JP7043793B2 - How to manufacture a secondary battery - Google Patents

How to manufacture a secondary battery Download PDF

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JP7043793B2
JP7043793B2 JP2017213782A JP2017213782A JP7043793B2 JP 7043793 B2 JP7043793 B2 JP 7043793B2 JP 2017213782 A JP2017213782 A JP 2017213782A JP 2017213782 A JP2017213782 A JP 2017213782A JP 7043793 B2 JP7043793 B2 JP 7043793B2
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housing
secondary battery
lid
electrolytic solution
bag
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JP2019087371A (en
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雄太 根本
友寛 大野
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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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  • Secondary Cells (AREA)

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.

二次電池の製造方法として、筐体内に電解液を満たす方法がられている。
例えば、特許文献１には、電解液を内包する袋体を筐体内に配置し、蓋体の押圧を用いて袋体を破裂させ、電解液によって筐体内を満たす方法が開示されている。 As a method of manufacturing a secondary battery, a method of filling a housing with an electrolytic solution is used.
For example, Patent Document 1 discloses a method in which a bag containing an electrolytic solution is arranged in a housing, the bag is ruptured by pressing the lid, and the inside of the housing is filled with the electrolytic solution.

特開昭６３－０８６２７３号公報Japanese Unexamined Patent Publication No. 63-086273

発明者は、二次電池の製造方法に関し、以下の課題を見出した。
特許文献１に開示されている二次電池の製造方法では、電解液を内包する袋体を筐体内において破裂させた後に、筐体の接合部と蓋体の接合部とを接合している。しかしながら、袋体を破裂させる際に電解液が飛び散るため、筐体の接合部及び蓋体の接合部に電解液が付着する恐れがある。 The inventor has found the following problems regarding the method for manufacturing a secondary battery.
In the method for manufacturing a secondary battery disclosed in Patent Document 1, a bag containing an electrolytic solution is burst in the housing, and then the joint portion of the housing and the joint portion of the lid are joined. However, since the electrolytic solution is scattered when the bag body is ruptured, the electrolytic solution may adhere to the joint portion of the housing and the joint portion of the lid body.

本発明は、このような問題点に鑑みなされたものであり、筐体の接合部及び蓋体の接合部に電解液が付着することなく、電解液によって筐体内を満たすことができる二次電池の製造方法を提供することを目的とする。 The present invention has been made in view of such problems, and a secondary battery capable of filling the inside of a housing with an electrolytic solution without the electrolytic solution adhering to the joint portion of the housing and the joint portion of the lid. It is an object of the present invention to provide the manufacturing method of.

本発明の一態様に係る二次電池の製造方法は、電極体と、前記電極体を格納する筐体と、前記筐体に接合される蓋体と、前記電極体と前記筐体の外側とを接続する端子と、を備える二次電池の製造方法であって、前記筐体内に、電解液を内包する袋体を配置する工程と、前記袋体が配置された前記筐体に、前記蓋体を接合し、前記筐体を密閉する工程と、密閉された前記筐体内において、前記袋体を破裂させ、前記電解液によって前記筐体内を満たす工程と、を備える。 A method for manufacturing a secondary battery according to one aspect of the present invention includes an electrode body, a housing for storing the electrode body, a lid body joined to the housing, and the electrode body and the outside of the housing. A method of manufacturing a secondary battery including a terminal for connecting the above, wherein a bag body containing an electrolytic solution is arranged in the housing, and a lid is placed in the housing in which the bag body is arranged. The present invention includes a step of joining the bodies and sealing the housing, and a step of bursting the bag and filling the inside of the housing with the electrolytic solution in the sealed housing.

本発明に係る二次電池の製造方法は、袋体が配置された筐体に、蓋体を接合し、筐体を密閉する工程と、密閉された筐体内において、袋体を破裂させ、電解液によって筐体内を満たす工程と、を備える。つまり、筐体に蓋体を接合した後に袋体を破裂させているため、接合する際に電解液が筐体の接合部及び蓋体の接合部に付着する恐れがない。このような構成により、筐体の接合部及び蓋体の接合部に電解液が付着することなく、電解液によって筐体内を満たすことができる。 The method for manufacturing a secondary battery according to the present invention includes a step of joining a lid to a housing in which a bag is arranged and sealing the housing, and a process of bursting the bag and electrolyzing the battery in the sealed housing. A process of filling the inside of the housing with a liquid is provided. That is, since the bag body is ruptured after the lid body is joined to the housing, there is no possibility that the electrolytic solution adheres to the joint portion of the housing and the joint portion of the lid body at the time of joining. With such a configuration, the inside of the housing can be filled with the electrolytic solution without the electrolytic solution adhering to the joint portion of the housing and the joint portion of the lid.

