Art
[1]
The present invention relates to a battery cell is applied to the bus bars by applying a foil (foil) of a bus bar function inside the battery cell by reducing the battery cell resistance increases the output of the battery cell.
[2]
BACKGROUND
[3]
Demand of a secondary battery to an increase in technical development and demand for mobile equipment also rapidly increasing, particularly lithium secondary battery various mobile devices, a high energy density and operating voltage with excellent preservation and service life characteristics, as well as energy for various electronic devices widely used as a source.
[4]
Secondary batteries are generally cylindrical battery, a prismatic battery, and is classified as a pouch-shaped battery, among them can be stacked in high integration, a prismatic battery and the pouch-shaped battery length compared with the small width is particularly noted according to the structural features of the outer and inner a situation in receiving.
[5]
Secondary cells would contain the electrode assembly consisting of a positive electrode plate, a separator, a negative electrode plate, is used in the external connection terminal connected to the electrode assembly. At this time, the external connection terminal may be connected to one-way or two-way, and each have a positive terminal and a negative terminal of one by one. Further, when the secondary battery becomes long in the length direction is in an increase in the internal resistance of the battery cells by resistance to the foil (foil) that make up the positive and negative plates has been a problem that the output of the battery cell decreases.
[6]
Detailed Description of the Invention
SUMMARY
[7]
1, the conventional battery cell is manufactured by forming one electrode tab, the one-way or two-way in the positive and negative plates of the electrode assembly constituting the battery cell, and connect the electrode leads to the electrode tab.
[8]
The thus produced batteries, but have problems when used in a battery of a small capacity purpose, when used in middle- or large-sized battery applications using a high current, there may be a problem.
[9]
That is, in the case of a battery using where it is and required energy characteristics such as an automobile, according to the magnitude of the current through the lead increases, the increase in the resistance of the positive electrode plate and negative electrode plate in an electrode assembly constituting the battery cell, the output of the battery cell decreases do.
[10]
The present invention is an electrode assembly by distributing the current through the electrode lead connected as been made, respectively, form two electrode tabs at the positive electrode plate and negative electrode plate of the electrode assembly, and electrode tabs and bus bars in parallel in order to solve the above problems to provide a structure and a method of manufacturing the battery cell to lower the resistance of the positive and negative plates that prevents the output decrease in the battery cell, it is an object.
[11]
Problem solving means
[12]
An electrode assembly that a separator is comprising a positive electrode plate and negative electrode plate posted in between, is connected to the positive electrode plate is connected to the first electrode tab and the second electrode tab that is formed by height protruding on both ends facing in the positive electrode plate, the negative electrode plate of the negative electrode plate cell first cathode formed protruding height across the opposite tab and the second negative electrode tab, the first and second positive electrode tab and the first and at least a portion of the second negative electrode tab surrounding the electrode assembly so as to be exposed to the outer cover, corresponds to the outer surface of the positive electrode plate, are formed protruding at a position corresponding to each of the first electrode tab and the second electrode tab, the projecting portion includes a first bus that is respectively connected to the first electrode tab and the second electrode tab bar, correspond to an outer surface of the negative electrode plate, a protrusion is formed at a position corresponding to the first negative electrode tab and the second negative electrode tab, respectively, the projections being respectively connected to the first negative electrode tab and the second negative electrode tab Second bus bar, the first bus, a first anode connected to the protruding portion of the bar tab or the second positive electrode the positive electrode lead, which is connected to any one of the tabs associated with the projecting portion of the second bus bar of claim 1, the negative electrode tab or the second negative electrode tab at least a portion of the negative electrode lead and the positive electrode lead and negative electrode lead that is connected to either one, may be configured to include a pouch case for accommodating the electrode assembly and the first and second bus bar is exposed to the outside.
[13]
The first electrode tab and the second electrode tab may be formed on the positive electrode plate at both ends in parallel with any one side of the axis of the positive electrode plate.
