Art
[1]The present invention relates to a laser welding apparatus including this jig and a laser welding.
[2]This application claims priority to an application for the Korea Patent Application No. 10-2017-0116064, filed on September 11 as 2017, all the contents disclosed in the specification and drawings of that application is hereby incorporated by reference into this application.
BACKGROUND
[3]
As the battery cells, the current commercially available secondary batteries are nickel-cadmium batteries, nickel hydrogen batteries, nickel-zinc battery, there is a lithium secondary battery or the like, of which lithium secondary batteries are charged and the memory effect, compared to a secondary battery of nickel series are hardly occur free discharge, self-discharge rate was very low, the spotlight as a high energy density advantages.
[4]
The lithium secondary battery mainly uses a lithium-based oxide and carbon materials as an anode active material and the negative active material. The lithium secondary battery is provided with such a positive electrode active material and the negative electrode active material are respectively coated with the positive electrode plate and the negative electrode plate are disposed with a separator between the electrode assembly and the casing for accommodating the electrode assembly and an electrolyte sealed together, i.e. the battery pouch exterior.
[5]
Generally, lithium secondary batteries according to the shape of the casing, the electrode assembly may be classified as a pouch-shaped secondary cell with a can type secondary battery with an electrode assembly that is embedded in a metal can be incorporated in a pouch of an aluminum laminate sheet.
[6]
In recent years, as well as small equipment such as portable electronic devices, has become a widely used secondary batteries in the middle- or large-sized devices, such as automobiles and electric power storage device. When used in such a middle- or large-sized devices, a large number of secondary batteries in order to increase the capacity and output are electrically connected. In particular, the middle- or large-sized apparatus is used a lot of the pouch type secondary battery due to the advantage that the laminate easily.
[7]
To be secondary batteries are electrically connected within the battery module, and the electrode leads are interconnected, the connection portions can be welded in order to maintain such connections. Furthermore, the battery module can have a parallel and / or series electrical connection between the secondary battery, and may be fixed in contact by way of welding such as a bus bar for electrical connection between one end of each secondary battery of the electrode lead for this purpose .
[8]
Electrical connection between the secondary battery is often configured in a manner to bond the bus bar electrode lead. At this time, in order to electrically connect the secondary battery in parallel and connected with each other bonded to the electrode leads of the same polarity in order to electrically connect in series to each other it is joined to the electrode leads of the other polarity.
[9]
If in this bonding process, the leads to the electrodes should not be connected to each other into contact with each other, but the battery pack is damaged by an internal short circuit occurs, of course, there is a fire or explosion may occur in severe cases. On the other hand, if the electrode lead is to be connected to each other separated from each other, so preventing not properly supplied with power from the battery module, the power supply insensitive phenomenon may occur or degrade the capacity or the output of the battery module. Thus, if the power insensitive, such as occurs, and the operation of the battery module mounted devices, such as automobiles it can be stopped, which can lead to a major accident.
[10]
Thus, the contact between the electrode lead, and the original is required to be stably maintained as intended, the contact or separation between the unintended electrode lead should not get up. Furthermore, in the case of the battery module, a vibration, because they can be frequently exposed to impact, vibration or the development of a battery module in a connection of the electrode lead it can be stably maintained even shock is constantly required to be used in automobiles.
[11]
Further, in the battery module, it is, with the stability of the connection between the electrode leads to be secured weldability. For example, even if the connection between the electrode lead stable if the welding is to be performed very difficult, and may decrease the productivity of the battery module, there is a possibility that defects occur can be increased.
[12]
In particular, in the battery module, there lead bus bar may be provided to electrically connect the secondary battery, such a lead bus bar has to be in contact with the electrode leads to be welded to the electrode lead. Therefore, in the manufacturing process of the battery module, such electrode lead and the lead bus to the connection between it can be made well-bar, to be a structure to facilitate the welding operations provided for the bonding portion between the electrode lead and the lead-bus bar have. Furthermore, there is a plurality of electrode lead and the lead bus bar connection could be a bonding process, such as laser welding performed to be stably maintained, and in this case, it is preferable that the welding is provided with an excellent module structure.
