WO2018049577A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018049577A1
WO2018049577A1 PCT/CN2016/098930 CN2016098930W WO2018049577A1 WO 2018049577 A1 WO2018049577 A1 WO 2018049577A1 CN 2016098930 W CN2016098930 W CN 2016098930W WO 2018049577 A1 WO2018049577 A1 WO 2018049577A1
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WO
WIPO (PCT)
Prior art keywords
metal layer
secondary battery
flange
edge
exposed
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Application number
PCT/CN2016/098930
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French (fr)
Chinese (zh)
Inventor
张亚杰
何平
郭培培
殷科
程文强
Original Assignee
东莞新能源科技有限公司
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Application filed by 东莞新能源科技有限公司 filed Critical 东莞新能源科技有限公司
Priority to PCT/CN2016/098930 priority Critical patent/WO2018049577A1/en
Publication of WO2018049577A1 publication Critical patent/WO2018049577A1/en

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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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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

Definitions

  • the present invention relates to the field of batteries, and more particularly to a secondary battery.
  • the bare cell of lithium battery is covered by the upper and lower packaging films, there will be a very thin metal layer at the interface of the coating.
  • the exposed metal layer has the risk of short-circuiting the electrical components and the exposed air of the metal layer is easily corroded or oxidized. Safety quality issues.
  • the battery core will have a rectangular notch on the side seal after the hi-pot (high potential test) test, which will cause the exposed metal in this area.
  • the current solution can only be to manually fold the gap in the hi-pot test area to wrap the exposed metal inside, which causes large manual errors, poor product stability, uncontrollable quality of the fold, and manual Lead to increased cost of the product.
  • an object of the present invention is to provide a secondary battery which can prevent the metal layer of the casing from being exposed, prevent short-circuiting and corrosion of the secondary battery, and improve the safety performance of the secondary battery.
  • the present invention provides a secondary battery comprising: a battery core having a tab; and a housing formed by sealingly connecting two upper and lower packaging films, the packaging film comprising an inner insulating layer, a metal layer, and An outer insulating layer, and the metal layer is between the inner insulating layer and the outer insulating layer.
  • the housing has a main body portion for accommodating the electric core, two side sealing portions respectively located at two sides of the main body portion in the width direction, and a notch disposed at a front end of the corresponding side sealing portion along the length direction, and exposing the metal layer at the edge .
  • each side seal portion has a first hemming edge and a second hemming edge; the second hemming edge extends in a thickness direction; a metal layer is exposed at the edge of the first hemming edge, and is folded back on the second hemming edge to make the first hemming edge
  • the exposed metal layer is between the second hem and the side of the body portion in the width direction.
  • An insulating colloid covering the exposed metal layer is provided at the edge of the notch.
  • the double-folded structure formed by the side seal portion causes the metal layer exposed by the first folded edge to be sandwiched between the second folded edge and the side surface of the main body portion, which can effectively prevent the metal from being exposed.
  • Short circuit and corrosion no need to stick adhesive tape, save material; the gap on the side seal for the voltage test of the battery core exposes the metal layer at the edge, and the metal can be exposed by providing the insulating glue at the edge of the notch.
  • the layer is coated to avoid short circuit and corrosion caused by the exposure of the metal layer, and the safety performance of the secondary battery is improved.
  • the process of providing the insulating colloid at the edge of the notch is simple (for example, coating, injection molding), and the applicability is good, compared with the prior art folding scheme, the safety and reliability are high, the quality is controllable and the cost is relatively high. low.
  • FIG. 1 is a schematic view of a second folded front of a secondary battery according to the present invention.
  • Figure 2 is a schematic view showing an embodiment of a secondary battery according to the present invention.
  • Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
  • Figure 4 is an enlarged view of a circled portion of Figure 3;
  • Fig. 5 is a schematic view showing another embodiment of a secondary battery according to the present invention.
  • a secondary battery according to the present invention includes: a battery cell 4 having a tab S; And the casing 1 is sealed and connected by two upper and lower packaging films.
  • the packaging film comprises an inner insulating layer, a metal layer and an outer insulating layer, and the metal layer is located between the inner insulating layer and the outer insulating layer.
