1]The present invention is a secondary battery electrode, relates to a method of manufacturing the electrode assembly and, more particularly, to a secondary cell electrode, a method for their preparation and the electrode assembly to improve the stability of the secondary battery.
[2]BACKGROUND
[3]Recently, a secondary battery can be charged and discharged has been widely used as an energy source for wireless mobile devices. Further, the secondary battery electric vehicle (EV), which is presented as a method for solving such as air pollution, such as conventional gasoline vehicles and diesel vehicles using fossil fuel, a hybrid electric vehicle (HEV), plug-in hybrid electric vehicle It has attracted attention also as a power source, such as (Plug-in HEV).
[4]
The small mobile device, one device per one or a couple of battery cells are used as opposed to, the middle- or large-sized devices, such as automobiles, because of the need for high-output, large-capacity, the middle- or large-sized battery module by electrically connecting a plurality of battery cells are used.
[5]
The middle- or large-sized battery module is so desirable when produced by the small size and weight is possible, can be alluvial a high density capacity compared to weight a small prismatic battery, a pouch-type battery or the like is mainly used as a battery cell (unit cell) of the middle- or large-sized battery module have. In particular, the aluminum pouch-shaped battery using a laminate sheet such as an external member has attracted recent interest due to advantages such as that the weight is small and production cost is low and the form of modification is easy.
[6]
The electrode assembly of such a secondary battery manufacturing method has a number of reasons. The technique most commonly used is of the jelly to the take-up with a separator interposed between the positive electrode, a negative electrode and an anode and a cathode - is a technique to make a roll (Jellyroll) form. However, such a jelly-roll type electrode assembly is therefore to create a long sheet-like positive electrode and the negative electrode in a structure of cylindrical or elliptical in cross section by winding a dense state, a stress caused due to expansion and contraction during charging and discharging electrode electrode is to be accumulated in the assembly, is deformed, such as those stresses accumulate over written cracks of the electrode assembly to a certain limit. In a variation of such an electrode assembly, the performance of the battery is drastically reduced resulting in a problem that the safety of the battery threatened due to the internal short-circuit.
[7]
(Prior art document)
[8]
Korea Patent Publication No. 10-2015-0054702
[9]
Detailed Description of the Invention
SUMMARY
[10]
The present invention provides a secondary cell electrode, a method for their preparation and the electrode assembly to prevent deformation of the current collector to relieve the pressure applied to the current collector, and prevented that the electrode produced when the crack is generated.
[11]
Problem solving means
[12]
Secondary cell electrode according to an embodiment of the present invention, the current collector is formed, extending in one direction; A first active material layer formed on one surface of the current collector, including a first inclined portion and the first projection; And a second active material layer which is formed on the entire surface of the house, and a second inclined portion and the second projecting portion; the second protrusions are not facing the first angled portion as the center of the current collector, containing the the position on the second active material layer is controlled to be formed at the position.
[13]
The second protrusions may be spaced apart a predetermined interval from the second inclined portion.
[14]
The collector of the one surface may be added to provide a solid that is not the first active material layer formation.
[15]
The first inclined portion and the first projecting portion is at a side of the first formed on one side of the first active material layer, the second inclined portion and the second projecting portion and the second active material layer in the same direction as the one side of the first active material layer It can be formed.
[16]
The first active material layer and the second active material layer may be formed of the electrode active material for the negative electrode, it may be formed of a positive electrode active material for an electrode.
[17]
[18]
In addition, the process of method of manufacturing the secondary battery electrode according to an embodiment of the present invention, providing a first full house the first active material layer is formed including the inclined portion, and a first projection on one side; Process for transporting the current collector in one direction; And a second active material layer forming a comprising a second inclined portion by applying a second electrode active material and the second projection on the entire other surface of the current collector; in the process of forming the second active material layer contains the first 2 a projection is located on the second active material layer to be formed at a position that is not opposite to the first angled portion as the center of the current collector is controlled.
[19]
In the process of forming the second active material layer, the second protrusion may be formed such that a predetermined distance away from the second inclined portion.
[20]
The collector of the one surface may be added to provide a solid that is not the first active material layer formation.
[21]
The position of the second projecting portion can be controlled by adjusting the applied pressure of the second electrode coating portion.
