JP2008103240A - Method of manufacturing battery - Google Patents
Method of manufacturing battery Download PDFInfo
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- JP2008103240A JP2008103240A JP2006286075A JP2006286075A JP2008103240A JP 2008103240 A JP2008103240 A JP 2008103240A JP 2006286075 A JP2006286075 A JP 2006286075A JP 2006286075 A JP2006286075 A JP 2006286075A JP 2008103240 A JP2008103240 A JP 2008103240A
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- battery
- opening
- exterior body
- clip
- exterior
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 230000008602 contraction Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 30
- 239000007789 gas Substances 0.000 description 29
- 239000010410 layer Substances 0.000 description 16
- 239000003792 electrolyte Substances 0.000 description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 13
- 229910001416 lithium ion Inorganic materials 0.000 description 13
- 238000003860 storage Methods 0.000 description 12
- 238000003825 pressing Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920005672 polyolefin resin Polymers 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004840 adhesive resin Substances 0.000 description 2
- 229920006223 adhesive resin Polymers 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910013290 LiNiO 2 Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 229910021437 lithium-transition metal oxide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
Description
本発明は、電池の製造方法に関する。 The present invention relates to a battery manufacturing method.
リチウムイオン電池とは、リチウム二次電池ともいわれ、液状、ゲル状および高分子ポリマー状の電解質を持ち、正極・負極活物質が高分子ポリマーからなるものを含むものである。 The lithium ion battery is also referred to as a lithium secondary battery, and includes a battery having a liquid, gel-like, and polymer-like electrolyte, and a positive electrode / negative electrode active material made of a polymer.
このリチウムイオン電池の外装体には、近年、形状の自由度が高い積層体からなる外装体を用いる傾向にあり、積層体の材質構成は、少なくとも基材層、バリア層、ヒートシール層と前記各層を接着する接着層である。具体的な例としては、積層体の少なくとも片面をプレス成形して電池収納部を形成してそこに電池本体を収納し、周縁の必要部分をヒートシールしてリチウムイオン電池となる。 In recent years, for the exterior body of this lithium ion battery, there is a tendency to use an exterior body made of a laminate having a high degree of freedom in shape, and the material composition of the laminate is at least a base material layer, a barrier layer, a heat seal layer, and the aforementioned It is an adhesive layer for bonding each layer. As a specific example, at least one surface of the laminate is press-molded to form a battery housing portion, the battery body is housed therein, and a necessary portion at the periphery is heat sealed to form a lithium ion battery.
このとき電池本体とは、正極活物質及び正極集電体から成る正極と、負極活物質及び負極集電体から成る負極と、正極及び負極間に充填される電解質とを含むセル（蓄電部）と、セル内の正極及び負極に連結されるとともに先端が外装体の外部に突出する金属端子から構成されており、充電時には正極活物質であるリチウム遷移金属酸化物中のリチウム原子（Ｌｉ）がリチウムイオン（Ｌｉ+）となって負極の炭素層間に入り込み（インターカレーション）、放電時にはリチウムイオン（Ｌｉ+）が炭素層間から離脱（デインターカレーション）して正極に移動し、元のリチウム化合物となることにより充放電反応が進行する。 In this case, the battery body is a cell (power storage unit) including a positive electrode made of a positive electrode active material and a positive electrode current collector, a negative electrode made of a negative electrode active material and a negative electrode current collector, and an electrolyte filled between the positive electrode and the negative electrode. And a metal terminal connected to the positive electrode and the negative electrode in the cell and having a tip protruding outside the exterior body, and during charging, lithium atoms (Li) in the lithium transition metal oxide that is a positive electrode active material Lithium ions (Li + ) enter the carbon layer of the negative electrode (intercalation), and during discharge, lithium ions (Li + ) leave the carbon layer (deintercalation) and move to the positive electrode, and the original lithium The charge / discharge reaction proceeds by becoming a compound.
