KR20200062139A - Battery module - Google Patents

Abstract

According to an embodiment of the present invention, provided is a battery module which can reduce the number of assembly processes. The battery module comprises: a plurality of battery cells individually including an electrode tap; and a busbar coming in contact with the electrode tap to electrically connect the plurality of battery cells to each other. The busbar includes a plate having a plurality of holes formed thereon. The plurality of battery cells are electrically connected to each other by inserting the electrode taps into at least some of the plurality of holes.

Description

Battery module {BATTERY MODULE}

Embodiments of the present invention relate to a battery module.

Secondary batteries that can be charged and discharged are being actively researched through the development of high-tech fields such as digital cameras, cell phones, notebooks, and hybrid vehicles. Examples of the secondary battery include a nickel-cadmium battery, a nickel-metal hydride battery, a nickel-hydrogen battery, and a lithium secondary battery. Among them, the lithium secondary battery has a working voltage of 3.6 V or higher and is used as a power source for portable electronic devices, or is used in a high-power hybrid vehicle by connecting a plurality of them in series. For a nickel-cadmium battery or a nickel-metal hydride battery Compared to this, the operating voltage is three times higher, and the energy density per unit weight is also excellent, and thus it is rapidly used.

The bus bar is brought into contact with the electrode tab to connect a plurality of battery cells. Conventional bus bars are formed by the'U' shape. Two or more battery cells may be electrically connected by contacting the electrode tab to the'U' shaped busbar. In order to electrically connect the battery cells, at least one process of cutting and bending an electrode tab must be performed. As the number of battery cells to be connected, such as 3p or 4p (three-cell parallel connection or four-cell parallel connection) is changed, the cutting and bending operation dimensions of the electrode tabs are different. Since the electrode tabs have to be deformed, the number of process operations increases, which increases the cost and complicates the process.

Korean Patent Publication No. 10-2015-0110078 (2015.10.02)

Embodiments of the present invention, to simplify the electrode tap treatment process for electrically connecting a plurality of battery cells, to provide a battery module that can reduce the number of assembly processes.

In addition, it is to provide a battery module that can not change the shape of the electrode tab through the shape deformation of the bus bar.

In addition, it is to provide a battery module that can reduce the cost as the number of processes is reduced.

In addition, it is to provide a battery module that can uniformly melt the electrode tab when the electrical connection between a plurality of battery cells.

In addition, to provide a battery module that can visually check the connection state when the electrical connection between a plurality of battery cells by welding or the like.

A battery module according to the spirit of the present invention includes a plurality of battery cells including electrode tabs; A bus bar having a plate on which a plurality of holes are formed, and electrically connecting the electrode tabs of the plurality of battery cells; including, wherein the electrode tabs are formed to be bent; And a straight portion extending from the bending portion and fixedly coupled to the bus bar, which is inserted into the plurality of holes and joined to the inserted plurality of holes.

The bending part may be disposed between a portion where the electrode tab is withdrawn from the battery cell and the bus bar.

The bending part may contact the bus bar.

It may include; a support plate disposed between the bus bar and the battery cells.

The bending portion may be configured to contact the support plate.

The support plate may include a plurality of support holes corresponding to the plurality of holes, and the contact of the bending part may be made on an outer peripheral surface of the plurality of support holes.

As a fixed plate disposed on the outside of the bus bar, a fixed plate coupled to the support plate with the bus bar therebetween; further comprising, the support plate and the fixed plate, respectively, the plurality of holes corresponding to the plurality of holes The support hole, and a plurality of exposed holes; may include, the plurality of support holes, and the plurality of exposed holes, may be configured to not interfere with the plurality of holes.

The fixed plate may be configured to cover the bus bar to prevent exposure of the bus bar.

The plurality of battery cells includes an electrode assembly to which the electrode tab is connected, and an exterior material configured to surround at least a portion of the electrode assembly and the electrode tab, and the electrode tabs are configured to be covered by the exterior material. Terrace part; An insulating portion extending from the terrace portion and wrapped with an insulating material; It may include; electrode tab portion extending from the insulating portion.

The bending portion may be formed on the insulating portion, and the straight portion may be configured to be formed on the electrode tab portion.

The electrode tab portion may include a chamfer portion configured to be narrowed toward an end portion so that insertion of the electrode tabs into the plurality of holes is guided.

The plate may include a protrusion formed around a location where the plurality of holes are formed.

The cross-section around the plurality of holes may be formed to taper to one side of the plate so that the insertion of the electrode tabs into the plurality of holes is induced.

A battery module manufacturing method according to the spirit of the present invention comprises the steps of: providing a plurality of stacked battery cells having a bending portion and an electrode tab formed with a straight portion extending from the bending portion; Providing a bus bar having a plurality of holes formed plate; Inserting the straight portions of the electrode tabs into the plurality of holes; And bonding the electrode tabs to the plate in the plurality of holes inserted therein.

The step of providing the plurality of battery cells may include forming the bending portion at a predetermined portion of the electrode tab.

The predetermined portion may be disposed between the portion where the electrode tab is withdrawn from the battery cell and the bus bar.

The bonding may be performed by laser welding.

The bonding may be performed by wobble welding.

The wobble welding may be performed along the longitudinal axis of the end faces of the first and second electrode tabs.

According to an embodiment of the present invention, it is possible to provide a battery module capable of reducing the number of assembly processes by simplifying a process of processing an electrode tab for electrically connecting a plurality of battery cells.

In addition, it is possible to provide a battery module capable of not deforming the shape of the electrode tab through shape deformation of the bus bar.

In addition, it is possible to provide a battery module that can reduce costs as the number of processes is reduced.

In addition, the electrode tab may be uniformly melted when electrically connecting a plurality of battery cells.

In addition, when the electrical connection between a plurality of battery cells by welding or the like, the connection state can be visually confirmed.

