JP2007311323A - Secondary battery which has fixed separator to battery case and raised stability - Google Patents
Secondary battery which has fixed separator to battery case and raised stability Download PDFInfo
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- JP2007311323A JP2007311323A JP2006169023A JP2006169023A JP2007311323A JP 2007311323 A JP2007311323 A JP 2007311323A JP 2006169023 A JP2006169023 A JP 2006169023A JP 2006169023 A JP2006169023 A JP 2006169023A JP 2007311323 A JP2007311323 A JP 2007311323A
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- 238000007789 sealing Methods 0.000 claims abstract description 70
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
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- 230000000996 additive effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 5
- 239000012790 adhesive layer Substances 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 239000003792 electrolyte Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 229910002804 graphite Inorganic materials 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229920005597 polymer membrane Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
-
- 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
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
Abstract
Description
本発明は、電池ケースにセパレータを固定して安定性を向上させた二次電池に関し、より詳しくは、正極と負極がその間にセパレータが介在された状態で積層されている電極組立体を電池ケースに内蔵した後、電池ケースを封止して製造される二次電池であり、前記セパレータの外周面の少なくとも一部を、電池ケースの封止部と共に固定し、電池の異常発熱の際にセパレータの収縮により短絡が引き起こされることを防止することを特徴とする二次電池、及びそのような二次電池からなる電池モジュールに関する。 The present invention relates to a secondary battery in which a separator is fixed to a battery case to improve stability, and more specifically, an electrode assembly in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween is provided in the battery case. The battery case is a secondary battery manufactured by sealing the battery case, and at least a part of the outer peripheral surface of the separator is fixed together with the sealing part of the battery case, so that the battery is heated when the battery is abnormally heated. The present invention relates to a secondary battery characterized in that a short circuit is prevented from being caused by contraction of the battery, and a battery module comprising such a secondary battery.
モバイル機器に対する技術開発と需要が増加するにつれて、エネルギー源としての二次電池の需要が急増しており、このような二次電池の中でも、高いエネルギー密度と放電電圧を有するリチウム二次電池についての多くの研究が行われており、また、商用化して広く用いられている。 As technology development and demand for mobile devices increase, the demand for secondary batteries as energy sources has increased rapidly. Among these secondary batteries, lithium secondary batteries with high energy density and discharge voltage A lot of research has been conducted, and it has been commercialized and widely used.
一般に、二次電池は、正極、負極、及び前記正極と負極との間に介在されるセパレータで構成された電極組立体を積層または巻取した状態で、金属缶またはラミネートシートの電池ケースに内蔵した後、電解液を注入しまたは含浸させることにより構成されている。 Generally, a secondary battery is built in a battery case of a metal can or a laminate sheet in a state where an electrode assembly composed of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is laminated or wound. Then, an electrolyte solution is injected or impregnated.
このような二次電池における主な研究課題の一つは、安全性を向上させることである。例えば、二次電池は、内部短絡、許容された電流及び電圧を超過した過充電状態、高温への露出、落下または外部衝撃による変形等、電池の不正常の作動状態により引き起こされる電池内部の高温及び高圧により、電池の爆発をもたらすこともあり得る。 One of the main research subjects in such a secondary battery is to improve safety. For example, a secondary battery has a high internal temperature caused by an abnormal operating condition of the battery, such as an internal short circuit, an overcharged condition that exceeds the allowed current and voltage, exposure to high temperature, deformation due to dropping or external impact. And high pressure can cause battery explosion.
安全性の問題の一つとして、電池が高温に露出したときに発生するセパレータの収縮または破損による内部短絡は、極めて深刻な実情であり、これに対する原因究明及び代案に対する研究が多く行われている。 As one of the safety problems, the internal short circuit due to the shrinkage or breakage of the separator that occurs when the battery is exposed to high temperature is a very serious situation, and many studies have been conducted on the cause investigation and alternatives for this. .
