WO2015145852A1 - Secondary battery production method - Google Patents
Secondary battery production method Download PDFInfo
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- WO2015145852A1 WO2015145852A1 PCT/JP2014/079159 JP2014079159W WO2015145852A1 WO 2015145852 A1 WO2015145852 A1 WO 2015145852A1 JP 2014079159 W JP2014079159 W JP 2014079159W WO 2015145852 A1 WO2015145852 A1 WO 2015145852A1
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- exterior material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/52—Removing gases inside the secondary cell, e.g. by absorption
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0438—Processes of manufacture in general by electrochemical processing
- H01M4/044—Activating, forming or electrochemical attack of the supporting material
- H01M4/0445—Forming after manufacture of the electrode, e.g. first charge, cycling
- H01M4/0447—Forming after manufacture of the electrode, e.g. first charge, cycling of complete cells or cells stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
Definitions
- an aging process may be implemented after sealing a battery element with an exterior material.
- Gas may be generated inside the exterior material during the aging treatment.
- the secondary battery may expand. Due to the expansion of the secondary battery, the volume of the secondary battery may exceed a predetermined design value (target volume). Therefore, the objective of this invention is providing the manufacturing method of a secondary battery which can suppress generation
- the amount of gas generated inside the exterior material can be suppressed.
- an electrolytic solution 60 is put into the exterior member 40 (step S3).
- the opening of the exterior material 40 is directed in a direction opposite to the gravity direction G.
- the secondary battery may be left for a certain time, for example, about 4 hours.
- the unsealed one side 44 of the exterior material 40 is temporarily sealed, preferably in a vacuum state (step S4).
- the electrode element 34 is temporarily sealed along the entire circumference of the exterior material 60 (temporary sealing step).
- one side 44 of the exterior material sealed in the temporary sealing process may be referred to as a “temporary sealing portion”.
- a step of extending the wrinkles of the exterior material 40 may be optionally performed.
- Example 10 The results of comparing the amount of gas generated after the aging treatment for the lithium ion secondary battery in one example of the present invention and the lithium ion secondary battery in the comparative example are shown below.
- the lithium ion secondary battery in the Example of this invention was manufactured by the above-mentioned method.
- the electrolytic solution was put in the exterior material, and then a region of 85% of the area of the embossed portion of the exterior material was pressurized for a predetermined time.
- the secondary battery of the comparative example did not pressurize the secondary battery after putting the electrolytic solution in the exterior material.
- experiments were performed on a plurality of samples.
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- Secondary Cells (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Provided is a secondary battery production method whereby generation of gas after final sealing of a battery element with an external cover material can be suppressed. The secondary battery production method comprises: enveloping, with an external cover material, a battery element having a plurality of electrode sheets and separator sheets which are disposed between electrode sheets that are adjacent to one another; introducing an electrolytic solution to the interior of the external cover material; and after the electrolytic solution has been introduced to the interior of the external cover material, pressing the battery element from the exterior of the external cover material for a predetermined period of time.
Description
本発明は、二次電池の製造方法に関する。
The present invention relates to a method for manufacturing a secondary battery.
近年、ハイブリットカー、電気自動車又は電動アシスト自転車などの多くの用途で、二次電池が用いられている。二次電池は、再充電可能な電池として知られている(特開2009-146602号(以下、特許文献1と称する。)参照)。特許文献1に記載の二次電池は、電池要素と、電池要素を収容するラミネートフィルムと、を有する。電池要素は、複数の正極シートと、複数の負極シートと、正極シートと負極シートとの間に配置されたセパレータと、を有する。ラミネートフィルムは、電池要素とともに電解液を気密に収容している。
In recent years, secondary batteries have been used in many applications such as hybrid cars, electric cars, and electrically assisted bicycles. The secondary battery is known as a rechargeable battery (see Japanese Patent Application Laid-Open No. 2009-146602 (hereinafter referred to as Patent Document 1)). The secondary battery described in Patent Document 1 includes a battery element and a laminate film that houses the battery element. The battery element includes a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The laminate film contains the electrolyte solution together with the battery element in an airtight manner.
特許文献1は、二次電池の製造方法を開示している。特許文献1に記載の製造方法は、電池要素をラミネート外装材で覆った状態で、平板状の押え板で二次電池に圧力を加えつつラミネート外装材の内部へ電解液を少しずつ注入することを含む。
Patent Document 1 discloses a method for manufacturing a secondary battery. In the manufacturing method described in Patent Document 1, the battery element is covered with a laminate sheathing material, and an electrolyte is gradually injected into the inside of the laminate sheathing material while applying pressure to the secondary battery with a flat pressing plate. including.