[14]
The first negative electrode tab and the second negative electrode tabs are formed at any one side and both end portions parallel to the negative electrode plate the axis of the negative electrode plate, the negative electrode plate axis is the positive electrode plate shaft and otherwise is set disposed so as not to overlap each other are the positive electrode tab and negative electrode tab to be formed is preferred.
[15]
The first bus bar and second bus bar may be a thin plate that is arranged to be butted against each other across the electrode assembly.
[16]
The material of the first bus bar is preferably aluminum.
[17]
The material of the second bus bar is preferably of copper.
[18]
The first bus bar and the area of ​​the second bus bar is preferably no greater than the area of ​​the electrode assembly.
[19]
The positive electrode lead and the negative electrode lead may be formed in the opposite directions to each other in the longitudinal direction of the electrode assembly.
[20]
Bus according to the production method of the battery cell is applied a bar, a separator between the first negative electrode tab and the second negative electrode tab is formed, a negative electrode plate at both ends in the first positive electrode tab and the positive electrode plate and a longitudinal second electrode tab is formed at both ends in the longitudinal direction the electrode assembly preparation step of preparing an electrode assembly is interposed wrapped around the cell cover; Bus bar connection for connecting the positive electrode plate and the first bus bar in parallel with the first electrode tab and the second electrode tab, and connect the negative electrode plate and the second bus bars in parallel with the first negative electrode tab and the second negative electrode tab step; Wherein the connection to the positive electrode lead on one of the first electrode tab and the second electrode tab connected to the first bus bar, and connecting the anode lead to any one of the first negative electrode tab and the second negative electrode tab connected to the bar and the second bus lead connection method comprising; It can comprise; and case assembly comprising: a positive electrode lead and the negative lead housing the electrode assembly connected to the pouch case.
[21]
The electrode assembly preparation step, the first electrode tab and the second electrode tab are formed on opposite ends positive electrode plate in parallel with any one side of the positive electrode plate axis, the first negative electrode tab and the second negative electrode tab may be any of the negative electrode plate a back side and formed on both ends of the axis parallel to the negative electrode plate, the negative electrode plate axis is set different from the positive electrode plate and the shaft can be prepared are placed so as not to overlap each other are the positive electrode tab and negative electrode tab.
[22]
Bus bar connection phase, the first bus bar and second bus bar is preferably a thin metal plate which is disposed across the electrode assembly.
[23]
The first bus bar and the second area of ​​the bus bar may be formed not greater than the area of ​​the electrode assembly.
[24]
Effects of the Invention
[25]
A battery cell according to the present invention can be used with no change of the conventional module or pack structure prevents the output decrease in the battery cell.
[26]
Brief Description of the Drawings
[27]
1 is a perspective view schematically showing the electrode tab of the conventional electrode assembly.
[28]
2 is a perspective view roughly showing that the electrode tabs are formed in the electrode assembly in the battery cell according to the present invention.
[29]
Figure 3 is a perspective view showing the connection of the bus bar in the battery cell according to the present invention.
[30]
Figure 4 is a perspective view showing the joining of the electrode lead from the battery cell according to the present invention.
[31]
5 is a perspective view of a battery cell case is a pouch according to the present invention is applied.
[32]
Figure 6 is a flow chart illustrating a method of manufacturing a battery cell according to the present invention.
[33]
※ the appended drawings is balhimyeo that illustrated by reference to the understanding of the technical spirit of the drawings, to which is not the scope of the present invention limited by it.
Best Mode for Carrying Out the Invention
[34]
Herein and in the terms or words used in the claims is general and not be construed as limited to the dictionary meanings are not, the inventor can adequately define terms to describe his own invention in the best way It can be on the basis of the principle, which must be interpreted based on the meanings and concepts corresponding to technical aspects of the present invention.
[35]
Thus embodiments the configuration shown in the examples and figures disclosed herein is merely nothing but a preferable one embodiment of the present invention, in not intended to limit the scope of the present invention, that can be made thereto according to the present application point it should be understood that various equivalents and modifications could be. In addition, when the known technologies involved in the following description of the present invention is determined that can blur the point of the present invention, the detailed description thereof will be omitted.
