JP5962653B2 - Winding type secondary battery - Google Patents
Winding type secondary battery Download PDFInfo
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- JP5962653B2 JP5962653B2 JP2013514027A JP2013514027A JP5962653B2 JP 5962653 B2 JP5962653 B2 JP 5962653B2 JP 2013514027 A JP2013514027 A JP 2013514027A JP 2013514027 A JP2013514027 A JP 2013514027A JP 5962653 B2 JP5962653 B2 JP 5962653B2
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/469—Separators, membranes or diaphragms characterised by their shape tubular or cylindrical
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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
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- General Chemical & Material Sciences (AREA)
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Description
本発明は、非水電解液二次電池等の捲回式二次電池に関するものである。 The present invention relates to a wound secondary battery such as a non-aqueous electrolyte secondary battery.
セパレータを間に介して積層された正極板及び負極板が軸芯に捲回されて構成された極板群を有する捲回式二次電池が知られている。このような捲回式二次電池では、軸芯を樹脂で形成している。しかしながら、軸芯を樹脂材料のみで形成すると、軸芯の熱伝導率が低くなり、極板群で発生した熱を軸芯を介して電池外部に放出し難くなる。また、軸芯を金属材料のみで形成することも考えられるが、捲回式二次電池に振動や衝撃が与えられた際に、正極板及び負極板の配置位置がずれて、両極板が軸芯を介して短絡するおそれがある。そこで、特開平１０−１１２３３０号公報（特許文献１）に示すように、軸芯を金属製の内芯部及び該内芯部の外側に設けられた絶縁材料からなる外芯部から構成することが提案された。 2. Description of the Related Art A wound secondary battery having an electrode plate group in which a positive electrode plate and a negative electrode plate stacked with a separator interposed therebetween are wound around an axis is known. In such a wound secondary battery, the shaft core is formed of resin. However, when the shaft core is formed of only a resin material, the thermal conductivity of the shaft core is lowered, and it is difficult to release the heat generated in the electrode plate group to the outside of the battery through the shaft core. In addition, it is conceivable that the shaft core is formed only of a metal material. However, when vibration or impact is applied to the wound type secondary battery, the arrangement positions of the positive electrode plate and the negative electrode plate are shifted, so that the bipolar plates are axially moved. There is a risk of short circuit through the core. Therefore, as shown in JP-A-10-112330 (Patent Document 1), the shaft core is composed of a metal inner core portion and an outer core portion made of an insulating material provided outside the inner core portion. Was proposed.
しかしながら、特許文献１に示された捲回式二次電池では、外芯部を構成する絶縁材料がＰＥ、ＰＰ等の樹脂であるため、熱伝導率が低く極板群で発生した熱を金属製の内芯部に十分に伝達することができなかった。また、外芯部を構成する絶縁材料として熱伝導性の高い絶縁材料を用いることも考えられるが、このような絶縁材料を用いると、外部の温度が下がった場合に、熱が金属製の内心部に積極的に伝達されて、電池内部の温度が下がり過ぎるおそれがある。 However, in the wound secondary battery disclosed in Patent Document 1, since the insulating material constituting the outer core portion is a resin such as PE or PP, the heat conductivity is low and the heat generated in the electrode plate group is metal It could not be sufficiently transmitted to the inner core part. In addition, it is conceivable to use an insulating material having high thermal conductivity as the insulating material constituting the outer core portion. However, when such an insulating material is used, when the external temperature falls, the heat is made of a metal core. There is a possibility that the temperature inside the battery is excessively lowered by being actively transmitted to the part.
本発明の目的は、高温時に極板群で発生した熱を電池外部に十分に放出することができ、しかも低温時における二次電池内部の温度の低下を抑制できる捲回式二次電池を提供することにある。 An object of the present invention is to provide a wound secondary battery that can sufficiently release the heat generated in the electrode plate group to the outside of the battery at a high temperature and can suppress a decrease in the temperature inside the secondary battery at a low temperature. There is to do.