一般に、二次電池を製造する際、電池要素を外装材で封止した後に、エージング処理を実施することがある。このエージング処理中に外装材の内部にガスが発生することがある。気密に封止された外装材の内部にガスが発生することで、二次電池が膨張することがある。二次電池の膨張により、二次電池の体積が所定の設計値(目標体積)を超えてしまうことがある。
よって、本発明の目的は、電池要素を外装材で本封止した後のガスの発生を抑制できる、二次電池の製造方法を提供することにある。 Generally, when manufacturing a secondary battery, an aging process may be implemented after sealing a battery element with an exterior material. Gas may be generated inside the exterior material during the aging treatment. When the gas is generated inside the hermetically sealed exterior material, the secondary battery may expand. Due to the expansion of the secondary battery, the volume of the secondary battery may exceed a predetermined design value (target volume).
Therefore, the objective of this invention is providing the manufacturing method of a secondary battery which can suppress generation | occurrence | production of the gas after main sealing of a battery element with an exterior material.
よって、本発明の目的は、電池要素を外装材で本封止した後のガスの発生を抑制できる、二次電池の製造方法を提供することにある。 Generally, when manufacturing a secondary battery, an aging process may be implemented after sealing a battery element with an exterior material. Gas may be generated inside the exterior material during the aging treatment. When the gas is generated inside the hermetically sealed exterior material, the secondary battery may expand. Due to the expansion of the secondary battery, the volume of the secondary battery may exceed a predetermined design value (target volume).
Therefore, the objective of this invention is providing the manufacturing method of a secondary battery which can suppress generation | occurrence | production of the gas after main sealing of a battery element with an exterior material.
本発明の一態様における二次電池の製造方法は、複数の電極シートと、互いに隣接する電極シートの間に配置されたセパレータシートと、を有する電池要素を、外装材で包むことと、外装材内に電解液を入れることと、外装材内に電解液を入れた後に、外装材の外側から電池要素を所定の時間加圧することと、を有する。
A method for manufacturing a secondary battery in one embodiment of the present invention includes: wrapping a battery element having a plurality of electrode sheets and a separator sheet disposed between adjacent electrode sheets; Putting the electrolytic solution into the inside, and pressurizing the battery element from the outside of the packaging material for a predetermined time after putting the electrolytic solution into the packaging material.
本発明によれば、外装材の内部に発生するガスの量を抑制することができる。
According to the present invention, the amount of gas generated inside the exterior material can be suppressed.
以下、本発明の実施形態について図面を参照して説明する。下記の実施形態で説明する二次電池は、ニッケル水素電池やリチウムイオン電池など、様々な種類の二次電池であってよい。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The secondary battery described in the following embodiment may be various types of secondary batteries such as a nickel metal hydride battery and a lithium ion battery.
図1は、一実施形態における二次電池の製造方法のフローチャートを示している。まず、電池要素を準備する(ステップS1)。図2は、電池要素の概略構成を示している。電池要素34は、複数の電極シート10,20と、互いに隣接する電極シート10,20の間に配置されたセパレータシート30と、を有する。電極要素34は、任意の数の電極シート10,20を有していてよい。
FIG. 1 shows a flowchart of a method for manufacturing a secondary battery in one embodiment. First, a battery element is prepared (step S1). FIG. 2 shows a schematic configuration of the battery element. The battery element 34 includes a plurality of electrode sheets 10 and 20 and a separator sheet 30 disposed between the electrode sheets 10 and 20 adjacent to each other. The electrode element 34 may have any number of electrode sheets 10 and 20.
