Mutual citations and related applications
[2]
This application claims the benefit of priority based on Patent Application No. 10-2017-0157526 Korea dated 23 November 2017, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[3]
Art
[4]
The present invention is a pouch-shaped as a secondary battery, more particularly to a pouch type is the internal pressure of the battery case, the electrode lead is detachable from each other in the second stage the user can easily adjusted, remains constant when said internal pressure control It relates to a secondary battery.
BACKGROUND
[5]
To generate electrical energy through a physical reaction or chemical reaction of the material cell (Cell, Battery) that supply power to the outside, according to the living environment and surrounded by a variety of electronic apparatuses, does not obtain the AC power supplied to the building, or If the DC power required is used.
[6]
In such cells there from chemical reaction cell of a primary cell and a secondary battery using a commonly widely used, the primary cell is a consumable battery to be collectively referred to as batteries. On the other hand, the secondary battery is a rechargeable battery that is prepared by the oxidizing and reducing process between the current and the material used a number repeatable material. 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 E-bike, etc. of small products, as well as development of large products and surplus that high power is required, such as electric cars or hybrid cars It is applied to the electric power storage device and the back-up power storage for storing power and renewable energy have been used.
[7]
The lithium secondary battery is generally cathode (Cathode), a separator (Separator) and the negative electrode (Anode) is formed is stacked. And their material is selected in consideration of the battery life, charge and discharge capacity, temperature characteristics and stability. As the lithium ions are inserted (Intercalation) and desorption (Deintercalation) process in which the graphite of the negative electrode repeatedly from the lithium metal oxide of the positive electrode, the charging and discharging of the lithium secondary cell proceeds.
[8]
Together they are generally laminated in a positive electrode / separator / three-layer structure of the cathode, or anode / separator / anode / separator / cathode or anode / separator / cathode / separator / five-layer structure of the negative electrode unit cells, is one of the electrode assembly . And the electrode assembly is received in a particular case.
[9]
This secondary battery according to the material of the case for accommodating the electrode assembly, it is classified as such a pouch type (Pouch Type) and the can-type (Can Type). The pouch type (Pouch Type) accommodates an electrode assembly in a pouch made of a polymer material in the form of non-uniform ductility. Then, the can-type (Can Type) accommodates an electrode assembly in the case the shape is made of a material such as certain plastics or metal.
[10]
On the other hand, the secondary battery is subjected to safety threat to various problems such as internal short circuit due to external impact, excessive charging, the electrolyte and consequent heat generation due to over-discharge decomposition, thermal runaway. 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.
[11]
More specifically, when charging and discharging the secondary battery repeatedly, the gas is generated by electrochemical reaction caused by the electrolyte and the electrode active material. At this time, the generated gas will cause problems, such as by increasing the internal pressure of the secondary battery weakened binding force between the parts, the case damage to the secondary battery, the early operation of the protection circuit, the deformation of the electrode, an internal short circuit or explosion. Accordingly, in the case of the secondary battery of the can-type (Can Type) it is, provided with a protective member, such as a CID filter and a safety vent, and to block the electrical connection when the internal pressure of the housing increases as the physical. However, in the case of a secondary battery of the conventional pouch-shaped (Pouch Type) has, this protection member was not sufficiently provided.
[12]
Recently, the pouch-shaped plurality of forming the electrode lead to the second stage, the case is expanded when a plurality of electrode leads are techniques that are detachable from each other to block the electrical connection, such as to block the connection is physically in the secondary battery of (Pouch Type) have been proposed It was. However, conventionally, it could not adjust the internal pressure of the battery case in which the plurality of electrode lead removal. That is, even if the same internal pressure increase in the secondary battery of the same model, without the internal pressure constant current is cut off, not it also easy for a user to control, a problem that can not be always uniformly secured the reliability of the safety there was.
Detailed Description of the Invention
SUMMARY
[13]
Object of the present invention, and the electrode leads of the second stage the user can easily adjust the internal pressure of the battery case which is detachable from each other, to provide a pouch-type secondary battery to be constant if the inner pressure adjustment .
[14]
An object of the present invention are not limited to the problem mentioned above, another problem that is not mentioned will be understood clearly to those skilled in the art from the following description.
Problem solving means
[15]
The pouch type secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked, including the positive and negative electrodes in accordance with an embodiment of the present invention for solving the above problems; A battery case accommodating the electrode assembly; An electrode tab is connected to the electrode which protrudes from one side of the electrode assembly; A first electrode lead having one end connected to the electrode tab; Once the connection and the other end of the first electrode lead and second electrode lead which is the other end protruding to the outside of the battery case; Connection to interconnect the first and second electrode leads; It said first and said insulating portion to surround the portion of the second electrode lead, and is fused, bonding the first and second electrode leads to the battery case; And is formed in a specific location on the surface of the first electrode lead includes fusion prevention portion for preventing the fusion between the first electrode lead and the insulating portion.
[16]
In addition, the anti-fusing portion, from one side of the connecting portion can be formed the inside of the battery case in a direction toward.
[17]
In addition, the fusion preventing portion may be formed by performing an abrasion processing on the particular location.
[18]
In addition, the fusion preventing portion may be formed by performing a surface treatment to the non-specific location.
[19]
In addition, the fusion preventing portion may be formed by attaching a first tape to the specific location and the separation of the first tape after performing the surface treatment.
[20]
In addition, the insulating portion may include a polyolefin-based resin acid treatment.
[21]
Further, the polyolefin-based resin may include polypropylene.
[22]
In addition, the fusion preventing portion may be formed by attaching a second tape to the specific position.
[23]
Also, the second tape may include a normal polypropylene non-acid treated.
