KR102523946B1 - Busbar frame and battery module having the same - Google Patents

Abstract

A battery module disclosed in one embodiment of the present invention comprises: a cell array where battery cells with electrode leads on both sides are stacked; a first bus bar frame disposed on one side of the cell array and having a plurality of bus bars where one side electrode leads of the battery cells are bonded and electrically connected; and a second bus bar frame disposed on the other side of the cell array and having a plurality of bus bars where the other side electrode leads of the battery cells are bonded and electrically connected, wherein at least one bus bar of the first and second bus bar frames includes: at least one lead hole where the electrode lead is drawn out; and at least one lead connection portion disposed on one side or the other side of the lead hole, wherein a contact portion of the electrode lead comes in contact, wherein the lead connection portion may be inclined relative to a virtual straight line extending in a longitudinal direction of the battery cell. Accordingly, the bonding force between the inclined bus bar and the lead of the battery cell can be improved.

Description

Bus bar frame and battery module having the same {BUSBAR FRAME AND BATTERY MODULE HAVING THE SAME}

An embodiment of the invention relates to a bus bar frame and a battery module having the same.

In recent years, as the demand for portable electronic products such as laptop computers, video cameras, and mobile phones has rapidly increased, and the development of electric vehicles, batteries for energy storage, robots, and satellites has been in full swing, high-performance secondary batteries that can be repeatedly charged and discharged Research on this is actively progressing.

Currently commercially available secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. It is in the limelight because of its very low self-discharge rate and high energy density.

These lithium secondary batteries mainly use lithium-based oxides and carbon materials as positive electrode active materials and negative electrode active materials, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with such a positive electrode active material and a negative electrode active material are disposed with a separator therebetween, and an exterior material that seals and houses the electrode assembly together with an electrolyte, that is, a case.

In general, lithium secondary batteries can be classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can and a pouch-type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of a case.

Recently, secondary batteries have been widely used not only in small devices such as portable electronic devices, but also in medium and large devices such as automobiles and power storage devices. In particular, as carbon energy is gradually depleted and interest in the environment increases, public attention is focused on hybrid vehicles and electric vehicles around the world, including the United States, Europe, Japan, and Korea. In such a hybrid vehicle or an electric vehicle, the most essential part is a battery pack that provides driving force to a vehicle motor. Since hybrid vehicles and electric vehicles can obtain vehicle driving force through charging and discharging of the battery pack, the number of users is gradually increasing in that they have excellent fuel efficiency and do not emit or reduce pollutants compared to vehicles using only engines. am. In addition, the battery pack of such a hybrid vehicle or electric vehicle includes a plurality of secondary batteries, and the plurality of secondary batteries are connected in series or parallel to each other to improve capacity and output.

The serial connection or parallel connection between these secondary batteries may be determined in various forms depending on the output, capacity, structure, and the like of the battery pack in consideration of the device to which the battery pack is applied. Accordingly, the secondary batteries are connected in various series and parallel connections to form a battery module, and one or more battery modules may be included in the battery pack.

Such a secondary battery is configured in the form of a battery module or battery pack in which a plurality of unit cells are stacked due to the need for high power and large capacity. As such, since a plurality of unit battery cells must be configured to be electrically connected in series or parallel, there is a problem in that the structure of the battery module becomes complicated.

Connection of leads of battery cells is performed through bolting, welding (laser, ultrasonic, etc.), contact, and the like. In this case, since the cell lead is bent and attached to the bus bar and then joined, a problem in that the electrode lead is separated from the bus bar or opened may occur.

For example, in the prior art, battery cell leads are bent and attached to bus bars at right angles and then welded.

At this time, since the end of the battery cell is bent at 90 degrees and welded, a fire may occur due to a short circuit between adjacent lead electrodes.

In addition, according to the prior art, there is a problem in reliability because damage to the electrode lead may occur due to the bending of the electrode lead by 90 degrees.

In addition, according to the prior art, when the electrode leads are bent at 90 degrees, there is a problem in that the electrode leads are separated from the bus bar, and thus the electrical contact force may be reduced or electrical disconnection may occur.

The present invention provides a bus-bar, a bus-bar frame, and a battery module in which at least one or two or more cell leads among a plurality of battery cells can be attached to an inclined bus-bar.

The present invention provides a bus bar, a bus bar frame, and a battery module in which a plurality of bus bars have an inclined bonding portion based on an imaginary straight line extending leads of the battery cells.

In the bus bar frame according to an embodiment of the present invention, a first bus bar frame having a plurality of bus bars electrically connected to one electrode lead of a battery cell is disposed on the other side of the battery cell and the other electrode lead of the battery cell is bonded. and a second bus bar frame having a plurality of electrically connected bus bars, wherein at least one bus bar of the first and second bus bar frames has at least one lead hole through which an electrode lead of the battery cell is drawn; and It may include at least one lead connection part disposed on one side or the other side of the lead hole and contacting an end of an electrode lead of the battery cell.
At least one bus bar of the first and second bus bar frames is disposed on at least one lead hole through which an electrode lead of the battery cell is drawn, and one side or the other side of the lead hole, and an end of the electrode lead of the battery cell It may include at least one lead connection part drawn out from the lead hole and brought into contact therewith.
The lead connection parts of the first and second bus bar frames may be inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell.
The inclined lead connection part is formed by extending obliquely from the inner contact part and the inner contact part in which the end of the electrode lead of the battery cell is drawn out from the lead hole to start contact, and contacts the end of the electrode lead of the battery cell. It may include an outermost contact that ends.
The inclined outermost contact part of the lead connection part may be disposed higher than the inner contact part of the lead connection part inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell.