複数の電極シートのうちの少なくとも1つは正極シート10であってよい。複数の電極シートのうちの残りの少なくとも1つは負極シート20であってよい。図3(a)は正極シート10の概略平面図であり、図3(b)は負極シート20の概略平面図である。正極シート10は、集電体12としての金属板又は金属箔と、集電体12上に塗布された正極合材14と、を含んでいてよい。負極シート20は、集電体22としての金属板又は金属箔と、集電体22上に塗布された負極合材24と、を含んでいてよい。各電極シート10,20における集電体12,22の一部が端子16,26を形成している。正極シート10の端子16には、正極用のリード18が接続される。負極シート20の端子26には、負極用のリード28が接続される。
At least one of the plurality of electrode sheets may be the positive electrode sheet 10. At least one of the plurality of electrode sheets may be the negative electrode sheet 20. FIG. 3A is a schematic plan view of the positive electrode sheet 10, and FIG. 3B is a schematic plan view of the negative electrode sheet 20. The positive electrode sheet 10 may include a metal plate or a metal foil as the current collector 12 and a positive electrode mixture 14 applied on the current collector 12. The negative electrode sheet 20 may include a metal plate or a metal foil as the current collector 22 and a negative electrode mixture 24 applied on the current collector 22. A part of current collectors 12 and 22 in each electrode sheet 10 and 20 forms terminals 16 and 26. A lead 18 for positive electrode is connected to the terminal 16 of the positive electrode sheet 10. A negative electrode lead 28 is connected to the terminal 26 of the negative electrode sheet 20.
セパレータシート30は、多孔性フィルム又は微多孔性フィルムであってよい。セパレータシート30は、例えば、ポリエチレン又はポリプロピレンなどの合成樹脂から形成することができる。また、セパレータシート30はセラミックス製の多孔質膜から形成されていてもよい。その一例として、セパレータシート30は、Al2O3等のセラミックが塗布された多孔質基材から形成されていてよい。
Separator sheet 30 may be a porous film or a microporous film. Separator sheet 30 can be formed from synthetic resin, such as polyethylene or polypropylene, for example. The separator sheet 30 may be formed of a ceramic porous film. As an example, the separator sheet 30 may be formed of a porous substrate coated with a ceramic such as Al 2 O 3 .
次に、図4に示すように、電池要素34を外装材40で包む(ステップS2)。外装材40は、可撓性フィルムから形成されていてよい。一例では、外装材40は、ラミネートフィルムであってよい。ラミネートフィルムは、例えば、金属箔の両面を絶縁性の樹脂層で覆った形態を有する。
Next, as shown in FIG. 4, the battery element 34 is wrapped with an exterior material 40 (step S2). The packaging material 40 may be formed from a flexible film. In one example, the exterior material 40 may be a laminate film. The laminate film has, for example, a form in which both surfaces of a metal foil are covered with an insulating resin layer.
具体的一例では、電池要素34は、2枚のラミネートフィルムで挟み込まれる。それから、2枚のラミネートフィルムの一辺44を除き、2枚のラミネートフィルムの周囲を熱融着することができる。熱溶着された部分は、図4にでは符号42で示されている。これにより、電極要素34が外装材40で包まれる。ただし、リード18,28は外装材40から引き出された状態にする。ここで、外装材40の一辺44は、封着されておらず、開口を形成している。この開口を介して外装材40の内部にアクセス可能となっている。
In a specific example, the battery element 34 is sandwiched between two laminate films. Then, the periphery of the two laminate films can be heat-sealed except for one side 44 of the two laminate films. The thermally welded portion is indicated by reference numeral 42 in FIG. As a result, the electrode element 34 is wrapped with the exterior material 40. However, the leads 18 and 28 are pulled out from the exterior material 40. Here, one side 44 of the exterior material 40 is not sealed and forms an opening. The interior of the exterior material 40 can be accessed through this opening.
次に、図5に示すように、外装材40の内部へ電解液60を入れる(ステップS3)。このとき、外装材40の開口が重力方向Gとは反対の方向へ向けられていることが好ましい。電解液60を外装材40に入れるステップにおいて、一定の時間、例えば4時間程度、二次電池を放置しても良い。電解液60を注入した後、好ましくは真空状態にて、外装材40の、封着されていない一辺44を一時的に封着する(ステップS4)。これによって電極要素34を外装材60の全周で仮封止する(仮封止工程)。今後、仮封止工程で封着された外装材の一辺44を「仮封止部」と呼ぶことがある。この後、任意に、外装材40のしわをのばすステップを実施してもよい。
Next, as shown in FIG. 5, an electrolytic solution 60 is put into the exterior member 40 (step S3). At this time, it is preferable that the opening of the exterior material 40 is directed in a direction opposite to the gravity direction G. In the step of putting the electrolytic solution 60 into the exterior member 40, the secondary battery may be left for a certain time, for example, about 4 hours. After injecting the electrolytic solution 60, the unsealed one side 44 of the exterior material 40 is temporarily sealed, preferably in a vacuum state (step S4). As a result, the electrode element 34 is temporarily sealed along the entire circumference of the exterior material 60 (temporary sealing step). In the future, one side 44 of the exterior material sealed in the temporary sealing process may be referred to as a “temporary sealing portion”. Thereafter, a step of extending the wrinkles of the exterior material 40 may be optionally performed.
