This application claims the benefit of priority based on the 24-day Korea Patent Application No. 2017-0052485 four years 2017, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]
The present invention in order to maintain the battery safety according to the volume expansion or excessive charging, such as swelling due to gas generated in unsteady state of that More specifically, the pouch-shaped battery cell, a secondary battery including the electrode lead using a conductive polymer It relates to a secondary battery including the electrode lead using a conductive polymer for short-circuiting the electrode lead.
BACKGROUND
[3]
In general, the kind of the secondary batteries include nickel-cadmium batteries, nickel hydrogen batteries, lithium ion batteries and lithium ion polymer batteries. Such secondary batteries digital camera, P-DVD, MP3P, cell phone, PDA, Portable Game Device, Power Tool and large products and surplus as well as small items as well, such as E-bike, which require high power, such as electric cars or hybrid cars is used is applied to the electric power storage device and the backup energy storage device which stores generated power and renewable energy.
[4]
The lithium secondary battery generally be made of a cathode (Cathode), a separator (Separator) and the negative electrode (Anode), their material is selected in consideration of the battery life, charge and discharge capacity, temperature characteristics and stability. In general, the lithium secondary battery has been designed as a five-layer structure of the branches, or an anode / separator / anode / separator / cathode or anode / separator / cathode / separator / cathode, a three-layer structure of cathode / separator / anode, wherein the unit cells are one of the electrode assembly or the secondary battery together.
[5]
Lithium secondary batteries that can be charged and discharged proceeds lithium ion insertion (intercalation) of graphite electrode from the negative electrode of a lithium metal oxide of the positive electrode, and while repeating the process of desorption (deintercalation).
[6]
The secondary battery has a number of problems that threaten the internal short circuit, overcharging, safety of the secondary battery, such as heating and resulting electrolyte decomposition, thermal runaway due to over-discharge due to an external impact. In particular, the explosion of the secondary battery resulting from various causes, but is the cause of a secondary battery is also increased gas pressure within the electrolyte in accordance with decomposition. More specifically, when charging and discharging the secondary battery is repeatedly gas is generated by electrochemical reaction caused by the electrolyte and the electrode active material. At this time, the generated gas causes a problem such as by increasing the internal pressure of the secondary battery of weakening between the fastening part, the outer case of the secondary cell damage, premature operation of the protection circuit, the deformation of the electrode, an internal short circuit or explosion.
[7]
For such a battery block over-current through the control of electronic components for the secure event of overcharging and safety conditions (Safety event) battery to inhibit the overcharge condition. As a method of these methods is applied to a battery protection circuit and the like are exemplified, such as PCM (Protection Circuit Module). However, there was a disadvantage that even if the overcharge protection circuit such as a PCM was applied to the hard and become safety is sufficiently secured, especially a pouch-type battery is required than enhanced protection circuit structure is applied to determine more accurately the swelling of the pouch cell.
[8]
Further, in consideration of the malfunction situation of the electronic component using the pressure of the battery is the thermal expansion occurs during overcharge is applied to the mechanical current blocking device that blocks the serial connection of the battery physically. In general, the current interruption device of the battery pack has been widely used a method for using the battery pack Enclosures cut off the serial connection of the battery pack is physically cut off the current using only the inflation pressure of the battery resulting from overcharge conditions. However, it is not shown the sealing layer bar that can break the current to the volume expansion of the pouch-shaped battery parameters.
[9]
Korea Patent No. 1601135 No. In the lead in the coupling between the two lead plate of the pouch type secondary battery - If the internal pressure constant level or more due to the gas generated in the configuration, the secondary battery inside for inserting the polymer material across the lead gas the configuration of the venting notches that can be quickly discharged to the outside, the inserted between the lead plate 1,2 sealant first and second sealant is inserted between the configuration and lead plate having the characteristics insulating property and thermal fusion castle electricity than through is disclosed a configuration in which the insulating characteristics and heat-sealing the castle electricity non-conductive. However, the conductive polymer electrode lead-tab configuration and inserted between the electrode lead-lead or lead-lead or lead-can not identify a structure notched portions are formed in the film surrounding the bond tabs.
