Title of Invention: Pressurization jig device for attaching electrode leads to busbars and battery module manufacturing system including the same
Technical field
[One]
The present invention relates to a pressurization jig device for closely contacting an electrode lead to a bus bar, and a battery module manufacturing system including the same, and more specifically, an electrode lead assembly of each of a plurality of groups of battery cell stacks is in close contact with the bus bar at the same time. It relates to a pressurization jig device used to make and a battery module manufacturing system including the same.
[2]
This application is an application for claiming priority for Korean Patent Application No. 10-2018-0167940 filed on December 21, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
Background
[3]
In the case of a conventional battery module, a bus bar is applied for electrical connection between stacked battery cells, but welding is performed after bending a plurality of electrode leads drawn from each of the plurality of battery cells and placing them on the bus bar.
[4]
In the case of manufacturing a battery module in this way, using a jig to press the electrode lead in the direction toward the bus bar with the bent electrode lead placed on the bus bar, so that the electrode lead is in close contact with the bus bar, Was discharged to perform welding.
[5]
1 and 2, there is shown a conventional battery module in which a plurality of pouch-type battery cells are electrically connected by a bus bar.
[6]
In this conventional battery module, as shown in FIG. 1, after inserting each electrode lead 2 drawn out from a plurality of pouch-type battery cells 1 into the lead slit 4 of the bus bar 3, As shown in FIG. 2, it is manufactured by bending the inserted electrode lead 2 and in close contact with the bus bar 3 and welding.
[7]
However, in the conventional battery module, in addition to the process of inserting the electrode lead 2 into the lead slit 4 of the bus bar 3 and the process of welding the electrode lead 2 to the bus bar 3, the electrode lead The process of bending (2) is additionally required, which complicates the manufacturing process.
[8]
In addition, in the case of a pouch-type cell applied to a battery module, as the thickness of the cell decreases, the length of the electrode lead is also made shorter. Is lowered, thereby increasing the concern of occurrence of product defects.
[9]
Accordingly, there is a need to develop a battery module structure in which the bending process of the electrode lead can be omitted, and accordingly, the development of a new welding pressure jig suitable for the bonding structure between the electrode lead and the bus bar is also required.
Detailed description of the invention
Technical challenge
[10]
The present invention is invented in consideration of the above-described problems, and in the manufacture of a battery module having a form in which the electrode leads are coupled by welding with the bus bar in a state in which the electrode leads are not bent for bonding to the bus bar, An object of the present invention is to provide a welding pressure jig device configured to allow an electrode lead assembly to be in close contact with a bus bar in order to be welded in a close contact state.
[11]
In addition, the present invention prevents the melt pool generated in the welding process between the electrode lead assembly and the busbar from sticking to the pressing jig device by changing the contact position of the pressing tip and the electrode lead assembly of the pressing jig device and the shape of the pressing tip. It has another purpose.
[12]
However, the technical problem to be solved by the present invention is not limited to the above-described problem, and other problems that are not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.
Means of solving the task
[13]
A battery module manufacturing system according to an embodiment of the present invention for solving the above-described problems includes a cell stack formed by stacking a plurality of battery cells, a module case accommodating the cell stack, and an opening at one side of the module case. Battery module including a bus bar frame covering the; A fixed frame coupled to one side of the battery module so that the bus bar frame is exposed to the outside; And at least one pressing jig device that is coupled to the fixed frame and presses the electrode lead so that welding can be performed with the electrode lead of the battery cell in close contact with both sides of the bus bar provided in the bus bar frame. ; Includes.
[14]
The pressing jig device includes a first frame and a second frame, and each of the first frame and the second frame is coupled to enable a relative rotational movement with respect to a central axis fastened to one end of the first frame and the second frame. I can.
[15]
The first frame is provided at the other end of the longitudinal direction, and includes a first pressing tip for pressing the lead assembly of the first unit cell stack constituting the cell stack to be in close contact with one side of the bus bar. The second frame is provided at the other end of the longitudinal direction to face the first pressing tip, and the lead assembly of the second unit cell stack constituting the cell stack is in close contact with the other side of the bus bar. It may include a second pressure tip to pressurize to be.
[16]
The first pressing tip and the second pressing tip may pressurize the lead assembly, but pressurize at a position corresponding to a lower portion of the center of one side and the other side of the bus bar in the height direction.
[17]
The first pressing tip and the second pressing tip may have a chamfered upper portion of a surface facing the lead assembly.