一般に、セパレータは、ポリエチレン、ポリプロピレン等の多孔性高分子膜が用いられており、これらは、安価であり、耐化学性に優れ、電池の作動に好適であるという利点を有しているが、高温の環境において収縮しやすい。 Generally, porous polymer membranes such as polyethylene and polypropylene are used for the separator, and these have the advantages of being inexpensive, excellent in chemical resistance, and suitable for battery operation. Easy to shrink in high temperature environment.
このような問題点を解決するために、一般に、セパレータと電極との間に接着層を塗布して付着する方法が多用されている。このような接着層としては、電極活物質の決着剤としても用いられるPVDFが主に使用されている。しかしながら、このような接着層は、それが塗布されない場合に比べて、イオンの移動性が低下し、低いレート特性を示すという短所があった。また、接着層の塗布作業そのものが、別途の工程で加えられなければならないため、作業工数の増加による多くの問題点を引き起こすこともある。 In order to solve such problems, generally, a method of applying an adhesive layer between a separator and an electrode and attaching it is frequently used. As such an adhesive layer, PVDF which is also used as an electrode active material fixing agent is mainly used. However, such an adhesive layer has the disadvantages that ion mobility is lowered and low rate characteristics are exhibited as compared with the case where it is not applied. In addition, since the adhesive layer coating operation itself must be added in a separate process, it may cause many problems due to an increase in the number of work steps.
一方、パウチ状二次電池では、電池ケースの封止力が低下し、電解液が漏れるという問題点も頻繁に発生する。図1は、従来の代表的なパウチ状二次電池の一般構造を模式的に示す分解斜視図である。 On the other hand, in the pouch-shaped secondary battery, the problem that the sealing force of the battery case is reduced and the electrolyte solution leaks frequently occurs. FIG. 1 is an exploded perspective view schematically showing a general structure of a conventional typical pouch-shaped secondary battery.
図1を参照すると、パウチ状二次電池10は、電極組立体30と、電極組立体30から延長する電極タブ40、50と、電極タブ40、50に溶接されている電極リード60、70と、電極組立体30を収容する電池ケース20と、で構成されている。
Referring to FIG. 1, the pouch-shaped
電極組立体30は、セパレータが介在された状態で、正極と負極が順次積層されている発電素子であり、積重型または積重/折畳型構造からなっている。電極タブ40、50は、電極組立体30の各極板から延長され、電極リード60、70は、各極板から延長された複数個の電極タブ40、50と、例えば、溶接によりそれぞれ電気的に連結されており、電池ケース20の外部に一部が露出している。また、電極リード60、70の上下面の一部には、電池ケース20との封止性を高めるとともに、電気的絶縁状態を確保するために、絶縁膜80が付着されている。
The
電池ケース20は、アルミニウムラミネートシートからなり、電極組立体30を収容可能な空間を形成し、全体的にパウチ状となっている。
The
二次電池10は、電池ケース20の収納部に電極組立体30を取り付けた状態で、電池ケース20の外周面の接触部分を相互熱融着させて作製されるが、このような熱融着部分は、電池の継続的な使用による反復的な収縮・膨張、外部衝撃等により封止力が弱くなり、外部物質の流入、電解液の漏れ等により、電池の性能及び安全性の低下が引き起こされる部分である。
The
したがって、これを解決するための多くの技術が提案されているが、電池の製造費用を上昇させ、または組立工程を複雑となる問題点があった。 Therefore, many techniques for solving this problem have been proposed, but there are problems that increase the manufacturing cost of the battery or complicate the assembly process.
このため、電池の組立工程中、構造的な側面においてセパレータの収縮を抑制し、電池ケースの封止力の低下を防止することができる技術に対する必要性が高くなっている。 For this reason, during the battery assembly process, there is an increasing need for a technique capable of suppressing the shrinkage of the separator on the structural side and preventing the decrease in the sealing force of the battery case.