  • the housing 1 has a main body portion 11 that houses the battery cells 4, two side seal portions 14 that are respectively located on both sides of the main body portion 11 in the width direction W, and a notch 13 that is disposed in the longitudinal direction L of the corresponding side seal portion 14. The front end and a metal layer is exposed at the edges.
  • Each of the side seal portions 14 has a first flange 142 and a second flange 141; the second flange 141 extends in the thickness direction T; the metal layer is exposed at the edge of the first flange 142, and is folded back at the second flange 141.
  • the metal layer exposing the first flange 142 is between the second flange 141 and the side surface 111 of the body portion 11 in the width direction W.
  • An insulating colloid 2 covering the exposed metal layer is provided at the edge of the notch 13.
  • the double-hem structure (the second flange 141 and the first flange 142) formed by the side seal portion 14 causes the metal layer exposed by the first flange 142 to be sandwiched by the second flange 141 and the side surface 111 of the main body portion 11 can effectively avoid short circuit and corrosion caused by metal exposure, and no need to stick adhesive tape to save material;
  • the side seal portion 14 is used for pressure test of the battery core 4 (high potential)
  • the notch 13 of the test exposes the metal layer at the edge, and the exposed metal layer can be covered by providing the insulating colloid 2 at the edge of the notch 13, so as to avoid short circuit and corrosion caused by the exposure of the metal layer, and improve the safety performance of the secondary battery.
  • the process of providing the insulating colloid 2 at the edge of the notch 13 is simple (for example, coating, injection molding), and the applicability is good, and the safety and reliability are high, and the quality is controllable compared with the prior art folding solution. The cost is lower.
  • the inner insulating layer is polypropylene
  • the outer insulating layer is nylon
  • the metal layer is aluminum foil, steel foil or copper foil.
  • the casing 1 further has a top sealing portion 12 located on the front side of the main body portion 11 in the longitudinal direction L, and the tab of the battery cell 4 S protrudes from the top seal portion 12.
  • the top sealing portion 12 exposes a metal layer at an edge on the front side in the longitudinal direction L; referring to FIG. 1, FIG. 2 and FIG. 5, the top sealing portion 12 is provided with an insulating colloid 2 to cover the metal layer exposed by the top sealing portion 12. .
  • the top sealing portion 12 of the casing 1 needs to be cut, thereby causing the top sealing portion 12 to expose the metal layer at the edge on the front side in the longitudinal direction L.
  • the insulating paste 2 is disposed on the top sealing portion 12 to cover the metal layer exposed by the top sealing portion 12, thereby avoiding short circuit and corrosion caused by exposure of the metal layer, and improving The safety performance of the secondary battery.
  • the process of the edge colloid 2 is simple (for example, coating, injection molding), has good applicability, high safety and reliability, and low cost.
  • the secondary battery further includes an adhesive material 3, and the side seal portions 14 are bonded to the main body portion 11 in the width direction W. On the side 111.
  • a portion of the second flange 141 exposed to the first flange 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W via the bonding material 3; and/or the first The flange 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W via the bonding material 3 . That is, the position where the bonding material 3 is laid may be on the second folded edge 141, or on the first folded edge 142, or may be laid on the second folded edge 141 and the first folded edge 142 at the same time (as shown in the figure). 4)).
  • the bonding material 3 is a double-sided tape.
  • the first flange 142 and the second flange 141 form a folded edge E;
  • the backing edge E is provided with an insulating colloid 2. Since the folding edge E is at a position where the first flange 142 is folded back from the second flange 141, the outer insulating layer at the folded edge E is easily worn and the metal layer is exposed during use of the secondary battery, so Providing the insulating colloid 2 on the folding edge E can prevent short circuit and corrosion caused when the metal layer is exposed.
  • the casing 1 further has a bottom sealing portion 15 located at the rear side of the main body portion 11 in the longitudinal direction L, and a rear side of the bottom sealing portion 15 along the longitudinal direction L.
  • a metal layer is exposed at the edge; correspondingly, the bottom sealing portion 15 is provided with an insulating colloid 2 to cover the metal layer exposed by the bottom sealing portion 15.
  • the insulating colloid 2 is a U-shaped structure covering the metal layer exposed at the edge of the notch 13.
  • the insulating colloid 2 is disposed on the edge of the notch 13 by injection molding, coating or coating.
  • the side seal portions 14 are bent to form the second folded edges 141 and the first folded edges 142.