外装材40内に電解液を入れた後、外装材40の外側から電池要素34を所定の時間加圧する(ステップS5。以下、「加圧ステップ」と称することがある。)。電解液60の漏れを防ぐため、電極要素34を外装材40で仮封止した状態で電池要素34を加圧することが好ましい。具体的一例では、図6に示すように、1対の押し付け板70により二次電池50を挟み込み、これによって外装材40の外側から電池要素34を押圧することができる。なお、図6は、図5に示す矢印6Aの方向から見た二次電池50を示している。
After the electrolytic solution is put into the exterior material 40, the battery element 34 is pressurized from the outside of the exterior material 40 for a predetermined time (step S5. Hereinafter, it may be referred to as a “pressure step”). In order to prevent leakage of the electrolytic solution 60, it is preferable to pressurize the battery element 34 in a state where the electrode element 34 is temporarily sealed with the exterior material 40. In a specific example, as shown in FIG. 6, the secondary battery 50 is sandwiched between a pair of pressing plates 70, and thereby the battery element 34 can be pressed from the outside of the exterior material 40. 6 shows the secondary battery 50 viewed from the direction of the arrow 6A shown in FIG.
外装材40の外側から外装材40及び電池要素34を加圧することで、電極シート10,20とセパレータシート30との間の隙間の大きさや、セパレータシート30の微細孔の大きさを小さくすることができる。これにより、セパレータシート30への電解液60の浸み込みを促進することができると考えられる。特に、毛細管現象の毛管力が向上することによりセパレータシート30への電解液60の浸み込みを促進することができると考えられる。このように、セパレータシート30へ電解液60が十分に浸み込むことで、後の製造ステップ中でのガスの発生が抑制される。
By pressurizing the packaging material 40 and the battery element 34 from the outside of the packaging material 40, the size of the gap between the electrode sheets 10, 20 and the separator sheet 30 and the size of the fine holes of the separator sheet 30 are reduced. Can do. Thereby, it is considered that the penetration of the electrolytic solution 60 into the separator sheet 30 can be promoted. In particular, it is considered that the penetration of the electrolytic solution 60 into the separator sheet 30 can be promoted by improving the capillary force of the capillary phenomenon. As described above, the electrolyte 60 is sufficiently soaked into the separator sheet 30 to suppress the generation of gas during the subsequent manufacturing steps.
セパレータシート30の細孔へ電解液60を十分に染み込ませるために、電池要素34を18時間以上加圧することが好ましい。さらに、セパレータシート30の細孔へ電解液60を十分に染み込ませるため、複数の電極シート10,20が積層された方向Lにおいて最も大きい厚みを有する二次電池50の部分(エンボス部)48の、85%~100%の面積の領域が加圧されることが好ましい(図8も参照)。
In order to sufficiently infiltrate the electrolyte 60 into the pores of the separator sheet 30, it is preferable to pressurize the battery element 34 for 18 hours or more. Further, in order to sufficiently infiltrate the electrolyte 60 into the pores of the separator sheet 30, the portion (embossed portion) 48 of the secondary battery 50 having the largest thickness in the direction L in which the plurality of electrode sheets 10 and 20 are laminated. It is preferable that a region having an area of 85% to 100% is pressurized (see also FIG. 8).