本発明により、筐体の接合部及び蓋体の接合部に電解液が付着することなく、電解液によって筐体内を満たすことができる二次電池の製造方法を提供することができる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for manufacturing a secondary battery capable of filling the inside of a housing with an electrolytic solution without the electrolytic solution adhering to the joint portion of the housing and the joint portion of the lid.

第１の実施の形態に係る二次電池の断面図である。It is sectional drawing of the secondary battery which concerns on 1st Embodiment. 第１の実施の形態に係る二次電池の製造方法のフローチャートである。It is a flowchart of the manufacturing method of the secondary battery which concerns on 1st Embodiment. 第２の実施の形態に係る二次電池の断面図である。It is sectional drawing of the secondary battery which concerns on 2nd Embodiment.

以下、図面を参照して本発明の実施の形態について説明する。ただし、本発明が以下の実施の形態に限定される訳ではない。また、説明を明確にするため、以下の記載及び図面は、適宜、簡略化されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified.

（第１の実施の形態）
まず、図１を参照して、第１の実施の形態に係る二次電池の製造方法を用いて製造される二次電池１の構成について説明する。
図１は、第１の実施の形態に係る二次電池１の断面図である。図１に示すように、二次電池１は、電極体２、筐体３、蓋体４、及び端子５１及び５２を備える。蓋体４は、貫通孔４２及びフィルター４３を有する。二次電池１は、例えば、複数組み合わせられて容量の大きな１つの二次電池として用いられる。 (First Embodiment)
First, with reference to FIG. 1, the configuration of the secondary battery 1 manufactured by using the method for manufacturing the secondary battery according to the first embodiment will be described.
FIG. 1 is a cross-sectional view of the secondary battery 1 according to the first embodiment. As shown in FIG. 1, the secondary battery 1 includes an electrode body 2, a housing 3, a lid body 4, and terminals 51 and 52. The lid 4 has a through hole 42 and a filter 43. The secondary battery 1 is used, for example, as one secondary battery having a large capacity in combination of a plurality.

図１に示すように、二次電池１では、電極体２が筐体３内に格納されている。電極体２は、例えば、正極材が塗工された正極シートと、負極材が塗工された負極シートと、がセパレータを介して交互に積層された構造体である。筐体３は、例えば、矩形状の箱型であり、内部に角型の収容空間を備える。筐体３は、筐体３の開口部に蓋体４が接合され、密閉される。具体的には、筐体３の接合部３１と蓋体４の接合部３１とが接合され、密閉される。接合方法は特に限定されないが、例えば、溶接、溶着、又は接着を用いて接合される。蓋体４は、矩形の板状部材である。筐体３及び蓋体４は、例えば、アルミニウム、スチール等の金属材料を用いて構成される。また、筐体３及び蓋体４は、例えば、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリイミド樹脂等の樹脂材料を用いて構成されても良い。 As shown in FIG. 1, in the secondary battery 1, the electrode body 2 is housed in the housing 3. The electrode body 2 is, for example, a structure in which a positive electrode sheet coated with a positive electrode material and a negative electrode sheet coated with a negative electrode material are alternately laminated via a separator. The housing 3 has, for example, a rectangular box shape and has a square storage space inside. The housing 3 is sealed by joining the lid 4 to the opening of the housing 3. Specifically, the joint portion 31 of the housing 3 and the joint portion 31 of the lid 4 are joined and sealed. The joining method is not particularly limited, but for example, welding, welding, or adhesion is used for joining. The lid 4 is a rectangular plate-shaped member. The housing 3 and the lid 4 are made of, for example, a metal material such as aluminum or steel. Further, the housing 3 and the lid 4 may be configured by using a resin material such as polyphenylene sulfide resin (PPS) or polyimide resin.