[36]
[37]
2 is a perspective view showing the connection of the bus bar in the battery cell due to the 3 invention, a perspective view roughly showing the that formed the electrode tab from the electrode assembly in the battery cell, even according to the present invention, Figure 4 is a battery of the present invention a perspective view of the joining of the electrode lead in the cell.
[38]
[39]
Figures 2 to 4, the battery cell is applied bar bus according to one embodiment of the present invention, the electrode assembly including a positive electrode plate and negative electrode plate with a membrane posted between a first electrode tab connected to the positive electrode plate and the second a positive electrode tab, the first negative electrode tab and the second negative electrode tab, the cell cover, and the second bus bar and the positive electrode lead and negative electrode lead to which the first bus-bar, connected to the negative electrode plate in parallel through to the positive electrode plate in parallel, the pouch case is connected to the negative electrode plate and it may be configured to include.
[40]
2, the electrode assembly 100 according to one embodiment of the present invention is formed by sandwiching the membrane 130 between the positive electrode plate 110 and the negative electrode plate 120. The One surface of the positive electrode plate 110 and the negative electrode plate 120 has the electrode active material is coated.
[41]
A first electrode tab 111 and the second electrode tab 112 is connected to the positive electrode plate 110, a protrusion is formed is extended across the opposite of the positive electrode plate (110).
[42]
In addition, the first electrode tab and the second electrode tab is formed on both ends of the positive electrode plate axis (A-A ') parallel with any one side of the positive electrode plate.
[43]
The first negative electrode tab 121 and the second negative electrode tab 122 is coupled to the negative electrode plate 120, a protrusion is formed is extended on both sides facing the negative electrode plate 120.
[44]
Further, being formed in both ends of the first negative electrode tab 121 and the second negative electrode tab 122 is the negative electrode plate 120 is parallel to the one side negative electrode plate of any of the axis (B-B '), the negative electrode plate axis (B-B ') is the positive electrode plate axis (a-a' is set different from) is arranged so as not to overlap each other are the positive electrode tab and negative electrode tab.
[45]
The positive electrode plate axis (A-A ') and the negative electrode plate axis (B-B') is preferably in parallel with each other.
[46]
The electrode assembly according to an embodiment of the present invention is merely one of the positive electrode plate 110 and a negative electrode plate describes an electrode assembly 100 configured as a separator (130) interposed between the unit 120, but the stirrer is not limited thereto It is not.
[47]
For example, the structure winding of the long sheet-like positive electrode and the negative electrode in a separator is interposed state jelly-roll type (wound type) electrode assembly, while interposing a plurality of the positive electrode and the negative electrode of a separator taken along as a unit of a predetermined size, a stack-type (stack-type) electrode assembly sequentially stacked in the jelly-roll type and stacking the positive electrode and the negative electrode of a predetermined unit in mixed form in a state in which the position of the unit cells stacked in a state of sandwiching the membrane on the separation film of the It can be applied to a variety of the electrode assembly, such as a stack / folding type electrode assembly of the structure in order to take-up.
[48]
Further, the winding type electrode assembly, a stack type electrode assembly, stack / electrode tabs of the folding type electrode assembly is formed to face the positive and negative plates, the direction positive electrode plate axis and the negative electrode plate axis is formed to each other offset from the cathode tab and the anode tab mutually It can be arranged so that they do not overlap.
[49]
A battery cell according to the invention is further the cell cover 140 is formed such that at least a portion of the electrode assembly 100, the first and second positive electrode tab and the first and second negative electrode tab surrounding the exterior of the exposed It can be included.
[50]
Moreover, the cell cover 140 is formed to surround a circumference of the electrode assembly 100 may perform the insulation function.
