Art
[1]The present invention, an electrode as a lead bonding the bus bar assembly and relates to a battery module including the same, to a more particularly to a battery module including the same and a bus bar assembly which can be combined bar bus without bending the electrode lead.
[2]This application claims priority to an application for the Korea Patent Application No. 10-2017-0129091, filed on October 10, 2017, all information disclosed in the specification and drawings of that application is hereby incorporated by reference into this application.
BACKGROUND
[3]
There are now commercially available secondary batteries are nickel-cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, lithium secondary batteries, etc., of which the lithium secondary battery is not to the memory effect hardly occurs as compared to a secondary battery of nickel-based free and can be charged and discharged, Self the 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 with a separator disposed between the electrode assembly and the casing for sealing the housing with the electrode assembly and an electrolyte, that is, the battery case.
[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, it has become a widely used secondary batteries in electric vehicles to secure a driving force using an internal combustion engine and / or electric motor, as well as a small device such as a portable electronic device. The electric vehicle includes a hybrid car, plug-in hybrid vehicle and a pure electric vehicle that is driven only with the electric motor and the internal combustion engine without a battery.
[7]
When used in such an electric car, 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. Thus, typically the battery module / pack for the middle- or large-sized device can be implemented through a serial and / or parallel connection of the pouch type secondary battery.
[8]
On the other hand, the electrode as the lead 20 of the battery module when configuring the pouch type secondary battery 10, and FIG. 1, in which the bending in contact over of the bus bar section and then bonded by this weld (40). Here refers to the bus bar (bus bar) is a bar-like conductor made of a bar shape from a material such as copper, silver, tin-plated copper. The bus bar is frequently used as a wiring member can be in the safe electric current I of the high capacity power supplies, including the battery module, such as an electric vehicle, as compared to copper.
[9]
However, the conventional case, and a plurality of manually by the operator needs to keep the bent shape of the electrode lead 20, the electrode lead 20 by the elastic recovery force of the electrode lead 20 of the metal material as the bus bars there are (30) is not performing well in close contact with the problem.
[10]
In particular, 3 to be placed, because a plurality of electrode lead overlapped when the parallel connection between the four or more electrode lead on the bus bars are more difficult to perform welding, In this case there is also a problem to decrease the welding quality.
Detailed Description of the Invention
SUMMARY
[11]
Accordingly, the present invention SUMMARY OF THE INVENTION This is, by combining the bus bar without bending the electrode lead is an object of the present invention to provide an electrode lead and the battery module that includes a close contact as possible and this bus bar assembly of the bus bar.
[12]
However, the object of the present invention will be able to be clearly understood to those skilled in the art from the description of the invention described below is not limited to the above-described problems, that are not mentioned yet another task are.
Problem solving means
[13]
According to the invention, there is provided a busbar assembly for electrically connecting the plurality of battery cells having an electrode lead, the film provided to the stationary bus bar type conductor formation; The fixed bus bar is disposed of with spaced either side of the stationary bus bar one pairs of mobile bus to form a fitting space for inserting lead electrodes of at least one between a bus bar and the fixed bar; And may be to close to move said pair of mobile busbars bar the fixed bus, the bus bar assembly including a contact member to contact the bar the fixed bus to the electrode leads provided on the condition that the electrode lead is located in the fitting space .
[14]
Mobile bus bar of the pair are each arranged with contact portions that are side by side arranged the fixed bus bar, with the center having parts of the contact bent at both ends to be Spacer extending portion, and the fixed bus bar, to be mutually inter-symmetrical It may be configured so as to surround the periphery of the stationary bus bar.
[15]
The contact member may be a plate spring both ends of which are bonded mobile bus bar of the pair moved in a direction opposite to the pair of bus bars mutually movable between the elastic restoring force.
[16]
The leaf spring has the opposite ends in the end portion of the interval adjusting portions may be coupled to the two are being provided in pairs, face each other in the mobile bus bar of the pair.
[17]
A plate-like structure, provided with a slit in the electrode leads are allowed to pass through at a position corresponding to the fitting space, portable bus bar and the fixed bus of the mobile bus bar of said pair of movable to bar the fixed bus the pair bar may further include a bus-bar support frame for support.
[18]
The bus bar supporting frame, may have a gap interposed between the movable bus bar of the pair of control portions and inserted releasably arranged spacers are projections.
[19]
The bus bar supporting frame, the cavity-holding projections including a cantilever beam having a free end which is located behind the gap adjusting unit further, and may be provided in the free end.
[20]
Viewing the cantilever may further include a pressing projection protruding from the cavity-holding projections spaced apart position.