[13]
However, the battery module of the prior art, to the electrode leads of the secondary battery to become stable bond as lead bus, one end bent one after the electrode lead so as to contact a relatively large area of ​​one side of the electrode lead bar lead bus, the electrode lead it is bonded to the front surface of the curved one side and the lead-bus bar was inevitable.
[14]
In such a bonding process, by bending the lead electrodes must be carried out additionally the operation of contacting the lead bus bar, the need for additional bending jig was configured for such operation. As a result, the weld bonding process between the electrode lead and the lead-bus bar becomes complicated, there is a problem that the working time and cost increase.
[15]
Further, in performing tasks such as laser welding for the bonding between the lead bus bar electrode lead, between the electrode leads of the stacked secondary batteries are arbitrarily a very narrow space, it is another tangent between the electrode lead during the welding operation was easy, It was a very difficult task to perform welding so that the secondary battery is not damaged.
[16]
Moreover, the bent portion of the aforementioned electrode lead is caused to be the need for more working space in a welding process. For example, to perform a welding process for bonding the electrode welding spot between the bent portion and the lead-bus bar of the lid, the welding for adhesion as lead bus margin allowance, an electrode lead for these welding spots in a bent form is a need for space, and so arranged in the fixture, welding efficiency, the welding operation becomes further narrow space is conducive to a decrease.
[17]
In particular, as the thickness of the secondary battery gradually decreases in accordance with the recent trend weight, space for the bonding process of the electrode lead and the lead-bus bar has become more narrow. That is, when the one end of the bending direction of the electrode lead match the stacking direction of the secondary battery, thinner in the stacked direction the secondary battery, it becomes easy that cause interference to damage of the adjacent secondary batteries is very difficult welding work process time the problem that required an increase has occurred in.
Detailed Description of the Invention
SUMMARY
[18]
Accordingly, the present invention provides a laser welding apparatus including as designed to solve the above problems, the electrode leads and the lead bus in an improved welding efficiency with the reliability of the electrical connection between the bar can be secured laser welding jig, and this It intended to.
[19]
It may be understood by the following description of Other objects and advantages of the present invention will be appreciated more clearly by the embodiment of the present invention. Also, the objects and advantages of the invention will be readily appreciated that this can be realized by the means as claimed and combinations thereof.
Problem solving means
[20]
A laser for welding to the present invention for achieving the above object, one embodiment the at least two battery cells, at least one of the read bus of the bus bar unit to cover the one side surface of the battery cell and the electrode lead-bar of according to according when a welding jig, the welding jig main body that covers the bus bar unit; The jig is formed at the main body, in order for the welding with said electrode lead wherein the at least one lead-bus bar to the plurality of welding slit for exposing out of the jig body; Is provided in between the plurality of welding the slit, at least one of the pressure bolt is inserted at least one of the bolt insertion holes are arranged a plurality of bolt insertion portions that are to be; And is provided at a rear portion inserted into each of the bolt, spaced apart from each other according to the pressure bolt in the lead contact block of the pair of close contact of the electrode lead bar, the read bus; providing a laser welding jig comprising the do.
[21]
Reed contact block of the pair are, may be attached to the jig body to be slidable in the longitudinal direction of the jig main body.
[22]
Reed contact block of the pair are, can be gradually separated from each other upon insertion of the at least one of the pressing bolt.
[23]
The at least one pressure bolt, the bolt head has a diameter corresponding to the inner diameter of the bolt insertion hole; Bolt leg has a smaller diameter than the bolt head; And a bolt connecting the leg and the bolt head, the bolt being a tapered diameter progressively reduced toward the leg bolt from the bolt head; may include.