しかし、この充放電反応において、水素や酸素等のガスが発生するため、外装体内部に電池本体を密封収納したとき、外装体内部のガス圧が上昇し膨張する可能性がある。特に初期充電において、ガスの発生量が多いため、電池本体を外装体に密封収納した後、初期充電を行うと、外装体内部で大量のガスが発生し、場合によってはリチウムイオン電池が破裂する可能性がある。したがって、少なくとも初期充電時に発生する多量のガスを外装体外部へ放出した後、電池本体を密封しなければならない。 However, in this charge / discharge reaction, gas such as hydrogen and oxygen is generated, and therefore, when the battery body is hermetically housed inside the exterior body, the gas pressure inside the exterior body may rise and expand. In particular, since the amount of gas generated is large in the initial charging, when the initial charging is performed after the battery body is hermetically sealed in the exterior body, a large amount of gas is generated inside the exterior body, and in some cases, the lithium ion battery bursts. there is a possibility. Therefore, the battery body must be sealed after releasing a large amount of gas generated at least during initial charging to the outside of the exterior body.
また、初期充電を外装体が開口した状態で行なうと、発生するガスとともに電解質が噴出したり、外装体外部から内部に水蒸気が浸入する可能性がある。このため、外装体内部の密封性をある程度保ちながら初期充電を行う必要がある。 In addition, when the initial charging is performed in a state in which the exterior body is opened, there is a possibility that the electrolyte is ejected together with the generated gas, or water vapor enters the interior from the exterior of the exterior body. For this reason, it is necessary to perform initial charging while maintaining a certain degree of hermetic sealing inside the exterior body.
従来、この問題を解決するために、外装体の一部に電池本体の収納空間とあわせてガスを貯める予備空間を設ける方法が提案されていた（特許文献１参照）。この方法によると、外装体に電池本体を密封収納し、初期充電を行うため、電解質の噴出等の問題はなく、発生するガスも前記予備空間に貯まり、初期充電時、外装体の破裂を防ぐことができた。 Conventionally, in order to solve this problem, a method has been proposed in which a spare space for storing gas is provided in a part of the exterior body together with the storage space of the battery body (see Patent Document 1). According to this method, since the battery main body is hermetically stored in the exterior body and the initial charge is performed, there is no problem such as the ejection of electrolyte, and the generated gas is also stored in the spare space, preventing the exterior body from bursting during the initial charge. I was able to.
しかし、この予備空間は電池製造工程においてのみ必要な空間であり、初期充電後、リチウムイオン電池から切り離して捨てるものであるため、この部分に無駄なコストがかり効率が悪かった。また、この予備空間となる部分が積層体のプレス成形性を低下させるという問題もあった。
そこで、本発明は上記方法を改良し、電池の製造工程における初期充電で発生するガスを効率よく外装体外部に放出するとともに、使用する積層体面積を最小限に抑え、効率的な電池の製造方法を提供することを目的とする。 Therefore, the present invention improves the above-described method, efficiently releases the gas generated by the initial charging in the battery manufacturing process to the outside of the exterior body, minimizes the area of the stacked body to be used, and efficiently manufactures the battery. It aims to provide a method.
上記目的を達成するために、本発明は、外装体の一部に開口部を設けて電池本体を封入する第１工程と、前記開口部を仮閉口する第２工程と、前記電池本体の初期充電を行う第３工程と、前記開口部を封止する第４工程とを備える電池の製造工程において、前記第２工程は、前記開口部を外装体外部からクリップで挟持して仮閉口することを特徴とする電池の製造方法である。 In order to achieve the above object, the present invention provides a first step in which an opening is provided in a part of an exterior body to enclose a battery body, a second step in which the opening is temporarily closed, and an initial stage of the battery body. In a battery manufacturing process comprising a third step of charging and a fourth step of sealing the opening, the second step is to temporarily close the opening by holding the opening with a clip from outside the exterior body. Is a method for producing a battery.
また本発明は、上記電池の製造方法において、前記クリップは弾性体の反発力又は収縮力を利用して前記外装体を挟持することを特徴とする。 According to the present invention, in the battery manufacturing method, the clip sandwiches the exterior body using a repulsive force or contraction force of an elastic body.