[10]
In Korea Laid-Open Patent Publication No. 2016-0125920 arc between an electrode assembly; And the pouch exterior is composed of a first pouch and the second pouch accommodating the electrode assembly, and are adhered to each other by the first pouch portion and the second portion of the second pouch portion respectively sealing; a pouch type secondary battery including a in, and extends from the electrode assembly, the first electrode lead are formed are attached to the first pouch portion; The second is attached to the pouch portion, the second electrode lead is formed to protrude to the outside of the pouch exterior; A first sealing member formed to be interposed between the first electrode lead and second electrode lead in order to prevent the first electrode lead and the second lead electrode in contact with each other; And the first electrode lead and the second film-like connection member for electrically connecting the electrode lead; is a pouch type secondary battery comprising the more is disclosed. However, the sealing member is configured not boatman conductivity may differ from the present invention.
[11]
Korea Patent Application No. 1192077 call the electrically to the first electrode and the second electrode and the first electrode and the case and the first electrode is an electrode assembly and the electrode assembly including a separator which is located between the second electrode receiving extending from the inner electrode terminal and the case is connected to the outside of the case, via the electrode terminal comprises a lead tab electrically connected to the first electrode, the lead tab is that the lead tab in contact with the casing in a state that is formed such that at least isolated from the part of the electrode terminal so that the electrical connection isolated from the first electrode in the case where the casing is modified, further comprising an adhesive member for bonding the lead tab to the electrode terminal, wherein the binding material is provided with a through-hole, the lead tab and the electrode electric terminal via the through-hole Being formed so as to be connected to, it discloses a secondary battery according to claim. However, the insulating polymer and the electrode lead-lead or lead-in is configured to be inserted between the tab there is a difference between the present invention and.
[12]
Korea Patent Application No. 1447064 arc in a cathode / separator / the cathode structure, the electrode assembly has a battery cell incorporated in the housing of the battery case, each electrode plate, that is not the active material is coated tab constituting the electrode assembly (electrode tab) and protrudes, said electrode and taps is one side end portion, and an electrode lead is positioned to electrically connect the electrode tabs with stack, the electrical connecting portion of the electrode taps and the electrode leads, the electrode lead by the deformation the battery cells, characterized in that forms a physical bond introduced into the electrode taps are disclosed. However, the conductive polymer of the electrode lead-tab configuration and inserted between the electrode lead-lead or lead-lead or lead-in can not determine the notch portion is formed configured to the film surrounding the bond tabs.
[13]
Thus, the electrode using a conductive polymer, comprising a step of short-circuiting the secondary battery as a medium for the pressure increase and the volume expansion of the pouch-shaped battery according to the gas generator, such as an abnormal condition, such as gas generation due to the abnormality of charging or battery-operated lead rechargeable battery technologies, including bar is not shown.
Detailed Description of the Invention
SUMMARY
[14]
The main object of the present invention for solving the conventional problems as described above in order to maintain the battery safety according to the volume expansion or excessive charging, such as swelling due to gas generated in unsteady state of a pouch-shaped battery cell, an adhesive layer made of a conductive polymer to provide a pouch type secondary battery including an electrode lead, and this for safety shorting the electrode lead is coupled to the object.
[15]
Further, to provide a simple short-circuit forming section and the pouch-shaped secondary battery including the same that can maintain the energy density of the battery cell, the battery cell is not a complicated additional device that can break the current in an abnormal state such as the volume expansion of the can is a further object.
Problem solving means
[16]
The present invention been made in view of solving the conventional problems as described above, accommodated in the pouch case comprising a positive electrode and that is a negative electrode are laminated electrode assembly, the electrode tab, the electrode leads and the sealing layer in the separation membrane is sandwiched state pouch type in the secondary battery, one end is connected to the electrode assembly, a first electrode lead extending from the junction of the other end of the pouch case; And wherein the first electrode lead and detachably connected to the second electrode lead extending exposed to the outside of the pouch case; Connection layer bonded between the first electrode lead and the second lead electrode; And it is possible to provide a pouch type secondary battery including a sealing layer bonded to the electrode leads and the pouch case.
[17]
Also, the connection layer may be weakly bonded than the sealing layer.
