[1]This application claims the benefit of priority based on the Korea Patent Application No. 2017-0115201 years dated 8 September 2017, and all information disclosed in the literature of the Korea patent application are included as part of the specification.
[2]The present invention is more detail relates to a secondary battery of the electrodes and containing the same to improve the welding properties of the electrode tabs, the present invention relates to maintaining the welding stability resulting from the increase in the number of electrode layers to be laminated in order to realize a high output and capacity improving the properties of welding an electrode tab forming at least one coated portion of the electrode tab of the electrode stack in the same order to the plurality electrodes, and is for a secondary battery comprising the same.
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 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.
[4]
Secondary battery has a positive electrode / separator / the cathode structure, the electrode assembly is a bar that is also classified according to whether comprised of any structure, typically of the structure take-up of the long sheet-like positive electrode and the negative electrode in a separator is interposed state jelly-roll (wound type) electrode assembly, while interposing the cut a plurality of positive and negative electrodes of the stack sequentially stacked in a state of sandwiching the membrane-type (stack-type) electrode assembly, a separator of the positive electrode and the negative electrode of a predetermined unit in a unit of a predetermined size, a bi-cell, and the like (Bicell) or a stack structure of a take-up the full cell (Full cell) / folding type electrode assembly is laminated in.
[5]
In recent years, such as a pouch-type battery of a structure built in the stacking or stacking / folding type electrode assembly in a pouch-shaped battery case made of aluminum laminate sheet, and low manufacturing cost, small weight, easy to form the modified reason, collect a lot of interest and also its usage increase gradually. The secondary battery may comprise an electrode assembly that is the positive electrode plate and negative electrode plate are sequentially stacked in a conventional separator is interposed condition, the casing of the battery case for accommodating the electrode assembly. At this time, the electrode assembly is there are a plurality of negative electrode tabs that extend from the plurality of positive electrode tabs and a plurality of negative electrode plates are formed with extending from the plurality of positive electrode plates, and these plurality of positive electrode tabs and a plurality of negative electrode tabs and the respective positive electrode lead by a cathode lead and an ultrasonic welding machine is coupled to welding. Here, the configuration of the plurality of positive electrode tabs and a plurality of negative electrode tabs and the electrode tabs, it becomes a positive electrode lead and negative electrode lead constituting the electrode lead.
[6]
Not the coding type of wire in the secondary battery, by welding the can to be sipcheung uncoated portion of the electrode tab for the multi-layer electrode structure, have to establish mutual energization (通電) path, it is possible to electrically operate. In particular, in the case of a car battery, and further to realize a high output and capacity, the number of stacked electrode layer is positive electrode and the negative electrode sheet 20 and 30 respectively, or cosmetic contact failure is because the bundle getting a lot more than that.
[7]
Further, due to the need for welding of high energy for the welding layer of thickened, even if the ultrasonic or laser welding, and damage to the weld occurs, a situation that welding defects increases. Furthermore, even if that the welding is completed in the battery cell step, the battery pack process is an additional high energy welding followed by, for example, for a thicker bus bar welding, and in this case, welding is weakly welding electrode tab region inside cells falling bad road and bundles
[8]
In this way, when the welding of the electrode tab and the electrode lead by means of an ultrasonic welding machine, in the case of performing the welding failure of the plurality of electrode tabs occurs, a strong electrode tab and the welding of the electrode lead had a problem that the electrode tab is broken.
[9]
Conventionally, but it will attempt to control by the welding method and a welding surface reliably form an electrode lead and the connection of the electrode tab, and there was no attempt to form a stable welding by improving the shape uncoated portion of the electrode tab.
[10]
Meanwhile, Korea Patent Laid-Open Publication No. 2017-0022314 discloses a technology related to a battery cell having an electrode tab is connected at a plurality of positions, to form each of the first electrode tabs and the second electrode tab formed in the uncoated portion to the lead parts of the electrode leads and the bond the point that the ultrasonic welding, the claims 1, 2 and a portion corresponding to, but technology formed so as to overlap with the solid portion of the same tab electrode alternating ahnigie is different.