The lead connection parts of the first and second bus bar frames may be inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell.

One end of the lead connection portion may have a concave or convex curve shape along the length direction of the lead hole.

One side and the other side of the lead connection portion may have first and second bending portions connected to the support portion of the bus bar and bent.

A protrusion protruding in a direction farther from the battery cell may be provided at the other end of the lead connection part.

In addition, the battery module according to an embodiment of the present invention includes a cell array in which battery cells having electrode leads on both sides of each are stacked; a first bus bar frame disposed on one side of the cell array and having a plurality of bus bars electrically connected to one side electrode leads of the battery cells; and a second bus bar frame disposed on the other side of the cell array and having a plurality of bus bars to which the other side electrode leads of the battery cells are attached and electrically connected, wherein at least one bus bar frame of the first and second bus bar frames The bar includes at least one lead hole through which the electrode lead is drawn, and at least one lead connection part disposed on one side or the other side of the lead hole and contacting an end of the electrode lead, wherein the lead connection part has a length of the battery cell. It may be inclined with respect to an imaginary straight line extending in the direction.

According to an embodiment of the present invention, one end of the lead connection part may be disposed closer to the battery cell than the other end.

According to an embodiment of the present invention, one end of the lead connection part may be disposed long in the longitudinal direction of the lead hole.

According to an embodiment of the invention, one end of the lead connection portion may have at least one of a straight line shape, a concave curve shape, or a convex curve shape along the length direction of the lead hole.

According to an embodiment of the present invention, one side and the other side of the lead connection portion may have first and second bending portions connected to the support portion of the bus bar and bent.

According to an embodiment of the present invention, two or more of the lead connection units may be disposed on each bus bar.

According to an embodiment of the present invention, the lead connection part may have a plurality of lead connection parts inclined in one direction on one of the first bus bar frame and the second bus bar frame.

According to an embodiment of the present invention, the lead connection part may have a plurality of lead connection parts inclined in one direction and the other direction on at least one of the first bus bar frame and the second bus bar frame.

According to an embodiment of the present invention, the first bus bar frame may further include bus bars each having an external terminal at one side of the lead connection part.

According to an embodiment of the invention, the other end of the lead connection portion may have a protrusion protruding in a direction farther from the battery cell.

According to an embodiment of the present invention, the lead connection unit may include a coupling lead in which two or more electrode leads of the battery cells are coupled.

According to an embodiment of the present invention, the bus bar includes a plurality of lead connection parts, and one of the plurality of lead connection parts is disposed with a coupling lead in which two or more electrode leads of the battery cells are coupled, and the other one is one An electrode lead of a battery cell of may be disposed.

An embodiment of the present invention may improve adhesion between an inclined bus bar and a lead of a battery cell.

In addition, embodiments of the present invention can prevent an open defect between an inclined bus bar and a lead of a battery cell, and can improve durability.

In addition, embodiments of the present invention can improve electrical reliability of the bus bar, the bus bar frame, and the battery module.

For example, in the embodiment, a battery electrode lead is minimized or prevented from being extended to an adjacent area by a bus bar frame structure having an inclined lead connection, resulting in a fire due to a short circuit problem between adjacent electrodes having different polarities. has a technical effect that can solve problems that may arise.

In addition, according to the embodiment, the electrode lead may be damaged due to the electrode lead being bent at 90 degrees due to the bus bar frame structure having the inclined lead connection part, so there is a technical effect of significantly improving reliability or durability.

In addition, according to the embodiment, there is a technical effect of improving electrical adhesion and battery characteristics by improving the contact area between the electrode lead and the bus bar by the bus bar frame structure having an inclined lead connection part.

1 is an exploded perspective view of a battery module according to an embodiment of the present invention.
FIG. 2 is a view showing an example of coupling first and second bus bar frames to both sides of the battery pack of FIG. 1 .
FIG. 3 is a diagram explaining an example of connection between the battery cells of FIG. 1 and first and second bus bar frames.
4 is an example of the battery cell of FIG. 3 .
5 is a perspective view showing a portion of a front side first bus bar frame according to an embodiment of the present invention.
6 is an example of a plan view of the first bus bar frame of FIGS. 3 and 5;
FIG. 7 is an example in which electrode leads of a battery cell are coupled to bus bars of first and second bus bar frames of FIG. 3 .
FIG. 8A is a side cross-sectional view illustrating an example in which the bus bar of FIG. 7 and electrode leads of a battery cell are bonded.
FIG. 8B is a diagram for explaining an example in which electrode leads of a battery cell are bonded to the bus bar of FIG. 8A.
FIG. 9 is an example illustrating an inclined structure between an adhesive portion of a bus bar and an electrode lead of a battery cell in FIG. 8B.
10 is an example in which one end of the bonding portion of the bus bar in FIG. 9 has a curved surface.
11 is an example in which the other end of the bus bar in FIG. 9 protrudes.
12 is a diagram explaining an inclination direction of a bus bar in a first frame according to an embodiment of the present invention.
13 is a view showing an example in which leads of two battery cells are bonded on a bus bar as another example of the invention.
14(A)-(C) is a view showing one end of a bus bar in the lead hole of the first and second bus bar frames according to an embodiment of the present invention.
15 is a diagram for explaining a vehicle having a battery module according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, since the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, various alternatives may be used at the time of this application. It should be understood that there may be equivalents and variations. Like reference numerals in the drawings indicate like elements.