[22]
The position of the second projecting portion can be controlled by controlling the conveying speed of the current collector.
[23]
[24]
The electrode assembly according to an embodiment of the present invention includes a positive electrode, a negative electrode and an electrode assembly separator having a winding which is interposed between the positive electrode and the negative electrode, at least one of the positive electrode and the negative electrode is any one of the secondary cell electrode described above It includes.
[25]
Effects of the Invention
[26]
According to the secondary cell electrode, a method for their preparation and electrode assembly according to an embodiment of the present invention, mainly the current collector to the inclined portion and the non-opposing position of the first active material layer controlling the position of the protrusion formed in the second active material layer by, it is possible to relieve the pressure applied to the current collector to prevent deformation of the entire home, prevented that the electrode produced when the crack is generated.
[27]
Further, according to an embodiment of the present invention controls the first active material layer and the shape of the second active material layer which are respectively formed on both sides of the house so as not to increase the thickness of the electrode rapidly, to obtain a secondary cell electrode with a uniform thickness may be, it is possible to enhance the product stability, economic efficiency and yield.
[28]
Brief Description of the Drawings
[29]
1 is a view showing the appearance of a typical secondary cell electrode.
[30]
2 is a view showing the state that the pressure to the current collector is in general a secondary battery electrode.
[31]
Figure 3 is a view showing the position of a crack in the current collector in a typical secondary cell electrode.
[32]
Figure 4 is a view of the plastic strain of the collector in a common secondary cell electrode.
[33]
5 is a view showing the state of the secondary cell electrode according to one embodiment of the present invention.
[34]
6 is a view showing the state of the secondary cell electrode according to another embodiment of the present invention.
[35]
7 is a view showing the state that the pressure is applied to the collector electrode in a secondary battery according to an embodiment of the invention.
[36]
Figure 8 is a view of the plastic strain of the collector electrode in a secondary battery according to an embodiment of the invention.
[37]
Mode for the Invention
[38]
With reference to the accompanying drawings will be described embodiments of the present invention; However, the present invention is not limited to the embodiments set forth herein. Rather, be embodied in many different forms, but the embodiment of the present invention are also the teachings of the present invention to complete, and the scope of the invention to those of ordinary skill the will be provided to fully inform. Same numerals in the drawings refers to the same element.
[39]
[40]
The small mobile device, one device per one or a couple of battery cells are used as opposed to, the middle- or large-sized devices, such as automobiles, because of the need for high-output, large-capacity, the middle- or large-sized battery module by electrically connecting a plurality of battery cells are used.
[41]
The middle- or large-sized battery module is so desirable when produced by the small size and weight is possible, can be alluvial a high density capacity compared to weight a small prismatic battery, a pouch-type battery or the like is mainly used as a battery cell (unit cell) of the middle- or large-sized battery module have. In particular, the aluminum pouch-shaped battery using a laminate sheet such as an external member has attracted recent interest due to advantages such as that the weight is small and production cost is low and the form of modification is easy.
[42]
The electrode assembly of such a secondary battery manufacturing method has a number of reasons. The technique most commonly used is of the jelly to the take-up with a separator interposed between the positive electrode, a negative electrode and an anode and a cathode - is a technique to make a roll (Jellyroll) form. Here, the electrodes such as the positive electrode and the negative electrode included in the electrode assembly of a secondary battery includes a step of forming an electrode active material layer on the current collector. In this step of forming the same electrode active material layer is removed and the solution with water present in the process and, by drying an active material slurry is applied to the collector electrode active material slurry to an electrode active material particles are coated with the active material slurry sprayed into the binder solution to the current collector by including the step of forming an electrode active material layer on the current collector.
[43]
Active material slurry has the physical nature of high viscosity. Thus, in as on the collector to form an electrode active material layer is defined as a drag area is added to form the slope which is sharply generated at the leading end of the coating zone, is defined as balcony areas produced convexly a predetermined distance spaced apart position from the inclined portion is presented projections are formed.
[44]
[45]
1 is a diagram showing the appearance of a general secondary battery electrode, and Figure 2 is a diagram showing the state that the pressure to the current collector is in general a secondary battery electrode. In addition, Figure 3 is a view a view typical secondary battery indicating the position of a crack in the current collector in the electrodes, Figure 4 is showing the plastic strain of the collector in a common secondary cell electrode.