[11]
In Korea Laid-Open Patent Publication No. 2017-0032031 No. some point in a technology related to the electrode stack structure, and a battery having a multi-tap structure, the first and second tabs formed on the uncoated portion welded to the lead portion can be connected electrically to each other corresponding Although, this technique having a coated portion of the tab electrode to the same alternating to overlap ahnigie is different.
[12]
In Korea Laid-Open Patent Publication No. 2016-0020284 call point that the first and second electrode tabs are formed, the coated portion as a description of the battery pack is directly connected to the terminal hole formed on a circuit board, but some response, the uncoated portion of the same electrode tab this technique provided so as to alternate with overlapping ahnigie is different.
[13]
In Japanese Patent Publication No. 5877047 call as description of the laminate type energy device and a method of manufacturing the same, but the point is connected to the leading electrode and the tab electrode formed on the coated portion is welded portion corresponds, so as to overlap with the solid portion tab of the same electrode alternating this technique ahnigie formed is different.
[14]
The In this manner, the secondary battery in particular, the foil in the electrode tab and the case of ultrasonic welding the electrode lead, portions plain side horn electrode tab thin foils are here superimposed multiple copies of a plurality welding is not completed, or the battery pack process of the pouch type secondary battery causes problems in the performance of the battery by a phenomenon that breakage occurs bar, whereby for part solid to a fundamental solution to improve the shape of the electrode tab secondary battery technologies, including the secondary battery electrode, and it excludes the phenomenon of broken after welding bars indicated none.
[15]
Korea Patent Laid-Open Publication No. 2017-0022314 No.
[16]
Korea Patent Laid-Open Publication No. 2017-0032031 No.
[17]
Korea Patent Laid-Open Publication No. 2016-0020284 No.
[18]
Patent Application No. 5877047 in Japan No.
Detailed Description of the Invention
SUMMARY
[19]
The present invention for solving the above problems, one or more of the same electrode uncoated portion electrode tabs of the laminate into a plurality to maintain the welding stability resulting from the increase in the number of electrode layers to be laminated in order to realize a high output and capacity improving the properties of welding the electrode tabs forming electrode and an object thereof is to provide a secondary battery including the same.
[20]
Further, the plurality of electrode tabs and / or welding of the weld defect and the electrode tab that disconnection is formed in one or more solid sub-electrode tab of the same electrode stack of a plurality which may be preventing the electrode tabs of by welding by the welding of the electrode lead to provide a secondary battery including the electrode, and this improves the characteristics and purposes.
[21]
Further, an object of the present invention to provide an electrode tab and / or the secondary battery uniform welding strength variation of the weld by applying which the electrode tab is formed at least one uncoated portion electrode tab of the same electrode stack of a plurality during ultrasonic welding of the electrode lead do.
Problem solving means
[22]
This, uncoated portion of the electrode tab, the same electrode stacked in plurality in accordance with the present invention for achieving this end provides a secondary cell electrode, characterized in that formed in at least one.
[23]
In addition, one or more portions overlapping the solid electrode tab may be spaced apart by a predetermined distance coupled to the electrode lead.
[24]
In addition, one or more of the uncoated portion electrode tab may be combined without departing from the width of the electrode lead.
[25]
Furthermore, the solid portion of the same electrode stack of a plurality thickness (Tt) of the electrode tab can be reduced in inverse proportion to the number to be superimposed into the uncoated portion electrode tab.
[26]
In addition, one or more portions overlapping the solid electrode tabs may be formed so as to overlap alternately.
[27]
In addition, the uncoated portion electrode lead is welded to the electrode tab, the lower end may be formed of other emitted by the predetermined distance.
[28]
In addition, the length of the punching from the lower end may be extended to the insulating tape area.
[29]
Furthermore, the solid portion of the same electrode laminated in plurality according to an ultrasonic welding horn for welding the electrode tabs, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; Inclusion and, as the outer shell portion of the horn pattern area increase in the number of divided portions of the solid electrode tabs, the side surface of the protruding unit of the pitch pattern are rounded may be carried out the welding.