[24]
In addition, the fusion preventing portion may be formed by a film attached to the position of the insulating part corresponding to the specific position.
[25]
Further, the film may comprise a normal polypropylene non-acid treated.
[26]
In addition, the adhesive strength between the first specific position or the insulating portion and the fusion preventing part of the first electrode lead, can weaker than the adhesive force between the first or second electrode lead and the connecting portion.
[27]
Further, the connection portion, may be made of a conductive polymer comprising a conductive material.
[28]
Further, the link portion may be a thickness of 1 to 500 μm.
[29]
In addition, the insulating portion, and the first and second electrode leads are connected to surround the portion through said connecting portion.
[30]
More specific details of the invention are included in the following description and drawings.
Effects of the Invention
[31]
According to embodiments of the present invention has at least the following effects.
[32]
First and parts of anti-fuse formed in a specific location on the surface of the first electrode lead, by adjusting the length fusion preventing portion, the first and can adjust the internal pressure at which the second electrode lead is detachable, remains constant when said internal pressure control It can be.
[33]
Effect according to the present invention is not limited by the details illustrated in the above, and is more diverse effects are included in the present specification.
Brief Description of the Drawings
[34]
1 is an assembly view of the pouch type secondary battery according to an embodiment of the present invention.
[35]
2 is a perspective view of the appearance of the assembly is completed, the pouch type secondary battery of FIG.
[36]
3 is a cross-sectional view of a battery case according to an embodiment of the present invention.
[37]
Figure 4 is a perspective view showing a state that the volume of the pouch type secondary battery according to one embodiment of the invention the expansion.
[38]
Figure 5 is a part of a cross-sectional view taken of a conventional pouch-shaped secondary battery including a plurality of electrode leads also to the A-A 'of FIG.
[39]
Figure 6 is a part of a cross-sectional view taken in line A-A 'of Figure 2 when the volume of the conventional pouch-shaped secondary cell expansion comprising a plurality of electrode leads.
[40]
Figure 7 is a part of a cross-sectional view taken in line A-A 'of Figure 2 the pouch type secondary battery according to an embodiment of the present invention.
[41]
Figure 8 is a part of a cross-sectional view taken in line A-A 'of Figure 2 when the volume of the pouch type secondary battery according to one embodiment of the invention the expansion.
[42]
Figure 9 is an enlarged close-up of the first electrode lead and second electrode lead and the connecting portion according to one embodiment of the invention shown in Fig.
[43]
Figure 10 is an enlarged close-up of the first electrode lead and second electrode lead and the connecting portion according to one embodiment of the invention shown in Fig.
[44]
Figure 11 is an enlarged close-up of the first electrode lead and second electrode lead and the connecting portion according to another embodiment of the present invention corresponding to Fig.
[45]
Figure 12 is an enlarged close-up of the first electrode lead and second electrode lead and the connecting portion according to another embodiment of the present invention corresponding to Fig.
Mode for the Invention
[46]
Methods of accomplishing the advantages and features of the present invention and reference to the embodiments that are described later in detail in conjunction with the accompanying drawings will be apparent. However, the invention is not limited to the embodiments set forth herein may be embodied in many different forms, but the present embodiments, and the disclosure of the present invention to complete, and ordinary skill in the art is furnished the chair in order to fully convey the concept of the invention to have, the present invention will only be defined by the appended claims. Like reference numerals throughout the specification refer to like elements.
[47]
Unless otherwise defined, all terms used herein (including technical and scientific terms) could be used as a means that can be commonly understood by one of ordinary skill in the art to which this invention belongs. Another term that is defined in a general dictionary used are obviously not to be construed as ideal or excessively unless otherwise defined.
[48]
As used herein, the term is intended to illustrate the embodiments are not intended to limit the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the text. As used herein "(comprising) comprising," "it includes (comprises)" and / or do not preclude the presence or addition of one or more other components in addition to the components mentioned.
[49]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention;
[50]
1 is an assembly of the pouch type secondary battery 1 according to one embodiment of the invention, Figure 2 is a perspective view of the appearance of the assembly is completed, the pouch-shaped secondary cell 1 of FIG.
[51]
Process of generally manufacturing a lithium secondary battery is first applied to a mixture of the electrode active material and a binder and a plasticizer slurry on the positive electrode collector and the negative electrode current collector to prepare a positive electrode plate and negative electrode plate, by laminating it to a separator (Separator) and alternately inserted in the formation of the electrode assembly 10 having a predetermined shape, and then, the electrode assembly 10 into the battery case 13, and after sealing the electrolyte injection.
[52]
Electrode assembly (Electrode Assembly, 10) include an electrode tab (Electrode Tab, 11) as shown in Fig. An electrode tab 11 are respectively connected to the positive and negative electrodes of the electrode assembly 10, to protrude to the outside of the electrode assembly 10, is the path that the electron to move between the inside and the outside of the electrode assembly 10 . The collector of the electrode assembly 10 is composed of a terminal portion, that is, plain unpainted This electrode active material coated portion and an electrode active material. And the electrode tab 11 may be formed by connecting a separate conductive member formed by parts of solid foundation or a coated portion by ultrasonic welding or the like. The electrode tab 11 may be projected in the direction to each other, from one side of the electrode assembly 10, but may also be side-by-side protruding in the same direction, not limited to this, as shown in FIG.