In the embodiments described below, the secondary battery refers to a lithium secondary battery. Here, the lithium secondary battery is a generic term for a secondary battery in which lithium ions act as operating ions to induce an electrochemical reaction between a positive electrode plate and a negative electrode plate during charging and discharging.

On the other hand, even if the name of the secondary battery is changed depending on the type of electrolyte or separator used in the lithium secondary battery, the type of battery case used to pack the secondary battery, and the internal or external structure of the lithium secondary battery, the lithium ion is the operating ion. Any secondary battery used as a battery should be interpreted as being included in the category of the lithium secondary battery.

The present invention can also be applied to other secondary batteries other than lithium secondary batteries. Therefore, even if the operating ion is not lithium ion, any secondary battery to which the technical idea of the present invention can be applied should be interpreted as being included in the scope of the present invention regardless of its type.

1 is an exploded perspective view of a battery module according to an embodiment of the present invention, FIG. 2 is a view showing an example of coupling first and second bus bar frames, which are bus bar frames of the battery pack of FIG. 1, and FIG. It is a view explaining an example of connection between battery cells and first and second bus bar frames, FIG. 4 is an example of the battery cell of FIG. 3, and FIG. 5 is a portion of the first front bus bar frame according to an embodiment of the present invention. FIG. 6 is an example of a plan view of the first bus bar frame of FIGS. 3 and 5, and FIG. 7 is an example in which electrode leads of a battery cell are coupled to bus bars of the first and second terminal frames of FIG. 3 8A is a side cross-sectional view for explaining an example of bonding the electrode leads of the battery cell to the bus bar of FIG. 7, and FIG. 8B is a view for explaining an example of bonding the electrode leads of the battery cell to the bus bar of FIG. 8A. , and FIG. 9 is an example illustrating the inclined structure between the bonding portion of the bus bar and the electrode lead of the battery cell in FIG. 8B.

1 to 4, a battery module according to an embodiment of the present invention includes a cell array 100 having a plurality of battery cells 110, and first and second bus bars on both sides of the cell array 100. Frames 210 and 220 and a top frame 230 may be included. Here, a module case and a frame assembly (not shown) may be coupled to the top frame 230, and a module cover (not shown) may be coupled to each outer side of the bus bar frames 21 and 220. Also, the battery module may include a voltage sensing unit (not shown).

The cell array 100 may be an assembly of battery cells 110 in which a plurality of battery cells 110 are stacked. For example, the battery cells 110 may be erected in the second direction (Y) or length direction, and stacked in the first direction (X) or thickness direction to form the cell array 100 . Here, the battery cells 110 are pouch-type secondary batteries, and are bi-directional pouches in which the first electrode lead 131 and the second electrode lead 141 extend in opposite directions along the length of the battery cell 110. type secondary battery (see FIG. 4).

As shown in FIG. 4 , the length of each battery cell 110 may be twice or more than the width, and the thickness may be less than the width. A first electrode lead 131 and a second electrode lead 141 are disposed at both ends of the battery cell 110 in the longitudinal direction, and the first and second electrode leads 131 and 141 may be positive and negative electrodes. The battery cell 110 may include a case 130 accommodating the electrode assembly 120 and a lead film 106 for insulation between the electrode leads 131 and 141 and the case 130 .

The case 130 may be composed of two exterior materials, and a concave inner space may be formed in at least one of them. The electrode assembly 120 and the electrolyte may be accommodated in the inner space of the case 130 . Sealing parts (not shown) are provided on the outer circumferential surfaces of the two cases 130 and the sealing parts are fused to each other, so that the inner space in which the electrode assembly 120 is accommodated can be sealed. Electrode leads may be attached to the electrode assembly, and the electrode leads 131 and 141 may function as electrode terminals of a secondary battery by being exposed to the outside of the case 130 .

In the battery cell 110 according to the embodiment, a pair of electrode leads 131 and 141 composed of an anode lead and a cathode lead are deflected from the center of the battery cell 110 in the width direction to one side. In other words, with reference to FIG. 3 , the pair of electrode leads 131 and 141 are biased from the center in the width direction (Z-axis direction) of the battery cell 110 to one side, but in the height direction of the cell array 100 ( along the Z-axis direction) and is deflected downward.

As shown in FIG. 3 , in the battery module, groups of two or more battery cells 110 may be connected in series. For example, 2 to 5 groups of battery cells may be connected in parallel, and the battery cell groups may be connected to each other. can be connected in series. For example, 2 to 4 battery cell groups may be connected in parallel and may be connected in series with adjacent battery cell groups. The battery cell group may be defined as a cell bank. The battery cells 110 may be stacked to provide the cell array 100 , and an adhesive, such as a thermally conductive adhesive, may be bonded between the battery cells 110 .

As shown in FIG. 2 , the first bus bar frame 210 is coupled to one side of the cell array 100 in the longitudinal direction, and the second bus bar frame 220 is coupled to the other side of the cell array 100 in the longitudinal direction. can The first and second bus bar frames 210 and 220 have a support plate 250 at the bottom thereof to prevent the cell array 100 from sagging. The first bus bar frame 210 may be a front frame, and the second bus bar frame 220 may be a rear frame.