本発明が改良の対象とする捲回式二次電池は、金属製の細長い内芯部及び該内芯部の外側に設けられた絶縁材料からなる外芯部からなる軸芯に、セパレータを間に介して積層された正極板及び負極板が捲回されて構成された極板群を有している。本発明では、外芯部を構成する絶縁材料が、１〜２０Ｗ／ｍｋの熱伝導率を有している。外芯部を構成する絶縁材料がこのような熱伝導率を有していると、高温時に極板群で発生した熱を金属製の内芯部に十分に伝達して、良好な放熱を得ることができる。しかも低温時においては、金属よりも熱伝達率が低い絶縁材料が存在するため、極板群からの内芯部への熱伝達を抑制して、電池の内部温度の低下を抑制することができる。なお、絶縁材料の熱伝導率が１Ｗ／ｍｋを下回ると、高温時に極板群で発生した熱を電池外部に十分に放出することができない。絶縁材料の熱伝導率が２０Ｗ／ｍｋを上回ると、低温時における温度低下を抑制し難くなる。 The wound type secondary battery to be improved by the present invention has a separator interposed between an elongated core made of metal and an outer core made of an insulating material provided outside the inner core. A positive electrode plate and a negative electrode plate stacked via the electrode plate group. In the present invention, the insulating material constituting the outer core portion has a thermal conductivity of 1 to 20 W / mk. When the insulating material constituting the outer core portion has such a thermal conductivity, heat generated in the electrode plate group at a high temperature is sufficiently transmitted to the metal inner core portion to obtain good heat dissipation. be able to. In addition, since there is an insulating material having a heat transfer coefficient lower than that of metal at low temperatures, heat transfer from the electrode plate group to the inner core portion can be suppressed, and a decrease in the internal temperature of the battery can be suppressed. . If the thermal conductivity of the insulating material is less than 1 W / mk, heat generated in the electrode plate group at a high temperature cannot be sufficiently released to the outside of the battery. When the thermal conductivity of the insulating material exceeds 20 W / mk, it is difficult to suppress a temperature drop at a low temperature.
絶縁材料は、絶縁樹脂材料に熱伝導率２０Ｗ／ｍｋ以上の無機充填剤を充填して形成することができる。このようにして絶縁材料を形成すれば、無機充填剤の充填量を調整することにより、所望の熱伝導率の絶縁材料を容易に得ることができる。 The insulating material can be formed by filling an insulating resin material with an inorganic filler having a thermal conductivity of 20 W / mk or more. When the insulating material is formed in this manner, an insulating material having a desired thermal conductivity can be easily obtained by adjusting the filling amount of the inorganic filler.
絶縁樹脂材料としては、エポキシ樹脂を用いることができる。この場合、無機充填剤としては、金属酸化物、金属窒化物、金属炭化物、金属水酸化物、セラミックスの粉末あるいは繊維、またはこれらの混合物を用いることができる。 An epoxy resin can be used as the insulating resin material. In this case, as the inorganic filler, metal oxide, metal nitride, metal carbide, metal hydroxide, ceramic powder or fiber, or a mixture thereof can be used.
１〜２０Ｗ／ｍｋの熱伝導率を有する絶縁材料を得るには、無機充填剤を絶縁樹脂材料１００体積部に対して１０〜１００体積部混合すればよい。 In order to obtain an insulating material having a thermal conductivity of 1 to 20 W / mk, the inorganic filler may be mixed in an amount of 10 to 100 parts by volume with respect to 100 parts by volume of the insulating resin material.
本発明の捲回式二次電池に用いる軸芯は、種々の形状の外芯部及び内芯部を備えた軸芯に適応することができる。例えば、外芯部及び内芯部が筒形状を有していてもよい。このような軸芯を用いれば、内芯部の重量を小さくでき、電池のエネルギー密度を高めることができる。また、内芯部の放熱面積を増大できるので放熱性能を高めることができる。 The shaft core used in the wound secondary battery of the present invention can be applied to a shaft core having an outer core portion and an inner core portion having various shapes. For example, the outer core part and the inner core part may have a cylindrical shape. If such an axial core is used, the weight of the inner core portion can be reduced, and the energy density of the battery can be increased. Moreover, since the heat radiation area of the inner core portion can be increased, the heat radiation performance can be enhanced.
また、外芯部が筒形状を有しており、内芯部が円柱形状を有していてもよい。このような軸芯を用いれば、内芯部が円柱形状を有しているため、内芯部の熱伝導性を高めることができる。 Moreover, the outer core part may have a cylindrical shape, and the inner core part may have a cylindrical shape. If such an axial core is used, since the inner core portion has a cylindrical shape, the thermal conductivity of the inner core portion can be increased.
また、外芯部及び内芯部が筒形状を有しており、外芯部が長手方向の中心から両端部に向かうに従って、断面積が小さくなる形状を有しており、内芯部が長手方向の中心から両端部に向かうに従って、断面積が大きくなる形状を有している軸芯を用いることができる。このような軸芯を用いれば、極板群の中心部の熱を積極的に外部に導出することが可能になり、電池の放熱特性を向上させることができる。 In addition, the outer core portion and the inner core portion have a cylindrical shape, and the outer core portion has a shape in which the cross-sectional area decreases as it goes from the center in the longitudinal direction to both end portions, and the inner core portion is elongated. An axial core having a shape in which the cross-sectional area increases from the center of the direction toward both ends can be used. By using such an axial core, it becomes possible to positively lead the heat at the center of the electrode plate group to the outside, and the heat dissipation characteristics of the battery can be improved.