また本発明は、上記電池の製造方法において、前記外装体外部を挟持する前記クリップの挟持部に樹脂層を設けたことを特徴とする。 The present invention is also characterized in that, in the battery manufacturing method, a resin layer is provided on a holding portion of the clip that holds the exterior of the exterior body.
本発明の第１の構成によると、外装体の収納空間に一部開口部を設けて電池本体を封入し、その開口部を外装体外部からクリップで挟持して仮閉口することで、外装体内部は一定の密封性が確保され、外装体外部からの水蒸気の浸入を防ぐことができる。また、初期充電においてガスが発生し、外装体内部のガス圧が上昇したとき、クリップで挟持された開口部は完全に封止されているわけではなく、物理的な力で閉口されているため、ガスが開口部から外装体外部へ徐々に放出される。そして、初期充電によるガスの発生が終了した後、開口部を完全に封止することで電池が完成する。 According to the first configuration of the present invention, the exterior body is provided with a partial opening in the housing space of the exterior body to enclose the battery body, and the opening is sandwiched by a clip from outside the exterior body and temporarily closed. A certain level of hermeticity is ensured inside, and entry of water vapor from outside the exterior body can be prevented. Also, when gas is generated in the initial charge and the gas pressure inside the exterior body rises, the opening sandwiched between the clips is not completely sealed, but is closed by physical force The gas is gradually released from the opening to the exterior of the exterior body. And after generation | occurrence | production of the gas by initial charge is complete | finished, a battery is completed by sealing an opening part completely.
したがって、本発明に係る電池の製造方法においては、従来例で示したようなガスを貯める予備空間を外装体に形成する必要がないため、積層体フィルムの使用面積を抑えることができる。また、これによりプレスする積層体フィルムの全体の面積が小さくなり、安定してプレス成形することができる。 Therefore, in the method for manufacturing a battery according to the present invention, it is not necessary to form a spare space for storing gas as shown in the conventional example in the exterior body, so that the use area of the laminate film can be suppressed. Moreover, the area of the whole laminated body film to press becomes small by this, and it can press-mold stably.
本発明の第２の構成によると、上記電池の製造工程で用いるクリップが弾性体の反発力又は収縮力を利用して外装体外部を挟持するものであることにより、外装体内部の密封性が十分確保されるとともに内圧が上昇したとき、この内圧でクリップの押圧に抗して開口部が開く。また、ガスが外部に放出され外装体の内圧が低下した時、再び弾性体の反発力又は収縮力によりクリップの押圧が内圧を上回り、開口部が閉口され密封性が確保される。これにより、ガスの放出がより効率的に行なわれる。 According to the second configuration of the present invention, the clip used in the battery manufacturing process sandwiches the exterior of the exterior body by utilizing the repulsive force or contraction force of the elastic body, so that the sealability inside the exterior body is improved. When the internal pressure is sufficiently secured and the internal pressure rises, the opening opens against the pressing of the clip by the internal pressure. Further, when the gas is released to the outside and the internal pressure of the exterior body decreases, the pressing force of the clip again exceeds the internal pressure by the repulsive force or contraction force of the elastic body, and the opening is closed to ensure the sealing performance. As a result, the gas is released more efficiently.
本発明の第３の構成によると、クリップの係止部分に樹脂層を設けることにより被挟持物である外装体外部を安定的に挟持することができ、開口部の閉口効果も向上する。 According to the third configuration of the present invention, by providing the resin layer in the clip engaging portion, the exterior of the exterior body that is the object to be clamped can be stably held, and the closing effect of the opening is improved.