1 is a view showing a secondary battery according to an embodiment of the present invention
Figure 2 is a view showing that the bus bar is in contact with the secondary battery according to an embodiment of the present invention
3 is a view showing a bus bar according to an embodiment of the present invention
Figure 4a is a view showing a cross-section of a bus bar according to an embodiment of the present invention
Figure 4b is a cross-sectional view showing that the electrode tab is inserted into the hole of the bus bar according to an embodiment of the present invention
Figure 5a is a view showing a cross-section of a bus bar according to an embodiment of the present invention
Figure 5b is a cross-sectional view showing that the electrode tab is inserted into the hole of the bus bar according to another embodiment of the present invention
6 is a view showing a state in which a bending portion is formed in the insulating portion of the electrode tab
7A is a view showing a secondary battery according to another embodiment of the present invention
Figure 7b is an enlarged view of part A of Figure 7a
8 is an exploded perspective view of a support plate, a bus bar and a fixing plate according to another embodiment of the present invention
9 is a view showing a state in which the support plate, bus bar and fixing plate of FIG. 8 are combined;
FIG. 10 is a sectional view taken along line A-A' in FIG. 9;
Figure 11a is a view showing the electrical connection state of the battery module according to another embodiment of the present invention from the front
Figure 11b is a view showing the electrical connection state of the battery module from the rear according to another embodiment of the present invention
12A is a view showing a cross section of a bus bar according to another embodiment of the present invention
12B is a cross-sectional view of an electrode tab inserted into a hole in a bus bar according to another embodiment of the present invention
13 is a view showing a bus bar according to another embodiment of the present invention
14A is a view showing a cross section of a bus bar according to another embodiment of the present invention
14B is a cross-sectional view showing an electrode tab inserted into a hole of a bus bar according to another embodiment of the present invention
15 is a cross-sectional view showing a position where laser welding is performed on the protruding electrode tab according to another embodiment of the present invention.
16 (a) and (b) are views showing a state in which laser welding is performed on an electrode tab according to another embodiment of the present invention.
17(a) and (b) are views showing a state in which a laser is irradiated while forming an angle with respect to a longitudinal direction of an electrode tab according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is only an example and the present invention is not limited thereto.

In describing the present invention, when it is determined that a detailed description of known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following examples are merely a means for effectively explaining the technical spirit of the present invention to a person having ordinary knowledge in the technical field to which the present invention pertains.

1 is a view showing a secondary battery 10 according to an embodiment of the present invention, Figure 2 is a view showing a bus bar 20a is disposed on the secondary battery 10 according to an embodiment of the present invention .

1 to 2, the secondary battery 10 may be formed of a battery cell 11 and an electrode tab 12 drawn out of the battery cell 11.

The bus bar 20a according to an embodiment of the present invention has a shape in which a hole 23a is formed in the plate 21a. A plurality of holes 23a are formed in the plate 21a, and the electrode tabs 12 are welded to each hole 23a to electrically connect the plurality of welded battery cells 11. The electrode tab 12 is inserted into the hole 23a and welded to connect the battery cells 11, and the shape of the electrode tab 12 need not be modified. A plurality of holes 23a may be formed in the plate 21a to correspond to the number of battery cells 11 to be connected. Therefore, in order to electrically connect the battery cells 11, regardless of the number of battery cells 11 to be connected, the battery cells 11 can be electrically connected without changing the shape of the electrode tab 12. . Details of the plate 21a and the hole 23a will be described later.

3 is a view showing a bus bar 20a according to an embodiment of the present invention.

3A and 3B, the bus bar 20a may include a plate 21a, a protrusion 22a, and a hole 23a. The bus bar 20a includes a plurality of holes 23a formed at predetermined intervals on the plate 21a, and welds the electrode tabs 12 inserted into the holes 23a to provide a plurality of battery cells 11 ) Can be electrically connected. By inserting and welding the electrode tab 12 for each hole 23a, the electrode tab 12 can be welded to the plate 21a. Therefore, the plurality of welded battery cells 11 can be electrically connected. At this time, the hole 23a may be formed in a slit shape.

Corresponding to the number of the battery cells 11 welded to the plate 21a, the area or size of the plate 21a may be determined. For example, when two battery cells 11 are electrically connected, an area or size in which holes 23a in which electrode tabs 12 of two battery cells 11 can be welded can be formed can be formed. Can be formed. Similarly, when three battery cells 11 are electrically connected, the electrode tab 12 of the three stacked battery cells 11 may be formed in an area or size in which holes 23a to be welded may be formed. Can be. The area or size of the plate 21a may be determined according to the number of battery cells 11 to be connected, such as two, three, or four. The bus bar 20a according to an embodiment of the present invention changes the area or size of the plate 21a or changes the number of holes 23a formed in the plate 21a to electrically connect the battery cell 11. Since the connection is made, the shape of the electrode tab 12 may not be changed.

In addition, the bus bar 20a according to an embodiment of the present invention changes the size of the area of the plate 21a or the like or changes the number of holes 23a formed in the plate 21a to change the battery cell 11. Since it is electrically connected, the shape of the electrode tab 12 may not be changed. Specifically, in the conventional case, in order to weld the plurality of electrode tabs 12, an additional process is required to be able to make contact with each other, such as bending the electrode tabs 12 or deforming the shape. However, when using the bus bar 20a according to an embodiment of the present invention, it is only necessary to go through the process of connecting the electrodes after inserting the electrode tab 12 into the bus bar 20a, and the separate electrode tab 12 described above. No transformation is necessary.

The bus bar 20a according to an embodiment of the present invention may be formed with a protrusion 22a. The protrusion 22a may be formed at a position where the hole 23a is formed in the plate 21a. The protrusion 22a may be formed to guide the electrode tab 12 into the hole 23a. The enlarged view shown in FIG. 3B shows that the hole 23a is formed in the protrusion 22a. Since the hole 23a is formed to correspond to the thickness T ₁ and the length L ₁ of the electrode tab 12, the hole 23a is plated with an area as narrow as the thickness T ₁ of the electrode tab 12. It may be formed on (21a). Accordingly, a protrusion 22a may be formed to guide the electrode tab 12 into the hole 23a more easily. A detailed description thereof will be described later with reference to FIG. 5.

A plurality of holes 23a may be formed on the plate 21a at predetermined intervals. The predetermined interval may be determined according to the interval of the battery cells 11. Specifically, the predetermined interval may be determined according to the position where the electrode tab 12 is inserted into the hole 23a. The number of holes 23a may be determined according to the number of battery cells 11 to be electrically connected.

Further, the hole 23a may be formed with a depth (shown in FIG. 4) and a width L ₂ corresponding to the electrode tab 12. Specifically, the hole 23a may be formed to a depth L ₆ capable of maintaining the state of the inserted electrode tab 12 before welding. Therefore, the electrode tab 12 may be inserted into the hole 23a, and contact the plate 21a.

The electrode tab 12 is inserted into the hole 23a and welded in contact with the plate 21a, so that the electrode tab 12 can be welded to the plate 21a. Therefore, a plurality of battery cells 11 welded to the bus bar 20a can be electrically connected.

4 is a view showing a bus bar 20a according to an embodiment of the present invention. Figure 4a is a view showing a cross-section of a bus bar 20a according to an embodiment of the present invention, Figure 4b is an electrode tab 12 in the hole 23a of the bus bar 20a according to an embodiment of the present invention It is the figure which showed the inserted thing in cross section.