[18]
Further, the sealing layer may be formed to surround a part of the connecting layer is coupled to the electrode lead.
[19]
Further, the sealing layer is formed with a notch in one end of the notch may be formed in the portion where the sealing layer and the electrode lead do not overlap.
[20]
In addition, the boundary surface of the notch can have any one or more types of linear, triangular, square, or polygonal.
[21]
Further, the width (LL) of the width (LT) of the sealing layer and the electrode lead may be LT = LL.
[22]
Also, the connection layer can be a conductive polymer.
[23]
Further, the sealing layer may be made of a thermoplastic, thermosetting, photo-which at least one resin of the photosetting resin having an electrical insulating property.
[24]
The thickness of the connection layer may be 1 to 500 ㎛.
[25]
Further, the sealing layer is a first sealing layer residing between the pouch case adjacent thereto and the first electrode lead, blocking the outside and the electrode assembly in the pouch case; It may include a; and the second sealing layer that is present between the pouch case adjacent thereto and the second electrode lead, and the block outside the electrode assembly of the pouch case.
[26]
In addition, non-(CL / LL) of the connecting layer length (CL) and the electrode lead width (LL) may be 1 or less than 0.01.
[27]
In addition, it may be a device comprising a pouch type secondary battery.
[28]
In addition, the device may be selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.
Brief Description of the Drawings
[29]
1 is a view showing an exemplary conventional pouch-shaped battery cell.
[30]
Figure 2 is a diagram an exemplary pouch-shaped battery cell, showing the volume expansion caused by gas.
[31]
Figure 3 is a pouch type secondary battery short circuit before and after drawing the connecting layer and the sealing layer in accordance with one embodiment of the present invention is formed.
[32]
Figure 4 is a longitudinal perspective diagram of the short-circuit electrode lead portion pouch type secondary battery connecting layer and the sealing layer is formed in accordance with one embodiment of the present invention.
[33]
5 is a view of the sealing layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[34]
Figure 6 is a view of cutting the sealing layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[35]
7 is a diagram of the notch seal layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[36]
Figure 8 is a curvature radius and an angle of the sealing layer drawings notch formed in the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[37]
Figure 9 is a two-stage compression and electrode lead CID (Pressurizable) cell shape in accordance with one embodiment of the present invention.
[38]
Figure 10 is a two-stage electrode lead CID experiments set picture according to an embodiment of the present invention.
[39]
Figure 11 is a two-stage electrode lead CID experiments, according to one embodiment of the present invention.
Best Mode for Carrying Out the Invention
[40]
Reference to the accompanying drawings self having ordinary skill in the art will be described in detail an embodiment that can easily practice the invention. However, if it is determined that in the following description of the detail of the operation principle of a preferred embodiment of the present invention is a detailed description of known functions or constructions may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.
[41]
In addition, the same reference numerals to portions that a similar function and operation throughout the drawings. In the specification, when there is any part connected to the other part, which, as well as if it is directly connected to, placed between the other elements in between, and includes cases that are indirectly connected. Also, it includes a certain component, not excluding the other elements do not have a base material which is particularly opposite, it means that may further contain other components.
[42]
According to the invention in the drawings will be described as in the detailed embodiment.
[43]
1 is a view showing an exemplary conventional pouch-shaped battery cell.
[44]
In as general a lithium secondary battery, first, by applying the material a mixture of active material and a binder, and a plasticizer in the positive electrode collector and the negative electrode current collector to prepare a positive electrode plate and negative electrode plate, and laminating it on both sides of a separator battery cells having a predetermined shape the formation of the next, inserting the battery cell in a battery case and takes the process to complete the battery pack by sealing after injecting the electrolyte.
[45]
A typical structure of the electrode assembly (electrode assembly) electrode leads (electrode lead) that is connected to has one end connected to the electrode assembly and exposed to the outside of the battery case (battery case) the other end, to the periphery of the electrode assembly a battery case that surrounds to exist has a structure of the electrode lead is sealed by the adhesive layer by the sealant at the portion where the electrode lead extending to the outside of the battery case.