[24]
In the lead contact block of the pair, facing each other are arranged to form a space of a size that can pass through said bolt leg, the at least one at least, which are mutually spaced along the insertion of the pressing bolt one of the insertion guide groove; the It may be prepared.
[25]
In the bus bar unit, disposed in the bus bar unit rearward at least one of the bolt insertion holes when the cover of the jig main body, wherein the at least at least one ball tinghom one pressing bolt is inserted; there can be provided.
[26]
The weld may be a laser welding is performed within the plurality of welding slit.
[27]
The present invention provides a laser welding apparatus, laser welding according to the foregoing embodiments jig; The at least one pressure bolt; Provides a laser welding apparatus comprising: a; and welding laser for irradiating a laser for the welding.
Effects of the Invention
[28]
In accordance with various embodiments of the present invention it can be not necessary to form a bent structure on the electrode lead of the battery cell to achieve a reliable bonding the electrical connections between the electrode lead and the lead bus bar.
[29]
Therefore, the production cost as they become the bonding process for manufacturing a battery module according to the present invention, by bending the electrode leads can be omitted, the work is brought into contact as a lead bus, unnecessary bending operation and the bending jig structure of the electrode lead reduce, can shorten the working time.
[30]
Further, according to this aspect of the invention, is to require more work area for the welding process due to the bent portion of the electrode lead to be bonded as a lead bus as in the prior art, it is possible to prevent poor production efficiency issues .
Brief Description of the Drawings
[31]
Intended to illustrate the following figures attached to the specification are exemplary of the invention, the components which serve to further understand the spirit of the invention and together with the description of which will be described later invention, the details of this invention is described in such figures be construed as limited only is not.
[32]
1 is a view for explaining the welding of a battery module according to an embodiment of the present invention.
[33]
Figure 2 is a front perspective view of the laser welding jig of the laser welding apparatus of Figure 1;
[34]
Figure 3 is a rear perspective view of the laser welding jig of Figure 2;
[35]
Figure 4 is a rear view of the laser welding jig of Fig.
[36]
5 and 6 are views for explaining the sliding contact of the lead block of the pair of laser welding jig of Fig.
[37]
7 is a cross-sectional view of the pressure bolts of the laser welding apparatus of Figure 1;
[38]
8 to 11 are views for explaining the welding of a battery module through the laser welding apparatus of Figure 1;
Mode for the Invention
[39]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention; Prior to this, the specification and are not to be construed as limited to the term general and dictionary meanings used in the claims, the inventor accordingly the concept of a term to describe his own invention in the best way It interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that can be defined.
[40]
Accordingly, the configuration shown in the examples and figures disclosed herein are in not intended to in the technical idea of ​​the present merely nothing but the embodiment most preferred embodiment of the present invention invention, a variety that can be made thereto according to the present application point It should be understood that there are equivalents and modifications.
[41]
1 is a view for explaining the welding of a battery module according to an embodiment of the present invention, Figure 2 is a front perspective view of the laser welding jig of the laser welding apparatus of Figure 1, Figure 3 is a laser welding fixture of Figure 2 in a rear perspective view, Figure 4 is a rear view of the laser welding jig of Figure 3, a diagram for explaining a sliding of the lead contact block of the pair of laser welding fixture of Figure 5 and 6 Figure 4, is 7 a cross-sectional view of the pressure bolts of the laser welding apparatus of Fig.
[42]
If Figure 1 to refer to FIG. 8, the battery module 1, and may include at least two or more, that is, a plurality of battery cells 10 and the bus bar unit (30).
[43]
The plurality of battery cells 10 may be provided to the pouch type secondary battery. The plurality of battery cells 10 can be mutually stacked able to be connected to each other electrically. And, there can be a protrusion, each electrode lead (15) of the plurality of battery cells 10.
[44]
The bus bar unit 30 can be connected to the electrode leads 15 and the electrical effort of the plurality of battery cells 10 to and covers one side of the plurality of battery cells 10, a voltage sensing and the like.