[30]
Furthermore, the solid portion of the same electrode laminated in plurality according to an ultrasonic welding horn for welding the electrode tabs, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; Inclusion and, as the outer shell portion of the horn pattern area increase in the number of divided portions of the solid electrode tab, the tip sharpness (Sharpness) of the convex unit of the pitch pattern is decreased may be carried out the welding.
[31]
In addition, as the protruding units, if a pitch pattern is part the plain for welding the electrode tabs and / or contact with the electrode leads, an increase in the number aliquot of the uncoated portion electrode tab, wherein the protruding unit pitch pattern portion the solid electrode radius (r in contact with the inside of the protruding unit pitch pattern to form a tab and / or electrode lead- h may be formed so) to increase.
[32]
Furthermore, the protruding unit pitch pattern may be a semi-spherical protrusion pattern having a side wall curvature.
[33]
Also, the secondary battery including the secondary battery electrode may be a secondary battery, characterized in that the jelly-roll or stacked-layer type.
[34]
In addition, the device may be characterized in that it comprises a secondary battery including the secondary battery electrode.
[35]
In addition, the device may be a device being selected from the group consisting of an electronic apparatus, an electric vehicle, hybrid vehicle and the power storage device.
Brief Description of the Drawings
[36]
1 is a view of the electrode tab and the electrode lead welding portion of a conventional pouch type secondary battery.
[37]
2 is a conceptual diagram showing the electrode tab and the electrode lead welded structure of a conventional pouch type secondary battery.
[38]
3 is a view of a conventional pouch type secondary battery horn pattern area composed of a unit pitch pattern.
[39]
4 is a conceptual diagram illustrating a portion of one or more overlapping the plain of the pouch type secondary battery according to one embodiment of the invention the electrode tab and the electrode lead welded configuration.
[40]
5 is a conceptual diagram showing the way and then the pouch-shaped overlapping configuration of the same one or more of the uncoated portion of the electrode tab of the electrode before applying the secondary battery (a), (b) configured in accordance with one embodiment of the present invention.
[41]
6 is a conceptual diagram illustrating a two-way and then the pouch-shaped overlapping configuration of the positive electrode tab, one or more of the uncoated portion of the electrode of the secondary battery before application (a), (b) configured in accordance with one embodiment of the present invention.
[42]
7 is a conceptual view showing a pouch-shaped two-way configuration of the negative electrode stacked one over the coated portion of the electrode tab overlapping the electrode of the secondary battery before application (a), then (b) configured in accordance with one embodiment of the present invention.
[43]
8 is a conceptual view showing a cross-sectional shape of the pouch type secondary battery unit pitch pattern during welding of the electrode tab.
[44]
Figure 9 is a conceptual diagram of cross-sectional shape of the pouch type secondary battery electrode overlapping at least one of said coated portion electrode tab welding unit pitch of the pattern in accordance with one embodiment of the present invention.
[45]
10 is a conceptual diagram of a configuration for a part overlapping one or more of the plain of the electrode of the pouch type secondary battery according to an embodiment of the present invention of welding an electrode tab and the electrode lead.
[46]
Figure 11 is an embodiment when welding the pouch-shaped part overlapping one or more of the plain of the electrode of the secondary battery, the electrode tab and the weld structure of the electrode lead according to the welding defect rate and the tensile strength test results of the present invention.
Mode for the Invention
[47]
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.
[48]
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, means that may further contain other components.
[49]
According to the invention in the drawings will be described as in the detailed embodiment.
[50]
1 is a view of the electrode tab and the electrode lead welding portion of a conventional pouch type secondary battery.
[51]
The pouch type secondary battery to improve the lead-line using a sheet metal according to the present invention is formed so that the sealing body electrode by the pouch to be a positive electrode tab and negative electrode tab drawn out to the upper outside of the pouch a pair of pouch-shaped cells that are side-by-side stacking, and the number of pouch-shaped cell modules included, and arranged side by side stacking the cell case is a pouch of the pouch-type cell coupled to sealing; A comprise.