以下、本方法の実施形態を図面を参照して説明する。図１は電池の製造方法における一般的な製造工程を模式的に示す図である。まず、フィルムカットした積層体５をプレス成形し、電池本体の収納空間５ａを確保する（図１（ａ）参照）。次に、積層体５を半折りにし収納空間５ａに収納した電池本体２を閉蓋する（図１（ｂ）参照）。次に折り返した積層体５の２辺をシールし（図１（ｃ））、袋状になった積層体の開口部５ｃから電解質を注入する（図２（ａ）参照）。 Hereinafter, embodiments of the present method will be described with reference to the drawings. FIG. 1 is a diagram schematically showing a general manufacturing process in a battery manufacturing method. First, the film-cut laminate 5 is press-molded to secure a storage space 5a for the battery body (see FIG. 1 (a)). Next, the laminated body 5 is folded in half, and the battery body 2 stored in the storage space 5a is closed (see FIG. 1B). Next, two sides of the folded laminate 5 are sealed (FIG. 1C), and an electrolyte is injected from the opening 5c of the bag-like laminate (see FIG. 2A).
次に、開口部５ｃをクリップ６を用い一定圧力で挟持し、開口部５ｃを仮閉口した後、初期充電を行う（図２（ｂ）参照）。初期充電は約４分間行い、その後、ガスの発生が収まるまで一定温度下で一定時間静置する。このとき、開口部５ｃはクリップ６で挟持し物理的に閉口しただけで、密封シールされていないため、積層体内部でガスが発生し、外装体の内圧が上昇したときクリップ６の押圧に抗し開口部からガスが放出される。これにより、外装体内部のガス圧が急激に上昇することなく、初期充電で発生したガスを効率よく排出することができる。 Next, the opening 5c is clamped at a constant pressure using the clip 6, and after the opening 5c is temporarily closed, initial charging is performed (see FIG. 2B). The initial charging is performed for about 4 minutes, and then left to stand at a constant temperature for a certain period of time until gas generation ceases. At this time, since the opening 5c is sandwiched between the clips 6 and physically closed, and is not hermetically sealed, gas is generated inside the laminated body, and when the internal pressure of the exterior body rises, the clip 5 resists pressing. Gas is released from the opening. Thereby, the gas generated by the initial charging can be efficiently discharged without the gas pressure inside the exterior body rising rapidly.
次に、初期充電が終わった後、開口部５ｃをヒートシールし外装体内部を密封した後、クリップ６で挟持していた部分近傍をカットし（図２（ｃ）参照）、リチウムイオン電池１が完成する。 Next, after the initial charging is completed, the opening 5c is heat sealed to seal the inside of the exterior body, and then the vicinity of the portion sandwiched by the clip 6 is cut (see FIG. 2 (c)), and the lithium ion battery 1 Is completed.
次に各電池製造工程についてより詳細に説明する。外装体の収納空間５ａに一部開口部を設けて電池本体を封入する第１工程は、フィルムカットした積層体５をプレス成形するプレス工程、積層体５に電池本体２を収納する収納工程、電池本体２を収納した収納部周縁部５ｂを一部開口部５ｃを残しヒートシールするシール工程、電解質を開口部ｃより注入する電解質注入工程に分けることができる。なお、これらの工程はそれぞれ、図１の（ａ）〜（ｃ）及び図２（ａ）に相当する。 Next, each battery manufacturing process will be described in more detail. The first step of providing a part of the opening in the housing space 5a of the exterior body and enclosing the battery main body is a pressing step of press-molding the film-cut laminated body 5, a housing step of housing the battery main body 2 in the laminated body 5, The storage portion peripheral edge portion 5b in which the battery body 2 is stored can be divided into a sealing process in which a part of the opening 5c is left and heat sealed, and an electrolyte injection process in which an electrolyte is injected from the opening c. These steps correspond to (a) to (c) of FIG. 1 and FIG. 2 (a), respectively.
プレス工程は、エンボスタイプの外装体を使用する場合に行なわれる。図３はエンボスタイプのプレス成形に用いるオス型７、メス型８のプレス機の構造を示すものである。図３（ａ）はプレス前の積層体５の斜視図、図３（ｂ）、（ｃ）はプレス後、トレイ状に成形された積層体５の斜視図である。ここで、積層体は少なくとも金属層、熱接着性樹脂層、ナイロン等の基材層が接着剤等を用いて積層されており、プレス時、電池本体の収納部５ａは収納部周縁５ｂの積層体を引き込みながら形成される。 The pressing step is performed when an embossed type exterior body is used. FIG. 3 shows the structure of a male type 7 and female type 8 press machine used for emboss type press molding. 3A is a perspective view of the laminated body 5 before pressing, and FIGS. 3B and 3C are perspective views of the laminated body 5 formed into a tray shape after pressing. Here, at least a metal layer, a heat-adhesive resin layer, and a base material layer such as nylon are laminated using an adhesive or the like in the laminated body. It is formed while drawing the body.