4A and 4B, holes 23a may be formed at predetermined intervals of the plate 21a. The electrode tab 12 may be inserted into the hole 23a. The hole 23a is formed to correspond to the thickness T ₁ and the length L ₁ of the electrode tab 12, so that the electrode tab 12 inserted into the hole 23a can be in contact with the plate 21a. . Referring to FIG. 4, three holes 23a may be formed on the plate 21a constituting one bus bar 20a. The three battery cells 11 welded through the holes 23a may be electrically connected.

A protrusion 22a may be formed in a portion where the hole 23a is formed. However, the protrusion 22a is not limited to being formed, and the protrusion 22a may not be formed. In this case, holes 23a may be formed in the straight plate 21a.

Further, one side of the plate 21a may be formed to decrease as the width L ₄ of the entry space into which the electrode tab 12 enters from one side of the plate 21a approaches the hole 23a. As the width (L ₄ ) of the side where the electrode tab 12 enters is reduced as it approaches the hole 23a, one side of the plate 21a is inclined, and the electrode tab 12 has the hole 23a in the shape as above. Can be easily inserted into.

5 is a view showing a bus bar 20a according to an embodiment of the present invention. Figure 5a is a view showing a cross-section of a bus bar 20a according to an embodiment of the present invention, Figure 5b is an electrode tab 12 in the hole 23a of the bus bar 20a according to another embodiment of the present invention It is the figure which showed the inserted thing in cross section.

5A and 5B, the electrode tab 12 may include a bending part 121. The bending part 121 may be formed by bending a predetermined portion of the electrode tab 12, and at this time, the bending part 121 may be bent in a U shape. However, the bending part 121 is not limited to being formed by bending a predetermined part of the electrode tab 12, and a protruding part may be formed at a predetermined part of the electrode tab 12, and other bending parts It may include that 121 can be formed. The bending part 121 absorbs a shock when an external vibration or shock occurs in a state in which the electrode tab 12 is coupled to the bus bar 20a through welding, and thus is applied between the electrode tab 12 and the bus bar 20a. It is possible to minimize damage to the bonding state or damage to the electrode tab 12 itself.

Furthermore, when the electrode tab 12 is inserted into the bus bar 20a, the bus bar 20a may be seated and fixed to the bending portion 121 of the electrode tab 12, and the electrode tab in an inserted state as described below 12, the gap between the bus bar 20a and the hole 23a (shown in FIG. 15) is kept constant, and the position of the electrode tab 12 inserted into the hole 23a is fixed, and then the electrode tab 12 ) When welding, the welding line can be easily traced. In addition, the bending portion 121 is in close contact with one side of the plate 21a to prevent the laser L from being directly irradiated to the battery cell 11 in the welding process.

On the other hand, the position of the bending portion 121 is not limited to this, as shown in Figure 10 to be described later, may be located spaced a predetermined distance from the hole (23a). That is, it may be located in contact with one side of the outer circumferential surface of the support hole 32 of the support plate 30 in a state spaced from the hole 23a. Details of this will be described later.

Meanwhile, at least one of the electrode tabs 12 may include a bending portion 121 and a straight portion, and at least a portion of the straight portion may be inserted into the hole 23a. At this time, the straight portion may mean a portion not bent in the electrode tab 12. However, the above-described straight portion may have fine bends depending on the process, but the straight portion may mean a straight portion that is not separately bent in the electrode tab 12.

Meanwhile, the predetermined portion may be between a portion inserted into the hole 23a and a portion where the electrode tab 12 is withdrawn from the battery cell 11. As described above, when the electrode tab 12 is inserted into the hole 23a, the bending part 121 formed at a predetermined portion of the electrode tab 12 is not bent outside the bending part 121 of the electrode tab 12. It is possible to limit the length (L ₇ ) of the non-part.

The electrode tab 12 may be inserted and fixed into the hole 23a by the bending part 121. Depending on the position where the bending part 121 is formed on the electrode tab 12, the length L ₇ of the unbent part of the electrode tab 12 outside the bending part 121 is adjusted through the bending part 121. Can be. Looking at the process of inserting the electrode tab 12 into the hole 23a, the electrode tab 12 is inserted into the hole 23a, and the bending portion 121 formed on the electrode tab 12 contacts the plate 21a. It can take. Therefore, the electrode tab 12 can be fixed by being inserted into the hole 23a right up to the position where the bending part 121 is formed. Meanwhile, the length L ₇ of the non-bent portion of the electrode tab 12 outside the bending part 121 may be formed to be longer than the depth L ₆ of the hole 23a.

In the bus bar 20a according to an embodiment of the present invention, a hole is formed so that welding between the hole 23a formed in the bus bar 20a and the electrode tab 12 inserted in the hole 23a is made firmly The gap L ₃ between the 23a and the electrode tab 12 (any one of the gaps on both sides of the electrode tab 12 inserted into the hole 23a) may be equal to or less than a predetermined value, and the predetermined value is 0.2 mm. Can be. If the gap L ₃ between the hole 23a and the electrode tab exceeds 0.2 mm, it may be difficult to securely connect the hole 23a and the electrode tab 12 by laser welding. More preferably, the gap L ₃ between the hole 23a and the electrode tab 12 may be 0.1 mm or less. For example, when the width L ₂ of the hole 23a formed in the bus bar 20a is 0.5 mm, the thickness T ₁ of the electrode tab 12 is 0.3 mm or more, thereby making the electrode tab 12 ), the gaps L _{3 on} both sides between the holes 23a formed on both sides of the electrode tab 12 and the electrode tabs 12 may be 0.1 mm ((0.5-0.3)/2) or less, respectively.

More preferably, in the welding process, the bus bar 20a may also be melted, and when there is no difference in the thickness T ₁ of the electrode tab 12 and the size of the hole 23a, the electrode tab 12 is inserted in the process. Since there may be problems in the process such as not being smoothly inserted, the gaps L _{3 on} both sides between the holes 23a and the inserted electrode tabs 12 should be about 0.05 mm (0.1/2) or more, respectively. That is, the sum of both gaps L ₃ between the hole 23a and the electrode tab 12 inserted in the hole 23a may be 0.1 mm to 0.2 mm.

Through this, only the electrode tab 12 may be melted during laser welding in the process of manufacturing the battery module 1 to be described later.