[46]
In addition, the electrode assembly is provided with an electrode tab. Collecting plate of the electrode assembly is composed of the electrode terminal portion (hereinafter referred to as "solid portions" La abbreviated) the active material is not a coated portion and an electrode active material is applied, the electrode tab is formed by parts of solid cut, or ultrasound to uncoated portion may be separate conductive members were connected by welding or the like. Electrode tab may be protruding in one direction to face each other to form side-by-side in the electrode assembly, as shown, may be projected in a two-way or multi-directional.
[47]
Electrode tab that acts as the movement of cells within and outside the electronic path, the electrode lead is connected to the electrode tabs and the like of spot welding. Electrode lead may extend in the same direction with each other according to the positions of formation of the positive electrode tab and the negative electrode tab, and may extend in opposite directions. Positive electrode lead and negative electrode lead is a material that may be different from each other. That is, the positive electrode lead is the same aluminum (Al) material and the positive electrode plate, a negative electrode lead may be the same copper (Cu) material or a nickel (Ni) with the coated copper material and the negative electrode plate. Finally, the electrode leads are electrically connected to the external terminal via a terminal portion.
[48]
The pouch exterior is sealed to accommodate the electrode assembly such that a part of the electrode lead, that the terminal is exposed. The sealants such as described above between the electrode leads and the pouch exterior is interposed sealing layer. The pouch exterior includes a sealing area to the border, and the horizontal slit of the electrode leads are spaced from the junction towards the sealing area. That is, when the electrode lead and an inverted T-shape, the leg's T protrudes outside the pouch exterior is formed in the head part of the sealing part's T domain.
[49]
Usually the anode current collector plate to the aluminum material, the negative electrode current collector plate as is to use a copper material, swelling phenomenon occurs because there is a tendency that the copper foil instead of aluminum foil easier to rupture, the rupture probability of the negative electrode lead is higher than the positive electrode lead can. In such a case, it may be desirable to form the negative electrode lead in this electrode breakage can lead
[50]
In the normal state of the secondary battery, and by the sealing layer the electrode assembly is isolated from the outside, excessive charging, internal cell pressure by a cause such as a high temperature rise is though to be the expansion of the cell can induce only cell case a weak portion or other of a weak bonding portion of the component is ruptured will be the exhaust gas in the battery.
[51]
However, the current from the battery as long as the electrode assembly and the electrode leads are electrically connected to, the current continues to flow because the still very difficult to ensure the stability of the battery. In order to solve such a problem, but a method for adjusting the amount of the electrolyte to be injected into the secondary battery or adjust the short-circuit pressure or a current cut-off member (CID) is used that there is a problem of lowering the stability of the excessive charging when the battery. That is, to address the use of stability with the use of the battery in the safety and high-temperature environment of excessive charging when the battery is not at the same time reasonable for.
[52]
(Comparative)
[53]
Figure 2 is a diagram an exemplary pouch-shaped battery cell, showing the volume expansion caused by gas.
[54]
파우치는 가스 배리어층(gas barrier layer)과 실란트층(sealant layer)을 포함한다. 그리고 가스 배리어층 상에 형성된 최외층으로서 표면 보호층을 더 포함하기도 한다. 상기 가스 배리어층은 가스 출입을 차단하기 위한 것으로서, 이는 주로 알루미늄 박막(Al foil)이 사용된다. 상기 실란트층은 최내층에 위치하여 내용물, 즉 셀과 접촉된다. 그리고 상기 표면 보호층은 내마모성 및 내열성 등을 고려하여 주로 나일론(Nylon) 수지가 사용된다. 상기 파우치는 위와 같은 적층 구조의 필름이 주머니 형태로 가공되어 제조되며 양극, 음극 및 세퍼레이터(separator) 등의 셀 구성 요소가 전해액에 함침된 다음 내장된다. 이와 같이 셀 구성 요소가 내장된 다음, 파우치의 입구에서 실란트층끼리 열접착되어 실링된다. 이때, 실란트층은 셀 구성 요소와 접촉되므로 절연성과 함께 내전해액성 등을 가져야 하며, 또한 외부와의 밀폐를 위해 높은 실링성을 가져야 한다. 즉, 실란트층끼리 열접착된 실링 부위는 우수한 열접착 강도를 가져야 한다. 일반적으로, 실란트층은 폴리프로필렌(PP) 또는 폴리에틸렌(PE) 등의 폴리올레핀계 수지가 사용된다. 특히, 폴리프로필렌(PP)은 인장강도, 강성, 표면경도, 내충격 강도 등의 기계적 물성과 내전해액성 등이 뛰어나 파우치의 실란트층으로 주로 사용되고 있다.