[21]
The bus bar supporting frame, provided with removable bus bar of said pair further corner brackets adapted to support wrap around the four corners of the movable bus bar of the pair from the furthest spaced to either side of the stationary bus bar can do.
[22]
In accordance with another aspect of the present invention, there can be provided a battery module including the bus bar assembly described above. The battery module may be used as an energy source for an electric vehicle or a hybrid vehicle or the electric power storage device.
Effects of the Invention
[23]
According to the invention, by combining the bus bar without bending the electrode leads it can be provided with a battery module that contains the electrode lead and bus bar assembly can contact the bus bar and it.
[24]
Further, because the electrode lead may be welded together in a pressure state can be improved mechanically parallel connection structure, regardless of the number of electrode lead electrical connectivity and mechanical bonding strength reliability.
[25]
Further, this manual process is removed for the bending of the electrode lead can be improved automated rate of the battery module production line.
[26]
It is not the effect of the present invention be limited to the above-described effects, effects which are not mentioned will be able to be clearly understood to those of ordinary skill in the art from the drawings herein and the appended claims.
Brief Description of the Drawings
[27]
1 is a view schematically showing the joint structure of the electrode leads and the bus bar according to the prior art.
[28]
2 and 3 are perspective views schematically showing the major components and the battery cell stack in the bus bar assembly according to one embodiment of the present invention.
[29]
Figure 4 is a perspective view of the bus bar support frame according to one embodiment of the present invention.
[30]
5 is a perspective view showing the configuration of the bus bar assembly of the electrode lead inserted condition before, according to one embodiment of the present invention.
[31]
Figure 6 is an enlarged view of a main part of FIG.
[32]
Figure 7 is a perspective view showing the configuration of the bus bar assembly of the state after inserting the electrode lead according to one embodiment of the present invention.
[33]
Figure 8 is an enlarged main portion of Fig.
[34]
9 and 10 are views schematically showing the joined front / rear structure of the electrode leads and the bus bar assembly according to one embodiment of the present invention.
Mode for the Invention
[35]
With reference to the accompanying drawings will be described a preferred embodiment of the present invention; Prior to this, the specification and are should not 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.
[36]
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.
[37]
Embodiment of the present invention because it can be of the shape and size of the elements in the drawings are exaggerated, omitted or schematically shown for a more clear description is provided to more completely explain the present invention by ordinary skill. Thus, the size and ratios of each component does not utterly reflect an actual size or scale.
[38]
2 and 3 are perspective views schematically showing the major components and the battery cell stack in the bus bar assembly according to one embodiment of the present invention.
[39]
Referring to these figures, a bus bar assembly (1) has a bus bar assembly (1) for electrically connecting the electrode lead (20) of the plurality of battery cells 10 in accordance with one embodiment of the present invention, the fixed bus number may comprise a bar 100 and a pair of movable bus bar 200, the contact member 300 to the movable bus bar 200, the pair of possible relative movement with respect to the stationary bus bar 100 .
[40]
Electrode lead 20 of the battery cell 10 includes a positive electrode lead 21 and the negative electrode lead 22. Although described later in detail, according to the present invention, the positive electrode lead 21 and the negative electrode lead 22 is directly inserted into the insertion space (S) of the bus bar assembly (1) according to the invention by a bus bar assembly (1) after the end can be welded clamping is performed. Therefore eliminated without need electrode lead 20, the process for bending work as in the prior art can increase the percentage of automated production lines. Further, according to the present invention, even if the mechanical pressure on the I-electrode lead 20 is in a state applied can be welding, bonding the two or more electrode lead 20 in a parallel manner, the reliability of the electrical connections and the mechanical bonding strength It can be maintained.
[41]
In the following detailed look at the bus bar assembly (1) according to this invention.
[42]
First, the fixed bus bar 100 has a copper film having electric conductivity as large, it can be prepared from a material such as tin-plated copper. The fixed bus bar 100 may be securely electric current of high capacity. Positive electrode lead 21 and the negative electrode lead 22 are in close contact and fixed welding bar, such buses can be energized together. For example, a total of six battery cells 10 in a three by one parallel connection configuration, as shown in Figure 2 to Figure 3, the overlapping of the three cathode lead of the battery cell overlapping the negative electrode lead of the other three battery cells the after inserting the insertion space (S) in close contact and welding of the end portions on both sides of the stationary bus bar 100 it can be energized them.
[43]
One pairs of movable bus bar 200 may be provided as a metal such as copper, silver, tin-plated, copper with an electrical conductivity as in the stationary bus bar 100.