  • the insulating colloid 2 is applied at the folded edge E between the second folded edge 141 and the first folded edge 142, at the edge of the notch 13 and at the edge of the top seal portion 12, and in the second The hem 141 and the first hem 142 are coated with the bonding material 3; finally, referring to FIG. 2, the second hem 141 is bent so that the second hem 141 The bonding material 3 on the first folded edge 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W to form the secondary battery of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A secondary battery, comprising: a cell (4) having terminal tabs (S); and a case (1) composed of an upper and lower packaging film layer sealingly connected, wherein the packing film comprises an inner insulation layer, a metal layer, and an outer insulation layer, and the metal layer is located between the inner insulation layer and the outer insulation layer. The case (1) has: a main body (11) for accommodating the cell (4); two side sealing portions (14) respectively located on two sides of the main body (11) in the width direction (W); and gaps (13) disposed at front ends of corresponding side sealing portions (14) in the length direction (L), and exposing the metal layer at edges thereof. Each of the side sealing portions (14) has a first folding periphery (142) and a second folding periphery (141). The second folding periphery (141) extends in the width direction (T). The metal layer is exposed at the edge of the first folding periphery (142), and the first folding periphery is folded back on the second folding periphery (141), such that the metal layer exposed from the first folding periphery (142) is between the second folding periphery (141) and a side face (111) of the main body (11) on the width direction (W). Insulating cement members (2) coating the exposed metal layers are provided at the edges of the gaps (13). The secondary battery of the present invention prevents exposure of a metal layer of the case (1), and accordingly avoids a short circuit condition and erosion of the secondary battery, thus improving safety of the secondary battery.

Description

二次电池Secondary battery 技术领域Technical field
本发明涉及电池领域，尤其涉及一种二次电池。The present invention relates to the field of batteries, and more particularly to a secondary battery.
背景技术Background technique
锂电池裸电芯被上下两个包装膜包覆后，在包覆的界面会存在很细的金属层，金属层裸露有导致电器元件短路的风险且金属层暴露空气易被腐蚀或氧化，潜在的安全质量问题。After the bare cell of lithium battery is covered by the upper and lower packaging films, there will be a very thin metal layer at the interface of the coating. The exposed metal layer has the risk of short-circuiting the electrical components and the exposed air of the metal layer is easily corroded or oxidized. Safety quality issues.
目前电芯在做hi-pot(high potential test，耐压测试)测试后会在侧封边留有一个矩形的缺口，会造成此区域的露金属。目前解决的办法只能是对hi-pot测试区的缺口进行手动翻折，以将露出的金属包裹在内部，这样造成手工误差大，产品的稳定性差，翻折的质量不可控，同时，人工导致产品的成本提高。At present, the battery core will have a rectangular notch on the side seal after the hi-pot (high potential test) test, which will cause the exposed metal in this area. The current solution can only be to manually fold the gap in the hi-pot test area to wrap the exposed metal inside, which causes large manual errors, poor product stability, uncontrollable quality of the fold, and manual Lead to increased cost of the product.
发明内容Summary of the invention
鉴于背景技术中存在的问题，本发明的目的在于提供一种二次电池，其能避免壳体的金属层露出，防止二次电池的短路和腐蚀，提高二次电池的安全性能。In view of the problems in the background art, an object of the present invention is to provide a secondary battery which can prevent the metal layer of the casing from being exposed, prevent short-circuiting and corrosion of the secondary battery, and improve the safety performance of the secondary battery.
为了实现上述目的，本发明提供了一种二次电池，其包括：电芯，具有极耳；以及壳体，由上下两层包装膜密封连接而成，包装膜包括内绝缘层、金属层及外绝缘层，且金属层位于内绝缘层和外绝缘层之间。壳体具有：主体部，收容电芯；两个侧封部，分别位于主体部沿宽度方向的两侧；以及缺口，设置在对应侧封部沿长度方向的前端，且在边缘处露出金属层。In order to achieve the above object, the present invention provides a secondary battery comprising: a battery core having a tab; and a housing formed by sealingly connecting two upper and lower packaging films, the packaging film comprising an inner insulating layer, a metal layer, and An outer insulating layer, and the metal layer is between the inner insulating layer and the outer insulating layer. The housing has a main body portion for accommodating the electric core, two side sealing portions respectively located at two sides of the main body portion in the width direction, and a notch disposed at a front end of the corresponding side sealing portion along the length direction, and exposing the metal layer at the edge .