例えば、図３（ｂ）に示すように収納部５ａを積層体５の中央部付近に設けることで、プレス時、収納部周縁５ｂが均等に引き込まれ、皺等が発生し難い。一方、図３（ｃ）に示すように、収納部５ａが積層体５の中央部付近に設けられていない場合、プレス時、収納部周縁５ｂを均等に引き込めず、皺や歪みが発生する場合がある。 For example, as shown in FIG. 3B, by providing the storage portion 5a in the vicinity of the central portion of the laminate 5, the storage portion peripheral edge 5b is evenly drawn during pressing, so that wrinkles and the like are unlikely to occur. On the other hand, as shown in FIG. 3C, when the storage portion 5a is not provided near the center of the laminate 5, the storage portion peripheral edge 5b cannot be evenly drawn during pressing, and wrinkles and distortion occur. There is a case.
ここで、本発明に係る電池の製造方法においては、従来例で示したような予備空間を設ける必要がないため、余分な部分をカットし必要最小限の積層体５をプレス成形することができるため安定したプレス成形性を得ることができる。なお、図１で示した積層体５は１枚の積層体５を折り返し、電池本体２を収納するタイプの外装体であるが、図３で示した積層体５はプレス成型によりトレイ状に成形した積層体に電池本体２を収納し、上からシート状の別の積層体５を被せるタイプの外装体である。しかし、いずれのタイプの外装体においても、本発明に係る製造工程で使用する積層体５は従来例で示した予備空間を設けた積層体５より使用面積が少なく成形性に優れる。 Here, in the battery manufacturing method according to the present invention, since it is not necessary to provide a spare space as shown in the conventional example, an excess portion can be cut and the minimum required laminate 5 can be press-molded. Therefore, stable press formability can be obtained. The laminated body 5 shown in FIG. 1 is a type of exterior body that folds one laminated body 5 and houses the battery body 2, but the laminated body 5 shown in FIG. 3 is formed into a tray shape by press molding. The battery body 2 is housed in the laminated body and the sheet-like laminated body 5 is covered from above. However, in any type of exterior body, the laminate 5 used in the manufacturing process according to the present invention has a smaller use area and excellent formability than the laminate 5 provided with the spare space shown in the conventional example.
また、本発明に係る電池の製造方法においては、パウチタイプの外装体を用いることも可能である。パウチタイプの外装体は図４に示すように袋状に形成された積層体５に電池本体２を収納するだけで、プレス成形する必要はない。 In the battery manufacturing method according to the present invention, a pouch-type exterior body can be used. As shown in FIG. 4, the pouch-type exterior body simply stores the battery body 2 in the laminated body 5 formed in a bag shape, and does not need to be press-molded.
次に電池本体２の収納工程について説明する。上記いずれのタイプの外装体においても、電池本体２を外装体に収納しシールする際、電池本体２の正極及び負極の各々に接続された金属端子４を外部に突出させるとともに積層体５で金属端子４を挟持した状態で熱接着することにより密封する必要がある。このために、積層体５の内層を金属と良好な接着性を有する熱接着性樹脂、例えば、不飽和カルボン酸でグラフト変性した酸変性オレフィン樹脂を用いて熱接着して密封する、あるいは、前記内層を金属との接着性に劣る一般的なオレフィン系樹脂を用い、金属と良好な接着性を有する上記した酸変性オレフィン樹脂からなる金属端子部密封用接着性フィルムを金属端子４と内層との間に介在させて熱接着して密封する方法が一般的にとられている。 Next, the storing process of the battery body 2 will be described. In any type of exterior body, when the battery body 2 is housed and sealed in the exterior body, the metal terminal 4 connected to each of the positive electrode and the negative electrode of the battery body 2 is projected to the outside and the laminate 5 is made of metal. It is necessary to seal by thermal bonding in a state where the terminal 4 is sandwiched. For this purpose, the inner layer of the laminate 5 is heat-adhered and sealed with a heat-adhesive resin having good adhesion to the metal, for example, an acid-modified olefin resin graft-modified with an unsaturated carboxylic acid, or The inner layer is made of a general olefin resin having poor adhesion to the metal, and the metal terminal portion sealing adhesive film made of the acid-modified olefin resin having good adhesion to the metal is formed between the metal terminal 4 and the inner layer. In general, a method of sealing by thermal bonding with intervening them is generally used.