[52]
The pouch-shaped cell module is formed of the pouch surrounding the outer surface of the electrode body to form the pouch body is sealed by the electrodes of the pouch-shaped cells. And it is formed such that the positive electrode tab and negative electrode tab extending to one side of the electrode member drawn out of the pouch. That is, the pouch-shaped cell is in the form composed of a positive electrode tab and the negative electrode tab to the one side thereof to said electrode member is extended, the wrapping the pouch to seal only the electrode member other than the positive electrode tab and negative electrode tab. And this is the pouch-shaped cells that are formed as side-by-side is made up of a pair of stacked, the pouch-shaped cells are bonded to the outer surface of the cell case is bonded to the pouch is sealed.
[53]
That is, the portion enclosed in the pouch with the exception of the positive electrode tab and negative electrode tab of the pouch-shaped cells surrounded by the cell back into the case is closed by the cell case. At this time, the cell case is preferably formed does not adhere to the pouch so as to be a certain space in the inside.
[54]
The pouch-shaped cell module is formed such that the positive electrode tab and the negative electrode tabs drawn out to the outside of the cell case to one side, the electrode unit is enclosed by said pouch, again sealed by the combination of the cell case to the outside of the pouch is forms a structure that is sealed into 2.
[55]
At this time, the electrode member of the pouch-shaped cell is composed of a separator separating the positive electrode, negative electrode, electrolyte and the anode and the cathode is part electricity is charged and discharged, the positive electrode tab and the negative electrode tab upon discharge from said electrode member generated or a part for passing the current flowing during charging from the outside.
[56]
Pouch-shaped cell module that is formed as described above is configured to be a dog stacked side by side, the positive electrode tab or negative electrode tab is drawn out to the outside of the cell case is a pair of a positive electrode tab of a pouch-type cell module bonded and the negative electrode tab is combined negative taepwa the pouch-shaped cell modules adjacent to each other may be connected in series or in parallel.
[57]
At this time, the positive electrode tab and the negative electrode tab is coupled using a connector or a connection plate or the like, or may be bonded by laser or ultrasonic welding. The present invention is one made in view of solving the disconnection phenomenon generated in the welded portion in which the positive electrode tab and the negative electrode tab and the positive electrode lead and negative electrode lead welding.
[58]
2 is a conceptual diagram showing the electrode tab and the electrode lead welded structure of a conventional pouch type secondary battery.
[59]
Ultrasonic welding machine, also provide for the, welding a plurality of electrode tabs and the electrode lead of the electrode assembly as shown in Figure 2, ultrasonic greatly horn (horn) and, in conjunction with the anvil (anvil) and a horn vibrates the horn It comprises an actuator.
[60]
Here, the electrode tab is composed of a plurality of negative electrode tabs that extend from the plurality of positive electrode tabs and a plurality of negative plates which are extended from the plurality of positive electrode plates of the electrode assembly. The horn is electrically connected to the ultrasonic actuator, and transmits the vibration caused by the ultrasonic actuator to the anvil.
[61]
The anvil is provided adjacent to the horn, it serves to support the weld such that the weld can be welded (a plurality of positive electrode tabs and the positive electrode lead or a plurality of the negative electrode tab and the negative electrode lead).
[62]
In the ultrasonic welding horn is an ultrasonic welding horn (sonotrode horn) for applying ultrasonic vibration to the welding object that is supported by the anvil (anvil) of the present invention, the ultrasonic welding horn, the vibration applying plate and the vibration applied at least on the plate 1, but having at least a protruding unit pitch horn pattern on which a pattern is formed area is disposed, is disposed in the outer portion of the horn pattern area is characterized in that the side of the unit pitch pattern is exposed to the outside rounded.
[63]
In the present invention the surface area in which the projected pattern to the vibration applied from the ultrasonic welding horn formed structure it will be described with defined as the horn pattern area.
[64]
3 is a plan view showing the structure of the horn pattern area in accordance with the present invention.
[65]
The horn pattern area is formed of a structure in which a plurality of unit pitch pattern is arranged, it said unit pitch pattern is provided with a protrusion pattern having a shape basically attached. In addition, the horn pattern region can be divided into units of a pitch pattern is disposed in places that are not next to each other and the unit pitch pattern and the external portion is disposed adjacent to the outer region.