Meanwhile, the electrode tab 12 may be made of any one of copper (Cu) and aluminum (Al). For example, when the positive electrode tab is made of copper (Cu), the negative electrode tab may be made of aluminum (Al), and vice versa. At this time, the thickness of the positive electrode and the negative electrode tab (T ₁ ) may also vary, the thickness (T ₁ ) when the electrode tab is made of copper (Cu) due to the characteristics of the positive and negative electrode tabs is about 0.3 mm, aluminum (Al) In the case of consisting of the thickness (T ₁ ) It will be desirable to be about 0.4mm, and accordingly, the width (L ₂ ) of the hole (23a) of the bus bar 20a may be formed to be approximately 0.5mm. However, it is apparent that the thickness T ₁ of the electrode tab 12 and the width L ₂ of the hole 23a are not limited thereto, and may be changed as necessary.

6 is a view showing a state in which the bending portion 121 is formed on the insulating portion 125 of the electrode tab 12.

Referring to FIG. 6, the battery cell 11 may include an electrode assembly and an exterior material surrounding the electrode assembly. At this time. The electrode tab 12 is a position where the electrode tab 12 is drawn out of the terrace portion 124 and the terrace portion 124 formed by joining the exterior material along the side outer surface where the electrode tab 12 protrudes from the electrode assembly. Including the insulating portion 125 to increase the sealing degree of the exterior material and at the same time to ensure the electrical insulation state and the electrode tab portion 126 withdrawn from the insulating portion 125, at least a portion is inserted into the hole (23a) The bending part 121 may be formed on the insulating part 125.

Specifically, the bending portion 121 may be formed by bending the electrode tab portion 126 outside the insulating portion 125, but is not limited thereto, and is insulated by bending the insulating portion 125 of the electrode tab 12. A bending portion 121 may be formed in the portion 125. As described above, as the bending part 121 is formed on the insulating part 125, the length L ₁ of the entire electrode tab 12 may be reduced, and accordingly, the volume of the entire battery module 1 may also be reduced. have.

Furthermore, when the bending portion 121 is formed on the insulating portion 125, bending may be performed within a range in which the insulating portion 125 is not torn or damaged, and the insulating performance of the insulating portion 125 is While maintaining, the volume occupied by the electrode tab 12 in the battery module 1 may be reduced, and further, the energy density of the battery module 1 may be increased.

7(a) is a view showing a secondary battery 10 according to another embodiment of the present invention, and FIG. 7(b) is an enlarged view of part A of FIG. 7(a).

On the other hand, referring to Figure 7 (a) and (b), both ends of the electrode tab 12, the chamfer (chamfer) portion 127 is formed between the electrode tab 12 hole (23a) inter-insert electrode tab (12) Insertion can be facilitated.

Specifically, among the electrode tabs 12, the length (L ₅ ) direction (d ₂ ) of the end surface of the electrode tab 12 is opposite (edge), and the length (L ₁ ) direction (d ₁ ) of the electrode tab 12 It may be formed to be cut inclined with respect to, the chamfer portion 127 may be formed on both ends of the electrode tab 12. As described above, the chamfer portion 127 is formed at the end of the electrode tab 12 so that the insertion of the electrode tab 12 into the hole 23a may be induced in the hole 23a insertion process, and the electrode tab 12 is inserted. This can be easier.

8 is an exploded perspective view of a support plate 30, a bus bar 20a, and a fixed plate 40 according to another embodiment of the present invention, and FIG. 9 is a support plate 30 of FIG. 8 and a bus The bar 20a and the fixed plate 40 are combined views, and FIG. 10 is a view showing a cross section A-A' in FIG. 9.

At this time, the FIG. 9 shows a state in which a plurality of secondary batteries 10 are not connected to the support plate 30, the bus bar 20a, and the fixed plate 40 combination, and FIG. 10 shows the support plate ( 30), a view showing a state in which the electrode tab 12 is inserted from one side of the bus bar 20a and the fixed plate 40 assembly.

8 to 10, the battery module 1 according to another embodiment of the present invention is a support plate 30 formed with a plurality of support holes 32 corresponding to the holes 23a of the bus bar 20a ) May be further included. At this time, the support plate 30 is positioned between the plurality of battery cells 11 and the bus bar 20a to fixably support the bus bar 20a.

Specifically, the support plate 30 is a plate-shaped support plate body 31 and a plurality of support holes 32 formed corresponding to a plurality of holes 23a of the bus bar 20a on the support plate body 31 ). At this time, the size of the support hole 32 may be formed to have a larger cross-section than the size of the bus bar hole 23a, and the bending portion 121 of the electrode tab 12 contacts one side of the outer circumferential surface of the support hole 32 Can be supported. At this time, the bending portion 121 may be formed on the insulating portion 125 of the electrode tab 12 as described above.

Through this, in the welding process to be described later, the gap L ₃ between the electrode tab 12 and the busbar hole 23a is kept constant, and the position of the electrode tab 12 inserted into the hole 23a is fixed, followed by When welding the electrode tab 12, the welding line can be easily tracked. In addition, as the bending part 121 is in close contact with one side of the outer circumferential surface of the support hole 32, it is possible to prevent the laser L from being directly irradiated to the battery cell 11 in the welding process.

On the other hand, the support plate may be coated with an insulating material on the outer surface or formed of an insulating material, and each of the plurality of electrode tabs is fixed in a state inserted into each of the plurality of support holes, thereby maintaining the insulation state between the electrode tabs. have.

Furthermore, the battery module 1 according to another embodiment of the present invention may further include a fixing plate 40 for fixing and supporting the bus bar 20a and the supporting plate 30.

Specifically, the battery module 1 according to another embodiment of the present invention further includes a fixing plate 40 in which a plurality of busbar exposure holes 42 corresponding to holes 23a of the busbar 20a are formed. can do. At this time, the fixing plate 40 is located on the outside of the bus bar 20a, and can be fixedly supported on the bus bar 20a by being coupled to at least a portion of the support plate 30 at least in part. In addition, the fixing plate 40 can be positioned in a shape that covers the outer surface of the bus bar 20a, and can protect the bus bar 20a from foreign objects.

More specifically, the fixed plate 40 is exposed to a plurality of bus bars formed to correspond to a plurality of holes 23a of the bus bar 20a on the plate-shaped fixed plate body 41 and the fixed plate body 41. It may include a hole (42). At this time, the size of the bus bar exposed hole 42 may be formed to have a larger cross-section than the size of the bus bar hole 23a, and preferably, the protrusion 22a may be formed to a size exposed to the outside. It is possible to facilitate tracking of welds between welds.

Further, the fixed plate 40 may be formed in a form that wraps the outer surface of the plate 21a of the bus bar 20a except for the bus bar exposure hole 42, and the support plate 30 and the bus bar 20a. ) Can be stably fixed by supporting the bus bar 20a by being interposed therebetween.