[55]
However, the pouch-shaped secondary battery according to the related art has a problem that the stability of the explosive. In general, generating electricity in the cells / discharge (charging / discharging) process to in (a redox reaction) caused by heat and pressure, at this time may experience high heat and pressure, for reasons such as overcharge or short circuit due to adverse events within the cell to have. May explode in this high heat and pressure, the conventional pouch-shaped secondary battery failure to find a technological means capable of preventing the explosion risk as above, there is a problem that is exposed to the explosion hazard.
[56]
(Example 1)
[57]
Figure 3 is a pouch type secondary battery short circuit before and after drawing the connecting layer and the sealing layer in accordance with one embodiment of the present invention is formed.
[58]
Figure 4 is a longitudinal perspective diagram of the short-circuit electrode lead portion pouch type secondary battery connecting layer and the sealing layer is formed in accordance with one embodiment of the present invention.
[59]
The pouch type secondary battery may further include a sealing layer. The sealing layer is that, while sealing is attached to a predetermined position where the electrode tabs and pouch contact the insulation between the pouch and the electrode tabs. The pouch is so relatively high as the pressure in the portion in contact with the electrode tab in the sealing process, the pouch film Cas suited polypropylene; increases the likelihood of damage to the layer (Casted Polypropylene CPP). Thus, to time, of the sealing layer the inner layer is kept electrically insulating property and mechanical strength and to impart heat resistance to maintain the shape of the sealing layer a pouch and an electrode tab, the pouch is sealed at the heat and pressure conditions to be sealed. In particular, the inner layer of the sealing layer is an aluminum thin film, even if the pouch is partially exposed from the sealing process, to prevent the contact with the electrode tabs and the electrical insulating properties are maintained. The outer layer of the sealing layer is modified in some form even if the heat and pressure conditions allows to maintain the seal by applying the adhesion between the pouch and the electrode tabs. Thus, it cas suited polypropylene of the pouch by heat and pressure in the sealing process of the pouch; is a layer (Casted Polypropylene CPP) strain even if the aluminum thin film is partially exposed is possible to maintain the sealing.
[60]
The first electrode lead may be the first negative electrode lead or the first anode lead.
[61]
The second electrode lead may be a second negative electrode lead or the second lead anode.
[62]
The first is the negative lead connected to the negative electrode tab of FIG. The connection may be made by the method on the one member selected from the group consisting of ultrasonic welding, resistance welding and laser welding.
[63]
The first negative electrode lead and the negative electrode lead 2 are connected by the connection layer.
[64]
Also, the connection layer can be a conductive polymer.
[65]
The conductive polymer may include a conductive material.
[66]
The conductive material is graphite such as natural graphite or artificial graphite; Carbon black, acetylene black, Ketjen black, channel
[67]
Black, furnace black, lamp black, carbon black and thermal black; Conductive fibers such as carbon fibers and metallic fibers; Metal such as carbon fluoride, aluminum, nickel, gold, silver, copper powder powder; Or a powder that has a core / shell structure with a metal coating of a heterogeneous metal over the first species; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Poly-conductive material such as phenylene derivative may be used by mixing one or more. The polymer is an acrylic resin of a thermosetting polymer resin, epoxy resin, EPDM (Ethylene Propylene Diene Monomer) resin, CPE (Chlorinated Polyethylene) resin, silicone, polyurethane, urea resin, melamine resin, phenol resin and unsaturated polyester resin, PP (polypropylene ), PE (polyethylene), it is preferred and most preferred that the acrylic resin containing at least any one or more of polyimide, polyamide.