[45]
Such a bus bar unit 30, may include a unit body 32, a lead-bus bar 34, the lead slot 36 and the ball tinghom 38.
[46]
The unit main body 32, may be able to cover one side of the plurality of battery cells 10 mounted at one side of the plurality of battery cells 10.
[47]
The lead bus bar 34 is provided at the front of the unit main body 32, a plurality of pieces may be provided. The plurality of lead bus bars 34, respectively, may be connected to the electrode leads 15 and the electrical cross the two battery cells 10. This electrical connection may be performed by a laser through the laser welding device 50 which will be described later welding.
[48]
It said lid slot 36 is formed in the unit main body 32, a plurality of pieces may be provided. The plurality of lead slots 36 may be provided in between the read bus bars (32). Each electrode lead 15 of the battery cell 10 may be protruded by a predetermined length in the forward direction of the unit main body 32 after passing through the respective slot of the leads 36.
[49]
Tinghom the ball 38 is formed in the unit main body 32, a plurality of pieces may be provided. Tinghom (38) of the plurality of balls is disposed in the rear of which will be described later laser welding jig 100, the jig main body 120, the bus bar unit 30 is covered during a plurality of bolt insertion holes 165 to be described later of It can be. These tinghom (38) said plurality of the ball has a plurality of pressure bolts, which is described later laser-welding device 50, 300 may be inserted.
[50]
Hereinafter, examine in detail with respect to the electrode leads 15 and the laser welding device 50 for welding between the lead bus bars 34 of the bus bar unit 30 of such the battery cells 10 .
[51]
The laser welding device 50 may include a laser welding jig 100, pressing the bolt 300 and the laser welding (see 500, Fig. 11).
[52]
The laser welding jig 100, the battery cells 10 of the at least two battery cells 10, the bus bar unit 30, which covers the one side of the electrode leads 15 and the battery cells 10 of the as for the at least one weld to the lead bus bar 34, when the welding may be mounted to the front side of the bus bar unit (30).
[53]
Such the laser welding jig 100 may include a jig body 120, welding the slit 140, the bolt insertion portion 160, and the lead contact block 180.
[54]
The jig main body 120 may cover the bus bar unit 30 during the welding. More specifically, the jig main body 120 may cover the entire surface of the unit body 32 of the bus bar unit 30 during the welding.
[55]
The welding slit 140 is formed on the jig main body 120, a plurality of pieces may be provided. Each welding slits 140, respectively, two electrode leads 15 and the bus bar unit a read bus of the lead bus bars 34 of 30 of the battery cells 10 for the weld wherein the bar 34 jig main body 120 can be exposed out of the front.
[56]
The bolt insertion portion 160 is formed in the jig main body 120, a plurality of pieces may be provided. The plurality of bolt insertion parts 160 are provided in between 140 the plurality of welding the slit, it will be described later, at least one of the bolt insertion holes 165 to be inserted and at least one pressure bolt 300 is provided to can.
[57]
The bolt insertion holes 165 may be provided in plural pieces, the plurality of bolt insertion holes 165, may be disposed mutually spaced apart along the vertical direction of each of the bolt insertion portion 160.
[58]
The lead contact block 180, is provided multiple pieces, the jig rearward, specifically the body 120, may be provided in pairs on the back of each of the bolt insertion portion 160. The said pair of lead contact blocks 180 are described below, at least one of the pressing bolt (300) spaced apart from each other along the insertion electrode leads 15 of the lead bus bar in a respective welding slit 140 (34 ) it can be in close contact with.
[59]
To this end, the leads contact block of the pair 180, may be mounted on the jig main body 120 slidably in the longitudinal direction of the jig main body 120. Specifically, the lead contact block of the pair 180, may be sliding gekkeum be gradually spaced apart from each other in accordance with the at least one pressure bolt 300 inserted. Each of the bolt insertion portion 165, such a pair of the two electrode leads 15 of the lead bus bar within the welding slits 140 according to the sliding of the lead contact block 180 provided on the (34 ) it can be in close contact with.