The first bus bar frame 210, the second bus bar frame 220, and the top frame 230 have sizes corresponding to the front, rear, and top surfaces of the cell array 100, respectively, and cover corresponding portions. The first bus bar frame 210 and the second bus bar frame 220 are provided to be rotatable with respect to the top frame 230, and thus the cell array 100 and the frames 210, 220, and 230 are easily assembled. can do

For example, a hinge coupling structure in which the first bus bar frame 210 and the second bus bar frame 220 rotate with respect to the top frame 230 may be included. That is, the first bus bar frame 210 and the second bus bar frame 220 are hinged to one end and the other end of the top frame 230, respectively. Specifically, at least one hinge shaft 211 is provided at the top of the first bus bar frame 210 and the second bus bar frame 220, and the hinge shaft 211 is provided at both ends of the top frame 230 A loop may be provided that can be fitted and wrapped around. For example, the assembly process of the cell array 100 and the bus bar frame may proceed as follows. First, a bus bar frame assembly (not shown) is overlaid on the cell array 100, or, on the contrary, the bus bar frame assembly is placed below and the cell array 100 is seated thereon, and then the first bus bar frame 210 ) and the second bus bar frame 220 to rotate the electrode leads 131 and 141 of each battery cell 110 through the lead holes formed in the first bus bar frame 210 and the second bus bar frame 220. It can be passed through and bonded. Then, electrode leads 131 and 141 of the battery cells 110 are folded and welded to the surfaces of the corresponding bus bars to connect all of the battery cells 110 in series and/or in parallel, and then the cell array 100 and the bus bar frame are connected. The assembly can be assembled.

The battery module may further include a voltage sensing unit 400 for sensing voltage information of the battery cells 110 . The voltage sensing unit 400 includes a substrate member 410 and a connector member 420 . The substrate member 410 extends along the longitudinal direction of the cell array 100 between the top frame 230 and the upper surface of the cell array 100 and includes sensing terminals 411 and 412 attached to bus bars. Such a substrate member 410 may be implemented as a flexible printed circuit board.

The sensing terminals 411 and 412 are the first sensing terminals 411 attached to each bus bar of the bus bar member 210A located on the first bus bar frame 210 and the bus bar located on the second bus bar frame 220 It includes second sensing terminals 412 attached to each of the bus bars 222 of the member 220A, and senses the voltage value at each of the bus bar members 210A and 220A. The battery module of the embodiment is configured such that 12 or more battery cells 110 are connected in parallel in a bundle of two, and the battery cells 110 in each bundle are connected in series via bus bar members 210A and 220A. The bus bar members 210A and 220A can be regarded as corresponding to nodes between the battery cells 110 connected in series, and the first and second sensing terminals 411 and 412 are attached to these bus bars so that the battery cells ( 110) detects the node voltage between them. Voltage data sensed by each of the sensing terminals 411 and 412 may be transmitted to a battery management system (BMS) through the board member 410 and the connector member 420, and the BMS (not shown) may be based on the collected voltage data. The charging and discharging of the battery cells 110 may be controlled.

The substrate member 410 may further include temperature sensors 430a and 430b. Since the battery cell 110 has the highest temperature around the electrode leads 131 and 141 , it is preferable that the temperature sensors 430a and 430b be positioned at both edges of the cell array 100 . Temperature data sensed by the temperature sensors 430a and 430b may be transmitted to the BMS through the board member 410 and the connector member 420 like voltage data.

The first and second bus bar frames 210 and 220 are vertically disposed on one side and the other side of the cell array 100, and can support and protect the cell array 100 by closely contacting it together with other module covers and module cases. there is.

The first bus bar frame 210 may include two or more, for example, three or four bus bars, and the second bus bar frame 220 may include two or more, for example, three or four bus bars. can do. The number of bus bars of the first bus bar frame 210 may be greater than the number of bus bars of the second bus bar frame 220 .

As shown in FIG. 3 , each of the first and second bus bar frames 210 and 220 may include bus bar members 210A and 220A. The bus bar members 210A and 220A may be electrically connected to electrode leads 131 and 141 of the battery cells 110 . The bus bar members 210A and 22OA may be defined as components that form electrical wires by being connected to the electrode leads 131 and 141 of the battery cell 110 . The bus bar members 210A and 220A may connect electrode leads 131 and 141 of adjacent battery cells in series or parallel. That is, the bus bar members 210A and 220A may connect electrode leads 131 and 141 having the same polarity or different polarities. The bus bar members 210A and 22OA may connect the electrode leads 131 and 141 of each cell group with the same polarity, and may connect the electrode leads 131 and 141 of adjacent cell groups with different polarities.

Here, the first bus bar member 21OA is disposed within the first bus bar frame 210 and may include two or more bus bars 211 , 212 , 213 , and 214 . Among the two or more bus bars 211, 212, 213, and 214, the first bus bar 211 having the first external terminal 216 may be defined as the first terminal bus bar, and the last bus bar having the second external terminal 217 ( 214) may be defined as the second terminal bus bar. The first and second terminal bus bars 211 and 214 may be disposed on one side of the first bus bar frame 210 . Although the first and second external terminals 216 and 217 have been described as being disposed on one side of the battery module, they may be disposed on both sides. The first external terminal 216 is bent outward from the first terminal bus bar 211 and functions as a terminal unit, and may have a first coupling hole 216A therein. An external bus bar may be coupled through the first coupling hole 216A. The second external terminal 217 is bent outward from the second terminal bus bar 214 and functions as a terminal unit, and may have a second coupling hole 217A therein. An external bus bar may be coupled through the second coupling hole 217A. The external bus bar may include wires connecting external inputs or battery modules.