以下、図面を参照して、リチウムイオン電池からなる非水電解液二次電池に適用した本発明の捲回式二次電池の実施の形態について説明する。図１は、本発明の一実施の形態の非水電解液二次電池の断面図である。図１に示すように、本実施の形態の非水電解液二次電池は、容器１と、容器１内に配置された極板群３と、極板群３の後述する軸芯２３に接合される正極端子５と負極端子７とを有している。容器１は、容器本体９と正極側電池蓋１１と負極側電池蓋１３とを有している。容器本体９は、ステンレスからなり、両端に開口部９ａ，９ｂを有する円筒形を有している。正極側電池蓋１１及び負極側電池蓋１３は、いずれも金属材料からなり、中央に孔１１ａ，１３ａをそれぞれ有する円板に近い形状を有している。本例では、正極側電池蓋１１は、電池内圧の上昇により開裂する開裂弁１１ｂを有している。負極側電池蓋１３は、電解液注入口１３ｂを有している。正極側電池蓋１１及び負極側電池蓋１３は、容器本体９の両端の開口部９ａ，９ｂにそれぞれ嵌合されている。 Hereinafter, with reference to the drawings, an embodiment of a wound secondary battery of the present invention applied to a non-aqueous electrolyte secondary battery made of a lithium ion battery will be described. FIG. 1 is a cross-sectional view of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. As shown in FIG. 1, the nonaqueous electrolyte secondary battery of the present embodiment is joined to a container 1, an electrode plate group 3 disposed in the container 1, and a shaft core 23 described later of the electrode plate group 3. The positive electrode terminal 5 and the negative electrode terminal 7 are provided. The container 1 has a container body 9, a positive electrode side battery cover 11, and a negative electrode side battery cover 13. The container body 9 is made of stainless steel and has a cylindrical shape having openings 9a and 9b at both ends. Each of the positive electrode side battery cover 11 and the negative electrode side battery cover 13 is made of a metal material, and has a shape close to a disk having holes 11a and 13a in the center. In this example, the positive electrode side battery lid 11 has a cleavage valve 11b that is cleaved when the battery internal pressure increases. The negative electrode side battery cover 13 has an electrolyte solution inlet 13b. The positive electrode side battery cover 11 and the negative electrode side battery cover 13 are fitted in openings 9 a and 9 b at both ends of the container body 9, respectively.
極板群３は、図２の分解斜視図に示すように、帯状の第１のセパレータ１５及び第２のセパレータ１７を間に介して積層された帯状の正極板１９及び負極板２１が軸芯２３に捲回されて構成されている。第１のセパレータ１５及び第２のセパレータ１７は、クラフト紙等の多孔質基材からなり、電解液が含浸されている。正極板１９は、例えばアルミニウム箔からなる正極集電体上に正極活物質層が塗布されて構成されている。正極板１９には、正極集電体と一体に成形されて極板群３の一方の端部側から突出する複数の正極リード片２７が接続されている。負極板２１は、例えば銅箔からなる負極集電体上に負極活物質層が塗布されて構成されている。負極板２１には、負極集電体と一体に成形されて極板群３の他方の端部側から突出する複数の負極リード片３３が接続されている。図１に示すように、正極リード片２７は、後述する正極端子５の鍔部５ｂに電気的に接続され、負極リード片３３は、負極端子７の鍔部７ｂに電気的に接続されている。 As shown in the exploded perspective view of FIG. 2, the electrode plate group 3 includes a belt-like positive electrode plate 19 and a negative electrode plate 21 stacked with a belt-like first separator 15 and a second separator 17 interposed therebetween. 23 is wound around. The first separator 15 and the second separator 17 are made of a porous substrate such as kraft paper and impregnated with an electrolytic solution. The positive electrode plate 19 is configured by applying a positive electrode active material layer on a positive electrode current collector made of, for example, an aluminum foil. Connected to the positive electrode plate 19 are a plurality of positive electrode lead pieces 27 that are formed integrally with the positive electrode current collector and project from one end side of the electrode plate group 3. The negative electrode plate 21 is configured by applying a negative electrode active material layer on a negative electrode current collector made of, for example, copper foil. Connected to the negative electrode plate 21 are a plurality of negative electrode lead pieces 33 that are formed integrally with the negative electrode current collector and project from the other end side of the electrode plate group 3. As shown in FIG. 1, the positive electrode lead piece 27 is electrically connected to the flange portion 5 b of the positive electrode terminal 5 described later, and the negative electrode lead piece 33 is electrically connected to the flange portion 7 b of the negative electrode terminal 7. .