其中，各侧封部具有第一折边和第二折边；第二折边沿厚度方向延伸；第一折边边缘处露出金属层，且回折在第二折边上，以使第一折边露出的金属层处于第二折边和主体部的沿宽度方向的侧面之间。缺口的边缘处设有将露出金属层包覆的绝缘胶体。 Wherein, each side seal portion has a first hemming edge and a second hemming edge; the second hemming edge extends in a thickness direction; a metal layer is exposed at the edge of the first hemming edge, and is folded back on the second hemming edge to make the first hemming edge The exposed metal layer is between the second hem and the side of the body portion in the width direction. An insulating colloid covering the exposed metal layer is provided at the edge of the notch.
本发明的有益效果如下：The beneficial effects of the present invention are as follows:
在根据本发明的二次电池中，侧封部形成的双折边结构使得第一折边露出的金属层夹持在第二折边和主体部的侧面之间，能够有效的避免金属外露造成的短路和腐蚀，同时无需粘贴胶纸，节省材料；侧封部上用于对电芯进行耐压测试的缺口在边缘处露出金属层，而通过在缺口的边缘处设置绝缘胶体可以将露出金属层包覆，以避免金属层露出导致的短路和腐蚀，提高二次电池的安全性能。同时，在缺口的边缘处设置绝缘胶体的工艺简单(例如涂覆、注塑)，适用性好，与现有技术中翻折的方案相比，安全性和可靠性高，质量可控且成本较低。In the secondary battery according to the present invention, the double-folded structure formed by the side seal portion causes the metal layer exposed by the first folded edge to be sandwiched between the second folded edge and the side surface of the main body portion, which can effectively prevent the metal from being exposed. Short circuit and corrosion, no need to stick adhesive tape, save material; the gap on the side seal for the voltage test of the battery core exposes the metal layer at the edge, and the metal can be exposed by providing the insulating glue at the edge of the notch. The layer is coated to avoid short circuit and corrosion caused by the exposure of the metal layer, and the safety performance of the secondary battery is improved. At the same time, the process of providing the insulating colloid at the edge of the notch is simple (for example, coating, injection molding), and the applicability is good, compared with the prior art folding scheme, the safety and reliability are high, the quality is controllable and the cost is relatively high. low.
附图说明DRAWINGS
图1为根据本发明的二次电池的第二折边弯折前的示意图；1 is a schematic view of a second folded front of a secondary battery according to the present invention;
图2为根据本发明的二次电池的一实施例的示意图；Figure 2 is a schematic view showing an embodiment of a secondary battery according to the present invention;
图3为图2沿线A-A作出的剖视图；Figure 3 is a cross-sectional view taken along line A-A of Figure 2;
图4为图3圆圈部分的放大图；Figure 4 is an enlarged view of a circled portion of Figure 3;
图5为根据本发明的二次电池的另一实施例的示意图。Fig. 5 is a schematic view showing another embodiment of a secondary battery according to the present invention.
其中，附图标记说明如下：Among them, the reference numerals are as follows:
1壳体                        2绝缘封装体1 housing 2 insulation package
11主体部                     3粘接材料11 main body 3 bonding material
111侧面                      4电芯111 side 4 batteries
12顶封部                     S极耳12 top seals S-ears
13缺口                       E回折棱13 notch E fold back edge
14侧封部                     L长度方向14 side seals L length direction
141第二折边                  W宽度方向141 second flange W width direction
142第一折边                  T厚度方向142 first flange T thickness direction
15底封部15 bottom seal
具体实施方式detailed description
下面参照附图来详细说明本发明的二次电池。The secondary battery of the present invention will be described in detail below with reference to the drawings.