[18]
The pressing jig device may include an elastic member connected between the first frame and the second frame to apply a force in a direction in which the first frame and the second frame are close to each other.
[19]
The pressing jig device may include a lead protrusion prevention unit that is fixed between the first frame and the second frame and presses the electrode lead downward so that the electrode lead does not protrude upward from the upper surface of the bus bar. have.
[20]
The lead protrusion prevention unit may include a pair of horizontal bars spaced apart from each other and extending side by side; And a partition wall connecting a central portion of each of the pair of horizontal bars. Including, the horizontal bar, it is possible to press the electrode lead downward.
[21]
On the other hand, the pressing jig device according to an embodiment of the present invention for solving the above-described problem is installed on one side of a battery module including a cell stack formed by stacking a plurality of battery cells, and provided in the battery module. A device for pressing the electrode leads so that welding can be performed in a state in which the electrode leads are in close contact on both sides of the bus bar, comprising: a first frame; And a second frame facing the first frame and coupled to enable a relative rotational motion with the first frame, wherein the first frame is provided at one end portion in the length direction to constitute the cell stack. And a first pressing tip for pressing the lead assembly of the first unit cell stack to be in close contact with one side of the bus bar, and the second frame is provided at one end of the length direction to face the first pressing tip. As seen, it includes a second pressing tip for pressing the lead assembly of the second unit cell stack constituting the cell stack to be in close contact with the other side of the bus bar.
Effects of the Invention
[22]
According to an aspect of the present invention, the electrode lead may be bonded to the bus bar by welding without being bent. Accordingly, the electrode lead is not exposed to the top of the bus bar, so there is a risk of damage to the welding portion between the electrode lead and the bus bar. Is reduced.
[23]
In addition, according to another aspect of the present invention, it is possible to prevent contamination of the pressing jig device due to adhesion of the molten pool of the electrode lead assembly to the pressing tip of the pressing jig device during the welding process for bonding between the electrode lead assembly and the bus bar.
Brief description of the drawing
[24]
1 and 2 are diagrams illustrating a process of combining an electrode lead and a bus bar in manufacturing a conventional battery module.
[25]
3 is a perspective view showing a battery module manufacturing system according to an embodiment of the present invention.
[26]
4 is a view showing a state in which the pressing jig device according to an embodiment of the present invention presses the lead assembly to be in close contact with the bus bar.
[27]
5 is a perspective view showing a pressing jig device according to an embodiment of the present invention.
[28]
6 is a plan view showing one surface of a pressing jig device according to an embodiment of the present invention.
[29]
7 is a view showing in detail a positional relationship between a pressure tip and a lead assembly, and a bus bar and a shape of a pressure tip provided in a pressure jig device according to an embodiment of the present invention.
[30]
8 is a view showing a state in which the lead assembly is pressed by the lead protrusion prevention unit so that it does not protrude further upward than the upper surface of the bus bar in the pressing jig device according to an embodiment of the present invention.
Mode for carrying out the invention
[31]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[32]
First, referring to FIG. 3, a battery module manufacturing system according to an embodiment of the present invention may be implemented in a form including a battery module 100, a pressing jig device 200, and a fixing frame 300.
[33]
3 and 4, the battery module 100 covers a cell stack 110, a module case 120 accommodating the cell stack 110, and an opening at one side of the module case 120 It includes a bus bar frame 130.
[34]
The cell stack 110 includes a first unit cell stack 110A and a second unit cell stack 110B positioned adjacent thereto. Although only two unit cell stacks are shown in the drawings of the present invention, this does not limit the number of unit cell stacks, and if the number of unit cell stacks is two or more, the number is not limited. Further, in the drawings of the present invention, only a case in which one unit cell stack consists of three battery cells 111 is illustrated, but this does not limit the number of battery cells 111 included in one unit cell stack. In one unit cell stack, two or four or more battery cells may be included.
[35]
Each of the unit cell stacks 110A and 110B is formed by stacking a plurality of battery cells 111 facing each other, and each of the battery cells 111 stacked to form one unit cell stack is an electrode lead ( 111a).
[36]
The electrode leads 111a provided in each of the battery cells 111 constituting one unit cell stack 110A and 110B form a group and are grouped together to form a lead assembly T.
[37]
This lead assembly T is formed by gathering electrode leads 111a drawn from the same unit cell stacked body through a lead slit (not shown) or a lead through hole (not shown) formed in the bus bar frame 130. It is exposed to the top surface of 130 (a surface parallel to the XZ plane in FIG. 3). The exposed lead assembly T is in close contact with the bus bar 131 fixedly installed on the upper surface of the bus bar frame 130.