図３に示すように、軸芯２３は、内芯部３７と内芯部３７の外側に一体に設けられた外芯部３９とを有している。内芯部３７は、熱伝導率の高い金属により形成されており、細長い円筒形を有している。内芯部３７を形成する金属としては、Ｆｅ、Ａｌ、Ｃｕ、Ｎｉ、Ａｇ等の単体の金属、または、ステンレス綱、クロムモリブデン綱、マンガンモリブデン綱、真鍮等の合金を用いることができる。 As shown in FIG. 3, the shaft core 23 includes an inner core portion 37 and an outer core portion 39 provided integrally on the outer side of the inner core portion 37. The inner core portion 37 is made of a metal having high thermal conductivity and has an elongated cylindrical shape. As the metal forming the inner core portion 37, a single metal such as Fe, Al, Cu, Ni, or Ag, or an alloy such as a stainless steel, a chromium molybdenum steel, a manganese molybdenum steel, or a brass can be used.
外芯部３９は、内芯部３７をインサートとして絶縁材料によりインサート成形されており、内芯部３７の外側を覆う細長い円筒形を有している。外芯部３９を形成する絶縁材料は、絶縁樹脂材料に熱伝導率２０Ｗ／ｍｋ以上の無機充填剤が充填されて構成されており、１〜２０Ｗ／ｍｋの熱伝導率を有している。絶縁樹脂材料としては、下記式に示すようなエポキシ樹脂モノマを重合したエポキシ樹脂を用いることができる。
このようなエポキシ樹脂モノマは、ビフェニル骨格またはビフェニル誘導体の骨格を有し、１分子中に２以上のエポキシ基を有している。エポキシ樹脂モノマの硬化を進めるための硬化剤としては、アミン化合物またはその誘導体、酸無水物、イミダゾールまたはその誘導物、フェノール類またはその化合物や重合体を用いることができる。エポキシ樹脂モノマと硬化剤との反応を促進する硬化促進剤としては、トリフェニルホスフィン、イミダゾールまたはその誘導物、三級アミン化合物またはその誘導体を用いることができる。エポキシ樹脂には、必要に応じて難燃剤、希釈剤、可塑剤、カップリング剤等を添加することができる。 Such an epoxy resin monomer has a biphenyl skeleton or a skeleton of a biphenyl derivative, and has two or more epoxy groups in one molecule. As a curing agent for promoting the curing of the epoxy resin monomer, an amine compound or a derivative thereof, an acid anhydride, an imidazole or a derivative thereof, a phenol or a compound or a polymer thereof can be used. As the curing accelerator for promoting the reaction between the epoxy resin monomer and the curing agent, triphenylphosphine, imidazole or its derivative, tertiary amine compound or its derivative can be used. A flame retardant, a diluent, a plasticizer, a coupling agent, etc. can be added to an epoxy resin as needed.
絶縁樹脂材料に充填する無機充填剤は、２０Ｗ／ｍｋ以上の熱導電率を有しており、金属酸化物、金属窒化物、金属炭化物、金属水酸化物、セラミックスの粉末あるいは繊維、またはこれらの混合物を用いることができる。金属酸化物としては、酸化亜鉛、酸化マグネシウム、アルミナ等を用いることができる。金属窒化物としては、窒化ホウ素、窒化アルミニウム、窒化ケイ素、窒化チタン等を用いることができる。金属炭化物としては、炭化ケイ素、炭化タングステン等を用いることができる。 The inorganic filler to be filled in the insulating resin material has a thermal conductivity of 20 W / mk or more, and is a metal oxide, metal nitride, metal carbide, metal hydroxide, ceramic powder or fiber, or these Mixtures can be used. As the metal oxide, zinc oxide, magnesium oxide, alumina, or the like can be used. As the metal nitride, boron nitride, aluminum nitride, silicon nitride, titanium nitride, or the like can be used. As the metal carbide, silicon carbide, tungsten carbide, or the like can be used.
無機充填剤は、絶縁樹脂材料１００体積部に対して１０〜１００体積部混合するのが好ましい。 The inorganic filler is preferably mixed in an amount of 10 to 100 parts by volume with respect to 100 parts by volume of the insulating resin material.