[53]
An electrode tab 11, the electrode lead (Lead Electrode, 12) of the electrode assembly 10 is connected to the spot (Spot) welding or the like. Electrode lead 12 according to an embodiment of the present invention is formed from a plurality. And, in one of the plurality of electrode leads 12, the first electrode lead (1230, shown in Figure 5) is connected with the electrode tab 11 of the electrode assembly 10, a second electrode lead (1240, Fig. 5 shown) it is projected to the outside of the battery case (battery case, 13). Detailed description of the first and second electrode leads (1230, 1240) will be described later. Then, the part of the electrode lead 12 is surrounded by a surrounding insulating portion 14. Insulating portion 14 is limited to the sealing part is an upper pouch 131 and the pouch bottom 132 of the battery case 13 by heat-sealing position, it is attached to the battery case 13. And, it prevents the electricity generated from the electrode assembly 10 flows into the battery case 13 via the electrode lead 12, and maintains sealing of the battery case 13. Thus, such insulation portion 14 is made of non-conductive with a non-conducting electricity is impervious well. Roneun generally insulating portion 14, it facilitates attachment to the electrode lead 12, and one using a lot of relatively thin insulating tape is thick, there may be isolated a electrode lead 12 is not limited to be used for various members have.
[54]
Lead electrode 12 may extend in the same direction with each other according to the positions of formation of the positive electrode tab 111 and the negative electrode tab 112 and may extend in opposite directions. A cathode lead 121 and anode lead 122 is a material that may be different from each other. That is, the positive electrode lead 121 is the same aluminum (Al) material body and the positive electrode collector, a negative electrode lead 122 may be of the same copper (Cu) material or a nickel (Ni) with the coated copper material and the negative electrode collector. And a portion of the electrode lead 12 projecting to the outside of the battery case 13 is a terminal portion and is connected to the external terminal and electrically.
[55]
The pouch type secondary battery (1) the battery case 13 is in a pouch made of a flexible material. Or less, the battery case 13 is described to be a pouch. And the battery case 13 is accommodated in a portion, that is, the electrode assembly 10 so that the terminal portion is exposed in the electrode lead 12 and the sealing. And such battery case 13 comprises a pouch top 131 and the pouch bottom 132, as shown in FIG. The lower pouch 132 has a receiving space (1331) which can accommodate the electrode assembly 10 is provided, the upper pouch 131 is not to exit to the outside of the electrode assembly 10. The battery case 13 It covers the accommodating space 1331 at the top. At this time, also the accommodation space 1331 in the upper pouch 131. As shown in Figure 1 is formed, it is also possible to accommodate the electrode assembly 10 from the top.
[56]
Upper pouch 131 and the pouch bottom 132 may be variously produced, such as to be produced is a separated from each other, but can be manufactured separately, are connected to each other one side is not limited to this, as shown in FIG.
[57]
When the electrode lead 12 connected to the electrode tab 11 of the electrode assembly 10 is, formed on the insulation portion 14 on a portion of the electrode lead 12, a receive provided in the lower pouch 132 space 1331 the electrode assembly 10 is accommodated, the top pouch 131 is covering the accommodating space 1331 at the top. Then, when an electrolyte solution is injected therein and the sealing portion formed on an upper rim of the pouch 131 and the pouch bottom 132 seal, the secondary cell 1 is produced as shown in Figure 2.
[58]
3 is a cross-sectional view of the battery case 13 in accordance with one embodiment of the present invention.
[59]
A battery case 13 in accordance with one embodiment of the present invention is a pouch made of a flexible material. In general, a battery case 13 accommodating the electrode assembly 10, as shown in Figure 3, the gas barrier layer (Gas Barrier Layer, 21), a surface protection layer (Surface Protection Layer, 22) and the sealant layer ( It includes Sealant Layer, 23). The gas barrier layer 21 comprises a metal that block the gas access, and is mainly used a thin film of aluminum (Al Foil). The surface protective layer 22 is because the friction and collision between the outer frequently located in the outermost layer, a polymer such as nylon (Nylon) resin or PET having a mainly wear resistance and high heat resistance is used. And the sealant layer (23) is located in the innermost layer is in contact directly with the electrode assembly 10, and is mainly used by a polymer such as polypropylene (PP).
[60]
Pouch-shaped battery case 13 is made of a film having a laminate structure as described above is processed into a bag shape, when electrode assembly 10 is accommodated in the electrolytic solution is injected. After contacting with each other the upper pouch 131 and the pouch bottom 132, when the thermo-compression bonding to the sealing part between the sealant layer 23 by being a battery case 13 is sealed. At this time, the sealant layer 23 is so brought into contact directly with the electrode assembly 10 needs to have an insulating property, and to have the corrosion resistance, so also in contact with the electrolyte. In addition, completely seal the inside so to block the material flow between the inside and the outside, should have a high sealability. That is, between the sealant layer 23, the adhesive sealing portion to have a high thermal bonding strength. Typically, this sealant layer 23, the polyolefin-based resin such as polypropylene (PP) or polyethylene (PE) is used. Specifically, polypropylene (PP) is mainly used for the production of tensile strength, rigidity, surface hardness, wear resistance, mechanical properties and excellent chemical properties such as corrosion resistance, and the sealant layer 23 such as heat resistance.
[61]
Figure 4 is a perspective view showing a state that the volume of the pouch type secondary battery 1 according to one embodiment of the invention the expansion.
[62]
On the other hand, in general, the electrode assembly 10 is charged and discharged by the oxidation and reduction reactions. Therefore, the secondary battery (1) If repeatedly charged and discharged, such as electrolytes and, to some extent, to the gas generated by the electrochemical reaction due to the electrode active material, the electrode overcharge or short circuit due to internal reactions of the assembly 10, two euros abnormal as it may occur more gas. Here, the pouch-shaped battery case 13 because the respective layers are all of a material of the soft, the generated gas is to elevate the internal pressure of the secondary battery 1, the pouch type secondary battery as shown in Figure 4 the volume of (1) expands.