Meanwhile, two or more secondary batteries 10 may be connected in parallel through the bus bar 20a to be clustered into one parallel aggregate (shown in FIG. 11), and the parallel aggregate 100 may be provided with a plurality of mutually By connecting in series, the battery module 1 can be formed. At this time, two or more of the bar 20a may be provided. Among the two or more bus bars 20a, at least a portion of each of the bus bars 20a located at both ends of one side of the battery module 1 is external. A terminal unit 25a that may be connected to another battery module or a charging/discharging device may be formed.

Specifically, each of the terminal portions 25a may mean a (+) pole and a (-) pole of the entire battery module 1 to which a plurality of parallel assemblies 100 are connected, and an electrode of the plurality of parallel assemblies 100 Depending on the arrangement, one of the two terminal portions 25a may be connected to the (+) pole, and the other one may be connected to the (-) pole.

Meanwhile, a terminal support hole 44 may be formed at a position corresponding to the terminal part 25a on at least a part of both ends of the fixing plate 40, and the terminal part 25a may be provided in the terminal support hole 44. It can be inserted and fixed.

For example, as illustrated in FIG. 8, two bus bars 20a each including three holes 23a may be provided, and are located at both ends at one side of the battery module 1. A terminal portion 25a may be formed on at least a portion of each of the two bus bars 20a. Furthermore, as illustrated in FIG. 9, the terminal portion 25a is inserted into the terminal support hole 44 formed on the fixing plate 40 so that the position of the bus bar 20a can be fixed and supported.

Furthermore, the terminal portion 25a is exposed to the outside of the fixed plate 40 even when the bar protruding outside the fixed plate 40 and the bus bar 20a is wrapped in the fixed plate 40. It can be connected to an external battery module or a charging/discharging device.

Meanwhile, as described above, when a plurality of bus bars 20a are provided, at least a part of the fixing plate 40 is positioned between the plurality of bus bars 20a to fix and support the position of the bus bars 20a. At least one fixing member 43 that can be formed. At this time, the at least one fixing member 43 may be formed to protrude toward the bus bar 20a from at least a portion of the fixing plate body 41, and may be formed corresponding to the number of bus bars 20a. For example, as shown in FIG. 8, when two bus bars 20a are provided, one fixing member 43 may be formed on one side of the fixing plate 40, and the fixing member 43 ) Is located between the two bus bars 20a to fix and support the position of the bus bars 20a.

Furthermore, a fixing member insertion groove 33 corresponding to the fixing member 43 may be embedded in at least a portion of the support plate 30 on the bus bar 20a side. Specifically, the fixing member 43 protruding from the fixing plate 40 can be inserted into one side of the support plate 30, and the fixing member 43 is located in the fixing member insertion groove 33, so that the bus The bar 20a can be fixed and supported more firmly.

Furthermore, the fixed plate 40 may include a plurality of fastening protrusions 411 formed at least partially of the fixed plate body 41 protruding toward the bus bar 20a, and the fastening protrusions 411 support plates 30 ) By being combined with at least a portion of the support plate 30 and the fixed plate 40 may be bound to each other.

Specifically, a locking portion (not shown) is formed in the fastening protrusion 411, and a locking groove (not shown) corresponding to the locking portion is formed on at least a part of the support plate 30, so that the locking portion and the locking portion are formed. Through the fastening of the groove, the fixed plate 40 and the support plate 30 can be coupled and coupled to each other with the bus bar 20a interposed therebetween. However, this is exemplary and is not limited thereto, and a method in which the fastening protrusion 411 can be fastened and coupled to at least a portion of the support plate 30 is sufficient.

As described above, the fixed plate 40 may be formed in a form surrounding all of the rest of the bus bar 20a except for the protruding portion 22a, and as it is formed of an insulating material such as plastic, the battery module 1 When used, the possibility of electrical connection with other components around the bus bar 20a may be blocked in advance.

Meanwhile, at least one insertion protrusion 45 protruding toward the bus bar 20a may be formed on a side surface of the fixed plate body 41 on the side of the bus bar 20a. At this time, the bus bar 20a is formed at a position corresponding to the position of the insertion protrusion 45 on the plate 21a and further includes at least one through hole 26a penetrated by the insertion protrusion 45. You can. In addition, the support plate 30 is formed on the support plate body 31 so that the insertion protrusion 45 can be inserted and can be combined with the insertion protrusion 45 in the insertion state of the insertion protrusion 45. At least one fastening hole 34 may be further included.

Specifically, the insertion protrusion 45, the through hole 26a and the fastening hole 34 are formed at positions corresponding to each other in the fixed plate body 41, the plate 21a and the support plate body 31, respectively. Can be. For example, the insertion protrusion 45 may be formed at an adjacent position of the busbar exposure hole 42, and correspondingly, the through hole 26a is located at an adjacent position of the hole 23a, and the fastening hole 34 may be formed at an adjacent position of the support hole 32.

More specifically, as shown in FIG. 9, when the fixing plate 40, the bus bar 20a and the support plate 30 are coupled, the insertion protrusion 45 has a through hole ( 26a) may be inserted into the fastening hole 34 of the support plate 30. At this time, each of the insertion protrusion 45 and the fastening hole 34 inserted into the fastening hole 34 may be coupled to each other so that the support plate 30 and the fixed plate 40 can be combined, and the bus bar 20a ) Can be fixed.

In addition, as the insertion projection 45 is inserted into the fastening hole 34 through the through-hole 26a, the insertion projection 45 is thermally fused to be attached to one surface of the support plate body 31, Through this, the fixed plate 40, the bus bar 20a and the support plate 30 are mutually engaged so that the position of the bus bar 20a can be stably fixed and supported.

On the other hand, the support plate 30 and the fixed plate 40 may be formed in a size corresponding to the cross-sectional area in the stacking direction of the plurality of battery cells 11 stack. Through this, despite the volume of the support plate 30 and the fixed plate 40, it is possible to minimize the unnecessary volume of the battery module 1, the bus in a range that does not hinder the energy density of the battery module 1 The bar 20a and the electrode tab 12 may be fixedly supported.

11A is a view showing the electrical connection state of the battery module 1 according to another embodiment of the present invention from the front, and FIG. 11B is an electrical connection state of the battery module 1 according to another embodiment of the present invention. It is the figure shown from the back side (namely, the secondary battery 10 in the left end of FIG. 11A in the figure is the secondary battery 10 in the right end of FIG. 11B).

11A and 11B, two or more secondary batteries 10 may be connected in parallel through the bus bar 20a to be clustered into one parallel assembly 100, and the parallel assembly 100 may be provided in plural. By being connected in series with each other, the battery module 1 can be formed.