本発明は、上述の問題点に鑑みてなされたもので、その目的は、組立工程において、別途の添加物及び追加工程無しに、構造的変化のみで安全性を向上させることができる二次電池を提供することにある。具体的に、本発明の目的は、高温でセパレータの収縮現象を抑制して内部短絡を防止し、電池ケースの封止部を減少させて封止力を向上させることができる二次電池を提供することにある。 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a secondary battery that can improve safety only by structural changes without additional additives and additional steps in the assembly process. Is to provide. Specifically, an object of the present invention is to provide a secondary battery that can prevent the internal short circuit by suppressing the shrinkage phenomenon of the separator at a high temperature, and can reduce the sealing part of the battery case to improve the sealing power. There is to do.
また、本発明の他の目的は、このような二次電池を単位電池として含む電池モジュールを提供することにある。 Another object of the present invention is to provide a battery module including such a secondary battery as a unit battery.
上記目的を達成すべく、本発明に係る二次電池によれば、正極と負極がその間にセパレータが介在された状態で積層されている電極組立体を電池ケースに内蔵した後、電池ケースを封止して製造される二次電池であって、前記電池ケースは、電極組立体を収容可能な凹状の収納部を有する下部ケースと、該下部ケースの蓋として前記収納部を封止する上部ケースとが、一側において相互連結されて一体となる構造からなり、前記電極組立体は、その電極方向が前記ケースの連結部に隣接した一側面方向aに突出して収納部に取り付けられ、前記セパレータの外周面のうち、他側面方向b及び前記連結部の対向面方向cに対応するセパレータの外周面は、剰余部として、電池ケースの封止部に一緒に固定されることを特徴とする。 In order to achieve the above object, according to the secondary battery of the present invention, the battery case is sealed after the electrode assembly in which the positive electrode and the negative electrode are stacked with the separator interposed therebetween is built in the battery case. A secondary battery manufactured in a stopped state, wherein the battery case includes a lower case having a concave storage portion that can store an electrode assembly, and an upper case that seals the storage portion as a lid of the lower case And the electrode assembly is attached to the storage portion so that the electrode direction protrudes in one side surface direction a adjacent to the connection portion of the case, and is attached to the storage portion. Among the outer peripheral surfaces, the outer peripheral surface of the separator corresponding to the other side surface direction b and the facing surface direction c of the connecting portion is fixed together as a surplus portion to the sealing portion of the battery case.
これにより、本発明は、前記セパレータ剰余部を電池ケースの封止部に固定することにより、セパレータの収縮を抑制し、セパレータを中心に対面している正極と負極が接触して短絡することを防止することができる。すなわち、電池の組立工程中、別途の添加物及び追加工程無しに、構造的な側面における一部変更のみで電池の安全性を向上させることができる。 Thereby, this invention suppresses shrinkage | contraction of a separator by fixing the said separator surplus part to the sealing part of a battery case, and the positive electrode and negative electrode which are facing centering on a separator contact and short-circuit. Can be prevented. That is, during the battery assembly process, the safety of the battery can be improved by only a partial change in the structural aspect without additional additives and additional processes.
好ましくは、前記方向aの電池ケースの長さを方向cの電池ケースの長さよりも短くすることにより、電池全体の封止性をさらに高めることができる。すなわち、電池ケースの封止部を減少させ、封止性を向上させることができるという効果がある。 Preferably, by making the length of the battery case in the direction a shorter than the length of the battery case in the direction c, the sealing performance of the entire battery can be further improved. That is, there is an effect that the sealing part of the battery case can be reduced and the sealing performance can be improved.
本発明による前記電極組立体は、複数の電極タブを連結して正極と負極を構成する構造であれば、特に制限されず、例えば、所定の大きさを有する複数個の電極を順次積層した積重型電極組立体に好適に適用され得る。 The electrode assembly according to the present invention is not particularly limited as long as it has a structure in which a plurality of electrode tabs are connected to form a positive electrode and a negative electrode. For example, a product in which a plurality of electrodes having a predetermined size are sequentially stacked. It can be suitably applied to a heavy electrode assembly.