参照图1至图5，根据本发明的二次电池包括：电芯4，具有极耳S；以 及壳体1，由上下两层包装膜密封连接而成，包装膜包括内绝缘层、金属层及外绝缘层，且金属层位于内绝缘层和外绝缘层之间。壳体1具有：主体部11，收容电芯4；两个侧封部14，分别位于主体部11沿宽度方向W的两侧；以及缺口13，设置在对应侧封部14沿长度方向L的前端，且在边缘处露出金属层。1 to 5, a secondary battery according to the present invention includes: a battery cell 4 having a tab S; And the casing 1 is sealed and connected by two upper and lower packaging films. The packaging film comprises an inner insulating layer, a metal layer and an outer insulating layer, and the metal layer is located between the inner insulating layer and the outer insulating layer. The housing 1 has a main body portion 11 that houses the battery cells 4, two side seal portions 14 that are respectively located on both sides of the main body portion 11 in the width direction W, and a notch 13 that is disposed in the longitudinal direction L of the corresponding side seal portion 14. The front end and a metal layer is exposed at the edges.
其中，各侧封部14具有第一折边142和第二折边141；第二折边141沿厚度方向T延伸；第一折边142边缘处露出金属层，且回折在第二折边141上，以使第一折边142露出的金属层处于第二折边141和主体部11的沿宽度方向W的侧面111之间。缺口13的边缘处设有将露出金属层包覆的绝缘胶体2。Each of the side seal portions 14 has a first flange 142 and a second flange 141; the second flange 141 extends in the thickness direction T; the metal layer is exposed at the edge of the first flange 142, and is folded back at the second flange 141. Upper, the metal layer exposing the first flange 142 is between the second flange 141 and the side surface 111 of the body portion 11 in the width direction W. An insulating colloid 2 covering the exposed metal layer is provided at the edge of the notch 13.
在根据本发明的二次电池中，侧封部14形成的双折边结构(第二折边141和第一折边142)使得第一折边142露出的金属层夹持在第二折边141和主体部11的侧面111之间，能够有效的避免金属外露造成的短路和腐蚀，同时无需粘贴胶纸，节省材料；侧封部14上用于对电芯4进行耐压测试(high potential test)的缺口13在边缘处露出金属层，而通过在缺口13的边缘处设置绝缘胶体2可以将露出金属层包覆，以避免金属层露出导致的短路和腐蚀，提高二次电池的安全性能。同时，在缺口13的边缘处设置绝缘胶体2的工艺简单(例如涂覆、注塑)，适用性好，与现有技术中翻折的方案相比，安全性和可靠性高，质量可控且成本较低。In the secondary battery according to the present invention, the double-hem structure (the second flange 141 and the first flange 142) formed by the side seal portion 14 causes the metal layer exposed by the first flange 142 to be sandwiched by the second flange 141 and the side surface 111 of the main body portion 11 can effectively avoid short circuit and corrosion caused by metal exposure, and no need to stick adhesive tape to save material; the side seal portion 14 is used for pressure test of the battery core 4 (high potential) The notch 13 of the test) exposes the metal layer at the edge, and the exposed metal layer can be covered by providing the insulating colloid 2 at the edge of the notch 13, so as to avoid short circuit and corrosion caused by the exposure of the metal layer, and improve the safety performance of the secondary battery. . At the same time, the process of providing the insulating colloid 2 at the edge of the notch 13 is simple (for example, coating, injection molding), and the applicability is good, and the safety and reliability are high, and the quality is controllable compared with the prior art folding solution. The cost is lower.
在根据本发明的二次电池中，内绝缘层为聚丙烯，外绝缘层为尼龙，金属层为铝箔、钢箔或铜箔。In the secondary battery according to the present invention, the inner insulating layer is polypropylene, the outer insulating layer is nylon, and the metal layer is aluminum foil, steel foil or copper foil.