[66]
In the present invention, in order to solve the problem that due to the sharpness of the edges of a crack generated in the welded object if the corner portion of the unit pitch pattern is implemented as a very sharp shape, ultrasonic welding the lead portion and the tab of the secondary battery, It characterized by rounding the corners of the unit pitch pattern. Here, "rounding" refers to a concept that encompasses all the way to implement the edge of the unit pitch pattern in the image has a constant curvature.
[67]
4 is a conceptual diagram illustrating a portion of one or more overlapping the plain of the pouch type secondary battery according to one embodiment of the invention the electrode tab and the electrode lead welded configuration.
[68]
The present invention is configured by laminating an electrode uncoated portion of the electrode tab overlapping part at least one of said solid electrode tabs having the same electrode, each of the area designed to split in half in order to on the electrode when stacked on the positive electrode or the negative electrode. Thus the number of electrode tabs to be welded between the solid portion of each electrode according to the reduction to 1/2, it developed a novel multi-electrode terminal tab which greatly improves the disadvantages of the electrode shape and thus improve the efficiency of the welding.
[69]
There are uncoated portion of the electrode tab, the same electrode laminated in plurality may be formed one or more. Overlapping part at least one of said solid electrode tab are spaced apart by a predetermined distance may be coupled to the electrode lead.
[70]
The uncoated portion electrode tab (+) pole and (-), and poles can be formed on the one-way electrode tabs are formed at the same direction of the electrode assembly, a (+) pole and (-) poles, respectively in the opposing direction of the electrode assembly may be formed in the two-way electrode tabs are formed. Thus, uncoated portion of the electrode tab-electrode lead coupling to be formed is also limited to be apparent. I.e. even if uncoated portion electrode tab is formed of a plurality of a plurality of uncoated portion of the electrode tabs having the same electrode is coupled to a single electrode lead of the same electrode. Constant distance from the scope of the addition electrode uncoated portion tab, it is obvious it can not escape the width of a single electrode lead to be welded.
[71]
The electrode tab is stacked in all the four directions is possible cell is apparent.
[72]
If the uncoated portion intended to limit the number of the electrode tabs to secure the half cell capacity and output a desired aliquot of the same electrode can not overlapped portions at least one of said solid electrode tab of the adjustment is possible is evident.
[73]
[0068] Compared with two identical output capacity, the thickness of the coated portion electrode tab for implementing (T t For a) the 4 one embodiment of the present invention, through an alternating stacked electrode structure, the weld thickness of the electrode tab It can be reduced to 1/2, thereby reducing the damage to the coated portion during welding the electrode tabs.
[74]
Embodiment, problems such as the case of conventional multi-layer folding of the battery cell, the positive electrode sheet 29 and negative electrode 28: laminated can more damage and break of the welding electrode tab of the electrode tab to the occurred.
[75]
In particular, Figure welding of the upper end electrode tabs to the ultrasonic welding of the two is the depth of the horn tip can deepen severe damage. Desorption increased potential due to damage of such a top weld and also increases the non-welded defects likely due to the increase in weld thickness for the bottom electrode tab welded.
[76]
Further, in the high energy welding need for thick welded portion even when the electrode lead-bus bar welding of the battery pack process, and, at this time, a weakly-welding from the inside of the battery cell electrode tab welded upper and lower end portions cause additional desorption problem by welding damage can.
[77]
Secondary battery has the electrode terminal of the one-way type is that after the positive electrode and the negative electrode tab of the electrode assembly formed in the same direction, the electrode lead is connected to the electrode tabs to form a terminal electrode. For one-way cell due to the non-uniformity of the active material used in the electrode lead and the heat generating side of the cell during charging and discharging there is a disadvantage that a good life.
[78]
Electrode terminal of the two-way type is that the positive electrode and the negative electrode tab of the electrode assembly then formed on the opposing face of the electrode assembly, the electrode lead is connected to the electrode tabs to form a terminal electrode. For two-way cell case to construct a battery pack, thereby to take up more space than a one-way cell has the disadvantage that the energy density falling.