[44]
Mobile bus bars 200 of the pair are arranged spaced apart either side of the center with the fixed bus bar 100 is a stationary bus bar 100 in the insertion space (S) between the said stationary bus bar 100 It can be formed. That is, the fitting space (S) is formed where the two either side of the fixed bus bar 100.
[45]
In addition, the mobile bus bars 200 of the pair may be arranged to be movable in the horizontal direction relative to the stationary bus bar 100. One pairs of movable bus bar 200 may be moved close to the stationary bus bar 100 as shown in Figure 3 in spaced-apart arrangement to either side of the stationary bus bar 100 in the state as shown in FIG. Thus, the fitting space (S) is an electrode lead 20 is inserted into this insertion space (S) and that the width can be adjusted according to the horizontal movement of the movable bus bar 200 of the pair are one and the stationary bus bar 100 by the mobile bus bars 200 of the pair may be pressed mechanically.
[46]
More specifically, the movable bus bar 200 according to this embodiment may include an attachment portion 210 and a gap adjusting unit 220, a substantially "c" form.
[47]
Attachment portion 210 may be defined as a portion of side by side disposed in stationary bus bar 100, the spacing portion 220 is bent toward the stationary bus bar 100 on both ends of the attachment portion 210 to be it can be defined as a portion extending.
[48]
The mobile bus bar 200, such is arranged to be symmetrical with each other between two of the stationary bus bar 100 by a pair of dog can take the form surrounding the periphery of the stationary bus bar 100. The two attachment portion 210 and may be fitting space (S) between the two sides of the stationary bus bar 100 is formed, and any one of the gap adjusting unit 220 of the mobile bus bar 200, the other a gap adjusting section 220 of the mobile bus bar 200 may be configured to be able to reach with each other. Therefore, even between mobile bus bars 200 of the pair is the current flow can be made possible. And the width of the insertion space (S) in accordance with the length of the gap adjusting unit 220 can be determined.
[49]
On the other hand, unlike the present embodiment, the movable bus bar 200 may mubang, even though they are provided from a material having electrical conductivity must be so configured to form an insertion space (S) and pressing the electrode lead (20). That is energized between the positive electrode lead 21 and the negative electrode lead 22 is so sufficiently possible to fixed a bus bar (100) movable bus bar 200 may be provided as a fixed bus bar 100 and the other insulating material. When producing a mobile bus bar 200 with an insulating material in an alternative example of this embodiment it may be considered to obtain a better effect in preventing electric short circuit within the battery module side.
[50]
Contact member 300 is configured to enable to close to move the movable bus bar 200, the pair of the stationary bus bar 100, the electrode lead 20 can be in close contact with the fixed bus bar 100.
[51]
Of this embodiment contact member 300 may be a leaf spring 300 to move in a direction that both ends of which are coupled to the movable bus bar 200, a pair of mutually opposing a pair of movable bus bar 200 of the elastic restoring force have.
[52]
For example, referring again to Figure 3 and Figure 2, the leaf spring 300 may be coupled to the gap adjusting unit 220 of the mobile bus bar 200, wherein one end of the leaf spring 300, a left movable bus the bars 200, the other end may be coupled to the right movable bus bar 200. More specifically, the leaf spring 300 and the two are provided as a pair, the respective end portions is coupled to the end portion of the gap adjusting unit 220 which face each other in the upper and lower portions of the stationary bus bar 100.
[53]
This plate spring 300, as shown in FIG. 2, this disappears beolryeojin state was the external force as shown in Figure 3 by any external force, is blown bunched back to the original state by the elastic restoring force. Mobile bus bar 200 may be by the action of the leaf spring 300 to move closer to the stationary bus bar 100.
[54]
4 is a main perspective view showing a configuration of a busbar support frame perspective view of the Figure 5 and 6 are in one embodiment around the insertion electrode lead according to the example state of the present invention, the bus bar assembly according to one embodiment of the present invention and its partial enlarged view, FIG. 7 and FIG. 8 is a perspective view an embodiment showing the construction of the bus bar assembly of the state after insertion of the electrode lead and the main part enlarged view of the present invention.
[55]
Referring to these figures, the bus bar assembly (1) according to the present invention, the support frame (400 to provide a place to be supported mobile bus bar 200, the pair of the stationary bus bar 100 in the above-described bus bar ) it can be further included.
[56]
Bus bar support frame 400 may be attached to the front / back of the battery cell 10 is a laminate. For example, the battery cell stack can be accommodated in a module housing (not shown). The module housing can be provided in each pipe forms the front / back of the opening, the bus bar support frame 400 is coupled to the front / back of this module housing may be located in the front / rear surface of the battery cell stack .