在根据本发明的二次电池中，参照图1、图2和图5，壳体1还具有：顶封部12，位于主体部11沿长度方向L的前侧，且电芯4的极耳S从顶封部12伸出。顶封部12在沿长度方向L前侧的边缘处露出金属层；参照图1、图2和图5，顶封部12上设有绝缘胶体2，以包覆顶封部12露出的金属层。在将上下两层包装膜密封连接形成壳体1时，需要对壳体1的顶封部12进行裁切，从而会导致顶封部12在沿长度方向L前侧的边缘处露出金属层，露出的金属层容易导致二次电池的短路和腐蚀，因此，在顶封部12上设置绝缘胶体2以包覆顶封部12露出的金属层，从而避免金属层露出导致的短路和腐蚀，提高二次电池的安全性能。同时，在顶封部12的边缘处设置绝 缘胶体2的工艺简单(例如涂覆、注塑)，适用性好，安全性和可靠性高，成本较低。In the secondary battery according to the present invention, referring to FIGS. 1, 2, and 5, the casing 1 further has a top sealing portion 12 located on the front side of the main body portion 11 in the longitudinal direction L, and the tab of the battery cell 4 S protrudes from the top seal portion 12. The top sealing portion 12 exposes a metal layer at an edge on the front side in the longitudinal direction L; referring to FIG. 1, FIG. 2 and FIG. 5, the top sealing portion 12 is provided with an insulating colloid 2 to cover the metal layer exposed by the top sealing portion 12. . When the upper and lower packaging films are sealingly joined to form the casing 1, the top sealing portion 12 of the casing 1 needs to be cut, thereby causing the top sealing portion 12 to expose the metal layer at the edge on the front side in the longitudinal direction L. The exposed metal layer is liable to cause short circuit and corrosion of the secondary battery. Therefore, the insulating paste 2 is disposed on the top sealing portion 12 to cover the metal layer exposed by the top sealing portion 12, thereby avoiding short circuit and corrosion caused by exposure of the metal layer, and improving The safety performance of the secondary battery. At the same time, at the edge of the top seal 12 The process of the edge colloid 2 is simple (for example, coating, injection molding), has good applicability, high safety and reliability, and low cost.
在根据本发明的二次电池中，参照图1、图3和图4，所述二次电池还包括：粘接材料3，将各侧封部14粘接在主体部11沿宽度方向W的侧面111上。In the secondary battery according to the present invention, referring to FIG. 1, FIG. 3 and FIG. 4, the secondary battery further includes an adhesive material 3, and the side seal portions 14 are bonded to the main body portion 11 in the width direction W. On the side 111.
在根据本发明的二次电池中，第二折边141的露出于第一折边142的部分经由粘接材料3粘接在主体部11的沿宽度方向W的侧面111；和/或第一折边142经由粘接材料3粘接在主体部11的沿宽度方向W的侧面111。也就是说，粘接材料3铺设的位置可以在第二折边141上，也可以在第一折边142上，还可以同时铺设在第二折边141和第一折边142上(如图4所示)。In the secondary battery according to the present invention, a portion of the second flange 141 exposed to the first flange 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W via the bonding material 3; and/or the first The flange 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W via the bonding material 3 . That is, the position where the bonding material 3 is laid may be on the second folded edge 141, or on the first folded edge 142, or may be laid on the second folded edge 141 and the first folded edge 142 at the same time (as shown in the figure). 4)).
在根据本发明的二次电池中，粘接材料3为双面胶带。In the secondary battery according to the present invention, the bonding material 3 is a double-sided tape.
在根据本发明的二次电池中，参照图4，在第一折边142从第二折边141的回折的位置处，第一折边142和第二折边141形成回折棱E；对应地，回折棱E上设有绝缘胶体2。由于回折棱E是在第一折边142从第二折边141的回折的位置处，所以在二次电池的使用过程中，回折棱E处的外绝缘层容易磨损并将金属层露出，所以，在回折棱E上设置绝缘胶体2可以防止金属层露出时导致的短路和腐蚀。In the secondary battery according to the present invention, referring to FIG. 4, at a position where the first flange 142 is folded back from the second flange 141, the first flange 142 and the second flange 141 form a folded edge E; The backing edge E is provided with an insulating colloid 2. Since the folding edge E is at a position where the first flange 142 is folded back from the second flange 141, the outer insulating layer at the folded edge E is easily worn and the metal layer is exposed during use of the secondary battery, so Providing the insulating colloid 2 on the folding edge E can prevent short circuit and corrosion caused when the metal layer is exposed.
在根据本发明的二次电池中，参照图5，壳体1还具有：底封部15，位于主体部11沿长度方向L的后侧；底封部15的沿长度方向L的后侧的边缘处露出金属层；对应地，底封部15上设有绝缘胶体2，以包覆底封部15露出的金属层。In the secondary battery according to the present invention, referring to FIG. 5, the casing 1 further has a bottom sealing portion 15 located at the rear side of the main body portion 11 in the longitudinal direction L, and a rear side of the bottom sealing portion 15 along the longitudinal direction L. A metal layer is exposed at the edge; correspondingly, the bottom sealing portion 15 is provided with an insulating colloid 2 to cover the metal layer exposed by the bottom sealing portion 15.