[46]
Referring to Figure 1 to 4, the first active material layer to one side of the whole 100, home extending in one direction for a typical secondary cell electrode includes a first inclined portion 210 and the first protrusion 220 the 200 is formed. In addition, the second electrode coating portion 300 to the other surface of current collector 100 has a second inclined portion 310 and the second protrusion 320 is formed. Here, the ramp means that the drag zone is sharply generated at the leading end of the coating zone, as described above, and projection means balcony area that is generated to be convex in a predetermined interval from the position inclined portion.
[47]
Jelly-roll cell having an electrode assembly of a type to form a first active material layer solid 200 that is not a service unit (N) on one side of the whole 100, home to ensure the stability of the wound. However, in this way in the case of forming the first active material layer 200 coated portion (N) is not provided on a surface of a body (100) house and forming the second active material layer 300 on the other surface of the body (100) house the second protrusion 320 of the first active material layer the first inclined portion 210, the second electrode coating portion 300 faces the area in which the 200 is positioned.
[48]
In this way, the first active material layer 200 of claim When the second projection 320 of the second active material layer 300 is located in the area opposite to the first inclined portion 210, a second active material layer 300 of the It becomes the second protrusions 320, an electrode thickness of the region in which the position suddenly thick, whereby the area is to the rolling reduction ratio is increased locally the deformation of the body (100) house occurs. That is, as illustrated in Figure 2, the first active material layer 200 and the home between the two active material layers 300 is full (100) but maintains a thickness of approximately 16.7㎛, the first active material layer 200 the first is opposed to the inclined portion 210, the second active material, the second projection 320 is located, the collector region 100 to the layer 300, it can be seen that the deformation occurs to a thickness of about 12.8㎛ .
[49]
Also, in general, home to the extending direction of the body (100), the first active material layer 200 coated portion is not available (N) on one surface of the collector 100 according to a predetermined length from an end of the body (100) house form (Fig. 2 to 4, plain portion is formed to a length of 13mm) is. In this case, the electrode length, as shown in Figure 3, that is, the electrode thickness, including from the point where a length of 0mm from the collector end of the first active material layer 200 and the collector 100 while ever increasing, solid in this region in which the position the second protrusion 320 of the unit through the second electrode coating portion 300, the first electrode coating portion 200, beginning with the first inclined portion 210 is formed. Thus, the uncoated portion (N) and the second active material in the electrode length including a boundary of about 15 to 20mm of the point of the layer 300 the first active material layer 200 and the collector 100 and the second electrode coating portion (300 electrode thickness including) is sharply increased.
[50]
This due to the increase of the electrode thickness, in from the end of the current collector 100 is approximately 15 to 20mm of the point, that is, a certain area including the boundary of the uncoated portion (N) and the second active material layer 300, the local rolling rate this increases. That is, the peak value of a, the current collector 100 in the 15 to 20mm from the whole of the end collector length plastic strain (PEEQ) of the body (100) house by the increase of local rolling rate as shown in Figure 4 is from about 0.06 increased dramatically, so have the above values, so that the deformation of the body (100) generated by the house, and there is a problem in that a crack that is, disconnection occurs during take-up.
[51]
Thus, the secondary cell electrode, a method of manufacturing according to the present invention and the electrode assembly is to prevent deformation and cracking during electrode winding the electrode manufacturing process of the collector to reduce pressure collector 100 which is applied to the 100 generated that presents technical features that can be prevented in advance.
[52]
[53]
5 is a view showing the state of the secondary cell electrode according to one embodiment of the invention, Figure 6 is a view showing a state of a secondary battery electrode according to another embodiment of the present invention.
[54]
5 and 6, the secondary cell electrode according to an embodiment of the invention the total 100 house extending in one direction; The current collector is formed on one surface of (100), a first electrode coating portion 200 including the angled portion 210 and the first projection (220); And is formed on the other surface of the collector 100, the second inclined portion 310 and the second protrusion 320, the second active material layer 300 comprising a;, and includes the second protrusion 320 the home around the body (100) is located on the second active material layer 300 to form a position that is not opposite to the first inclined portion 210 is controlled.