[57]
4, the busbar support frame 400 is a plate-like structure, the fixed bus bar 100 and a pair of movable bus bar electrode lead at a position corresponding to the insertion space (S) between 200 provided with a slit (410) that (20) can pass, mobile bus bar 200 of the pair is configured to be able to support the bus bars so as to be movable horizontally with respect to the stationary bus bar 100 .
[58]
To this end, the bus bar support frame 400 may further comprise a gap holding projections 420, the cantilever beam 430 and the corner bracket (450).
[59]
First, a configuration which serves to the spacing projections 420 by spaced a fitting space one pairs of movable bus bar 200 so that it can be sufficiently secured (S) to either side of the stationary bus bar 100.
[60]
Figures 5 to 8, the cavity-holding projection 420 may be inserted and arranged to be releasably inserted between the pair of movable bus bar 200 Spacer 220 of.
[61]
That is, the spacing projections 420 may be interposed between the gap adjusting section 220 of the mobile bus bar 200 is pulled out away from each other. The spacing projections 420, the gap adjusting unit by being able wedged between 220 leaf spring 300 is can be maintained in beolryeojin state thereby secure a sufficient insertion space (S) and a plurality of electrode leads (20) It can be inserted into them.
[62]
And can be released spacing projections 420 provided on the cantilever beam 430 is lightly press the cantilever beams 430, main surface spacing protrusion 420 is inserted between the gap adjusting section 220.
[63]
Cantilever beam 430 is at one end fixed and the other end may be located at the rear of the gap adjusting unit 220, the free end as the beam which is in a free end state. The cantilever beam 430 may be provided in the form of a cutting plate surface portion of the bus bar support frame 400 and may be provided with a spacing projection 420, the free end.
[64]
In addition, the cantilever beams 430 may further include a pressing projection 440 for being protruded in a position spaced with the spacing projections (420). For pressing the projection 440 is configured to give more easily press the cantilever beams (430). For example, the electrode lead 20 is welded around the welding jig (not shown) by keeping the pressing projection 440, the portion is pressed for a cantilever beam 430 As aside back spacing protrusion 420 is movable bus bar 200 Spacer 220 falls between the plate have spacing adjusting unit 220 by resilient restoring forces of the action of the movable bus bar 200 of the spring 300 may come into contact with each other. In this case, the fitting space is narrowed (S) the electrode lead (20) interposed thereto may be tightly adhered to the movable bus bar 200, a pair of stationary die and the bus bar 100.
[65]
On the other hand, the fixed bus bar 100, but configured to be fixedly attached to the bus bar support frame 400, the movable bus bar 200 is configured to be attached to allow one fluid to the busbar support frame 400 .
[66]
Corner brackets 450 of the bus bar support frame 400 serves to support the movable bus bar 200, while allowing the flexibility of this movable bus bar 200.
[67]
Corner bracket 450 in this embodiment is a total of four, the four corner brackets (450) are located in the corner portion of the movable bus bar 200 and restrain the bus bar mobile 200 allows flow. More specifically, a corner bracket 450, a pair of movable bus bar 200 is fixed bus the furthest spaced to either side of the bar 100, that is, mobile bus of the pair in a state where the cavity-holding projection 420 is fitted It may be configured to surround the four corners of the bar 200. That is, the four corner brackets (450) are flow allow as much space as a pair of, but constraining the movable bus bar 200 to the up, down, left, and right, for example, the spacing projections 420 Fell represented by D in FIG. 8 in a state to bring it is possible that the flow of the mobile bus bar 200 in the space of the flow allows the corner bracket 450.
[68]
Then 9 to work and the electrode lead 20 of the bus bar assembly (1) according to the present invention with reference to Figure 10. We know the method of joining briefly. The present embodiment is an example in which parallel connections of the battery cells 3 and each junction of these positive electrode lead 21 and the negative electrode lead 22 to the bus bar assembly (1).
[69]
First, a sufficient fitting space (S) of the bus bar assembly (1) as shown in FIG. In this case, to sufficiently secure the fitting space (S) by placing the mobile bus bar 200 by pulling maintenance interval to interval adjustment unit 220, the space between the movable bus bar 200, the projection 420 as described above can.
[70]
As a thereby following, inserted into the ends of the positive electrode lead 21 and the negative electrode lead end 22 of the respective fitting space (S). The fitting space (S) is the side where the two sides relative to the stationary bus bar 100. Only to each packet of the unit end of the positive electrode lead 21 and the negative electrode lead 22 is then inserted into the insertion space (S).