在根据本发明的二次电池中，参照图3和图4，绝缘胶体2为U形结构，包覆缺口13边缘露出的金属层。In the secondary battery according to the present invention, referring to Figs. 3 and 4, the insulating colloid 2 is a U-shaped structure covering the metal layer exposed at the edge of the notch 13.
在根据本发明的二次电池中，绝缘胶体2通过注塑、涂覆或贴覆设置在缺口13的边缘上。In the secondary battery according to the present invention, the insulating colloid 2 is disposed on the edge of the notch 13 by injection molding, coating or coating.
在根据本发明的二次电池中，在对上下两层包装膜热压、裁切后，首先，参照图1，将侧封部14弯折以形成第二折边141和第一折边142；其次，参照图1，在第二折边141和第一折边142之间的回折棱E处、缺口13的边缘处及顶封部12的边缘处涂覆绝缘胶体2，并在第二折边141和第一折边142上涂覆粘接材料3；最后，参照图2，弯折第二折边141以使第二折边141 和第一折边142上的粘接材料3粘接到主体部11的沿宽度方向W的侧面111上，进而形成本发明的二次电池。 In the secondary battery according to the present invention, after the upper and lower two-layer packaging films are hot-pressed and cut, first, referring to FIG. 1, the side seal portions 14 are bent to form the second folded edges 141 and the first folded edges 142. Secondly, referring to FIG. 1, the insulating colloid 2 is applied at the folded edge E between the second folded edge 141 and the first folded edge 142, at the edge of the notch 13 and at the edge of the top seal portion 12, and in the second The hem 141 and the first hem 142 are coated with the bonding material 3; finally, referring to FIG. 2, the second hem 141 is bent so that the second hem 141 The bonding material 3 on the first folded edge 142 is bonded to the side surface 111 of the main body portion 11 in the width direction W to form the secondary battery of the present invention.

Claims (10)

  1. 一种二次电池，包括：A secondary battery comprising:
    电芯(4)，具有极耳(S)；Battery (4) having a tab (S);
    壳体(1)，由上下两层包装膜密封连接而成，包装膜包括内绝缘层、金属层及外绝缘层，且金属层位于内绝缘层和外绝缘层之间，壳体(1)具有：The casing (1) is sealed and connected by two upper and lower packaging films, and the packaging film comprises an inner insulating layer, a metal layer and an outer insulating layer, and the metal layer is located between the inner insulating layer and the outer insulating layer, and the casing (1) have:
    主体部(11)，收容电芯(4)；a main body portion (11) for accommodating a battery core (4);
    两个侧封部(14)，分别位于主体部(11)沿宽度方向(W)的两侧；以及Two side seal portions (14) respectively located on both sides of the main body portion (11) in the width direction (W);
    缺口(13)，设置在对应侧封部(14)沿长度方向(L)的前端，且在边缘处露出金属层；a notch (13) disposed at a front end of the corresponding side seal portion (14) along the length direction (L) and exposing a metal layer at the edge;
    其特征在于，It is characterized in that
    各侧封部(14)具有第一折边(142)和第二折边(141)；Each side seal portion (14) has a first flange (142) and a second flange (141);
    第二折边(141)沿厚度方向(T)延伸；The second flange (141) extends in the thickness direction (T);
    第一折边(142)边缘处露出金属层，且回折在第二折边(141)上，以使第一折边(142)露出的金属层处于第二折边(141)和主体部(11)的沿宽度方向(W)的侧面(111)之间；A metal layer is exposed at an edge of the first flange (142) and folded back on the second flange (141) such that the exposed metal layer of the first flange (142) is at the second flange (141) and the body portion ( 11) between the sides (111) in the width direction (W);
    缺口(13)的边缘处设有将露出金属层包覆的绝缘胶体(2)。An insulating colloid (2) covering the exposed metal layer is provided at the edge of the notch (13).
  2. 根据权利要求1所述的二次电池，其特征在于，其中，内绝缘层为聚丙烯，外绝缘层为尼龙，金属层为铝箔、钢箔或铜箔。The secondary battery according to claim 1, wherein the inner insulating layer is polypropylene, the outer insulating layer is nylon, and the metal layer is aluminum foil, steel foil or copper foil.