For example, as shown in FIG. 11A of the present specification, when viewed from the front, three (+) poles of the secondary battery 10 are connected in parallel through the bus bar 20a to be formed as one parallel assembly 100a. The parallel aggregates 100a may be arranged in series with the parallel aggregates 100b in which the (-) poles are connected in parallel to each other to be connected in series.

Specifically, four parallel assemblies 100a and 100b of different electrodes are provided based on one direction of the plurality of secondary batteries 10 and may be connected in series through the bus bar 20a. That is, a total of 12 secondary batteries 10 may be interconnected. However, this is not an example and is not limited thereto, and two secondary batteries 10 are connected in parallel with the same electrode to form one parallel assembly 100, and the parallel assembly 100 is provided with a plurality of mutually different electrodes on one side. It is connected in series and may form one battery module 1.

As described above, the battery module 1 according to another embodiment of the present invention can freely select the number of secondary cells 10 constituting one parallel assembly 100, and the number of parallel assemblies 100 to be connected in series is also Freely selectable, it is possible to improve the degree of freedom of configuration of the battery module 1, which can be simply performed by varying the number of holes 23a formed in the bus bar 20a.

In addition, the bus bar 20a according to another embodiment of the present invention may further include a voltage sensing connection 200a formed on at least a portion of the plate 21a. Specifically, the voltage sensing connection unit 200a may be connected to a voltage sensing module (not shown) for measuring the voltage of the parallel assembly 100. In this case, the voltage sensing module may be configured to measure and check the voltage state of the parallel assembly 100 such as a voltage sensing circuit located outside the battery module 1 and a battery management module.

On the other hand, in the process of welding the electrode tab 12 to be described later, the laser may be performed at regular intervals on the end faces of the electrode tab 12, and accordingly, a plurality of electrode tab welding parts 123 may be formed at predetermined intervals. . However, the present invention is not limited thereto, and as shown in FIG. 16(b), which will be described later, the laser may be irradiated continuously to the end face of the electrode tab 12, so that the electrode tab welding part 123 is continuously continuous. It may be formed in a shape.

In addition, although the above-described terminal unit 25a is not shown in the bus bar 20a of FIG. 11, FIG. 11 is for explaining the electrical connection relationship of the plurality of secondary batteries 10, and this is omitted. Terminal portions 25a may be protruded from at least a portion of the bus bars 20a at both ends of the bar 20a.

12 is a view showing a cross-section of a bus bar 20b according to another embodiment of the present invention. Figure 12a is a view showing a cross-section of a bus bar 20b according to another embodiment of the present invention, Figure 12b is an electrode tab (23b) in the hole 23b of the bus bar 20b according to another embodiment of the present invention Fig. 12) is a cross-sectional view.

The protrusion 22b of the bus bar 20b according to another embodiment of the present invention may include a tapered cross-sectional shape. The protrusion 22b is convexly formed from the plate 21b toward the hole 23b, wherein the protrusion 22b may be formed with an inclination. The protruding portion 22b may be formed in a shape that becomes narrower as the cross section of the inner space of the protruding portion 22b approaches the hole 23b. This may function to induce the electrode tab 12 to be inserted into the hole 23b by an inclination when the electrode tab 12 is inserted.

13A and 13B are diagrams illustrating a bus bar 20c according to another embodiment of the present invention.

13A and 13B, the bus bar 20c according to another embodiment of the present invention may include a plate 21c and a hole 23c. The bus bar 20c includes a plurality of holes 23c formed at predetermined intervals in the plate 21c, and corresponds to the number of the battery cells 11 welded to the plate 21c, so that the The size of the area and the like can be determined. The detailed contents related to this are the same as the bus bar 20a according to the embodiment of the present invention described above, and a detailed description thereof will be omitted.

At this time, the plate 21c according to another embodiment of the present invention may include a tab connecting portion 22c. The tab connecting portion 22c is formed by protruding in a direction in which the electrode tab 12 protrudes from the outer periphery of each hole 23c, and then connects to the laser L during electrical connection between the battery cells 11 by laser welding. The electrode tab 12 melted may contact the tab connection portion 22c and be electrically connected to the bus bar 20c.

In addition, as the tab connection portion 22c is formed on the plate 21c, it is possible to minimize reflected light of the laser L when irradiating the laser L for electrical connection between the battery cells 11. Due to this, it is possible to prevent the energy of the laser (L) from being dispersed, and by being able to constantly irradiate the laser (L) of a specific energy during welding, it reduces the process error in the welding process and reduces the battery module (1). Production speed can be improved.

14A is a view showing a cross-section of a bus bar 20c according to another embodiment of the present invention, and FIG. 14B is an electrode tab in a hole 23c of the bus bar 20c according to another embodiment of the present invention. Fig. 12) is a cross-sectional view.

According to FIG. 14B, the battery cell 11 is disposed perpendicular to the ground, and a bus bar 20c may be seated on the electrode tab 12 outside the battery cell 11. Although described herein with reference to the drawings, it will be apparent to those skilled in the art that the battery cells 12 are disposed parallel to the ground and the position of the bus bar 20c may be changed accordingly.

14A and 14B, the depth L ₆ of the hole 23c may be formed corresponding to the length L ₁ of the electrode tab 12, and the electrode inserted at one side of the bus bar 20c The tab 12 may protrude to the other side of the bus bar 20c. At this time, in the welding step to be described later, the laser tab L is irradiated obliquely with respect to the central axis of the length (L ₁ ) direction (d ₁ ) of the electrode tab 12 and the electrode tab 12 without irradiating the bus bar 20c. ), it is preferable that the electrode tab 12 protrudes about 1 mm or more from the outer end of the tab connecting portion 22c, so that it is possible to weld by irradiating only. On the other hand, if the electrode tab 12 protrudes too much, the laser L must be irradiated repeatedly during welding or the electrode tab 12 is not sufficiently melted, so the connection between the electrode tab 12 and the bus bar 20c is not smooth. It may be desirable that the electrode tab 12 protrudes to approximately 3 mm or less.

In addition, a bending portion 121 may be formed on the electrode tab 12. At this time, the bending portion 121 may be formed by bending a predetermined portion of the electrode tab 12. The bending part 121 is not limited to being formed by bending a predetermined part of the electrode tab 12, and a protruding part may be formed at a predetermined part of the electrode tab 12, and other bending parts 121 ) May be formed.

At this time, the detailed content of the bending part 121 is the same as the electrode tab 12 according to another embodiment of the present invention described above, and a detailed description thereof will be omitted.