The second bus bar member 220A is disposed within the second bus bar frame 220 and may be disposed as two or more bus bars 222 .

Each of the bus bar members 210A and 220A includes a single-layer or multi-layer metal material and may be made of a metal having high electrical conductivity. The metal material may include at least one or a plurality of aluminum, copper, nickel, and stainless materials. In addition, an adhesive material having high thermal conductivity may be included between the multi-layered metal materials, but is not limited thereto.

The first and second bus bar frames 210 and 220 are provided with a plurality of lead holes 25 and 25A, and electrode leads 131 and 141 of the battery cells 110 are provided through the plurality of lead holes 25 and 25A. Each can be withdrawn. The lead holes 25 and 25A are provided as first lead holes 25A disposed within the bus bars 210A and 222, or second lead holes disposed outside or between the bus bars 210A and 222. It may include a lead hole 25B, and may be formed with a length and thickness into which the electrode leads 131 and 141 can be inserted.

Hereinafter, for convenience of description, the first bus bar frame 210 will be mainly described, and the second bus bar frame 220 will refer to the description of the first bus bar frame 210, and the external terminal There may be no structure.

As shown in FIG. 5, an insulating film 202 of the insulator 201 of the first bus bar frame 210 is disposed between the adjacent bus bars 211, 212, 213, and 214, so that the adjacent electrode leads 131 and 141 can block interference.

The bus bars 211 , 212 , 213 , and 214 may include a support part 20 , at least one lead hole 25 and 25A, and a lead connection part 21 . The support part 20 may surround the lead holes 25 and 25A or may be disposed on both sides of the lead holes 25 and 25A. The support part 20 of each bus bar may be made of one part or separated into two or more parts. That is, the two or more parts may be electrically connected to the lead connection part 21 by further disposing separate coupling parts on both sides of the lead holes 25 and 25A.

At least one or a plurality of lead connection parts 21 are disposed on the bus bars 211, 212, 213, and 214, and the lead connection parts 21 may be disposed on one side or the other side of the lead holes 25 and 25A. That is, the plurality of lead connection parts 21 may be disposed on one side of each of the electrode leads 131 and 141, disposed on the other side, or mixedly disposed on one side and the other side.

At least one or a plurality of lead connection parts 21 in the bus bars 211, 212, 213, and 214 have a long length in the same direction as the longitudinal direction of the lead holes 25 and 25A, and a predetermined width in a direction perpendicular to the longitudinal direction. can have A width of the lead connection part 21 may have a width at which the electrode leads 131 and 141 can be bonded and bonded.

Here, as shown in FIG. 9 , the lead connection part 21 of the bus bars 211 , 212 , 222 , and 214 may provide an inclined surface, and the inclined surface is the extension direction of the electrode leads 131 and 141 or the battery cell 110 . It may be disposed at a first angle R1 based on an imaginary straight line extending along the longitudinal direction.

For example, the first angle R1 may be less than an acute angle, for example, 90 degrees, for example, 10 to 89 degrees or 20 degrees to 80 degrees, preferably 60 degrees to 80 degrees. If the first angle R1 is larger than the range, contact portions of the electrode leads 131 and 141 may be peeled off or adhesive strength may deteriorate. If the first angle R1 is smaller than the range, there may be a problem in that the size of the bus bar increases in the height direction. there is.

After the lead holes 25 and 25A are formed in the bus bars 211 , 212 , 222 , and 214 , the lead connection portion 21 is bent using bending equipment. In this case, in the bending direction, one end of the lead connecting portion 21 may be inclined lower than the other end, that is, a portion into which the electrode leads 131 and 141 to be bonded are inserted may be inclined lower than the opposite side. One end of the lead connection part 21 may be disposed closer to the battery cell 110 than the other end.

The bus bars 211, 212, 222, and 214 include first and second bending parts 23 and 24 on both sides by a bending or flanging process, and the first bending part 23 is the lead connection part. It may extend from one side of 21 to the surface of the support 20 with an inclined or curved surface. The second bending part 24 may extend from the other side of the lead connection part 21 to the surface of the support part 20 with an inclined surface or a curved surface.

Widths of the lead connection portions 21 of the respective bus bars 211 , 212 , 222 , and 214 may be the same as or different from each other. In addition, there is a problem that the electrode leads 131 and 141 of each of the battery cells 110 may be biased in one direction according to the stacking direction, and accordingly, the contact portions 131A and 141A of the electrode leads 131 and 141 are the electrode leads ( 131 and 141) may be extended larger than the width. Accordingly, the at least one bus bar 211 , 212 , 222 , and 214 having at least one inclined lead connection part may further space the adjacent electrode leads 131 and 141 apart. In addition, since one end of the lead connection part 21 on one side and the height of the other end of the lead connection part 21 on the other side are provided differently, the contact portions 131A and 141A of the adjacent electrode leads 131 and 141 can be spatially separated. The bus bars 211 , 212 , 222 , and 214 and the inclined lead connection part 21 may not overlap in the longitudinal direction of the battery cell 110 .