[60]
This is the case, the above-described lead block in close contact pair 180, and a pair of the insertion guide recess to guide the passage of the pressure bolts 300, which will be described later (185) can be formed.
[61]
Insertion guide grooves 185 of the pair are disposed facing each other, forming the amount of space that the bolt leg 340 of the pressing bolt (300) to be described later prior to the passage of the pressure bolt 300 to pass through , and it may be spaced apart from each other upon insertion of the pressing bolt 300 which will be described later.
[62]
The pressing bolt (300) is, and while inserted into the bolt insertion hole 165 and the ball tinghom 38 can be in close contact with the electrode leads 15 to the lead bus bar 34 is provided dogs plurality have.
[63]
Such a plurality of pressure bolts 300, respectively, may comprise a bolt head (320), the leg bolt 340 and the bolt taper 360.
[64]
The bolt head 320 may have a diameter (B1) corresponding to the inner diameter of the bolt insertion hole (165). The leg bolts 340 can have a diameter (B2) than the diameter (B1) of the bolt head 320. The bolt taper 360, the bolt leg 340 and connects to the bolt head 320, is from the head of the bolt 320 jeomjik typically diameter toward the bolt leg 340 can be formed to be smaller have.
[65]
The welding laser 500 (see FIG. 11) is the lead-bus bar (34 of the electrode leads 15 and the bus bar unit 30 of the battery cells 10 in the 140 of the plurality of welding the slit ) the can by welding connection. For this welding, the laser welding apparatus 500 can investigate the laser for the welding.
[66]
In the following, we see particularly at the more for the welding process of the battery module (1) through such a laser welding apparatus 50.
[67]
8 to 11 are views for explaining the welding of a battery module through the laser welding apparatus of Figure 1;
[68]
8, the operator and the like thereby mounting the laser welding jig 100 of the battery module 1, the laser welding apparatus 50 when welded to the front face of the bus bar unit (30). In this case, the welding of the slit 140, the electrode leads 15 and the lead-bus bar 34 of the laser welding jig 100 may be exposed to the front. Then, the operator, etc. are inserted into the pressure bolts 300 into the bolt insertion hole of the 165 of the bolt insertion parts 160.
[69]
Referring to Figure 9, upon insertion of the side of the bus bar unit 30 of the pressure bolts (300), the lead adhesion block 180 while sliding up bar 34 to the lead bus to the lead bus bar 34 may be proximate to the electrode leads 15 of the two sides.
[70]
10, the worker or the like can be passed through the pressure bolts 300, the by further inserting the pressing bolts 300 to the ball tinghom (38) of the bus bar unit 30, . Thus, the lead contact block 180, while being moved further than the side of the lead bus bar 34 to contact the electrode leads (15) on both sides of the lead bus bar 34 to the lead bus bar 34 can.
[71]
11, in a state in close contact with the electrode leads 15 to the lead bus bar 34 by means of the lead contact block 180, the worker, etc. The welding the welding laser 500 in the slit 140 by laser welding the electrode leads 15 and the lead-bus bar 34 may be connected.
[72]
Thus, the laser welding apparatus 50 according to this embodiment, through the sliding of the leads close contact block 180 of the laser welding jig 100 in accordance with the insertion of the pressing bolt (300), said electrode lead the (15) and the lead bus bar 34 during the welding the laser welding efficiency to reduce the contact more stable in can be more enhanced.
[73]
In addition, in the laser welding apparatus 50 according to this embodiment, the it does not require the bending process of the electrode leads 15 and the lead-bus bar 34. The electrode leads 15 during welding of, the welding process can be easier. Accordingly, in the present embodiment, the time and costs associated with the welding process can be reduced more than.