[68]
The thickness of the connecting layer is preferably in the range of 1 to 500 ㎛, more preferably from 15 to 300 ㎛. This is because it can adversely affect the performance of normal conduction, heat radiation performance and energy density, if the thickness of the connection layer is outside the above range.
[69]
Surrounding the first anode lead and a second lead connected to the cathode connection layer can be a sealing layer formed of a shape. The sealing layer may be strongly bonded than the connection layer and the other surface does not contact with the first negative electrode lead and the negative electrode lead 2 may be combined with the pouch.
[70]
The sealing layer may be strongly bonded to the second and the negative electrode lead and negative electrode lead pouch of claim 1.
[71]
Thus, while the pouch is relatively weakly bonded layers are separated by a combination with the time of the expansion gas is generated and the internal pressure is increased due to the abnormal condition of the secondary battery, thereby short-circuiting the first negative electrode lead and the second negative electrode lead.
[72]
The short-circuit may occur in the cut formed in the first sealing layer. By being bonded structure is changed due to expansion from the cut of the sealing layers is weak bonding force the notch portion can be started is released.
[73]
4 is a view before and after the short-circuit electrode lead part of the pouch type secondary battery having a connection layer and a sealing layer, according to one embodiment of the present invention.
[74]
Looking at the short-circuit of the electrode lead-in time series, first, the pouch is inflated by a gas generator, and the internal pressure increased due to the abnormal condition of the secondary battery, a sealing layer that is strongly bonded to the pouch is deformed according to expansion of the pouch , the time to fall from a relatively weak bond is notched electrode lead may also be modified with this. As the last separation relative to the first electrode lead and into the electrode leads of the connection layer is a surface that was weakly coupled to the second electrode lead is to be short is in progress.
[75]
(Example 2)
[76]
5 is a view of the sealing layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[77]
A sealing layer surrounding the first anode lead and a second negative electrode lead connected to the connecting layer formed of a shape can be formed in various forms and may take the form of a conventional insulating tape, a notch so that one end matches that of the electrode lead width there may be formed (128). Only either one of the both ends of the sealing layer may also be a notch form. From this, a notch is formed may function less force for separation of the connection layer and the electrode leads of the abnormal condition.
[78]
Further, the width (LL) of the width (LT) of the sealing layer and the electrode lead may be LT = LL.
[79]
(Example 3)
[80]
Figure 6 is a view of cutting the sealing layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[81]
A sealing layer surrounding the first anode lead and a second negative electrode lead connected to the connecting layer formed of a shape can be formed in various forms and may take the form of a conventional insulating tape, store a first negative electrode lead and the second negative electrode lead the cutting ratio (Lc / LB) of cutting the sealing layer (Lc) and the sealing layer length (LB) formed of the junction overlap may be less than or equal to 0 to 0.5.
[82]
If the range of the cutting ratio is too small, the pouch may not lead to a short circuit safety conditions such as internal pressure increases, it is possible to lead the short-circuit occurs in the normal state the cutting ratio is too large.
[83]
(Example 4)
[84]
7 is a diagram of the notch seal layer formed on the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[85]
The interface of the notch can have any one or more aspects of the triangle, square, or polygonal. When from this type of pouch is inflated by a gas generator, and the internal pressure increased due to the abnormal condition of the secondary battery may take less jegeoryeok notch portion of the sealing layer to be relatively weakly bound, the binding layer is separated.
[86]
Further, the sealing layer may be made of any one or two or more of thermoplastic resin, thermosetting, photo-curing resin having an electrical insulating property.
[87]
The polymer resin is a thermoplastic, thermosetting, photo-curing resin having an electrical insulating property, and examples include a styrene-butadiene resin, styrene resin, epoxy resin, urethane resin, acrylic resin, phenol resin, amide resin, an acrylate-based resin, and you can select one of the modified resin, and may be used by mixing two or more kinds, if necessary. Wherein the polymer resin of the thermoplastic resin is an elastomer matrix, which serves to support the film formation, and the softening point is preferably from about 100 ~ ~ 250 ℃, it can be used in 10 ~ 90% by volume of the total parts of the polymeric resin.