次に、図7に示すように、電池要素を仮充電する(ステップS6)。任意に、仮充電後に放電を行ってもよい。なお、充電及び放電を、所定の回数繰り返してもよい。次に、外装材40の仮封止部46を解いて、外装材40内に発生したガスを除去する(ステップS7)。外装材40内に電解液60を入れてから、ステップS7でガスを除去するまでの間、二次電池50の姿勢を維持することが好ましい。より具体的には、外装材40内に電解液60を入れてから、ステップS7でガスを除去するまでの間、二次電池50を、仮封止部46を重力方向Gとは反対向き、すなわち鉛直上向きに保持した状態に維持する。これにより、外装材40の内部で発生したガスは仮封止部46付近に貯まる。したがって、仮封止部46を開放したときに、外装材40の内部のガスを効率的に除去することができる。
Next, as shown in FIG. 7, the battery element is temporarily charged (step S6). Optionally, discharging may be performed after temporary charging. Note that charging and discharging may be repeated a predetermined number of times. Next, the temporary sealing part 46 of the exterior material 40 is released, and the gas generated in the exterior material 40 is removed (step S7). It is preferable to maintain the posture of the secondary battery 50 after the electrolytic solution 60 is put in the outer packaging material 40 until the gas is removed in step S7. More specifically, after the electrolytic solution 60 is put in the outer packaging material 40 until the gas is removed in step S7, the secondary battery 50 is placed in a direction opposite to the gravitational direction G in the temporary sealing portion 46. That is, it is maintained in a state of being held vertically upward. Thereby, the gas generated inside the exterior material 40 is stored in the vicinity of the temporary sealing portion 46. Therefore, when the temporary sealing portion 46 is opened, the gas inside the exterior material 40 can be efficiently removed.
次に、電池要素34を外装材40で本封止する(ステップS8)。ここでは、外装材40が再び開かないように、電池要素34を気密に完全に封止することが好ましい。次に、電池要素34を充電する(ステップS9)。次に、二次電池50に対してエージング処理を実施する(ステップS10)。具体的には、二次電池50を所定の温度に加熱した状態で所定の時間放置する。このようにして、図8に示す二次電池50が得られる。
Next, the battery element 34 is finally sealed with the exterior material 40 (step S8). Here, it is preferable to hermetically and completely seal the battery element 34 so that the exterior member 40 does not open again. Next, the battery element 34 is charged (step S9). Next, an aging process is performed on the secondary battery 50 (step S10). Specifically, the secondary battery 50 is left to stand for a predetermined time while being heated to a predetermined temperature. In this way, the secondary battery 50 shown in FIG. 8 is obtained.
一般に、エージング処理中に外装材の内部にガスが発生することがある。このガスは、セパレータシート30への電解液60の染み込みが不十分であるときに発生すると考えられる。上記製造方法によれば、仮封止後に所定の時間、電池要素34を加圧することにより、セパレータシート30へ電解液60を十分に浸み込ませることができる。その結果、エージング処理中に外装材40の内部に発生するガスの量を抑制することができる。
Generally, gas may be generated inside the exterior material during the aging process. This gas is considered to be generated when the electrolyte solution 60 is not sufficiently soaked into the separator sheet 30. According to the said manufacturing method, the electrolyte solution 60 can fully be immersed in the separator sheet 30 by pressurizing the battery element 34 for a predetermined time after temporary sealing. As a result, the amount of gas generated in the exterior material 40 during the aging process can be suppressed.
[実施例]
本発明の一実施例におけるリチウムイオン二次電池と、比較例におけるリチウムイオン二次電池について、エージング処理後に発生したガスの量を比較した結果を以下に示す。本発明の実施例におけるリチウムイオン二次電池は、上述の方法により製造された。本実施例の二次電池は、外装材内に電解液を入れた後、外装材のエンボス部の面積の85%の領域を所定時間加圧した。一方、比較例の二次電池は、外装材内に電解液を入れた後、二次電池を加圧しなかった。実施例及び比較例ともに、複数のサンプルについて実験した。 [Example]
The results of comparing the amount of gas generated after the aging treatment for the lithium ion secondary battery in one example of the present invention and the lithium ion secondary battery in the comparative example are shown below. The lithium ion secondary battery in the Example of this invention was manufactured by the above-mentioned method. In the secondary battery of this example, the electrolytic solution was put in the exterior material, and then a region of 85% of the area of the embossed portion of the exterior material was pressurized for a predetermined time. On the other hand, the secondary battery of the comparative example did not pressurize the secondary battery after putting the electrolytic solution in the exterior material. In both examples and comparative examples, experiments were performed on a plurality of samples.
本発明の一実施例におけるリチウムイオン二次電池と、比較例におけるリチウムイオン二次電池について、エージング処理後に発生したガスの量を比較した結果を以下に示す。本発明の実施例におけるリチウムイオン二次電池は、上述の方法により製造された。本実施例の二次電池は、外装材内に電解液を入れた後、外装材のエンボス部の面積の85%の領域を所定時間加圧した。一方、比較例の二次電池は、外装材内に電解液を入れた後、二次電池を加圧しなかった。実施例及び比較例ともに、複数のサンプルについて実験した。 [Example]
The results of comparing the amount of gas generated after the aging treatment for the lithium ion secondary battery in one example of the present invention and the lithium ion secondary battery in the comparative example are shown below. The lithium ion secondary battery in the Example of this invention was manufactured by the above-mentioned method. In the secondary battery of this example, the electrolytic solution was put in the exterior material, and then a region of 85% of the area of the embossed portion of the exterior material was pressurized for a predetermined time. On the other hand, the secondary battery of the comparative example did not pressurize the secondary battery after putting the electrolytic solution in the exterior material. In both examples and comparative examples, experiments were performed on a plurality of samples.