[38]
More specifically, the lead assembly T provided in the first unit cell stack 110A is in close contact with one side of the bus bar 131 and is provided in the second unit cell stack 110B. The assembly (T) is in close contact on the other side of the bus bar (131). This close contact of the lead assembly T is achieved by pressing the pressing jig device 200, and the lead assembly T is welded in close contact with the bus bar 131 to be joined to the bus bar 131.
[39]
As such, the lead assemblies T of each of the unit cell stacks 110A and 110B adjacent to each other may be electrically connected through one bus bar 131.
[40]
3 and 4, the pressurization jig device 200 is disposed on one side of the battery module 100 so that the lead assembly T of each of the unit cell stacks 110A and 110B adjacent to each other is a bus It is a device that presses the lead assembly T so as to be in close contact with one side and the other side of the bar 131, respectively. 4 to 6, the pressing jig device 200 includes a first frame 210, a second frame 220, a rotation shaft 230, an elastic member 240, and a lead protrusion prevention unit 250. ) Can be implemented.
[41]
The first frame 210 and the second frame 220 have a relative rotational motion between each other by a rotational shaft 230 that is fastened through one end of each of the longitudinal directions (in a direction parallel to the Y-axis in FIG. 4). Combined to be possible. The first frame 210 and the second frame 220 rotate around one end portion in the length direction, so that the other end portion becomes close to each other or away from each other. The rotation shaft 230 may be provided at each end of each side in the width direction (parallel to the Y axis in FIG. 4) for stable operation of the pressing jig device 200.
[42]
The first frame 210 includes a first pressing tip 211 and a first sub-frame 212. The first pressing tip 211 is provided at the other end of the first frame 210 in the longitudinal direction, that is, on a side opposite to the coupling portion between the first frame 210 and the second frame 220.
[43]
The first pressing tip 211 is moved in a direction toward the second frame 220 due to a relative rotational motion between the first frame 210 and the second frame 220 to be attached to the first unit cell stack 110A. The provided lead assembly T is pressed so as to be in close contact with one side surface of the bus bar 131.
[44]
The first sub-frame 212 is provided between one end of the first frame 210 in the longitudinal direction and the other end, and is substantially perpendicular to the longitudinal direction of the first frame 210 (X in FIG. 4 ). It has a shape extending in a direction parallel to the axis) In addition, the first sub-frame 212 has a shape in which an end portion thereof is bent upward or downward (in a direction parallel to the Y axis in FIG. 4 ). The end of the first sub-frame 212 bent in this way functions as a support surface supporting the elastic member 240. Each of the first sub-frames 212 may be formed at both ends of the pressing jig device 200 in the width direction (parallel to the Y-axis in FIG. 4 ).
[45]
Similar to the first frame 210, the second frame 220 includes a second pressing tip 221 and a second sub frame 222. The second pressing tip 221 is provided at the other end of the second frame 220 in the longitudinal direction, that is, on a side opposite to the coupling portion between the first frame 210 and the second frame 220.
[46]
The second pressing tip 221 is moved in a direction toward the first frame 220 by a relative rotational motion between the first frame 210 and the second frame 220 to be attached to the second unit cell stack 110B. The provided lead assembly T is pressed so as to be in close contact with the other side surface of the bus bar 131.
[47]
The second sub-frame 222 is provided between one end of the second frame 220 in the length direction and the other end, and is substantially perpendicular to the length direction of the second frame 220 (X in FIG. 4 ). It has a shape that extends in a direction parallel to the axis). In addition, the second sub-frame 222 has a shape in which an end thereof is bent downward or upward (a direction parallel to the Y-axis in FIG. 4), but is bent in a direction opposite to the end of the first sub-frame 212 Has the form
[48]
The end of the second sub-frame 222 bent in this way functions as a support surface for supporting the elastic member 240. That is, the support surface formed by the end of the first sub-frame 212 and the support surface formed by the end of the second sub-frame 222 are arranged in parallel with each other, and the elastic member 240 therebetween Is interposed. Each of the second sub-frames 222 may be formed at both ends of the pressing jig device 200 in the width direction (parallel to the Y-axis in FIG. 4 ).
[49]
The elastic member 240 may be applied with, for example, a spring. One side of the elastic member 240 in the longitudinal direction (X-axis direction in FIG. 4) is coupled on a support surface formed by an end of the second sub-frame 222, and the other side is an end of the first sub-frame 212 It is bonded on the support surface formed by.