[55]
Here, the first inclined portion 210 and the first projection 220 is first formed on one side of the first active material layer 200, the second inclined portion 310 and the second protrusion 320 includes a first electrode coating portion ( 2 is formed on one side of the active material layer 300, which is located in the same direction as the one side of 200). That is, FIG. 5 and as shown in FIG. 6 illustratively shown on the first inclined portion 210 and the first projection 220 may be formed on the left side of the first active material layer 200, a second inclined portion ( 310) and the second protrusion 320 may be formed on this left side of the same in the second electrode coating portion 300 direction.
[56]
Jelly, as described above - the battery having an electrode assembly of a roll type to form a first active material layer 200 coated portion (N) is not provided on a surface of a body (100) home in order to ensure the stability of the take-up . However, in this way in the case of forming the first active material layer 200 coated portion (N) is not provided on a surface of a body (100) house and forming the second active material layer 300 on the other surface of the body (100) house the second protrusion 320 of the first active material layer 200, the first inclined portion 210 and the opposing area, the second active material layer 300 of the positioned a problem of localized rolling rate increase and cracks there was. Thus, the secondary cell electrode according to an embodiment of the present invention the second active material layer 300, the second protrusion 320, the first being around the full 100 house formed in the first active material layer 200 is contained in the position on the second electrode coating portion 300 is controlled so as to form a non-facing position and a ramp (210).
[57]
Here, the uncoated portion (N) is a home along the extending direction of the body (100) may be formed to have a length of 10 to 20mm, the first inclined portion 210 is pointed to the end of the first active material layer 200 means that the drag zone is formed in a shape, and the second inclined portion 310 refers to the drag zone is formed in a sharp shape to the end portion of the second active material layer 300.
[58]
As in the embodiment of the invention, the second active material layer 2 the first inclined portion 210, which includes a projection 320 on the first active material layer 200 around the entire 100 house included in the 300 in the case of forming the non-facing position and, in the end that is the first inclined portion 210 of the first electrode coating portion 200 is not rapidly changing the electrode thickness. That is, formed on the first inclined portion 210 and the second that with respect to the problem that the electrode thickness abruptly changed by the protrusion 320, not opposite to the second protrusion 320, the first inclined portion 210 located thereby, the first region of the inclined portion 210 is the only change in the thickness of the electrode by the first inclined portion 210, it is possible to prevent a rapid change in electrode thickness.
[59]
5 is a diagram showing a state of a secondary cell electrode according to one embodiment of the invention, a second projection (320) contained in the active material layer 300 is in the position opposite to the first inclined portion 210 It is formed by going to the end side (left side on the drawing) of the collector (100). Thus, it is possible to prevent that suddenly changes electrode thickness in a region opposite to the first inclined portion 210, which results locally rolling rate sharply by the first inclined portion 210 and the second protrusion 320 prevents the increase in it is possible to prevent the deformation and cracking of the electrode winding when the collector 100 in advance.
[60]
Further, Figure 6 is a diagram showing a state of a secondary battery electrode according to another embodiment of the present invention, a second projection (320) contained in the active material layer 300 is opposite to the first inclined portion 210 in position it is formed by going to (on the right in the drawings) opposite to the end portion of the body (100) house. That is, the second protrusion 320 is spaced apart a predetermined interval from the second inclined portion 310). Accordingly, it is possible to prevent the electrode thickness in a region opposite to the first inclined part 210 suddenly changes, as in one embodiment of the invention, Due to this first inclined portion 210 and the second protrusion It is to prevent (320) the local rolling rate drastically increased by having the effect of preventing the deformation and cracking of the collector 100 in advance is the same as described above. Here, the configuration for moving the position of the second protrusion 320 on the second active material layer will be described in detail with respect to the method of manufacturing the secondary battery electrode as follows.
[61]
[62]
Method of producing a secondary battery electrode according to an embodiment of the present invention is provided a first inclined portion 210 and the first protrusion first active material layer body (100) house (200) is formed comprising a 220 to one side process; The process of transferring the full 100 the current collector in one direction; And forming a second electrode coating portion 300 including the second active material, the second inclined portion 310 and the second protrusion 320 is applied to the other surface of the current collector (100); wherein, further comprising a in a second process of forming an active material layer 300, the second protrusion 320 and the second electrode active material to be formed at a position that is not opposite to the first inclined portion 210, around the entire 100 in the home the location on the layer 300 is controlled.