In the bus bars 211 , 212 , 222 , and 214 , the lead connection portion 21 may be bent and used as a cutting portion of the lead holes 25 and 25A. However, when the areas of the lead holes 25 and 25A are not removed through a cutting process or blanking and are used as the inclined lead connection part 21, the support part 20 and the lead connection part 21 overlap. structure, and this causes a problem in that the size of the bus bar increases.

In the embodiment, a battery electrode lead is minimized or prevented from extending to an adjacent area by a bus bar frame structure having an inclined lead connection, thereby causing a fire due to a short problem between adjacent electrode leads having different polarities. There is a technological effect that can solve the problem.

In addition, according to the embodiment, the electrode lead may be damaged due to the electrode lead being bent at 90 degrees due to the bus bar frame structure having the inclined lead connection part, so there is a technical effect of significantly improving reliability or durability.

In addition, according to the embodiment, there is a technical effect of improving electrical adhesion and battery characteristics by improving the contact area between the electrode lead and the bus bar by the bus bar frame structure having an inclined lead connection part.

5 and 6, the electrode leads 131 and 141 of the outermost battery cell 110 may be connected to the outermost lead connection portions 211A and 214A of the bus bars 211, 212, 222, and 214, and the outermost lead connection portion 211A, 214A) may be bent, and a lead hole 25A or an open hole may be disposed on the outside.

The outermost lead connection parts 211A and 214A may be bonded and bonded to the outer surface of the outermost lead connection parts 211A and 214A in a direction in which the electrode leads 131 and 141 inserted through the lead hole 25A extend. . The outermost lead connecting parts 211A and 214A may be provided without a separate bending part or may have bending parts on both sides.

As shown in FIGS. 7 and 8A , after the contact portion of the electrode leads 131 and 141 is drawn out to one side of the inclined lead connection portion 21, the contact portion of the electrode leads 131 and 141 is placed on the surface of the lead connection portion 21. Bend it and glue it. Subsequently, as shown in FIG. 8B, when the contact parts of the electrode leads 131 and 141 are disposed on the lead connection portion 21 of the bus bars 212, 213, and 222, the electrode leads of the battery cell 110 ( 131 and 141 and the lead connection part 21 of the bus bars 212 , 213 and 222 may be joined and electrically connected. In the case of the laser welding method, compared to other welding methods such as ultrasonic welding, the strength of the connection by welding is high and the welding reliability can be secured, and replacement of consumables such as a horn or anvil used in the ultrasonic welding method can reduce cost. In addition, by allowing the laser welding method to be used together with other methods such as ultrasonic welding, the degree of freedom in design and manufacturing processes for battery modules and battery packs can be increased due to the availability of various welding methods.

Since the electrode leads 131 and 141 of the battery cell 110 are bent at an angle of less than 90 degrees, more stable adhesion to the contact portions 131A and 141A can be provided and reliability deterioration of the welding portion can be prevented. .

As shown in FIG. 10 , one end of the lead connection part 21 of the bus bars 212 and 222 may be curved. Accordingly, it is possible to reduce a problem in which an area in contact with the bent portion of the electrode leads 131 and 141 is reduced by the vertical surfaces at one end R2 of the lead connection part 21 . Since one end R2 of the lead connection part 21 of the bus bars 212 and 222 is curved, it is possible to prevent the electrode leads 131 and 141 from being affected.

As shown in FIG. 11 , the other end of the inclined lead connection part 21 of the bus bars 212 and 222 may include a protrusion P1. The protrusion P1 may be provided long in the longitudinal direction of the lead connection part 21, or may be provided in one or a plurality. The protrusion P1 protrudes in a direction away from the battery cell 110, and the protrusion height may be in the range of 50% to 100% of the thickness of the lead connection parts 212 and 222, and the thickness of the electrode leads 131 and 141. It may be 80% or more of The protrusion P1 may block the other ends of the contact portions 131A and 141A of the electrode leads 131 and 141 from exceeding an area of the lead connection part 21 . The bus bars 212 and 222 having the protrusion P1 may be provided in an inclined structure or may be provided horizontally, that is, in a direction perpendicular to the longitudinal direction of the battery cell 110 . Such a protrusion P1 may be disposed on at least one lead connection part of any one bus bar or two or more bus bars.

As shown in FIG. 12, in the first bus bar member 210A, the lead connection parts 21 of one side bus bars 211 and 212 are inclined from the other end to one end, and the lead connection parts 21B of the other side bus bars 213 and 214 are at one end. It may be inclined in the direction of the other end. That is, the lead connection parts 21 of one side bus bars 211 and 212 may be inclined so that the other end is low and one end is disposed at a high position, and the lead connection part 21B of the other side bus bars 213 and 214 has one end low and the other end high. It can be inclined to be placed on. That is, the bus bars 211, 212, 213, and 214 may have lead connection portions 21 and 21B inclined toward the center. One ends of the lead connection portions 21 and 21B are portions from which contact portions of the electrode leads 131 and 141 to be bonded are drawn out, and the other ends may be opposite to the ends. As another example, one of the lead connecting parts 21 and 21B of the central bus bars 212 and 214 may be inclined from one end to the other end, and the other may be inclined from the other end to one end. That is, any one of the bus bars 211, 212, 213, and 214 may have lead connecting portions 21 inclined in opposite directions or lead connecting portions 21 and 21B inclined in the same direction or different directions.