[71]
Then, the close contact of the pair of movable bus bar 200 is a stationary bus bar by close-up moves to the positive electrode lead 21, 100, and negative electrode leads 22 as shown in Figure 10 to the stationary bus bar 100 . When words, pulled out from between the welding jig pressing the cantilever beam 430 with a (not shown), the spacing projections 420, a pair of movable bus bar 200. At this time, the pair of movable bus bar 200 includes a plate by the elastic restoring force of the spring 300 is moved in the directions opposite to each other the ends of the end and the anode lead 22 of the positive electrode lead 21 is fixed integrally It may be pressed between the bus bar 100 and the movable bus bar 200. In this state, welding is performed on the positive electrode lead 21 and the negative electrode lead 22. The
[72]
Such a bus bar assembly according to (1) Structure and operation according to the present invention, unlike the prior art (see Fig. 1), the electrode lead 20 does not require at all the electrode lead 20, a bending process in the welding process. Therefore, the manual process for the bending of the electrode lead (20) is removed can be improved automated rate of the battery module production line.
[73]
In addition, it can be a lead electrode 20 of the integral, so they can be welded in a pressure state to mechanically improve the parallel connection structure in the number and independent of the electrical connections and the mechanical bonding strength reliability of the electrode lead (20).
[74]
On the other hand, the battery module according to the invention can be configured to include the above-mentioned bus bar assembly (1). In addition, the battery module includes a battery cell stack, the module housing for housing said battery cell stack (not shown), various devices for controlling the charging and discharging of the battery cell, for example, (Battery Management System) BMS, current sensors, fuses, etc. the may further include. The battery module may be used as an energy source for an electric vehicle or a hybrid vehicle or the electric power storage device.
[75]
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.
[76]
On the other hand, that although using the up, down, left, Wo term for the same direction herein, such terms are intended only for the convenience of description, it can vary depending on the location of the position and the observer of the object to be subjected to the present invention it is obvious to the person skilled in the art.

Claims

[Claim 1]A busbar assembly for electrically connecting the plurality of battery cells having an electrode lead, the film stationary bus bar provided in the form of large conductor; The fixed bus bar is disposed of with spaced either side of the stationary bus bar one pairs of mobile bus to form a fitting space for inserting lead electrodes of at least one between a bus bar and the fixed bar; And a bus bar assembly comprising: a close contact member by removable bus bars of the pair move closer bar the fixed bus while the electrode leads are located in the fitting space which contact the bar the fixed bus to the electrode lead.
[Claim 2]
The method of claim 1, wherein the mobile bus bar of said pair is provided with each of the close contact portion that is parallel to establish the fixed bus bar, to be bent from both ends of the contact of the extension Spacer formed parts, with the center corresponds to the fixed bus bars are disposed to be mutually symmetrical cross-bus bar assembly, characterized in that surrounding the periphery of the stationary bus bar.
[Claim 3]
The method of claim 2 wherein said contact member is a bus bar assembly, characterized in that the leaf spring which both ends are coupled bar movable bus of the pair moved in a direction opposite to the pair of movable bus bars cross between the elastic restoring force .
[Claim 4]
The method of claim 3, wherein the plate spring includes a bus bar assembly characterized in that the two are being provided, the opposite ends coupled to the end portion of that face each other in the mobile bus bar of the pair of the spacing portions of a pair.
[Claim 5]
The method of claim 4, wherein a plate-like structure, provided with a slit in the electrode leads are allowed to pass through at a position corresponding to the fitting space, of the mobile bus bar of said pair of movable to bar the fixed bus the pair Mobile bus bar and the bus bar assembly according to claim 1, further comprising a busbar support frame for supporting the stationary bus bar.
[Claim 6]
The method of claim 5, wherein the busbar support frame is provided with a bus bar assembly comprising the insert and the insertion spacing is releasably provided between the projection distance of the mobile bus bar of the pair of control portions.
[Claim 7]
Of claim 6, wherein the bus bar supporting frame, further comprising beam cantilever having a free end which is located behind the gap adjusting unit, maintaining the spacing projections bus bar assembly, characterized in that provided at the free end.
[Claim 8]
The method of claim 7 wherein the bus bar assembly characterized in that viewing the cantilever, further comprising a pressing projection protruding from the spaced projection and maintain the spacing position.
[Claim 9]
The method of claim 5, wherein the busbar support frame, adapted to support mobile bus bars of the pair of wrap around the four corners of the movable bus bar of the pair from the furthest spaced to either side of the stationary bus bar bus bar assembly according to claim 1, further comprising a bracket provided with a corner.
[Claim 10]
To claim 1, wherein the battery module comprises a bus bar assembly according to claim 2.