[63]
The coating apparatus is a roll (roll) forms a current collector a supply roll and a full 100 house are continuously moved in the one direction (100) continuously fed in one direction by unwinding the wound to form an active material layer followed by drying the active material slurry was coated on the coating die and the collector (100) for applying the active material slurry is supplied from external electrode active material slurry source for forming an active material layer on the whole 100, home dryer and a current collector an active material layer formed ( by winding 100) comprises a number of rolls for collecting in a roll state.
[64]
First, a process of providing a first inclined portion 210 and the first protrusion first active material layer body (100) house (200) is formed comprising a 220 to a surface is made by the above-mentioned coating apparatus, the house applying an active material slurry on a surface of a body (100), and dried to form the first active material layer 200. Here, the first electrode coating portion 200 is the collector is formed from a position spaced apart by a length of 10 to 20mm from the end of the 100 can form a coated portion (N) on one surface of (100) house, the end of the first electrode coating portion 200 has a first inclined portion 210 is formed, the second position the predetermined distance away from the first inclined portion 210 is to be formed with a first projection (220).
[65]
After this I and by the same process of forming the first active material layer 200 on one side of the whole 100, home, to form the second active material layer 300 on the other surface of the body (100) house by the above-described coating apparatus do. This process of transferring the collector (100) in one direction; And a second active material, that is a second process for forming an active material layer 300 for applying the active material slurry including the second inclined portion 310 and the second protrusion 320 on the other surface of the collector (100); a is included. A process of forming the second active material layer 300, the collector 100 to the other side of the course and the current collector (100) for feeding in one direction can be achieved by the above-mentioned coating apparatus.
[66]
In the process of manufacturing method of a secondary battery electrode according to an embodiment of the present invention forming the second active material layer 300, the second projection 320 is collector 100 which is included in the second active material layer 300 the center is controlled so as to be formed in the position that is not opposite to the first inclined portion (210).
[67]
Such positioning of the second protrusion 320 may be formed by adjusting the applied pressure of the second active material layer 300. That is, as in the other surface of the current collector 100 to form a second active material layer 300, by varying the second applied pressure of the coating die for supplying the active material slurry may control the position of the second protrusion 320 .
[68]
Here, the case of increasing the application pressure of the coating die for supplying a second active material slurry, the second projection 320 is included in the second active material layer 300, as shown in Figure 4 includes a first inclined portion 210 at a position opposite to the movement it is formed by the end side (left side in the drawings) of the body (100) house. In addition, the second current collector at a position opposed to the projecting portion 320 includes a first inclined portion 210, which is included in the second active material layer 300, when decreasing the applied pressure of the coating die for supplying a second active material slurry ( It is formed by moving to the opposite side (right side in the drawings) of the end portion 100). In addition, the second active material slurry fed to the local change in the applied pressure of the coating die can also adjust the position of the second projection 320, which as a matter of course. That is, in supplying the second active material slurry, a first lowering the applied pressure of the coating die on the position the second protrusion 320 of the first inclined portion 210, around the entire 100 house the ramp (210) and it can be controlled so as to form the non-opposing position.
[69]
As such, to control the pressure applied to the coating die can be made by controlling the valve for supplying a second active material slurry. That is, the coating die may include a valve to control the pressure in the second active material receiving portion for receiving the slurry, the nozzle and the receptacle for ejecting the second active material slurry from the receptacle portion. Here, the valve is mounted within the accommodating portion in the instance for example may consist of a rod (rod) for urging the second active material slurry received in the receiving portion. In this case, the valve may be driven by a motor. It is preferred to use: (Voice Coil Motor VCM) Thus, the voice coil motor to the motor for driving the valve is to fine-tune the pressure in, but may be an electric motor that operates by electric signals, the receiving unit. The voice coil motor is applied for supplying the to be used for fine working of below and no change of force by the position and the coil is operated in a uniform magnetic field can micrometers motor, the response speed is very fast second active material slurry coating die it is possible to fine-tune the pressure.