外芯部３９の内径寸法は、軸芯２３の長手方向において一定であり、内芯部３７の外径寸法は、軸芯２３の長手方向において一定である。外芯部３９の厚み寸法Ｌ１は、内芯部３７の外径寸法Ｌ２の１０〜３０％とするのが好ましい。１０％を下回ると、低温時における熱の放出を阻止し難くなる。３０％を上回ると、高温時に極板群で発生した熱を電池外部に十分に放出することができない。 The inner diameter dimension of the outer core portion 39 is constant in the longitudinal direction of the shaft core 23, and the outer diameter dimension of the inner core portion 37 is constant in the longitudinal direction of the shaft core 23. The thickness L1 of the outer core portion 39 is preferably 10 to 30% of the outer diameter L2 of the inner core portion 37. If it is less than 10%, it becomes difficult to prevent the release of heat at low temperatures. If it exceeds 30%, the heat generated in the electrode plate group at a high temperature cannot be sufficiently released to the outside of the battery.
図１に示すように、軸芯２３に接合される正極端子５は、アルミにより形成されており、円筒形の端子本体５ａと端子本体５ａの長手方向の中央部に一体に成形された鍔部５ｂとを有している。負極端子７も正極端子５と同様に、円筒形の端子本体７ａと端子本体７ａの長手方向の中央部に一体に成形された鍔部７ｂとを有している。正極端子５は、正極側電池蓋１１の孔１１ａにセラミックス製の絶縁部材４１を介して嵌合されている。負極端子７は、銅により形成されており、負極側電池蓋１３の孔１３ａにセラミックス製の絶縁部材４３を介して嵌合されている。正極端子５の正極側電池蓋１１から電池外部に突出した端部５ｃの外周には螺子が形成されている。この端部５ｃには、金属製のワッシャ４５が嵌合された状態でナット４７が螺合されている。負極端子７の負極側電池蓋１３から突出した端部７ｃにも外周には螺子が形成されている。端部７ｃには、金属製のワッシャ４９が嵌合された状態でナット５１が螺合されている。正極端子５の電池内部に突出した端部５ｄは、軸芯２３の円筒形の内芯部３７の一方の端部に嵌合されている。負極端子７の電池内部に突出した端部７ｄは、軸芯２３の円筒形の内芯部３７の他方の端部に嵌合されている。また、正極端子５と軸芯２３との間には、正極端子５と負極端子７とが内芯部３７を介して短絡するのを防止するため、厚みの薄い絶縁紙５５が配置されている。 As shown in FIG. 1, the positive electrode terminal 5 joined to the shaft core 23 is made of aluminum, and is formed integrally with a cylindrical terminal body 5a and a central portion in the longitudinal direction of the terminal body 5a. 5b. Similarly to the positive electrode terminal 5, the negative electrode terminal 7 has a cylindrical terminal main body 7a and a flange portion 7b integrally formed at the center in the longitudinal direction of the terminal main body 7a. The positive electrode terminal 5 is fitted in the hole 11 a of the positive electrode side battery lid 11 via an insulating member 41 made of ceramic. The negative electrode terminal 7 is made of copper, and is fitted into the hole 13 a of the negative electrode side battery lid 13 via a ceramic insulating member 43. A screw is formed on the outer periphery of the end portion 5c protruding from the positive electrode side battery cover 11 of the positive electrode terminal 5 to the outside of the battery. A nut 47 is screwed onto the end 5c in a state where a metal washer 45 is fitted. A screw is also formed on the outer periphery of the end 7c of the negative terminal 7 protruding from the negative battery cover 13. A nut 51 is screwed to the end 7c in a state where a metal washer 49 is fitted. An end portion 5 d of the positive electrode terminal 5 protruding into the battery is fitted into one end portion of a cylindrical inner core portion 37 of the shaft core 23. An end 7 d of the negative electrode terminal 7 protruding into the battery is fitted to the other end of the cylindrical inner core 37 of the shaft core 23. A thin insulating paper 55 is disposed between the positive electrode terminal 5 and the shaft core 23 in order to prevent the positive electrode terminal 5 and the negative electrode terminal 7 from being short-circuited via the inner core portion 37. .