[79]
Was the case of the battery cell and the electrode leads are formed in one direction, due to the non-uniformity of the active material used in the electrode cell in the heating and charging or discharging of the electrode lead side will have an adverse effect on the life, in the case of the battery cell and the electrode leads are formed in both directions , take up more space than a one-way packaging during cell because there is a problem in that the energy density falling.
[80]
5 is a conceptual diagram showing the way and then the pouch-shaped overlapping configuration of the same one or more of the uncoated portion of the electrode tab of the electrode before applying the secondary battery (a), (b) configured in accordance with one embodiment of the present invention.
[81]
6 is a conceptual diagram illustrating a two-way and then the pouch-shaped overlapping configuration of the positive electrode tab, one or more of the uncoated portion of the electrode of the secondary battery before application (a), (b) configured in accordance with one embodiment of the present invention.
[82]
5 and the electrode tab uncoated portion applied area of ​​the electrode while maintaining the extent of the same electrode tab width (Tw) the application area of ​​the electrode tab of the electrode is an existing yangbunhwa to 1/2 As can be seen in FIG.
[83]
5 and the first negative electrode tab and the second negative electrode tab in the form of the same electrode uncoated portion electrode tab of such as in Figure 6 (b) the existing first negative electrode tab with the first electrode tab, the first electrode tab and the second anode to prepare an electrode design tab.
[84]
By reducing the number of the electrode tabs and the welding layer thickness to be welded by laminating two electrode sequentially to 1/2 can improve the welding performance and improve the welding yield.
[85]
7 is a conceptual view showing a pouch-shaped two-way configuration of the negative electrode stacked one over the coated portion of the electrode tab overlapping the electrode of the secondary battery before application (a), then (b) configured in accordance with one embodiment of the present invention. Between the electrodes can be described, but there is also a separator for the positive electrode and the isolated position corresponding to the anode, it has been omitted to better understand the concept of the coated portion of the negative electrode tab, which are stacked alternately. Additionally, the positive / negative electrodes of the layered structure of the electrode is the anode size for direct short circuit protection is less than the anode, a separator between the amount of positive / negative is apparent that the negative electrode is larger than that applied. Thus, consider the alternate is solid weld characteristics for the left / right level difference occurs in the electrode tab, which in the physical electrode configuration, and, in order to weld them as shown in FIG. 10, by modifying the shape of the negative electrode lead, the flexibility of the step to give, it is possible to improve the welding yield. Alternatively, with respect to the horn (horn) and anvil (anvil) of the ultrasonic welding device, uncoated portion applies the stepped design considering the left / right difference in level of the electrode tab, and welding the two sides at the same time, or left / right, respectively of by welding the electrode tabs individually can improve the welding yield.
[86]
8 is a conceptual view showing a cross-sectional shape of the pouch type secondary battery unit pitch pattern during welding of the electrode tab.
[87]
Figure 9 is a conceptual diagram of cross-sectional shape of the pouch type secondary battery electrode overlapping at least one of said coated portion electrode tab welding unit pitch of the pattern in accordance with one embodiment of the present invention.
[88]
In the case of new cathode laminated, coated portion can be placed a certain distance from consideration of the electrode tab stop dispensing when stacked to prevent thickness increase due to the stacking of the electrode tab. In this case, the stacking of the electrodes of the same polarity, there is no short circuit occurs due to possible contact with the electrode tab portion.
[89]
In addition, a reduced number of welding stack to control the tip sharpness (Tip sharpness) of the horn unit pitch pattern, it is possible to ease the welding condition.
[90]
In the ultrasonic welding horn for welding the uncoated portion of the electrode tab of the electrode stack in the same plurality, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; Inclusion and, as the outer shell portion of the horn pattern area increase in the number of divided portions of the solid electrode tabs, the side surface of the protruding unit of the pitch pattern are rounded may be carried out the welding.