電極体２は、２つの端子５１及び５２に接続されており、２つの端子５１及び５２は、筐体３の内側から外側に延設されている。電極体２の一方の端には、正極材が塗工されていない正極シートの領域が突出しており、端子５１は、直接又はリード部材（不図示）を介して正極材が塗工されていない正極シートの領域に接続されている。電極体２の他方の端には、負極材が塗工されていない負極シートの領域が突出しており、端子５２は、直接又はリード部材を介して負極材が塗工されていない負極シートの領域に接続されている。つまり、端子５１は正極であり、端子５２は負極である。外側の端は筐体３又は蓋体４を貫通して接続されている。したがって、端子５１及び５２は、電極体２と筐体３の外側とを接続している。 The electrode body 2 is connected to two terminals 51 and 52, and the two terminals 51 and 52 extend from the inside to the outside of the housing 3. A region of the positive electrode sheet not coated with the positive electrode material protrudes from one end of the electrode body 2, and the terminal 51 is not coated with the positive electrode material directly or via a lead member (not shown). It is connected to the area of the positive electrode sheet. A region of the negative electrode sheet not coated with the negative electrode material protrudes from the other end of the electrode body 2, and the terminal 52 is a region of the negative electrode sheet not coated with the negative electrode material directly or via a lead member. It is connected to the. That is, the terminal 51 is a positive electrode, and the terminal 52 is a negative electrode. The outer end is connected through the housing 3 or the lid 4. Therefore, the terminals 51 and 52 connect the electrode body 2 and the outside of the housing 3.

筐体３内には、電解液を内包する袋体６が配置されている。後に詳述するが、本発明においては、袋体を破裂させることによって、電解液によって筐体３内を満たす。そして、電極体２は、電解液によって含浸される。端子５１及び５２が導線（不図示）に接続されると、電極体２から端子５１及び５２を介して外部に通電する。 A bag body 6 containing an electrolytic solution is arranged in the housing 3. As will be described in detail later, in the present invention, the inside of the housing 3 is filled with the electrolytic solution by bursting the bag body. Then, the electrode body 2 is impregnated with the electrolytic solution. When the terminals 51 and 52 are connected to a conducting wire (not shown), the electrode body 2 energizes the outside via the terminals 51 and 52.

更に、蓋体４には、貫通孔４２が設けられていても良い。貫通孔４２を介して、袋体６に針を刺し、袋体６を破裂させると、電解液によって筐体３内を満たすことができる。また、貫通孔４２は、通気孔としても機能する。なお、図１においては、蓋体に貫通孔４２を設ける場合について図示したが、貫通孔４２を設ける位置は、筐体３内と外部とを貫通する位置であれば限定されず、例えば、筐体３に貫通孔４２を設けても良い。また、貫通孔４２から筐体３内に異物が混入することを防ぐために、貫通孔４２の内側にフィルター４３が貼付されることが好ましい。フィルター４３は、例えば、不織布を用いて構成される。 Further, the lid 4 may be provided with a through hole 42. When the bag body 6 is pierced with a needle through the through hole 42 and the bag body 6 is ruptured, the inside of the housing 3 can be filled with the electrolytic solution. The through hole 42 also functions as a ventilation hole. Although the case where the through hole 42 is provided in the lid is shown in FIG. 1, the position where the through hole 42 is provided is not limited as long as it penetrates the inside and the outside of the housing 3, for example, the housing. A through hole 42 may be provided in the body 3. Further, in order to prevent foreign matter from entering the housing 3 from the through hole 42, it is preferable that the filter 43 is attached to the inside of the through hole 42. The filter 43 is constructed using, for example, a non-woven fabric.

次に、図２に示すフローチャートを参照して、第１の実施の形態に係る二次電池の製造方法について、具体的に説明する。 Next, the method for manufacturing the secondary battery according to the first embodiment will be specifically described with reference to the flowchart shown in FIG.

まず、ステップＳ１において、筐体３内に袋体６を配置する。図１においては、電極体２と蓋体４とに挟持されるように袋体６が配置される場合を図示したが、袋体６が配置される位置は、筐体３内であれば制限されず、例えば、電極体２と筐体３とに挟持される位置であっても良い。 First, in step S1, the bag body 6 is arranged in the housing 3. In FIG. 1, the case where the bag body 6 is arranged so as to be sandwiched between the electrode body 2 and the lid body 4 is shown, but the position where the bag body 6 is arranged is limited as long as it is inside the housing 3. However, for example, the position may be such that it is sandwiched between the electrode body 2 and the housing 3.

次に、ステップＳ２において、袋体６が配置された筐体３に蓋体４を接合し、筐体３を密閉する。具体的には、筐体３の接合部３１と蓋体４の接合部４１とを、例えば、溶接することによって、筐体３を密閉する。 Next, in step S2, the lid 4 is joined to the housing 3 in which the bag 6 is arranged, and the housing 3 is sealed. Specifically, the housing 3 is sealed by, for example, welding the joint portion 31 of the housing 3 and the joint portion 41 of the lid body 4.