[88]
Wherein the polymeric resin is an acrylic resin, an epoxy resin of a thermosetting polymer resin, EPDM (Ethylene Propylene Diene Monomer) resin, CPE (Chlorinated Polyethylene) resin, silicone, polyurethane, urea resin, melamine resin, phenol resin, unsaturated polyester, PP (polypropylene ), it includes a PE (polyethylene), polyimide, at least any one or more of polyamide resin.
[89]
It is most preferred to use an acrylic resin of a thermosetting polymer resin.
[90]
The thickness of the sealing layer may be a 10 to 500 ㎛, may be preferably from 15 to 300 ㎛. It can not maintain the normal insulation thickness is out of the range.
[91]
(Example 5)
[92]
Figure 8 is a curvature radius and an angle of the sealing layer drawings notch formed in the electrode leads of the pouch type secondary battery according to an embodiment of the present invention.
[93]
The radius of curvature (R) of the notch should not be more than 0.5mm. Preferably 0.2㎜ 10㎛ below, may be more preferably not more than 0.1㎛ 0.05㎜. Outside the above range, the electrode lead from the safety state in case of short circuit of the notch can not be induced by the internal pressure rise.
[94]
The angle forming the notch (A) may also be less than 180 degrees, greater than 0. Preferably it may be 90 degrees or more than 120 degrees, can be less than even more preferably at least 45 90.
[95]
Outside the above range, the electrode lead from the safety state in case of short circuit of the notch can not be induced by the internal pressure rise.
[96]
When from this type of pouch is inflated by a gas generator, and the internal pressure increased due to the abnormal condition of the secondary battery may take less jegeoryeok notch portion of the sealing layer to be relatively weakly bound, the binding layer is separated.
[97]
The positive electrode active material is lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium-cobalt-nickel oxide, lithium-cobalt-manganese oxide, lithium manganese-nickel oxide, lithium-cobalt-nickel-manganese oxide, lithium iron phosphate acid oxide of olivine structure , the lithium manganese oxide of spinel structure, and the other of these element (s) can use any one or two or more lithium-containing metal oxide selected from the group consisting of substituted or doped oxide. Here, the other elements may be one or two or more elements selected from the group consisting of Al, Mg, Mn, Ni, Co, Cr, V and Fe.
[98]
The negative electrode active material is lithium metal, lithium alloys (e.g., alloys of metals and the like of lithium with aluminum, zinc, bismuth, cadmium, antimony, silicon, lead, tin, gallium or indium), amorphous carbon, crystalline carbon, carbon composite material, available SnO2, etc., but is not limited thereto.
[99]
In addition, it may be a device comprising a pouch type secondary battery.
[100]
In addition, the device may be selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.
[101]
(Example)
[102]
The embodiment of the first electrode lead and second end lead CID operation applying a second electrode lead-test implemented in the results can be found at 9 to 11.
[103]
Figure 9 is a compression cell in order to implement the operation test of the pressure-resistant lid CID was produced in two stages. Shape of the compression cell according to the sealing layer of the film cutting the lead (Lead film cutting, Lc) conditions was prepared as in (a), (b), (c), (d).
[104]
10 is an experimental setting picture for identifying a two-stage read CID operating pressure.
[105]
To derive the security developer according to the internal pressure increase of the cell (a), to check the air inlet and the second-stage lead junction, (b) the second stage can be confirmed pouch portion lead CID junction minutes pouch lead film sealing portion.
[106]
Figure 11 shows the results of experiments according to a two-stage read CID operation of the electrode lead film amount of the side surface operation check result of metal adhesion to the electrode lead film cutting conditions (a), (b), (c), (d) .
[107]
전극리드의 외각 부분에서 셀의 내압 상승에 따라 파단이 진행된 것으로 확인된다. 연결리드의 리드 필름이 내압 상승에 따라 먼저 찢어지면서 전극리드의 CID를 작동하게 하는 것을 확인할 수 있다. 또한 상기 전극리드 필름 커팅 조건은 0mm, 1mm, 3mm 및 5mm 의 모든 조건에서 2단 전극리드 작동을 확인하였다.