[50]
In addition, the length of the elastic member 240 in a state in which no external force is applied is shorter than the distance between the end of the first sub-frame 212 and the end of the second sub-frame 222. Due to the length of the elastic member 240, the elastic member 240 is coupled between the pair of sub-frames 212 and 222 in an extended state, whereby the elastic restoring force of the elastic member 240 is first The frame 210 and the second frame 220 act in a direction closer to each other.
[51]
Accordingly, the user of the pressing jig device 200 may rotate in a direction in which the first pressing tip 211 and the second pressing tip 221 are separated from each other, and the first frame 210 and the second frame 220 are rotated. After applying a force in the open direction so that the bus bar 231 and the lead assembly T are positioned between the first pressing tip 211 and the second pressing tip 221, the lead assembly (T) is removed by removing the applied force. ) May be in close contact with the bus bar 231. That is, the magnitude of the pressing force applied by the first pressing tip 211 and the second pressing tip 221 to the lead assembly T is proportional to the elastic restoring force of the elastic member 240.
[52]
Referring to FIG. 7, the first pressing tip 211 and the second pressing tip 221 are provided with a pair of lead assemblies T provided in adjacent unit cell stacks 110A and 110B. The pressure may be pressed so as to be in close contact with both sides of the bus bar 131, but the pressure may be performed at a position corresponding to a lower portion of the center of one side and the other side in the height direction of the bus bar 131. This is to prevent the molten pool of the electrode lead 111a formed when the lead assembly T is welded in close contact with the bus bar 131 from adhering to the pressure tips 211 and 221.
[53]
In addition, the first pressing tip 211 and the second pressing tip 221 may have a chamfered upper portion of a surface facing the lead assembly T. This is also to prevent the molten pool from sticking to the pressing tips 211 and 221.
[54]
When the molten pool is adhered to the pressure tips 211 and 221, when the pressure tips 211 and 221 are removed from the lead assembly T, the lead assembly T receives force and the lead assembly T and the bus bar ( 131) may be damaged, and after performing a certain number of welding, an additional process of removing the glued molten pool must be performed. Therefore, the pressing jig device 200 according to the present invention is to solve this problem by improving the pressing position and the shape of the pressing tips 211 and 221 using the pressing tips 211 and 221.
[55]
4 to 7, the lead protrusion prevention unit 250 is fixed between the first frame 210 and the second frame 220 by a coupling rod C, so that the lead assembly T is a bus. The lead assembly T is pressed downward so that it does not protrude above the upper surface of the bar 131.
[56]
An end portion of the lead protrusion prevention unit 250 is provided with a pair of horizontal bars (B) that are separated from each other and extend in parallel, and a partition wall (W) connecting the central portions of the pair of horizontal bars (B). The horizontal bar (B) and the partition wall (W) have a shape extending in a direction substantially perpendicular to each other, whereby the end of the lead protrusion prevention unit 250 has an H-beam shape.
[57]
The horizontal bar B directly presses the lead assembly T so that the lead assembly T does not protrude to the upper surface of the bus bar 131 by contacting the lead assembly T. The distance D1 between the outer edge portions of each of the pair of horizontal bars B is equal to or shorter than the width D2 of the lead assembly T. This is to allow the horizontal bar B to contact the lead assembly T when the lead protrusion prevention unit 250 descends toward the bus bar 131.
[58]
One end of each of the pair of horizontal bars B in the length direction presses both ends of the lead assembly T in the width direction.
[59]
In this way, in a state in which the horizontal bar (B) presses the lead assembly (T) from the top so that the lead assembly (T) does not protrude further above the upper surface of the bus bar (131), The lead assembly T and the bus bar 131 may be welded by irradiating a laser beam through the openings formed on both sides or approaching the welding rod.
[60]
That is, the opening portions formed on both sides of the partition wall W are in communication with the opening portions formed on the upper portion of the pressing jig device 200, thereby removing the lead assembly T from the upper portion of the pressing jig device 200. A space in which a welding rod or a laser beam can be accessed is provided along the facing direction (a direction parallel to the Y axis in FIG. 4).
[61]
Meanwhile, referring again to FIG. 3, the fixed frame 300 is coupled to one side of the battery module 100 so that the bus bar frame 130 is exposed to the outside. This fixed frame 300 functions as a support to which the pressing jig device 200 is fixed.
[62]
Although the present invention in the above has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims.