[70]
The position control of the second protrusion 320 may be made by adjusting the feed rate of the whole 100, home applied during the second active material layer 300. That is, on the other surface of the collector 100 of the second active material layer in forming the (300), by changing the rotational speed of the feed roll and the take-up roll for conveying the collector (100) in one direction collector 100 by adjusting the feed rate can control the position of the second projection (320).
[71]
Here, the case where in as two form an active material layer (300), decreasing the feed rate of the collector 100, the second projection 320 is included in the second active material layer 300, as shown in Figure 4 It is formed by moving the first end side (left side in the drawings) of the entire inclined portion 100 in the home position opposed to 210. Furthermore, the method as 2 forming an active material layer 300, when the second projection 320 includes a first inclined portion 210, which is included in the second active material layer 300 to increase the conveying Song of the collector 100 at a position opposite to the formed, go to (on the right in the drawings) opposite to the end portion of the body (100) house. In addition, that the feed rate of the collector 100 by a local change can also adjust the position of the second projection 320, as a matter of course. That is, as the transfer of the collector 100, the second protrusion 320, by increasing the feed rate at the position opposite to the inclined portion 210, the collector 100 is around the entire 100 house it is possible to control so as to form a position that is not opposite to the first inclined portion (210).
[72]
Electrode according to the above-described embodiments of the present invention jelly it may be used in the electrode assembly of the roll form. That is, as the membrane electrode assembly is wound, which is interposed between an anode, a cathode and an anode and a cathode, it may be at least one of a secondary cell electrode of the above-mentioned positive and negative electrodes.
[73]
[74]
7 is a view showing the state that the pressure is applied to the collector electrode in a secondary battery according to an embodiment of the invention. Here, FIG. 7 (a) is a full 100 house in the case where the projection 320 of the second active material layer 300 is located at a position opposite to the first inclined portion 210 of the first active material layer 200 to indicate a state applied with pressure, Fig. 7 (b) is not a projecting portion 320 of the second active material layer 300 is located at a position opposite to the first inclined portion 210 of the first active material layer 200 if it does not represent a state that the pressure in the collector 100 is applied.
[75]
Here, the second active material was formed in the protrusion 320 of the layer 300 to have a height and width of approximately 8mm 8㎛, a first inclined portion (210) collector (100 in the active material layer 200 ) it was formed to have a thickness of from 20㎛.
[76]
As shown in Figure 7 (a), in the case where the projection 320 of the second active material layer 300 is located at a position opposite to the first inclined portion 210 of the first active material layer 200, the first active material between the layer 200 and the second active material layer 300, the collector 100 has a thickness of approximately 13.2㎛. However, FIG. 7 (b) of this embodiment a secondary battery electrode collector 100, if according to the invention shown in is substantially brought 17.5㎛ thickness, decrease the pressure applied to the collector 100, this localized rolling rate arising therefrom can effectively know the degraded.
[77]
The plastic strain of the collector according to the same home thickness change of the entire 100 is shown in Fig. When the protrusion 320 of the second active material layer 300 is located at a position that is also in 8 parts shown by a dotted line is opposite to the first inclined portion 210 of the first active material layer 200, the total 100 house in represents a plastic strain (PEEQ), portions indicated by solid lines in Fig. 8 is a protrusion 320 of the second electrode coating portion 300 to the position opposite to the first inclined portion 210 of the first active material layer 200 if it does not indicate where the plastic strain (PEEQ) of the body (100) house.
[78]
As Figure 8 by the dotted line shown, in the case where the projection 320 of the second active material layer 300 is located at a position opposite to the first inclined portion 210 of the first active material layer 200, the current collector ( 100) house at the length of 10 to 20mm from the end of the body (100) has to by the increase of local rolling rate sharply enough to have the plastic strain (peak value of about 0.06 or more values ​​of PEEQ) of the body (100) house it can be seen that increase. However, not the projection of the second active material layer 300 is located in the first position opposite to the inclined portion 210 of the first active material layer 200 as described by the solid line in Figure 8 according to an embodiment of the invention shown that is, if it can be seen that the peak value of the plastic strain (PEEQ) to approximately 0.03 up to about 50% reduction. Accordingly, the home variant of the full 100 can be prevented, and the protrusion 320 of the first active material layer second active material layer 300 at a position opposite to the first inclined portion 210 of the 200, the position in contrast to the about 6,763K (K = 1,000) of a secondary battery electrode manufactured by the take-up electrode when the cracks are generated in the secondary cell electrode 104K of having a failure rate of about 1.54%, the first electrode active material as in the embodiment of the present invention layer 200 of the first inclined portion 210, the second active material when the projections 320 are not located in the layer 300 is manufactured 5,910K (K = 1,000) of a secondary battery at all for the electrodes at a position opposite to the It is so because a crack does not occur can be produced a secondary cell electrode as a defect rate of 0% can be prevented from occurring in that a crack occurs during electrode manufacture.