  3. 根据权利要求1所述的二次电池，其特征在于，The secondary battery according to claim 1, wherein
    壳体(1)还具有：顶封部(12)，位于主体部(11)沿长度方向(L)的前侧，且电芯(4)的极耳(S)从顶封部(12)伸出；The housing (1) further has a top sealing portion (12) located on the front side of the main body portion (11) in the longitudinal direction (L), and the tab (S) of the battery core (4) is from the top sealing portion (12) Extend
    顶封部(12)在沿长度方向(L)前侧的边缘处露出金属层；The top sealing portion (12) exposes the metal layer at the edge on the front side in the longitudinal direction (L);
    顶封部(12)上设有绝缘胶体(2)，以包覆顶封部(12)露出的金属层。 An insulating layer (2) is disposed on the top sealing portion (12) to cover the metal layer exposed by the top sealing portion (12).
  4. 根据权利要求1所述的二次电池，其特征在于，The secondary battery according to claim 1, wherein
    所述二次电池还包括：粘接材料(3)，将各侧封部(14)粘接在主体部(11)沿宽度方向(W)的侧面(111)上。The secondary battery further includes an adhesive material (3) that bonds the side seal portions (14) to the side surface (111) of the main body portion (11) in the width direction (W).
  5. 根据权利要求4所述的二次电池，其特征在于，The secondary battery according to claim 4, wherein
    第二折边(141)的露出于第一折边(142)的部分经由粘接材料(3)粘接在主体部(11)的沿宽度方向(W)的侧面(111)；和/或a portion of the second hem (141) exposed to the first hem (142) is bonded to a side surface (111) of the main body portion (11) in the width direction (W) via an adhesive material (3); and/or
    第一折边(142)经由粘接材料(3)粘接在主体部(11)的沿宽度方向(W)的侧面(111)。The first flange (142) is bonded to the side surface (111) of the main body portion (11) in the width direction (W) via the bonding material (3).
  6. 根据权利要求4所述的二次电池，其特征在于，粘接材料(3)为双面胶带。The secondary battery according to claim 4, wherein the bonding material (3) is a double-sided tape.
  7. 根据权利要求1所述的二次电池，其特征在于，The secondary battery according to claim 1, wherein
    在第一折边(142)从第二折边(141)的回折的位置处，第一折边(142)和第二折边(141)形成回折棱(E)；The first flange (142) and the second flange (141) form a foldback edge (E) at a position where the first flange (142) is folded back from the second flange (141);
    回折棱(E)上设有绝缘胶体(2)。An insulating colloid (2) is provided on the folding edge (E).
  8. 根据权利要求1所述的二次电池，其特征在于，The secondary battery according to claim 1, wherein
    壳体(1)还具有：底封部(15)，位于主体部(11)沿长度方向(L)的后侧；The housing (1) further has a bottom sealing portion (15) located at a rear side of the main body portion (11) along the length direction (L);
    底封部(15)的沿长度方向(L)的后侧的边缘处露出金属层；a metal layer is exposed at an edge of the bottom seal portion (15) along the rear side of the length direction (L);
    底封部(15)上设有绝缘胶体(2)，以包覆底封部(15)露出的金属层。The bottom seal portion (15) is provided with an insulating colloid (2) to cover the metal layer exposed by the bottom seal portion (15).
  9. 根据权利要求1所述的二次电池，其特征在于，绝缘胶体(2)为U形结构，包覆缺口(13)边缘露出的金属层。The secondary battery according to claim 1, wherein the insulating colloid (2) has a U-shaped structure covering a metal layer exposed at an edge of the notch (13).
  10. 根据权利要求1所述的二次电池，其特征在于，绝缘胶体(2)通过注塑、涂覆或贴覆设置在缺口(13)的边缘上。 A secondary battery according to claim 1, characterized in that the insulating colloid (2) is provided on the edge of the notch (13) by injection molding, coating or coating.
PCT/CN2016/098930 2016-09-13 2016-09-13 Secondary battery WO2018049577A1 (en)

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CN114284539A (en) * 2020-09-18 2022-04-05 宁德新能源科技有限公司 Battery with a battery cell

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