前記積重型電極組立体は、電極が積層される構造によって、フルセルまたはバイセルに分けられる。ここで、前記フルセルは、正極/セパレータ/負極、または正極/セパレータ/負極/セパレータ/正極/セパレータ/負極のように、両端部の電極が、それぞれ正極と負極を形成するように積層された電極組立体を意味し、前記バイセルは、両端部の電極が同一の電極を形成するように積層された電極組立体であって、正極/セパレータ/負極/セパレータ/正極からなる正極型バイセルと、負極/セパレータ/正極/セパレータ/負極からなる負極型バイセルとに分けられる。 The stacked electrode assembly is divided into a full cell or a bicell according to a structure in which electrodes are stacked. Here, the full cell is a positive electrode / separator / negative electrode or a positive electrode / separator / negative electrode / separator / positive electrode / separator / negative electrode in which electrodes at both ends are laminated so as to form a positive electrode and a negative electrode, respectively. The bicelle is an electrode assembly in which the electrodes at both ends are laminated so as to form the same electrode, the positive type bicell consisting of positive electrode / separator / negative electrode / separator / positive electrode, and negative electrode / Negative electrode type bicelle consisting of / separator / positive electrode / separator / negative electrode.
フルセルは、それ自体が一つの電極組立体を構成することができ、場合によっては、電極組立体の一部または全体の分離膜を、前述した電池ケースの封止部に一緒に固定可能に、大きめのサイズに作製してもよい。 The full cell itself can constitute one electrode assembly, and in some cases, a part or the whole separation membrane of the electrode assembly can be fixed together to the sealing part of the battery case described above, You may produce in a larger size.
バイセルの場合、正極型バイセルと負極型バイセルを交互に配列して、一つの電極組立体を構成することができる。ここで、バイセル間に介在されるセパレータおよび/またはバイセルそのものを構成するセパレータを、前述したように、大きめに作製して本発明による電気を構成してもよい。 In the case of a bicelle, a positive electrode type bicelle and a negative electrode type bicelle can be arranged alternately to form one electrode assembly. Here, as described above, the separator interposed between the bicells and / or the separator constituting the bicell itself may be made larger to constitute electricity according to the present invention.
本発明による電池は、特に、金属層と樹脂層を含むラミネートシート、具体的にはアルミニウムラミネートシートのパウチ状ケースに電極組立体が内蔵されているパウチ状電池に好適に適用され得る。 In particular, the battery according to the present invention can be suitably applied to a pouch-shaped battery in which an electrode assembly is built in a pouch-shaped case made of a laminate sheet including a metal layer and a resin layer, specifically, an aluminum laminate sheet.
前記パウチ状ケースは、電極組立体を内蔵した状態で、例えば、熱溶着により封止され、その熱融着封止部に、前記セパレータ剰余部を一緒に熱融着して固定することができる。具体的に、前記パウチ状ケースが、前述したように、上部ケースと下部ケースからなる場合、前記セパレータ剰余部は、前記上部ケースと下部ケースの接触部の間に介在された状態でケースの封止部と一緒に熱融着される。 The pouch-like case is sealed by, for example, heat welding with the electrode assembly built therein, and the separator surplus portion can be heat-sealed together and fixed to the heat-sealed sealing portion. . Specifically, when the pouch-shaped case is composed of an upper case and a lower case as described above, the separator surplus portion is sealed between the upper case and the lower case in a state of being interposed between the contact portions. It is heat-sealed together with the stop.