Claims
[Claim 1]
A battery module including a cell stack formed by stacking a plurality of battery cells, a module case accommodating the cell stack, and a bus bar frame covering an opening of one side of the module case; A fixed frame coupled to one side of the battery module so that the bus bar frame is exposed to the outside; And at least one pressing jig device that is coupled to the fixed frame and presses the electrode lead so that welding can be performed with the electrode lead of the battery cell in close contact with both sides of the bus bar provided in the bus bar frame. ; Battery module manufacturing system comprising a.
[Claim 2]
The method of claim 1, wherein the pressing jig device includes a first frame and a second frame, and each of the first frame and the second frame rotates relative to each other based on a rotation axis fastened to one end of the first frame and the second frame. Battery module manufacturing system, characterized in that coupled to enable movement.
[Claim 3]
The method of claim 2, wherein the first frame is provided at an end of the other side in the longitudinal direction, and pressurizes the lead assembly of the first unit cell stack constituting the cell stack to be in close contact with one side of the bus bar. A first pressure tip is included, and the second frame is provided at the other end in the longitudinal direction to face the first pressure tip, and the lead assembly of the second unit cell stack constituting the cell stack is the bus Battery module manufacturing system, characterized in that it comprises a second pressure tip for pressing so as to be in close contact with the other side of the bar.
[Claim 4]
The method of claim 3, wherein the first pressing tip and the second pressing tip respectively press the corresponding lead assembly, but pressurize at a position corresponding to a lower side of the bus bar in a height direction lower than the center of one side and the other side of the bus bar. Battery module manufacturing system, characterized in that to perform.
[Claim 5]
The battery module manufacturing system of claim 4, wherein the first pressing tip and the second pressing tip have a chamfered upper portion of a surface facing the lead assembly.
[Claim 6]
The method of claim 2, wherein the pressing jig device comprises an elastic member connected between the first frame and the second frame to apply a force in a direction in which the first frame and the second frame are close to each other Battery module manufacturing system.
[Claim 7]
The lead protrusion of claim 2, wherein the pressing jig device is fixed between the first frame and the second frame to press the electrode lead downward so that the electrode lead does not protrude upward from the upper surface of the bus bar. Battery module manufacturing system comprising a prevention unit.
[Claim 8]
According to claim 7, The lead protrusion prevention unit, A pair of horizontal bars that are spaced apart from each other and extend in parallel; And a partition wall connecting a central portion of each of the pair of horizontal bars. Including, wherein the horizontal bar, the battery module manufacturing system, characterized in that pressing the electrode lead downward.
[Claim 9]
The electrode is installed on one side of a battery module including a cell stack formed by stacking a plurality of battery cells, and welding is performed in a state in which electrode leads are in close contact on both sides of a bus bar provided in the battery module. A welding pressure jig device for pressing a lead, comprising: a first frame; And a second frame facing the first frame and coupled to the first frame to enable a relative rotational motion. Including, wherein the first frame is provided at one end in the longitudinal direction, a first pressing tip for pressing the lead assembly of the first unit cell stack constituting the cell stack to be in close contact with one side of the bus bar Including, the second frame is provided at one end in the longitudinal direction facing the first pressing tip, the lead assembly of the second unit cell stack constituting the cell stack is the other side of the bus bar A pressing jig device comprising a second pressing tip for pressing so as to be in close contact with the device.
[Claim 10]
The method of claim 9, wherein the first pressing tip and the second pressing tip pressurize the lead assembly, but perform pressing at a position corresponding to a lower side of the bus bar in a height direction lower than the center of one side and the other side Pressurization jig device characterized in that.
[Claim 11]
The pressing jig device according to claim 10, wherein the first pressing tip and the second pressing tip have a chamfered upper portion of a surface facing the lead assembly.
[Claim 12]
The method of claim 9, wherein the pressing jig device comprises an elastic member connected between the first frame and the second frame to apply a force in a direction in which the first frame and the second frame are close to each other. Pressing jig device.
[Claim 13]
The lead protrusion of claim 9, wherein the pressing jig device is fixed between the first frame and the second frame to press the electrode lead downward so that the electrode lead does not protrude upward from the upper surface of the bus bar. A pressurizing jig device comprising a prevention unit.
[Claim 14]
14. The display device of claim 13, wherein the lead protrusion prevention unit comprises: a pair of horizontal bars spaced apart from each other and extending side by side; And a partition wall connecting a central portion of each of the pair of horizontal bars. It includes, wherein the horizontal bar, a pressing jig device, characterized in that pressing the electrode lead downward.