表1は、エージング処理前の二次電池の体積とエージング処理後の二次電池の体積との比を示している。すなわち、表1は、エージング処理後の二次電池の体積増加率を示している。二次電池の体積増加は、主に、外装材の内部に発生したガスの量に起因する。
Table 1 shows the ratio between the volume of the secondary battery before the aging treatment and the volume of the secondary battery after the aging treatment. That is, Table 1 shows the volume increase rate of the secondary battery after the aging process. The increase in the volume of the secondary battery is mainly caused by the amount of gas generated inside the exterior material.
二次電池を加圧するステップを含む製造方法では、エージング処理中に発生したガスの量が抑制されていることがわかる。また、発生したガスの量のばらつきも小さくなった。これにより、加圧ステップを含む製造方法が、加圧ステップを有しない製造方法よりも有利であることがわかる。
It can be seen that in the manufacturing method including the step of pressurizing the secondary battery, the amount of gas generated during the aging process is suppressed. In addition, the variation in the amount of gas generated was reduced. Thereby, it turns out that the manufacturing method containing a pressurization step is more advantageous than the manufacturing method which does not have a pressurization step.
図9は、加圧ステップでの二次電池の加圧力と、エージング処理前後の二次電池の体積変化率との関係を示すグラフである。なお、加圧工程では、二次電池の外装材のエンボス部の85%の領域を18時間加圧した。図9に示すグラフから、6.5kgf/cm2以上の力で二次電池を加圧すると、エージング処理前後の二次電池の体積変化率が著しく低下することがわかる。この体積変化率の低下は、外装材内のガスの発生が抑制されたことを意味している。したがって、加圧ステップでは、6.5kgf/cm2(約0.64N/mm2)以上の力で外装材の外側から電池要素を加圧することが好ましい。また、外装材の強度の限界という観点から、加圧力は7.3kgf/cm2(約0.72N/mm2)以下の力であることが好ましい。
FIG. 9 is a graph showing the relationship between the applied pressure of the secondary battery in the pressurizing step and the volume change rate of the secondary battery before and after the aging treatment. In the pressurization step, 85% of the embossed portion of the secondary battery exterior material was pressurized for 18 hours. From the graph shown in FIG. 9, it can be seen that when the secondary battery is pressurized with a force of 6.5 kgf / cm 2 or more, the volume change rate of the secondary battery before and after the aging treatment is significantly reduced. This decrease in the volume change rate means that the generation of gas in the exterior material is suppressed. Therefore, in the pressurizing step, it is preferable to pressurize the battery element from the outside of the exterior member with a force of 6.5 kgf / cm 2 (about 0.64 N / mm 2 ) or more. Further, from the viewpoint of the limit of the strength of the exterior material, the applied pressure is preferably a force of 7.3 kgf / cm 2 (about 0.72 N / mm 2 ) or less.
以上、本発明の望ましい実施形態について提示し、詳細に説明したが、本発明は上記実施形態に限定されるものではなく、要旨を逸脱しない限り、さまざまな変更及び修正が可能であることを理解されたい。
Although the preferred embodiments of the present invention have been presented and described in detail above, the present invention is not limited to the above-described embodiments, and it is understood that various changes and modifications can be made without departing from the gist. I want to be.
この出願は、2014年3月25日に出願された日本国特許出願番号第2014-61873号を基礎とする優先権を主張し、参照によりその開示の全てをここに取り込む。
This application claims priority based on Japanese Patent Application No. 2014-61873 filed on Mar. 25, 2014, the entire disclosure of which is incorporated herein by reference.