[74]
In addition, it is possible to reduce the dead space that was unavoidable in the conventional bending process, can produce the battery module (1) according to a recent slimmer than slim the trend of the Delete bending process.
[75]
At least at present, in accordance with various embodiments of the invention, the electrically between the battery cell 10 electrode lead do not form a bend structure (15), the electrode lead 10 of the lead-bus bar 34 connections as It can achieve a reliable bonding with.
[76]
Therefore, in the bonding process for manufacturing a battery module 1 of the present invention, it is possible to by bending the electrode lead 15 is omitted, the work is brought into contact with the read bus bar 34, the bending operation of the electrode lead (15) , to reduce the production cost, it is possible to shorten the operation time as they become unnecessary, and the bending jig configuration.
[77]
Further, according to this aspect of the invention, it is to require more work area for the welding process due to a bent region of the lead-bus bar 34 and the bonding electrode lead 15, which is as in the prior art, manufacturing efficiency is it is possible to prevent the falling problem.
[78]
On the other hand, but the top and bottom, the right and left, the terms indicating the directions such as before, after used herein, these terms may make vary depending on the location of the position and the observer of the targeted object for convenience of explanation, number that will be apparent to those skilled in the art.
[79]
As it described above, but it should be understood that the detailed description and specific examples, the invention is not limited thereto under the technical scope of the present invention by one of ordinary skill in the art various modifications and variations within the equivalent scope of the claims to be described is possible as a matter of course.

Claims

[Claim 1]In at least two laser welding jig for welding at least one of the read bus of the bus bar unit to cover the one side surface of the battery cell and the electrode lead of one battery cell bar, the jig main body that covers the bus bar unit when the weld .; The jig is formed at the main body, in order for the welding with said electrode lead wherein the at least one lead-bus bar to the plurality of welding slit for exposing out of the jig body; Is provided in between the plurality of welding the slit, at least one of the pressure bolt is inserted at least one of the bolt insertion holes are arranged a plurality of bolt insertion portions that are to be; And is provided at a rear portion inserted into each bolt, the pressure bolts are spaced apart from each other in accordance with the insertion of a pair of the leads close to block contact of the electrode leads of the lead bus bar; laser welding jig comprising: a.
[Claim 2]
The method of claim 1, wherein the lead contact block of the pair are, laser welding jig, characterized in that mounted on the jig main body as to be slidable in the longitudinal direction of the jig main body.
[Claim 3]
The method of claim 1, wherein the lead contact block of the pair are, laser welding jig, characterized in that spaced apart from each other gradually in accordance with the insertion of the at least one of the pressing bolt.
[Claim 4]
The method of claim 1, wherein the at least one pressure bolt, the bolt head has a diameter corresponding to the inner diameter of the bolt insertion hole; Bolt leg has a smaller diameter than the bolt head; And said connecting leg and the bolt head and the bolt, the bolt gradually tapered that its diameter becomes gradually small toward the leg bolt from the bolt head; laser welding jig comprising: a.
[Claim 5]
The method of claim 4, wherein, in the reed contact block of the pair are arranged facing each other to form a space of a size that can pass through said bolt legs, at least one being separated from each other upon insertion of the at least one pressure bolt of of the insertion guide recess; laser welding jig, characterized in that this time.
[Claim 6]
The method of claim 4, wherein, in the bus bar unit, disposed in the bus bar unit rearward at least one of the bolt insertion holes when the cover of the jig main body, at least one ball tinghom that the at least one pressure bolt is inserted; the laser welding jig according to claim is provided.
[Claim 7]
The method of claim 1, wherein the welding is laser welding jig, characterized in that laser welding is performed within the plurality of welding slit.
[Claim 8]
In the laser welding device, a laser welding jig according to claim 1; The at least one pressure bolt; Laser welding apparatus comprising; and a welding laser for irradiating a laser for the welding.