この際、前記セパレータ剰余部が熱融着される部分は、前記ケースの封止部の幅に対して30〜70%の大きさを有することが好ましい。これは、前記セパレータ剰余部により、電池ケースの封止力が低下することを防止するためである。すなわち、前記セパレータ剰余部が位置する封止部では、前記電池ケースが接する封止部においてよりも相対的に相互結合力が低いので、電池ケースの封止性が低下するしかない。したがって、前記電池ケースの封止部の幅を現在用いている電池ケースの封止部の幅よりも大きくし、または前記封止部において、セパレータ剰余部が位置する部分を限定することにより、電池ケースの封止性の低下を補償した。 At this time, the portion where the separator surplus portion is heat-sealed preferably has a size of 30 to 70% with respect to the width of the sealing portion of the case. This is to prevent the sealing force of the battery case from being reduced by the separator surplus portion. That is, since the mutual coupling force is relatively lower in the sealing portion where the separator surplus portion is located than in the sealing portion in contact with the battery case, the sealing performance of the battery case is only reduced. Therefore, by making the width of the sealing portion of the battery case larger than the width of the sealing portion of the currently used battery case, or by limiting the portion where the separator surplus portion is located in the sealing portion, Compensation for deterioration of case sealing performance.
場合によっては、前記電池ケースの封止部に、電極組立体を構成する全てのセパレータの剰余部または一部のセパレータの剰余部が固定されてもよい。例えば、積重型電極組立体の場合、電極組立体を構成するセパレータは、全て分離されているので、それぞれのセパレータにおいて熱収縮現象が発生し得る。したがって、この場合、全てのセパレータの剰余部が前記電池ケースの封止部に固定されることが好ましい。 In some cases, the surplus portions of all separators or the surplus portions of some separators constituting the electrode assembly may be fixed to the sealing portion of the battery case. For example, in the case of a stacked electrode assembly, since all the separators constituting the electrode assembly are separated, a heat shrink phenomenon may occur in each separator. Therefore, in this case, it is preferable that the surplus portions of all the separators are fixed to the sealing portion of the battery case.
好ましい一例において、前記セパレータ剰余部が、接着剤により電池ケースの封止予定部分に予め固定された後、電池ケースの封止の際に一緒に固定されてもよい。これは、電池ケースに対するセパレータ剰余部の結合力を高めて、電池ケースの封止性を高めるためである。 In a preferred example, the separator surplus part may be fixed together at the time of sealing the battery case after being fixed in advance to the part to be sealed of the battery case by an adhesive. This is for enhancing the bonding strength of the separator surplus portion with respect to the battery case and improving the sealing performance of the battery case.
好ましい他の例において、前記セパレータ剰余部が、熱融着により予め相互結合した状態で、電池ケースの封止予定部分に固定された後、電池ケースの封止の際に一緒に固定されてもよい。 In another preferable example, the separator surplus portion may be fixed together at the time of sealing the battery case after being fixed to the sealing portion of the battery case in a state where they are pre-bonded by heat fusion. Good.
前述した二つの構造において、前記セパレータ剰余部を予め結合し、または固定することにより、電池ケースの封止部に定位置させることができ、セパレータ剰余部がそれぞれ分離されて別々に動くことを防止することができる。場合によっては、前記両構造は、セパレータ剰余部の固定及び電池ケースの封止作業を容易に行うことができ、一つの二次電池において一緒に適用されてもよい。 In the two structures described above, the separator surplus portion can be fixedly fixed to the sealing portion of the battery case by pre-bonding or fixing, and the separator surplus portion can be separated and prevented from moving separately. can do. In some cases, both the structures can easily fix the separator surplus portion and seal the battery case, and may be applied together in one secondary battery.
本発明はまた、前記二次電池を単位電池として含む中大型電池モジュールに関する。 The present invention also relates to a medium-to-large battery module including the secondary battery as a unit battery.
本発明によれば、高い安全性と、優れた封止性を有する二次電池を単位電池として用いることにより、多数の二次電池からなる中大型電池モジュールにおいて、特に問題となる優れた安全性と長寿命の要求を同時に解決することができる。 According to the present invention, by using a secondary battery having high safety and excellent sealing properties as a unit battery, excellent safety which is particularly problematic in a medium-to-large battery module composed of a large number of secondary batteries. And long-life requirements can be solved at the same time.