[51]
3, the first bus bar 200 corresponds to the outer surface of the positive electrode plate 110, the first electrode tab 111 and the second electrode tab 112, the protrusion (200a at a position corresponding to each a, 200b) is formed.
[52]
In addition, the protrusion (200a, 200b) are respectively connected to the first electrode tab 111 and the second electrode tab (112).
[53]
The connections are preferably welded by a welding process for welding a common electrode tabs, the ultrasonic welding.
[54]
The positive electrode plate 110 is that by having the first bus bar 200, the current flowing to the positive electrode plate 110 is dispersed by the positive electrode plate 110 and the first bus bar 200 is generated by the current the resistance is reduced.
[55]
A second bus bar 300 has a projection (300a, 300b) is formed at a position corresponding to each of the negative electrode plate, it corresponds to the outer surface of 120, the first negative electrode tab 121 and the second negative electrode tab 122 have.
[56]
In addition, the protrusion (300a, 300b) are respectively connected to the first negative electrode tab 121 and the second negative electrode tab 122.
[57]
The connections are preferably welded by a welding process for welding a common electrode tabs, the ultrasonic welding.
[58]
The negative electrode plate 120 is that by having the second bus bar 300, the current flowing through the negative electrode plate 120 is dispersed by the negative electrode plate 120 and the second bus bar 300 is generated by the current the resistance is reduced.
[59]
Further, the first bus bar 200 and the second bus bar 300 is the electrode assembly is formed in a thin plate shape that is arranged to be butted against each other across the (100), each area of ​​the electrode assembly 100 it is preferred not greater than the area.
[60]
The material of the first bus bar 200, the material is preferred to use the same material is aluminum and the material of the positive electrode plate 110, the second bus bar 300 of the same as a material for the negative electrode plate 120 to use a material of copper is preferred.
[61]
The positive electrode lead 410 is connected to any one of the first electrode tab 111 and the second electrode tab 112 is connected with the projection (200a, 200b) of the first bus bar 200 is connected to an external device do.
[62]
In addition, the negative electrode lead 420 is connected to any one of the first negative electrode tab 121 and the second negative electrode tab 122 is connected with the projection (300a, 300b) of the second bus bar 300, the external device It is connected to.
[63]
Here, the positive electrode lead 410 and the negative electrode lead 420 may be formed in opposite directions in the longitudinal direction of the electrode assembly 100.
[64]
5 is a perspective view of the battery cell is applied to the pouch case according to an embodiment of the present invention.
[65]
5, the pouch case 500, at least a portion of the anode lead 410 and anode lead 420 and to expose the first bus bar and the electrode enclosed in the second bus bar and the cell cover It makes it possible to complete the housing the assembly to the battery cell.
[66]
Accordingly, the battery cell is applied a bus bar according to one embodiment of the present invention, can be applied without changing the module or pack structure that was used in the prior art, and by reducing the resistance generated in the positive and negative plates decreased, the output of the battery cell it can be prevented.
[67]
[68]
6 is a flow chart showing a manufacturing method of the battery cell bus bar is applied, according to an embodiment of the invention.
[69]
6, the manufacturing method of the battery cell in accordance with one embodiment of the present invention, a first cathode to the both ends of the one positive electrode tab and the positive electrode plate and the longitudinal direction a second electrode tab provided on both ends in the longitudinal direction tab and the 2 is a separator interposed between the negative electrode tab is formed, a negative electrode plate electrode assembly preparation step of preparing an electrode assembly is wrapped around the cell cover; Bus bar connection comprising: the first connection via the first electrode tab and the second electrode tab and the negative electrode plate connected with a second bus bar on the first negative electrode tab and the second negative electrode tab, the positive electrode plate and the first bus bar; Wherein the connection to the positive electrode lead on one of the first electrode tab and the second electrode tab connected to the first bus bar, and connecting the anode lead to any one of the first negative electrode tab and the second negative electrode tab connected to the bar and the second bus lead connection method comprising; Case assembly step for accommodating the electrode assembly, said positive electrode lead and negative electrode lead connected to the pouch case; can comprise.