[91]
In the ultrasonic welding horn for welding the uncoated portion of the electrode tab of the electrode stack in the same plurality, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; Inclusion and, as the outer shell portion of the horn pattern area increase in the number of divided portions of the solid electrode tab, the tip sharpness (Sharpness) of the convex unit of the pitch pattern is decreased may be carried out the welding.
[92]
The form of the horn tip portion of Figure 3 means that no change in the form as large rhombus shape reduces the sharpness of the tip as the increase in the number that is the horn-shaped conventional rhombus shape dividing the electrode tab.
[93]
The protruding unit pitch if the pattern portions the solid for welding the electrode tabs and / or contact with the electrode lead, as the solid portion increases the number aliquot of the electrode tab, wherein the protruding unit pitch pattern portion the solid electrode tab, and / or the radial contact with the inside of the protruding unit pitch pattern to form the electrode lead (r h may be formed so) to increase.
[94]
10 is a conceptual diagram of a configuration for a part overlapping one or more of the plain of the electrode of the pouch type secondary battery according to an embodiment of the present invention of welding an electrode tab and the electrode lead.
[95]
For the negative electrode because it is based typically electrode leads are nickel increases the mechanical strength more difficult to weld, and in this case, in Fig. 10 (c) to the alternating lamination and electrode bisects the negative electrode uncoated portion electrode tab, such as (d) reducing a thickness of 1/2, when applying this occurs when a new type of negative electrode lead tab, considering a step of, and may be the flexibility is given to the welding line significantly poor.
[96]
For the anode to facilitate the welding system since the electrode lead of aluminum, it may be applied as a conventional positive electrode tab form as shown in (a) of Fig. And, as in the case of the above-described negative electrode even when the positive electrode, it is apparent that can be applied to form a new electrode.
[97]
(Example)
[98]
For new electrode proposed in the present invention, each occurrence of a level difference as between the electrodes because the thickness of stacking a different electrode tab. However, the thickness is tens to hundreds of μm level, because it had a line thickness to be welded to 1/2, but the big problem does not occur with respect to the previous level Welding Process, weld defects such as about the difference between the thickness of the step It may occur.
[99]
In the present invention, by a new design from the lower-electrode lead is welded in the form of electrode tab terminal, and dropped the flexibility (Flexibility) the electrode lead welded portion with respect to the electrode level difference to be welded, the weld defect rate was improved further.
[100]
Figure 11 is an embodiment when welding the pouch-shaped part overlapping one or more of the plain of the electrode of the secondary battery, the electrode tab and the weld structure of the electrode lead according to the welding defect rate and the tensile strength test results of the present invention.
[101]
The embodiment of Figure 11, Example 2, Fig. 10 (c) the lower end of the conventional electrode lead depth (L as in the case of d1 were correcting step for welds between emitted by the other), solid negative electrode tab. Actual case of a car battery, the electrodes emitted take a lower end thickness of the lead thicker because the flexibility is dropped even depth (L the lower end as in the Example 3 10 (d) is also a 11 d2 after the other by a) antiperspirant, protected by changing the film of PP film applicable areas, and improving the welding performance of a couple of stepped portions additional flexibility.
[102]
The more the punching depth (Ld) of the electrode lead deep flexibility because there is silring (sealing) properties for the purpose of increase in a sealed pouch can be lowered to be punched to an appropriate depth.
[103]
Those of ordinary skill in the art that the present invention it will be possible to perform a variety of applications and modifications within the scope of the invention as disclosed in the accompanying claims.
[104]
100: cell
[105]
110: upper pouch
[106]
120: electrode assembly
[107]
121: a first electrode tab
[108]
122: The first negative electrode tab
[109]
123: Protective film
[110]
124: positive electrode lead
[111]
125: negative electrode lead
[112]
126: weld
[113]
127: second electrode tab
[114]
128: second anode tab
[115]
129: Other studies
[116]
130: lower pouch
[117]
200: Ultrasonic welding
[118]
210: ultrasonic actuator
[119]
220: Horn
[120]
221: vibration applying plate
[121]
222: unit pitch pattern
[122]
223: Tips
[123]
230: Anvil
Industrial Applicability
[124]
As it described above, according to the secondary battery including the secondary battery electrode, and it characterized in that the uncoated portion electrode tab of the same electrode stacked in plurality in accordance with the present invention is formed at least one, generated during the welding of the electrode tab composed of a plurality of there is an effect that it is possible to exclude the disconnection.