As shown in (a) and (b) of FIG. 13 , electrode leads 131 and 141 of adjacent battery cells 110 may have coupling leads 131B and 141B coupled to each other, and the coupling leads 131B and 141B are As the contact portions 131A and 141A of the electrode leads 131 and 141 of the battery cell 110, they may be disposed on the lead connection part 21 of the bus bar. The coupling leads 131B and 141B may be bonded on the inclined lead connection part 21 and bonded to the lead connection part 21 by laser welding. The two electrode leads 131 and 141 coupled by the coupling leads 131B and 141B may have the same polarity. After combining the contact portions 131A and 141A of the two or more electrode leads 131 and 141 in this way, they are drawn out to the lead connection portion 21 of the bus bars 212 and 222 and contacted on the inclined lead connection portion 21. , the adhesive force and reliability of the adhesive force of the electrode leads 131 and 141 of the battery cell 110 can be improved. The coupling leads 131B and 141B may have contact portions 131A and 141A of two or three electrode leads 131 and 141 . Therefore, in the bus bars 212 and 222, a structure in which the coupling leads 131B and 141B of the electrode leads 131 and 141 are bonded to each lead connection portion 21 and the individual contact portions 131A and 141A of the electrode leads 131 and 141 are It may include all bonded structures. An inclined second angle R3 of the lead connecting portion 21 at which the coupling leads 131B and 141B are disposed is the first angle R1 based on an imaginary straight line extending in the longitudinal direction of the battery cell 110. ) can be smaller than That is, the inclined second angle R3 of the lead connection portion 21 in which two or more electrode leads 131 and 141 are contacted and bonded is the angle of the lead connection portion 21 in which one electrode lead 131 and 141 is contacted and bonded. It may be smaller than the first angle R1.

As shown in (a) of FIG. 14, one end of the lead connection part 21 exposed to the lead holes 25 and 25A may be disposed on the same straight line in the longitudinal direction, so that one side and the other side of the electrode leads 131 and 141 It can be bonded and bonded at the same height. As shown in (b) of FIG. 14 , one end of the lead connection portion 21C exposed to the lead holes 25 and 25A may be provided in a curved shape with a convex center. The curve may have a convex curve along the length direction of the lead connection portion 21C, one side and the other side of the electrode lead may have the same height, and the central portion may be bonded and bonded to a higher height. As shown in (c) of FIG. 14 , one end of the lead connection part 21D exposed to the lead holes 25 and 25A may be provided in a curved shape with a concave center. The curve may have a concave curve along the length direction of the lead connecting portion 21D, one side and the other side of the electrode lead may have the same height, and the central portion may be bonded and bonded at a height lower than the height of one side/the other side. This means that the electrode leads 131 and 141 of the battery cell 110 may have flexibility in the width direction. Accordingly, it can be adhered and bonded to the surface of the convex curve-shaped lead connection portion 21C or the concave curve-shaped lead connection portion 21D. In addition, the convex curve-shaped lead connection portion 21C or the concave curve-shaped lead connection portion 21D may be provided as an inclined surface having one end low and the other end high. One ends of the lead connecting portions 21, 21C, and 21D are portions from which contact portions of the electrode leads 131 and 141 to be bonded are drawn out, and may be the opposite side of the other ends. Two or more of the lead connecting parts 21, 21C, and 21D having different shapes may be mixed and disposed in the bus bar member.

An embodiment of the present invention may improve adhesion between an inclined bus bar and a lead of a battery cell.

In addition, embodiments of the present invention can prevent an open defect between an inclined bus bar and a lead of a battery cell, and can improve durability.

In addition, embodiments of the present invention can improve electrical reliability of the bus bar, the bus bar frame, and the battery module.

For example, in the embodiment, a battery electrode lead is minimized or prevented from being extended to an adjacent area by a bus bar frame structure having an inclined lead connection, resulting in a fire due to a short-circuit problem between adjacent lead electrodes having different polarities. has a technical effect that can solve problems that may arise.

In addition, according to the embodiment, the electrode lead may be damaged due to the electrode lead being bent at 90 degrees due to the bus bar frame structure having the inclined lead connection part, so there is a technical effect of significantly improving reliability or durability.

In addition, according to the embodiment, there is a technical effect of improving electrical adhesion and battery characteristics by improving the contact area between the electrode lead and the bus bar by the bus bar frame structure having an inclined lead connection part.

As shown in FIG. 15 , the battery pack 1200 having a plurality of battery modules may be provided in the vehicle 1300 as a fuel source of the vehicle 1300 . By way of example, the battery pack 1200 may be included in the vehicle 1300 in an electric vehicle, a hybrid vehicle, and any other method that may utilize the battery pack 1200 as a fuel source.

Preferably, the vehicle 1300 may be an electric vehicle. The battery pack 1200 may be used as an electric energy source for driving the vehicle 1300 by providing driving force to the motor 1310 of the electric vehicle. In this case, the battery pack 1200 has a high nominal voltage of 100V or more. For hybrid vehicles, it is set to 270V. The battery pack 1200 may be charged or discharged by the inverter 1320 according to driving of the motor 1310 and/or the internal combustion engine. The battery pack 1200 may be charged by a regenerative charging device coupled with a break. The battery pack 1200 may be electrically connected to the motor 1310 of the vehicle 1300 through the inverter 1320 . As described above, the battery pack 1200 also includes a BMS. The BMS estimates states of battery cells in the battery pack 1200 and manages the battery pack 1200 using the estimated state information. For example, state information of the battery pack 1200 such as state of charge (SOC), state of health (SOH), maximum allowable input/output power, and output voltage of the battery pack 1200 is estimated and managed. In addition, charging or discharging of the battery pack 1200 is controlled using this state information, and a replacement time of the battery pack 1200 can be estimated.