[70]
The electrode assembly preparation step (S100), the electrode assembly is composed of a separator interposed between the positive electrode plate, negative electrode plate, the positive electrode plate and the negative electrode plate.
[71]
In addition, the first electrode tab and the second electrode tab that any one side and formed on both end portions parallel to the positive electrode plate axis, and the first negative electrode tab and the second negative electrode tab of the positive electrode plate is any one side of the negative electrode plate, and axis parallel to the negative electrode plate are formed in both ends, wherein the negative electrode plate axis is set different from the positive electrode plate and the shaft is ready to be disposed so as not to overlap each other are the positive electrode tab and negative electrode tab.
[72]
The positive electrode plate and negative electrode plate shaft axis is preferably set to be parallel to each other.
[73]
Also, further comprising a cell cover forming step to the first to surround the first electrode tab and the second electrode tab and the cell cover so that the first negative electrode tab and the second portion and at least a portion of the negative electrode tab exposed to the outside in the electrode assembly do.
[74]
In busbar connection step (S200), interposed between the electrode assembly is surrounded by the cell cover and connect the first bus bar and second bus bar.
[75]
Also, the first bus bar of the first connection to the positive electrode tab and the second electrode tab, and the second bus bar is connected to the first negative electrode tab and the second negative electrode tab.
[76]
The first bus bar and second bus bar is to be a thin plate-like metal material.
[77]
The first bus bar and a second area of ​​the bus bar is preferably not larger than the area of ​​the electrode assembly is surrounded by the cell cover.
[78]
Lead connection step (S300), wherein the connecting the positive electrode lead on one of the first positive electrode tap or a second electrode tab connected to the first bus bar, and is connected as the second bus, the first negative electrode tab or the second negative electrode tab the connection of the negative electrode lead as in any one.
[79]
However, the position where the positive electrode lead and negative electrode lead are formed so as to be located in the directions opposite to each other in the longitudinal direction.
[80]
Case assembly step (S400), and at least a portion of the positive electrode lead and negative electrode lead completed via the lead connection stage and is exposed, wherein the first bus bar and second bus bar, and to receive the electrode assembly is wrapped around the cell cover and it can be completed battery cells.
[81]
[82]
Reference Numerals
[83]
1, 100 an electrode assembly
[84]
10, 110 positive electrode plate
[85]
The positive electrode tab 11
[86]
20, the negative electrode plate 120
[87]
The negative electrode tab 21
[88]
30, 130 membrane
[89]
A first electrode tab 111
[90]
The second electrode tab 112
[91]
The first negative electrode tab 121
[92]
The second negative electrode tab 122
[93]
140 cell cover
[94]
200 the first bus bar
[95]
200a, 200b, a first bus bar protrusion
[96]
300 second bus bar
[97]
300a, 300b the second bus bar protrusion
[98]
Positive electrode lead 410
[99]
The negative lead 420
[100]
Pouch case 500

Claims
[Claim 1]
The membrane electrode assembly includes a positive electrode plate and negative electrode plate between posted; Coupled to the positive electrode plate of claim 1, the positive electrode tab and the second electrode tab that is formed by protruding height across the opposite of the positive electrode plate; Coupled to the negative electrode plate of claim 1, the negative electrode tab and the second negative electrode tab that is formed by the protruding height of the both ends facing the negative electrode plate; First and second positive electrode tab and the first and the cover shell surrounding the electrode assembly and at least a portion of the second negative electrode tab are exposed to the outside; Corresponds to the outer surface of the positive electrode plate, are formed protruding at a position corresponding to each of the first electrode tab and the second electrode tab, the projecting portion includes a first bus that is respectively connected to the first electrode tab and the second electrode tab bar; Corresponds to the outer surface of the negative electrode plate, wherein the first negative electrode tab and the second negative electrode tab is formed in the protrusion in a position corresponding to each of the projections of the second bus are each connected to the first negative electrode tab and the second negative electrode tab bar; A first electrode tab connected to the protruding portion of the bus bar 1 or the second anode lead coupled to one of a positive electrode tab; A first negative electrode tab connected to the protruding portion of the second bus bar or the second negative electrode of the negative electrode tab connected to one lead; And a pouch case for accommodating the electrode assembly and the first and second bus bars at least a portion of the positive electrode lead and the negative electrode lead is to be exposed to the outside; Battery Cell applying a bus bar, comprising a step of including