本発明によれば、高温でセパレータの収縮現象を抑制して内部短絡を防止し、電池ケースの封止部を減少させて封止力を向上させることができるという効果がある。 According to the present invention, there is an effect that the shrinkage phenomenon of the separator can be suppressed at a high temperature to prevent an internal short circuit, and the sealing portion of the battery case can be reduced to improve the sealing force.
以下、本発明の好ましい実施の形態を、添付図面に基づき詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
図2は、本発明の一実施の形態に係る二次電池を示す分解斜視図である。本発明における前記一側面方向a、他側面方向b、及び対向面方向cは、図2から容易に確認することができる。 FIG. 2 is an exploded perspective view showing a secondary battery according to an embodiment of the present invention. The one side surface direction a, the other side surface direction b, and the opposing surface direction c in the present invention can be easily confirmed from FIG.
図2を参照すると、二次電池100は、正極210と、負極220と、これらよりも大きめのサイズのセパレータ230とが順次積層されている電極組立体200と、電極組立体200が収納可能な凹状の収納部340が形成されている下部ケース310と、蓋として収納部340を封止する上部ケース320とが、一側において相互連結されている構造の電池ケース300と、で構成されている。したがって、電極組立体200を下部ケース310の収納部340に取り付け、上部ケース320を覆った後、下部ケース310と上部ケース320が接する封止部360、361、362を熱融着して封止することにより、二次電池を作製することができる。
Referring to FIG. 2, the
電極組立体200は、一側面から正極タブ211と負極タブ221がそれぞれ突出している正極210と負極220、及びこれらの間に介在されているセパレータ230からなっている。したがって、電極組立体200は、全体の形状面において、その4側面からセパレータ230が所定の長さだけ突出したセパレータ剰余部231を有している。
The
このような電極組立体200は、その正極タブ211と負極タブ221が上部ケース320と下部ケース310の連結部330に隣接した両側面350、351の一つである、一側面350の方向aに突出するように、下部ケース310の収納部340に取り付けられる。この際、電極組立体200のセパレータ剰余部231は、一側面350に対向する他側面351の方向b、及びケース310、320の連結部330に対向する側面352の方向cにそれぞれ突出し、他側面封止部361と対向面封止部362において、電池ケース300と一緒に熱融着されて固定される。
In such an
二次電池100を作製するにあたって、電池ケース300の封止性は、封止部360、361、362の長さと反比例関係にあるので、全体の電池において、封止部360、361、362が占めるサイズが大きいほど、電池ケース300の封止性が低下する。すなわち、一体化している上部ケース320と下部ケース310の連結部330は、熱融着による封止部360、361、362よりも封止力に優れているので、より多くの部分において、ケース300が折曲形成される連結部330が形成されると、さらに優れた封止性を得ることができる。
In producing the
これと関連して、図1に示すような従来の二次電池10は、電極タブ40、50が突出する封止部の長さが、それに隣接した両側面の長さよりも短い。したがって、電池ケース20が折り曲げられる連結部の長さも短い。
In this connection, in the conventional
これに対して、本発明に係る二次電池は、図2に示すように、電極タブ211、221が連結部330に隣接した一側面の封止部360に形成されるので、従来の二次電池に比べて、相対的に大きなサイズに連結部330が得られ、そのサイズの増加分だけ、封止性の向上を期待することができる。
In contrast, in the secondary battery according to the present invention, as shown in FIG. 2, the
以下、実施例を通じて本発明をさらに詳述するが、下記実施例は、本発明を例示するためのものであり、本発明の範疇がこれらのみに限定されるものではない。 Hereinafter, the present invention will be described in more detail through examples. However, the following examples are intended to illustrate the present invention, and the scope of the present invention is not limited thereto.
[実施例1]
正極は、一般に知られた組成で、リチウムコバルト酸化物、PVDF及び導電材のスラリーをアルミニウム集電体上にコートして作製し、負極は、一般に知られた組成で、黒鉛、PVDF及び導電材のスラリーを銅集電体上にコートして作製した。
[Example 1]
The positive electrode has a generally known composition and is prepared by coating a slurry of lithium cobalt oxide, PVDF and a conductive material on an aluminum current collector. The negative electrode has a generally known composition and has graphite, PVDF and a conductive material. The slurry was coated on a copper current collector.
