回軸方向端部の温度よりも低くし、当該捲回体内に圧力差を発生させることを特徴とする非水電解液二次電池の製造方法。 In the case, a method for producing a non-aqueous electrolyte secondary battery containing a wound body constituted by winding an electrode and a non-aqueous electrolyte,
When injecting the non-aqueous electrolyte into the case, the temperature at the center of the winding body in the winding axis direction is made lower than the temperature at the end of the winding axis, and a pressure difference is introduced into the winding body. A method for producing a non-aqueous electrolyte secondary battery, wherein: 前記捲回体は、前記電極を捲回した後に扁平状にプレスすることにより構成され、
前記捲回した電極を扁平状にプレスして前記捲回体を構成する際に、
前記捲回体の捲回軸方向中央部の温度を捲回軸方向端部の温度よりも低くする請求項１に記載の非水電解液二次電池の製造方法。 The wound body is configured by pressing the electrode into a flat shape after winding the electrode,
When configuring the wound body by pressing the wound electrode into a flat shape,
The method for producing a non-aqueous electrolyte secondary battery according to claim 1, wherein a temperature at a central portion in the winding axis direction of the winding body is lower than a temperature at an end portion in the winding axis direction.
JP2011255583A 2011-11-22 2011-11-22 Method for manufacturing nonaqueous electrolyte secondary battery Pending JP2013110033A (en)

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JP2015079578A (en) * 2013-10-15 2015-04-23 トヨタ自動車株式会社 Method of manufacturing secondary battery
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Publication number Priority date Publication date Assignee Title
WO2015056583A1 (en) * 2013-10-15 2015-04-23 トヨタ自動車株式会社 Secondary cell production method
JP2015079578A (en) * 2013-10-15 2015-04-23 トヨタ自動車株式会社 Method of manufacturing secondary battery
CN105637679A (en) * 2013-10-15 2016-06-01 丰田自动车株式会社 Secondary cell production method
US10396342B2 (en) 2013-10-15 2019-08-27 Toyota Jidosha Kabushiki Kaisha Method for manufacturing secondary cell having a wound body effectively impregnated with electrolytic solution
JP2015173073A (en) * 2014-03-12 2015-10-01 トヨタ自動車株式会社 Method of manufacturing secondary battery
KR101841381B1 (en) 2014-03-14 2018-03-22 도요타 지도샤（주） Method for producing secondary battery and secondary battery
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