本実施の形態の非水電解液二次電池では、極板群３で発生した熱は、軸芯２３の外芯部３９→軸芯２３の内芯部３７→正極端子５及び負極端子７という経路で電池外部に放出される。本実施の形態の非水電解液二次電池では、外芯部３９を構成する絶縁材料が、１〜２０Ｗ／ｍｋの熱伝導率を有しているので、高温時に極板群３で発生した熱を電池外部に十分に放出することができ、しかも低温時における極板群３から内芯部３７への放熱を抑制して二次電池の温度低下を抑制できる。 In the non-aqueous electrolyte secondary battery of the present embodiment, the heat generated in the electrode plate group 3 is referred to as the outer core portion 39 of the shaft core 23 → the inner core portion 37 of the shaft core 23 → the positive electrode terminal 5 and the negative electrode terminal 7. It is discharged to the outside of the battery through the route. In the nonaqueous electrolyte secondary battery of the present embodiment, since the insulating material constituting the outer core portion 39 has a thermal conductivity of 1 to 20 W / mk, it occurred in the electrode plate group 3 at a high temperature. Heat can be sufficiently released to the outside of the battery, and furthermore, heat dissipation from the electrode plate group 3 to the inner core portion 37 at a low temperature can be suppressed to suppress a temperature drop of the secondary battery.
図４は、本発明の他の実施の形態の非水電解液二次電池に用いる軸芯の斜視図である。この軸芯１２３も内芯部１３７と内芯部１３７の外側に設けられた外芯部１３９とを有している。内芯部１３７及び外芯部１３９は、図３に示す内芯部３７及び外芯部３９と同じ材質により形成されている。外芯部１３９は、図３に示す外芯部３９と同じ細長い円筒形を有している。内芯部１３７は、外芯部１３９の長手方向の寸法より短い寸法の円柱形状を有しており、円筒形の外芯部１３９の長手方向の中央に配置されている。このため、外芯部１３９の両端部には、空隙部１３９ａ、１３９ｂが形成されることになる。一方の空隙部１３９ａ内には、正極端子（５）が配置され、内芯部１３７の一方の端部１３７ａは正極端子（５）の端部と接触している。他方の空隙部１３９ｂ内には、負極端子（７）が配置され、内芯部１３７の他方の端部１３７ｂは負極端子（７）の端部と接触している。 FIG. 4 is a perspective view of a shaft core used in a nonaqueous electrolyte secondary battery according to another embodiment of the present invention. The shaft core 123 also has an inner core portion 137 and an outer core portion 139 provided outside the inner core portion 137. The inner core portion 137 and the outer core portion 139 are made of the same material as the inner core portion 37 and the outer core portion 39 shown in FIG. The outer core part 139 has the same elongated cylindrical shape as the outer core part 39 shown in FIG. The inner core part 137 has a columnar shape shorter than the length of the outer core part 139 in the longitudinal direction, and is arranged at the center of the cylindrical outer core part 139 in the longitudinal direction. For this reason, voids 139a and 139b are formed at both ends of the outer core portion 139. The positive electrode terminal (5) is disposed in one gap portion 139a, and one end portion 137a of the inner core portion 137 is in contact with the end portion of the positive electrode terminal (5). A negative electrode terminal (7) is disposed in the other gap portion 139b, and the other end portion 137b of the inner core portion 137 is in contact with the end portion of the negative electrode terminal (7).
このような軸芯１２３は、内芯部１３７が円柱形状を有しているため、図３に示す軸芯２３に比べて、内芯部の熱伝導性を高めることができる。但し、内芯部の重量が大きくなり、電池のエネルギー密度が低下する。また、コストが高くなる。 In such an axial core 123, since the inner core portion 137 has a cylindrical shape, the thermal conductivity of the inner core portion can be increased as compared with the axial core 23 shown in FIG. However, the weight of the inner core portion increases and the energy density of the battery decreases. In addition, the cost increases.
図５は、本発明の更に他の実施の形態の非水電解液二次電池に用いる軸芯の斜視図である。この軸芯２２３も内芯部２３７と内芯部２３７の外側に設けられた外芯部２３９とを有している。内芯部２３７及び外芯部２３９は、図３に示す内芯部３７及び外芯部３９と同じ材質により形成されており、いずれも、長手方向の長さが等しい細長い円筒形を有している。内芯部２３７は、長手方向の中心から両端部に向かうに従って、断面積が徐々に大きくなる形状を有している。また、外芯部２３９は、長手方向の中心から両端部に向かうに従って、断面積が徐々に小さくなる形状を有している。 FIG. 5 is a perspective view of an axial core used in a nonaqueous electrolyte secondary battery according to still another embodiment of the present invention. The shaft core 223 also has an inner core portion 237 and an outer core portion 239 provided outside the inner core portion 237. The inner core portion 237 and the outer core portion 239 are made of the same material as the inner core portion 37 and the outer core portion 39 shown in FIG. 3, and both have an elongated cylindrical shape having the same length in the longitudinal direction. Yes. The inner core portion 237 has a shape in which the cross-sectional area gradually increases from the center in the longitudinal direction toward both ends. Further, the outer core portion 239 has a shape in which the cross-sectional area gradually decreases from the center in the longitudinal direction toward both ends.