前記正極と負極との間にそれらよりも大きめのサイズに裁断されたセパレータを介在させて電極組立体を組み立て、図2に示すような幅に対して長さが長い電池ケースの内部に電極組立体を取り付けた後、電池ケースの封止部を電極組立体のセパレータ剰余部と一緒に熱融着して、二次電池を完成した。 An electrode assembly is assembled by interposing a separator cut to a larger size between the positive electrode and the negative electrode, and the electrode assembly is placed inside a battery case having a length longer than the width as shown in FIG. After attaching the solid, the sealing part of the battery case was heat-sealed together with the separator surplus part of the electrode assembly to complete the secondary battery.
[比較例1]
電極組立体のセパレータ剰余部を電池ケースの封止部に一緒に熱融着しないことを除いては、前記実施例1と同様にして、二次電池を完成した。
[Comparative Example 1]
A secondary battery was completed in the same manner as in Example 1 except that the separator surplus portion of the electrode assembly was not thermally fused together with the sealing portion of the battery case.
[比較例2]
図1に示すように、電極タブの突出方向の封止部の長さが、その側面封止部の長さよりも小さなサイズの電池ケースを用いたことを除いては、前記実施例1と同様にして、二次電池を完成した。
[Comparative Example 2]
As shown in FIG. 1, the length of the sealing part in the protruding direction of the electrode tab is the same as that of Example 1 except that a battery case having a size smaller than the length of the side sealing part is used. Thus, a secondary battery was completed.
[実験例1]
前記実施例1と比較例1及び2においてそれぞれ作製された20個の電池に対して、過充電と高温露出実験を行い、300サイクル充放電を行った後、電池ケースの封止部において電解液の漏れの有無を確認した。
[Experimental Example 1]
The 20 batteries prepared in Example 1 and Comparative Examples 1 and 2 were subjected to overcharge and high-temperature exposure experiments, and after 300 cycles of charge / discharge, the electrolyte solution was sealed in the battery case sealing part. The presence or absence of leakage was confirmed.
その結果、実施例1の全ての電池では、短絡が引き起こされず、電解液の漏れが認められなかった。これに対して、セパレータを封止部に固定しなかった比較例1の電池のうち、6個の電池において短絡が生じた。また、セパレータを封止部に固定したが、幅に対して長さが長い電池ケースを用いた比較例2の電池は、全ての電池において短絡が生じなかったが、そのうち2個の電池において電解液の漏れが確認された。 As a result, in all the batteries of Example 1, no short circuit was caused, and no electrolyte leakage was observed. On the other hand, among the batteries of Comparative Example 1 in which the separator was not fixed to the sealing portion, a short circuit occurred in six batteries. Moreover, although the separator was fixed to the sealing part, the battery of the comparative example 2 using the battery case having a long length with respect to the width did not cause a short circuit in all of the batteries. Liquid leakage was confirmed.
本発明の属する分野における通常の知識を有する者であれば、前記内容に基づいて、本発明の範疇内で様々な応用及び変形を行うことが可能であろう。 A person having ordinary knowledge in the field to which the present invention belongs will be able to make various applications and modifications within the scope of the present invention based on the above contents.
100 二次電池
200 電極組立体
210 正極
220 負極
230 セパレータ
231 セパレータ剰余部
211 正極タブ
221 負極タブ
300 電池ケース
310 下部ケース
320 上部ケース
330 連結部
340 収納部
350、351 両側面
352 側面
360、361、362 封止部
a 一側面方向、
b 他側面方向
c 対向面方向
DESCRIPTION OF
b Other side direction c Opposite side direction
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KR100894409B1 (en) | 2009-04-24 |
KR20070110572A (en) | 2007-11-20 |
JP4562693B2 (en) | 2010-10-13 |
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