次に収納部周縁５ｂをシールするシール工程について説明する。本工程においては、折り返しタイプの外装体を用いた場合、２辺をシールすることにより、１辺に開口部５ｃを有する外装体が得られ（図１（ｃ）参照）、トレイ状とシート状の積層体フィルムを用いるタイプの外装体を用いた場合、３辺をシールすることで１辺に開口部５ｃを設けることができる。また、パウチタイプの外装体を用いた場合、電池本体２を収納する開口部５ｃが一つあるのみであるため、金属端子４近傍をシールし、一部に開口部を設ければよい。したがって、開口部５ｃは１辺全体に設ける必要はなく、図５に示すように電解質の注入口及びガスの放出口として必要最小限の大きさがあればよい。 Next, a sealing process for sealing the storage portion peripheral edge 5b will be described. In this step, when a folded-type exterior body is used, an exterior body having an opening 5c on one side is obtained by sealing two sides (see FIG. 1C), a tray shape and a sheet shape. When the exterior body of the type using the laminated film is used, the opening 5c can be provided on one side by sealing three sides. Further, when a pouch-type exterior body is used, since there is only one opening 5c for storing the battery body 2, the vicinity of the metal terminal 4 may be sealed and an opening may be provided in part. Therefore, the opening 5c does not have to be provided on the entire side, and it is sufficient that the opening 5c has a minimum size as an electrolyte inlet and a gas outlet as shown in FIG.
次に、電解質注入工程について説明する。リチウムイオン電池１に用いる電解質としてはＬｉＣｏＯ2、ＬｉＮｉＯ2、ＬｉＭｎ2Ｏ4、及びこれらの複合体からなるリチウム含有複合酸化物を開口部から注入する。また、リチウムイオン電池以外の電池にも本製造方法を用いることができるため、電解質もその都度調製する必要がある。また、電解質は必ずしも液体である必要はなく、開口部５ｃからの噴出しを防止するため、ゲル状のものを用いてもよい。 Next, the electrolyte injection process will be described. As an electrolyte used for the lithium ion battery 1, LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , and a lithium-containing composite oxide made of a composite thereof are injected from the opening. Moreover, since this manufacturing method can be used also for batteries other than a lithium ion battery, it is necessary to prepare electrolyte each time. Further, the electrolyte is not necessarily a liquid, and a gel-like one may be used in order to prevent ejection from the opening 5c.