On the other hand, the electrode tab bending portion 121, the support plate 30, the fixed plate 40 and the parallel assembly 100 connection structure described in this specification is a battery according to another embodiment and another embodiment of the present invention Features common to the module 1, and detailed description is omitted.

On the other hand, according to another embodiment of the present invention, the battery module 1 is a plurality of battery cells 11 are stacked, the electrode tab 12 included in each of the plurality of battery cells 11 is a plurality of holes ( 23c) is inserted from one side of the formed plate 21c and is disposed in at least a portion of the plurality of holes 23c, and a plurality of battery cells 11 can be manufactured by being electrically connected to each other.

At this time, the plurality of battery cells 11 may be electrically connected to each other by laser welding, and as described above, the laser L may be irradiated only to the electrode tab 12. As described above, when welding by welding only the electrode tab 12 without irradiating the bus bar 20c, it can be confirmed that the electrode tab 12 is sufficiently melted and then connected to the bus bar 20c. Accordingly, unlike the conventional method of melting and welding two base materials to be connected, a specific part is connected and a part is not welded, so that the problem can be minimized, and furthermore, the welding state can be visually checked, so that the battery module 1 Can greatly improve the quality and production speed.

Further, the welding may be performed at regular intervals on the end face of the electrode tab 12, and the laser L is irradiated repeatedly in a circular shape, and the center of the circles is the length of the end face of the electrode tab 12 ( L ₅ ) direction (d ₂ ) may be located along the axis 122. As described above, it is possible to uniformly melt the welding portion of the electrode tab 12 through a wobble type welding in which the circles are repeated and overlapped, and in particular, the electrode tab included in the battery cell 11 vulnerable to high heat. In the welding process for 12, it is possible to improve the stability of the manufacturing process of the battery module 1.

Meanwhile, a support plate 30 may be disposed between the plurality of battery cells 11 and the bus bar 20c, and the electrode tab 12 may be positioned through the support hole 32 of the support plate 30. Can be. Specifically, the electrode tab 12 may be disposed in at least a portion of the plurality of holes 23c by being inserted at one side of the plate 21c while passing through the support hole 32 of the support plate 30. .

At this time, the electrode tab 12 may include a bending part 121 formed by bending or bending, and the electrode tab 12 is formed by the bending part 121 being in close contact with one side of the outer circumferential surface of the support hole 32. It can be fixedly supported.

In addition, as shown in FIG. 10 described above, a fixed plate 40 may be disposed on the other side of the bus bar 20a, and the fixed plate 40 and the support plate 30 may be mutually connected to the bus bar 20a. By binding, the position can be fixedly supported.

Specifically, a plurality of insertion protrusions 45 protruding at least a portion of the fixing plate body 41 may be formed on the side of the supporting plate 30 of the fixing plate 40, and at least a portion of the supporting plate body 31 may be formed. A plurality of fastening holes 34 corresponding to the insertion protrusion 45 may be formed in a part. At this time, as described above, the insertion protrusion 45 is inserted into the fastening hole 34 and fused, so that the fixing plate 40 and the support plate 30 can be bound to each other with the bus bar 20a interposed therebetween. , The position of the bus bar 20a may be fixedly supported.

On the other hand, the hole 23a and the projecting portion 22a, which will be described later, can be exposed to the outside through the bus bar exposure hole 42 of the fixing plate 40, and the operator uses the electrode tab 12 and the bus bar 20a. Weld lines can be easily traced between welds.

Details of the support plate 30 and the fixing plate 40 are the same as those of the battery module 1 according to another embodiment of the present invention described above, and thus detailed description thereof will be omitted.

Meanwhile, according to an embodiment of the present invention, a protrusion 22a may be formed at a position where a hole 23a is formed in the plate 21a of the bus bar 20a. Specifically, the protrusion 22a may be formed by decreasing as the width L ₄ of the entry space through which the electrode tab 12 enters at one side of the protrusion 22a approaches the hole 23a, and the electrode described above The insertion of the electrode tab 12 between the holes 23a inserted on the plate 21a of the tab 12 can be facilitated.

Furthermore, according to another embodiment of the present invention, a protrusion 22b may be formed at a position where the hole 23b is formed in the plate 21b of the bus bar 20b. Specifically, the protruding portion 22b may be formed to include a cross-sectional shape tapered toward the hole 23b, and as the entire hole 23b is formed into a tapered cross-sectional shape, the electrode tab 12 is attached to the hole 23b. In the insertion process, it is possible to induce the insertion of the electrode tab 12 to facilitate the insertion.

15 is a cross-sectional view showing a position where laser welding is performed on the protruding electrode tab 12 according to another embodiment of the present invention.

Referring to FIG. 15, in the battery module 1, a plurality of battery cells 11 are stacked, and the electrode tab 12 included in each of the plurality of battery cells 11 is formed with a plurality of holes 23c ( It is inserted from one side of 21c) and disposed to protrude to the other side of the plate 21c in at least a portion of the plurality of holes 23c, and may be manufactured by electrically connecting the plurality of battery cells 11 to each other.

In addition, it may further include a bus bar auxiliary member 24 formed of an insulating material such as plastic. The above-described bus bar auxiliary member 24 may be formed in a form surrounding all other parts except the tab connection part 22c, so that when using the battery module 1, electrical connection with other components around the bus bar 20c is possible Can be blocked in advance.

In addition, the electrode tab 12 may be inserted from one side of the plate 21c on which a plurality of holes 23c are formed and disposed to protrude to the other side of the plate 21c. At this time, the electrode tab 12 may be disposed to protrude 1 to 3 mm from the outer end of the hole 23c as described above.

Meanwhile, the plurality of battery cells 11 may be electrically connected to each other by laser welding, and as described above, the laser L may be irradiated only to the electrode tab 12. As described above, in the case of welding by irradiating only the electrode tab 12 without irradiating the bus bar 20c, a certain part is connected and some are not welded compared to the method of melting and welding two base materials to be connected in the past. The problem can be minimized, and the welding state can be visually checked, thereby greatly improving the quality and production speed of the battery module 1.

16A and 16B are views showing a state in which laser welding is performed on the electrode tab 12 according to another embodiment of the present invention.

16 (a) and (b), welding may be performed at regular intervals on the end faces of the electrode tabs 12, and the enlarged view of FIG. 16 is not performed in a straight line as in the case of conventional laser welding. It is shown that the laser L is irradiated repeatedly and circularly, and that the centers of the circles are positioned along the length (L ₅ ) direction (d ₂ ) axis 122 of the end face of the electrode tab 12. As described above, the welding portion of the electrode tab 12 can be uniformly melted through a wobble type welding in which the circles are repeated and overlapped. In the welding process for the electrode tab 12 included in the cell 11, stability of the manufacturing process of the battery module 1 may be improved.