[Claim 2]
The method of claim 1, wherein the battery cell is applied the first electrode tab and the second electrode tab is provided with a bus bar, characterized in that formed on the both ends in parallel with any one side of the positive electrode plate of the positive electrode plate axis
[Claim 3]
The method of claim 2, wherein the first negative electrode tab and the second negative electrode tab, being formed at any one side and both end portions parallel to the negative electrode plate the axis of the negative electrode plate, the negative electrode plate axis is the positive electrode plate shaft and otherwise is set to the positive electrode tab and the battery cell is applied to the bus bar is arranged so that the negative electrode tab overlap each other
[Claim 4]
The method of claim 1, wherein the battery cell is applied the first bus bar and second bus bar, the bus, characterized in that a thin plate is arranged to be butted against each other across the electrode assembly bar
[Claim 5]
The method of claim 4, wherein the battery cell material of said first bus bar is bus bar is applied, characterized in that the aluminum
[Claim 6]
The method of claim 4, wherein the battery cell is applied the first bus, characterized in that the copper material of the second bus bar to bar
[Claim 7]
The method of claim 1, wherein the first bus bar and the area of ​​the second bus bar includes a battery cell, applying a bus bar, characterized in that is not greater than the area of ​​the electrode assembly
[Claim 8]
According to claim 1, wherein said positive electrode lead and the negative electrode lead, the battery cell is applied characterized in that the bus bars are formed in opposite directions to each other in the longitudinal direction of the electrode assembly
[Claim 9]
Bus according to the production method of the battery cell is applied a bar, a separator between the first negative electrode tab and the second negative electrode tab is formed, a negative electrode plate at both ends in the first positive electrode tab and the positive electrode plate and a longitudinal second electrode tab is formed at both ends in the longitudinal direction the electrode assembly preparation step of preparing an electrode assembly is interposed wrapped around the cell cover; Bus bar connection comprising: the first connection via the first electrode tab and the second electrode tab and the negative electrode plate connected with a second bus bar on the first negative electrode tab and the second negative electrode tab, the positive electrode plate and the first bus bar; Wherein the connection to the positive electrode lead on one of the first electrode tab and the second electrode tab connected to the first bus bar, and connecting the anode lead to any one of the first negative electrode tab and the second negative electrode tab connected to the bar and the second bus lead connection method comprising; Case assembly step for accommodating the electrode assembly, said positive electrode lead and negative electrode lead connected to the pouch case; Battery cell manufacturing method applying a bus bar, comprising a step of including
[Claim 10]
The method of claim 9, wherein the electrode assembly preparation step, the first electrode tab and the second electrode tab is formed on both ends positive electrode plate in parallel with any one side of the positive electrode plate axis, the first negative electrode tab and the second cathode tab battery apply the bus bar, characterized in that being formed at any one side and both end portions parallel to the negative electrode plate the axis of the cathode plate, is set different from the negative electrode plate axis is the positive electrode plate shaft are arranged so as not to overlap each other are the positive electrode tab and negative electrode tab cell preparation
[Claim 11]
The method of claim 9, wherein the bus bar connecting step, the first bus bar and second bus bar is bus bar method for manufacturing the battery cell is applied, characterized in that a thin metal plate that is arranged at between the electrode assembly
[Claim 12]
The method of claim 11, wherein the first bus bar and second bus bar is the area of ​​the battery cell manufacturing method is applied, characterized in that the bus bar is not greater than the area of ​​the electrode assembly