[63]
Figure 5 is a part of a cross-sectional view taken of a conventional pouch-shaped secondary battery including a plurality of electrode lead 12 is also to A-A 'of FIG.
[64]
Described above, the battery case 13 when the internal gas is generated in the to elevate the internal pressure of the secondary battery (1) weakened binding force between the parts, the secondary battery (1) Case damage, premature operation of a protection circuit as described, the electrode the cause problems, such as deformation, internal short circuit or explosion. To the To address this, the pouch-shaped multiple electrode lead (1230, 1240) in the secondary battery (1) of the (Pouch Type) formed in a second stage, the battery case 13, a plurality of electrode lead (1230, 1240 when the expansion ) can block electrically connected to each other such that the removable blocking the connection to the physical. Here, the removable means that the less it is adsorbed or attached.
[65]
As specifically shown in Figure 5, the secondary battery includes a plurality of electrode lead 12, a first electrode lead 1230 and a second electrode lead 1240. Then, the one end being the one surface of the adhesive through a connecting portion 15. Each of the first electrode and the other terminal the second electrode lead 1240 of the lead 1230, are connected to each other. At this time, the first and second electrode leads (1230, 1240), it is preferred that the upper and lower surfaces to each other are connected to each other positioned on the different planes.
[66]
Figure 6 is a part of a cross-sectional view taken in line A-A 'of Figure 2 when the volume of the conventional pouch-shaped secondary cell expansion comprising a plurality of electrode leads (12).
[67]
When the gas is generated inside the battery case 13 is expanded, the volume of the secondary battery (1), increases the size of the repulsive force applied to the first electrode lead 1230 and a second electrode lead 1240. And as shown in Figure 6, the first and second electrode leads (1230, 1240) is detachable from each other after all. Therefore, the electrical connection is cut off, electricity can not flow any more.
[68]
However, the prior art did not have the inside of the battery case which is detachable such a plurality of electrode lead (1230, 1240) the pressure constant. More specifically, if the secondary cell 1 of the same model, the size and location of the specification, the first and second electrode leads (1230, 1240) of the battery case 13 are all the same. However, the first and the insulating portion 14, surrounded near the second electrode lead (1230, 1240) to perform the sealing process, has the form of a film made of a flexible material. By the way, the first and second electrode leads (1230, 1240) are also removable when the desorption, the insulation portion 14 has been attached to the first electrode lead 1230. At this time, the insulation having the form of the film unit 14 is not easy to maintain a constant length which is attached to the first electrode lead 1230. That is, the adhesion between the insulating section 14 and the first electrode lead 1230 is not constant. Accordingly, not constant but also the pressure inside the current is cut off, it does not also easy for a user to control, there is a problem that can not be secured always constant the reliability of safety.
[69]
Figure 7 is a part of a cross sectional view taken a pouch type secondary battery 1 according to one embodiment of the invention in A-A 'of Figure 2;
[70]
The pouch type secondary battery 1 according to an embodiment of the present invention, as shown in FIG. 7, a plurality of electrode lead 12. That is, the first being connected to the electrode tab 11 of the electrode assembly 10 and a second electrode lead (124) which projects out of the electrode lead 123 and the battery case 13. At this time, and the first electrode lead 123 has one end connected to the electrode tabs 11 and the other end connected to the second electrode lead 124. And a second electrode lead 124 is one end of the first electrode being connected to the other end of the lead 123, the other end protrudes to the outside of the battery case 13. Then, the one end being the one surface of the adhesive through a connecting portion 15. Each of the first electrode lead 123, the other end of the second electrode lead 124 in, are connected with each other.
[71]
A battery case (13) when the normal, the first and second electrode leads 123 and 124 are to be reliably connected to each other, the battery case 13 when the inflatable first and second electrode leads (123, 124) with each other It must be easily removable. Therefore, the first and second electrode leads 123 and 124, it is preferred that rather than the side surface located on the same plane connection, to one another located on a different plane in which the upper and lower surfaces are connected to each other.
[72]
First and second electrode leads (123, 124) a connection (15) connecting to each other is preferably a thin film form having a conductivity. In particular, the thickness of the connecting portion 15 is preferably very thin as 1 to 500 μm. Accordingly, even when forming the stepped first and second electrode leads 123 and 124, the size of the step may not be large excessively, can be easily discharged to the outside of the electricity generated from the electrode assembly 10. To this end, the connecting portion 15 is preferably a polymer containing a conductive material.
[73]
A conductive material such as natural or artificial graphite; Carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, carbon black and thermal black; Conductive fibers such as carbon fibers or metal fibers; Metal such as carbon fluoride, aluminum, nickel, gold, silver, copper powder powder; Powder having a Core / Shell Structure coated with a metal on a heterogeneous one kind of metal; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Polyphenylene may be used such that at least one of conductive materials such as alkylene derivatives.
[74]
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 ), comprising at least one of a PE (polyethylene), polyimide, polyamide, acrylic resin is most preferred.
[75]
The portion of the electrode lead 12 as described above is surrounded by a surrounding insulating portion 14. And through the insulating portion 14, the electrode lead is attached to the battery case. In the process of the upper pouch 131 and a lower pouch 132 sealing portion in contact with the electrodes lead 12 is relatively, so the pressure is high, the possibility that the sealant layer 23 of the battery case 13 is damaged is high . The sealant layer 23 has an insulating property, such as, the electrode assembly 10, and because direct contact described above. However, if the sealant layer 23 is broken, the electrical flow to the battery case 13 via the electrode lead 12. In particular, if the gas barrier layer 21 of the battery case 13 is so made of a metal such as aluminum, the sealant layer 23 is damaged little gas barrier layer 21 is exposed, into contact with the electrode leads 12 and it can flow to the electrical easily.