次に開口部５ｃを仮閉口する第２工程について説明する。なお、この工程は図２（ｂ）で示した工程に相当する。図６は電池本体２を収納した外装体の断面図であり、クリップ６を用いて開口部５ｃを挟持する方法を具体的に示している。クリップ６はバネ６ｂの反発力を利用して所定の挟持圧で開口部５ｃを仮閉口している。電解質を注入した後、開口部５ｃ近傍をクリップ６で挟持して仮閉口することで、外装体内部の密封性を確保し、外装体外部から水蒸気の浸入を防ぐことができる。また、初期充電においてガスが外装体内部に貯まり内圧が上昇すると、内圧により開口部の押圧に抗して開口部５ｃが開く。このときガスが外部に放出され、外装体内部の内圧は低下する。これにより、バネ６ｂの反発力により再びクリップの押圧が内圧を上回り開口部５ｃを挟持して閉口し、外装体内部の密封性が確保される。なお、外装体内部の密封性を高めるため、クリップ６の挟持圧を高くし過ぎると外装体内部のガスが放出されず、内圧が上昇し過ぎ外装体が破裂する可能性があるので適当な押圧を調整する必要がある。 Next, the second step of temporarily closing the opening 5c will be described. This step corresponds to the step shown in FIG. FIG. 6 is a cross-sectional view of the exterior body that houses the battery body 2, and specifically shows a method of holding the opening 5 c using the clip 6. The clip 6 temporarily closes the opening 5c with a predetermined clamping pressure using the repulsive force of the spring 6b. After injecting the electrolyte, by sandwiching the vicinity of the opening 5c with the clip 6 and temporarily closing it, it is possible to secure the sealing performance inside the exterior body and to prevent the entry of water vapor from the outside of the exterior body. Moreover, when gas accumulates in the exterior body and the internal pressure rises in the initial charge, the opening 5c opens against the pressing of the opening due to the internal pressure. At this time, gas is released to the outside, and the internal pressure inside the exterior body decreases. As a result, the pressing force of the clip again exceeds the internal pressure by the repulsive force of the spring 6b, and the opening 5c is pinched and closed, and the sealing performance inside the exterior body is ensured. In addition, in order to improve the sealing performance inside the exterior body, if the clamping pressure of the clip 6 is too high, the gas inside the exterior body will not be released, and the internal pressure may rise too much and the exterior body may burst, so that an appropriate pressure is applied. Need to be adjusted.
なお、図６では弾性体にバネ６ｂの反発力を利用して外装体外部を挟持しているが、弾性体にはゴム、合成樹脂を含むものである。 In FIG. 6, the outside of the exterior body is sandwiched between the elastic bodies using the repulsive force of the spring 6b, but the elastic bodies include rubber and synthetic resin.
なお、クリップ６の挟持部に樹脂層６ａを設け外装体外部を挟持することにより、開口部５ｃをより安定的に閉口ことができる。また、初期充電の際、漏電する可能性があるため、クリップ６はプラスチック等の絶縁性材料で形成されることが望ましい。また、開口部５ｃ近傍を折り曲げてクリップで挟持して外装体内部の密封性が向上させてもよい。 In addition, the opening part 5c can be closed more stably by providing the resin layer 6a in the clamping part of the clip 6 and clamping the exterior body exterior. Further, since there is a possibility of electric leakage during initial charging, the clip 6 is preferably formed of an insulating material such as plastic. Further, the vicinity of the opening 5c may be bent and sandwiched between clips to improve the sealing performance inside the exterior body.
また、充放電工程は初期充電工程とエージング工程とからなり、初期充電工程で充電を行いガスを発生させた後、エージング工程で所定温度の保温庫に一定時間静置し、ガスの発生が完全に終わるのを待つ。このときのガスの放出過程は上記説明したとおりである。 The charge / discharge process consists of an initial charge process and an aging process. After charging and generating gas in the initial charge process, the gas is completely generated in the aging process by leaving it in a heat-retaining chamber at a predetermined temperature for a certain period of time. Wait for it to finish. The gas release process at this time is as described above.
また、開口部５ｃを封止する第４工程は図２（ｃ）で示した工程に相当するものである。この工程では、エージング工程後、クリップで開口部５ｃを仮閉口し外装体内部の密封性を確保した状態で、クリップ６と電池本体２の間の空間をヒートシールし、外装体内部を完全に密封状態する。その後、開口部近傍の余分な部分を切り取り電池が完成する。なお、図７に示すように、開口部５ｃ近傍に余裕シロ５ｄを設けることにより、クリップを外した後、電解質が外装体外部にこぼれるのを防ぐことができる。 Further, the fourth step of sealing the opening 5c corresponds to the step shown in FIG. In this step, after the aging step, the space between the clip 6 and the battery body 2 is heat-sealed in a state where the opening 5c is temporarily closed with the clip and the sealing inside the exterior body is secured, and the interior of the exterior body is completely removed. Sealed. Thereafter, excess portions near the opening are cut off to complete the battery. As shown in FIG. 7, by providing a margin 5d near the opening 5c, the electrolyte can be prevented from spilling outside the exterior body after the clip is removed.