このような軸芯２２３は、内芯部２３７と外芯部２３９との接触面積が大きくなるため、内芯部２３７から外芯部２３９への熱伝導性が高くなり、電池の放熱特性が向上する。 Such a shaft core 223 has a large contact area between the inner core portion 237 and the outer core portion 239, so that the thermal conductivity from the inner core portion 237 to the outer core portion 239 is increased, and the heat dissipation characteristics of the battery are improved. To do.
図６は、本発明の更に別の実施の形態の非水電解液二次電池に用いる軸芯の分解斜視図である。この軸芯３２３も、内芯部３３７と内芯部３３７の外側に設けられた外芯部３３９とを有している。外芯部３３９は、図３に示す外芯部３９と同じ細長い円筒形を有しており、該外芯部３９と同じ材質により形成されている。内芯部３３７は、第１の金属部材３３７ｃと絶縁部材３３７ｄと第２の金属部材３３７ｅとから構成されている。第１の金属部材３３７ｃ及び第２の金属部材３３７ｅは、図３に示す内芯部３７より短い円筒形を有しており、該内芯部３７と同じ金属材質により形成されている。絶縁部材３３７ｄは、図３に示す外芯部３９と同じ絶縁材料により形成されており、第１の金属部材３３７ｃと第２の金属部材３３７ｅとの間に配置されている。絶縁部材３３７ｄは、絶縁部材本体３３７ｆと、絶縁部材本体３３７ｆの長手方向の両端に一体に設けられた一対の突出部３３７ｇ，３３７ｈとを有している。一対の突出部３３７ｇ，３３７ｈは、第１の金属部材３３７ｃ及び第２の金属部材３３７ｅの内部にそれぞれ嵌合されている。本例の軸芯３２３では、絶縁部材３３７ｄにより、正極端子（５）と負極端子（７）とが内芯部３３７を介して短絡するのを防止される。 FIG. 6 is an exploded perspective view of a shaft core used in a nonaqueous electrolyte secondary battery according to still another embodiment of the present invention. The shaft core 323 also has an inner core portion 337 and an outer core portion 339 provided outside the inner core portion 337. The outer core portion 339 has the same elongated cylindrical shape as the outer core portion 39 shown in FIG. 3 and is formed of the same material as the outer core portion 39. The inner core portion 337 includes a first metal member 337c, an insulating member 337d, and a second metal member 337e. The first metal member 337 c and the second metal member 337 e have a cylindrical shape shorter than the inner core portion 37 shown in FIG. 3, and are formed of the same metal material as the inner core portion 37. The insulating member 337d is formed of the same insulating material as that of the outer core portion 39 shown in FIG. 3, and is disposed between the first metal member 337c and the second metal member 337e. The insulating member 337d has an insulating member main body 337f and a pair of projecting portions 337g and 337h provided integrally at both ends in the longitudinal direction of the insulating member main body 337f. The pair of protrusions 337g and 337h are fitted in the first metal member 337c and the second metal member 337e, respectively. In the shaft core 323 of this example, the insulating member 337d prevents the positive electrode terminal (5) and the negative electrode terminal (7) from being short-circuited via the inner core portion 337.
なお、上記各例では、内芯部をインサートとしてインサート成形により外芯部を形成したが、内芯部に絶縁材料を塗布することにより外芯部を形成しても構わない。 In each of the above examples, the outer core portion is formed by insert molding using the inner core portion as an insert. However, the outer core portion may be formed by applying an insulating material to the inner core portion.
本発明によれば、高温時に極板群で発生した熱を電池外部に十分に放出することができ、しかも低温時における極板群から金属製の内芯部への熱伝達を抑制して、電池温度の低下を抑制することができる捲回式二次電池を得ることができる。 According to the present invention, heat generated in the electrode plate group at a high temperature can be sufficiently released to the outside of the battery, and heat transfer from the electrode plate group to the metal inner core at a low temperature is suppressed, A wound secondary battery capable of suppressing a decrease in battery temperature can be obtained.