[76]
Therefore, the insulating section 14 is made of non-conductive with a non-conducting electricity is impervious well. Further, the insulating section 14 has a high mechanical strength and heat resistance. The insulating section 14 is provided with, for example, may include polyolefinic resin such as polypropylene (PP) or polyethylene (PE). Specifically, polypropylene (PP) are excellent in chemical properties such as mechanical properties and corrosion resistance, such as tensile strength, rigidity, surface hardness, wear resistance, heat resistance, and is mainly used for manufacturing the insulating portion 14. Further, there, it may comprise the acid treatment of polypropylene in order to improve the adhesion of the insulating portion 14. For example, there may be mixed with the acid-treated polypropylene and normal polypropylene, and may be further mixed with poly ethylene, there may simply include only the acid-treated polypropylene. Wherein the acid-treated polypropylene PP may be MAH (maleic anhydride polypropylene).
[77]
Therefore, the upper pouch 131 and a lower pouch 132, the heat insulating portion 14 when the fusion is to maintain the shape, even if the sealant layer is the gas barrier layer 21 is exposed is a part broken-electrode lead 12 and the gas to block the contact of the barrier layer 21. Thereby preventing the electricity generated from the electrode assembly 10 flows into the battery case 13 via the electrode lead 12. And the insulation portion 14 has high adhesion. Accordingly, the upper pouch 131 and the pouch bottom 132 of the battery case 13 is limited to the sealing portion is heat-sealed position, thereby adhering the electrode lead 12 to the battery case 13. The insulating portion 14 may be comprised of at least one of thermoplastic, thermosetting, photo-curing resin having the electric insulating property as the polymer resin. Roneun generally insulating portion 14, it facilitates attachment to the electrode lead 12, and one using a lot of relatively thin insulating tape is thick, there may be isolated a electrode lead 12 is not limited to be used for various members have.
[78]
The insulating portion 14, as shown in Figure 7 encompasses both the first electrode lead 123, the connecting portion 15 and the second electrode lead 124. If the first electrode do not surround the lead 123 or connection part 15, the battery case 13 even if the expansion because it is not possible to apply a repulsive force to the first electrode lead 123 and the second electrode lead 124 to be. Detailed description of the repulsive force will be described later.
[79]
The pouch type secondary battery 1 according to an embodiment of the present invention may further comprise a fusion preventing portion 16 as shown in FIG. Fusion preventing section 16 to prevent the fusion between the first are formed in a specific location on the surface of the electrode lead 123, a first electrode lead 123 and the insulating portion 14. Detailed description of the anti-fuse unit 16 will be described later.
[80]
Figure 8 is a part of a cross-sectional view taken in Figure A-A 'of 2 when the volume of the pouch type secondary battery 1 according to one embodiment of the invention the expansion.
[81]
If the pressure in the interior of the above-mentioned bar, the pouch-shaped battery case 13, and expands the volume of the pouch type secondary battery (1). Therefore, as the movement, towards the outer wall of the battery case 13, the outside shown in Fig. At this time, top wall and bottom wall in the outer wall of the battery case 13 is not is not a wide area larger than the sealing wall, is even greater ductility. Accordingly, the upper wall of the battery case 13 upward, the bottom wall is larger it will tend to move downward.
[82]
When the volume of the secondary battery (1) expansion, a, a battery case 13, the first electrode lead 123 and the second electrode the outer wall through the insulating section (14) while moving toward the outer side as shown in FIG. 8 applies a repulsive force to the lead 124. the Therefore, when the internal pressure of the battery case 13 increases becoming increasingly more power to the outer wall of the battery case 13 moves, the first electrode lead 123 and the second electrode of the repulsive force applied to the lead 124, the size also further increased. A first electrode lead 123 and the second electrode when the more the adhesive strength between the lead 124 becomes a magnitude of the repulsion further increases, the first electrode lead 123 and the second electrode lead 124, as shown in Figure 8 It is removable in the end. Therefore, the electrical connection is cut off, electricity can not flow any more. However, this time the first or the second electrode adhesion strength between the leads 123 and 124 and the connecting portion 15, the first electrode the other side of the leads 123 and the insulating part 14 or the second electrode lead 124 and the insulating weaker than the adhesive force between the section 14. Thus, when the repulsive force to the first electrode lead 123 and the second electrode lead 124 is applied, the adhesive force between the first electrode the other side of the lead 123 or the second electrode lead 124 and the insulating portion 14 is is maintained sealing of the battery case 13 is maintained, the first and second electrode leads (123, 124) are detachable from each other. However, the adhesion between the first electrode a third position of the leads 123 (1233) and the insulating portion 14 is weaker than the adhesive force between the first and second electrode leads 123 and 124 and the connecting portion (15). The detailed description will be described later.
[83]
Figure 9 illustrates a first electrode lead 123, the second electrode lead 124 and an enlarged view an enlarged connecting portion 15, 10 is 8, according to an embodiment of the invention shown in Figure 7 the one is an enlarged close-up of the first electrode lead 123, the second electrode lead 124 and the connecting portion 15 according to one embodiment of the invention.