10 正極シート
20 負極シート
30 セパレータシート
34 電池要素
40 外装材
50 二次電池
60 電解液 DESCRIPTION OFSYMBOLS 10 Positive electrode sheet 20 Negative electrode sheet 30 Separator sheet 34 Battery element 40 Exterior material 50 Secondary battery 60 Electrolyte
20 負極シート
30 セパレータシート
34 電池要素
40 外装材
50 二次電池
60 電解液 DESCRIPTION OF
Claims (10)
- 複数の電極シートと、互いに隣接する前記電極シートの間に配置されたセパレータシートと、を有する電池要素を、外装材で包むことと、
前記外装材内に電解液を入れることと、
前記外装材内に前記電解液を入れた後に、前記外装材の外側から前記電池要素を所定の時間加圧することと、を有する二次電池の製造方法。 Wrapping a battery element having a plurality of electrode sheets and a separator sheet disposed between the electrode sheets adjacent to each other with an exterior material;
Putting an electrolyte in the exterior material;
A method for producing a secondary battery, comprising: pressing the battery element for a predetermined time from the outside of the exterior material after putting the electrolyte in the exterior material. - 前記電池要素は、前記電池要素を前記外装材の全周で仮封止した状態で前記所定の時間加圧される、請求項1に記載の二次電池の製造方法。 2. The method of manufacturing a secondary battery according to claim 1, wherein the battery element is pressurized for the predetermined time in a state in which the battery element is temporarily sealed around the entire periphery of the exterior material.
- 前記所定の時間は18時間以上の時間である、請求項1又は2に記載の二次電池の製造方法。 The method for manufacturing a secondary battery according to claim 1 or 2, wherein the predetermined time is 18 hours or more.
- 前記電池要素は、0.64N/mm2以上の力で前記外装材の外側から加圧される、請求項1から3のいずれか1項に記載の二次電池の製造方法。 4. The method of manufacturing a secondary battery according to claim 1, wherein the battery element is pressed from the outside of the exterior member with a force of 0.64 N / mm 2 or more. 5.
- 前記電池要素と前記電池要素を包む前記外装材とを含む二次電池の、前記複数の電極シートが積層された方向において最も大きい厚みを有する部分の85%~100%の面積の領域が、加圧される、請求項1から4のいずれか1項に記載の二次電池の製造方法。 An area having an area of 85% to 100% of a portion having the largest thickness in the direction in which the plurality of electrode sheets are laminated of a secondary battery including the battery element and the exterior material that wraps the battery element is added. The manufacturing method of the secondary battery of any one of Claim 1 to 4 pressed.
- 前記セパレータは多孔性フィルムから構成される、請求項1から5のいずれか1項に記載の二次電池の製造方法。 The method for manufacturing a secondary battery according to any one of claims 1 to 5, wherein the separator is made of a porous film.
- 前記外装材は、可撓性を有するラミネートフィルムである、請求項1から6のいずれか1項に記載の二次電池の製造方法。 The method for manufacturing a secondary battery according to any one of claims 1 to 6, wherein the exterior material is a laminate film having flexibility.
- 前記電池要素を所定の時間加圧した後に、前記電池要素を仮充電することと、
前記外装材の仮封止を解いて、前記外装材の内部に生じたガスを除去することと、
前記電池要素を前記外装材の全周で本封止することと、をこの順にさらに有する、請求項2に記載の二次電池の製造方法。 Pre-charging the battery element after pressurizing the battery element for a predetermined time; and
Removing the temporary sealing of the exterior material and removing the gas generated inside the exterior material;
The method for manufacturing a secondary battery according to claim 2, further comprising: main-sealing the battery element along the entire circumference of the exterior material. - 前記電解液は、前記電池要素及び前記外装材が前記外装材の開いた一辺を鉛直上向きに向けて保持された状態で前記外装材の内部へ入れられ、
前記外装材内に電解液を入れてから、前記外装材の内部に生じたガスを前記外装材へ除去するまでの間、前記電池要素及び前記外装材の姿勢を維持する、請求項8に記載の二次電池の製造方法。 The electrolytic solution is put into the exterior material in a state where the battery element and the exterior material are held with the open side of the exterior material facing vertically upward,
The posture of the battery element and the exterior material is maintained from the time when the electrolytic solution is put into the exterior material until the gas generated in the exterior material is removed to the exterior material. Of manufacturing a secondary battery. - 前記電池要素を前記外装材で本封止した後に、前記二次電池に対してエージング処理を実施することをさらに有する、請求項8又は9に記載の二次電池の製造方法。
The secondary battery manufacturing method according to claim 8, further comprising performing an aging process on the secondary battery after the battery element is fully sealed with the exterior material.
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