[79]
Thus, according to the secondary cell electrode, a method for their preparation and electrode assembly according to an embodiment of the invention, the second active material around the current collector 100 to the inclined portion and the non-opposing position of the first active material layer 200 by controlling the position of the protrusion formed on the layer 300, to relieve the pressure applied to the current collector 100 to prevent deformation of the collector 100, and prevented that the electrode produced when the crack is generated have.
[80]
Further, by controlling the shape of the first electrode coating portion 200 and the second active material layers 300 respectively formed on both surfaces of the collector 100 so as not to increase the thickness of the electrode dramatically accordance with an embodiment of the invention, to obtain a secondary cell electrode with a uniform thickness, and it is possible to improve the product stability, economic efficiency and yield.
[81]
[82]
In the above, although preferred embodiments of the invention described and shown using specific terms such terms are only merely intended to clarify the present invention, the embodiments and the terms the technique of the present invention, the technical idea of ​​the following claims and it that a number of modifications and changes may be made without departing from the scope is not be self-evident. The embodiment variations as described above are examples and should not be understood individually from the spirit and scope of the invention, it will have to fall within the scope of the claims.
[83]

Claims

[Claim 1]The current collector to be formed extending in one direction; A first active material layer formed on one surface of the current collector, including a first inclined portion and the first projection; And a second active material layer which is formed on the entire surface of the house, and a second inclined portion and the second projecting portion; the second protrusions are not facing the first angled portion as the center of the current collector, containing the the second active material is a secondary battery electrode that is located on the layer is controlled to be formed at the position.
[Claim 2]
The method according to claim 1, wherein the second protrusion is a secondary battery electrode that is spaced apart from the predetermined portion the second inclination interval.
[Claim 3]
The method according to claim 1, wherein the current collector has a surface wherein the secondary cell electrode to be added that one solid active material layer is not provided is formed.
[Claim 4]
The method according to claim 1, wherein the first inclined portion and the first projecting portion and the second inclined portion and the second projecting portion is formed on one side of the first active material layer, is the located in the same direction as the one side of the first active material layer secondary cell electrode formed on one side of the second electrode coating portion.
[Claim 5]
The method according to claim 1, wherein the first active material layer and the second active material layer is a secondary battery electrode that may be formed as the negative electrode active material for an electrode, formed of a positive electrode active material for an electrode.
[Claim 6]
The first inclined portion and the process of claim 1, providing a full house one active material layer is formed comprising a projection on one side; Process for transporting the current collector in one direction; And a second active material layer forming a comprising a second inclined portion by applying a second electrode active material and the second projection on the entire other surface of the current collector; in the process of forming the second active material layer contains the first 2 projection method of producing a secondary battery electrode to which the first electrode coating portion is located on the second controlled so formed at a position that is not opposite to the first angled portion as the center of the current collector.
[Claim 7]
The method according to claim 6, in the process of forming the second active material layer, the second projection method of manufacturing a secondary cell electrode to form so that a given interval away from said second inclined portion.
[Claim 8]
The method according to claim 6, the method of producing a secondary battery electrode in which the collector of the one surface, the additional solid that is not provided with the first active material layer formation.
[Claim 9]
The method according to claim 6, the position of the second projection method of manufacturing a secondary cell electrode to be controlled by adjusting the applied pressure of the second electrode coating portion.
[Claim 10]
The method according to claim 6, the position of the second projection method of manufacturing a secondary cell electrode to be controlled by controlling the conveying speed of the current collector.
[Claim 11]
As the membrane electrode assembly, the winding is located between the positive electrode, a negative electrode and the positive electrode and the negative electrode, the electrode assembly at least one of the positive electrode and the negative electrode comprises any of the secondary cell electrode of claim 1 to claim 5.