[84]
The pouch type secondary battery according to an embodiment of the present invention (1), and the fusion preventing portion 16 as shown in Figure 9 further comprising. Insulating portion as described above (14) are located is limited to the sealing part is an upper pouch 131 and the pouch bottom 132 of the battery case 13 is heat-sealed. Then, when the sealing portion sealing, insulating portion 14 is also heat-sealed with the lid is attached to the first electrode 123 and second electrode lead 124. At this time, the fusion preventing section 16 to prevent the fusion between the first are formed in a specific location on the surface of the electrode lead 123, a first electrode lead 123 and the insulating portion 14. As such, when the battery case 13 is expanded by the first electrode lead 123 and the second electrode lead 124 is detachable from each other, the first electrode by the fusion preventing portion 16 as shown in Figure 10 one side and the insulating portion 14 of the lead 123 is also detachable from each other. At this time, by adjusting the length (L) of the fusion preventing portion 16, it is possible to control the first and second electrode leads the internal pressure at which the desorption (123, 124).
[85]
According to one embodiment of the invention, the anti-fusing portion 16 is not present as a separate member, refers to a specific location on the surface of the first electrode lead (123). Wherein one surface of the first electrode lead 123 is a surface facing a from a number of sides, the connection 15 and the second electrode lead 124 of the first electrode lead (123).
[86]
The one surface of the first electrode lead 123, connection portion 15 is the 1231 first position is attached, wherein the second position which is located inward from the first location (1231) the battery case 13 (1232 ), and a third position (1233) positioned on the inner side direction of the battery case 13 from the second position (1232). That is, the first to third positions (1233) are arranged side by side in the one side as shown in FIG. Then, the fusion preventing portion 16 is formed on the second position 1232, the insulation portion 14 is preferably attached to a third position (1233). However, but not limited to anti-fuse unit 16 is formed in a third position (1233), the insulating portion 14 may be attached to a second location 1232. Thus, the fusion preventing portion 16 is formed in a direction towards the inside of the first electrode cell casing 13 from one side of the surface on the lead 123 which is the connection part 15 is attached and on the same plane, and the connecting portion (15) do.
[87]
Fusion preventing section 16 to prevent the fusion between the first electrode lead 123 and the insulating portion 14. Specifically, the first electrode adhesion between the lead 123, a second position 1232 or the insulating portion 14 and the fusion preventing portion 16 of the can, the first electrode lead 123, the 3-position (1233) and the isolated weaker than the adhesive force between the section 14. The it is because one electrode in a third position (1233) of the lid (123) a surface treatment is performed, and insulating portion 14 is provided with the acid treatment. However, the battery case 13 is when expanded, in fact, first the second position 1232 or the insulating portion 14 and the desorption, and a first electrode lead (123 between the fusion preventing portion 16 of the electrode leads 123 ) it may result in almost the installation and removal of the three positions (1233) and the insulating part 14 at the same time.
[88]
Then, the adhesive strength between the first electrode lead 123, the third position (1233) and the insulating portion 14 is of, the weaker than the adhesive force between the first and second electrode leads 123 and 124 and the connecting portion (15). Accordingly, the battery case 13 is when expanded, the first electrode a third position (1233) and the insulating section 14 is removable, first, first and second electrode leads 123 and 124 of the lead 123 and the connecting portion 15 may be later detached relatively.
[89]
In addition, the first and second electrode leads 123 and 124 and the adhesive strength between the connecting portion 15, the first other surface and the insulating part 14 or the second electrode lead (124 of electrode leads 123, as described above ) and weaker than the adhesive force between the insulating portion 14. Therefore, if the battery case 13 is expanded, the adhesion between the first electrode the other side of the lead 123 or the second electrode lead 124 and the insulating portion 14 is maintained sealing of the battery case 13 is held .
[90]
That is, the first electrode a third position (1233) of the leads (123) the other surface and the insulating portion 14, first and second electrode leads 123 and 124 and the connecting portion 15, a first electrode lead 123 of the and becomes more adhesive force about the order of the insulating portion 14 and the first electrode lead 123, a second position 1232 or the insulating portion 14 and the fusion preventing portion 16 of the. Thus, when the battery case 13 is expanded, the first electrode lead 123, a second position 1232 or the insulating portion 14 and the fusion preventing portion (16) removable, a first electrode lead (123) between the the desorption of the three positions (1233) and the insulating portion 14 is substantially simultaneous. And, finally, there is a first electrode first position 1231 and a connecting portion (15), the first and second electrode leads 123 and 124 while the removable lid 123 may be removable from each other.
[91]
At this time, by adjusting the length (L) of the fusion preventing portion 16, it is possible to control the first and second electrode leads the internal pressure at which the desorption (123, 124). For example, a relatively short form a length (L) of the fusion preventing portion 16, the first electrode the adhesion by increasing the area between the third position (1233) and the insulating portion 14 of the lead 123, FIG. increases so, the internal pressure which is the removable first and second electrode leads 123 and 124 is increased. On the other hand, if a relatively elongated length (L) of the fusion prevention unit 16, a third position (1233) and the insulating section 14 decreases the adhesive force even area is reduced between the first electrode lead (123) therefore, the first and the internal pressure at which the removable second electrode leads (123, 124) decreases. And, in the secondary battery (1) of the same size and model, the first and can be controlled to constant internal pressure at which the removable second electrode leads (123, 124). The length (L) is one preferably 1 to 4mm, without limitation, may have a variety of length (L).
[92]
In order to form the anti-fuse unit 16, the first electrode surface and to significantly degrade the adhesion between the insulating portion 14 of the lead 123, or to be removed. However, typically the electrode leads 123 and the insulating portion 14 in order to be attached, the electrode leads 123 are to be a need to perform a surface treatment on the surface of the metal, and the insulating portion 14 is acid-treated. Therefore, in order to form a fusion preventing portion 16 it is necessary to remove at least one condition from two of the above. Hereinafter, various embodiments of forming a fusion preventing portion (16).