[108]
이상에서 본 발명은 기재된 실시예를 참조하여 상세히 설명되었으나, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 상기에 서 설명된 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 부가 및 변형이 가능할 것임은 당연한 것으로, 이와 같은 변형된 실시 형태들 역시 아래에 첨부한 특허청구범위에 의하여 정하여지는 본 발명의 보호 범위에 속하는 것으로 이해되어야 할 것이다.
[109]
(부호의 설명)
[110]
100 : 전지셀
[111]
110 : 상부파우치
[112]
120 : 전극조립체
[113]
120a : 음극
[114]
120b : 양극
[115]
120c : 분리막
[116]
121 : 양극탭
[117]
122 : 음극탭
[118]
123 : 절연테이프
[119]
124: positive electrode lead
[120]
125: negative electrode lead
[121]
125a: first anode lead
[122]
125b: second anode lead
[123]
126: Link Layer
[124]
127: sealing layer
[125]
128: Notch
[126]
130: lower pouch
Industrial Applicability
[127]
According to the pouch type secondary battery including the electrode leads using the conductive polymer according to the present invention, there is an effect in an abnormal state that can prevent the current flowing in the pouch type secondary battery such as overcharge.
[128]
In addition, the present invention if to proceed for more complex device with a pouch-type secondary battery, reduce the receiving space of the current collector in a pouch there is an effect that it is possible to preclude that the energy density decreases.
[129]
In addition, the present invention has an effect capable of cutting the electrode lead to mediate the gas expansion of the pouch type secondary battery.

WE Claims

[Claim 1]
In the pouch type secondary battery accommodated in the pouch case comprising a positive electrode and that is a negative electrode are laminated electrode assembly, the electrode tab, the electrode leads and the sealing layer in the separation membrane is sandwiched state, one end is connected to the electrode assembly, the other end is the a first electrode lead extending from the junction of the pouch case; And wherein the first electrode lead and detachably connected to the second electrode lead extending exposed to the outside of the pouch case; Connection layer bonded between the first electrode lead and the second lead electrode; And a pouch type secondary battery including a sealing layer bonded to the electrode leads and the pouch case.
[Claim 2]
The method of claim 1, wherein the connection layer is a pouch-shaped secondary battery, characterized in that it is weaker than the bonding of the sealing layer.
[Claim 3]
The method of claim 1, wherein the sealing layer is a pouch-shaped secondary battery, characterized in that is formed to surround a part of the connecting layer is coupled to the electrode lead.
[Claim 4]
The method of claim 3, wherein the sealing layer is that once the notch is formed in the notch is a pouch-shaped secondary battery, characterized in that formed at the portion where the sealing layer and the electrode lead do not overlap.
[Claim 5]
The method of claim 4, wherein the boundary surface of the notch is linear, triangular, square, or any pouch type secondary battery comprising the at least one form of the polygon.
[Claim 6]
The method of claim 1, wherein the sealing layer width (LT) and the electrode lead width (LL) is LT = LL the pouch type secondary battery according to claim.
[Claim 7]
The method of claim 1, wherein the connection layer is a pouch-shaped secondary battery, characterized in that the conductive polymer.
[Claim 8]
The method of claim 1, wherein the sealing layer is electrically insulating having a thermoplastic, thermosetting, photo-curing resin which pouch type secondary battery, characterized in that of one or more of the resin.
[Claim 9]
The method of claim 1, wherein the thickness of the connection layer is 1 to 500 ㎛ the pouch type secondary battery according to claim.
[Claim 10]
The method of claim 1, wherein the seal layer has a first sealing layer residing between the pouch case adjacent thereto and the first electrode lead, blocking the outside and the electrode assembly in the pouch case; And the second electrode residing between the pouch case to the lead and adjacent to the second sealing layer to block the exterior and the electrode assembly in the pouch case; pouch-type secondary battery, comprising a step of including.
[Claim 11]
The method of claim 1, wherein the ratio (CL / LL) of the connecting layer length (CL) and the width of the lead electrode (LL) of the pouch type secondary battery according to claim 1 or less than 0.01.
[Claim 12]
Claim, the device characterized in that it comprises the pouch type secondary battery according to any one of claims 1 to 11.
[Claim 13]
13. The method of claim 12, wherein the device is a device wherein is selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.