The ECU 1330 is an electronic control device that controls the state of the vehicle 1300 . For example, torque information is determined based on information such as accelerator, brake, and speed, and the output of the motor 1310 is controlled to match the torque information. In addition, the ECU 1330 sends a control signal to the inverter 1320 to charge or discharge the battery pack 1200 based on state information such as SOC and SOH of the battery pack 1200 transmitted by the BMS. The inverter 1320 causes the battery pack 1200 to be charged or discharged based on a control signal from the ECU 1330 . The motor 1310 drives the vehicle 1300 based on control information (eg, torque information) transmitted from the ECU 1330 using electric energy of the battery pack 1200 .

The vehicle 1300 includes the battery pack 1200 according to the present invention, and the battery pack 1200 includes the battery module 1000 with improved safety as described above. Accordingly, the stability of the battery pack 1200 is improved, and since the battery pack 1200 has excellent stability and can be used for a long time, the vehicle 1300 including the battery pack 1200 is safe and easy to operate.

In addition, it goes without saying that the battery pack 1200 may also be provided in other devices, instruments, and facilities, such as an ESS BMS using a secondary battery, in addition to the vehicle 1300 . As such, devices, instruments, and facilities having the battery pack 1200, such as the battery pack 1200 and the automobile 1300 according to the present embodiment, include the battery module 1000 described above, and thus the battery module described above. A battery pack 1200 having all of the advantages of 100 and a device such as a vehicle 1300 including the battery pack 1200, equipment, and facilities may be implemented.

A battery module according to an embodiment of the present invention may be applied to vehicles such as electric vehicles or hybrid vehicles. That is, a vehicle according to an embodiment of the present invention may include the battery module according to an embodiment of the present invention described above.

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described. On the other hand, although terms indicating directions such as up, down, left, and right are used in this specification, these terms are only for convenience of description and may vary depending on the location of the target object or the location of the observer of the present invention. is obvious to those skilled in the art.

100: cell array 110: battery cell
130: case 131, 141: electrode lead
210,220: Bus bar frame 210A, 220A: Bus bar member
211,212,213,214,222: bus bar 230: top frame
400: sensing unit 410: substrate member
20: support part 21: lead connection part
23,24: bending part 25,25A: lead hole

Claims (7)

A first bus bar frame having a plurality of bus bars electrically connected to one electrode lead of a battery cell; and
A second bus bar frame disposed on the other side of the battery cell and having a plurality of bus bars to which the electrode lead of the other side of the battery cell is bonded and electrically connected,
At least one bus bar of the first and second bus bar frames is disposed on at least one lead hole through which an electrode lead of the battery cell is drawn, and one side or the other side of the lead hole, and an end of the electrode lead of the battery cell At least one lead connection portion drawn out from the lead hole and brought into contact with it;
The lead connection parts of the first and second bus bar frames are inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell,
The inclined lead connection part is formed by extending obliquely from the inner contact part and the inner contact part where the end of the electrode lead of the battery cell is drawn out from the lead hole to start contact, and contacts the end of the electrode lead of the battery cell. Including the outermost contact that ends,
The outermost contact portion of the inclined lead connection portion is disposed higher than the inner contact portion of the lead connection portion inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell. According to claim 1,
One end of the lead connection portion has a concave curve or a convex curve shape along the longitudinal direction of the lead hole. According to claim 1,
One side and the other side of the lead connection portion are connected to the support portion of the bus bar and have first and second bent portions, the bus bar frame. According to claim 1,
A bus bar frame having a protrusion protruding in a direction farther from the battery cell at the other end of the lead connection part. a cell array in which battery cells having electrode leads on both sides of each are stacked;
a first bus bar frame disposed on one side of the cell array and having a plurality of bus bars electrically connected to one side electrode leads of the battery cells; and
A second bus bar frame disposed on the other side of the cell array and having a plurality of bus bars to which the other side electrode leads of the battery cells are bonded and electrically connected,
At least one bus bar of the first and second bus bar frames is disposed on at least one lead hole through which the electrode lead is drawn, and one side or the other side of the lead hole, and is drawn out from the lead hole to form an end of the electrode lead. Including at least one lead connection to be in contact,
The lead connection portion is inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell,
The inclined lead connection part is formed by extending obliquely from the inner contact part and the inner contact part where the end of the electrode lead of the battery cell is drawn out from the lead hole to start contact, and contacts the end of the electrode lead of the battery cell. Including the outermost contact that ends,
The battery module, wherein the inclined outermost contact portion of the lead connection portion is disposed higher than the inner contact portion of the lead connection portion inclined with respect to an imaginary straight line extending in the longitudinal direction of the battery cell. According to claim 5,
One end of the lead connection portion has a concave or convex curve shape along the length of the lead hole. According to claim 5,
Wherein the lead connection part is disposed a coupling lead in which two or more electrode leads of the battery cells are coupled.

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