[93]
As described above, according to one embodiment of the invention, the fusion preventing portion 16 does not exist as a separate member. For this purpose, the time to manufacture the first electrode lead 123, after performing the surface treatment to a metal, a second position 1232, it can be polished by using a polishing apparatus, such as a grinding or abrasive such as sandpaper.
[94]
Specifically, the electrode lead 12 is made of a metallic material. That is, as described above, the positive electrode lead 121 is the same aluminum (Al) material body and the positive electrode collector, a negative electrode lead 122 is the same copper (Cu) and the negative electrode collector material, or nickel (Ni) with the coated copper material can be. However, but not limited to a cathode lead 121 and anode lead 122 can be made of different materials, respectively, and the total cathode current collector and the anode current collector. Furthermore, the electrode lead 12 of copper (Cu), aluminum (Al), nickel (Ni), iron (Fe), carbon (C), chromium (Cr), manganese (Mn), such as electrode tab 11 and the outer there can be connected to the terminal and electrically may be made from a variety of materials.
[95]
When the surface treatment is performed on the metal surface treatment layer is formed. Surface treatment layer may have can be easily attached because of the hydrophilicity, the electrode lead 12 and the insulating portion 14. That is, it is excellent in adhesion to the surface treatment layer and the insulating part 14. However, such adhesion is the first and the second electrodes to each other when the detachable lid (123, 124), acts as a force to resist this. Thus, the more the adhesive strength between the lead electrode 12 and the insulating portion 14 steel, and the first and second electrodes also increases the pressure of the lead (123, 124) the battery case 13 is removable.
[96]
Furthermore, when the surface treatment layer is formed, the battery case 13, the sealant layer 23 and after a heat fused bonding of a defect such as corrosion or peeling caused by internal and external magnetic poles of the secondary battery (1) occurs It can be prevented. And the physical and chemical properties of the coated layer depends on the method of performing the surface treatment to the metal, the performance of the bonding strength, such as in the electrolytic solution itself from the insulating portion 14 can be different.
[97]
Thus, to carry out surface treatment of the electrode lead 12, it can be generally used a chromium (Cr). When using the chromium film is formed on the surface of the metal, it has excellent adhesiveness and resistance to electrolytic solution itself from the insulating portion 14. However, since harmful to humans and the environment, its use is being restricted receiving regulated by the RoHS. Therefore, in recent years, in place of chromium, PMMA (polymethyl methacrylate, Polymethylmethacrylate), using polyacrylamide (Polyacrylamide), or oxygen (O 2 ), ammonia (NH 3 as a gas, etc.), argon (Ar) It has been proposed, such as a plasma processing method that causes the plasma discharge. However, this is not limited there to the surface treatment in the electrode lead 12 may be employed various methods.
[98]
According to one embodiment of the invention, the electrode lead 12, the surface treatment performed after the surface treatment layer is produced, the abrasive material such as sand paper to the second position 1232 of the one surface of the first electrode lead 123, or to It can be polished by using a polishing apparatus, such as a grinder. In this way, there is the adhesion to the insulating part (14) when in the second position (1232) the surface treatment layer is removed from the grinding and forming a fusion preventing portion 16, a heat seal may be impaired.
[99]
In addition to the method for polishing a second position (1232) it may be used in other ways. According to one embodiment variant of the invention, it is possible to perform the taping operation for first attaching a first tape to the second position 1232 of the first electrode lead (123). Thereafter, when performing the above-described surface treatment, the surface treatment layer is formed on the remaining positions other than the second position 1232 of the first electrode lead (123). And, removing by peeling the said joining a first tape, a second position (1232) is surface-treated layer is formed not only, can be formed with a sealed stopper section (16). The first tape is, it must not be corrosive or deformed during the surface treatment. Therefore, it is preferred that the corrosion resistance and wear resistance is made of a material excellent.
[100]
Figure 11 is an enlarged close-up of the first electrode lead 123, the second electrode lead 124 and the connecting portion 15 according to another embodiment of the present invention corresponding to Fig.
[101]
Fusion preventing part 16 in accordance with one embodiment of the present invention is not present as a separate member, refers to a specific location on the surface of the first electrode lead (123). On the other hand, as sealing stopper section (16a) in accordance with another embodiment of the present invention is shown, illustrated in Figure 11, it exists as a separate member. The following describes the fusion preventing portion (16a) in accordance with another embodiment of the present invention. However, description of the contents is the same as fusion preventing part 16 in accordance with one embodiment of the above-described present invention will be omitted.
[102]
Fusion preventing portion (16a) in accordance with another embodiment of the present invention may also be formed on the second position 1232 of the first electrode lead (123). To do this, it is possible to perform the first electrode after performing the surface treatment to prepare a lead 123, the taping operation for attaching a second tape to the second position 1232 of the first electrode lead (123). Thereafter, using a connecting portion 15 connecting the first electrode lead 123 and the second electrode lead 124, and the first and second electrode leads 123 and 124 welded to the insulation portion (14a) surrounding the do. Then, a, of the adhesive tape 2 as shown in Figure 11, is the fusion preventing portion (16a) in accordance with another embodiment of the present invention. On the other hand, fusion preventing portion (16a) is preferably a very small thickness, it may be approximately 20 to 50 μm.
[103]
As described above, the insulating part (14a) has, for example, polypropylene (PP) or polyethylene may be included in the polyolefin-based resin such as (PE), in particular may comprise a polypropylene with acid treatment. Wherein the acid-treated polypropylene PP may be MAH (maleic anhydride polypropylene). Such an acid treatment polypropylene improves the adhesive force when heat-sealing can be attached to the electrode lead (12). However, normally it polypropylene non-acid treatment, even if the heat seal is not attached to the electrode lead (12). The second tape to which the fusion preventing portion (16a) when said first Unlike tape is not peeled off after the attachment, to be the insulating part (14a) heat-sealed, the second tape is also heat-sealed together. Thus, the second tape is preferably made of a polyolefin-based resin, especially polypropylene, normal untreated, even if the acid does not adhere to the welded electrode lead 12.