３ 極板群
５ 正極端子
７ 負極端子
１５，１７ 第１及び第２のセパレータ
１９ 正極板
２１ 負極板
２３，１３７，２３７ 軸芯
３７，１３７，２３７ 内芯部
３９，１３９，２３９ 外芯部3 electrode plate group 5 positive electrode terminal 7 negative electrode terminal 15, 17 first and second separator 19 positive electrode plate 21 negative electrode plate 23, 137, 237 shaft core 37, 137, 237 inner core portion 39, 139, 239 outer core portion
Claims (8)
前記外芯部を構成する前記絶縁材料が、１〜２０Ｗ／ｍｋの熱伝導率を有しており、
前記絶縁材料が、絶縁樹脂材料に熱伝導率２０Ｗ／ｍｋ以上の無機充填剤が充填されて構成されており、
前記絶縁樹脂材料がエポキシ樹脂からなり、
前記無機充填剤が金属酸化物、金属窒化物、金属炭化物、金属水酸化物、セラミックスの粉末あるいは繊維、またはこれらの混合物からなり、
前記無機充填剤が前記絶縁樹脂材料１００体積部に対して１０〜１００体積部混合されており、
前記外芯部及び前記内芯部は、筒形状を有しており、
前記外芯部は、長手方向の中心から両端部に向かうに従って、断面積が小さくなる形状を有しており、
前記内芯部は、長手方向の中心から両端部に向かうに従って、断面積が大きくなる形状を有していることを特徴とする捲回式二次電池。A positive electrode plate and a negative electrode plate laminated with a separator in between are wound on an axial core composed of a metal elongated inner core part and an outer core part made of an insulating material provided outside the inner core part. A wound secondary battery having a configured electrode plate group,
The insulating material constituting the outer core portion has a thermal conductivity of 1 to 20 W / mk,
The insulating material is configured by filling an insulating resin material with an inorganic filler having a thermal conductivity of 20 W / mk or more,
The insulating resin material is made of epoxy resin,
The inorganic filler comprises a metal oxide, metal nitride, metal carbide, metal hydroxide, ceramic powder or fiber, or a mixture thereof;
10 to 100 parts by volume of the inorganic filler is mixed with 100 parts by volume of the insulating resin material,
The outer core part and the inner core part have a cylindrical shape,
The outer core portion has a shape in which the cross-sectional area decreases as it goes from the center in the longitudinal direction to both ends,
The wound secondary battery, wherein the inner core portion has a shape in which a cross-sectional area increases from the longitudinal center toward both ends.
前記外芯部を構成する前記絶縁材料が、１〜２０Ｗ／ｍｋの熱伝導率を有することを特徴とする捲回式二次電池。A positive electrode plate and a negative electrode plate laminated with a separator in between are wound on an axial core composed of a metal elongated inner core part and an outer core part made of an insulating material provided outside the inner core part. A wound secondary battery having a configured electrode plate group,
The wound secondary battery, wherein the insulating material constituting the outer core portion has a thermal conductivity of 1 to 20 W / mk.
前記無機充填剤が金属酸化物、金属窒化物、金属炭化物、金属水酸化物、セラミックスの粉末あるいは繊維、またはこれらの混合物からなることを特徴とする請求項３に記載の捲回式二次電池。The insulating resin material is made of epoxy resin,
The wound secondary battery according to claim 3, wherein the inorganic filler is made of metal oxide, metal nitride, metal carbide, metal hydroxide, ceramic powder or fiber, or a mixture thereof. .
前記内芯部は、円柱形状を有していることを特徴とする請求項２〜５のいずれか１つに記載の捲回式二次電池。The outer core portion has a cylindrical shape,
The wound secondary battery according to any one of claims 2 to 5, wherein the inner core portion has a cylindrical shape.
前記外芯部は、長手方向の中心から両端部に向かうに従って、断面積が小さくなる形状を有しており、
前記内芯部は、長手方向の中心から両端部に向かうに従って、断面積が大きくなる形状を有していることを特徴とする請求項２〜５のいずれか１つに記載の捲回式二次電池。The outer core part and the inner core part have a cylindrical shape,
The outer core portion has a shape in which the cross-sectional area decreases as it goes from the center in the longitudinal direction to both ends,
6. The wound type two according to claim 2, wherein the inner core portion has a shape in which a cross-sectional area increases from the longitudinal center toward both ends. Next battery.
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| WO2016152688A1 (en) * | 2015-03-23 | 2016-09-29 | 日本碍子株式会社 | Heat dissipation adjustment structure, battery pack, and fluid flow device |
| KR102201348B1 (en) * | 2017-01-17 | 2021-01-08 | 주식회사 엘지화학 | Fabricating method of battery module |
| KR102207881B1 (en) * | 2017-01-17 | 2021-01-25 | 주식회사 엘지화학 | Battery module, battery pack comprising the battery module and vehicle comprising the battery pack |
| KR102308017B1 (en) * | 2017-12-01 | 2021-09-30 | 주식회사 엘지에너지솔루션 | Cylindrical Secondary Battery having Hollow portion filled with Thermal Conductive Resin |
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