[125]
In addition, the present invention is effective to equalize the welding time and the amplitude can be pressurized welding.
[126]
The invention also emitted other the lower end so that the section solid of the same electrode stack of a plurality portions the solid to the lower end of the electrode lead is welded to the electrode tab corresponding to the electrode tab, it is possible to improve the flexibility of the secondary battery, the electrode level difference .
[127]
Further, this is because the uncoated portion of the electrode tab, the same electrode stack of a plurality of the present invention to form a reduced thickness of the coated portion electrode tab to reduce the ultrasonic welding horn tip sharpness is effective to reduce the weld defect rate.

Claims

[Claim 1]A secondary battery electrode, characterized in that the uncoated portion of the electrode tab of the electrode stack in the same plurality is formed at least one.
[Claim 2]
The method of claim 1, wherein the one or more portions overlapping the solid electrode tab is a secondary battery electrode characterized in that the spaced apart at a predetermined distance coupled to the electrode lead.
[Claim 3]
3. The method of claim 2, wherein the one or more solid sub-electrode tab is a secondary battery electrode characterized in that the coupling without departing from the width of the electrode lead.
[Claim 4]
The method of claim 1, wherein the thickness of the same electrode uncoated portion the electrode tabs of the laminate into a plurality (T t ) is the secondary battery electrode characterized in that the decrease in inverse proportion to the number that the uncoated portion of the divided electrode tabs overlap.
[Claim 5]
The secondary battery electrode, characterized in that formed to according to item 1, wherein the one or more portions overlapping the solid electrode tabs are alternated to overlap.
[Claim 6]
The method of claim 2, wherein the uncoated portion the lower end of the electrode lead is welded to the electrode tab is formed of a secondary battery electrode, characterized in that emitted by the other said predetermined distance.
[Claim 7]
The method of claim 6, wherein the length of the punching from the lower end of the secondary cell electrode, characterized in that it can be extended to the insulating tape area.
[Claim 8]
The method of claim 1, wherein the electrode stack of a plurality of identical uncoated portion in the ultrasonic welding horn for welding the electrode tabs, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; The, outer shell of the horn pattern area portion includes a secondary battery electrode characterized in that the side surface of the protruding unit of the pitch pattern are rounded with increasing the number of divided portions of the solid electrode tab, to proceed with the welding.
[Claim 9]
The method of claim 1, wherein the electrode stack of a plurality of identical uncoated portion in the ultrasonic welding horn for welding the electrode tabs, the vibration applying plate; The vibration applying horn protruding unit pattern area in which the pitch pattern is formed is arranged at least one on the plate; The inclusion, and outer portion of the horn pattern region secondary battery, characterized in that with increasing number of aliquot of the uncoated portion electrode tab, the tip sharpness (Sharpness) of the convex unit of the pitch pattern is reduced to proceed with the welding electrode.
[Claim 10]
Claim 8 or claim 9, wherein when the protruding unit pitch pattern is in contact with the uncoated portion the electrode tabs and / or the electrode lead for the welding, said as the solid portion increases the number aliquot of the electrode tabs, raised unit pattern pitch radius (r in contact with the inside of the protruding unit formed pitch pattern with the uncoated portion the electrode tabs and / or electrode lead h secondary cell electrode, characterized in that that may be formed so as to be increased).
[Claim 11]
Claim 8 or claim 9, wherein the secondary cell electrode of the protruding unit pitch pattern is characterized in that the semi-spherical projection pattern having a side wall curvature.
[Claim 12]
Any one of claims 1 to 9, according to any one of items, the secondary battery including the secondary battery is a secondary battery electrode characterized in that the jelly-roll or stacked-layer type.
[Claim 13]
The method according to any one of the preceding claims, the device comprising: a secondary battery including the secondary battery electrode.
[Claim 14]
14. The method of claim 13, 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.