Meanwhile, the welding is not limited to being performed at regular intervals, and as shown in FIG. 16(b), the laser L may be continuously irradiated to the end face of the electrode tab 12, and accordingly The electrode tab welding part 123 may be formed in a straight continuous shape.

17 (a) and (b) form an angle (θ) with respect to the longitudinal direction (d ₁ ) of the electrode tab 12 according to another embodiment of the present invention and show a state in which the laser L is irradiated It is a drawing.

Referring to Figure 17 (a) and (b), the laser (L) is inserted into the hole (23c) to be irradiated obliquely with respect to the central axis of the length (L ₁ ) direction (d ₁ ) of the protruding electrode tab (12) Can be. Accordingly, if it is irradiated perpendicular to the end face of the electrode tab 12, due to an error in welding, it is possible to minimize the possibility that the laser L is directly irradiated to the battery cell 11 and lead to an accident, In addition, as the laser L is irradiated obliquely, the welding process of the end face of the electrode tab 12 can be visually confirmed, thereby improving the quality and production speed of the battery module 1. However, if necessary, the laser L may be irradiated perpendicular to the end face of the electrode tab 12.

On the other hand, at this time, the laser (L) may be irradiated to the end surface of the electrode tab 12, as shown in Figure 17 (a), but is not limited thereto, depending on the material of the electrode tab 12, Figure 17 As shown in (b), it may be irradiated to one side of the electrode tab 12. Furthermore, it is apparent to a person skilled in the art that it may be irradiated around the bus bar 20c in some cases.

Although the exemplary embodiments of the present invention have been described in detail above, those skilled in the art to which the present invention pertains will understand that various modifications are possible within the limits of the embodiments described above without departing from the scope of the present invention. . Therefore, the scope of rights of the present invention should not be limited to the described embodiments, but should be determined not only by the claims to be described later, but also by the claims and equivalents.

1: Battery module
10: secondary battery
100, 100a, 100b: parallel aggregate
11: battery cell
12: electrode tab
121: bending section
122: longitudinal axis of the tab end face
123: electrode tab weld
124: Terrace
125: insulation
126: electrode tab
127: chamfer
20a, 20b, 20c: Bus bar
21a, 21b, 21c: plate
22a, 22b: protrusion
22c: tap connection
23a, 23b, 23c: Hall
24: bus bar auxiliary member
25a: Terminal
26a: through hole
200a: voltage sensing connection
30: support plate
31: support plate body
32: support hole
33: fixing member insertion groove
34: fastening hole
40: fixed plate
41: fixed plate body
411: fastening projection
42: bus bar exposure hall
43: fixing member
44: terminal support hole
45: insertion protrusion
L ₁ : Length of electrode tab
L ₂ : Hole width
L ₃ : Clearance between hole and electrode tab
L ₄ : Width of the electrode tab entry space
L ₅ : Length of the end face of the electrode tab
L ₆ : Depth of hole
L ₇ : Length of the non-bending portion outside the bending portion of the electrode tab
T ₁ : electrode tab thickness
d ₁ : longitudinal direction of electrode tab
d ₂ : longitudinal direction of the end face of the electrode tab
L: laser
θ: angle

Claims (19)

A plurality of battery cells including electrode tabs;
It includes a bus bar having a plate on which a plurality of holes are formed, and electrically connecting the electrode tabs of the plurality of battery cells.
The electrode tabs,
A bending part formed to be bent;
A battery module comprising a; a straight portion extending from the bending portion and fixedly coupled to the bus bar, which is inserted into the plurality of holes and joined to the inserted plurality of holes. According to claim 1,
The bending portion,
A battery module disposed between the portion where the electrode tab is withdrawn from the battery cell and the bus bar. According to claim 1,
The bending portion,
A battery module configured to contact the bus bar. According to claim 1,
A battery module comprising a; a support plate disposed between the bus bar and the battery cells. The method of claim 4,
The bending module is configured to contact the support plate. The method of claim 5,
The support plate,
It includes; a plurality of support holes corresponding to the plurality of holes;
The battery module of the bending portion is made on the outer peripheral surface of the plurality of support holes. The method of claim 4,
Further comprising a fixed plate disposed on the outside of the bus bar, the fixed plate coupled to the support plate with the bus bar interposed therebetween,
The support plate and the fixed plate,
Each includes a plurality of support holes and a plurality of exposed holes corresponding to the plurality of holes;
The plurality of support holes, and the plurality of exposed holes, the battery module is configured not to interfere with the plurality of holes. The method of claim 7,
The fixed plate,
A battery module configured to cover the bus bar to prevent exposure of the bus bar. According to claim 1,
The plurality of battery cells,
It includes; an electrode assembly to which the electrode tab is connected, and an exterior material configured to surround at least a portion of the electrode assembly and the electrode tab;
The electrode tabs,
A terrace portion configured to be covered by the exterior material;
An insulating portion extending from the terrace portion and wrapped with an insulating material;
A battery module comprising; an electrode tab portion extending from the insulating portion. The method of claim 9,
The bending unit is formed on the insulating portion, and the straight portion is a battery module configured to be formed on the electrode tab portion. The method of claim 9,
The electrode tab portion,
A battery module comprising a; a chamfer portion configured to narrow the width toward the end so that the insertion of the electrode tabs into the plurality of holes is guided. According to claim 1,
The plate includes a protrusion formed around a position where the plurality of holes are formed, a battery module. According to claim 1,
A battery module in which a cross section around the plurality of holes is tapered toward one side of the plate so that the insertion of the electrode tabs into the plurality of holes is induced. Providing a plurality of stacked battery cells having a bending portion and an electrode tab formed with a straight portion extending from the bending portion;
Providing a bus bar having a plate having a plurality of holes is formed;
Inserting the straight portions of the electrode tabs into the plurality of holes;
And bonding the electrode tabs to the plate in the plurality of holes inserted therein. The method of claim 14,
The step of providing the plurality of battery cells,
And forming the bending portion on a predetermined portion of the electrode tab. The method of claim 15,
The predetermined portion,
Method for manufacturing a battery module disposed between the portion where the electrode tab is withdrawn from the battery cell and the bus bar. The method of claim 14,
The bonding step is a battery module manufacturing method made by laser welding. The method of claim 14,
The bonding step is a battery module manufacturing method made by wobble welding. The method of claim 18,
The wobble welding is a method of manufacturing a battery module made along the longitudinal axis of the end faces of the first and second electrode tabs.

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