以上各工程を経て、電池を製造することにより、積層体の使用面積を最小限に留め、効率よく初期充電時に発生するガスを外装体外部に放出することができる。なお、本発明は上述した各実施形態に限定されるものではなく、種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。例えば、開口部５ｃを複数設け、それに対応するクリップ６を用いる場合などである。また、上記説明では、リチウムイオン電池の製造方法について述べたが、リチウムイオン電池の製造方法に限定されるわけではなく、積層体により電池本体を封入してなる電池全般に本発明は係る。 By manufacturing the battery through the above steps, it is possible to minimize the use area of the laminate and efficiently release the gas generated during the initial charging to the outside of the exterior body. The present invention is not limited to the above-described embodiments, and various modifications are possible. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the present invention. Included in the technical scope. For example, this is the case where a plurality of openings 5c are provided and corresponding clips 6 are used. In the above description, the method for manufacturing a lithium ion battery has been described. However, the present invention is not limited to the method for manufacturing a lithium ion battery, and the present invention generally relates to a battery in which a battery body is sealed with a laminate.
この発明は、電池の製造方法に関する。 The present invention relates to a battery manufacturing method.
１ リチウムイオン電池
２ 電池本体
４ 電極
５ 積層体
５ａ 収納部
５ｂ 収納部周縁
５ｃ 開口部
５ｄ 余裕シロ
６ クリップ
６ａ 樹脂層
６ｂ バネ
７ オス型
８ メス型
DESCRIPTION OF SYMBOLS 1 Lithium ion battery 2 Battery main body 4 Electrode 5 Laminated body 5a Storage part 5b Storage part periphery 5c Opening part 5d Margin 6 Clip 6a Resin layer 6b Spring 7 Male type 8 Female type
Claims (3)
前記開口部を仮閉口する第２工程と、
前記電池本体の初期充電を行う第３工程と、
前記開口部を封止する第４工程とを備える電池の製造工程において、
前記第２工程は、前記開口部を前記外装体の外部からクリップで挟持して仮閉口することを特徴とする電池の製造方法。 A first step of enclosing the battery body by providing an opening in a part of the exterior body;
A second step of temporarily closing the opening;
A third step of performing initial charging of the battery body;
In the battery manufacturing process comprising the fourth step of sealing the opening,
In the second step, the opening is clamped from outside the exterior body with a clip and temporarily closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006286075A JP2008103240A (en) | 2006-10-20 | 2006-10-20 | Method of manufacturing battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006286075A JP2008103240A (en) | 2006-10-20 | 2006-10-20 | Method of manufacturing battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2008103240A true JP2008103240A (en) | 2008-05-01 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006286075A Pending JP2008103240A (en) | 2006-10-20 | 2006-10-20 | Method of manufacturing battery |
Country Status (1)
| Country | Link |
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| JP (1) | JP2008103240A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010225498A (en) * | 2009-03-25 | 2010-10-07 | Panasonic Corp | Organic electrolyte battery |
| JP2016122495A (en) * | 2014-12-24 | 2016-07-07 | 昭和電工パッケージング株式会社 | Battery manufacturing method |
| JP2017126422A (en) * | 2016-01-12 | 2017-07-20 | トヨタ自動車株式会社 | Method for manufacturing all-solid battery |
-
2006
- 2006-10-20 JP JP2006286075A patent/JP2008103240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010225498A (en) * | 2009-03-25 | 2010-10-07 | Panasonic Corp | Organic electrolyte battery |
| JP2016122495A (en) * | 2014-12-24 | 2016-07-07 | 昭和電工パッケージング株式会社 | Battery manufacturing method |
| JP2017126422A (en) * | 2016-01-12 | 2017-07-20 | トヨタ自動車株式会社 | Method for manufacturing all-solid battery |
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