[104]
Figure 12 is an enlarged close-up of the first electrode lead 123, the second electrode lead 124 and the connecting portion 15 according to another embodiment of the present invention corresponding to Fig.
[105]
Such as fusion preventing portion (16a) according to Figure fusion preventing portion (16b) according to another embodiment of the present invention, another embodiment of the present invention, there exists as a separate member. The following describes the fusion preventing portion (16b) according to another embodiment of the present invention. However, description of the contents is the same as fusion preventing portion (16, 16a) according to one embodiment and other embodiments of the invention described above will be omitted.
[106]
The above-described fusion preventing portion (16a) in accordance with another embodiment of the present invention can be formed by attaching a second tape to the second position 1232 of the first electrode lead (123). On the other hand, fusion preventing portion (16b) according to another embodiment of the present invention has a first electrode lead 123, it may be attached to a specific position of the insulating portion (14b). The specific location of the insulation portion (14b) is a position which corresponds to the second position 1232 of the first electrode lead (123). That is, a contact in the second position 1232 of the fusion preventing portion (16b) is when fusing the insulating portion (14b) after being attached to the insulating portion (14b), fusion preventing portion (16b) of the first electrode lead (123) It refers to a position.
[107]
And, it is not peeled off even after the attached fusion preventing portion (16b), are heat-sealed together when the insulating portion (14b) to be heat-sealed. Thus, the fusion preventing portion (16b) is preferably made of a polyolefin-based resin, especially polypropylene that is not normal, the acid treatment that even if the heat seal is not attached to the electrode lead (12). However, it may be prepared in the form of a film, and more fusion preventing portion (16a) according to said another embodiment of the present invention also thicker the thickness, may be approximately 50 to 200 μm.
[108]
However, but not limited to, the preparation of the poly insulating portion 14 to the acid treatment of propylene, if only a portion of the insulating portion 14 may not be acid treated, the fusion preventing portion (16b) is present as a separate member does not, a portion of the insulating portion 14 is not processing the acid may be a fusion preventing portion (16b).
[109]
One of ordinary skill in the art will appreciate that the present invention without changing departing from the scope and spirit be embodied in other specific forms. Thus the embodiments described above are only to be understood as illustrative and non-restrictive in every respect. The scope of the invention is represented by the claims below rather than the foregoing description, it should be construed that various embodiments derived from the meaning and scope of the appended claims and their equivalents within the scope of the invention concept.

WE Claims

[Claim 1]
Electrode assembly electrode, and a separator are alternately stacked to including a positive electrode and a negative electrode; A battery case accommodating the electrode assembly; An electrode tab is connected to the electrode which protrudes from one side of the electrode assembly; A first electrode lead having one end connected to the electrode tab; Once the connection and the other end of the first electrode lead and second electrode lead which is the other end protruding to the outside of the battery case; Connection to interconnect the first and second electrode leads; It said first and said insulating portion to surround the portion of the second electrode lead, and is fused, bonding the first and second electrode leads to the battery case; And the first is formed to a location on one side of the electrode lead, wherein the anti-fuse to prevent fusion between the first electrode lead and the insulating portion including a pouch type secondary battery.
[Claim 2]
The method of claim 1, wherein the fusion preventing portion, from one side of the connecting portion, the pouch-shaped secondary cell, which forms the inside of the battery case in a direction toward.
[Claim 3]
The method of claim 1, wherein the fusion preventing portion, the pouch-shaped secondary cell, which is formed by performing an abrasion processing on the particular location.
[Claim 4]
The method of claim 1, wherein the fusion preventing portion, the pouch-shaped secondary cell, which is formed by performing a surface treatment to the non-specific location.
[Claim 5]
The method of claim 4, wherein the fusion preventing unit comprises: a first tape, and the attachment formed by the separation of the first tape after performing the surface treatment, the pouch type secondary battery in the particular position.
[Claim 6]
The method of claim 1, wherein the insulating portion, the pouch type secondary battery, comprising an acid-treated polyolefin resin.
[Claim 7]
The method of claim 6, wherein the polyolefin-based resin, a pouch-type secondary battery, comprising a polypropylene.
[Claim 8]
The method of claim 1, wherein the fusion preventing portion, the pouch-shaped secondary cell, which is formed by attaching a second tape to the specific position.
[Claim 9]
The method of claim 8, wherein the second tape, the pouch type secondary battery, comprising a normal polypropylene non-acid treated.
[Claim 10]
The method of claim 1, wherein the fusion preventing portion, the pouch-shaped secondary cell, which is formed by a film attached to the position of the insulating part corresponding to the specific position.
[Claim 11]
11. The method of claim 10 wherein said film is a pouch type secondary battery, comprising a normal polypropylene non-acid treated.
[Claim 12]
The method of claim 1, wherein the adhesive force between the specific position or the insulating portion and the fusion preventing part of the first electrode lead is, the first or second electrode lead and weaker than the adhesive strength between the connecting portion, the pouch type secondary battery.
[Claim 13]
The method of claim 1, wherein the connecting part, the pouch-shaped secondary cell, which is made of a conductive polymer comprising a conductive material.
[Claim 14]
The method of claim 1, wherein the connecting part, the pouch type secondary battery having a thickness of 1 to 500 μm.
[Claim 15]
The method of claim 1, wherein the insulating portion, the first and second electrode leads are connected to surround the portion through said connecting portion, the pouch type secondary battery.