続いて、ステップＳ３において、密閉された筐体３内において、袋体６を破裂させ、電解液によって筐体３内を満たす。具体的には、例えば、袋体６に貫通孔４２を介して針を刺し、袋体６を破裂させる。したがって、貫通孔４２は、針が通過できる大きさの直径の孔であれば十分である。例えば、貫通孔４２を介して電解液を注入する場合に比較して、貫通孔４２の直径を小さくすることができるため、貫通孔４２からの異物混入を抑えることができる。また、貫通孔４２の内側にフィルター４３を貼付すると、貫通孔４２からの異物混入をより抑えることができる。袋体６は、電解液への十分な耐性及び強度を有する材料を用いて構成されることが望ましい。袋体６は、例えば、ポリプロピレン（ＰＰ）を用いて構成される。 Subsequently, in step S3, the bag body 6 is burst in the sealed housing 3, and the inside of the housing 3 is filled with the electrolytic solution. Specifically, for example, the bag body 6 is pierced with a needle through the through hole 42 to burst the bag body 6. Therefore, it is sufficient that the through hole 42 has a diameter that allows the needle to pass through. For example, the diameter of the through hole 42 can be reduced as compared with the case where the electrolytic solution is injected through the through hole 42, so that foreign matter can be suppressed from entering through the through hole 42. Further, if the filter 43 is attached to the inside of the through hole 42, it is possible to further suppress the contamination of foreign matter from the through hole 42. It is desirable that the bag body 6 is made of a material having sufficient resistance and strength to the electrolytic solution. The bag body 6 is made of polypropylene (PP), for example.

第１の実施の形態では、袋体６を破裂させる前に蓋体４を筐体３に接合している。したがって、接合部３１及び接合部４１に電解液が付着することなく、蓋体４を筐体３に接合することができる。したがって、蓋体４を筐体３に接合する際に、接合不良が起こりにくい。 In the first embodiment, the lid 4 is joined to the housing 3 before the bag 6 is ruptured. Therefore, the lid 4 can be joined to the housing 3 without the electrolytic solution adhering to the joint portion 31 and the joint portion 41. Therefore, when the lid 4 is joined to the housing 3, poor joining is unlikely to occur.

（第２の実施の形態）
次に、図３を参照して、第２の実施の形態に係る二次電池の製造方法を用いて製造される二次電池１０の構成について説明する。 (Second embodiment)
Next, with reference to FIG. 3, the configuration of the secondary battery 10 manufactured by using the method for manufacturing the secondary battery according to the second embodiment will be described.

図３は、第２の実施の形態に係る二次電池１０の断面図である。図３に示すように、二次電池１０は、安全装置７を備える。二次電池１０は、安全装置７を備えているため、大きな容量を要する車載用二次電池に好適である。 FIG. 3 is a cross-sectional view of the secondary battery 10 according to the second embodiment. As shown in FIG. 3, the secondary battery 10 includes a safety device 7. Since the secondary battery 10 includes the safety device 7, it is suitable for an in-vehicle secondary battery that requires a large capacity.

安全装置７は、ＣＩＤ（Ｃｕｒｒｅｎｔ Ｉｎｔｅｒｒｕｐｔ Ｄｅｖｉｃｅ、電流遮断デバイス）であり、筐体３内の圧力が所定の値よりも大きくなった場合に、電流を遮断する。安全装置７は、例えば、電極体２の上部において端子５１に接続され、電極体２と蓋体４との間に間隙を生じる。そこで、電極体２と蓋体４との間に生じた間隙に袋体６を配置すると、電極体２と蓋体４との間に生じた間隙を有効に活用することができ、好ましい。 The safety device 7 is a CID (Current Interrupt Device, current cutoff device), and cuts off the current when the pressure in the housing 3 becomes larger than a predetermined value. The safety device 7 is connected to the terminal 51 at the upper part of the electrode body 2, for example, and creates a gap between the electrode body 2 and the lid body 4. Therefore, if the bag body 6 is arranged in the gap formed between the electrode body 2 and the lid body 4, the gap formed between the electrode body 2 and the lid body 4 can be effectively utilized, which is preferable.

以上で説明した本実施の形態に係る発明により、筐体の接合部及び蓋体の接合部に電解液が付着することなく、電解液によって筐体内を満たすことができる二次電池の製造方法を提供することができる。 According to the invention according to the present embodiment described above, a method for manufacturing a secondary battery capable of filling the inside of a housing with an electrolytic solution without adhering the electrolytic solution to the joint portion of the housing and the joint portion of the lid can be obtained. Can be provided.

なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。 The present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit.

例えば、袋体６を高温下において溶融する材料を用いて構成し、ステップＳ３において二次電池１を加熱することによって袋体６を破裂させても良い。加熱によって袋体６を破裂させる場合、貫通孔４２を設ける必要がないため、外部からの異物の混入をより防ぐことができる。また、二次電池１に、高温下において乾燥させる乾燥工程を施す場合、ステップＳ３と乾燥工程とを同時に行うと、工程数を削減することができ、好ましい。 For example, the bag body 6 may be configured by using a material that melts at a high temperature, and the bag body 6 may be burst by heating the secondary battery 1 in step S3. When the bag body 6 is ruptured by heating, it is not necessary to provide the through hole 42, so that it is possible to further prevent foreign matter from entering from the outside. Further, when the secondary battery 1 is subjected to a drying step of drying at a high temperature, it is preferable to perform the step S3 and the drying step at the same time because the number of steps can be reduced.

１、１０ 二次電池
２ 電極体
３ 筐体
３１ 接合部
４ 蓋体
４１ 接合部
４３ フィルター
５１、５２ 端子
６ 袋体
７ 安全装置 1, 10 Rechargeable battery 2 Electrode body 3 Housing 31 Joint part 4 Lid body 41 Joint part 43 Filter 51, 52 Terminal 6 Bag body 7 Safety device

Claims (3)

電極体と、前記電極体を格納する筐体と、前記筐体に接合される蓋体と、前記電極体と前記筐体の外側とを接続する端子と、を備える二次電池の製造方法であって、
前記蓋体が、通気孔として機能する貫通孔と、前記貫通孔を前記二次電池の内側から被覆するフィルターと、を備え、
前記筐体内に、電解液を内包する袋体を配置する工程と、
前記袋体が配置された前記筐体に、前記蓋体を接合し、前記筐体を密閉する工程と、
密閉された前記筐体内において、外部から前記貫通孔に針を挿入して前記袋体を破裂させ、前記電解液によって前記筐体内を満たす工程と、を備える二次電池の製造方法。 A method for manufacturing a secondary battery including an electrode body, a housing for storing the electrode body, a lid body joined to the housing, and a terminal for connecting the electrode body and the outside of the housing. There,
The lid comprises a through hole that functions as a vent and a filter that covers the through hole from the inside of the secondary battery.
The step of arranging the bag body containing the electrolytic solution in the housing, and
A step of joining the lid body to the housing in which the bag body is arranged and sealing the housing.
A method for manufacturing a secondary battery , comprising a step of inserting a needle into the through hole from the outside to burst the bag body and filling the inside of the housing with the electrolytic solution in the sealed housing. 電極体と、前記電極体を格納する筐体と、前記筐体に接合される蓋体と、前記電極体と前記筐体の外側とを接続する端子と、を備える二次電池の製造方法であって、
前記筐体内に、高温下において溶融する材料を用いて構成され、電解液を内包する袋体を配置する工程と、
前記袋体が配置された前記筐体に、前記蓋体を接合し、前記筐体を密閉する工程と、
前記蓋体が接合された前記筐体を高温で乾燥させる工程と、を備え、
前記筐体を高温で乾燥させる工程において、前記袋体を溶融させることによって破裂させ、前記電解液によって前記筐体内を満たす、
二次電池の製造方法。 A method for manufacturing a secondary battery including an electrode body, a housing for storing the electrode body, a lid body joined to the housing, and a terminal for connecting the electrode body and the outside of the housing. There,
A step of arranging a bag body which is composed of a material that melts at a high temperature and contains an electrolytic solution in the housing.
A step of joining the lid body to the housing in which the bag body is arranged and sealing the housing.
A step of drying the housing to which the lid is joined at a high temperature is provided.
In the step of drying the housing at a high temperature, the bag is burst by melting and the inside of the housing is filled with the electrolytic solution.
How to manufacture a secondary battery. 前記二次電池が、前記蓋体と前記電極体との間に設置される安全装置をさらに備え、
前記安全装置を設置したことで生じる前記蓋体と前記電極体との間隙に、前記袋体を配置する、
請求項１又は２に記載の二次電池の製造方法。 The secondary battery further comprises a safety device installed between the lid and the electrode.
The bag body is arranged in the gap between the lid body and the electrode body caused by installing the safety device.
The method for manufacturing a secondary battery according to claim 1 or 2.
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